connection.c 164 KB

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  1. /* Copyright (c) 2001 Matej Pfajfar.
  2. * Copyright (c) 2001-2004, Roger Dingledine.
  3. * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
  4. * Copyright (c) 2007-2013, The Tor Project, Inc. */
  5. /* See LICENSE for licensing information */
  6. /**
  7. * \file connection.c
  8. * \brief General high-level functions to handle reading and writing
  9. * on connections.
  10. **/
  11. #define CONNECTION_PRIVATE
  12. #include "or.h"
  13. #include "buffers.h"
  14. /*
  15. * Define this so we get channel internal functions, since we're implementing
  16. * part of a subclass (channel_tls_t).
  17. */
  18. #define TOR_CHANNEL_INTERNAL_
  19. #define CONNECTION_PRIVATE
  20. #include "channel.h"
  21. #include "channeltls.h"
  22. #include "circuitbuild.h"
  23. #include "circuitlist.h"
  24. #include "circuituse.h"
  25. #include "config.h"
  26. #include "connection.h"
  27. #include "connection_edge.h"
  28. #include "connection_or.h"
  29. #include "control.h"
  30. #include "cpuworker.h"
  31. #include "directory.h"
  32. #include "dirserv.h"
  33. #include "dns.h"
  34. #include "dnsserv.h"
  35. #include "entrynodes.h"
  36. #include "ext_orport.h"
  37. #include "geoip.h"
  38. #include "main.h"
  39. #include "policies.h"
  40. #include "reasons.h"
  41. #include "relay.h"
  42. #include "rendclient.h"
  43. #include "rendcommon.h"
  44. #include "rephist.h"
  45. #include "router.h"
  46. #include "transports.h"
  47. #include "routerparse.h"
  48. #include "transports.h"
  49. #ifdef USE_BUFFEREVENTS
  50. #include <event2/event.h>
  51. #endif
  52. #ifdef HAVE_PWD_H
  53. #include <pwd.h>
  54. #endif
  55. static connection_t *connection_listener_new(
  56. const struct sockaddr *listensockaddr,
  57. socklen_t listensocklen, int type,
  58. const char *address,
  59. const port_cfg_t *portcfg);
  60. static void connection_init(time_t now, connection_t *conn, int type,
  61. int socket_family);
  62. static int connection_init_accepted_conn(connection_t *conn,
  63. const listener_connection_t *listener);
  64. static int connection_handle_listener_read(connection_t *conn, int new_type);
  65. #ifndef USE_BUFFEREVENTS
  66. static int connection_bucket_should_increase(int bucket,
  67. or_connection_t *conn);
  68. #endif
  69. static int connection_finished_flushing(connection_t *conn);
  70. static int connection_flushed_some(connection_t *conn);
  71. static int connection_finished_connecting(connection_t *conn);
  72. static int connection_reached_eof(connection_t *conn);
  73. static int connection_read_to_buf(connection_t *conn, ssize_t *max_to_read,
  74. int *socket_error);
  75. static int connection_process_inbuf(connection_t *conn, int package_partial);
  76. static void client_check_address_changed(tor_socket_t sock);
  77. static void set_constrained_socket_buffers(tor_socket_t sock, int size);
  78. static const char *connection_proxy_state_to_string(int state);
  79. static int connection_read_https_proxy_response(connection_t *conn);
  80. static void connection_send_socks5_connect(connection_t *conn);
  81. static const char *proxy_type_to_string(int proxy_type);
  82. static int get_proxy_type(void);
  83. /** The last addresses that our network interface seemed to have been
  84. * binding to. We use this as one way to detect when our IP changes.
  85. *
  86. * XXX024 We should really use the entire list of interfaces here.
  87. **/
  88. static tor_addr_t *last_interface_ipv4 = NULL;
  89. /* DOCDOC last_interface_ipv6 */
  90. static tor_addr_t *last_interface_ipv6 = NULL;
  91. /** A list of tor_addr_t for addresses we've used in outgoing connections.
  92. * Used to detect IP address changes. */
  93. static smartlist_t *outgoing_addrs = NULL;
  94. #define CASE_ANY_LISTENER_TYPE \
  95. case CONN_TYPE_OR_LISTENER: \
  96. case CONN_TYPE_EXT_OR_LISTENER: \
  97. case CONN_TYPE_AP_LISTENER: \
  98. case CONN_TYPE_DIR_LISTENER: \
  99. case CONN_TYPE_CONTROL_LISTENER: \
  100. case CONN_TYPE_AP_TRANS_LISTENER: \
  101. case CONN_TYPE_AP_NATD_LISTENER: \
  102. case CONN_TYPE_AP_DNS_LISTENER
  103. /**************************************************************/
  104. /**
  105. * Return the human-readable name for the connection type <b>type</b>
  106. */
  107. const char *
  108. conn_type_to_string(int type)
  109. {
  110. static char buf[64];
  111. switch (type) {
  112. case CONN_TYPE_OR_LISTENER: return "OR listener";
  113. case CONN_TYPE_OR: return "OR";
  114. case CONN_TYPE_EXIT: return "Exit";
  115. case CONN_TYPE_AP_LISTENER: return "Socks listener";
  116. case CONN_TYPE_AP_TRANS_LISTENER:
  117. return "Transparent pf/netfilter listener";
  118. case CONN_TYPE_AP_NATD_LISTENER: return "Transparent natd listener";
  119. case CONN_TYPE_AP_DNS_LISTENER: return "DNS listener";
  120. case CONN_TYPE_AP: return "Socks";
  121. case CONN_TYPE_DIR_LISTENER: return "Directory listener";
  122. case CONN_TYPE_DIR: return "Directory";
  123. case CONN_TYPE_CPUWORKER: return "CPU worker";
  124. case CONN_TYPE_CONTROL_LISTENER: return "Control listener";
  125. case CONN_TYPE_CONTROL: return "Control";
  126. case CONN_TYPE_EXT_OR: return "Extended OR";
  127. case CONN_TYPE_EXT_OR_LISTENER: return "Extended OR listener";
  128. default:
  129. log_warn(LD_BUG, "unknown connection type %d", type);
  130. tor_snprintf(buf, sizeof(buf), "unknown [%d]", type);
  131. return buf;
  132. }
  133. }
  134. /**
  135. * Return the human-readable name for the connection state <b>state</b>
  136. * for the connection type <b>type</b>
  137. */
  138. const char *
  139. conn_state_to_string(int type, int state)
  140. {
  141. static char buf[96];
  142. switch (type) {
  143. CASE_ANY_LISTENER_TYPE:
  144. if (state == LISTENER_STATE_READY)
  145. return "ready";
  146. break;
  147. case CONN_TYPE_OR:
  148. switch (state) {
  149. case OR_CONN_STATE_CONNECTING: return "connect()ing";
  150. case OR_CONN_STATE_PROXY_HANDSHAKING: return "handshaking (proxy)";
  151. case OR_CONN_STATE_TLS_HANDSHAKING: return "handshaking (TLS)";
  152. case OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING:
  153. return "renegotiating (TLS, v2 handshake)";
  154. case OR_CONN_STATE_TLS_SERVER_RENEGOTIATING:
  155. return "waiting for renegotiation or V3 handshake";
  156. case OR_CONN_STATE_OR_HANDSHAKING_V2:
  157. return "handshaking (Tor, v2 handshake)";
  158. case OR_CONN_STATE_OR_HANDSHAKING_V3:
  159. return "handshaking (Tor, v3 handshake)";
  160. case OR_CONN_STATE_OPEN: return "open";
  161. }
  162. break;
  163. case CONN_TYPE_EXT_OR:
  164. switch (state) {
  165. case EXT_OR_CONN_STATE_AUTH_WAIT_AUTH_TYPE:
  166. return "waiting for authentication type";
  167. case EXT_OR_CONN_STATE_AUTH_WAIT_CLIENT_NONCE:
  168. return "waiting for client nonce";
  169. case EXT_OR_CONN_STATE_AUTH_WAIT_CLIENT_HASH:
  170. return "waiting for client hash";
  171. case EXT_OR_CONN_STATE_OPEN: return "open";
  172. case EXT_OR_CONN_STATE_FLUSHING: return "flushing final OKAY";
  173. }
  174. break;
  175. case CONN_TYPE_EXIT:
  176. switch (state) {
  177. case EXIT_CONN_STATE_RESOLVING: return "waiting for dest info";
  178. case EXIT_CONN_STATE_CONNECTING: return "connecting";
  179. case EXIT_CONN_STATE_OPEN: return "open";
  180. case EXIT_CONN_STATE_RESOLVEFAILED: return "resolve failed";
  181. }
  182. break;
  183. case CONN_TYPE_AP:
  184. switch (state) {
  185. case AP_CONN_STATE_SOCKS_WAIT: return "waiting for socks info";
  186. case AP_CONN_STATE_NATD_WAIT: return "waiting for natd dest info";
  187. case AP_CONN_STATE_RENDDESC_WAIT: return "waiting for rendezvous desc";
  188. case AP_CONN_STATE_CONTROLLER_WAIT: return "waiting for controller";
  189. case AP_CONN_STATE_CIRCUIT_WAIT: return "waiting for circuit";
  190. case AP_CONN_STATE_CONNECT_WAIT: return "waiting for connect response";
  191. case AP_CONN_STATE_RESOLVE_WAIT: return "waiting for resolve response";
  192. case AP_CONN_STATE_OPEN: return "open";
  193. }
  194. break;
  195. case CONN_TYPE_DIR:
  196. switch (state) {
  197. case DIR_CONN_STATE_CONNECTING: return "connecting";
  198. case DIR_CONN_STATE_CLIENT_SENDING: return "client sending";
  199. case DIR_CONN_STATE_CLIENT_READING: return "client reading";
  200. case DIR_CONN_STATE_CLIENT_FINISHED: return "client finished";
  201. case DIR_CONN_STATE_SERVER_COMMAND_WAIT: return "waiting for command";
  202. case DIR_CONN_STATE_SERVER_WRITING: return "writing";
  203. }
  204. break;
  205. case CONN_TYPE_CPUWORKER:
  206. switch (state) {
  207. case CPUWORKER_STATE_IDLE: return "idle";
  208. case CPUWORKER_STATE_BUSY_ONION: return "busy with onion";
  209. }
  210. break;
  211. case CONN_TYPE_CONTROL:
  212. switch (state) {
  213. case CONTROL_CONN_STATE_OPEN: return "open (protocol v1)";
  214. case CONTROL_CONN_STATE_NEEDAUTH:
  215. return "waiting for authentication (protocol v1)";
  216. }
  217. break;
  218. }
  219. log_warn(LD_BUG, "unknown connection state %d (type %d)", state, type);
  220. tor_snprintf(buf, sizeof(buf),
  221. "unknown state [%d] on unknown [%s] connection",
  222. state, conn_type_to_string(type));
  223. return buf;
  224. }
  225. #ifdef USE_BUFFEREVENTS
  226. /** Return true iff the connection's type is one that can use a
  227. bufferevent-based implementation. */
  228. int
  229. connection_type_uses_bufferevent(connection_t *conn)
  230. {
  231. switch (conn->type) {
  232. case CONN_TYPE_AP:
  233. case CONN_TYPE_EXIT:
  234. case CONN_TYPE_DIR:
  235. case CONN_TYPE_CONTROL:
  236. case CONN_TYPE_OR:
  237. case CONN_TYPE_EXT_OR:
  238. case CONN_TYPE_CPUWORKER:
  239. return 1;
  240. default:
  241. return 0;
  242. }
  243. }
  244. #endif
  245. /** Allocate and return a new dir_connection_t, initialized as by
  246. * connection_init(). */
  247. dir_connection_t *
  248. dir_connection_new(int socket_family)
  249. {
  250. dir_connection_t *dir_conn = tor_malloc_zero(sizeof(dir_connection_t));
  251. connection_init(time(NULL), TO_CONN(dir_conn), CONN_TYPE_DIR, socket_family);
  252. return dir_conn;
  253. }
  254. /** Allocate and return a new or_connection_t, initialized as by
  255. * connection_init().
  256. *
  257. * Initialize active_circuit_pqueue.
  258. *
  259. * Set active_circuit_pqueue_last_recalibrated to current cell_ewma tick.
  260. */
  261. or_connection_t *
  262. or_connection_new(int type, int socket_family)
  263. {
  264. or_connection_t *or_conn = tor_malloc_zero(sizeof(or_connection_t));
  265. time_t now = time(NULL);
  266. tor_assert(type == CONN_TYPE_OR || type == CONN_TYPE_EXT_OR);
  267. connection_init(now, TO_CONN(or_conn), type, socket_family);
  268. connection_or_set_canonical(or_conn, 0);
  269. if (type == CONN_TYPE_EXT_OR)
  270. connection_or_set_ext_or_identifier(or_conn);
  271. return or_conn;
  272. }
  273. /** Allocate and return a new entry_connection_t, initialized as by
  274. * connection_init().
  275. *
  276. * Allocate space to store the socks_request.
  277. */
  278. entry_connection_t *
  279. entry_connection_new(int type, int socket_family)
  280. {
  281. entry_connection_t *entry_conn = tor_malloc_zero(sizeof(entry_connection_t));
  282. tor_assert(type == CONN_TYPE_AP);
  283. connection_init(time(NULL), ENTRY_TO_CONN(entry_conn), type, socket_family);
  284. entry_conn->socks_request = socks_request_new();
  285. /* If this is coming from a listener, we'll set it up based on the listener
  286. * in a little while. Otherwise, we're doing this as a linked connection
  287. * of some kind, and we should set it up here based on the socket family */
  288. if (socket_family == AF_INET)
  289. entry_conn->ipv4_traffic_ok = 1;
  290. else if (socket_family == AF_INET6)
  291. entry_conn->ipv6_traffic_ok = 1;
  292. return entry_conn;
  293. }
  294. /** Allocate and return a new edge_connection_t, initialized as by
  295. * connection_init(). */
  296. edge_connection_t *
  297. edge_connection_new(int type, int socket_family)
  298. {
  299. edge_connection_t *edge_conn = tor_malloc_zero(sizeof(edge_connection_t));
  300. tor_assert(type == CONN_TYPE_EXIT);
  301. connection_init(time(NULL), TO_CONN(edge_conn), type, socket_family);
  302. return edge_conn;
  303. }
  304. /** Allocate and return a new control_connection_t, initialized as by
  305. * connection_init(). */
  306. control_connection_t *
  307. control_connection_new(int socket_family)
  308. {
  309. control_connection_t *control_conn =
  310. tor_malloc_zero(sizeof(control_connection_t));
  311. connection_init(time(NULL),
  312. TO_CONN(control_conn), CONN_TYPE_CONTROL, socket_family);
  313. return control_conn;
  314. }
  315. /** Allocate and return a new listener_connection_t, initialized as by
  316. * connection_init(). */
  317. listener_connection_t *
  318. listener_connection_new(int type, int socket_family)
  319. {
  320. listener_connection_t *listener_conn =
  321. tor_malloc_zero(sizeof(listener_connection_t));
  322. connection_init(time(NULL), TO_CONN(listener_conn), type, socket_family);
  323. return listener_conn;
  324. }
  325. /** Allocate, initialize, and return a new connection_t subtype of <b>type</b>
  326. * to make or receive connections of address family <b>socket_family</b>. The
  327. * type should be one of the CONN_TYPE_* constants. */
  328. connection_t *
  329. connection_new(int type, int socket_family)
  330. {
  331. switch (type) {
  332. case CONN_TYPE_OR:
  333. case CONN_TYPE_EXT_OR:
  334. return TO_CONN(or_connection_new(type, socket_family));
  335. case CONN_TYPE_EXIT:
  336. return TO_CONN(edge_connection_new(type, socket_family));
  337. case CONN_TYPE_AP:
  338. return ENTRY_TO_CONN(entry_connection_new(type, socket_family));
  339. case CONN_TYPE_DIR:
  340. return TO_CONN(dir_connection_new(socket_family));
  341. case CONN_TYPE_CONTROL:
  342. return TO_CONN(control_connection_new(socket_family));
  343. CASE_ANY_LISTENER_TYPE:
  344. return TO_CONN(listener_connection_new(type, socket_family));
  345. default: {
  346. connection_t *conn = tor_malloc_zero(sizeof(connection_t));
  347. connection_init(time(NULL), conn, type, socket_family);
  348. return conn;
  349. }
  350. }
  351. }
  352. /** Initializes conn. (you must call connection_add() to link it into the main
  353. * array).
  354. *
  355. * Set conn-\>magic to the correct value.
  356. *
  357. * Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>conn_array_index to
  358. * -1 to signify they are not yet assigned.
  359. *
  360. * Initialize conn's timestamps to now.
  361. */
  362. static void
  363. connection_init(time_t now, connection_t *conn, int type, int socket_family)
  364. {
  365. static uint64_t n_connections_allocated = 1;
  366. switch (type) {
  367. case CONN_TYPE_OR:
  368. case CONN_TYPE_EXT_OR:
  369. conn->magic = OR_CONNECTION_MAGIC;
  370. break;
  371. case CONN_TYPE_EXIT:
  372. conn->magic = EDGE_CONNECTION_MAGIC;
  373. break;
  374. case CONN_TYPE_AP:
  375. conn->magic = ENTRY_CONNECTION_MAGIC;
  376. break;
  377. case CONN_TYPE_DIR:
  378. conn->magic = DIR_CONNECTION_MAGIC;
  379. break;
  380. case CONN_TYPE_CONTROL:
  381. conn->magic = CONTROL_CONNECTION_MAGIC;
  382. break;
  383. CASE_ANY_LISTENER_TYPE:
  384. conn->magic = LISTENER_CONNECTION_MAGIC;
  385. break;
  386. default:
  387. conn->magic = BASE_CONNECTION_MAGIC;
  388. break;
  389. }
  390. conn->s = TOR_INVALID_SOCKET; /* give it a default of 'not used' */
  391. conn->conn_array_index = -1; /* also default to 'not used' */
  392. conn->global_identifier = n_connections_allocated++;
  393. conn->type = type;
  394. conn->socket_family = socket_family;
  395. #ifndef USE_BUFFEREVENTS
  396. if (!connection_is_listener(conn)) {
  397. /* listeners never use their buf */
  398. conn->inbuf = buf_new();
  399. conn->outbuf = buf_new();
  400. }
  401. #endif
  402. conn->timestamp_created = now;
  403. conn->timestamp_lastread = now;
  404. conn->timestamp_lastwritten = now;
  405. }
  406. /** Create a link between <b>conn_a</b> and <b>conn_b</b>. */
  407. void
  408. connection_link_connections(connection_t *conn_a, connection_t *conn_b)
  409. {
  410. tor_assert(! SOCKET_OK(conn_a->s));
  411. tor_assert(! SOCKET_OK(conn_b->s));
  412. conn_a->linked = 1;
  413. conn_b->linked = 1;
  414. conn_a->linked_conn = conn_b;
  415. conn_b->linked_conn = conn_a;
  416. }
  417. /** Deallocate memory used by <b>conn</b>. Deallocate its buffers if
  418. * necessary, close its socket if necessary, and mark the directory as dirty
  419. * if <b>conn</b> is an OR or OP connection.
  420. */
  421. STATIC void
  422. connection_free_(connection_t *conn)
  423. {
  424. void *mem;
  425. size_t memlen;
  426. if (!conn)
  427. return;
  428. switch (conn->type) {
  429. case CONN_TYPE_OR:
  430. case CONN_TYPE_EXT_OR:
  431. tor_assert(conn->magic == OR_CONNECTION_MAGIC);
  432. mem = TO_OR_CONN(conn);
  433. memlen = sizeof(or_connection_t);
  434. break;
  435. case CONN_TYPE_AP:
  436. tor_assert(conn->magic == ENTRY_CONNECTION_MAGIC);
  437. mem = TO_ENTRY_CONN(conn);
  438. memlen = sizeof(entry_connection_t);
  439. break;
  440. case CONN_TYPE_EXIT:
  441. tor_assert(conn->magic == EDGE_CONNECTION_MAGIC);
  442. mem = TO_EDGE_CONN(conn);
  443. memlen = sizeof(edge_connection_t);
  444. break;
  445. case CONN_TYPE_DIR:
  446. tor_assert(conn->magic == DIR_CONNECTION_MAGIC);
  447. mem = TO_DIR_CONN(conn);
  448. memlen = sizeof(dir_connection_t);
  449. break;
  450. case CONN_TYPE_CONTROL:
  451. tor_assert(conn->magic == CONTROL_CONNECTION_MAGIC);
  452. mem = TO_CONTROL_CONN(conn);
  453. memlen = sizeof(control_connection_t);
  454. break;
  455. CASE_ANY_LISTENER_TYPE:
  456. tor_assert(conn->magic == LISTENER_CONNECTION_MAGIC);
  457. mem = TO_LISTENER_CONN(conn);
  458. memlen = sizeof(listener_connection_t);
  459. break;
  460. default:
  461. tor_assert(conn->magic == BASE_CONNECTION_MAGIC);
  462. mem = conn;
  463. memlen = sizeof(connection_t);
  464. break;
  465. }
  466. if (conn->linked) {
  467. log_info(LD_GENERAL, "Freeing linked %s connection [%s] with %d "
  468. "bytes on inbuf, %d on outbuf.",
  469. conn_type_to_string(conn->type),
  470. conn_state_to_string(conn->type, conn->state),
  471. (int)connection_get_inbuf_len(conn),
  472. (int)connection_get_outbuf_len(conn));
  473. }
  474. if (!connection_is_listener(conn)) {
  475. buf_free(conn->inbuf);
  476. buf_free(conn->outbuf);
  477. } else {
  478. if (conn->socket_family == AF_UNIX) {
  479. /* For now only control ports can be Unix domain sockets
  480. * and listeners at the same time */
  481. tor_assert(conn->type == CONN_TYPE_CONTROL_LISTENER);
  482. if (unlink(conn->address) < 0 && errno != ENOENT) {
  483. log_warn(LD_NET, "Could not unlink %s: %s", conn->address,
  484. strerror(errno));
  485. }
  486. }
  487. }
  488. tor_free(conn->address);
  489. if (connection_speaks_cells(conn)) {
  490. or_connection_t *or_conn = TO_OR_CONN(conn);
  491. tor_tls_free(or_conn->tls);
  492. or_conn->tls = NULL;
  493. or_handshake_state_free(or_conn->handshake_state);
  494. or_conn->handshake_state = NULL;
  495. tor_free(or_conn->nickname);
  496. if (or_conn->chan) {
  497. /* Owww, this shouldn't happen, but... */
  498. log_info(LD_CHANNEL,
  499. "Freeing orconn at %p, saw channel %p with ID "
  500. U64_FORMAT " left un-NULLed",
  501. or_conn, TLS_CHAN_TO_BASE(or_conn->chan),
  502. U64_PRINTF_ARG(
  503. TLS_CHAN_TO_BASE(or_conn->chan)->global_identifier));
  504. if (!(TLS_CHAN_TO_BASE(or_conn->chan)->state == CHANNEL_STATE_CLOSED ||
  505. TLS_CHAN_TO_BASE(or_conn->chan)->state == CHANNEL_STATE_ERROR)) {
  506. channel_close_for_error(TLS_CHAN_TO_BASE(or_conn->chan));
  507. }
  508. or_conn->chan->conn = NULL;
  509. or_conn->chan = NULL;
  510. }
  511. }
  512. if (conn->type == CONN_TYPE_AP) {
  513. entry_connection_t *entry_conn = TO_ENTRY_CONN(conn);
  514. tor_free(entry_conn->chosen_exit_name);
  515. tor_free(entry_conn->original_dest_address);
  516. if (entry_conn->socks_request)
  517. socks_request_free(entry_conn->socks_request);
  518. if (entry_conn->pending_optimistic_data) {
  519. generic_buffer_free(entry_conn->pending_optimistic_data);
  520. }
  521. if (entry_conn->sending_optimistic_data) {
  522. generic_buffer_free(entry_conn->sending_optimistic_data);
  523. }
  524. }
  525. if (CONN_IS_EDGE(conn)) {
  526. rend_data_free(TO_EDGE_CONN(conn)->rend_data);
  527. }
  528. if (conn->type == CONN_TYPE_CONTROL) {
  529. control_connection_t *control_conn = TO_CONTROL_CONN(conn);
  530. tor_free(control_conn->safecookie_client_hash);
  531. tor_free(control_conn->incoming_cmd);
  532. }
  533. tor_free(conn->read_event); /* Probably already freed by connection_free. */
  534. tor_free(conn->write_event); /* Probably already freed by connection_free. */
  535. IF_HAS_BUFFEREVENT(conn, {
  536. /* This was a workaround to handle bugs in some old versions of libevent
  537. * where callbacks can occur after calling bufferevent_free(). Setting
  538. * the callbacks to NULL prevented this. It shouldn't be necessary any
  539. * more, but let's not tempt fate for now. */
  540. bufferevent_setcb(conn->bufev, NULL, NULL, NULL, NULL);
  541. bufferevent_free(conn->bufev);
  542. conn->bufev = NULL;
  543. });
  544. if (conn->type == CONN_TYPE_DIR) {
  545. dir_connection_t *dir_conn = TO_DIR_CONN(conn);
  546. tor_free(dir_conn->requested_resource);
  547. tor_zlib_free(dir_conn->zlib_state);
  548. if (dir_conn->fingerprint_stack) {
  549. SMARTLIST_FOREACH(dir_conn->fingerprint_stack, char *, cp, tor_free(cp));
  550. smartlist_free(dir_conn->fingerprint_stack);
  551. }
  552. cached_dir_decref(dir_conn->cached_dir);
  553. rend_data_free(dir_conn->rend_data);
  554. }
  555. if (SOCKET_OK(conn->s)) {
  556. log_debug(LD_NET,"closing fd %d.",(int)conn->s);
  557. tor_close_socket(conn->s);
  558. conn->s = TOR_INVALID_SOCKET;
  559. }
  560. if (conn->type == CONN_TYPE_OR &&
  561. !tor_digest_is_zero(TO_OR_CONN(conn)->identity_digest)) {
  562. log_warn(LD_BUG, "called on OR conn with non-zeroed identity_digest");
  563. connection_or_remove_from_identity_map(TO_OR_CONN(conn));
  564. }
  565. if (conn->type == CONN_TYPE_OR || conn->type == CONN_TYPE_EXT_OR) {
  566. connection_or_remove_from_ext_or_id_map(TO_OR_CONN(conn));
  567. tor_free(TO_OR_CONN(conn)->ext_or_conn_id);
  568. tor_free(TO_OR_CONN(conn)->ext_or_auth_correct_client_hash);
  569. tor_free(TO_OR_CONN(conn)->ext_or_transport);
  570. }
  571. #ifdef USE_BUFFEREVENTS
  572. if (conn->type == CONN_TYPE_OR && TO_OR_CONN(conn)->bucket_cfg) {
  573. ev_token_bucket_cfg_free(TO_OR_CONN(conn)->bucket_cfg);
  574. TO_OR_CONN(conn)->bucket_cfg = NULL;
  575. }
  576. #endif
  577. memwipe(mem, 0xCC, memlen); /* poison memory */
  578. tor_free(mem);
  579. }
  580. /** Make sure <b>conn</b> isn't in any of the global conn lists; then free it.
  581. */
  582. void
  583. connection_free(connection_t *conn)
  584. {
  585. if (!conn)
  586. return;
  587. tor_assert(!connection_is_on_closeable_list(conn));
  588. tor_assert(!connection_in_array(conn));
  589. if (conn->linked_conn) {
  590. log_err(LD_BUG, "Called with conn->linked_conn still set.");
  591. tor_fragile_assert();
  592. conn->linked_conn->linked_conn = NULL;
  593. if (! conn->linked_conn->marked_for_close &&
  594. conn->linked_conn->reading_from_linked_conn)
  595. connection_start_reading(conn->linked_conn);
  596. conn->linked_conn = NULL;
  597. }
  598. if (connection_speaks_cells(conn)) {
  599. if (!tor_digest_is_zero(TO_OR_CONN(conn)->identity_digest)) {
  600. connection_or_remove_from_identity_map(TO_OR_CONN(conn));
  601. }
  602. }
  603. if (conn->type == CONN_TYPE_CONTROL) {
  604. connection_control_closed(TO_CONTROL_CONN(conn));
  605. }
  606. connection_unregister_events(conn);
  607. connection_free_(conn);
  608. }
  609. /**
  610. * Called when we're about to finally unlink and free a connection:
  611. * perform necessary accounting and cleanup
  612. * - Directory conns that failed to fetch a rendezvous descriptor
  613. * need to inform pending rendezvous streams.
  614. * - OR conns need to call rep_hist_note_*() to record status.
  615. * - AP conns need to send a socks reject if necessary.
  616. * - Exit conns need to call connection_dns_remove() if necessary.
  617. * - AP and Exit conns need to send an end cell if they can.
  618. * - DNS conns need to fail any resolves that are pending on them.
  619. * - OR and edge connections need to be unlinked from circuits.
  620. */
  621. void
  622. connection_about_to_close_connection(connection_t *conn)
  623. {
  624. tor_assert(conn->marked_for_close);
  625. switch (conn->type) {
  626. case CONN_TYPE_DIR:
  627. connection_dir_about_to_close(TO_DIR_CONN(conn));
  628. break;
  629. case CONN_TYPE_OR:
  630. case CONN_TYPE_EXT_OR:
  631. connection_or_about_to_close(TO_OR_CONN(conn));
  632. break;
  633. case CONN_TYPE_AP:
  634. connection_ap_about_to_close(TO_ENTRY_CONN(conn));
  635. break;
  636. case CONN_TYPE_EXIT:
  637. connection_exit_about_to_close(TO_EDGE_CONN(conn));
  638. break;
  639. }
  640. }
  641. /** Return true iff connection_close_immediate() has been called on this
  642. * connection. */
  643. #define CONN_IS_CLOSED(c) \
  644. ((c)->linked ? ((c)->linked_conn_is_closed) : (! SOCKET_OK(c->s)))
  645. /** Close the underlying socket for <b>conn</b>, so we don't try to
  646. * flush it. Must be used in conjunction with (right before)
  647. * connection_mark_for_close().
  648. */
  649. void
  650. connection_close_immediate(connection_t *conn)
  651. {
  652. assert_connection_ok(conn,0);
  653. if (CONN_IS_CLOSED(conn)) {
  654. log_err(LD_BUG,"Attempt to close already-closed connection.");
  655. tor_fragile_assert();
  656. return;
  657. }
  658. if (conn->outbuf_flushlen) {
  659. log_info(LD_NET,"fd %d, type %s, state %s, %d bytes on outbuf.",
  660. (int)conn->s, conn_type_to_string(conn->type),
  661. conn_state_to_string(conn->type, conn->state),
  662. (int)conn->outbuf_flushlen);
  663. }
  664. connection_unregister_events(conn);
  665. if (SOCKET_OK(conn->s))
  666. tor_close_socket(conn->s);
  667. conn->s = TOR_INVALID_SOCKET;
  668. if (conn->linked)
  669. conn->linked_conn_is_closed = 1;
  670. if (conn->outbuf)
  671. buf_clear(conn->outbuf);
  672. conn->outbuf_flushlen = 0;
  673. }
  674. /** Mark <b>conn</b> to be closed next time we loop through
  675. * conn_close_if_marked() in main.c. */
  676. void
  677. connection_mark_for_close_(connection_t *conn, int line, const char *file)
  678. {
  679. assert_connection_ok(conn,0);
  680. tor_assert(line);
  681. tor_assert(line < 1<<16); /* marked_for_close can only fit a uint16_t. */
  682. tor_assert(file);
  683. if (conn->type == CONN_TYPE_OR) {
  684. /*
  685. * An or_connection should have been closed through one of the channel-
  686. * aware functions in connection_or.c. We'll assume this is an error
  687. * close and do that, and log a bug warning.
  688. */
  689. log_warn(LD_CHANNEL | LD_BUG,
  690. "Something tried to close an or_connection_t without going "
  691. "through channels at %s:%d",
  692. file, line);
  693. connection_or_close_for_error(TO_OR_CONN(conn), 0);
  694. } else {
  695. /* Pass it down to the real function */
  696. connection_mark_for_close_internal_(conn, line, file);
  697. }
  698. }
  699. /** Mark <b>conn</b> to be closed next time we loop through
  700. * conn_close_if_marked() in main.c; the _internal version bypasses the
  701. * CONN_TYPE_OR checks; this should be called when you either are sure that
  702. * if this is an or_connection_t the controlling channel has been notified
  703. * (e.g. with connection_or_notify_error()), or you actually are the
  704. * connection_or_close_for_error() or connection_or_close_normally function.
  705. * For all other cases, use connection_mark_and_flush() instead, which
  706. * checks for or_connection_t properly, instead. See below.
  707. */
  708. void
  709. connection_mark_for_close_internal_(connection_t *conn,
  710. int line, const char *file)
  711. {
  712. assert_connection_ok(conn,0);
  713. tor_assert(line);
  714. tor_assert(line < 1<<16); /* marked_for_close can only fit a uint16_t. */
  715. tor_assert(file);
  716. if (conn->marked_for_close) {
  717. log_warn(LD_BUG,"Duplicate call to connection_mark_for_close at %s:%d"
  718. " (first at %s:%d)", file, line, conn->marked_for_close_file,
  719. conn->marked_for_close);
  720. tor_fragile_assert();
  721. return;
  722. }
  723. if (conn->type == CONN_TYPE_OR) {
  724. /*
  725. * Bad news if this happens without telling the controlling channel; do
  726. * this so we can find things that call this wrongly when the asserts hit.
  727. */
  728. log_debug(LD_CHANNEL,
  729. "Calling connection_mark_for_close_internal_() on an OR conn "
  730. "at %s:%d",
  731. file, line);
  732. }
  733. conn->marked_for_close = line;
  734. conn->marked_for_close_file = file;
  735. add_connection_to_closeable_list(conn);
  736. /* in case we're going to be held-open-til-flushed, reset
  737. * the number of seconds since last successful write, so
  738. * we get our whole 15 seconds */
  739. conn->timestamp_lastwritten = time(NULL);
  740. }
  741. /** Find each connection that has hold_open_until_flushed set to
  742. * 1 but hasn't written in the past 15 seconds, and set
  743. * hold_open_until_flushed to 0. This means it will get cleaned
  744. * up in the next loop through close_if_marked() in main.c.
  745. */
  746. void
  747. connection_expire_held_open(void)
  748. {
  749. time_t now;
  750. smartlist_t *conns = get_connection_array();
  751. now = time(NULL);
  752. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
  753. /* If we've been holding the connection open, but we haven't written
  754. * for 15 seconds...
  755. */
  756. if (conn->hold_open_until_flushed) {
  757. tor_assert(conn->marked_for_close);
  758. if (now - conn->timestamp_lastwritten >= 15) {
  759. int severity;
  760. if (conn->type == CONN_TYPE_EXIT ||
  761. (conn->type == CONN_TYPE_DIR &&
  762. conn->purpose == DIR_PURPOSE_SERVER))
  763. severity = LOG_INFO;
  764. else
  765. severity = LOG_NOTICE;
  766. log_fn(severity, LD_NET,
  767. "Giving up on marked_for_close conn that's been flushing "
  768. "for 15s (fd %d, type %s, state %s).",
  769. (int)conn->s, conn_type_to_string(conn->type),
  770. conn_state_to_string(conn->type, conn->state));
  771. conn->hold_open_until_flushed = 0;
  772. }
  773. }
  774. } SMARTLIST_FOREACH_END(conn);
  775. }
  776. #if defined(HAVE_SYS_UN_H) || defined(RUNNING_DOXYGEN)
  777. /** Create an AF_UNIX listenaddr struct.
  778. * <b>listenaddress</b> provides the path to the Unix socket.
  779. *
  780. * Eventually <b>listenaddress</b> will also optionally contain user, group,
  781. * and file permissions for the new socket. But not yet. XXX
  782. * Also, since we do not create the socket here the information doesn't help
  783. * here.
  784. *
  785. * If not NULL <b>readable_address</b> will contain a copy of the path part of
  786. * <b>listenaddress</b>.
  787. *
  788. * The listenaddr struct has to be freed by the caller.
  789. */
  790. static struct sockaddr_un *
  791. create_unix_sockaddr(const char *listenaddress, char **readable_address,
  792. socklen_t *len_out)
  793. {
  794. struct sockaddr_un *sockaddr = NULL;
  795. sockaddr = tor_malloc_zero(sizeof(struct sockaddr_un));
  796. sockaddr->sun_family = AF_UNIX;
  797. if (strlcpy(sockaddr->sun_path, listenaddress, sizeof(sockaddr->sun_path))
  798. >= sizeof(sockaddr->sun_path)) {
  799. log_warn(LD_CONFIG, "Unix socket path '%s' is too long to fit.",
  800. escaped(listenaddress));
  801. tor_free(sockaddr);
  802. return NULL;
  803. }
  804. if (readable_address)
  805. *readable_address = tor_strdup(listenaddress);
  806. *len_out = sizeof(struct sockaddr_un);
  807. return sockaddr;
  808. }
  809. #else
  810. static struct sockaddr *
  811. create_unix_sockaddr(const char *listenaddress, char **readable_address,
  812. socklen_t *len_out)
  813. {
  814. (void)listenaddress;
  815. (void)readable_address;
  816. log_fn(LOG_ERR, LD_BUG,
  817. "Unix domain sockets not supported, yet we tried to create one.");
  818. *len_out = 0;
  819. tor_fragile_assert();
  820. return NULL;
  821. }
  822. #endif /* HAVE_SYS_UN_H */
  823. /** Warn that an accept or a connect has failed because we're running up
  824. * against our ulimit. Rate-limit these warnings so that we don't spam
  825. * the log. */
  826. static void
  827. warn_too_many_conns(void)
  828. {
  829. #define WARN_TOO_MANY_CONNS_INTERVAL (6*60*60)
  830. static ratelim_t last_warned = RATELIM_INIT(WARN_TOO_MANY_CONNS_INTERVAL);
  831. char *m;
  832. if ((m = rate_limit_log(&last_warned, approx_time()))) {
  833. int n_conns = get_n_open_sockets();
  834. log_warn(LD_NET,"Failing because we have %d connections already. Please "
  835. "raise your ulimit -n.%s", n_conns, m);
  836. tor_free(m);
  837. control_event_general_status(LOG_WARN, "TOO_MANY_CONNECTIONS CURRENT=%d",
  838. n_conns);
  839. }
  840. }
  841. #ifdef HAVE_SYS_UN_H
  842. /** Check whether we should be willing to open an AF_UNIX socket in
  843. * <b>path</b>. Return 0 if we should go ahead and -1 if we shouldn't. */
  844. static int
  845. check_location_for_unix_socket(const or_options_t *options, const char *path)
  846. {
  847. int r = -1;
  848. char *p = tor_strdup(path);
  849. cpd_check_t flags = CPD_CHECK_MODE_ONLY;
  850. if (get_parent_directory(p)<0 || p[0] != '/') {
  851. log_warn(LD_GENERAL, "Bad unix socket address '%s'. Tor does not support "
  852. "relative paths for unix sockets.", path);
  853. goto done;
  854. }
  855. if (options->ControlSocketsGroupWritable)
  856. flags |= CPD_GROUP_OK;
  857. if (check_private_dir(p, flags, options->User) < 0) {
  858. char *escpath, *escdir;
  859. escpath = esc_for_log(path);
  860. escdir = esc_for_log(p);
  861. log_warn(LD_GENERAL, "Before Tor can create a control socket in %s, the "
  862. "directory %s needs to exist, and to be accessible only by the "
  863. "user%s account that is running Tor. (On some Unix systems, "
  864. "anybody who can list a socket can connect to it, so Tor is "
  865. "being careful.)", escpath, escdir,
  866. options->ControlSocketsGroupWritable ? " and group" : "");
  867. tor_free(escpath);
  868. tor_free(escdir);
  869. goto done;
  870. }
  871. r = 0;
  872. done:
  873. tor_free(p);
  874. return r;
  875. }
  876. #endif
  877. /** Tell the TCP stack that it shouldn't wait for a long time after
  878. * <b>sock</b> has closed before reusing its port. Return 0 on success,
  879. * -1 on failure. */
  880. static int
  881. make_socket_reuseable(tor_socket_t sock)
  882. {
  883. #ifdef _WIN32
  884. (void) sock;
  885. return 0;
  886. #else
  887. int one=1;
  888. /* REUSEADDR on normal places means you can rebind to the port
  889. * right after somebody else has let it go. But REUSEADDR on win32
  890. * means you can bind to the port _even when somebody else
  891. * already has it bound_. So, don't do that on Win32. */
  892. if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
  893. (socklen_t)sizeof(one)) == -1) {
  894. return -1;
  895. }
  896. return 0;
  897. #endif
  898. }
  899. /** Max backlog to pass to listen. We start at */
  900. static int listen_limit = INT_MAX;
  901. /* Listen on <b>fd</b> with appropriate backlog. Return as for listen. */
  902. static int
  903. tor_listen(tor_socket_t fd)
  904. {
  905. int r;
  906. if ((r = listen(fd, listen_limit)) < 0) {
  907. if (listen_limit == SOMAXCONN)
  908. return r;
  909. if ((r = listen(fd, SOMAXCONN)) == 0) {
  910. listen_limit = SOMAXCONN;
  911. log_warn(LD_NET, "Setting listen backlog to INT_MAX connections "
  912. "didn't work, but SOMAXCONN did. Lowering backlog limit.");
  913. }
  914. }
  915. return r;
  916. }
  917. /** Bind a new non-blocking socket listening to the socket described
  918. * by <b>listensockaddr</b>.
  919. *
  920. * <b>address</b> is only used for logging purposes and to add the information
  921. * to the conn.
  922. */
  923. static connection_t *
  924. connection_listener_new(const struct sockaddr *listensockaddr,
  925. socklen_t socklen,
  926. int type, const char *address,
  927. const port_cfg_t *port_cfg)
  928. {
  929. listener_connection_t *lis_conn;
  930. connection_t *conn = NULL;
  931. tor_socket_t s = TOR_INVALID_SOCKET; /* the socket we're going to make */
  932. or_options_t const *options = get_options();
  933. #if defined(HAVE_PWD_H) && defined(HAVE_SYS_UN_H)
  934. const struct passwd *pw = NULL;
  935. #endif
  936. uint16_t usePort = 0, gotPort = 0;
  937. int start_reading = 0;
  938. static int global_next_session_group = SESSION_GROUP_FIRST_AUTO;
  939. tor_addr_t addr;
  940. if (get_n_open_sockets() >= get_options()->ConnLimit_-1) {
  941. warn_too_many_conns();
  942. return NULL;
  943. }
  944. if (listensockaddr->sa_family == AF_INET ||
  945. listensockaddr->sa_family == AF_INET6) {
  946. int is_tcp = (type != CONN_TYPE_AP_DNS_LISTENER);
  947. if (is_tcp)
  948. start_reading = 1;
  949. tor_addr_from_sockaddr(&addr, listensockaddr, &usePort);
  950. log_notice(LD_NET, "Opening %s on %s",
  951. conn_type_to_string(type), fmt_addrport(&addr, usePort));
  952. s = tor_open_socket_nonblocking(tor_addr_family(&addr),
  953. is_tcp ? SOCK_STREAM : SOCK_DGRAM,
  954. is_tcp ? IPPROTO_TCP: IPPROTO_UDP);
  955. if (!SOCKET_OK(s)) {
  956. log_warn(LD_NET,"Socket creation failed: %s",
  957. tor_socket_strerror(tor_socket_errno(-1)));
  958. goto err;
  959. }
  960. if (make_socket_reuseable(s) < 0) {
  961. log_warn(LD_NET, "Error setting SO_REUSEADDR flag on %s: %s",
  962. conn_type_to_string(type),
  963. tor_socket_strerror(errno));
  964. }
  965. #if defined USE_TRANSPARENT && defined(IP_TRANSPARENT)
  966. if (options->TransProxyType_parsed == TPT_TPROXY &&
  967. type == CONN_TYPE_AP_TRANS_LISTENER) {
  968. int one = 1;
  969. if (setsockopt(s, SOL_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0) {
  970. const char *extra = "";
  971. int e = tor_socket_errno(s);
  972. if (e == EPERM)
  973. extra = "TransTPROXY requires root privileges or similar"
  974. " capabilities.";
  975. log_warn(LD_NET, "Error setting IP_TRANSPARENT flag: %s.%s",
  976. tor_socket_strerror(e), extra);
  977. }
  978. }
  979. #endif
  980. #ifdef IPV6_V6ONLY
  981. if (listensockaddr->sa_family == AF_INET6) {
  982. #ifdef _WIN32
  983. /* In Redmond, this kind of thing passes for standards-conformance. */
  984. DWORD one = 1;
  985. #else
  986. int one = 1;
  987. #endif
  988. /* We need to set IPV6_V6ONLY so that this socket can't get used for
  989. * IPv4 connections. */
  990. if (setsockopt(s,IPPROTO_IPV6, IPV6_V6ONLY,
  991. (void*)&one, sizeof(one)) < 0) {
  992. int e = tor_socket_errno(s);
  993. log_warn(LD_NET, "Error setting IPV6_V6ONLY flag: %s",
  994. tor_socket_strerror(e));
  995. /* Keep going; probably not harmful. */
  996. }
  997. }
  998. #endif
  999. if (bind(s,listensockaddr,socklen) < 0) {
  1000. const char *helpfulhint = "";
  1001. int e = tor_socket_errno(s);
  1002. if (ERRNO_IS_EADDRINUSE(e))
  1003. helpfulhint = ". Is Tor already running?";
  1004. log_warn(LD_NET, "Could not bind to %s:%u: %s%s", address, usePort,
  1005. tor_socket_strerror(e), helpfulhint);
  1006. goto err;
  1007. }
  1008. if (is_tcp) {
  1009. if (tor_listen(s) < 0) {
  1010. log_warn(LD_NET, "Could not listen on %s:%u: %s", address, usePort,
  1011. tor_socket_strerror(tor_socket_errno(s)));
  1012. goto err;
  1013. }
  1014. }
  1015. if (usePort != 0) {
  1016. gotPort = usePort;
  1017. } else {
  1018. tor_addr_t addr2;
  1019. struct sockaddr_storage ss;
  1020. socklen_t ss_len=sizeof(ss);
  1021. if (getsockname(s, (struct sockaddr*)&ss, &ss_len)<0) {
  1022. log_warn(LD_NET, "getsockname() couldn't learn address for %s: %s",
  1023. conn_type_to_string(type),
  1024. tor_socket_strerror(tor_socket_errno(s)));
  1025. gotPort = 0;
  1026. }
  1027. tor_addr_from_sockaddr(&addr2, (struct sockaddr*)&ss, &gotPort);
  1028. }
  1029. #ifdef HAVE_SYS_UN_H
  1030. } else if (listensockaddr->sa_family == AF_UNIX) {
  1031. start_reading = 1;
  1032. /* For now only control ports can be Unix domain sockets
  1033. * and listeners at the same time */
  1034. tor_assert(type == CONN_TYPE_CONTROL_LISTENER);
  1035. if (check_location_for_unix_socket(options, address) < 0)
  1036. goto err;
  1037. log_notice(LD_NET, "Opening %s on %s",
  1038. conn_type_to_string(type), address);
  1039. tor_addr_make_unspec(&addr);
  1040. if (unlink(address) < 0 && errno != ENOENT) {
  1041. log_warn(LD_NET, "Could not unlink %s: %s", address,
  1042. strerror(errno));
  1043. goto err;
  1044. }
  1045. s = tor_open_socket_nonblocking(AF_UNIX, SOCK_STREAM, 0);
  1046. if (! SOCKET_OK(s)) {
  1047. log_warn(LD_NET,"Socket creation failed: %s.", strerror(errno));
  1048. goto err;
  1049. }
  1050. if (bind(s, listensockaddr, (socklen_t)sizeof(struct sockaddr_un)) == -1) {
  1051. log_warn(LD_NET,"Bind to %s failed: %s.", address,
  1052. tor_socket_strerror(tor_socket_errno(s)));
  1053. goto err;
  1054. }
  1055. #ifdef HAVE_PWD_H
  1056. if (options->User) {
  1057. pw = tor_getpwnam(options->User);
  1058. if (pw == NULL) {
  1059. log_warn(LD_NET,"Unable to chown() %s socket: user %s not found.",
  1060. address, options->User);
  1061. goto err;
  1062. } else if (chown(address, pw->pw_uid, pw->pw_gid) < 0) {
  1063. log_warn(LD_NET,"Unable to chown() %s socket: %s.",
  1064. address, strerror(errno));
  1065. goto err;
  1066. }
  1067. }
  1068. #endif
  1069. if (options->ControlSocketsGroupWritable) {
  1070. /* We need to use chmod; fchmod doesn't work on sockets on all
  1071. * platforms. */
  1072. if (chmod(address, 0660) < 0) {
  1073. log_warn(LD_FS,"Unable to make %s group-writable.", address);
  1074. goto err;
  1075. }
  1076. }
  1077. if (listen(s, SOMAXCONN) < 0) {
  1078. log_warn(LD_NET, "Could not listen on %s: %s", address,
  1079. tor_socket_strerror(tor_socket_errno(s)));
  1080. goto err;
  1081. }
  1082. #else
  1083. (void)options;
  1084. #endif /* HAVE_SYS_UN_H */
  1085. } else {
  1086. log_err(LD_BUG, "Got unexpected address family %d.",
  1087. listensockaddr->sa_family);
  1088. tor_assert(0);
  1089. }
  1090. lis_conn = listener_connection_new(type, listensockaddr->sa_family);
  1091. conn = TO_CONN(lis_conn);
  1092. conn->socket_family = listensockaddr->sa_family;
  1093. conn->s = s;
  1094. s = TOR_INVALID_SOCKET; /* Prevent double-close */
  1095. conn->address = tor_strdup(address);
  1096. conn->port = gotPort;
  1097. tor_addr_copy(&conn->addr, &addr);
  1098. if (port_cfg->isolation_flags) {
  1099. lis_conn->isolation_flags = port_cfg->isolation_flags;
  1100. if (port_cfg->session_group >= 0) {
  1101. lis_conn->session_group = port_cfg->session_group;
  1102. } else {
  1103. /* This can wrap after around INT_MAX listeners are opened. But I don't
  1104. * believe that matters, since you would need to open a ridiculous
  1105. * number of listeners while keeping the early ones open before you ever
  1106. * hit this. An OR with a dozen ports open, for example, would have to
  1107. * close and re-open its listeners every second for 4 years nonstop.
  1108. */
  1109. lis_conn->session_group = global_next_session_group--;
  1110. }
  1111. }
  1112. if (type == CONN_TYPE_AP_LISTENER) {
  1113. lis_conn->socks_ipv4_traffic = port_cfg->ipv4_traffic;
  1114. lis_conn->socks_ipv6_traffic = port_cfg->ipv6_traffic;
  1115. lis_conn->socks_prefer_ipv6 = port_cfg->prefer_ipv6;
  1116. } else {
  1117. lis_conn->socks_ipv4_traffic = 1;
  1118. lis_conn->socks_ipv6_traffic = 1;
  1119. }
  1120. lis_conn->cache_ipv4_answers = port_cfg->cache_ipv4_answers;
  1121. lis_conn->cache_ipv6_answers = port_cfg->cache_ipv6_answers;
  1122. lis_conn->use_cached_ipv4_answers = port_cfg->use_cached_ipv4_answers;
  1123. lis_conn->use_cached_ipv6_answers = port_cfg->use_cached_ipv6_answers;
  1124. lis_conn->prefer_ipv6_virtaddr = port_cfg->prefer_ipv6_virtaddr;
  1125. lis_conn->socks_prefer_no_auth = port_cfg->socks_prefer_no_auth;
  1126. if (connection_add(conn) < 0) { /* no space, forget it */
  1127. log_warn(LD_NET,"connection_add for listener failed. Giving up.");
  1128. goto err;
  1129. }
  1130. log_fn(usePort==gotPort ? LOG_DEBUG : LOG_NOTICE, LD_NET,
  1131. "%s listening on port %u.",
  1132. conn_type_to_string(type), gotPort);
  1133. conn->state = LISTENER_STATE_READY;
  1134. if (start_reading) {
  1135. connection_start_reading(conn);
  1136. } else {
  1137. tor_assert(type == CONN_TYPE_AP_DNS_LISTENER);
  1138. dnsserv_configure_listener(conn);
  1139. }
  1140. return conn;
  1141. err:
  1142. if (SOCKET_OK(s))
  1143. tor_close_socket(s);
  1144. if (conn)
  1145. connection_free(conn);
  1146. return NULL;
  1147. }
  1148. /** Do basic sanity checking on a newly received socket. Return 0
  1149. * if it looks ok, else return -1.
  1150. *
  1151. * Notably, some TCP stacks can erroneously have accept() return successfully
  1152. * with socklen 0, when the client sends an RST before the accept call (as
  1153. * nmap does). We want to detect that, and not go on with the connection.
  1154. */
  1155. static int
  1156. check_sockaddr(const struct sockaddr *sa, int len, int level)
  1157. {
  1158. int ok = 1;
  1159. if (sa->sa_family == AF_INET) {
  1160. struct sockaddr_in *sin=(struct sockaddr_in*)sa;
  1161. if (len != sizeof(struct sockaddr_in)) {
  1162. log_fn(level, LD_NET, "Length of address not as expected: %d vs %d",
  1163. len,(int)sizeof(struct sockaddr_in));
  1164. ok = 0;
  1165. }
  1166. if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0) {
  1167. log_fn(level, LD_NET,
  1168. "Address for new connection has address/port equal to zero.");
  1169. ok = 0;
  1170. }
  1171. } else if (sa->sa_family == AF_INET6) {
  1172. struct sockaddr_in6 *sin6=(struct sockaddr_in6*)sa;
  1173. if (len != sizeof(struct sockaddr_in6)) {
  1174. log_fn(level, LD_NET, "Length of address not as expected: %d vs %d",
  1175. len,(int)sizeof(struct sockaddr_in6));
  1176. ok = 0;
  1177. }
  1178. if (tor_mem_is_zero((void*)sin6->sin6_addr.s6_addr, 16) ||
  1179. sin6->sin6_port == 0) {
  1180. log_fn(level, LD_NET,
  1181. "Address for new connection has address/port equal to zero.");
  1182. ok = 0;
  1183. }
  1184. } else {
  1185. ok = 0;
  1186. }
  1187. return ok ? 0 : -1;
  1188. }
  1189. /** Check whether the socket family from an accepted socket <b>got</b> is the
  1190. * same as the one that <b>listener</b> is waiting for. If it isn't, log
  1191. * a useful message and return -1. Else return 0.
  1192. *
  1193. * This is annoying, but can apparently happen on some Darwins. */
  1194. static int
  1195. check_sockaddr_family_match(sa_family_t got, connection_t *listener)
  1196. {
  1197. if (got != listener->socket_family) {
  1198. log_info(LD_BUG, "A listener connection returned a socket with a "
  1199. "mismatched family. %s for addr_family %d gave us a socket "
  1200. "with address family %d. Dropping.",
  1201. conn_type_to_string(listener->type),
  1202. (int)listener->socket_family,
  1203. (int)got);
  1204. return -1;
  1205. }
  1206. return 0;
  1207. }
  1208. /** The listener connection <b>conn</b> told poll() it wanted to read.
  1209. * Call accept() on conn-\>s, and add the new connection if necessary.
  1210. */
  1211. static int
  1212. connection_handle_listener_read(connection_t *conn, int new_type)
  1213. {
  1214. tor_socket_t news; /* the new socket */
  1215. connection_t *newconn;
  1216. /* information about the remote peer when connecting to other routers */
  1217. struct sockaddr_storage addrbuf;
  1218. struct sockaddr *remote = (struct sockaddr*)&addrbuf;
  1219. /* length of the remote address. Must be whatever accept() needs. */
  1220. socklen_t remotelen = (socklen_t)sizeof(addrbuf);
  1221. const or_options_t *options = get_options();
  1222. tor_assert((size_t)remotelen >= sizeof(struct sockaddr_in));
  1223. memset(&addrbuf, 0, sizeof(addrbuf));
  1224. news = tor_accept_socket_nonblocking(conn->s,remote,&remotelen);
  1225. if (!SOCKET_OK(news)) { /* accept() error */
  1226. int e = tor_socket_errno(conn->s);
  1227. if (ERRNO_IS_ACCEPT_EAGAIN(e)) {
  1228. return 0; /* he hung up before we could accept(). that's fine. */
  1229. } else if (ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e)) {
  1230. warn_too_many_conns();
  1231. return 0;
  1232. }
  1233. /* else there was a real error. */
  1234. log_warn(LD_NET,"accept() failed: %s. Closing listener.",
  1235. tor_socket_strerror(e));
  1236. connection_mark_for_close(conn);
  1237. return -1;
  1238. }
  1239. log_debug(LD_NET,
  1240. "Connection accepted on socket %d (child of fd %d).",
  1241. (int)news,(int)conn->s);
  1242. if (make_socket_reuseable(news) < 0) {
  1243. if (tor_socket_errno(news) == EINVAL) {
  1244. /* This can happen on OSX if we get a badly timed shutdown. */
  1245. log_debug(LD_NET, "make_socket_reuseable returned EINVAL");
  1246. } else {
  1247. log_warn(LD_NET, "Error setting SO_REUSEADDR flag on %s: %s",
  1248. conn_type_to_string(new_type),
  1249. tor_socket_strerror(errno));
  1250. }
  1251. tor_close_socket(news);
  1252. return 0;
  1253. }
  1254. if (options->ConstrainedSockets)
  1255. set_constrained_socket_buffers(news, (int)options->ConstrainedSockSize);
  1256. if (check_sockaddr_family_match(remote->sa_family, conn) < 0) {
  1257. tor_close_socket(news);
  1258. return 0;
  1259. }
  1260. if (conn->socket_family == AF_INET || conn->socket_family == AF_INET6) {
  1261. tor_addr_t addr;
  1262. uint16_t port;
  1263. if (check_sockaddr(remote, remotelen, LOG_INFO)<0) {
  1264. log_info(LD_NET,
  1265. "accept() returned a strange address; closing connection.");
  1266. tor_close_socket(news);
  1267. return 0;
  1268. }
  1269. tor_addr_from_sockaddr(&addr, remote, &port);
  1270. /* process entrance policies here, before we even create the connection */
  1271. if (new_type == CONN_TYPE_AP) {
  1272. /* check sockspolicy to see if we should accept it */
  1273. if (socks_policy_permits_address(&addr) == 0) {
  1274. log_notice(LD_APP,
  1275. "Denying socks connection from untrusted address %s.",
  1276. fmt_and_decorate_addr(&addr));
  1277. tor_close_socket(news);
  1278. return 0;
  1279. }
  1280. }
  1281. if (new_type == CONN_TYPE_DIR) {
  1282. /* check dirpolicy to see if we should accept it */
  1283. if (dir_policy_permits_address(&addr) == 0) {
  1284. log_notice(LD_DIRSERV,"Denying dir connection from address %s.",
  1285. fmt_and_decorate_addr(&addr));
  1286. tor_close_socket(news);
  1287. return 0;
  1288. }
  1289. }
  1290. newconn = connection_new(new_type, conn->socket_family);
  1291. newconn->s = news;
  1292. /* remember the remote address */
  1293. tor_addr_copy(&newconn->addr, &addr);
  1294. newconn->port = port;
  1295. newconn->address = tor_dup_addr(&addr);
  1296. if (new_type == CONN_TYPE_AP) {
  1297. TO_ENTRY_CONN(newconn)->socks_request->socks_prefer_no_auth =
  1298. TO_LISTENER_CONN(conn)->socks_prefer_no_auth;
  1299. }
  1300. if (new_type == CONN_TYPE_CONTROL) {
  1301. log_notice(LD_CONTROL, "New control connection opened from %s.",
  1302. fmt_and_decorate_addr(&addr));
  1303. }
  1304. } else if (conn->socket_family == AF_UNIX) {
  1305. /* For now only control ports can be Unix domain sockets
  1306. * and listeners at the same time */
  1307. tor_assert(conn->type == CONN_TYPE_CONTROL_LISTENER);
  1308. tor_assert(new_type == CONN_TYPE_CONTROL);
  1309. log_notice(LD_CONTROL, "New control connection opened.");
  1310. newconn = connection_new(new_type, conn->socket_family);
  1311. newconn->s = news;
  1312. /* remember the remote address -- do we have anything sane to put here? */
  1313. tor_addr_make_unspec(&newconn->addr);
  1314. newconn->port = 1;
  1315. newconn->address = tor_strdup(conn->address);
  1316. } else {
  1317. tor_assert(0);
  1318. };
  1319. if (connection_add(newconn) < 0) { /* no space, forget it */
  1320. connection_free(newconn);
  1321. return 0; /* no need to tear down the parent */
  1322. }
  1323. if (connection_init_accepted_conn(newconn, TO_LISTENER_CONN(conn)) < 0) {
  1324. if (! newconn->marked_for_close)
  1325. connection_mark_for_close(newconn);
  1326. return 0;
  1327. }
  1328. return 0;
  1329. }
  1330. /** Initialize states for newly accepted connection <b>conn</b>.
  1331. * If conn is an OR, start the TLS handshake.
  1332. * If conn is a transparent AP, get its original destination
  1333. * and place it in circuit_wait.
  1334. */
  1335. static int
  1336. connection_init_accepted_conn(connection_t *conn,
  1337. const listener_connection_t *listener)
  1338. {
  1339. int rv;
  1340. connection_start_reading(conn);
  1341. switch (conn->type) {
  1342. case CONN_TYPE_EXT_OR:
  1343. /* Initiate Extended ORPort authentication. */
  1344. return connection_ext_or_start_auth(TO_OR_CONN(conn));
  1345. case CONN_TYPE_OR:
  1346. control_event_or_conn_status(TO_OR_CONN(conn), OR_CONN_EVENT_NEW, 0);
  1347. rv = connection_tls_start_handshake(TO_OR_CONN(conn), 1);
  1348. if (rv < 0) {
  1349. connection_or_close_for_error(TO_OR_CONN(conn), 0);
  1350. }
  1351. return rv;
  1352. break;
  1353. case CONN_TYPE_AP:
  1354. TO_ENTRY_CONN(conn)->isolation_flags = listener->isolation_flags;
  1355. TO_ENTRY_CONN(conn)->session_group = listener->session_group;
  1356. TO_ENTRY_CONN(conn)->nym_epoch = get_signewnym_epoch();
  1357. TO_ENTRY_CONN(conn)->socks_request->listener_type = listener->base_.type;
  1358. TO_ENTRY_CONN(conn)->ipv4_traffic_ok = listener->socks_ipv4_traffic;
  1359. TO_ENTRY_CONN(conn)->ipv6_traffic_ok = listener->socks_ipv6_traffic;
  1360. TO_ENTRY_CONN(conn)->prefer_ipv6_traffic = listener->socks_prefer_ipv6;
  1361. TO_ENTRY_CONN(conn)->cache_ipv4_answers = listener->cache_ipv4_answers;
  1362. TO_ENTRY_CONN(conn)->cache_ipv6_answers = listener->cache_ipv6_answers;
  1363. TO_ENTRY_CONN(conn)->use_cached_ipv4_answers =
  1364. listener->use_cached_ipv4_answers;
  1365. TO_ENTRY_CONN(conn)->use_cached_ipv6_answers =
  1366. listener->use_cached_ipv6_answers;
  1367. TO_ENTRY_CONN(conn)->prefer_ipv6_virtaddr =
  1368. listener->prefer_ipv6_virtaddr;
  1369. switch (TO_CONN(listener)->type) {
  1370. case CONN_TYPE_AP_LISTENER:
  1371. conn->state = AP_CONN_STATE_SOCKS_WAIT;
  1372. break;
  1373. case CONN_TYPE_AP_TRANS_LISTENER:
  1374. TO_ENTRY_CONN(conn)->is_transparent_ap = 1;
  1375. conn->state = AP_CONN_STATE_CIRCUIT_WAIT;
  1376. return connection_ap_process_transparent(TO_ENTRY_CONN(conn));
  1377. case CONN_TYPE_AP_NATD_LISTENER:
  1378. TO_ENTRY_CONN(conn)->is_transparent_ap = 1;
  1379. conn->state = AP_CONN_STATE_NATD_WAIT;
  1380. break;
  1381. }
  1382. break;
  1383. case CONN_TYPE_DIR:
  1384. conn->purpose = DIR_PURPOSE_SERVER;
  1385. conn->state = DIR_CONN_STATE_SERVER_COMMAND_WAIT;
  1386. break;
  1387. case CONN_TYPE_CONTROL:
  1388. conn->state = CONTROL_CONN_STATE_NEEDAUTH;
  1389. break;
  1390. }
  1391. return 0;
  1392. }
  1393. /** Take conn, make a nonblocking socket; try to connect to
  1394. * addr:port (they arrive in *host order*). If fail, return -1 and if
  1395. * applicable put your best guess about errno into *<b>socket_error</b>.
  1396. * Else assign s to conn-\>s: if connected return 1, if EAGAIN return 0.
  1397. *
  1398. * address is used to make the logs useful.
  1399. *
  1400. * On success, add conn to the list of polled connections.
  1401. */
  1402. int
  1403. connection_connect(connection_t *conn, const char *address,
  1404. const tor_addr_t *addr, uint16_t port, int *socket_error)
  1405. {
  1406. tor_socket_t s;
  1407. int inprogress = 0;
  1408. struct sockaddr_storage addrbuf;
  1409. struct sockaddr *dest_addr;
  1410. int dest_addr_len;
  1411. const or_options_t *options = get_options();
  1412. int protocol_family;
  1413. if (get_n_open_sockets() >= get_options()->ConnLimit_-1) {
  1414. warn_too_many_conns();
  1415. *socket_error = SOCK_ERRNO(ENOBUFS);
  1416. return -1;
  1417. }
  1418. if (tor_addr_family(addr) == AF_INET6)
  1419. protocol_family = PF_INET6;
  1420. else
  1421. protocol_family = PF_INET;
  1422. if (get_options()->DisableNetwork) {
  1423. /* We should never even try to connect anyplace if DisableNetwork is set.
  1424. * Warn if we do, and refuse to make the connection. */
  1425. static ratelim_t disablenet_violated = RATELIM_INIT(30*60);
  1426. *socket_error = SOCK_ERRNO(ENETUNREACH);
  1427. log_fn_ratelim(&disablenet_violated, LOG_WARN, LD_BUG,
  1428. "Tried to open a socket with DisableNetwork set.");
  1429. tor_fragile_assert();
  1430. return -1;
  1431. }
  1432. s = tor_open_socket_nonblocking(protocol_family,SOCK_STREAM,IPPROTO_TCP);
  1433. if (! SOCKET_OK(s)) {
  1434. *socket_error = tor_socket_errno(-1);
  1435. log_warn(LD_NET,"Error creating network socket: %s",
  1436. tor_socket_strerror(*socket_error));
  1437. return -1;
  1438. }
  1439. if (make_socket_reuseable(s) < 0) {
  1440. log_warn(LD_NET, "Error setting SO_REUSEADDR flag on new connection: %s",
  1441. tor_socket_strerror(errno));
  1442. }
  1443. if (!tor_addr_is_loopback(addr)) {
  1444. const tor_addr_t *ext_addr = NULL;
  1445. if (protocol_family == AF_INET &&
  1446. !tor_addr_is_null(&options->OutboundBindAddressIPv4_))
  1447. ext_addr = &options->OutboundBindAddressIPv4_;
  1448. else if (protocol_family == AF_INET6 &&
  1449. !tor_addr_is_null(&options->OutboundBindAddressIPv6_))
  1450. ext_addr = &options->OutboundBindAddressIPv6_;
  1451. if (ext_addr) {
  1452. struct sockaddr_storage ext_addr_sa;
  1453. socklen_t ext_addr_len = 0;
  1454. memset(&ext_addr_sa, 0, sizeof(ext_addr_sa));
  1455. ext_addr_len = tor_addr_to_sockaddr(ext_addr, 0,
  1456. (struct sockaddr *) &ext_addr_sa,
  1457. sizeof(ext_addr_sa));
  1458. if (ext_addr_len == 0) {
  1459. log_warn(LD_NET,
  1460. "Error converting OutboundBindAddress %s into sockaddr. "
  1461. "Ignoring.", fmt_and_decorate_addr(ext_addr));
  1462. } else {
  1463. if (bind(s, (struct sockaddr *) &ext_addr_sa, ext_addr_len) < 0) {
  1464. *socket_error = tor_socket_errno(s);
  1465. log_warn(LD_NET,"Error binding network socket to %s: %s",
  1466. fmt_and_decorate_addr(ext_addr),
  1467. tor_socket_strerror(*socket_error));
  1468. tor_close_socket(s);
  1469. return -1;
  1470. }
  1471. }
  1472. }
  1473. }
  1474. tor_assert(options);
  1475. if (options->ConstrainedSockets)
  1476. set_constrained_socket_buffers(s, (int)options->ConstrainedSockSize);
  1477. memset(&addrbuf,0,sizeof(addrbuf));
  1478. dest_addr = (struct sockaddr*) &addrbuf;
  1479. dest_addr_len = tor_addr_to_sockaddr(addr, port, dest_addr, sizeof(addrbuf));
  1480. tor_assert(dest_addr_len > 0);
  1481. log_debug(LD_NET, "Connecting to %s:%u.",
  1482. escaped_safe_str_client(address), port);
  1483. if (connect(s, dest_addr, (socklen_t)dest_addr_len) < 0) {
  1484. int e = tor_socket_errno(s);
  1485. if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
  1486. /* yuck. kill it. */
  1487. *socket_error = e;
  1488. log_info(LD_NET,
  1489. "connect() to %s:%u failed: %s",
  1490. escaped_safe_str_client(address),
  1491. port, tor_socket_strerror(e));
  1492. tor_close_socket(s);
  1493. return -1;
  1494. } else {
  1495. inprogress = 1;
  1496. }
  1497. }
  1498. /* it succeeded. we're connected. */
  1499. log_fn(inprogress?LOG_DEBUG:LOG_INFO, LD_NET,
  1500. "Connection to %s:%u %s (sock "TOR_SOCKET_T_FORMAT").",
  1501. escaped_safe_str_client(address),
  1502. port, inprogress?"in progress":"established", s);
  1503. conn->s = s;
  1504. if (connection_add_connecting(conn) < 0) {
  1505. /* no space, forget it */
  1506. *socket_error = SOCK_ERRNO(ENOBUFS);
  1507. return -1;
  1508. }
  1509. return inprogress ? 0 : 1;
  1510. }
  1511. /** Convert state number to string representation for logging purposes.
  1512. */
  1513. static const char *
  1514. connection_proxy_state_to_string(int state)
  1515. {
  1516. static const char *unknown = "???";
  1517. static const char *states[] = {
  1518. "PROXY_NONE",
  1519. "PROXY_INFANT",
  1520. "PROXY_HTTPS_WANT_CONNECT_OK",
  1521. "PROXY_SOCKS4_WANT_CONNECT_OK",
  1522. "PROXY_SOCKS5_WANT_AUTH_METHOD_NONE",
  1523. "PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929",
  1524. "PROXY_SOCKS5_WANT_AUTH_RFC1929_OK",
  1525. "PROXY_SOCKS5_WANT_CONNECT_OK",
  1526. "PROXY_CONNECTED",
  1527. };
  1528. if (state < PROXY_NONE || state > PROXY_CONNECTED)
  1529. return unknown;
  1530. return states[state];
  1531. }
  1532. /** Returns the global proxy type used by tor. Use this function for
  1533. * logging or high-level purposes, don't use it to fill the
  1534. * <b>proxy_type</b> field of or_connection_t; use the actual proxy
  1535. * protocol instead.*/
  1536. static int
  1537. get_proxy_type(void)
  1538. {
  1539. const or_options_t *options = get_options();
  1540. if (options->ClientTransportPlugin)
  1541. return PROXY_PLUGGABLE;
  1542. else if (options->HTTPSProxy)
  1543. return PROXY_CONNECT;
  1544. else if (options->Socks4Proxy)
  1545. return PROXY_SOCKS4;
  1546. else if (options->Socks5Proxy)
  1547. return PROXY_SOCKS5;
  1548. else
  1549. return PROXY_NONE;
  1550. }
  1551. /* One byte for the version, one for the command, two for the
  1552. port, and four for the addr... and, one more for the
  1553. username NUL: */
  1554. #define SOCKS4_STANDARD_BUFFER_SIZE (1 + 1 + 2 + 4 + 1)
  1555. /** Write a proxy request of <b>type</b> (socks4, socks5, https) to conn
  1556. * for conn->addr:conn->port, authenticating with the auth details given
  1557. * in the configuration (if available). SOCKS 5 and HTTP CONNECT proxies
  1558. * support authentication.
  1559. *
  1560. * Returns -1 if conn->addr is incompatible with the proxy protocol, and
  1561. * 0 otherwise.
  1562. *
  1563. * Use connection_read_proxy_handshake() to complete the handshake.
  1564. */
  1565. int
  1566. connection_proxy_connect(connection_t *conn, int type)
  1567. {
  1568. const or_options_t *options;
  1569. tor_assert(conn);
  1570. options = get_options();
  1571. switch (type) {
  1572. case PROXY_CONNECT: {
  1573. char buf[1024];
  1574. char *base64_authenticator=NULL;
  1575. const char *authenticator = options->HTTPSProxyAuthenticator;
  1576. /* Send HTTP CONNECT and authentication (if available) in
  1577. * one request */
  1578. if (authenticator) {
  1579. base64_authenticator = alloc_http_authenticator(authenticator);
  1580. if (!base64_authenticator)
  1581. log_warn(LD_OR, "Encoding https authenticator failed");
  1582. }
  1583. if (base64_authenticator) {
  1584. const char *addrport = fmt_addrport(&conn->addr, conn->port);
  1585. tor_snprintf(buf, sizeof(buf), "CONNECT %s HTTP/1.1\r\n"
  1586. "Host: %s\r\n"
  1587. "Proxy-Authorization: Basic %s\r\n\r\n",
  1588. addrport,
  1589. addrport,
  1590. base64_authenticator);
  1591. tor_free(base64_authenticator);
  1592. } else {
  1593. tor_snprintf(buf, sizeof(buf), "CONNECT %s HTTP/1.0\r\n\r\n",
  1594. fmt_addrport(&conn->addr, conn->port));
  1595. }
  1596. connection_write_to_buf(buf, strlen(buf), conn);
  1597. conn->proxy_state = PROXY_HTTPS_WANT_CONNECT_OK;
  1598. break;
  1599. }
  1600. case PROXY_SOCKS4: {
  1601. unsigned char *buf;
  1602. uint16_t portn;
  1603. uint32_t ip4addr;
  1604. size_t buf_size = 0;
  1605. char *socks_args_string = NULL;
  1606. /* Send a SOCKS4 connect request */
  1607. if (tor_addr_family(&conn->addr) != AF_INET) {
  1608. log_warn(LD_NET, "SOCKS4 client is incompatible with IPv6");
  1609. return -1;
  1610. }
  1611. { /* If we are here because we are trying to connect to a
  1612. pluggable transport proxy, check if we have any SOCKS
  1613. arguments to transmit. If we do, compress all arguments to
  1614. a single string in 'socks_args_string': */
  1615. if (get_proxy_type() == PROXY_PLUGGABLE) {
  1616. socks_args_string =
  1617. pt_get_socks_args_for_proxy_addrport(&conn->addr, conn->port);
  1618. if (socks_args_string)
  1619. log_debug(LD_NET, "Sending out '%s' as our SOCKS argument string.",
  1620. socks_args_string);
  1621. }
  1622. }
  1623. { /* Figure out the buffer size we need for the SOCKS message: */
  1624. buf_size = SOCKS4_STANDARD_BUFFER_SIZE;
  1625. /* If we have a SOCKS argument string, consider its size when
  1626. calculating the buffer size: */
  1627. if (socks_args_string)
  1628. buf_size += strlen(socks_args_string);
  1629. }
  1630. buf = tor_malloc_zero(buf_size);
  1631. ip4addr = tor_addr_to_ipv4n(&conn->addr);
  1632. portn = htons(conn->port);
  1633. buf[0] = 4; /* version */
  1634. buf[1] = SOCKS_COMMAND_CONNECT; /* command */
  1635. memcpy(buf + 2, &portn, 2); /* port */
  1636. memcpy(buf + 4, &ip4addr, 4); /* addr */
  1637. /* Next packet field is the userid. If we have pluggable
  1638. transport SOCKS arguments, we have to embed them
  1639. there. Otherwise, we use an empty userid. */
  1640. if (socks_args_string) { /* place the SOCKS args string: */
  1641. tor_assert(strlen(socks_args_string) > 0);
  1642. tor_assert(buf_size >=
  1643. SOCKS4_STANDARD_BUFFER_SIZE + strlen(socks_args_string));
  1644. strlcpy((char *)buf + 8, socks_args_string, buf_size - 8);
  1645. tor_free(socks_args_string);
  1646. } else {
  1647. buf[8] = 0; /* no userid */
  1648. }
  1649. connection_write_to_buf((char *)buf, buf_size, conn);
  1650. tor_free(buf);
  1651. conn->proxy_state = PROXY_SOCKS4_WANT_CONNECT_OK;
  1652. break;
  1653. }
  1654. case PROXY_SOCKS5: {
  1655. unsigned char buf[4]; /* fields: vers, num methods, method list */
  1656. /* Send a SOCKS5 greeting (connect request must wait) */
  1657. buf[0] = 5; /* version */
  1658. /* We have to use SOCKS5 authentication, if we have a
  1659. Socks5ProxyUsername or if we want to pass arguments to our
  1660. pluggable transport proxy: */
  1661. if ((options->Socks5ProxyUsername) ||
  1662. (get_proxy_type() == PROXY_PLUGGABLE &&
  1663. (get_socks_args_by_bridge_addrport(&conn->addr, conn->port)))) {
  1664. /* number of auth methods */
  1665. buf[1] = 2;
  1666. buf[2] = 0x00; /* no authentication */
  1667. buf[3] = 0x02; /* rfc1929 Username/Passwd auth */
  1668. conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929;
  1669. } else {
  1670. buf[1] = 1;
  1671. buf[2] = 0x00; /* no authentication */
  1672. conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_METHOD_NONE;
  1673. }
  1674. connection_write_to_buf((char *)buf, 2 + buf[1], conn);
  1675. break;
  1676. }
  1677. default:
  1678. log_err(LD_BUG, "Invalid proxy protocol, %d", type);
  1679. tor_fragile_assert();
  1680. return -1;
  1681. }
  1682. log_debug(LD_NET, "set state %s",
  1683. connection_proxy_state_to_string(conn->proxy_state));
  1684. return 0;
  1685. }
  1686. /** Read conn's inbuf. If the http response from the proxy is all
  1687. * here, make sure it's good news, then return 1. If it's bad news,
  1688. * return -1. Else return 0 and hope for better luck next time.
  1689. */
  1690. static int
  1691. connection_read_https_proxy_response(connection_t *conn)
  1692. {
  1693. char *headers;
  1694. char *reason=NULL;
  1695. int status_code;
  1696. time_t date_header;
  1697. switch (fetch_from_buf_http(conn->inbuf,
  1698. &headers, MAX_HEADERS_SIZE,
  1699. NULL, NULL, 10000, 0)) {
  1700. case -1: /* overflow */
  1701. log_warn(LD_PROTOCOL,
  1702. "Your https proxy sent back an oversized response. Closing.");
  1703. return -1;
  1704. case 0:
  1705. log_info(LD_NET,"https proxy response not all here yet. Waiting.");
  1706. return 0;
  1707. /* case 1, fall through */
  1708. }
  1709. if (parse_http_response(headers, &status_code, &date_header,
  1710. NULL, &reason) < 0) {
  1711. log_warn(LD_NET,
  1712. "Unparseable headers from proxy (connecting to '%s'). Closing.",
  1713. conn->address);
  1714. tor_free(headers);
  1715. return -1;
  1716. }
  1717. tor_free(headers);
  1718. if (!reason) reason = tor_strdup("[no reason given]");
  1719. if (status_code == 200) {
  1720. log_info(LD_NET,
  1721. "HTTPS connect to '%s' successful! (200 %s) Starting TLS.",
  1722. conn->address, escaped(reason));
  1723. tor_free(reason);
  1724. return 1;
  1725. }
  1726. /* else, bad news on the status code */
  1727. switch (status_code) {
  1728. case 403:
  1729. log_warn(LD_NET,
  1730. "The https proxy refused to allow connection to %s "
  1731. "(status code %d, %s). Closing.",
  1732. conn->address, status_code, escaped(reason));
  1733. break;
  1734. default:
  1735. log_warn(LD_NET,
  1736. "The https proxy sent back an unexpected status code %d (%s). "
  1737. "Closing.",
  1738. status_code, escaped(reason));
  1739. break;
  1740. }
  1741. tor_free(reason);
  1742. return -1;
  1743. }
  1744. /** Send SOCKS5 CONNECT command to <b>conn</b>, copying <b>conn->addr</b>
  1745. * and <b>conn->port</b> into the request.
  1746. */
  1747. static void
  1748. connection_send_socks5_connect(connection_t *conn)
  1749. {
  1750. unsigned char buf[1024];
  1751. size_t reqsize = 6;
  1752. uint16_t port = htons(conn->port);
  1753. buf[0] = 5; /* version */
  1754. buf[1] = SOCKS_COMMAND_CONNECT; /* command */
  1755. buf[2] = 0; /* reserved */
  1756. if (tor_addr_family(&conn->addr) == AF_INET) {
  1757. uint32_t addr = tor_addr_to_ipv4n(&conn->addr);
  1758. buf[3] = 1;
  1759. reqsize += 4;
  1760. memcpy(buf + 4, &addr, 4);
  1761. memcpy(buf + 8, &port, 2);
  1762. } else { /* AF_INET6 */
  1763. buf[3] = 4;
  1764. reqsize += 16;
  1765. memcpy(buf + 4, tor_addr_to_in6(&conn->addr), 16);
  1766. memcpy(buf + 20, &port, 2);
  1767. }
  1768. connection_write_to_buf((char *)buf, reqsize, conn);
  1769. conn->proxy_state = PROXY_SOCKS5_WANT_CONNECT_OK;
  1770. }
  1771. /** Wrapper around fetch_from_(buf/evbuffer)_socks_client: see those functions
  1772. * for documentation of its behavior. */
  1773. static int
  1774. connection_fetch_from_buf_socks_client(connection_t *conn,
  1775. int state, char **reason)
  1776. {
  1777. IF_HAS_BUFFEREVENT(conn, {
  1778. struct evbuffer *input = bufferevent_get_input(conn->bufev);
  1779. return fetch_from_evbuffer_socks_client(input, state, reason);
  1780. }) ELSE_IF_NO_BUFFEREVENT {
  1781. return fetch_from_buf_socks_client(conn->inbuf, state, reason);
  1782. }
  1783. }
  1784. /** Call this from connection_*_process_inbuf() to advance the proxy
  1785. * handshake.
  1786. *
  1787. * No matter what proxy protocol is used, if this function returns 1, the
  1788. * handshake is complete, and the data remaining on inbuf may contain the
  1789. * start of the communication with the requested server.
  1790. *
  1791. * Returns 0 if the current buffer contains an incomplete response, and -1
  1792. * on error.
  1793. */
  1794. int
  1795. connection_read_proxy_handshake(connection_t *conn)
  1796. {
  1797. int ret = 0;
  1798. char *reason = NULL;
  1799. log_debug(LD_NET, "enter state %s",
  1800. connection_proxy_state_to_string(conn->proxy_state));
  1801. switch (conn->proxy_state) {
  1802. case PROXY_HTTPS_WANT_CONNECT_OK:
  1803. ret = connection_read_https_proxy_response(conn);
  1804. if (ret == 1)
  1805. conn->proxy_state = PROXY_CONNECTED;
  1806. break;
  1807. case PROXY_SOCKS4_WANT_CONNECT_OK:
  1808. ret = connection_fetch_from_buf_socks_client(conn,
  1809. conn->proxy_state,
  1810. &reason);
  1811. if (ret == 1)
  1812. conn->proxy_state = PROXY_CONNECTED;
  1813. break;
  1814. case PROXY_SOCKS5_WANT_AUTH_METHOD_NONE:
  1815. ret = connection_fetch_from_buf_socks_client(conn,
  1816. conn->proxy_state,
  1817. &reason);
  1818. /* no auth needed, do connect */
  1819. if (ret == 1) {
  1820. connection_send_socks5_connect(conn);
  1821. ret = 0;
  1822. }
  1823. break;
  1824. case PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929:
  1825. ret = connection_fetch_from_buf_socks_client(conn,
  1826. conn->proxy_state,
  1827. &reason);
  1828. /* send auth if needed, otherwise do connect */
  1829. if (ret == 1) {
  1830. connection_send_socks5_connect(conn);
  1831. ret = 0;
  1832. } else if (ret == 2) {
  1833. unsigned char buf[1024];
  1834. size_t reqsize, usize, psize;
  1835. const char *user, *pass;
  1836. char *socks_args_string = NULL;
  1837. if (get_proxy_type() == PROXY_PLUGGABLE) {
  1838. socks_args_string =
  1839. pt_get_socks_args_for_proxy_addrport(&conn->addr, conn->port);
  1840. if (!socks_args_string) {
  1841. log_warn(LD_NET, "Could not create SOCKS args string.");
  1842. ret = -1;
  1843. break;
  1844. }
  1845. log_debug(LD_NET, "SOCKS5 arguments: %s", socks_args_string);
  1846. tor_assert(strlen(socks_args_string) > 0);
  1847. tor_assert(strlen(socks_args_string) <= MAX_SOCKS5_AUTH_SIZE_TOTAL);
  1848. if (strlen(socks_args_string) > MAX_SOCKS5_AUTH_FIELD_SIZE) {
  1849. user = socks_args_string;
  1850. usize = MAX_SOCKS5_AUTH_FIELD_SIZE;
  1851. pass = socks_args_string + MAX_SOCKS5_AUTH_FIELD_SIZE;
  1852. psize = strlen(socks_args_string) - MAX_SOCKS5_AUTH_FIELD_SIZE;
  1853. } else {
  1854. user = socks_args_string;
  1855. usize = strlen(socks_args_string);
  1856. pass = "\0";
  1857. psize = 1;
  1858. }
  1859. } else if (get_options()->Socks5ProxyUsername) {
  1860. user = get_options()->Socks5ProxyUsername;
  1861. pass = get_options()->Socks5ProxyPassword;
  1862. tor_assert(user && pass);
  1863. usize = strlen(user);
  1864. psize = strlen(pass);
  1865. } else {
  1866. log_err(LD_BUG, "We entered %s for no reason!", __func__);
  1867. tor_fragile_assert();
  1868. ret = -1;
  1869. break;
  1870. }
  1871. /* Username and password lengths should have been checked
  1872. above and during torrc parsing. */
  1873. tor_assert(usize <= MAX_SOCKS5_AUTH_FIELD_SIZE &&
  1874. psize <= MAX_SOCKS5_AUTH_FIELD_SIZE);
  1875. reqsize = 3 + usize + psize;
  1876. buf[0] = 1; /* negotiation version */
  1877. buf[1] = usize;
  1878. memcpy(buf + 2, user, usize);
  1879. buf[2 + usize] = psize;
  1880. memcpy(buf + 3 + usize, pass, psize);
  1881. if (socks_args_string)
  1882. tor_free(socks_args_string);
  1883. connection_write_to_buf((char *)buf, reqsize, conn);
  1884. conn->proxy_state = PROXY_SOCKS5_WANT_AUTH_RFC1929_OK;
  1885. ret = 0;
  1886. }
  1887. break;
  1888. case PROXY_SOCKS5_WANT_AUTH_RFC1929_OK:
  1889. ret = connection_fetch_from_buf_socks_client(conn,
  1890. conn->proxy_state,
  1891. &reason);
  1892. /* send the connect request */
  1893. if (ret == 1) {
  1894. connection_send_socks5_connect(conn);
  1895. ret = 0;
  1896. }
  1897. break;
  1898. case PROXY_SOCKS5_WANT_CONNECT_OK:
  1899. ret = connection_fetch_from_buf_socks_client(conn,
  1900. conn->proxy_state,
  1901. &reason);
  1902. if (ret == 1)
  1903. conn->proxy_state = PROXY_CONNECTED;
  1904. break;
  1905. default:
  1906. log_err(LD_BUG, "Invalid proxy_state for reading, %d",
  1907. conn->proxy_state);
  1908. tor_fragile_assert();
  1909. ret = -1;
  1910. break;
  1911. }
  1912. log_debug(LD_NET, "leaving state %s",
  1913. connection_proxy_state_to_string(conn->proxy_state));
  1914. if (ret < 0) {
  1915. if (reason) {
  1916. log_warn(LD_NET, "Proxy Client: unable to connect to %s:%d (%s)",
  1917. conn->address, conn->port, escaped(reason));
  1918. tor_free(reason);
  1919. } else {
  1920. log_warn(LD_NET, "Proxy Client: unable to connect to %s:%d",
  1921. conn->address, conn->port);
  1922. }
  1923. } else if (ret == 1) {
  1924. log_info(LD_NET, "Proxy Client: connection to %s:%d successful",
  1925. conn->address, conn->port);
  1926. }
  1927. return ret;
  1928. }
  1929. /** Given a list of listener connections in <b>old_conns</b>, and list of
  1930. * port_cfg_t entries in <b>ports</b>, open a new listener for every port in
  1931. * <b>ports</b> that does not already have a listener in <b>old_conns</b>.
  1932. *
  1933. * Remove from <b>old_conns</b> every connection that has a corresponding
  1934. * entry in <b>ports</b>. Add to <b>new_conns</b> new every connection we
  1935. * launch.
  1936. *
  1937. * If <b>control_listeners_only</b> is true, then we only open control
  1938. * listeners, and we do not remove any noncontrol listeners from old_conns.
  1939. *
  1940. * Return 0 on success, -1 on failure.
  1941. **/
  1942. static int
  1943. retry_listener_ports(smartlist_t *old_conns,
  1944. const smartlist_t *ports,
  1945. smartlist_t *new_conns,
  1946. int control_listeners_only)
  1947. {
  1948. smartlist_t *launch = smartlist_new();
  1949. int r = 0;
  1950. if (control_listeners_only) {
  1951. SMARTLIST_FOREACH(ports, port_cfg_t *, p, {
  1952. if (p->type == CONN_TYPE_CONTROL_LISTENER)
  1953. smartlist_add(launch, p);
  1954. });
  1955. } else {
  1956. smartlist_add_all(launch, ports);
  1957. }
  1958. /* Iterate through old_conns, comparing it to launch: remove from both lists
  1959. * each pair of elements that corresponds to the same port. */
  1960. SMARTLIST_FOREACH_BEGIN(old_conns, connection_t *, conn) {
  1961. const port_cfg_t *found_port = NULL;
  1962. /* Okay, so this is a listener. Is it configured? */
  1963. SMARTLIST_FOREACH_BEGIN(launch, const port_cfg_t *, wanted) {
  1964. if (conn->type != wanted->type)
  1965. continue;
  1966. if ((conn->socket_family != AF_UNIX && wanted->is_unix_addr) ||
  1967. (conn->socket_family == AF_UNIX && ! wanted->is_unix_addr))
  1968. continue;
  1969. if (wanted->no_listen)
  1970. continue; /* We don't want to open a listener for this one */
  1971. if (wanted->is_unix_addr) {
  1972. if (conn->socket_family == AF_UNIX &&
  1973. !strcmp(wanted->unix_addr, conn->address)) {
  1974. found_port = wanted;
  1975. break;
  1976. }
  1977. } else {
  1978. int port_matches;
  1979. if (wanted->port == CFG_AUTO_PORT) {
  1980. port_matches = 1;
  1981. } else {
  1982. port_matches = (wanted->port == conn->port);
  1983. }
  1984. if (port_matches && tor_addr_eq(&wanted->addr, &conn->addr)) {
  1985. found_port = wanted;
  1986. break;
  1987. }
  1988. }
  1989. } SMARTLIST_FOREACH_END(wanted);
  1990. if (found_port) {
  1991. /* This listener is already running; we don't need to launch it. */
  1992. //log_debug(LD_NET, "Already have %s on %s:%d",
  1993. // conn_type_to_string(found_port->type), conn->address, conn->port);
  1994. smartlist_remove(launch, found_port);
  1995. /* And we can remove the connection from old_conns too. */
  1996. SMARTLIST_DEL_CURRENT(old_conns, conn);
  1997. }
  1998. } SMARTLIST_FOREACH_END(conn);
  1999. /* Now open all the listeners that are configured but not opened. */
  2000. SMARTLIST_FOREACH_BEGIN(launch, const port_cfg_t *, port) {
  2001. struct sockaddr *listensockaddr;
  2002. socklen_t listensocklen = 0;
  2003. char *address=NULL;
  2004. connection_t *conn;
  2005. int real_port = port->port == CFG_AUTO_PORT ? 0 : port->port;
  2006. tor_assert(real_port <= UINT16_MAX);
  2007. if (port->no_listen)
  2008. continue;
  2009. if (port->is_unix_addr) {
  2010. listensockaddr = (struct sockaddr *)
  2011. create_unix_sockaddr(port->unix_addr,
  2012. &address, &listensocklen);
  2013. } else {
  2014. listensockaddr = tor_malloc(sizeof(struct sockaddr_storage));
  2015. listensocklen = tor_addr_to_sockaddr(&port->addr,
  2016. real_port,
  2017. listensockaddr,
  2018. sizeof(struct sockaddr_storage));
  2019. address = tor_dup_addr(&port->addr);
  2020. }
  2021. if (listensockaddr) {
  2022. conn = connection_listener_new(listensockaddr, listensocklen,
  2023. port->type, address, port);
  2024. tor_free(listensockaddr);
  2025. tor_free(address);
  2026. } else {
  2027. conn = NULL;
  2028. }
  2029. if (!conn) {
  2030. r = -1;
  2031. } else {
  2032. if (new_conns)
  2033. smartlist_add(new_conns, conn);
  2034. }
  2035. } SMARTLIST_FOREACH_END(port);
  2036. smartlist_free(launch);
  2037. return r;
  2038. }
  2039. /** Launch listeners for each port you should have open. Only launch
  2040. * listeners who are not already open, and only close listeners we no longer
  2041. * want.
  2042. *
  2043. * Add all old conns that should be closed to <b>replaced_conns</b>.
  2044. * Add all new connections to <b>new_conns</b>.
  2045. *
  2046. * If <b>close_all_noncontrol</b> is true, then we only open control
  2047. * listeners, and we close all other listeners.
  2048. */
  2049. int
  2050. retry_all_listeners(smartlist_t *replaced_conns,
  2051. smartlist_t *new_conns, int close_all_noncontrol)
  2052. {
  2053. smartlist_t *listeners = smartlist_new();
  2054. const or_options_t *options = get_options();
  2055. int retval = 0;
  2056. const uint16_t old_or_port = router_get_advertised_or_port(options);
  2057. const uint16_t old_or_port_ipv6 =
  2058. router_get_advertised_or_port_by_af(options,AF_INET6);
  2059. const uint16_t old_dir_port = router_get_advertised_dir_port(options, 0);
  2060. SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t *, conn) {
  2061. if (connection_is_listener(conn) && !conn->marked_for_close)
  2062. smartlist_add(listeners, conn);
  2063. } SMARTLIST_FOREACH_END(conn);
  2064. if (retry_listener_ports(listeners,
  2065. get_configured_ports(),
  2066. new_conns,
  2067. close_all_noncontrol) < 0)
  2068. retval = -1;
  2069. /* Any members that were still in 'listeners' don't correspond to
  2070. * any configured port. Kill 'em. */
  2071. SMARTLIST_FOREACH_BEGIN(listeners, connection_t *, conn) {
  2072. log_notice(LD_NET, "Closing no-longer-configured %s on %s:%d",
  2073. conn_type_to_string(conn->type), conn->address, conn->port);
  2074. if (replaced_conns) {
  2075. smartlist_add(replaced_conns, conn);
  2076. } else {
  2077. connection_close_immediate(conn);
  2078. connection_mark_for_close(conn);
  2079. }
  2080. } SMARTLIST_FOREACH_END(conn);
  2081. smartlist_free(listeners);
  2082. if (old_or_port != router_get_advertised_or_port(options) ||
  2083. old_or_port_ipv6 != router_get_advertised_or_port_by_af(options,
  2084. AF_INET6) ||
  2085. old_dir_port != router_get_advertised_dir_port(options, 0)) {
  2086. /* Our chosen ORPort or DirPort is not what it used to be: the
  2087. * descriptor we had (if any) should be regenerated. (We won't
  2088. * automatically notice this because of changes in the option,
  2089. * since the value could be "auto".) */
  2090. mark_my_descriptor_dirty("Chosen Or/DirPort changed");
  2091. }
  2092. return retval;
  2093. }
  2094. /** Mark every listener of type other than CONTROL_LISTENER to be closed. */
  2095. void
  2096. connection_mark_all_noncontrol_listeners(void)
  2097. {
  2098. SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t *, conn) {
  2099. if (conn->marked_for_close)
  2100. continue;
  2101. if (conn->type == CONN_TYPE_CONTROL_LISTENER)
  2102. continue;
  2103. if (connection_is_listener(conn))
  2104. connection_mark_for_close(conn);
  2105. } SMARTLIST_FOREACH_END(conn);
  2106. }
  2107. /** Mark every external connection not used for controllers for close. */
  2108. void
  2109. connection_mark_all_noncontrol_connections(void)
  2110. {
  2111. SMARTLIST_FOREACH_BEGIN(get_connection_array(), connection_t *, conn) {
  2112. if (conn->marked_for_close)
  2113. continue;
  2114. switch (conn->type) {
  2115. case CONN_TYPE_CPUWORKER:
  2116. case CONN_TYPE_CONTROL_LISTENER:
  2117. case CONN_TYPE_CONTROL:
  2118. break;
  2119. case CONN_TYPE_AP:
  2120. connection_mark_unattached_ap(TO_ENTRY_CONN(conn),
  2121. END_STREAM_REASON_HIBERNATING);
  2122. break;
  2123. case CONN_TYPE_OR:
  2124. {
  2125. or_connection_t *orconn = TO_OR_CONN(conn);
  2126. if (orconn->chan) {
  2127. connection_or_close_normally(orconn, 0);
  2128. } else {
  2129. /*
  2130. * There should have been one, but mark for close and hope
  2131. * for the best..
  2132. */
  2133. connection_mark_for_close(conn);
  2134. }
  2135. }
  2136. break;
  2137. default:
  2138. connection_mark_for_close(conn);
  2139. break;
  2140. }
  2141. } SMARTLIST_FOREACH_END(conn);
  2142. }
  2143. /** Return 1 if we should apply rate limiting to <b>conn</b>, and 0
  2144. * otherwise.
  2145. * Right now this just checks if it's an internal IP address or an
  2146. * internal connection. We also should, but don't, check if the connection
  2147. * uses pluggable transports, since we should then limit it even if it
  2148. * comes from an internal IP address. */
  2149. static int
  2150. connection_is_rate_limited(connection_t *conn)
  2151. {
  2152. const or_options_t *options = get_options();
  2153. if (conn->linked)
  2154. return 0; /* Internal connection */
  2155. else if (! options->CountPrivateBandwidth &&
  2156. (tor_addr_family(&conn->addr) == AF_UNSPEC || /* no address */
  2157. tor_addr_is_internal(&conn->addr, 0)))
  2158. return 0; /* Internal address */
  2159. else
  2160. return 1;
  2161. }
  2162. #ifdef USE_BUFFEREVENTS
  2163. static struct bufferevent_rate_limit_group *global_rate_limit = NULL;
  2164. #else
  2165. extern int global_read_bucket, global_write_bucket;
  2166. extern int global_relayed_read_bucket, global_relayed_write_bucket;
  2167. /** Did either global write bucket run dry last second? If so,
  2168. * we are likely to run dry again this second, so be stingy with the
  2169. * tokens we just put in. */
  2170. static int write_buckets_empty_last_second = 0;
  2171. #endif
  2172. /** How many seconds of no active local circuits will make the
  2173. * connection revert to the "relayed" bandwidth class? */
  2174. #define CLIENT_IDLE_TIME_FOR_PRIORITY 30
  2175. #ifndef USE_BUFFEREVENTS
  2176. /** Return 1 if <b>conn</b> should use tokens from the "relayed"
  2177. * bandwidth rates, else 0. Currently, only OR conns with bandwidth
  2178. * class 1, and directory conns that are serving data out, count.
  2179. */
  2180. static int
  2181. connection_counts_as_relayed_traffic(connection_t *conn, time_t now)
  2182. {
  2183. if (conn->type == CONN_TYPE_OR &&
  2184. connection_or_client_used(TO_OR_CONN(conn)) +
  2185. CLIENT_IDLE_TIME_FOR_PRIORITY < now)
  2186. return 1;
  2187. if (conn->type == CONN_TYPE_DIR && DIR_CONN_IS_SERVER(conn))
  2188. return 1;
  2189. return 0;
  2190. }
  2191. /** Helper function to decide how many bytes out of <b>global_bucket</b>
  2192. * we're willing to use for this transaction. <b>base</b> is the size
  2193. * of a cell on the network; <b>priority</b> says whether we should
  2194. * write many of them or just a few; and <b>conn_bucket</b> (if
  2195. * non-negative) provides an upper limit for our answer. */
  2196. static ssize_t
  2197. connection_bucket_round_robin(int base, int priority,
  2198. ssize_t global_bucket, ssize_t conn_bucket)
  2199. {
  2200. ssize_t at_most;
  2201. ssize_t num_bytes_high = (priority ? 32 : 16) * base;
  2202. ssize_t num_bytes_low = (priority ? 4 : 2) * base;
  2203. /* Do a rudimentary round-robin so one circuit can't hog a connection.
  2204. * Pick at most 32 cells, at least 4 cells if possible, and if we're in
  2205. * the middle pick 1/8 of the available bandwidth. */
  2206. at_most = global_bucket / 8;
  2207. at_most -= (at_most % base); /* round down */
  2208. if (at_most > num_bytes_high) /* 16 KB, or 8 KB for low-priority */
  2209. at_most = num_bytes_high;
  2210. else if (at_most < num_bytes_low) /* 2 KB, or 1 KB for low-priority */
  2211. at_most = num_bytes_low;
  2212. if (at_most > global_bucket)
  2213. at_most = global_bucket;
  2214. if (conn_bucket >= 0 && at_most > conn_bucket)
  2215. at_most = conn_bucket;
  2216. if (at_most < 0)
  2217. return 0;
  2218. return at_most;
  2219. }
  2220. /** How many bytes at most can we read onto this connection? */
  2221. static ssize_t
  2222. connection_bucket_read_limit(connection_t *conn, time_t now)
  2223. {
  2224. int base = RELAY_PAYLOAD_SIZE;
  2225. int priority = conn->type != CONN_TYPE_DIR;
  2226. int conn_bucket = -1;
  2227. int global_bucket = global_read_bucket;
  2228. if (connection_speaks_cells(conn)) {
  2229. or_connection_t *or_conn = TO_OR_CONN(conn);
  2230. if (conn->state == OR_CONN_STATE_OPEN)
  2231. conn_bucket = or_conn->read_bucket;
  2232. base = get_cell_network_size(or_conn->wide_circ_ids);
  2233. }
  2234. if (!connection_is_rate_limited(conn)) {
  2235. /* be willing to read on local conns even if our buckets are empty */
  2236. return conn_bucket>=0 ? conn_bucket : 1<<14;
  2237. }
  2238. if (connection_counts_as_relayed_traffic(conn, now) &&
  2239. global_relayed_read_bucket <= global_read_bucket)
  2240. global_bucket = global_relayed_read_bucket;
  2241. return connection_bucket_round_robin(base, priority,
  2242. global_bucket, conn_bucket);
  2243. }
  2244. /** How many bytes at most can we write onto this connection? */
  2245. ssize_t
  2246. connection_bucket_write_limit(connection_t *conn, time_t now)
  2247. {
  2248. int base = RELAY_PAYLOAD_SIZE;
  2249. int priority = conn->type != CONN_TYPE_DIR;
  2250. int conn_bucket = (int)conn->outbuf_flushlen;
  2251. int global_bucket = global_write_bucket;
  2252. if (!connection_is_rate_limited(conn)) {
  2253. /* be willing to write to local conns even if our buckets are empty */
  2254. return conn->outbuf_flushlen;
  2255. }
  2256. if (connection_speaks_cells(conn)) {
  2257. /* use the per-conn write limit if it's lower, but if it's less
  2258. * than zero just use zero */
  2259. or_connection_t *or_conn = TO_OR_CONN(conn);
  2260. if (conn->state == OR_CONN_STATE_OPEN)
  2261. if (or_conn->write_bucket < conn_bucket)
  2262. conn_bucket = or_conn->write_bucket >= 0 ?
  2263. or_conn->write_bucket : 0;
  2264. base = get_cell_network_size(or_conn->wide_circ_ids);
  2265. }
  2266. if (connection_counts_as_relayed_traffic(conn, now) &&
  2267. global_relayed_write_bucket <= global_write_bucket)
  2268. global_bucket = global_relayed_write_bucket;
  2269. return connection_bucket_round_robin(base, priority,
  2270. global_bucket, conn_bucket);
  2271. }
  2272. #else
  2273. static ssize_t
  2274. connection_bucket_read_limit(connection_t *conn, time_t now)
  2275. {
  2276. (void) now;
  2277. return bufferevent_get_max_to_read(conn->bufev);
  2278. }
  2279. ssize_t
  2280. connection_bucket_write_limit(connection_t *conn, time_t now)
  2281. {
  2282. (void) now;
  2283. return bufferevent_get_max_to_write(conn->bufev);
  2284. }
  2285. #endif
  2286. /** Return 1 if the global write buckets are low enough that we
  2287. * shouldn't send <b>attempt</b> bytes of low-priority directory stuff
  2288. * out to <b>conn</b>. Else return 0.
  2289. * Priority was 1 for v1 requests (directories and running-routers),
  2290. * and 2 for v2 requests and later (statuses and descriptors).
  2291. *
  2292. * There are a lot of parameters we could use here:
  2293. * - global_relayed_write_bucket. Low is bad.
  2294. * - global_write_bucket. Low is bad.
  2295. * - bandwidthrate. Low is bad.
  2296. * - bandwidthburst. Not a big factor?
  2297. * - attempt. High is bad.
  2298. * - total bytes queued on outbufs. High is bad. But I'm wary of
  2299. * using this, since a few slow-flushing queues will pump up the
  2300. * number without meaning what we meant to mean. What we really
  2301. * mean is "total directory bytes added to outbufs recently", but
  2302. * that's harder to quantify and harder to keep track of.
  2303. */
  2304. int
  2305. global_write_bucket_low(connection_t *conn, size_t attempt, int priority)
  2306. {
  2307. #ifdef USE_BUFFEREVENTS
  2308. ssize_t smaller_bucket = bufferevent_get_max_to_write(conn->bufev);
  2309. #else
  2310. int smaller_bucket = global_write_bucket < global_relayed_write_bucket ?
  2311. global_write_bucket : global_relayed_write_bucket;
  2312. #endif
  2313. if (authdir_mode(get_options()) && priority>1)
  2314. return 0; /* there's always room to answer v2 if we're an auth dir */
  2315. if (!connection_is_rate_limited(conn))
  2316. return 0; /* local conns don't get limited */
  2317. if (smaller_bucket < (int)attempt)
  2318. return 1; /* not enough space no matter the priority */
  2319. #ifndef USE_BUFFEREVENTS
  2320. if (write_buckets_empty_last_second)
  2321. return 1; /* we're already hitting our limits, no more please */
  2322. #endif
  2323. if (priority == 1) { /* old-style v1 query */
  2324. /* Could we handle *two* of these requests within the next two seconds? */
  2325. const or_options_t *options = get_options();
  2326. int64_t can_write = (int64_t)smaller_bucket
  2327. + 2*(options->RelayBandwidthRate ? options->RelayBandwidthRate :
  2328. options->BandwidthRate);
  2329. if (can_write < 2*(int64_t)attempt)
  2330. return 1;
  2331. } else { /* v2 query */
  2332. /* no further constraints yet */
  2333. }
  2334. return 0;
  2335. }
  2336. /** Helper: adjusts our bandwidth history and informs the controller as
  2337. * appropriate, given that we have just read <b>num_read</b> bytes and written
  2338. * <b>num_written</b> bytes on <b>conn</b>. */
  2339. static void
  2340. record_num_bytes_transferred_impl(connection_t *conn,
  2341. time_t now, size_t num_read, size_t num_written)
  2342. {
  2343. /* Count bytes of answering direct and tunneled directory requests */
  2344. if (conn->type == CONN_TYPE_DIR && conn->purpose == DIR_PURPOSE_SERVER) {
  2345. if (num_read > 0)
  2346. rep_hist_note_dir_bytes_read(num_read, now);
  2347. if (num_written > 0)
  2348. rep_hist_note_dir_bytes_written(num_written, now);
  2349. }
  2350. if (!connection_is_rate_limited(conn))
  2351. return; /* local IPs are free */
  2352. if (conn->type == CONN_TYPE_OR)
  2353. rep_hist_note_or_conn_bytes(conn->global_identifier, num_read,
  2354. num_written, now);
  2355. if (num_read > 0) {
  2356. rep_hist_note_bytes_read(num_read, now);
  2357. }
  2358. if (num_written > 0) {
  2359. rep_hist_note_bytes_written(num_written, now);
  2360. }
  2361. if (conn->type == CONN_TYPE_EXIT)
  2362. rep_hist_note_exit_bytes(conn->port, num_written, num_read);
  2363. }
  2364. #ifdef USE_BUFFEREVENTS
  2365. /** Wrapper around fetch_from_(buf/evbuffer)_socks_client: see those functions
  2366. * for documentation of its behavior. */
  2367. static void
  2368. record_num_bytes_transferred(connection_t *conn,
  2369. time_t now, size_t num_read, size_t num_written)
  2370. {
  2371. /* XXX024 check if this is necessary */
  2372. if (num_written >= INT_MAX || num_read >= INT_MAX) {
  2373. log_err(LD_BUG, "Value out of range. num_read=%lu, num_written=%lu, "
  2374. "connection type=%s, state=%s",
  2375. (unsigned long)num_read, (unsigned long)num_written,
  2376. conn_type_to_string(conn->type),
  2377. conn_state_to_string(conn->type, conn->state));
  2378. if (num_written >= INT_MAX) num_written = 1;
  2379. if (num_read >= INT_MAX) num_read = 1;
  2380. tor_fragile_assert();
  2381. }
  2382. record_num_bytes_transferred_impl(conn,now,num_read,num_written);
  2383. }
  2384. #endif
  2385. /** Helper: convert given <b>tvnow</b> time value to milliseconds since
  2386. * midnight. */
  2387. static uint32_t
  2388. msec_since_midnight(const struct timeval *tvnow)
  2389. {
  2390. return (uint32_t)(((tvnow->tv_sec % 86400L) * 1000L) +
  2391. ((uint32_t)tvnow->tv_usec / (uint32_t)1000L));
  2392. }
  2393. /** Helper: return the time in milliseconds since <b>last_empty_time</b>
  2394. * when a bucket ran empty that previously had <b>tokens_before</b> tokens
  2395. * now has <b>tokens_after</b> tokens after refilling at timestamp
  2396. * <b>tvnow</b>, capped at <b>milliseconds_elapsed</b> milliseconds since
  2397. * last refilling that bucket. Return 0 if the bucket has not been empty
  2398. * since the last refill or has not been refilled. */
  2399. uint32_t
  2400. bucket_millis_empty(int tokens_before, uint32_t last_empty_time,
  2401. int tokens_after, int milliseconds_elapsed,
  2402. const struct timeval *tvnow)
  2403. {
  2404. uint32_t result = 0, refilled;
  2405. if (tokens_before <= 0 && tokens_after > tokens_before) {
  2406. refilled = msec_since_midnight(tvnow);
  2407. result = (uint32_t)((refilled + 86400L * 1000L - last_empty_time) %
  2408. (86400L * 1000L));
  2409. if (result > (uint32_t)milliseconds_elapsed)
  2410. result = (uint32_t)milliseconds_elapsed;
  2411. }
  2412. return result;
  2413. }
  2414. /** Check if a bucket which had <b>tokens_before</b> tokens and which got
  2415. * <b>tokens_removed</b> tokens removed at timestamp <b>tvnow</b> has run
  2416. * out of tokens, and if so, note the milliseconds since midnight in
  2417. * <b>timestamp_var</b> for the next TB_EMPTY event. */
  2418. void
  2419. connection_buckets_note_empty_ts(uint32_t *timestamp_var,
  2420. int tokens_before, size_t tokens_removed,
  2421. const struct timeval *tvnow)
  2422. {
  2423. if (tokens_before > 0 && (uint32_t)tokens_before <= tokens_removed)
  2424. *timestamp_var = msec_since_midnight(tvnow);
  2425. }
  2426. #ifndef USE_BUFFEREVENTS
  2427. /** Last time at which the global or relay buckets were emptied in msec
  2428. * since midnight. */
  2429. static uint32_t global_relayed_read_emptied = 0,
  2430. global_relayed_write_emptied = 0,
  2431. global_read_emptied = 0,
  2432. global_write_emptied = 0;
  2433. /** We just read <b>num_read</b> and wrote <b>num_written</b> bytes
  2434. * onto <b>conn</b>. Decrement buckets appropriately. */
  2435. static void
  2436. connection_buckets_decrement(connection_t *conn, time_t now,
  2437. size_t num_read, size_t num_written)
  2438. {
  2439. if (num_written >= INT_MAX || num_read >= INT_MAX) {
  2440. log_err(LD_BUG, "Value out of range. num_read=%lu, num_written=%lu, "
  2441. "connection type=%s, state=%s",
  2442. (unsigned long)num_read, (unsigned long)num_written,
  2443. conn_type_to_string(conn->type),
  2444. conn_state_to_string(conn->type, conn->state));
  2445. if (num_written >= INT_MAX) num_written = 1;
  2446. if (num_read >= INT_MAX) num_read = 1;
  2447. tor_fragile_assert();
  2448. }
  2449. record_num_bytes_transferred_impl(conn, now, num_read, num_written);
  2450. if (!connection_is_rate_limited(conn))
  2451. return; /* local IPs are free */
  2452. /* If one or more of our token buckets ran dry just now, note the
  2453. * timestamp for TB_EMPTY events. */
  2454. if (get_options()->TestingEnableTbEmptyEvent) {
  2455. struct timeval tvnow;
  2456. tor_gettimeofday_cached(&tvnow);
  2457. if (connection_counts_as_relayed_traffic(conn, now)) {
  2458. connection_buckets_note_empty_ts(&global_relayed_read_emptied,
  2459. global_relayed_read_bucket, num_read, &tvnow);
  2460. connection_buckets_note_empty_ts(&global_relayed_write_emptied,
  2461. global_relayed_write_bucket, num_written, &tvnow);
  2462. }
  2463. connection_buckets_note_empty_ts(&global_read_emptied,
  2464. global_read_bucket, num_read, &tvnow);
  2465. connection_buckets_note_empty_ts(&global_write_emptied,
  2466. global_write_bucket, num_written, &tvnow);
  2467. if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
  2468. or_connection_t *or_conn = TO_OR_CONN(conn);
  2469. connection_buckets_note_empty_ts(&or_conn->read_emptied_time,
  2470. or_conn->read_bucket, num_read, &tvnow);
  2471. connection_buckets_note_empty_ts(&or_conn->write_emptied_time,
  2472. or_conn->write_bucket, num_written, &tvnow);
  2473. }
  2474. }
  2475. if (connection_counts_as_relayed_traffic(conn, now)) {
  2476. global_relayed_read_bucket -= (int)num_read;
  2477. global_relayed_write_bucket -= (int)num_written;
  2478. }
  2479. global_read_bucket -= (int)num_read;
  2480. global_write_bucket -= (int)num_written;
  2481. if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
  2482. TO_OR_CONN(conn)->read_bucket -= (int)num_read;
  2483. TO_OR_CONN(conn)->write_bucket -= (int)num_written;
  2484. }
  2485. }
  2486. /** If we have exhausted our global buckets, or the buckets for conn,
  2487. * stop reading. */
  2488. static void
  2489. connection_consider_empty_read_buckets(connection_t *conn)
  2490. {
  2491. const char *reason;
  2492. if (!connection_is_rate_limited(conn))
  2493. return; /* Always okay. */
  2494. if (global_read_bucket <= 0) {
  2495. reason = "global read bucket exhausted. Pausing.";
  2496. } else if (connection_counts_as_relayed_traffic(conn, approx_time()) &&
  2497. global_relayed_read_bucket <= 0) {
  2498. reason = "global relayed read bucket exhausted. Pausing.";
  2499. } else if (connection_speaks_cells(conn) &&
  2500. conn->state == OR_CONN_STATE_OPEN &&
  2501. TO_OR_CONN(conn)->read_bucket <= 0) {
  2502. reason = "connection read bucket exhausted. Pausing.";
  2503. } else
  2504. return; /* all good, no need to stop it */
  2505. LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
  2506. conn->read_blocked_on_bw = 1;
  2507. connection_stop_reading(conn);
  2508. }
  2509. /** If we have exhausted our global buckets, or the buckets for conn,
  2510. * stop writing. */
  2511. static void
  2512. connection_consider_empty_write_buckets(connection_t *conn)
  2513. {
  2514. const char *reason;
  2515. if (!connection_is_rate_limited(conn))
  2516. return; /* Always okay. */
  2517. if (global_write_bucket <= 0) {
  2518. reason = "global write bucket exhausted. Pausing.";
  2519. } else if (connection_counts_as_relayed_traffic(conn, approx_time()) &&
  2520. global_relayed_write_bucket <= 0) {
  2521. reason = "global relayed write bucket exhausted. Pausing.";
  2522. } else if (connection_speaks_cells(conn) &&
  2523. conn->state == OR_CONN_STATE_OPEN &&
  2524. TO_OR_CONN(conn)->write_bucket <= 0) {
  2525. reason = "connection write bucket exhausted. Pausing.";
  2526. } else
  2527. return; /* all good, no need to stop it */
  2528. LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "%s", reason));
  2529. conn->write_blocked_on_bw = 1;
  2530. connection_stop_writing(conn);
  2531. }
  2532. /** Initialize the global read bucket to options-\>BandwidthBurst. */
  2533. void
  2534. connection_bucket_init(void)
  2535. {
  2536. const or_options_t *options = get_options();
  2537. /* start it at max traffic */
  2538. global_read_bucket = (int)options->BandwidthBurst;
  2539. global_write_bucket = (int)options->BandwidthBurst;
  2540. if (options->RelayBandwidthRate) {
  2541. global_relayed_read_bucket = (int)options->RelayBandwidthBurst;
  2542. global_relayed_write_bucket = (int)options->RelayBandwidthBurst;
  2543. } else {
  2544. global_relayed_read_bucket = (int)options->BandwidthBurst;
  2545. global_relayed_write_bucket = (int)options->BandwidthBurst;
  2546. }
  2547. }
  2548. /** Refill a single <b>bucket</b> called <b>name</b> with bandwidth rate per
  2549. * second <b>rate</b> and bandwidth burst <b>burst</b>, assuming that
  2550. * <b>milliseconds_elapsed</b> milliseconds have passed since the last
  2551. * call. */
  2552. static void
  2553. connection_bucket_refill_helper(int *bucket, int rate, int burst,
  2554. int milliseconds_elapsed,
  2555. const char *name)
  2556. {
  2557. int starting_bucket = *bucket;
  2558. if (starting_bucket < burst && milliseconds_elapsed > 0) {
  2559. int64_t incr = (((int64_t)rate) * milliseconds_elapsed) / 1000;
  2560. if ((burst - starting_bucket) < incr) {
  2561. *bucket = burst; /* We would overflow the bucket; just set it to
  2562. * the maximum. */
  2563. } else {
  2564. *bucket += (int)incr;
  2565. if (*bucket > burst || *bucket < starting_bucket) {
  2566. /* If we overflow the burst, or underflow our starting bucket,
  2567. * cap the bucket value to burst. */
  2568. /* XXXX this might be redundant now, but it doesn't show up
  2569. * in profiles. Remove it after analysis. */
  2570. *bucket = burst;
  2571. }
  2572. }
  2573. log_debug(LD_NET,"%s now %d.", name, *bucket);
  2574. }
  2575. }
  2576. /** Time has passed; increment buckets appropriately. */
  2577. void
  2578. connection_bucket_refill(int milliseconds_elapsed, time_t now)
  2579. {
  2580. const or_options_t *options = get_options();
  2581. smartlist_t *conns = get_connection_array();
  2582. int bandwidthrate, bandwidthburst, relayrate, relayburst;
  2583. int prev_global_read = global_read_bucket;
  2584. int prev_global_write = global_write_bucket;
  2585. int prev_relay_read = global_relayed_read_bucket;
  2586. int prev_relay_write = global_relayed_write_bucket;
  2587. struct timeval tvnow; /*< Only used if TB_EMPTY events are enabled. */
  2588. bandwidthrate = (int)options->BandwidthRate;
  2589. bandwidthburst = (int)options->BandwidthBurst;
  2590. if (options->RelayBandwidthRate) {
  2591. relayrate = (int)options->RelayBandwidthRate;
  2592. relayburst = (int)options->RelayBandwidthBurst;
  2593. } else {
  2594. relayrate = bandwidthrate;
  2595. relayburst = bandwidthburst;
  2596. }
  2597. tor_assert(milliseconds_elapsed >= 0);
  2598. write_buckets_empty_last_second =
  2599. global_relayed_write_bucket <= 0 || global_write_bucket <= 0;
  2600. /* refill the global buckets */
  2601. connection_bucket_refill_helper(&global_read_bucket,
  2602. bandwidthrate, bandwidthburst,
  2603. milliseconds_elapsed,
  2604. "global_read_bucket");
  2605. connection_bucket_refill_helper(&global_write_bucket,
  2606. bandwidthrate, bandwidthburst,
  2607. milliseconds_elapsed,
  2608. "global_write_bucket");
  2609. connection_bucket_refill_helper(&global_relayed_read_bucket,
  2610. relayrate, relayburst,
  2611. milliseconds_elapsed,
  2612. "global_relayed_read_bucket");
  2613. connection_bucket_refill_helper(&global_relayed_write_bucket,
  2614. relayrate, relayburst,
  2615. milliseconds_elapsed,
  2616. "global_relayed_write_bucket");
  2617. /* If buckets were empty before and have now been refilled, tell any
  2618. * interested controllers. */
  2619. if (get_options()->TestingEnableTbEmptyEvent) {
  2620. uint32_t global_read_empty_time, global_write_empty_time,
  2621. relay_read_empty_time, relay_write_empty_time;
  2622. tor_gettimeofday_cached(&tvnow);
  2623. global_read_empty_time = bucket_millis_empty(prev_global_read,
  2624. global_read_emptied, global_read_bucket,
  2625. milliseconds_elapsed, &tvnow);
  2626. global_write_empty_time = bucket_millis_empty(prev_global_write,
  2627. global_write_emptied, global_write_bucket,
  2628. milliseconds_elapsed, &tvnow);
  2629. control_event_tb_empty("GLOBAL", global_read_empty_time,
  2630. global_write_empty_time, milliseconds_elapsed);
  2631. relay_read_empty_time = bucket_millis_empty(prev_relay_read,
  2632. global_relayed_read_emptied,
  2633. global_relayed_read_bucket,
  2634. milliseconds_elapsed, &tvnow);
  2635. relay_write_empty_time = bucket_millis_empty(prev_relay_write,
  2636. global_relayed_write_emptied,
  2637. global_relayed_write_bucket,
  2638. milliseconds_elapsed, &tvnow);
  2639. control_event_tb_empty("RELAY", relay_read_empty_time,
  2640. relay_write_empty_time, milliseconds_elapsed);
  2641. }
  2642. /* refill the per-connection buckets */
  2643. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
  2644. if (connection_speaks_cells(conn)) {
  2645. or_connection_t *or_conn = TO_OR_CONN(conn);
  2646. int orbandwidthrate = or_conn->bandwidthrate;
  2647. int orbandwidthburst = or_conn->bandwidthburst;
  2648. int prev_conn_read = or_conn->read_bucket;
  2649. int prev_conn_write = or_conn->write_bucket;
  2650. if (connection_bucket_should_increase(or_conn->read_bucket, or_conn)) {
  2651. connection_bucket_refill_helper(&or_conn->read_bucket,
  2652. orbandwidthrate,
  2653. orbandwidthburst,
  2654. milliseconds_elapsed,
  2655. "or_conn->read_bucket");
  2656. }
  2657. if (connection_bucket_should_increase(or_conn->write_bucket, or_conn)) {
  2658. connection_bucket_refill_helper(&or_conn->write_bucket,
  2659. orbandwidthrate,
  2660. orbandwidthburst,
  2661. milliseconds_elapsed,
  2662. "or_conn->write_bucket");
  2663. }
  2664. /* If buckets were empty before and have now been refilled, tell any
  2665. * interested controllers. */
  2666. if (get_options()->TestingEnableTbEmptyEvent) {
  2667. char *bucket;
  2668. uint32_t conn_read_empty_time, conn_write_empty_time;
  2669. tor_asprintf(&bucket, "ORCONN ID="U64_FORMAT,
  2670. U64_PRINTF_ARG(or_conn->base_.global_identifier));
  2671. conn_read_empty_time = bucket_millis_empty(prev_conn_read,
  2672. or_conn->read_emptied_time,
  2673. or_conn->read_bucket,
  2674. milliseconds_elapsed, &tvnow);
  2675. conn_write_empty_time = bucket_millis_empty(prev_conn_write,
  2676. or_conn->write_emptied_time,
  2677. or_conn->write_bucket,
  2678. milliseconds_elapsed, &tvnow);
  2679. control_event_tb_empty(bucket, conn_read_empty_time,
  2680. conn_write_empty_time,
  2681. milliseconds_elapsed);
  2682. tor_free(bucket);
  2683. }
  2684. }
  2685. if (conn->read_blocked_on_bw == 1 /* marked to turn reading back on now */
  2686. && global_read_bucket > 0 /* and we're allowed to read */
  2687. && (!connection_counts_as_relayed_traffic(conn, now) ||
  2688. global_relayed_read_bucket > 0) /* even if we're relayed traffic */
  2689. && (!connection_speaks_cells(conn) ||
  2690. conn->state != OR_CONN_STATE_OPEN ||
  2691. TO_OR_CONN(conn)->read_bucket > 0)) {
  2692. /* and either a non-cell conn or a cell conn with non-empty bucket */
  2693. LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
  2694. "waking up conn (fd %d) for read", (int)conn->s));
  2695. conn->read_blocked_on_bw = 0;
  2696. connection_start_reading(conn);
  2697. }
  2698. if (conn->write_blocked_on_bw == 1
  2699. && global_write_bucket > 0 /* and we're allowed to write */
  2700. && (!connection_counts_as_relayed_traffic(conn, now) ||
  2701. global_relayed_write_bucket > 0) /* even if it's relayed traffic */
  2702. && (!connection_speaks_cells(conn) ||
  2703. conn->state != OR_CONN_STATE_OPEN ||
  2704. TO_OR_CONN(conn)->write_bucket > 0)) {
  2705. LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,
  2706. "waking up conn (fd %d) for write", (int)conn->s));
  2707. conn->write_blocked_on_bw = 0;
  2708. connection_start_writing(conn);
  2709. }
  2710. } SMARTLIST_FOREACH_END(conn);
  2711. }
  2712. /** Is the <b>bucket</b> for connection <b>conn</b> low enough that we
  2713. * should add another pile of tokens to it?
  2714. */
  2715. static int
  2716. connection_bucket_should_increase(int bucket, or_connection_t *conn)
  2717. {
  2718. tor_assert(conn);
  2719. if (conn->base_.state != OR_CONN_STATE_OPEN)
  2720. return 0; /* only open connections play the rate limiting game */
  2721. if (bucket >= conn->bandwidthburst)
  2722. return 0;
  2723. return 1;
  2724. }
  2725. #else
  2726. static void
  2727. connection_buckets_decrement(connection_t *conn, time_t now,
  2728. size_t num_read, size_t num_written)
  2729. {
  2730. (void) conn;
  2731. (void) now;
  2732. (void) num_read;
  2733. (void) num_written;
  2734. /* Libevent does this for us. */
  2735. }
  2736. void
  2737. connection_bucket_refill(int seconds_elapsed, time_t now)
  2738. {
  2739. (void) seconds_elapsed;
  2740. (void) now;
  2741. /* Libevent does this for us. */
  2742. }
  2743. void
  2744. connection_bucket_init(void)
  2745. {
  2746. const or_options_t *options = get_options();
  2747. const struct timeval *tick = tor_libevent_get_one_tick_timeout();
  2748. struct ev_token_bucket_cfg *bucket_cfg;
  2749. uint64_t rate, burst;
  2750. if (options->RelayBandwidthRate) {
  2751. rate = options->RelayBandwidthRate;
  2752. burst = options->RelayBandwidthBurst;
  2753. } else {
  2754. rate = options->BandwidthRate;
  2755. burst = options->BandwidthBurst;
  2756. }
  2757. /* This can't overflow, since TokenBucketRefillInterval <= 1000,
  2758. * and rate started out less than INT32_MAX. */
  2759. rate = (rate * options->TokenBucketRefillInterval) / 1000;
  2760. bucket_cfg = ev_token_bucket_cfg_new((uint32_t)rate, (uint32_t)burst,
  2761. (uint32_t)rate, (uint32_t)burst,
  2762. tick);
  2763. if (!global_rate_limit) {
  2764. global_rate_limit =
  2765. bufferevent_rate_limit_group_new(tor_libevent_get_base(), bucket_cfg);
  2766. } else {
  2767. bufferevent_rate_limit_group_set_cfg(global_rate_limit, bucket_cfg);
  2768. }
  2769. ev_token_bucket_cfg_free(bucket_cfg);
  2770. }
  2771. void
  2772. connection_get_rate_limit_totals(uint64_t *read_out, uint64_t *written_out)
  2773. {
  2774. if (global_rate_limit == NULL) {
  2775. *read_out = *written_out = 0;
  2776. } else {
  2777. bufferevent_rate_limit_group_get_totals(
  2778. global_rate_limit, read_out, written_out);
  2779. }
  2780. }
  2781. /** Perform whatever operations are needed on <b>conn</b> to enable
  2782. * rate-limiting. */
  2783. void
  2784. connection_enable_rate_limiting(connection_t *conn)
  2785. {
  2786. if (conn->bufev) {
  2787. if (!global_rate_limit)
  2788. connection_bucket_init();
  2789. tor_add_bufferevent_to_rate_limit_group(conn->bufev, global_rate_limit);
  2790. }
  2791. }
  2792. static void
  2793. connection_consider_empty_write_buckets(connection_t *conn)
  2794. {
  2795. (void) conn;
  2796. }
  2797. static void
  2798. connection_consider_empty_read_buckets(connection_t *conn)
  2799. {
  2800. (void) conn;
  2801. }
  2802. #endif
  2803. /** Read bytes from conn-\>s and process them.
  2804. *
  2805. * It calls connection_read_to_buf() to bring in any new bytes,
  2806. * and then calls connection_process_inbuf() to process them.
  2807. *
  2808. * Mark the connection and return -1 if you want to close it, else
  2809. * return 0.
  2810. */
  2811. static int
  2812. connection_handle_read_impl(connection_t *conn)
  2813. {
  2814. ssize_t max_to_read=-1, try_to_read;
  2815. size_t before, n_read = 0;
  2816. int socket_error = 0;
  2817. if (conn->marked_for_close)
  2818. return 0; /* do nothing */
  2819. conn->timestamp_lastread = approx_time();
  2820. switch (conn->type) {
  2821. case CONN_TYPE_OR_LISTENER:
  2822. return connection_handle_listener_read(conn, CONN_TYPE_OR);
  2823. case CONN_TYPE_EXT_OR_LISTENER:
  2824. return connection_handle_listener_read(conn, CONN_TYPE_EXT_OR);
  2825. case CONN_TYPE_AP_LISTENER:
  2826. case CONN_TYPE_AP_TRANS_LISTENER:
  2827. case CONN_TYPE_AP_NATD_LISTENER:
  2828. return connection_handle_listener_read(conn, CONN_TYPE_AP);
  2829. case CONN_TYPE_DIR_LISTENER:
  2830. return connection_handle_listener_read(conn, CONN_TYPE_DIR);
  2831. case CONN_TYPE_CONTROL_LISTENER:
  2832. return connection_handle_listener_read(conn, CONN_TYPE_CONTROL);
  2833. case CONN_TYPE_AP_DNS_LISTENER:
  2834. /* This should never happen; eventdns.c handles the reads here. */
  2835. tor_fragile_assert();
  2836. return 0;
  2837. }
  2838. loop_again:
  2839. try_to_read = max_to_read;
  2840. tor_assert(!conn->marked_for_close);
  2841. before = buf_datalen(conn->inbuf);
  2842. if (connection_read_to_buf(conn, &max_to_read, &socket_error) < 0) {
  2843. /* There's a read error; kill the connection.*/
  2844. if (conn->type == CONN_TYPE_OR) {
  2845. connection_or_notify_error(TO_OR_CONN(conn),
  2846. socket_error != 0 ?
  2847. errno_to_orconn_end_reason(socket_error) :
  2848. END_OR_CONN_REASON_CONNRESET,
  2849. socket_error != 0 ?
  2850. tor_socket_strerror(socket_error) :
  2851. "(unknown, errno was 0)");
  2852. }
  2853. if (CONN_IS_EDGE(conn)) {
  2854. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  2855. connection_edge_end_errno(edge_conn);
  2856. if (conn->type == CONN_TYPE_AP && TO_ENTRY_CONN(conn)->socks_request) {
  2857. /* broken, don't send a socks reply back */
  2858. TO_ENTRY_CONN(conn)->socks_request->has_finished = 1;
  2859. }
  2860. }
  2861. connection_close_immediate(conn); /* Don't flush; connection is dead. */
  2862. /*
  2863. * This can bypass normal channel checking since we did
  2864. * connection_or_notify_error() above.
  2865. */
  2866. connection_mark_for_close_internal(conn);
  2867. return -1;
  2868. }
  2869. n_read += buf_datalen(conn->inbuf) - before;
  2870. if (CONN_IS_EDGE(conn) && try_to_read != max_to_read) {
  2871. /* instruct it not to try to package partial cells. */
  2872. if (connection_process_inbuf(conn, 0) < 0) {
  2873. return -1;
  2874. }
  2875. if (!conn->marked_for_close &&
  2876. connection_is_reading(conn) &&
  2877. !conn->inbuf_reached_eof &&
  2878. max_to_read > 0)
  2879. goto loop_again; /* try reading again, in case more is here now */
  2880. }
  2881. /* one last try, packaging partial cells and all. */
  2882. if (!conn->marked_for_close &&
  2883. connection_process_inbuf(conn, 1) < 0) {
  2884. return -1;
  2885. }
  2886. if (conn->linked_conn) {
  2887. /* The other side's handle_write() will never actually get called, so
  2888. * we need to invoke the appropriate callbacks ourself. */
  2889. connection_t *linked = conn->linked_conn;
  2890. if (n_read) {
  2891. /* Probably a no-op, since linked conns typically don't count for
  2892. * bandwidth rate limiting. But do it anyway so we can keep stats
  2893. * accurately. Note that since we read the bytes from conn, and
  2894. * we're writing the bytes onto the linked connection, we count
  2895. * these as <i>written</i> bytes. */
  2896. connection_buckets_decrement(linked, approx_time(), 0, n_read);
  2897. if (connection_flushed_some(linked) < 0)
  2898. connection_mark_for_close(linked);
  2899. if (!connection_wants_to_flush(linked))
  2900. connection_finished_flushing(linked);
  2901. }
  2902. if (!buf_datalen(linked->outbuf) && conn->active_on_link)
  2903. connection_stop_reading_from_linked_conn(conn);
  2904. }
  2905. /* If we hit the EOF, call connection_reached_eof(). */
  2906. if (!conn->marked_for_close &&
  2907. conn->inbuf_reached_eof &&
  2908. connection_reached_eof(conn) < 0) {
  2909. return -1;
  2910. }
  2911. return 0;
  2912. }
  2913. /* DOCDOC connection_handle_read */
  2914. int
  2915. connection_handle_read(connection_t *conn)
  2916. {
  2917. int res;
  2918. tor_gettimeofday_cache_clear();
  2919. res = connection_handle_read_impl(conn);
  2920. return res;
  2921. }
  2922. /** Pull in new bytes from conn-\>s or conn-\>linked_conn onto conn-\>inbuf,
  2923. * either directly or via TLS. Reduce the token buckets by the number of bytes
  2924. * read.
  2925. *
  2926. * If *max_to_read is -1, then decide it ourselves, else go with the
  2927. * value passed to us. When returning, if it's changed, subtract the
  2928. * number of bytes we read from *max_to_read.
  2929. *
  2930. * Return -1 if we want to break conn, else return 0.
  2931. */
  2932. static int
  2933. connection_read_to_buf(connection_t *conn, ssize_t *max_to_read,
  2934. int *socket_error)
  2935. {
  2936. int result;
  2937. ssize_t at_most = *max_to_read;
  2938. size_t slack_in_buf, more_to_read;
  2939. size_t n_read = 0, n_written = 0;
  2940. if (at_most == -1) { /* we need to initialize it */
  2941. /* how many bytes are we allowed to read? */
  2942. at_most = connection_bucket_read_limit(conn, approx_time());
  2943. }
  2944. slack_in_buf = buf_slack(conn->inbuf);
  2945. again:
  2946. if ((size_t)at_most > slack_in_buf && slack_in_buf >= 1024) {
  2947. more_to_read = at_most - slack_in_buf;
  2948. at_most = slack_in_buf;
  2949. } else {
  2950. more_to_read = 0;
  2951. }
  2952. if (connection_speaks_cells(conn) &&
  2953. conn->state > OR_CONN_STATE_PROXY_HANDSHAKING) {
  2954. int pending;
  2955. or_connection_t *or_conn = TO_OR_CONN(conn);
  2956. size_t initial_size;
  2957. if (conn->state == OR_CONN_STATE_TLS_HANDSHAKING ||
  2958. conn->state == OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING) {
  2959. /* continue handshaking even if global token bucket is empty */
  2960. return connection_tls_continue_handshake(or_conn);
  2961. }
  2962. log_debug(LD_NET,
  2963. "%d: starting, inbuf_datalen %ld (%d pending in tls object)."
  2964. " at_most %ld.",
  2965. (int)conn->s,(long)buf_datalen(conn->inbuf),
  2966. tor_tls_get_pending_bytes(or_conn->tls), (long)at_most);
  2967. initial_size = buf_datalen(conn->inbuf);
  2968. /* else open, or closing */
  2969. result = read_to_buf_tls(or_conn->tls, at_most, conn->inbuf);
  2970. if (TOR_TLS_IS_ERROR(result) || result == TOR_TLS_CLOSE)
  2971. or_conn->tls_error = result;
  2972. else
  2973. or_conn->tls_error = 0;
  2974. switch (result) {
  2975. case TOR_TLS_CLOSE:
  2976. case TOR_TLS_ERROR_IO:
  2977. log_debug(LD_NET,"TLS connection closed %son read. Closing. "
  2978. "(Nickname %s, address %s)",
  2979. result == TOR_TLS_CLOSE ? "cleanly " : "",
  2980. or_conn->nickname ? or_conn->nickname : "not set",
  2981. conn->address);
  2982. return result;
  2983. CASE_TOR_TLS_ERROR_ANY_NONIO:
  2984. log_debug(LD_NET,"tls error [%s]. breaking (nickname %s, address %s).",
  2985. tor_tls_err_to_string(result),
  2986. or_conn->nickname ? or_conn->nickname : "not set",
  2987. conn->address);
  2988. return result;
  2989. case TOR_TLS_WANTWRITE:
  2990. connection_start_writing(conn);
  2991. return 0;
  2992. case TOR_TLS_WANTREAD:
  2993. if (conn->in_connection_handle_write) {
  2994. /* We've been invoked from connection_handle_write, because we're
  2995. * waiting for a TLS renegotiation, the renegotiation started, and
  2996. * SSL_read returned WANTWRITE. But now SSL_read is saying WANTREAD
  2997. * again. Stop waiting for write events now, or else we'll
  2998. * busy-loop until data arrives for us to read. */
  2999. connection_stop_writing(conn);
  3000. if (!connection_is_reading(conn))
  3001. connection_start_reading(conn);
  3002. }
  3003. /* we're already reading, one hopes */
  3004. result = 0;
  3005. break;
  3006. case TOR_TLS_DONE: /* no data read, so nothing to process */
  3007. result = 0;
  3008. break; /* so we call bucket_decrement below */
  3009. default:
  3010. break;
  3011. }
  3012. pending = tor_tls_get_pending_bytes(or_conn->tls);
  3013. if (pending) {
  3014. /* If we have any pending bytes, we read them now. This *can*
  3015. * take us over our read allotment, but really we shouldn't be
  3016. * believing that SSL bytes are the same as TCP bytes anyway. */
  3017. int r2 = read_to_buf_tls(or_conn->tls, pending, conn->inbuf);
  3018. if (r2<0) {
  3019. log_warn(LD_BUG, "apparently, reading pending bytes can fail.");
  3020. return -1;
  3021. }
  3022. }
  3023. result = (int)(buf_datalen(conn->inbuf)-initial_size);
  3024. tor_tls_get_n_raw_bytes(or_conn->tls, &n_read, &n_written);
  3025. log_debug(LD_GENERAL, "After TLS read of %d: %ld read, %ld written",
  3026. result, (long)n_read, (long)n_written);
  3027. } else if (conn->linked) {
  3028. if (conn->linked_conn) {
  3029. result = move_buf_to_buf(conn->inbuf, conn->linked_conn->outbuf,
  3030. &conn->linked_conn->outbuf_flushlen);
  3031. } else {
  3032. result = 0;
  3033. }
  3034. //log_notice(LD_GENERAL, "Moved %d bytes on an internal link!", result);
  3035. /* If the other side has disappeared, or if it's been marked for close and
  3036. * we flushed its outbuf, then we should set our inbuf_reached_eof. */
  3037. if (!conn->linked_conn ||
  3038. (conn->linked_conn->marked_for_close &&
  3039. buf_datalen(conn->linked_conn->outbuf) == 0))
  3040. conn->inbuf_reached_eof = 1;
  3041. n_read = (size_t) result;
  3042. } else {
  3043. /* !connection_speaks_cells, !conn->linked_conn. */
  3044. int reached_eof = 0;
  3045. CONN_LOG_PROTECT(conn,
  3046. result = read_to_buf(conn->s, at_most, conn->inbuf, &reached_eof,
  3047. socket_error));
  3048. if (reached_eof)
  3049. conn->inbuf_reached_eof = 1;
  3050. // log_fn(LOG_DEBUG,"read_to_buf returned %d.",read_result);
  3051. if (result < 0)
  3052. return -1;
  3053. n_read = (size_t) result;
  3054. }
  3055. if (n_read > 0) {
  3056. /* change *max_to_read */
  3057. *max_to_read = at_most - n_read;
  3058. /* Update edge_conn->n_read and ocirc->n_read_circ_bw */
  3059. if (conn->type == CONN_TYPE_AP) {
  3060. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  3061. circuit_t *circ = circuit_get_by_edge_conn(edge_conn);
  3062. origin_circuit_t *ocirc;
  3063. /* Check for overflow: */
  3064. if (PREDICT_LIKELY(UINT32_MAX - edge_conn->n_read > n_read))
  3065. edge_conn->n_read += (int)n_read;
  3066. else
  3067. edge_conn->n_read = UINT32_MAX;
  3068. if (circ && CIRCUIT_IS_ORIGIN(circ)) {
  3069. ocirc = TO_ORIGIN_CIRCUIT(circ);
  3070. if (PREDICT_LIKELY(UINT32_MAX - ocirc->n_read_circ_bw > n_read))
  3071. ocirc->n_read_circ_bw += (int)n_read;
  3072. else
  3073. ocirc->n_read_circ_bw = UINT32_MAX;
  3074. }
  3075. }
  3076. /* If CONN_BW events are enabled, update conn->n_read_conn_bw for
  3077. * OR/DIR/EXIT connections, checking for overflow. */
  3078. if (get_options()->TestingEnableConnBwEvent &&
  3079. (conn->type == CONN_TYPE_OR ||
  3080. conn->type == CONN_TYPE_DIR ||
  3081. conn->type == CONN_TYPE_EXIT)) {
  3082. if (PREDICT_LIKELY(UINT32_MAX - conn->n_read_conn_bw > n_read))
  3083. conn->n_read_conn_bw += (int)n_read;
  3084. else
  3085. conn->n_read_conn_bw = UINT32_MAX;
  3086. }
  3087. }
  3088. connection_buckets_decrement(conn, approx_time(), n_read, n_written);
  3089. if (more_to_read && result == at_most) {
  3090. slack_in_buf = buf_slack(conn->inbuf);
  3091. at_most = more_to_read;
  3092. goto again;
  3093. }
  3094. /* Call even if result is 0, since the global read bucket may
  3095. * have reached 0 on a different conn, and this guy needs to
  3096. * know to stop reading. */
  3097. connection_consider_empty_read_buckets(conn);
  3098. if (n_written > 0 && connection_is_writing(conn))
  3099. connection_consider_empty_write_buckets(conn);
  3100. return 0;
  3101. }
  3102. #ifdef USE_BUFFEREVENTS
  3103. /* XXXX These generic versions could be simplified by making them
  3104. type-specific */
  3105. /** Callback: Invoked whenever bytes are added to or drained from an input
  3106. * evbuffer. Used to track the number of bytes read. */
  3107. static void
  3108. evbuffer_inbuf_callback(struct evbuffer *buf,
  3109. const struct evbuffer_cb_info *info, void *arg)
  3110. {
  3111. connection_t *conn = arg;
  3112. (void) buf;
  3113. /* XXXX These need to get real counts on the non-nested TLS case. - NM */
  3114. if (info->n_added) {
  3115. time_t now = approx_time();
  3116. conn->timestamp_lastread = now;
  3117. record_num_bytes_transferred(conn, now, info->n_added, 0);
  3118. connection_consider_empty_read_buckets(conn);
  3119. if (conn->type == CONN_TYPE_AP) {
  3120. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  3121. /*XXXX024 check for overflow*/
  3122. edge_conn->n_read += (int)info->n_added;
  3123. }
  3124. }
  3125. }
  3126. /** Callback: Invoked whenever bytes are added to or drained from an output
  3127. * evbuffer. Used to track the number of bytes written. */
  3128. static void
  3129. evbuffer_outbuf_callback(struct evbuffer *buf,
  3130. const struct evbuffer_cb_info *info, void *arg)
  3131. {
  3132. connection_t *conn = arg;
  3133. (void)buf;
  3134. if (info->n_deleted) {
  3135. time_t now = approx_time();
  3136. conn->timestamp_lastwritten = now;
  3137. record_num_bytes_transferred(conn, now, 0, info->n_deleted);
  3138. connection_consider_empty_write_buckets(conn);
  3139. if (conn->type == CONN_TYPE_AP) {
  3140. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  3141. /*XXXX024 check for overflow*/
  3142. edge_conn->n_written += (int)info->n_deleted;
  3143. }
  3144. }
  3145. }
  3146. /** Callback: invoked whenever a bufferevent has read data. */
  3147. void
  3148. connection_handle_read_cb(struct bufferevent *bufev, void *arg)
  3149. {
  3150. connection_t *conn = arg;
  3151. (void) bufev;
  3152. if (!conn->marked_for_close) {
  3153. if (connection_process_inbuf(conn, 1)<0) /* XXXX Always 1? */
  3154. if (!conn->marked_for_close)
  3155. connection_mark_for_close(conn);
  3156. }
  3157. }
  3158. /** Callback: invoked whenever a bufferevent has written data. */
  3159. void
  3160. connection_handle_write_cb(struct bufferevent *bufev, void *arg)
  3161. {
  3162. connection_t *conn = arg;
  3163. struct evbuffer *output;
  3164. if (connection_flushed_some(conn)<0) {
  3165. if (!conn->marked_for_close)
  3166. connection_mark_for_close(conn);
  3167. return;
  3168. }
  3169. output = bufferevent_get_output(bufev);
  3170. if (!evbuffer_get_length(output)) {
  3171. connection_finished_flushing(conn);
  3172. if (conn->marked_for_close && conn->hold_open_until_flushed) {
  3173. conn->hold_open_until_flushed = 0;
  3174. if (conn->linked) {
  3175. /* send eof */
  3176. bufferevent_flush(conn->bufev, EV_WRITE, BEV_FINISHED);
  3177. }
  3178. }
  3179. }
  3180. }
  3181. /** Callback: invoked whenever a bufferevent has had an event (like a
  3182. * connection, or an eof, or an error) occur. */
  3183. void
  3184. connection_handle_event_cb(struct bufferevent *bufev, short event, void *arg)
  3185. {
  3186. connection_t *conn = arg;
  3187. (void) bufev;
  3188. if (conn->marked_for_close)
  3189. return;
  3190. if (event & BEV_EVENT_CONNECTED) {
  3191. tor_assert(connection_state_is_connecting(conn));
  3192. if (connection_finished_connecting(conn)<0)
  3193. return;
  3194. }
  3195. if (event & BEV_EVENT_EOF) {
  3196. if (!conn->marked_for_close) {
  3197. conn->inbuf_reached_eof = 1;
  3198. if (connection_reached_eof(conn)<0)
  3199. return;
  3200. }
  3201. }
  3202. if (event & BEV_EVENT_ERROR) {
  3203. int socket_error = evutil_socket_geterror(conn->s);
  3204. if (conn->type == CONN_TYPE_OR &&
  3205. conn->state == OR_CONN_STATE_CONNECTING) {
  3206. connection_or_connect_failed(TO_OR_CONN(conn),
  3207. errno_to_orconn_end_reason(socket_error),
  3208. tor_socket_strerror(socket_error));
  3209. } else if (CONN_IS_EDGE(conn)) {
  3210. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  3211. if (!edge_conn->edge_has_sent_end)
  3212. connection_edge_end_errno(edge_conn);
  3213. if (conn->type == CONN_TYPE_AP && TO_ENTRY_CONN(conn)->socks_request) {
  3214. /* broken, don't send a socks reply back */
  3215. TO_ENTRY_CONN(conn)->socks_request->has_finished = 1;
  3216. }
  3217. }
  3218. connection_close_immediate(conn); /* Connection is dead. */
  3219. if (!conn->marked_for_close)
  3220. connection_mark_for_close(conn);
  3221. }
  3222. }
  3223. /** Set up the generic callbacks for the bufferevent on <b>conn</b>. */
  3224. void
  3225. connection_configure_bufferevent_callbacks(connection_t *conn)
  3226. {
  3227. struct bufferevent *bufev;
  3228. struct evbuffer *input, *output;
  3229. tor_assert(conn->bufev);
  3230. bufev = conn->bufev;
  3231. bufferevent_setcb(bufev,
  3232. connection_handle_read_cb,
  3233. connection_handle_write_cb,
  3234. connection_handle_event_cb,
  3235. conn);
  3236. /* Set a fairly high write low-watermark so that we get the write callback
  3237. called whenever data is written to bring us under 128K. Leave the
  3238. high-watermark at 0.
  3239. */
  3240. bufferevent_setwatermark(bufev, EV_WRITE, 128*1024, 0);
  3241. input = bufferevent_get_input(bufev);
  3242. output = bufferevent_get_output(bufev);
  3243. evbuffer_add_cb(input, evbuffer_inbuf_callback, conn);
  3244. evbuffer_add_cb(output, evbuffer_outbuf_callback, conn);
  3245. }
  3246. #endif
  3247. /** A pass-through to fetch_from_buf. */
  3248. int
  3249. connection_fetch_from_buf(char *string, size_t len, connection_t *conn)
  3250. {
  3251. IF_HAS_BUFFEREVENT(conn, {
  3252. /* XXX overflow -seb */
  3253. return (int)bufferevent_read(conn->bufev, string, len);
  3254. }) ELSE_IF_NO_BUFFEREVENT {
  3255. return fetch_from_buf(string, len, conn->inbuf);
  3256. }
  3257. }
  3258. /** As fetch_from_buf_line(), but read from a connection's input buffer. */
  3259. int
  3260. connection_fetch_from_buf_line(connection_t *conn, char *data,
  3261. size_t *data_len)
  3262. {
  3263. IF_HAS_BUFFEREVENT(conn, {
  3264. int r;
  3265. size_t eol_len=0;
  3266. struct evbuffer *input = bufferevent_get_input(conn->bufev);
  3267. struct evbuffer_ptr ptr =
  3268. evbuffer_search_eol(input, NULL, &eol_len, EVBUFFER_EOL_LF);
  3269. if (ptr.pos == -1)
  3270. return 0; /* No EOL found. */
  3271. if ((size_t)ptr.pos+eol_len >= *data_len) {
  3272. return -1; /* Too long */
  3273. }
  3274. *data_len = ptr.pos+eol_len;
  3275. r = evbuffer_remove(input, data, ptr.pos+eol_len);
  3276. tor_assert(r >= 0);
  3277. data[ptr.pos+eol_len] = '\0';
  3278. return 1;
  3279. }) ELSE_IF_NO_BUFFEREVENT {
  3280. return fetch_from_buf_line(conn->inbuf, data, data_len);
  3281. }
  3282. }
  3283. /** As fetch_from_buf_http, but fetches from a conncetion's input buffer_t or
  3284. * its bufferevent as appropriate. */
  3285. int
  3286. connection_fetch_from_buf_http(connection_t *conn,
  3287. char **headers_out, size_t max_headerlen,
  3288. char **body_out, size_t *body_used,
  3289. size_t max_bodylen, int force_complete)
  3290. {
  3291. IF_HAS_BUFFEREVENT(conn, {
  3292. struct evbuffer *input = bufferevent_get_input(conn->bufev);
  3293. return fetch_from_evbuffer_http(input, headers_out, max_headerlen,
  3294. body_out, body_used, max_bodylen, force_complete);
  3295. }) ELSE_IF_NO_BUFFEREVENT {
  3296. return fetch_from_buf_http(conn->inbuf, headers_out, max_headerlen,
  3297. body_out, body_used, max_bodylen, force_complete);
  3298. }
  3299. }
  3300. /** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
  3301. * from its outbuf. */
  3302. int
  3303. connection_wants_to_flush(connection_t *conn)
  3304. {
  3305. return conn->outbuf_flushlen > 0;
  3306. }
  3307. /** Are there too many bytes on edge connection <b>conn</b>'s outbuf to
  3308. * send back a relay-level sendme yet? Return 1 if so, 0 if not. Used by
  3309. * connection_edge_consider_sending_sendme().
  3310. */
  3311. int
  3312. connection_outbuf_too_full(connection_t *conn)
  3313. {
  3314. return (conn->outbuf_flushlen > 10*CELL_PAYLOAD_SIZE);
  3315. }
  3316. /** Try to flush more bytes onto <b>conn</b>-\>s.
  3317. *
  3318. * This function gets called either from conn_write_callback() in main.c
  3319. * when libevent tells us that conn wants to write, or below
  3320. * from connection_write_to_buf() when an entire TLS record is ready.
  3321. *
  3322. * Update <b>conn</b>-\>timestamp_lastwritten to now, and call flush_buf
  3323. * or flush_buf_tls appropriately. If it succeeds and there are no more
  3324. * more bytes on <b>conn</b>-\>outbuf, then call connection_finished_flushing
  3325. * on it too.
  3326. *
  3327. * If <b>force</b>, then write as many bytes as possible, ignoring bandwidth
  3328. * limits. (Used for flushing messages to controller connections on fatal
  3329. * errors.)
  3330. *
  3331. * Mark the connection and return -1 if you want to close it, else
  3332. * return 0.
  3333. */
  3334. static int
  3335. connection_handle_write_impl(connection_t *conn, int force)
  3336. {
  3337. int e;
  3338. socklen_t len=(socklen_t)sizeof(e);
  3339. int result;
  3340. ssize_t max_to_write;
  3341. time_t now = approx_time();
  3342. size_t n_read = 0, n_written = 0;
  3343. int dont_stop_writing = 0;
  3344. tor_assert(!connection_is_listener(conn));
  3345. if (conn->marked_for_close || !SOCKET_OK(conn->s))
  3346. return 0; /* do nothing */
  3347. if (conn->in_flushed_some) {
  3348. log_warn(LD_BUG, "called recursively from inside conn->in_flushed_some");
  3349. return 0;
  3350. }
  3351. conn->timestamp_lastwritten = now;
  3352. /* Sometimes, "writable" means "connected". */
  3353. if (connection_state_is_connecting(conn)) {
  3354. if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) {
  3355. log_warn(LD_BUG, "getsockopt() syscall failed");
  3356. if (conn->type == CONN_TYPE_OR) {
  3357. or_connection_t *orconn = TO_OR_CONN(conn);
  3358. connection_or_close_for_error(orconn, 0);
  3359. } else {
  3360. if (CONN_IS_EDGE(conn)) {
  3361. connection_edge_end_errno(TO_EDGE_CONN(conn));
  3362. }
  3363. connection_mark_for_close(conn);
  3364. }
  3365. return -1;
  3366. }
  3367. if (e) {
  3368. /* some sort of error, but maybe just inprogress still */
  3369. if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
  3370. log_info(LD_NET,"in-progress connect failed. Removing. (%s)",
  3371. tor_socket_strerror(e));
  3372. if (CONN_IS_EDGE(conn))
  3373. connection_edge_end_errno(TO_EDGE_CONN(conn));
  3374. if (conn->type == CONN_TYPE_OR)
  3375. connection_or_notify_error(TO_OR_CONN(conn),
  3376. errno_to_orconn_end_reason(e),
  3377. tor_socket_strerror(e));
  3378. connection_close_immediate(conn);
  3379. /*
  3380. * This can bypass normal channel checking since we did
  3381. * connection_or_notify_error() above.
  3382. */
  3383. connection_mark_for_close_internal(conn);
  3384. return -1;
  3385. } else {
  3386. return 0; /* no change, see if next time is better */
  3387. }
  3388. }
  3389. /* The connection is successful. */
  3390. if (connection_finished_connecting(conn)<0)
  3391. return -1;
  3392. }
  3393. max_to_write = force ? (ssize_t)conn->outbuf_flushlen
  3394. : connection_bucket_write_limit(conn, now);
  3395. if (connection_speaks_cells(conn) &&
  3396. conn->state > OR_CONN_STATE_PROXY_HANDSHAKING) {
  3397. or_connection_t *or_conn = TO_OR_CONN(conn);
  3398. size_t initial_size;
  3399. if (conn->state == OR_CONN_STATE_TLS_HANDSHAKING ||
  3400. conn->state == OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING) {
  3401. connection_stop_writing(conn);
  3402. if (connection_tls_continue_handshake(or_conn) < 0) {
  3403. /* Don't flush; connection is dead. */
  3404. connection_or_notify_error(or_conn,
  3405. END_OR_CONN_REASON_MISC,
  3406. "TLS error in connection_tls_"
  3407. "continue_handshake()");
  3408. connection_close_immediate(conn);
  3409. /*
  3410. * This can bypass normal channel checking since we did
  3411. * connection_or_notify_error() above.
  3412. */
  3413. connection_mark_for_close_internal(conn);
  3414. return -1;
  3415. }
  3416. return 0;
  3417. } else if (conn->state == OR_CONN_STATE_TLS_SERVER_RENEGOTIATING) {
  3418. return connection_handle_read(conn);
  3419. }
  3420. /* else open, or closing */
  3421. initial_size = buf_datalen(conn->outbuf);
  3422. result = flush_buf_tls(or_conn->tls, conn->outbuf,
  3423. max_to_write, &conn->outbuf_flushlen);
  3424. /* If we just flushed the last bytes, tell the channel on the
  3425. * or_conn to check if it needs to geoip_change_dirreq_state() */
  3426. /* XXXX move this to flushed_some or finished_flushing -NM */
  3427. if (buf_datalen(conn->outbuf) == 0 && or_conn->chan)
  3428. channel_notify_flushed(TLS_CHAN_TO_BASE(or_conn->chan));
  3429. switch (result) {
  3430. CASE_TOR_TLS_ERROR_ANY:
  3431. case TOR_TLS_CLOSE:
  3432. log_info(LD_NET, result != TOR_TLS_CLOSE ?
  3433. "tls error. breaking.":"TLS connection closed on flush");
  3434. /* Don't flush; connection is dead. */
  3435. connection_or_notify_error(or_conn,
  3436. END_OR_CONN_REASON_MISC,
  3437. result != TOR_TLS_CLOSE ?
  3438. "TLS error in during flush" :
  3439. "TLS closed during flush");
  3440. connection_close_immediate(conn);
  3441. /*
  3442. * This can bypass normal channel checking since we did
  3443. * connection_or_notify_error() above.
  3444. */
  3445. connection_mark_for_close_internal(conn);
  3446. return -1;
  3447. case TOR_TLS_WANTWRITE:
  3448. log_debug(LD_NET,"wanted write.");
  3449. /* we're already writing */
  3450. dont_stop_writing = 1;
  3451. break;
  3452. case TOR_TLS_WANTREAD:
  3453. /* Make sure to avoid a loop if the receive buckets are empty. */
  3454. log_debug(LD_NET,"wanted read.");
  3455. if (!connection_is_reading(conn)) {
  3456. connection_stop_writing(conn);
  3457. conn->write_blocked_on_bw = 1;
  3458. /* we'll start reading again when we get more tokens in our
  3459. * read bucket; then we'll start writing again too.
  3460. */
  3461. }
  3462. /* else no problem, we're already reading */
  3463. return 0;
  3464. /* case TOR_TLS_DONE:
  3465. * for TOR_TLS_DONE, fall through to check if the flushlen
  3466. * is empty, so we can stop writing.
  3467. */
  3468. }
  3469. tor_tls_get_n_raw_bytes(or_conn->tls, &n_read, &n_written);
  3470. log_debug(LD_GENERAL, "After TLS write of %d: %ld read, %ld written",
  3471. result, (long)n_read, (long)n_written);
  3472. /* So we notice bytes were written even on error */
  3473. /* XXXX024 This cast is safe since we can never write INT_MAX bytes in a
  3474. * single set of TLS operations. But it looks kinda ugly. If we refactor
  3475. * the *_buf_tls functions, we should make them return ssize_t or size_t
  3476. * or something. */
  3477. result = (int)(initial_size-buf_datalen(conn->outbuf));
  3478. } else {
  3479. CONN_LOG_PROTECT(conn,
  3480. result = flush_buf(conn->s, conn->outbuf,
  3481. max_to_write, &conn->outbuf_flushlen));
  3482. if (result < 0) {
  3483. if (CONN_IS_EDGE(conn))
  3484. connection_edge_end_errno(TO_EDGE_CONN(conn));
  3485. if (conn->type == CONN_TYPE_AP) {
  3486. /* writing failed; we couldn't send a SOCKS reply if we wanted to */
  3487. TO_ENTRY_CONN(conn)->socks_request->has_finished = 1;
  3488. }
  3489. connection_close_immediate(conn); /* Don't flush; connection is dead. */
  3490. connection_mark_for_close(conn);
  3491. return -1;
  3492. }
  3493. n_written = (size_t) result;
  3494. }
  3495. if (n_written && conn->type == CONN_TYPE_AP) {
  3496. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  3497. circuit_t *circ = circuit_get_by_edge_conn(edge_conn);
  3498. origin_circuit_t *ocirc;
  3499. /* Check for overflow: */
  3500. if (PREDICT_LIKELY(UINT32_MAX - edge_conn->n_written > n_written))
  3501. edge_conn->n_written += (int)n_written;
  3502. else
  3503. edge_conn->n_written = UINT32_MAX;
  3504. if (circ && CIRCUIT_IS_ORIGIN(circ)) {
  3505. ocirc = TO_ORIGIN_CIRCUIT(circ);
  3506. if (PREDICT_LIKELY(UINT32_MAX - ocirc->n_written_circ_bw > n_written))
  3507. ocirc->n_written_circ_bw += (int)n_written;
  3508. else
  3509. ocirc->n_written_circ_bw = UINT32_MAX;
  3510. }
  3511. }
  3512. /* If CONN_BW events are enabled, update conn->n_written_conn_bw for
  3513. * OR/DIR/EXIT connections, checking for overflow. */
  3514. if (n_written && get_options()->TestingEnableConnBwEvent &&
  3515. (conn->type == CONN_TYPE_OR ||
  3516. conn->type == CONN_TYPE_DIR ||
  3517. conn->type == CONN_TYPE_EXIT)) {
  3518. if (PREDICT_LIKELY(UINT32_MAX - conn->n_written_conn_bw > n_written))
  3519. conn->n_written_conn_bw += (int)n_written;
  3520. else
  3521. conn->n_written_conn_bw = UINT32_MAX;
  3522. }
  3523. connection_buckets_decrement(conn, approx_time(), n_read, n_written);
  3524. if (result > 0) {
  3525. /* If we wrote any bytes from our buffer, then call the appropriate
  3526. * functions. */
  3527. if (connection_flushed_some(conn) < 0) {
  3528. if (connection_speaks_cells(conn)) {
  3529. connection_or_notify_error(TO_OR_CONN(conn),
  3530. END_OR_CONN_REASON_MISC,
  3531. "Got error back from "
  3532. "connection_flushed_some()");
  3533. }
  3534. /*
  3535. * This can bypass normal channel checking since we did
  3536. * connection_or_notify_error() above.
  3537. */
  3538. connection_mark_for_close_internal(conn);
  3539. }
  3540. }
  3541. if (!connection_wants_to_flush(conn) &&
  3542. !dont_stop_writing) { /* it's done flushing */
  3543. if (connection_finished_flushing(conn) < 0) {
  3544. /* already marked */
  3545. return -1;
  3546. }
  3547. return 0;
  3548. }
  3549. /* Call even if result is 0, since the global write bucket may
  3550. * have reached 0 on a different conn, and this guy needs to
  3551. * know to stop writing. */
  3552. connection_consider_empty_write_buckets(conn);
  3553. if (n_read > 0 && connection_is_reading(conn))
  3554. connection_consider_empty_read_buckets(conn);
  3555. return 0;
  3556. }
  3557. /* DOCDOC connection_handle_write */
  3558. int
  3559. connection_handle_write(connection_t *conn, int force)
  3560. {
  3561. int res;
  3562. tor_gettimeofday_cache_clear();
  3563. conn->in_connection_handle_write = 1;
  3564. res = connection_handle_write_impl(conn, force);
  3565. conn->in_connection_handle_write = 0;
  3566. return res;
  3567. }
  3568. /**
  3569. * Try to flush data that's waiting for a write on <b>conn</b>. Return
  3570. * -1 on failure, 0 on success.
  3571. *
  3572. * Don't use this function for regular writing; the buffers/bufferevents
  3573. * system should be good enough at scheduling writes there. Instead, this
  3574. * function is for cases when we're about to exit or something and we want
  3575. * to report it right away.
  3576. */
  3577. int
  3578. connection_flush(connection_t *conn)
  3579. {
  3580. IF_HAS_BUFFEREVENT(conn, {
  3581. int r = bufferevent_flush(conn->bufev, EV_WRITE, BEV_FLUSH);
  3582. return (r < 0) ? -1 : 0;
  3583. });
  3584. return connection_handle_write(conn, 1);
  3585. }
  3586. /** Append <b>len</b> bytes of <b>string</b> onto <b>conn</b>'s
  3587. * outbuf, and ask it to start writing.
  3588. *
  3589. * If <b>zlib</b> is nonzero, this is a directory connection that should get
  3590. * its contents compressed or decompressed as they're written. If zlib is
  3591. * negative, this is the last data to be compressed, and the connection's zlib
  3592. * state should be flushed.
  3593. *
  3594. * If it's a local control connection and a 64k chunk is ready, try to flush
  3595. * it all, so we don't end up with many megabytes of controller info queued at
  3596. * once.
  3597. */
  3598. MOCK_IMPL(void,
  3599. connection_write_to_buf_impl_,(const char *string, size_t len,
  3600. connection_t *conn, int zlib))
  3601. {
  3602. /* XXXX This function really needs to return -1 on failure. */
  3603. int r;
  3604. size_t old_datalen;
  3605. if (!len && !(zlib<0))
  3606. return;
  3607. /* if it's marked for close, only allow write if we mean to flush it */
  3608. if (conn->marked_for_close && !conn->hold_open_until_flushed)
  3609. return;
  3610. IF_HAS_BUFFEREVENT(conn, {
  3611. if (zlib) {
  3612. int done = zlib < 0;
  3613. r = write_to_evbuffer_zlib(bufferevent_get_output(conn->bufev),
  3614. TO_DIR_CONN(conn)->zlib_state,
  3615. string, len, done);
  3616. } else {
  3617. r = bufferevent_write(conn->bufev, string, len);
  3618. }
  3619. if (r < 0) {
  3620. /* XXXX mark for close? */
  3621. log_warn(LD_NET, "bufferevent_write failed! That shouldn't happen.");
  3622. }
  3623. return;
  3624. });
  3625. old_datalen = buf_datalen(conn->outbuf);
  3626. if (zlib) {
  3627. dir_connection_t *dir_conn = TO_DIR_CONN(conn);
  3628. int done = zlib < 0;
  3629. CONN_LOG_PROTECT(conn, r = write_to_buf_zlib(conn->outbuf,
  3630. dir_conn->zlib_state,
  3631. string, len, done));
  3632. } else {
  3633. CONN_LOG_PROTECT(conn, r = write_to_buf(string, len, conn->outbuf));
  3634. }
  3635. if (r < 0) {
  3636. if (CONN_IS_EDGE(conn)) {
  3637. /* if it failed, it means we have our package/delivery windows set
  3638. wrong compared to our max outbuf size. close the whole circuit. */
  3639. log_warn(LD_NET,
  3640. "write_to_buf failed. Closing circuit (fd %d).", (int)conn->s);
  3641. circuit_mark_for_close(circuit_get_by_edge_conn(TO_EDGE_CONN(conn)),
  3642. END_CIRC_REASON_INTERNAL);
  3643. } else if (conn->type == CONN_TYPE_OR) {
  3644. or_connection_t *orconn = TO_OR_CONN(conn);
  3645. log_warn(LD_NET,
  3646. "write_to_buf failed on an orconn; notifying of error "
  3647. "(fd %d)", (int)(conn->s));
  3648. connection_or_close_for_error(orconn, 0);
  3649. } else {
  3650. log_warn(LD_NET,
  3651. "write_to_buf failed. Closing connection (fd %d).",
  3652. (int)conn->s);
  3653. connection_mark_for_close(conn);
  3654. }
  3655. return;
  3656. }
  3657. /* If we receive optimistic data in the EXIT_CONN_STATE_RESOLVING
  3658. * state, we don't want to try to write it right away, since
  3659. * conn->write_event won't be set yet. Otherwise, write data from
  3660. * this conn as the socket is available. */
  3661. if (conn->write_event) {
  3662. connection_start_writing(conn);
  3663. }
  3664. if (zlib) {
  3665. conn->outbuf_flushlen += buf_datalen(conn->outbuf) - old_datalen;
  3666. } else {
  3667. conn->outbuf_flushlen += len;
  3668. /* Should we try flushing the outbuf now? */
  3669. if (conn->in_flushed_some) {
  3670. /* Don't flush the outbuf when the reason we're writing more stuff is
  3671. * _because_ we flushed the outbuf. That's unfair. */
  3672. return;
  3673. }
  3674. if (conn->type == CONN_TYPE_CONTROL &&
  3675. !connection_is_rate_limited(conn) &&
  3676. conn->outbuf_flushlen-len < 1<<16 &&
  3677. conn->outbuf_flushlen >= 1<<16) {
  3678. /* just try to flush all of it */
  3679. } else
  3680. return; /* no need to try flushing */
  3681. if (connection_handle_write(conn, 0) < 0) {
  3682. if (!conn->marked_for_close) {
  3683. /* this connection is broken. remove it. */
  3684. log_warn(LD_BUG, "unhandled error on write for "
  3685. "conn (type %d, fd %d); removing",
  3686. conn->type, (int)conn->s);
  3687. tor_fragile_assert();
  3688. /* do a close-immediate here, so we don't try to flush */
  3689. connection_close_immediate(conn);
  3690. }
  3691. return;
  3692. }
  3693. }
  3694. }
  3695. /** Return a connection with given type, address, port, and purpose;
  3696. * or NULL if no such connection exists. */
  3697. connection_t *
  3698. connection_get_by_type_addr_port_purpose(int type,
  3699. const tor_addr_t *addr, uint16_t port,
  3700. int purpose)
  3701. {
  3702. smartlist_t *conns = get_connection_array();
  3703. SMARTLIST_FOREACH(conns, connection_t *, conn,
  3704. {
  3705. if (conn->type == type &&
  3706. tor_addr_eq(&conn->addr, addr) &&
  3707. conn->port == port &&
  3708. conn->purpose == purpose &&
  3709. !conn->marked_for_close)
  3710. return conn;
  3711. });
  3712. return NULL;
  3713. }
  3714. /** Return the stream with id <b>id</b> if it is not already marked for
  3715. * close.
  3716. */
  3717. connection_t *
  3718. connection_get_by_global_id(uint64_t id)
  3719. {
  3720. smartlist_t *conns = get_connection_array();
  3721. SMARTLIST_FOREACH(conns, connection_t *, conn,
  3722. {
  3723. if (conn->global_identifier == id)
  3724. return conn;
  3725. });
  3726. return NULL;
  3727. }
  3728. /** Return a connection of type <b>type</b> that is not marked for close.
  3729. */
  3730. connection_t *
  3731. connection_get_by_type(int type)
  3732. {
  3733. smartlist_t *conns = get_connection_array();
  3734. SMARTLIST_FOREACH(conns, connection_t *, conn,
  3735. {
  3736. if (conn->type == type && !conn->marked_for_close)
  3737. return conn;
  3738. });
  3739. return NULL;
  3740. }
  3741. /** Return a connection of type <b>type</b> that is in state <b>state</b>,
  3742. * and that is not marked for close.
  3743. */
  3744. connection_t *
  3745. connection_get_by_type_state(int type, int state)
  3746. {
  3747. smartlist_t *conns = get_connection_array();
  3748. SMARTLIST_FOREACH(conns, connection_t *, conn,
  3749. {
  3750. if (conn->type == type && conn->state == state && !conn->marked_for_close)
  3751. return conn;
  3752. });
  3753. return NULL;
  3754. }
  3755. /** Return a connection of type <b>type</b> that has rendquery equal
  3756. * to <b>rendquery</b>, and that is not marked for close. If state
  3757. * is non-zero, conn must be of that state too.
  3758. */
  3759. connection_t *
  3760. connection_get_by_type_state_rendquery(int type, int state,
  3761. const char *rendquery)
  3762. {
  3763. smartlist_t *conns = get_connection_array();
  3764. tor_assert(type == CONN_TYPE_DIR ||
  3765. type == CONN_TYPE_AP || type == CONN_TYPE_EXIT);
  3766. tor_assert(rendquery);
  3767. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
  3768. if (conn->type == type &&
  3769. !conn->marked_for_close &&
  3770. (!state || state == conn->state)) {
  3771. if (type == CONN_TYPE_DIR &&
  3772. TO_DIR_CONN(conn)->rend_data &&
  3773. !rend_cmp_service_ids(rendquery,
  3774. TO_DIR_CONN(conn)->rend_data->onion_address))
  3775. return conn;
  3776. else if (CONN_IS_EDGE(conn) &&
  3777. TO_EDGE_CONN(conn)->rend_data &&
  3778. !rend_cmp_service_ids(rendquery,
  3779. TO_EDGE_CONN(conn)->rend_data->onion_address))
  3780. return conn;
  3781. }
  3782. } SMARTLIST_FOREACH_END(conn);
  3783. return NULL;
  3784. }
  3785. /** Return a directory connection (if any one exists) that is fetching
  3786. * the item described by <b>state</b>/<b>resource</b> */
  3787. dir_connection_t *
  3788. connection_dir_get_by_purpose_and_resource(int purpose,
  3789. const char *resource)
  3790. {
  3791. smartlist_t *conns = get_connection_array();
  3792. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
  3793. dir_connection_t *dirconn;
  3794. if (conn->type != CONN_TYPE_DIR || conn->marked_for_close ||
  3795. conn->purpose != purpose)
  3796. continue;
  3797. dirconn = TO_DIR_CONN(conn);
  3798. if (dirconn->requested_resource == NULL) {
  3799. if (resource == NULL)
  3800. return dirconn;
  3801. } else if (resource) {
  3802. if (0 == strcmp(resource, dirconn->requested_resource))
  3803. return dirconn;
  3804. }
  3805. } SMARTLIST_FOREACH_END(conn);
  3806. return NULL;
  3807. }
  3808. /** Return 1 if there are any active OR connections apart from
  3809. * <b>this_conn</b>.
  3810. *
  3811. * We use this to guess if we should tell the controller that we
  3812. * didn't manage to connect to any of our bridges. */
  3813. int
  3814. any_other_active_or_conns(const or_connection_t *this_conn)
  3815. {
  3816. smartlist_t *conns = get_connection_array();
  3817. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, conn) {
  3818. if (conn == TO_CONN(this_conn)) { /* don't consider this conn */
  3819. continue;
  3820. }
  3821. if (conn->type == CONN_TYPE_OR &&
  3822. !conn->marked_for_close) {
  3823. log_debug(LD_DIR, "%s: Found an OR connection: %s",
  3824. __func__, conn->address);
  3825. return 1;
  3826. }
  3827. } SMARTLIST_FOREACH_END(conn);
  3828. return 0;
  3829. }
  3830. /** Return 1 if <b>conn</b> is a listener conn, else return 0. */
  3831. int
  3832. connection_is_listener(connection_t *conn)
  3833. {
  3834. if (conn->type == CONN_TYPE_OR_LISTENER ||
  3835. conn->type == CONN_TYPE_EXT_OR_LISTENER ||
  3836. conn->type == CONN_TYPE_AP_LISTENER ||
  3837. conn->type == CONN_TYPE_AP_TRANS_LISTENER ||
  3838. conn->type == CONN_TYPE_AP_DNS_LISTENER ||
  3839. conn->type == CONN_TYPE_AP_NATD_LISTENER ||
  3840. conn->type == CONN_TYPE_DIR_LISTENER ||
  3841. conn->type == CONN_TYPE_CONTROL_LISTENER)
  3842. return 1;
  3843. return 0;
  3844. }
  3845. /** Return 1 if <b>conn</b> is in state "open" and is not marked
  3846. * for close, else return 0.
  3847. */
  3848. int
  3849. connection_state_is_open(connection_t *conn)
  3850. {
  3851. tor_assert(conn);
  3852. if (conn->marked_for_close)
  3853. return 0;
  3854. if ((conn->type == CONN_TYPE_OR && conn->state == OR_CONN_STATE_OPEN) ||
  3855. (conn->type == CONN_TYPE_EXT_OR) ||
  3856. (conn->type == CONN_TYPE_AP && conn->state == AP_CONN_STATE_OPEN) ||
  3857. (conn->type == CONN_TYPE_EXIT && conn->state == EXIT_CONN_STATE_OPEN) ||
  3858. (conn->type == CONN_TYPE_CONTROL &&
  3859. conn->state == CONTROL_CONN_STATE_OPEN))
  3860. return 1;
  3861. return 0;
  3862. }
  3863. /** Return 1 if conn is in 'connecting' state, else return 0. */
  3864. int
  3865. connection_state_is_connecting(connection_t *conn)
  3866. {
  3867. tor_assert(conn);
  3868. if (conn->marked_for_close)
  3869. return 0;
  3870. switch (conn->type)
  3871. {
  3872. case CONN_TYPE_OR:
  3873. return conn->state == OR_CONN_STATE_CONNECTING;
  3874. case CONN_TYPE_EXIT:
  3875. return conn->state == EXIT_CONN_STATE_CONNECTING;
  3876. case CONN_TYPE_DIR:
  3877. return conn->state == DIR_CONN_STATE_CONNECTING;
  3878. }
  3879. return 0;
  3880. }
  3881. /** Allocates a base64'ed authenticator for use in http or https
  3882. * auth, based on the input string <b>authenticator</b>. Returns it
  3883. * if success, else returns NULL. */
  3884. char *
  3885. alloc_http_authenticator(const char *authenticator)
  3886. {
  3887. /* an authenticator in Basic authentication
  3888. * is just the string "username:password" */
  3889. const size_t authenticator_length = strlen(authenticator);
  3890. /* The base64_encode function needs a minimum buffer length
  3891. * of 66 bytes. */
  3892. const size_t base64_authenticator_length = (authenticator_length/48+1)*66;
  3893. char *base64_authenticator = tor_malloc(base64_authenticator_length);
  3894. if (base64_encode(base64_authenticator, base64_authenticator_length,
  3895. authenticator, authenticator_length) < 0) {
  3896. tor_free(base64_authenticator); /* free and set to null */
  3897. } else {
  3898. int i = 0, j = 0;
  3899. ssize_t len = strlen(base64_authenticator);
  3900. /* remove all newline occurrences within the string */
  3901. for (i=0; i < len; ++i) {
  3902. if ('\n' != base64_authenticator[i]) {
  3903. base64_authenticator[j] = base64_authenticator[i];
  3904. ++j;
  3905. }
  3906. }
  3907. base64_authenticator[j]='\0';
  3908. }
  3909. return base64_authenticator;
  3910. }
  3911. /** Given a socket handle, check whether the local address (sockname) of the
  3912. * socket is one that we've connected from before. If so, double-check
  3913. * whether our address has changed and we need to generate keys. If we do,
  3914. * call init_keys().
  3915. */
  3916. static void
  3917. client_check_address_changed(tor_socket_t sock)
  3918. {
  3919. struct sockaddr_storage out_sockaddr;
  3920. socklen_t out_addr_len = (socklen_t) sizeof(out_sockaddr);
  3921. tor_addr_t out_addr, iface_addr;
  3922. tor_addr_t **last_interface_ip_ptr;
  3923. sa_family_t family;
  3924. if (!outgoing_addrs)
  3925. outgoing_addrs = smartlist_new();
  3926. if (getsockname(sock, (struct sockaddr*)&out_sockaddr, &out_addr_len)<0) {
  3927. int e = tor_socket_errno(sock);
  3928. log_warn(LD_NET, "getsockname() to check for address change failed: %s",
  3929. tor_socket_strerror(e));
  3930. return;
  3931. }
  3932. tor_addr_from_sockaddr(&out_addr, (struct sockaddr*)&out_sockaddr, NULL);
  3933. family = tor_addr_family(&out_addr);
  3934. if (family == AF_INET)
  3935. last_interface_ip_ptr = &last_interface_ipv4;
  3936. else if (family == AF_INET6)
  3937. last_interface_ip_ptr = &last_interface_ipv6;
  3938. else
  3939. return;
  3940. if (! *last_interface_ip_ptr) {
  3941. tor_addr_t *a = tor_malloc_zero(sizeof(tor_addr_t));
  3942. if (get_interface_address6(LOG_INFO, family, a)==0) {
  3943. *last_interface_ip_ptr = a;
  3944. } else {
  3945. tor_free(a);
  3946. }
  3947. }
  3948. /* If we've used this address previously, we're okay. */
  3949. SMARTLIST_FOREACH(outgoing_addrs, const tor_addr_t *, a_ptr,
  3950. if (tor_addr_eq(a_ptr, &out_addr))
  3951. return;
  3952. );
  3953. /* Uh-oh. We haven't connected from this address before. Has the interface
  3954. * address changed? */
  3955. if (get_interface_address6(LOG_INFO, family, &iface_addr)<0)
  3956. return;
  3957. if (tor_addr_eq(&iface_addr, *last_interface_ip_ptr)) {
  3958. /* Nope, it hasn't changed. Add this address to the list. */
  3959. smartlist_add(outgoing_addrs, tor_memdup(&out_addr, sizeof(tor_addr_t)));
  3960. } else {
  3961. /* The interface changed. We're a client, so we need to regenerate our
  3962. * keys. First, reset the state. */
  3963. log_notice(LD_NET, "Our IP address has changed. Rotating keys...");
  3964. tor_addr_copy(*last_interface_ip_ptr, &iface_addr);
  3965. SMARTLIST_FOREACH(outgoing_addrs, tor_addr_t*, a_ptr, tor_free(a_ptr));
  3966. smartlist_clear(outgoing_addrs);
  3967. smartlist_add(outgoing_addrs, tor_memdup(&out_addr, sizeof(tor_addr_t)));
  3968. /* We'll need to resolve ourselves again. */
  3969. reset_last_resolved_addr();
  3970. /* Okay, now change our keys. */
  3971. ip_address_changed(1);
  3972. }
  3973. }
  3974. /** Some systems have limited system buffers for recv and xmit on
  3975. * sockets allocated in a virtual server or similar environment. For a Tor
  3976. * server this can produce the "Error creating network socket: No buffer
  3977. * space available" error once all available TCP buffer space is consumed.
  3978. * This method will attempt to constrain the buffers allocated for the socket
  3979. * to the desired size to stay below system TCP buffer limits.
  3980. */
  3981. static void
  3982. set_constrained_socket_buffers(tor_socket_t sock, int size)
  3983. {
  3984. void *sz = (void*)&size;
  3985. socklen_t sz_sz = (socklen_t) sizeof(size);
  3986. if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, sz, sz_sz) < 0) {
  3987. int e = tor_socket_errno(sock);
  3988. log_warn(LD_NET, "setsockopt() to constrain send "
  3989. "buffer to %d bytes failed: %s", size, tor_socket_strerror(e));
  3990. }
  3991. if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, sz, sz_sz) < 0) {
  3992. int e = tor_socket_errno(sock);
  3993. log_warn(LD_NET, "setsockopt() to constrain recv "
  3994. "buffer to %d bytes failed: %s", size, tor_socket_strerror(e));
  3995. }
  3996. }
  3997. /** Process new bytes that have arrived on conn-\>inbuf.
  3998. *
  3999. * This function just passes conn to the connection-specific
  4000. * connection_*_process_inbuf() function. It also passes in
  4001. * package_partial if wanted.
  4002. */
  4003. static int
  4004. connection_process_inbuf(connection_t *conn, int package_partial)
  4005. {
  4006. tor_assert(conn);
  4007. switch (conn->type) {
  4008. case CONN_TYPE_OR:
  4009. return connection_or_process_inbuf(TO_OR_CONN(conn));
  4010. case CONN_TYPE_EXT_OR:
  4011. return connection_ext_or_process_inbuf(TO_OR_CONN(conn));
  4012. case CONN_TYPE_EXIT:
  4013. case CONN_TYPE_AP:
  4014. return connection_edge_process_inbuf(TO_EDGE_CONN(conn),
  4015. package_partial);
  4016. case CONN_TYPE_DIR:
  4017. return connection_dir_process_inbuf(TO_DIR_CONN(conn));
  4018. case CONN_TYPE_CPUWORKER:
  4019. return connection_cpu_process_inbuf(conn);
  4020. case CONN_TYPE_CONTROL:
  4021. return connection_control_process_inbuf(TO_CONTROL_CONN(conn));
  4022. default:
  4023. log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
  4024. tor_fragile_assert();
  4025. return -1;
  4026. }
  4027. }
  4028. /** Called whenever we've written data on a connection. */
  4029. static int
  4030. connection_flushed_some(connection_t *conn)
  4031. {
  4032. int r = 0;
  4033. tor_assert(!conn->in_flushed_some);
  4034. conn->in_flushed_some = 1;
  4035. if (conn->type == CONN_TYPE_DIR &&
  4036. conn->state == DIR_CONN_STATE_SERVER_WRITING) {
  4037. r = connection_dirserv_flushed_some(TO_DIR_CONN(conn));
  4038. } else if (conn->type == CONN_TYPE_OR) {
  4039. r = connection_or_flushed_some(TO_OR_CONN(conn));
  4040. } else if (CONN_IS_EDGE(conn)) {
  4041. r = connection_edge_flushed_some(TO_EDGE_CONN(conn));
  4042. }
  4043. conn->in_flushed_some = 0;
  4044. return r;
  4045. }
  4046. /** We just finished flushing bytes to the appropriately low network layer,
  4047. * and there are no more bytes remaining in conn-\>outbuf, conn-\>bev, or
  4048. * conn-\>tls to be flushed.
  4049. *
  4050. * This function just passes conn to the connection-specific
  4051. * connection_*_finished_flushing() function.
  4052. */
  4053. static int
  4054. connection_finished_flushing(connection_t *conn)
  4055. {
  4056. tor_assert(conn);
  4057. /* If the connection is closed, don't try to do anything more here. */
  4058. if (CONN_IS_CLOSED(conn))
  4059. return 0;
  4060. // log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
  4061. IF_HAS_NO_BUFFEREVENT(conn)
  4062. connection_stop_writing(conn);
  4063. switch (conn->type) {
  4064. case CONN_TYPE_OR:
  4065. return connection_or_finished_flushing(TO_OR_CONN(conn));
  4066. case CONN_TYPE_EXT_OR:
  4067. return connection_ext_or_finished_flushing(TO_OR_CONN(conn));
  4068. case CONN_TYPE_AP:
  4069. case CONN_TYPE_EXIT:
  4070. return connection_edge_finished_flushing(TO_EDGE_CONN(conn));
  4071. case CONN_TYPE_DIR:
  4072. return connection_dir_finished_flushing(TO_DIR_CONN(conn));
  4073. case CONN_TYPE_CPUWORKER:
  4074. return connection_cpu_finished_flushing(conn);
  4075. case CONN_TYPE_CONTROL:
  4076. return connection_control_finished_flushing(TO_CONTROL_CONN(conn));
  4077. default:
  4078. log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
  4079. tor_fragile_assert();
  4080. return -1;
  4081. }
  4082. }
  4083. /** Called when our attempt to connect() to another server has just
  4084. * succeeded.
  4085. *
  4086. * This function just passes conn to the connection-specific
  4087. * connection_*_finished_connecting() function.
  4088. */
  4089. static int
  4090. connection_finished_connecting(connection_t *conn)
  4091. {
  4092. tor_assert(conn);
  4093. if (!server_mode(get_options())) {
  4094. /* See whether getsockname() says our address changed. We need to do this
  4095. * now that the connection has finished, because getsockname() on Windows
  4096. * won't work until then. */
  4097. client_check_address_changed(conn->s);
  4098. }
  4099. switch (conn->type)
  4100. {
  4101. case CONN_TYPE_OR:
  4102. return connection_or_finished_connecting(TO_OR_CONN(conn));
  4103. case CONN_TYPE_EXIT:
  4104. return connection_edge_finished_connecting(TO_EDGE_CONN(conn));
  4105. case CONN_TYPE_DIR:
  4106. return connection_dir_finished_connecting(TO_DIR_CONN(conn));
  4107. default:
  4108. log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
  4109. tor_fragile_assert();
  4110. return -1;
  4111. }
  4112. }
  4113. /** Callback: invoked when a connection reaches an EOF event. */
  4114. static int
  4115. connection_reached_eof(connection_t *conn)
  4116. {
  4117. switch (conn->type) {
  4118. case CONN_TYPE_OR:
  4119. case CONN_TYPE_EXT_OR:
  4120. return connection_or_reached_eof(TO_OR_CONN(conn));
  4121. case CONN_TYPE_AP:
  4122. case CONN_TYPE_EXIT:
  4123. return connection_edge_reached_eof(TO_EDGE_CONN(conn));
  4124. case CONN_TYPE_DIR:
  4125. return connection_dir_reached_eof(TO_DIR_CONN(conn));
  4126. case CONN_TYPE_CPUWORKER:
  4127. return connection_cpu_reached_eof(conn);
  4128. case CONN_TYPE_CONTROL:
  4129. return connection_control_reached_eof(TO_CONTROL_CONN(conn));
  4130. default:
  4131. log_err(LD_BUG,"got unexpected conn type %d.", conn->type);
  4132. tor_fragile_assert();
  4133. return -1;
  4134. }
  4135. }
  4136. /** Log how many bytes are used by buffers of different kinds and sizes. */
  4137. void
  4138. connection_dump_buffer_mem_stats(int severity)
  4139. {
  4140. uint64_t used_by_type[CONN_TYPE_MAX_+1];
  4141. uint64_t alloc_by_type[CONN_TYPE_MAX_+1];
  4142. int n_conns_by_type[CONN_TYPE_MAX_+1];
  4143. uint64_t total_alloc = 0;
  4144. uint64_t total_used = 0;
  4145. int i;
  4146. smartlist_t *conns = get_connection_array();
  4147. memset(used_by_type, 0, sizeof(used_by_type));
  4148. memset(alloc_by_type, 0, sizeof(alloc_by_type));
  4149. memset(n_conns_by_type, 0, sizeof(n_conns_by_type));
  4150. SMARTLIST_FOREACH_BEGIN(conns, connection_t *, c) {
  4151. int tp = c->type;
  4152. ++n_conns_by_type[tp];
  4153. if (c->inbuf) {
  4154. used_by_type[tp] += buf_datalen(c->inbuf);
  4155. alloc_by_type[tp] += buf_allocation(c->inbuf);
  4156. }
  4157. if (c->outbuf) {
  4158. used_by_type[tp] += buf_datalen(c->outbuf);
  4159. alloc_by_type[tp] += buf_allocation(c->outbuf);
  4160. }
  4161. } SMARTLIST_FOREACH_END(c);
  4162. for (i=0; i <= CONN_TYPE_MAX_; ++i) {
  4163. total_used += used_by_type[i];
  4164. total_alloc += alloc_by_type[i];
  4165. }
  4166. tor_log(severity, LD_GENERAL,
  4167. "In buffers for %d connections: "U64_FORMAT" used/"U64_FORMAT" allocated",
  4168. smartlist_len(conns),
  4169. U64_PRINTF_ARG(total_used), U64_PRINTF_ARG(total_alloc));
  4170. for (i=CONN_TYPE_MIN_; i <= CONN_TYPE_MAX_; ++i) {
  4171. if (!n_conns_by_type[i])
  4172. continue;
  4173. tor_log(severity, LD_GENERAL,
  4174. " For %d %s connections: "U64_FORMAT" used/"U64_FORMAT" allocated",
  4175. n_conns_by_type[i], conn_type_to_string(i),
  4176. U64_PRINTF_ARG(used_by_type[i]), U64_PRINTF_ARG(alloc_by_type[i]));
  4177. }
  4178. }
  4179. /** Verify that connection <b>conn</b> has all of its invariants
  4180. * correct. Trigger an assert if anything is invalid.
  4181. */
  4182. void
  4183. assert_connection_ok(connection_t *conn, time_t now)
  4184. {
  4185. (void) now; /* XXXX unused. */
  4186. tor_assert(conn);
  4187. tor_assert(conn->type >= CONN_TYPE_MIN_);
  4188. tor_assert(conn->type <= CONN_TYPE_MAX_);
  4189. #ifdef USE_BUFFEREVENTS
  4190. if (conn->bufev) {
  4191. tor_assert(conn->read_event == NULL);
  4192. tor_assert(conn->write_event == NULL);
  4193. tor_assert(conn->inbuf == NULL);
  4194. tor_assert(conn->outbuf == NULL);
  4195. }
  4196. #endif
  4197. switch (conn->type) {
  4198. case CONN_TYPE_OR:
  4199. case CONN_TYPE_EXT_OR:
  4200. tor_assert(conn->magic == OR_CONNECTION_MAGIC);
  4201. break;
  4202. case CONN_TYPE_AP:
  4203. tor_assert(conn->magic == ENTRY_CONNECTION_MAGIC);
  4204. break;
  4205. case CONN_TYPE_EXIT:
  4206. tor_assert(conn->magic == EDGE_CONNECTION_MAGIC);
  4207. break;
  4208. case CONN_TYPE_DIR:
  4209. tor_assert(conn->magic == DIR_CONNECTION_MAGIC);
  4210. break;
  4211. case CONN_TYPE_CONTROL:
  4212. tor_assert(conn->magic == CONTROL_CONNECTION_MAGIC);
  4213. break;
  4214. CASE_ANY_LISTENER_TYPE:
  4215. tor_assert(conn->magic == LISTENER_CONNECTION_MAGIC);
  4216. break;
  4217. default:
  4218. tor_assert(conn->magic == BASE_CONNECTION_MAGIC);
  4219. break;
  4220. }
  4221. if (conn->linked_conn) {
  4222. tor_assert(conn->linked_conn->linked_conn == conn);
  4223. tor_assert(conn->linked);
  4224. }
  4225. if (conn->linked)
  4226. tor_assert(!SOCKET_OK(conn->s));
  4227. if (conn->outbuf_flushlen > 0) {
  4228. /* With optimistic data, we may have queued data in
  4229. * EXIT_CONN_STATE_RESOLVING while the conn is not yet marked to writing.
  4230. * */
  4231. tor_assert((conn->type == CONN_TYPE_EXIT &&
  4232. conn->state == EXIT_CONN_STATE_RESOLVING) ||
  4233. connection_is_writing(conn) ||
  4234. conn->write_blocked_on_bw ||
  4235. (CONN_IS_EDGE(conn) &&
  4236. TO_EDGE_CONN(conn)->edge_blocked_on_circ));
  4237. }
  4238. if (conn->hold_open_until_flushed)
  4239. tor_assert(conn->marked_for_close);
  4240. /* XXXX check: read_blocked_on_bw, write_blocked_on_bw, s, conn_array_index,
  4241. * marked_for_close. */
  4242. /* buffers */
  4243. if (conn->inbuf)
  4244. assert_buf_ok(conn->inbuf);
  4245. if (conn->outbuf)
  4246. assert_buf_ok(conn->outbuf);
  4247. if (conn->type == CONN_TYPE_OR) {
  4248. or_connection_t *or_conn = TO_OR_CONN(conn);
  4249. if (conn->state == OR_CONN_STATE_OPEN) {
  4250. /* tor_assert(conn->bandwidth > 0); */
  4251. /* the above isn't necessarily true: if we just did a TLS
  4252. * handshake but we didn't recognize the other peer, or it
  4253. * gave a bad cert/etc, then we won't have assigned bandwidth,
  4254. * yet it will be open. -RD
  4255. */
  4256. // tor_assert(conn->read_bucket >= 0);
  4257. }
  4258. // tor_assert(conn->addr && conn->port);
  4259. tor_assert(conn->address);
  4260. if (conn->state > OR_CONN_STATE_PROXY_HANDSHAKING)
  4261. tor_assert(or_conn->tls);
  4262. }
  4263. if (CONN_IS_EDGE(conn)) {
  4264. /* XXX unchecked: package window, deliver window. */
  4265. if (conn->type == CONN_TYPE_AP) {
  4266. entry_connection_t *entry_conn = TO_ENTRY_CONN(conn);
  4267. if (entry_conn->chosen_exit_optional || entry_conn->chosen_exit_retries)
  4268. tor_assert(entry_conn->chosen_exit_name);
  4269. tor_assert(entry_conn->socks_request);
  4270. if (conn->state == AP_CONN_STATE_OPEN) {
  4271. tor_assert(entry_conn->socks_request->has_finished);
  4272. if (!conn->marked_for_close) {
  4273. tor_assert(ENTRY_TO_EDGE_CONN(entry_conn)->cpath_layer);
  4274. assert_cpath_layer_ok(ENTRY_TO_EDGE_CONN(entry_conn)->cpath_layer);
  4275. }
  4276. }
  4277. }
  4278. if (conn->type == CONN_TYPE_EXIT) {
  4279. tor_assert(conn->purpose == EXIT_PURPOSE_CONNECT ||
  4280. conn->purpose == EXIT_PURPOSE_RESOLVE);
  4281. }
  4282. } else if (conn->type == CONN_TYPE_DIR) {
  4283. } else {
  4284. /* Purpose is only used for dir and exit types currently */
  4285. tor_assert(!conn->purpose);
  4286. }
  4287. switch (conn->type)
  4288. {
  4289. CASE_ANY_LISTENER_TYPE:
  4290. tor_assert(conn->state == LISTENER_STATE_READY);
  4291. break;
  4292. case CONN_TYPE_OR:
  4293. tor_assert(conn->state >= OR_CONN_STATE_MIN_);
  4294. tor_assert(conn->state <= OR_CONN_STATE_MAX_);
  4295. break;
  4296. case CONN_TYPE_EXT_OR:
  4297. tor_assert(conn->state >= EXT_OR_CONN_STATE_MIN_);
  4298. tor_assert(conn->state <= EXT_OR_CONN_STATE_MAX_);
  4299. break;
  4300. case CONN_TYPE_EXIT:
  4301. tor_assert(conn->state >= EXIT_CONN_STATE_MIN_);
  4302. tor_assert(conn->state <= EXIT_CONN_STATE_MAX_);
  4303. tor_assert(conn->purpose >= EXIT_PURPOSE_MIN_);
  4304. tor_assert(conn->purpose <= EXIT_PURPOSE_MAX_);
  4305. break;
  4306. case CONN_TYPE_AP:
  4307. tor_assert(conn->state >= AP_CONN_STATE_MIN_);
  4308. tor_assert(conn->state <= AP_CONN_STATE_MAX_);
  4309. tor_assert(TO_ENTRY_CONN(conn)->socks_request);
  4310. break;
  4311. case CONN_TYPE_DIR:
  4312. tor_assert(conn->state >= DIR_CONN_STATE_MIN_);
  4313. tor_assert(conn->state <= DIR_CONN_STATE_MAX_);
  4314. tor_assert(conn->purpose >= DIR_PURPOSE_MIN_);
  4315. tor_assert(conn->purpose <= DIR_PURPOSE_MAX_);
  4316. break;
  4317. case CONN_TYPE_CPUWORKER:
  4318. tor_assert(conn->state >= CPUWORKER_STATE_MIN_);
  4319. tor_assert(conn->state <= CPUWORKER_STATE_MAX_);
  4320. break;
  4321. case CONN_TYPE_CONTROL:
  4322. tor_assert(conn->state >= CONTROL_CONN_STATE_MIN_);
  4323. tor_assert(conn->state <= CONTROL_CONN_STATE_MAX_);
  4324. break;
  4325. default:
  4326. tor_assert(0);
  4327. }
  4328. }
  4329. /** Fills <b>addr</b> and <b>port</b> with the details of the global
  4330. * proxy server we are using.
  4331. * <b>conn</b> contains the connection we are using the proxy for.
  4332. *
  4333. * Return 0 on success, -1 on failure.
  4334. */
  4335. int
  4336. get_proxy_addrport(tor_addr_t *addr, uint16_t *port, int *proxy_type,
  4337. const connection_t *conn)
  4338. {
  4339. const or_options_t *options = get_options();
  4340. /* Client Transport Plugins can use another proxy, but that should be hidden
  4341. * from the rest of tor (as the plugin is responsible for dealing with the
  4342. * proxy), check it first, then check the rest of the proxy types to allow
  4343. * the config to have unused ClientTransportPlugin entries.
  4344. */
  4345. if (options->ClientTransportPlugin) {
  4346. const transport_t *transport = NULL;
  4347. int r;
  4348. r = get_transport_by_bridge_addrport(&conn->addr, conn->port, &transport);
  4349. if (r<0)
  4350. return -1;
  4351. if (transport) { /* transport found */
  4352. tor_addr_copy(addr, &transport->addr);
  4353. *port = transport->port;
  4354. *proxy_type = transport->socks_version;
  4355. return 0;
  4356. }
  4357. /* Unused ClientTransportPlugin. */
  4358. }
  4359. if (options->HTTPSProxy) {
  4360. tor_addr_copy(addr, &options->HTTPSProxyAddr);
  4361. *port = options->HTTPSProxyPort;
  4362. *proxy_type = PROXY_CONNECT;
  4363. return 0;
  4364. } else if (options->Socks4Proxy) {
  4365. tor_addr_copy(addr, &options->Socks4ProxyAddr);
  4366. *port = options->Socks4ProxyPort;
  4367. *proxy_type = PROXY_SOCKS4;
  4368. return 0;
  4369. } else if (options->Socks5Proxy) {
  4370. tor_addr_copy(addr, &options->Socks5ProxyAddr);
  4371. *port = options->Socks5ProxyPort;
  4372. *proxy_type = PROXY_SOCKS5;
  4373. return 0;
  4374. }
  4375. tor_addr_make_unspec(addr);
  4376. *port = 0;
  4377. *proxy_type = PROXY_NONE;
  4378. return 0;
  4379. }
  4380. /** Log a failed connection to a proxy server.
  4381. * <b>conn</b> is the connection we use the proxy server for. */
  4382. void
  4383. log_failed_proxy_connection(connection_t *conn)
  4384. {
  4385. tor_addr_t proxy_addr;
  4386. uint16_t proxy_port;
  4387. int proxy_type;
  4388. if (get_proxy_addrport(&proxy_addr, &proxy_port, &proxy_type, conn) != 0)
  4389. return; /* if we have no proxy set up, leave this function. */
  4390. log_warn(LD_NET,
  4391. "The connection to the %s proxy server at %s just failed. "
  4392. "Make sure that the proxy server is up and running.",
  4393. proxy_type_to_string(proxy_type),
  4394. fmt_addrport(&proxy_addr, proxy_port));
  4395. }
  4396. /** Return string representation of <b>proxy_type</b>. */
  4397. static const char *
  4398. proxy_type_to_string(int proxy_type)
  4399. {
  4400. switch (proxy_type) {
  4401. case PROXY_CONNECT: return "HTTP";
  4402. case PROXY_SOCKS4: return "SOCKS4";
  4403. case PROXY_SOCKS5: return "SOCKS5";
  4404. case PROXY_PLUGGABLE: return "pluggable transports SOCKS";
  4405. case PROXY_NONE: return "NULL";
  4406. default: tor_assert(0);
  4407. }
  4408. return NULL; /*Unreached*/
  4409. }
  4410. /** Call connection_free_() on every connection in our array, and release all
  4411. * storage held by connection.c. This is used by cpuworkers and dnsworkers
  4412. * when they fork, so they don't keep resources held open (especially
  4413. * sockets).
  4414. *
  4415. * Don't do the checks in connection_free(), because they will
  4416. * fail.
  4417. */
  4418. void
  4419. connection_free_all(void)
  4420. {
  4421. smartlist_t *conns = get_connection_array();
  4422. /* We don't want to log any messages to controllers. */
  4423. SMARTLIST_FOREACH(conns, connection_t *, conn,
  4424. if (conn->type == CONN_TYPE_CONTROL)
  4425. TO_CONTROL_CONN(conn)->event_mask = 0);
  4426. control_update_global_event_mask();
  4427. /* Unlink everything from the identity map. */
  4428. connection_or_clear_identity_map();
  4429. connection_or_clear_ext_or_id_map();
  4430. /* Clear out our list of broken connections */
  4431. clear_broken_connection_map(0);
  4432. SMARTLIST_FOREACH(conns, connection_t *, conn, connection_free_(conn));
  4433. if (outgoing_addrs) {
  4434. SMARTLIST_FOREACH(outgoing_addrs, tor_addr_t *, addr, tor_free(addr));
  4435. smartlist_free(outgoing_addrs);
  4436. outgoing_addrs = NULL;
  4437. }
  4438. tor_free(last_interface_ipv4);
  4439. tor_free(last_interface_ipv6);
  4440. #ifdef USE_BUFFEREVENTS
  4441. if (global_rate_limit)
  4442. bufferevent_rate_limit_group_free(global_rate_limit);
  4443. #endif
  4444. }