main.c 80 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970197119721973197419751976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030203120322033203420352036203720382039204020412042204320442045204620472048204920502051205220532054205520562057205820592060206120622063206420652066206720682069207020712072207320742075207620772078207920802081208220832084208520862087208820892090209120922093209420952096209720982099210021012102210321042105210621072108210921102111211221132114211521162117211821192120212121222123212421252126212721282129213021312132213321342135213621372138213921402141214221432144214521462147214821492150215121522153215421552156215721582159216021612162216321642165216621672168216921702171217221732174217521762177217821792180218121822183218421852186218721882189219021912192219321942195219621972198219922002201220222032204220522062207220822092210221122122213221422152216221722182219222022212222222322242225222622272228222922302231223222332234223522362237223822392240224122422243224422452246224722482249225022512252225322542255225622572258225922602261226222632264226522662267226822692270227122722273227422752276227722782279228022812282228322842285228622872288228922902291229222932294229522962297229822992300230123022303230423052306230723082309231023112312231323142315231623172318231923202321232223232324232523262327232823292330233123322333233423352336233723382339234023412342234323442345234623472348234923502351235223532354235523562357235823592360236123622363236423652366236723682369237023712372237323742375237623772378237923802381238223832384238523862387238823892390239123922393239423952396239723982399240024012402240324042405240624072408240924102411241224132414241524162417241824192420242124222423242424252426242724282429243024312432243324342435243624372438
  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) 2007-2010, The Tor Project, Inc. */
  5. /* See LICENSE for licensing information */
  6. /**
  7. * \file main.c
  8. * \brief Toplevel module. Handles signals, multiplexes between
  9. * connections, implements main loop, and drives scheduled events.
  10. **/
  11. #define MAIN_PRIVATE
  12. #include "or.h"
  13. #include "buffers.h"
  14. #include "circuitbuild.h"
  15. #include "circuitlist.h"
  16. #include "circuituse.h"
  17. #include "command.h"
  18. #include "config.h"
  19. #include "connection.h"
  20. #include "connection_edge.h"
  21. #include "connection_or.h"
  22. #include "control.h"
  23. #include "cpuworker.h"
  24. #include "directory.h"
  25. #include "dirserv.h"
  26. #include "dirvote.h"
  27. #include "dns.h"
  28. #include "dnsserv.h"
  29. #include "geoip.h"
  30. #include "hibernate.h"
  31. #include "main.h"
  32. #include "microdesc.h"
  33. #include "networkstatus.h"
  34. #include "nodelist.h"
  35. #include "ntmain.h"
  36. #include "onion.h"
  37. #include "policies.h"
  38. #include "relay.h"
  39. #include "rendclient.h"
  40. #include "rendcommon.h"
  41. #include "rendservice.h"
  42. #include "rephist.h"
  43. #include "router.h"
  44. #include "routerlist.h"
  45. #include "routerparse.h"
  46. #ifdef USE_DMALLOC
  47. #include <dmalloc.h>
  48. #include <openssl/crypto.h>
  49. #endif
  50. #include "memarea.h"
  51. #ifdef HAVE_EVENT2_EVENT_H
  52. #include <event2/event.h>
  53. #else
  54. #include <event.h>
  55. #endif
  56. #ifdef USE_BUFFEREVENTS
  57. #include <event2/bufferevent.h>
  58. #endif
  59. void evdns_shutdown(int);
  60. /********* PROTOTYPES **********/
  61. static void dumpmemusage(int severity);
  62. static void dumpstats(int severity); /* log stats */
  63. static void conn_read_callback(int fd, short event, void *_conn);
  64. static void conn_write_callback(int fd, short event, void *_conn);
  65. static void signal_callback(int fd, short events, void *arg);
  66. static void second_elapsed_callback(periodic_timer_t *timer, void *args);
  67. static int conn_close_if_marked(int i);
  68. static void connection_start_reading_from_linked_conn(connection_t *conn);
  69. static int connection_should_read_from_linked_conn(connection_t *conn);
  70. /********* START VARIABLES **********/
  71. #ifndef USE_BUFFEREVENTS
  72. int global_read_bucket; /**< Max number of bytes I can read this second. */
  73. int global_write_bucket; /**< Max number of bytes I can write this second. */
  74. /** Max number of relayed (bandwidth class 1) bytes I can read this second. */
  75. int global_relayed_read_bucket;
  76. /** Max number of relayed (bandwidth class 1) bytes I can write this second. */
  77. int global_relayed_write_bucket;
  78. /** What was the read bucket before the last second_elapsed_callback() call?
  79. * (used to determine how many bytes we've read). */
  80. static int stats_prev_global_read_bucket;
  81. /** What was the write bucket before the last second_elapsed_callback() call?
  82. * (used to determine how many bytes we've written). */
  83. static int stats_prev_global_write_bucket;
  84. #else
  85. static uint64_t stats_prev_n_read = 0;
  86. static uint64_t stats_prev_n_written = 0;
  87. #endif
  88. /* XXX we might want to keep stats about global_relayed_*_bucket too. Or not.*/
  89. /** How many bytes have we read since we started the process? */
  90. static uint64_t stats_n_bytes_read = 0;
  91. /** How many bytes have we written since we started the process? */
  92. static uint64_t stats_n_bytes_written = 0;
  93. /** What time did this process start up? */
  94. time_t time_of_process_start = 0;
  95. /** How many seconds have we been running? */
  96. long stats_n_seconds_working = 0;
  97. /** When do we next launch DNS wildcarding checks? */
  98. static time_t time_to_check_for_correct_dns = 0;
  99. /** How often will we honor SIGNEWNYM requests? */
  100. #define MAX_SIGNEWNYM_RATE 10
  101. /** When did we last process a SIGNEWNYM request? */
  102. static time_t time_of_last_signewnym = 0;
  103. /** Is there a signewnym request we're currently waiting to handle? */
  104. static int signewnym_is_pending = 0;
  105. /** Smartlist of all open connections. */
  106. static smartlist_t *connection_array = NULL;
  107. /** List of connections that have been marked for close and need to be freed
  108. * and removed from connection_array. */
  109. static smartlist_t *closeable_connection_lst = NULL;
  110. /** List of linked connections that are currently reading data into their
  111. * inbuf from their partner's outbuf. */
  112. static smartlist_t *active_linked_connection_lst = NULL;
  113. /** Flag: Set to true iff we entered the current libevent main loop via
  114. * <b>loop_once</b>. If so, there's no need to trigger a loopexit in order
  115. * to handle linked connections. */
  116. static int called_loop_once = 0;
  117. /** We set this to 1 when we've opened a circuit, so we can print a log
  118. * entry to inform the user that Tor is working. We set it to 0 when
  119. * we think the fact that we once opened a circuit doesn't mean we can do so
  120. * any longer (a big time jump happened, when we notice our directory is
  121. * heinously out-of-date, etc.
  122. */
  123. int can_complete_circuit=0;
  124. /** How often do we check for router descriptors that we should download
  125. * when we have too little directory info? */
  126. #define GREEDY_DESCRIPTOR_RETRY_INTERVAL (10)
  127. /** How often do we check for router descriptors that we should download
  128. * when we have enough directory info? */
  129. #define LAZY_DESCRIPTOR_RETRY_INTERVAL (60)
  130. /** How often do we 'forgive' undownloadable router descriptors and attempt
  131. * to download them again? */
  132. #define DESCRIPTOR_FAILURE_RESET_INTERVAL (60*60)
  133. /** How long do we let a directory connection stall before expiring it? */
  134. #define DIR_CONN_MAX_STALL (5*60)
  135. /** How long do we let OR connections handshake before we decide that
  136. * they are obsolete? */
  137. #define TLS_HANDSHAKE_TIMEOUT (60)
  138. /********* END VARIABLES ************/
  139. /****************************************************************************
  140. *
  141. * This section contains accessors and other methods on the connection_array
  142. * variables (which are global within this file and unavailable outside it).
  143. *
  144. ****************************************************************************/
  145. #if 0 && defined(USE_BUFFEREVENTS)
  146. static void
  147. free_old_inbuf(connection_t *conn)
  148. {
  149. if (! conn->inbuf)
  150. return;
  151. tor_assert(conn->outbuf);
  152. tor_assert(buf_datalen(conn->inbuf) == 0);
  153. tor_assert(buf_datalen(conn->outbuf) == 0);
  154. buf_free(conn->inbuf);
  155. buf_free(conn->outbuf);
  156. conn->inbuf = conn->outbuf = NULL;
  157. if (conn->read_event) {
  158. event_del(conn->read_event);
  159. tor_event_free(conn->read_event);
  160. }
  161. if (conn->write_event) {
  162. event_del(conn->read_event);
  163. tor_event_free(conn->write_event);
  164. }
  165. conn->read_event = conn->write_event = NULL;
  166. }
  167. #endif
  168. /** Add <b>conn</b> to the array of connections that we can poll on. The
  169. * connection's socket must be set; the connection starts out
  170. * non-reading and non-writing.
  171. */
  172. int
  173. connection_add_impl(connection_t *conn, int is_connecting)
  174. {
  175. tor_assert(conn);
  176. tor_assert(conn->s >= 0 ||
  177. conn->linked ||
  178. (conn->type == CONN_TYPE_AP &&
  179. TO_EDGE_CONN(conn)->is_dns_request));
  180. tor_assert(conn->conn_array_index == -1); /* can only connection_add once */
  181. conn->conn_array_index = smartlist_len(connection_array);
  182. smartlist_add(connection_array, conn);
  183. #ifdef USE_BUFFEREVENTS
  184. if (connection_type_uses_bufferevent(conn)) {
  185. if (conn->s >= 0 && !conn->linked) {
  186. conn->bufev = bufferevent_socket_new(
  187. tor_libevent_get_base(),
  188. conn->s,
  189. BEV_OPT_DEFER_CALLBACKS);
  190. if (!conn->bufev) {
  191. log_warn(LD_BUG, "Unable to create socket bufferevent");
  192. smartlist_del(connection_array, conn->conn_array_index);
  193. conn->conn_array_index = -1;
  194. return -1;
  195. }
  196. if (is_connecting) {
  197. /* Put the bufferevent into a "connecting" state so that we'll get
  198. * a "connected" event callback on successful write. */
  199. bufferevent_socket_connect(conn->bufev, NULL, 0);
  200. }
  201. connection_configure_bufferevent_callbacks(conn);
  202. } else if (conn->linked && conn->linked_conn &&
  203. connection_type_uses_bufferevent(conn->linked_conn)) {
  204. tor_assert(conn->s < 0);
  205. if (!conn->bufev) {
  206. struct bufferevent *pair[2] = { NULL, NULL };
  207. if (bufferevent_pair_new(tor_libevent_get_base(),
  208. BEV_OPT_DEFER_CALLBACKS,
  209. pair) < 0) {
  210. log_warn(LD_BUG, "Unable to create bufferevent pair");
  211. smartlist_del(connection_array, conn->conn_array_index);
  212. conn->conn_array_index = -1;
  213. return -1;
  214. }
  215. tor_assert(pair[0]);
  216. conn->bufev = pair[0];
  217. conn->linked_conn->bufev = pair[1];
  218. } /* else the other side already was added, and got a bufferevent_pair */
  219. connection_configure_bufferevent_callbacks(conn);
  220. } else {
  221. tor_assert(!conn->linked);
  222. }
  223. if (conn->bufev)
  224. tor_assert(conn->inbuf == NULL);
  225. if (conn->linked_conn && conn->linked_conn->bufev)
  226. tor_assert(conn->linked_conn->inbuf == NULL);
  227. }
  228. #else
  229. (void) is_connecting;
  230. #endif
  231. if (!HAS_BUFFEREVENT(conn) && (conn->s >= 0 || conn->linked)) {
  232. conn->read_event = tor_event_new(tor_libevent_get_base(),
  233. conn->s, EV_READ|EV_PERSIST, conn_read_callback, conn);
  234. conn->write_event = tor_event_new(tor_libevent_get_base(),
  235. conn->s, EV_WRITE|EV_PERSIST, conn_write_callback, conn);
  236. /* XXXX CHECK FOR NULL RETURN! */
  237. }
  238. log_debug(LD_NET,"new conn type %s, socket %d, address %s, n_conns %d.",
  239. conn_type_to_string(conn->type), conn->s, conn->address,
  240. smartlist_len(connection_array));
  241. return 0;
  242. }
  243. /** Tell libevent that we don't care about <b>conn</b> any more. */
  244. void
  245. connection_unregister_events(connection_t *conn)
  246. {
  247. if (conn->read_event) {
  248. if (event_del(conn->read_event))
  249. log_warn(LD_BUG, "Error removing read event for %d", conn->s);
  250. tor_free(conn->read_event);
  251. }
  252. if (conn->write_event) {
  253. if (event_del(conn->write_event))
  254. log_warn(LD_BUG, "Error removing write event for %d", conn->s);
  255. tor_free(conn->write_event);
  256. }
  257. #ifdef USE_BUFFEREVENTS
  258. if (conn->bufev) {
  259. bufferevent_free(conn->bufev);
  260. conn->bufev = NULL;
  261. }
  262. #endif
  263. if (conn->dns_server_port) {
  264. dnsserv_close_listener(conn);
  265. }
  266. }
  267. /** Remove the connection from the global list, and remove the
  268. * corresponding poll entry. Calling this function will shift the last
  269. * connection (if any) into the position occupied by conn.
  270. */
  271. int
  272. connection_remove(connection_t *conn)
  273. {
  274. int current_index;
  275. connection_t *tmp;
  276. tor_assert(conn);
  277. log_debug(LD_NET,"removing socket %d (type %s), n_conns now %d",
  278. conn->s, conn_type_to_string(conn->type),
  279. smartlist_len(connection_array));
  280. tor_assert(conn->conn_array_index >= 0);
  281. current_index = conn->conn_array_index;
  282. connection_unregister_events(conn); /* This is redundant, but cheap. */
  283. if (current_index == smartlist_len(connection_array)-1) { /* at the end */
  284. smartlist_del(connection_array, current_index);
  285. return 0;
  286. }
  287. /* replace this one with the one at the end */
  288. smartlist_del(connection_array, current_index);
  289. tmp = smartlist_get(connection_array, current_index);
  290. tmp->conn_array_index = current_index;
  291. return 0;
  292. }
  293. /** If <b>conn</b> is an edge conn, remove it from the list
  294. * of conn's on this circuit. If it's not on an edge,
  295. * flush and send destroys for all circuits on this conn.
  296. *
  297. * Remove it from connection_array (if applicable) and
  298. * from closeable_connection_list.
  299. *
  300. * Then free it.
  301. */
  302. static void
  303. connection_unlink(connection_t *conn)
  304. {
  305. connection_about_to_close_connection(conn);
  306. if (conn->conn_array_index >= 0) {
  307. connection_remove(conn);
  308. }
  309. if (conn->linked_conn) {
  310. conn->linked_conn->linked_conn = NULL;
  311. if (! conn->linked_conn->marked_for_close &&
  312. conn->linked_conn->reading_from_linked_conn)
  313. connection_start_reading(conn->linked_conn);
  314. conn->linked_conn = NULL;
  315. }
  316. smartlist_remove(closeable_connection_lst, conn);
  317. smartlist_remove(active_linked_connection_lst, conn);
  318. if (conn->type == CONN_TYPE_EXIT) {
  319. assert_connection_edge_not_dns_pending(TO_EDGE_CONN(conn));
  320. }
  321. if (conn->type == CONN_TYPE_OR) {
  322. if (!tor_digest_is_zero(TO_OR_CONN(conn)->identity_digest))
  323. connection_or_remove_from_identity_map(TO_OR_CONN(conn));
  324. }
  325. connection_free(conn);
  326. }
  327. /** Schedule <b>conn</b> to be closed. **/
  328. void
  329. add_connection_to_closeable_list(connection_t *conn)
  330. {
  331. tor_assert(!smartlist_isin(closeable_connection_lst, conn));
  332. tor_assert(conn->marked_for_close);
  333. assert_connection_ok(conn, time(NULL));
  334. smartlist_add(closeable_connection_lst, conn);
  335. }
  336. /** Return 1 if conn is on the closeable list, else return 0. */
  337. int
  338. connection_is_on_closeable_list(connection_t *conn)
  339. {
  340. return smartlist_isin(closeable_connection_lst, conn);
  341. }
  342. /** Return true iff conn is in the current poll array. */
  343. int
  344. connection_in_array(connection_t *conn)
  345. {
  346. return smartlist_isin(connection_array, conn);
  347. }
  348. /** Set <b>*array</b> to an array of all connections, and <b>*n</b>
  349. * to the length of the array. <b>*array</b> and <b>*n</b> must not
  350. * be modified.
  351. */
  352. smartlist_t *
  353. get_connection_array(void)
  354. {
  355. if (!connection_array)
  356. connection_array = smartlist_create();
  357. return connection_array;
  358. }
  359. /** Set the event mask on <b>conn</b> to <b>events</b>. (The event
  360. * mask is a bitmask whose bits are READ_EVENT and WRITE_EVENT)
  361. */
  362. void
  363. connection_watch_events(connection_t *conn, watchable_events_t events)
  364. {
  365. IF_HAS_BUFFEREVENT(conn, {
  366. short ev = ((short)events) & (EV_READ|EV_WRITE);
  367. short old_ev = bufferevent_get_enabled(conn->bufev);
  368. if ((ev & ~old_ev) != 0) {
  369. bufferevent_enable(conn->bufev, ev);
  370. }
  371. if ((old_ev & ~ev) != 0) {
  372. bufferevent_disable(conn->bufev, old_ev & ~ev);
  373. }
  374. return;
  375. });
  376. if (events & READ_EVENT)
  377. connection_start_reading(conn);
  378. else
  379. connection_stop_reading(conn);
  380. if (events & WRITE_EVENT)
  381. connection_start_writing(conn);
  382. else
  383. connection_stop_writing(conn);
  384. }
  385. /** Return true iff <b>conn</b> is listening for read events. */
  386. int
  387. connection_is_reading(connection_t *conn)
  388. {
  389. tor_assert(conn);
  390. IF_HAS_BUFFEREVENT(conn,
  391. return (bufferevent_get_enabled(conn->bufev) & EV_READ) != 0;
  392. );
  393. return conn->reading_from_linked_conn ||
  394. (conn->read_event && event_pending(conn->read_event, EV_READ, NULL));
  395. }
  396. /** Tell the main loop to stop notifying <b>conn</b> of any read events. */
  397. void
  398. connection_stop_reading(connection_t *conn)
  399. {
  400. tor_assert(conn);
  401. IF_HAS_BUFFEREVENT(conn, {
  402. bufferevent_disable(conn->bufev, EV_READ);
  403. return;
  404. });
  405. tor_assert(conn->read_event);
  406. if (conn->linked) {
  407. conn->reading_from_linked_conn = 0;
  408. connection_stop_reading_from_linked_conn(conn);
  409. } else {
  410. if (event_del(conn->read_event))
  411. log_warn(LD_NET, "Error from libevent setting read event state for %d "
  412. "to unwatched: %s",
  413. conn->s,
  414. tor_socket_strerror(tor_socket_errno(conn->s)));
  415. }
  416. }
  417. /** Tell the main loop to start notifying <b>conn</b> of any read events. */
  418. void
  419. connection_start_reading(connection_t *conn)
  420. {
  421. tor_assert(conn);
  422. IF_HAS_BUFFEREVENT(conn, {
  423. bufferevent_enable(conn->bufev, EV_READ);
  424. return;
  425. });
  426. tor_assert(conn->read_event);
  427. if (conn->linked) {
  428. conn->reading_from_linked_conn = 1;
  429. if (connection_should_read_from_linked_conn(conn))
  430. connection_start_reading_from_linked_conn(conn);
  431. } else {
  432. if (event_add(conn->read_event, NULL))
  433. log_warn(LD_NET, "Error from libevent setting read event state for %d "
  434. "to watched: %s",
  435. conn->s,
  436. tor_socket_strerror(tor_socket_errno(conn->s)));
  437. }
  438. }
  439. /** Return true iff <b>conn</b> is listening for write events. */
  440. int
  441. connection_is_writing(connection_t *conn)
  442. {
  443. tor_assert(conn);
  444. IF_HAS_BUFFEREVENT(conn,
  445. return (bufferevent_get_enabled(conn->bufev) & EV_WRITE) != 0;
  446. );
  447. return conn->writing_to_linked_conn ||
  448. (conn->write_event && event_pending(conn->write_event, EV_WRITE, NULL));
  449. }
  450. /** Tell the main loop to stop notifying <b>conn</b> of any write events. */
  451. void
  452. connection_stop_writing(connection_t *conn)
  453. {
  454. tor_assert(conn);
  455. IF_HAS_BUFFEREVENT(conn, {
  456. bufferevent_disable(conn->bufev, EV_WRITE);
  457. return;
  458. });
  459. tor_assert(conn->write_event);
  460. if (conn->linked) {
  461. conn->writing_to_linked_conn = 0;
  462. if (conn->linked_conn)
  463. connection_stop_reading_from_linked_conn(conn->linked_conn);
  464. } else {
  465. if (event_del(conn->write_event))
  466. log_warn(LD_NET, "Error from libevent setting write event state for %d "
  467. "to unwatched: %s",
  468. conn->s,
  469. tor_socket_strerror(tor_socket_errno(conn->s)));
  470. }
  471. }
  472. /** Tell the main loop to start notifying <b>conn</b> of any write events. */
  473. void
  474. connection_start_writing(connection_t *conn)
  475. {
  476. tor_assert(conn);
  477. IF_HAS_BUFFEREVENT(conn, {
  478. bufferevent_enable(conn->bufev, EV_WRITE);
  479. return;
  480. });
  481. tor_assert(conn->write_event);
  482. if (conn->linked) {
  483. conn->writing_to_linked_conn = 1;
  484. if (conn->linked_conn &&
  485. connection_should_read_from_linked_conn(conn->linked_conn))
  486. connection_start_reading_from_linked_conn(conn->linked_conn);
  487. } else {
  488. if (event_add(conn->write_event, NULL))
  489. log_warn(LD_NET, "Error from libevent setting write event state for %d "
  490. "to watched: %s",
  491. conn->s,
  492. tor_socket_strerror(tor_socket_errno(conn->s)));
  493. }
  494. }
  495. /** Return true iff <b>conn</b> is linked conn, and reading from the conn
  496. * linked to it would be good and feasible. (Reading is "feasible" if the
  497. * other conn exists and has data in its outbuf, and is "good" if we have our
  498. * reading_from_linked_conn flag set and the other conn has its
  499. * writing_to_linked_conn flag set.)*/
  500. static int
  501. connection_should_read_from_linked_conn(connection_t *conn)
  502. {
  503. if (conn->linked && conn->reading_from_linked_conn) {
  504. if (! conn->linked_conn ||
  505. (conn->linked_conn->writing_to_linked_conn &&
  506. buf_datalen(conn->linked_conn->outbuf)))
  507. return 1;
  508. }
  509. return 0;
  510. }
  511. /** Helper: Tell the main loop to begin reading bytes into <b>conn</b> from
  512. * its linked connection, if it is not doing so already. Called by
  513. * connection_start_reading and connection_start_writing as appropriate. */
  514. static void
  515. connection_start_reading_from_linked_conn(connection_t *conn)
  516. {
  517. tor_assert(conn);
  518. tor_assert(conn->linked == 1);
  519. if (!conn->active_on_link) {
  520. conn->active_on_link = 1;
  521. smartlist_add(active_linked_connection_lst, conn);
  522. if (!called_loop_once) {
  523. /* This is the first event on the list; we won't be in LOOP_ONCE mode,
  524. * so we need to make sure that the event_base_loop() actually exits at
  525. * the end of its run through the current connections and lets us
  526. * activate read events for linked connections. */
  527. struct timeval tv = { 0, 0 };
  528. tor_event_base_loopexit(tor_libevent_get_base(), &tv);
  529. }
  530. } else {
  531. tor_assert(smartlist_isin(active_linked_connection_lst, conn));
  532. }
  533. }
  534. /** Tell the main loop to stop reading bytes into <b>conn</b> from its linked
  535. * connection, if is currently doing so. Called by connection_stop_reading,
  536. * connection_stop_writing, and connection_read. */
  537. void
  538. connection_stop_reading_from_linked_conn(connection_t *conn)
  539. {
  540. tor_assert(conn);
  541. tor_assert(conn->linked == 1);
  542. if (conn->active_on_link) {
  543. conn->active_on_link = 0;
  544. /* FFFF We could keep an index here so we can smartlist_del
  545. * cleanly. On the other hand, this doesn't show up on profiles,
  546. * so let's leave it alone for now. */
  547. smartlist_remove(active_linked_connection_lst, conn);
  548. } else {
  549. tor_assert(!smartlist_isin(active_linked_connection_lst, conn));
  550. }
  551. }
  552. /** Close all connections that have been scheduled to get closed. */
  553. static void
  554. close_closeable_connections(void)
  555. {
  556. int i;
  557. for (i = 0; i < smartlist_len(closeable_connection_lst); ) {
  558. connection_t *conn = smartlist_get(closeable_connection_lst, i);
  559. if (conn->conn_array_index < 0) {
  560. connection_unlink(conn); /* blow it away right now */
  561. } else {
  562. if (!conn_close_if_marked(conn->conn_array_index))
  563. ++i;
  564. }
  565. }
  566. }
  567. /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
  568. * some data to read. */
  569. static void
  570. conn_read_callback(int fd, short event, void *_conn)
  571. {
  572. connection_t *conn = _conn;
  573. (void)fd;
  574. (void)event;
  575. log_debug(LD_NET,"socket %d wants to read.",conn->s);
  576. /* assert_connection_ok(conn, time(NULL)); */
  577. if (connection_handle_read(conn) < 0) {
  578. if (!conn->marked_for_close) {
  579. #ifndef MS_WINDOWS
  580. log_warn(LD_BUG,"Unhandled error on read for %s connection "
  581. "(fd %d); removing",
  582. conn_type_to_string(conn->type), conn->s);
  583. tor_fragile_assert();
  584. #endif
  585. if (CONN_IS_EDGE(conn))
  586. connection_edge_end_errno(TO_EDGE_CONN(conn));
  587. connection_mark_for_close(conn);
  588. }
  589. }
  590. assert_connection_ok(conn, time(NULL));
  591. if (smartlist_len(closeable_connection_lst))
  592. close_closeable_connections();
  593. }
  594. /** Libevent callback: this gets invoked when (connection_t*)<b>conn</b> has
  595. * some data to write. */
  596. static void
  597. conn_write_callback(int fd, short events, void *_conn)
  598. {
  599. connection_t *conn = _conn;
  600. (void)fd;
  601. (void)events;
  602. LOG_FN_CONN(conn, (LOG_DEBUG, LD_NET, "socket %d wants to write.",conn->s));
  603. /* assert_connection_ok(conn, time(NULL)); */
  604. if (connection_handle_write(conn, 0) < 0) {
  605. if (!conn->marked_for_close) {
  606. /* this connection is broken. remove it. */
  607. log_fn(LOG_WARN,LD_BUG,
  608. "unhandled error on write for %s connection (fd %d); removing",
  609. conn_type_to_string(conn->type), conn->s);
  610. tor_fragile_assert();
  611. if (CONN_IS_EDGE(conn)) {
  612. /* otherwise we cry wolf about duplicate close */
  613. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  614. if (!edge_conn->end_reason)
  615. edge_conn->end_reason = END_STREAM_REASON_INTERNAL;
  616. edge_conn->edge_has_sent_end = 1;
  617. }
  618. connection_close_immediate(conn); /* So we don't try to flush. */
  619. connection_mark_for_close(conn);
  620. }
  621. }
  622. assert_connection_ok(conn, time(NULL));
  623. if (smartlist_len(closeable_connection_lst))
  624. close_closeable_connections();
  625. }
  626. /** If the connection at connection_array[i] is marked for close, then:
  627. * - If it has data that it wants to flush, try to flush it.
  628. * - If it _still_ has data to flush, and conn->hold_open_until_flushed is
  629. * true, then leave the connection open and return.
  630. * - Otherwise, remove the connection from connection_array and from
  631. * all other lists, close it, and free it.
  632. * Returns 1 if the connection was closed, 0 otherwise.
  633. */
  634. static int
  635. conn_close_if_marked(int i)
  636. {
  637. connection_t *conn;
  638. int retval;
  639. time_t now;
  640. conn = smartlist_get(connection_array, i);
  641. if (!conn->marked_for_close)
  642. return 0; /* nothing to see here, move along */
  643. now = time(NULL);
  644. assert_connection_ok(conn, now);
  645. /* assert_all_pending_dns_resolves_ok(); */
  646. #ifdef USE_BUFFEREVENTS
  647. if (conn->bufev) {
  648. if (conn->hold_open_until_flushed &&
  649. evbuffer_get_length(bufferevent_get_output(conn->bufev))) {
  650. /* don't close yet. */
  651. return 0;
  652. }
  653. if (conn->linked_conn && ! conn->linked_conn->marked_for_close) {
  654. /* We need to do this explicitly so that the linked connection
  655. * notices that there was an EOF. */
  656. bufferevent_flush(conn->bufev, EV_WRITE, BEV_FINISHED);
  657. }
  658. }
  659. #endif
  660. log_debug(LD_NET,"Cleaning up connection (fd %d).",conn->s);
  661. IF_HAS_BUFFEREVENT(conn, goto unlink);
  662. if ((conn->s >= 0 || conn->linked_conn) && connection_wants_to_flush(conn)) {
  663. /* s == -1 means it's an incomplete edge connection, or that the socket
  664. * has already been closed as unflushable. */
  665. ssize_t sz = connection_bucket_write_limit(conn, now);
  666. if (!conn->hold_open_until_flushed)
  667. log_info(LD_NET,
  668. "Conn (addr %s, fd %d, type %s, state %d) marked, but wants "
  669. "to flush %d bytes. (Marked at %s:%d)",
  670. escaped_safe_str_client(conn->address),
  671. conn->s, conn_type_to_string(conn->type), conn->state,
  672. (int)conn->outbuf_flushlen,
  673. conn->marked_for_close_file, conn->marked_for_close);
  674. if (conn->linked_conn) {
  675. retval = move_buf_to_buf(conn->linked_conn->inbuf, conn->outbuf,
  676. &conn->outbuf_flushlen);
  677. if (retval >= 0) {
  678. /* The linked conn will notice that it has data when it notices that
  679. * we're gone. */
  680. connection_start_reading_from_linked_conn(conn->linked_conn);
  681. }
  682. log_debug(LD_GENERAL, "Flushed last %d bytes from a linked conn; "
  683. "%d left; flushlen %d; wants-to-flush==%d", retval,
  684. (int)connection_get_outbuf_len(conn),
  685. (int)conn->outbuf_flushlen,
  686. connection_wants_to_flush(conn));
  687. } else if (connection_speaks_cells(conn)) {
  688. if (conn->state == OR_CONN_STATE_OPEN) {
  689. retval = flush_buf_tls(TO_OR_CONN(conn)->tls, conn->outbuf, sz,
  690. &conn->outbuf_flushlen);
  691. } else
  692. retval = -1; /* never flush non-open broken tls connections */
  693. } else {
  694. retval = flush_buf(conn->s, conn->outbuf, sz, &conn->outbuf_flushlen);
  695. }
  696. if (retval >= 0 && /* Technically, we could survive things like
  697. TLS_WANT_WRITE here. But don't bother for now. */
  698. conn->hold_open_until_flushed && connection_wants_to_flush(conn)) {
  699. if (retval > 0) {
  700. LOG_FN_CONN(conn, (LOG_INFO,LD_NET,
  701. "Holding conn (fd %d) open for more flushing.",
  702. conn->s));
  703. conn->timestamp_lastwritten = now; /* reset so we can flush more */
  704. }
  705. return 0;
  706. }
  707. if (connection_wants_to_flush(conn)) {
  708. int severity;
  709. if (conn->type == CONN_TYPE_EXIT ||
  710. (conn->type == CONN_TYPE_OR && server_mode(get_options())) ||
  711. (conn->type == CONN_TYPE_DIR && conn->purpose == DIR_PURPOSE_SERVER))
  712. severity = LOG_INFO;
  713. else
  714. severity = LOG_NOTICE;
  715. /* XXXX Maybe allow this to happen a certain amount per hour; it usually
  716. * is meaningless. */
  717. log_fn(severity, LD_NET, "We stalled too much while trying to write %d "
  718. "bytes to address %s. If this happens a lot, either "
  719. "something is wrong with your network connection, or "
  720. "something is wrong with theirs. "
  721. "(fd %d, type %s, state %d, marked at %s:%d).",
  722. (int)connection_get_outbuf_len(conn),
  723. escaped_safe_str_client(conn->address),
  724. conn->s, conn_type_to_string(conn->type), conn->state,
  725. conn->marked_for_close_file,
  726. conn->marked_for_close);
  727. }
  728. }
  729. #ifdef USE_BUFFEREVENTS
  730. unlink:
  731. #endif
  732. connection_unlink(conn); /* unlink, remove, free */
  733. return 1;
  734. }
  735. /** We've just tried every dirserver we know about, and none of
  736. * them were reachable. Assume the network is down. Change state
  737. * so next time an application connection arrives we'll delay it
  738. * and try another directory fetch. Kill off all the circuit_wait
  739. * streams that are waiting now, since they will all timeout anyway.
  740. */
  741. void
  742. directory_all_unreachable(time_t now)
  743. {
  744. connection_t *conn;
  745. (void)now;
  746. stats_n_seconds_working=0; /* reset it */
  747. while ((conn = connection_get_by_type_state(CONN_TYPE_AP,
  748. AP_CONN_STATE_CIRCUIT_WAIT))) {
  749. edge_connection_t *edge_conn = TO_EDGE_CONN(conn);
  750. log_notice(LD_NET,
  751. "Is your network connection down? "
  752. "Failing connection to '%s:%d'.",
  753. safe_str_client(edge_conn->socks_request->address),
  754. edge_conn->socks_request->port);
  755. connection_mark_unattached_ap(edge_conn,
  756. END_STREAM_REASON_NET_UNREACHABLE);
  757. }
  758. control_event_general_status(LOG_ERR, "DIR_ALL_UNREACHABLE");
  759. }
  760. /** This function is called whenever we successfully pull down some new
  761. * network statuses or server descriptors. */
  762. void
  763. directory_info_has_arrived(time_t now, int from_cache)
  764. {
  765. or_options_t *options = get_options();
  766. if (!router_have_minimum_dir_info()) {
  767. int quiet = directory_too_idle_to_fetch_descriptors(options, now);
  768. log(quiet ? LOG_INFO : LOG_NOTICE, LD_DIR,
  769. "I learned some more directory information, but not enough to "
  770. "build a circuit: %s", get_dir_info_status_string());
  771. update_router_descriptor_downloads(now);
  772. update_microdesc_downloads(now);
  773. return;
  774. } else {
  775. if (directory_fetches_from_authorities(options)) {
  776. update_router_descriptor_downloads(now);
  777. update_microdesc_downloads(now);
  778. }
  779. /* if we have enough dir info, then update our guard status with
  780. * whatever we just learned. */
  781. entry_guards_compute_status(options, now);
  782. /* Don't even bother trying to get extrainfo until the rest of our
  783. * directory info is up-to-date */
  784. if (options->DownloadExtraInfo)
  785. update_extrainfo_downloads(now);
  786. }
  787. if (server_mode(options) && !we_are_hibernating() && !from_cache &&
  788. (can_complete_circuit || !any_predicted_circuits(now)))
  789. consider_testing_reachability(1, 1);
  790. }
  791. /** How long do we wait before killing OR connections with no circuits?
  792. * In Tor versions up to 0.2.1.25 and 0.2.2.12-alpha, we waited 15 minutes
  793. * before cancelling these connections, which caused fast relays to accrue
  794. * many many idle connections. Hopefully 3 minutes is low enough that
  795. * it kills most idle connections, without being so low that we cause
  796. * clients to bounce on and off.
  797. */
  798. #define IDLE_OR_CONN_TIMEOUT 180
  799. /** Perform regular maintenance tasks for a single connection. This
  800. * function gets run once per second per connection by run_scheduled_events.
  801. */
  802. static void
  803. run_connection_housekeeping(int i, time_t now)
  804. {
  805. cell_t cell;
  806. connection_t *conn = smartlist_get(connection_array, i);
  807. or_options_t *options = get_options();
  808. or_connection_t *or_conn;
  809. int past_keepalive =
  810. now >= conn->timestamp_lastwritten + options->KeepalivePeriod;
  811. if (conn->outbuf && !connection_get_outbuf_len(conn) &&
  812. conn->type == CONN_TYPE_OR)
  813. TO_OR_CONN(conn)->timestamp_lastempty = now;
  814. if (conn->marked_for_close) {
  815. /* nothing to do here */
  816. return;
  817. }
  818. /* Expire any directory connections that haven't been active (sent
  819. * if a server or received if a client) for 5 min */
  820. if (conn->type == CONN_TYPE_DIR &&
  821. ((DIR_CONN_IS_SERVER(conn) &&
  822. conn->timestamp_lastwritten + DIR_CONN_MAX_STALL < now) ||
  823. (!DIR_CONN_IS_SERVER(conn) &&
  824. conn->timestamp_lastread + DIR_CONN_MAX_STALL < now))) {
  825. log_info(LD_DIR,"Expiring wedged directory conn (fd %d, purpose %d)",
  826. conn->s, conn->purpose);
  827. /* This check is temporary; it's to let us know whether we should consider
  828. * parsing partial serverdesc responses. */
  829. if (conn->purpose == DIR_PURPOSE_FETCH_SERVERDESC &&
  830. connection_get_inbuf_len(conn) >= 1024) {
  831. log_info(LD_DIR,"Trying to extract information from wedged server desc "
  832. "download.");
  833. connection_dir_reached_eof(TO_DIR_CONN(conn));
  834. } else {
  835. connection_mark_for_close(conn);
  836. }
  837. return;
  838. }
  839. if (!connection_speaks_cells(conn))
  840. return; /* we're all done here, the rest is just for OR conns */
  841. /* If we haven't written to an OR connection for a while, then either nuke
  842. the connection or send a keepalive, depending. */
  843. or_conn = TO_OR_CONN(conn);
  844. #ifdef USE_BUFFEREVENTS
  845. tor_assert(conn->bufev);
  846. #else
  847. tor_assert(conn->outbuf);
  848. #endif
  849. if (or_conn->is_bad_for_new_circs && !or_conn->n_circuits) {
  850. /* It's bad for new circuits, and has no unmarked circuits on it:
  851. * mark it now. */
  852. log_info(LD_OR,
  853. "Expiring non-used OR connection to fd %d (%s:%d) [Too old].",
  854. conn->s, conn->address, conn->port);
  855. if (conn->state == OR_CONN_STATE_CONNECTING)
  856. connection_or_connect_failed(TO_OR_CONN(conn),
  857. END_OR_CONN_REASON_TIMEOUT,
  858. "Tor gave up on the connection");
  859. connection_mark_and_flush(conn);
  860. } else if (!connection_state_is_open(conn)) {
  861. if (past_keepalive) {
  862. /* We never managed to actually get this connection open and happy. */
  863. log_info(LD_OR,"Expiring non-open OR connection to fd %d (%s:%d).",
  864. conn->s,conn->address, conn->port);
  865. connection_mark_for_close(conn);
  866. }
  867. } else if (we_are_hibernating() && !or_conn->n_circuits &&
  868. !connection_get_outbuf_len(conn)) {
  869. /* We're hibernating, there's no circuits, and nothing to flush.*/
  870. log_info(LD_OR,"Expiring non-used OR connection to fd %d (%s:%d) "
  871. "[Hibernating or exiting].",
  872. conn->s,conn->address, conn->port);
  873. connection_mark_and_flush(conn);
  874. } else if (!or_conn->n_circuits &&
  875. now >= or_conn->timestamp_last_added_nonpadding +
  876. IDLE_OR_CONN_TIMEOUT) {
  877. log_info(LD_OR,"Expiring non-used OR connection to fd %d (%s:%d) "
  878. "[idle %d].", conn->s,conn->address, conn->port,
  879. (int)(now - or_conn->timestamp_last_added_nonpadding));
  880. connection_mark_for_close(conn);
  881. } else if (
  882. now >= or_conn->timestamp_lastempty + options->KeepalivePeriod*10 &&
  883. now >= conn->timestamp_lastwritten + options->KeepalivePeriod*10) {
  884. log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,
  885. "Expiring stuck OR connection to fd %d (%s:%d). (%d bytes to "
  886. "flush; %d seconds since last write)",
  887. conn->s, conn->address, conn->port,
  888. (int)connection_get_outbuf_len(conn),
  889. (int)(now-conn->timestamp_lastwritten));
  890. connection_mark_for_close(conn);
  891. } else if (past_keepalive && !connection_get_outbuf_len(conn)) {
  892. /* send a padding cell */
  893. log_fn(LOG_DEBUG,LD_OR,"Sending keepalive to (%s:%d)",
  894. conn->address, conn->port);
  895. memset(&cell,0,sizeof(cell_t));
  896. cell.command = CELL_PADDING;
  897. connection_or_write_cell_to_buf(&cell, or_conn);
  898. }
  899. }
  900. /** Honor a NEWNYM request: make future requests unlinkable to past
  901. * requests. */
  902. static void
  903. signewnym_impl(time_t now)
  904. {
  905. circuit_expire_all_dirty_circs();
  906. addressmap_clear_transient();
  907. time_of_last_signewnym = now;
  908. signewnym_is_pending = 0;
  909. }
  910. /** Perform regular maintenance tasks. This function gets run once per
  911. * second by second_elapsed_callback().
  912. */
  913. static void
  914. run_scheduled_events(time_t now)
  915. {
  916. static time_t last_rotated_x509_certificate = 0;
  917. static time_t time_to_check_v3_certificate = 0;
  918. static time_t time_to_check_listeners = 0;
  919. static time_t time_to_check_descriptor = 0;
  920. static time_t time_to_check_ipaddress = 0;
  921. static time_t time_to_shrink_memory = 0;
  922. static time_t time_to_try_getting_descriptors = 0;
  923. static time_t time_to_reset_descriptor_failures = 0;
  924. static time_t time_to_add_entropy = 0;
  925. static time_t time_to_write_bridge_status_file = 0;
  926. static time_t time_to_downrate_stability = 0;
  927. static time_t time_to_save_stability = 0;
  928. static time_t time_to_clean_caches = 0;
  929. static time_t time_to_recheck_bandwidth = 0;
  930. static time_t time_to_check_for_expired_networkstatus = 0;
  931. static time_t time_to_write_stats_files = 0;
  932. static time_t time_to_write_bridge_stats = 0;
  933. static time_t time_to_check_port_forwarding = 0;
  934. static int should_init_bridge_stats = 1;
  935. static time_t time_to_retry_dns_init = 0;
  936. or_options_t *options = get_options();
  937. int i;
  938. int have_dir_info;
  939. /** 0. See if we've been asked to shut down and our timeout has
  940. * expired; or if our bandwidth limits are exhausted and we
  941. * should hibernate; or if it's time to wake up from hibernation.
  942. */
  943. consider_hibernation(now);
  944. #if 0
  945. {
  946. static time_t nl_check_time = 0;
  947. if (nl_check_time <= now) {
  948. nodelist_assert_ok();
  949. nl_check_time = now + 30;
  950. }
  951. }
  952. #endif
  953. /* 0b. If we've deferred a signewnym, make sure it gets handled
  954. * eventually. */
  955. if (signewnym_is_pending &&
  956. time_of_last_signewnym + MAX_SIGNEWNYM_RATE <= now) {
  957. log(LOG_INFO, LD_CONTROL, "Honoring delayed NEWNYM request");
  958. signewnym_impl(now);
  959. }
  960. /** 1a. Every MIN_ONION_KEY_LIFETIME seconds, rotate the onion keys,
  961. * shut down and restart all cpuworkers, and update the directory if
  962. * necessary.
  963. */
  964. if (server_mode(options) &&
  965. get_onion_key_set_at()+MIN_ONION_KEY_LIFETIME < now) {
  966. log_info(LD_GENERAL,"Rotating onion key.");
  967. rotate_onion_key();
  968. cpuworkers_rotate();
  969. if (router_rebuild_descriptor(1)<0) {
  970. log_info(LD_CONFIG, "Couldn't rebuild router descriptor");
  971. }
  972. if (advertised_server_mode())
  973. router_upload_dir_desc_to_dirservers(0);
  974. }
  975. if (time_to_try_getting_descriptors < now) {
  976. update_router_descriptor_downloads(now);
  977. update_extrainfo_downloads(now);
  978. update_microdesc_downloads(now);
  979. if (options->UseBridges)
  980. fetch_bridge_descriptors(options, now);
  981. if (router_have_minimum_dir_info())
  982. time_to_try_getting_descriptors = now + LAZY_DESCRIPTOR_RETRY_INTERVAL;
  983. else
  984. time_to_try_getting_descriptors = now + GREEDY_DESCRIPTOR_RETRY_INTERVAL;
  985. }
  986. if (time_to_reset_descriptor_failures < now) {
  987. router_reset_descriptor_download_failures();
  988. time_to_reset_descriptor_failures =
  989. now + DESCRIPTOR_FAILURE_RESET_INTERVAL;
  990. }
  991. /** 1b. Every MAX_SSL_KEY_LIFETIME seconds, we change our TLS context. */
  992. if (!last_rotated_x509_certificate)
  993. last_rotated_x509_certificate = now;
  994. if (last_rotated_x509_certificate+MAX_SSL_KEY_LIFETIME < now) {
  995. log_info(LD_GENERAL,"Rotating tls context.");
  996. if (tor_tls_context_new(get_identity_key(), MAX_SSL_KEY_LIFETIME) < 0) {
  997. log_warn(LD_BUG, "Error reinitializing TLS context");
  998. /* XXX is it a bug here, that we just keep going? -RD */
  999. }
  1000. last_rotated_x509_certificate = now;
  1001. /* We also make sure to rotate the TLS connections themselves if they've
  1002. * been up for too long -- but that's done via is_bad_for_new_circs in
  1003. * connection_run_housekeeping() above. */
  1004. }
  1005. if (time_to_add_entropy < now) {
  1006. if (time_to_add_entropy) {
  1007. /* We already seeded once, so don't die on failure. */
  1008. crypto_seed_rng(0);
  1009. }
  1010. /** How often do we add more entropy to OpenSSL's RNG pool? */
  1011. #define ENTROPY_INTERVAL (60*60)
  1012. time_to_add_entropy = now + ENTROPY_INTERVAL;
  1013. }
  1014. /** 1c. If we have to change the accounting interval or record
  1015. * bandwidth used in this accounting interval, do so. */
  1016. if (accounting_is_enabled(options))
  1017. accounting_run_housekeeping(now);
  1018. if (now % 10 == 0 && (authdir_mode_tests_reachability(options)) &&
  1019. !we_are_hibernating()) {
  1020. /* try to determine reachability of the other Tor relays */
  1021. dirserv_test_reachability(now);
  1022. }
  1023. /** 1d. Periodically, we discount older stability information so that new
  1024. * stability info counts more, and save the stability information to disk as
  1025. * appropriate. */
  1026. if (time_to_downrate_stability < now)
  1027. time_to_downrate_stability = rep_hist_downrate_old_runs(now);
  1028. if (authdir_mode_tests_reachability(options)) {
  1029. if (time_to_save_stability < now) {
  1030. if (time_to_save_stability && rep_hist_record_mtbf_data(now, 1)<0) {
  1031. log_warn(LD_GENERAL, "Couldn't store mtbf data.");
  1032. }
  1033. #define SAVE_STABILITY_INTERVAL (30*60)
  1034. time_to_save_stability = now + SAVE_STABILITY_INTERVAL;
  1035. }
  1036. }
  1037. /* 1e. Periodically, if we're a v3 authority, we check whether our cert is
  1038. * close to expiring and warn the admin if it is. */
  1039. if (time_to_check_v3_certificate < now) {
  1040. v3_authority_check_key_expiry();
  1041. #define CHECK_V3_CERTIFICATE_INTERVAL (5*60)
  1042. time_to_check_v3_certificate = now + CHECK_V3_CERTIFICATE_INTERVAL;
  1043. }
  1044. /* 1f. Check whether our networkstatus has expired.
  1045. */
  1046. if (time_to_check_for_expired_networkstatus < now) {
  1047. networkstatus_t *ns = networkstatus_get_latest_consensus();
  1048. /*XXXX RD: This value needs to be the same as REASONABLY_LIVE_TIME in
  1049. * networkstatus_get_reasonably_live_consensus(), but that value is way
  1050. * way too high. Arma: is the bridge issue there resolved yet? -NM */
  1051. #define NS_EXPIRY_SLOP (24*60*60)
  1052. if (ns && ns->valid_until < now+NS_EXPIRY_SLOP &&
  1053. router_have_minimum_dir_info()) {
  1054. router_dir_info_changed();
  1055. }
  1056. #define CHECK_EXPIRED_NS_INTERVAL (2*60)
  1057. time_to_check_for_expired_networkstatus = now + CHECK_EXPIRED_NS_INTERVAL;
  1058. }
  1059. /* 1g. Check whether we should write statistics to disk.
  1060. */
  1061. if (time_to_write_stats_files < now) {
  1062. #define CHECK_WRITE_STATS_INTERVAL (60*60)
  1063. time_t next_time_to_write_stats_files = (time_to_write_stats_files > 0 ?
  1064. time_to_write_stats_files : now) + CHECK_WRITE_STATS_INTERVAL;
  1065. if (options->CellStatistics) {
  1066. time_t next_write =
  1067. rep_hist_buffer_stats_write(time_to_write_stats_files);
  1068. if (next_write && next_write < next_time_to_write_stats_files)
  1069. next_time_to_write_stats_files = next_write;
  1070. }
  1071. if (options->DirReqStatistics) {
  1072. time_t next_write = geoip_dirreq_stats_write(time_to_write_stats_files);
  1073. if (next_write && next_write < next_time_to_write_stats_files)
  1074. next_time_to_write_stats_files = next_write;
  1075. }
  1076. if (options->EntryStatistics) {
  1077. time_t next_write = geoip_entry_stats_write(time_to_write_stats_files);
  1078. if (next_write && next_write < next_time_to_write_stats_files)
  1079. next_time_to_write_stats_files = next_write;
  1080. }
  1081. if (options->ExitPortStatistics) {
  1082. time_t next_write = rep_hist_exit_stats_write(time_to_write_stats_files);
  1083. if (next_write && next_write < next_time_to_write_stats_files)
  1084. next_time_to_write_stats_files = next_write;
  1085. }
  1086. time_to_write_stats_files = next_time_to_write_stats_files;
  1087. }
  1088. /* 1h. Check whether we should write bridge statistics to disk.
  1089. */
  1090. if (should_record_bridge_info(options)) {
  1091. if (time_to_write_bridge_stats < now) {
  1092. if (should_init_bridge_stats) {
  1093. /* (Re-)initialize bridge statistics. */
  1094. geoip_bridge_stats_init(now);
  1095. time_to_write_bridge_stats = now + WRITE_STATS_INTERVAL;
  1096. should_init_bridge_stats = 0;
  1097. } else {
  1098. /* Possibly write bridge statistics to disk and ask when to write
  1099. * them next time. */
  1100. time_to_write_bridge_stats = geoip_bridge_stats_write(
  1101. time_to_write_bridge_stats);
  1102. }
  1103. }
  1104. } else if (!should_init_bridge_stats) {
  1105. /* Bridge mode was turned off. Ensure that stats are re-initialized
  1106. * next time bridge mode is turned on. */
  1107. should_init_bridge_stats = 1;
  1108. }
  1109. /* Remove old information from rephist and the rend cache. */
  1110. if (time_to_clean_caches < now) {
  1111. rep_history_clean(now - options->RephistTrackTime);
  1112. rend_cache_clean();
  1113. rend_cache_clean_v2_descs_as_dir();
  1114. #define CLEAN_CACHES_INTERVAL (30*60)
  1115. time_to_clean_caches = now + CLEAN_CACHES_INTERVAL;
  1116. }
  1117. #define RETRY_DNS_INTERVAL (10*60)
  1118. /* If we're a server and initializing dns failed, retry periodically. */
  1119. if (time_to_retry_dns_init < now) {
  1120. time_to_retry_dns_init = now + RETRY_DNS_INTERVAL;
  1121. if (server_mode(options) && has_dns_init_failed())
  1122. dns_init();
  1123. }
  1124. /** 2. Periodically, we consider force-uploading our descriptor
  1125. * (if we've passed our internal checks). */
  1126. /** How often do we check whether part of our router info has changed in a way
  1127. * that would require an upload? */
  1128. #define CHECK_DESCRIPTOR_INTERVAL (60)
  1129. /** How often do we (as a router) check whether our IP address has changed? */
  1130. #define CHECK_IPADDRESS_INTERVAL (15*60)
  1131. /* 2b. Once per minute, regenerate and upload the descriptor if the old
  1132. * one is inaccurate. */
  1133. if (time_to_check_descriptor < now) {
  1134. static int dirport_reachability_count = 0;
  1135. time_to_check_descriptor = now + CHECK_DESCRIPTOR_INTERVAL;
  1136. check_descriptor_bandwidth_changed(now);
  1137. if (time_to_check_ipaddress < now) {
  1138. time_to_check_ipaddress = now + CHECK_IPADDRESS_INTERVAL;
  1139. check_descriptor_ipaddress_changed(now);
  1140. }
  1141. /** If our router descriptor ever goes this long without being regenerated
  1142. * because something changed, we force an immediate regenerate-and-upload. */
  1143. #define FORCE_REGENERATE_DESCRIPTOR_INTERVAL (18*60*60)
  1144. mark_my_descriptor_dirty_if_older_than(
  1145. now - FORCE_REGENERATE_DESCRIPTOR_INTERVAL);
  1146. consider_publishable_server(0);
  1147. /* also, check religiously for reachability, if it's within the first
  1148. * 20 minutes of our uptime. */
  1149. if (server_mode(options) &&
  1150. (can_complete_circuit || !any_predicted_circuits(now)) &&
  1151. !we_are_hibernating()) {
  1152. if (stats_n_seconds_working < TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT) {
  1153. consider_testing_reachability(1, dirport_reachability_count==0);
  1154. if (++dirport_reachability_count > 5)
  1155. dirport_reachability_count = 0;
  1156. } else if (time_to_recheck_bandwidth < now) {
  1157. /* If we haven't checked for 12 hours and our bandwidth estimate is
  1158. * low, do another bandwidth test. This is especially important for
  1159. * bridges, since they might go long periods without much use. */
  1160. const routerinfo_t *me = router_get_my_routerinfo();
  1161. if (time_to_recheck_bandwidth && me &&
  1162. me->bandwidthcapacity < me->bandwidthrate &&
  1163. me->bandwidthcapacity < 51200) {
  1164. reset_bandwidth_test();
  1165. }
  1166. #define BANDWIDTH_RECHECK_INTERVAL (12*60*60)
  1167. time_to_recheck_bandwidth = now + BANDWIDTH_RECHECK_INTERVAL;
  1168. }
  1169. }
  1170. /* If any networkstatus documents are no longer recent, we need to
  1171. * update all the descriptors' running status. */
  1172. /* purge obsolete entries */
  1173. networkstatus_v2_list_clean(now);
  1174. /* Remove dead routers. */
  1175. routerlist_remove_old_routers();
  1176. /* Also, once per minute, check whether we want to download any
  1177. * networkstatus documents.
  1178. */
  1179. update_networkstatus_downloads(now);
  1180. }
  1181. /** 2c. Let directory voting happen. */
  1182. if (authdir_mode_v3(options))
  1183. dirvote_act(options, now);
  1184. /** 3a. Every second, we examine pending circuits and prune the
  1185. * ones which have been pending for more than a few seconds.
  1186. * We do this before step 4, so it can try building more if
  1187. * it's not comfortable with the number of available circuits.
  1188. */
  1189. circuit_expire_building(now);
  1190. /** 3b. Also look at pending streams and prune the ones that 'began'
  1191. * a long time ago but haven't gotten a 'connected' yet.
  1192. * Do this before step 4, so we can put them back into pending
  1193. * state to be picked up by the new circuit.
  1194. */
  1195. connection_ap_expire_beginning();
  1196. /** 3c. And expire connections that we've held open for too long.
  1197. */
  1198. connection_expire_held_open();
  1199. /** 3d. And every 60 seconds, we relaunch listeners if any died. */
  1200. if (!we_are_hibernating() && time_to_check_listeners < now) {
  1201. retry_all_listeners(NULL, NULL);
  1202. time_to_check_listeners = now+60;
  1203. }
  1204. /** 4. Every second, we try a new circuit if there are no valid
  1205. * circuits. Every NewCircuitPeriod seconds, we expire circuits
  1206. * that became dirty more than MaxCircuitDirtiness seconds ago,
  1207. * and we make a new circ if there are no clean circuits.
  1208. */
  1209. have_dir_info = router_have_minimum_dir_info();
  1210. if (have_dir_info && !we_are_hibernating())
  1211. circuit_build_needed_circs(now);
  1212. /* every 10 seconds, but not at the same second as other such events */
  1213. if (now % 10 == 5)
  1214. circuit_expire_old_circuits_serverside(now);
  1215. /** 5. We do housekeeping for each connection... */
  1216. connection_or_set_bad_connections(NULL, 0);
  1217. for (i=0;i<smartlist_len(connection_array);i++) {
  1218. run_connection_housekeeping(i, now);
  1219. }
  1220. if (time_to_shrink_memory < now) {
  1221. SMARTLIST_FOREACH(connection_array, connection_t *, conn, {
  1222. if (conn->outbuf)
  1223. buf_shrink(conn->outbuf);
  1224. if (conn->inbuf)
  1225. buf_shrink(conn->inbuf);
  1226. });
  1227. clean_cell_pool();
  1228. buf_shrink_freelists(0);
  1229. /** How often do we check buffers and pools for empty space that can be
  1230. * deallocated? */
  1231. #define MEM_SHRINK_INTERVAL (60)
  1232. time_to_shrink_memory = now + MEM_SHRINK_INTERVAL;
  1233. }
  1234. /** 6. And remove any marked circuits... */
  1235. circuit_close_all_marked();
  1236. /** 7. And upload service descriptors if necessary. */
  1237. if (can_complete_circuit && !we_are_hibernating()) {
  1238. rend_consider_services_upload(now);
  1239. rend_consider_descriptor_republication();
  1240. }
  1241. /** 8. and blow away any connections that need to die. have to do this now,
  1242. * because if we marked a conn for close and left its socket -1, then
  1243. * we'll pass it to poll/select and bad things will happen.
  1244. */
  1245. close_closeable_connections();
  1246. /** 8b. And if anything in our state is ready to get flushed to disk, we
  1247. * flush it. */
  1248. or_state_save(now);
  1249. /** 9. and if we're a server, check whether our DNS is telling stories to
  1250. * us. */
  1251. if (server_mode(options) && time_to_check_for_correct_dns < now) {
  1252. if (!time_to_check_for_correct_dns) {
  1253. time_to_check_for_correct_dns = now + 60 + crypto_rand_int(120);
  1254. } else {
  1255. dns_launch_correctness_checks();
  1256. time_to_check_for_correct_dns = now + 12*3600 +
  1257. crypto_rand_int(12*3600);
  1258. }
  1259. }
  1260. /** 10b. write bridge networkstatus file to disk */
  1261. if (options->BridgeAuthoritativeDir &&
  1262. time_to_write_bridge_status_file < now) {
  1263. networkstatus_dump_bridge_status_to_file(now);
  1264. #define BRIDGE_STATUSFILE_INTERVAL (30*60)
  1265. time_to_write_bridge_status_file = now+BRIDGE_STATUSFILE_INTERVAL;
  1266. }
  1267. if (time_to_check_port_forwarding < now &&
  1268. options->PortForwarding &&
  1269. server_mode(options)) {
  1270. #define PORT_FORWARDING_CHECK_INTERVAL 5
  1271. tor_check_port_forwarding(options->PortForwardingHelper,
  1272. options->DirPort,
  1273. options->ORPort,
  1274. now);
  1275. time_to_check_port_forwarding = now+PORT_FORWARDING_CHECK_INTERVAL;
  1276. }
  1277. }
  1278. /** Timer: used to invoke second_elapsed_callback() once per second. */
  1279. static periodic_timer_t *second_timer = NULL;
  1280. /** Number of libevent errors in the last second: we die if we get too many. */
  1281. static int n_libevent_errors = 0;
  1282. /** Libevent callback: invoked once every second. */
  1283. static void
  1284. second_elapsed_callback(periodic_timer_t *timer, void *arg)
  1285. {
  1286. /* XXXX This could be sensibly refactored into multiple callbacks, and we
  1287. * could use Libevent's timers for this rather than checking the current
  1288. * time against a bunch of timeouts every second. */
  1289. static time_t current_second = 0;
  1290. time_t now;
  1291. size_t bytes_written;
  1292. size_t bytes_read;
  1293. int seconds_elapsed;
  1294. #ifdef USE_BUFFEREVENTS
  1295. uint64_t cur_read,cur_written;
  1296. #endif
  1297. or_options_t *options = get_options();
  1298. (void)timer;
  1299. (void)arg;
  1300. n_libevent_errors = 0;
  1301. /* log_notice(LD_GENERAL, "Tick."); */
  1302. now = time(NULL);
  1303. update_approx_time(now);
  1304. /* the second has rolled over. check more stuff. */
  1305. seconds_elapsed = current_second ? (int)(now - current_second) : 0;
  1306. #ifdef USE_BUFFEREVENTS
  1307. connection_get_rate_limit_totals(&cur_read, &cur_written);
  1308. bytes_written = (size_t)(cur_written - stats_prev_n_written);
  1309. bytes_read = (size_t)(cur_read - stats_prev_n_read);
  1310. #else
  1311. bytes_written = stats_prev_global_write_bucket - global_write_bucket;
  1312. bytes_read = stats_prev_global_read_bucket - global_read_bucket;
  1313. #endif
  1314. stats_n_bytes_read += bytes_read;
  1315. stats_n_bytes_written += bytes_written;
  1316. if (accounting_is_enabled(options) && seconds_elapsed >= 0)
  1317. accounting_add_bytes(bytes_read, bytes_written, seconds_elapsed);
  1318. control_event_bandwidth_used((uint32_t)bytes_read,(uint32_t)bytes_written);
  1319. control_event_stream_bandwidth_used();
  1320. if (seconds_elapsed > 0)
  1321. connection_bucket_refill(seconds_elapsed, now);
  1322. #ifdef USE_BUFFEREVENTS
  1323. stats_prev_n_written = cur_written;
  1324. stats_prev_n_read = cur_read;
  1325. #else
  1326. stats_prev_global_read_bucket = global_read_bucket;
  1327. stats_prev_global_write_bucket = global_write_bucket;
  1328. #endif
  1329. if (server_mode(options) &&
  1330. !we_are_hibernating() &&
  1331. seconds_elapsed > 0 &&
  1332. can_complete_circuit &&
  1333. stats_n_seconds_working / TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT !=
  1334. (stats_n_seconds_working+seconds_elapsed) /
  1335. TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT) {
  1336. /* every 20 minutes, check and complain if necessary */
  1337. const routerinfo_t *me = router_get_my_routerinfo();
  1338. if (me && !check_whether_orport_reachable()) {
  1339. log_warn(LD_CONFIG,"Your server (%s:%d) has not managed to confirm that "
  1340. "its ORPort is reachable. Please check your firewalls, ports, "
  1341. "address, /etc/hosts file, etc.",
  1342. me->address, me->or_port);
  1343. control_event_server_status(LOG_WARN,
  1344. "REACHABILITY_FAILED ORADDRESS=%s:%d",
  1345. me->address, me->or_port);
  1346. }
  1347. if (me && !check_whether_dirport_reachable()) {
  1348. log_warn(LD_CONFIG,
  1349. "Your server (%s:%d) has not managed to confirm that its "
  1350. "DirPort is reachable. Please check your firewalls, ports, "
  1351. "address, /etc/hosts file, etc.",
  1352. me->address, me->dir_port);
  1353. control_event_server_status(LOG_WARN,
  1354. "REACHABILITY_FAILED DIRADDRESS=%s:%d",
  1355. me->address, me->dir_port);
  1356. }
  1357. }
  1358. /** If more than this many seconds have elapsed, probably the clock
  1359. * jumped: doesn't count. */
  1360. #define NUM_JUMPED_SECONDS_BEFORE_WARN 100
  1361. if (seconds_elapsed < -NUM_JUMPED_SECONDS_BEFORE_WARN ||
  1362. seconds_elapsed >= NUM_JUMPED_SECONDS_BEFORE_WARN) {
  1363. circuit_note_clock_jumped(seconds_elapsed);
  1364. /* XXX if the time jumps *back* many months, do our events in
  1365. * run_scheduled_events() recover? I don't think they do. -RD */
  1366. } else if (seconds_elapsed > 0)
  1367. stats_n_seconds_working += seconds_elapsed;
  1368. run_scheduled_events(now);
  1369. current_second = now; /* remember which second it is, for next time */
  1370. }
  1371. #ifndef MS_WINDOWS
  1372. /** Called when a possibly ignorable libevent error occurs; ensures that we
  1373. * don't get into an infinite loop by ignoring too many errors from
  1374. * libevent. */
  1375. static int
  1376. got_libevent_error(void)
  1377. {
  1378. if (++n_libevent_errors > 8) {
  1379. log_err(LD_NET, "Too many libevent errors in one second; dying");
  1380. return -1;
  1381. }
  1382. return 0;
  1383. }
  1384. #endif
  1385. #define UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST (6*60*60)
  1386. /** Called when our IP address seems to have changed. <b>at_interface</b>
  1387. * should be true if we detected a change in our interface, and false if we
  1388. * detected a change in our published address. */
  1389. void
  1390. ip_address_changed(int at_interface)
  1391. {
  1392. int server = server_mode(get_options());
  1393. if (at_interface) {
  1394. if (! server) {
  1395. /* Okay, change our keys. */
  1396. init_keys();
  1397. }
  1398. } else {
  1399. if (server) {
  1400. if (stats_n_seconds_working > UPTIME_CUTOFF_FOR_NEW_BANDWIDTH_TEST)
  1401. reset_bandwidth_test();
  1402. stats_n_seconds_working = 0;
  1403. router_reset_reachability();
  1404. mark_my_descriptor_dirty();
  1405. }
  1406. }
  1407. dns_servers_relaunch_checks();
  1408. }
  1409. /** Forget what we've learned about the correctness of our DNS servers, and
  1410. * start learning again. */
  1411. void
  1412. dns_servers_relaunch_checks(void)
  1413. {
  1414. if (server_mode(get_options())) {
  1415. dns_reset_correctness_checks();
  1416. time_to_check_for_correct_dns = 0;
  1417. }
  1418. }
  1419. /** Called when we get a SIGHUP: reload configuration files and keys,
  1420. * retry all connections, and so on. */
  1421. static int
  1422. do_hup(void)
  1423. {
  1424. or_options_t *options = get_options();
  1425. #ifdef USE_DMALLOC
  1426. dmalloc_log_stats();
  1427. dmalloc_log_changed(0, 1, 0, 0);
  1428. #endif
  1429. log_notice(LD_GENERAL,"Received reload signal (hup). Reloading config and "
  1430. "resetting internal state.");
  1431. if (accounting_is_enabled(options))
  1432. accounting_record_bandwidth_usage(time(NULL), get_or_state());
  1433. router_reset_warnings();
  1434. routerlist_reset_warnings();
  1435. addressmap_clear_transient();
  1436. /* first, reload config variables, in case they've changed */
  1437. if (options->ReloadTorrcOnSIGHUP) {
  1438. /* no need to provide argc/v, they've been cached in init_from_config */
  1439. if (options_init_from_torrc(0, NULL) < 0) {
  1440. log_err(LD_CONFIG,"Reading config failed--see warnings above. "
  1441. "For usage, try -h.");
  1442. return -1;
  1443. }
  1444. options = get_options(); /* they have changed now */
  1445. } else {
  1446. log_notice(LD_GENERAL, "Not reloading config file: the controller told "
  1447. "us not to.");
  1448. }
  1449. if (authdir_mode_handles_descs(options, -1)) {
  1450. /* reload the approved-routers file */
  1451. if (dirserv_load_fingerprint_file() < 0) {
  1452. /* warnings are logged from dirserv_load_fingerprint_file() directly */
  1453. log_info(LD_GENERAL, "Error reloading fingerprints. "
  1454. "Continuing with old list.");
  1455. }
  1456. }
  1457. /* Rotate away from the old dirty circuits. This has to be done
  1458. * after we've read the new options, but before we start using
  1459. * circuits for directory fetches. */
  1460. circuit_expire_all_dirty_circs();
  1461. /* retry appropriate downloads */
  1462. router_reset_status_download_failures();
  1463. router_reset_descriptor_download_failures();
  1464. update_networkstatus_downloads(time(NULL));
  1465. /* We'll retry routerstatus downloads in about 10 seconds; no need to
  1466. * force a retry there. */
  1467. if (server_mode(options)) {
  1468. /* Restart cpuworker and dnsworker processes, so they get up-to-date
  1469. * configuration options. */
  1470. cpuworkers_rotate();
  1471. dns_reset();
  1472. }
  1473. return 0;
  1474. }
  1475. /** Tor main loop. */
  1476. /* static */ int
  1477. do_main_loop(void)
  1478. {
  1479. int loop_result;
  1480. time_t now;
  1481. /* initialize dns resolve map, spawn workers if needed */
  1482. if (dns_init() < 0) {
  1483. if (get_options()->ServerDNSAllowBrokenConfig)
  1484. log_warn(LD_GENERAL, "Couldn't set up any working nameservers. "
  1485. "Network not up yet? Will try again soon.");
  1486. else {
  1487. log_err(LD_GENERAL,"Error initializing dns subsystem; exiting. To "
  1488. "retry instead, set the ServerDNSAllowBrokenResolvConf option.");
  1489. }
  1490. }
  1491. handle_signals(1);
  1492. /* load the private keys, if we're supposed to have them, and set up the
  1493. * TLS context. */
  1494. if (! identity_key_is_set()) {
  1495. if (init_keys() < 0) {
  1496. log_err(LD_BUG,"Error initializing keys; exiting");
  1497. return -1;
  1498. }
  1499. }
  1500. /* Set up the packed_cell_t memory pool. */
  1501. init_cell_pool();
  1502. /* Set up our buckets */
  1503. connection_bucket_init();
  1504. #ifndef USE_BUFFEREVENTS
  1505. stats_prev_global_read_bucket = global_read_bucket;
  1506. stats_prev_global_write_bucket = global_write_bucket;
  1507. #endif
  1508. /* initialize the bootstrap status events to know we're starting up */
  1509. control_event_bootstrap(BOOTSTRAP_STATUS_STARTING, 0);
  1510. if (trusted_dirs_reload_certs()) {
  1511. log_warn(LD_DIR,
  1512. "Couldn't load all cached v3 certificates. Starting anyway.");
  1513. }
  1514. if (router_reload_v2_networkstatus()) {
  1515. return -1;
  1516. }
  1517. if (router_reload_consensus_networkstatus()) {
  1518. return -1;
  1519. }
  1520. /* load the routers file, or assign the defaults. */
  1521. if (router_reload_router_list()) {
  1522. return -1;
  1523. }
  1524. /* load the networkstatuses. (This launches a download for new routers as
  1525. * appropriate.)
  1526. */
  1527. now = time(NULL);
  1528. directory_info_has_arrived(now, 1);
  1529. if (server_mode(get_options())) {
  1530. /* launch cpuworkers. Need to do this *after* we've read the onion key. */
  1531. cpu_init();
  1532. }
  1533. /* set up once-a-second callback. */
  1534. if (! second_timer) {
  1535. struct timeval one_second;
  1536. one_second.tv_sec = 1;
  1537. one_second.tv_usec = 0;
  1538. second_timer = periodic_timer_new(tor_libevent_get_base(),
  1539. &one_second,
  1540. second_elapsed_callback,
  1541. NULL);
  1542. tor_assert(second_timer);
  1543. }
  1544. for (;;) {
  1545. if (nt_service_is_stopping())
  1546. return 0;
  1547. #ifndef MS_WINDOWS
  1548. /* Make it easier to tell whether libevent failure is our fault or not. */
  1549. errno = 0;
  1550. #endif
  1551. /* All active linked conns should get their read events activated. */
  1552. SMARTLIST_FOREACH(active_linked_connection_lst, connection_t *, conn,
  1553. event_active(conn->read_event, EV_READ, 1));
  1554. called_loop_once = smartlist_len(active_linked_connection_lst) ? 1 : 0;
  1555. update_approx_time(time(NULL));
  1556. /* poll until we have an event, or the second ends, or until we have
  1557. * some active linked connections to trigger events for. */
  1558. loop_result = event_base_loop(tor_libevent_get_base(),
  1559. called_loop_once ? EVLOOP_ONCE : 0);
  1560. /* let catch() handle things like ^c, and otherwise don't worry about it */
  1561. if (loop_result < 0) {
  1562. int e = tor_socket_errno(-1);
  1563. /* let the program survive things like ^z */
  1564. if (e != EINTR && !ERRNO_IS_EINPROGRESS(e)) {
  1565. log_err(LD_NET,"libevent call with %s failed: %s [%d]",
  1566. tor_libevent_get_method(), tor_socket_strerror(e), e);
  1567. return -1;
  1568. #ifndef MS_WINDOWS
  1569. } else if (e == EINVAL) {
  1570. log_warn(LD_NET, "EINVAL from libevent: should you upgrade libevent?");
  1571. if (got_libevent_error())
  1572. return -1;
  1573. #endif
  1574. } else {
  1575. if (ERRNO_IS_EINPROGRESS(e))
  1576. log_warn(LD_BUG,
  1577. "libevent call returned EINPROGRESS? Please report.");
  1578. log_debug(LD_NET,"libevent call interrupted.");
  1579. /* You can't trust the results of this poll(). Go back to the
  1580. * top of the big for loop. */
  1581. continue;
  1582. }
  1583. }
  1584. }
  1585. }
  1586. /** Used to implement the SIGNAL control command: if we accept
  1587. * <b>the_signal</b> as a remote pseudo-signal, act on it. */
  1588. /* We don't re-use catch() here because:
  1589. * 1. We handle a different set of signals than those allowed in catch.
  1590. * 2. Platforms without signal() are unlikely to define SIGfoo.
  1591. * 3. The control spec is defined to use fixed numeric signal values
  1592. * which just happen to match the Unix values.
  1593. */
  1594. void
  1595. control_signal_act(int the_signal)
  1596. {
  1597. switch (the_signal)
  1598. {
  1599. case 1:
  1600. signal_callback(0,0,(void*)(uintptr_t)SIGHUP);
  1601. break;
  1602. case 2:
  1603. signal_callback(0,0,(void*)(uintptr_t)SIGINT);
  1604. break;
  1605. case 10:
  1606. signal_callback(0,0,(void*)(uintptr_t)SIGUSR1);
  1607. break;
  1608. case 12:
  1609. signal_callback(0,0,(void*)(uintptr_t)SIGUSR2);
  1610. break;
  1611. case 15:
  1612. signal_callback(0,0,(void*)(uintptr_t)SIGTERM);
  1613. break;
  1614. case SIGNEWNYM:
  1615. signal_callback(0,0,(void*)(uintptr_t)SIGNEWNYM);
  1616. break;
  1617. case SIGCLEARDNSCACHE:
  1618. signal_callback(0,0,(void*)(uintptr_t)SIGCLEARDNSCACHE);
  1619. break;
  1620. default:
  1621. log_warn(LD_BUG, "Unrecognized signal number %d.", the_signal);
  1622. break;
  1623. }
  1624. }
  1625. /** Libevent callback: invoked when we get a signal.
  1626. */
  1627. static void
  1628. signal_callback(int fd, short events, void *arg)
  1629. {
  1630. uintptr_t sig = (uintptr_t)arg;
  1631. (void)fd;
  1632. (void)events;
  1633. switch (sig)
  1634. {
  1635. case SIGTERM:
  1636. log_notice(LD_GENERAL,"Catching signal TERM, exiting cleanly.");
  1637. tor_cleanup();
  1638. exit(0);
  1639. break;
  1640. case SIGINT:
  1641. if (!server_mode(get_options())) { /* do it now */
  1642. log_notice(LD_GENERAL,"Interrupt: exiting cleanly.");
  1643. tor_cleanup();
  1644. exit(0);
  1645. }
  1646. hibernate_begin_shutdown();
  1647. break;
  1648. #ifdef SIGPIPE
  1649. case SIGPIPE:
  1650. log_debug(LD_GENERAL,"Caught SIGPIPE. Ignoring.");
  1651. break;
  1652. #endif
  1653. case SIGUSR1:
  1654. /* prefer to log it at INFO, but make sure we always see it */
  1655. dumpstats(get_min_log_level()<LOG_INFO ? get_min_log_level() : LOG_INFO);
  1656. break;
  1657. case SIGUSR2:
  1658. switch_logs_debug();
  1659. log_debug(LD_GENERAL,"Caught USR2, going to loglevel debug. "
  1660. "Send HUP to change back.");
  1661. break;
  1662. case SIGHUP:
  1663. if (do_hup() < 0) {
  1664. log_warn(LD_CONFIG,"Restart failed (config error?). Exiting.");
  1665. tor_cleanup();
  1666. exit(1);
  1667. }
  1668. break;
  1669. #ifdef SIGCHLD
  1670. case SIGCHLD:
  1671. while (waitpid(-1,NULL,WNOHANG) > 0) ; /* keep reaping until no more
  1672. zombies */
  1673. break;
  1674. #endif
  1675. case SIGNEWNYM: {
  1676. time_t now = time(NULL);
  1677. if (time_of_last_signewnym + MAX_SIGNEWNYM_RATE > now) {
  1678. signewnym_is_pending = 1;
  1679. log(LOG_NOTICE, LD_CONTROL,
  1680. "Rate limiting NEWNYM request: delaying by %d second(s)",
  1681. (int)(MAX_SIGNEWNYM_RATE+time_of_last_signewnym-now));
  1682. } else {
  1683. signewnym_impl(now);
  1684. }
  1685. break;
  1686. }
  1687. case SIGCLEARDNSCACHE:
  1688. addressmap_clear_transient();
  1689. break;
  1690. }
  1691. }
  1692. extern uint64_t rephist_total_alloc;
  1693. extern uint32_t rephist_total_num;
  1694. /**
  1695. * Write current memory usage information to the log.
  1696. */
  1697. static void
  1698. dumpmemusage(int severity)
  1699. {
  1700. connection_dump_buffer_mem_stats(severity);
  1701. log(severity, LD_GENERAL, "In rephist: "U64_FORMAT" used by %d Tors.",
  1702. U64_PRINTF_ARG(rephist_total_alloc), rephist_total_num);
  1703. dump_routerlist_mem_usage(severity);
  1704. dump_cell_pool_usage(severity);
  1705. dump_dns_mem_usage(severity);
  1706. buf_dump_freelist_sizes(severity);
  1707. tor_log_mallinfo(severity);
  1708. }
  1709. /** Write all statistics to the log, with log level <b>severity</b>. Called
  1710. * in response to a SIGUSR1. */
  1711. static void
  1712. dumpstats(int severity)
  1713. {
  1714. time_t now = time(NULL);
  1715. time_t elapsed;
  1716. size_t rbuf_cap, wbuf_cap, rbuf_len, wbuf_len;
  1717. log(severity, LD_GENERAL, "Dumping stats:");
  1718. SMARTLIST_FOREACH(connection_array, connection_t *, conn,
  1719. {
  1720. int i = conn_sl_idx;
  1721. log(severity, LD_GENERAL,
  1722. "Conn %d (socket %d) type %d (%s), state %d (%s), created %d secs ago",
  1723. i, conn->s, conn->type, conn_type_to_string(conn->type),
  1724. conn->state, conn_state_to_string(conn->type, conn->state),
  1725. (int)(now - conn->timestamp_created));
  1726. if (!connection_is_listener(conn)) {
  1727. log(severity,LD_GENERAL,
  1728. "Conn %d is to %s:%d.", i,
  1729. safe_str_client(conn->address),
  1730. conn->port);
  1731. log(severity,LD_GENERAL,
  1732. "Conn %d: %d bytes waiting on inbuf (len %d, last read %d secs ago)",
  1733. i,
  1734. (int)connection_get_inbuf_len(conn),
  1735. (int)buf_allocation(conn->inbuf),
  1736. (int)(now - conn->timestamp_lastread));
  1737. log(severity,LD_GENERAL,
  1738. "Conn %d: %d bytes waiting on outbuf "
  1739. "(len %d, last written %d secs ago)",i,
  1740. (int)connection_get_outbuf_len(conn),
  1741. (int)buf_allocation(conn->outbuf),
  1742. (int)(now - conn->timestamp_lastwritten));
  1743. if (conn->type == CONN_TYPE_OR) {
  1744. or_connection_t *or_conn = TO_OR_CONN(conn);
  1745. if (or_conn->tls) {
  1746. tor_tls_get_buffer_sizes(or_conn->tls, &rbuf_cap, &rbuf_len,
  1747. &wbuf_cap, &wbuf_len);
  1748. log(severity, LD_GENERAL,
  1749. "Conn %d: %d/%d bytes used on OpenSSL read buffer; "
  1750. "%d/%d bytes used on write buffer.",
  1751. i, (int)rbuf_len, (int)rbuf_cap, (int)wbuf_len, (int)wbuf_cap);
  1752. }
  1753. }
  1754. }
  1755. circuit_dump_by_conn(conn, severity); /* dump info about all the circuits
  1756. * using this conn */
  1757. });
  1758. log(severity, LD_NET,
  1759. "Cells processed: "U64_FORMAT" padding\n"
  1760. " "U64_FORMAT" create\n"
  1761. " "U64_FORMAT" created\n"
  1762. " "U64_FORMAT" relay\n"
  1763. " ("U64_FORMAT" relayed)\n"
  1764. " ("U64_FORMAT" delivered)\n"
  1765. " "U64_FORMAT" destroy",
  1766. U64_PRINTF_ARG(stats_n_padding_cells_processed),
  1767. U64_PRINTF_ARG(stats_n_create_cells_processed),
  1768. U64_PRINTF_ARG(stats_n_created_cells_processed),
  1769. U64_PRINTF_ARG(stats_n_relay_cells_processed),
  1770. U64_PRINTF_ARG(stats_n_relay_cells_relayed),
  1771. U64_PRINTF_ARG(stats_n_relay_cells_delivered),
  1772. U64_PRINTF_ARG(stats_n_destroy_cells_processed));
  1773. if (stats_n_data_cells_packaged)
  1774. log(severity,LD_NET,"Average packaged cell fullness: %2.3f%%",
  1775. 100*(U64_TO_DBL(stats_n_data_bytes_packaged) /
  1776. U64_TO_DBL(stats_n_data_cells_packaged*RELAY_PAYLOAD_SIZE)) );
  1777. if (stats_n_data_cells_received)
  1778. log(severity,LD_NET,"Average delivered cell fullness: %2.3f%%",
  1779. 100*(U64_TO_DBL(stats_n_data_bytes_received) /
  1780. U64_TO_DBL(stats_n_data_cells_received*RELAY_PAYLOAD_SIZE)) );
  1781. if (now - time_of_process_start >= 0)
  1782. elapsed = now - time_of_process_start;
  1783. else
  1784. elapsed = 0;
  1785. if (elapsed) {
  1786. log(severity, LD_NET,
  1787. "Average bandwidth: "U64_FORMAT"/%d = %d bytes/sec reading",
  1788. U64_PRINTF_ARG(stats_n_bytes_read),
  1789. (int)elapsed,
  1790. (int) (stats_n_bytes_read/elapsed));
  1791. log(severity, LD_NET,
  1792. "Average bandwidth: "U64_FORMAT"/%d = %d bytes/sec writing",
  1793. U64_PRINTF_ARG(stats_n_bytes_written),
  1794. (int)elapsed,
  1795. (int) (stats_n_bytes_written/elapsed));
  1796. }
  1797. log(severity, LD_NET, "--------------- Dumping memory information:");
  1798. dumpmemusage(severity);
  1799. rep_hist_dump_stats(now,severity);
  1800. rend_service_dump_stats(severity);
  1801. dump_pk_ops(severity);
  1802. dump_distinct_digest_count(severity);
  1803. }
  1804. /** Called by exit() as we shut down the process.
  1805. */
  1806. static void
  1807. exit_function(void)
  1808. {
  1809. /* NOTE: If we ever daemonize, this gets called immediately. That's
  1810. * okay for now, because we only use this on Windows. */
  1811. #ifdef MS_WINDOWS
  1812. WSACleanup();
  1813. #endif
  1814. }
  1815. /** Set up the signal handlers for either parent or child. */
  1816. void
  1817. handle_signals(int is_parent)
  1818. {
  1819. #ifndef MS_WINDOWS /* do signal stuff only on Unix */
  1820. int i;
  1821. static const int signals[] = {
  1822. SIGINT, /* do a controlled slow shutdown */
  1823. SIGTERM, /* to terminate now */
  1824. SIGPIPE, /* otherwise SIGPIPE kills us */
  1825. SIGUSR1, /* dump stats */
  1826. SIGUSR2, /* go to loglevel debug */
  1827. SIGHUP, /* to reload config, retry conns, etc */
  1828. #ifdef SIGXFSZ
  1829. SIGXFSZ, /* handle file-too-big resource exhaustion */
  1830. #endif
  1831. SIGCHLD, /* handle dns/cpu workers that exit */
  1832. -1 };
  1833. static struct event *signal_events[16]; /* bigger than it has to be. */
  1834. if (is_parent) {
  1835. for (i = 0; signals[i] >= 0; ++i) {
  1836. signal_events[i] = tor_evsignal_new(
  1837. tor_libevent_get_base(), signals[i], signal_callback,
  1838. (void*)(uintptr_t)signals[i]);
  1839. if (event_add(signal_events[i], NULL))
  1840. log_warn(LD_BUG, "Error from libevent when adding event for signal %d",
  1841. signals[i]);
  1842. }
  1843. } else {
  1844. struct sigaction action;
  1845. action.sa_flags = 0;
  1846. sigemptyset(&action.sa_mask);
  1847. action.sa_handler = SIG_IGN;
  1848. sigaction(SIGINT, &action, NULL);
  1849. sigaction(SIGTERM, &action, NULL);
  1850. sigaction(SIGPIPE, &action, NULL);
  1851. sigaction(SIGUSR1, &action, NULL);
  1852. sigaction(SIGUSR2, &action, NULL);
  1853. sigaction(SIGHUP, &action, NULL);
  1854. #ifdef SIGXFSZ
  1855. sigaction(SIGXFSZ, &action, NULL);
  1856. #endif
  1857. }
  1858. #else /* MS windows */
  1859. (void)is_parent;
  1860. #endif /* signal stuff */
  1861. }
  1862. /** Main entry point for the Tor command-line client.
  1863. */
  1864. /* static */ int
  1865. tor_init(int argc, char *argv[])
  1866. {
  1867. char buf[256];
  1868. int i, quiet = 0;
  1869. time_of_process_start = time(NULL);
  1870. if (!connection_array)
  1871. connection_array = smartlist_create();
  1872. if (!closeable_connection_lst)
  1873. closeable_connection_lst = smartlist_create();
  1874. if (!active_linked_connection_lst)
  1875. active_linked_connection_lst = smartlist_create();
  1876. /* Have the log set up with our application name. */
  1877. tor_snprintf(buf, sizeof(buf), "Tor %s", get_version());
  1878. log_set_application_name(buf);
  1879. /* Initialize the history structures. */
  1880. rep_hist_init();
  1881. /* Initialize the service cache. */
  1882. rend_cache_init();
  1883. addressmap_init(); /* Init the client dns cache. Do it always, since it's
  1884. * cheap. */
  1885. /* We search for the "quiet" option first, since it decides whether we
  1886. * will log anything at all to the command line. */
  1887. for (i=1;i<argc;++i) {
  1888. if (!strcmp(argv[i], "--hush"))
  1889. quiet = 1;
  1890. if (!strcmp(argv[i], "--quiet"))
  1891. quiet = 2;
  1892. }
  1893. /* give it somewhere to log to initially */
  1894. switch (quiet) {
  1895. case 2:
  1896. /* no initial logging */
  1897. break;
  1898. case 1:
  1899. add_temp_log(LOG_WARN);
  1900. break;
  1901. default:
  1902. add_temp_log(LOG_NOTICE);
  1903. }
  1904. log(LOG_NOTICE, LD_GENERAL, "Tor v%s. This is experimental software. "
  1905. "Do not rely on it for strong anonymity. (Running on %s)",get_version(),
  1906. get_uname());
  1907. if (network_init()<0) {
  1908. log_err(LD_BUG,"Error initializing network; exiting.");
  1909. return -1;
  1910. }
  1911. atexit(exit_function);
  1912. if (options_init_from_torrc(argc,argv) < 0) {
  1913. log_err(LD_CONFIG,"Reading config failed--see warnings above.");
  1914. return -1;
  1915. }
  1916. #ifndef MS_WINDOWS
  1917. if (geteuid()==0)
  1918. log_warn(LD_GENERAL,"You are running Tor as root. You don't need to, "
  1919. "and you probably shouldn't.");
  1920. #endif
  1921. if (crypto_global_init(get_options()->HardwareAccel,
  1922. get_options()->AccelName,
  1923. get_options()->AccelDir)) {
  1924. log_err(LD_BUG, "Unable to initialize OpenSSL. Exiting.");
  1925. return -1;
  1926. }
  1927. return 0;
  1928. }
  1929. /** A lockfile structure, used to prevent two Tors from messing with the
  1930. * data directory at once. If this variable is non-NULL, we're holding
  1931. * the lockfile. */
  1932. static tor_lockfile_t *lockfile = NULL;
  1933. /** Try to grab the lock file described in <b>options</b>, if we do not
  1934. * already have it. If <b>err_if_locked</b> is true, warn if somebody else is
  1935. * holding the lock, and exit if we can't get it after waiting. Otherwise,
  1936. * return -1 if we can't get the lockfile. Return 0 on success.
  1937. */
  1938. int
  1939. try_locking(or_options_t *options, int err_if_locked)
  1940. {
  1941. if (lockfile)
  1942. return 0;
  1943. else {
  1944. char *fname = options_get_datadir_fname2_suffix(options, "lock",NULL,NULL);
  1945. int already_locked = 0;
  1946. tor_lockfile_t *lf = tor_lockfile_lock(fname, 0, &already_locked);
  1947. tor_free(fname);
  1948. if (!lf) {
  1949. if (err_if_locked && already_locked) {
  1950. int r;
  1951. log_warn(LD_GENERAL, "It looks like another Tor process is running "
  1952. "with the same data directory. Waiting 5 seconds to see "
  1953. "if it goes away.");
  1954. #ifndef WIN32
  1955. sleep(5);
  1956. #else
  1957. Sleep(5000);
  1958. #endif
  1959. r = try_locking(options, 0);
  1960. if (r<0) {
  1961. log_err(LD_GENERAL, "No, it's still there. Exiting.");
  1962. exit(0);
  1963. }
  1964. return r;
  1965. }
  1966. return -1;
  1967. }
  1968. lockfile = lf;
  1969. return 0;
  1970. }
  1971. }
  1972. /** Return true iff we've successfully acquired the lock file. */
  1973. int
  1974. have_lockfile(void)
  1975. {
  1976. return lockfile != NULL;
  1977. }
  1978. /** If we have successfully acquired the lock file, release it. */
  1979. void
  1980. release_lockfile(void)
  1981. {
  1982. if (lockfile) {
  1983. tor_lockfile_unlock(lockfile);
  1984. lockfile = NULL;
  1985. }
  1986. }
  1987. /** Free all memory that we might have allocated somewhere.
  1988. * If <b>postfork</b>, we are a worker process and we want to free
  1989. * only the parts of memory that we won't touch. If !<b>postfork</b>,
  1990. * Tor is shutting down and we should free everything.
  1991. *
  1992. * Helps us find the real leaks with dmalloc and the like. Also valgrind
  1993. * should then report 0 reachable in its leak report (in an ideal world --
  1994. * in practice libevent, SSL, libc etc never quite free everything). */
  1995. void
  1996. tor_free_all(int postfork)
  1997. {
  1998. if (!postfork) {
  1999. evdns_shutdown(1);
  2000. }
  2001. geoip_free_all();
  2002. dirvote_free_all();
  2003. routerlist_free_all();
  2004. networkstatus_free_all();
  2005. addressmap_free_all();
  2006. dirserv_free_all();
  2007. rend_service_free_all();
  2008. rend_cache_free_all();
  2009. rend_service_authorization_free_all();
  2010. rep_hist_free_all();
  2011. dns_free_all();
  2012. clear_pending_onions();
  2013. circuit_free_all();
  2014. entry_guards_free_all();
  2015. connection_free_all();
  2016. buf_shrink_freelists(1);
  2017. memarea_clear_freelist();
  2018. nodelist_free_all();
  2019. microdesc_free_all();
  2020. if (!postfork) {
  2021. config_free_all();
  2022. router_free_all();
  2023. policies_free_all();
  2024. }
  2025. free_cell_pool();
  2026. if (!postfork) {
  2027. tor_tls_free_all();
  2028. }
  2029. /* stuff in main.c */
  2030. smartlist_free(connection_array);
  2031. smartlist_free(closeable_connection_lst);
  2032. smartlist_free(active_linked_connection_lst);
  2033. periodic_timer_free(second_timer);
  2034. if (!postfork) {
  2035. release_lockfile();
  2036. }
  2037. /* Stuff in util.c and address.c*/
  2038. if (!postfork) {
  2039. escaped(NULL);
  2040. esc_router_info(NULL);
  2041. logs_free_all(); /* free log strings. do this last so logs keep working. */
  2042. }
  2043. }
  2044. /** Do whatever cleanup is necessary before shutting Tor down. */
  2045. void
  2046. tor_cleanup(void)
  2047. {
  2048. or_options_t *options = get_options();
  2049. /* Remove our pid file. We don't care if there was an error when we
  2050. * unlink, nothing we could do about it anyways. */
  2051. if (options->command == CMD_RUN_TOR) {
  2052. time_t now = time(NULL);
  2053. if (options->PidFile)
  2054. unlink(options->PidFile);
  2055. if (accounting_is_enabled(options))
  2056. accounting_record_bandwidth_usage(now, get_or_state());
  2057. or_state_mark_dirty(get_or_state(), 0); /* force an immediate save. */
  2058. or_state_save(now);
  2059. if (authdir_mode_tests_reachability(options))
  2060. rep_hist_record_mtbf_data(now, 0);
  2061. }
  2062. #ifdef USE_DMALLOC
  2063. dmalloc_log_stats();
  2064. #endif
  2065. tor_free_all(0); /* We could move tor_free_all back into the ifdef below
  2066. later, if it makes shutdown unacceptably slow. But for
  2067. now, leave it here: it's helped us catch bugs in the
  2068. past. */
  2069. crypto_global_cleanup();
  2070. #ifdef USE_DMALLOC
  2071. dmalloc_log_unfreed();
  2072. dmalloc_shutdown();
  2073. #endif
  2074. }
  2075. /** Read/create keys as needed, and echo our fingerprint to stdout. */
  2076. /* static */ int
  2077. do_list_fingerprint(void)
  2078. {
  2079. char buf[FINGERPRINT_LEN+1];
  2080. crypto_pk_env_t *k;
  2081. const char *nickname = get_options()->Nickname;
  2082. if (!server_mode(get_options())) {
  2083. log_err(LD_GENERAL,
  2084. "Clients don't have long-term identity keys. Exiting.\n");
  2085. return -1;
  2086. }
  2087. tor_assert(nickname);
  2088. if (init_keys() < 0) {
  2089. log_err(LD_BUG,"Error initializing keys; can't display fingerprint");
  2090. return -1;
  2091. }
  2092. if (!(k = get_identity_key())) {
  2093. log_err(LD_GENERAL,"Error: missing identity key.");
  2094. return -1;
  2095. }
  2096. if (crypto_pk_get_fingerprint(k, buf, 1)<0) {
  2097. log_err(LD_BUG, "Error computing fingerprint");
  2098. return -1;
  2099. }
  2100. printf("%s %s\n", nickname, buf);
  2101. return 0;
  2102. }
  2103. /** Entry point for password hashing: take the desired password from
  2104. * the command line, and print its salted hash to stdout. **/
  2105. /* static */ void
  2106. do_hash_password(void)
  2107. {
  2108. char output[256];
  2109. char key[S2K_SPECIFIER_LEN+DIGEST_LEN];
  2110. crypto_rand(key, S2K_SPECIFIER_LEN-1);
  2111. key[S2K_SPECIFIER_LEN-1] = (uint8_t)96; /* Hash 64 K of data. */
  2112. secret_to_key(key+S2K_SPECIFIER_LEN, DIGEST_LEN,
  2113. get_options()->command_arg, strlen(get_options()->command_arg),
  2114. key);
  2115. base16_encode(output, sizeof(output), key, sizeof(key));
  2116. printf("16:%s\n",output);
  2117. }
  2118. #if defined (WINCE)
  2119. int
  2120. find_flashcard_path(PWCHAR path, size_t size)
  2121. {
  2122. WIN32_FIND_DATA d = {0};
  2123. HANDLE h = NULL;
  2124. if (!path)
  2125. return -1;
  2126. h = FindFirstFlashCard(&d);
  2127. if (h == INVALID_HANDLE_VALUE)
  2128. return -1;
  2129. if (wcslen(d.cFileName) == 0) {
  2130. FindClose(h);
  2131. return -1;
  2132. }
  2133. wcsncpy(path,d.cFileName,size);
  2134. FindClose(h);
  2135. return 0;
  2136. }
  2137. #endif
  2138. /** Main entry point for the Tor process. Called from main(). */
  2139. /* This function is distinct from main() only so we can link main.c into
  2140. * the unittest binary without conflicting with the unittests' main. */
  2141. int
  2142. tor_main(int argc, char *argv[])
  2143. {
  2144. int result = 0;
  2145. #if defined (WINCE)
  2146. WCHAR path [MAX_PATH] = {0};
  2147. WCHAR fullpath [MAX_PATH] = {0};
  2148. PWCHAR p = NULL;
  2149. FILE* redir = NULL;
  2150. FILE* redirdbg = NULL;
  2151. // this is to facilitate debugging by opening
  2152. // a file on a folder shared by the wm emulator.
  2153. // if no flashcard (real or emulated) is present,
  2154. // log files will be written in the root folder
  2155. if (find_flashcard_path(path,MAX_PATH) == -1)
  2156. {
  2157. redir = _wfreopen( L"\\stdout.log", L"w", stdout );
  2158. redirdbg = _wfreopen( L"\\stderr.log", L"w", stderr );
  2159. } else {
  2160. swprintf(fullpath,L"\\%s\\tor",path);
  2161. CreateDirectory(fullpath,NULL);
  2162. swprintf(fullpath,L"\\%s\\tor\\stdout.log",path);
  2163. redir = _wfreopen( fullpath, L"w", stdout );
  2164. swprintf(fullpath,L"\\%s\\tor\\stderr.log",path);
  2165. redirdbg = _wfreopen( fullpath, L"w", stderr );
  2166. }
  2167. #endif
  2168. update_approx_time(time(NULL));
  2169. tor_threads_init();
  2170. init_logging();
  2171. #ifdef USE_DMALLOC
  2172. {
  2173. /* Instruct OpenSSL to use our internal wrappers for malloc,
  2174. realloc and free. */
  2175. int r = CRYPTO_set_mem_ex_functions(_tor_malloc, _tor_realloc, _tor_free);
  2176. tor_assert(r);
  2177. }
  2178. #endif
  2179. #ifdef NT_SERVICE
  2180. {
  2181. int done = 0;
  2182. result = nt_service_parse_options(argc, argv, &done);
  2183. if (done) return result;
  2184. }
  2185. #endif
  2186. if (tor_init(argc, argv)<0)
  2187. return -1;
  2188. switch (get_options()->command) {
  2189. case CMD_RUN_TOR:
  2190. #ifdef NT_SERVICE
  2191. nt_service_set_state(SERVICE_RUNNING);
  2192. #endif
  2193. result = do_main_loop();
  2194. break;
  2195. case CMD_LIST_FINGERPRINT:
  2196. result = do_list_fingerprint();
  2197. break;
  2198. case CMD_HASH_PASSWORD:
  2199. do_hash_password();
  2200. result = 0;
  2201. break;
  2202. case CMD_VERIFY_CONFIG:
  2203. printf("Configuration was valid\n");
  2204. result = 0;
  2205. break;
  2206. case CMD_RUN_UNITTESTS: /* only set by test.c */
  2207. default:
  2208. log_warn(LD_BUG,"Illegal command number %d: internal error.",
  2209. get_options()->command);
  2210. result = -1;
  2211. }
  2212. tor_cleanup();
  2213. return result;
  2214. }