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- /* Copyright 2001 Matej Pfajfar.
- * Copyright 2001-2004 Roger Dingledine.
- * Copyright 2004-2005 Roger Dingledine, Nick Mathewson. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- const char connection_c_id[] =
- "$Id$";
- /**
- * \file connection.c
- * \brief General high-level functions to handle reading and writing
- * on connections.
- **/
- #include "or.h"
- static connection_t *connection_create_listener(const char *listenaddress,
- uint16_t listenport, int type);
- static int connection_init_accepted_conn(connection_t *conn);
- static int connection_handle_listener_read(connection_t *conn, int new_type);
- static int connection_receiver_bucket_should_increase(connection_t *conn);
- static int connection_finished_flushing(connection_t *conn);
- static int connection_finished_connecting(connection_t *conn);
- static int connection_reached_eof(connection_t *conn);
- static int connection_read_to_buf(connection_t *conn, int *max_to_read);
- static int connection_process_inbuf(connection_t *conn, int package_partial);
- static void client_check_address_changed(int sock);
- static uint32_t last_interface_ip = 0;
- static smartlist_t *outgoing_addrs = NULL;
- /**************************************************************/
- /**
- * Return the human-readable name for the connection type <b>type</b>
- */
- const char *
- conn_type_to_string(int type)
- {
- static char buf[64];
- switch (type) {
- case CONN_TYPE_OR_LISTENER: return "OR listener";
- case CONN_TYPE_OR: return "OR";
- case CONN_TYPE_EXIT: return "Exit";
- case CONN_TYPE_AP_LISTENER: return "Socks listener";
- case CONN_TYPE_AP: return "Socks";
- case CONN_TYPE_DIR_LISTENER: return "Directory listener";
- case CONN_TYPE_DIR: return "Directory";
- case CONN_TYPE_DNSWORKER: return "DNS worker";
- case CONN_TYPE_CPUWORKER: return "CPU worker";
- case CONN_TYPE_CONTROL_LISTENER: return "Control listener";
- case CONN_TYPE_CONTROL: return "Control";
- default:
- warn(LD_BUG, "Bug: unknown connection type %d", type);
- tor_snprintf(buf, sizeof(buf), "unknown [%d]", type);
- return buf;
- }
- }
- /**
- * Return the human-readable name for the connection state <b>state</b>
- * for the connection type <b>type</b>
- */
- const char *
- conn_state_to_string(int type, int state)
- {
- static char buf[96];
- switch (type) {
- case CONN_TYPE_OR_LISTENER:
- case CONN_TYPE_AP_LISTENER:
- case CONN_TYPE_DIR_LISTENER:
- case CONN_TYPE_CONTROL_LISTENER:
- if (state == LISTENER_STATE_READY)
- return "ready";
- break;
- case CONN_TYPE_OR:
- switch (state) {
- case OR_CONN_STATE_CONNECTING: return "connect()ing";
- case OR_CONN_STATE_PROXY_FLUSHING: return "proxy flushing";
- case OR_CONN_STATE_PROXY_READING: return "proxy reading";
- case OR_CONN_STATE_HANDSHAKING: return "proxy reading";
- case OR_CONN_STATE_OPEN: return "open";
- }
- break;
- case CONN_TYPE_EXIT:
- switch (state) {
- case EXIT_CONN_STATE_RESOLVING: return "waiting for dest info";
- case EXIT_CONN_STATE_CONNECTING: return "connecting";
- case EXIT_CONN_STATE_OPEN: return "open";
- case EXIT_CONN_STATE_RESOLVEFAILED: return "resolve failed";
- }
- break;
- case CONN_TYPE_AP:
- switch (state) {
- case AP_CONN_STATE_SOCKS_WAIT: return "waiting for dest info";
- case AP_CONN_STATE_RENDDESC_WAIT: return "waiting for rendezvous desc";
- case AP_CONN_STATE_CONTROLLER_WAIT: return "waiting for controller";
- case AP_CONN_STATE_CIRCUIT_WAIT: return "waiting for safe circuit";
- case AP_CONN_STATE_CONNECT_WAIT: return "waiting for connect";
- case AP_CONN_STATE_RESOLVE_WAIT: return "waiting for resolve";
- case AP_CONN_STATE_OPEN: return "open";
- }
- break;
- case CONN_TYPE_DIR:
- switch (state) {
- case DIR_CONN_STATE_CONNECTING: return "connecting";
- case DIR_CONN_STATE_CLIENT_SENDING: return "client sending";
- case DIR_CONN_STATE_CLIENT_READING: return "cleint reading";
- case DIR_CONN_STATE_SERVER_COMMAND_WAIT: return "waiting for command";
- case DIR_CONN_STATE_SERVER_WRITING: return "writing";
- }
- break;
- case CONN_TYPE_DNSWORKER:
- switch (state) {
- case DNSWORKER_STATE_IDLE: return "idle";
- case DNSWORKER_STATE_BUSY: return "busy";
- }
- break;
- case CONN_TYPE_CPUWORKER:
- switch (state) {
- case CPUWORKER_STATE_IDLE: return "idle";
- case CPUWORKER_STATE_BUSY_ONION: return "busy with onion";
- }
- break;
- case CONN_TYPE_CONTROL:
- switch (state) {
- case CONTROL_CONN_STATE_OPEN_V0: return "open (protocol v0)";
- case CONTROL_CONN_STATE_OPEN_V1: return "open (protocol v1)";
- case CONTROL_CONN_STATE_NEEDAUTH_V0:
- return "waiting for authentication (protocol unknown)";
- case CONTROL_CONN_STATE_NEEDAUTH_V1:
- return "waiting for authentication (protocol v1)";
- }
- break;
- }
- warn(LD_BUG, "Bug: unknown connection state %d (type %d)", state, type);
- tor_snprintf(buf, sizeof(buf),
- "unknown state [%d] on unknown [%s] connection",
- state, conn_type_to_string(type));
- return buf;
- }
- /** Allocate space for a new connection_t. This function just initializes
- * conn; you must call connection_add() to link it into the main array.
- *
- * Set conn-\>type to <b>type</b>. Set conn-\>s and conn-\>poll_index to
- * -1 to signify they are not yet assigned.
- *
- * If conn is not a listener type, allocate buffers for it. If it's
- * an AP type, allocate space to store the socks_request.
- *
- * Assign a pseudorandom next_circ_id between 0 and 2**15.
- *
- * Initialize conn's timestamps to now.
- */
- connection_t *
- connection_new(int type)
- {
- static uint32_t n_connections_allocated = 0;
- connection_t *conn;
- time_t now = time(NULL);
- conn = tor_malloc_zero(sizeof(connection_t));
- conn->magic = CONNECTION_MAGIC;
- conn->s = -1; /* give it a default of 'not used' */
- conn->poll_index = -1; /* also default to 'not used' */
- conn->global_identifier = n_connections_allocated++;
- conn->type = type;
- if (!connection_is_listener(conn)) { /* listeners never use their buf */
- conn->inbuf = buf_new();
- conn->outbuf = buf_new();
- }
- if (type == CONN_TYPE_AP) {
- conn->socks_request = tor_malloc_zero(sizeof(socks_request_t));
- }
- conn->next_circ_id = crypto_rand_int(1<<15);
- conn->timestamp_created = now;
- conn->timestamp_lastread = now;
- conn->timestamp_lastwritten = now;
- return conn;
- }
- /** Tell libevent that we don't care about <b>conn</b> any more. */
- void
- connection_unregister(connection_t *conn)
- {
- if (conn->read_event) {
- if (event_del(conn->read_event))
- warn(LD_BUG, "Error removing read event for %d", conn->s);
- tor_free(conn->read_event);
- }
- if (conn->write_event) {
- if (event_del(conn->write_event))
- warn(LD_BUG, "Error removing write event for %d", conn->s);
- tor_free(conn->write_event);
- }
- }
- /** Deallocate memory used by <b>conn</b>. Deallocate its buffers if
- * necessary, close its socket if necessary, and mark the directory as dirty
- * if <b>conn</b> is an OR or OP connection.
- */
- static void
- _connection_free(connection_t *conn)
- {
- tor_assert(conn->magic == CONNECTION_MAGIC);
- if (!connection_is_listener(conn)) {
- buf_free(conn->inbuf);
- buf_free(conn->outbuf);
- }
- tor_free(conn->address);
- tor_free(conn->chosen_exit_name);
- if (connection_speaks_cells(conn)) {
- if (conn->tls) {
- tor_tls_free(conn->tls);
- conn->tls = NULL;
- }
- }
- if (conn->identity_pkey)
- crypto_free_pk_env(conn->identity_pkey);
- tor_free(conn->nickname);
- tor_free(conn->socks_request);
- tor_free(conn->incoming_cmd);
- tor_free(conn->read_event); /* Probably already freed by connection_free. */
- tor_free(conn->write_event); /* Probably already freed by connection_free. */
- tor_free(conn->requested_resource);
- if (conn->s >= 0) {
- debug(LD_NET,"closing fd %d.",conn->s);
- tor_close_socket(conn->s);
- }
- if (conn->type == CONN_TYPE_OR &&
- !tor_digest_is_zero(conn->identity_digest)) {
- warn(LD_BUG, "called on OR conn with non-zeroed idenity_digest");
- connection_or_remove_from_identity_map(conn);
- }
- memset(conn, 0xAA, sizeof(connection_t)); /* poison memory */
- tor_free(conn);
- }
- /** Make sure <b>conn</b> isn't in any of the global conn lists; then free it.
- */
- void
- connection_free(connection_t *conn)
- {
- tor_assert(conn);
- tor_assert(!connection_is_on_closeable_list(conn));
- tor_assert(!connection_in_array(conn));
- if (connection_speaks_cells(conn)) {
- if (conn->state == OR_CONN_STATE_OPEN)
- directory_set_dirty();
- if (!tor_digest_is_zero(conn->identity_digest)) {
- connection_or_remove_from_identity_map(conn);
- }
- }
- if (conn->type == CONN_TYPE_CONTROL) {
- conn->event_mask = 0;
- control_update_global_event_mask();
- }
- connection_unregister(conn);
- _connection_free(conn);
- }
- /** Call _connection_free() on every connection in our array, and release all
- * storage helpd by connection.c. This is used by cpuworkers and dnsworkers
- * when they fork, so they don't keep resources held open (especially
- * sockets).
- *
- * Don't do the checks in connection_free(), because they will
- * fail.
- */
- void
- connection_free_all(void)
- {
- int i, n;
- connection_t **carray;
- get_connection_array(&carray,&n);
- /* We don't want to log any messages to controllers. */
- for (i=0;i<n;i++)
- if (carray[i]->type == CONN_TYPE_CONTROL)
- carray[i]->event_mask = 0;
- control_update_global_event_mask();
- /* Unlink everything from the identity map. */
- connection_or_clear_identity_map();
- for (i=0;i<n;i++)
- _connection_free(carray[i]);
- if (outgoing_addrs) {
- SMARTLIST_FOREACH(outgoing_addrs, void*, addr, tor_free(addr));
- smartlist_free(outgoing_addrs);
- outgoing_addrs = NULL;
- }
- }
- /** Do any cleanup needed:
- * - Directory conns that failed to fetch a rendezvous descriptor
- * need to inform pending rendezvous streams.
- * - OR conns need to call rep_hist_note_*() to record status.
- * - AP conns need to send a socks reject if necessary.
- * - Exit conns need to call connection_dns_remove() if necessary.
- * - AP and Exit conns need to send an end cell if they can.
- * - DNS conns need to fail any resolves that are pending on them.
- */
- void
- connection_about_to_close_connection(connection_t *conn)
- {
- circuit_t *circ;
- assert(conn->marked_for_close);
- if (CONN_IS_EDGE(conn)) {
- if (!conn->has_sent_end) {
- warn(LD_BUG, "Harmless bug: Edge connection (marked at %s:%d) "
- "hasn't sent end yet?",
- conn->marked_for_close_file, conn->marked_for_close);
- tor_fragile_assert();
- }
- }
- switch (conn->type) {
- case CONN_TYPE_DIR:
- if (conn->state < DIR_CONN_STATE_CLIENT_FINISHED) {
- /* It's a directory connection and connecting or fetching
- * failed: forget about this router, and maybe try again. */
- connection_dir_request_failed(conn);
- }
- if (conn->purpose == DIR_PURPOSE_FETCH_RENDDESC)
- rend_client_desc_here(conn->rend_query); /* give it a try */
- break;
- case CONN_TYPE_OR:
- /* Remember why we're closing this connection. */
- if (conn->state != OR_CONN_STATE_OPEN) {
- if (connection_or_nonopen_was_started_here(conn)) {
- rep_hist_note_connect_failed(conn->identity_digest, time(NULL));
- helper_node_set_status(conn->identity_digest, 0);
- control_event_or_conn_status(conn, OR_CONN_EVENT_FAILED);
- }
- } else if (conn->hold_open_until_flushed) {
- /* XXXX009 We used to have an arg that told us whether we closed the
- * connection on purpose or not. Can we use hold_open_until_flushed
- * instead? We only set it when we are intentionally closing a
- * connection. -NM
- *
- * (Of course, now things we set to close which expire rather than
- * flushing still get noted as dead, not disconnected. But this is an
- * improvement. -NM
- */
- rep_hist_note_disconnect(conn->identity_digest, time(NULL));
- control_event_or_conn_status(conn, OR_CONN_EVENT_CLOSED);
- } else if (conn->identity_digest) {
- rep_hist_note_connection_died(conn->identity_digest, time(NULL));
- control_event_or_conn_status(conn, OR_CONN_EVENT_CLOSED);
- }
- break;
- case CONN_TYPE_AP:
- if (conn->socks_request->has_finished == 0) {
- /* since conn gets removed right after this function finishes,
- * there's no point trying to send back a reply at this point. */
- warn(LD_BUG,"Bug: Closing stream (marked at %s:%d) without sending"
- " back a socks reply.",
- conn->marked_for_close_file, conn->marked_for_close);
- } else {
- control_event_stream_status(conn, STREAM_EVENT_CLOSED);
- }
- break;
- case CONN_TYPE_EXIT:
- if (conn->state == EXIT_CONN_STATE_RESOLVING) {
- circ = circuit_get_by_edge_conn(conn);
- if (circ)
- circuit_detach_stream(circ, conn);
- connection_dns_remove(conn);
- }
- break;
- case CONN_TYPE_DNSWORKER:
- if (conn->state == DNSWORKER_STATE_BUSY) {
- dns_cancel_pending_resolve(conn->address);
- }
- break;
- }
- }
- /** Close the underlying socket for <b>conn</b>, so we don't try to
- * flush it. Must be used in conjunction with (right before)
- * connection_mark_for_close().
- */
- void
- connection_close_immediate(connection_t *conn)
- {
- assert_connection_ok(conn,0);
- if (conn->s < 0) {
- err(LD_BUG,"Bug: Attempt to close already-closed connection.");
- tor_fragile_assert();
- return;
- }
- if (conn->outbuf_flushlen) {
- info(LD_NET,"fd %d, type %s, state %s, %d bytes on outbuf.",
- conn->s, conn_type_to_string(conn->type),
- conn_state_to_string(conn->type, conn->state),
- (int)conn->outbuf_flushlen);
- }
- connection_unregister(conn);
- tor_close_socket(conn->s);
- conn->s = -1;
- if (!connection_is_listener(conn)) {
- buf_clear(conn->outbuf);
- conn->outbuf_flushlen = 0;
- }
- }
- /** Mark <b>conn</b> to be closed next time we loop through
- * conn_close_if_marked() in main.c. */
- void
- _connection_mark_for_close(connection_t *conn, int line, const char *file)
- {
- assert_connection_ok(conn,0);
- tor_assert(line);
- tor_assert(file);
- if (conn->marked_for_close) {
- log(LOG_WARN,LD_BUG,"Duplicate call to connection_mark_for_close at %s:%d"
- " (first at %s:%d)", file, line, conn->marked_for_close_file,
- conn->marked_for_close);
- tor_fragile_assert();
- return;
- }
- conn->marked_for_close = line;
- conn->marked_for_close_file = file;
- add_connection_to_closeable_list(conn);
- /* in case we're going to be held-open-til-flushed, reset
- * the number of seconds since last successful write, so
- * we get our whole 15 seconds */
- conn->timestamp_lastwritten = time(NULL);
- }
- /** Find each connection that has hold_open_until_flushed set to
- * 1 but hasn't written in the past 15 seconds, and set
- * hold_open_until_flushed to 0. This means it will get cleaned
- * up in the next loop through close_if_marked() in main.c.
- */
- void
- connection_expire_held_open(void)
- {
- connection_t **carray, *conn;
- int n, i;
- time_t now;
- now = time(NULL);
- get_connection_array(&carray, &n);
- for (i = 0; i < n; ++i) {
- conn = carray[i];
- /* If we've been holding the connection open, but we haven't written
- * for 15 seconds...
- */
- if (conn->hold_open_until_flushed) {
- tor_assert(conn->marked_for_close);
- if (now - conn->timestamp_lastwritten >= 15) {
- int severity;
- if (conn->type == CONN_TYPE_EXIT ||
- (conn->type == CONN_TYPE_DIR &&
- conn->purpose == DIR_PURPOSE_SERVER))
- severity = LOG_INFO;
- else
- severity = LOG_NOTICE;
- log_fn(severity, LD_NET,
- "Giving up on marked_for_close conn that's been flushing "
- "for 15s (fd %d, type %s, state %s).",
- conn->s, conn_type_to_string(conn->type),
- conn_state_to_string(conn->type, conn->state));
- conn->hold_open_until_flushed = 0;
- }
- }
- }
- }
- /** Bind a new non-blocking socket listening to
- * <b>listenaddress</b>:<b>listenport</b>, and add this new connection
- * (of type <b>type</b>) to the connection array.
- *
- * If <b>listenaddress</b> includes a port, we bind on that port;
- * otherwise, we use listenport.
- */
- static connection_t *
- connection_create_listener(const char *listenaddress, uint16_t listenport,
- int type)
- {
- struct sockaddr_in listenaddr; /* where to bind */
- char *address = NULL;
- connection_t *conn;
- uint16_t usePort;
- uint32_t addr;
- int s; /* the socket we're going to make */
- #ifndef MS_WINDOWS
- int one=1;
- #endif
- memset(&listenaddr,0,sizeof(struct sockaddr_in));
- if (parse_addr_port(listenaddress, &address, &addr, &usePort)<0) {
- warn(LD_CONFIG, "Error parsing/resolving ListenAddress %s",listenaddress);
- return NULL;
- }
- if (usePort==0)
- usePort = listenport;
- listenaddr.sin_addr.s_addr = htonl(addr);
- listenaddr.sin_family = AF_INET;
- listenaddr.sin_port = htons((uint16_t) usePort);
- notice(LD_NET, "Opening %s on %s:%d",
- conn_type_to_string(type), address, usePort);
- s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
- if (s < 0) {
- warn(LD_NET,"Socket creation failed.");
- goto err;
- } else if (!SOCKET_IS_POLLABLE(s)) {
- warn(LD_NET,"Too many connections; can't create pollable listener.");
- tor_close_socket(s);
- goto err;
- }
- #ifndef MS_WINDOWS
- /* REUSEADDR on normal places means you can rebind to the port
- * right after somebody else has let it go. But REUSEADDR on win32
- * means you can bind to the port _even when somebody else
- * already has it bound_. So, don't do that on Win32. */
- setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*) &one, sizeof(one));
- #endif
- if (bind(s,(struct sockaddr *)&listenaddr,sizeof(listenaddr)) < 0) {
- warn(LD_NET, "Could not bind to %s:%u: %s", address, usePort,
- tor_socket_strerror(tor_socket_errno(s)));
- goto err;
- }
- if (listen(s,SOMAXCONN) < 0) {
- warn(LD_NET, "Could not listen on %s:%u: %s", address, usePort,
- tor_socket_strerror(tor_socket_errno(s)));
- goto err;
- }
- set_socket_nonblocking(s);
- conn = connection_new(type);
- conn->s = s;
- conn->address = address;
- address = NULL;
- conn->port = usePort;
- if (connection_add(conn) < 0) { /* no space, forget it */
- warn(LD_NET,"connection_add failed. Giving up.");
- connection_free(conn);
- goto err;
- }
- debug(LD_NET,"%s listening on port %u.",conn_type_to_string(type), usePort);
- conn->state = LISTENER_STATE_READY;
- connection_start_reading(conn);
- return conn;
- err:
- tor_free(address);
- return NULL;
- }
- /** Do basic sanity checking on a newly received socket. Return 0
- * if it looks ok, else return -1. */
- static int
- check_sockaddr_in(struct sockaddr *sa, int len, int level)
- {
- int ok = 1;
- struct sockaddr_in *sin=(struct sockaddr_in*)sa;
- if (len != sizeof(struct sockaddr_in)) {
- log_fn(level, LD_NET, "Length of address not as expected: %d vs %d",
- len,(int)sizeof(struct sockaddr_in));
- ok = 0;
- }
- if (sa->sa_family != AF_INET) {
- log_fn(level, LD_NET, "Family of address not as expected: %d vs %d",
- sa->sa_family, AF_INET);
- ok = 0;
- }
- if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0) {
- log_fn(level, LD_NET,
- "Address for new connection has address/port equal to zero.");
- ok = 0;
- }
- return ok ? 0 : -1;
- }
- /** The listener connection <b>conn</b> told poll() it wanted to read.
- * Call accept() on conn-\>s, and add the new connection if necessary.
- */
- static int
- connection_handle_listener_read(connection_t *conn, int new_type)
- {
- int news; /* the new socket */
- connection_t *newconn;
- /* information about the remote peer when connecting to other routers */
- struct sockaddr_in remote;
- char addrbuf[256];
- /* length of the remote address. Must be whatever accept() needs. */
- socklen_t remotelen = 256;
- char tmpbuf[INET_NTOA_BUF_LEN];
- tor_assert((size_t)remotelen >= sizeof(struct sockaddr_in));
- memset(addrbuf, 0, sizeof(addrbuf));
- news = accept(conn->s,(struct sockaddr *)&addrbuf,&remotelen);
- if (!SOCKET_IS_POLLABLE(news)) {
- /* accept() error, or too many conns to poll */
- int e;
- if (news>=0) {
- /* Too many conns to poll. */
- warn(LD_NET,"Too many connections; couldn't accept connection.");
- tor_close_socket(news);
- return 0;
- }
- e = tor_socket_errno(conn->s);
- if (ERRNO_IS_ACCEPT_EAGAIN(e)) {
- return 0; /* he hung up before we could accept(). that's fine. */
- } else if (ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e)) {
- notice(LD_NET,"accept failed: %s. Dropping incoming connection.",
- tor_socket_strerror(e));
- return 0;
- }
- /* else there was a real error. */
- warn(LD_NET,"accept() failed: %s. Closing listener.",
- tor_socket_strerror(e));
- connection_mark_for_close(conn);
- return -1;
- }
- debug(LD_NET,"Connection accepted on socket %d (child of fd %d).",
- news,conn->s);
- set_socket_nonblocking(news);
- if (check_sockaddr_in((struct sockaddr*)addrbuf, remotelen, LOG_INFO)<0) {
- info(LD_NET, "accept() returned a strange address; trying getsockname().");
- remotelen=256;
- memset(addrbuf, 0, sizeof(addrbuf));
- if (getsockname(news, (struct sockaddr*)addrbuf, &remotelen)<0) {
- warn(LD_NET, "getsockname() failed.");
- } else {
- if (check_sockaddr_in((struct sockaddr*)addrbuf, remotelen,
- LOG_WARN) < 0) {
- warn(LD_NET,"Something's wrong with this conn. Closing it.");
- tor_close_socket(news);
- return 0;
- }
- }
- }
- memcpy(&remote, addrbuf, sizeof(struct sockaddr_in));
- /* process entrance policies here, before we even create the connection */
- if (new_type == CONN_TYPE_AP) {
- /* check sockspolicy to see if we should accept it */
- if (socks_policy_permits_address(ntohl(remote.sin_addr.s_addr)) == 0) {
- tor_inet_ntoa(&remote.sin_addr, tmpbuf, sizeof(tmpbuf));
- notice(LD_APP,"Denying socks connection from untrusted address %s.",
- tmpbuf);
- tor_close_socket(news);
- return 0;
- }
- }
- if (new_type == CONN_TYPE_DIR) {
- /* check dirpolicy to see if we should accept it */
- if (dir_policy_permits_address(ntohl(remote.sin_addr.s_addr)) == 0) {
- tor_inet_ntoa(&remote.sin_addr, tmpbuf, sizeof(tmpbuf));
- notice(LD_DIRSERV,"Denying dir connection from address %s.",
- tmpbuf);
- tor_close_socket(news);
- return 0;
- }
- }
- newconn = connection_new(new_type);
- newconn->s = news;
- /* remember the remote address */
- newconn->addr = ntohl(remote.sin_addr.s_addr);
- newconn->port = ntohs(remote.sin_port);
- newconn->address = tor_dup_addr(newconn->addr);
- if (connection_add(newconn) < 0) { /* no space, forget it */
- connection_free(newconn);
- return 0; /* no need to tear down the parent */
- }
- if (connection_init_accepted_conn(newconn) < 0) {
- connection_mark_for_close(newconn);
- return 0;
- }
- return 0;
- }
- /** Initialize states for newly accepted connection <b>conn</b>.
- * If conn is an OR, start the tls handshake.
- */
- static int
- connection_init_accepted_conn(connection_t *conn)
- {
- connection_start_reading(conn);
- switch (conn->type) {
- case CONN_TYPE_OR:
- return connection_tls_start_handshake(conn, 1);
- case CONN_TYPE_AP:
- conn->state = AP_CONN_STATE_SOCKS_WAIT;
- break;
- case CONN_TYPE_DIR:
- conn->purpose = DIR_PURPOSE_SERVER;
- conn->state = DIR_CONN_STATE_SERVER_COMMAND_WAIT;
- break;
- case CONN_TYPE_CONTROL:
- conn->state = CONTROL_CONN_STATE_NEEDAUTH_V0;
- break;
- }
- return 0;
- }
- /** Take conn, make a nonblocking socket; try to connect to
- * addr:port (they arrive in *host order*). If fail, return -1. Else
- * assign s to conn-\>s: if connected return 1, if EAGAIN return 0.
- *
- * address is used to make the logs useful.
- *
- * On success, add conn to the list of polled connections.
- */
- int
- connection_connect(connection_t *conn, char *address,
- uint32_t addr, uint16_t port)
- {
- int s, inprogress = 0;
- struct sockaddr_in dest_addr;
- or_options_t *options = get_options();
- s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
- if (s < 0) {
- warn(LD_NET,"Error creating network socket: %s",
- tor_socket_strerror(tor_socket_errno(-1)));
- return -1;
- } else if (!SOCKET_IS_POLLABLE(s)) {
- warn(LD_NET,
- "Too many connections; can't create pollable connection to %s",
- safe_str(address));
- tor_close_socket(s);
- return -1;
- }
- if (options->OutboundBindAddress) {
- struct sockaddr_in ext_addr;
- memset(&ext_addr, 0, sizeof(ext_addr));
- ext_addr.sin_family = AF_INET;
- ext_addr.sin_port = 0;
- if (!tor_inet_aton(options->OutboundBindAddress, &ext_addr.sin_addr)) {
- warn(LD_CONFIG,"Outbound bind address '%s' didn't parse. Ignoring.",
- options->OutboundBindAddress);
- } else {
- if (bind(s, (struct sockaddr*)&ext_addr, sizeof(ext_addr)) < 0) {
- warn(LD_NET,"Error binding network socket: %s",
- tor_socket_strerror(tor_socket_errno(s)));
- return -1;
- }
- }
- }
- set_socket_nonblocking(s);
- memset(&dest_addr,0,sizeof(dest_addr));
- dest_addr.sin_family = AF_INET;
- dest_addr.sin_port = htons(port);
- dest_addr.sin_addr.s_addr = htonl(addr);
- debug(LD_NET,"Connecting to %s:%u.",safe_str(address),port);
- if (connect(s,(struct sockaddr *)&dest_addr,sizeof(dest_addr)) < 0) {
- int e = tor_socket_errno(s);
- if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
- /* yuck. kill it. */
- info(LD_NET,"connect() to %s:%u failed: %s",safe_str(address),port,
- tor_socket_strerror(e));
- tor_close_socket(s);
- return -1;
- } else {
- inprogress = 1;
- }
- }
- if (!server_mode(options))
- client_check_address_changed(s);
- /* it succeeded. we're connected. */
- log_fn(inprogress?LOG_DEBUG:LOG_INFO, LD_NET,
- "Connection to %s:%u %s (sock %d).",safe_str(address),port,
- inprogress?"in progress":"established",s);
- conn->s = s;
- if (connection_add(conn) < 0) /* no space, forget it */
- return -1;
- return inprogress ? 0 : 1;
- }
- /**
- * Launch any configured listener connections of type <b>type</b>. (A
- * listener is configured if <b>port_option</b> is non-zero. If any
- * ListenAddress configuration options are given in <b>cfg</b>, create a
- * connection binding to each one. Otherwise, create a single
- * connection binding to the address <b>default_addr</b>.)
- *
- * If <b>force</b> is true, close and re-open all listener connections.
- * Otherwise, only relaunch the listeners of this type if the number of
- * existing connections is not as configured (e.g., because one died),
- * or if the existing connections do not match those configured.
- *
- * Add all old conns that should be closed to <b>replaced_conns</b>.
- * Add all new connections to <b>new_conns</b>.
- */
- static int
- retry_listeners(int type, config_line_t *cfg,
- int port_option, const char *default_addr, int force,
- smartlist_t *replaced_conns,
- smartlist_t *new_conns)
- {
- smartlist_t *launch = smartlist_create();
- int free_launch_elts = 1;
- config_line_t *c;
- int n_conn, i;
- connection_t *conn;
- connection_t **carray;
- config_line_t *line;
- if (cfg && port_option) {
- for (c = cfg; c; c = c->next) {
- smartlist_add(launch, c);
- }
- free_launch_elts = 0;
- } else if (port_option) {
- line = tor_malloc_zero(sizeof(config_line_t));
- line->key = tor_strdup("");
- line->value = tor_strdup(default_addr);
- smartlist_add(launch, line);
- }
- /*
- SMARTLIST_FOREACH(launch, config_line_t *, l,
- log_fn(LOG_NOTICE, "#%s#%s", l->key, l->value));
- */
- get_connection_array(&carray,&n_conn);
- for (i=0; i < n_conn; ++i) {
- conn = carray[i];
- if (conn->type != type || conn->marked_for_close)
- continue;
- if (force) {
- /* It's a listener, and we're relaunching all listeners of this
- * type. Close this one. */
- log_fn(LOG_NOTICE, LD_NET, "Closing %s on %s:%d",
- conn_type_to_string(type), conn->address, conn->port);
- connection_close_immediate(conn);
- connection_mark_for_close(conn);
- continue;
- }
- /* Okay, so this is a listener. Is it configured? */
- line = NULL;
- SMARTLIST_FOREACH(launch, config_line_t *, wanted,
- {
- char *address=NULL;
- uint16_t port;
- if (! parse_addr_port(wanted->value, &address, NULL, &port)) {
- int addr_matches = !strcasecmp(address, conn->address);
- tor_free(address);
- if (! port)
- port = port_option;
- if (port == conn->port && addr_matches) {
- line = wanted;
- break;
- }
- }
- });
- if (! line) {
- /* This one isn't configured. Close it. */
- notice(LD_NET, "Closing %s on %s:%d",
- conn_type_to_string(type), conn->address, conn->port);
- if (replaced_conns) {
- smartlist_add(replaced_conns, conn);
- } else {
- connection_close_immediate(conn);
- connection_mark_for_close(conn);
- }
- } else {
- /* It's configured; we don't need to launch it. */
- // debug(LD_NET, "Already have %s on %s:%d",
- // conn_type_to_string(type), conn->address, conn->port);
- smartlist_remove(launch, line);
- if (free_launch_elts)
- config_free_lines(line);
- }
- }
- /* Now open all the listeners that are configured but not opened. */
- i = 0;
- SMARTLIST_FOREACH(launch, config_line_t *, cfg,
- {
- conn = connection_create_listener(cfg->value, (uint16_t) port_option,
- type);
- if (!conn) {
- i = -1;
- } else {
- if (new_conns)
- smartlist_add(new_conns, conn);
- }
- });
- if (free_launch_elts) {
- SMARTLIST_FOREACH(launch, config_line_t *, cfg,
- config_free_lines(cfg));
- }
- smartlist_free(launch);
- return i;
- }
- /** (Re)launch listeners for each port you should have open. If
- * <b>force</b> is true, close and relaunch all listeners. If <b>force</b>
- * is false, then only relaunch listeners when we have the wrong number of
- * connections for a given type.
- *
- * Add all old conns that should be closed to <b>replaced_conns</b>.
- * Add all new connections to <b>new_conns</b>.
- */
- int
- retry_all_listeners(int force, smartlist_t *replaced_conns,
- smartlist_t *new_conns)
- {
- or_options_t *options = get_options();
- if (server_mode(options) &&
- retry_listeners(CONN_TYPE_OR_LISTENER, options->ORListenAddress,
- options->ORPort, "0.0.0.0", force,
- replaced_conns, new_conns)<0)
- return -1;
- if (retry_listeners(CONN_TYPE_DIR_LISTENER, options->DirListenAddress,
- options->DirPort, "0.0.0.0", force,
- replaced_conns, new_conns)<0)
- return -1;
- if (retry_listeners(CONN_TYPE_AP_LISTENER, options->SocksListenAddress,
- options->SocksPort, "127.0.0.1", force,
- replaced_conns, new_conns)<0)
- return -1;
- if (retry_listeners(CONN_TYPE_CONTROL_LISTENER, NULL,
- options->ControlPort, "127.0.0.1", force,
- replaced_conns, new_conns)<0)
- return -1;
- return 0;
- }
- extern int global_read_bucket, global_write_bucket;
- /** How many bytes at most can we read onto this connection? */
- static int
- connection_bucket_read_limit(connection_t *conn)
- {
- int at_most;
- /* do a rudimentary round-robin so one circuit can't hog a connection */
- if (connection_speaks_cells(conn)) {
- at_most = 32*(CELL_NETWORK_SIZE);
- } else {
- at_most = 32*(RELAY_PAYLOAD_SIZE);
- }
- if (at_most > global_read_bucket)
- at_most = global_read_bucket;
- if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN)
- if (at_most > conn->receiver_bucket)
- at_most = conn->receiver_bucket;
- if (at_most < 0)
- return 0;
- return at_most;
- }
- /** How many bytes at most can we write onto this connection? */
- int
- connection_bucket_write_limit(connection_t *conn)
- {
- unsigned int at_most;
- /* do a rudimentary round-robin so one circuit can't hog a connection */
- if (connection_speaks_cells(conn)) {
- at_most = 32*(CELL_NETWORK_SIZE);
- } else {
- at_most = 32*(RELAY_PAYLOAD_SIZE);
- }
- if (at_most > conn->outbuf_flushlen)
- at_most = conn->outbuf_flushlen;
- #if 0 /* don't enable til we actually do write limiting */
- if (at_most > global_write_bucket)
- at_most = global_write_bucket;
- #endif
- return at_most;
- }
- /** We just read num_read onto conn. Decrement buckets appropriately. */
- static void
- connection_read_bucket_decrement(connection_t *conn, int num_read)
- {
- global_read_bucket -= num_read;
- //tor_assert(global_read_bucket >= 0);
- if (connection_speaks_cells(conn) && conn->state == OR_CONN_STATE_OPEN) {
- conn->receiver_bucket -= num_read;
- //tor_assert(conn->receiver_bucket >= 0);
- }
- }
- /** DOCDOC */
- static void
- connection_consider_empty_buckets(connection_t *conn)
- {
- if (global_read_bucket <= 0) {
- LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,"global bucket exhausted. Pausing."));
- conn->wants_to_read = 1;
- connection_stop_reading(conn);
- return;
- }
- if (connection_speaks_cells(conn) &&
- conn->state == OR_CONN_STATE_OPEN &&
- conn->receiver_bucket <= 0) {
- LOG_FN_CONN(conn,
- (LOG_DEBUG,LD_NET,"receiver bucket exhausted. Pausing."));
- conn->wants_to_read = 1;
- connection_stop_reading(conn);
- }
- }
- /** Initialize the global read bucket to options->BandwidthBurst,
- * and current_time to the current time. */
- void
- connection_bucket_init(void)
- {
- or_options_t *options = get_options();
- /* start it at max traffic */
- global_read_bucket = (int)options->BandwidthBurst;
- global_write_bucket = (int)options->BandwidthBurst;
- }
- /** A second has rolled over; increment buckets appropriately. */
- void
- connection_bucket_refill(struct timeval *now)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- or_options_t *options = get_options();
- /* refill the global buckets */
- if (global_read_bucket < (int)options->BandwidthBurst) {
- global_read_bucket += (int)options->BandwidthRate;
- debug(LD_NET,"global_read_bucket now %d.", global_read_bucket);
- }
- if (global_write_bucket < (int)options->BandwidthBurst) {
- global_write_bucket += (int)options->BandwidthRate;
- debug(LD_NET,"global_write_bucket now %d.", global_write_bucket);
- }
- /* refill the per-connection buckets */
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (connection_receiver_bucket_should_increase(conn)) {
- conn->receiver_bucket = conn->bandwidth;
- //log_fn(LOG_DEBUG,"Receiver bucket %d now %d.", i,
- // conn->receiver_bucket);
- }
- if (conn->wants_to_read == 1 /* it's marked to turn reading back on now */
- && global_read_bucket > 0 /* and we're allowed to read */
- && global_write_bucket > 0 /* and we're allowed to write (XXXX,
- * not the best place to check this.) */
- && (!connection_speaks_cells(conn) ||
- conn->state != OR_CONN_STATE_OPEN ||
- conn->receiver_bucket > 0)) {
- /* and either a non-cell conn or a cell conn with non-empty bucket */
- LOG_FN_CONN(conn, (LOG_DEBUG,LD_NET,"waking up conn (fd %d)",conn->s));
- conn->wants_to_read = 0;
- connection_start_reading(conn);
- if (conn->wants_to_write == 1) {
- conn->wants_to_write = 0;
- connection_start_writing(conn);
- }
- }
- }
- }
- /** Is the receiver bucket for connection <b>conn</b> low enough that we
- * should add another pile of tokens to it?
- */
- static int
- connection_receiver_bucket_should_increase(connection_t *conn)
- {
- tor_assert(conn);
- if (!connection_speaks_cells(conn))
- return 0; /* edge connections don't use receiver_buckets */
- if (conn->state != OR_CONN_STATE_OPEN)
- return 0; /* only open connections play the rate limiting game */
- if (conn->receiver_bucket >= conn->bandwidth)
- return 0;
- return 1;
- }
- /** Read bytes from conn-\>s and process them.
- *
- * This function gets called from conn_read() in main.c, either
- * when poll() has declared that conn wants to read, or (for OR conns)
- * when there are pending TLS bytes.
- *
- * It calls connection_read_to_buf() to bring in any new bytes,
- * and then calls connection_process_inbuf() to process them.
- *
- * Mark the connection and return -1 if you want to close it, else
- * return 0.
- */
- int
- connection_handle_read(connection_t *conn)
- {
- int max_to_read=-1, try_to_read;
- if (conn->marked_for_close)
- return 0; /* do nothing */
- conn->timestamp_lastread = time(NULL);
- switch (conn->type) {
- case CONN_TYPE_OR_LISTENER:
- return connection_handle_listener_read(conn, CONN_TYPE_OR);
- case CONN_TYPE_AP_LISTENER:
- return connection_handle_listener_read(conn, CONN_TYPE_AP);
- case CONN_TYPE_DIR_LISTENER:
- return connection_handle_listener_read(conn, CONN_TYPE_DIR);
- case CONN_TYPE_CONTROL_LISTENER:
- return connection_handle_listener_read(conn, CONN_TYPE_CONTROL);
- }
- loop_again:
- try_to_read = max_to_read;
- tor_assert(!conn->marked_for_close);
- if (connection_read_to_buf(conn, &max_to_read) < 0) {
- /* There's a read error; kill the connection.*/
- connection_close_immediate(conn); /* Don't flush; connection is dead. */
- if (CONN_IS_EDGE(conn)) {
- connection_edge_end_errno(conn, conn->cpath_layer);
- if (conn->socks_request) /* broken, so don't send a socks reply back */
- conn->socks_request->has_finished = 1;
- }
- connection_mark_for_close(conn);
- return -1;
- }
- if (CONN_IS_EDGE(conn) &&
- try_to_read != max_to_read) {
- /* instruct it not to try to package partial cells. */
- if (connection_process_inbuf(conn, 0) < 0) {
- return -1;
- }
- if (!conn->marked_for_close &&
- connection_is_reading(conn) &&
- !conn->inbuf_reached_eof &&
- max_to_read > 0)
- goto loop_again; /* try reading again, in case more is here now */
- }
- /* one last try, packaging partial cells and all. */
- if (!conn->marked_for_close &&
- connection_process_inbuf(conn, 1) < 0) {
- return -1;
- }
- if (!conn->marked_for_close &&
- conn->inbuf_reached_eof &&
- connection_reached_eof(conn) < 0) {
- return -1;
- }
- return 0;
- }
- /** Pull in new bytes from conn-\>s onto conn-\>inbuf, either
- * directly or via TLS. Reduce the token buckets by the number of
- * bytes read.
- *
- * If *max_to_read is -1, then decide it ourselves, else go with the
- * value passed to us. When returning, if it's changed, subtract the
- * number of bytes we read from *max_to_read.
- *
- * Return -1 if we want to break conn, else return 0.
- */
- static int
- connection_read_to_buf(connection_t *conn, int *max_to_read)
- {
- int result, at_most = *max_to_read;
- size_t bytes_in_buf, more_to_read;
- if (at_most == -1) { /* we need to initialize it */
- /* how many bytes are we allowed to read? */
- at_most = connection_bucket_read_limit(conn);
- }
- bytes_in_buf = buf_capacity(conn->inbuf) - buf_datalen(conn->inbuf);
- again:
- if ((size_t)at_most > bytes_in_buf && bytes_in_buf >= 1024) {
- more_to_read = at_most - bytes_in_buf;
- at_most = bytes_in_buf;
- } else {
- more_to_read = 0;
- }
- if (connection_speaks_cells(conn) &&
- conn->state > OR_CONN_STATE_PROXY_READING) {
- int pending;
- if (conn->state == OR_CONN_STATE_HANDSHAKING) {
- /* continue handshaking even if global token bucket is empty */
- return connection_tls_continue_handshake(conn);
- }
- debug(LD_NET,"%d: starting, inbuf_datalen %d (%d pending in tls object)."
- " at_most %d.",
- conn->s,(int)buf_datalen(conn->inbuf),
- tor_tls_get_pending_bytes(conn->tls), at_most);
- /* else open, or closing */
- result = read_to_buf_tls(conn->tls, at_most, conn->inbuf);
- switch (result) {
- case TOR_TLS_CLOSE:
- info(LD_NET,"TLS connection closed on read. Closing. "
- "(Nickname %s, address %s",
- conn->nickname ? conn->nickname : "not set", conn->address);
- return -1;
- case TOR_TLS_ERROR:
- info(LD_NET,"tls error. breaking (nickname %s, address %s).",
- conn->nickname ? conn->nickname : "not set", conn->address);
- return -1;
- case TOR_TLS_WANTWRITE:
- connection_start_writing(conn);
- return 0;
- case TOR_TLS_WANTREAD: /* we're already reading */
- case TOR_TLS_DONE: /* no data read, so nothing to process */
- result = 0;
- break; /* so we call bucket_decrement below */
- default:
- break;
- }
- pending = tor_tls_get_pending_bytes(conn->tls);
- if (pending) {
- /* XXXX If we have any pending bytes, read them now. This *can*
- * take us over our read allotment, but really we shouldn't be
- * believing that SSL bytes are the same as TCP bytes anyway. */
- int r2 = read_to_buf_tls(conn->tls, pending, conn->inbuf);
- if (r2<0) {
- warn(LD_BUG, "Bug: apparently, reading pending bytes can fail.");
- return -1;
- } else {
- result += r2;
- }
- }
- } else {
- CONN_LOG_PROTECT(conn,
- result = read_to_buf(conn->s, at_most, conn->inbuf,
- &conn->inbuf_reached_eof));
- // log_fn(LOG_DEBUG,"read_to_buf returned %d.",read_result);
- if (result < 0)
- return -1;
- }
- if (result > 0) { /* change *max_to_read */
- *max_to_read = at_most - result;
- }
- if (result > 0 && !is_local_IP(conn->addr)) { /* remember it */
- rep_hist_note_bytes_read(result, time(NULL));
- connection_read_bucket_decrement(conn, result);
- }
- if (more_to_read && result == at_most) {
- bytes_in_buf = buf_capacity(conn->inbuf) - buf_datalen(conn->inbuf);
- tor_assert(bytes_in_buf < 1024);
- at_most = more_to_read;
- goto again;
- }
- /* Call even if result is 0, since the global read bucket may
- * have reached 0 on a different conn, and this guy needs to
- * know to stop reading. */
- connection_consider_empty_buckets(conn);
- return 0;
- }
- /** A pass-through to fetch_from_buf. */
- int
- connection_fetch_from_buf(char *string, size_t len, connection_t *conn)
- {
- return fetch_from_buf(string, len, conn->inbuf);
- }
- /** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
- * from its outbuf. */
- int
- connection_wants_to_flush(connection_t *conn)
- {
- return conn->outbuf_flushlen;
- }
- /** Are there too many bytes on edge connection <b>conn</b>'s outbuf to
- * send back a relay-level sendme yet? Return 1 if so, 0 if not. Used by
- * connection_edge_consider_sending_sendme().
- */
- int
- connection_outbuf_too_full(connection_t *conn)
- {
- return (conn->outbuf_flushlen > 10*CELL_PAYLOAD_SIZE);
- }
- /** Try to flush more bytes onto conn-\>s.
- *
- * This function gets called either from conn_write() in main.c
- * when poll() has declared that conn wants to write, or below
- * from connection_write_to_buf() when an entire TLS record is ready.
- *
- * Update conn-\>timestamp_lastwritten to now, and call flush_buf
- * or flush_buf_tls appropriately. If it succeeds and there no more
- * more bytes on conn->outbuf, then call connection_finished_flushing
- * on it too.
- *
- * Mark the connection and return -1 if you want to close it, else
- * return 0.
- */
- int
- connection_handle_write(connection_t *conn)
- {
- int e;
- socklen_t len=sizeof(e);
- int result;
- int max_to_write;
- time_t now = time(NULL);
- tor_assert(!connection_is_listener(conn));
- if (conn->marked_for_close)
- return 0; /* do nothing */
- conn->timestamp_lastwritten = now;
- /* Sometimes, "writable" means "connected". */
- if (connection_state_is_connecting(conn)) {
- if (getsockopt(conn->s, SOL_SOCKET, SO_ERROR, (void*)&e, &len) < 0) {
- warn(LD_BUG,"getsockopt() syscall failed?! Please report to tor-ops.");
- if (CONN_IS_EDGE(conn))
- connection_edge_end_errno(conn, conn->cpath_layer);
- connection_mark_for_close(conn);
- return -1;
- }
- if (e) {
- /* some sort of error, but maybe just inprogress still */
- if (!ERRNO_IS_CONN_EINPROGRESS(e)) {
- info(LD_NET,"in-progress connect failed. Removing.");
- if (CONN_IS_EDGE(conn))
- connection_edge_end_errno(conn, conn->cpath_layer);
- connection_close_immediate(conn);
- connection_mark_for_close(conn);
- /* it's safe to pass OPs to router_mark_as_down(), since it just
- * ignores unrecognized routers
- */
- if (conn->type == CONN_TYPE_OR && !get_options()->HttpsProxy)
- router_mark_as_down(conn->identity_digest);
- return -1;
- } else {
- return 0; /* no change, see if next time is better */
- }
- }
- /* The connection is successful. */
- if (connection_finished_connecting(conn)<0)
- return -1;
- }
- max_to_write = connection_bucket_write_limit(conn);
- if (connection_speaks_cells(conn) &&
- conn->state > OR_CONN_STATE_PROXY_READING) {
- if (conn->state == OR_CONN_STATE_HANDSHAKING) {
- connection_stop_writing(conn);
- if (connection_tls_continue_handshake(conn) < 0) {
- /* Don't flush; connection is dead. */
- connection_close_immediate(conn);
- connection_mark_for_close(conn);
- return -1;
- }
- return 0;
- }
- /* else open, or closing */
- result = flush_buf_tls(conn->tls, conn->outbuf,
- max_to_write, &conn->outbuf_flushlen);
- switch (result) {
- case TOR_TLS_ERROR:
- case TOR_TLS_CLOSE:
- info(LD_NET,result==TOR_TLS_ERROR?
- "tls error. breaking.":"TLS connection closed on flush");
- /* Don't flush; connection is dead. */
- connection_close_immediate(conn);
- connection_mark_for_close(conn);
- return -1;
- case TOR_TLS_WANTWRITE:
- debug(LD_NET,"wanted write.");
- /* we're already writing */
- return 0;
- case TOR_TLS_WANTREAD:
- /* Make sure to avoid a loop if the receive buckets are empty. */
- debug(LD_NET,"wanted read.");
- if (!connection_is_reading(conn)) {
- connection_stop_writing(conn);
- conn->wants_to_write = 1;
- /* we'll start reading again when the next second arrives,
- * and then also start writing again.
- */
- }
- /* else no problem, we're already reading */
- return 0;
- /* case TOR_TLS_DONE:
- * for TOR_TLS_DONE, fall through to check if the flushlen
- * is empty, so we can stop writing.
- */
- }
- } else {
- CONN_LOG_PROTECT(conn,
- result = flush_buf(conn->s, conn->outbuf,
- max_to_write, &conn->outbuf_flushlen));
- if (result < 0) {
- if (CONN_IS_EDGE(conn))
- connection_edge_end_errno(conn, conn->cpath_layer);
- connection_close_immediate(conn); /* Don't flush; connection is dead. */
- connection_mark_for_close(conn);
- return -1;
- }
- }
- if (result > 0 && !is_local_IP(conn->addr)) { /* remember it */
- rep_hist_note_bytes_written(result, now);
- global_write_bucket -= result;
- }
- if (!connection_wants_to_flush(conn)) { /* it's done flushing */
- if (connection_finished_flushing(conn) < 0) {
- /* already marked */
- return -1;
- }
- }
- return 0;
- }
- /* A controller event has just happened with such urgency that we
- * need to write it onto controller <b>conn</b> immediately. */
- void
- _connection_controller_force_write(connection_t *conn)
- {
- /* XXX This is hideous code duplication, but raising it seems a little
- * tricky for now. Think more about this one. We only call it for
- * EVENT_ERR_MSG, so messing with buckets a little isn't such a big problem.
- */
- int result;
- tor_assert(conn);
- tor_assert(!conn->tls);
- tor_assert(conn->type == CONN_TYPE_CONTROL);
- if (conn->marked_for_close || conn->s < 0)
- return;
- CONN_LOG_PROTECT(conn,
- result = flush_buf(conn->s, conn->outbuf,
- conn->outbuf_flushlen, &conn->outbuf_flushlen));
- if (result < 0) {
- connection_close_immediate(conn); /* Don't flush; connection is dead. */
- connection_mark_for_close(conn);
- return;
- }
- if (result > 0 && !is_local_IP(conn->addr)) { /* remember it */
- rep_hist_note_bytes_written(result, time(NULL));
- global_write_bucket -= result;
- }
- if (!connection_wants_to_flush(conn)) { /* it's done flushing */
- if (connection_finished_flushing(conn) < 0) {
- /* already marked */
- return;
- }
- }
- }
- /** Append <b>len</b> bytes of <b>string</b> onto <b>conn</b>'s
- * outbuf, and ask it to start writing.
- */
- void
- connection_write_to_buf(const char *string, size_t len, connection_t *conn)
- {
- int r;
- if (!len)
- return;
- /* if it's marked for close, only allow write if we mean to flush it */
- if (conn->marked_for_close && !conn->hold_open_until_flushed)
- return;
- CONN_LOG_PROTECT(conn, r = write_to_buf(string, len, conn->outbuf));
- if (r < 0) {
- if (CONN_IS_EDGE(conn)) {
- /* if it failed, it means we have our package/delivery windows set
- wrong compared to our max outbuf size. close the whole circuit. */
- warn(LD_NET,"write_to_buf failed. Closing circuit (fd %d).", conn->s);
- circuit_mark_for_close(circuit_get_by_edge_conn(conn));
- } else {
- warn(LD_NET,"write_to_buf failed. Closing connection (fd %d).", conn->s);
- connection_mark_for_close(conn);
- }
- return;
- }
- connection_start_writing(conn);
- conn->outbuf_flushlen += len;
- }
- /** Return the conn to addr/port that has the most recent
- * timestamp_created, or NULL if no such conn exists. */
- connection_t *
- connection_or_exact_get_by_addr_port(uint32_t addr, uint16_t port)
- {
- int i, n;
- connection_t *conn, *best=NULL;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == CONN_TYPE_OR &&
- conn->addr == addr &&
- conn->port == port &&
- !conn->marked_for_close &&
- (!best || best->timestamp_created < conn->timestamp_created))
- best = conn;
- }
- return best;
- }
- /** Return a connection with given type, address, port, and purpose;
- * or NULL if no such connection exists. */
- connection_t *
- connection_get_by_type_addr_port_purpose(int type,
- uint32_t addr, uint16_t port,
- int purpose)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type &&
- conn->addr == addr &&
- conn->port == port &&
- conn->purpose == purpose &&
- !conn->marked_for_close)
- return conn;
- }
- return NULL;
- }
- /** Return the connection with id <b>id</b> if it is not already marked for
- * close.
- */
- connection_t *
- connection_get_by_global_id(uint32_t id)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->global_identifier == id) {
- if (!conn->marked_for_close)
- return conn;
- else
- return NULL;
- }
- }
- return NULL;
- }
- /** Return a connection of type <b>type</b> that is not marked for close.
- */
- connection_t *
- connection_get_by_type(int type)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type && !conn->marked_for_close)
- return conn;
- }
- return NULL;
- }
- /** Return a connection of type <b>type</b> that is in state <b>state</b>,
- * and that is not marked for close.
- */
- connection_t *
- connection_get_by_type_state(int type, int state)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type && conn->state == state && !conn->marked_for_close)
- return conn;
- }
- return NULL;
- }
- /** Return the connection of type <b>type</b> that is in state
- * <b>state</b>, that was written to least recently, and that is not
- * marked for close.
- */
- connection_t *
- connection_get_by_type_state_lastwritten(int type, int state)
- {
- int i, n;
- connection_t *conn, *best=NULL;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type && conn->state == state && !conn->marked_for_close)
- if (!best || conn->timestamp_lastwritten < best->timestamp_lastwritten)
- best = conn;
- }
- return best;
- }
- /** Return a connection of type <b>type</b> that has rendquery equal
- * to <b>rendquery</b>, and that is not marked for close. If state
- * is non-zero, conn must be of that state too.
- */
- connection_t *
- connection_get_by_type_state_rendquery(int type, int state,
- const char *rendquery)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type &&
- !conn->marked_for_close &&
- (!state || state == conn->state) &&
- !rend_cmp_service_ids(rendquery, conn->rend_query))
- return conn;
- }
- return NULL;
- }
- /** Return an open, non-marked connection of a given type and purpose, or NULL
- * if no such connection exists. */
- connection_t *
- connection_get_by_type_purpose(int type, int purpose)
- {
- int i, n;
- connection_t *conn;
- connection_t **carray;
- get_connection_array(&carray,&n);
- for (i=0;i<n;i++) {
- conn = carray[i];
- if (conn->type == type &&
- !conn->marked_for_close &&
- (purpose == conn->purpose))
- return conn;
- }
- return NULL;
- }
- /** Return 1 if <b>conn</b> is a listener conn, else return 0. */
- int
- connection_is_listener(connection_t *conn)
- {
- if (conn->type == CONN_TYPE_OR_LISTENER ||
- conn->type == CONN_TYPE_AP_LISTENER ||
- conn->type == CONN_TYPE_DIR_LISTENER ||
- conn->type == CONN_TYPE_CONTROL_LISTENER)
- return 1;
- return 0;
- }
- /** Return 1 if <b>conn</b> is in state "open" and is not marked
- * for close, else return 0.
- */
- int
- connection_state_is_open(connection_t *conn)
- {
- tor_assert(conn);
- if (conn->marked_for_close)
- return 0;
- if ((conn->type == CONN_TYPE_OR && conn->state == OR_CONN_STATE_OPEN) ||
- (conn->type == CONN_TYPE_AP && conn->state == AP_CONN_STATE_OPEN) ||
- (conn->type == CONN_TYPE_EXIT && conn->state == EXIT_CONN_STATE_OPEN) ||
- (conn->type == CONN_TYPE_CONTROL &&
- (conn->state == CONTROL_CONN_STATE_OPEN_V0 ||
- conn->state == CONTROL_CONN_STATE_OPEN_V1)))
- return 1;
- return 0;
- }
- /** Return 1 if conn is in 'connecting' state, else return 0. */
- int
- connection_state_is_connecting(connection_t *conn)
- {
- tor_assert(conn);
- if (conn->marked_for_close)
- return 0;
- switch (conn->type)
- {
- case CONN_TYPE_OR:
- return conn->state == OR_CONN_STATE_CONNECTING;
- case CONN_TYPE_EXIT:
- return conn->state == EXIT_CONN_STATE_CONNECTING;
- case CONN_TYPE_DIR:
- return conn->state == DIR_CONN_STATE_CONNECTING;
- }
- return 0;
- }
- /** Write a destroy cell with circ ID <b>circ_id</b> onto OR connection
- * <b>conn</b>.
- *
- * Return 0.
- */
- /*XXXX Why isn't this in connection_or.c?*/
- int
- connection_send_destroy(uint16_t circ_id, connection_t *conn)
- {
- cell_t cell;
- tor_assert(conn);
- tor_assert(connection_speaks_cells(conn));
- memset(&cell, 0, sizeof(cell_t));
- cell.circ_id = circ_id;
- cell.command = CELL_DESTROY;
- debug(LD_OR,"Sending destroy (circID %d).", circ_id);
- connection_or_write_cell_to_buf(&cell, conn);
- return 0;
- }
- /** Alloocates a base64'ed authenticator for use in http or https
- * auth, based on the input string <b>authenticator</b>. Returns it
- * if success, else returns NULL. */
- char *
- alloc_http_authenticator(const char *authenticator)
- {
- /* an authenticator in Basic authentication
- * is just the string "username:password" */
- const int authenticator_length = strlen(authenticator);
- /* The base64_encode function needs a minimum buffer length
- * of 66 bytes. */
- const int base64_authenticator_length = (authenticator_length/48+1)*66;
- char *base64_authenticator = tor_malloc(base64_authenticator_length);
- if (base64_encode(base64_authenticator, base64_authenticator_length,
- authenticator, authenticator_length) < 0) {
- tor_free(base64_authenticator); /* free and set to null */
- } else {
- /* remove extra \n at end of encoding */
- base64_authenticator[strlen(base64_authenticator) - 1] = 0;
- }
- return base64_authenticator;
- }
- /** DOCDOC
- * XXXX ipv6 NM
- */
- static void
- client_check_address_changed(int sock)
- {
- uint32_t iface_ip, ip_out;
- struct sockaddr_in out_addr;
- socklen_t out_addr_len = sizeof(out_addr);
- uint32_t *ip;
- if (!last_interface_ip)
- get_interface_address(&last_interface_ip);
- if (!outgoing_addrs)
- outgoing_addrs = smartlist_create();
- if (getsockname(sock, (struct sockaddr*)&out_addr, &out_addr_len)<0) {
- int e = tor_socket_errno(sock);
- warn(LD_NET, "getsockname() failed: %s", tor_socket_strerror(e));
- return;
- }
- /* Okay. If we've used this address previously, we're okay. */
- ip_out = ntohl(out_addr.sin_addr.s_addr);
- SMARTLIST_FOREACH(outgoing_addrs, uint32_t*, ip,
- if (*ip == ip_out) return;
- );
- /* Uh-oh. We haven't connected from this address before. Has the interface
- * address changed? */
- if (get_interface_address(&iface_ip)<0)
- return;
- ip = tor_malloc(sizeof(uint32_t));
- *ip = ip_out;
- if (iface_ip == last_interface_ip) {
- /* Nope, it hasn't changed. Add this address to the list. */
- smartlist_add(outgoing_addrs, ip);
- } else {
- /* The interface changed. We're a client, so we need to regenerate our
- * keys. First, reset the state. */
- log(LOG_NOTICE, LD_NET, "Our IP has changed. Rotating keys...");
- last_interface_ip = iface_ip;
- SMARTLIST_FOREACH(outgoing_addrs, void*, ip, tor_free(ip));
- smartlist_clear(outgoing_addrs);
- smartlist_add(outgoing_addrs, ip);
- /* Okay, now change our keys. */
- init_keys(); /* XXXX NM return value-- safe to ignore? */
- }
- }
- /** Process new bytes that have arrived on conn-\>inbuf.
- *
- * This function just passes conn to the connection-specific
- * connection_*_process_inbuf() function. It also passes in
- * package_partial if wanted.
- */
- static int
- connection_process_inbuf(connection_t *conn, int package_partial)
- {
- tor_assert(conn);
- switch (conn->type) {
- case CONN_TYPE_OR:
- return connection_or_process_inbuf(conn);
- case CONN_TYPE_EXIT:
- case CONN_TYPE_AP:
- return connection_edge_process_inbuf(conn, package_partial);
- case CONN_TYPE_DIR:
- return connection_dir_process_inbuf(conn);
- case CONN_TYPE_DNSWORKER:
- return connection_dns_process_inbuf(conn);
- case CONN_TYPE_CPUWORKER:
- return connection_cpu_process_inbuf(conn);
- case CONN_TYPE_CONTROL:
- return connection_control_process_inbuf(conn);
- default:
- err(LD_BUG,"Bug: got unexpected conn type %d.", conn->type);
- tor_fragile_assert();
- return -1;
- }
- }
- /** We just finished flushing bytes from conn-\>outbuf, and there
- * are no more bytes remaining.
- *
- * This function just passes conn to the connection-specific
- * connection_*_finished_flushing() function.
- */
- static int
- connection_finished_flushing(connection_t *conn)
- {
- tor_assert(conn);
- // log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
- switch (conn->type) {
- case CONN_TYPE_OR:
- return connection_or_finished_flushing(conn);
- case CONN_TYPE_AP:
- case CONN_TYPE_EXIT:
- return connection_edge_finished_flushing(conn);
- case CONN_TYPE_DIR:
- return connection_dir_finished_flushing(conn);
- case CONN_TYPE_DNSWORKER:
- return connection_dns_finished_flushing(conn);
- case CONN_TYPE_CPUWORKER:
- return connection_cpu_finished_flushing(conn);
- case CONN_TYPE_CONTROL:
- return connection_control_finished_flushing(conn);
- default:
- err(LD_BUG,"Bug: got unexpected conn type %d.", conn->type);
- tor_fragile_assert();
- return -1;
- }
- }
- /** Called when our attempt to connect() to another server has just
- * succeeded.
- *
- * This function just passes conn to the connection-specific
- * connection_*_finished_connecting() function.
- */
- static int
- connection_finished_connecting(connection_t *conn)
- {
- tor_assert(conn);
- switch (conn->type)
- {
- case CONN_TYPE_OR:
- return connection_or_finished_connecting(conn);
- case CONN_TYPE_EXIT:
- return connection_edge_finished_connecting(conn);
- case CONN_TYPE_DIR:
- return connection_dir_finished_connecting(conn);
- default:
- err(LD_BUG,"Bug: got unexpected conn type %d.", conn->type);
- tor_fragile_assert();
- return -1;
- }
- }
- /** Callback: invoked when a connection reaches an EOF event. */
- static int
- connection_reached_eof(connection_t *conn)
- {
- switch (conn->type) {
- case CONN_TYPE_OR:
- return connection_or_reached_eof(conn);
- case CONN_TYPE_AP:
- case CONN_TYPE_EXIT:
- return connection_edge_reached_eof(conn);
- case CONN_TYPE_DIR:
- return connection_dir_reached_eof(conn);
- case CONN_TYPE_DNSWORKER:
- return connection_dns_reached_eof(conn);
- case CONN_TYPE_CPUWORKER:
- return connection_cpu_reached_eof(conn);
- case CONN_TYPE_CONTROL:
- return connection_control_reached_eof(conn);
- default:
- err(LD_BUG,"Bug: got unexpected conn type %d.", conn->type);
- tor_fragile_assert();
- return -1;
- }
- }
- /** Verify that connection <b>conn</b> has all of its invariants
- * correct. Trigger an assert if anything is invalid.
- */
- void
- assert_connection_ok(connection_t *conn, time_t now)
- {
- tor_assert(conn);
- tor_assert(conn->magic == CONNECTION_MAGIC);
- tor_assert(conn->type >= _CONN_TYPE_MIN);
- tor_assert(conn->type <= _CONN_TYPE_MAX);
- if (conn->outbuf_flushlen > 0) {
- tor_assert(connection_is_writing(conn) || conn->wants_to_write);
- }
- if (conn->hold_open_until_flushed)
- tor_assert(conn->marked_for_close);
- /* XXX check: wants_to_read, wants_to_write, s, poll_index,
- * marked_for_close. */
- /* buffers */
- if (!connection_is_listener(conn)) {
- assert_buf_ok(conn->inbuf);
- assert_buf_ok(conn->outbuf);
- }
- /* XXX Fix this; no longer so.*/
- #if 0
- if (conn->type != CONN_TYPE_OR && conn->type != CONN_TYPE_DIR)
- tor_assert(!conn->pkey);
- /* pkey is set if we're a dir client, or if we're an OR in state OPEN
- * connected to another OR.
- */
- #endif
- if (conn->type != CONN_TYPE_OR) {
- tor_assert(!conn->tls);
- } else {
- if (conn->state == OR_CONN_STATE_OPEN) {
- /* tor_assert(conn->bandwidth > 0); */
- /* the above isn't necessarily true: if we just did a TLS
- * handshake but we didn't recognize the other peer, or it
- * gave a bad cert/etc, then we won't have assigned bandwidth,
- * yet it will be open. -RD
- */
- // tor_assert(conn->receiver_bucket >= 0);
- }
- // tor_assert(conn->addr && conn->port);
- tor_assert(conn->address);
- if (conn->state > OR_CONN_STATE_PROXY_READING)
- tor_assert(conn->tls);
- }
- if (! CONN_IS_EDGE(conn)) {
- tor_assert(!conn->stream_id);
- tor_assert(!conn->next_stream);
- tor_assert(!conn->cpath_layer);
- tor_assert(!conn->package_window);
- tor_assert(!conn->deliver_window);
- #if 0
- tor_assert(!conn->done_sending);
- tor_assert(!conn->done_receiving);
- #endif
- } else {
- /* XXX unchecked: package window, deliver window. */
- }
- if (conn->type == CONN_TYPE_AP) {
- tor_assert(conn->socks_request);
- if (conn->state == AP_CONN_STATE_OPEN) {
- tor_assert(conn->socks_request->has_finished);
- if (!conn->marked_for_close) {
- tor_assert(conn->cpath_layer);
- assert_cpath_layer_ok(conn->cpath_layer);
- }
- }
- } else {
- tor_assert(!conn->socks_request);
- }
- if (conn->type == CONN_TYPE_EXIT) {
- tor_assert(conn->purpose == EXIT_PURPOSE_CONNECT ||
- conn->purpose == EXIT_PURPOSE_RESOLVE);
- } else if (conn->type != CONN_TYPE_DIR) {
- tor_assert(!conn->purpose); /* only used for dir types currently */
- }
- if (conn->type != CONN_TYPE_DIR) {
- tor_assert(!conn->requested_resource);
- }
- switch (conn->type)
- {
- case CONN_TYPE_OR_LISTENER:
- case CONN_TYPE_AP_LISTENER:
- case CONN_TYPE_DIR_LISTENER:
- case CONN_TYPE_CONTROL_LISTENER:
- tor_assert(conn->state == LISTENER_STATE_READY);
- break;
- case CONN_TYPE_OR:
- tor_assert(conn->state >= _OR_CONN_STATE_MIN);
- tor_assert(conn->state <= _OR_CONN_STATE_MAX);
- break;
- case CONN_TYPE_EXIT:
- tor_assert(conn->state >= _EXIT_CONN_STATE_MIN);
- tor_assert(conn->state <= _EXIT_CONN_STATE_MAX);
- break;
- case CONN_TYPE_AP:
- tor_assert(conn->state >= _AP_CONN_STATE_MIN);
- tor_assert(conn->state <= _AP_CONN_STATE_MAX);
- tor_assert(conn->socks_request);
- break;
- case CONN_TYPE_DIR:
- tor_assert(conn->state >= _DIR_CONN_STATE_MIN);
- tor_assert(conn->state <= _DIR_CONN_STATE_MAX);
- tor_assert(conn->purpose >= _DIR_PURPOSE_MIN);
- tor_assert(conn->purpose <= _DIR_PURPOSE_MAX);
- break;
- case CONN_TYPE_DNSWORKER:
- tor_assert(conn->state == DNSWORKER_STATE_IDLE ||
- conn->state == DNSWORKER_STATE_BUSY);
- break;
- case CONN_TYPE_CPUWORKER:
- tor_assert(conn->state >= _CPUWORKER_STATE_MIN);
- tor_assert(conn->state <= _CPUWORKER_STATE_MAX);
- break;
- case CONN_TYPE_CONTROL:
- tor_assert(conn->state >= _CONTROL_CONN_STATE_MIN);
- tor_assert(conn->state <= _CONTROL_CONN_STATE_MAX);
- break;
- default:
- tor_assert(0);
- }
- }
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