5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2006 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
25 #define SIZEOF_SOCKADDR(so) ((so).sa.sa_family == AF_INET6 ? \
26 sizeof(so.sin6) : sizeof(so.sin))
28 #define SIZEOF_SOCKADDR(so) (sizeof(so.sin))
33 struct sockaddr_in sin;
35 struct sockaddr_in6 sin6;
39 static SilcBool silc_net_set_sockaddr(SilcSockaddr *addr, const char *ip_addr,
44 memset(addr, 0, sizeof(*addr));
46 /* Check for IPv4 and IPv6 addresses */
48 if (!silc_net_is_ip(ip_addr)) {
49 SILC_LOG_ERROR(("%s is not IP address", ip_addr));
53 if (silc_net_is_ip4(ip_addr)) {
55 len = sizeof(addr->sin.sin_addr);
56 silc_net_addr2bin(ip_addr,
57 (unsigned char *)&addr->sin.sin_addr.s_addr, len);
58 addr->sin.sin_family = AF_INET;
59 addr->sin.sin_port = port ? htons(port) : 0;
63 len = sizeof(addr->sin6.sin6_addr);
64 silc_net_addr2bin(ip_addr,
65 (unsigned char *)&addr->sin6.sin6_addr, len);
66 addr->sin6.sin6_family = AF_INET6;
67 addr->sin6.sin6_port = port ? htons(port) : 0;
69 SILC_LOG_ERROR(("IPv6 support is not compiled in"));
75 addr->sin.sin_family = AF_INET;
76 addr->sin.sin_addr.s_addr = INADDR_ANY;
78 addr->sin.sin_port = htons(port);
84 /* Deliver new stream to upper layer */
86 static void silc_net_accept_stream(SilcSocketStreamStatus status,
87 SilcStream stream, void *context)
89 SilcNetListener listener = context;
91 if (status != SILC_SOCKET_OK)
94 listener->callback(SILC_NET_OK, stream, listener->context);
97 /* Accept incoming connection and notify upper layer */
99 SILC_TASK_CALLBACK(silc_net_accept)
101 SilcNetListener listener = context;
104 SILC_LOG_DEBUG(("Accepting new connection"));
106 sock = silc_net_accept_connection(fd);
110 /* Set socket options */
111 silc_net_set_socket_nonblock(sock);
112 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
114 /* Create socket stream */
115 silc_socket_tcp_stream_create(sock, listener->lookup,
116 listener->require_fqdn, schedule,
117 silc_net_accept_stream, listener);
120 /* Create TCP network listener */
123 silc_net_tcp_create_listener(const char **local_ip_addr,
124 SilcUInt32 local_ip_count, int port,
125 SilcBool lookup, SilcBool require_fqdn,
126 SilcSchedule schedule,
127 SilcNetCallback callback, void *context)
129 SilcNetListener listener = NULL;
132 const char *ipany = "0.0.0.0";
134 SILC_LOG_DEBUG(("Creating TCP listener"));
136 if (port < 1 || !schedule || !callback)
139 listener = silc_calloc(1, sizeof(*listener));
141 callback(SILC_NET_NO_MEMORY, NULL, context);
144 listener->schedule = schedule;
145 listener->callback = callback;
146 listener->context = context;
147 listener->require_fqdn = require_fqdn;
148 listener->lookup = lookup;
150 if (local_ip_count > 0) {
151 listener->socks = silc_calloc(local_ip_count, sizeof(*listener->socks));
152 if (!listener->socks) {
153 callback(SILC_NET_NO_MEMORY, NULL, context);
157 listener->socks = silc_calloc(1, sizeof(*listener->socks));
158 if (!listener->socks) {
159 callback(SILC_NET_NO_MEMORY, NULL, context);
166 /* Bind to local addresses */
167 for (i = 0; i < local_ip_count; i++) {
168 SILC_LOG_DEBUG(("Binding to local address %s",
169 local_ip_addr ? local_ip_addr[i] : ipany));
171 /* Set sockaddr for server */
172 if (!silc_net_set_sockaddr(&server,
173 local_ip_addr ? local_ip_addr[i] : ipany,
177 /* Create the socket */
178 sock = socket(server.sin.sin_family, SOCK_STREAM, 0);
180 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
184 /* Set the socket options */
185 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
187 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
191 /* Bind the listener socket */
192 rval = bind(sock, &server.sa, SIZEOF_SOCKADDR(server));
194 SILC_LOG_DEBUG(("Cannot bind socket: %s", strerror(errno)));
198 /* Specify that we are listenning */
199 rval = listen(sock, 5);
201 SILC_LOG_ERROR(("Cannot set socket listenning: %s", strerror(errno)));
205 /* Set the server socket to non-blocking mode */
206 silc_net_set_socket_nonblock(sock);
208 /* Schedule for incoming connections */
209 silc_schedule_task_add_fd(schedule, sock, silc_net_accept, listener);
211 SILC_LOG_DEBUG(("TCP listener created, fd=%d", sock));
212 listener->socks[i] = sock;
213 listener->socks_count++;
220 callback(SILC_NET_ERROR, NULL, context);
222 silc_net_close_listener(listener);
226 /* Close network listener */
228 void silc_net_close_listener(SilcNetListener listener)
232 SILC_LOG_DEBUG(("Closing network listener"));
234 for (i = 0; i < listener->socks_count; i++) {
235 silc_schedule_task_del_by_fd(listener->schedule, listener->socks[i]);
236 shutdown(listener->socks[i], 2);
237 close(listener->socks[i]);
240 silc_free(listener->socks);
244 /* Create UDP stream */
247 silc_net_udp_connect(const char *local_ip_addr, int local_port,
248 const char *remote_ip_addr, int remote_port,
249 SilcSchedule schedule)
254 const char *ipany = "0.0.0.0";
256 SILC_LOG_DEBUG(("Creating UDP stream"));
261 /* Bind to local addresses */
262 SILC_LOG_DEBUG(("Binding to local address %s",
263 local_ip_addr ? local_ip_addr : ipany));
265 /* Set sockaddr for server */
266 if (!silc_net_set_sockaddr(&server, local_ip_addr ? local_ip_addr : ipany,
270 /* Create the socket */
271 sock = socket(server.sin.sin_family, SOCK_DGRAM, 0);
273 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
277 /* Set the socket options */
278 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
280 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
284 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEPORT, 1);
286 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
289 #endif /* SO_REUSEPORT */
291 /* Bind the listener socket */
292 rval = bind(sock, &server.sa, SIZEOF_SOCKADDR(server));
294 SILC_LOG_DEBUG(("Cannot bind socket: %s", strerror(errno)));
298 /* Set socket to non-blocking mode */
299 silc_net_set_socket_nonblock(sock);
301 /* Set to connected state if remote address is provided. */
302 if (remote_ip_addr && remote_port) {
303 if (!silc_net_set_sockaddr(&server, remote_ip_addr, remote_port))
306 rval = connect(sock, &server.sa, SIZEOF_SOCKADDR(server));
308 SILC_LOG_DEBUG(("Cannot connect UDP stream: %s", strerror(errno)));
313 /* Set send and receive buffer size */
315 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_SNDBUF, 65535);
317 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
320 #endif /* SO_SNDBUF */
322 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_RCVBUF, 65535);
324 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
327 #endif /* SO_RCVBUF */
329 /* Encapsulate into socket stream */
331 silc_socket_udp_stream_create(sock, local_ip_addr ?
332 silc_net_is_ip6(local_ip_addr) : FALSE,
337 SILC_LOG_DEBUG(("UDP stream created, fd=%d", sock));
346 /* Receive UDP packet */
348 int silc_net_udp_receive(SilcStream stream, char *remote_ip_addr,
349 SilcUInt32 remote_ip_addr_size, int *remote_port,
350 unsigned char *ret_data, SilcUInt32 data_size)
352 SilcSocketStream sock = stream;
354 struct sockaddr *from;
357 SILC_LOG_DEBUG(("Reading data from UDP socket %d", sock->sock));
359 if (remote_ip_addr && remote_port) {
361 from = (struct sockaddr *)&s.sin6;
362 flen = sizeof(s.sin6);
364 from = (struct sockaddr *)&s.sin;
365 flen = sizeof(s.sin);
367 len = recvfrom(sock->sock, ret_data, data_size, 0, from, &flen);
369 len = recv(sock->sock, ret_data, data_size, 0);
372 if (errno == EAGAIN || errno == EINTR) {
373 SILC_LOG_DEBUG(("Could not read immediately, will do it later"));
374 silc_schedule_set_listen_fd(sock->schedule, sock->sock,
375 SILC_TASK_READ, FALSE);
378 SILC_LOG_DEBUG(("Cannot read from UDP socket: %d:%s",
379 sock->sock, strerror(errno)));
380 silc_schedule_unset_listen_fd(sock->schedule, sock->sock);
381 sock->sock_error = errno;
385 SILC_LOG_DEBUG(("Read %d bytes", len));
388 silc_schedule_unset_listen_fd(sock->schedule, sock->sock);
390 /* Return remote address */
391 if (remote_ip_addr && remote_port) {
393 *remote_port = ntohs(s.sin6.sin6_port);
394 inet_ntop(AF_INET6, &s.sin6.sin6_addr, remote_ip_addr,
395 remote_ip_addr_size);
397 *remote_port = ntohs(s.sin.sin_port);
398 inet_ntop(AF_INET, &s.sin.sin_addr, remote_ip_addr,
399 remote_ip_addr_size);
406 /* Send UDP packet */
408 void silc_net_udp_send(SilcStream stream,
409 const char *remote_ip_addr, int remote_port,
410 const unsigned char *data, SilcUInt32 data_len)
412 SilcSocketStream sock = stream;
415 SILC_LOG_DEBUG(("Writing data to UDP socket %d", sock->sock));
417 /* Set sockaddr for server */
418 if (!silc_net_set_sockaddr(&remote, remote_ip_addr, remote_port))
422 sendto(sock->sock, data, data_len, 0, &remote.sa, SIZEOF_SOCKADDR(remote));
425 /* Asynchronous TCP/IP connecting */
428 SilcNetStatus status;
429 SilcSocketStreamStatus stream_status;
432 SilcFSMSemaStruct sema;
433 SilcAsyncOperation op;
434 SilcAsyncOperation sop;
439 SilcNetCallback callback;
441 unsigned int port : 24;
442 unsigned int retry : 7;
443 unsigned int aborted : 1;
446 SILC_FSM_STATE(silc_net_connect_st_start);
447 SILC_FSM_STATE(silc_net_connect_st_connected);
448 SILC_FSM_STATE(silc_net_connect_st_stream);
449 SILC_FSM_STATE(silc_net_connect_st_finish);
451 SILC_TASK_CALLBACK(silc_net_connect_wait)
453 SilcNetConnect conn = context;
454 SILC_FSM_SEMA_POST(&conn->sema);
455 silc_schedule_task_del_by_fd(schedule, conn->sock);
458 SILC_FSM_STATE(silc_net_connect_st_start)
460 SilcNetConnect conn = fsm_context;
462 SilcSockaddr desthost;
463 SilcBool prefer_ipv6 = TRUE;
467 silc_fsm_next(fsm, silc_net_connect_st_finish);
468 return SILC_FSM_CONTINUE;
473 if (!silc_net_gethostbyname(conn->remote, prefer_ipv6,
474 conn->ip_addr, sizeof(conn->ip_addr))) {
475 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
476 "host", conn->remote));
478 /** Network unreachable */
479 conn->status = SILC_NET_HOST_UNREACHABLE;
480 silc_fsm_next(fsm, silc_net_connect_st_finish);
481 return SILC_FSM_CONTINUE;
484 /* Set sockaddr for this connection */
485 if (!silc_net_set_sockaddr(&desthost, conn->ip_addr, conn->port)) {
486 /** Sockaddr failed */
487 silc_fsm_next(fsm, silc_net_connect_st_finish);
488 return SILC_FSM_CONTINUE;
491 /* Create the connection socket */
492 sock = socket(desthost.sin.sin_family, SOCK_STREAM, 0);
494 /* If address is IPv6, then fallback to IPv4 and see whether we can do
495 better with that on socket creation. */
496 if (prefer_ipv6 && silc_net_is_ip6(conn->ip_addr)) {
501 /** Cannot create socket */
502 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
503 silc_fsm_next(fsm, silc_net_connect_st_finish);
504 return SILC_FSM_CONTINUE;
507 /* Bind to the local address if provided */
508 if (conn->local_ip) {
511 /* Set sockaddr for local listener, and try to bind it. */
512 if (silc_net_set_sockaddr(&local, conn->local_ip, 0))
513 bind(sock, &local.sa, SIZEOF_SOCKADDR(local));
516 /* Set the socket to non-blocking mode */
517 silc_net_set_socket_nonblock(sock);
519 /* Connect to the host */
520 rval = connect(sock, &desthost.sa, SIZEOF_SOCKADDR(desthost));
522 if (errno != EINPROGRESS) {
523 /* retry using an IPv4 adress, if IPv6 didn't work */
524 if (prefer_ipv6 && silc_net_is_ip6(conn->ip_addr)) {
535 /** Cannot connect to remote host */
536 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
537 silc_fsm_next(fsm, silc_net_connect_st_finish);
538 return SILC_FSM_CONTINUE;
542 /* Set appropriate options */
543 #if defined(TCP_NODELAY)
544 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
546 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
548 SILC_LOG_DEBUG(("Connection operation in progress"));
552 /** Wait for connection */
553 silc_fsm_next(fsm, silc_net_connect_st_connected);
554 silc_fsm_sema_init(&conn->sema, fsm, 0);
555 silc_schedule_task_add_fd(silc_fsm_get_schedule(fsm), sock,
556 silc_net_connect_wait, conn);
557 silc_schedule_set_listen_fd(silc_fsm_get_schedule(fsm), sock,
558 SILC_TASK_WRITE, FALSE);
559 SILC_FSM_SEMA_WAIT(&conn->sema);
560 return SILC_FSM_CONTINUE;
563 static void silc_net_connect_wait_stream(SilcSocketStreamStatus status,
564 SilcStream stream, void *context)
566 SilcNetConnect conn = context;
567 conn->stream_status = status;
568 conn->stream = stream;
569 SILC_FSM_CALL_CONTINUE(&conn->fsm);
572 SILC_FSM_STATE(silc_net_connect_st_connected)
574 SilcNetConnect conn = fsm_context;
575 SilcSchedule schedule = silc_fsm_get_schedule(fsm);
576 int opt = EINVAL, optlen = sizeof(opt), ret;
580 silc_fsm_next(fsm, silc_net_connect_st_finish);
581 return SILC_FSM_CONTINUE;
584 ret = silc_net_get_socket_opt(conn->sock, SOL_SOCKET, SO_ERROR,
587 silc_schedule_task_del_by_fd(schedule, conn->sock);
588 silc_schedule_unset_listen_fd(schedule, conn->sock);
590 if (ret != 0 || opt != 0) {
592 /** Retry connecting */
593 SILC_LOG_DEBUG(("Retry connecting"));
595 silc_net_close_connection(conn->sock);
596 silc_fsm_next(fsm, silc_net_connect_st_start);
597 return SILC_FSM_CONTINUE;
600 #if defined(ECONNREFUSED)
601 if (errno == ECONNREFUSED)
602 conn->status = SILC_NET_CONNECTION_REFUSED;
603 #endif /* ECONNREFUSED */
604 #if defined(ETIMEDOUT)
605 if (errno == ETIMEDOUT)
606 conn->status = SILC_NET_CONNECTION_TIMEOUT;
607 #endif /* ETIMEDOUT */
608 #if defined(ENETUNREACH)
609 if (errno == ENETUNREACH)
610 conn->status = SILC_NET_HOST_UNREACHABLE;
611 #endif /* ENETUNREACH */
613 /** Connecting failed */
614 SILC_LOG_DEBUG(("Connecting failed"));
615 silc_fsm_next(fsm, silc_net_connect_st_finish);
616 return SILC_FSM_CONTINUE;
619 /** Connection created */
620 silc_fsm_next(fsm, silc_net_connect_st_stream);
621 SILC_FSM_CALL((conn->sop = silc_socket_tcp_stream_create(
622 conn->sock, FALSE, FALSE,
624 silc_net_connect_wait_stream, conn)));
627 SILC_FSM_STATE(silc_net_connect_st_stream)
629 SilcNetConnect conn = fsm_context;
633 silc_fsm_next(fsm, silc_net_connect_st_finish);
634 return SILC_FSM_CONTINUE;
637 if (conn->stream_status != SILC_SOCKET_OK) {
638 /** Stream creation failed */
639 if (conn->stream_status == SILC_SOCKET_UNKNOWN_IP)
640 conn->status = SILC_NET_UNKNOWN_IP;
641 else if (conn->stream_status == SILC_SOCKET_UNKNOWN_HOST)
642 conn->status = SILC_NET_UNKNOWN_HOST;
644 conn->status = SILC_NET_ERROR;
645 silc_fsm_next(fsm, silc_net_connect_st_finish);
646 return SILC_FSM_CONTINUE;
649 /* Set stream information */
650 silc_socket_stream_set_info(conn->stream,
651 !silc_net_is_ip(conn->remote) ? conn->remote :
652 conn->ip_addr, conn->ip_addr, conn->port);
654 /** Stream created successfully */
655 SILC_LOG_DEBUG(("Connected successfully"));
656 conn->status = SILC_NET_OK;
657 silc_fsm_next(fsm, silc_net_connect_st_finish);
658 return SILC_FSM_CONTINUE;
661 SILC_FSM_STATE(silc_net_connect_st_finish)
663 SilcNetConnect conn = fsm_context;
665 /* Deliver error or new stream */
666 if (!conn->aborted) {
667 conn->callback(conn->status, conn->stream, conn->context);
669 silc_async_free(conn->op);
671 silc_async_free(conn->sop);
674 return SILC_FSM_FINISH;
677 static void silc_net_connect_abort(SilcAsyncOperation op, void *context)
679 SilcNetConnect conn = context;
680 conn->aborted = TRUE;
682 /* Abort underlaying stream creation too */
684 silc_async_abort(conn->op, NULL, NULL);
687 static void silc_net_connect_destructor(SilcFSM fsm, void *fsm_context,
688 void *destructor_context)
690 SilcNetConnect conn = fsm_context;
691 silc_free(conn->local_ip);
692 silc_free(conn->remote);
696 /* Create asynchronous TCP/IP connection. */
698 SilcAsyncOperation silc_net_tcp_connect(const char *local_ip_addr,
699 const char *remote_ip_addr,
701 SilcSchedule schedule,
702 SilcNetCallback callback,
707 if (!remote_ip_addr || remote_port < 1 || !schedule || !callback)
710 SILC_LOG_DEBUG(("Creating connection to host %s port %d",
711 remote_ip_addr, remote_port));
713 conn = silc_calloc(1, sizeof(*conn));
715 callback(SILC_NET_NO_MEMORY, NULL, context);
719 /* Start async operation */
720 conn->op = silc_async_alloc(silc_net_connect_abort, NULL, conn);
722 callback(SILC_NET_NO_MEMORY, NULL, context);
727 conn->local_ip = strdup(local_ip_addr);
728 conn->remote = strdup(remote_ip_addr);
730 callback(SILC_NET_NO_MEMORY, NULL, context);
733 conn->port = remote_port;
734 conn->callback = callback;
735 conn->context = context;
737 conn->status = SILC_NET_ERROR;
739 silc_fsm_init(&conn->fsm, conn, silc_net_connect_destructor, NULL, schedule);
740 silc_fsm_start(&conn->fsm, silc_net_connect_st_start);
745 /* Closes the connection by closing the socket connection. */
747 void silc_net_close_connection(int sock)
752 /* Set's the socket to non-blocking mode. */
754 int silc_net_set_socket_nonblock(int sock)
756 return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
759 /* Converts the IP number string from numbers-and-dots notation to
762 SilcBool silc_net_addr2bin(const char *addr, void *bin, SilcUInt32 bin_len)
766 if (silc_net_is_ip4(addr)) {
769 ret = inet_aton(addr, &tmp);
773 memcpy(bin, (unsigned char *)&tmp.s_addr, 4);
776 struct addrinfo hints, *ai;
783 memset(&hints, 0, sizeof(hints));
784 hints.ai_family = AF_INET6;
785 if (getaddrinfo(addr, NULL, &hints, &ai))
789 s = (SilcSockaddr *)ai->ai_addr;
790 memcpy(bin, &s->sin6.sin6_addr, sizeof(s->sin6.sin6_addr));
795 #endif /* HAVE_IPV6 */