]> git.meshlink.io Git - meshlink/blob - src/net_socket.c
Update UTCP to correctly handle timeouts sending data.
[meshlink] / src / net_socket.c
1 /*
2     net_socket.c -- Handle various kinds of sockets.
3     Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
4
5     This program is free software; you can redistribute it and/or modify
6     it under the terms of the GNU General Public License as published by
7     the Free Software Foundation; either version 2 of the License, or
8     (at your option) any later version.
9
10     This program is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13     GNU General Public License for more details.
14
15     You should have received a copy of the GNU General Public License along
16     with this program; if not, write to the Free Software Foundation, Inc.,
17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #include "system.h"
21
22 #include "conf.h"
23 #include "connection.h"
24 #include "list.h"
25 #include "logger.h"
26 #include "meshlink_internal.h"
27 #include "meta.h"
28 #include "net.h"
29 #include "netutl.h"
30 #include "protocol.h"
31 #include "utils.h"
32 #include "xalloc.h"
33
34 /* Needed on Mac OS/X */
35 #ifndef SOL_TCP
36 #define SOL_TCP IPPROTO_TCP
37 #endif
38
39 #ifndef MSG_NOSIGNAL
40 #define MSG_NOSIGNAL 0
41 #endif
42
43 int addressfamily = AF_UNSPEC;
44 int seconds_till_retry = 5;
45 int max_connection_burst = 100;
46
47 /* Setup sockets */
48
49 static void configure_tcp(connection_t *c) {
50 #ifdef O_NONBLOCK
51         int flags = fcntl(c->socket, F_GETFL);
52
53         if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
54                 logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "fcntl", strerror(errno));
55         }
56
57 #elif defined(WIN32)
58         unsigned long arg = 1;
59
60         if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
61                 logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
62         }
63
64 #endif
65
66 #if defined(SOL_TCP) && defined(TCP_NODELAY)
67         int nodelay = 1;
68         setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&nodelay, sizeof(nodelay));
69 #endif
70
71 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
72         int lowdelay = IPTOS_LOWDELAY;
73         setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&lowdelay, sizeof(lowdelay));
74 #endif
75 }
76
77 static bool bind_to_address(meshlink_handle_t *mesh, connection_t *c) {
78         int s = -1;
79
80         for(int i = 0; i < mesh->listen_sockets && mesh->listen_socket[i].bindto; i++) {
81                 if(mesh->listen_socket[i].sa.sa.sa_family != c->address.sa.sa_family) {
82                         continue;
83                 }
84
85                 if(s >= 0) {
86                         return false;
87                 }
88
89                 s = i;
90         }
91
92         if(s < 0) {
93                 return false;
94         }
95
96         sockaddr_t sa = mesh->listen_socket[s].sa;
97
98         if(sa.sa.sa_family == AF_INET) {
99                 sa.in.sin_port = 0;
100         } else if(sa.sa.sa_family == AF_INET6) {
101                 sa.in6.sin6_port = 0;
102         }
103
104         if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
105                 logger(mesh, MESHLINK_WARNING, "Can't bind outgoing socket: %s", strerror(errno));
106                 return false;
107         }
108
109         return true;
110 }
111
112 int setup_listen_socket(const sockaddr_t *sa) {
113         int nfd;
114         char *addrstr;
115         int option;
116
117         nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
118
119         if(nfd < 0) {
120                 logger(NULL, MESHLINK_ERROR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
121                 return -1;
122         }
123
124 #ifdef FD_CLOEXEC
125         fcntl(nfd, F_SETFD, FD_CLOEXEC);
126 #endif
127
128         /* Optimize TCP settings */
129
130         option = 1;
131         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
132
133 #if defined(IPV6_V6ONLY)
134
135         if(sa->sa.sa_family == AF_INET6) {
136                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
137         }
138
139 #else
140 #warning IPV6_V6ONLY not defined
141 #endif
142
143         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
144                 closesocket(nfd);
145                 addrstr = sockaddr2hostname(sa);
146                 logger(NULL, MESHLINK_ERROR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
147                 free(addrstr);
148                 return -1;
149         }
150
151         if(listen(nfd, 3)) {
152                 closesocket(nfd);
153                 logger(NULL, MESHLINK_ERROR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
154                 return -1;
155         }
156
157         return nfd;
158 }
159
160 int setup_vpn_in_socket(meshlink_handle_t *mesh, const sockaddr_t *sa) {
161         int nfd;
162         char *addrstr;
163         int option;
164
165         nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
166
167         if(nfd < 0) {
168                 logger(mesh, MESHLINK_ERROR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
169                 return -1;
170         }
171
172 #ifdef FD_CLOEXEC
173         fcntl(nfd, F_SETFD, FD_CLOEXEC);
174 #endif
175
176 #ifdef O_NONBLOCK
177         {
178                 int flags = fcntl(nfd, F_GETFL);
179
180                 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
181                         closesocket(nfd);
182                         logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "fcntl",
183                                strerror(errno));
184                         return -1;
185                 }
186         }
187 #elif defined(WIN32)
188         {
189                 unsigned long arg = 1;
190
191                 if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
192                         closesocket(nfd);
193                         logger(mesh, MESHLINK_ERROR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
194                         return -1;
195                 }
196         }
197 #endif
198
199         option = 1;
200         setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option));
201         setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option));
202
203 #if defined(IPV6_V6ONLY)
204
205         if(sa->sa.sa_family == AF_INET6) {
206                 setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
207         }
208
209 #endif
210
211 #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
212 #define IP_DONTFRAGMENT IP_DONTFRAG
213 #endif
214
215 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
216
217         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
218                 option = IP_PMTUDISC_DO;
219                 setsockopt(nfd, IPPROTO_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
220         }
221
222 #elif defined(IP_DONTFRAGMENT)
223
224         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
225                 option = 1;
226                 setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
227         }
228
229 #else
230 #warning No way to disable IPv4 fragmentation
231 #endif
232
233 #if defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
234
235         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
236                 option = IPV6_PMTUDISC_DO;
237                 setsockopt(nfd, IPPROTO_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
238         }
239
240 #elif defined(IPV6_DONTFRAG)
241
242         if(mesh->self->options & OPTION_PMTU_DISCOVERY) {
243                 option = 1;
244                 setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
245         }
246
247 #else
248 #warning No way to disable IPv6 fragmentation
249 #endif
250
251         if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
252                 closesocket(nfd);
253                 addrstr = sockaddr2hostname(sa);
254                 logger(mesh, MESHLINK_ERROR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
255                 free(addrstr);
256                 return -1;
257         }
258
259         return nfd;
260 } /* int setup_vpn_in_socket */
261
262 static void retry_outgoing_handler(event_loop_t *loop, void *data) {
263         meshlink_handle_t *mesh = loop->data;
264         outgoing_t *outgoing = data;
265         setup_outgoing_connection(mesh, outgoing);
266 }
267
268 void retry_outgoing(meshlink_handle_t *mesh, outgoing_t *outgoing) {
269         outgoing->timeout += 5;
270
271         if(outgoing->timeout > mesh->maxtimeout) {
272                 outgoing->timeout = mesh->maxtimeout;
273         }
274
275         timeout_add(&mesh->loop, &outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval) {
276                 outgoing->timeout, rand() % 100000
277         });
278
279         logger(mesh, MESHLINK_INFO, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
280 }
281
282 void finish_connecting(meshlink_handle_t *mesh, connection_t *c) {
283         logger(mesh, MESHLINK_INFO, "Connected to %s", c->name);
284
285         c->last_ping_time = mesh->loop.now.tv_sec;
286         c->status.connecting = false;
287
288         send_id(mesh, c);
289 }
290
291 static void handle_meta_write(meshlink_handle_t *mesh, connection_t *c) {
292         if(c->outbuf.len <= c->outbuf.offset) {
293                 return;
294         }
295
296         ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, MSG_NOSIGNAL);
297
298         if(outlen <= 0) {
299                 if(!errno || errno == EPIPE) {
300                         logger(mesh, MESHLINK_INFO, "Connection closed by %s", c->name);
301                 } else if(sockwouldblock(sockerrno)) {
302                         logger(mesh, MESHLINK_DEBUG, "Sending %lu bytes to %s would block", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name);
303                         return;
304                 } else {
305                         logger(mesh, MESHLINK_ERROR, "Could not send %lu bytes of data to %s: %s", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name, strerror(errno));
306                 }
307
308                 terminate_connection(mesh, c, c->status.active);
309                 return;
310         }
311
312         buffer_read(&c->outbuf, outlen);
313
314         if(!c->outbuf.len) {
315                 io_set(&mesh->loop, &c->io, IO_READ);
316         }
317 }
318
319 static void handle_meta_io(event_loop_t *loop, void *data, int flags) {
320         meshlink_handle_t *mesh = loop->data;
321         connection_t *c = data;
322
323         if(c->status.connecting) {
324                 c->status.connecting = false;
325
326                 int result;
327                 socklen_t len = sizeof(result);
328                 getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
329
330                 if(!result) {
331                         finish_connecting(mesh, c);
332                 } else {
333                         logger(mesh, MESHLINK_DEBUG, "Error while connecting to %s: %s", c->name, sockstrerror(result));
334                         terminate_connection(mesh, c, false);
335                         return;
336                 }
337         }
338
339         if(flags & IO_WRITE) {
340                 handle_meta_write(mesh, c);
341         } else {
342                 handle_meta_connection_data(mesh, c);
343         }
344 }
345
346 // Find edges pointing to this node, and use them to build a list of unique, known addresses.
347 static struct addrinfo *get_known_addresses(node_t *n) {
348         struct addrinfo *ai = NULL;
349
350         for splay_each(edge_t, e, n->edge_tree) {
351                 if(!e->reverse) {
352                         continue;
353                 }
354
355                 bool found = false;
356
357                 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
358                         if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
359                                 found = true;
360                                 break;
361                         }
362                 }
363
364                 if(found) {
365                         continue;
366                 }
367
368                 // Create a new struct addrinfo, and put it at the head of the list.
369                 struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(e->reverse->address.sa));
370                 nai->ai_next = ai;
371                 ai = nai;
372
373                 ai->ai_family = e->reverse->address.sa.sa_family;
374                 ai->ai_socktype = SOCK_STREAM;
375                 ai->ai_protocol = IPPROTO_TCP;
376                 ai->ai_addrlen = SALEN(e->reverse->address.sa);
377                 ai->ai_addr = (struct sockaddr *)(nai + 1);
378                 memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
379         }
380
381         return ai;
382 }
383
384 // Build a list of recently seen addresses.
385 static struct addrinfo *get_recent_addresses(node_t *n) {
386         struct addrinfo *ai = NULL;
387         struct addrinfo *aip;
388
389         for(int i = 0; i < 5; i++) {
390                 if(!n->recent[i].sa.sa_family) {
391                         break;
392                 }
393
394                 // Create a new struct addrinfo, and put it at the end of the list.
395                 struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(n->recent[i].sa));
396
397                 if(!ai) {
398                         ai = nai;
399                 } else {
400                         aip->ai_next = nai;
401                 }
402
403                 aip = nai;
404
405                 nai->ai_family = n->recent[i].sa.sa_family;
406                 nai->ai_socktype = SOCK_STREAM;
407                 nai->ai_protocol = IPPROTO_TCP;
408                 nai->ai_addrlen = SALEN(n->recent[i].sa);
409                 nai->ai_addr = (struct sockaddr *)(nai + 1);
410                 memcpy(nai->ai_addr, &n->recent[i], nai->ai_addrlen);
411         }
412
413         return ai;
414 }
415
416 // Free struct addrinfo list from get_known_addresses().
417 static void free_known_addresses(struct addrinfo *ai) {
418         for(struct addrinfo *aip = ai, *next; aip; aip = next) {
419                 next = aip->ai_next;
420                 free(aip);
421         }
422 }
423
424 static struct addrinfo *get_canonical_address(node_t *n) {
425         if(!n->canonical_address) {
426                 return false;
427         }
428
429         char *address = xstrdup(n->canonical_address);
430         char *port = strchr(address, ' ');
431
432         if(!port) {
433                 free(address);
434                 return false;
435         }
436
437         *port++ = 0;
438
439         struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
440         free(address);
441
442         return ai;
443 }
444
445 static bool get_next_outgoing_address(meshlink_handle_t *mesh, outgoing_t *outgoing) {
446         (void)mesh;
447
448         bool start = false;
449
450         if(outgoing->state == OUTGOING_START) {
451                 start = true;
452                 outgoing->state = OUTGOING_CANONICAL;
453         }
454
455         if(outgoing->state == OUTGOING_CANONICAL) {
456                 if(!outgoing->aip) {
457                         outgoing->ai = get_canonical_address(outgoing->node);
458                         outgoing->aip = outgoing->ai;
459                 } else {
460                         outgoing->aip = outgoing->aip->ai_next;
461                 }
462
463                 if(outgoing->aip) {
464                         return true;
465                 }
466
467                 freeaddrinfo(outgoing->ai);
468                 outgoing->ai = NULL;
469                 outgoing->aip = NULL;
470                 outgoing->state = OUTGOING_RECENT;
471         }
472
473         if(outgoing->state == OUTGOING_RECENT) {
474                 if(!outgoing->aip) {
475                         outgoing->ai = get_recent_addresses(outgoing->node);
476                         outgoing->aip = outgoing->ai;
477                 } else {
478                         outgoing->aip = outgoing->aip->ai_next;
479                 }
480
481                 if(outgoing->aip) {
482                         return true;
483                 }
484
485                 free_known_addresses(outgoing->ai);
486                 outgoing->ai = NULL;
487                 outgoing->aip = NULL;
488                 outgoing->state = OUTGOING_KNOWN;
489         }
490
491         if(outgoing->state == OUTGOING_KNOWN) {
492                 if(!outgoing->aip) {
493                         outgoing->ai = get_known_addresses(outgoing->node);
494                         outgoing->aip = outgoing->ai;
495                 } else {
496                         outgoing->aip = outgoing->aip->ai_next;
497                 }
498
499                 if(outgoing->aip) {
500                         return true;
501                 }
502
503                 free_known_addresses(outgoing->ai);
504                 outgoing->ai = NULL;
505                 outgoing->aip = NULL;
506                 outgoing->state = OUTGOING_END;
507         }
508
509         if(start) {
510                 outgoing->state = OUTGOING_NO_KNOWN_ADDRESSES;
511         }
512
513         return false;
514 }
515
516 bool do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
517         struct addrinfo *proxyai = NULL;
518         int result;
519
520 begin:
521
522         if(!get_next_outgoing_address(mesh, outgoing)) {
523                 if(outgoing->state == OUTGOING_NO_KNOWN_ADDRESSES) {
524                         logger(mesh, MESHLINK_ERROR, "No known addresses for %s", outgoing->node->name);
525                 } else {
526                         logger(mesh, MESHLINK_ERROR, "Could not set up a meta connection to %s", outgoing->node->name);
527                         retry_outgoing(mesh, outgoing);
528                 }
529
530                 return false;
531         }
532
533         connection_t *c = new_connection();
534         c->outgoing = outgoing;
535
536         memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
537
538         char *hostname = sockaddr2hostname(&c->address);
539
540         logger(mesh, MESHLINK_INFO, "Trying to connect to %s at %s", outgoing->node->name, hostname);
541
542         if(!mesh->proxytype) {
543                 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
544                 configure_tcp(c);
545         } else {
546                 proxyai = str2addrinfo(mesh->proxyhost, mesh->proxyport, SOCK_STREAM);
547
548                 if(!proxyai) {
549                         free_connection(c);
550                         free(hostname);
551                         goto begin;
552                 }
553
554                 logger(mesh, MESHLINK_INFO, "Using proxy at %s port %s", mesh->proxyhost, mesh->proxyport);
555                 c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
556                 configure_tcp(c);
557         }
558
559         if(c->socket == -1) {
560                 logger(mesh, MESHLINK_ERROR, "Creating socket for %s at %s failed: %s", c->name, hostname, sockstrerror(sockerrno));
561                 free_connection(c);
562                 free(hostname);
563                 goto begin;
564         }
565
566         free(hostname);
567
568 #ifdef FD_CLOEXEC
569         fcntl(c->socket, F_SETFD, FD_CLOEXEC);
570 #endif
571
572 #if defined(IPV6_V6ONLY)
573
574         if(c->address.sa.sa_family == AF_INET6) {
575                 static const int option = 1;
576                 setsockopt(c->socket, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
577         }
578
579 #endif
580
581         bind_to_address(mesh, c);
582
583         /* Connect */
584
585         if(!mesh->proxytype) {
586                 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
587         } else {
588                 result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
589                 freeaddrinfo(proxyai);
590         }
591
592         if(result == -1 && !sockinprogress(sockerrno)) {
593                 logger(mesh, MESHLINK_ERROR, "Could not connect to %s: %s", outgoing->node->name, sockstrerror(sockerrno));
594                 free_connection(c);
595
596                 goto begin;
597         }
598
599         /* Now that there is a working socket, fill in the rest and register this connection. */
600
601         c->status.connecting = true;
602         c->name = xstrdup(outgoing->node->name);
603         c->last_ping_time = mesh->loop.now.tv_sec;
604
605         connection_add(mesh, c);
606
607         io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ | IO_WRITE);
608
609         return true;
610 }
611
612 void setup_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
613         timeout_del(&mesh->loop, &outgoing->ev);
614
615         if(outgoing->node->connection) {
616                 logger(mesh, MESHLINK_INFO, "Already connected to %s", outgoing->node->name);
617
618                 outgoing->node->connection->outgoing = outgoing;
619                 return;
620         }
621
622
623         if(outgoing->ai) {
624                 if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
625                         free_known_addresses(outgoing->ai);
626                 } else {
627                         freeaddrinfo(outgoing->ai);
628                 }
629         }
630
631         outgoing->state = OUTGOING_START;
632
633         if(outgoing->node->status.blacklisted) {
634                 return;
635         }
636
637         if(mesh->connection_try_cb) {
638                 mesh->connection_try_cb(mesh, (meshlink_node_t *)outgoing->node);
639         }
640
641         do_outgoing_connection(mesh, outgoing);
642 }
643
644 /// Delayed close of a filedescriptor.
645 static void tarpit(int fd) {
646         static int pits[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
647         static int next_pit = 0;
648
649         if(pits[next_pit] != -1) {
650                 closesocket(pits[next_pit]);
651         }
652
653         pits[next_pit++] = fd;
654
655         if(next_pit >= (int)(sizeof pits / sizeof pits[0])) {
656                 next_pit = 0;
657         }
658 }
659
660 /*
661   accept a new tcp connect and create a
662   new connection
663 */
664 void handle_new_meta_connection(event_loop_t *loop, void *data, int flags) {
665         (void)flags;
666         meshlink_handle_t *mesh = loop->data;
667         listen_socket_t *l = data;
668         connection_t *c;
669         sockaddr_t sa;
670         int fd;
671         socklen_t len = sizeof(sa);
672
673         memset(&sa, 0, sizeof(sa));
674
675         fd = accept(l->tcp.fd, &sa.sa, &len);
676
677         if(fd < 0) {
678                 if(errno == EINVAL) { // TODO: check if Windows agrees
679                         event_loop_stop(loop);
680                         return;
681                 }
682
683                 logger(mesh, MESHLINK_ERROR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
684                 return;
685         }
686
687         sockaddrunmap(&sa);
688
689         /* Rate limit incoming connections to max_connection_burst/second. */
690
691         static int connection_burst;
692         static int connection_burst_time;
693
694         if(mesh->loop.now.tv_sec != connection_burst_time) {
695                 connection_burst_time = mesh->loop.now.tv_sec;
696                 connection_burst = 0;
697         }
698
699         if(connection_burst >= max_connection_burst) {
700                 tarpit(fd);
701                 return;
702         }
703
704         connection_burst++;
705
706         // Accept the new connection
707
708         c = new_connection();
709         c->name = xstrdup("<unknown>");
710
711         c->address = sa;
712         c->socket = fd;
713         c->last_ping_time = mesh->loop.now.tv_sec;
714
715         char *hostname = sockaddr2hostname(&sa);
716         logger(mesh, MESHLINK_INFO, "Connection from %s", hostname);
717         free(hostname);
718
719         io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ);
720
721         configure_tcp(c);
722
723         connection_add(mesh, c);
724
725         c->allow_request = ID;
726         send_id(mesh, c);
727 }
728
729 static void free_outgoing(outgoing_t *outgoing) {
730         meshlink_handle_t *mesh = outgoing->node->mesh;
731
732         timeout_del(&mesh->loop, &outgoing->ev);
733
734         if(outgoing->ai) {
735                 if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
736                         free_known_addresses(outgoing->ai);
737                 } else {
738                         freeaddrinfo(outgoing->ai);
739                 }
740         }
741
742         free(outgoing);
743 }
744
745 void init_outgoings(meshlink_handle_t *mesh) {
746         mesh->outgoings = list_alloc((list_action_t)free_outgoing);
747 }
748
749 void exit_outgoings(meshlink_handle_t *mesh) {
750         if(mesh->outgoings) {
751                 list_delete_list(mesh->outgoings);
752                 mesh->outgoings = NULL;
753         }
754 }