OpenVPN
socket.c
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1 /*
2  * OpenVPN -- An application to securely tunnel IP networks
3  * over a single TCP/UDP port, with support for SSL/TLS-based
4  * session authentication and key exchange,
5  * packet encryption, packet authentication, and
6  * packet compression.
7  *
8  * Copyright (C) 2002-2021 OpenVPN Inc <sales@openvpn.net>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2
12  * as published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, write to the Free Software Foundation, Inc.,
21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22  */
23 
24 #ifdef HAVE_CONFIG_H
25 #include "config.h"
26 #elif defined(_MSC_VER)
27 #include "config-msvc.h"
28 #endif
29 
30 #include "syshead.h"
31 
32 #include "socket.h"
33 #include "fdmisc.h"
34 #include "misc.h"
35 #include "gremlin.h"
36 #include "plugin.h"
37 #include "ps.h"
38 #include "run_command.h"
39 #include "manage.h"
40 #include "misc.h"
41 #include "manage.h"
42 #include "openvpn.h"
43 #include "forward.h"
44 
45 #include "memdbg.h"
46 
47 const int proto_overhead[] = { /* indexed by PROTO_x */
48  0,
49  IPv4_UDP_HEADER_SIZE, /* IPv4 */
52  IPv6_UDP_HEADER_SIZE, /* IPv6 */
56 };
57 
58 /*
59  * Convert sockflags/getaddr_flags into getaddr_flags
60  */
61 static unsigned int
62 sf2gaf(const unsigned int getaddr_flags,
63  const unsigned int sockflags)
64 {
65  if (sockflags & SF_HOST_RANDOMIZE)
66  {
67  return getaddr_flags | GETADDR_RANDOMIZE;
68  }
69  else
70  {
71  return getaddr_flags;
72  }
73 }
74 
75 /*
76  * Functions related to the translation of DNS names to IP addresses.
77  */
78 static int
79 get_addr_generic(sa_family_t af, unsigned int flags, const char *hostname,
80  void *network, unsigned int *netbits,
81  int resolve_retry_seconds, volatile int *signal_received,
82  int msglevel)
83 {
84  char *endp, *sep, *var_host = NULL;
85  struct addrinfo *ai = NULL;
86  unsigned long bits;
87  uint8_t max_bits;
88  int ret = -1;
89 
90  if (!hostname)
91  {
92  msg(M_NONFATAL, "Can't resolve null hostname!");
93  goto out;
94  }
95 
96  /* assign family specific default values */
97  switch (af)
98  {
99  case AF_INET:
100  bits = 0;
101  max_bits = sizeof(in_addr_t) * 8;
102  break;
103 
104  case AF_INET6:
105  bits = 64;
106  max_bits = sizeof(struct in6_addr) * 8;
107  break;
108 
109  default:
110  msg(M_WARN,
111  "Unsupported AF family passed to getaddrinfo for %s (%d)",
112  hostname, af);
113  goto out;
114  }
115 
116  /* we need to modify the hostname received as input, but we don't want to
117  * touch it directly as it might be a constant string.
118  *
119  * Therefore, we clone the string here and free it at the end of the
120  * function */
121  var_host = strdup(hostname);
122  if (!var_host)
123  {
125  "Can't allocate hostname buffer for getaddrinfo");
126  goto out;
127  }
128 
129  /* check if this hostname has a /bits suffix */
130  sep = strchr(var_host, '/');
131  if (sep)
132  {
133  bits = strtoul(sep + 1, &endp, 10);
134  if ((*endp != '\0') || (bits > max_bits))
135  {
136  msg(msglevel, "IP prefix '%s': invalid '/bits' spec (%s)", hostname,
137  sep + 1);
138  goto out;
139  }
140  *sep = '\0';
141  }
142 
143  ret = openvpn_getaddrinfo(flags & ~GETADDR_HOST_ORDER, var_host, NULL,
144  resolve_retry_seconds, signal_received, af, &ai);
145  if ((ret == 0) && network)
146  {
147  struct in6_addr *ip6;
148  in_addr_t *ip4;
149 
150  switch (af)
151  {
152  case AF_INET:
153  ip4 = network;
154  *ip4 = ((struct sockaddr_in *)ai->ai_addr)->sin_addr.s_addr;
155 
156  if (flags & GETADDR_HOST_ORDER)
157  {
158  *ip4 = ntohl(*ip4);
159  }
160  break;
161 
162  case AF_INET6:
163  ip6 = network;
164  *ip6 = ((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
165  break;
166 
167  default:
168  /* can't get here because 'af' was previously checked */
169  msg(M_WARN,
170  "Unsupported AF family for %s (%d)", var_host, af);
171  goto out;
172  }
173  }
174 
175  if (netbits)
176  {
177  *netbits = bits;
178  }
179 
180  /* restore '/' separator, if any */
181  if (sep)
182  {
183  *sep = '/';
184  }
185 out:
186  freeaddrinfo(ai);
187  free(var_host);
188 
189  return ret;
190 }
191 
192 in_addr_t
193 getaddr(unsigned int flags,
194  const char *hostname,
195  int resolve_retry_seconds,
196  bool *succeeded,
197  volatile int *signal_received)
198 {
199  in_addr_t addr;
200  int status;
201 
202  status = get_addr_generic(AF_INET, flags, hostname, &addr, NULL,
203  resolve_retry_seconds, signal_received,
204  M_WARN);
205  if (status==0)
206  {
207  if (succeeded)
208  {
209  *succeeded = true;
210  }
211  return addr;
212  }
213  else
214  {
215  if (succeeded)
216  {
217  *succeeded = false;
218  }
219  return 0;
220  }
221 }
222 
223 bool
224 get_ipv6_addr(const char *hostname, struct in6_addr *network,
225  unsigned int *netbits, int msglevel)
226 {
227  if (get_addr_generic(AF_INET6, GETADDR_RESOLVE, hostname, network, netbits,
228  0, NULL, msglevel) < 0)
229  {
230  return false;
231  }
232 
233  return true; /* parsing OK, values set */
234 }
235 
236 static inline bool
237 streqnull(const char *a, const char *b)
238 {
239  if (a == NULL && b == NULL)
240  {
241  return true;
242  }
243  else if (a == NULL || b == NULL)
244  {
245  return false;
246  }
247  else
248  {
249  return streq(a, b);
250  }
251 }
252 
253 /*
254  * get_cached_dns_entry return 0 on success and -1
255  * otherwise. (like getaddrinfo)
256  */
257 static int
259  const char *hostname,
260  const char *servname,
261  int ai_family,
262  int resolve_flags,
263  struct addrinfo **ai)
264 {
265  struct cached_dns_entry *ph;
266  int flags;
267 
268  /* Only use flags that are relevant for the structure */
269  flags = resolve_flags & GETADDR_CACHE_MASK;
270 
271  for (ph = dns_cache; ph; ph = ph->next)
272  {
273  if (streqnull(ph->hostname, hostname)
274  && streqnull(ph->servname, servname)
275  && ph->ai_family == ai_family
276  && ph->flags == flags)
277  {
278  *ai = ph->ai;
279  return 0;
280  }
281  }
282  return -1;
283 }
284 
285 
286 static int
288  const char *hostname,
289  const char *servname,
290  const int af,
291  const int flags)
292 {
293  struct addrinfo *ai;
294  int status;
295 
297  hostname,
298  servname,
299  af,
300  flags,
301  &ai) == 0)
302  {
303  /* entry already cached, return success */
304  return 0;
305  }
306 
307  status = openvpn_getaddrinfo(flags, hostname, servname,
309  af, &ai);
310  if (status == 0)
311  {
312  struct cached_dns_entry *ph;
313 
314  ALLOC_OBJ_CLEAR_GC(ph, struct cached_dns_entry, &c->gc);
315  ph->ai = ai;
316  ph->hostname = hostname;
317  ph->servname = servname;
318  ph->flags = flags & GETADDR_CACHE_MASK;
319 
320  if (!c->c1.dns_cache)
321  {
322  c->c1.dns_cache = ph;
323  }
324  else
325  {
326  struct cached_dns_entry *prev = c->c1.dns_cache;
327  while (prev->next)
328  {
329  prev = prev->next;
330  }
331  prev->next = ph;
332  }
333 
335 
336  }
337  return status;
338 }
339 
340 void
342 {
343  int i;
344  struct connection_list *l = c->options.connection_list;
345  const unsigned int preresolve_flags = GETADDR_RESOLVE
348  |GETADDR_FATAL;
349 
350 
351  for (i = 0; i < l->len; ++i)
352  {
353  int status;
354  const char *remote;
355  int flags = preresolve_flags;
356 
357  struct connection_entry *ce = c->options.connection_list->array[i];
358 
359  if (proto_is_dgram(ce->proto))
360  {
361  flags |= GETADDR_DATAGRAM;
362  }
363 
365  {
366  flags |= GETADDR_RANDOMIZE;
367  }
368 
369  if (c->options.ip_remote_hint)
370  {
371  remote = c->options.ip_remote_hint;
372  }
373  else
374  {
375  remote = ce->remote;
376  }
377 
378  /* HTTP remote hostname does not need to be resolved */
379  if (!ce->http_proxy_options)
380  {
381  status = do_preresolve_host(c, remote, ce->remote_port,
382  ce->af, flags);
383  if (status != 0)
384  {
385  goto err;
386  }
387  }
388 
389  /* Preresolve proxy */
390  if (ce->http_proxy_options)
391  {
392  status = do_preresolve_host(c,
395  ce->af,
396  preresolve_flags);
397 
398  if (status != 0)
399  {
400  goto err;
401  }
402  }
403 
404  if (ce->socks_proxy_server)
405  {
406  status = do_preresolve_host(c,
407  ce->socks_proxy_server,
408  ce->socks_proxy_port,
409  ce->af,
410  flags);
411  if (status != 0)
412  {
413  goto err;
414  }
415  }
416 
417  if (ce->bind_local)
418  {
419  flags |= GETADDR_PASSIVE;
420  flags &= ~GETADDR_RANDOMIZE;
421  status = do_preresolve_host(c, ce->local, ce->local_port,
422  ce->af, flags);
423  if (status != 0)
424  {
425  goto err;
426  }
427 
428  }
429 
430  }
431  return;
432 
433 err:
434  throw_signal_soft(SIGHUP, "Preresolving failed");
435 }
436 
437 /*
438  * Translate IPv4/IPv6 addr or hostname into struct addrinfo
439  * If resolve error, try again for resolve_retry_seconds seconds.
440  */
441 int
443  const char *hostname,
444  const char *servname,
445  int resolve_retry_seconds,
446  volatile int *signal_received,
447  int ai_family,
448  struct addrinfo **res)
449 {
450  struct addrinfo hints;
451  int status;
452  int sigrec = 0;
453  int msglevel = (flags & GETADDR_FATAL) ? M_FATAL : D_RESOLVE_ERRORS;
454  struct gc_arena gc = gc_new();
455  const char *print_hostname;
456  const char *print_servname;
457 
458  ASSERT(res);
459 
460  ASSERT(hostname || servname);
461  ASSERT(!(flags & GETADDR_HOST_ORDER));
462 
463  if (servname)
464  {
465  print_servname = servname;
466  }
467  else
468  {
469  print_servname = "";
470  }
471 
472  if (flags & GETADDR_MSG_VIRT_OUT)
473  {
474  msglevel |= M_MSG_VIRT_OUT;
475  }
476 
478  && !signal_received)
479  {
480  signal_received = &sigrec;
481  }
482 
483  /* try numeric ipv6 addr first */
484  CLEAR(hints);
485  hints.ai_family = ai_family;
486  hints.ai_flags = AI_NUMERICHOST;
487 
488  if (flags & GETADDR_PASSIVE)
489  {
490  hints.ai_flags |= AI_PASSIVE;
491  }
492 
493  if (flags & GETADDR_DATAGRAM)
494  {
495  hints.ai_socktype = SOCK_DGRAM;
496  }
497  else
498  {
499  hints.ai_socktype = SOCK_STREAM;
500  }
501 
502  status = getaddrinfo(hostname, servname, &hints, res);
503 
504  if (status != 0) /* parse as numeric address failed? */
505  {
506  const int fail_wait_interval = 5; /* seconds */
507  /* Add +4 to cause integer division rounding up (1 + 4) = 5, (0+4)/5=0 */
508  int resolve_retries = (flags & GETADDR_TRY_ONCE) ? 1 :
509  ((resolve_retry_seconds + 4)/ fail_wait_interval);
510  const char *fmt;
511  int level = 0;
512 
513  if (hostname && (flags & GETADDR_RANDOMIZE))
514  {
515  hostname = hostname_randomize(hostname, &gc);
516  }
517 
518  if (hostname)
519  {
520  print_hostname = hostname;
521  }
522  else
523  {
524  print_hostname = "undefined";
525  }
526 
527  fmt = "RESOLVE: Cannot resolve host address: %s:%s (%s)";
528  if ((flags & GETADDR_MENTION_RESOLVE_RETRY)
529  && !resolve_retry_seconds)
530  {
531  fmt = "RESOLVE: Cannot resolve host address: %s:%s (%s) "
532  "(I would have retried this name query if you had "
533  "specified the --resolv-retry option.)";
534  }
535 
536  if (!(flags & GETADDR_RESOLVE) || status == EAI_FAIL)
537  {
538  msg(msglevel, "RESOLVE: Cannot parse IP address: %s:%s (%s)",
539  print_hostname,print_servname, gai_strerror(status));
540  goto done;
541  }
542 
543 #ifdef ENABLE_MANAGEMENT
545  {
546  if (management)
547  {
550  NULL,
551  NULL,
552  NULL,
553  NULL,
554  NULL);
555  }
556  }
557 #endif
558 
559  /*
560  * Resolve hostname
561  */
562  while (true)
563  {
564 #ifndef _WIN32
565  /* force resolv.conf reload */
566  res_init();
567 #endif
568  /* try hostname lookup */
569  hints.ai_flags &= ~AI_NUMERICHOST;
571  "GETADDRINFO flags=0x%04x ai_family=%d ai_socktype=%d",
572  flags, hints.ai_family, hints.ai_socktype);
573  status = getaddrinfo(hostname, servname, &hints, res);
574 
575  if (signal_received)
576  {
577  get_signal(signal_received);
578  if (*signal_received) /* were we interrupted by a signal? */
579  {
580  if (*signal_received == SIGUSR1) /* ignore SIGUSR1 */
581  {
582  msg(level,
583  "RESOLVE: Ignored SIGUSR1 signal received during "
584  "DNS resolution attempt");
585  *signal_received = 0;
586  }
587  else
588  {
589  /* turn success into failure (interrupted syscall) */
590  if (0 == status)
591  {
592  ASSERT(res);
593  freeaddrinfo(*res);
594  *res = NULL;
595  status = EAI_AGAIN; /* = temporary failure */
596  errno = EINTR;
597  }
598  goto done;
599  }
600  }
601  }
602 
603  /* success? */
604  if (0 == status)
605  {
606  break;
607  }
608 
609  /* resolve lookup failed, should we
610  * continue or fail? */
611  level = msglevel;
612  if (resolve_retries > 0)
613  {
614  level = D_RESOLVE_ERRORS;
615  }
616 
617  msg(level,
618  fmt,
619  print_hostname,
620  print_servname,
621  gai_strerror(status));
622 
623  if (--resolve_retries <= 0)
624  {
625  goto done;
626  }
627 
628  management_sleep(fail_wait_interval);
629  }
630 
631  ASSERT(res);
632 
633  /* hostname resolve succeeded */
634 
635  /*
636  * Do not choose an IP Addresse by random or change the order *
637  * of IP addresses, doing so will break RFC 3484 address selection *
638  */
639  }
640  else
641  {
642  /* IP address parse succeeded */
643  if (flags & GETADDR_RANDOMIZE)
644  {
645  msg(M_WARN,
646  "WARNING: ignoring --remote-random-hostname because the "
647  "hostname is an IP address");
648  }
649  }
650 
651 done:
652  if (signal_received && *signal_received)
653  {
654  int level = 0;
655  if (flags & GETADDR_FATAL_ON_SIGNAL)
656  {
657  level = M_FATAL;
658  }
659  else if (flags & GETADDR_WARN_ON_SIGNAL)
660  {
661  level = M_WARN;
662  }
663  msg(level, "RESOLVE: signal received during DNS resolution attempt");
664  }
665 
666  gc_free(&gc);
667  return status;
668 }
669 
670 /*
671  * We do our own inet_aton because the glibc function
672  * isn't very good about error checking.
673  */
674 int
675 openvpn_inet_aton(const char *dotted_quad, struct in_addr *addr)
676 {
677  unsigned int a, b, c, d;
678 
679  CLEAR(*addr);
680  if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) == 4)
681  {
682  if (a < 256 && b < 256 && c < 256 && d < 256)
683  {
684  addr->s_addr = htonl(a<<24 | b<<16 | c<<8 | d);
685  return OIA_IP; /* good dotted quad */
686  }
687  }
688  if (string_class(dotted_quad, CC_DIGIT|CC_DOT, 0))
689  {
690  return OIA_ERROR; /* probably a badly formatted dotted quad */
691  }
692  else
693  {
694  return OIA_HOSTNAME; /* probably a hostname */
695  }
696 }
697 
698 bool
699 ip_addr_dotted_quad_safe(const char *dotted_quad)
700 {
701  /* verify non-NULL */
702  if (!dotted_quad)
703  {
704  return false;
705  }
706 
707  /* verify length is within limits */
708  if (strlen(dotted_quad) > 15)
709  {
710  return false;
711  }
712 
713  /* verify that all chars are either numeric or '.' and that no numeric
714  * substring is greater than 3 chars */
715  {
716  int nnum = 0;
717  const char *p = dotted_quad;
718  int c;
719 
720  while ((c = *p++))
721  {
722  if (c >= '0' && c <= '9')
723  {
724  ++nnum;
725  if (nnum > 3)
726  {
727  return false;
728  }
729  }
730  else if (c == '.')
731  {
732  nnum = 0;
733  }
734  else
735  {
736  return false;
737  }
738  }
739  }
740 
741  /* verify that string will convert to IP address */
742  {
743  struct in_addr a;
744  return openvpn_inet_aton(dotted_quad, &a) == OIA_IP;
745  }
746 }
747 
748 bool
749 ipv6_addr_safe(const char *ipv6_text_addr)
750 {
751  /* verify non-NULL */
752  if (!ipv6_text_addr)
753  {
754  return false;
755  }
756 
757  /* verify length is within limits */
758  if (strlen(ipv6_text_addr) > INET6_ADDRSTRLEN)
759  {
760  return false;
761  }
762 
763  /* verify that string will convert to IPv6 address */
764  {
765  struct in6_addr a6;
766  return inet_pton( AF_INET6, ipv6_text_addr, &a6 ) == 1;
767  }
768 }
769 
770 static bool
771 dns_addr_safe(const char *addr)
772 {
773  if (addr)
774  {
775  const size_t len = strlen(addr);
776  return len > 0 && len <= 255 && string_class(addr, CC_ALNUM|CC_DASH|CC_DOT, 0);
777  }
778  else
779  {
780  return false;
781  }
782 }
783 
784 bool
785 ip_or_dns_addr_safe(const char *addr, const bool allow_fqdn)
786 {
787  if (ip_addr_dotted_quad_safe(addr))
788  {
789  return true;
790  }
791  else if (allow_fqdn)
792  {
793  return dns_addr_safe(addr);
794  }
795  else
796  {
797  return false;
798  }
799 }
800 
801 bool
802 mac_addr_safe(const char *mac_addr)
803 {
804  /* verify non-NULL */
805  if (!mac_addr)
806  {
807  return false;
808  }
809 
810  /* verify length is within limits */
811  if (strlen(mac_addr) > 17)
812  {
813  return false;
814  }
815 
816  /* verify that all chars are either alphanumeric or ':' and that no
817  * alphanumeric substring is greater than 2 chars */
818  {
819  int nnum = 0;
820  const char *p = mac_addr;
821  int c;
822 
823  while ((c = *p++))
824  {
825  if ( (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F') )
826  {
827  ++nnum;
828  if (nnum > 2)
829  {
830  return false;
831  }
832  }
833  else if (c == ':')
834  {
835  nnum = 0;
836  }
837  else
838  {
839  return false;
840  }
841  }
842  }
843 
844  /* error-checking is left to script invoked in lladdr.c */
845  return true;
846 }
847 
848 static int
850 {
851 #if defined(SOL_SOCKET) && defined(SO_SNDBUF)
852  int val;
853  socklen_t len;
854 
855  len = sizeof(val);
856  if (getsockopt(sd, SOL_SOCKET, SO_SNDBUF, (void *) &val, &len) == 0
857  && len == sizeof(val))
858  {
859  return val;
860  }
861 #endif
862  return 0;
863 }
864 
865 static void
867 {
868 #if defined(SOL_SOCKET) && defined(SO_SNDBUF)
869  if (setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (void *) &size, sizeof(size)) != 0)
870  {
871  msg(M_WARN, "NOTE: setsockopt SO_SNDBUF=%d failed", size);
872  }
873 #endif
874 }
875 
876 static int
878 {
879 #if defined(SOL_SOCKET) && defined(SO_RCVBUF)
880  int val;
881  socklen_t len;
882 
883  len = sizeof(val);
884  if (getsockopt(sd, SOL_SOCKET, SO_RCVBUF, (void *) &val, &len) == 0
885  && len == sizeof(val))
886  {
887  return val;
888  }
889 #endif
890  return 0;
891 }
892 
893 static bool
895 {
896 #if defined(SOL_SOCKET) && defined(SO_RCVBUF)
897  if (setsockopt(sd, SOL_SOCKET, SO_RCVBUF, (void *) &size, sizeof(size)) != 0)
898  {
899  msg(M_WARN, "NOTE: setsockopt SO_RCVBUF=%d failed", size);
900  return false;
901  }
902  return true;
903 #endif
904 }
905 
906 static void
908 {
909  if (sbs)
910  {
911  const int sndbuf_old = socket_get_sndbuf(fd);
912  const int rcvbuf_old = socket_get_rcvbuf(fd);
913 
914  if (sbs->sndbuf)
915  {
916  socket_set_sndbuf(fd, sbs->sndbuf);
917  }
918 
919  if (sbs->rcvbuf)
920  {
921  socket_set_rcvbuf(fd, sbs->rcvbuf);
922  }
923 
924  msg(D_OSBUF, "Socket Buffers: R=[%d->%d] S=[%d->%d]",
925  rcvbuf_old,
926  socket_get_rcvbuf(fd),
927  sndbuf_old,
928  socket_get_sndbuf(fd));
929  }
930 }
931 
932 /*
933  * Set other socket options
934  */
935 
936 static bool
938 {
939 #if defined(_WIN32) || (defined(IPPROTO_TCP) && defined(TCP_NODELAY))
940  if (setsockopt(sd, IPPROTO_TCP, TCP_NODELAY, (void *) &state, sizeof(state)) != 0)
941  {
942  msg(M_WARN, "NOTE: setsockopt TCP_NODELAY=%d failed", state);
943  return false;
944  }
945  else
946  {
947  dmsg(D_OSBUF, "Socket flags: TCP_NODELAY=%d succeeded", state);
948  return true;
949  }
950 #else /* if defined(_WIN32) || (defined(IPPROTO_TCP) && defined(TCP_NODELAY)) */
951  msg(M_WARN, "NOTE: setsockopt TCP_NODELAY=%d failed (No kernel support)", state);
952  return false;
953 #endif
954 }
955 
956 static inline void
958 {
959 #if defined(TARGET_LINUX) && HAVE_DECL_SO_MARK
960  if (mark && setsockopt(sd, SOL_SOCKET, SO_MARK, (void *) &mark, sizeof(mark)) != 0)
961  {
962  msg(M_WARN, "NOTE: setsockopt SO_MARK=%d failed", mark);
963  }
964 #endif
965 }
966 
967 static bool
968 socket_set_flags(socket_descriptor_t sd, unsigned int sockflags)
969 {
970  if (sockflags & SF_TCP_NODELAY)
971  {
972  return socket_set_tcp_nodelay(sd, 1);
973  }
974  else
975  {
976  return true;
977  }
978 }
979 
980 bool
981 link_socket_update_flags(struct link_socket *ls, unsigned int sockflags)
982 {
983  if (ls && socket_defined(ls->sd))
984  {
985  return socket_set_flags(ls->sd, ls->sockflags = sockflags);
986  }
987  else
988  {
989  return false;
990  }
991 }
992 
993 void
994 link_socket_update_buffer_sizes(struct link_socket *ls, int rcvbuf, int sndbuf)
995 {
996  if (ls && socket_defined(ls->sd))
997  {
998  ls->socket_buffer_sizes.sndbuf = sndbuf;
999  ls->socket_buffer_sizes.rcvbuf = rcvbuf;
1001  }
1002 }
1003 
1004 /*
1005  * SOCKET INITIALIZATION CODE.
1006  * Create a TCP/UDP socket
1007  */
1008 
1010 create_socket_tcp(struct addrinfo *addrinfo)
1011 {
1013 
1014  ASSERT(addrinfo);
1015  ASSERT(addrinfo->ai_socktype == SOCK_STREAM);
1016 
1017  if ((sd = socket(addrinfo->ai_family, addrinfo->ai_socktype, addrinfo->ai_protocol)) < 0)
1018  {
1019  msg(M_ERR, "Cannot create TCP socket");
1020  }
1021 
1022 #ifndef _WIN32 /* using SO_REUSEADDR on Windows will cause bind to succeed on port conflicts! */
1023  /* set SO_REUSEADDR on socket */
1024  {
1025  int on = 1;
1026  if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR,
1027  (void *) &on, sizeof(on)) < 0)
1028  {
1029  msg(M_ERR, "TCP: Cannot setsockopt SO_REUSEADDR on TCP socket");
1030  }
1031  }
1032 #endif
1033 
1034  /* set socket file descriptor to not pass across execs, so that
1035  * scripts don't have access to it */
1036  set_cloexec(sd);
1037 
1038  return sd;
1039 }
1040 
1041 static socket_descriptor_t
1042 create_socket_udp(struct addrinfo *addrinfo, const unsigned int flags)
1043 {
1045 
1046  ASSERT(addrinfo);
1047  ASSERT(addrinfo->ai_socktype == SOCK_DGRAM);
1048 
1049  if ((sd = socket(addrinfo->ai_family, addrinfo->ai_socktype, addrinfo->ai_protocol)) < 0)
1050  {
1051  msg(M_ERR, "UDP: Cannot create UDP/UDP6 socket");
1052  }
1053 #if ENABLE_IP_PKTINFO
1054  else if (flags & SF_USE_IP_PKTINFO)
1055  {
1056  int pad = 1;
1057  if (addrinfo->ai_family == AF_INET)
1058  {
1059 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
1060  if (setsockopt(sd, SOL_IP, IP_PKTINFO,
1061  (void *)&pad, sizeof(pad)) < 0)
1062  {
1063  msg(M_ERR, "UDP: failed setsockopt for IP_PKTINFO");
1064  }
1065 #elif defined(IP_RECVDSTADDR)
1066  if (setsockopt(sd, IPPROTO_IP, IP_RECVDSTADDR,
1067  (void *)&pad, sizeof(pad)) < 0)
1068  {
1069  msg(M_ERR, "UDP: failed setsockopt for IP_RECVDSTADDR");
1070  }
1071 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
1072 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
1073 #endif
1074  }
1075  else if (addrinfo->ai_family == AF_INET6)
1076  {
1077 #ifndef IPV6_RECVPKTINFO /* Some older Darwin platforms require this */
1078  if (setsockopt(sd, IPPROTO_IPV6, IPV6_PKTINFO,
1079  (void *)&pad, sizeof(pad)) < 0)
1080 #else
1081  if (setsockopt(sd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1082  (void *)&pad, sizeof(pad)) < 0)
1083 #endif
1084  { msg(M_ERR, "UDP: failed setsockopt for IPV6_RECVPKTINFO");}
1085  }
1086  }
1087 #endif /* if ENABLE_IP_PKTINFO */
1088 
1089  /* set socket file descriptor to not pass across execs, so that
1090  * scripts don't have access to it */
1091  set_cloexec(sd);
1092 
1093  return sd;
1094 }
1095 
1096 static void
1097 bind_local(struct link_socket *sock, const sa_family_t ai_family)
1098 {
1099  /* bind to local address/port */
1100  if (sock->bind_local)
1101  {
1102  if (sock->socks_proxy && sock->info.proto == PROTO_UDP)
1103  {
1104  socket_bind(sock->ctrl_sd, sock->info.lsa->bind_local,
1105  ai_family, "SOCKS", false);
1106  }
1107  else
1108  {
1109  socket_bind(sock->sd, sock->info.lsa->bind_local,
1110  ai_family,
1111  "TCP/UDP", sock->info.bind_ipv6_only);
1112  }
1113  }
1114 }
1115 
1116 static void
1117 create_socket(struct link_socket *sock, struct addrinfo *addr)
1118 {
1119  if (addr->ai_protocol == IPPROTO_UDP || addr->ai_socktype == SOCK_DGRAM)
1120  {
1121  sock->sd = create_socket_udp(addr, sock->sockflags);
1123 
1124  /* Assume that control socket and data socket to the socks proxy
1125  * are using the same IP family */
1126  if (sock->socks_proxy)
1127  {
1128  /* Construct a temporary addrinfo to create the socket,
1129  * currently resolve two remote addresses is not supported,
1130  * TODO: Rewrite the whole resolve_remote */
1131  struct addrinfo addrinfo_tmp = *addr;
1132  addrinfo_tmp.ai_socktype = SOCK_STREAM;
1133  addrinfo_tmp.ai_protocol = IPPROTO_TCP;
1134  sock->ctrl_sd = create_socket_tcp(&addrinfo_tmp);
1135  }
1136  }
1137  else if (addr->ai_protocol == IPPROTO_TCP || addr->ai_socktype == SOCK_STREAM)
1138  {
1139  sock->sd = create_socket_tcp(addr);
1140  }
1141  else
1142  {
1143  ASSERT(0);
1144  }
1145  /* set socket buffers based on --sndbuf and --rcvbuf options */
1146  socket_set_buffers(sock->sd, &sock->socket_buffer_sizes);
1147 
1148  /* set socket to --mark packets with given value */
1149  socket_set_mark(sock->sd, sock->mark);
1150 
1151 #if defined(TARGET_LINUX)
1152  if (sock->bind_dev)
1153  {
1154  msg(M_INFO, "Using bind-dev %s", sock->bind_dev);
1155  if (setsockopt(sock->sd, SOL_SOCKET, SO_BINDTODEVICE, sock->bind_dev, strlen(sock->bind_dev) + 1) != 0)
1156  {
1157  msg(M_WARN|M_ERRNO, "WARN: setsockopt SO_BINDTODEVICE=%s failed", sock->bind_dev);
1158  }
1159 
1160  }
1161 #endif
1162 
1163  bind_local(sock, addr->ai_family);
1164 }
1165 
1166 #ifdef TARGET_ANDROID
1167 static void
1168 protect_fd_nonlocal(int fd, const struct sockaddr *addr)
1169 {
1170  /* pass socket FD to management interface to pass on to VPNService API
1171  * as "protected socket" (exempt from being routed into tunnel)
1172  */
1173  if (addr_local(addr))
1174  {
1175  msg(D_SOCKET_DEBUG, "Address is local, not protecting socket fd %d", fd);
1176  return;
1177  }
1178 
1179  msg(D_SOCKET_DEBUG, "Protecting socket fd %d", fd);
1180  management->connection.fdtosend = fd;
1181  management_android_control(management, "PROTECTFD", __func__);
1182 }
1183 #endif
1184 
1185 /*
1186  * Functions used for establishing a TCP stream connection.
1187  */
1188 static void
1190  const struct addrinfo *local,
1191  bool do_listen,
1192  bool do_set_nonblock)
1193 {
1194  struct gc_arena gc = gc_new();
1195  if (do_listen)
1196  {
1197  ASSERT(local);
1198  msg(M_INFO, "Listening for incoming TCP connection on %s",
1199  print_sockaddr(local->ai_addr, &gc));
1200  if (listen(sd, 32))
1201  {
1202  msg(M_ERR, "TCP: listen() failed");
1203  }
1204  }
1205 
1206  /* set socket to non-blocking mode */
1207  if (do_set_nonblock)
1208  {
1209  set_nonblock(sd);
1210  }
1211 
1212  gc_free(&gc);
1213 }
1214 
1217  struct link_socket_actual *act,
1218  const bool nowait)
1219 {
1220  /* af_addr_size WILL return 0 in this case if AFs other than AF_INET
1221  * are compiled because act is empty here.
1222  * could use getsockname() to support later remote_len check
1223  */
1224  socklen_t remote_len_af = af_addr_size(act->dest.addr.sa.sa_family);
1225  socklen_t remote_len = sizeof(act->dest.addr);
1227 
1228  CLEAR(*act);
1229 
1230  if (nowait)
1231  {
1232  new_sd = getpeername(sd, &act->dest.addr.sa, &remote_len);
1233 
1234  if (!socket_defined(new_sd))
1235  {
1236  msg(D_LINK_ERRORS | M_ERRNO, "TCP: getpeername() failed");
1237  }
1238  else
1239  {
1240  new_sd = sd;
1241  }
1242  }
1243  else
1244  {
1245  new_sd = accept(sd, &act->dest.addr.sa, &remote_len);
1246  }
1247 
1248 #if 0 /* For debugging only, test the effect of accept() failures */
1249  {
1250  static int foo = 0;
1251  ++foo;
1252  if (foo & 1)
1253  {
1254  new_sd = -1;
1255  }
1256  }
1257 #endif
1258 
1259  if (!socket_defined(new_sd))
1260  {
1261  msg(D_LINK_ERRORS | M_ERRNO, "TCP: accept(%d) failed", (int)sd);
1262  }
1263  /* only valid if we have remote_len_af!=0 */
1264  else if (remote_len_af && remote_len != remote_len_af)
1265  {
1266  msg(D_LINK_ERRORS, "TCP: Received strange incoming connection with unknown address length=%d", remote_len);
1267  openvpn_close_socket(new_sd);
1268  new_sd = SOCKET_UNDEFINED;
1269  }
1270  else
1271  {
1272  /* set socket file descriptor to not pass across execs, so that
1273  * scripts don't have access to it */
1274  set_cloexec(sd);
1275  }
1276  return new_sd;
1277 }
1278 
1279 static void
1281 {
1282  struct gc_arena gc = gc_new();
1283  msg(M_INFO, "TCP connection established with %s",
1284  print_link_socket_actual(act, &gc));
1285  gc_free(&gc);
1286 }
1287 
1288 static socket_descriptor_t
1290  struct link_socket_actual *act,
1291  const char *remote_dynamic,
1292  const struct addrinfo *local,
1293  bool do_listen,
1294  bool nowait,
1295  volatile int *signal_received)
1296 {
1297  struct gc_arena gc = gc_new();
1298  /* struct openvpn_sockaddr *remote = &act->dest; */
1299  struct openvpn_sockaddr remote_verify = act->dest;
1301 
1302  CLEAR(*act);
1303  socket_do_listen(sd, local, do_listen, true);
1304 
1305  while (true)
1306  {
1307  int status;
1308  fd_set reads;
1309  struct timeval tv;
1310 
1311  FD_ZERO(&reads);
1312  openvpn_fd_set(sd, &reads);
1313  tv.tv_sec = 0;
1314  tv.tv_usec = 0;
1315 
1316  status = select(sd + 1, &reads, NULL, NULL, &tv);
1317 
1318  get_signal(signal_received);
1319  if (*signal_received)
1320  {
1321  gc_free(&gc);
1322  return sd;
1323  }
1324 
1325  if (status < 0)
1326  {
1327  msg(D_LINK_ERRORS | M_ERRNO, "TCP: select() failed");
1328  }
1329 
1330  if (status <= 0)
1331  {
1332  management_sleep(1);
1333  continue;
1334  }
1335 
1336  new_sd = socket_do_accept(sd, act, nowait);
1337 
1338  if (socket_defined(new_sd))
1339  {
1340  struct addrinfo *ai = NULL;
1341  if (remote_dynamic)
1342  {
1343  openvpn_getaddrinfo(0, remote_dynamic, NULL, 1, NULL,
1344  remote_verify.addr.sa.sa_family, &ai);
1345  }
1346 
1347  if (ai && !addrlist_match(&remote_verify, ai))
1348  {
1349  msg(M_WARN,
1350  "TCP NOTE: Rejected connection attempt from %s due to --remote setting",
1351  print_link_socket_actual(act, &gc));
1352  if (openvpn_close_socket(new_sd))
1353  {
1354  msg(M_ERR, "TCP: close socket failed (new_sd)");
1355  }
1356  freeaddrinfo(ai);
1357  }
1358  else
1359  {
1360  if (ai)
1361  {
1362  freeaddrinfo(ai);
1363  }
1364  break;
1365  }
1366  }
1367  management_sleep(1);
1368  }
1369 
1370  if (!nowait && openvpn_close_socket(sd))
1371  {
1372  msg(M_ERR, "TCP: close socket failed (sd)");
1373  }
1374 
1376 
1377  gc_free(&gc);
1378  return new_sd;
1379 }
1380 
1381 void
1383  struct addrinfo *local,
1384  int ai_family,
1385  const char *prefix,
1386  bool ipv6only)
1387 {
1388  struct gc_arena gc = gc_new();
1389 
1390  /* FIXME (schwabe)
1391  * getaddrinfo for the bind address might return multiple AF_INET/AF_INET6
1392  * entries for the requested protocol.
1393  * For example if an address has multiple A records
1394  * What is the correct way to deal with it?
1395  */
1396 
1397  struct addrinfo *cur;
1398 
1399  ASSERT(local);
1400 
1401 
1402  /* find the first addrinfo with correct ai_family */
1403  for (cur = local; cur; cur = cur->ai_next)
1404  {
1405  if (cur->ai_family == ai_family)
1406  {
1407  break;
1408  }
1409  }
1410  if (!cur)
1411  {
1412  msg(M_FATAL, "%s: Socket bind failed: Addr to bind has no %s record",
1413  prefix, addr_family_name(ai_family));
1414  }
1415 
1416  if (ai_family == AF_INET6)
1417  {
1418  int v6only = ipv6only ? 1 : 0; /* setsockopt must have an "int" */
1419 
1420  msg(M_INFO, "setsockopt(IPV6_V6ONLY=%d)", v6only);
1421  if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &v6only, sizeof(v6only)))
1422  {
1423  msg(M_NONFATAL|M_ERRNO, "Setting IPV6_V6ONLY=%d failed", v6only);
1424  }
1425  }
1426  if (bind(sd, cur->ai_addr, cur->ai_addrlen))
1427  {
1428  msg(M_FATAL | M_ERRNO, "%s: Socket bind failed on local address %s",
1429  prefix,
1430  print_sockaddr_ex(local->ai_addr, ":", PS_SHOW_PORT, &gc));
1431  }
1432  gc_free(&gc);
1433 }
1434 
1435 int
1437  const struct sockaddr *remote,
1438  int connect_timeout,
1439  volatile int *signal_received)
1440 {
1441  int status = 0;
1442 
1443 #ifdef TARGET_ANDROID
1444  protect_fd_nonlocal(sd, remote);
1445 #endif
1446 
1447  set_nonblock(sd);
1448  status = connect(sd, remote, af_addr_size(remote->sa_family));
1449  if (status)
1450  {
1451  status = openvpn_errno();
1452  }
1453  if (
1454 #ifdef _WIN32
1455  status == WSAEWOULDBLOCK
1456 #else
1457  status == EINPROGRESS
1458 #endif
1459  )
1460  {
1461  while (true)
1462  {
1463 #if POLL
1464  struct pollfd fds[1];
1465  fds[0].fd = sd;
1466  fds[0].events = POLLOUT;
1467  status = poll(fds, 1, (connect_timeout > 0) ? 1000 : 0);
1468 #else
1469  fd_set writes;
1470  struct timeval tv;
1471 
1472  FD_ZERO(&writes);
1473  openvpn_fd_set(sd, &writes);
1474  tv.tv_sec = (connect_timeout > 0) ? 1 : 0;
1475  tv.tv_usec = 0;
1476 
1477  status = select(sd + 1, NULL, &writes, NULL, &tv);
1478 #endif
1479  if (signal_received)
1480  {
1481  get_signal(signal_received);
1482  if (*signal_received)
1483  {
1484  status = 0;
1485  break;
1486  }
1487  }
1488  if (status < 0)
1489  {
1490  status = openvpn_errno();
1491  break;
1492  }
1493  if (status <= 0)
1494  {
1495  if (--connect_timeout < 0)
1496  {
1497 #ifdef _WIN32
1498  status = WSAETIMEDOUT;
1499 #else
1500  status = ETIMEDOUT;
1501 #endif
1502  break;
1503  }
1504  management_sleep(0);
1505  continue;
1506  }
1507 
1508  /* got it */
1509  {
1510  int val = 0;
1511  socklen_t len;
1512 
1513  len = sizeof(val);
1514  if (getsockopt(sd, SOL_SOCKET, SO_ERROR, (void *) &val, &len) == 0
1515  && len == sizeof(val))
1516  {
1517  status = val;
1518  }
1519  else
1520  {
1521  status = openvpn_errno();
1522  }
1523  break;
1524  }
1525  }
1526  }
1527 
1528  return status;
1529 }
1530 
1531 void
1532 set_actual_address(struct link_socket_actual *actual, struct addrinfo *ai)
1533 {
1534  CLEAR(*actual);
1535  ASSERT(ai);
1536 
1537  if (ai->ai_family == AF_INET)
1538  {
1539  actual->dest.addr.in4 =
1540  *((struct sockaddr_in *) ai->ai_addr);
1541  }
1542  else if (ai->ai_family == AF_INET6)
1543  {
1544  actual->dest.addr.in6 =
1545  *((struct sockaddr_in6 *) ai->ai_addr);
1546  }
1547  else
1548  {
1549  ASSERT(0);
1550  }
1551 
1552 }
1553 
1554 static void
1556  const struct sockaddr *dest,
1557  const int connect_timeout,
1558  struct signal_info *sig_info)
1559 {
1560  struct gc_arena gc = gc_new();
1561  int status;
1562 
1563  msg(M_INFO, "Attempting to establish TCP connection with %s",
1564  print_sockaddr(dest, &gc));
1565 
1566 #ifdef ENABLE_MANAGEMENT
1567  if (management)
1568  {
1571  NULL,
1572  NULL,
1573  NULL,
1574  NULL,
1575  NULL);
1576  }
1577 #endif
1578 
1579  /* Set the actual address */
1580  status = openvpn_connect(*sd, dest, connect_timeout, &sig_info->signal_received);
1581 
1582  get_signal(&sig_info->signal_received);
1583  if (sig_info->signal_received)
1584  {
1585  goto done;
1586  }
1587 
1588  if (status)
1589  {
1590 
1591  msg(D_LINK_ERRORS, "TCP: connect to %s failed: %s",
1592  print_sockaddr(dest, &gc), strerror(status));
1593 
1594  openvpn_close_socket(*sd);
1595  *sd = SOCKET_UNDEFINED;
1596  sig_info->signal_received = SIGUSR1;
1598  }
1599  else
1600  {
1601  msg(M_INFO, "TCP connection established with %s",
1602  print_sockaddr(dest, &gc));
1603  }
1604 
1605 done:
1606  gc_free(&gc);
1607 }
1608 
1609 /*
1610  * Stream buffer handling prototypes -- stream_buf is a helper class
1611  * to assist in the packetization of stream transport protocols
1612  * such as TCP.
1613  */
1614 
1615 static void
1616 stream_buf_init(struct stream_buf *sb, struct buffer *buf,
1617  const unsigned int sockflags, const int proto);
1618 
1619 static void
1620 stream_buf_close(struct stream_buf *sb);
1621 
1622 static bool
1623 stream_buf_added(struct stream_buf *sb, int length_added);
1624 
1625 /* For stream protocols, allocate a buffer to build up packet.
1626  * Called after frame has been finalized. */
1627 
1628 static void
1629 socket_frame_init(const struct frame *frame, struct link_socket *sock)
1630 {
1631 #ifdef _WIN32
1632  overlapped_io_init(&sock->reads, frame, FALSE, false);
1633  overlapped_io_init(&sock->writes, frame, TRUE, false);
1634  sock->rw_handle.read = sock->reads.overlapped.hEvent;
1635  sock->rw_handle.write = sock->writes.overlapped.hEvent;
1636 #endif
1637 
1639  {
1640 #ifdef _WIN32
1641  stream_buf_init(&sock->stream_buf,
1642  &sock->reads.buf_init,
1643  sock->sockflags,
1644  sock->info.proto);
1645 #else
1647  frame,
1648  false,
1650 
1651  stream_buf_init(&sock->stream_buf,
1652  &sock->stream_buf_data,
1653  sock->sockflags,
1654  sock->info.proto);
1655 #endif
1656  }
1657 }
1658 
1659 /*
1660  * Adjust frame structure based on a Path MTU value given
1661  * to us by the OS.
1662  */
1663 void
1664 frame_adjust_path_mtu(struct frame *frame, int pmtu, int proto)
1665 {
1667 }
1668 
1669 static void
1671 {
1672  struct gc_arena gc = gc_new();
1673 
1674  /* resolve local address if undefined */
1675  if (!sock->info.lsa->bind_local)
1676  {
1679  int status;
1680 
1681  if (proto_is_dgram(sock->info.proto))
1682  {
1683  flags |= GETADDR_DATAGRAM;
1684  }
1685 
1686  /* will return AF_{INET|INET6}from local_host */
1687  status = get_cached_dns_entry(sock->dns_cache,
1688  sock->local_host,
1689  sock->local_port,
1690  af,
1691  flags,
1692  &sock->info.lsa->bind_local);
1693 
1694  if (status)
1695  {
1696  status = openvpn_getaddrinfo(flags, sock->local_host, sock->local_port, 0,
1697  NULL, af, &sock->info.lsa->bind_local);
1698  }
1699 
1700  if (status !=0)
1701  {
1702  msg(M_FATAL, "getaddrinfo() failed for local \"%s:%s\": %s",
1703  sock->local_host, sock->local_port,
1704  gai_strerror(status));
1705  }
1706  }
1707 
1708  gc_free(&gc);
1709 }
1710 
1711 static void
1713  int phase,
1714  const char **remote_dynamic,
1715  volatile int *signal_received)
1716 {
1717  struct gc_arena gc = gc_new();
1718 
1719  /* resolve remote address if undefined */
1720  if (!sock->info.lsa->remote_list)
1721  {
1722  if (sock->remote_host)
1723  {
1725  int retry = 0;
1726  int status = -1;
1727  struct addrinfo *ai;
1728  if (proto_is_dgram(sock->info.proto))
1729  {
1730  flags |= GETADDR_DATAGRAM;
1731  }
1732 
1734  {
1735  if (phase == 2)
1736  {
1737  flags |= (GETADDR_TRY_ONCE | GETADDR_FATAL);
1738  }
1739  retry = 0;
1740  }
1741  else if (phase == 1)
1742  {
1743  if (sock->resolve_retry_seconds)
1744  {
1745  retry = 0;
1746  }
1747  else
1748  {
1750  retry = 0;
1751  }
1752  }
1753  else if (phase == 2)
1754  {
1755  if (sock->resolve_retry_seconds)
1756  {
1757  flags |= GETADDR_FATAL;
1758  retry = sock->resolve_retry_seconds;
1759  }
1760  else
1761  {
1762  ASSERT(0);
1763  }
1764  }
1765  else
1766  {
1767  ASSERT(0);
1768  }
1769 
1770 
1771  status = get_cached_dns_entry(sock->dns_cache,
1772  sock->remote_host,
1773  sock->remote_port,
1774  sock->info.af,
1775  flags, &ai);
1776  if (status)
1777  {
1778  status = openvpn_getaddrinfo(flags, sock->remote_host, sock->remote_port,
1779  retry, signal_received, sock->info.af, &ai);
1780  }
1781 
1782  if (status == 0)
1783  {
1784  sock->info.lsa->remote_list = ai;
1785  sock->info.lsa->current_remote = ai;
1786 
1788  "RESOLVE_REMOTE flags=0x%04x phase=%d rrs=%d sig=%d status=%d",
1789  flags,
1790  phase,
1791  retry,
1792  signal_received ? *signal_received : -1,
1793  status);
1794  }
1795  if (signal_received)
1796  {
1797  if (*signal_received)
1798  {
1799  goto done;
1800  }
1801  }
1802  if (status!=0)
1803  {
1804  if (signal_received)
1805  {
1806  *signal_received = SIGUSR1;
1807  }
1808  goto done;
1809  }
1810  }
1811  }
1812 
1813  /* should we re-use previous active remote address? */
1815  {
1816  msg(M_INFO, "TCP/UDP: Preserving recently used remote address: %s",
1817  print_link_socket_actual(&sock->info.lsa->actual, &gc));
1818  if (remote_dynamic)
1819  {
1820  *remote_dynamic = NULL;
1821  }
1822  }
1823  else
1824  {
1825  CLEAR(sock->info.lsa->actual);
1826  if (sock->info.lsa->current_remote)
1827  {
1829  sock->info.lsa->current_remote);
1830  }
1831  }
1832 
1833 done:
1834  gc_free(&gc);
1835 }
1836 
1837 
1838 
1839 struct link_socket *
1841 {
1842  struct link_socket *sock;
1843 
1844  ALLOC_OBJ_CLEAR(sock, struct link_socket);
1845  sock->sd = SOCKET_UNDEFINED;
1846  sock->ctrl_sd = SOCKET_UNDEFINED;
1847  return sock;
1848 }
1849 
1850 void
1852 {
1853  struct link_socket *sock = c->c2.link_socket;
1854  struct options *o = &c->options;
1855  ASSERT(sock);
1856 
1857  const char *remote_host = o->ce.remote;
1858  const char *remote_port = o->ce.remote_port;
1859 
1860  sock->local_host = o->ce.local;
1861  sock->local_port = o->ce.local_port;
1862  sock->remote_host = remote_host;
1863  sock->remote_port = remote_port;
1864  sock->dns_cache = c->c1.dns_cache;
1865  sock->http_proxy = c->c1.http_proxy;
1866  sock->socks_proxy = c->c1.socks_proxy;
1867  sock->bind_local = o->ce.bind_local;
1870 
1871 #ifdef ENABLE_DEBUG
1872  sock->gremlin = o->gremlin;
1873 #endif
1874 
1875  sock->socket_buffer_sizes.rcvbuf = o->rcvbuf;
1876  sock->socket_buffer_sizes.sndbuf = o->sndbuf;
1877 
1878  sock->sockflags = o->sockflags;
1879 #if PORT_SHARE
1880  if (o->port_share_host && o->port_share_port)
1881  {
1882  sock->sockflags |= SF_PORT_SHARE;
1883  }
1884 #endif
1885  sock->mark = o->mark;
1886  sock->bind_dev = o->bind_dev;
1887 
1888  sock->info.proto = o->ce.proto;
1889  sock->info.af = o->ce.af;
1890  sock->info.remote_float = o->ce.remote_float;
1891  sock->info.lsa = &c->c1.link_socket_addr;
1892  sock->info.bind_ipv6_only = o->ce.bind_ipv6_only;
1893  sock->info.ipchange_command = o->ipchange;
1894  sock->info.plugins = c->plugins;
1896 
1897  sock->mode = mode;
1898  if (mode == LS_MODE_TCP_ACCEPT_FROM)
1899  {
1900  ASSERT(c->c2.accept_from);
1901  ASSERT(sock->info.proto == PROTO_TCP_SERVER);
1902  sock->sd = c->c2.accept_from->sd;
1903  /* inherit (possibly guessed) info AF from parent context */
1904  sock->info.af = c->c2.accept_from->info.af;
1905  }
1906 
1907  /* are we running in HTTP proxy mode? */
1908  if (sock->http_proxy)
1909  {
1910  ASSERT(sock->info.proto == PROTO_TCP_CLIENT);
1911 
1912  /* the proxy server */
1913  sock->remote_host = c->c1.http_proxy->options.server;
1914  sock->remote_port = c->c1.http_proxy->options.port;
1915 
1916  /* the OpenVPN server we will use the proxy to connect to */
1917  sock->proxy_dest_host = remote_host;
1918  sock->proxy_dest_port = remote_port;
1919  }
1920  /* or in Socks proxy mode? */
1921  else if (sock->socks_proxy)
1922  {
1923  /* the proxy server */
1924  sock->remote_host = c->c1.socks_proxy->server;
1925  sock->remote_port = c->c1.socks_proxy->port;
1926 
1927  /* the OpenVPN server we will use the proxy to connect to */
1928  sock->proxy_dest_host = remote_host;
1929  sock->proxy_dest_port = remote_port;
1930  }
1931  else
1932  {
1933  sock->remote_host = remote_host;
1934  sock->remote_port = remote_port;
1935  }
1936 
1937  /* bind behavior for TCP server vs. client */
1938  if (sock->info.proto == PROTO_TCP_SERVER)
1939  {
1940  if (sock->mode == LS_MODE_TCP_ACCEPT_FROM)
1941  {
1942  sock->bind_local = false;
1943  }
1944  else
1945  {
1946  sock->bind_local = true;
1947  }
1948  }
1949 
1950  if (mode != LS_MODE_TCP_ACCEPT_FROM)
1951  {
1952  if (sock->bind_local)
1953  {
1954  resolve_bind_local(sock, sock->info.af);
1955  }
1956  resolve_remote(sock, 1, NULL, NULL);
1957  }
1958 }
1959 
1960 static void
1962 {
1963  /* set misc socket parameters */
1964  socket_set_flags(sock->sd, sock->sockflags);
1965 
1966  /* set socket to non-blocking mode */
1967  set_nonblock(sock->sd);
1968 
1969  /* set Path MTU discovery options on the socket */
1970  set_mtu_discover_type(sock->sd, sock->mtu_discover_type, sock->info.af);
1971 
1972 #if EXTENDED_SOCKET_ERROR_CAPABILITY
1973  /* if the OS supports it, enable extended error passing on the socket */
1974  set_sock_extended_error_passing(sock->sd);
1975 #endif
1976 }
1977 
1978 
1979 static void
1981 {
1982  struct gc_arena gc = gc_new();
1983  const int msglevel = (sock->mode == LS_MODE_TCP_ACCEPT_FROM) ? D_INIT_MEDIUM : M_INFO;
1984 
1985  /* print local address */
1986  if (sock->bind_local)
1987  {
1988  sa_family_t ai_family = sock->info.lsa->actual.dest.addr.sa.sa_family;
1989  /* Socket is always bound on the first matching address,
1990  * For bound sockets with no remote addr this is the element of
1991  * the list */
1992  struct addrinfo *cur;
1993  for (cur = sock->info.lsa->bind_local; cur; cur = cur->ai_next)
1994  {
1995  if (!ai_family || ai_family == cur->ai_family)
1996  {
1997  break;
1998  }
1999  }
2000  ASSERT(cur);
2001  msg(msglevel, "%s link local (bound): %s",
2002  proto2ascii(sock->info.proto, sock->info.af, true),
2003  print_sockaddr(cur->ai_addr,&gc));
2004  }
2005  else
2006  {
2007  msg(msglevel, "%s link local: (not bound)",
2008  proto2ascii(sock->info.proto, sock->info.af, true));
2009  }
2010 
2011  /* print active remote address */
2012  msg(msglevel, "%s link remote: %s",
2013  proto2ascii(sock->info.proto, sock->info.af, true),
2015  ":",
2017  &gc));
2018  gc_free(&gc);
2019 }
2020 
2021 static void
2022 phase2_tcp_server(struct link_socket *sock, const char *remote_dynamic,
2023  volatile int *signal_received)
2024 {
2025  switch (sock->mode)
2026  {
2027  case LS_MODE_DEFAULT:
2028  sock->sd = socket_listen_accept(sock->sd,
2029  &sock->info.lsa->actual,
2030  remote_dynamic,
2031  sock->info.lsa->bind_local,
2032  true,
2033  false,
2034  signal_received);
2035  break;
2036 
2037  case LS_MODE_TCP_LISTEN:
2038  socket_do_listen(sock->sd,
2039  sock->info.lsa->bind_local,
2040  true,
2041  false);
2042  break;
2043 
2045  sock->sd = socket_do_accept(sock->sd,
2046  &sock->info.lsa->actual,
2047  false);
2048  if (!socket_defined(sock->sd))
2049  {
2050  *signal_received = SIGTERM;
2051  return;
2052  }
2054  break;
2055 
2056  default:
2057  ASSERT(0);
2058  }
2059 }
2060 
2061 
2062 static void
2063 phase2_tcp_client(struct link_socket *sock, struct signal_info *sig_info)
2064 {
2065  bool proxy_retry = false;
2066  do
2067  {
2068  socket_connect(&sock->sd,
2069  sock->info.lsa->current_remote->ai_addr,
2071  sig_info);
2072 
2073  if (sig_info->signal_received)
2074  {
2075  return;
2076  }
2077 
2078  if (sock->http_proxy)
2079  {
2080  proxy_retry = establish_http_proxy_passthru(sock->http_proxy,
2081  sock->sd,
2082  sock->proxy_dest_host,
2083  sock->proxy_dest_port,
2084  sock->server_poll_timeout,
2085  &sock->stream_buf.residual,
2086  &sig_info->signal_received);
2087  }
2088  else if (sock->socks_proxy)
2089  {
2091  sock->sd,
2092  sock->proxy_dest_host,
2093  sock->proxy_dest_port,
2094  &sig_info->signal_received);
2095  }
2096  if (proxy_retry)
2097  {
2098  openvpn_close_socket(sock->sd);
2099  sock->sd = create_socket_tcp(sock->info.lsa->current_remote);
2100  }
2101 
2102  } while (proxy_retry);
2103 
2104 }
2105 
2106 static void
2107 phase2_socks_client(struct link_socket *sock, struct signal_info *sig_info)
2108 {
2109  socket_connect(&sock->ctrl_sd,
2110  sock->info.lsa->current_remote->ai_addr,
2112  sig_info);
2113 
2114  if (sig_info->signal_received)
2115  {
2116  return;
2117  }
2118 
2120  sock->ctrl_sd,
2121  sock->sd,
2122  &sock->socks_relay.dest,
2123  &sig_info->signal_received);
2124 
2125  if (sig_info->signal_received)
2126  {
2127  return;
2128  }
2129 
2130  sock->remote_host = sock->proxy_dest_host;
2131  sock->remote_port = sock->proxy_dest_port;
2132 
2133  addr_zero_host(&sock->info.lsa->actual.dest);
2134  if (sock->info.lsa->remote_list)
2135  {
2136  freeaddrinfo(sock->info.lsa->remote_list);
2137  sock->info.lsa->current_remote = NULL;
2138  sock->info.lsa->remote_list = NULL;
2139  }
2140 
2141  resolve_remote(sock, 1, NULL, &sig_info->signal_received);
2142 }
2143 
2144 /* finalize socket initialization */
2145 void
2147 {
2148  struct link_socket *sock = c->c2.link_socket;
2149  const struct frame *frame = &c->c2.frame;
2150  struct signal_info *sig_info = c->sig;
2151 
2152  const char *remote_dynamic = NULL;
2153  int sig_save = 0;
2154 
2155  ASSERT(sock);
2156  ASSERT(sig_info);
2157 
2158  if (sig_info->signal_received)
2159  {
2160  sig_save = sig_info->signal_received;
2161  sig_info->signal_received = 0;
2162  }
2163 
2164  /* initialize buffers */
2165  socket_frame_init(frame, sock);
2166 
2167  /*
2168  * Pass a remote name to connect/accept so that
2169  * they can test for dynamic IP address changes
2170  * and throw a SIGUSR1 if appropriate.
2171  */
2172  if (sock->resolve_retry_seconds)
2173  {
2174  remote_dynamic = sock->remote_host;
2175  }
2176 
2177  /* Second chance to resolv/create socket */
2178  resolve_remote(sock, 2, &remote_dynamic, &sig_info->signal_received);
2179 
2180  /* If a valid remote has been found, create the socket with its addrinfo */
2181  if (sock->info.lsa->current_remote)
2182  {
2183  create_socket(sock, sock->info.lsa->current_remote);
2184  }
2185 
2186  /* If socket has not already been created create it now */
2187  if (sock->sd == SOCKET_UNDEFINED)
2188  {
2189  /* If we have no --remote and have still not figured out the
2190  * protocol family to use we will use the first of the bind */
2191 
2192  if (sock->bind_local && !sock->remote_host && sock->info.lsa->bind_local)
2193  {
2194  /* Warn if this is because neither v4 or v6 was specified
2195  * and we should not connect a remote */
2196  if (sock->info.af == AF_UNSPEC)
2197  {
2198  msg(M_WARN, "Could not determine IPv4/IPv6 protocol. Using %s",
2199  addr_family_name(sock->info.lsa->bind_local->ai_family));
2200  sock->info.af = sock->info.lsa->bind_local->ai_family;
2201  }
2202 
2203  create_socket(sock, sock->info.lsa->bind_local);
2204  }
2205  }
2206 
2207  /* Socket still undefined, give a warning and abort connection */
2208  if (sock->sd == SOCKET_UNDEFINED)
2209  {
2210  msg(M_WARN, "Could not determine IPv4/IPv6 protocol");
2211  sig_info->signal_received = SIGUSR1;
2212  goto done;
2213  }
2214 
2215  if (sig_info->signal_received)
2216  {
2217  goto done;
2218  }
2219 
2220  if (sock->info.proto == PROTO_TCP_SERVER)
2221  {
2222  phase2_tcp_server(sock, remote_dynamic,
2223  &sig_info->signal_received);
2224  }
2225  else if (sock->info.proto == PROTO_TCP_CLIENT)
2226  {
2227  phase2_tcp_client(sock, sig_info);
2228 
2229  }
2230  else if (sock->info.proto == PROTO_UDP && sock->socks_proxy)
2231  {
2232  phase2_socks_client(sock, sig_info);
2233  }
2234 #ifdef TARGET_ANDROID
2235  if (sock->sd != -1)
2236  {
2237  protect_fd_nonlocal(sock->sd, &sock->info.lsa->actual.dest.addr.sa);
2238  }
2239 #endif
2240  if (sig_info->signal_received)
2241  {
2242  goto done;
2243  }
2244 
2246  linksock_print_addr(sock);
2247 
2248 done:
2249  if (sig_save)
2250  {
2251  if (!sig_info->signal_received)
2252  {
2253  sig_info->signal_received = sig_save;
2254  }
2255  }
2256 }
2257 
2258 void
2260 {
2261  if (sock)
2262  {
2263 #ifdef ENABLE_DEBUG
2264  const int gremlin = GREMLIN_CONNECTION_FLOOD_LEVEL(sock->gremlin);
2265 #else
2266  const int gremlin = 0;
2267 #endif
2268 
2269  if (socket_defined(sock->sd))
2270  {
2271 #ifdef _WIN32
2272  close_net_event_win32(&sock->listen_handle, sock->sd, 0);
2273 #endif
2274  if (!gremlin)
2275  {
2276  msg(D_LOW, "TCP/UDP: Closing socket");
2277  if (openvpn_close_socket(sock->sd))
2278  {
2279  msg(M_WARN | M_ERRNO, "TCP/UDP: Close Socket failed");
2280  }
2281  }
2282  sock->sd = SOCKET_UNDEFINED;
2283 #ifdef _WIN32
2284  if (!gremlin)
2285  {
2286  overlapped_io_close(&sock->reads);
2287  overlapped_io_close(&sock->writes);
2288  }
2289 #endif
2290  }
2291 
2292  if (socket_defined(sock->ctrl_sd))
2293  {
2294  if (openvpn_close_socket(sock->ctrl_sd))
2295  {
2296  msg(M_WARN | M_ERRNO, "TCP/UDP: Close Socket (ctrl_sd) failed");
2297  }
2298  sock->ctrl_sd = SOCKET_UNDEFINED;
2299  }
2300 
2301  stream_buf_close(&sock->stream_buf);
2302  free_buf(&sock->stream_buf_data);
2303  if (!gremlin)
2304  {
2305  free(sock);
2306  }
2307  }
2308 }
2309 
2310 /* for stream protocols, allow for packet length prefix */
2311 void
2313 {
2315  {
2317  }
2318 }
2319 
2320 void
2321 setenv_trusted(struct env_set *es, const struct link_socket_info *info)
2322 {
2323  setenv_link_socket_actual(es, "trusted", &info->lsa->actual, SA_IP_PORT);
2324 }
2325 
2326 static void
2327 ipchange_fmt(const bool include_cmd, struct argv *argv, const struct link_socket_info *info, struct gc_arena *gc)
2328 {
2329  const char *host = print_sockaddr_ex(&info->lsa->actual.dest.addr.sa, " ", PS_SHOW_PORT, gc);
2330  if (include_cmd)
2331  {
2332  argv_parse_cmd(argv, info->ipchange_command);
2333  argv_printf_cat(argv, "%s", host);
2334  }
2335  else
2336  {
2337  argv_printf(argv, "%s", host);
2338  }
2339 
2340 }
2341 
2342 void
2344  const struct link_socket_actual *act,
2345  const char *common_name,
2346  struct env_set *es)
2347 {
2348  struct gc_arena gc = gc_new();
2349 
2350  info->lsa->actual = *act; /* Note: skip this line for --force-dest */
2351  setenv_trusted(es, info);
2352  info->connection_established = true;
2353 
2354  /* Print connection initiated message, with common name if available */
2355  {
2356  struct buffer out = alloc_buf_gc(256, &gc);
2357  if (common_name)
2358  {
2359  buf_printf(&out, "[%s] ", common_name);
2360  }
2361  buf_printf(&out, "Peer Connection Initiated with %s", print_link_socket_actual(&info->lsa->actual, &gc));
2362  msg(M_INFO, "%s", BSTR(&out));
2363  }
2364 
2365  /* set environmental vars */
2366  setenv_str(es, "common_name", common_name);
2367 
2368  /* Process --ipchange plugin */
2370  {
2371  struct argv argv = argv_new();
2372  ipchange_fmt(false, &argv, info, &gc);
2374  {
2375  msg(M_WARN, "WARNING: ipchange plugin call failed");
2376  }
2377  argv_free(&argv);
2378  }
2379 
2380  /* Process --ipchange option */
2381  if (info->ipchange_command)
2382  {
2383  struct argv argv = argv_new();
2384  setenv_str(es, "script_type", "ipchange");
2385  ipchange_fmt(true, &argv, info, &gc);
2386  openvpn_run_script(&argv, es, 0, "--ipchange");
2387  argv_free(&argv);
2388  }
2389 
2390  gc_free(&gc);
2391 }
2392 
2393 void
2395  const struct link_socket_info *info,
2396  const struct link_socket_actual *from_addr)
2397 {
2398  struct gc_arena gc = gc_new();
2399  struct addrinfo *ai;
2400 
2401  switch (from_addr->dest.addr.sa.sa_family)
2402  {
2403  case AF_INET:
2404  case AF_INET6:
2406  "TCP/UDP: Incoming packet rejected from %s[%d], expected peer address: %s (allow this incoming source address/port by removing --remote or adding --float)",
2407  print_link_socket_actual(from_addr, &gc),
2408  (int)from_addr->dest.addr.sa.sa_family,
2409  print_sockaddr_ex(info->lsa->remote_list->ai_addr,":",PS_SHOW_PORT, &gc));
2410  /* print additional remote addresses */
2411  for (ai = info->lsa->remote_list->ai_next; ai; ai = ai->ai_next)
2412  {
2413  msg(D_LINK_ERRORS,"or from peer address: %s",
2414  print_sockaddr_ex(ai->ai_addr,":",PS_SHOW_PORT, &gc));
2415  }
2416  break;
2417  }
2418  buf->len = 0;
2419  gc_free(&gc);
2420 }
2421 
2422 void
2424 {
2425  dmsg(D_READ_WRITE, "TCP/UDP: No outgoing address to send packet");
2426 }
2427 
2428 in_addr_t
2430 {
2431  const struct link_socket_addr *lsa = info->lsa;
2432 
2433 /*
2434  * This logic supports "redirect-gateway" semantic, which
2435  * makes sense only for PF_INET routes over PF_INET endpoints
2436  *
2437  * Maybe in the future consider PF_INET6 endpoints also ...
2438  * by now just ignore it
2439  *
2440  * For --remote entries with multiple addresses this
2441  * only return the actual endpoint we have successfully connected to
2442  */
2443  if (lsa->actual.dest.addr.sa.sa_family != AF_INET)
2444  {
2445  return IPV4_INVALID_ADDR;
2446  }
2447 
2449  {
2450  return ntohl(lsa->actual.dest.addr.in4.sin_addr.s_addr);
2451  }
2452  else if (lsa->current_remote)
2453  {
2454  return ntohl(((struct sockaddr_in *)lsa->current_remote->ai_addr)
2455  ->sin_addr.s_addr);
2456  }
2457  else
2458  {
2459  return 0;
2460  }
2461 }
2462 
2463 const struct in6_addr *
2465 {
2466  const struct link_socket_addr *lsa = info->lsa;
2467 
2468 /* This logic supports "redirect-gateway" semantic,
2469  * for PF_INET6 routes over PF_INET6 endpoints
2470  *
2471  * For --remote entries with multiple addresses this
2472  * only return the actual endpoint we have successfully connected to
2473  */
2474  if (lsa->actual.dest.addr.sa.sa_family != AF_INET6)
2475  {
2476  return NULL;
2477  }
2478 
2480  {
2481  return &(lsa->actual.dest.addr.in6.sin6_addr);
2482  }
2483  else if (lsa->current_remote)
2484  {
2485  return &(((struct sockaddr_in6 *)lsa->current_remote->ai_addr)->sin6_addr);
2486  }
2487  else
2488  {
2489  return NULL;
2490  }
2491 }
2492 
2493 /*
2494  * Return a status string describing socket state.
2495  */
2496 const char *
2497 socket_stat(const struct link_socket *s, unsigned int rwflags, struct gc_arena *gc)
2498 {
2499  struct buffer out = alloc_buf_gc(64, gc);
2500  if (s)
2501  {
2502  if (rwflags & EVENT_READ)
2503  {
2504  buf_printf(&out, "S%s",
2505  (s->rwflags_debug & EVENT_READ) ? "R" : "r");
2506 #ifdef _WIN32
2507  buf_printf(&out, "%s",
2509 #endif
2510  }
2511  if (rwflags & EVENT_WRITE)
2512  {
2513  buf_printf(&out, "S%s",
2514  (s->rwflags_debug & EVENT_WRITE) ? "W" : "w");
2515 #ifdef _WIN32
2516  buf_printf(&out, "%s",
2518 #endif
2519  }
2520  }
2521  else
2522  {
2523  buf_printf(&out, "S?");
2524  }
2525  return BSTR(&out);
2526 }
2527 
2528 /*
2529  * Stream buffer functions, used to packetize a TCP
2530  * stream connection.
2531  */
2532 
2533 static inline void
2535 {
2536  dmsg(D_STREAM_DEBUG, "STREAM: RESET");
2537  sb->residual_fully_formed = false;
2538  sb->buf = sb->buf_init;
2539  buf_reset(&sb->next);
2540  sb->len = -1;
2541 }
2542 
2543 static void
2545  struct buffer *buf,
2546  const unsigned int sockflags,
2547  const int proto)
2548 {
2549  sb->buf_init = *buf;
2550  sb->maxlen = sb->buf_init.len;
2551  sb->buf_init.len = 0;
2552  sb->residual = alloc_buf(sb->maxlen);
2553  sb->error = false;
2554 #if PORT_SHARE
2555  sb->port_share_state = ((sockflags & SF_PORT_SHARE) && (proto == PROTO_TCP_SERVER))
2556  ? PS_ENABLED
2557  : PS_DISABLED;
2558 #endif
2559  stream_buf_reset(sb);
2560 
2561  dmsg(D_STREAM_DEBUG, "STREAM: INIT maxlen=%d", sb->maxlen);
2562 }
2563 
2564 static inline void
2566 {
2567  /* set up 'next' for next i/o read */
2568  sb->next = sb->buf;
2569  sb->next.offset = sb->buf.offset + sb->buf.len;
2570  sb->next.len = (sb->len >= 0 ? sb->len : sb->maxlen) - sb->buf.len;
2571  dmsg(D_STREAM_DEBUG, "STREAM: SET NEXT, buf=[%d,%d] next=[%d,%d] len=%d maxlen=%d",
2572  sb->buf.offset, sb->buf.len,
2573  sb->next.offset, sb->next.len,
2574  sb->len, sb->maxlen);
2575  ASSERT(sb->next.len > 0);
2576  ASSERT(buf_safe(&sb->buf, sb->next.len));
2577 }
2578 
2579 static inline void
2580 stream_buf_get_final(struct stream_buf *sb, struct buffer *buf)
2581 {
2582  dmsg(D_STREAM_DEBUG, "STREAM: GET FINAL len=%d",
2583  buf_defined(&sb->buf) ? sb->buf.len : -1);
2584  ASSERT(buf_defined(&sb->buf));
2585  *buf = sb->buf;
2586 }
2587 
2588 static inline void
2589 stream_buf_get_next(struct stream_buf *sb, struct buffer *buf)
2590 {
2591  dmsg(D_STREAM_DEBUG, "STREAM: GET NEXT len=%d",
2592  buf_defined(&sb->next) ? sb->next.len : -1);
2593  ASSERT(buf_defined(&sb->next));
2594  *buf = sb->next;
2595 }
2596 
2597 bool
2599 {
2601  {
2602  ASSERT(buf_copy(&sock->stream_buf.buf, &sock->stream_buf.residual));
2603  ASSERT(buf_init(&sock->stream_buf.residual, 0));
2605  dmsg(D_STREAM_DEBUG, "STREAM: RESIDUAL FULLY FORMED [%s], len=%d",
2606  sock->stream_buf.residual_fully_formed ? "YES" : "NO",
2607  sock->stream_buf.residual.len);
2608  }
2609 
2610  if (!sock->stream_buf.residual_fully_formed)
2611  {
2613  }
2614  return !sock->stream_buf.residual_fully_formed;
2615 }
2616 
2617 static bool
2619  int length_added)
2620 {
2621  dmsg(D_STREAM_DEBUG, "STREAM: ADD length_added=%d", length_added);
2622  if (length_added > 0)
2623  {
2624  sb->buf.len += length_added;
2625  }
2626 
2627  /* if length unknown, see if we can get the length prefix from
2628  * the head of the buffer */
2629  if (sb->len < 0 && sb->buf.len >= (int) sizeof(packet_size_type))
2630  {
2631  packet_size_type net_size;
2632 
2633 #if PORT_SHARE
2634  if (sb->port_share_state == PS_ENABLED)
2635  {
2636  if (!is_openvpn_protocol(&sb->buf))
2637  {
2638  msg(D_STREAM_ERRORS, "Non-OpenVPN client protocol detected");
2639  sb->port_share_state = PS_FOREIGN;
2640  sb->error = true;
2641  return false;
2642  }
2643  else
2644  {
2645  sb->port_share_state = PS_DISABLED;
2646  }
2647  }
2648 #endif
2649 
2650  ASSERT(buf_read(&sb->buf, &net_size, sizeof(net_size)));
2651  sb->len = ntohps(net_size);
2652 
2653  if (sb->len < 1 || sb->len > sb->maxlen)
2654  {
2655  msg(M_WARN, "WARNING: Bad encapsulated packet length from peer (%d), which must be > 0 and <= %d -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attempting restart...]", sb->len, sb->maxlen);
2656  stream_buf_reset(sb);
2657  sb->error = true;
2658  return false;
2659  }
2660  }
2661 
2662  /* is our incoming packet fully read? */
2663  if (sb->len > 0 && sb->buf.len >= sb->len)
2664  {
2665  /* save any residual data that's part of the next packet */
2666  ASSERT(buf_init(&sb->residual, 0));
2667  if (sb->buf.len > sb->len)
2668  {
2669  ASSERT(buf_copy_excess(&sb->residual, &sb->buf, sb->len));
2670  }
2671  dmsg(D_STREAM_DEBUG, "STREAM: ADD returned TRUE, buf_len=%d, residual_len=%d",
2672  BLEN(&sb->buf),
2673  BLEN(&sb->residual));
2674  return true;
2675  }
2676  else
2677  {
2678  dmsg(D_STREAM_DEBUG, "STREAM: ADD returned FALSE (have=%d need=%d)", sb->buf.len, sb->len);
2679  stream_buf_set_next(sb);
2680  return false;
2681  }
2682 }
2683 
2684 static void
2686 {
2687  free_buf(&sb->residual);
2688 }
2689 
2690 /*
2691  * The listen event is a special event whose sole purpose is
2692  * to tell us that there's a new incoming connection on a
2693  * TCP socket, for use in server mode.
2694  */
2695 event_t
2697 {
2698 #ifdef _WIN32
2700  {
2701  init_net_event_win32(&s->listen_handle, FD_ACCEPT, s->sd, 0);
2702  }
2703  return &s->listen_handle;
2704 #else /* ifdef _WIN32 */
2705  return s->sd;
2706 #endif
2707 }
2708 
2709 /*
2710  * Format IP addresses in ascii
2711  */
2712 
2713 const char *
2714 print_sockaddr_ex(const struct sockaddr *sa,
2715  const char *separator,
2716  const unsigned int flags,
2717  struct gc_arena *gc)
2718 {
2719  struct buffer out = alloc_buf_gc(128, gc);
2720  bool addr_is_defined = false;
2721  char hostaddr[NI_MAXHOST] = "";
2722  char servname[NI_MAXSERV] = "";
2723  int status;
2724 
2725  socklen_t salen = 0;
2726  switch (sa->sa_family)
2727  {
2728  case AF_INET:
2729  if (!(flags & PS_DONT_SHOW_FAMILY))
2730  {
2731  buf_puts(&out, "[AF_INET]");
2732  }
2733  salen = sizeof(struct sockaddr_in);
2734  addr_is_defined = ((struct sockaddr_in *) sa)->sin_addr.s_addr != 0;
2735  break;
2736 
2737  case AF_INET6:
2738  if (!(flags & PS_DONT_SHOW_FAMILY))
2739  {
2740  buf_puts(&out, "[AF_INET6]");
2741  }
2742  salen = sizeof(struct sockaddr_in6);
2743  addr_is_defined = !IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) sa)->sin6_addr);
2744  break;
2745 
2746  case AF_UNSPEC:
2747  if (!(flags & PS_DONT_SHOW_FAMILY))
2748  {
2749  return "[AF_UNSPEC]";
2750  }
2751  else
2752  {
2753  return "";
2754  }
2755 
2756  default:
2757  ASSERT(0);
2758  }
2759 
2760  status = getnameinfo(sa, salen, hostaddr, sizeof(hostaddr),
2761  servname, sizeof(servname), NI_NUMERICHOST | NI_NUMERICSERV);
2762 
2763  if (status!=0)
2764  {
2765  buf_printf(&out,"[nameinfo() err: %s]",gai_strerror(status));
2766  return BSTR(&out);
2767  }
2768 
2769  if (!(flags & PS_DONT_SHOW_ADDR))
2770  {
2771  if (addr_is_defined)
2772  {
2773  buf_puts(&out, hostaddr);
2774  }
2775  else
2776  {
2777  buf_puts(&out, "[undef]");
2778  }
2779  }
2780 
2781  if ((flags & PS_SHOW_PORT) || (flags & PS_SHOW_PORT_IF_DEFINED))
2782  {
2783  if (separator)
2784  {
2785  buf_puts(&out, separator);
2786  }
2787 
2788  buf_puts(&out, servname);
2789  }
2790 
2791  return BSTR(&out);
2792 }
2793 
2794 const char *
2796 {
2798 }
2799 
2800 #ifndef IF_NAMESIZE
2801 #define IF_NAMESIZE 16
2802 #endif
2803 
2804 const char *
2806  const char *separator,
2807  const unsigned int flags,
2808  struct gc_arena *gc)
2809 {
2810  if (act)
2811  {
2812  struct buffer out = alloc_buf_gc(128, gc);
2813  buf_printf(&out, "%s", print_sockaddr_ex(&act->dest.addr.sa, separator, flags, gc));
2814 #if ENABLE_IP_PKTINFO
2815  char ifname[IF_NAMESIZE] = "[undef]";
2816 
2817  if ((flags & PS_SHOW_PKTINFO) && addr_defined_ipi(act))
2818  {
2819  switch (act->dest.addr.sa.sa_family)
2820  {
2821  case AF_INET:
2822  {
2823  struct openvpn_sockaddr sa;
2824  CLEAR(sa);
2825  sa.addr.in4.sin_family = AF_INET;
2826 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
2827  sa.addr.in4.sin_addr = act->pi.in4.ipi_spec_dst;
2828  if_indextoname(act->pi.in4.ipi_ifindex, ifname);
2829 #elif defined(IP_RECVDSTADDR)
2830  sa.addr.in4.sin_addr = act->pi.in4;
2831  ifname[0] = 0;
2832 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
2833 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
2834 #endif
2835  buf_printf(&out, " (via %s%%%s)",
2836  print_sockaddr_ex(&sa.addr.sa, separator, 0, gc),
2837  ifname);
2838  }
2839  break;
2840 
2841  case AF_INET6:
2842  {
2843  struct sockaddr_in6 sin6;
2844  char buf[INET6_ADDRSTRLEN] = "[undef]";
2845  CLEAR(sin6);
2846  sin6.sin6_family = AF_INET6;
2847  sin6.sin6_addr = act->pi.in6.ipi6_addr;
2848  if_indextoname(act->pi.in6.ipi6_ifindex, ifname);
2849  if (getnameinfo((struct sockaddr *)&sin6, sizeof(struct sockaddr_in6),
2850  buf, sizeof(buf), NULL, 0, NI_NUMERICHOST) == 0)
2851  {
2852  buf_printf(&out, " (via %s%%%s)", buf, ifname);
2853  }
2854  else
2855  {
2856  buf_printf(&out, " (via [getnameinfo() err]%%%s)", ifname);
2857  }
2858  }
2859  break;
2860  }
2861  }
2862 #endif /* if ENABLE_IP_PKTINFO */
2863  return BSTR(&out);
2864  }
2865  else
2866  {
2867  return "[NULL]";
2868  }
2869 }
2870 
2871 /*
2872  * Convert an in_addr_t in host byte order
2873  * to an ascii dotted quad.
2874  */
2875 const char *
2876 print_in_addr_t(in_addr_t addr, unsigned int flags, struct gc_arena *gc)
2877 {
2878  struct in_addr ia;
2879  struct buffer out = alloc_buf_gc(64, gc);
2880 
2881  if (addr || !(flags & IA_EMPTY_IF_UNDEF))
2882  {
2883  CLEAR(ia);
2884  ia.s_addr = (flags & IA_NET_ORDER) ? addr : htonl(addr);
2885 
2886  buf_printf(&out, "%s", inet_ntoa(ia));
2887  }
2888  return BSTR(&out);
2889 }
2890 
2891 /*
2892  * Convert an in6_addr in host byte order
2893  * to an ascii representation of an IPv6 address
2894  */
2895 const char *
2896 print_in6_addr(struct in6_addr a6, unsigned int flags, struct gc_arena *gc)
2897 {
2898  struct buffer out = alloc_buf_gc(64, gc);
2899  char tmp_out_buf[64]; /* inet_ntop wants pointer to buffer */
2900 
2901  if (memcmp(&a6, &in6addr_any, sizeof(a6)) != 0
2902  || !(flags & IA_EMPTY_IF_UNDEF))
2903  {
2904  inet_ntop(AF_INET6, &a6, tmp_out_buf, sizeof(tmp_out_buf)-1);
2905  buf_printf(&out, "%s", tmp_out_buf );
2906  }
2907  return BSTR(&out);
2908 }
2909 
2910 #ifndef UINT8_MAX
2911 #define UINT8_MAX 0xff
2912 #endif
2913 
2914 /* add some offset to an ipv6 address
2915  * (add in steps of 8 bits, taking overflow into next round)
2916  */
2917 struct in6_addr
2918 add_in6_addr( struct in6_addr base, uint32_t add )
2919 {
2920  int i;
2921 
2922  for (i = 15; i>=0 && add > 0; i--)
2923  {
2924  register int carry;
2925  register uint32_t h;
2926 
2927  h = (unsigned char) base.s6_addr[i];
2928  base.s6_addr[i] = (h+add) & UINT8_MAX;
2929 
2930  /* using explicit carry for the 8-bit additions will catch
2931  * 8-bit and(!) 32-bit overruns nicely
2932  */
2933  carry = ((h & 0xff) + (add & 0xff)) >> 8;
2934  add = (add>>8) + carry;
2935  }
2936  return base;
2937 }
2938 
2939 /* set environmental variables for ip/port in *addr */
2940 void
2941 setenv_sockaddr(struct env_set *es, const char *name_prefix, const struct openvpn_sockaddr *addr, const unsigned int flags)
2942 {
2943  char name_buf[256];
2944 
2945  char buf[128];
2946  switch (addr->addr.sa.sa_family)
2947  {
2948  case AF_INET:
2949  if (flags & SA_IP_PORT)
2950  {
2951  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip", name_prefix);
2952  }
2953  else
2954  {
2955  openvpn_snprintf(name_buf, sizeof(name_buf), "%s", name_prefix);
2956  }
2957 
2958  setenv_str(es, name_buf, inet_ntoa(addr->addr.in4.sin_addr));
2959 
2960  if ((flags & SA_IP_PORT) && addr->addr.in4.sin_port)
2961  {
2962  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_port", name_prefix);
2963  setenv_int(es, name_buf, ntohs(addr->addr.in4.sin_port));
2964  }
2965  break;
2966 
2967  case AF_INET6:
2968  if (IN6_IS_ADDR_V4MAPPED( &addr->addr.in6.sin6_addr ))
2969  {
2970  struct in_addr ia;
2971  memcpy(&ia.s_addr, &addr->addr.in6.sin6_addr.s6_addr[12],
2972  sizeof(ia.s_addr));
2973  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip", name_prefix);
2974  openvpn_snprintf(buf, sizeof(buf), "%s", inet_ntoa(ia) );
2975  }
2976  else
2977  {
2978  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip6", name_prefix);
2979  getnameinfo(&addr->addr.sa, sizeof(struct sockaddr_in6),
2980  buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
2981  }
2982  setenv_str(es, name_buf, buf);
2983 
2984  if ((flags & SA_IP_PORT) && addr->addr.in6.sin6_port)
2985  {
2986  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_port", name_prefix);
2987  setenv_int(es, name_buf, ntohs(addr->addr.in6.sin6_port));
2988  }
2989  break;
2990  }
2991 }
2992 
2993 void
2994 setenv_in_addr_t(struct env_set *es, const char *name_prefix, in_addr_t addr, const unsigned int flags)
2995 {
2996  if (addr || !(flags & SA_SET_IF_NONZERO))
2997  {
2998  struct openvpn_sockaddr si;
2999  CLEAR(si);
3000  si.addr.in4.sin_family = AF_INET;
3001  si.addr.in4.sin_addr.s_addr = htonl(addr);
3002  setenv_sockaddr(es, name_prefix, &si, flags);
3003  }
3004 }
3005 
3006 void
3008  const char *name_prefix,
3009  const struct in6_addr *addr,
3010  const unsigned int flags)
3011 {
3012  if (!IN6_IS_ADDR_UNSPECIFIED(addr) || !(flags & SA_SET_IF_NONZERO))
3013  {
3014  struct openvpn_sockaddr si;
3015  CLEAR(si);
3016  si.addr.in6.sin6_family = AF_INET6;
3017  si.addr.in6.sin6_addr = *addr;
3018  setenv_sockaddr(es, name_prefix, &si, flags);
3019  }
3020 }
3021 
3022 void
3024  const char *name_prefix,
3025  const struct link_socket_actual *act,
3026  const unsigned int flags)
3027 {
3028  setenv_sockaddr(es, name_prefix, &act->dest, flags);
3029 }
3030 
3031 /*
3032  * Convert protocol names between index and ascii form.
3033  */
3034 
3035 struct proto_names {
3036  const char *short_form;
3037  const char *display_form;
3039  int proto;
3040 };
3041 
3042 /* Indexed by PROTO_x */
3043 static const struct proto_names proto_names[] = {
3044  {"proto-uninitialized", "proto-NONE", AF_UNSPEC, PROTO_NONE},
3045  /* try IPv4 and IPv6 (client), bind dual-stack (server) */
3046  {"udp", "UDP", AF_UNSPEC, PROTO_UDP},
3047  {"tcp-server", "TCP_SERVER", AF_UNSPEC, PROTO_TCP_SERVER},
3048  {"tcp-client", "TCP_CLIENT", AF_UNSPEC, PROTO_TCP_CLIENT},
3049  {"tcp", "TCP", AF_UNSPEC, PROTO_TCP},
3050  /* force IPv4 */
3051  {"udp4", "UDPv4", AF_INET, PROTO_UDP},
3052  {"tcp4-server", "TCPv4_SERVER", AF_INET, PROTO_TCP_SERVER},
3053  {"tcp4-client", "TCPv4_CLIENT", AF_INET, PROTO_TCP_CLIENT},
3054  {"tcp4", "TCPv4", AF_INET, PROTO_TCP},
3055  /* force IPv6 */
3056  {"udp6", "UDPv6", AF_INET6, PROTO_UDP},
3057  {"tcp6-server", "TCPv6_SERVER", AF_INET6, PROTO_TCP_SERVER},
3058  {"tcp6-client", "TCPv6_CLIENT", AF_INET6, PROTO_TCP_CLIENT},
3059  {"tcp6", "TCPv6", AF_INET6, PROTO_TCP},
3060 };
3061 
3062 int
3063 ascii2proto(const char *proto_name)
3064 {
3065  int i;
3066  for (i = 0; i < SIZE(proto_names); ++i)
3067  {
3068  if (!strcmp(proto_name, proto_names[i].short_form))
3069  {
3070  return proto_names[i].proto;
3071  }
3072  }
3073  return -1;
3074 }
3075 
3077 ascii2af(const char *proto_name)
3078 {
3079  int i;
3080  for (i = 0; i < SIZE(proto_names); ++i)
3081  {
3082  if (!strcmp(proto_name, proto_names[i].short_form))
3083  {
3084  return proto_names[i].proto_af;
3085  }
3086  }
3087  return 0;
3088 }
3089 
3090 const char *
3092 {
3093  unsigned int i;
3094  for (i = 0; i < SIZE(proto_names); ++i)
3095  {
3096  if (proto_names[i].proto_af == af && proto_names[i].proto == proto)
3097  {
3098  if (display_form)
3099  {
3100  return proto_names[i].display_form;
3101  }
3102  else
3103  {
3104  return proto_names[i].short_form;
3105  }
3106  }
3107  }
3108 
3109  return "[unknown protocol]";
3110 }
3111 
3112 const char *
3114 {
3115  struct buffer out = alloc_buf_gc(256, gc);
3116  int i;
3117 
3118  for (i = 0; i < SIZE(proto_names); ++i)
3119  {
3120  if (i)
3121  {
3122  buf_printf(&out, " ");
3123  }
3124  buf_printf(&out, "[%s]", proto_names[i].short_form);
3125  }
3126  return BSTR(&out);
3127 }
3128 
3129 const char *
3131 {
3132  switch (af)
3133  {
3134  case AF_INET: return "AF_INET";
3135 
3136  case AF_INET6: return "AF_INET6";
3137  }
3138  return "AF_UNSPEC";
3139 }
3140 
3141 /*
3142  * Given a local proto, return local proto
3143  * if !remote, or compatible remote proto
3144  * if remote.
3145  *
3146  * This is used for options compatibility
3147  * checking.
3148  *
3149  * IPv6 and IPv4 protocols are comptabile but OpenVPN
3150  * has always sent UDPv4, TCPv4 over the wire. Keep these
3151  * strings for backward compatibility
3152  */
3153 const char *
3154 proto_remote(int proto, bool remote)
3155 {
3156  ASSERT(proto >= 0 && proto < PROTO_N);
3157  if (proto == PROTO_UDP)
3158  {
3159  return "UDPv4";
3160  }
3161 
3162  if ( (remote && proto == PROTO_TCP_CLIENT)
3163  || (!remote && proto == PROTO_TCP_SERVER))
3164  {
3165  return "TCPv4_SERVER";
3166  }
3167  if ( (remote && proto == PROTO_TCP_SERVER)
3168  || (!remote && proto == PROTO_TCP_CLIENT))
3169  {
3170  return "TCPv4_CLIENT";
3171  }
3172 
3173  ASSERT(0);
3174  return ""; /* Make the compiler happy */
3175 }
3176 
3177 /*
3178  * Bad incoming address lengths that differ from what
3179  * we expect are considered to be fatal errors.
3180  */
3181 void
3182 bad_address_length(int actual, int expected)
3183 {
3184  msg(M_FATAL, "ERROR: received strange incoming packet with an address length of %d -- we only accept address lengths of %d.",
3185  actual,
3186  expected);
3187 }
3188 
3189 /*
3190  * Socket Read Routines
3191  */
3192 
3193 int
3195  struct buffer *buf)
3196 {
3197  int len = 0;
3198 
3199  if (!sock->stream_buf.residual_fully_formed)
3200  {
3201 #ifdef _WIN32
3202  len = socket_finalize(sock->sd, &sock->reads, buf, NULL);
3203 #else
3204  struct buffer frag;
3205  stream_buf_get_next(&sock->stream_buf, &frag);
3206  len = recv(sock->sd, BPTR(&frag), BLEN(&frag), MSG_NOSIGNAL);
3207 #endif
3208 
3209  if (!len)
3210  {
3211  sock->stream_reset = true;
3212  }
3213  if (len <= 0)
3214  {
3215  return buf->len = len;
3216  }
3217  }
3218 
3220  || stream_buf_added(&sock->stream_buf, len)) /* packet complete? */
3221  {
3222  stream_buf_get_final(&sock->stream_buf, buf);
3223  stream_buf_reset(&sock->stream_buf);
3224  return buf->len;
3225  }
3226  else
3227  {
3228  return buf->len = 0; /* no error, but packet is still incomplete */
3229  }
3230 }
3231 
3232 #ifndef _WIN32
3233 
3234 #if ENABLE_IP_PKTINFO
3235 
3236 /* make the buffer large enough to handle ancillary socket data for
3237  * both IPv4 and IPv6 destination addresses, plus padding (see RFC 2292)
3238  */
3239 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3240 #define PKTINFO_BUF_SIZE max_int( CMSG_SPACE(sizeof(struct in6_pktinfo)), \
3241  CMSG_SPACE(sizeof(struct in_pktinfo)) )
3242 #else
3243 #define PKTINFO_BUF_SIZE max_int( CMSG_SPACE(sizeof(struct in6_pktinfo)), \
3244  CMSG_SPACE(sizeof(struct in_addr)) )
3245 #endif
3246 
3247 static socklen_t
3248 link_socket_read_udp_posix_recvmsg(struct link_socket *sock,
3249  struct buffer *buf,
3250  struct link_socket_actual *from)
3251 {
3252  struct iovec iov;
3253  uint8_t pktinfo_buf[PKTINFO_BUF_SIZE];
3254  struct msghdr mesg;
3255  socklen_t fromlen = sizeof(from->dest.addr);
3256 
3257  iov.iov_base = BPTR(buf);
3258  iov.iov_len = buf_forward_capacity_total(buf);
3259  mesg.msg_iov = &iov;
3260  mesg.msg_iovlen = 1;
3261  mesg.msg_name = &from->dest.addr;
3262  mesg.msg_namelen = fromlen;
3263  mesg.msg_control = pktinfo_buf;
3264  mesg.msg_controllen = sizeof pktinfo_buf;
3265  buf->len = recvmsg(sock->sd, &mesg, 0);
3266  if (buf->len >= 0)
3267  {
3268  struct cmsghdr *cmsg;
3269  fromlen = mesg.msg_namelen;
3270  cmsg = CMSG_FIRSTHDR(&mesg);
3271  if (cmsg != NULL
3272  && CMSG_NXTHDR(&mesg, cmsg) == NULL
3273 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3274  && cmsg->cmsg_level == SOL_IP
3275  && cmsg->cmsg_type == IP_PKTINFO
3276  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in_pktinfo)) )
3277 #elif defined(IP_RECVDSTADDR)
3278  && cmsg->cmsg_level == IPPROTO_IP
3279  && cmsg->cmsg_type == IP_RECVDSTADDR
3280  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in_addr)) )
3281 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3282 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3283 #endif
3284  {
3285 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3286  struct in_pktinfo *pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
3287  from->pi.in4.ipi_ifindex = pkti->ipi_ifindex;
3288  from->pi.in4.ipi_spec_dst = pkti->ipi_spec_dst;
3289 #elif defined(IP_RECVDSTADDR)
3290  from->pi.in4 = *(struct in_addr *) CMSG_DATA(cmsg);
3291 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3292 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3293 #endif
3294  }
3295  else if (cmsg != NULL
3296  && CMSG_NXTHDR(&mesg, cmsg) == NULL
3297  && cmsg->cmsg_level == IPPROTO_IPV6
3298  && cmsg->cmsg_type == IPV6_PKTINFO
3299  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in6_pktinfo)) )
3300  {
3301  struct in6_pktinfo *pkti6 = (struct in6_pktinfo *) CMSG_DATA(cmsg);
3302  from->pi.in6.ipi6_ifindex = pkti6->ipi6_ifindex;
3303  from->pi.in6.ipi6_addr = pkti6->ipi6_addr;
3304  }
3305  else if (cmsg != NULL)
3306  {
3307  msg(M_WARN, "CMSG received that cannot be parsed (cmsg_level=%d, cmsg_type=%d, cmsg=len=%d)", (int)cmsg->cmsg_level, (int)cmsg->cmsg_type, (int)cmsg->cmsg_len );
3308  }
3309  }
3310 
3311  return fromlen;
3312 }
3313 #endif /* if ENABLE_IP_PKTINFO */
3314 
3315 int
3316 link_socket_read_udp_posix(struct link_socket *sock,
3317  struct buffer *buf,
3318  struct link_socket_actual *from)
3319 {
3320  socklen_t fromlen = sizeof(from->dest.addr);
3321  socklen_t expectedlen = af_addr_size(sock->info.af);
3322  addr_zero_host(&from->dest);
3323 #if ENABLE_IP_PKTINFO
3324  /* Both PROTO_UDPv4 and PROTO_UDPv6 */
3325  if (sock->info.proto == PROTO_UDP && sock->sockflags & SF_USE_IP_PKTINFO)
3326  {
3327  fromlen = link_socket_read_udp_posix_recvmsg(sock, buf, from);
3328  }
3329  else
3330 #endif
3331  buf->len = recvfrom(sock->sd, BPTR(buf), buf_forward_capacity(buf), 0,
3332  &from->dest.addr.sa, &fromlen);
3333  /* FIXME: won't do anything when sock->info.af == AF_UNSPEC */
3334  if (buf->len >= 0 && expectedlen && fromlen != expectedlen)
3335  {
3336  bad_address_length(fromlen, expectedlen);
3337  }
3338  return buf->len;
3339 }
3340 
3341 #endif /* ifndef _WIN32 */
3342 
3343 /*
3344  * Socket Write Routines
3345  */
3346 
3347 int
3349  struct buffer *buf,
3350  struct link_socket_actual *to)
3351 {
3352  packet_size_type len = BLEN(buf);
3353  dmsg(D_STREAM_DEBUG, "STREAM: WRITE %d offset=%d", (int)len, buf->offset);
3354  ASSERT(len <= sock->stream_buf.maxlen);
3355  len = htonps(len);
3356  ASSERT(buf_write_prepend(buf, &len, sizeof(len)));
3357 #ifdef _WIN32
3358  return link_socket_write_win32(sock, buf, to);
3359 #else
3360  return link_socket_write_tcp_posix(sock, buf, to);
3361 #endif
3362 }
3363 
3364 #if ENABLE_IP_PKTINFO
3365 
3366 size_t
3367 link_socket_write_udp_posix_sendmsg(struct link_socket *sock,
3368  struct buffer *buf,
3369  struct link_socket_actual *to)
3370 {
3371  struct iovec iov;
3372  struct msghdr mesg;
3373  struct cmsghdr *cmsg;
3374  uint8_t pktinfo_buf[PKTINFO_BUF_SIZE];
3375 
3376  iov.iov_base = BPTR(buf);
3377  iov.iov_len = BLEN(buf);
3378  mesg.msg_iov = &iov;
3379  mesg.msg_iovlen = 1;
3380  switch (to->dest.addr.sa.sa_family)
3381  {
3382  case AF_INET:
3383  {
3384  mesg.msg_name = &to->dest.addr.sa;
3385  mesg.msg_namelen = sizeof(struct sockaddr_in);
3386  mesg.msg_control = pktinfo_buf;
3387  mesg.msg_flags = 0;
3388 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3389  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo));
3390  cmsg = CMSG_FIRSTHDR(&mesg);
3391  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
3392  cmsg->cmsg_level = SOL_IP;
3393  cmsg->cmsg_type = IP_PKTINFO;
3394  {
3395  struct in_pktinfo *pkti;
3396  pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
3397  pkti->ipi_ifindex = to->pi.in4.ipi_ifindex;
3398  pkti->ipi_spec_dst = to->pi.in4.ipi_spec_dst;
3399  pkti->ipi_addr.s_addr = 0;
3400  }
3401 #elif defined(IP_RECVDSTADDR)
3402  ASSERT( CMSG_SPACE(sizeof(struct in_addr)) <= sizeof(pktinfo_buf) );
3403  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr));
3404  cmsg = CMSG_FIRSTHDR(&mesg);
3405  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
3406  cmsg->cmsg_level = IPPROTO_IP;
3407  cmsg->cmsg_type = IP_RECVDSTADDR;
3408  *(struct in_addr *) CMSG_DATA(cmsg) = to->pi.in4;
3409 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3410 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3411 #endif /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3412  break;
3413  }
3414 
3415  case AF_INET6:
3416  {
3417  struct in6_pktinfo *pkti6;
3418  mesg.msg_name = &to->dest.addr.sa;
3419  mesg.msg_namelen = sizeof(struct sockaddr_in6);
3420 
3421  ASSERT( CMSG_SPACE(sizeof(struct in6_pktinfo)) <= sizeof(pktinfo_buf) );
3422  mesg.msg_control = pktinfo_buf;
3423  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
3424  mesg.msg_flags = 0;
3425  cmsg = CMSG_FIRSTHDR(&mesg);
3426  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
3427  cmsg->cmsg_level = IPPROTO_IPV6;
3428  cmsg->cmsg_type = IPV6_PKTINFO;
3429 
3430  pkti6 = (struct in6_pktinfo *) CMSG_DATA(cmsg);
3431  pkti6->ipi6_ifindex = to->pi.in6.ipi6_ifindex;
3432  pkti6->ipi6_addr = to->pi.in6.ipi6_addr;
3433  break;
3434  }
3435 
3436  default: ASSERT(0);
3437  }
3438  return sendmsg(sock->sd, &mesg, 0);
3439 }
3440 
3441 #endif /* if ENABLE_IP_PKTINFO */
3442 
3443 /*
3444  * Win32 overlapped socket I/O functions.
3445  */
3446 
3447 #ifdef _WIN32
3448 
3449 int
3450 socket_recv_queue(struct link_socket *sock, int maxsize)
3451 {
3452  if (sock->reads.iostate == IOSTATE_INITIAL)
3453  {
3454  WSABUF wsabuf[1];
3455  int status;
3456 
3457  /* reset buf to its initial state */
3458  if (proto_is_udp(sock->info.proto))
3459  {
3460  sock->reads.buf = sock->reads.buf_init;
3461  }
3462  else if (proto_is_tcp(sock->info.proto))
3463  {
3464  stream_buf_get_next(&sock->stream_buf, &sock->reads.buf);
3465  }
3466  else
3467  {
3468  ASSERT(0);
3469  }
3470 
3471  /* Win32 docs say it's okay to allocate the wsabuf on the stack */
3472  wsabuf[0].buf = BSTR(&sock->reads.buf);
3473  wsabuf[0].len = maxsize ? maxsize : BLEN(&sock->reads.buf);
3474 
3475  /* check for buffer overflow */
3476  ASSERT(wsabuf[0].len <= BLEN(&sock->reads.buf));
3477 
3478  /* the overlapped read will signal this event on I/O completion */
3479  ASSERT(ResetEvent(sock->reads.overlapped.hEvent));
3480  sock->reads.flags = 0;
3481 
3482  if (proto_is_udp(sock->info.proto))
3483  {
3484  sock->reads.addr_defined = true;
3485  sock->reads.addrlen = sizeof(sock->reads.addr6);
3486  status = WSARecvFrom(
3487  sock->sd,
3488  wsabuf,
3489  1,
3490  &sock->reads.size,
3491  &sock->reads.flags,
3492  (struct sockaddr *) &sock->reads.addr,
3493  &sock->reads.addrlen,
3494  &sock->reads.overlapped,
3495  NULL);
3496  }
3497  else if (proto_is_tcp(sock->info.proto))
3498  {
3499  sock->reads.addr_defined = false;
3500  status = WSARecv(
3501  sock->sd,
3502  wsabuf,
3503  1,
3504  &sock->reads.size,
3505  &sock->reads.flags,
3506  &sock->reads.overlapped,
3507  NULL);
3508  }
3509  else
3510  {
3511  status = 0;
3512  ASSERT(0);
3513  }
3514 
3515  if (!status) /* operation completed immediately? */
3516  {
3517  /* FIXME: won't do anything when sock->info.af == AF_UNSPEC */
3518  int af_len = af_addr_size(sock->info.af);
3519  if (sock->reads.addr_defined && af_len && sock->reads.addrlen != af_len)
3520  {
3521  bad_address_length(sock->reads.addrlen, af_len);
3522  }
3524 
3525  /* since we got an immediate return, we must signal the event object ourselves */
3526  ASSERT(SetEvent(sock->reads.overlapped.hEvent));
3527  sock->reads.status = 0;
3528 
3529  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive immediate return [%d,%d]",
3530  (int) wsabuf[0].len,
3531  (int) sock->reads.size);
3532  }
3533  else
3534  {
3535  status = WSAGetLastError();
3536  if (status == WSA_IO_PENDING) /* operation queued? */
3537  {
3538  sock->reads.iostate = IOSTATE_QUEUED;
3539  sock->reads.status = status;
3540  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive queued [%d]",
3541  (int) wsabuf[0].len);
3542  }
3543  else /* error occurred */
3544  {
3545  struct gc_arena gc = gc_new();
3546  ASSERT(SetEvent(sock->reads.overlapped.hEvent));
3548  sock->reads.status = status;
3549  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive error [%d]: %s",
3550  (int) wsabuf[0].len,
3551  strerror_win32(status, &gc));
3552  gc_free(&gc);
3553  }
3554  }
3555  }
3556  return sock->reads.iostate;
3557 }
3558 
3559 int
3560 socket_send_queue(struct link_socket *sock, struct buffer *buf, const struct link_socket_actual *to)
3561 {
3562  if (sock->writes.iostate == IOSTATE_INITIAL)
3563  {
3564  WSABUF wsabuf[1];
3565  int status;
3566 
3567  /* make a private copy of buf */
3568  sock->writes.buf = sock->writes.buf_init;
3569  sock->writes.buf.len = 0;
3570  ASSERT(buf_copy(&sock->writes.buf, buf));
3571 
3572  /* Win32 docs say it's okay to allocate the wsabuf on the stack */
3573  wsabuf[0].buf = BSTR(&sock->writes.buf);
3574  wsabuf[0].len = BLEN(&sock->writes.buf);
3575 
3576  /* the overlapped write will signal this event on I/O completion */
3577  ASSERT(ResetEvent(sock->writes.overlapped.hEvent));
3578  sock->writes.flags = 0;
3579 
3580  if (proto_is_udp(sock->info.proto))
3581  {
3582  /* set destination address for UDP writes */
3583  sock->writes.addr_defined = true;
3584  if (to->dest.addr.sa.sa_family == AF_INET6)
3585  {
3586  sock->writes.addr6 = to->dest.addr.in6;
3587  sock->writes.addrlen = sizeof(sock->writes.addr6);
3588  }
3589  else
3590  {
3591  sock->writes.addr = to->dest.addr.in4;
3592  sock->writes.addrlen = sizeof(sock->writes.addr);
3593  }
3594 
3595  status = WSASendTo(
3596  sock->sd,
3597  wsabuf,
3598  1,
3599  &sock->writes.size,
3600  sock->writes.flags,
3601  (struct sockaddr *) &sock->writes.addr,
3602  sock->writes.addrlen,
3603  &sock->writes.overlapped,
3604  NULL);
3605  }
3606  else if (proto_is_tcp(sock->info.proto))
3607  {
3608  /* destination address for TCP writes was established on connection initiation */
3609  sock->writes.addr_defined = false;
3610 
3611  status = WSASend(
3612  sock->sd,
3613  wsabuf,
3614  1,
3615  &sock->writes.size,
3616  sock->writes.flags,
3617  &sock->writes.overlapped,
3618  NULL);
3619  }
3620  else
3621  {
3622  status = 0;
3623  ASSERT(0);
3624  }
3625 
3626  if (!status) /* operation completed immediately? */
3627  {
3629 
3630  /* since we got an immediate return, we must signal the event object ourselves */
3631  ASSERT(SetEvent(sock->writes.overlapped.hEvent));
3632 
3633  sock->writes.status = 0;
3634 
3635  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send immediate return [%d,%d]",
3636  (int) wsabuf[0].len,
3637  (int) sock->writes.size);
3638  }
3639  else
3640  {
3641  status = WSAGetLastError();
3642  if (status == WSA_IO_PENDING) /* operation queued? */
3643  {
3644  sock->writes.iostate = IOSTATE_QUEUED;
3645  sock->writes.status = status;
3646  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send queued [%d]",
3647  (int) wsabuf[0].len);
3648  }
3649  else /* error occurred */
3650  {
3651  struct gc_arena gc = gc_new();
3652  ASSERT(SetEvent(sock->writes.overlapped.hEvent));
3654  sock->writes.status = status;
3655 
3656  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send error [%d]: %s",
3657  (int) wsabuf[0].len,
3658  strerror_win32(status, &gc));
3659 
3660  gc_free(&gc);
3661  }
3662  }
3663  }
3664  return sock->writes.iostate;
3665 }
3666 
3667 int
3669  struct overlapped_io *io,
3670  struct buffer *buf,
3671  struct link_socket_actual *from)
3672 {
3673  int ret = -1;
3674  BOOL status;
3675 
3676  switch (io->iostate)
3677  {
3678  case IOSTATE_QUEUED:
3679  status = WSAGetOverlappedResult(
3680  s,
3681  &io->overlapped,
3682  &io->size,
3683  FALSE,
3684  &io->flags
3685  );
3686  if (status)
3687  {
3688  /* successful return for a queued operation */
3689  if (buf)
3690  {
3691  *buf = io->buf;
3692  }
3693  ret = io->size;
3694  io->iostate = IOSTATE_INITIAL;
3695  ASSERT(ResetEvent(io->overlapped.hEvent));
3696 
3697  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion success [%d]", ret);
3698  }
3699  else
3700  {
3701  /* error during a queued operation */
3702  ret = -1;
3703  if (WSAGetLastError() != WSA_IO_INCOMPLETE)
3704  {
3705  /* if no error (i.e. just not finished yet), then DON'T execute this code */
3706  io->iostate = IOSTATE_INITIAL;
3707  ASSERT(ResetEvent(io->overlapped.hEvent));
3708  msg(D_WIN32_IO | M_ERRNO, "WIN32 I/O: Socket Completion error");
3709  }
3710  }
3711  break;
3712 
3714  io->iostate = IOSTATE_INITIAL;
3715  ASSERT(ResetEvent(io->overlapped.hEvent));
3716  if (io->status)
3717  {
3718  /* error return for a non-queued operation */
3719  WSASetLastError(io->status);
3720  ret = -1;
3721  msg(D_WIN32_IO | M_ERRNO, "WIN32 I/O: Socket Completion non-queued error");
3722  }
3723  else
3724  {
3725  /* successful return for a non-queued operation */
3726  if (buf)
3727  {
3728  *buf = io->buf;
3729  }
3730  ret = io->size;
3731  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion non-queued success [%d]", ret);
3732  }
3733  break;
3734 
3735  case IOSTATE_INITIAL: /* were we called without proper queueing? */
3736  WSASetLastError(WSAEINVAL);
3737  ret = -1;
3738  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion BAD STATE");
3739  break;
3740 
3741  default:
3742  ASSERT(0);
3743  }
3744 
3745  /* return from address if requested */
3746  if (from)
3747  {
3748  if (ret >= 0 && io->addr_defined)
3749  {
3750  /* TODO(jjo): streamline this mess */
3751  /* in this func we don't have relevant info about the PF_ of this
3752  * endpoint, as link_socket_actual will be zero for the 1st received packet
3753  *
3754  * Test for inets PF_ possible sizes
3755  */
3756  switch (io->addrlen)
3757  {
3758  case sizeof(struct sockaddr_in):
3759  case sizeof(struct sockaddr_in6):
3760  /* TODO(jjo): for some reason (?) I'm getting 24,28 for AF_INET6
3761  * under _WIN32*/
3762  case sizeof(struct sockaddr_in6)-4:
3763  break;
3764 
3765  default:
3766  bad_address_length(io->addrlen, af_addr_size(io->addr.sin_family));
3767  }
3768 
3769  switch (io->addr.sin_family)
3770  {
3771  case AF_INET:
3772  from->dest.addr.in4 = io->addr;
3773  break;
3774 
3775  case AF_INET6:
3776  from->dest.addr.in6 = io->addr6;
3777  break;
3778  }
3779  }
3780  else
3781  {
3782  CLEAR(from->dest.addr);
3783  }
3784  }
3785 
3786  if (buf)
3787  {
3788  buf->len = ret;
3789  }
3790  return ret;
3791 }
3792 
3793 #endif /* _WIN32 */
3794 
3795 /*
3796  * Socket event notification
3797  */
3798 
3799 unsigned int
3801  struct event_set *es,
3802  unsigned int rwflags,
3803  void *arg,
3804  unsigned int *persistent)
3805 {
3806  if (s)
3807  {
3808  if ((rwflags & EVENT_READ) && !stream_buf_read_setup(s))
3809  {
3810  ASSERT(!persistent);
3811  rwflags &= ~EVENT_READ;
3812  }
3813 
3814 #ifdef _WIN32
3815  if (rwflags & EVENT_READ)
3816  {
3817  socket_recv_queue(s, 0);
3818  }
3819 #endif
3820 
3821  /* if persistent is defined, call event_ctl only if rwflags has changed since last call */
3822  if (!persistent || *persistent != rwflags)
3823  {
3824  event_ctl(es, socket_event_handle(s), rwflags, arg);
3825  if (persistent)
3826  {
3827  *persistent = rwflags;
3828  }
3829  }
3830 
3831  s->rwflags_debug = rwflags;
3832  }
3833  return rwflags;
3834 }
3835 
3836 void
3838 {
3839  if (sd && socket_defined(*sd))
3840  {
3841  openvpn_close_socket(*sd);
3842  *sd = SOCKET_UNDEFINED;
3843  }
3844 }
3845 
3846 #if UNIX_SOCK_SUPPORT
3847 
3848 /*
3849  * code for unix domain sockets
3850  */
3851 
3852 const char *
3853 sockaddr_unix_name(const struct sockaddr_un *local, const char *null)
3854 {
3855  if (local && local->sun_family == PF_UNIX)
3856  {
3857  return local->sun_path;
3858  }
3859  else
3860  {
3861  return null;
3862  }
3863 }
3864 
3866 create_socket_unix(void)
3867 {
3869 
3870  if ((sd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
3871  {
3872  msg(M_ERR, "Cannot create unix domain socket");
3873  }
3874 
3875  /* set socket file descriptor to not pass across execs, so that
3876  * scripts don't have access to it */
3877  set_cloexec(sd);
3878 
3879  return sd;
3880 }
3881 
3882 void
3883 socket_bind_unix(socket_descriptor_t sd,
3884  struct sockaddr_un *local,
3885  const char *prefix)
3886 {
3887  struct gc_arena gc = gc_new();
3888  const mode_t orig_umask = umask(0);
3889 
3890  if (bind(sd, (struct sockaddr *) local, sizeof(struct sockaddr_un)))
3891  {
3892  msg(M_FATAL | M_ERRNO,
3893  "%s: Socket bind[%d] failed on unix domain socket %s",
3894  prefix,
3895  (int)sd,
3896  sockaddr_unix_name(local, "NULL"));
3897  }
3898 
3899  umask(orig_umask);
3900  gc_free(&gc);
3901 }
3902 
3904 socket_accept_unix(socket_descriptor_t sd,
3905  struct sockaddr_un *remote)
3906 {
3907  socklen_t remote_len = sizeof(struct sockaddr_un);
3908  socket_descriptor_t ret;
3909 
3910  CLEAR(*remote);
3911  ret = accept(sd, (struct sockaddr *) remote, &remote_len);
3912  if (ret >= 0)
3913  {
3914  /* set socket file descriptor to not pass across execs, so that
3915  * scripts don't have access to it */
3916  set_cloexec(ret);
3917  }
3918  return ret;
3919 }
3920 
3921 int
3922 socket_connect_unix(socket_descriptor_t sd,
3923  struct sockaddr_un *remote)
3924 {
3925  int status = connect(sd, (struct sockaddr *) remote, sizeof(struct sockaddr_un));
3926  if (status)
3927  {
3928  status = openvpn_errno();
3929  }
3930  return status;
3931 }
3932 
3933 void
3934 sockaddr_unix_init(struct sockaddr_un *local, const char *path)
3935 {
3936  local->sun_family = PF_UNIX;
3937  strncpynt(local->sun_path, path, sizeof(local->sun_path));
3938 }
3939 
3940 void
3941 socket_delete_unix(const struct sockaddr_un *local)
3942 {
3943  const char *name = sockaddr_unix_name(local, NULL);
3944  if (name && strlen(name))
3945  {
3946  unlink(name);
3947  }
3948 }
3949 
3950 bool
3951 unix_socket_get_peer_uid_gid(const socket_descriptor_t sd, int *uid, int *gid)
3952 {
3953 #ifdef HAVE_GETPEEREID
3954  uid_t u;
3955  gid_t g;
3956  if (getpeereid(sd, &u, &g) == -1)
3957  {
3958  return false;
3959  }
3960  if (uid)
3961  {
3962  *uid = u;
3963  }
3964  if (gid)
3965  {
3966  *gid = g;
3967  }
3968  return true;
3969 #elif defined(SO_PEERCRED)
3970  struct ucred peercred;
3971  socklen_t so_len = sizeof(peercred);
3972  if (getsockopt(sd, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) == -1)
3973  {
3974  return false;
3975  }
3976  if (uid)
3977  {
3978  *uid = peercred.uid;
3979  }
3980  if (gid)
3981  {
3982  *gid = peercred.gid;
3983  }
3984  return true;
3985 #else /* ifdef HAVE_GETPEEREID */
3986  return false;
3987 #endif /* ifdef HAVE_GETPEEREID */
3988 }
3989 
3990 #endif /* if UNIX_SOCK_SUPPORT */
#define M_NONFATAL
Definition: error.h:99
int status
Definition: win32.h:207
bool string_class(const char *str, const unsigned int inclusive, const unsigned int exclusive)
Definition: buffer.c:1058
bool remote_float
Definition: options.h:105
bool argv_printf_cat(struct argv *argres, const char *format,...)
printf() inspired argv concatenation.
Definition: argv.c:466
#define OPENVPN_STATE_RESOLVE
Definition: manage.h:480
int sndbuf
Definition: options.h:366
#define PS_SHOW_PORT_IF_DEFINED
Definition: socket.h:309
#define CC_ALNUM
Definition: buffer.h:910
static void strncpynt(char *dest, const char *src, size_t maxlen)
Definition: buffer.h:348
const char * socks_proxy_port
Definition: options.h:114
struct buffer buf_init
Definition: win32.h:214
#define MSG_NOSIGNAL
Definition: socket.h:252
static void socket_set_buffers(socket_descriptor_t fd, const struct socket_buffer_size *sbs)
Definition: socket.c:907
bool error
Definition: socket.h:140
#define D_INIT_MEDIUM
Definition: errlevel.h:104
int openvpn_getaddrinfo(unsigned int flags, const char *hostname, const char *servname, int resolve_retry_seconds, volatile int *signal_received, int ai_family, struct addrinfo **res)
Definition: socket.c:442
#define GETADDR_WARN_ON_SIGNAL
Definition: socket.h:476
struct options options
Options loaded from command line or configuration file.
Definition: openvpn.h:463
#define D_OSBUF
Definition: errlevel.h:91
void free_buf(struct buffer *buf)
Definition: buffer.c:185
HANDLE read
Definition: win32.h:77
struct link_socket * link_socket_new(void)
Definition: socket.c:1840
void init_net_event_win32(struct rw_handle *event, long network_events, socket_descriptor_t sd, unsigned int flags)
Definition: win32.c:219
struct sockaddr_in6 addr6
Definition: win32.h:211
void setenv_trusted(struct env_set *es, const struct link_socket_info *info)
Definition: socket.c:2321
struct argv argv_new(void)
Allocates a new struct argv and ensures it is initialised.
Definition: argv.c:90
#define openvpn_errno()
Definition: error.h:78
struct cached_dns_entry * dns_cache
Definition: openvpn.h:162
int len
Definition: socket.h:138
#define streq(x, y)
Definition: options.h:667
void establish_socks_proxy_passthru(struct socks_proxy_info *p, socket_descriptor_t sd, const char *host, const char *servname, volatile int *signal_received)
Definition: socks.c:456
in_addr_t getaddr(unsigned int flags, const char *hostname, int resolve_retry_seconds, bool *succeeded, volatile int *signal_received)
Translate an IPv4 addr or hostname from string form to in_addr_t.
Definition: socket.c:193
#define GETADDR_TRY_ONCE
Definition: socket.h:478
sa_family_t ascii2af(const char *proto_name)
Definition: socket.c:3077
const char * print_in6_addr(struct in6_addr a6, unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2896
#define M_INFO
Definition: errlevel.h:55
Contains all state information for one tunnel.
Definition: openvpn.h:461
Packet geometry parameters.
Definition: mtu.h:93
static bool streqnull(const char *a, const char *b)
Definition: socket.c:237
void overlapped_io_init(struct overlapped_io *o, const struct frame *frame, BOOL event_state, bool tuntap_buffer)
Definition: win32.c:166
#define IPv6_UDP_HEADER_SIZE
Definition: socket.h:584
static int af_addr_size(sa_family_t af)
Definition: socket.h:853
#define SA_IP_PORT
Definition: socket.h:365
void throw_signal_soft(const int signum, const char *signal_text)
Definition: sig.c:111
static socket_descriptor_t socket_listen_accept(socket_descriptor_t sd, struct link_socket_actual *act, const char *remote_dynamic, const struct addrinfo *local, bool do_listen, bool nowait, volatile int *signal_received)
Definition: socket.c:1289
DWORD size
Definition: win32.h:205
const char * print_link_socket_actual(const struct link_socket_actual *act, struct gc_arena *gc)
Definition: socket.c:2795
static void gc_free(struct gc_arena *a)
Definition: buffer.h:1023
OVERLAPPED overlapped
Definition: win32.h:204
static void frame_add_to_extra_frame(struct frame *frame, const unsigned int increment)
Definition: mtu.h:274
static int plugin_call(const struct plugin_list *pl, const int type, const struct argv *av, struct plugin_return *pr, struct env_set *es)
Definition: plugin.h:202
#define M_MSG_VIRT_OUT
Definition: error.h:108
#define IPv6_TCP_HEADER_SIZE
Definition: socket.h:585
static int link_socket_write_win32(struct link_socket *sock, struct buffer *buf, struct link_socket_actual *to)
Definition: socket.h:1075
#define OIA_HOSTNAME
Definition: socket.h:423
struct man_connection connection
Definition: manage.h:316
unsigned short sa_family_t
Definition: syshead.h:402
Definition: options.h:96
#define SIGUSR1
Definition: config-msvc.h:115
static bool socket_set_tcp_nodelay(socket_descriptor_t sd, int state)
Definition: socket.c:937
#define SET_MTU_UPPER_BOUND
Definition: mtu.h:221
#define CC_DIGIT
Definition: buffer.h:914
struct buffer alloc_buf(size_t size)
Definition: buffer.c:64
static bool proto_is_dgram(int proto)
Return if the protocol is datagram (UDP)
Definition: socket.h:551
static void stream_buf_get_final(struct stream_buf *sb, struct buffer *buf)
Definition: socket.c:2580
int rcvbuf
Definition: options.h:365
struct buffer buf_init
Definition: socket.h:131
struct connection_list * connection_list
Definition: options.h:253
int openvpn_inet_aton(const char *dotted_quad, struct in_addr *addr)
Definition: socket.c:675
#define LS_MODE_DEFAULT
Definition: socket.h:191
static bool proto_is_udp(int proto)
Returns if the protocol being used is UDP.
Definition: socket.h:540
const struct link_socket * accept_from
Definition: openvpn.h:242
unsigned int sockflags
Definition: options.h:373
bool buf_printf(struct buffer *buf, const char *format,...)
Definition: buffer.c:242
const char * proto2ascii_all(struct gc_arena *gc)
Definition: socket.c:3113
int resolve_retry_seconds
Definition: options.h:317
#define SF_TCP_NODELAY
Definition: socket.h:204
const int proto_overhead[]
Definition: socket.c:47
void setenv_str(struct env_set *es, const char *name, const char *value)
Definition: env_set.c:285
struct link_socket_addr link_socket_addr
Local and remote addresses on the external network.
Definition: openvpn.h:154
#define SF_GETADDRINFO_DGRAM
Definition: socket.h:207
#define OPENVPN_STATE_TCP_CONNECT
Definition: manage.h:481
#define SIZE(x)
Definition: basic.h:30
#define D_READ_WRITE
Definition: errlevel.h:161
struct socks_proxy_info * socks_proxy
Definition: openvpn.h:188
#define in_addr_t
Definition: config-msvc.h:103
const char * hostname_randomize(const char *hostname, struct gc_arena *gc)
Definition: misc.c:84
static void tcp_connection_established(const struct link_socket_actual *act)
Definition: socket.c:1280
#define dmsg(flags,...)
Definition: error.h:157
struct signal_info * sig
Internal error signaling object.
Definition: openvpn.h:488
const char * port
Definition: proxy.h:46
const char * local_port
Definition: options.h:100
struct cached_dns_entry * next
Definition: socket.h:81
struct sockaddr_in addr
Definition: win32.h:210
bool link_socket_update_flags(struct link_socket *ls, unsigned int sockflags)
Definition: socket.c:981
static int socket_get_rcvbuf(socket_descriptor_t sd)
Definition: socket.c:877
#define SIGTERM
Definition: config-msvc.h:117
#define D_RESOLVE_ERRORS
Definition: errlevel.h:60
static void get_signal(volatile int *sig)
Definition: sig.h:89
#define SIGHUP
Definition: config-msvc.h:113
#define ASSERT(x)
Definition: error.h:204
struct buffer residual
Definition: socket.h:132
const char * display_form
Definition: socket.c:3037
#define IA_NET_ORDER
Definition: socket.h:358
#define GETADDR_MENTION_RESOLVE_RETRY
Definition: socket.h:474
#define OPENVPN_PLUGIN_FUNC_SUCCESS
Definition: socket.h:75
#define CC_DOT
Definition: buffer.h:927
static bool link_socket_connection_oriented(const struct link_socket *sock)
Definition: socket.h:607
#define D_LOW
Definition: errlevel.h:97
int ascii2proto(const char *proto_name)
Definition: socket.c:3063
#define GETADDR_RANDOMIZE
Definition: socket.h:480
void close_net_event_win32(struct rw_handle *event, socket_descriptor_t sd, unsigned int flags)
Definition: win32.c:273
int proto
Definition: socket.c:3039
const char * proto_remote(int proto, bool remote)
Definition: socket.c:3154
static bool buf_read(struct buffer *src, void *dest, int size)
Definition: buffer.h:800
static event_t socket_event_handle(const struct link_socket *s)
Definition: socket.h:1211
int offset
Offset in bytes of the actual content within the allocated memory.
Definition: buffer.h:64
#define PS_SHOW_PORT
Definition: socket.h:310
static socket_descriptor_t create_socket_udp(struct addrinfo *addrinfo, const unsigned int flags)
Definition: socket.c:1042
static int get_cached_dns_entry(struct cached_dns_entry *dns_cache, const char *hostname, const char *servname, int ai_family, int resolve_flags, struct addrinfo **ai)
Definition: socket.c:258
int add(int a, int b)
struct sockaddr_in6 in6
Definition: socket.h:70
list flags
int len
Length in bytes of the actual content within the allocated memory.
Definition: buffer.h:66
#define GETADDR_DATAGRAM
Definition: socket.h:482
static void phase2_tcp_client(struct link_socket *sock, struct signal_info *sig_info)
Definition: socket.c:2063
void link_socket_bad_incoming_addr(struct buffer *buf, const struct link_socket_info *info, const struct link_socket_actual *from_addr)
Definition: socket.c:2394
#define OIA_IP
Definition: socket.h:424
#define openvpn_close_socket(s)
Definition: socket.h:257
int iostate
Definition: win32.h:203
static void socket_set_sndbuf(socket_descriptor_t sd, int size)
Definition: socket.c:866
#define LS_MODE_TCP_ACCEPT_FROM
Definition: socket.h:193
struct context_1 c1
Level 1 context.
Definition: openvpn.h:501
#define htonps(x)
Definition: socket.h:58
static void bind_local(struct link_socket *sock, const sa_family_t ai_family)
Definition: socket.c:1097
#define OPENVPN_PLUGIN_IPCHANGE
#define CLEAR(x)
Definition: basic.h:33
#define BPTR(buf)
Definition: buffer.h:124
#define IPV4_INVALID_ADDR
Definition: socket.h:392
#define IPv4_UDP_HEADER_SIZE
Definition: socket.h:582
#define OIA_ERROR
Definition: socket.h:425
#define PS_DONT_SHOW_FAMILY
Definition: socket.h:313
#define ntohps(x)
Definition: socket.h:61
static void stream_buf_close(struct stream_buf *sb)
Definition: socket.c:2685
bool openvpn_snprintf(char *str, size_t size, const char *format,...)
Definition: buffer.c:296
int socket_recv_queue(struct link_socket *sock, int maxsize)
Definition: socket.c:3450
int socket_finalize(SOCKET s, struct overlapped_io *io, struct buffer *buf, struct link_socket_actual *from)
Definition: socket.c:3668
int ai_family
Definition: socket.h:78
static void socket_connect(socket_descriptor_t *sd, const struct sockaddr *dest, const int connect_timeout, struct signal_info *sig_info)
Definition: socket.c:1555
const char * socks_proxy_server
Definition: options.h:113
#define IA_EMPTY_IF_UNDEF
Definition: socket.h:357
#define LS_MODE_TCP_LISTEN
Definition: socket.h:192
#define GETADDR_UPDATE_MANAGEMENT_STATE
Definition: socket.h:479
#define IPv4_TCP_HEADER_SIZE
Definition: socket.h:583
struct buffer next
Definition: socket.h:137
int proto
Definition: options.h:98
void setenv_link_socket_actual(struct env_set *es, const char *name_prefix, const struct link_socket_actual *act, const unsigned int flags)
Definition: socket.c:3023
void gc_addspecial(void *addr, void(*free_function)(void *), struct gc_arena *a)
Definition: buffer.c:474
bool buf_puts(struct buffer *buf, const char *str)
Definition: buffer.c:269
const char * print_link_socket_actual_ex(const struct link_socket_actual *act, const char *separator, const unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2805
int mode
Definition: options.h:224
bool ip_or_dns_addr_safe(const char *addr, const bool allow_fqdn)
Definition: socket.c:785
static struct gc_arena gc_new(void)
Definition: buffer.h:1015
#define IOSTATE_IMMEDIATE_RETURN
Definition: win32.h:202
static bool proto_is_tcp(int proto)
returns if the proto is a TCP variant (tcp-server, tcp-client or tcp)
Definition: socket.h:560
const char * hostname
Definition: socket.h:76
static const char * print_sockaddr(const struct sockaddr *addr, struct gc_arena *gc)
Definition: socket.h:340
static bool addrlist_match(const struct openvpn_sockaddr *a1, const struct addrinfo *addrlist)
Definition: socket.h:706
void link_socket_bad_outgoing_addr(void)
Definition: socket.c:2423
static bool addr_defined_ipi(const struct link_socket_actual *lsa)
Definition: socket.h:658
#define ALLOC_OBJ_CLEAR(dptr, type)
Definition: buffer.h:1050
static void ipchange_fmt(const bool include_cmd, struct argv *argv, const struct link_socket_info *info, struct gc_arena *gc)
Definition: socket.c:2327
const char * print_in_addr_t(in_addr_t addr, unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2876
int get_server_poll_remaining_time(struct event_timeout *server_poll_timeout)
Definition: forward.c:418
struct frame frame
Definition: openvpn.h:248
static bool buf_copy_excess(struct buffer *dest, struct buffer *src, int len)
Definition: buffer.h:775
struct sockaddr_in in4
Definition: socket.h:69
sa_family_t proto_af
Definition: socket.c:3038
static void stream_buf_get_next(struct stream_buf *sb, struct buffer *buf)
Definition: socket.c:2589
#define IOSTATE_QUEUED
Definition: win32.h:201
static void gc_freeaddrinfo_callback(void *addr)
Definition: buffer.h:202
static int socket_defined(const socket_descriptor_t sd)
Definition: syshead.h:452
struct http_proxy_options * http_proxy_options
Definition: options.h:112
static bool link_socket_actual_defined(const struct link_socket_actual *act)
Definition: socket.h:685
int addrlen
Definition: win32.h:213
static void openvpn_fd_set(socket_descriptor_t fd, fd_set *setp)
Definition: fdmisc.h:40
#define HAVE_IN_PKTINFO
Definition: config-msvc.h:41
void setenv_sockaddr(struct env_set *es, const char *name_prefix, const struct openvpn_sockaddr *addr, const unsigned int flags)
Definition: socket.c:2941
void overlapped_io_close(struct overlapped_io *o)
Definition: win32.c:185
bool stream_buf_read_setup_dowork(struct link_socket *sock)
Definition: socket.c:2598
static bool defined_net_event_win32(const struct rw_handle *event)
Definition: win32.h:89
static int openvpn_run_script(const struct argv *a, const struct env_set *es, const unsigned int flags, const char *hook)
Will run a script and return the exit code of the script if between 0 and 255, -1 otherwise...
Definition: run_command.h:64
static void linksock_print_addr(struct link_socket *sock)
Definition: socket.c:1980
static int buf_forward_capacity(const struct buffer *buf)
Definition: buffer.h:562
#define D_SOCKET_DEBUG
Definition: errlevel.h:136
int link_socket_write_tcp(struct link_socket *sock, struct buffer *buf, struct link_socket_actual *to)
Definition: socket.c:3348
static void event_ctl(struct event_set *es, event_t event, unsigned int rwflags, void *arg)
Definition: event.h:157
void socket_bind(socket_descriptor_t sd, struct addrinfo *local, int ai_family, const char *prefix, bool ipv6only)
Definition: socket.c:1382
const struct in6_addr * link_socket_current_remote_ipv6(const struct link_socket_info *info)
Definition: socket.c:2464
struct buffer buf
Definition: socket.h:136
union openvpn_sockaddr::@10 addr
void sd_close(socket_descriptor_t *sd)
Definition: socket.c:3837
struct link_socket * link_socket
Definition: openvpn.h:237
static bool buf_copy(struct buffer *dest, const struct buffer *src)
Definition: buffer.h:734
#define M_ERRNO
Definition: error.h:103
struct buffer buf
Definition: win32.h:215
const char * socket_stat(const struct link_socket *s, unsigned int rwflags, struct gc_arena *gc)
Definition: socket.c:2497
static bool stream_buf_added(struct stream_buf *sb, int length_added)
Definition: socket.c:2618
static void resolve_remote(struct link_socket *sock, int phase, const char **remote_dynamic, volatile int *signal_received)
Definition: socket.c:1712
#define HAVE_IPI_SPEC_DST
Definition: config.h:336
Interface functions to the internal and external multiplexers.
static void phase2_set_socket_flags(struct link_socket *sock)
Definition: socket.c:1961
static bool socket_set_flags(socket_descriptor_t sd, unsigned int sockflags)
Definition: socket.c:968
const char * remote
Definition: options.h:104
#define GETADDR_HOST_ORDER
Definition: socket.h:473
void set_mtu_discover_type(socket_descriptor_t sd, int mtu_type, sa_family_t proto_af)
Definition: mtu.c:169
static void stream_buf_reset(struct stream_buf *sb)
Definition: socket.c:2534
struct connection_entry ce
Definition: options.h:252
struct context_2 c2
Level 2 context.
Definition: openvpn.h:502
const char * server
Definition: proxy.h:45
#define SOCKET_UNDEFINED
Definition: syshead.h:444
const char * strerror_win32(DWORD errnum, struct gc_arena *gc)
Definition: error.c:802
char * overlapped_io_state_ascii(const struct overlapped_io *o)
Definition: win32.c:198
#define EVENT_READ
Definition: event.h:39
static bool stream_buf_read_setup(struct link_socket *sock)
Definition: socket.h:997
const char * ipchange
Definition: options.h:268
volatile int source
Definition: sig.h:46
#define BLEN(buf)
Definition: buffer.h:127
#define FRAME_HEADROOM_MARKER_READ_STREAM
Definition: mtu.h:132
static void socket_frame_init(const struct frame *frame, struct link_socket *sock)
Definition: socket.c:1629
const char * remote_port
Definition: options.h:102
void link_socket_init_phase1(struct context *c, int mode)
Definition: socket.c:1851
void alloc_buf_sock_tun(struct buffer *buf, const struct frame *frame, const bool tuntap_buffer, const unsigned int align_mask)
Definition: mtu.c:43
#define SA_SET_IF_NONZERO
Definition: socket.h:366
struct connection_entry * array[CONNECTION_LIST_SIZE]
Definition: options.h:173
#define msg(flags,...)
Definition: error.h:153
void set_nonblock(socket_descriptor_t fd)
Definition: fdmisc.c:71
int openvpn_connect(socket_descriptor_t sd, const struct sockaddr *remote, int connect_timeout, volatile int *signal_received)
Definition: socket.c:1436
static bool buf_defined(const struct buffer *buf)
Definition: buffer.h:215
const char * ip_remote_hint
Definition: options.h:319
#define SIG_SOURCE_CONNECTION_FAILED
Definition: sig.h:37
const char * print_sockaddr_ex(const struct sockaddr *sa, const char *separator, const unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2714
HANDLE write
Definition: win32.h:78
const char * local
Definition: options.h:103
unsigned int socket_set(struct link_socket *s, struct event_set *es, unsigned int rwflags, void *arg, unsigned int *persistent)
Definition: socket.c:3800
void setenv_in6_addr(struct env_set *es, const char *name_prefix, const struct in6_addr *addr, const unsigned int flags)
Definition: socket.c:3007
void frame_set_mtu_dynamic(struct frame *frame, int mtu, unsigned int flags)
Definition: mtu.c:87
volatile int signal_received
Definition: sig.h:45
#define ALLOC_OBJ_CLEAR_GC(dptr, type, gc)
Definition: buffer.h:1087
char * bind_dev
Definition: options.h:370
uint16_t packet_size_type
Definition: socket.h:55
#define M_ERR
Definition: error.h:114
bool plugin_defined(const struct plugin_list *pl, const int type)
Definition: plugin.c:892
socket_descriptor_t create_socket_tcp(struct addrinfo *addrinfo)
Definition: socket.c:1010
bool ip_addr_dotted_quad_safe(const char *dotted_quad)
Definition: socket.c:699
struct addrinfo * ai
Definition: socket.h:80
void bad_address_length(int actual, int expected)
Definition: socket.c:3182
#define GETADDR_FATAL
Definition: socket.h:472
void link_socket_init_phase2(struct context *c)
Definition: socket.c:2146
void socket_adjust_frame_parameters(struct frame *frame, int proto)
Definition: socket.c:2312
static void socket_set_mark(socket_descriptor_t sd, int mark)
Definition: socket.c:957
SOCKET socket_descriptor_t
Definition: syshead.h:445
#define D_STREAM_DEBUG
Definition: errlevel.h:166
#define IF_NAMESIZE
Definition: socket.c:2801
static void phase2_socks_client(struct link_socket *sock, struct signal_info *sig_info)
Definition: socket.c:2107
char server[128]
Definition: socks.h:40
static bool buf_safe(const struct buffer *buf, size_t len)
Definition: buffer.h:541
void setenv_int(struct env_set *es, const char *name, int value)
Definition: env_set.c:269
bool addr_defined
Definition: win32.h:208
Wrapper structure for dynamically allocated memory.
Definition: buffer.h:60
#define M_FATAL
Definition: error.h:98
static void socket_do_listen(socket_descriptor_t sd, const struct addrinfo *local, bool do_listen, bool do_set_nonblock)
Definition: socket.c:1189
void set_actual_address(struct link_socket_actual *actual, struct addrinfo *ai)
Definition: socket.c:1532
DWORD flags
Definition: win32.h:206
int link_socket_read_tcp(struct link_socket *sock, struct buffer *buf)
Definition: socket.c:3194
void frame_adjust_path_mtu(struct frame *frame, int pmtu, int proto)
Definition: socket.c:1664
#define GETADDR_CACHE_MASK
Definition: socket.h:484
#define buf_init(buf, offset)
Definition: buffer.h:196
bool residual_fully_formed
Definition: socket.h:134
static bool buf_write_prepend(struct buffer *dest, const void *src, int size)
Definition: buffer.h:701
struct plugin_list * plugins
List of plug-ins.
Definition: openvpn.h:490
struct http_proxy_info * http_proxy
Definition: openvpn.h:184
static unsigned int sf2gaf(const unsigned int getaddr_flags, const unsigned int sockflags)
Definition: socket.c:62
const char * port
Definition: socks.h:41
void do_preresolve(struct context *c)
Definition: socket.c:341
void management_set_state(struct management *man, const int state, const char *detail, const in_addr_t *tun_local_ip, const struct in6_addr *tun_local_ip6, const struct openvpn_sockaddr *local, const struct openvpn_sockaddr *remote)
Definition: manage.c:2665
struct event_timeout server_poll_interval
Definition: openvpn.h:396
#define IOSTATE_INITIAL
Definition: win32.h:200
int flags
Definition: socket.h:79
static void phase2_tcp_server(struct link_socket *sock, const char *remote_dynamic, volatile int *signal_received)
Definition: socket.c:2022
static void resolve_bind_local(struct link_socket *sock, const sa_family_t af)
Definition: socket.c:1670
struct buffer alloc_buf_gc(size_t size, struct gc_arena *gc)
Definition: buffer.c:90
#define ENABLE_IP_PKTINFO
Definition: syshead.h:387
bool establish_http_proxy_passthru(struct http_proxy_info *p, socket_descriptor_t sd, const char *host, const char *port, struct event_timeout *server_poll_timeout, struct buffer *lookahead, volatile int *signal_received)
Definition: proxy.c:631
#define GETADDR_MSG_VIRT_OUT
Definition: socket.h:477
static bool dns_addr_safe(const char *addr)
Definition: socket.c:771
#define M_WARN
Definition: error.h:100
static int get_addr_generic(sa_family_t af, unsigned int flags, const char *hostname, void *network, unsigned int *netbits, int resolve_retry_seconds, volatile int *signal_received, int msglevel)
Definition: socket.c:79
socket_descriptor_t socket_do_accept(socket_descriptor_t sd, struct link_socket_actual *act, const bool nowait)
Definition: socket.c:1216
static void addr_zero_host(struct openvpn_sockaddr *addr)
Definition: socket.h:824
static void create_socket(struct link_socket *sock, struct addrinfo *addr)
Definition: socket.c:1117
static int buf_forward_capacity_total(const struct buffer *buf)
Definition: buffer.h:580
static int do_preresolve_host(struct context *c, const char *hostname, const char *servname, const int af, const int flags)
Definition: socket.c:287
#define SOL_IP
Definition: syshead.h:395
#define free
Definition: cmocka.c:1850
static void buf_reset(struct buffer *buf)
Definition: buffer.h:290
#define EVENT_WRITE
Definition: event.h:40
void argv_parse_cmd(struct argv *argres, const char *cmdstr)
Parses a command string, tokenizes it and puts each element into a separate struct argv argument slot...
Definition: argv.c:485
bool get_ipv6_addr(const char *hostname, struct in6_addr *network, unsigned int *netbits, int msglevel)
Translate an IPv6 addr or hostname from string form to in6_addr.
Definition: socket.c:224
Garbage collection arena used to keep track of dynamically allocated memory.
Definition: buffer.h:116
sa_family_t af
Definition: options.h:99
void set_cloexec(socket_descriptor_t fd)
Definition: fdmisc.c:81
void establish_socks_proxy_udpassoc(struct socks_proxy_info *p, socket_descriptor_t ctrl_sd, socket_descriptor_t udp_sd, struct openvpn_sockaddr *relay_addr, volatile int *signal_received)
Definition: socks.c:519
void management_sleep(const int n)
A sleep function that services the management layer for n seconds rather than doing nothing...
Definition: manage.c:4043
bool bind_local
Definition: options.h:108
#define GETADDR_PASSIVE
Definition: socket.h:481
#define SF_PORT_SHARE
Definition: socket.h:205
#define GETADDR_FATAL_ON_SIGNAL
Definition: socket.h:475
#define D_STREAM_ERRORS
Definition: errlevel.h:63
int mtu_discover_type
Definition: options.h:125
#define BSTR(buf)
Definition: buffer.h:129
void link_socket_update_buffer_sizes(struct link_socket *ls, int rcvbuf, int sndbuf)
Definition: socket.c:994
void argv_free(struct argv *a)
Frees all memory allocations allocated by the struct argv related functions.
Definition: argv.c:104
bool bind_ipv6_only
Definition: options.h:107
#define PS_DONT_SHOW_ADDR
Definition: socket.h:312
struct gc_arena gc
Garbage collection arena for allocations done in the scope of this context structure.
Definition: openvpn.h:480
static bool addr_local(const struct sockaddr *addr)
Definition: socket.h:637
#define UINT8_MAX
Definition: socket.c:2911
void link_socket_close(struct link_socket *sock)
Definition: socket.c:2259
#define PS_SHOW_PKTINFO
Definition: socket.h:311
Definition: argv.h:35
event_t socket_listen_event_handle(struct link_socket *s)
Definition: socket.c:2696
int socket_send_queue(struct link_socket *sock, struct buffer *buf, const struct link_socket_actual *to)
Definition: socket.c:3560
static int datagram_overhead(int proto)
Definition: socket.h:590
const char * proto2ascii(int proto, sa_family_t af, bool display_form)
Definition: socket.c:3091
void setenv_in_addr_t(struct env_set *es, const char *name_prefix, in_addr_t addr, const unsigned int flags)
Definition: socket.c:2994
#define D_WIN32_IO
Definition: errlevel.h:167
bool mac_addr_safe(const char *mac_addr)
Definition: socket.c:802
static void stream_buf_set_next(struct stream_buf *sb)
Definition: socket.c:2565
static SERVICE_STATUS status
Definition: interactive.c:56
#define CC_DASH
Definition: buffer.h:926
void link_socket_connection_initiated(struct link_socket_info *info, const struct link_socket_actual *act, const char *common_name, struct env_set *es)
Definition: socket.c:2343
#define SF_USE_IP_PKTINFO
Definition: socket.h:203
struct sockaddr sa
Definition: socket.h:68
static int socket_get_sndbuf(socket_descriptor_t sd)
Definition: socket.c:849
static void stream_buf_init(struct stream_buf *sb, struct buffer *buf, const unsigned int sockflags, const int proto)
Definition: socket.c:2544
#define GETADDR_RESOLVE
Definition: socket.h:471
const char * short_form
Definition: socket.c:3036
#define SF_HOST_RANDOMIZE
Definition: socket.h:206
#define RESOLV_RETRY_INFINITE
Definition: socket.h:47
struct http_proxy_options options
Definition: proxy.h:70
int mark
Definition: options.h:369
static bool link_socket_proto_connection_oriented(int proto)
Definition: socket.h:601
bool ipv6_addr_safe(const char *ipv6_text_addr)
Definition: socket.c:749
#define D_LINK_ERRORS
Definition: errlevel.h:57
struct in6_addr add_in6_addr(struct in6_addr base, uint32_t add)
Definition: socket.c:2918
int maxlen
Definition: socket.h:133
const char * servname
Definition: socket.h:77
in_addr_t link_socket_current_remote(const struct link_socket_info *info)
Definition: socket.c:2429
bool argv_printf(struct argv *argres, const char *format,...)
printf() variant which populates a struct argv.
Definition: argv.c:442
const char * addr_family_name(int af)
Definition: socket.c:3130
static bool socket_set_rcvbuf(socket_descriptor_t sd, int size)
Definition: socket.c:894