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) 2002-2018 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 #ifdef HAVE_GETPEERNAME
1231  if (nowait)
1232  {
1233  new_sd = getpeername(sd, &act->dest.addr.sa, &remote_len);
1234 
1235  if (!socket_defined(new_sd))
1236  {
1237  msg(D_LINK_ERRORS | M_ERRNO, "TCP: getpeername() failed");
1238  }
1239  else
1240  {
1241  new_sd = sd;
1242  }
1243  }
1244 #else /* ifdef HAVE_GETPEERNAME */
1245  if (nowait)
1246  {
1247  msg(M_WARN, "TCP: this OS does not provide the getpeername() function");
1248  }
1249 #endif
1250  else
1251  {
1252  new_sd = accept(sd, &act->dest.addr.sa, &remote_len);
1253  }
1254 
1255 #if 0 /* For debugging only, test the effect of accept() failures */
1256  {
1257  static int foo = 0;
1258  ++foo;
1259  if (foo & 1)
1260  {
1261  new_sd = -1;
1262  }
1263  }
1264 #endif
1265 
1266  if (!socket_defined(new_sd))
1267  {
1268  msg(D_LINK_ERRORS | M_ERRNO, "TCP: accept(%d) failed", (int)sd);
1269  }
1270  /* only valid if we have remote_len_af!=0 */
1271  else if (remote_len_af && remote_len != remote_len_af)
1272  {
1273  msg(D_LINK_ERRORS, "TCP: Received strange incoming connection with unknown address length=%d", remote_len);
1274  openvpn_close_socket(new_sd);
1275  new_sd = SOCKET_UNDEFINED;
1276  }
1277  else
1278  {
1279  /* set socket file descriptor to not pass across execs, so that
1280  * scripts don't have access to it */
1281  set_cloexec(sd);
1282  }
1283  return new_sd;
1284 }
1285 
1286 static void
1288 {
1289  struct gc_arena gc = gc_new();
1290  msg(M_INFO, "TCP connection established with %s",
1291  print_link_socket_actual(act, &gc));
1292  gc_free(&gc);
1293 }
1294 
1295 static socket_descriptor_t
1297  struct link_socket_actual *act,
1298  const char *remote_dynamic,
1299  const struct addrinfo *local,
1300  bool do_listen,
1301  bool nowait,
1302  volatile int *signal_received)
1303 {
1304  struct gc_arena gc = gc_new();
1305  /* struct openvpn_sockaddr *remote = &act->dest; */
1306  struct openvpn_sockaddr remote_verify = act->dest;
1308 
1309  CLEAR(*act);
1310  socket_do_listen(sd, local, do_listen, true);
1311 
1312  while (true)
1313  {
1314  int status;
1315  fd_set reads;
1316  struct timeval tv;
1317 
1318  FD_ZERO(&reads);
1319  openvpn_fd_set(sd, &reads);
1320  tv.tv_sec = 0;
1321  tv.tv_usec = 0;
1322 
1323  status = select(sd + 1, &reads, NULL, NULL, &tv);
1324 
1325  get_signal(signal_received);
1326  if (*signal_received)
1327  {
1328  gc_free(&gc);
1329  return sd;
1330  }
1331 
1332  if (status < 0)
1333  {
1334  msg(D_LINK_ERRORS | M_ERRNO, "TCP: select() failed");
1335  }
1336 
1337  if (status <= 0)
1338  {
1339  management_sleep(1);
1340  continue;
1341  }
1342 
1343  new_sd = socket_do_accept(sd, act, nowait);
1344 
1345  if (socket_defined(new_sd))
1346  {
1347  struct addrinfo *ai = NULL;
1348  if (remote_dynamic)
1349  {
1350  openvpn_getaddrinfo(0, remote_dynamic, NULL, 1, NULL,
1351  remote_verify.addr.sa.sa_family, &ai);
1352  }
1353 
1354  if (ai && !addrlist_match(&remote_verify, ai))
1355  {
1356  msg(M_WARN,
1357  "TCP NOTE: Rejected connection attempt from %s due to --remote setting",
1358  print_link_socket_actual(act, &gc));
1359  if (openvpn_close_socket(new_sd))
1360  {
1361  msg(M_ERR, "TCP: close socket failed (new_sd)");
1362  }
1363  freeaddrinfo(ai);
1364  }
1365  else
1366  {
1367  if (ai)
1368  {
1369  freeaddrinfo(ai);
1370  }
1371  break;
1372  }
1373  }
1374  management_sleep(1);
1375  }
1376 
1377  if (!nowait && openvpn_close_socket(sd))
1378  {
1379  msg(M_ERR, "TCP: close socket failed (sd)");
1380  }
1381 
1383 
1384  gc_free(&gc);
1385  return new_sd;
1386 }
1387 
1388 void
1390  struct addrinfo *local,
1391  int ai_family,
1392  const char *prefix,
1393  bool ipv6only)
1394 {
1395  struct gc_arena gc = gc_new();
1396 
1397  /* FIXME (schwabe)
1398  * getaddrinfo for the bind address might return multiple AF_INET/AF_INET6
1399  * entries for the requested protocol.
1400  * For example if an address has multiple A records
1401  * What is the correct way to deal with it?
1402  */
1403 
1404  struct addrinfo *cur;
1405 
1406  ASSERT(local);
1407 
1408 
1409  /* find the first addrinfo with correct ai_family */
1410  for (cur = local; cur; cur = cur->ai_next)
1411  {
1412  if (cur->ai_family == ai_family)
1413  {
1414  break;
1415  }
1416  }
1417  if (!cur)
1418  {
1419  msg(M_FATAL, "%s: Socket bind failed: Addr to bind has no %s record",
1420  prefix, addr_family_name(ai_family));
1421  }
1422 
1423  if (ai_family == AF_INET6)
1424  {
1425  int v6only = ipv6only ? 1 : 0; /* setsockopt must have an "int" */
1426 
1427  msg(M_INFO, "setsockopt(IPV6_V6ONLY=%d)", v6only);
1428  if (setsockopt(sd, IPPROTO_IPV6, IPV6_V6ONLY, (void *) &v6only, sizeof(v6only)))
1429  {
1430  msg(M_NONFATAL|M_ERRNO, "Setting IPV6_V6ONLY=%d failed", v6only);
1431  }
1432  }
1433  if (bind(sd, cur->ai_addr, cur->ai_addrlen))
1434  {
1435  msg(M_FATAL | M_ERRNO, "%s: Socket bind failed on local address %s",
1436  prefix,
1437  print_sockaddr_ex(local->ai_addr, ":", PS_SHOW_PORT, &gc));
1438  }
1439  gc_free(&gc);
1440 }
1441 
1442 int
1444  const struct sockaddr *remote,
1445  int connect_timeout,
1446  volatile int *signal_received)
1447 {
1448  int status = 0;
1449 
1450 #ifdef TARGET_ANDROID
1451  protect_fd_nonlocal(sd, remote);
1452 #endif
1453 
1454  set_nonblock(sd);
1455  status = connect(sd, remote, af_addr_size(remote->sa_family));
1456  if (status)
1457  {
1458  status = openvpn_errno();
1459  }
1460  if (
1461 #ifdef _WIN32
1462  status == WSAEWOULDBLOCK
1463 #else
1464  status == EINPROGRESS
1465 #endif
1466  )
1467  {
1468  while (true)
1469  {
1470 #if POLL
1471  struct pollfd fds[1];
1472  fds[0].fd = sd;
1473  fds[0].events = POLLOUT;
1474  status = poll(fds, 1, (connect_timeout > 0) ? 1000 : 0);
1475 #else
1476  fd_set writes;
1477  struct timeval tv;
1478 
1479  FD_ZERO(&writes);
1480  openvpn_fd_set(sd, &writes);
1481  tv.tv_sec = (connect_timeout > 0) ? 1 : 0;
1482  tv.tv_usec = 0;
1483 
1484  status = select(sd + 1, NULL, &writes, NULL, &tv);
1485 #endif
1486  if (signal_received)
1487  {
1488  get_signal(signal_received);
1489  if (*signal_received)
1490  {
1491  status = 0;
1492  break;
1493  }
1494  }
1495  if (status < 0)
1496  {
1497  status = openvpn_errno();
1498  break;
1499  }
1500  if (status <= 0)
1501  {
1502  if (--connect_timeout < 0)
1503  {
1504 #ifdef _WIN32
1505  status = WSAETIMEDOUT;
1506 #else
1507  status = ETIMEDOUT;
1508 #endif
1509  break;
1510  }
1511  management_sleep(0);
1512  continue;
1513  }
1514 
1515  /* got it */
1516  {
1517  int val = 0;
1518  socklen_t len;
1519 
1520  len = sizeof(val);
1521  if (getsockopt(sd, SOL_SOCKET, SO_ERROR, (void *) &val, &len) == 0
1522  && len == sizeof(val))
1523  {
1524  status = val;
1525  }
1526  else
1527  {
1528  status = openvpn_errno();
1529  }
1530  break;
1531  }
1532  }
1533  }
1534 
1535  return status;
1536 }
1537 
1538 void
1539 set_actual_address(struct link_socket_actual *actual, struct addrinfo *ai)
1540 {
1541  CLEAR(*actual);
1542  ASSERT(ai);
1543 
1544  if (ai->ai_family == AF_INET)
1545  {
1546  actual->dest.addr.in4 =
1547  *((struct sockaddr_in *) ai->ai_addr);
1548  }
1549  else if (ai->ai_family == AF_INET6)
1550  {
1551  actual->dest.addr.in6 =
1552  *((struct sockaddr_in6 *) ai->ai_addr);
1553  }
1554  else
1555  {
1556  ASSERT(0);
1557  }
1558 
1559 }
1560 
1561 static void
1563  const struct sockaddr *dest,
1564  const int connect_timeout,
1565  struct signal_info *sig_info)
1566 {
1567  struct gc_arena gc = gc_new();
1568  int status;
1569 
1570  msg(M_INFO, "Attempting to establish TCP connection with %s",
1571  print_sockaddr(dest, &gc));
1572 
1573 #ifdef ENABLE_MANAGEMENT
1574  if (management)
1575  {
1578  NULL,
1579  NULL,
1580  NULL,
1581  NULL,
1582  NULL);
1583  }
1584 #endif
1585 
1586  /* Set the actual address */
1587  status = openvpn_connect(*sd, dest, connect_timeout, &sig_info->signal_received);
1588 
1589  get_signal(&sig_info->signal_received);
1590  if (sig_info->signal_received)
1591  {
1592  goto done;
1593  }
1594 
1595  if (status)
1596  {
1597 
1598  msg(D_LINK_ERRORS, "TCP: connect to %s failed: %s",
1599  print_sockaddr(dest, &gc), strerror(status));
1600 
1601  openvpn_close_socket(*sd);
1602  *sd = SOCKET_UNDEFINED;
1603  sig_info->signal_received = SIGUSR1;
1605  }
1606  else
1607  {
1608  msg(M_INFO, "TCP connection established with %s",
1609  print_sockaddr(dest, &gc));
1610  }
1611 
1612 done:
1613  gc_free(&gc);
1614 }
1615 
1616 /*
1617  * Stream buffer handling prototypes -- stream_buf is a helper class
1618  * to assist in the packetization of stream transport protocols
1619  * such as TCP.
1620  */
1621 
1622 static void
1623 stream_buf_init(struct stream_buf *sb, struct buffer *buf,
1624  const unsigned int sockflags, const int proto);
1625 
1626 static void
1627 stream_buf_close(struct stream_buf *sb);
1628 
1629 static bool
1630 stream_buf_added(struct stream_buf *sb, int length_added);
1631 
1632 /* For stream protocols, allocate a buffer to build up packet.
1633  * Called after frame has been finalized. */
1634 
1635 static void
1636 socket_frame_init(const struct frame *frame, struct link_socket *sock)
1637 {
1638 #ifdef _WIN32
1639  overlapped_io_init(&sock->reads, frame, FALSE, false);
1640  overlapped_io_init(&sock->writes, frame, TRUE, false);
1641  sock->rw_handle.read = sock->reads.overlapped.hEvent;
1642  sock->rw_handle.write = sock->writes.overlapped.hEvent;
1643 #endif
1644 
1646  {
1647 #ifdef _WIN32
1648  stream_buf_init(&sock->stream_buf,
1649  &sock->reads.buf_init,
1650  sock->sockflags,
1651  sock->info.proto);
1652 #else
1654  frame,
1655  false,
1657 
1658  stream_buf_init(&sock->stream_buf,
1659  &sock->stream_buf_data,
1660  sock->sockflags,
1661  sock->info.proto);
1662 #endif
1663  }
1664 }
1665 
1666 /*
1667  * Adjust frame structure based on a Path MTU value given
1668  * to us by the OS.
1669  */
1670 void
1671 frame_adjust_path_mtu(struct frame *frame, int pmtu, int proto)
1672 {
1674 }
1675 
1676 static void
1678 {
1679  struct gc_arena gc = gc_new();
1680 
1681  /* resolve local address if undefined */
1682  if (!sock->info.lsa->bind_local)
1683  {
1686  int status;
1687 
1688  if (proto_is_dgram(sock->info.proto))
1689  {
1690  flags |= GETADDR_DATAGRAM;
1691  }
1692 
1693  /* will return AF_{INET|INET6}from local_host */
1694  status = get_cached_dns_entry(sock->dns_cache,
1695  sock->local_host,
1696  sock->local_port,
1697  af,
1698  flags,
1699  &sock->info.lsa->bind_local);
1700 
1701  if (status)
1702  {
1703  status = openvpn_getaddrinfo(flags, sock->local_host, sock->local_port, 0,
1704  NULL, af, &sock->info.lsa->bind_local);
1705  }
1706 
1707  if (status !=0)
1708  {
1709  msg(M_FATAL, "getaddrinfo() failed for local \"%s:%s\": %s",
1710  sock->local_host, sock->local_port,
1711  gai_strerror(status));
1712  }
1713  }
1714 
1715  gc_free(&gc);
1716 }
1717 
1718 static void
1720  int phase,
1721  const char **remote_dynamic,
1722  volatile int *signal_received)
1723 {
1724  struct gc_arena gc = gc_new();
1725 
1726  /* resolve remote address if undefined */
1727  if (!sock->info.lsa->remote_list)
1728  {
1729  if (sock->remote_host)
1730  {
1732  int retry = 0;
1733  int status = -1;
1734  struct addrinfo *ai;
1735  if (proto_is_dgram(sock->info.proto))
1736  {
1737  flags |= GETADDR_DATAGRAM;
1738  }
1739 
1741  {
1742  if (phase == 2)
1743  {
1744  flags |= (GETADDR_TRY_ONCE | GETADDR_FATAL);
1745  }
1746  retry = 0;
1747  }
1748  else if (phase == 1)
1749  {
1750  if (sock->resolve_retry_seconds)
1751  {
1752  retry = 0;
1753  }
1754  else
1755  {
1757  retry = 0;
1758  }
1759  }
1760  else if (phase == 2)
1761  {
1762  if (sock->resolve_retry_seconds)
1763  {
1764  flags |= GETADDR_FATAL;
1765  retry = sock->resolve_retry_seconds;
1766  }
1767  else
1768  {
1769  ASSERT(0);
1770  }
1771  }
1772  else
1773  {
1774  ASSERT(0);
1775  }
1776 
1777 
1778  status = get_cached_dns_entry(sock->dns_cache,
1779  sock->remote_host,
1780  sock->remote_port,
1781  sock->info.af,
1782  flags, &ai);
1783  if (status)
1784  {
1785  status = openvpn_getaddrinfo(flags, sock->remote_host, sock->remote_port,
1786  retry, signal_received, sock->info.af, &ai);
1787  }
1788 
1789  if (status == 0)
1790  {
1791  sock->info.lsa->remote_list = ai;
1792  sock->info.lsa->current_remote = ai;
1793 
1795  "RESOLVE_REMOTE flags=0x%04x phase=%d rrs=%d sig=%d status=%d",
1796  flags,
1797  phase,
1798  retry,
1799  signal_received ? *signal_received : -1,
1800  status);
1801  }
1802  if (signal_received)
1803  {
1804  if (*signal_received)
1805  {
1806  goto done;
1807  }
1808  }
1809  if (status!=0)
1810  {
1811  if (signal_received)
1812  {
1813  *signal_received = SIGUSR1;
1814  }
1815  goto done;
1816  }
1817  }
1818  }
1819 
1820  /* should we re-use previous active remote address? */
1822  {
1823  msg(M_INFO, "TCP/UDP: Preserving recently used remote address: %s",
1824  print_link_socket_actual(&sock->info.lsa->actual, &gc));
1825  if (remote_dynamic)
1826  {
1827  *remote_dynamic = NULL;
1828  }
1829  }
1830  else
1831  {
1832  CLEAR(sock->info.lsa->actual);
1833  if (sock->info.lsa->current_remote)
1834  {
1836  sock->info.lsa->current_remote);
1837  }
1838  }
1839 
1840 done:
1841  gc_free(&gc);
1842 }
1843 
1844 
1845 
1846 struct link_socket *
1848 {
1849  struct link_socket *sock;
1850 
1851  ALLOC_OBJ_CLEAR(sock, struct link_socket);
1852  sock->sd = SOCKET_UNDEFINED;
1853  sock->ctrl_sd = SOCKET_UNDEFINED;
1854  return sock;
1855 }
1856 
1857 void
1859 {
1860  struct link_socket *sock = c->c2.link_socket;
1861  struct options *o = &c->options;
1862  ASSERT(sock);
1863 
1864  const char *remote_host = o->ce.remote;
1865  const char *remote_port = o->ce.remote_port;
1866 
1867  sock->local_host = o->ce.local;
1868  sock->local_port = o->ce.local_port;
1869  sock->remote_host = remote_host;
1870  sock->remote_port = remote_port;
1871  sock->dns_cache = c->c1.dns_cache;
1872  sock->http_proxy = c->c1.http_proxy;
1873  sock->socks_proxy = c->c1.socks_proxy;
1874  sock->bind_local = o->ce.bind_local;
1877 
1878 #ifdef ENABLE_DEBUG
1879  sock->gremlin = o->gremlin;
1880 #endif
1881 
1882  sock->socket_buffer_sizes.rcvbuf = o->rcvbuf;
1883  sock->socket_buffer_sizes.sndbuf = o->sndbuf;
1884 
1885  sock->sockflags = o->sockflags;
1886 #if PORT_SHARE
1887  if (o->port_share_host && o->port_share_port)
1888  {
1889  sock->sockflags |= SF_PORT_SHARE;
1890  }
1891 #endif
1892  sock->mark = o->mark;
1893  sock->bind_dev = o->bind_dev;
1894 
1895  sock->info.proto = o->ce.proto;
1896  sock->info.af = o->ce.af;
1897  sock->info.remote_float = o->ce.remote_float;
1898  sock->info.lsa = &c->c1.link_socket_addr;
1899  sock->info.bind_ipv6_only = o->ce.bind_ipv6_only;
1900  sock->info.ipchange_command = o->ipchange;
1901  sock->info.plugins = c->plugins;
1903 
1904  sock->mode = mode;
1905  if (mode == LS_MODE_TCP_ACCEPT_FROM)
1906  {
1907  ASSERT(c->c2.accept_from);
1908  ASSERT(sock->info.proto == PROTO_TCP_SERVER);
1909  sock->sd = c->c2.accept_from->sd;
1910  /* inherit (possibly guessed) info AF from parent context */
1911  sock->info.af = c->c2.accept_from->info.af;
1912  }
1913 
1914  /* are we running in HTTP proxy mode? */
1915  if (sock->http_proxy)
1916  {
1917  ASSERT(sock->info.proto == PROTO_TCP_CLIENT);
1918 
1919  /* the proxy server */
1920  sock->remote_host = c->c1.http_proxy->options.server;
1921  sock->remote_port = c->c1.http_proxy->options.port;
1922 
1923  /* the OpenVPN server we will use the proxy to connect to */
1924  sock->proxy_dest_host = remote_host;
1925  sock->proxy_dest_port = remote_port;
1926  }
1927  /* or in Socks proxy mode? */
1928  else if (sock->socks_proxy)
1929  {
1930  /* the proxy server */
1931  sock->remote_host = c->c1.socks_proxy->server;
1932  sock->remote_port = c->c1.socks_proxy->port;
1933 
1934  /* the OpenVPN server we will use the proxy to connect to */
1935  sock->proxy_dest_host = remote_host;
1936  sock->proxy_dest_port = remote_port;
1937  }
1938  else
1939  {
1940  sock->remote_host = remote_host;
1941  sock->remote_port = remote_port;
1942  }
1943 
1944  /* bind behavior for TCP server vs. client */
1945  if (sock->info.proto == PROTO_TCP_SERVER)
1946  {
1947  if (sock->mode == LS_MODE_TCP_ACCEPT_FROM)
1948  {
1949  sock->bind_local = false;
1950  }
1951  else
1952  {
1953  sock->bind_local = true;
1954  }
1955  }
1956 
1957  if (mode != LS_MODE_TCP_ACCEPT_FROM)
1958  {
1959  if (sock->bind_local)
1960  {
1961  resolve_bind_local(sock, sock->info.af);
1962  }
1963  resolve_remote(sock, 1, NULL, NULL);
1964  }
1965 }
1966 
1967 static void
1969 {
1970  /* set misc socket parameters */
1971  socket_set_flags(sock->sd, sock->sockflags);
1972 
1973  /* set socket to non-blocking mode */
1974  set_nonblock(sock->sd);
1975 
1976  /* set Path MTU discovery options on the socket */
1977  set_mtu_discover_type(sock->sd, sock->mtu_discover_type, sock->info.af);
1978 
1979 #if EXTENDED_SOCKET_ERROR_CAPABILITY
1980  /* if the OS supports it, enable extended error passing on the socket */
1981  set_sock_extended_error_passing(sock->sd);
1982 #endif
1983 }
1984 
1985 
1986 static void
1988 {
1989  struct gc_arena gc = gc_new();
1990  const int msglevel = (sock->mode == LS_MODE_TCP_ACCEPT_FROM) ? D_INIT_MEDIUM : M_INFO;
1991 
1992  /* print local address */
1993  if (sock->bind_local)
1994  {
1995  sa_family_t ai_family = sock->info.lsa->actual.dest.addr.sa.sa_family;
1996  /* Socket is always bound on the first matching address,
1997  * For bound sockets with no remote addr this is the element of
1998  * the list */
1999  struct addrinfo *cur;
2000  for (cur = sock->info.lsa->bind_local; cur; cur = cur->ai_next)
2001  {
2002  if (!ai_family || ai_family == cur->ai_family)
2003  {
2004  break;
2005  }
2006  }
2007  ASSERT(cur);
2008  msg(msglevel, "%s link local (bound): %s",
2009  proto2ascii(sock->info.proto, sock->info.af, true),
2010  print_sockaddr(cur->ai_addr,&gc));
2011  }
2012  else
2013  {
2014  msg(msglevel, "%s link local: (not bound)",
2015  proto2ascii(sock->info.proto, sock->info.af, true));
2016  }
2017 
2018  /* print active remote address */
2019  msg(msglevel, "%s link remote: %s",
2020  proto2ascii(sock->info.proto, sock->info.af, true),
2022  ":",
2024  &gc));
2025  gc_free(&gc);
2026 }
2027 
2028 static void
2029 phase2_tcp_server(struct link_socket *sock, const char *remote_dynamic,
2030  volatile int *signal_received)
2031 {
2032  switch (sock->mode)
2033  {
2034  case LS_MODE_DEFAULT:
2035  sock->sd = socket_listen_accept(sock->sd,
2036  &sock->info.lsa->actual,
2037  remote_dynamic,
2038  sock->info.lsa->bind_local,
2039  true,
2040  false,
2041  signal_received);
2042  break;
2043 
2044  case LS_MODE_TCP_LISTEN:
2045  socket_do_listen(sock->sd,
2046  sock->info.lsa->bind_local,
2047  true,
2048  false);
2049  break;
2050 
2052  sock->sd = socket_do_accept(sock->sd,
2053  &sock->info.lsa->actual,
2054  false);
2055  if (!socket_defined(sock->sd))
2056  {
2057  *signal_received = SIGTERM;
2058  return;
2059  }
2061  break;
2062 
2063  default:
2064  ASSERT(0);
2065  }
2066 }
2067 
2068 
2069 static void
2070 phase2_tcp_client(struct link_socket *sock, struct signal_info *sig_info)
2071 {
2072  bool proxy_retry = false;
2073  do
2074  {
2075  socket_connect(&sock->sd,
2076  sock->info.lsa->current_remote->ai_addr,
2078  sig_info);
2079 
2080  if (sig_info->signal_received)
2081  {
2082  return;
2083  }
2084 
2085  if (sock->http_proxy)
2086  {
2087  proxy_retry = establish_http_proxy_passthru(sock->http_proxy,
2088  sock->sd,
2089  sock->proxy_dest_host,
2090  sock->proxy_dest_port,
2091  sock->server_poll_timeout,
2092  &sock->stream_buf.residual,
2093  &sig_info->signal_received);
2094  }
2095  else if (sock->socks_proxy)
2096  {
2098  sock->sd,
2099  sock->proxy_dest_host,
2100  sock->proxy_dest_port,
2101  &sig_info->signal_received);
2102  }
2103  if (proxy_retry)
2104  {
2105  openvpn_close_socket(sock->sd);
2106  sock->sd = create_socket_tcp(sock->info.lsa->current_remote);
2107  }
2108 
2109  } while (proxy_retry);
2110 
2111 }
2112 
2113 static void
2114 phase2_socks_client(struct link_socket *sock, struct signal_info *sig_info)
2115 {
2116  socket_connect(&sock->ctrl_sd,
2117  sock->info.lsa->current_remote->ai_addr,
2119  sig_info);
2120 
2121  if (sig_info->signal_received)
2122  {
2123  return;
2124  }
2125 
2127  sock->ctrl_sd,
2128  sock->sd,
2129  &sock->socks_relay.dest,
2130  &sig_info->signal_received);
2131 
2132  if (sig_info->signal_received)
2133  {
2134  return;
2135  }
2136 
2137  sock->remote_host = sock->proxy_dest_host;
2138  sock->remote_port = sock->proxy_dest_port;
2139 
2140  addr_zero_host(&sock->info.lsa->actual.dest);
2141  if (sock->info.lsa->remote_list)
2142  {
2143  freeaddrinfo(sock->info.lsa->remote_list);
2144  sock->info.lsa->current_remote = NULL;
2145  sock->info.lsa->remote_list = NULL;
2146  }
2147 
2148  resolve_remote(sock, 1, NULL, &sig_info->signal_received);
2149 }
2150 
2151 /* finalize socket initialization */
2152 void
2154 {
2155  struct link_socket *sock = c->c2.link_socket;
2156  const struct frame *frame = &c->c2.frame;
2157  struct signal_info *sig_info = c->sig;
2158 
2159  const char *remote_dynamic = NULL;
2160  int sig_save = 0;
2161 
2162  ASSERT(sock);
2163  ASSERT(sig_info);
2164 
2165  if (sig_info->signal_received)
2166  {
2167  sig_save = sig_info->signal_received;
2168  sig_info->signal_received = 0;
2169  }
2170 
2171  /* initialize buffers */
2172  socket_frame_init(frame, sock);
2173 
2174  /*
2175  * Pass a remote name to connect/accept so that
2176  * they can test for dynamic IP address changes
2177  * and throw a SIGUSR1 if appropriate.
2178  */
2179  if (sock->resolve_retry_seconds)
2180  {
2181  remote_dynamic = sock->remote_host;
2182  }
2183 
2184  /* Second chance to resolv/create socket */
2185  resolve_remote(sock, 2, &remote_dynamic, &sig_info->signal_received);
2186 
2187  /* If a valid remote has been found, create the socket with its addrinfo */
2188  if (sock->info.lsa->current_remote)
2189  {
2190  create_socket(sock, sock->info.lsa->current_remote);
2191  }
2192 
2193  /* If socket has not already been created create it now */
2194  if (sock->sd == SOCKET_UNDEFINED)
2195  {
2196  /* If we have no --remote and have still not figured out the
2197  * protocol family to use we will use the first of the bind */
2198 
2199  if (sock->bind_local && !sock->remote_host && sock->info.lsa->bind_local)
2200  {
2201  /* Warn if this is because neither v4 or v6 was specified
2202  * and we should not connect a remote */
2203  if (sock->info.af == AF_UNSPEC)
2204  {
2205  msg(M_WARN, "Could not determine IPv4/IPv6 protocol. Using %s",
2206  addr_family_name(sock->info.lsa->bind_local->ai_family));
2207  sock->info.af = sock->info.lsa->bind_local->ai_family;
2208  }
2209 
2210  create_socket(sock, sock->info.lsa->bind_local);
2211  }
2212  }
2213 
2214  /* Socket still undefined, give a warning and abort connection */
2215  if (sock->sd == SOCKET_UNDEFINED)
2216  {
2217  msg(M_WARN, "Could not determine IPv4/IPv6 protocol");
2218  sig_info->signal_received = SIGUSR1;
2219  goto done;
2220  }
2221 
2222  if (sig_info->signal_received)
2223  {
2224  goto done;
2225  }
2226 
2227  if (sock->info.proto == PROTO_TCP_SERVER)
2228  {
2229  phase2_tcp_server(sock, remote_dynamic,
2230  &sig_info->signal_received);
2231  }
2232  else if (sock->info.proto == PROTO_TCP_CLIENT)
2233  {
2234  phase2_tcp_client(sock, sig_info);
2235 
2236  }
2237  else if (sock->info.proto == PROTO_UDP && sock->socks_proxy)
2238  {
2239  phase2_socks_client(sock, sig_info);
2240  }
2241 #ifdef TARGET_ANDROID
2242  if (sock->sd != -1)
2243  {
2244  protect_fd_nonlocal(sock->sd, &sock->info.lsa->actual.dest.addr.sa);
2245  }
2246 #endif
2247  if (sig_info->signal_received)
2248  {
2249  goto done;
2250  }
2251 
2253  linksock_print_addr(sock);
2254 
2255 done:
2256  if (sig_save)
2257  {
2258  if (!sig_info->signal_received)
2259  {
2260  sig_info->signal_received = sig_save;
2261  }
2262  }
2263 }
2264 
2265 void
2267 {
2268  if (sock)
2269  {
2270 #ifdef ENABLE_DEBUG
2271  const int gremlin = GREMLIN_CONNECTION_FLOOD_LEVEL(sock->gremlin);
2272 #else
2273  const int gremlin = 0;
2274 #endif
2275 
2276  if (socket_defined(sock->sd))
2277  {
2278 #ifdef _WIN32
2279  close_net_event_win32(&sock->listen_handle, sock->sd, 0);
2280 #endif
2281  if (!gremlin)
2282  {
2283  msg(D_LOW, "TCP/UDP: Closing socket");
2284  if (openvpn_close_socket(sock->sd))
2285  {
2286  msg(M_WARN | M_ERRNO, "TCP/UDP: Close Socket failed");
2287  }
2288  }
2289  sock->sd = SOCKET_UNDEFINED;
2290 #ifdef _WIN32
2291  if (!gremlin)
2292  {
2293  overlapped_io_close(&sock->reads);
2294  overlapped_io_close(&sock->writes);
2295  }
2296 #endif
2297  }
2298 
2299  if (socket_defined(sock->ctrl_sd))
2300  {
2301  if (openvpn_close_socket(sock->ctrl_sd))
2302  {
2303  msg(M_WARN | M_ERRNO, "TCP/UDP: Close Socket (ctrl_sd) failed");
2304  }
2305  sock->ctrl_sd = SOCKET_UNDEFINED;
2306  }
2307 
2308  stream_buf_close(&sock->stream_buf);
2309  free_buf(&sock->stream_buf_data);
2310  if (!gremlin)
2311  {
2312  free(sock);
2313  }
2314  }
2315 }
2316 
2317 /* for stream protocols, allow for packet length prefix */
2318 void
2320 {
2322  {
2324  }
2325 }
2326 
2327 void
2328 setenv_trusted(struct env_set *es, const struct link_socket_info *info)
2329 {
2330  setenv_link_socket_actual(es, "trusted", &info->lsa->actual, SA_IP_PORT);
2331 }
2332 
2333 static void
2334 ipchange_fmt(const bool include_cmd, struct argv *argv, const struct link_socket_info *info, struct gc_arena *gc)
2335 {
2336  const char *host = print_sockaddr_ex(&info->lsa->actual.dest.addr.sa, " ", PS_SHOW_PORT, gc);
2337  if (include_cmd)
2338  {
2339  argv_parse_cmd(argv, info->ipchange_command);
2340  argv_printf_cat(argv, "%s", host);
2341  }
2342  else
2343  {
2344  argv_printf(argv, "%s", host);
2345  }
2346 
2347 }
2348 
2349 void
2351  const struct link_socket_actual *act,
2352  const char *common_name,
2353  struct env_set *es)
2354 {
2355  struct gc_arena gc = gc_new();
2356 
2357  info->lsa->actual = *act; /* Note: skip this line for --force-dest */
2358  setenv_trusted(es, info);
2359  info->connection_established = true;
2360 
2361  /* Print connection initiated message, with common name if available */
2362  {
2363  struct buffer out = alloc_buf_gc(256, &gc);
2364  if (common_name)
2365  {
2366  buf_printf(&out, "[%s] ", common_name);
2367  }
2368  buf_printf(&out, "Peer Connection Initiated with %s", print_link_socket_actual(&info->lsa->actual, &gc));
2369  msg(M_INFO, "%s", BSTR(&out));
2370  }
2371 
2372  /* set environmental vars */
2373  setenv_str(es, "common_name", common_name);
2374 
2375  /* Process --ipchange plugin */
2377  {
2378  struct argv argv = argv_new();
2379  ipchange_fmt(false, &argv, info, &gc);
2381  {
2382  msg(M_WARN, "WARNING: ipchange plugin call failed");
2383  }
2384  argv_free(&argv);
2385  }
2386 
2387  /* Process --ipchange option */
2388  if (info->ipchange_command)
2389  {
2390  struct argv argv = argv_new();
2391  setenv_str(es, "script_type", "ipchange");
2392  ipchange_fmt(true, &argv, info, &gc);
2393  openvpn_run_script(&argv, es, 0, "--ipchange");
2394  argv_free(&argv);
2395  }
2396 
2397  gc_free(&gc);
2398 }
2399 
2400 void
2402  const struct link_socket_info *info,
2403  const struct link_socket_actual *from_addr)
2404 {
2405  struct gc_arena gc = gc_new();
2406  struct addrinfo *ai;
2407 
2408  switch (from_addr->dest.addr.sa.sa_family)
2409  {
2410  case AF_INET:
2411  case AF_INET6:
2413  "TCP/UDP: Incoming packet rejected from %s[%d], expected peer address: %s (allow this incoming source address/port by removing --remote or adding --float)",
2414  print_link_socket_actual(from_addr, &gc),
2415  (int)from_addr->dest.addr.sa.sa_family,
2416  print_sockaddr_ex(info->lsa->remote_list->ai_addr,":",PS_SHOW_PORT, &gc));
2417  /* print additional remote addresses */
2418  for (ai = info->lsa->remote_list->ai_next; ai; ai = ai->ai_next)
2419  {
2420  msg(D_LINK_ERRORS,"or from peer address: %s",
2421  print_sockaddr_ex(ai->ai_addr,":",PS_SHOW_PORT, &gc));
2422  }
2423  break;
2424  }
2425  buf->len = 0;
2426  gc_free(&gc);
2427 }
2428 
2429 void
2431 {
2432  dmsg(D_READ_WRITE, "TCP/UDP: No outgoing address to send packet");
2433 }
2434 
2435 in_addr_t
2437 {
2438  const struct link_socket_addr *lsa = info->lsa;
2439 
2440 /*
2441  * This logic supports "redirect-gateway" semantic, which
2442  * makes sense only for PF_INET routes over PF_INET endpoints
2443  *
2444  * Maybe in the future consider PF_INET6 endpoints also ...
2445  * by now just ignore it
2446  *
2447  * For --remote entries with multiple addresses this
2448  * only return the actual endpoint we have successfully connected to
2449  */
2450  if (lsa->actual.dest.addr.sa.sa_family != AF_INET)
2451  {
2452  return IPV4_INVALID_ADDR;
2453  }
2454 
2456  {
2457  return ntohl(lsa->actual.dest.addr.in4.sin_addr.s_addr);
2458  }
2459  else if (lsa->current_remote)
2460  {
2461  return ntohl(((struct sockaddr_in *)lsa->current_remote->ai_addr)
2462  ->sin_addr.s_addr);
2463  }
2464  else
2465  {
2466  return 0;
2467  }
2468 }
2469 
2470 const struct in6_addr *
2472 {
2473  const struct link_socket_addr *lsa = info->lsa;
2474 
2475 /* This logic supports "redirect-gateway" semantic,
2476  * for PF_INET6 routes over PF_INET6 endpoints
2477  *
2478  * For --remote entries with multiple addresses this
2479  * only return the actual endpoint we have successfully connected to
2480  */
2481  if (lsa->actual.dest.addr.sa.sa_family != AF_INET6)
2482  {
2483  return NULL;
2484  }
2485 
2487  {
2488  return &(lsa->actual.dest.addr.in6.sin6_addr);
2489  }
2490  else if (lsa->current_remote)
2491  {
2492  return &(((struct sockaddr_in6 *)lsa->current_remote->ai_addr)->sin6_addr);
2493  }
2494  else
2495  {
2496  return NULL;
2497  }
2498 }
2499 
2500 /*
2501  * Return a status string describing socket state.
2502  */
2503 const char *
2504 socket_stat(const struct link_socket *s, unsigned int rwflags, struct gc_arena *gc)
2505 {
2506  struct buffer out = alloc_buf_gc(64, gc);
2507  if (s)
2508  {
2509  if (rwflags & EVENT_READ)
2510  {
2511  buf_printf(&out, "S%s",
2512  (s->rwflags_debug & EVENT_READ) ? "R" : "r");
2513 #ifdef _WIN32
2514  buf_printf(&out, "%s",
2516 #endif
2517  }
2518  if (rwflags & EVENT_WRITE)
2519  {
2520  buf_printf(&out, "S%s",
2521  (s->rwflags_debug & EVENT_WRITE) ? "W" : "w");
2522 #ifdef _WIN32
2523  buf_printf(&out, "%s",
2525 #endif
2526  }
2527  }
2528  else
2529  {
2530  buf_printf(&out, "S?");
2531  }
2532  return BSTR(&out);
2533 }
2534 
2535 /*
2536  * Stream buffer functions, used to packetize a TCP
2537  * stream connection.
2538  */
2539 
2540 static inline void
2542 {
2543  dmsg(D_STREAM_DEBUG, "STREAM: RESET");
2544  sb->residual_fully_formed = false;
2545  sb->buf = sb->buf_init;
2546  buf_reset(&sb->next);
2547  sb->len = -1;
2548 }
2549 
2550 static void
2552  struct buffer *buf,
2553  const unsigned int sockflags,
2554  const int proto)
2555 {
2556  sb->buf_init = *buf;
2557  sb->maxlen = sb->buf_init.len;
2558  sb->buf_init.len = 0;
2559  sb->residual = alloc_buf(sb->maxlen);
2560  sb->error = false;
2561 #if PORT_SHARE
2562  sb->port_share_state = ((sockflags & SF_PORT_SHARE) && (proto == PROTO_TCP_SERVER))
2563  ? PS_ENABLED
2564  : PS_DISABLED;
2565 #endif
2566  stream_buf_reset(sb);
2567 
2568  dmsg(D_STREAM_DEBUG, "STREAM: INIT maxlen=%d", sb->maxlen);
2569 }
2570 
2571 static inline void
2573 {
2574  /* set up 'next' for next i/o read */
2575  sb->next = sb->buf;
2576  sb->next.offset = sb->buf.offset + sb->buf.len;
2577  sb->next.len = (sb->len >= 0 ? sb->len : sb->maxlen) - sb->buf.len;
2578  dmsg(D_STREAM_DEBUG, "STREAM: SET NEXT, buf=[%d,%d] next=[%d,%d] len=%d maxlen=%d",
2579  sb->buf.offset, sb->buf.len,
2580  sb->next.offset, sb->next.len,
2581  sb->len, sb->maxlen);
2582  ASSERT(sb->next.len > 0);
2583  ASSERT(buf_safe(&sb->buf, sb->next.len));
2584 }
2585 
2586 static inline void
2587 stream_buf_get_final(struct stream_buf *sb, struct buffer *buf)
2588 {
2589  dmsg(D_STREAM_DEBUG, "STREAM: GET FINAL len=%d",
2590  buf_defined(&sb->buf) ? sb->buf.len : -1);
2591  ASSERT(buf_defined(&sb->buf));
2592  *buf = sb->buf;
2593 }
2594 
2595 static inline void
2596 stream_buf_get_next(struct stream_buf *sb, struct buffer *buf)
2597 {
2598  dmsg(D_STREAM_DEBUG, "STREAM: GET NEXT len=%d",
2599  buf_defined(&sb->next) ? sb->next.len : -1);
2600  ASSERT(buf_defined(&sb->next));
2601  *buf = sb->next;
2602 }
2603 
2604 bool
2606 {
2608  {
2609  ASSERT(buf_copy(&sock->stream_buf.buf, &sock->stream_buf.residual));
2610  ASSERT(buf_init(&sock->stream_buf.residual, 0));
2612  dmsg(D_STREAM_DEBUG, "STREAM: RESIDUAL FULLY FORMED [%s], len=%d",
2613  sock->stream_buf.residual_fully_formed ? "YES" : "NO",
2614  sock->stream_buf.residual.len);
2615  }
2616 
2617  if (!sock->stream_buf.residual_fully_formed)
2618  {
2620  }
2621  return !sock->stream_buf.residual_fully_formed;
2622 }
2623 
2624 static bool
2626  int length_added)
2627 {
2628  dmsg(D_STREAM_DEBUG, "STREAM: ADD length_added=%d", length_added);
2629  if (length_added > 0)
2630  {
2631  sb->buf.len += length_added;
2632  }
2633 
2634  /* if length unknown, see if we can get the length prefix from
2635  * the head of the buffer */
2636  if (sb->len < 0 && sb->buf.len >= (int) sizeof(packet_size_type))
2637  {
2638  packet_size_type net_size;
2639 
2640 #if PORT_SHARE
2641  if (sb->port_share_state == PS_ENABLED)
2642  {
2643  if (!is_openvpn_protocol(&sb->buf))
2644  {
2645  msg(D_STREAM_ERRORS, "Non-OpenVPN client protocol detected");
2646  sb->port_share_state = PS_FOREIGN;
2647  sb->error = true;
2648  return false;
2649  }
2650  else
2651  {
2652  sb->port_share_state = PS_DISABLED;
2653  }
2654  }
2655 #endif
2656 
2657  ASSERT(buf_read(&sb->buf, &net_size, sizeof(net_size)));
2658  sb->len = ntohps(net_size);
2659 
2660  if (sb->len < 1 || sb->len > sb->maxlen)
2661  {
2662  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);
2663  stream_buf_reset(sb);
2664  sb->error = true;
2665  return false;
2666  }
2667  }
2668 
2669  /* is our incoming packet fully read? */
2670  if (sb->len > 0 && sb->buf.len >= sb->len)
2671  {
2672  /* save any residual data that's part of the next packet */
2673  ASSERT(buf_init(&sb->residual, 0));
2674  if (sb->buf.len > sb->len)
2675  {
2676  ASSERT(buf_copy_excess(&sb->residual, &sb->buf, sb->len));
2677  }
2678  dmsg(D_STREAM_DEBUG, "STREAM: ADD returned TRUE, buf_len=%d, residual_len=%d",
2679  BLEN(&sb->buf),
2680  BLEN(&sb->residual));
2681  return true;
2682  }
2683  else
2684  {
2685  dmsg(D_STREAM_DEBUG, "STREAM: ADD returned FALSE (have=%d need=%d)", sb->buf.len, sb->len);
2686  stream_buf_set_next(sb);
2687  return false;
2688  }
2689 }
2690 
2691 static void
2693 {
2694  free_buf(&sb->residual);
2695 }
2696 
2697 /*
2698  * The listen event is a special event whose sole purpose is
2699  * to tell us that there's a new incoming connection on a
2700  * TCP socket, for use in server mode.
2701  */
2702 event_t
2704 {
2705 #ifdef _WIN32
2707  {
2708  init_net_event_win32(&s->listen_handle, FD_ACCEPT, s->sd, 0);
2709  }
2710  return &s->listen_handle;
2711 #else /* ifdef _WIN32 */
2712  return s->sd;
2713 #endif
2714 }
2715 
2716 /*
2717  * Format IP addresses in ascii
2718  */
2719 
2720 const char *
2721 print_sockaddr_ex(const struct sockaddr *sa,
2722  const char *separator,
2723  const unsigned int flags,
2724  struct gc_arena *gc)
2725 {
2726  struct buffer out = alloc_buf_gc(128, gc);
2727  bool addr_is_defined = false;
2728  char hostaddr[NI_MAXHOST] = "";
2729  char servname[NI_MAXSERV] = "";
2730  int status;
2731 
2732  socklen_t salen = 0;
2733  switch (sa->sa_family)
2734  {
2735  case AF_INET:
2736  if (!(flags & PS_DONT_SHOW_FAMILY))
2737  {
2738  buf_puts(&out, "[AF_INET]");
2739  }
2740  salen = sizeof(struct sockaddr_in);
2741  addr_is_defined = ((struct sockaddr_in *) sa)->sin_addr.s_addr != 0;
2742  break;
2743 
2744  case AF_INET6:
2745  if (!(flags & PS_DONT_SHOW_FAMILY))
2746  {
2747  buf_puts(&out, "[AF_INET6]");
2748  }
2749  salen = sizeof(struct sockaddr_in6);
2750  addr_is_defined = !IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) sa)->sin6_addr);
2751  break;
2752 
2753  case AF_UNSPEC:
2754  if (!(flags & PS_DONT_SHOW_FAMILY))
2755  {
2756  return "[AF_UNSPEC]";
2757  }
2758  else
2759  {
2760  return "";
2761  }
2762 
2763  default:
2764  ASSERT(0);
2765  }
2766 
2767  status = getnameinfo(sa, salen, hostaddr, sizeof(hostaddr),
2768  servname, sizeof(servname), NI_NUMERICHOST | NI_NUMERICSERV);
2769 
2770  if (status!=0)
2771  {
2772  buf_printf(&out,"[nameinfo() err: %s]",gai_strerror(status));
2773  return BSTR(&out);
2774  }
2775 
2776  if (!(flags & PS_DONT_SHOW_ADDR))
2777  {
2778  if (addr_is_defined)
2779  {
2780  buf_puts(&out, hostaddr);
2781  }
2782  else
2783  {
2784  buf_puts(&out, "[undef]");
2785  }
2786  }
2787 
2788  if ((flags & PS_SHOW_PORT) || (flags & PS_SHOW_PORT_IF_DEFINED))
2789  {
2790  if (separator)
2791  {
2792  buf_puts(&out, separator);
2793  }
2794 
2795  buf_puts(&out, servname);
2796  }
2797 
2798  return BSTR(&out);
2799 }
2800 
2801 const char *
2803 {
2805 }
2806 
2807 #ifndef IF_NAMESIZE
2808 #define IF_NAMESIZE 16
2809 #endif
2810 
2811 const char *
2813  const char *separator,
2814  const unsigned int flags,
2815  struct gc_arena *gc)
2816 {
2817  if (act)
2818  {
2819  struct buffer out = alloc_buf_gc(128, gc);
2820  buf_printf(&out, "%s", print_sockaddr_ex(&act->dest.addr.sa, separator, flags, gc));
2821 #if ENABLE_IP_PKTINFO
2822  char ifname[IF_NAMESIZE] = "[undef]";
2823 
2824  if ((flags & PS_SHOW_PKTINFO) && addr_defined_ipi(act))
2825  {
2826  switch (act->dest.addr.sa.sa_family)
2827  {
2828  case AF_INET:
2829  {
2830  struct openvpn_sockaddr sa;
2831  CLEAR(sa);
2832  sa.addr.in4.sin_family = AF_INET;
2833 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
2834  sa.addr.in4.sin_addr = act->pi.in4.ipi_spec_dst;
2835  if_indextoname(act->pi.in4.ipi_ifindex, ifname);
2836 #elif defined(IP_RECVDSTADDR)
2837  sa.addr.in4.sin_addr = act->pi.in4;
2838  ifname[0] = 0;
2839 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
2840 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
2841 #endif
2842  buf_printf(&out, " (via %s%%%s)",
2843  print_sockaddr_ex(&sa.addr.sa, separator, 0, gc),
2844  ifname);
2845  }
2846  break;
2847 
2848  case AF_INET6:
2849  {
2850  struct sockaddr_in6 sin6;
2851  char buf[INET6_ADDRSTRLEN] = "[undef]";
2852  CLEAR(sin6);
2853  sin6.sin6_family = AF_INET6;
2854  sin6.sin6_addr = act->pi.in6.ipi6_addr;
2855  if_indextoname(act->pi.in6.ipi6_ifindex, ifname);
2856  if (getnameinfo((struct sockaddr *)&sin6, sizeof(struct sockaddr_in6),
2857  buf, sizeof(buf), NULL, 0, NI_NUMERICHOST) == 0)
2858  {
2859  buf_printf(&out, " (via %s%%%s)", buf, ifname);
2860  }
2861  else
2862  {
2863  buf_printf(&out, " (via [getnameinfo() err]%%%s)", ifname);
2864  }
2865  }
2866  break;
2867  }
2868  }
2869 #endif /* if ENABLE_IP_PKTINFO */
2870  return BSTR(&out);
2871  }
2872  else
2873  {
2874  return "[NULL]";
2875  }
2876 }
2877 
2878 /*
2879  * Convert an in_addr_t in host byte order
2880  * to an ascii dotted quad.
2881  */
2882 const char *
2883 print_in_addr_t(in_addr_t addr, unsigned int flags, struct gc_arena *gc)
2884 {
2885  struct in_addr ia;
2886  struct buffer out = alloc_buf_gc(64, gc);
2887 
2888  if (addr || !(flags & IA_EMPTY_IF_UNDEF))
2889  {
2890  CLEAR(ia);
2891  ia.s_addr = (flags & IA_NET_ORDER) ? addr : htonl(addr);
2892 
2893  buf_printf(&out, "%s", inet_ntoa(ia));
2894  }
2895  return BSTR(&out);
2896 }
2897 
2898 /*
2899  * Convert an in6_addr in host byte order
2900  * to an ascii representation of an IPv6 address
2901  */
2902 const char *
2903 print_in6_addr(struct in6_addr a6, unsigned int flags, struct gc_arena *gc)
2904 {
2905  struct buffer out = alloc_buf_gc(64, gc);
2906  char tmp_out_buf[64]; /* inet_ntop wants pointer to buffer */
2907 
2908  if (memcmp(&a6, &in6addr_any, sizeof(a6)) != 0
2909  || !(flags & IA_EMPTY_IF_UNDEF))
2910  {
2911  inet_ntop(AF_INET6, &a6, tmp_out_buf, sizeof(tmp_out_buf)-1);
2912  buf_printf(&out, "%s", tmp_out_buf );
2913  }
2914  return BSTR(&out);
2915 }
2916 
2917 #ifndef UINT8_MAX
2918 #define UINT8_MAX 0xff
2919 #endif
2920 
2921 /* add some offset to an ipv6 address
2922  * (add in steps of 8 bits, taking overflow into next round)
2923  */
2924 struct in6_addr
2925 add_in6_addr( struct in6_addr base, uint32_t add )
2926 {
2927  int i;
2928 
2929  for (i = 15; i>=0 && add > 0; i--)
2930  {
2931  register int carry;
2932  register uint32_t h;
2933 
2934  h = (unsigned char) base.s6_addr[i];
2935  base.s6_addr[i] = (h+add) & UINT8_MAX;
2936 
2937  /* using explicit carry for the 8-bit additions will catch
2938  * 8-bit and(!) 32-bit overruns nicely
2939  */
2940  carry = ((h & 0xff) + (add & 0xff)) >> 8;
2941  add = (add>>8) + carry;
2942  }
2943  return base;
2944 }
2945 
2946 /* set environmental variables for ip/port in *addr */
2947 void
2948 setenv_sockaddr(struct env_set *es, const char *name_prefix, const struct openvpn_sockaddr *addr, const unsigned int flags)
2949 {
2950  char name_buf[256];
2951 
2952  char buf[128];
2953  switch (addr->addr.sa.sa_family)
2954  {
2955  case AF_INET:
2956  if (flags & SA_IP_PORT)
2957  {
2958  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip", name_prefix);
2959  }
2960  else
2961  {
2962  openvpn_snprintf(name_buf, sizeof(name_buf), "%s", name_prefix);
2963  }
2964 
2965  setenv_str(es, name_buf, inet_ntoa(addr->addr.in4.sin_addr));
2966 
2967  if ((flags & SA_IP_PORT) && addr->addr.in4.sin_port)
2968  {
2969  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_port", name_prefix);
2970  setenv_int(es, name_buf, ntohs(addr->addr.in4.sin_port));
2971  }
2972  break;
2973 
2974  case AF_INET6:
2975  if (IN6_IS_ADDR_V4MAPPED( &addr->addr.in6.sin6_addr ))
2976  {
2977  struct in_addr ia;
2978  memcpy(&ia.s_addr, &addr->addr.in6.sin6_addr.s6_addr[12],
2979  sizeof(ia.s_addr));
2980  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip", name_prefix);
2981  openvpn_snprintf(buf, sizeof(buf), "%s", inet_ntoa(ia) );
2982  }
2983  else
2984  {
2985  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_ip6", name_prefix);
2986  getnameinfo(&addr->addr.sa, sizeof(struct sockaddr_in6),
2987  buf, sizeof(buf), NULL, 0, NI_NUMERICHOST);
2988  }
2989  setenv_str(es, name_buf, buf);
2990 
2991  if ((flags & SA_IP_PORT) && addr->addr.in6.sin6_port)
2992  {
2993  openvpn_snprintf(name_buf, sizeof(name_buf), "%s_port", name_prefix);
2994  setenv_int(es, name_buf, ntohs(addr->addr.in6.sin6_port));
2995  }
2996  break;
2997  }
2998 }
2999 
3000 void
3001 setenv_in_addr_t(struct env_set *es, const char *name_prefix, in_addr_t addr, const unsigned int flags)
3002 {
3003  if (addr || !(flags & SA_SET_IF_NONZERO))
3004  {
3005  struct openvpn_sockaddr si;
3006  CLEAR(si);
3007  si.addr.in4.sin_family = AF_INET;
3008  si.addr.in4.sin_addr.s_addr = htonl(addr);
3009  setenv_sockaddr(es, name_prefix, &si, flags);
3010  }
3011 }
3012 
3013 void
3015  const char *name_prefix,
3016  const struct in6_addr *addr,
3017  const unsigned int flags)
3018 {
3019  if (!IN6_IS_ADDR_UNSPECIFIED(addr) || !(flags & SA_SET_IF_NONZERO))
3020  {
3021  struct openvpn_sockaddr si;
3022  CLEAR(si);
3023  si.addr.in6.sin6_family = AF_INET6;
3024  si.addr.in6.sin6_addr = *addr;
3025  setenv_sockaddr(es, name_prefix, &si, flags);
3026  }
3027 }
3028 
3029 void
3031  const char *name_prefix,
3032  const struct link_socket_actual *act,
3033  const unsigned int flags)
3034 {
3035  setenv_sockaddr(es, name_prefix, &act->dest, flags);
3036 }
3037 
3038 /*
3039  * Convert protocol names between index and ascii form.
3040  */
3041 
3042 struct proto_names {
3043  const char *short_form;
3044  const char *display_form;
3046  int proto;
3047 };
3048 
3049 /* Indexed by PROTO_x */
3050 static const struct proto_names proto_names[] = {
3051  {"proto-uninitialized", "proto-NONE", AF_UNSPEC, PROTO_NONE},
3052  /* try IPv4 and IPv6 (client), bind dual-stack (server) */
3053  {"udp", "UDP", AF_UNSPEC, PROTO_UDP},
3054  {"tcp-server", "TCP_SERVER", AF_UNSPEC, PROTO_TCP_SERVER},
3055  {"tcp-client", "TCP_CLIENT", AF_UNSPEC, PROTO_TCP_CLIENT},
3056  {"tcp", "TCP", AF_UNSPEC, PROTO_TCP},
3057  /* force IPv4 */
3058  {"udp4", "UDPv4", AF_INET, PROTO_UDP},
3059  {"tcp4-server", "TCPv4_SERVER", AF_INET, PROTO_TCP_SERVER},
3060  {"tcp4-client", "TCPv4_CLIENT", AF_INET, PROTO_TCP_CLIENT},
3061  {"tcp4", "TCPv4", AF_INET, PROTO_TCP},
3062  /* force IPv6 */
3063  {"udp6", "UDPv6", AF_INET6, PROTO_UDP},
3064  {"tcp6-server", "TCPv6_SERVER", AF_INET6, PROTO_TCP_SERVER},
3065  {"tcp6-client", "TCPv6_CLIENT", AF_INET6, PROTO_TCP_CLIENT},
3066  {"tcp6", "TCPv6", AF_INET6, PROTO_TCP},
3067 };
3068 
3069 int
3070 ascii2proto(const char *proto_name)
3071 {
3072  int i;
3073  for (i = 0; i < SIZE(proto_names); ++i)
3074  {
3075  if (!strcmp(proto_name, proto_names[i].short_form))
3076  {
3077  return proto_names[i].proto;
3078  }
3079  }
3080  return -1;
3081 }
3082 
3084 ascii2af(const char *proto_name)
3085 {
3086  int i;
3087  for (i = 0; i < SIZE(proto_names); ++i)
3088  {
3089  if (!strcmp(proto_name, proto_names[i].short_form))
3090  {
3091  return proto_names[i].proto_af;
3092  }
3093  }
3094  return 0;
3095 }
3096 
3097 const char *
3099 {
3100  unsigned int i;
3101  for (i = 0; i < SIZE(proto_names); ++i)
3102  {
3103  if (proto_names[i].proto_af == af && proto_names[i].proto == proto)
3104  {
3105  if (display_form)
3106  {
3107  return proto_names[i].display_form;
3108  }
3109  else
3110  {
3111  return proto_names[i].short_form;
3112  }
3113  }
3114  }
3115 
3116  return "[unknown protocol]";
3117 }
3118 
3119 const char *
3121 {
3122  struct buffer out = alloc_buf_gc(256, gc);
3123  int i;
3124 
3125  for (i = 0; i < SIZE(proto_names); ++i)
3126  {
3127  if (i)
3128  {
3129  buf_printf(&out, " ");
3130  }
3131  buf_printf(&out, "[%s]", proto_names[i].short_form);
3132  }
3133  return BSTR(&out);
3134 }
3135 
3136 const char *
3138 {
3139  switch (af)
3140  {
3141  case AF_INET: return "AF_INET";
3142 
3143  case AF_INET6: return "AF_INET6";
3144  }
3145  return "AF_UNSPEC";
3146 }
3147 
3148 /*
3149  * Given a local proto, return local proto
3150  * if !remote, or compatible remote proto
3151  * if remote.
3152  *
3153  * This is used for options compatibility
3154  * checking.
3155  *
3156  * IPv6 and IPv4 protocols are comptabile but OpenVPN
3157  * has always sent UDPv4, TCPv4 over the wire. Keep these
3158  * strings for backward compatibility
3159  */
3160 const char *
3161 proto_remote(int proto, bool remote)
3162 {
3163  ASSERT(proto >= 0 && proto < PROTO_N);
3164  if (proto == PROTO_UDP)
3165  {
3166  return "UDPv4";
3167  }
3168 
3169  if ( (remote && proto == PROTO_TCP_CLIENT)
3170  || (!remote && proto == PROTO_TCP_SERVER))
3171  {
3172  return "TCPv4_SERVER";
3173  }
3174  if ( (remote && proto == PROTO_TCP_SERVER)
3175  || (!remote && proto == PROTO_TCP_CLIENT))
3176  {
3177  return "TCPv4_CLIENT";
3178  }
3179 
3180  ASSERT(0);
3181  return ""; /* Make the compiler happy */
3182 }
3183 
3184 /*
3185  * Bad incoming address lengths that differ from what
3186  * we expect are considered to be fatal errors.
3187  */
3188 void
3189 bad_address_length(int actual, int expected)
3190 {
3191  msg(M_FATAL, "ERROR: received strange incoming packet with an address length of %d -- we only accept address lengths of %d.",
3192  actual,
3193  expected);
3194 }
3195 
3196 /*
3197  * Socket Read Routines
3198  */
3199 
3200 int
3202  struct buffer *buf)
3203 {
3204  int len = 0;
3205 
3206  if (!sock->stream_buf.residual_fully_formed)
3207  {
3208 #ifdef _WIN32
3209  len = socket_finalize(sock->sd, &sock->reads, buf, NULL);
3210 #else
3211  struct buffer frag;
3212  stream_buf_get_next(&sock->stream_buf, &frag);
3213  len = recv(sock->sd, BPTR(&frag), BLEN(&frag), MSG_NOSIGNAL);
3214 #endif
3215 
3216  if (!len)
3217  {
3218  sock->stream_reset = true;
3219  }
3220  if (len <= 0)
3221  {
3222  return buf->len = len;
3223  }
3224  }
3225 
3227  || stream_buf_added(&sock->stream_buf, len)) /* packet complete? */
3228  {
3229  stream_buf_get_final(&sock->stream_buf, buf);
3230  stream_buf_reset(&sock->stream_buf);
3231  return buf->len;
3232  }
3233  else
3234  {
3235  return buf->len = 0; /* no error, but packet is still incomplete */
3236  }
3237 }
3238 
3239 #ifndef _WIN32
3240 
3241 #if ENABLE_IP_PKTINFO
3242 
3243 /* make the buffer large enough to handle ancillary socket data for
3244  * both IPv4 and IPv6 destination addresses, plus padding (see RFC 2292)
3245  */
3246 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3247 #define PKTINFO_BUF_SIZE max_int( CMSG_SPACE(sizeof(struct in6_pktinfo)), \
3248  CMSG_SPACE(sizeof(struct in_pktinfo)) )
3249 #else
3250 #define PKTINFO_BUF_SIZE max_int( CMSG_SPACE(sizeof(struct in6_pktinfo)), \
3251  CMSG_SPACE(sizeof(struct in_addr)) )
3252 #endif
3253 
3254 static socklen_t
3255 link_socket_read_udp_posix_recvmsg(struct link_socket *sock,
3256  struct buffer *buf,
3257  struct link_socket_actual *from)
3258 {
3259  struct iovec iov;
3260  uint8_t pktinfo_buf[PKTINFO_BUF_SIZE];
3261  struct msghdr mesg;
3262  socklen_t fromlen = sizeof(from->dest.addr);
3263 
3264  iov.iov_base = BPTR(buf);
3265  iov.iov_len = buf_forward_capacity_total(buf);
3266  mesg.msg_iov = &iov;
3267  mesg.msg_iovlen = 1;
3268  mesg.msg_name = &from->dest.addr;
3269  mesg.msg_namelen = fromlen;
3270  mesg.msg_control = pktinfo_buf;
3271  mesg.msg_controllen = sizeof pktinfo_buf;
3272  buf->len = recvmsg(sock->sd, &mesg, 0);
3273  if (buf->len >= 0)
3274  {
3275  struct cmsghdr *cmsg;
3276  fromlen = mesg.msg_namelen;
3277  cmsg = CMSG_FIRSTHDR(&mesg);
3278  if (cmsg != NULL
3279  && CMSG_NXTHDR(&mesg, cmsg) == NULL
3280 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3281  && cmsg->cmsg_level == SOL_IP
3282  && cmsg->cmsg_type == IP_PKTINFO
3283  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in_pktinfo)) )
3284 #elif defined(IP_RECVDSTADDR)
3285  && cmsg->cmsg_level == IPPROTO_IP
3286  && cmsg->cmsg_type == IP_RECVDSTADDR
3287  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in_addr)) )
3288 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3289 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3290 #endif
3291  {
3292 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3293  struct in_pktinfo *pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
3294  from->pi.in4.ipi_ifindex = pkti->ipi_ifindex;
3295  from->pi.in4.ipi_spec_dst = pkti->ipi_spec_dst;
3296 #elif defined(IP_RECVDSTADDR)
3297  from->pi.in4 = *(struct in_addr *) CMSG_DATA(cmsg);
3298 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3299 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3300 #endif
3301  }
3302  else if (cmsg != NULL
3303  && CMSG_NXTHDR(&mesg, cmsg) == NULL
3304  && cmsg->cmsg_level == IPPROTO_IPV6
3305  && cmsg->cmsg_type == IPV6_PKTINFO
3306  && cmsg->cmsg_len >= CMSG_LEN(sizeof(struct in6_pktinfo)) )
3307  {
3308  struct in6_pktinfo *pkti6 = (struct in6_pktinfo *) CMSG_DATA(cmsg);
3309  from->pi.in6.ipi6_ifindex = pkti6->ipi6_ifindex;
3310  from->pi.in6.ipi6_addr = pkti6->ipi6_addr;
3311  }
3312  else if (cmsg != NULL)
3313  {
3314  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 );
3315  }
3316  }
3317 
3318  return fromlen;
3319 }
3320 #endif /* if ENABLE_IP_PKTINFO */
3321 
3322 int
3323 link_socket_read_udp_posix(struct link_socket *sock,
3324  struct buffer *buf,
3325  struct link_socket_actual *from)
3326 {
3327  socklen_t fromlen = sizeof(from->dest.addr);
3328  socklen_t expectedlen = af_addr_size(sock->info.af);
3329  addr_zero_host(&from->dest);
3330 #if ENABLE_IP_PKTINFO
3331  /* Both PROTO_UDPv4 and PROTO_UDPv6 */
3332  if (sock->info.proto == PROTO_UDP && sock->sockflags & SF_USE_IP_PKTINFO)
3333  {
3334  fromlen = link_socket_read_udp_posix_recvmsg(sock, buf, from);
3335  }
3336  else
3337 #endif
3338  buf->len = recvfrom(sock->sd, BPTR(buf), buf_forward_capacity(buf), 0,
3339  &from->dest.addr.sa, &fromlen);
3340  /* FIXME: won't do anything when sock->info.af == AF_UNSPEC */
3341  if (buf->len >= 0 && expectedlen && fromlen != expectedlen)
3342  {
3343  bad_address_length(fromlen, expectedlen);
3344  }
3345  return buf->len;
3346 }
3347 
3348 #endif /* ifndef _WIN32 */
3349 
3350 /*
3351  * Socket Write Routines
3352  */
3353 
3354 int
3356  struct buffer *buf,
3357  struct link_socket_actual *to)
3358 {
3359  packet_size_type len = BLEN(buf);
3360  dmsg(D_STREAM_DEBUG, "STREAM: WRITE %d offset=%d", (int)len, buf->offset);
3361  ASSERT(len <= sock->stream_buf.maxlen);
3362  len = htonps(len);
3363  ASSERT(buf_write_prepend(buf, &len, sizeof(len)));
3364 #ifdef _WIN32
3365  return link_socket_write_win32(sock, buf, to);
3366 #else
3367  return link_socket_write_tcp_posix(sock, buf, to);
3368 #endif
3369 }
3370 
3371 #if ENABLE_IP_PKTINFO
3372 
3373 size_t
3374 link_socket_write_udp_posix_sendmsg(struct link_socket *sock,
3375  struct buffer *buf,
3376  struct link_socket_actual *to)
3377 {
3378  struct iovec iov;
3379  struct msghdr mesg;
3380  struct cmsghdr *cmsg;
3381  uint8_t pktinfo_buf[PKTINFO_BUF_SIZE];
3382 
3383  iov.iov_base = BPTR(buf);
3384  iov.iov_len = BLEN(buf);
3385  mesg.msg_iov = &iov;
3386  mesg.msg_iovlen = 1;
3387  switch (to->dest.addr.sa.sa_family)
3388  {
3389  case AF_INET:
3390  {
3391  mesg.msg_name = &to->dest.addr.sa;
3392  mesg.msg_namelen = sizeof(struct sockaddr_in);
3393  mesg.msg_control = pktinfo_buf;
3394  mesg.msg_flags = 0;
3395 #if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST)
3396  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo));
3397  cmsg = CMSG_FIRSTHDR(&mesg);
3398  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
3399  cmsg->cmsg_level = SOL_IP;
3400  cmsg->cmsg_type = IP_PKTINFO;
3401  {
3402  struct in_pktinfo *pkti;
3403  pkti = (struct in_pktinfo *) CMSG_DATA(cmsg);
3404  pkti->ipi_ifindex = to->pi.in4.ipi_ifindex;
3405  pkti->ipi_spec_dst = to->pi.in4.ipi_spec_dst;
3406  pkti->ipi_addr.s_addr = 0;
3407  }
3408 #elif defined(IP_RECVDSTADDR)
3409  ASSERT( CMSG_SPACE(sizeof(struct in_addr)) <= sizeof(pktinfo_buf) );
3410  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in_addr));
3411  cmsg = CMSG_FIRSTHDR(&mesg);
3412  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
3413  cmsg->cmsg_level = IPPROTO_IP;
3414  cmsg->cmsg_type = IP_RECVDSTADDR;
3415  *(struct in_addr *) CMSG_DATA(cmsg) = to->pi.in4;
3416 #else /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3417 #error ENABLE_IP_PKTINFO is set without IP_PKTINFO xor IP_RECVDSTADDR (fix syshead.h)
3418 #endif /* if defined(HAVE_IN_PKTINFO) && defined(HAVE_IPI_SPEC_DST) */
3419  break;
3420  }
3421 
3422  case AF_INET6:
3423  {
3424  struct in6_pktinfo *pkti6;
3425  mesg.msg_name = &to->dest.addr.sa;
3426  mesg.msg_namelen = sizeof(struct sockaddr_in6);
3427 
3428  ASSERT( CMSG_SPACE(sizeof(struct in6_pktinfo)) <= sizeof(pktinfo_buf) );
3429  mesg.msg_control = pktinfo_buf;
3430  mesg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
3431  mesg.msg_flags = 0;
3432  cmsg = CMSG_FIRSTHDR(&mesg);
3433  cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
3434  cmsg->cmsg_level = IPPROTO_IPV6;
3435  cmsg->cmsg_type = IPV6_PKTINFO;
3436 
3437  pkti6 = (struct in6_pktinfo *) CMSG_DATA(cmsg);
3438  pkti6->ipi6_ifindex = to->pi.in6.ipi6_ifindex;
3439  pkti6->ipi6_addr = to->pi.in6.ipi6_addr;
3440  break;
3441  }
3442 
3443  default: ASSERT(0);
3444  }
3445  return sendmsg(sock->sd, &mesg, 0);
3446 }
3447 
3448 #endif /* if ENABLE_IP_PKTINFO */
3449 
3450 /*
3451  * Win32 overlapped socket I/O functions.
3452  */
3453 
3454 #ifdef _WIN32
3455 
3456 int
3457 socket_recv_queue(struct link_socket *sock, int maxsize)
3458 {
3459  if (sock->reads.iostate == IOSTATE_INITIAL)
3460  {
3461  WSABUF wsabuf[1];
3462  int status;
3463 
3464  /* reset buf to its initial state */
3465  if (proto_is_udp(sock->info.proto))
3466  {
3467  sock->reads.buf = sock->reads.buf_init;
3468  }
3469  else if (proto_is_tcp(sock->info.proto))
3470  {
3471  stream_buf_get_next(&sock->stream_buf, &sock->reads.buf);
3472  }
3473  else
3474  {
3475  ASSERT(0);
3476  }
3477 
3478  /* Win32 docs say it's okay to allocate the wsabuf on the stack */
3479  wsabuf[0].buf = BSTR(&sock->reads.buf);
3480  wsabuf[0].len = maxsize ? maxsize : BLEN(&sock->reads.buf);
3481 
3482  /* check for buffer overflow */
3483  ASSERT(wsabuf[0].len <= BLEN(&sock->reads.buf));
3484 
3485  /* the overlapped read will signal this event on I/O completion */
3486  ASSERT(ResetEvent(sock->reads.overlapped.hEvent));
3487  sock->reads.flags = 0;
3488 
3489  if (proto_is_udp(sock->info.proto))
3490  {
3491  sock->reads.addr_defined = true;
3492  sock->reads.addrlen = sizeof(sock->reads.addr6);
3493  status = WSARecvFrom(
3494  sock->sd,
3495  wsabuf,
3496  1,
3497  &sock->reads.size,
3498  &sock->reads.flags,
3499  (struct sockaddr *) &sock->reads.addr,
3500  &sock->reads.addrlen,
3501  &sock->reads.overlapped,
3502  NULL);
3503  }
3504  else if (proto_is_tcp(sock->info.proto))
3505  {
3506  sock->reads.addr_defined = false;
3507  status = WSARecv(
3508  sock->sd,
3509  wsabuf,
3510  1,
3511  &sock->reads.size,
3512  &sock->reads.flags,
3513  &sock->reads.overlapped,
3514  NULL);
3515  }
3516  else
3517  {
3518  status = 0;
3519  ASSERT(0);
3520  }
3521 
3522  if (!status) /* operation completed immediately? */
3523  {
3524  /* FIXME: won't do anything when sock->info.af == AF_UNSPEC */
3525  int af_len = af_addr_size(sock->info.af);
3526  if (sock->reads.addr_defined && af_len && sock->reads.addrlen != af_len)
3527  {
3528  bad_address_length(sock->reads.addrlen, af_len);
3529  }
3531 
3532  /* since we got an immediate return, we must signal the event object ourselves */
3533  ASSERT(SetEvent(sock->reads.overlapped.hEvent));
3534  sock->reads.status = 0;
3535 
3536  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive immediate return [%d,%d]",
3537  (int) wsabuf[0].len,
3538  (int) sock->reads.size);
3539  }
3540  else
3541  {
3542  status = WSAGetLastError();
3543  if (status == WSA_IO_PENDING) /* operation queued? */
3544  {
3545  sock->reads.iostate = IOSTATE_QUEUED;
3546  sock->reads.status = status;
3547  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive queued [%d]",
3548  (int) wsabuf[0].len);
3549  }
3550  else /* error occurred */
3551  {
3552  struct gc_arena gc = gc_new();
3553  ASSERT(SetEvent(sock->reads.overlapped.hEvent));
3555  sock->reads.status = status;
3556  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Receive error [%d]: %s",
3557  (int) wsabuf[0].len,
3558  strerror_win32(status, &gc));
3559  gc_free(&gc);
3560  }
3561  }
3562  }
3563  return sock->reads.iostate;
3564 }
3565 
3566 int
3567 socket_send_queue(struct link_socket *sock, struct buffer *buf, const struct link_socket_actual *to)
3568 {
3569  if (sock->writes.iostate == IOSTATE_INITIAL)
3570  {
3571  WSABUF wsabuf[1];
3572  int status;
3573 
3574  /* make a private copy of buf */
3575  sock->writes.buf = sock->writes.buf_init;
3576  sock->writes.buf.len = 0;
3577  ASSERT(buf_copy(&sock->writes.buf, buf));
3578 
3579  /* Win32 docs say it's okay to allocate the wsabuf on the stack */
3580  wsabuf[0].buf = BSTR(&sock->writes.buf);
3581  wsabuf[0].len = BLEN(&sock->writes.buf);
3582 
3583  /* the overlapped write will signal this event on I/O completion */
3584  ASSERT(ResetEvent(sock->writes.overlapped.hEvent));
3585  sock->writes.flags = 0;
3586 
3587  if (proto_is_udp(sock->info.proto))
3588  {
3589  /* set destination address for UDP writes */
3590  sock->writes.addr_defined = true;
3591  if (to->dest.addr.sa.sa_family == AF_INET6)
3592  {
3593  sock->writes.addr6 = to->dest.addr.in6;
3594  sock->writes.addrlen = sizeof(sock->writes.addr6);
3595  }
3596  else
3597  {
3598  sock->writes.addr = to->dest.addr.in4;
3599  sock->writes.addrlen = sizeof(sock->writes.addr);
3600  }
3601 
3602  status = WSASendTo(
3603  sock->sd,
3604  wsabuf,
3605  1,
3606  &sock->writes.size,
3607  sock->writes.flags,
3608  (struct sockaddr *) &sock->writes.addr,
3609  sock->writes.addrlen,
3610  &sock->writes.overlapped,
3611  NULL);
3612  }
3613  else if (proto_is_tcp(sock->info.proto))
3614  {
3615  /* destination address for TCP writes was established on connection initiation */
3616  sock->writes.addr_defined = false;
3617 
3618  status = WSASend(
3619  sock->sd,
3620  wsabuf,
3621  1,
3622  &sock->writes.size,
3623  sock->writes.flags,
3624  &sock->writes.overlapped,
3625  NULL);
3626  }
3627  else
3628  {
3629  status = 0;
3630  ASSERT(0);
3631  }
3632 
3633  if (!status) /* operation completed immediately? */
3634  {
3636 
3637  /* since we got an immediate return, we must signal the event object ourselves */
3638  ASSERT(SetEvent(sock->writes.overlapped.hEvent));
3639 
3640  sock->writes.status = 0;
3641 
3642  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send immediate return [%d,%d]",
3643  (int) wsabuf[0].len,
3644  (int) sock->writes.size);
3645  }
3646  else
3647  {
3648  status = WSAGetLastError();
3649  if (status == WSA_IO_PENDING) /* operation queued? */
3650  {
3651  sock->writes.iostate = IOSTATE_QUEUED;
3652  sock->writes.status = status;
3653  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send queued [%d]",
3654  (int) wsabuf[0].len);
3655  }
3656  else /* error occurred */
3657  {
3658  struct gc_arena gc = gc_new();
3659  ASSERT(SetEvent(sock->writes.overlapped.hEvent));
3661  sock->writes.status = status;
3662 
3663  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Send error [%d]: %s",
3664  (int) wsabuf[0].len,
3665  strerror_win32(status, &gc));
3666 
3667  gc_free(&gc);
3668  }
3669  }
3670  }
3671  return sock->writes.iostate;
3672 }
3673 
3674 int
3676  struct overlapped_io *io,
3677  struct buffer *buf,
3678  struct link_socket_actual *from)
3679 {
3680  int ret = -1;
3681  BOOL status;
3682 
3683  switch (io->iostate)
3684  {
3685  case IOSTATE_QUEUED:
3686  status = WSAGetOverlappedResult(
3687  s,
3688  &io->overlapped,
3689  &io->size,
3690  FALSE,
3691  &io->flags
3692  );
3693  if (status)
3694  {
3695  /* successful return for a queued operation */
3696  if (buf)
3697  {
3698  *buf = io->buf;
3699  }
3700  ret = io->size;
3701  io->iostate = IOSTATE_INITIAL;
3702  ASSERT(ResetEvent(io->overlapped.hEvent));
3703 
3704  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion success [%d]", ret);
3705  }
3706  else
3707  {
3708  /* error during a queued operation */
3709  ret = -1;
3710  if (WSAGetLastError() != WSA_IO_INCOMPLETE)
3711  {
3712  /* if no error (i.e. just not finished yet), then DON'T execute this code */
3713  io->iostate = IOSTATE_INITIAL;
3714  ASSERT(ResetEvent(io->overlapped.hEvent));
3715  msg(D_WIN32_IO | M_ERRNO, "WIN32 I/O: Socket Completion error");
3716  }
3717  }
3718  break;
3719 
3721  io->iostate = IOSTATE_INITIAL;
3722  ASSERT(ResetEvent(io->overlapped.hEvent));
3723  if (io->status)
3724  {
3725  /* error return for a non-queued operation */
3726  WSASetLastError(io->status);
3727  ret = -1;
3728  msg(D_WIN32_IO | M_ERRNO, "WIN32 I/O: Socket Completion non-queued error");
3729  }
3730  else
3731  {
3732  /* successful return for a non-queued operation */
3733  if (buf)
3734  {
3735  *buf = io->buf;
3736  }
3737  ret = io->size;
3738  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion non-queued success [%d]", ret);
3739  }
3740  break;
3741 
3742  case IOSTATE_INITIAL: /* were we called without proper queueing? */
3743  WSASetLastError(WSAEINVAL);
3744  ret = -1;
3745  dmsg(D_WIN32_IO, "WIN32 I/O: Socket Completion BAD STATE");
3746  break;
3747 
3748  default:
3749  ASSERT(0);
3750  }
3751 
3752  /* return from address if requested */
3753  if (from)
3754  {
3755  if (ret >= 0 && io->addr_defined)
3756  {
3757  /* TODO(jjo): streamline this mess */
3758  /* in this func we don't have relevant info about the PF_ of this
3759  * endpoint, as link_socket_actual will be zero for the 1st received packet
3760  *
3761  * Test for inets PF_ possible sizes
3762  */
3763  switch (io->addrlen)
3764  {
3765  case sizeof(struct sockaddr_in):
3766  case sizeof(struct sockaddr_in6):
3767  /* TODO(jjo): for some reason (?) I'm getting 24,28 for AF_INET6
3768  * under _WIN32*/
3769  case sizeof(struct sockaddr_in6)-4:
3770  break;
3771 
3772  default:
3773  bad_address_length(io->addrlen, af_addr_size(io->addr.sin_family));
3774  }
3775 
3776  switch (io->addr.sin_family)
3777  {
3778  case AF_INET:
3779  from->dest.addr.in4 = io->addr;
3780  break;
3781 
3782  case AF_INET6:
3783  from->dest.addr.in6 = io->addr6;
3784  break;
3785  }
3786  }
3787  else
3788  {
3789  CLEAR(from->dest.addr);
3790  }
3791  }
3792 
3793  if (buf)
3794  {
3795  buf->len = ret;
3796  }
3797  return ret;
3798 }
3799 
3800 #endif /* _WIN32 */
3801 
3802 /*
3803  * Socket event notification
3804  */
3805 
3806 unsigned int
3808  struct event_set *es,
3809  unsigned int rwflags,
3810  void *arg,
3811  unsigned int *persistent)
3812 {
3813  if (s)
3814  {
3815  if ((rwflags & EVENT_READ) && !stream_buf_read_setup(s))
3816  {
3817  ASSERT(!persistent);
3818  rwflags &= ~EVENT_READ;
3819  }
3820 
3821 #ifdef _WIN32
3822  if (rwflags & EVENT_READ)
3823  {
3824  socket_recv_queue(s, 0);
3825  }
3826 #endif
3827 
3828  /* if persistent is defined, call event_ctl only if rwflags has changed since last call */
3829  if (!persistent || *persistent != rwflags)
3830  {
3831  event_ctl(es, socket_event_handle(s), rwflags, arg);
3832  if (persistent)
3833  {
3834  *persistent = rwflags;
3835  }
3836  }
3837 
3838  s->rwflags_debug = rwflags;
3839  }
3840  return rwflags;
3841 }
3842 
3843 void
3845 {
3846  if (sd && socket_defined(*sd))
3847  {
3848  openvpn_close_socket(*sd);
3849  *sd = SOCKET_UNDEFINED;
3850  }
3851 }
3852 
3853 #if UNIX_SOCK_SUPPORT
3854 
3855 /*
3856  * code for unix domain sockets
3857  */
3858 
3859 const char *
3860 sockaddr_unix_name(const struct sockaddr_un *local, const char *null)
3861 {
3862  if (local && local->sun_family == PF_UNIX)
3863  {
3864  return local->sun_path;
3865  }
3866  else
3867  {
3868  return null;
3869  }
3870 }
3871 
3873 create_socket_unix(void)
3874 {
3876 
3877  if ((sd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
3878  {
3879  msg(M_ERR, "Cannot create unix domain socket");
3880  }
3881 
3882  /* set socket file descriptor to not pass across execs, so that
3883  * scripts don't have access to it */
3884  set_cloexec(sd);
3885 
3886  return sd;
3887 }
3888 
3889 void
3890 socket_bind_unix(socket_descriptor_t sd,
3891  struct sockaddr_un *local,
3892  const char *prefix)
3893 {
3894  struct gc_arena gc = gc_new();
3895  const mode_t orig_umask = umask(0);
3896 
3897  if (bind(sd, (struct sockaddr *) local, sizeof(struct sockaddr_un)))
3898  {
3899  msg(M_FATAL | M_ERRNO,
3900  "%s: Socket bind[%d] failed on unix domain socket %s",
3901  prefix,
3902  (int)sd,
3903  sockaddr_unix_name(local, "NULL"));
3904  }
3905 
3906  umask(orig_umask);
3907  gc_free(&gc);
3908 }
3909 
3911 socket_accept_unix(socket_descriptor_t sd,
3912  struct sockaddr_un *remote)
3913 {
3914  socklen_t remote_len = sizeof(struct sockaddr_un);
3915  socket_descriptor_t ret;
3916 
3917  CLEAR(*remote);
3918  ret = accept(sd, (struct sockaddr *) remote, &remote_len);
3919  if (ret >= 0)
3920  {
3921  /* set socket file descriptor to not pass across execs, so that
3922  * scripts don't have access to it */
3923  set_cloexec(ret);
3924  }
3925  return ret;
3926 }
3927 
3928 int
3929 socket_connect_unix(socket_descriptor_t sd,
3930  struct sockaddr_un *remote)
3931 {
3932  int status = connect(sd, (struct sockaddr *) remote, sizeof(struct sockaddr_un));
3933  if (status)
3934  {
3935  status = openvpn_errno();
3936  }
3937  return status;
3938 }
3939 
3940 void
3941 sockaddr_unix_init(struct sockaddr_un *local, const char *path)
3942 {
3943  local->sun_family = PF_UNIX;
3944  strncpynt(local->sun_path, path, sizeof(local->sun_path));
3945 }
3946 
3947 void
3948 socket_delete_unix(const struct sockaddr_un *local)
3949 {
3950  const char *name = sockaddr_unix_name(local, NULL);
3951  if (name && strlen(name))
3952  {
3953  unlink(name);
3954  }
3955 }
3956 
3957 bool
3958 unix_socket_get_peer_uid_gid(const socket_descriptor_t sd, int *uid, int *gid)
3959 {
3960 #ifdef HAVE_GETPEEREID
3961  uid_t u;
3962  gid_t g;
3963  if (getpeereid(sd, &u, &g) == -1)
3964  {
3965  return false;
3966  }
3967  if (uid)
3968  {
3969  *uid = u;
3970  }
3971  if (gid)
3972  {
3973  *gid = g;
3974  }
3975  return true;
3976 #elif defined(SO_PEERCRED)
3977  struct ucred peercred;
3978  socklen_t so_len = sizeof(peercred);
3979  if (getsockopt(sd, SOL_SOCKET, SO_PEERCRED, &peercred, &so_len) == -1)
3980  {
3981  return false;
3982  }
3983  if (uid)
3984  {
3985  *uid = peercred.uid;
3986  }
3987  if (gid)
3988  {
3989  *gid = peercred.gid;
3990  }
3991  return true;
3992 #else /* ifdef HAVE_GETPEEREID */
3993  return false;
3994 #endif /* ifdef HAVE_GETPEEREID */
3995 }
3996 
3997 #endif /* if UNIX_SOCK_SUPPORT */
#define M_NONFATAL
Definition: error.h:95
int status
Definition: win32.h:206
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:494
int sndbuf
Definition: options.h:362
#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:213
#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:106
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:465
#define D_OSBUF
Definition: errlevel.h:91
void free_buf(struct buffer *buf)
Definition: buffer.c:185
HANDLE read
Definition: win32.h:76
struct link_socket * link_socket_new(void)
Definition: socket.c:1847
void init_net_event_win32(struct rw_handle *event, long network_events, socket_descriptor_t sd, unsigned int flags)
Definition: win32.c:218
struct sockaddr_in6 addr6
Definition: win32.h:210
void setenv_trusted(struct env_set *es, const struct link_socket_info *info)
Definition: socket.c:2328
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:74
struct cached_dns_entry * dns_cache
Definition: openvpn.h:163
int len
Definition: socket.h:138
#define streq(x, y)
Definition: options.h:664
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:3084
const char * print_in6_addr(struct in6_addr a6, unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2903
#define M_INFO
Definition: errlevel.h:55
Contains all state information for one tunnel.
Definition: openvpn.h:463
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:165
#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:1296
DWORD size
Definition: win32.h:204
const char * print_link_socket_actual(const struct link_socket_actual *act, struct gc_arena *gc)
Definition: socket.c:2802
static void gc_free(struct gc_arena *a)
Definition: buffer.h:1023
OVERLAPPED overlapped
Definition: win32.h:203
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:104
#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:321
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:2587
int rcvbuf
Definition: options.h:361
struct buffer buf_init
Definition: socket.h:131
struct connection_list * connection_list
Definition: options.h:249
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:241
unsigned int sockflags
Definition: options.h:369
bool buf_printf(struct buffer *buf, const char *format,...)
Definition: buffer.c:242
const char * proto2ascii_all(struct gc_arena *gc)
Definition: socket.c:3120
int resolve_retry_seconds
Definition: options.h:313
#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:155
#define SF_GETADDRINFO_DGRAM
Definition: socket.h:207
#define OPENVPN_STATE_TCP_CONNECT
Definition: manage.h:495
#define SIZE(x)
Definition: basic.h:30
#define D_READ_WRITE
Definition: errlevel.h:165
struct socks_proxy_info * socks_proxy
Definition: openvpn.h:189
#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:1287
#define dmsg(flags,...)
Definition: error.h:153
struct signal_info * sig
Internal error signaling object.
Definition: openvpn.h:490
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:209
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:200
struct buffer residual
Definition: socket.h:132
const char * display_form
Definition: socket.c:3044
#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:98
int ascii2proto(const char *proto_name)
Definition: socket.c:3070
#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:272
int proto
Definition: socket.c:3046
const char * proto_remote(int proto, bool remote)
Definition: socket.c:3161
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:2070
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:2401
#define OIA_IP
Definition: socket.h:424
#define openvpn_close_socket(s)
Definition: socket.h:257
int iostate
Definition: win32.h:202
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:503
#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:2692
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:3457
int socket_finalize(SOCKET s, struct overlapped_io *io, struct buffer *buf, struct link_socket_actual *from)
Definition: socket.c:3675
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:1562
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:3030
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:2812
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:201
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:2430
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:2334
const char * print_in_addr_t(in_addr_t addr, unsigned int flags, struct gc_arena *gc)
Definition: socket.c:2883
int get_server_poll_remaining_time(struct event_timeout *server_poll_timeout)
Definition: forward.c:419
struct frame frame
Definition: openvpn.h:247
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:3045
static void stream_buf_get_next(struct stream_buf *sb, struct buffer *buf)
Definition: socket.c:2596
#define IOSTATE_QUEUED
Definition: win32.h:200
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:212
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:2948
void overlapped_io_close(struct overlapped_io *o)
Definition: win32.c:184
bool stream_buf_read_setup_dowork(struct link_socket *sock)
Definition: socket.c:2605
static bool defined_net_event_win32(const struct rw_handle *event)
Definition: win32.h:88
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:1987
static int buf_forward_capacity(const struct buffer *buf)
Definition: buffer.h:562
#define D_SOCKET_DEBUG
Definition: errlevel.h:138
int link_socket_write_tcp(struct link_socket *sock, struct buffer *buf, struct link_socket_actual *to)
Definition: socket.c:3355
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:1389
const struct in6_addr * link_socket_current_remote_ipv6(const struct link_socket_info *info)
Definition: socket.c:2471
struct buffer buf
Definition: socket.h:136
union openvpn_sockaddr::@10 addr
void sd_close(socket_descriptor_t *sd)
Definition: socket.c:3844
struct link_socket * link_socket
Definition: openvpn.h:238
static bool buf_copy(struct buffer *dest, const struct buffer *src)
Definition: buffer.h:734
#define M_ERRNO
Definition: error.h:99
struct buffer buf
Definition: win32.h:214
const char * socket_stat(const struct link_socket *s, unsigned int rwflags, struct gc_arena *gc)
Definition: socket.c:2504
static bool stream_buf_added(struct stream_buf *sb, int length_added)
Definition: socket.c:2625
static void resolve_remote(struct link_socket *sock, int phase, const char **remote_dynamic, volatile int *signal_received)
Definition: socket.c:1719
#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:1968
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:2541
struct connection_entry ce
Definition: options.h:248
struct context_2 c2
Level 2 context.
Definition: openvpn.h:504
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:816
char * overlapped_io_state_ascii(const struct overlapped_io *o)
Definition: win32.c:197
#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:264
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:1636
const char * remote_port
Definition: options.h:102
void link_socket_init_phase1(struct context *c, int mode)
Definition: socket.c:1858
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:149
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:1443
static bool buf_defined(const struct buffer *buf)
Definition: buffer.h:215
const char * ip_remote_hint
Definition: options.h:315
#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:2721
HANDLE write
Definition: win32.h:77
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:3807
void setenv_in6_addr(struct env_set *es, const char *name_prefix, const struct in6_addr *addr, const unsigned int flags)
Definition: socket.c:3014
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:366
uint16_t packet_size_type
Definition: socket.h:55
#define M_ERR
Definition: error.h:110
bool plugin_defined(const struct plugin_list *pl, const int type)
Definition: plugin.c:901
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:3189
#define GETADDR_FATAL
Definition: socket.h:472
void link_socket_init_phase2(struct context *c)
Definition: socket.c:2153
void socket_adjust_frame_parameters(struct frame *frame, int proto)
Definition: socket.c:2319
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:170
#define IF_NAMESIZE
Definition: socket.c:2808
static void phase2_socks_client(struct link_socket *sock, struct signal_info *sig_info)
Definition: socket.c:2114
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:207
Wrapper structure for dynamically allocated memory.
Definition: buffer.h:60
#define M_FATAL
Definition: error.h:94
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:1539
DWORD flags
Definition: win32.h:205
int link_socket_read_tcp(struct link_socket *sock, struct buffer *buf)
Definition: socket.c:3201
void frame_adjust_path_mtu(struct frame *frame, int pmtu, int proto)
Definition: socket.c:1671
#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:492
struct http_proxy_info * http_proxy
Definition: openvpn.h:185
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:2718
struct event_timeout server_poll_interval
Definition: openvpn.h:395
#define IOSTATE_INITIAL
Definition: win32.h:199
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:2029
static void resolve_bind_local(struct link_socket *sock, const sa_family_t af)
Definition: socket.c:1677
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:96
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:4096
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:482
static bool addr_local(const struct sockaddr *addr)
Definition: socket.h:637
#define UINT8_MAX
Definition: socket.c:2918
void link_socket_close(struct link_socket *sock)
Definition: socket.c:2266
#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:2703
int socket_send_queue(struct link_socket *sock, struct buffer *buf, const struct link_socket_actual *to)
Definition: socket.c:3567
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:3098
void setenv_in_addr_t(struct env_set *es, const char *name_prefix, in_addr_t addr, const unsigned int flags)
Definition: socket.c:3001
#define D_WIN32_IO
Definition: errlevel.h:171
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:2572
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:2350
#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:2551
#define GETADDR_RESOLVE
Definition: socket.h:471
const char * short_form
Definition: socket.c:3043
#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:365
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:2925
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:2436
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:3137
static bool socket_set_rcvbuf(socket_descriptor_t sd, int size)
Definition: socket.c:894