1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2004-2006 the VideoLAN team
5 * Copyright © 2006-2007 Rémi Denis-Courmont
9 * Authors: Laurent Aimar <fenrir@videolan.org>
10 * Rémi Denis-Courmont <rem # videolan.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
34 #include <vlc_common.h>
38 #include <vlc_network.h>
41 # if defined(UNDER_CE)
42 # undef IP_MULTICAST_TTL
43 # define IP_MULTICAST_TTL 3
44 # undef IP_ADD_MEMBERSHIP
45 # define IP_ADD_MEMBERSHIP 5
47 # define EAFNOSUPPORT WSAEAFNOSUPPORT
48 # define if_nametoindex( str ) atoi( str )
56 #ifdef HAVE_LINUX_DCCP_H
57 # include <linux/dccp.h>
58 # ifndef SOCK_DCCP /* provisional API */
64 # define SOL_IP IPPROTO_IP
67 # define SOL_IPV6 IPPROTO_IPV6
70 # define IPPROTO_IPV6 41 /* IANA */
73 # define SOL_DCCP IPPROTO_DCCP
76 # define IPPROTO_DCCP 33 /* IANA */
79 # define SOL_UDPLITE IPPROTO_UDPLITE
81 #ifndef IPPROTO_UDPLITE
82 # define IPPROTO_UDPLITE 136 /* IANA */
85 #if defined (HAVE_NETINET_UDPLITE_H)
86 # include <netinet/udplite.h>
87 #elif defined (__linux__)
88 /* still missing from glibc 2.6 */
89 # define UDPLITE_SEND_CSCOV 10
90 # define UDPLITE_RECV_CSCOV 11
93 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
97 static int net_SetupDgramSocket( vlc_object_t *p_obj, int fd, const struct addrinfo *ptr )
100 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
104 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
105 * to avoid packet loss caused in case of scheduling hiccups */
106 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
107 (void *)&(int){ 0x80000 }, sizeof (int));
108 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
109 (void *)&(int){ 0x80000 }, sizeof (int));
112 #if defined (WIN32) || defined (UNDER_CE)
113 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
114 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
116 // This works for IPv4 too - don't worry!
117 struct sockaddr_in6 dumb =
119 .sin6_family = ptr->ai_addr->sa_family,
120 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
123 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
127 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
129 msg_Err( p_obj, "socket bind error (%m)" );
137 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
138 int family, int protocol)
140 struct addrinfo hints, *res;
142 memset (&hints, 0, sizeof( hints ));
143 hints.ai_family = family;
144 hints.ai_socktype = SOCK_DGRAM;
145 hints.ai_protocol = protocol;
146 hints.ai_flags = AI_PASSIVE;
151 msg_Dbg (obj, "net: opening %s datagram port %d",
152 host ? host : "any", port);
154 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
157 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
158 vlc_gai_strerror (val));
164 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
166 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
170 msg_Dbg (obj, "socket error: %m");
175 /* If IPv6 was forced, set IPv6-only mode.
176 * If IPv4 was forced, do nothing extraordinary.
177 * If nothing was forced, try dual-mode IPv6. */
178 if (ptr->ai_family == AF_INET6)
180 int on = (family == AF_INET6);
181 setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &on, sizeof (on));
183 else if (ptr->ai_family == AF_INET && family == AF_UNSPEC)
185 for (const struct addrinfo *p = ptr; p != NULL; p = p->ai_next)
186 if (p->ai_family == AF_INET6)
196 if (family == AF_UNSPEC && ptr->ai_next != NULL)
198 msg_Warn (obj, "ambiguous network protocol specification");
199 msg_Warn (obj, "please select IP version explicitly");
203 fd = net_SetupDgramSocket( obj, fd, ptr );
207 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
208 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
218 vlc_freeaddrinfo (res);
223 static int net_SetMcastHopLimit( vlc_object_t *p_this,
224 int fd, int family, int hlim )
228 /* There is some confusion in the world whether IP_MULTICAST_TTL
229 * takes a byte or an int as an argument.
230 * BSD seems to indicate byte so we are going with that and use
231 * int as a fallback to be safe */
234 #ifdef IP_MULTICAST_TTL
237 cmd = IP_MULTICAST_TTL;
241 #ifdef IPV6_MULTICAST_HOPS
244 cmd = IPV6_MULTICAST_HOPS;
249 errno = EAFNOSUPPORT;
250 msg_Warn( p_this, "%m" );
254 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
256 /* BSD compatibility */
259 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
260 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
268 static int net_SetMcastOutIface (int fd, int family, int scope)
272 #ifdef IPV6_MULTICAST_IF
274 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
275 &scope, sizeof (scope));
281 struct ip_mreqn req = { .imr_ifindex = scope };
283 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
289 errno = EAFNOSUPPORT;
294 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
296 #ifdef IP_MULTICAST_IF
297 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
299 errno = EAFNOSUPPORT;
305 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
306 const char *iface, const char *addr)
310 int scope = if_nametoindex (iface);
313 msg_Err (p_this, "invalid multicast interface: %s", iface);
317 if (net_SetMcastOutIface (fd, family, scope) == 0)
320 msg_Err (p_this, "%s: %m", iface);
325 if (family == AF_INET)
328 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
330 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
335 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
338 msg_Err (p_this, "%s: %m", addr);
347 * Old-style any-source multicast join.
348 * In use on Windows XP/2003 and older.
351 net_IPv4Join (vlc_object_t *obj, int fd,
352 const struct sockaddr_in *src, const struct sockaddr_in *grp)
354 #ifdef IP_ADD_MEMBERSHIP
358 # ifdef IP_ADD_SOURCE_MEMBERSHIP
359 struct ip_mreq_source gsr4;
363 struct in_addr id = { .s_addr = INADDR_ANY };
366 /* Multicast interface IPv4 address */
367 char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
369 && (inet_pton (AF_INET, iface, &id) <= 0))
371 msg_Err (obj, "invalid multicast interface address %s", iface);
377 memset (&opt, 0, sizeof (opt));
380 # ifdef IP_ADD_SOURCE_MEMBERSHIP
381 cmd = IP_ADD_SOURCE_MEMBERSHIP;
382 opt.gsr4.imr_multiaddr = grp->sin_addr;
383 opt.gsr4.imr_sourceaddr = src->sin_addr;
384 opt.gsr4.imr_interface = id;
385 optlen = sizeof (opt.gsr4);
393 cmd = IP_ADD_MEMBERSHIP;
394 opt.gr4.imr_multiaddr = grp->sin_addr;
395 opt.gr4.imr_interface = id;
396 optlen = sizeof (opt.gr4);
399 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
400 (src != NULL) ? "SOURCE_" : "");
402 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
408 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
414 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
416 #ifdef IPV6_JOIN_GROUP
417 struct ipv6_mreq gr6;
418 memset (&gr6, 0, sizeof (gr6));
419 gr6.ipv6mr_interface = src->sin6_scope_id;
420 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
422 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
424 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
430 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
435 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
437 * I hate manual definitions: Error-prone. Portability hell.
438 * Developers shall use UP-TO-DATE compilers. Full point.
439 * If you remove the warning, you remove the whole ifndef.
441 # warning Your C headers are out-of-date. Please update.
443 # define MCAST_JOIN_GROUP 41
447 struct sockaddr_storage gr_group;
450 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
451 struct group_source_req
453 uint32_t gsr_interface;
454 struct sockaddr_storage gsr_group;
455 struct sockaddr_storage gsr_source;
460 * IP-agnostic multicast join,
461 * with fallback to old APIs, and fallback from SSM to ASM.
464 net_SourceSubscribe (vlc_object_t *obj, int fd,
465 const struct sockaddr *src, socklen_t srclen,
466 const struct sockaddr *grp, socklen_t grplen)
470 char *iface = var_CreateGetNonEmptyString (obj, "miface");
473 iid = if_nametoindex (iface);
476 msg_Err (obj, "invalid multicast interface: %s", iface);
483 switch (grp->sa_family)
488 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
489 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
498 errno = EAFNOSUPPORT;
503 switch (src->sa_family)
507 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
508 &in6addr_any, sizeof (in6addr_any)) == 0)
514 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
521 /* Agnostic ASM/SSM multicast join */
522 #ifdef MCAST_JOIN_SOURCE_GROUP
526 struct group_source_req gsr;
530 memset (&opt, 0, sizeof (opt));
534 if ((grplen > sizeof (opt.gsr.gsr_group))
535 || (srclen > sizeof (opt.gsr.gsr_source)))
538 opt.gsr.gsr_interface = iid;
539 memcpy (&opt.gsr.gsr_source, src, srclen);
540 memcpy (&opt.gsr.gsr_group, grp, grplen);
541 optlen = sizeof (opt.gsr);
545 if (grplen > sizeof (opt.gr.gr_group))
548 opt.gr.gr_interface = iid;
549 memcpy (&opt.gr.gr_group, grp, grplen);
550 optlen = sizeof (opt.gr);
553 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
555 if (setsockopt (fd, level,
556 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
557 (void *)&opt, optlen) == 0)
561 /* Fallback to IPv-specific APIs */
562 if ((src != NULL) && (src->sa_family != grp->sa_family))
565 switch (grp->sa_family)
568 if ((grplen < sizeof (struct sockaddr_in))
569 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
572 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
573 (const struct sockaddr_in *)grp) == 0)
579 if ((grplen < sizeof (struct sockaddr_in6))
580 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
583 /* IPv6-specific SSM API does not exist. So if we're here
584 * it means IPv6 SSM is not supported on this OS and we
585 * directly fallback to ASM */
587 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
593 msg_Err (obj, "Multicast group join error (%m)");
597 msg_Warn (obj, "Trying ASM instead of SSM...");
598 return net_Subscribe (obj, fd, grp, grplen);
601 msg_Err (obj, "Multicast not supported");
606 int net_Subscribe (vlc_object_t *obj, int fd,
607 const struct sockaddr *addr, socklen_t addrlen)
609 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
613 static int net_SetDSCP( int fd, uint8_t dscp )
615 struct sockaddr_storage addr;
616 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
621 switch( addr.ss_family )
642 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
645 #undef net_ConnectDgram
646 /*****************************************************************************
648 *****************************************************************************
649 * Open a datagram socket to send data to a defined destination, with an
650 * optional hop limit.
651 *****************************************************************************/
652 int net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
653 int i_hlim, int proto )
655 struct addrinfo hints, *res, *ptr;
656 int i_val, i_handle = -1;
657 bool b_unreach = false;
660 i_hlim = var_CreateGetInteger( p_this, "ttl" );
662 memset( &hints, 0, sizeof( hints ) );
663 hints.ai_socktype = SOCK_DGRAM;
664 hints.ai_protocol = proto;
666 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
668 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
671 msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
672 vlc_gai_strerror( i_val ) );
676 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
679 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
684 #if !defined( SYS_BEOS )
685 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
686 * to avoid packet loss caused by scheduling problems */
687 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
688 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
690 /* Allow broadcast sending */
691 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
695 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
697 str = var_CreateGetNonEmptyString (p_this, "miface");
700 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
704 str = var_CreateGetNonEmptyString (p_this, "miface-addr");
707 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
711 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
713 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
720 #if defined( WIN32 ) || defined( UNDER_CE )
721 if( WSAGetLastError () == WSAENETUNREACH )
723 if( errno == ENETUNREACH )
728 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
734 vlc_freeaddrinfo( res );
739 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
748 /*****************************************************************************
750 *****************************************************************************
751 * OpenDgram a datagram socket and return a handle
752 *****************************************************************************/
753 int net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
754 const char *psz_server, int i_server,
755 int family, int protocol )
757 if ((psz_server == NULL) || (psz_server[0] == '\0'))
758 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
760 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
761 psz_server, i_server, psz_bind, i_bind);
763 struct addrinfo hints, *loc, *rem;
766 memset (&hints, 0, sizeof (hints));
767 hints.ai_family = family;
768 hints.ai_socktype = SOCK_DGRAM;
769 hints.ai_protocol = protocol;
771 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
774 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
775 vlc_gai_strerror (val));
779 hints.ai_flags = AI_PASSIVE;
780 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
783 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
784 vlc_gai_strerror (val));
785 vlc_freeaddrinfo (rem);
789 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
791 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
794 continue; // usually, address family not supported
796 fd = net_SetupDgramSocket( obj, fd, ptr );
801 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
803 if ((ptr2->ai_family != ptr->ai_family)
804 || (ptr2->ai_socktype != ptr->ai_socktype)
805 || (ptr2->ai_protocol != ptr->ai_protocol))
808 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
809 ? net_SourceSubscribe (obj, fd,
810 ptr2->ai_addr, ptr2->ai_addrlen,
811 ptr->ai_addr, ptr->ai_addrlen)
812 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
814 msg_Err (obj, "cannot connect to %s port %d: %m",
815 psz_server, i_server);
828 vlc_freeaddrinfo (rem);
829 vlc_freeaddrinfo (loc);
836 * Sets the send and receive checksum coverage of a socket:
838 * @param sendcov payload coverage of sent packets (bytes), -1 for full
839 * @param recvcov minimum payload coverage of received packets, -1 for full
841 int net_SetCSCov (int fd, int sendcov, int recvcov)
845 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
846 &type, &(socklen_t){ sizeof (type) }))
851 #ifdef UDPLITE_RECV_CSCOV
852 case SOCK_DGRAM: /* UDP-Lite */
856 sendcov += 8; /* partial */
857 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
865 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
866 &recvcov, sizeof (recvcov)))
871 #ifdef DCCP_SOCKOPT_SEND_CSCOV
872 case SOCK_DCCP: /* DCCP and its ill-named socket type */
873 if ((sendcov == -1) || (sendcov > 56))
876 sendcov = (sendcov + 3) / 4;
877 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
878 &sendcov, sizeof (sendcov)))
881 if ((recvcov == -1) || (recvcov > 56))
884 recvcov = (recvcov + 3) / 4;
885 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
886 &recvcov, sizeof (recvcov)))
892 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )