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_flags = AI_PASSIVE;
150 msg_Dbg (obj, "net: opening %s datagram port %d",
151 host ? host : "any", port);
153 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
156 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
157 vlc_gai_strerror (val));
163 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
165 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
166 protocol ? protocol : ptr->ai_protocol);
169 msg_Dbg (obj, "socket error: %m");
174 /* If IPv6 was forced, set IPv6-only mode.
175 * If IPv4 was forced, do nothing extraordinary.
176 * If nothing was forced, try dual-mode IPv6. */
177 if (ptr->ai_family == AF_INET6)
179 int on = (family == AF_INET6);
180 setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &on, sizeof (on));
182 else if (ptr->ai_family == AF_INET && family == AF_UNSPEC)
184 for (const struct addrinfo *p = ptr; p != NULL; p = p->ai_next)
185 if (p->ai_family == AF_INET6)
195 if (family == AF_UNSPEC && ptr->ai_next != NULL)
197 msg_Warn (obj, "ambiguous network protocol specification");
198 msg_Warn (obj, "please select IP version explicitly");
202 fd = net_SetupDgramSocket( obj, fd, ptr );
206 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
207 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
217 vlc_freeaddrinfo (res);
222 static int net_SetMcastHopLimit( vlc_object_t *p_this,
223 int fd, int family, int hlim )
227 /* There is some confusion in the world whether IP_MULTICAST_TTL
228 * takes a byte or an int as an argument.
229 * BSD seems to indicate byte so we are going with that and use
230 * int as a fallback to be safe */
233 #ifdef IP_MULTICAST_TTL
236 cmd = IP_MULTICAST_TTL;
240 #ifdef IPV6_MULTICAST_HOPS
243 cmd = IPV6_MULTICAST_HOPS;
248 errno = EAFNOSUPPORT;
249 msg_Warn( p_this, "%m" );
253 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
255 /* BSD compatibility */
258 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
259 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
267 static int net_SetMcastOutIface (int fd, int family, int scope)
271 #ifdef IPV6_MULTICAST_IF
273 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
274 &scope, sizeof (scope));
280 struct ip_mreqn req = { .imr_ifindex = scope };
282 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
288 errno = EAFNOSUPPORT;
293 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
295 #ifdef IP_MULTICAST_IF
296 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
298 errno = EAFNOSUPPORT;
304 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
305 const char *iface, const char *addr)
309 int scope = if_nametoindex (iface);
312 msg_Err (p_this, "invalid multicast interface: %s", iface);
316 if (net_SetMcastOutIface (fd, family, scope) == 0)
319 msg_Err (p_this, "%s: %m", iface);
324 if (family == AF_INET)
327 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
329 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
334 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
337 msg_Err (p_this, "%s: %m", addr);
346 * Old-style any-source multicast join.
347 * In use on Windows XP/2003 and older.
350 net_IPv4Join (vlc_object_t *obj, int fd,
351 const struct sockaddr_in *src, const struct sockaddr_in *grp)
353 #ifdef IP_ADD_MEMBERSHIP
357 # ifdef IP_ADD_SOURCE_MEMBERSHIP
358 struct ip_mreq_source gsr4;
362 struct in_addr id = { .s_addr = INADDR_ANY };
365 /* Multicast interface IPv4 address */
366 char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
368 && (inet_pton (AF_INET, iface, &id) <= 0))
370 msg_Err (obj, "invalid multicast interface address %s", iface);
376 memset (&opt, 0, sizeof (opt));
379 # ifdef IP_ADD_SOURCE_MEMBERSHIP
380 cmd = IP_ADD_SOURCE_MEMBERSHIP;
381 opt.gsr4.imr_multiaddr = grp->sin_addr;
382 opt.gsr4.imr_sourceaddr = src->sin_addr;
383 opt.gsr4.imr_interface = id;
384 optlen = sizeof (opt.gsr4);
392 cmd = IP_ADD_MEMBERSHIP;
393 opt.gr4.imr_multiaddr = grp->sin_addr;
394 opt.gr4.imr_interface = id;
395 optlen = sizeof (opt.gr4);
398 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
399 (src != NULL) ? "SOURCE_" : "");
401 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
407 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
413 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
415 #ifdef IPV6_JOIN_GROUP
416 struct ipv6_mreq gr6;
417 memset (&gr6, 0, sizeof (gr6));
418 gr6.ipv6mr_interface = src->sin6_scope_id;
419 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
421 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
423 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
429 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
434 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
436 * I hate manual definitions: Error-prone. Portability hell.
437 * Developers shall use UP-TO-DATE compilers. Full point.
438 * If you remove the warning, you remove the whole ifndef.
440 # warning Your C headers are out-of-date. Please update.
442 # define MCAST_JOIN_GROUP 41
446 struct sockaddr_storage gr_group;
449 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
450 struct group_source_req
452 uint32_t gsr_interface;
453 struct sockaddr_storage gsr_group;
454 struct sockaddr_storage gsr_source;
459 * IP-agnostic multicast join,
460 * with fallback to old APIs, and fallback from SSM to ASM.
463 net_SourceSubscribe (vlc_object_t *obj, int fd,
464 const struct sockaddr *src, socklen_t srclen,
465 const struct sockaddr *grp, socklen_t grplen)
469 char *iface = var_CreateGetNonEmptyString (obj, "miface");
472 iid = if_nametoindex (iface);
475 msg_Err (obj, "invalid multicast interface: %s", iface);
482 switch (grp->sa_family)
487 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
488 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
497 errno = EAFNOSUPPORT;
502 switch (src->sa_family)
506 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
507 &in6addr_any, sizeof (in6addr_any)) == 0)
513 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
520 /* Agnostic ASM/SSM multicast join */
521 #ifdef MCAST_JOIN_SOURCE_GROUP
525 struct group_source_req gsr;
529 memset (&opt, 0, sizeof (opt));
533 if ((grplen > sizeof (opt.gsr.gsr_group))
534 || (srclen > sizeof (opt.gsr.gsr_source)))
537 opt.gsr.gsr_interface = iid;
538 memcpy (&opt.gsr.gsr_source, src, srclen);
539 memcpy (&opt.gsr.gsr_group, grp, grplen);
540 optlen = sizeof (opt.gsr);
544 if (grplen > sizeof (opt.gr.gr_group))
547 opt.gr.gr_interface = iid;
548 memcpy (&opt.gr.gr_group, grp, grplen);
549 optlen = sizeof (opt.gr);
552 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
554 if (setsockopt (fd, level,
555 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
556 (void *)&opt, optlen) == 0)
560 /* Fallback to IPv-specific APIs */
561 if ((src != NULL) && (src->sa_family != grp->sa_family))
564 switch (grp->sa_family)
567 if ((grplen < sizeof (struct sockaddr_in))
568 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
571 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
572 (const struct sockaddr_in *)grp) == 0)
578 if ((grplen < sizeof (struct sockaddr_in6))
579 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
582 /* IPv6-specific SSM API does not exist. So if we're here
583 * it means IPv6 SSM is not supported on this OS and we
584 * directly fallback to ASM */
586 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
592 msg_Err (obj, "Multicast group join error (%m)");
596 msg_Warn (obj, "Trying ASM instead of SSM...");
597 return net_Subscribe (obj, fd, grp, grplen);
600 msg_Err (obj, "Multicast not supported");
605 int net_Subscribe (vlc_object_t *obj, int fd,
606 const struct sockaddr *addr, socklen_t addrlen)
608 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
612 static int net_SetDSCP( int fd, uint8_t dscp )
614 struct sockaddr_storage addr;
615 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
620 switch( addr.ss_family )
641 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
645 /*****************************************************************************
646 * __net_ConnectDgram:
647 *****************************************************************************
648 * Open a datagram socket to send data to a defined destination, with an
649 * optional hop limit.
650 *****************************************************************************/
651 int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
652 int i_hlim, int proto )
654 struct addrinfo hints, *res, *ptr;
655 int i_val, i_handle = -1;
656 bool b_unreach = false;
659 i_hlim = var_CreateGetInteger( p_this, "ttl" );
661 memset( &hints, 0, sizeof( hints ) );
662 hints.ai_socktype = SOCK_DGRAM;
664 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
666 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
669 msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
670 vlc_gai_strerror( i_val ) );
674 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
677 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
678 proto ? proto : ptr->ai_protocol);
682 #if !defined( SYS_BEOS )
683 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
684 * to avoid packet loss caused by scheduling problems */
685 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
686 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
688 /* Allow broadcast sending */
689 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
693 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
695 str = var_CreateGetNonEmptyString (p_this, "miface");
698 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
702 str = var_CreateGetNonEmptyString (p_this, "miface-addr");
705 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
709 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
711 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
718 #if defined( WIN32 ) || defined( UNDER_CE )
719 if( WSAGetLastError () == WSAENETUNREACH )
721 if( errno == ENETUNREACH )
726 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
732 vlc_freeaddrinfo( res );
737 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
746 /*****************************************************************************
748 *****************************************************************************
749 * OpenDgram a datagram socket and return a handle
750 *****************************************************************************/
751 int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
752 const char *psz_server, int i_server,
753 int family, int protocol )
755 if ((psz_server == NULL) || (psz_server[0] == '\0'))
756 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
758 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
759 psz_server, i_server, psz_bind, i_bind);
761 struct addrinfo hints, *loc, *rem;
764 memset (&hints, 0, sizeof (hints));
765 hints.ai_family = family;
766 hints.ai_socktype = SOCK_DGRAM;
768 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
771 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
772 vlc_gai_strerror (val));
776 hints.ai_flags = AI_PASSIVE;
777 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
780 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
781 vlc_gai_strerror (val));
782 vlc_freeaddrinfo (rem);
786 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
788 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
789 protocol ? protocol : ptr->ai_protocol);
791 continue; // usually, address family not supported
793 fd = net_SetupDgramSocket( obj, fd, ptr );
798 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
800 if ((ptr2->ai_family != ptr->ai_family)
801 || (ptr2->ai_socktype != ptr->ai_socktype)
802 || (ptr2->ai_protocol != ptr->ai_protocol))
805 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
806 ? net_SourceSubscribe (obj, fd,
807 ptr2->ai_addr, ptr2->ai_addrlen,
808 ptr->ai_addr, ptr->ai_addrlen)
809 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
811 msg_Err (obj, "cannot connect to %s port %d: %m",
812 psz_server, i_server);
825 vlc_freeaddrinfo (rem);
826 vlc_freeaddrinfo (loc);
833 * Sets the send and receive checksum coverage of a socket:
835 * @param sendcov payload coverage of sent packets (bytes), -1 for full
836 * @param recvcov minimum payload coverage of received packets, -1 for full
838 int net_SetCSCov (int fd, int sendcov, int recvcov)
842 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
843 &type, &(socklen_t){ sizeof (type) }))
848 #ifdef UDPLITE_RECV_CSCOV
849 case SOCK_DGRAM: /* UDP-Lite */
853 sendcov += 8; /* partial */
854 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
862 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
863 &recvcov, sizeof (recvcov)))
868 #ifdef DCCP_SOCKOPT_SEND_CSCOV
869 case SOCK_DCCP: /* DCCP and its ill-named socket type */
870 if ((sendcov == -1) || (sendcov > 56))
873 sendcov = (sendcov + 3) / 4;
874 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
875 &sendcov, sizeof (sendcov)))
878 if ((recvcov == -1) || (recvcov > 56))
881 recvcov = (recvcov + 3) / 4;
882 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
883 &recvcov, sizeof (recvcov)))
889 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )