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 #ifdef HAVE_SYS_TIME_H
35 # include <sys/time.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 )
57 # define SOL_IP IPPROTO_IP
60 # define SOL_IPV6 IPPROTO_IPV6
63 # define IPPROTO_IPV6 41
66 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
69 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
70 int family, int protocol)
72 struct addrinfo hints, *res;
74 memset (&hints, 0, sizeof( hints ));
75 hints.ai_family = family;
76 hints.ai_socktype = SOCK_DGRAM;
77 hints.ai_flags = AI_PASSIVE;
82 msg_Dbg (obj, "net: opening %s datagram port %d", host ?: "any", port);
84 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
87 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
88 vlc_gai_strerror (val));
94 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
96 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
97 protocol ?: ptr->ai_protocol);
100 msg_Dbg (obj, "socket error: %s", net_strerror (net_errno));
104 if (ptr->ai_next != NULL)
107 if ((ptr->ai_family != AF_INET6)
108 || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
112 msg_Err (obj, "Multiple network protocols present");
113 msg_Err (obj, "Please select network protocol manually");
117 /* Bind the socket */
118 #if defined (WIN32) || defined (UNDER_CE)
119 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
120 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
122 struct sockaddr_in6 dumb =
124 .sin6_family = ptr->ai_addr->sa_family,
125 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
127 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
131 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
133 msg_Err (obj, "socket bind error (%s)", net_strerror (net_errno));
138 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
139 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
149 vlc_freeaddrinfo (res);
154 static int net_SetMcastHopLimit( vlc_object_t *p_this,
155 int fd, int family, int hlim )
159 /* There is some confusion in the world whether IP_MULTICAST_TTL
160 * takes a byte or an int as an argument.
161 * BSD seems to indicate byte so we are going with that and use
162 * int as a fallback to be safe */
165 #ifdef IP_MULTICAST_TTL
168 cmd = IP_MULTICAST_TTL;
172 #ifdef IPV6_MULTICAST_HOPS
175 cmd = IPV6_MULTICAST_HOPS;
180 msg_Warn( p_this, "%s", strerror( EAFNOSUPPORT ) );
184 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
186 /* BSD compatibility */
189 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
190 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
198 static int net_SetMcastOutIface (int fd, int family, int scope)
202 #ifdef IPV6_MULTICAST_IF
204 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
205 &scope, sizeof (scope));
211 struct ip_mreqn req = { .imr_ifindex = scope };
213 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
219 errno = EAFNOSUPPORT;
224 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
226 #ifdef IP_MULTICAST_IF
227 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
229 errno = EAFNOSUPPORT;
235 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
236 const char *iface, const char *addr)
240 int scope = if_nametoindex (iface);
243 msg_Err (p_this, "invalid multicast interface: %s", iface);
247 if (net_SetMcastOutIface (fd, family, scope) == 0)
250 msg_Err (p_this, "%s: %s", iface, net_strerror (net_errno));
255 if (family == AF_INET)
258 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
260 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
265 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
268 msg_Err (p_this, "%s: %s", addr, net_strerror (net_errno));
277 * Old-style any-source multicast join.
278 * In use on Windows XP/2003 and older.
281 net_IPv4Join (vlc_object_t *obj, int fd,
282 const struct sockaddr_in *src, const struct sockaddr_in *grp)
284 #ifdef IP_ADD_MEMBERSHIP
288 # ifdef IP_ADD_SOURCE_MEMBERSHIP
289 struct ip_mreq_source gsr4;
293 struct in_addr id = { .s_addr = INADDR_ANY };
296 /* Multicast interface IPv4 address */
297 char *iface = var_CreateGetString (obj, "miface-addr");
301 && (inet_pton (AF_INET, iface, &id) <= 0))
303 msg_Err (obj, "invalid multicast interface address %s", iface);
309 memset (&opt, 0, sizeof (opt));
312 # ifdef IP_ADD_SOURCE_MEMBERSHIP
313 cmd = IP_ADD_SOURCE_MEMBERSHIP;
314 opt.gsr4.imr_multiaddr = grp->sin_addr;
315 opt.gsr4.imr_sourceaddr = src->sin_addr;
316 opt.gsr4.imr_interface = id;
317 optlen = sizeof (opt.gsr4);
325 cmd = IP_ADD_MEMBERSHIP;
326 opt.gr4.imr_multiaddr = grp->sin_addr;
327 opt.gr4.imr_interface = id;
328 optlen = sizeof (opt.gr4);
331 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
332 (src != NULL) ? "SOURCE_" : "");
334 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
340 msg_Err (obj, "cannot join IPv4 multicast group (%s)",
341 net_strerror (net_errno));
347 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
349 #ifdef IPV6_JOIN_GROUP
350 struct ipv6_mreq gr6;
351 memset (&gr6, 0, sizeof (gr6));
352 gr6.ipv6mr_interface = src->sin6_scope_id;
353 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
355 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
357 if (!setsockopt (fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
363 msg_Err (obj, "cannot join IPv6 any-source multicast group (%s)",
364 net_strerror (net_errno));
369 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
371 * I hate manual definitions: Error-prone. Portability hell.
372 * Developers shall use UP-TO-DATE compilers. Full point.
373 * If you remove the warning, you remove the whole ifndef.
375 # warning Your C headers are out-of-date. Please update.
377 # define MCAST_JOIN_GROUP 41
381 struct sockaddr_storage gr_group;
384 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
385 struct group_source_req
387 uint32_t gsr_interface;
388 struct sockaddr_storage gsr_group;
389 struct sockaddr_storage gsr_source;
394 * IP-agnostic multicast join,
395 * with fallback to old APIs, and fallback from SSM to ASM.
398 net_SourceSubscribe (vlc_object_t *obj, int fd,
399 const struct sockaddr *src, socklen_t srclen,
400 const struct sockaddr *grp, socklen_t grplen)
404 char *iface = var_CreateGetString (obj, "miface");
409 iid = if_nametoindex (iface);
412 msg_Err (obj, "invalid multicast interface: %s", iface);
420 switch (grp->sa_family)
425 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
426 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
435 errno = EAFNOSUPPORT;
440 switch (src->sa_family)
444 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
445 &in6addr_any, sizeof (in6addr_any)) == 0)
451 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
458 /* Agnostic ASM/SSM multicast join */
459 #ifdef MCAST_JOIN_SOURCE_GROUP
463 struct group_source_req gsr;
467 memset (&opt, 0, sizeof (opt));
471 if ((grplen > sizeof (opt.gsr.gsr_group))
472 || (srclen > sizeof (opt.gsr.gsr_source)))
475 opt.gsr.gsr_interface = iid;
476 memcpy (&opt.gsr.gsr_source, src, srclen);
477 memcpy (&opt.gsr.gsr_group, grp, grplen);
478 optlen = sizeof (opt.gsr);
482 if (grplen > sizeof (opt.gr.gr_group))
485 opt.gr.gr_interface = iid;
486 memcpy (&opt.gr.gr_group, grp, grplen);
487 optlen = sizeof (opt.gr);
490 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
492 if (setsockopt (fd, level,
493 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
494 (void *)&opt, optlen) == 0)
498 /* Fallback to IPv-specific APIs */
499 if ((src != NULL) && (src->sa_family != grp->sa_family))
502 switch (grp->sa_family)
505 if ((grplen < sizeof (struct sockaddr_in))
506 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
509 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
510 (const struct sockaddr_in *)grp) == 0)
516 if ((grplen < sizeof (struct sockaddr_in6))
517 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
520 /* IPv6-specific SSM API does not exist. So if we're here
521 * it means IPv6 SSM is not supported on this OS and we
522 * directly fallback to ASM */
524 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
530 msg_Err (obj, "Multicast group join error (%s)",
531 net_strerror (net_errno));
535 msg_Warn (obj, "Trying ASM instead of SSM...");
536 return net_Subscribe (obj, fd, grp, grplen);
539 msg_Err (obj, "Multicast not supported");
544 int net_Subscribe (vlc_object_t *obj, int fd,
545 const struct sockaddr *addr, socklen_t addrlen)
547 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
551 static int net_SetDSCP( int fd, uint8_t dscp )
553 struct sockaddr_storage addr;
554 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
559 switch( addr.ss_family )
580 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
584 /*****************************************************************************
585 * __net_ConnectDgram:
586 *****************************************************************************
587 * Open a datagram socket to send data to a defined destination, with an
588 * optional hop limit.
589 *****************************************************************************/
590 int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
591 int i_hlim, int proto )
593 struct addrinfo hints, *res, *ptr;
594 int i_val, i_handle = -1;
595 vlc_bool_t b_unreach = VLC_FALSE;
598 i_port = 1234; /* historical VLC thing */
601 i_hlim = var_CreateGetInteger( p_this, "ttl" );
603 memset( &hints, 0, sizeof( hints ) );
604 hints.ai_socktype = SOCK_DGRAM;
606 msg_Dbg( p_this, "net: connecting to %s port %d", psz_host, i_port );
608 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
611 msg_Err( p_this, "cannot resolve %s port %d : %s", psz_host, i_port,
612 vlc_gai_strerror( i_val ) );
616 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
619 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
620 proto ?: ptr->ai_protocol);
624 #if !defined( SYS_BEOS )
625 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
626 * to avoid packet loss caused by scheduling problems */
627 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
628 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
630 /* Allow broadcast sending */
631 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
635 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
637 str = var_CreateGetString (p_this, "miface");
641 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
645 str = var_CreateGetString (p_this, "miface-addr");
649 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
653 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
655 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
662 #if defined( WIN32 ) || defined( UNDER_CE )
663 if( WSAGetLastError () == WSAENETUNREACH )
665 if( errno == ENETUNREACH )
667 b_unreach = VLC_TRUE;
670 msg_Warn( p_this, "%s port %d : %s", psz_host, i_port,
677 vlc_freeaddrinfo( res );
682 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
691 /*****************************************************************************
693 *****************************************************************************
694 * OpenDgram a datagram socket and return a handle
695 *****************************************************************************/
696 int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
697 const char *psz_server, int i_server,
698 int family, int protocol )
700 if ((psz_server == NULL) || (psz_server[0] == '\0'))
701 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
703 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
704 psz_server, i_server, psz_bind, i_bind);
706 struct addrinfo hints, *loc, *rem;
709 memset (&hints, 0, sizeof (hints));
710 hints.ai_family = family;
711 hints.ai_socktype = SOCK_DGRAM;
713 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
716 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
717 vlc_gai_strerror (val));
721 hints.ai_flags = AI_PASSIVE;
722 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
725 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
726 vlc_gai_strerror (val));
727 vlc_freeaddrinfo (rem);
731 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
733 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
734 protocol ?: ptr->ai_protocol);
736 continue; // usually, address family not supported
739 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
743 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
744 * to avoid packet loss caused in case of scheduling hiccups */
745 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
746 (void *)&(int){ 0x80000 }, sizeof (int));
747 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
748 (void *)&(int){ 0x80000 }, sizeof (int));
751 #if defined (WIN32) || defined (UNDER_CE)
752 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
753 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
755 // This works for IPv4 too - don't worry!
756 struct sockaddr_in6 dumb =
758 .sin6_family = ptr->ai_addr->sa_family,
759 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
762 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
766 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
773 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
775 if ((ptr2->ai_family != ptr->ai_family)
776 || (ptr2->ai_socktype != ptr->ai_socktype)
777 || (ptr2->ai_protocol != ptr->ai_protocol))
780 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
781 ? net_SourceSubscribe (obj, fd,
782 ptr2->ai_addr, ptr2->ai_addrlen,
783 ptr->ai_addr, ptr->ai_addrlen)
784 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
786 msg_Err (obj, "cannot connect to %s port %d: %s",
787 psz_server, i_server, net_strerror (net_errno));
800 vlc_freeaddrinfo (rem);
801 vlc_freeaddrinfo (loc);