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 #ifdef HAVE_SYS_TIME_H
39 # include <sys/time.h>
42 #include <vlc_network.h>
45 # if defined(UNDER_CE)
46 # undef IP_MULTICAST_TTL
47 # define IP_MULTICAST_TTL 3
48 # undef IP_ADD_MEMBERSHIP
49 # define IP_ADD_MEMBERSHIP 5
51 # define EAFNOSUPPORT WSAEAFNOSUPPORT
52 # define if_nametoindex( str ) atoi( str )
60 #ifdef HAVE_LINUX_DCCP_H
61 # include <linux/dccp.h>
62 # ifndef SOCK_DCCP /* provisional API */
68 # define SOL_IP IPPROTO_IP
71 # define SOL_IPV6 IPPROTO_IPV6
74 # define IPPROTO_IPV6 41 /* IANA */
77 # define SOL_DCCP IPPROTO_DCCP
80 # define IPPROTO_DCCP 33 /* IANA */
83 # define SOL_UDPLITE IPPROTO_UDPLITE
85 #ifndef IPPROTO_UDPLITE
86 # define IPPROTO_UDPLITE 136 /* IANA */
89 #if defined (HAVE_NETINET_UDPLITE_H)
90 # include <netinet/udplite.h>
91 #elif defined (__linux__)
92 /* still missing from glibc 2.6 */
93 # define UDPLITE_SEND_CSCOV 10
94 # define UDPLITE_RECV_CSCOV 11
97 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
101 static int net_SetupDgramSocket( vlc_object_t *p_obj, int fd, const struct addrinfo *ptr )
104 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
108 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
109 * to avoid packet loss caused in case of scheduling hiccups */
110 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
111 (void *)&(int){ 0x80000 }, sizeof (int));
112 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
113 (void *)&(int){ 0x80000 }, sizeof (int));
116 #if defined (WIN32) || defined (UNDER_CE)
117 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
118 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
120 // This works for IPv4 too - don't worry!
121 struct sockaddr_in6 dumb =
123 .sin6_family = ptr->ai_addr->sa_family,
124 .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( p_obj, "socket bind error (%m)" );
141 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
142 int family, int protocol)
144 struct addrinfo hints, *res;
146 memset (&hints, 0, sizeof( hints ));
147 hints.ai_family = family;
148 hints.ai_socktype = SOCK_DGRAM;
149 hints.ai_flags = AI_PASSIVE;
154 msg_Dbg (obj, "net: opening %s datagram port %d",
155 host ? host : "any", port);
157 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
160 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
161 vlc_gai_strerror (val));
167 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
169 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
170 protocol ? protocol : ptr->ai_protocol);
173 msg_Dbg (obj, "socket error: %m");
177 if (ptr->ai_next != NULL)
180 if ((ptr->ai_family != AF_INET6)
181 || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
185 msg_Err (obj, "Multiple network protocols present");
186 msg_Err (obj, "Please select network protocol manually");
190 fd = net_SetupDgramSocket( obj, fd, ptr );
194 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
195 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
205 vlc_freeaddrinfo (res);
210 static int net_SetMcastHopLimit( vlc_object_t *p_this,
211 int fd, int family, int hlim )
215 /* There is some confusion in the world whether IP_MULTICAST_TTL
216 * takes a byte or an int as an argument.
217 * BSD seems to indicate byte so we are going with that and use
218 * int as a fallback to be safe */
221 #ifdef IP_MULTICAST_TTL
224 cmd = IP_MULTICAST_TTL;
228 #ifdef IPV6_MULTICAST_HOPS
231 cmd = IPV6_MULTICAST_HOPS;
236 errno = EAFNOSUPPORT;
237 msg_Warn( p_this, "%m" );
241 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
243 /* BSD compatibility */
246 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
247 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
255 static int net_SetMcastOutIface (int fd, int family, int scope)
259 #ifdef IPV6_MULTICAST_IF
261 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
262 &scope, sizeof (scope));
268 struct ip_mreqn req = { .imr_ifindex = scope };
270 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
276 errno = EAFNOSUPPORT;
281 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
283 #ifdef IP_MULTICAST_IF
284 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
286 errno = EAFNOSUPPORT;
292 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
293 const char *iface, const char *addr)
297 int scope = if_nametoindex (iface);
300 msg_Err (p_this, "invalid multicast interface: %s", iface);
304 if (net_SetMcastOutIface (fd, family, scope) == 0)
307 msg_Err (p_this, "%s: %m", iface);
312 if (family == AF_INET)
315 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
317 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
322 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
325 msg_Err (p_this, "%s: %m", addr);
334 * Old-style any-source multicast join.
335 * In use on Windows XP/2003 and older.
338 net_IPv4Join (vlc_object_t *obj, int fd,
339 const struct sockaddr_in *src, const struct sockaddr_in *grp)
341 #ifdef IP_ADD_MEMBERSHIP
345 # ifdef IP_ADD_SOURCE_MEMBERSHIP
346 struct ip_mreq_source gsr4;
350 struct in_addr id = { .s_addr = INADDR_ANY };
353 /* Multicast interface IPv4 address */
354 char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
356 && (inet_pton (AF_INET, iface, &id) <= 0))
358 msg_Err (obj, "invalid multicast interface address %s", iface);
364 memset (&opt, 0, sizeof (opt));
367 # ifdef IP_ADD_SOURCE_MEMBERSHIP
368 cmd = IP_ADD_SOURCE_MEMBERSHIP;
369 opt.gsr4.imr_multiaddr = grp->sin_addr;
370 opt.gsr4.imr_sourceaddr = src->sin_addr;
371 opt.gsr4.imr_interface = id;
372 optlen = sizeof (opt.gsr4);
380 cmd = IP_ADD_MEMBERSHIP;
381 opt.gr4.imr_multiaddr = grp->sin_addr;
382 opt.gr4.imr_interface = id;
383 optlen = sizeof (opt.gr4);
386 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
387 (src != NULL) ? "SOURCE_" : "");
389 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
395 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
401 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
403 #ifdef IPV6_JOIN_GROUP
404 struct ipv6_mreq gr6;
405 memset (&gr6, 0, sizeof (gr6));
406 gr6.ipv6mr_interface = src->sin6_scope_id;
407 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
409 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
411 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
417 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
422 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
424 * I hate manual definitions: Error-prone. Portability hell.
425 * Developers shall use UP-TO-DATE compilers. Full point.
426 * If you remove the warning, you remove the whole ifndef.
428 # warning Your C headers are out-of-date. Please update.
430 # define MCAST_JOIN_GROUP 41
434 struct sockaddr_storage gr_group;
437 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
438 struct group_source_req
440 uint32_t gsr_interface;
441 struct sockaddr_storage gsr_group;
442 struct sockaddr_storage gsr_source;
447 * IP-agnostic multicast join,
448 * with fallback to old APIs, and fallback from SSM to ASM.
451 net_SourceSubscribe (vlc_object_t *obj, int fd,
452 const struct sockaddr *src, socklen_t srclen,
453 const struct sockaddr *grp, socklen_t grplen)
457 char *iface = var_CreateGetNonEmptyString (obj, "miface");
460 iid = if_nametoindex (iface);
463 msg_Err (obj, "invalid multicast interface: %s", iface);
470 switch (grp->sa_family)
475 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
476 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
485 errno = EAFNOSUPPORT;
490 switch (src->sa_family)
494 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
495 &in6addr_any, sizeof (in6addr_any)) == 0)
501 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
508 /* Agnostic ASM/SSM multicast join */
509 #ifdef MCAST_JOIN_SOURCE_GROUP
513 struct group_source_req gsr;
517 memset (&opt, 0, sizeof (opt));
521 if ((grplen > sizeof (opt.gsr.gsr_group))
522 || (srclen > sizeof (opt.gsr.gsr_source)))
525 opt.gsr.gsr_interface = iid;
526 memcpy (&opt.gsr.gsr_source, src, srclen);
527 memcpy (&opt.gsr.gsr_group, grp, grplen);
528 optlen = sizeof (opt.gsr);
532 if (grplen > sizeof (opt.gr.gr_group))
535 opt.gr.gr_interface = iid;
536 memcpy (&opt.gr.gr_group, grp, grplen);
537 optlen = sizeof (opt.gr);
540 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
542 if (setsockopt (fd, level,
543 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
544 (void *)&opt, optlen) == 0)
548 /* Fallback to IPv-specific APIs */
549 if ((src != NULL) && (src->sa_family != grp->sa_family))
552 switch (grp->sa_family)
555 if ((grplen < sizeof (struct sockaddr_in))
556 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
559 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
560 (const struct sockaddr_in *)grp) == 0)
566 if ((grplen < sizeof (struct sockaddr_in6))
567 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
570 /* IPv6-specific SSM API does not exist. So if we're here
571 * it means IPv6 SSM is not supported on this OS and we
572 * directly fallback to ASM */
574 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
580 msg_Err (obj, "Multicast group join error (%m)");
584 msg_Warn (obj, "Trying ASM instead of SSM...");
585 return net_Subscribe (obj, fd, grp, grplen);
588 msg_Err (obj, "Multicast not supported");
593 int net_Subscribe (vlc_object_t *obj, int fd,
594 const struct sockaddr *addr, socklen_t addrlen)
596 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
600 static int net_SetDSCP( int fd, uint8_t dscp )
602 struct sockaddr_storage addr;
603 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
608 switch( addr.ss_family )
629 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
633 /*****************************************************************************
634 * __net_ConnectDgram:
635 *****************************************************************************
636 * Open a datagram socket to send data to a defined destination, with an
637 * optional hop limit.
638 *****************************************************************************/
639 int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
640 int i_hlim, int proto )
642 struct addrinfo hints, *res, *ptr;
643 int i_val, i_handle = -1;
644 bool b_unreach = false;
647 i_hlim = var_CreateGetInteger( p_this, "ttl" );
649 memset( &hints, 0, sizeof( hints ) );
650 hints.ai_socktype = SOCK_DGRAM;
652 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
654 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
657 msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
658 vlc_gai_strerror( i_val ) );
662 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
665 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
666 proto ? proto : ptr->ai_protocol);
670 #if !defined( SYS_BEOS )
671 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
672 * to avoid packet loss caused by scheduling problems */
673 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
674 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
676 /* Allow broadcast sending */
677 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
681 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
683 str = var_CreateGetNonEmptyString (p_this, "miface");
686 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
690 str = var_CreateGetNonEmptyString (p_this, "miface-addr");
693 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
697 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
699 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
706 #if defined( WIN32 ) || defined( UNDER_CE )
707 if( WSAGetLastError () == WSAENETUNREACH )
709 if( errno == ENETUNREACH )
714 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
720 vlc_freeaddrinfo( res );
725 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
734 /*****************************************************************************
736 *****************************************************************************
737 * OpenDgram a datagram socket and return a handle
738 *****************************************************************************/
739 int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
740 const char *psz_server, int i_server,
741 int family, int protocol )
743 if ((psz_server == NULL) || (psz_server[0] == '\0'))
744 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
746 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
747 psz_server, i_server, psz_bind, i_bind);
749 struct addrinfo hints, *loc, *rem;
752 memset (&hints, 0, sizeof (hints));
753 hints.ai_family = family;
754 hints.ai_socktype = SOCK_DGRAM;
756 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
759 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
760 vlc_gai_strerror (val));
764 hints.ai_flags = AI_PASSIVE;
765 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
768 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
769 vlc_gai_strerror (val));
770 vlc_freeaddrinfo (rem);
774 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
776 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
777 protocol ? protocol : ptr->ai_protocol);
779 continue; // usually, address family not supported
781 fd = net_SetupDgramSocket( obj, fd, ptr );
786 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
788 if ((ptr2->ai_family != ptr->ai_family)
789 || (ptr2->ai_socktype != ptr->ai_socktype)
790 || (ptr2->ai_protocol != ptr->ai_protocol))
793 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
794 ? net_SourceSubscribe (obj, fd,
795 ptr2->ai_addr, ptr2->ai_addrlen,
796 ptr->ai_addr, ptr->ai_addrlen)
797 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
799 msg_Err (obj, "cannot connect to %s port %d: %m",
800 psz_server, i_server);
813 vlc_freeaddrinfo (rem);
814 vlc_freeaddrinfo (loc);
821 * Sets the send and receive checksum coverage of a socket:
823 * @param sendcov payload coverage of sent packets (bytes), -1 for full
824 * @param recvcov minimum payload coverage of received packets, -1 for full
826 int net_SetCSCov (int fd, int sendcov, int recvcov)
830 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
831 &type, &(socklen_t){ sizeof (type) }))
836 #ifdef UDPLITE_RECV_CSCOV
837 case SOCK_DGRAM: /* UDP-Lite */
841 sendcov += 8; /* partial */
842 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
850 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
851 &recvcov, sizeof (recvcov)))
856 #ifdef DCCP_SOCKOPT_SEND_CSCOV
857 case SOCK_DCCP: /* DCCP and its ill-named socket type */
858 if ((sendcov == -1) || (sendcov > 56))
861 sendcov = (sendcov + 3) / 4;
862 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
863 &sendcov, sizeof (sendcov)))
866 if ((recvcov == -1) || (recvcov > 56))
869 recvcov = (recvcov + 3) / 4;
870 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
871 &recvcov, sizeof (recvcov)))
877 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )