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 )
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,
96 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
97 int family, int protocol)
99 struct addrinfo hints, *res;
101 memset (&hints, 0, sizeof( hints ));
102 hints.ai_family = family;
103 hints.ai_socktype = SOCK_DGRAM;
104 hints.ai_flags = AI_PASSIVE;
109 msg_Dbg (obj, "net: opening %s datagram port %d", host ?: "any", port);
111 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
114 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
115 vlc_gai_strerror (val));
121 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
123 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
124 protocol ?: ptr->ai_protocol);
127 msg_Dbg (obj, "socket error: %m");
131 if (ptr->ai_next != NULL)
134 if ((ptr->ai_family != AF_INET6)
135 || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
139 msg_Err (obj, "Multiple network protocols present");
140 msg_Err (obj, "Please select network protocol manually");
144 /* Bind the socket */
145 #if defined (WIN32) || defined (UNDER_CE)
146 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
147 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
149 struct sockaddr_in6 dumb =
151 .sin6_family = ptr->ai_addr->sa_family,
152 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
154 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
158 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
160 msg_Err (obj, "socket bind error (%m)");
165 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
166 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
176 vlc_freeaddrinfo (res);
181 static int net_SetMcastHopLimit( vlc_object_t *p_this,
182 int fd, int family, int hlim )
186 /* There is some confusion in the world whether IP_MULTICAST_TTL
187 * takes a byte or an int as an argument.
188 * BSD seems to indicate byte so we are going with that and use
189 * int as a fallback to be safe */
192 #ifdef IP_MULTICAST_TTL
195 cmd = IP_MULTICAST_TTL;
199 #ifdef IPV6_MULTICAST_HOPS
202 cmd = IPV6_MULTICAST_HOPS;
207 errno = EAFNOSUPPORT;
208 msg_Warn( p_this, "%m" );
212 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
214 /* BSD compatibility */
217 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
218 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
226 static int net_SetMcastOutIface (int fd, int family, int scope)
230 #ifdef IPV6_MULTICAST_IF
232 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
233 &scope, sizeof (scope));
239 struct ip_mreqn req = { .imr_ifindex = scope };
241 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
247 errno = EAFNOSUPPORT;
252 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
254 #ifdef IP_MULTICAST_IF
255 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
257 errno = EAFNOSUPPORT;
263 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
264 const char *iface, const char *addr)
268 int scope = if_nametoindex (iface);
271 msg_Err (p_this, "invalid multicast interface: %s", iface);
275 if (net_SetMcastOutIface (fd, family, scope) == 0)
278 msg_Err (p_this, "%s: %m", iface);
283 if (family == AF_INET)
286 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
288 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
293 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
296 msg_Err (p_this, "%s: %m", addr);
305 * Old-style any-source multicast join.
306 * In use on Windows XP/2003 and older.
309 net_IPv4Join (vlc_object_t *obj, int fd,
310 const struct sockaddr_in *src, const struct sockaddr_in *grp)
312 #ifdef IP_ADD_MEMBERSHIP
316 # ifdef IP_ADD_SOURCE_MEMBERSHIP
317 struct ip_mreq_source gsr4;
321 struct in_addr id = { .s_addr = INADDR_ANY };
324 /* Multicast interface IPv4 address */
325 char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
327 && (inet_pton (AF_INET, iface, &id) <= 0))
329 msg_Err (obj, "invalid multicast interface address %s", iface);
335 memset (&opt, 0, sizeof (opt));
338 # ifdef IP_ADD_SOURCE_MEMBERSHIP
339 cmd = IP_ADD_SOURCE_MEMBERSHIP;
340 opt.gsr4.imr_multiaddr = grp->sin_addr;
341 opt.gsr4.imr_sourceaddr = src->sin_addr;
342 opt.gsr4.imr_interface = id;
343 optlen = sizeof (opt.gsr4);
351 cmd = IP_ADD_MEMBERSHIP;
352 opt.gr4.imr_multiaddr = grp->sin_addr;
353 opt.gr4.imr_interface = id;
354 optlen = sizeof (opt.gr4);
357 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
358 (src != NULL) ? "SOURCE_" : "");
360 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
366 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
372 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
374 #ifdef IPV6_JOIN_GROUP
375 struct ipv6_mreq gr6;
376 memset (&gr6, 0, sizeof (gr6));
377 gr6.ipv6mr_interface = src->sin6_scope_id;
378 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
380 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
382 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
388 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
393 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
395 * I hate manual definitions: Error-prone. Portability hell.
396 * Developers shall use UP-TO-DATE compilers. Full point.
397 * If you remove the warning, you remove the whole ifndef.
399 # warning Your C headers are out-of-date. Please update.
401 # define MCAST_JOIN_GROUP 41
405 struct sockaddr_storage gr_group;
408 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
409 struct group_source_req
411 uint32_t gsr_interface;
412 struct sockaddr_storage gsr_group;
413 struct sockaddr_storage gsr_source;
418 * IP-agnostic multicast join,
419 * with fallback to old APIs, and fallback from SSM to ASM.
422 net_SourceSubscribe (vlc_object_t *obj, int fd,
423 const struct sockaddr *src, socklen_t srclen,
424 const struct sockaddr *grp, socklen_t grplen)
428 char *iface = var_CreateGetNonEmptyString (obj, "miface");
431 iid = if_nametoindex (iface);
434 msg_Err (obj, "invalid multicast interface: %s", iface);
441 switch (grp->sa_family)
446 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
447 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
456 errno = EAFNOSUPPORT;
461 switch (src->sa_family)
465 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
466 &in6addr_any, sizeof (in6addr_any)) == 0)
472 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
479 /* Agnostic ASM/SSM multicast join */
480 #ifdef MCAST_JOIN_SOURCE_GROUP
484 struct group_source_req gsr;
488 memset (&opt, 0, sizeof (opt));
492 if ((grplen > sizeof (opt.gsr.gsr_group))
493 || (srclen > sizeof (opt.gsr.gsr_source)))
496 opt.gsr.gsr_interface = iid;
497 memcpy (&opt.gsr.gsr_source, src, srclen);
498 memcpy (&opt.gsr.gsr_group, grp, grplen);
499 optlen = sizeof (opt.gsr);
503 if (grplen > sizeof (opt.gr.gr_group))
506 opt.gr.gr_interface = iid;
507 memcpy (&opt.gr.gr_group, grp, grplen);
508 optlen = sizeof (opt.gr);
511 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
513 if (setsockopt (fd, level,
514 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
515 (void *)&opt, optlen) == 0)
519 /* Fallback to IPv-specific APIs */
520 if ((src != NULL) && (src->sa_family != grp->sa_family))
523 switch (grp->sa_family)
526 if ((grplen < sizeof (struct sockaddr_in))
527 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
530 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
531 (const struct sockaddr_in *)grp) == 0)
537 if ((grplen < sizeof (struct sockaddr_in6))
538 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
541 /* IPv6-specific SSM API does not exist. So if we're here
542 * it means IPv6 SSM is not supported on this OS and we
543 * directly fallback to ASM */
545 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
551 msg_Err (obj, "Multicast group join error (%m)");
555 msg_Warn (obj, "Trying ASM instead of SSM...");
556 return net_Subscribe (obj, fd, grp, grplen);
559 msg_Err (obj, "Multicast not supported");
564 int net_Subscribe (vlc_object_t *obj, int fd,
565 const struct sockaddr *addr, socklen_t addrlen)
567 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
571 static int net_SetDSCP( int fd, uint8_t dscp )
573 struct sockaddr_storage addr;
574 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
579 switch( addr.ss_family )
600 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
604 /*****************************************************************************
605 * __net_ConnectDgram:
606 *****************************************************************************
607 * Open a datagram socket to send data to a defined destination, with an
608 * optional hop limit.
609 *****************************************************************************/
610 int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
611 int i_hlim, int proto )
613 struct addrinfo hints, *res, *ptr;
614 int i_val, i_handle = -1;
615 vlc_bool_t b_unreach = VLC_FALSE;
618 i_port = 1234; /* historical VLC thing */
621 i_hlim = var_CreateGetInteger( p_this, "ttl" );
623 memset( &hints, 0, sizeof( hints ) );
624 hints.ai_socktype = SOCK_DGRAM;
626 msg_Dbg( p_this, "net: connecting to %s port %d", psz_host, i_port );
628 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
631 msg_Err( p_this, "cannot resolve %s port %d : %s", psz_host, i_port,
632 vlc_gai_strerror( i_val ) );
636 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
639 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
640 proto ?: ptr->ai_protocol);
644 #if !defined( SYS_BEOS )
645 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
646 * to avoid packet loss caused by scheduling problems */
647 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
648 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
650 /* Allow broadcast sending */
651 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
655 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
657 str = var_CreateGetNonEmptyString (p_this, "miface");
660 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
664 str = var_CreateGetNonEmptyString (p_this, "miface-addr");
667 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
671 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
673 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
680 #if defined( WIN32 ) || defined( UNDER_CE )
681 if( WSAGetLastError () == WSAENETUNREACH )
683 if( errno == ENETUNREACH )
685 b_unreach = VLC_TRUE;
688 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
694 vlc_freeaddrinfo( res );
699 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
708 /*****************************************************************************
710 *****************************************************************************
711 * OpenDgram a datagram socket and return a handle
712 *****************************************************************************/
713 int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
714 const char *psz_server, int i_server,
715 int family, int protocol )
717 if ((psz_server == NULL) || (psz_server[0] == '\0'))
718 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
720 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
721 psz_server, i_server, psz_bind, i_bind);
723 struct addrinfo hints, *loc, *rem;
726 memset (&hints, 0, sizeof (hints));
727 hints.ai_family = family;
728 hints.ai_socktype = SOCK_DGRAM;
730 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
733 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
734 vlc_gai_strerror (val));
738 hints.ai_flags = AI_PASSIVE;
739 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
742 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
743 vlc_gai_strerror (val));
744 vlc_freeaddrinfo (rem);
748 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
750 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
751 protocol ?: ptr->ai_protocol);
753 continue; // usually, address family not supported
756 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
760 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
761 * to avoid packet loss caused in case of scheduling hiccups */
762 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
763 (void *)&(int){ 0x80000 }, sizeof (int));
764 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
765 (void *)&(int){ 0x80000 }, sizeof (int));
768 #if defined (WIN32) || defined (UNDER_CE)
769 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
770 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
772 // This works for IPv4 too - don't worry!
773 struct sockaddr_in6 dumb =
775 .sin6_family = ptr->ai_addr->sa_family,
776 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
779 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
783 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
790 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
792 if ((ptr2->ai_family != ptr->ai_family)
793 || (ptr2->ai_socktype != ptr->ai_socktype)
794 || (ptr2->ai_protocol != ptr->ai_protocol))
797 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
798 ? net_SourceSubscribe (obj, fd,
799 ptr2->ai_addr, ptr2->ai_addrlen,
800 ptr->ai_addr, ptr->ai_addrlen)
801 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
803 msg_Err (obj, "cannot connect to %s port %d: %m",
804 psz_server, i_server);
817 vlc_freeaddrinfo (rem);
818 vlc_freeaddrinfo (loc);
825 * Sets the send and receive checksum coverage of a socket:
827 * @param sendcov payload coverage of sent packets (bytes), -1 for full
828 * @param recvcov minimum payload coverage of received packets, -1 for full
830 int net_SetCSCov (int fd, int sendcov, int recvcov)
834 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
835 &type, &(socklen_t){ sizeof (type) }))
840 #ifdef UDPLITE_RECV_CSCOV
841 case SOCK_DGRAM: /* UDP-Lite */
845 sendcov += 8; /* partial */
846 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
854 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
855 &recvcov, sizeof (recvcov)))
860 #ifdef DCCP_SOCKOPT_SEND_CSCOV
861 case SOCK_DCCP: /* DCCP and its ill-named socket type */
862 if ((sendcov == -1) || (sendcov > 56))
865 sendcov = (sendcov + 3) / 4;
866 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
867 &sendcov, sizeof (sendcov)))
870 if ((recvcov == -1) || (recvcov > 56))
873 recvcov = (recvcov + 3) / 4;
874 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
875 &recvcov, sizeof (recvcov)))