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 *****************************************************************************/
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,
100 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
101 int family, int protocol)
103 struct addrinfo hints, *res;
105 memset (&hints, 0, sizeof( hints ));
106 hints.ai_family = family;
107 hints.ai_socktype = SOCK_DGRAM;
108 hints.ai_flags = AI_PASSIVE;
113 msg_Dbg (obj, "net: opening %s datagram port %d", host ?: "any", port);
115 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
118 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
119 vlc_gai_strerror (val));
125 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
127 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
128 protocol ?: ptr->ai_protocol);
131 msg_Dbg (obj, "socket error: %m");
135 if (ptr->ai_next != NULL)
138 if ((ptr->ai_family != AF_INET6)
139 || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
143 msg_Err (obj, "Multiple network protocols present");
144 msg_Err (obj, "Please select network protocol manually");
148 /* Bind the socket */
149 #if defined (WIN32) || defined (UNDER_CE)
150 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
151 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
153 struct sockaddr_in6 dumb =
155 .sin6_family = ptr->ai_addr->sa_family,
156 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
158 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
162 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
164 msg_Err (obj, "socket bind error (%m)");
169 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
170 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
180 vlc_freeaddrinfo (res);
185 static int net_SetMcastHopLimit( vlc_object_t *p_this,
186 int fd, int family, int hlim )
190 /* There is some confusion in the world whether IP_MULTICAST_TTL
191 * takes a byte or an int as an argument.
192 * BSD seems to indicate byte so we are going with that and use
193 * int as a fallback to be safe */
196 #ifdef IP_MULTICAST_TTL
199 cmd = IP_MULTICAST_TTL;
203 #ifdef IPV6_MULTICAST_HOPS
206 cmd = IPV6_MULTICAST_HOPS;
211 errno = EAFNOSUPPORT;
212 msg_Warn( p_this, "%m" );
216 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
218 /* BSD compatibility */
221 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
222 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
230 static int net_SetMcastOutIface (int fd, int family, int scope)
234 #ifdef IPV6_MULTICAST_IF
236 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
237 &scope, sizeof (scope));
243 struct ip_mreqn req = { .imr_ifindex = scope };
245 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
251 errno = EAFNOSUPPORT;
256 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
258 #ifdef IP_MULTICAST_IF
259 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
261 errno = EAFNOSUPPORT;
267 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
268 const char *iface, const char *addr)
272 int scope = if_nametoindex (iface);
275 msg_Err (p_this, "invalid multicast interface: %s", iface);
279 if (net_SetMcastOutIface (fd, family, scope) == 0)
282 msg_Err (p_this, "%s: %m", iface);
287 if (family == AF_INET)
290 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
292 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
297 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
300 msg_Err (p_this, "%s: %m", addr);
309 * Old-style any-source multicast join.
310 * In use on Windows XP/2003 and older.
313 net_IPv4Join (vlc_object_t *obj, int fd,
314 const struct sockaddr_in *src, const struct sockaddr_in *grp)
316 #ifdef IP_ADD_MEMBERSHIP
320 # ifdef IP_ADD_SOURCE_MEMBERSHIP
321 struct ip_mreq_source gsr4;
325 struct in_addr id = { .s_addr = INADDR_ANY };
328 /* Multicast interface IPv4 address */
329 char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
331 && (inet_pton (AF_INET, iface, &id) <= 0))
333 msg_Err (obj, "invalid multicast interface address %s", iface);
339 memset (&opt, 0, sizeof (opt));
342 # ifdef IP_ADD_SOURCE_MEMBERSHIP
343 cmd = IP_ADD_SOURCE_MEMBERSHIP;
344 opt.gsr4.imr_multiaddr = grp->sin_addr;
345 opt.gsr4.imr_sourceaddr = src->sin_addr;
346 opt.gsr4.imr_interface = id;
347 optlen = sizeof (opt.gsr4);
355 cmd = IP_ADD_MEMBERSHIP;
356 opt.gr4.imr_multiaddr = grp->sin_addr;
357 opt.gr4.imr_interface = id;
358 optlen = sizeof (opt.gr4);
361 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
362 (src != NULL) ? "SOURCE_" : "");
364 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
370 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
376 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
378 #ifdef IPV6_JOIN_GROUP
379 struct ipv6_mreq gr6;
380 memset (&gr6, 0, sizeof (gr6));
381 gr6.ipv6mr_interface = src->sin6_scope_id;
382 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
384 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
386 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
392 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
397 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
399 * I hate manual definitions: Error-prone. Portability hell.
400 * Developers shall use UP-TO-DATE compilers. Full point.
401 * If you remove the warning, you remove the whole ifndef.
403 # warning Your C headers are out-of-date. Please update.
405 # define MCAST_JOIN_GROUP 41
409 struct sockaddr_storage gr_group;
412 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
413 struct group_source_req
415 uint32_t gsr_interface;
416 struct sockaddr_storage gsr_group;
417 struct sockaddr_storage gsr_source;
422 * IP-agnostic multicast join,
423 * with fallback to old APIs, and fallback from SSM to ASM.
426 net_SourceSubscribe (vlc_object_t *obj, int fd,
427 const struct sockaddr *src, socklen_t srclen,
428 const struct sockaddr *grp, socklen_t grplen)
432 char *iface = var_CreateGetNonEmptyString (obj, "miface");
435 iid = if_nametoindex (iface);
438 msg_Err (obj, "invalid multicast interface: %s", iface);
445 switch (grp->sa_family)
450 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
451 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
460 errno = EAFNOSUPPORT;
465 switch (src->sa_family)
469 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
470 &in6addr_any, sizeof (in6addr_any)) == 0)
476 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
483 /* Agnostic ASM/SSM multicast join */
484 #ifdef MCAST_JOIN_SOURCE_GROUP
488 struct group_source_req gsr;
492 memset (&opt, 0, sizeof (opt));
496 if ((grplen > sizeof (opt.gsr.gsr_group))
497 || (srclen > sizeof (opt.gsr.gsr_source)))
500 opt.gsr.gsr_interface = iid;
501 memcpy (&opt.gsr.gsr_source, src, srclen);
502 memcpy (&opt.gsr.gsr_group, grp, grplen);
503 optlen = sizeof (opt.gsr);
507 if (grplen > sizeof (opt.gr.gr_group))
510 opt.gr.gr_interface = iid;
511 memcpy (&opt.gr.gr_group, grp, grplen);
512 optlen = sizeof (opt.gr);
515 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
517 if (setsockopt (fd, level,
518 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
519 (void *)&opt, optlen) == 0)
523 /* Fallback to IPv-specific APIs */
524 if ((src != NULL) && (src->sa_family != grp->sa_family))
527 switch (grp->sa_family)
530 if ((grplen < sizeof (struct sockaddr_in))
531 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
534 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
535 (const struct sockaddr_in *)grp) == 0)
541 if ((grplen < sizeof (struct sockaddr_in6))
542 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
545 /* IPv6-specific SSM API does not exist. So if we're here
546 * it means IPv6 SSM is not supported on this OS and we
547 * directly fallback to ASM */
549 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
555 msg_Err (obj, "Multicast group join error (%m)");
559 msg_Warn (obj, "Trying ASM instead of SSM...");
560 return net_Subscribe (obj, fd, grp, grplen);
563 msg_Err (obj, "Multicast not supported");
568 int net_Subscribe (vlc_object_t *obj, int fd,
569 const struct sockaddr *addr, socklen_t addrlen)
571 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
575 static int net_SetDSCP( int fd, uint8_t dscp )
577 struct sockaddr_storage addr;
578 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
583 switch( addr.ss_family )
604 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
608 /*****************************************************************************
609 * __net_ConnectDgram:
610 *****************************************************************************
611 * Open a datagram socket to send data to a defined destination, with an
612 * optional hop limit.
613 *****************************************************************************/
614 int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
615 int i_hlim, int proto )
617 struct addrinfo hints, *res, *ptr;
618 int i_val, i_handle = -1;
619 vlc_bool_t b_unreach = VLC_FALSE;
622 i_port = 1234; /* historical VLC thing */
625 i_hlim = var_CreateGetInteger( p_this, "ttl" );
627 memset( &hints, 0, sizeof( hints ) );
628 hints.ai_socktype = SOCK_DGRAM;
630 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
632 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
635 msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
636 vlc_gai_strerror( i_val ) );
640 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
643 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
644 proto ?: ptr->ai_protocol);
648 #if !defined( SYS_BEOS )
649 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
650 * to avoid packet loss caused by scheduling problems */
651 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
652 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
654 /* Allow broadcast sending */
655 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
659 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
661 str = var_CreateGetNonEmptyString (p_this, "miface");
664 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
668 str = var_CreateGetNonEmptyString (p_this, "miface-addr");
671 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
675 net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
677 if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
684 #if defined( WIN32 ) || defined( UNDER_CE )
685 if( WSAGetLastError () == WSAENETUNREACH )
687 if( errno == ENETUNREACH )
689 b_unreach = VLC_TRUE;
692 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
698 vlc_freeaddrinfo( res );
703 msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
712 /*****************************************************************************
714 *****************************************************************************
715 * OpenDgram a datagram socket and return a handle
716 *****************************************************************************/
717 int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
718 const char *psz_server, int i_server,
719 int family, int protocol )
721 if ((psz_server == NULL) || (psz_server[0] == '\0'))
722 return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
724 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
725 psz_server, i_server, psz_bind, i_bind);
727 struct addrinfo hints, *loc, *rem;
730 memset (&hints, 0, sizeof (hints));
731 hints.ai_family = family;
732 hints.ai_socktype = SOCK_DGRAM;
734 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
737 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
738 vlc_gai_strerror (val));
742 hints.ai_flags = AI_PASSIVE;
743 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
746 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
747 vlc_gai_strerror (val));
748 vlc_freeaddrinfo (rem);
752 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
754 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
755 protocol ?: ptr->ai_protocol);
757 continue; // usually, address family not supported
760 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
764 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
765 * to avoid packet loss caused in case of scheduling hiccups */
766 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
767 (void *)&(int){ 0x80000 }, sizeof (int));
768 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
769 (void *)&(int){ 0x80000 }, sizeof (int));
772 #if defined (WIN32) || defined (UNDER_CE)
773 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
774 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
776 // This works for IPv4 too - don't worry!
777 struct sockaddr_in6 dumb =
779 .sin6_family = ptr->ai_addr->sa_family,
780 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
783 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
787 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
794 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
796 if ((ptr2->ai_family != ptr->ai_family)
797 || (ptr2->ai_socktype != ptr->ai_socktype)
798 || (ptr2->ai_protocol != ptr->ai_protocol))
801 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
802 ? net_SourceSubscribe (obj, fd,
803 ptr2->ai_addr, ptr2->ai_addrlen,
804 ptr->ai_addr, ptr->ai_addrlen)
805 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
807 msg_Err (obj, "cannot connect to %s port %d: %m",
808 psz_server, i_server);
821 vlc_freeaddrinfo (rem);
822 vlc_freeaddrinfo (loc);
829 * Sets the send and receive checksum coverage of a socket:
831 * @param sendcov payload coverage of sent packets (bytes), -1 for full
832 * @param recvcov minimum payload coverage of received packets, -1 for full
834 int net_SetCSCov (int fd, int sendcov, int recvcov)
838 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
839 &type, &(socklen_t){ sizeof (type) }))
844 #ifdef UDPLITE_RECV_CSCOV
845 case SOCK_DGRAM: /* UDP-Lite */
849 sendcov += 8; /* partial */
850 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
858 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
859 &recvcov, sizeof (recvcov)))
864 #ifdef DCCP_SOCKOPT_SEND_CSCOV
865 case SOCK_DCCP: /* DCCP and its ill-named socket type */
866 if ((sendcov == -1) || (sendcov > 56))
869 sendcov = (sendcov + 3) / 4;
870 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
871 &sendcov, sizeof (sendcov)))
874 if ((recvcov == -1) || (recvcov > 56))
877 recvcov = (recvcov + 3) / 4;
878 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
879 &recvcov, sizeof (recvcov)))
885 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )