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
55 #ifdef HAVE_LINUX_DCCP_H
56 # include <linux/dccp.h>
57 # ifndef SOCK_DCCP /* provisional API */
63 # define SOL_IP IPPROTO_IP
66 # define SOL_IPV6 IPPROTO_IPV6
69 # define IPPROTO_IPV6 41 /* IANA */
72 # define SOL_DCCP IPPROTO_DCCP
75 # define IPPROTO_DCCP 33 /* IANA */
78 # define SOL_UDPLITE IPPROTO_UDPLITE
80 #ifndef IPPROTO_UDPLITE
81 # define IPPROTO_UDPLITE 136 /* IANA */
84 #if defined (HAVE_NETINET_UDPLITE_H)
85 # include <netinet/udplite.h>
86 #elif defined (__linux__)
87 /* still missing from glibc 2.6 */
88 # define UDPLITE_SEND_CSCOV 10
89 # define UDPLITE_RECV_CSCOV 11
92 extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
96 static int net_SetupDgramSocket( vlc_object_t *p_obj, int fd, const struct addrinfo *ptr )
99 setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
103 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
104 * to avoid packet loss caused in case of scheduling hiccups */
105 setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
106 (void *)&(int){ 0x80000 }, sizeof (int));
107 setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
108 (void *)&(int){ 0x80000 }, sizeof (int));
111 #if defined (WIN32) || defined (UNDER_CE)
112 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
113 && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
115 // This works for IPv4 too - don't worry!
116 struct sockaddr_in6 dumb =
118 .sin6_family = ptr->ai_addr->sa_family,
119 .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
122 bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
126 if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
128 msg_Err( p_obj, "socket bind error (%m)" );
136 static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
139 struct addrinfo hints, *res;
141 memset (&hints, 0, sizeof( hints ));
142 hints.ai_socktype = SOCK_DGRAM;
143 hints.ai_protocol = protocol;
144 hints.ai_flags = AI_PASSIVE;
149 msg_Dbg (obj, "net: opening %s datagram port %d",
150 host ? host : "any", port);
152 int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
155 msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
162 for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
164 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
168 msg_Dbg (obj, "socket error: %m");
173 /* Try dual-mode IPv6 if available. */
174 if (ptr->ai_family == AF_INET6)
175 setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 }, sizeof (int));
177 fd = net_SetupDgramSocket( obj, fd, ptr );
181 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
182 && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
197 static int net_SetMcastHopLimit( vlc_object_t *p_this,
198 int fd, int family, int hlim )
202 /* There is some confusion in the world whether IP_MULTICAST_TTL
203 * takes a byte or an int as an argument.
204 * BSD seems to indicate byte so we are going with that and use
205 * int as a fallback to be safe */
208 #ifdef IP_MULTICAST_TTL
211 cmd = IP_MULTICAST_TTL;
215 #ifdef IPV6_MULTICAST_HOPS
218 cmd = IPV6_MULTICAST_HOPS;
223 errno = EAFNOSUPPORT;
224 msg_Warn( p_this, "%m" );
228 if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
230 /* BSD compatibility */
233 msg_Dbg( p_this, "cannot set hop limit (%d): %m", hlim );
234 buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
235 if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
237 msg_Err( p_this, "cannot set hop limit (%d): %m", hlim );
246 static int net_SetMcastOutIface (int fd, int family, int scope)
250 #ifdef IPV6_MULTICAST_IF
252 return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
253 &scope, sizeof (scope));
259 struct ip_mreqn req = { .imr_ifindex = scope };
261 return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
267 errno = EAFNOSUPPORT;
272 static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
274 #ifdef IP_MULTICAST_IF
275 return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
277 errno = EAFNOSUPPORT;
283 static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
284 const char *iface, const char *addr)
288 int scope = if_nametoindex (iface);
291 msg_Err (p_this, "invalid multicast interface: %s", iface);
295 if (net_SetMcastOutIface (fd, family, scope) == 0)
298 msg_Err (p_this, "%s: %m", iface);
303 if (family == AF_INET)
306 if (inet_pton (AF_INET, addr, &ipv4) <= 0)
308 msg_Err (p_this, "invalid IPv4 address for multicast: %s",
313 if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
316 msg_Err (p_this, "%s: %m", addr);
325 * Old-style any-source multicast join.
326 * In use on Windows XP/2003 and older.
329 net_IPv4Join (vlc_object_t *obj, int fd,
330 const struct sockaddr_in *src, const struct sockaddr_in *grp)
332 #ifdef IP_ADD_MEMBERSHIP
336 # ifdef IP_ADD_SOURCE_MEMBERSHIP
337 struct ip_mreq_source gsr4;
341 struct in_addr id = { .s_addr = INADDR_ANY };
344 /* Multicast interface IPv4 address */
345 char *iface = var_InheritString (obj, "miface-addr");
347 && (inet_pton (AF_INET, iface, &id) <= 0))
349 msg_Err (obj, "invalid multicast interface address %s", iface);
355 memset (&opt, 0, sizeof (opt));
358 # if defined( IP_ADD_SOURCE_MEMBERSHIP ) && !defined( __ANDROID__ )
359 cmd = IP_ADD_SOURCE_MEMBERSHIP;
360 opt.gsr4.imr_multiaddr = grp->sin_addr;
361 opt.gsr4.imr_sourceaddr = src->sin_addr;
362 opt.gsr4.imr_interface = id;
363 optlen = sizeof (opt.gsr4);
371 cmd = IP_ADD_MEMBERSHIP;
372 opt.gr4.imr_multiaddr = grp->sin_addr;
373 opt.gr4.imr_interface = id;
374 optlen = sizeof (opt.gr4);
377 msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
378 (src != NULL) ? "SOURCE_" : "");
380 if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
386 msg_Err (obj, "cannot join IPv4 multicast group (%m)");
392 net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
394 #ifdef IPV6_JOIN_GROUP
395 struct ipv6_mreq gr6;
396 memset (&gr6, 0, sizeof (gr6));
397 gr6.ipv6mr_interface = src->sin6_scope_id;
398 memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
400 msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
402 if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
408 msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
413 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
415 * I hate manual definitions: Error-prone. Portability hell.
416 * Developers shall use UP-TO-DATE compilers. Full point.
417 * If you remove the warning, you remove the whole ifndef.
419 # warning Your C headers are out-of-date. Please update.
421 # define MCAST_JOIN_GROUP 41
422 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
426 * IP-agnostic multicast join,
427 * with fallback to old APIs, and fallback from SSM to ASM.
430 net_SourceSubscribe (vlc_object_t *obj, int fd,
431 const struct sockaddr *src, socklen_t srclen,
432 const struct sockaddr *grp, socklen_t grplen)
436 char *iface = var_InheritString (obj, "miface");
439 iid = if_nametoindex (iface);
442 msg_Err (obj, "invalid multicast interface: %s", iface);
449 switch (grp->sa_family)
454 if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
455 iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
464 errno = EAFNOSUPPORT;
469 switch (src->sa_family)
473 if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
474 &in6addr_any, sizeof (in6addr_any)) == 0)
480 if (((const struct sockaddr_in *)src)->sin_addr.s_addr
487 /* Agnostic ASM/SSM multicast join */
488 #ifdef MCAST_JOIN_SOURCE_GROUP
492 struct group_source_req gsr;
496 memset (&opt, 0, sizeof (opt));
500 if ((grplen > sizeof (opt.gsr.gsr_group))
501 || (srclen > sizeof (opt.gsr.gsr_source)))
504 opt.gsr.gsr_interface = iid;
505 memcpy (&opt.gsr.gsr_source, src, srclen);
506 memcpy (&opt.gsr.gsr_group, grp, grplen);
507 optlen = sizeof (opt.gsr);
511 if (grplen > sizeof (opt.gr.gr_group))
514 opt.gr.gr_interface = iid;
515 memcpy (&opt.gr.gr_group, grp, grplen);
516 optlen = sizeof (opt.gr);
519 msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
521 if (setsockopt (fd, level,
522 src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
523 (void *)&opt, optlen) == 0)
527 /* Fallback to IPv-specific APIs */
528 if ((src != NULL) && (src->sa_family != grp->sa_family))
531 switch (grp->sa_family)
534 if ((grplen < sizeof (struct sockaddr_in))
535 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
538 if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
539 (const struct sockaddr_in *)grp) == 0)
545 if ((grplen < sizeof (struct sockaddr_in6))
546 || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
549 /* IPv6-specific SSM API does not exist. So if we're here
550 * it means IPv6 SSM is not supported on this OS and we
551 * directly fallback to ASM */
553 if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
559 msg_Err (obj, "Multicast group join error (%m)");
563 msg_Warn (obj, "Trying ASM instead of SSM...");
564 return net_Subscribe (obj, fd, grp, grplen);
567 msg_Err (obj, "Multicast not supported");
572 int net_Subscribe (vlc_object_t *obj, int fd,
573 const struct sockaddr *addr, socklen_t addrlen)
575 return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
579 static int net_SetDSCP( int fd, uint8_t dscp )
581 struct sockaddr_storage addr;
582 if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
587 switch( addr.ss_family )
608 return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
611 #undef net_ConnectDgram
612 /*****************************************************************************
614 *****************************************************************************
615 * Open a datagram socket to send data to a defined destination, with an
616 * optional hop limit.
617 *****************************************************************************/
618 int net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
619 int i_hlim, int proto )
621 struct addrinfo hints, *res, *ptr;
622 int i_val, i_handle = -1;
623 bool b_unreach = false;
626 i_hlim = var_InheritInteger( p_this, "ttl" );
628 memset( &hints, 0, sizeof( hints ) );
629 hints.ai_socktype = SOCK_DGRAM;
630 hints.ai_protocol = proto;
632 msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
634 i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
637 msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
638 gai_strerror( i_val ) );
642 for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
645 int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
650 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
651 * to avoid packet loss caused by scheduling problems */
652 setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
653 setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
655 /* Allow broadcast sending */
656 setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
659 net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
661 str = var_InheritString (p_this, "miface");
664 net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
668 str = var_InheritString (p_this, "miface-addr");
671 net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
675 net_SetDSCP (fd, var_InheritInteger (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 )
692 msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
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, int protocol )
720 if ((psz_server == NULL) || (psz_server[0] == '\0'))
721 return net_ListenSingle (obj, psz_bind, i_bind, protocol);
723 msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
724 psz_server, i_server, psz_bind, i_bind);
726 struct addrinfo hints, *loc, *rem;
729 memset (&hints, 0, sizeof (hints));
730 hints.ai_socktype = SOCK_DGRAM;
731 hints.ai_protocol = protocol;
733 val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
736 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
741 hints.ai_flags = AI_PASSIVE;
742 val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
745 msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
752 for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
754 int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
757 continue; // usually, address family not supported
759 fd = net_SetupDgramSocket( obj, fd, ptr );
763 for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
765 if ((ptr2->ai_family != ptr->ai_family)
766 || (ptr2->ai_socktype != ptr->ai_socktype)
767 || (ptr2->ai_protocol != ptr->ai_protocol))
770 if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
771 ? net_SourceSubscribe (obj, fd,
772 ptr2->ai_addr, ptr2->ai_addrlen,
773 ptr->ai_addr, ptr->ai_addrlen)
774 : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
776 msg_Err (obj, "cannot connect to %s port %d: %m",
777 psz_server, i_server);
798 * Sets the send and receive checksum coverage of a socket:
800 * @param sendcov payload coverage of sent packets (bytes), -1 for full
801 * @param recvcov minimum payload coverage of received packets, -1 for full
803 int net_SetCSCov (int fd, int sendcov, int recvcov)
807 if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
808 &type, &(socklen_t){ sizeof (type) }))
813 #ifdef UDPLITE_RECV_CSCOV
814 case SOCK_DGRAM: /* UDP-Lite */
818 sendcov += 8; /* partial */
819 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
827 if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
828 &recvcov, sizeof (recvcov)))
833 #ifdef DCCP_SOCKOPT_SEND_CSCOV
834 case SOCK_DCCP: /* DCCP and its ill-named socket type */
835 if ((sendcov == -1) || (sendcov > 56))
838 sendcov = (sendcov + 3) / 4;
839 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
840 &sendcov, sizeof (sendcov)))
843 if ((recvcov == -1) || (recvcov > 56))
846 recvcov = (recvcov + 3) / 4;
847 if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
848 &recvcov, sizeof (recvcov)))
854 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )