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
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
,
97 static int net_SetupDgramSocket( vlc_object_t
*p_obj
, int fd
, const struct addrinfo
*ptr
)
100 setsockopt (fd
, SOL_SOCKET
, SO_REUSEPORT
, &(int){ 1 }, sizeof (int));
104 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
105 * to avoid packet loss caused in case of scheduling hiccups */
106 setsockopt (fd
, SOL_SOCKET
, SO_RCVBUF
,
107 (void *)&(int){ 0x80000 }, sizeof (int));
108 setsockopt (fd
, SOL_SOCKET
, SO_SNDBUF
,
109 (void *)&(int){ 0x80000 }, sizeof (int));
112 #if defined (WIN32) || defined (UNDER_CE)
113 if (net_SockAddrIsMulticast (ptr
->ai_addr
, ptr
->ai_addrlen
)
114 && (sizeof (struct sockaddr_storage
) >= ptr
->ai_addrlen
))
116 // This works for IPv4 too - don't worry!
117 struct sockaddr_in6 dumb
=
119 .sin6_family
= ptr
->ai_addr
->sa_family
,
120 .sin6_port
= ((struct sockaddr_in
*)(ptr
->ai_addr
))->sin_port
123 bind (fd
, (struct sockaddr
*)&dumb
, ptr
->ai_addrlen
);
127 if (bind (fd
, ptr
->ai_addr
, ptr
->ai_addrlen
))
129 msg_Err( p_obj
, "socket bind error (%m)" );
137 static int net_ListenSingle (vlc_object_t
*obj
, const char *host
, int port
,
138 int family
, int protocol
)
140 struct addrinfo hints
, *res
;
142 memset (&hints
, 0, sizeof( hints
));
143 hints
.ai_family
= family
;
144 hints
.ai_socktype
= SOCK_DGRAM
;
145 hints
.ai_protocol
= protocol
;
146 hints
.ai_flags
= AI_PASSIVE
;
151 msg_Dbg (obj
, "net: opening %s datagram port %d",
152 host
? host
: "any", port
);
154 int val
= vlc_getaddrinfo (obj
, host
, port
, &hints
, &res
);
157 msg_Err (obj
, "Cannot resolve %s port %d : %s", host
, port
,
164 for (const struct addrinfo
*ptr
= res
; ptr
!= NULL
; ptr
= ptr
->ai_next
)
166 int fd
= net_Socket (obj
, ptr
->ai_family
, ptr
->ai_socktype
,
170 msg_Dbg (obj
, "socket error: %m");
175 /* If IPv6 was forced, set IPv6-only mode.
176 * If IPv4 was forced, do nothing extraordinary.
177 * If nothing was forced, try dual-mode IPv6. */
178 if (ptr
->ai_family
== AF_INET6
)
180 int on
= (family
== AF_INET6
);
181 setsockopt (fd
, SOL_IPV6
, IPV6_V6ONLY
, &on
, sizeof (on
));
183 if (ptr
->ai_family
== AF_INET
)
185 if (family
== AF_UNSPEC
&& ptr
->ai_next
!= NULL
)
187 msg_Warn (obj
, "ambiguous network protocol specification");
188 msg_Warn (obj
, "please select IP version explicitly");
191 fd
= net_SetupDgramSocket( obj
, fd
, ptr
);
195 if (net_SockAddrIsMulticast (ptr
->ai_addr
, ptr
->ai_addrlen
)
196 && net_Subscribe (obj
, fd
, ptr
->ai_addr
, ptr
->ai_addrlen
))
211 static int net_SetMcastHopLimit( vlc_object_t
*p_this
,
212 int fd
, int family
, int hlim
)
216 /* There is some confusion in the world whether IP_MULTICAST_TTL
217 * takes a byte or an int as an argument.
218 * BSD seems to indicate byte so we are going with that and use
219 * int as a fallback to be safe */
222 #ifdef IP_MULTICAST_TTL
225 cmd
= IP_MULTICAST_TTL
;
229 #ifdef IPV6_MULTICAST_HOPS
232 cmd
= IPV6_MULTICAST_HOPS
;
237 errno
= EAFNOSUPPORT
;
238 msg_Warn( p_this
, "%m" );
242 if( setsockopt( fd
, proto
, cmd
, &hlim
, sizeof( hlim
) ) < 0 )
244 /* BSD compatibility */
247 msg_Dbg( p_this
, "cannot set hop limit (%d): %m", hlim
);
248 buf
= (unsigned char)(( hlim
> 255 ) ? 255 : hlim
);
249 if( setsockopt( fd
, proto
, cmd
, &buf
, sizeof( buf
) ) )
251 msg_Err( p_this
, "cannot set hop limit (%d): %m", hlim
);
260 static int net_SetMcastOutIface (int fd
, int family
, int scope
)
264 #ifdef IPV6_MULTICAST_IF
266 return setsockopt (fd
, SOL_IPV6
, IPV6_MULTICAST_IF
,
267 &scope
, sizeof (scope
));
273 struct ip_mreqn req
= { .imr_ifindex
= scope
};
275 return setsockopt (fd
, SOL_IP
, IP_MULTICAST_IF
, &req
,
281 errno
= EAFNOSUPPORT
;
286 static inline int net_SetMcastOutIPv4 (int fd
, struct in_addr ipv4
)
288 #ifdef IP_MULTICAST_IF
289 return setsockopt( fd
, SOL_IP
, IP_MULTICAST_IF
, &ipv4
, sizeof (ipv4
));
291 errno
= EAFNOSUPPORT
;
297 static int net_SetMcastOut (vlc_object_t
*p_this
, int fd
, int family
,
298 const char *iface
, const char *addr
)
302 int scope
= if_nametoindex (iface
);
305 msg_Err (p_this
, "invalid multicast interface: %s", iface
);
309 if (net_SetMcastOutIface (fd
, family
, scope
) == 0)
312 msg_Err (p_this
, "%s: %m", iface
);
317 if (family
== AF_INET
)
320 if (inet_pton (AF_INET
, addr
, &ipv4
) <= 0)
322 msg_Err (p_this
, "invalid IPv4 address for multicast: %s",
327 if (net_SetMcastOutIPv4 (fd
, ipv4
) == 0)
330 msg_Err (p_this
, "%s: %m", addr
);
339 * Old-style any-source multicast join.
340 * In use on Windows XP/2003 and older.
343 net_IPv4Join (vlc_object_t
*obj
, int fd
,
344 const struct sockaddr_in
*src
, const struct sockaddr_in
*grp
)
346 #ifdef IP_ADD_MEMBERSHIP
350 # ifdef IP_ADD_SOURCE_MEMBERSHIP
351 struct ip_mreq_source gsr4
;
355 struct in_addr id
= { .s_addr
= INADDR_ANY
};
358 /* Multicast interface IPv4 address */
359 char *iface
= var_CreateGetNonEmptyString (obj
, "miface-addr");
361 && (inet_pton (AF_INET
, iface
, &id
) <= 0))
363 msg_Err (obj
, "invalid multicast interface address %s", iface
);
369 memset (&opt
, 0, sizeof (opt
));
372 # ifdef IP_ADD_SOURCE_MEMBERSHIP
373 cmd
= IP_ADD_SOURCE_MEMBERSHIP
;
374 opt
.gsr4
.imr_multiaddr
= grp
->sin_addr
;
375 opt
.gsr4
.imr_sourceaddr
= src
->sin_addr
;
376 opt
.gsr4
.imr_interface
= id
;
377 optlen
= sizeof (opt
.gsr4
);
385 cmd
= IP_ADD_MEMBERSHIP
;
386 opt
.gr4
.imr_multiaddr
= grp
->sin_addr
;
387 opt
.gr4
.imr_interface
= id
;
388 optlen
= sizeof (opt
.gr4
);
391 msg_Dbg (obj
, "IP_ADD_%sMEMBERSHIP multicast request",
392 (src
!= NULL
) ? "SOURCE_" : "");
394 if (setsockopt (fd
, SOL_IP
, cmd
, &opt
, optlen
) == 0)
400 msg_Err (obj
, "cannot join IPv4 multicast group (%m)");
406 net_IPv6Join (vlc_object_t
*obj
, int fd
, const struct sockaddr_in6
*src
)
408 #ifdef IPV6_JOIN_GROUP
409 struct ipv6_mreq gr6
;
410 memset (&gr6
, 0, sizeof (gr6
));
411 gr6
.ipv6mr_interface
= src
->sin6_scope_id
;
412 memcpy (&gr6
.ipv6mr_multiaddr
, &src
->sin6_addr
, 16);
414 msg_Dbg (obj
, "IPV6_JOIN_GROUP multicast request");
416 if (!setsockopt (fd
, SOL_IPV6
, IPV6_JOIN_GROUP
, &gr6
, sizeof (gr6
)))
422 msg_Err (obj
, "cannot join IPv6 any-source multicast group (%m)");
427 #if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
429 * I hate manual definitions: Error-prone. Portability hell.
430 * Developers shall use UP-TO-DATE compilers. Full point.
431 * If you remove the warning, you remove the whole ifndef.
433 # warning Your C headers are out-of-date. Please update.
435 # define MCAST_JOIN_GROUP 41
439 struct sockaddr_storage gr_group
;
442 # define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
443 struct group_source_req
445 uint32_t gsr_interface
;
446 struct sockaddr_storage gsr_group
;
447 struct sockaddr_storage gsr_source
;
452 * IP-agnostic multicast join,
453 * with fallback to old APIs, and fallback from SSM to ASM.
456 net_SourceSubscribe (vlc_object_t
*obj
, int fd
,
457 const struct sockaddr
*src
, socklen_t srclen
,
458 const struct sockaddr
*grp
, socklen_t grplen
)
462 char *iface
= var_CreateGetNonEmptyString (obj
, "miface");
465 iid
= if_nametoindex (iface
);
468 msg_Err (obj
, "invalid multicast interface: %s", iface
);
475 switch (grp
->sa_family
)
480 if (((const struct sockaddr_in6
*)grp
)->sin6_scope_id
)
481 iid
= ((const struct sockaddr_in6
*)grp
)->sin6_scope_id
;
490 errno
= EAFNOSUPPORT
;
495 switch (src
->sa_family
)
499 if (memcmp (&((const struct sockaddr_in6
*)src
)->sin6_addr
,
500 &in6addr_any
, sizeof (in6addr_any
)) == 0)
506 if (((const struct sockaddr_in
*)src
)->sin_addr
.s_addr
513 /* Agnostic ASM/SSM multicast join */
514 #ifdef MCAST_JOIN_SOURCE_GROUP
518 struct group_source_req gsr
;
522 memset (&opt
, 0, sizeof (opt
));
526 if ((grplen
> sizeof (opt
.gsr
.gsr_group
))
527 || (srclen
> sizeof (opt
.gsr
.gsr_source
)))
530 opt
.gsr
.gsr_interface
= iid
;
531 memcpy (&opt
.gsr
.gsr_source
, src
, srclen
);
532 memcpy (&opt
.gsr
.gsr_group
, grp
, grplen
);
533 optlen
= sizeof (opt
.gsr
);
537 if (grplen
> sizeof (opt
.gr
.gr_group
))
540 opt
.gr
.gr_interface
= iid
;
541 memcpy (&opt
.gr
.gr_group
, grp
, grplen
);
542 optlen
= sizeof (opt
.gr
);
545 msg_Dbg (obj
, "Multicast %sgroup join request", src
? "source " : "");
547 if (setsockopt (fd
, level
,
548 src
? MCAST_JOIN_SOURCE_GROUP
: MCAST_JOIN_GROUP
,
549 (void *)&opt
, optlen
) == 0)
553 /* Fallback to IPv-specific APIs */
554 if ((src
!= NULL
) && (src
->sa_family
!= grp
->sa_family
))
557 switch (grp
->sa_family
)
560 if ((grplen
< sizeof (struct sockaddr_in
))
561 || ((src
!= NULL
) && (srclen
< sizeof (struct sockaddr_in
))))
564 if (net_IPv4Join (obj
, fd
, (const struct sockaddr_in
*)src
,
565 (const struct sockaddr_in
*)grp
) == 0)
571 if ((grplen
< sizeof (struct sockaddr_in6
))
572 || ((src
!= NULL
) && (srclen
< sizeof (struct sockaddr_in6
))))
575 /* IPv6-specific SSM API does not exist. So if we're here
576 * it means IPv6 SSM is not supported on this OS and we
577 * directly fallback to ASM */
579 if (net_IPv6Join (obj
, fd
, (const struct sockaddr_in6
*)grp
) == 0)
585 msg_Err (obj
, "Multicast group join error (%m)");
589 msg_Warn (obj
, "Trying ASM instead of SSM...");
590 return net_Subscribe (obj
, fd
, grp
, grplen
);
593 msg_Err (obj
, "Multicast not supported");
598 int net_Subscribe (vlc_object_t
*obj
, int fd
,
599 const struct sockaddr
*addr
, socklen_t addrlen
)
601 return net_SourceSubscribe (obj
, fd
, NULL
, 0, addr
, addrlen
);
605 static int net_SetDSCP( int fd
, uint8_t dscp
)
607 struct sockaddr_storage addr
;
608 if( getsockname( fd
, (struct sockaddr
*)&addr
, &(socklen_t
){ sizeof (addr
) }) )
613 switch( addr
.ss_family
)
634 return setsockopt( fd
, level
, cmd
, &(int){ dscp
}, sizeof (int));
637 #undef net_ConnectDgram
638 /*****************************************************************************
640 *****************************************************************************
641 * Open a datagram socket to send data to a defined destination, with an
642 * optional hop limit.
643 *****************************************************************************/
644 int net_ConnectDgram( vlc_object_t
*p_this
, const char *psz_host
, int i_port
,
645 int i_hlim
, int proto
)
647 struct addrinfo hints
, *res
, *ptr
;
648 int i_val
, i_handle
= -1;
649 bool b_unreach
= false;
652 i_hlim
= var_CreateGetInteger( p_this
, "ttl" );
654 memset( &hints
, 0, sizeof( hints
) );
655 hints
.ai_socktype
= SOCK_DGRAM
;
656 hints
.ai_protocol
= proto
;
658 msg_Dbg( p_this
, "net: connecting to [%s]:%d", psz_host
, i_port
);
660 i_val
= vlc_getaddrinfo( p_this
, psz_host
, i_port
, &hints
, &res
);
663 msg_Err( p_this
, "cannot resolve [%s]:%d : %s", psz_host
, i_port
,
664 gai_strerror( i_val
) );
668 for( ptr
= res
; ptr
!= NULL
; ptr
= ptr
->ai_next
)
671 int fd
= net_Socket (p_this
, ptr
->ai_family
, ptr
->ai_socktype
,
676 #if !defined( SYS_BEOS )
677 /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
678 * to avoid packet loss caused by scheduling problems */
679 setsockopt (fd
, SOL_SOCKET
, SO_RCVBUF
, &(int){ 0x80000 }, sizeof (int));
680 setsockopt (fd
, SOL_SOCKET
, SO_SNDBUF
, &(int){ 0x80000 }, sizeof (int));
682 /* Allow broadcast sending */
683 setsockopt (fd
, SOL_SOCKET
, SO_BROADCAST
, &(int){ 1 }, sizeof (int));
687 net_SetMcastHopLimit( p_this
, fd
, ptr
->ai_family
, i_hlim
);
689 str
= var_CreateGetNonEmptyString (p_this
, "miface");
692 net_SetMcastOut (p_this
, fd
, ptr
->ai_family
, str
, NULL
);
696 str
= var_CreateGetNonEmptyString (p_this
, "miface-addr");
699 net_SetMcastOut (p_this
, fd
, ptr
->ai_family
, NULL
, str
);
703 net_SetDSCP (fd
, var_CreateGetInteger (p_this
, "dscp"));
705 if( connect( fd
, ptr
->ai_addr
, ptr
->ai_addrlen
) == 0 )
712 #if defined( WIN32 ) || defined( UNDER_CE )
713 if( WSAGetLastError () == WSAENETUNREACH
)
715 if( errno
== ENETUNREACH
)
720 msg_Warn( p_this
, "%s port %d : %m", psz_host
, i_port
);
731 msg_Err( p_this
, "Host %s port %d is unreachable", psz_host
,
740 /*****************************************************************************
742 *****************************************************************************
743 * OpenDgram a datagram socket and return a handle
744 *****************************************************************************/
745 int net_OpenDgram( vlc_object_t
*obj
, const char *psz_bind
, int i_bind
,
746 const char *psz_server
, int i_server
,
747 int family
, int protocol
)
749 if ((psz_server
== NULL
) || (psz_server
[0] == '\0'))
750 return net_ListenSingle (obj
, psz_bind
, i_bind
, family
, protocol
);
752 msg_Dbg (obj
, "net: connecting to [%s]:%d from [%s]:%d",
753 psz_server
, i_server
, psz_bind
, i_bind
);
755 struct addrinfo hints
, *loc
, *rem
;
758 memset (&hints
, 0, sizeof (hints
));
759 hints
.ai_family
= family
;
760 hints
.ai_socktype
= SOCK_DGRAM
;
761 hints
.ai_protocol
= protocol
;
763 val
= vlc_getaddrinfo (obj
, psz_server
, i_server
, &hints
, &rem
);
766 msg_Err (obj
, "cannot resolve %s port %d : %s", psz_bind
, i_bind
,
771 hints
.ai_flags
= AI_PASSIVE
;
772 val
= vlc_getaddrinfo (obj
, psz_bind
, i_bind
, &hints
, &loc
);
775 msg_Err (obj
, "cannot resolve %s port %d : %s", psz_bind
, i_bind
,
781 for (struct addrinfo
*ptr
= loc
; ptr
!= NULL
; ptr
= ptr
->ai_next
)
783 int fd
= net_Socket (obj
, ptr
->ai_family
, ptr
->ai_socktype
,
786 continue; // usually, address family not supported
788 fd
= net_SetupDgramSocket( obj
, fd
, ptr
);
793 for (struct addrinfo
*ptr2
= rem
; ptr2
!= NULL
; ptr2
= ptr2
->ai_next
)
795 if ((ptr2
->ai_family
!= ptr
->ai_family
)
796 || (ptr2
->ai_socktype
!= ptr
->ai_socktype
)
797 || (ptr2
->ai_protocol
!= ptr
->ai_protocol
))
800 if (net_SockAddrIsMulticast (ptr
->ai_addr
, ptr
->ai_addrlen
)
801 ? net_SourceSubscribe (obj
, fd
,
802 ptr2
->ai_addr
, ptr2
->ai_addrlen
,
803 ptr
->ai_addr
, ptr
->ai_addrlen
)
804 : connect (fd
, ptr2
->ai_addr
, ptr2
->ai_addrlen
))
806 msg_Err (obj
, "cannot connect to %s port %d: %m",
807 psz_server
, i_server
);
828 * Sets the send and receive checksum coverage of a socket:
830 * @param sendcov payload coverage of sent packets (bytes), -1 for full
831 * @param recvcov minimum payload coverage of received packets, -1 for full
833 int net_SetCSCov (int fd
, int sendcov
, int recvcov
)
837 if (getsockopt (fd
, SOL_SOCKET
, SO_TYPE
,
838 &type
, &(socklen_t
){ sizeof (type
) }))
843 #ifdef UDPLITE_RECV_CSCOV
844 case SOCK_DGRAM
: /* UDP-Lite */
848 sendcov
+= 8; /* partial */
849 if (setsockopt (fd
, SOL_UDPLITE
, UDPLITE_SEND_CSCOV
, &sendcov
,
857 if (setsockopt (fd
, SOL_UDPLITE
, UDPLITE_RECV_CSCOV
,
858 &recvcov
, sizeof (recvcov
)))
863 #ifdef DCCP_SOCKOPT_SEND_CSCOV
864 case SOCK_DCCP
: /* DCCP and its ill-named socket type */
865 if ((sendcov
== -1) || (sendcov
> 56))
868 sendcov
= (sendcov
+ 3) / 4;
869 if (setsockopt (fd
, SOL_DCCP
, DCCP_SOCKOPT_SEND_CSCOV
,
870 &sendcov
, sizeof (sendcov
)))
873 if ((recvcov
== -1) || (recvcov
> 56))
876 recvcov
= (recvcov
+ 3) / 4;
877 if (setsockopt (fd
, SOL_DCCP
, DCCP_SOCKOPT_RECV_CSCOV
,
878 &recvcov
, sizeof (recvcov
)))
884 #if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )