X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fnetwork%2Fudp.c;h=9316cb4aa4130ef4524194c4423efb576a844be8;hb=6ee1e193fd896ab9a4729fde14f009d9ce629815;hp=c5741d15dfb1bf9ea8633d37a627a207fc2ebe33;hpb=2009312e792107d0cf0bf2d1dec225c64ca504a5;p=vlc diff --git a/src/network/udp.c b/src/network/udp.c index c5741d15df..9316cb4aa4 100644 --- a/src/network/udp.c +++ b/src/network/udp.c @@ -2,6 +2,8 @@ * udp.c: ***************************************************************************** * Copyright (C) 2004-2006 the VideoLAN team + * Copyright © 2006-2007 Rémi Denis-Courmont + * * $Id$ * * Authors: Laurent Aimar @@ -25,7 +27,6 @@ /***************************************************************************** * Preamble *****************************************************************************/ -#include #include #include @@ -34,7 +35,7 @@ # include #endif -#include "network.h" +#include #ifdef WIN32 # if defined(UNDER_CE) @@ -47,7 +48,9 @@ # define if_nametoindex( str ) atoi( str ) #else # include -# include +# ifdef HAVE_NET_IF_H +# include +# endif #endif #ifndef SOL_IP @@ -57,29 +60,141 @@ # define SOL_IPV6 IPPROTO_IPV6 #endif #ifndef IPPROTO_IPV6 -# define IPPROTO_IPV6 41 +# define IPPROTO_IPV6 41 /* IANA */ +#endif +#ifndef SOL_DCCP +# define SOL_DCCP IPPROTO_DCCP +#endif +#ifndef IPPROTO_DCCP +# define IPPROTO_DCCP 33 /* IANA */ +#endif +#ifndef SOL_UDPLITE +# define SOL_UDPLITE IPPROTO_UDPLITE +#endif +#ifndef IPPROTO_UDPLITE +# define IPPROTO_UDPLITE 136 /* IANA */ +#endif + +#ifdef __linux__ +# include +# ifndef SOCK_DCCP /* provisional API */ +# define SOCK_DCCP 6 +# endif +#endif + +#if defined (HAVE_NETINET_UDPLITE_H) +# include +#elif defined (__linux__) +/* still missing from glibc 2.6 */ +# define UDPLITE_SEND_CSCOV 10 +# define UDPLITE_RECV_CSCOV 11 #endif extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype, int i_protocol ); +static int net_ListenSingle (vlc_object_t *obj, const char *host, int port, + int family, int protocol) +{ + struct addrinfo hints, *res; + + memset (&hints, 0, sizeof( hints )); + hints.ai_family = family; + hints.ai_socktype = SOCK_DGRAM; + hints.ai_flags = AI_PASSIVE; + + if (host && !*host) + host = NULL; + + msg_Dbg (obj, "net: opening %s datagram port %d", host ?: "any", port); + + int val = vlc_getaddrinfo (obj, host, port, &hints, &res); + if (val) + { + msg_Err (obj, "Cannot resolve %s port %d : %s", host, port, + vlc_gai_strerror (val)); + return -1; + } + + val = -1; + + for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next) + { + int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype, + protocol ?: ptr->ai_protocol); + if (fd == -1) + { + msg_Dbg (obj, "socket error: %s", net_strerror (net_errno)); + continue; + } + + if (ptr->ai_next != NULL) + { +#ifdef IPV6_V6ONLY + if ((ptr->ai_family != AF_INET6) + || setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 }, + sizeof (int))) +#endif + { + msg_Err (obj, "Multiple network protocols present"); + msg_Err (obj, "Please select network protocol manually"); + } + } + + /* Bind the socket */ +#if defined (WIN32) || defined (UNDER_CE) + if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen) + && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen)) + { + struct sockaddr_in6 dumb = + { + .sin6_family = ptr->ai_addr->sa_family, + .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port + }; + bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen); + } + else +#endif + if (bind (fd, ptr->ai_addr, ptr->ai_addrlen)) + { + msg_Err (obj, "socket bind error (%s)", net_strerror (net_errno)); + net_Close (fd); + continue; + } + + if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen) + && net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen)) + { + net_Close (fd); + continue; + } + + val = fd; + break; + } + + vlc_freeaddrinfo (res); + return val; +} + static int net_SetMcastHopLimit( vlc_object_t *p_this, int fd, int family, int hlim ) { -#ifndef SYS_BEOS int proto, cmd; - /* There is some confusion in the world whether IP_MULTICAST_TTL + /* There is some confusion in the world whether IP_MULTICAST_TTL * takes a byte or an int as an argument. * BSD seems to indicate byte so we are going with that and use * int as a fallback to be safe */ switch( family ) { +#ifdef IP_MULTICAST_TTL case AF_INET: proto = SOL_IP; cmd = IP_MULTICAST_TTL; break; +#endif #ifdef IPV6_MULTICAST_HOPS case AF_INET6: @@ -102,76 +217,405 @@ static int net_SetMcastHopLimit( vlc_object_t *p_this, if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) ) return VLC_EGENERIC; } -#endif + return VLC_SUCCESS; } -static int net_SetMcastIface( vlc_object_t *p_this, - int fd, int family, const char *str ) +static int net_SetMcastOutIface (int fd, int family, int scope) { - switch( family ) + switch (family) { -#ifndef SYS_BEOS +#ifdef IPV6_MULTICAST_IF + case AF_INET6: + return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF, + &scope, sizeof (scope)); +#endif + +#ifdef __linux__ case AF_INET: { - struct in_addr addr; + struct ip_mreqn req = { .imr_ifindex = scope }; + + return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req, + sizeof (req)); + } +#endif + } + + errno = EAFNOSUPPORT; + return -1; +} - if( inet_pton( AF_INET, str, &addr) <= 0 ) - { - msg_Err( p_this, "Invalid multicast interface %s", str ); - return VLC_EGENERIC; - } - if( setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &addr, - sizeof( addr ) ) < 0 ) +static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4) +{ +#ifdef IP_MULTICAST_IF + return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4)); +#else + errno = EAFNOSUPPORT; + return -1; +#endif +} + + +static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family, + const char *iface, const char *addr) +{ + if (iface != NULL) + { + int scope = if_nametoindex (iface); + if (scope == 0) + { + msg_Err (p_this, "invalid multicast interface: %s", iface); + return -1; + } + + if (net_SetMcastOutIface (fd, family, scope) == 0) + return 0; + + msg_Err (p_this, "%s: %s", iface, net_strerror (net_errno)); + } + + if (addr != NULL) + { + if (family == AF_INET) + { + struct in_addr ipv4; + if (inet_pton (AF_INET, addr, &ipv4) <= 0) { - msg_Err( p_this, "Cannot use %s as multicast interface: %s", - str, strerror(errno) ); - return VLC_EGENERIC; + msg_Err (p_this, "invalid IPv4 address for multicast: %s", + addr); + return -1; } - break; + + if (net_SetMcastOutIPv4 (fd, ipv4) == 0) + return 0; + + msg_Err (p_this, "%s: %s", addr, net_strerror (net_errno)); } -#endif /* SYS_BEOS */ + } -#ifdef IPV6_MULTICAST_IF - case AF_INET6: + return -1; +} + + +/** + * Old-style any-source multicast join. + * In use on Windows XP/2003 and older. + */ +static int +net_IPv4Join (vlc_object_t *obj, int fd, + const struct sockaddr_in *src, const struct sockaddr_in *grp) +{ +#ifdef IP_ADD_MEMBERSHIP + union + { + struct ip_mreq gr4; +# ifdef IP_ADD_SOURCE_MEMBERSHIP + struct ip_mreq_source gsr4; +# endif + } opt; + int cmd; + struct in_addr id = { .s_addr = INADDR_ANY }; + socklen_t optlen; + + /* Multicast interface IPv4 address */ + char *iface = var_CreateGetString (obj, "miface-addr"); + if (iface != NULL) + { + if ((*iface) + && (inet_pton (AF_INET, iface, &id) <= 0)) { - int scope = if_nametoindex( str ); + msg_Err (obj, "invalid multicast interface address %s", iface); + free (iface); + goto error; + } + } - if( scope == 0 ) - { - msg_Err( p_this, "Invalid multicast interface %s", str ); - return VLC_EGENERIC; - } + memset (&opt, 0, sizeof (opt)); + if (src != NULL) + { +# ifdef IP_ADD_SOURCE_MEMBERSHIP + cmd = IP_ADD_SOURCE_MEMBERSHIP; + opt.gsr4.imr_multiaddr = grp->sin_addr; + opt.gsr4.imr_sourceaddr = src->sin_addr; + opt.gsr4.imr_interface = id; + optlen = sizeof (opt.gsr4); +# else + errno = ENOSYS; + goto error; +# endif + } + else + { + cmd = IP_ADD_MEMBERSHIP; + opt.gr4.imr_multiaddr = grp->sin_addr; + opt.gr4.imr_interface = id; + optlen = sizeof (opt.gr4); + } + + msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request", + (src != NULL) ? "SOURCE_" : ""); + + if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0) + return 0; + +error: +#endif + + msg_Err (obj, "cannot join IPv4 multicast group (%s)", + net_strerror (net_errno)); + return -1; +} + + +static int +net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src) +{ +#ifdef IPV6_JOIN_GROUP + struct ipv6_mreq gr6; + memset (&gr6, 0, sizeof (gr6)); + gr6.ipv6mr_interface = src->sin6_scope_id; + memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16); + + msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request"); + + if (!setsockopt (fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6))) + return 0; +#else + errno = ENOSYS; +#endif + + msg_Err (obj, "cannot join IPv6 any-source multicast group (%s)", + net_strerror (net_errno)); + return -1; +} + + +#if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP) +/* + * I hate manual definitions: Error-prone. Portability hell. + * Developers shall use UP-TO-DATE compilers. Full point. + * If you remove the warning, you remove the whole ifndef. + */ +# warning Your C headers are out-of-date. Please update. + +# define MCAST_JOIN_GROUP 41 +struct group_req +{ + ULONG gr_interface; + struct sockaddr_storage gr_group; +}; - if( setsockopt( fd, SOL_IPV6, IPV6_MULTICAST_IF, - &scope, sizeof( scope ) ) < 0 ) +# define MCAST_JOIN_SOURCE_GROUP 45 /* from */ +struct group_source_req +{ + uint32_t gsr_interface; + struct sockaddr_storage gsr_group; + struct sockaddr_storage gsr_source; +}; +#endif + +/** + * IP-agnostic multicast join, + * with fallback to old APIs, and fallback from SSM to ASM. + */ +static int +net_SourceSubscribe (vlc_object_t *obj, int fd, + const struct sockaddr *src, socklen_t srclen, + const struct sockaddr *grp, socklen_t grplen) +{ + int level, iid = 0; + + char *iface = var_CreateGetString (obj, "miface"); + if (iface != NULL) + { + if (*iface) + { + iid = if_nametoindex (iface); + if (iid == 0) { - msg_Err( p_this, "Cannot use %s as multicast interface: %s", - str, strerror( errno ) ); - return VLC_EGENERIC; + msg_Err (obj, "invalid multicast interface: %s", iface); + free (iface); + return -1; } + } + free (iface); + } + + switch (grp->sa_family) + { +#ifdef AF_INET6 + case AF_INET6: + level = SOL_IPV6; + if (((const struct sockaddr_in6 *)grp)->sin6_scope_id) + iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id; + break; +#endif + + case AF_INET: + level = SOL_IP; break; + + default: + errno = EAFNOSUPPORT; + return -1; + } + + if (src != NULL) + switch (src->sa_family) + { +#ifdef AF_INET6 + case AF_INET6: + if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr, + &in6addr_any, sizeof (in6addr_any)) == 0) + src = NULL; + break; +#endif + + case AF_INET: + if (((const struct sockaddr_in *)src)->sin_addr.s_addr + == INADDR_ANY) + src = NULL; + break; } + + + /* Agnostic ASM/SSM multicast join */ +#ifdef MCAST_JOIN_SOURCE_GROUP + union + { + struct group_req gr; + struct group_source_req gsr; + } opt; + socklen_t optlen; + + memset (&opt, 0, sizeof (opt)); + + if (src != NULL) + { + if ((grplen > sizeof (opt.gsr.gsr_group)) + || (srclen > sizeof (opt.gsr.gsr_source))) + return -1; + + opt.gsr.gsr_interface = iid; + memcpy (&opt.gsr.gsr_source, src, srclen); + memcpy (&opt.gsr.gsr_group, grp, grplen); + optlen = sizeof (opt.gsr); + } + else + { + if (grplen > sizeof (opt.gr.gr_group)) + return -1; + + opt.gr.gr_interface = iid; + memcpy (&opt.gr.gr_group, grp, grplen); + optlen = sizeof (opt.gr); + } + + msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : ""); + + if (setsockopt (fd, level, + src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP, + (void *)&opt, optlen) == 0) + return 0; +#endif + + /* Fallback to IPv-specific APIs */ + if ((src != NULL) && (src->sa_family != grp->sa_family)) + return -1; + + switch (grp->sa_family) + { + case AF_INET: + if ((grplen < sizeof (struct sockaddr_in)) + || ((src != NULL) && (srclen < sizeof (struct sockaddr_in)))) + return -1; + + if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src, + (const struct sockaddr_in *)grp) == 0) + return 0; + break; + +#ifdef AF_INET6 + case AF_INET6: + if ((grplen < sizeof (struct sockaddr_in6)) + || ((src != NULL) && (srclen < sizeof (struct sockaddr_in6)))) + return -1; + + /* IPv6-specific SSM API does not exist. So if we're here + * it means IPv6 SSM is not supported on this OS and we + * directly fallback to ASM */ + + if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0) + return 0; + break; #endif + } + + msg_Err (obj, "Multicast group join error (%s)", + net_strerror (net_errno)); + + if (src != NULL) + { + msg_Warn (obj, "Trying ASM instead of SSM..."); + return net_Subscribe (obj, fd, grp, grplen); + } + + msg_Err (obj, "Multicast not supported"); + return -1; +} + + +int net_Subscribe (vlc_object_t *obj, int fd, + const struct sockaddr *addr, socklen_t addrlen) +{ + return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen); +} + + +static int net_SetDSCP( int fd, uint8_t dscp ) +{ + struct sockaddr_storage addr; + if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) ) + return -1; + + int level, cmd; + + switch( addr.ss_family ) + { +#ifdef IPV6_TCLASS + case AF_INET6: + level = SOL_IPV6; + cmd = IPV6_TCLASS; + break; +#endif + + case AF_INET: + level = SOL_IP; + cmd = IP_TOS; + break; default: - msg_Warn( p_this, "%s", strerror( EAFNOSUPPORT ) ); - return VLC_EGENERIC; +#ifdef ENOPROTOOPT + errno = ENOPROTOOPT; +#endif + return -1; } - return VLC_SUCCESS; + return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int)); } + /***************************************************************************** - * __net_ConnectUDP: + * __net_ConnectDgram: ***************************************************************************** - * Open a UDP socket to send data to a defined destination, with an optional - * hop limit. + * Open a datagram socket to send data to a defined destination, with an + * optional hop limit. *****************************************************************************/ -int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port, - int i_hlim ) +int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port, + int i_hlim, int proto ) { struct addrinfo hints, *res, *ptr; int i_val, i_handle = -1; @@ -198,44 +642,43 @@ int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port, for( ptr = res; ptr != NULL; ptr = ptr->ai_next ) { - int fd; - char *psz_mif; - - fd = net_Socket( p_this, ptr->ai_family, ptr->ai_socktype, - ptr->ai_protocol ); - if( fd == -1 ) + char *str; + int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype, + proto ?: ptr->ai_protocol); + if (fd == -1) continue; + #if !defined( SYS_BEOS ) - else - { - int i_val; - - /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) - * to avoid packet loss caused by scheduling problems */ - i_val = 0x80000; - setsockopt( fd, SOL_SOCKET, SO_RCVBUF, (void *)&i_val, - sizeof( i_val ) ); - i_val = 0x80000; - setsockopt( fd, SOL_SOCKET, SO_SNDBUF, (void *)&i_val, - sizeof( i_val ) ); - - /* Allow broadcast sending */ - i_val = 1; - setsockopt( fd, SOL_SOCKET, SO_BROADCAST, (void*)&i_val, - sizeof( i_val ) ); - } + /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) + * to avoid packet loss caused by scheduling problems */ + setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int)); + setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int)); + + /* Allow broadcast sending */ + setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int)); #endif if( i_hlim > 0 ) net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim ); - psz_mif = config_GetPsz( p_this, (ptr->ai_family != AF_INET) - ? "miface" : "miface-addr" ); - if( psz_mif != NULL ) + + str = var_CreateGetString (p_this, "miface"); + if (str != NULL) + { + if (*str) + net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL); + free (str); + } + + str = var_CreateGetString (p_this, "miface-addr"); + if (str != NULL) { - net_SetMcastIface( p_this, fd, ptr->ai_family, psz_mif ); - free( psz_mif ); + if (*str) + net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str); + free (str); } + net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp")); + if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 ) { /* success */ @@ -271,102 +714,180 @@ int __net_ConnectUDP( vlc_object_t *p_this, const char *psz_host, int i_port, return i_handle; } + /***************************************************************************** - * __net_OpenUDP: + * __net_OpenDgram: ***************************************************************************** - * Open a UDP connection and return a handle + * OpenDgram a datagram socket and return a handle *****************************************************************************/ -int __net_OpenUDP( vlc_object_t *p_this, const char *psz_bind, int i_bind, - const char *psz_server, int i_server ) +int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind, + const char *psz_server, int i_server, + int family, int protocol ) { - vlc_value_t v4, v6; - void *private; - network_socket_t sock; - module_t *p_network = NULL; - - if( ( psz_server != NULL ) && ( psz_server[0] == '\0' ) ) - msg_Warn( p_this, "calling net_OpenUDP with an explicit destination " - "is obsolete - use net_ConnectUDP instead" ); - if( i_server != 0 ) - msg_Warn( p_this, "calling net_OpenUDP with an explicit destination " - "port is obsolete - use __net_ConnectUDP instead" ); - - if( psz_server == NULL ) psz_server = ""; - if( psz_bind == NULL ) psz_bind = ""; - - /* Prepare the network_socket_t structure */ - sock.psz_bind_addr = psz_bind; - sock.i_bind_port = i_bind; - sock.psz_server_addr = psz_server; - sock.i_server_port = i_server; - sock.i_ttl = 0; - sock.v6only = 0; - sock.i_handle = -1; - - msg_Dbg( p_this, "net: connecting to '[%s]:%d@[%s]:%d'", - psz_server, i_server, psz_bind, i_bind ); - - /* Check if we have force ipv4 or ipv6 */ - var_Create( p_this, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT ); - var_Get( p_this, "ipv4", &v4 ); - var_Create( p_this, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT ); - var_Get( p_this, "ipv6", &v6 ); - - if( !v4.b_bool ) + if ((psz_server == NULL) || (psz_server[0] == '\0')) + return net_ListenSingle (obj, psz_bind, i_bind, family, protocol); + + msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d", + psz_server, i_server, psz_bind, i_bind); + + struct addrinfo hints, *loc, *rem; + int val; + + memset (&hints, 0, sizeof (hints)); + hints.ai_family = family; + hints.ai_socktype = SOCK_DGRAM; + + val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem); + if (val) { - if( v6.b_bool ) - sock.v6only = 1; - - /* try IPv6 first (unless IPv4 forced) */ - private = p_this->p_private; - p_this->p_private = (void*)&sock; - p_network = module_Need( p_this, "network", "ipv6", VLC_TRUE ); - - if( p_network != NULL ) - module_Unneed( p_this, p_network ); - - p_this->p_private = private; - - /* - * Check if the IP stack can receive IPv4 packets on IPv6 sockets. - * If yes, then it is better to use the IPv6 socket. - * Otherwise, if we also get an IPv4, we have to choose, so we use - * IPv4 only. - */ - if( ( sock.i_handle != -1 ) && ( ( sock.v6only == 0 ) || v6.b_bool ) ) - return sock.i_handle; + msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind, + vlc_gai_strerror (val)); + return -1; } - if( !v6.b_bool ) + hints.ai_flags = AI_PASSIVE; + val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc); + if (val) { - int fd6 = sock.i_handle; + msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind, + vlc_gai_strerror (val)); + vlc_freeaddrinfo (rem); + return -1; + } - /* also try IPv4 (unless IPv6 forced) */ - private = p_this->p_private; - p_this->p_private = (void*)&sock; - p_network = module_Need( p_this, "network", "ipv4", VLC_TRUE ); + for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next) + { + int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype, + protocol ?: ptr->ai_protocol); + if (fd == -1) + continue; // usually, address family not supported - if( p_network != NULL ) - module_Unneed( p_this, p_network ); +#ifdef SO_REUSEPORT + setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int)); +#endif - p_this->p_private = private; +#ifdef SO_RCVBUF + /* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s) + * to avoid packet loss caused in case of scheduling hiccups */ + setsockopt (fd, SOL_SOCKET, SO_RCVBUF, + (void *)&(int){ 0x80000 }, sizeof (int)); + setsockopt (fd, SOL_SOCKET, SO_SNDBUF, + (void *)&(int){ 0x80000 }, sizeof (int)); +#endif - if( fd6 != -1 ) +#if defined (WIN32) || defined (UNDER_CE) + if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen) + && (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen)) { - if( sock.i_handle != -1 ) + // This works for IPv4 too - don't worry! + struct sockaddr_in6 dumb = { - msg_Warn( p_this, "net: lame IPv6/IPv4 dual-stack present. " - "Using only IPv4." ); - net_Close( fd6 ); + .sin6_family = ptr->ai_addr->sa_family, + .sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port + }; + + bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen); + } + else +#endif + if (bind (fd, ptr->ai_addr, ptr->ai_addrlen)) + { + net_Close (fd); + continue; + } + + val = -1; + for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next) + { + if ((ptr2->ai_family != ptr->ai_family) + || (ptr2->ai_socktype != ptr->ai_socktype) + || (ptr2->ai_protocol != ptr->ai_protocol)) + continue; + + if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen) + ? net_SourceSubscribe (obj, fd, + ptr2->ai_addr, ptr2->ai_addrlen, + ptr->ai_addr, ptr->ai_addrlen) + : connect (fd, ptr2->ai_addr, ptr2->ai_addrlen)) + { + msg_Err (obj, "cannot connect to %s port %d: %s", + psz_server, i_server, net_strerror (net_errno)); + continue; } - else - sock.i_handle = fd6; + val = fd; + break; } + + if (val != -1) + break; + + close (fd); } - if( sock.i_handle == -1 ) - msg_Dbg( p_this, "net: connection to '[%s]:%d@[%s]:%d' failed", - psz_server, i_server, psz_bind, i_bind ); + vlc_freeaddrinfo (rem); + vlc_freeaddrinfo (loc); + return val; +} + + +/** + * net_SetCSCov: + * Sets the send and receive checksum coverage of a socket: + * @param fd socket + * @param sendcov payload coverage of sent packets (bytes), -1 for full + * @param recvcov minimum payload coverage of received packets, -1 for full + */ +int net_SetCSCov (int fd, int sendcov, int recvcov) +{ + int type; + + if (getsockopt (fd, SOL_SOCKET, SO_TYPE, + &type, &(socklen_t){ sizeof (type) })) + return VLC_EGENERIC; + + switch (type) + { +#ifdef UDPLITE_RECV_CSCOV + case SOCK_DGRAM: /* UDP-Lite */ + if (sendcov == -1) + sendcov = 0; + else + sendcov += 8; /* partial */ + if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov, + sizeof (sendcov))) + return VLC_EGENERIC; + + if (recvcov == -1) + recvcov = 0; + else + recvcov += 8; + if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV, + &recvcov, sizeof (recvcov))) + return VLC_EGENERIC; + + return VLC_SUCCESS; +#endif +#ifdef DCCP_SOCKOPT_SEND_CSCOV + case SOCK_DCCP: /* DCCP and its ill-named socket type */ + if ((sendcov == -1) || (sendcov > 56)) + sendcov = 0; + else + sendcov = (sendcov + 3) / 4; + if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV, + &sendcov, sizeof (sendcov))) + return VLC_EGENERIC; + + if ((recvcov == -1) || (recvcov > 56)) + recvcov = 0; + else + recvcov = (recvcov + 3) / 4; + if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV, + &recvcov, sizeof (recvcov))) + return VLC_EGENERIC; + + return VLC_SUCCESS; +#endif + } - return sock.i_handle; + return VLC_EGENERIC; }