#include <vlc_common.h>
#include <errno.h>
+#include <assert.h>
#include <vlc_network.h>
}
-/**
- * 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_InheritString (obj, "miface-addr");
- if ((iface != NULL)
- && (inet_pton (AF_INET, iface, &id) <= 0))
- {
- msg_Err (obj, "invalid multicast interface address %s", iface);
- free (iface);
- goto error;
- }
- free (iface);
-
- memset (&opt, 0, sizeof (opt));
- if (src != NULL)
- {
-# if defined( IP_ADD_SOURCE_MEMBERSHIP ) && !defined( __ANDROID__ )
- 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 (%m)");
- return -1;
-}
-
-
-static int
-net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
+static unsigned var_GetIfIndex (vlc_object_t *obj)
{
-#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, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
+ char *ifname = var_InheritString (obj, "miface");
+ if (ifname == NULL)
return 0;
-#else
- errno = ENOSYS;
-#endif
- msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
- return -1;
+ unsigned ifindex = if_nametoindex (ifname);
+ if (ifindex == 0)
+ msg_Err (obj, "invalid multicast interface: %s", ifname);
+ free (ifname);
+ return ifindex;
}
-#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
-# define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
-#endif
-
/**
* IP-agnostic multicast join,
* with fallback to old APIs, and fallback from SSM to ASM.
const struct sockaddr *src, socklen_t srclen,
const struct sockaddr *grp, socklen_t grplen)
{
- int level, iid = 0;
+#ifdef MCAST_JOIN_SOURCE_GROUP
+ /* Agnostic SSM multicast join */
+ int level;
+ struct group_source_req gsr;
- char *iface = var_InheritString (obj, "miface");
- if (iface != NULL)
- {
- iid = if_nametoindex (iface);
- if (iid == 0)
- {
- msg_Err (obj, "invalid multicast interface: %s", iface);
- free (iface);
- return -1;
- }
- free (iface);
- }
+ memset (&gsr, 0, sizeof (gsr));
+ gsr.gsr_interface = var_GetIfIndex (obj);
switch (grp->sa_family)
{
#ifdef AF_INET6
case AF_INET6:
+ {
+ const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
+
level = SOL_IPV6;
- if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
- iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
+ assert (grplen >= sizeof (struct sockaddr_in6));
+ if (g6->sin6_scope_id != 0)
+ gsr.gsr_interface = g6->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;
- }
-
+ assert (grplen <= sizeof (gsr.gsr_group));
+ memcpy (&gsr.gsr_source, src, srclen);
+ assert (srclen <= sizeof (gsr.gsr_source));
+ memcpy (&gsr.gsr_group, grp, grplen);
+ if (setsockopt (fd, level, MCAST_JOIN_SOURCE_GROUP,
+ &gsr, sizeof (gsr)) == 0)
+ return 0;
- /* Agnostic ASM/SSM multicast join */
-#ifdef MCAST_JOIN_SOURCE_GROUP
- union
+#else
+ if (src->sa_family != grp->sa_family)
{
- struct group_req gr;
- struct group_source_req gsr;
- } opt;
- socklen_t optlen;
-
- memset (&opt, 0, sizeof (opt));
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
- if (src != NULL)
+ switch (grp->sa_family)
{
- 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);
+# ifdef IP_ADD_SOURCE_MEMBERSHIP
+ /* IPv4-specific API */
+ case AF_INET:
+ {
+ struct ip_mreq_source imr;
+
+ memset (&imr, 0, sizeof (imr));
+ assert (grplen >= sizeof (struct sockaddr_in));
+ imr.imr_multiaddr = ((const struct sockaddr_in *)grp)->sin_addr;
+ assert (srclen >= sizeof (struct sockaddr_in));
+ imr.imr_sourceaddr = ((const struct sockaddr_in *)src)->sin_addr;
+ if (setsockopt (fd, SOL_IP, IP_ADD_SOURCE_MEMBERSHIP,
+ &imr, sizeof (imr)) == 0)
+ return 0;
+ break;
+ }
+# endif
+ default:
+ errno = EAFNOSUPPORT;
}
- 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);
- }
+#endif
+ msg_Err (obj, "cannot join source multicast group: %m");
+ msg_Warn (obj, "trying ASM instead of SSM...");
+ return net_Subscribe (obj, fd, grp, grplen);
+}
- 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
+int net_Subscribe (vlc_object_t *obj, int fd,
+ const struct sockaddr *grp, socklen_t grplen)
+{
+#ifdef MCAST_JOIN_GROUP
+ /* Agnostic SSM multicast join */
+ int level;
+ struct group_req gr;
- /* Fallback to IPv-specific APIs */
- if ((src != NULL) && (src->sa_family != grp->sa_family))
- return -1;
+ memset (&gr, 0, sizeof (gr));
+ gr.gr_interface = var_GetIfIndex (obj);
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 */
+ {
+ const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
- if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
- return 0;
+ level = SOL_IPV6;
+ assert (grplen >= sizeof (struct sockaddr_in6));
+ if (g6->sin6_scope_id != 0)
+ gr.gr_interface = g6->sin6_scope_id;
break;
+ }
#endif
+ case AF_INET:
+ level = SOL_IP;
+ break;
+ default:
+ errno = EAFNOSUPPORT;
+ return -1;
}
- msg_Err (obj, "Multicast group join error (%m)");
+ assert (grplen <= sizeof (gr.gr_group));
+ memcpy (&gr.gr_group, grp, grplen);
+ if (setsockopt (fd, level, MCAST_JOIN_GROUP, &gr, sizeof (gr)) == 0)
+ return 0;
- if (src != NULL)
+#else
+ switch (grp->sa_family)
{
- msg_Warn (obj, "Trying ASM instead of SSM...");
- return net_Subscribe (obj, fd, grp, grplen);
+# ifdef IPV6_JOIN_GROUP
+ case AF_INET6:
+ {
+ struct ipv6_mreq ipv6mr;
+ const struct sockaddr_in6 *g6 = (const struct sockaddr_in6 *)grp;
+
+ memset (&ipv6mr, 0, sizeof (ipv6mr));
+ assert (grplen >= sizeof (struct sockaddr_in6));
+ ipv6mr.ipv6mr_multiaddr = g6->sin6_addr;
+ ipv6mr.ipv6mr_interface = g6->sin6_scope_id;
+ if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP,
+ &ipv6mr, sizeof (ipv6mr)))
+ return 0;
+ break;
+ }
+# endif
+# ifdef IP_ADD_MEMBERSHIP
+ case AF_INET:
+ {
+ struct ip_mreq imr;
+
+ memset (&imr, 0, sizeof (imr));
+ assert (grplen >= sizeof (struct sockaddr_in));
+ imr.imr_multiaddr = ((const struct sockaddr_in *)grp)->sin_addr;
+ if (setsockopt (fd, SOL_IP, IP_ADD_MEMBERSHIP,
+ &imr, sizeof (imr)) == 0)
+ return 0;
+ break;
+ }
+# endif
+ default:
+ errno = EAFNOSUPPORT;
}
- msg_Err (obj, "Multicast not supported");
+#endif
+ msg_Err (obj, "cannot join multicast group: %m");
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;
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