X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fudp.c;h=373a4c97a876dee8be3963e930f50f1e08cd6e69;hb=0e729b2290cf2fc8084c18294a46d996c41e3924;hp=bbf8ca2ec6e6190166a8298196dbe3dd882229be;hpb=b5cccea088d6b9a2c24bafd9ba4d8289076a3084;p=ffmpeg

diff --git a/libavformat/udp.c b/libavformat/udp.c
index bbf8ca2ec6e..373a4c97a87 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -1,26 +1,39 @@
 /*
  * UDP prototype streaming system
- * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
+
+/**
+ * @file
+ * UDP protocol
+ */
+
+#define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc */
+
 #include "avformat.h"
-#include <unistd.h>
+#include "avio_internal.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/avstring.h"
+#include "internal.h"
 #include "network.h"
+#include "os_support.h"
+#include "url.h"
 
 #ifndef IPV6_ADD_MEMBERSHIP
 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
@@ -30,95 +43,112 @@
 typedef struct {
     int udp_fd;
     int ttl;
+    int buffer_size;
     int is_multicast;
     int local_port;
     int reuse_socket;
-#ifndef CONFIG_IPV6
-    struct ip_mreq mreq;
-    struct sockaddr_in dest_addr;
-#else
     struct sockaddr_storage dest_addr;
-    size_t dest_addr_len;
-#endif
+    int dest_addr_len;
+    int is_connected;
 } UDPContext;
 
 #define UDP_TX_BUF_SIZE 32768
+#define UDP_MAX_PKT_SIZE 65536
 
-#ifdef CONFIG_IPV6
-
-static int udp_ipv6_is_multicast_address(const struct sockaddr *addr) {
-    if (addr->sa_family == AF_INET)
-        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
-    if (addr->sa_family == AF_INET6)
-        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
-    return -1;
+static void log_net_error(void *ctx, int level, const char* prefix)
+{
+    char errbuf[100];
+    av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
+    av_log(ctx, level, "%s: %s\n", prefix, errbuf);
 }
 
-static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
+static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
+                                 struct sockaddr *addr)
+{
+#ifdef IP_MULTICAST_TTL
     if (addr->sa_family == AF_INET) {
         if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
-            perror("setsockopt(IP_MULTICAST_TTL)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
             return -1;
         }
     }
+#endif
+#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
     if (addr->sa_family == AF_INET6) {
         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
-            perror("setsockopt(IPV6_MULTICAST_HOPS)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
             return -1;
         }
     }
+#endif
     return 0;
 }
 
-static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
-    struct ip_mreq   mreq;
-    struct ipv6_mreq mreq6;
+static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
+{
+#ifdef IP_ADD_MEMBERSHIP
     if (addr->sa_family == AF_INET) {
+        struct ip_mreq mreq;
+
         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
         mreq.imr_interface.s_addr= INADDR_ANY;
         if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
-            perror("setsockopt(IP_ADD_MEMBERSHIP)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
             return -1;
         }
     }
+#endif
+#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
     if (addr->sa_family == AF_INET6) {
+        struct ipv6_mreq mreq6;
+
         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
         mreq6.ipv6mr_interface= 0;
         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
-            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
             return -1;
         }
     }
+#endif
     return 0;
 }
 
-static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
-    struct ip_mreq   mreq;
-    struct ipv6_mreq mreq6;
+static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
+{
+#ifdef IP_DROP_MEMBERSHIP
     if (addr->sa_family == AF_INET) {
+        struct ip_mreq mreq;
+
         mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
         mreq.imr_interface.s_addr= INADDR_ANY;
         if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
-            perror("setsockopt(IP_DROP_MEMBERSHIP)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
             return -1;
         }
     }
+#endif
+#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
     if (addr->sa_family == AF_INET6) {
+        struct ipv6_mreq mreq6;
+
         memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
         mreq6.ipv6mr_interface= 0;
         if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
-            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
+            log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
             return -1;
         }
     }
+#endif
     return 0;
 }
 
-static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
-    struct addrinfo hints, *res = 0;
+static struct addrinfo* udp_resolve_host(const char *hostname, int port,
+                                         int type, int family, int flags)
+{
+    struct addrinfo hints = { 0 }, *res = 0;
     int error;
     char sport[16];
-    const char *node = 0, *service = 0;
+    const char *node = 0, *service = "0";
 
     if (port > 0) {
         snprintf(sport, sizeof(sport), "%d", port);
@@ -127,80 +157,131 @@ static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, in
     if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
         node = hostname;
     }
-    if ((node) || (service)) {
-        memset(&hints, 0, sizeof(hints));
-        hints.ai_socktype = type;
-        hints.ai_family   = family;
-        hints.ai_flags = flags;
-        if ((error = getaddrinfo(node, service, &hints, &res))) {
-            av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
-        }
+    hints.ai_socktype = type;
+    hints.ai_family   = family;
+    hints.ai_flags = flags;
+    if ((error = getaddrinfo(node, service, &hints, &res))) {
+        res = NULL;
+        av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
     }
+
     return res;
 }
 
-static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
-    UDPContext *s = h->priv_data;
-    char hostname[256];
-    int port;
+static int udp_set_multicast_sources(int sockfd, struct sockaddr *addr,
+                                     int addr_len, char **sources,
+                                     int nb_sources, int include)
+{
+#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
+    /* These ones are available in the microsoft SDK, but don't seem to work
+     * as on linux, so just prefer the v4-only approach there for now. */
+    int i;
+    for (i = 0; i < nb_sources; i++) {
+        struct group_source_req mreqs;
+        int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
+        struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
+                                                       SOCK_DGRAM, AF_UNSPEC,
+                                                       AI_NUMERICHOST);
+        if (!sourceaddr)
+            return AVERROR(ENOENT);
+
+        mreqs.gsr_interface = 0;
+        memcpy(&mreqs.gsr_group, addr, addr_len);
+        memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
+        freeaddrinfo(sourceaddr);
+
+        if (setsockopt(sockfd, level,
+                       include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
+                       (const void *)&mreqs, sizeof(mreqs)) < 0) {
+            if (include)
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
+            else
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
+            return ff_neterrno();
+        }
+    }
+#elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
+    int i;
+    if (addr->sa_family != AF_INET) {
+        av_log(NULL, AV_LOG_ERROR,
+               "Setting multicast sources only supported for IPv4\n");
+        return AVERROR(EINVAL);
+    }
+    for (i = 0; i < nb_sources; i++) {
+        struct ip_mreq_source mreqs;
+        struct addrinfo *sourceaddr = udp_resolve_host(sources[i], 0,
+                                                       SOCK_DGRAM, AF_UNSPEC,
+                                                       AI_NUMERICHOST);
+        if (!sourceaddr)
+            return AVERROR(ENOENT);
+        if (sourceaddr->ai_addr->sa_family != AF_INET) {
+            freeaddrinfo(sourceaddr);
+            av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
+                   sources[i]);
+            return AVERROR(EINVAL);
+        }
+
+        mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
+        mreqs.imr_interface.s_addr = INADDR_ANY;
+        mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
+        freeaddrinfo(sourceaddr);
+
+        if (setsockopt(sockfd, IPPROTO_IP,
+                       include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
+                       (const void *)&mreqs, sizeof(mreqs)) < 0) {
+            if (include)
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
+            else
+                log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
+            return ff_neterrno();
+        }
+    }
+#else
+    return AVERROR(ENOSYS);
+#endif
+    return 0;
+}
+static int udp_set_url(struct sockaddr_storage *addr,
+                       const char *hostname, int port)
+{
     struct addrinfo *res0;
-    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
-    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
-    if (res0 == 0) return AVERROR_IO;
-    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
-    s->dest_addr_len = res0->ai_addrlen;
+    int addr_len;
+
+    res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
+    if (res0 == 0) return AVERROR(EIO);
+    memcpy(addr, res0->ai_addr, res0->ai_addrlen);
+    addr_len = res0->ai_addrlen;
     freeaddrinfo(res0);
-    return 0;
+
+    return addr_len;
 }
 
-static int udp_ipv6_set_local(URLContext *h) {
-    UDPContext *s = h->priv_data;
+static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
+                             socklen_t *addr_len, const char *localaddr)
+{
     int udp_fd = -1;
-    struct sockaddr_storage clientaddr;
-    socklen_t addrlen;
-    char sbuf[NI_MAXSERV];
-    char hbuf[NI_MAXHOST];
     struct addrinfo *res0 = NULL, *res = NULL;
+    int family = AF_UNSPEC;
 
-    if (s->local_port != 0) {
-        res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
-        if (res0 == 0)
-            goto fail;
-        for (res = res0; res; res=res->ai_next) {
-            udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
-            if (udp_fd > 0) break;
-            perror("socket");
-        }
-    } else {
-        udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
-        if (udp_fd < 0)
-            perror("socket");
-    }
-
-    if (udp_fd < 0)
+    if (((struct sockaddr *) &s->dest_addr)->sa_family)
+        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
+    res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
+                            SOCK_DGRAM, family, AI_PASSIVE);
+    if (res0 == 0)
         goto fail;
-
-    if (s->local_port != 0) {
-        if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
-            perror("bind");
-            goto fail;
-        }
-        freeaddrinfo(res0);
-        res0 = NULL;
+    for (res = res0; res; res=res->ai_next) {
+        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
+        if (udp_fd != -1) break;
+        log_net_error(NULL, AV_LOG_ERROR, "socket");
     }
 
-    addrlen = sizeof(clientaddr);
-    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
-        perror("getsockname");
+    if (udp_fd < 0)
         goto fail;
-    }
 
-    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
-        perror("getnameinfo");
-        goto fail;
-    }
+    memcpy(addr, res->ai_addr, res->ai_addrlen);
+    *addr_len = res->ai_addrlen;
 
-    s->local_port = strtol(sbuf, NULL, 10);
+    freeaddrinfo(res0);
 
     return udp_fd;
 
@@ -212,7 +293,18 @@ static int udp_ipv6_set_local(URLContext *h) {
     return -1;
 }
 
-#endif
+static int udp_port(struct sockaddr_storage *addr, int addr_len)
+{
+    char sbuf[sizeof(int)*3+1];
+    int error;
+
+    if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
+        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
+        return -1;
+    }
+
+    return strtol(sbuf, NULL, 10);
+}
 
 
 /**
@@ -221,42 +313,55 @@ static int udp_ipv6_set_local(URLContext *h) {
  * the remote server address.
  *
  * url syntax: udp://host:port[?option=val...]
- * option: 'multicast=1' : enable multicast
- *         'ttl=n'       : set the ttl value (for multicast only)
+ * option: 'ttl=n'       : set the ttl value (for multicast only)
  *         'localport=n' : set the local port
  *         'pkt_size=n'  : set max packet size
  *         'reuse=1'     : enable reusing the socket
  *
- * @param s1 media file context
+ * @param h media file context
  * @param uri of the remote server
  * @return zero if no error.
  */
-int udp_set_remote_url(URLContext *h, const char *uri)
+int ff_udp_set_remote_url(URLContext *h, const char *uri)
 {
-#ifdef CONFIG_IPV6
-    return udp_ipv6_set_remote_url(h, uri);
-#else
     UDPContext *s = h->priv_data;
-    char hostname[256];
+    char hostname[256], buf[10];
     int port;
+    const char *p;
 
-    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+    av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 
     /* set the destination address */
-    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
-        return AVERROR_IO;
-    s->dest_addr.sin_family = AF_INET;
-    s->dest_addr.sin_port = htons(port);
+    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
+    if (s->dest_addr_len < 0) {
+        return AVERROR(EIO);
+    }
+    s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
+    p = strchr(uri, '?');
+    if (p) {
+        if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
+            int was_connected = s->is_connected;
+            s->is_connected = strtol(buf, NULL, 10);
+            if (s->is_connected && !was_connected) {
+                if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
+                            s->dest_addr_len)) {
+                    s->is_connected = 0;
+                    log_net_error(h, AV_LOG_ERROR, "connect");
+                    return AVERROR(EIO);
+                }
+            }
+        }
+    }
+
     return 0;
-#endif
 }
 
 /**
- * Return the local port used by the UDP connexion
- * @param s1 media file context
+ * Return the local port used by the UDP connection
+ * @param h media file context
  * @return the local port number
  */
-int udp_get_local_port(URLContext *h)
+int ff_udp_get_local_port(URLContext *h)
 {
     UDPContext *s = h->priv_data;
     return s->local_port;
@@ -267,7 +372,7 @@ int udp_get_local_port(URLContext *h)
  * streams at the same time.
  * @param h media file context
  */
-int udp_get_file_handle(URLContext *h)
+static int udp_get_file_handle(URLContext *h)
 {
     UDPContext *s = h->priv_data;
     return s->udp_fd;
@@ -277,216 +382,237 @@ int udp_get_file_handle(URLContext *h)
 /* return non zero if error */
 static int udp_open(URLContext *h, const char *uri, int flags)
 {
-    char hostname[1024];
-    int port, udp_fd = -1, tmp;
-    UDPContext *s = NULL;
+    char hostname[1024], localaddr[1024] = "";
+    int port, udp_fd = -1, tmp, bind_ret = -1;
+    UDPContext *s = h->priv_data;
     int is_output;
     const char *p;
     char buf[256];
-#ifndef CONFIG_IPV6
-    struct sockaddr_in my_addr, my_addr1;
-    int len;
-#endif
+    struct sockaddr_storage my_addr;
+    socklen_t len;
+    int reuse_specified = 0;
+    int i, include = 0, num_sources = 0;
+    char *sources[32];
 
     h->is_streamed = 1;
     h->max_packet_size = 1472;
 
-    is_output = (flags & URL_WRONLY);
-
-    s = av_malloc(sizeof(UDPContext));
-    if (!s)
-        return AVERROR(ENOMEM);
+    is_output = !(flags & AVIO_FLAG_READ);
 
-    h->priv_data = s;
     s->ttl = 16;
-    s->is_multicast = 0;
-    s->local_port = 0;
-    s->reuse_socket = 0;
+    s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
+
     p = strchr(uri, '?');
     if (p) {
-        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
-        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
-        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
+        if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
+            char *endptr = NULL;
+            s->reuse_socket = strtol(buf, &endptr, 10);
+            /* assume if no digits were found it is a request to enable it */
+            if (buf == endptr)
+                s->reuse_socket = 1;
+            reuse_specified = 1;
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
             s->ttl = strtol(buf, NULL, 10);
         }
-        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
+        if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
             s->local_port = strtol(buf, NULL, 10);
         }
-        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
+        if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
             h->max_packet_size = strtol(buf, NULL, 10);
         }
+        if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
+            s->buffer_size = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
+            s->is_connected = strtol(buf, NULL, 10);
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
+            av_strlcpy(localaddr, buf, sizeof(localaddr));
+        }
+        if (av_find_info_tag(buf, sizeof(buf), "sources", p))
+            include = 1;
+        if (include || av_find_info_tag(buf, sizeof(buf), "block", p)) {
+            char *source_start;
+
+            source_start = buf;
+            while (1) {
+                char *next = strchr(source_start, ',');
+                if (next)
+                    *next = '\0';
+                sources[num_sources] = av_strdup(source_start);
+                if (!sources[num_sources])
+                    goto fail;
+                source_start = next + 1;
+                num_sources++;
+                if (num_sources >= FF_ARRAY_ELEMS(sources) || !next)
+                    break;
+            }
+        }
     }
 
     /* fill the dest addr */
-    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
+    av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
 
-    /* XXX: fix url_split */
+    /* XXX: fix av_url_split */
     if (hostname[0] == '\0' || hostname[0] == '?') {
         /* only accepts null hostname if input */
-        if (s->is_multicast || (flags & URL_WRONLY))
+        if (!(flags & AVIO_FLAG_READ))
             goto fail;
     } else {
-        udp_set_remote_url(h, uri);
+        if (ff_udp_set_remote_url(h, uri) < 0)
+            goto fail;
     }
 
-#ifndef CONFIG_IPV6
-    udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
+        s->local_port = port;
+    udp_fd = udp_socket_create(s, &my_addr, &len, localaddr);
     if (udp_fd < 0)
         goto fail;
 
-    my_addr.sin_family = AF_INET;
-    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
-    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
-        /* special case: the bind must be done on the multicast address port */
-        my_addr.sin_port = s->dest_addr.sin_port;
-    } else {
-        my_addr.sin_port = htons(s->local_port);
-    }
-
-    if (s->reuse_socket)
+    /* Follow the requested reuse option, unless it's multicast in which
+     * case enable reuse unless explicitly disabled.
+     */
+    if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
+        s->reuse_socket = 1;
         if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
             goto fail;
+    }
 
+    /* If multicast, try binding the multicast address first, to avoid
+     * receiving UDP packets from other sources aimed at the same UDP
+     * port. This fails on windows. This makes sending to the same address
+     * using sendto() fail, so only do it if we're opened in read-only mode. */
+    if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
+        bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
+    }
+    /* bind to the local address if not multicast or if the multicast
+     * bind failed */
     /* the bind is needed to give a port to the socket now */
-    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
+    if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
+        log_net_error(h, AV_LOG_ERROR, "bind failed");
         goto fail;
+    }
 
-    len = sizeof(my_addr1);
-    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
-    s->local_port = ntohs(my_addr1.sin_port);
+    len = sizeof(my_addr);
+    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
+    s->local_port = udp_port(&my_addr, len);
 
-#ifdef IP_MULTICAST_TTL
     if (s->is_multicast) {
-        if (h->flags & URL_WRONLY) {
+        if (h->flags & AVIO_FLAG_WRITE) {
             /* output */
-            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
-                           &s->ttl, sizeof(s->ttl)) < 0) {
-                perror("IP_MULTICAST_TTL");
+            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
                 goto fail;
-            }
-        } else {
+        }
+        if (h->flags & AVIO_FLAG_READ) {
             /* input */
-            memset(&s->mreq, 0, sizeof(s->mreq));
-            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
-            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
-            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
-                           &s->mreq, sizeof(s->mreq)) < 0) {
-                perror("rtp: IP_ADD_MEMBERSHIP");
+            if (num_sources == 0 || !include) {
+                if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
+                    goto fail;
+
+                if (num_sources) {
+                    if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 0) < 0)
+                        goto fail;
+                }
+            } else if (include && num_sources) {
+                if (udp_set_multicast_sources(udp_fd, (struct sockaddr *)&s->dest_addr, s->dest_addr_len, sources, num_sources, 1) < 0)
+                    goto fail;
+            } else {
+                av_log(NULL, AV_LOG_ERROR, "invalid udp settings: inclusive multicast but no sources given\n");
                 goto fail;
             }
         }
     }
-#endif
-#else
-    if (s->is_multicast && !(h->flags & URL_WRONLY))
-        s->local_port = port;
-    udp_fd = udp_ipv6_set_local(h);
-    if (udp_fd < 0)
-        goto fail;
-    if (s->is_multicast) {
-        if (h->flags & URL_WRONLY) {
-            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
-                goto fail;
-        } else {
-            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
-                goto fail;
-        }
-    }
-#endif
 
     if (is_output) {
         /* limit the tx buf size to limit latency */
-        tmp = UDP_TX_BUF_SIZE;
+        tmp = s->buffer_size;
         if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
-            perror("setsockopt sndbuf");
+            log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
+            goto fail;
+        }
+    } else {
+        /* set udp recv buffer size to the largest possible udp packet size to
+         * avoid losing data on OSes that set this too low by default. */
+        tmp = s->buffer_size;
+        if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
+            log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
+        }
+        /* make the socket non-blocking */
+        ff_socket_nonblock(udp_fd, 1);
+    }
+    if (s->is_connected) {
+        if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
+            log_net_error(h, AV_LOG_ERROR, "connect");
             goto fail;
         }
     }
 
+    for (i = 0; i < num_sources; i++)
+        av_free(sources[i]);
+
     s->udp_fd = udp_fd;
     return 0;
  fail:
     if (udp_fd >= 0)
         closesocket(udp_fd);
-    av_free(s);
-    return AVERROR_IO;
+    for (i = 0; i < num_sources; i++)
+        av_free(sources[i]);
+    return AVERROR(EIO);
 }
 
 static int udp_read(URLContext *h, uint8_t *buf, int size)
 {
     UDPContext *s = h->priv_data;
-#ifndef CONFIG_IPV6
-    struct sockaddr_in from;
-#else
-    struct sockaddr_storage from;
-#endif
-    socklen_t from_len;
-    int len;
-
-    for(;;) {
-        from_len = sizeof(from);
-        len = recvfrom (s->udp_fd, buf, size, 0,
-                        (struct sockaddr *)&from, &from_len);
-        if (len < 0) {
-            if (errno != EAGAIN && errno != EINTR)
-                return AVERROR_IO;
-        } else {
-            break;
-        }
+    int ret;
+
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->udp_fd, 0);
+        if (ret < 0)
+            return ret;
     }
-    return len;
+    ret = recv(s->udp_fd, buf, size, 0);
+    return ret < 0 ? ff_neterrno() : ret;
 }
 
-static int udp_write(URLContext *h, uint8_t *buf, int size)
+static int udp_write(URLContext *h, const uint8_t *buf, int size)
 {
     UDPContext *s = h->priv_data;
     int ret;
 
-    for(;;) {
+    if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
+        ret = ff_network_wait_fd(s->udp_fd, 1);
+        if (ret < 0)
+            return ret;
+    }
+
+    if (!s->is_connected) {
         ret = sendto (s->udp_fd, buf, size, 0,
                       (struct sockaddr *) &s->dest_addr,
-#ifndef CONFIG_IPV6
-                      sizeof (s->dest_addr));
-#else
                       s->dest_addr_len);
-#endif
-        if (ret < 0) {
-            if (errno != EINTR && errno != EAGAIN)
-                return AVERROR_IO;
-        } else {
-            break;
-        }
-    }
-    return size;
+    } else
+        ret = send(s->udp_fd, buf, size, 0);
+
+    return ret < 0 ? ff_neterrno() : ret;
 }
 
 static int udp_close(URLContext *h)
 {
     UDPContext *s = h->priv_data;
 
-#ifndef CONFIG_IPV6
-#ifdef IP_DROP_MEMBERSHIP
-    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
-        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
-                       &s->mreq, sizeof(s->mreq)) < 0) {
-            perror("IP_DROP_MEMBERSHIP");
-        }
-    }
-#endif
-#else
-    if (s->is_multicast && !(h->flags & URL_WRONLY))
-        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
-#endif
+    if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
+        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
     closesocket(s->udp_fd);
-    av_free(s);
     return 0;
 }
 
-URLProtocol udp_protocol = {
-    "udp",
-    udp_open,
-    udp_read,
-    udp_write,
-    NULL, /* seek */
-    udp_close,
+URLProtocol ff_udp_protocol = {
+    .name                = "udp",
+    .url_open            = udp_open,
+    .url_read            = udp_read,
+    .url_write           = udp_write,
+    .url_close           = udp_close,
+    .url_get_file_handle = udp_get_file_handle,
+    .priv_data_size      = sizeof(UDPContext),
+    .flags               = URL_PROTOCOL_FLAG_NETWORK,
 };