X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=net.c;h=92ae217d6b4bf7cdc438ff018774f9c0d9bdbc03;hp=d9b3a9defa8164e98be1dda341df3a62b1e4bf9b;hb=1a05bcbf311d82afc8c39314be3ae035fe65c911;hpb=a5927501e41fa3fca2975452617474e78ffecc48

diff --git a/net.c b/net.c
index d9b3a9de..92ae217d 100644
--- a/net.c
+++ b/net.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
@@ -279,7 +279,7 @@ struct flowopts *flowopt_new(void)
  * Append new socket option to flowopt queue.
  *
  * \param fo   The flowopt queue to append to.
- * \param lev  Level at which \opt resides.
+ * \param lev  Level at which \a opt resides.
  * \param opt  New option to add.
  * \param name Stringified name of \a opt.
  * \param val  The value to set \a opt to.
@@ -351,7 +351,6 @@ static void flowopt_cleanup(struct flowopts *fo)
 /**
  * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
  *
- * \param l3type The layer-3 type (\p AF_INET, \p AF_INET6, \p AF_UNSPEC).
  * \param l4type The layer-4 type (\p IPPROTO_xxx).
  * \param passive Whether this is a passive (1) or active (0) socket.
  * \param host Remote or local hostname or IPv/6 address string.
@@ -384,7 +383,7 @@ int makesock(unsigned l4type, bool passive,
 	struct addrinfo *local = NULL, *src,
 			*remote = NULL, *dst, hints;
 	unsigned int	l3type = AF_UNSPEC;
-	int		rc, sockfd = -1,
+	int		rc, on = 1, sockfd = -1,
 			socktype = sock_type(l4type);
 	char port[6]; /* port number has at most 5 digits */
 
@@ -429,6 +428,19 @@ int makesock(unsigned l4type, bool passive,
 		if (sockfd < 0)
 			goto get_next_dst;
 
+		/*
+		 * Reuse the address on passive sockets to avoid failure on
+		 * restart (protocols using listen()) and when creating
+		 * multiple listener instances (UDP multicast).
+		 */
+		if (passive && setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
+						  &on, sizeof(on)) == -1) {
+			rc = errno;
+			close(sockfd);
+			PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
+				       strerror(rc));
+			return -ERRNO_TO_PARA_ERROR(rc);
+		}
 		flowopt_setopts(sockfd, fo);
 
 		if (src) {
@@ -457,10 +469,11 @@ get_next_src:
 	flowopt_cleanup(fo);
 
 	if (src == NULL && dst == NULL) {
+		rc = errno;
 		PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
 			layer4_name(l4type), host? host : (passive?
 			"[loopback]" : "[localhost]"), port);
-		return -ERRNO_TO_PARA_ERROR(errno);
+		return -ERRNO_TO_PARA_ERROR(rc);
 	}
 	return sockfd;
 }
@@ -479,20 +492,14 @@ get_next_src:
  */
 int para_listen(unsigned l4type, uint16_t port, struct flowopts *fo)
 {
-	int fd, ret;
-
-	if (fo == NULL)
-		fo = flowopt_new();
-
-	/* Reuse the address to avoid failure on restart. */
-	OPT_ENABLE(fo, SOL_SOCKET, SO_REUSEADDR);
+	int ret, fd = makesock(l4type, 1, NULL, port, fo);
 
-	fd = makesock(l4type, 1, NULL, port, fo);
 	if (fd > 0) {
 		ret = listen(fd, BACKLOG);
 		if (ret < 0) {
+			ret = errno;
 			close(fd);
-			return -ERRNO_TO_PARA_ERROR(errno);
+			return -ERRNO_TO_PARA_ERROR(ret);
 		}
 		PARA_INFO_LOG("listening on %s port %u, fd %d\n",
 			layer4_name(l4type), port, fd);
@@ -769,30 +776,35 @@ int para_accept(int fd, void *addr, socklen_t size)
 }
 
 /**
- * Probe the list of DCCP CCIDs supported locally by the host.
- * \param ccids Array to be filled in.
- * \param nccids Length of \a ccids.
- * \return Pointer to \a ccids, NULL on failure.
+ * Probe the list of DCCP CCIDs configured on this host.
+ * \param ccid_array Pointer to return statically allocated array in.
+ * \return Number of elements returned in \a ccid_array or error.
  *
  * NB: This feature is only available on Linux > 2.6.30; on older kernels
  * ENOPROTOOPT ("Protocol not available") will be returned.
  */
-const uint8_t *dccp_available_ccids(uint8_t *ccids, uint8_t *nccids)
+int dccp_available_ccids(uint8_t **ccid_array)
 {
-	int fd = makesock(IPPROTO_DCCP, 1, NULL, 0, NULL);
+	static uint8_t ccids[DCCP_MAX_HOST_CCIDS];
+	socklen_t nccids = sizeof(ccids);
+	int ret, fd;
 
-	if (fd < 0)
-		return NULL;
+	ret = fd = makesock(IPPROTO_DCCP, 1, NULL, 0, NULL);
+	if (ret < 0)
+		return ret;
 
 	if (getsockopt(fd, SOL_DCCP, DCCP_SOCKOPT_AVAILABLE_CCIDS,
-					ccids, (socklen_t *)nccids) < 0) {
+						ccids, &nccids) < 0) {
+		ret = errno;
+		close(fd);
 		PARA_ERROR_LOG("No DCCP_SOCKOPT_AVAILABLE_CCIDS: %s\n",
-				strerror(errno));
-		*nccids = 0;
+				strerror(ret));
+		return -ERRNO_TO_PARA_ERROR(ret);
 	}
-	close(fd);
 
-	return *nccids ? ccids : NULL;
+	close(fd);
+	*ccid_array = ccids;
+	return nccids;
 }
 
 /**