X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_socket.c;h=afe349d9e22611dab6736cf74f1a66c9ad704a88;hb=73a45af5c50d58867efc7f1778d7c2f9906f50d9;hp=a69612790852b2d7379ae8d781360c6722a852c6;hpb=d6b45d005530496e48325a6174ecdd889a17bfc1;p=tinc

diff --git a/src/net_socket.c b/src/net_socket.c
index a6961279..afe349d9 100644
--- a/src/net_socket.c
+++ b/src/net_socket.c
@@ -289,10 +289,44 @@ int setup_vpn_in_socket(const sockaddr_t *sa) {
 		logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, sockstrerror(sockerrno));
 	}
 
+	{
+		// The system may cap the requested buffer size.
+		// Read back the value and check if it is now as requested.
+		int udp_rcvbuf_actual = -1;
+		socklen_t optlen = sizeof(udp_rcvbuf_actual);
+
+		if(getsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf_actual, &optlen)) {
+			logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP SO_RCVBUF: %s", sockstrerror(sockerrno));
+		} else if(optlen != sizeof(udp_rcvbuf_actual)) {
+			logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP SO_RCVBUF: Unexpected returned optlen %jd", (intmax_t) optlen);
+		} else {
+			if(udp_rcvbuf_actual != udp_rcvbuf) {
+				logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i, the system set it to %i instead", udp_rcvbuf, udp_rcvbuf_actual);
+			}
+		}
+	}
+
 	if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf))) {
 		logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, sockstrerror(sockerrno));
 	}
 
+	{
+		// The system may cap the requested buffer size.
+		// Read back the value and check if it is now as requested.
+		int udp_sndbuf_actual = -1;
+		socklen_t optlen = sizeof(udp_sndbuf_actual);
+
+		if(getsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf_actual, &optlen)) {
+			logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP SO_SNDBUF: %s", sockstrerror(sockerrno));
+		} else if(optlen != sizeof(udp_sndbuf_actual)) {
+			logger(DEBUG_ALWAYS, LOG_WARNING, "Can't read back UDP SO_SNDBUF: Unexpected returned optlen %jd", (intmax_t) optlen);
+		} else {
+			if(udp_sndbuf_actual != udp_sndbuf) {
+				logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i, the system set it to %i instead", udp_sndbuf, udp_sndbuf_actual);
+			}
+		}
+	}
+
 #if defined(IPV6_V6ONLY)
 
 	if(sa->sa.sa_family == AF_INET6) {
@@ -527,7 +561,7 @@ bool do_outgoing_connection(outgoing_t *outgoing) {
 	int result;
 
 begin:
-	sa = get_recent_address(outgoing->address_cache);
+	sa = get_recent_address(outgoing->node->address_cache);
 
 	if(!sa) {
 		logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->node->name);
@@ -632,6 +666,10 @@ void setup_outgoing_connection(outgoing_t *outgoing, bool verbose) {
 
 	node_t *n = outgoing->node;
 
+	if(!n->address_cache) {
+		n->address_cache = open_address_cache(n);
+	}
+
 	if(n->connection) {
 		logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", n->name);
 
@@ -643,10 +681,6 @@ void setup_outgoing_connection(outgoing_t *outgoing, bool verbose) {
 		}
 	}
 
-	if(!outgoing->address_cache) {
-		outgoing->address_cache = open_address_cache(n);
-	}
-
 	do_outgoing_connection(outgoing);
 	return;
 
@@ -787,11 +821,6 @@ void handle_new_unix_connection(void *data, int flags) {
 
 static void free_outgoing(outgoing_t *outgoing) {
 	timeout_del(&outgoing->ev);
-
-	if(outgoing->address_cache) {
-		close_address_cache(outgoing->address_cache);
-	}
-
 	free(outgoing);
 }