X-Git-Url: https://git.librecmc.org/?p=oweals%2Ftinc.git;a=blobdiff_plain;f=src%2Fnet_setup.c;h=249724d31791c4bac6fbea13c8eb2e64399a736d;hp=5a7c6065ef830d68b5ca2694f50a9e4559e79108;hb=2a07dacae7443ac5a437a82c33d9e9d8d2acbfbd;hpb=fb5fcc575d25a51acf73d476f63ce72f30cda6c2

diff --git a/src/net_setup.c b/src/net_setup.c
index 5a7c606..249724d 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -295,17 +295,18 @@ char *get_name(void) {
 
 	if(*name == '$') {
 		char *envname = getenv(name + 1);
+		char hostname[32] = "";
 		if(!envname) {
 			if(strcmp(name + 1, "HOST")) {
 				fprintf(stderr, "Invalid Name: environment variable %s does not exist\n", name + 1);
 				return false;
 			}
-			char envname[32];
-			if(gethostname(envname, 32)) {
+			if(gethostname(hostname, sizeof hostname) || !*hostname) {
 				fprintf(stderr, "Could not get hostname: %s\n", strerror(errno));
 				return false;
 			}
-			envname[31] = 0;
+			hostname[31] = 0;
+			envname = hostname;
 		}
 		free(name);
 		name = xstrdup(envname);
@@ -334,11 +335,12 @@ static bool setup_myself(void) {
 	char *address = NULL;
 	char *proxy = NULL;
 	char *space;
-	char *envp[5];
+	char *envp[5] = {NULL};
 	struct addrinfo *ai, *aip, hint = {0};
 	bool choice;
 	int i, err;
 	int replaywin_int;
+	bool port_specified = false;
 
 	myself = new_node();
 	myself->connection = new_connection();
@@ -354,6 +356,8 @@ static bool setup_myself(void) {
 		return false;
 	}
 
+	/* Read tinc.conf and our own host config file */
+
 	myself->name = name;
 	myself->connection->name = xstrdup(name);
 	xasprintf(&fname, "%s/hosts/%s", confbase, name);
@@ -366,6 +370,10 @@ static bool setup_myself(void) {
 
 	if(!get_config_string(lookup_config(config_tree, "Port"), &myport))
 		myport = xstrdup("655");
+	else
+		port_specified = true;
+
+	/* Ensure myport is numeric */
 
 	if(!atoi(myport)) {
 		struct addrinfo *ai = str2addrinfo("localhost", myport, SOCK_DGRAM);
@@ -692,11 +700,10 @@ static bool setup_myself(void) {
 	xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 	xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 	xasprintf(&envp[3], "NAME=%s", myself->name);
-	envp[4] = NULL;
 
 	execute_script("tinc-up", envp);
 
-	for(i = 0; i < 5; i++)
+	for(i = 0; i < 4; i++)
 		free(envp[i]);
 
 	/* Run subnet-up scripts for our own subnets */
@@ -812,13 +819,27 @@ static bool setup_myself(void) {
 		} while(cfg);
 	}
 
-	if(listen_sockets)
-		logger(LOG_NOTICE, "Ready");
-	else {
+	if(!listen_sockets) {
 		logger(LOG_ERR, "Unable to create any listening socket!");
 		return false;
 	}
 
+	/* If no Port option was specified, set myport to the port used by the first listening socket. */
+
+	if(!port_specified) {
+		sockaddr_t sa;
+		socklen_t salen = sizeof sa;
+		if(!getsockname(listen_socket[0].udp, &sa.sa, &salen)) {
+			free(myport);
+			sockaddr2str(&sa, NULL, &myport);
+			if(!myport)
+				myport = xstrdup("655");
+		}
+	}
+
+	/* Done. */
+
+	logger(LOG_NOTICE, "Ready");
 	return true;
 }
 
@@ -862,7 +883,7 @@ bool setup_network(void) {
 void close_network_connections(void) {
 	avl_node_t *node, *next;
 	connection_t *c;
-	char *envp[5];
+	char *envp[5] = {NULL};
 	int i;
 
 	for(node = connection_tree->head; node; node = next) {
@@ -896,7 +917,6 @@ void close_network_connections(void) {
 	xasprintf(&envp[1], "DEVICE=%s", device ? : "");
 	xasprintf(&envp[2], "INTERFACE=%s", iface ? : "");
 	xasprintf(&envp[3], "NAME=%s", myself->name);
-	envp[4] = NULL;
 
 	exit_requests();
 	exit_edges();