X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;ds=sidebyside;f=src%2Fmeshlink.c;h=cbbb64d3728abe7ca3121237ebfe50800c9bbfb9;hb=48c87b045ff3143f369c96208b7b318352d309f8;hp=51590200078252a96b4afcf3e14ccd6ab5e67299;hpb=af427dfac6b084eeb59330ecc9491a0e30c4b36d;p=meshlink

diff --git a/src/meshlink.c b/src/meshlink.c
index 51590200..cbbb64d3 100644
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -1,6 +1,6 @@
 /*
     meshlink.c -- Implementation of the MeshLink API.
-    Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+    Copyright (C) 2014, 2017 Guus Sliepen <guus@meshlink.io>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -701,16 +701,74 @@ static bool ecdsa_keygen(meshlink_handle_t *mesh) {
 
 static struct timeval idle(event_loop_t *loop, void *data) {
 	meshlink_handle_t *mesh = data;
-	int t, tmin = -1;
+	struct timeval t, tmin = {3600, 0};
 	for splay_each(node_t, n, mesh->nodes) {
 		if(!n->utcp)
 			continue;
 		t = utcp_timeout(n->utcp);
-		if(t >= 0 && t < tmin)
+		if(timercmp(&t, &tmin, <))
 			tmin = t;
 	}
-	struct timeval tv = {.tv_sec = t};
-	return tv;
+	return tmin;
+}
+
+// Find out what local address a socket would use if we connect to the given address.
+// We do this using connect() on a UDP socket, so the kernel has to resolve the address
+// of both endpoints, but this will actually not send any UDP packet.
+static bool getlocaladdrname(char *destaddr, char *host, socklen_t hostlen) {
+	struct addrinfo *rai = NULL;
+	const struct addrinfo hint = {
+		.ai_family = AF_UNSPEC,
+		.ai_socktype = SOCK_DGRAM,
+		.ai_protocol = IPPROTO_UDP,
+	};
+
+	if(getaddrinfo(destaddr, "80", &hint, &rai) || !rai)
+		return false;
+
+	int sock = socket(rai->ai_family, rai->ai_socktype, rai->ai_protocol);
+	if(sock == -1) {
+		freeaddrinfo(rai);
+		return false;
+	}
+
+	if(connect(sock, rai->ai_addr, rai->ai_addrlen) && !sockwouldblock(errno)) {
+		freeaddrinfo(rai);
+		return false;
+	}
+
+	freeaddrinfo(rai);
+
+	struct sockaddr_storage sn;
+	socklen_t sl = sizeof sn;
+
+	if(getsockname(sock, (struct sockaddr *)&sn, &sl))
+		return false;
+
+	if(getnameinfo((struct sockaddr *)&sn, sl, host, hostlen, NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV))
+		return false;
+
+	return true;
+}
+
+// Get our local address(es) by simulating connecting to an Internet host.
+static void add_local_addresses(meshlink_handle_t *mesh) {
+	char host[NI_MAXHOST];
+	char entry[MAX_STRING_SIZE];
+
+	// IPv4 example.org
+
+	if(getlocaladdrname("93.184.216.34", host, sizeof host)) {
+		snprintf(entry, sizeof entry, "%s %s", host, mesh->myport);
+		append_config_file(mesh, mesh->name, "Address", entry);
+	}
+
+	// IPv6 example.org
+
+	if(getlocaladdrname("2606:2800:220:1:248:1893:25c8:1946", host, sizeof host)) {
+		snprintf(entry, sizeof entry, "%s %s", host, mesh->myport);
+		append_config_file(mesh, mesh->name, "Address", entry);
+	}
 }
 
 static bool meshlink_setup(meshlink_handle_t *mesh) {
@@ -854,6 +912,8 @@ meshlink_handle_t *meshlink_open(const char *confbase, const char *name, const c
 		return NULL;
 	}
 
+	add_local_addresses(mesh);
+
 	idle_set(&mesh->loop, idle, mesh);
 
 	logger(NULL, MESHLINK_DEBUG, "meshlink_open returning\n");
@@ -1835,6 +1895,10 @@ void meshlink_set_default_blacklist(meshlink_handle_t *mesh, bool blacklist) {
 void meshlink_hint_address(meshlink_handle_t *mesh, meshlink_node_t *node, const struct sockaddr *addr) {
 	if(!mesh || !node || !addr)
 		return;
+
+	// Ignore hints about ourself.
+	if((node_t *)node == mesh->self)
+		return;
 	
 	pthread_mutex_lock(&(mesh->mesh_mutex));