From: Guus Sliepen <guus@meshlink.io>
Date: Thu, 28 Jan 2021 21:26:00 +0000 (+0100)
Subject: Debugging for getifaddrs().
X-Git-Url: https://git.meshlink.io/?a=commitdiff_plain;h=refs%2Fheads%2Fdebug%2Fgetifaddrs;p=meshlink

Debugging for getifaddrs().

This logs which interfaces and addresses are returned by getifaddrs() that
are usable for MeshLink. It also adds the /scan command to the chat example
to force rescanning the network interfaces.
---

diff --git a/examples/chat.c b/examples/chat.c
index 88fe127a..2dc13be1 100644
--- a/examples/chat.c
+++ b/examples/chat.c
@@ -86,6 +86,8 @@ static void parse_command(meshlink_handle_t *mesh, char *buf) {
 			fprintf(stderr, "Could not restart MeshLink: %s\n", meshlink_strerror(meshlink_errno));
 			exit(1);
 		}
+	} else if(!strcasecmp(buf, "scan")) {
+		meshlink_hint_network_change(mesh);
 	} else if(!strcasecmp(buf, "kick")) {
 		if(!arg) {
 			fprintf(stderr, "/kick requires an argument!\n");
diff --git a/src/discovery.c b/src/discovery.c
index 18919745..8fc6895e 100644
--- a/src/discovery.c
+++ b/src/discovery.c
@@ -434,6 +434,7 @@ static void addr_del(meshlink_handle_t *mesh, const discovery_address_t *addr) {
 
 void scan_ifaddrs(meshlink_handle_t *mesh) {
 #ifdef HAVE_GETIFADDRS
+	logger(mesh, MESHLINK_WARNING, "Calling getifaddrs()");
 	struct ifaddrs *ifa = NULL;
 
 	if(getifaddrs(&ifa) == -1) {
@@ -525,6 +526,13 @@ void scan_ifaddrs(meshlink_handle_t *mesh) {
 			addr.address.sa.sa_family = AF_UNKNOWN;
 		}
 
+		if(addr.address.sa.sa_family != AF_UNKNOWN) {
+			char *host = NULL;
+			sockaddr2str(sa, &host, NULL);
+			logger(mesh, MESHLINK_WARNING, "iface %d (%s) address %s", index, ifap->ifa_name, host);
+			free(host);
+		}
+
 		if(addr.address.sa.sa_family != AF_UNKNOWN) {
 			addr_add(mesh, &addr);
 		}
@@ -532,7 +540,7 @@ void scan_ifaddrs(meshlink_handle_t *mesh) {
 
 	freeifaddrs(ifa);
 #else
-	(void)mesh;
+	logger(mesh, MESHLINK_ERROR, "getifaddrs() not supported");
 #endif
 }