Reload configuration through control socket

I also kept the SIGHUP handler, which many people will expect to see.
The control socket is better, though - it will tell you if there is a
problem.

src/control.c

@@ -130,6 +130,12 @@ static void handle_control_data(struct bufferevent *event, void *data) {
 		goto respond;
 	}
 
+	if(req.type == REQ_RELOAD) {
+		logger(LOG_NOTICE, _("Got '%s' command"), "reload");
+		res.res_errno = reload_configuration();
+		goto respond;
+	}
+
 	logger(LOG_DEBUG, _("Malformed control command received"));
 	res.res_errno = EINVAL;
 

src/net.c

@@ -234,13 +234,16 @@ static void sigterm_handler(int signal, short events, void *data) {
 }
 
 static void sighup_handler(int signal, short events, void *data) {
+	logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+	reload_configuration();
+}
+
+int reload_configuration(void) {
 	connection_t *c;
 	splay_node_t *node, *next;
 	char *fname;
 	struct stat s;
 	static time_t last_config_check = 0;
-	
-	logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
 
 	/* Reread our own configuration file */
 
@@ -250,7 +253,7 @@ static void sighup_handler(int signal, short events, void *data) {
 	if(!read_server_config()) {
 		logger(LOG_ERR, _("Unable to reread configuration file, exitting."));
 		event_loopexit(NULL);
-		return;
+		return EINVAL;
 	}
 
 	/* Close connections to hosts that have a changed or deleted host config file */
@@ -278,6 +281,8 @@ static void sighup_handler(int signal, short events, void *data) {
 	/* Try to make outgoing connections */
 	
 	try_outgoing_connections();
+
+	return 0;
 }
 
 void retry(void) {

src/net.h

@@ -157,6 +157,7 @@ extern void handle_meta_connection_data(int, short, void *);
 extern void regenerate_key();
 extern void purge(void);
 extern void retry(void);
+extern int reload_configuration(void);
 
 #ifndef HAVE_MINGW
 #define closesocket(s) close(s)

src/tincctl.c

@@ -92,6 +92,7 @@ static void usage(bool status) {
 				"  purge                      Purge unreachable nodes\n"
 				"  debug N                    Set debug level\n"
 				"  retry                      Retry all outgoing connections\n"
+				"  reload                     Partial reload of configuration\n"
 				"\n"));
 		printf(_("Report bugs to tinc@tinc-vpn.org.\n"));
 	}
@@ -601,6 +602,10 @@ int main(int argc, char *argv[], char *envp[]) {
 		return send_ctl_request_cooked(fd, REQ_RETRY, NULL, 0) != -1;
 	}
 
+	if(!strcasecmp(argv[optind], "reload")) {
+		return send_ctl_request_cooked(fd, REQ_RELOAD, NULL, 0) != -1;
+	}
+
 	fprintf(stderr, _("Unknown command `%s'.\n"), argv[optind]);
 	usage(true);