From ab4d289fafd1d391583935ab4c306f1f508ea1d0 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Sat, 25 Jun 2011 21:35:27 +0200
Subject: [PATCH] Make pid files backwards compatible and add address of
 listening socket.

The pid is now written first, so that a version 1.0.x tincd can be used to stop
a running version 1.1 tincd.  Getsockname() is used to determine the address of
the first listening socket, so that tincctl can connect to the local tincd even
if AddressFamily = ipv6, or if BindToAddress or BindToInterface is used.
---
 src/control.c | 15 ++++++++++++++-
 src/tincctl.c | 11 +++--------
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/src/control.c b/src/control.c
index 01f25aab..bcafc09f 100644
--- a/src/control.c
+++ b/src/control.c
@@ -26,6 +26,7 @@
 #include "logger.h"
 #include "meta.h"
 #include "net.h"
+#include "netutl.h"
 #include "protocol.h"
 #include "route.h"
 #include "splay_tree.h"
@@ -146,8 +147,20 @@ bool init_control(void) {
 #else
 	chmod(pidfilename, 0600);
 #endif
+	// Get the address and port of the first listening socket
 
-	fprintf(f, "%s %s %d\n", controlcookie, myport, getpid());
+	char *localhost = NULL;
+	sockaddr_t sa;
+	socklen_t len = sizeof sa;
+
+	if(getsockname(listen_socket[0].tcp, (struct sockaddr *)&sa, &len))
+		xasprintf(&localhost, "127.0.0.1 port %d", myport);
+	else
+		localhost = sockaddr2hostname(&sa);
+
+	fprintf(f, "%d %s %s\n", (int)getpid(), controlcookie, localhost);
+
+	free(localhost);
 	fclose(f);
 
 	return true;
diff --git a/src/tincctl.c b/src/tincctl.c
index 7ed79b1a..98f4a1b9 100644
--- a/src/tincctl.c
+++ b/src/tincctl.c
@@ -44,7 +44,6 @@ static char *pidfilename = NULL;			/* pid file location */
 static char controlcookie[1024];
 char *netname = NULL;
 char *confbase = NULL;
-static char *host = NULL;
 
 #ifdef HAVE_MINGW
 static struct WSAData wsa_state;
@@ -52,7 +51,6 @@ static struct WSAData wsa_state;
 
 static struct option const long_options[] = {
 	{"config", required_argument, NULL, 'c'},
-	{"host", required_argument, NULL, 'h'},
 	{"net", required_argument, NULL, 'n'},
 	{"help", no_argument, NULL, 1},
 	{"version", no_argument, NULL, 2},
@@ -104,7 +102,7 @@ static bool parse_options(int argc, char **argv) {
 	int r;
 	int option_index = 0;
 
-	while((r = getopt_long(argc, argv, "c:n:h:", long_options, &option_index)) != EOF) {
+	while((r = getopt_long(argc, argv, "c:n:", long_options, &option_index)) != EOF) {
 		switch (r) {
 			case 0:				/* long option */
 				break;
@@ -113,10 +111,6 @@ static bool parse_options(int argc, char **argv) {
 				confbase = xstrdup(optarg);
 				break;
 
-			case 'h':				/* alternative host to connect to */
-				host = xstrdup(optarg);
-				break;
-
 			case 'n':				/* net name given */
 				netname = xstrdup(optarg);
 				break;
@@ -429,6 +423,7 @@ void pcap(int fd, FILE *out) {
 int main(int argc, char *argv[], char *envp[]) {
 	int fd;
 	int result;
+	char host[128];
 	char port[128];
 	int pid;
 
@@ -487,7 +482,7 @@ int main(int argc, char *argv[], char *envp[]) {
 		fprintf(stderr, "Could not open pid file %s: %s\n", pidfilename, strerror(errno));
 		return 1;
 	}
-	if(fscanf(f, "%1024s %128s %20d", controlcookie, port, &pid) != 3) {
+	if(fscanf(f, "%20d %1024s %128s port %128s", &pid, controlcookie, host, port) != 4) {
 		fprintf(stderr, "Could not parse pid file %s\n", pidfilename);
 		return 1;
 	}
-- 
2.20.1