From a7cf22d3ec6bc1e6cc34878dbc211b726d143285 Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Tue, 2 May 2017 21:54:15 +0200
Subject: add configuration option for protocol (IPv4 vs. IPv6)

---
 pacredir.c    | 22 ++++++++++++++++++++--
 pacredir.conf |  5 +++++
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/pacredir.c b/pacredir.c
index 9fc08fd..6453bcf 100644
--- a/pacredir.c
+++ b/pacredir.c
@@ -609,6 +609,7 @@ int main(int argc, char ** argv) {
 	dictionary * ini;
 	const char * inistring;
 	char * values, * value;
+	int8_t use_proto = AVAHI_PROTO_UNSPEC;
 	uint16_t port;
 	struct ignore_interfaces * tmp_ignore_interfaces;
 	AvahiClient *client = NULL;
@@ -670,6 +671,7 @@ int main(int argc, char ** argv) {
 		/* continue anyway, there is nothing essential in the config file */
 	} else {
 		int ini_verbose;
+		const char * tmp;
 
 		/* extra verbosity from config */
 		ini_verbose = iniparser_getint(ini, "general:verbose", 0);
@@ -699,6 +701,22 @@ int main(int argc, char ** argv) {
 			free(values);
 		}
 
+		/* configure protocols to use */
+		if ((tmp = iniparser_getstring(ini, "general:protocol", NULL)) != NULL) {
+			switch(tmp[strlen(tmp) - 1]) {
+				case '4':
+					if (verbose > 0)
+						write_log(stdout, "Using IPv4 only\n");
+					use_proto = AVAHI_PROTO_INET;
+					break;
+				case '6':
+					if (verbose > 0)
+						write_log(stdout, "Using IPv6 only\n");
+					use_proto = AVAHI_PROTO_INET6;
+					break;
+			}
+		}
+
 		/* add static pacserve hosts */
 		if ((inistring = iniparser_getstring(ini, "general:pacserve hosts", NULL)) != NULL) {
 			values = strdup(inistring);
@@ -755,14 +773,14 @@ int main(int argc, char ** argv) {
 
 	/* create the service browser for PACSERVE */
 	if ((pacserve = avahi_service_browser_new(client, AVAHI_IF_UNSPEC,
-			 AVAHI_PROTO_UNSPEC, PACSERVE, NULL, 0, browse_callback, client)) == NULL) {
+			 use_proto, PACSERVE, NULL, 0, browse_callback, client)) == NULL) {
 		write_log(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_client_errno(client)));
 		goto fail;
 	}
 
 	/* create the service browser for PACDBSERVE */
 	if ((pacdbserve = avahi_service_browser_new(client, AVAHI_IF_UNSPEC,
-			AVAHI_PROTO_UNSPEC, PACDBSERVE, NULL, 0, browse_callback, client)) == NULL) {
+			use_proto, PACDBSERVE, NULL, 0, browse_callback, client)) == NULL) {
 		write_log(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_client_errno(client)));
 		goto fail;
 	}
diff --git a/pacredir.conf b/pacredir.conf
index c9a03cd..1f14bf3 100644
--- a/pacredir.conf
+++ b/pacredir.conf
@@ -19,6 +19,11 @@ max threads = 0
 #ignore interfaces = openvpn
 #ignore interfaces = tap0 tun0 openvpn
 
+# Specify to use IPv4, IPv6 or both.
+protocol = IPv4
+#protocol = IPv6
+#protocol = both
+
 # You may want to add hosts that do not announce their services via avahi or
 # are connected to a different network segment. Add them here.
 # Please note that pacdbserve hosts depend on the servers architecture!
-- 
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