From a2ba56ac2dcf2b8f42bff9c047eb8e1daa3dfda7 Mon Sep 17 00:00:00 2001
From: octo <octo>
Date: Mon, 30 Jan 2006 17:15:39 +0000
Subject: [PATCH] Added the `MulticastTTL' option so users can set a TTL
 different to `1'.

---
 src/configfile.c |  7 ++-----
 src/network.c    | 26 ++++++++++++++++++++++++++
 src/network.h    |  1 +
 3 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/src/configfile.c b/src/configfile.c
index c217724a..52978b39 100644
--- a/src/configfile.c
+++ b/src/configfile.c
@@ -69,15 +69,12 @@ typedef struct cf_mode_item
  */
 static cf_mode_item_t cf_mode_list[] =
 {
-	/*
-	{"Server",      NULL, MODE_CLIENT                           },
-	{"Port",        NULL, MODE_CLIENT | MODE_SERVER             },
-	*/
+	{"MulticastTTL",NULL, MODE_CLIENT                           },
 	{"PIDFile",     NULL, MODE_CLIENT | MODE_SERVER | MODE_LOCAL},
 	{"DataDir",     NULL, MODE_CLIENT | MODE_SERVER | MODE_LOCAL},
 	{"LogFile",     NULL, MODE_CLIENT | MODE_SERVER | MODE_LOCAL}
 };
-static int cf_mode_num = 3;
+static int cf_mode_num = 4;
 
 static int nesting_depth = 0;
 static char *current_module = NULL;
diff --git a/src/network.c b/src/network.c
index 3fe25fd4..cecf0bad 100644
--- a/src/network.c
+++ b/src/network.c
@@ -33,6 +33,7 @@
 
 #include "network.h"
 #include "common.h"
+#include "configfile.h"
 #include "utils_debug.h"
 
 /* 1500 - 40 - 8  =  Ethernet packet - IPv6 header - UDP header */
@@ -61,6 +62,16 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
 {
 	int loop = 1;
 
+	char *ttl_str;
+	int   ttl_int;
+
+	ttl_str = cf_get_option ("MulticastTTL", NULL);
+	ttl_int = 0;
+	if (ttl_str != NULL)
+		ttl_int = atoi (ttl_str);
+	if ((ttl_int < 1) || (ttl_int > 255))
+		ttl_int = NET_DEFAULT_MC_TTL;
+
 	DBG ("fd = %i; calling `bind'", se->fd);
 
 	if (bind (se->fd, ai->ai_addr, ai->ai_addrlen) == -1)
@@ -88,6 +99,14 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
 				return (-1);
 			}
 
+			/* IP_MULTICAST_TTL */
+			if (setsockopt (se->fd, IPPROTO_IP, IP_MULTICAST_TTL,
+						&ttl_int, sizeof (ttl_int)) == -1)
+			{
+				syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
+				return (-1);
+			}
+
 			if (setsockopt (se->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 						&mreq, sizeof (mreq)) == -1)
 			{
@@ -128,6 +147,13 @@ static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
 				return (-1);
 			}
 
+			if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
+						&ttl_int, sizeof (ttl_int)) == -1)
+			{
+				syslog (LOG_ERR, "setsockopt: %s", strerror (errno));
+				return (-1);
+			}
+
 			if (setsockopt (se->fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP,
 						&mreq, sizeof (mreq)) == -1)
 			{
diff --git a/src/network.h b/src/network.h
index 374448cc..aa3d3fcd 100644
--- a/src/network.h
+++ b/src/network.h
@@ -54,6 +54,7 @@
 #define NET_DEFAULT_V4_ADDR "239.192.74.66"
 #define NET_DEFAULT_V6_ADDR "ff18::efc0:4a42"
 #define NET_DEFAULT_PORT    "25826"
+#define NET_DEFAULT_MC_TTL  1
 
 int network_create_socket (const char *node, const char *service);
 int network_receive (char **host, char **type, char **instance, char **value);
-- 
2.30.2