From c46f56a8b8bb865dd8951441b5acf4701b5b5b09 Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@tinc-vpn.org>
Date: Wed, 1 Dec 2004 20:06:05 +0000
Subject: [PATCH] subnet-up/down hooks

---
 src/net_setup.c       |  8 +++++++-
 src/protocol_subnet.c |  6 ++++++
 src/subnet.c          | 48 +++++++++++++++++++++++++++++++++++++++++++
 src/subnet.h          |  1 +
 4 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/src/net_setup.c b/src/net_setup.c
index 0c9f27c3..3751537e 100644
--- a/src/net_setup.c
+++ b/src/net_setup.c
@@ -462,6 +462,10 @@ bool setup_myself(void)
 	for(i = 0; i < 5; i++)
 		free(envp[i]);
 
+	/* Run subnet-up scripts for our own subnets */
+
+	subnet_update(myself, NULL, true);
+
 	/* Open sockets */
 
 	get_config_string(lookup_config(config_tree, "BindToAddress"), &address);
@@ -568,8 +572,10 @@ void close_network_connections(void)
 		terminate_connection(c, false);
 	}
 
-	if(myself && myself->connection)
+	if(myself && myself->connection) {
+		subnet_update(myself, NULL, false);
 		terminate_connection(myself->connection, false);
+	}
 
 	for(i = 0; i < listen_sockets; i++) {
 		close(listen_socket[i].tcp);
diff --git a/src/protocol_subnet.c b/src/protocol_subnet.c
index 4a761b7b..efe375a6 100644
--- a/src/protocol_subnet.c
+++ b/src/protocol_subnet.c
@@ -134,6 +134,9 @@ bool add_subnet_h(connection_t *c)
 	*(new = new_subnet()) = s;
 	subnet_add(owner, new);
 
+	if(owner->status.reachable)
+		subnet_update(owner, new, true);
+
 	/* Tell the rest */
 
 	if(!tunnelserver)
@@ -229,6 +232,9 @@ bool del_subnet_h(connection_t *c)
 
 	/* Finally, delete it. */
 
+	if(owner->status.reachable)
+		subnet_update(owner, find, false);
+
 	subnet_del(owner, find);
 
 	return true;
diff --git a/src/subnet.c b/src/subnet.c
index aca1912b..984cc7f8 100644
--- a/src/subnet.c
+++ b/src/subnet.c
@@ -23,10 +23,12 @@
 #include "system.h"
 
 #include "avl_tree.h"
+#include "device.h"
 #include "logger.h"
 #include "net.h"
 #include "netutl.h"
 #include "node.h"
+#include "process.h"
 #include "subnet.h"
 #include "utils.h"
 #include "xalloc.h"
@@ -385,6 +387,52 @@ subnet_t *lookup_subnet_ipv6(const ipv6_t *address)
 	return p;
 }
 
+void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
+	avl_node_t *node;
+	int i;
+	char *envp[8];
+	char netstr[MAXNETSTR + 7] = "SUBNET=";
+	char *name, *address, *port;
+
+	asprintf(&envp[0], "NETNAME=%s", netname ? : "");
+	asprintf(&envp[1], "DEVICE=%s", device ? : "");
+	asprintf(&envp[2], "INTERFACE=%s", iface ? : "");
+	asprintf(&envp[3], "NODE=%s", owner->name);
+	if(owner != myself) {
+		sockaddr2str(&owner->address, &address, &port);
+		asprintf(&envp[4], "REMOTEADDRESS=%s", address);
+		asprintf(&envp[5], "REMOTEPORT=%s", port);
+		envp[6] = netstr;
+		envp[7] = NULL;
+	} else {
+		envp[4] = netstr;
+		envp[5] = NULL;
+	}
+
+	name = up ? "subnet-up" : "subnet-down";
+
+	if(!subnet) {
+		for(node = owner->subnet_tree->head; node; node = node->next) {
+			subnet = node->data;
+			if(!net2str(netstr + 7, sizeof netstr - 7, subnet))
+				continue;
+			execute_script(name, envp);
+		}
+	} else {
+		if(net2str(netstr + 7, sizeof netstr - 7, subnet))
+			execute_script(name, envp);
+	}
+
+	net2str(netstr, sizeof netstr, subnet);
+	envp[6] = envp[7] = NULL;
+	
+	for(i = 0; i < (owner != myself ? 6 : 4); i++)
+		free(envp[i]);
+
+	free(address);
+	free(port);
+}
+
 void dump_subnets(void)
 {
 	char netstr[MAXNETSTR];
diff --git a/src/subnet.h b/src/subnet.h
index 2d40dc3a..824d582b 100644
--- a/src/subnet.h
+++ b/src/subnet.h
@@ -74,6 +74,7 @@ extern avl_tree_t *new_subnet_tree(void) __attribute__ ((__malloc__));
 extern void free_subnet_tree(avl_tree_t *);
 extern void subnet_add(struct node_t *, subnet_t *);
 extern void subnet_del(struct node_t *, subnet_t *);
+extern void subnet_update(struct node_t *, subnet_t *, bool);
 extern bool net2str(char *, int, const subnet_t *);
 extern bool str2net(subnet_t *, const char *);
 extern subnet_t *lookup_subnet(const struct node_t *, const subnet_t *);
-- 
2.39.5