Support :: in IPv6 Subnets.

[oweals/tinc.git] / src / subnet.c

diff --git a/src/subnet.c b/src/subnet.c
index 4d646a5d4ae09ce4518eecaacd32b6ec57fc827f..d7b9f470bffe3d68c2e3c2383504d008a716badd 100644 (file)
--- a/src/subnet.c
+++ b/src/subnet.c
@@ -1,6 +1,6 @@
 /*
     subnet.c -- handle subnet lookups and lists
-    Copyright (C) 2000-2009 Guus Sliepen <guus@tinc-vpn.org>,
+    Copyright (C) 2000-2010 Guus Sliepen <guus@tinc-vpn.org>,
                   2000-2005 Ivo Timmermans
 
     This program is free software; you can redistribute it and/or modify
@@ -52,7 +52,7 @@ static subnet_t *cache_mac_subnet[2];
 static bool cache_mac_valid[2];
 static int cache_mac_slot;
 
-void subnet_cache_flush() {
+void subnet_cache_flush(void) {
        cache_ipv4_valid[0] = cache_ipv4_valid[1] = false;
        cache_ipv6_valid[0] = cache_ipv6_valid[1] = false;
        cache_mac_valid[0] = cache_mac_valid[1] = false;
@@ -268,12 +268,84 @@ bool str2net(subnet_t *subnet, const char *subnetstr) {
                return true;
        }
 
+       // IPv6 short form
+       if(strstr(subnetstr, "::")) {
+               const char *p;
+               char *q;
+               int colons = 0;
+
+               // Count number of colons
+               for(p = subnetstr; *p; p++)
+                       if(*p == ':')
+                               colons++;
+
+               if(colons > 7)
+                       return false;
+
+               // Scan numbers before the double colon
+               p = subnetstr;
+               for(i = 0; i < colons; i++) {
+                       if(*p == ':')
+                               break;
+                       x[i] = strtoul(p, &q, 0x10);
+                       if(!q || p == q || *q != ':')
+                               return false;
+                       p = ++q;
+               }
+
+               p++;
+               colons -= i;
+               if(!i) {
+                       p++;
+                       colons--;
+               }
+
+               if(!*p || *p == '/' || *p == '#')
+                       colons--;
+
+               // Fill in the blanks
+               for(; i < 8 - colons; i++)
+                       x[i] = 0;
+
+               // Scan the remaining numbers
+               for(; i < 8; i++) {
+                       x[i] = strtoul(p, &q, 0x10);
+                       if(!q || p == q)
+                               return false;
+                       if(i == 7) {
+                               p = q;
+                               break;
+                       }
+                       if(*q != ':')
+                               return false;
+                       p = ++q;
+               }
+
+               l = 128;
+               if(*p == '/')
+                       sscanf(p, "/%d#%d", &l, &weight);
+               else if(*p == '#')
+                       sscanf(p, "#%d", &weight);
+
+               if(l < 0 || l > 128)
+                       return false;
+
+               subnet->type = SUBNET_IPV6;
+               subnet->net.ipv6.prefixlength = l;
+               subnet->weight = weight;
+
+               for(i = 0; i < 8; i++)
+                       subnet->net.ipv6.address.x[i] = htons(x[i]);
+
+               return true;
+       }
+
        return false;
 }
 
 bool net2str(char *netstr, int len, const subnet_t *subnet) {
        if(!netstr || !subnet) {
-               logger(LOG_ERR, "net2str() was called with netstr=%p, subnet=%p!\n", netstr, subnet);
+               logger(LOG_ERR, "net2str() was called with netstr=%p, subnet=%p!", netstr, subnet);
                return false;
        }
 
@@ -330,7 +402,7 @@ subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
 }
 
 subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
-       subnet_t *p, *r = NULL, subnet = {0};
+       subnet_t *p, *r = NULL;
        avl_node_t *n;
        int i;
 
@@ -347,10 +419,6 @@ subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
 
        // Search all subnets for a matching one
 
-       subnet.type = SUBNET_MAC;
-       subnet.net.mac.address = *address;
-       subnet.owner = NULL;
-
        for(n = owner ? owner->subnet_tree->head : subnet_tree->head; n; n = n->next) {
                p = n->data;
                
@@ -375,7 +443,7 @@ subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
 }
 
 subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
-       subnet_t *p, *r = NULL, subnet = {0};
+       subnet_t *p, *r = NULL;
        avl_node_t *n;
        int i;
 
@@ -390,15 +458,10 @@ subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
 
        // Search all subnets for a matching one
 
-       subnet.type = SUBNET_IPV4;
-       subnet.net.ipv4.address = *address;
-       subnet.net.ipv4.prefixlength = 32;
-       subnet.owner = NULL;
-
        for(n = subnet_tree->head; n; n = n->next) {
                p = n->data;
                
-               if(!p || p->type != subnet.type)
+               if(!p || p->type != SUBNET_IPV4)
                        continue;
 
                if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
@@ -419,7 +482,7 @@ subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
 }
 
 subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
-       subnet_t *p, *r = NULL, subnet = {0};
+       subnet_t *p, *r = NULL;
        avl_node_t *n;
        int i;
 
@@ -434,15 +497,10 @@ subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
 
        // Search all subnets for a matching one
 
-       subnet.type = SUBNET_IPV6;
-       subnet.net.ipv6.address = *address;
-       subnet.net.ipv6.prefixlength = 128;
-       subnet.owner = NULL;
-
        for(n = subnet_tree->head; n; n = n->next) {
                p = n->data;
                
-               if(!p || p->type != subnet.type)
+               if(!p || p->type != SUBNET_IPV6)
                        continue;
 
                if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
@@ -465,7 +523,7 @@ subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
 void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
        avl_node_t *node;
        int i;
-       char *envp[9] = {0};
+       char *envp[9] = {NULL};
        char netstr[MAXNETSTR];
        char *name, *address, *port;
        char empty[] = "";
@@ -482,6 +540,8 @@ void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
                // 4 and 5 are reserved for SUBNET and WEIGHT
                xasprintf(&envp[6], "REMOTEADDRESS=%s", address);
                xasprintf(&envp[7], "REMOTEPORT=%s", port);
+               free(port);
+               free(address);
        }
 
        name = up ? "subnet-up" : "subnet-down";
@@ -492,7 +552,7 @@ void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
                        if(!net2str(netstr, sizeof netstr, subnet))
                                continue;
                        // Strip the weight from the subnet, and put it in its own environment variable
-                       char *weight = strchr(netstr + 7, '#');
+                       char *weight = strchr(netstr, '#');
                        if(weight)
                                *weight++ = 0;
                        else
@@ -509,9 +569,9 @@ void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
                        execute_script(name, envp);
                }
        } else {
-               if(net2str(netstr + 7, sizeof netstr - 7, subnet)) {
+               if(net2str(netstr, sizeof netstr, subnet)) {
                        // Strip the weight from the subnet, and put it in its own environment variable
-                       char *weight = strchr(netstr + 7, '#');
+                       char *weight = strchr(netstr, '#');
                        if(weight)
                                *weight++ = 0;
                        else