/*
subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2009 Guus Sliepen <guus@tinc-vpn.org>,
+ Copyright (C) 2000-2013 Guus Sliepen <guus@tinc-vpn.org>,
2000-2005 Ivo Timmermans
This program is free software; you can redistribute it and/or modify
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "splay_tree.h"
+#include "control_common.h"
#include "device.h"
+#include "hash.h"
#include "logger.h"
+#include "names.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
-#include "process.h"
+#include "script.h"
#include "subnet.h"
#include "utils.h"
#include "xalloc.h"
/* Subnet lookup cache */
-static ipv4_t cache_ipv4_address[2];
-static subnet_t *cache_ipv4_subnet[2];
-static bool cache_ipv4_valid[2];
-static int cache_ipv4_slot;
-
-static ipv6_t cache_ipv6_address[2];
-static subnet_t *cache_ipv6_subnet[2];
-static bool cache_ipv6_valid[2];
-static int cache_ipv6_slot;
-
-void subnet_cache_flush() {
- cache_ipv4_valid[0] = cache_ipv4_valid[1] = false;
- cache_ipv6_valid[0] = cache_ipv6_valid[1] = false;
-}
-
-/* Subnet comparison */
-
-static int subnet_compare_mac(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = memcmp(&a->net.mac.address, &b->net.mac.address, sizeof a->net.mac.address);
-
- if(result)
- return result;
-
- result = a->weight - b->weight;
-
- if(result || !a->owner || !b->owner)
- return result;
-
- return strcmp(a->owner->name, b->owner->name);
-}
-
-static int subnet_compare_ipv4(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = b->net.ipv4.prefixlength - a->net.ipv4.prefixlength;
-
- if(result)
- return result;
-
- result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t));
-
- if(result)
- return result;
-
- result = a->weight - b->weight;
-
- if(result || !a->owner || !b->owner)
- return result;
-
- return strcmp(a->owner->name, b->owner->name);
-}
-
-static int subnet_compare_ipv6(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = b->net.ipv6.prefixlength - a->net.ipv6.prefixlength;
-
- if(result)
- return result;
-
- result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
-
- if(result)
- return result;
-
- result = a->weight - b->weight;
-
- if(result || !a->owner || !b->owner)
- return result;
-
- return strcmp(a->owner->name, b->owner->name);
-}
-
-int subnet_compare(const subnet_t *a, const subnet_t *b)
-{
- int result;
-
- result = a->type - b->type;
-
- if(result)
- return result;
-
- switch (a->type) {
- case SUBNET_MAC:
- return subnet_compare_mac(a, b);
- case SUBNET_IPV4:
- return subnet_compare_ipv4(a, b);
- case SUBNET_IPV6:
- return subnet_compare_ipv6(a, b);
- default:
- logger(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, exitting!"),
- a->type);
- cp_trace();
- exit(0);
- }
+static hash_t *ipv4_cache;
+static hash_t *ipv6_cache;
+static hash_t *mac_cache;
- return 0;
+void subnet_cache_flush(void) {
+ hash_clear(ipv4_cache);
+ hash_clear(ipv6_cache);
+ hash_clear(mac_cache);
}
/* Initialising trees */
-void init_subnets(void)
-{
- cp();
-
+void init_subnets(void) {
subnet_tree = splay_alloc_tree((splay_compare_t) subnet_compare, (splay_action_t) free_subnet);
- subnet_cache_flush();
+ ipv4_cache = hash_alloc(0x100, sizeof(ipv4_t));
+ ipv6_cache = hash_alloc(0x100, sizeof(ipv6_t));
+ mac_cache = hash_alloc(0x100, sizeof(mac_t));
}
-void exit_subnets(void)
-{
- cp();
-
+void exit_subnets(void) {
splay_delete_tree(subnet_tree);
-}
-splay_tree_t *new_subnet_tree(void)
-{
- cp();
+ hash_free(ipv4_cache);
+ hash_free(ipv6_cache);
+ hash_free(mac_cache);
+}
+splay_tree_t *new_subnet_tree(void) {
return splay_alloc_tree((splay_compare_t) subnet_compare, NULL);
}
-void free_subnet_tree(splay_tree_t *subnet_tree)
-{
- cp();
-
+void free_subnet_tree(splay_tree_t *subnet_tree) {
splay_delete_tree(subnet_tree);
}
/* Allocating and freeing space for subnets */
-subnet_t *new_subnet(void)
-{
- cp();
-
- return xmalloc_and_zero(sizeof(subnet_t));
+subnet_t *new_subnet(void) {
+ return xzalloc(sizeof(subnet_t));
}
-void free_subnet(subnet_t *subnet)
-{
- cp();
-
+void free_subnet(subnet_t *subnet) {
free(subnet);
}
/* Adding and removing subnets */
-void subnet_add(node_t *n, subnet_t *subnet)
-{
- cp();
-
+void subnet_add(node_t *n, subnet_t *subnet) {
subnet->owner = n;
splay_insert(subnet_tree, subnet);
- splay_insert(n->subnet_tree, subnet);
+ if (n)
+ splay_insert(n->subnet_tree, subnet);
subnet_cache_flush();
}
-void subnet_del(node_t *n, subnet_t *subnet)
-{
- cp();
-
- splay_delete(n->subnet_tree, subnet);
+void subnet_del(node_t *n, subnet_t *subnet) {
+ if (n)
+ splay_delete(n->subnet_tree, subnet);
splay_delete(subnet_tree, subnet);
subnet_cache_flush();
}
-/* Ascii representation of subnets */
-
-bool str2net(subnet_t *subnet, const char *subnetstr)
-{
- int i, l;
- uint16_t x[8];
- int weight = 10;
-
- cp();
-
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d#%d",
- &x[0], &x[1], &x[2], &x[3], &l, &weight) >= 5) {
- if(l < 0 || l > 32)
- return false;
-
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = l;
- subnet->weight = weight;
-
- for(i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
- }
+/* Subnet lookup routines */
- return true;
- }
+subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet) {
+ return splay_search(owner->subnet_tree, subnet);
+}
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d#%d",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7],
- &l, &weight) >= 9) {
- if(l < 0 || l > 128)
- return false;
+subnet_t *lookup_subnet_mac(const node_t *owner, const mac_t *address) {
+ subnet_t *r = NULL;
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = l;
- subnet->weight = weight;
+ // Check if this address is cached
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
+ if((r = hash_search(mac_cache, address)))
+ return r;
- return true;
- }
+ // Search all subnets for a matching one
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu#%d", &x[0], &x[1], &x[2], &x[3], &weight) >= 4) {
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = 32;
- subnet->weight = weight;
+ for splay_each(subnet_t, p, owner ? owner->subnet_tree : subnet_tree) {
+ if(!p || p->type != SUBNET_MAC)
+ continue;
- for(i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
+ if(!memcmp(address, &p->net.mac.address, sizeof *address)) {
+ r = p;
+ if(!p->owner || p->owner->status.reachable)
+ break;
}
-
- return true;
}
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx#%d",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7], &weight) >= 8) {
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = 128;
- subnet->weight = weight;
-
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
-
- return true;
- }
-
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx#%d",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &weight) >= 6) {
- subnet->type = SUBNET_MAC;
- subnet->weight = weight;
-
- for(i = 0; i < 6; i++)
- subnet->net.mac.address.x[i] = x[i];
-
- return true;
- }
-
- return false;
-}
-
-bool net2str(char *netstr, int len, const subnet_t *subnet)
-{
- cp();
-
- if(!netstr || !subnet) {
- logger(LOG_ERR, _("net2str() was called with netstr=%p, subnet=%p!\n"), netstr, subnet);
- return false;
- }
-
- switch (subnet->type) {
- case SUBNET_MAC:
- snprintf(netstr, len, "%hx:%hx:%hx:%hx:%hx:%hx#%d",
- subnet->net.mac.address.x[0],
- subnet->net.mac.address.x[1],
- subnet->net.mac.address.x[2],
- subnet->net.mac.address.x[3],
- subnet->net.mac.address.x[4],
- subnet->net.mac.address.x[5],
- subnet->weight);
- break;
-
- case SUBNET_IPV4:
- snprintf(netstr, len, "%hu.%hu.%hu.%hu/%d#%d",
- subnet->net.ipv4.address.x[0],
- subnet->net.ipv4.address.x[1],
- subnet->net.ipv4.address.x[2],
- subnet->net.ipv4.address.x[3],
- subnet->net.ipv4.prefixlength,
- subnet->weight);
- break;
-
- case SUBNET_IPV6:
- snprintf(netstr, len, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d#%d",
- ntohs(subnet->net.ipv6.address.x[0]),
- ntohs(subnet->net.ipv6.address.x[1]),
- ntohs(subnet->net.ipv6.address.x[2]),
- ntohs(subnet->net.ipv6.address.x[3]),
- ntohs(subnet->net.ipv6.address.x[4]),
- ntohs(subnet->net.ipv6.address.x[5]),
- ntohs(subnet->net.ipv6.address.x[6]),
- ntohs(subnet->net.ipv6.address.x[7]),
- subnet->net.ipv6.prefixlength,
- subnet->weight);
- break;
-
- default:
- logger(LOG_ERR,
- _("net2str() was called with unknown subnet type %d, exiting!"),
- subnet->type);
- cp_trace();
- exit(0);
- }
-
- return true;
-}
-
-/* Subnet lookup routines */
-
-subnet_t *lookup_subnet(const node_t *owner, const subnet_t *subnet)
-{
- cp();
-
- return splay_search(owner->subnet_tree, subnet);
-}
-
-subnet_t *lookup_subnet_mac(const mac_t *address)
-{
- subnet_t *p, subnet = {0};
-
- cp();
-
- subnet.type = SUBNET_MAC;
- subnet.net.mac.address = *address;
- subnet.owner = NULL;
+ // Cache the result
- p = splay_search(subnet_tree, &subnet);
+ if(r)
+ hash_insert(mac_cache, address, r);
- return p;
+ return r;
}
-subnet_t *lookup_subnet_ipv4(const ipv4_t *address)
-{
- subnet_t *p, *r = NULL, subnet = {0};
- splay_node_t *n;
- int i;
-
- cp();
+subnet_t *lookup_subnet_ipv4(const ipv4_t *address) {
+ subnet_t *r = NULL;
// Check if this address is cached
- for(i = 0; i < 2; i++) {
- if(!cache_ipv4_valid[i])
- continue;
- if(!memcmp(address, &cache_ipv4_address[i], sizeof *address))
- return cache_ipv4_subnet[i];
- }
+ if((r = hash_search(ipv4_cache, address)))
+ return r;
// 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)
+ for splay_each(subnet_t, p, subnet_tree) {
+ if(!p || p->type != SUBNET_IPV4)
continue;
if(!maskcmp(address, &p->net.ipv4.address, p->net.ipv4.prefixlength)) {
r = p;
- if(p->owner->status.reachable)
+ if(!p->owner || p->owner->status.reachable)
break;
}
}
// Cache the result
- cache_ipv4_slot = !cache_ipv4_slot;
- memcpy(&cache_ipv4_address[cache_ipv4_slot], address, sizeof *address);
- cache_ipv4_subnet[cache_ipv4_slot] = r;
- cache_ipv4_valid[cache_ipv4_slot] = true;
+ if(r)
+ hash_insert(ipv4_cache, address, r);
return r;
}
-subnet_t *lookup_subnet_ipv6(const ipv6_t *address)
-{
- subnet_t *p, *r = NULL, subnet = {0};
- splay_node_t *n;
- int i;
-
- cp();
+subnet_t *lookup_subnet_ipv6(const ipv6_t *address) {
+ subnet_t *r = NULL;
// Check if this address is cached
- for(i = 0; i < 2; i++) {
- if(!cache_ipv6_valid[i])
- continue;
- if(!memcmp(address, &cache_ipv6_address[i], sizeof *address))
- return cache_ipv6_subnet[i];
- }
+ if((r = hash_search(ipv6_cache, address)))
+ return r;
// 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)
+ for splay_each(subnet_t, p, subnet_tree) {
+ if(!p || p->type != SUBNET_IPV6)
continue;
if(!maskcmp(address, &p->net.ipv6.address, p->net.ipv6.prefixlength)) {
r = p;
- if(p->owner->status.reachable)
+ if(!p->owner || p->owner->status.reachable)
break;
}
}
// Cache the result
- cache_ipv6_slot = !cache_ipv6_slot;
- memcpy(&cache_ipv6_address[cache_ipv6_slot], address, sizeof *address);
- cache_ipv6_subnet[cache_ipv6_slot] = r;
- cache_ipv6_valid[cache_ipv6_slot] = true;
+ if(r)
+ hash_insert(ipv6_cache, address, r);
return r;
}
void subnet_update(node_t *owner, subnet_t *subnet, bool up) {
- splay_node_t *node;
- int i;
- char *envp[8];
- char netstr[MAXNETSTR + 7] = "SUBNET=";
+ char netstr[MAXNETSTR];
char *name, *address, *port;
+ char empty[] = "";
- 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);
+ // Prepare environment variables to be passed to the script
+
+ char *envp[10] = {NULL};
+ int n = 0;
+ xasprintf(&envp[n++], "NETNAME=%s", netname ? : "");
+ xasprintf(&envp[n++], "DEVICE=%s", device ? : "");
+ xasprintf(&envp[n++], "INTERFACE=%s", iface ? : "");
+ xasprintf(&envp[n++], "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;
+ xasprintf(&envp[n++], "REMOTEADDRESS=%s", address);
+ xasprintf(&envp[n++], "REMOTEPORT=%s", port);
+ free(port);
+ free(address);
}
+ xasprintf(&envp[n++], "NAME=%s", myself->name);
+
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))
+ for splay_each(subnet_t, subnet, owner->subnet_tree) {
+ 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, '#');
+ if(weight)
+ *weight++ = 0;
+ else
+ weight = empty;
+
+ // Prepare the SUBNET and WEIGHT variables
+ free(envp[n]);
+ free(envp[n + 1]);
+ xasprintf(&envp[n], "SUBNET=%s", netstr);
+ xasprintf(&envp[n + 1], "WEIGHT=%s", weight);
+
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, '#');
+ if(weight)
+ *weight++ = 0;
+ else
+ weight = empty;
+
+ // Prepare the SUBNET and WEIGHT variables
+ xasprintf(&envp[n], "SUBNET=%s", netstr);
+ xasprintf(&envp[n + 1], "WEIGHT=%s", weight);
+
execute_script(name, envp);
+ }
}
- for(i = 0; i < (owner != myself ? 6 : 4); i++)
+ for(int i = 0; envp[i] && i < 9; i++)
free(envp[i]);
-
- if(owner != myself) {
- free(address);
- free(port);
- }
}
-int dump_subnets(struct evbuffer *out)
-{
- char netstr[MAXNETSTR];
- subnet_t *subnet;
- splay_node_t *node;
-
- cp();
+bool dump_subnets(connection_t *c) {
+ for splay_each(subnet_t, subnet, subnet_tree) {
+ char netstr[MAXNETSTR];
- for(node = subnet_tree->head; node; node = node->next) {
- subnet = node->data;
if(!net2str(netstr, sizeof netstr, subnet))
continue;
- if(evbuffer_add_printf(out, _(" %s owner %s\n"),
- netstr, subnet->owner->name) == -1)
- return errno;
+
+ send_request(c, "%d %d %s %s",
+ CONTROL, REQ_DUMP_SUBNETS,
+ netstr, subnet->owner ? subnet->owner->name : "(broadcast)");
}
- return 0;
+ return send_request(c, "%d %d", CONTROL, REQ_DUMP_SUBNETS);
}
projects / tinc / blobdiff