X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fsubnet.c;h=954d5d0a1e0747b59252b8c9331e35c3a817c83f;hp=9c225f2129bfbd0df31d571d6712d48830ecb3f1;hb=626d5956d2bb0660ba315fba77da6cec9776fd3b;hpb=2228b16159a7aff64e6559ee1635716154e67fe6 diff --git a/src/subnet.c b/src/subnet.c index 9c225f21..954d5d0a 100644 --- a/src/subnet.c +++ b/src/subnet.c @@ -1,7 +1,7 @@ /* subnet.c -- handle subnet lookups and lists - Copyright (C) 2000 Guus Sliepen , - 2000 Ivo Timmermans + Copyright (C) 2000-2002 Guus Sliepen , + 2000-2002 Ivo Timmermans This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,70 +17,409 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: subnet.c,v 1.1.2.1 2000/10/01 03:21:49 guus Exp $ + $Id: subnet.c,v 1.1.2.31 2002/02/20 17:16:15 guus Exp $ */ #include "config.h" -#include "subnet.h" + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "conf.h" #include "net.h" +#include "node.h" +#include "subnet.h" +#include "netutl.h" + +#include "system.h" + +int cache_mac_valid = 0; +int cache_ipv4_valid = 0; +int cache_ipv6_valid = 0; + +/* lists type of subnet */ + +avl_tree_t *subnet_tree; + +/* Subnet comparison */ + +int subnet_compare_mac(subnet_t *a, subnet_t *b) +{ +cp + return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t)); +} + +int subnet_compare_ipv4(subnet_t *a, subnet_t *b) +{ + int result; +cp + result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t)); + + if(result) + return result; + + return a->net.ipv4.masklength - b->net.ipv4.masklength; +} + +int subnet_compare_ipv6(subnet_t *a, subnet_t *b) +{ + int result; +cp + result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t)); + + if(result) + return result; + + return a->net.ipv6.masklength - b->net.ipv6.masklength; +} + +int subnet_compare(subnet_t *a, subnet_t *b) +{ + int result; +cp + 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: + syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, exitting!"), a->type); + cp_trace(); + exit(0); + } + + return 0; +} + +/* Initialising trees */ + +void init_subnets(void) +{ +cp + subnet_tree = avl_alloc_tree((avl_compare_t)subnet_compare, (avl_action_t)free_subnet); +cp +} + +void exit_subnets(void) +{ +cp + avl_delete_tree(subnet_tree); +cp +} + +avl_tree_t *new_subnet_tree(void) +{ +cp + return avl_alloc_tree((avl_compare_t)subnet_compare, NULL); +cp +} + +void free_subnet_tree(avl_tree_t *subnet_tree) +{ +cp + avl_delete_tree(subnet_tree); +cp +} /* Allocating and freeing space for subnets */ subnet_t *new_subnet(void) { cp -cp + return (subnet_t *)xmalloc(sizeof(subnet_t)); } void free_subnet(subnet_t *subnet) { cp -cp + free(subnet); } -/* Linked list management */ +/* Adding and removing subnets */ -int subnet_add(conn_list_t *cl, subnet_t *subnet) +void cache_invalidate(void) { + cache_mac_valid = 0; + cache_ipv4_valid = 0; + cache_ipv6_valid = 0; +} + +void subnet_add(node_t *n, subnet_t *subnet) +{ +cp + subnet->owner = n; + + cache_invalidate(); + + avl_insert(subnet_tree, subnet); cp - subnet->next = cl->subnets->next; - subnet->prev = NULL; - subnet->next->prev = subnet - cl->subnets = subnet; + avl_insert(n->subnet_tree, subnet); cp - return 0; } -int subnet_del(conn_list_t *cl, subnet_t *subnet) +void subnet_del(node_t *n, subnet_t *subnet) { cp - if(subnet->prev) - { - subnet->prev->next = subnet->next; - } - else - { - subnet->owner->subnets = subnet->next; - } - - subnet->next->prev = subnet->prev; - free_subnet(subnet); + cache_invalidate(); + + avl_delete(n->subnet_tree, subnet); +cp + avl_delete(subnet_tree, subnet); cp - return 0; } /* Ascii representation of subnets */ subnet_t *str2net(char *subnetstr) { + int i, l; + subnet_t *subnet; + unsigned short int x[8]; cp + subnet = new_subnet(); cp + if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d", + &x[0], &x[1], &x[2], &x[3], + &l) == 5) + { + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.masklength = l; + for(i = 0; i < 4; i++) + subnet->net.ipv4.address.x[i] = x[i]; + return subnet; + } + + 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], + &l) == 9) + { + subnet->type = SUBNET_IPV6; + subnet->net.ipv6.masklength = l; + for(i = 0; i < 8; i++) + subnet->net.ipv6.address.x[i] = htons(x[i]); + return subnet; + } + + if(sscanf(subnetstr, "%hu.%hu.%hu.%hu", + &x[0], &x[1], &x[2], &x[3]) == 4) + { + subnet->type = SUBNET_IPV4; + subnet->net.ipv4.masklength = 32; + for(i = 0; i < 4; i++) + subnet->net.ipv4.address.x[i] = x[i]; + return subnet; + } + + if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", + &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7]) == 8) + { + subnet->type = SUBNET_IPV6; + subnet->net.ipv6.masklength = 128; + for(i = 0; i < 8; i++) + subnet->net.ipv6.address.x[i] = htons(x[i]); + return subnet; + } + + if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx", + &x[0], &x[1], &x[2], &x[3], &x[4], &x[5]) == 6) + { + subnet->type = SUBNET_MAC; + for(i = 0; i < 6; i++) + subnet->net.mac.address.x[i] = x[i]; + return subnet; + } + + free(subnet); + return NULL; } char *net2str(subnet_t *subnet) { + char *netstr; cp + switch(subnet->type) + { + case SUBNET_MAC: + asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx", + 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]); + break; + case SUBNET_IPV4: + asprintf(&netstr, "%hu.%hu.%hu.%hu/%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.masklength); + break; + case SUBNET_IPV6: + asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%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.masklength); + break; + default: + syslog(LOG_ERR, _("net2str() was called with unknown subnet type %d, exitting!"), subnet->type); + cp_trace(); + exit(0); + } cp + return netstr; } /* Subnet lookup routines */ + +subnet_t *lookup_subnet(node_t *owner, subnet_t *subnet) +{ +cp + return avl_search(owner->subnet_tree, subnet); +} + +subnet_t *lookup_subnet_mac(mac_t *address) +{ + static subnet_t subnet, *p; +cp + if(cache_mac_valid && !memcmp(&subnet.net.mac.address, address, sizeof(mac_t))) + return p; + + subnet.type = SUBNET_MAC; + memcpy(&subnet.net.mac.address, address, sizeof(mac_t)); + + p = (subnet_t *)avl_search(subnet_tree, &subnet); + cache_mac_valid = 1; +cp + return p; +} + +subnet_t *lookup_subnet_ipv4(ipv4_t *address) +{ + static subnet_t subnet, *p; +cp + if(cache_ipv4_valid && !memcmp(&subnet.net.ipv4.address, address, sizeof(ipv4_t))) + return p; + + subnet.type = SUBNET_IPV4; + memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t)); + subnet.net.ipv4.masklength = 32; + + do + { + /* Go find subnet */ + + p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet); + + /* Check if the found subnet REALLY matches */ +cp + if(p) + { + if(p->type != SUBNET_IPV4) + { + p = NULL; + break; + } + + if (!maskcmp((char *)address, (char *)&p->net.ipv4.address, p->net.ipv4.masklength, sizeof(ipv4_t))) + break; + else + { + /* Otherwise, see if there is a bigger enclosing subnet */ + + subnet.net.ipv4.masklength = p->net.ipv4.masklength - 1; + maskcpy((char *)&subnet.net.ipv4.address, (char *)&p->net.ipv4.address, subnet.net.ipv4.masklength, sizeof(ipv4_t)); + } + } + } while (p); + + memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t)); + cache_ipv4_valid = 1; +cp + return p; +} + +subnet_t *lookup_subnet_ipv6(ipv6_t *address) +{ + static subnet_t subnet, *p; +cp + if(cache_ipv6_valid && !memcmp(&subnet.net.ipv6.address, address, sizeof(ipv6_t))) + return p; + + subnet.type = SUBNET_IPV6; + memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t)); + subnet.net.ipv6.masklength = 128; + + do + { + /* Go find subnet */ + + p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet); + + /* Check if the found subnet REALLY matches */ + +cp + if(p) + { + if(p->type != SUBNET_IPV6) + return NULL; + + if (!maskcmp((char *)address, (char *)&p->net.ipv6.address, p->net.ipv6.masklength, sizeof(ipv6_t))) + break; + else + { + /* Otherwise, see if there is a bigger enclosing subnet */ + + subnet.net.ipv6.masklength = p->net.ipv6.masklength - 1; + maskcpy((char *)&subnet.net.ipv6.address, (char *)&p->net.ipv6.address, subnet.net.ipv6.masklength, sizeof(ipv6_t)); + } + } + } while (p); + + memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t)); + cache_ipv6_valid = 1; +cp + return p; +} + +void dump_subnets(void) +{ + char *netstr; + subnet_t *subnet; + avl_node_t *node; +cp + syslog(LOG_DEBUG, _("Subnet list:")); + for(node = subnet_tree->head; node; node = node->next) + { + subnet = (subnet_t *)node->data; + netstr = net2str(subnet); + syslog(LOG_DEBUG, _(" %s owner %s"), netstr, subnet->owner->name); + free(netstr); + } + syslog(LOG_DEBUG, _("End of subnet list.")); +cp +}