/* subnet.c -- handle subnet lookups and lists 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 the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 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: subnet.c,v 1.1.2.33 2002/03/12 14:20:44 guus Exp $ */ #include "config.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" /* 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 return (subnet_t *)xmalloc(sizeof(subnet_t)); } void free_subnet(subnet_t *subnet) { cp free(subnet); } /* Adding and removing subnets */ void subnet_add(node_t *n, subnet_t *subnet) { cp subnet->owner = n; avl_insert(subnet_tree, subnet); cp avl_insert(n->subnet_tree, subnet); cp } void subnet_del(node_t *n, subnet_t *subnet) { cp avl_delete(n->subnet_tree, subnet); cp avl_delete(subnet_tree, subnet); cp } /* 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) { subnet_t subnet, *p; cp subnet.type = SUBNET_MAC; memcpy(&subnet.net.mac.address, address, sizeof(mac_t)); p = (subnet_t *)avl_search(subnet_tree, &subnet); cp return p; } subnet_t *lookup_subnet_ipv4(ipv4_t *address) { subnet_t subnet, *p; cp 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); cp return p; } subnet_t *lookup_subnet_ipv6(ipv6_t *address) { subnet_t subnet, *p; cp 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); 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 }