/* subnet.c -- handle subnet lookups and lists Copyright (C) 2000 Guus Sliepen , 2000 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 1.1.2.11 2000/11/04 22:57:33 guus Exp $ */ #include "config.h" #include #include #include "conf.h" #include "net.h" #include "subnet.h" #include "system.h" #include #include /* lists type of subnet */ subnet_t *subnet_list[SUBNET_TYPES] = { NULL }; /* 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); } /* Linked list management */ void subnet_add(conn_list_t *cl, subnet_t *subnet) { subnet_t *p = NULL; subnet_t *q = NULL; cp subnet->owner = cl; /* Link it into the owners list of subnets (unsorted) */ subnet->next = cl->subnets; subnet->prev = NULL; if(subnet->next) subnet->next->prev = subnet; cl->subnets = subnet; /* And now add it to the global subnet list (sorted) */ /* Sort on size of subnet mask (IPv4 only at the moment!) Three cases: subnet_list[] = NULL -> just add this subnet insert before first -> add it in front of list rest: insert after another subnet */ cp if(subnet_list[subnet->type]) { p = q = subnet_list[subnet->type]; for(; p; p = p->global_next) { if(subnet->net.ipv4.mask >= p->net.ipv4.mask) break; q = p; } } cp if(p == subnet_list[subnet->type]) /* First two cases */ { /* Insert in front */ subnet->global_next = subnet_list[subnet->type]; subnet->global_prev = NULL; subnet_list[subnet->type] = subnet; } else /* Third case */ { /* Insert after q */ subnet->global_next = q->global_next; subnet->global_prev = q; q->global_next = subnet; } cp if(subnet->global_next) subnet->global_next->global_prev = subnet; cp } void subnet_del(subnet_t *subnet) { cp /* Remove it from owner's list */ if(subnet->prev) subnet->prev->next = subnet->next; else subnet->owner->subnets = subnet->next; if(subnet->next) subnet->next->prev = subnet->prev; /* Remove it from the global list */ if(subnet->global_prev) subnet->global_prev->global_next = subnet->global_next; else subnet_list[subnet->type] = subnet->global_next; if(subnet->global_next) subnet->global_next->global_prev = subnet->global_prev; free_subnet(subnet); cp } /* Ascii representation of subnets */ subnet_t *str2net(char *subnetstr) { int type; subnet_t *subnet; cp if(sscanf(subnetstr, "%d,", &type) != 1) return NULL; cp subnet = new_subnet(); cp switch(type) { case SUBNET_MAC: if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type, &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]) != 7) { free_subnet(subnet); return NULL; } break; case SUBNET_IPV4: if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3) { free_subnet(subnet); return NULL; } break; case SUBNET_IPV6: if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type, &subnet->net.ipv6.address.x[0], &subnet->net.ipv6.address.x[1], &subnet->net.ipv6.address.x[2], &subnet->net.ipv6.address.x[3], &subnet->net.ipv6.address.x[4], &subnet->net.ipv6.address.x[5], &subnet->net.ipv6.address.x[6], &subnet->net.ipv6.address.x[7], &subnet->net.ipv6.mask.x[0], &subnet->net.ipv6.mask.x[1], &subnet->net.ipv6.mask.x[2], &subnet->net.ipv6.mask.x[3], &subnet->net.ipv6.mask.x[4], &subnet->net.ipv6.mask.x[5], &subnet->net.ipv6.mask.x[6], &subnet->net.ipv6.mask.x[7]) != 17) { free_subnet(subnet); return NULL; } break; default: free_subnet(subnet); return NULL; } cp return subnet; } char *net2str(subnet_t *subnet) { char *netstr; cp switch(subnet->type) { case SUBNET_MAC: asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type, 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, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask); break; case SUBNET_IPV6: asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", subnet->type, subnet->net.ipv6.address.x[0], subnet->net.ipv6.address.x[1], subnet->net.ipv6.address.x[2], subnet->net.ipv6.address.x[3], subnet->net.ipv6.address.x[4], subnet->net.ipv6.address.x[5], subnet->net.ipv6.address.x[6], subnet->net.ipv6.address.x[7], subnet->net.ipv6.mask.x[0], subnet->net.ipv6.mask.x[1], subnet->net.ipv6.mask.x[2], subnet->net.ipv6.mask.x[3], subnet->net.ipv6.mask.x[4], subnet->net.ipv6.mask.x[5], subnet->net.ipv6.mask.x[6], subnet->net.ipv6.mask.x[7]); break; default: asprintf(&netstr, _("unknown")); } cp return netstr; } /* Subnet lookup routines */ subnet_t *lookup_subnet_mac(mac_t address) { subnet_t *subnet; cp for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next) { if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0) break; } cp return subnet; } subnet_t *lookup_subnet_ipv4(ipv4_t address) { subnet_t *subnet; cp for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next) { if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address) break; } cp return subnet; } subnet_t *lookup_subnet_ipv6(ipv6_t address) { subnet_t *subnet; int i; cp for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next) { for(i=0; i<8; i++) if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i]) break; if(i == 8) break; } cp return subnet; } void dump_subnet_list(void) { subnet_t *subnet; char *netstr; cp syslog(LOG_DEBUG, _("Subnet list:")); for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next) { netstr = net2str(subnet); syslog(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name); free(netstr); } syslog(LOG_DEBUG, _("End of subnet list.")); cp }