+++ /dev/null
-/*
- subnet_parse.c -- handle subnet parsing
- Copyright (C) 2000-2012 Guus Sliepen <guus@tinc-vpn.org>,
- 2000-2005 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.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-*/
-
-#include "system.h"
-
-#include "logger.h"
-#include "net.h"
-#include "netutl.h"
-#include "subnet.h"
-#include "utils.h"
-#include "xalloc.h"
-
-/* Subnet mask handling */
-
-int maskcmp(const void *va, const void *vb, int masklen) {
- int i, m, result;
- const char *a = va;
- const char *b = vb;
-
- for(m = masklen, i = 0; m >= 8; m -= 8, i++) {
- result = a[i] - b[i];
- if(result)
- return result;
- }
-
- if(m)
- return (a[i] & (0x100 - (1 << (8 - m)))) -
- (b[i] & (0x100 - (1 << (8 - m))));
-
- return 0;
-}
-
-void mask(void *va, int masklen, int len) {
- int i;
- char *a = va;
-
- i = masklen / 8;
- masklen %= 8;
-
- if(masklen)
- a[i++] &= (0x100 - (1 << (8 - masklen)));
-
- for(; i < len; i++)
- a[i] = 0;
-}
-
-void maskcpy(void *va, const void *vb, int masklen, int len) {
- int i, m;
- char *a = va;
- const char *b = vb;
-
- for(m = masklen, i = 0; m >= 8; m -= 8, i++)
- a[i] = b[i];
-
- if(m) {
- a[i] = b[i] & (0x100 - (1 << (8 - m)));
- i++;
- }
-
- for(; i < len; i++)
- a[i] = 0;
-}
-
-bool maskcheck(const void *va, int masklen, int len) {
- int i;
- const char *a = va;
-
- i = masklen / 8;
- masklen %= 8;
-
- if(masklen && a[i++] & (0xff >> masklen))
- return false;
-
- for(; i < len; i++)
- if(a[i] != 0)
- return false;
-
- return true;
-}
-
-/* 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(DEBUG_ALWAYS, LOG_ERR, "subnet_compare() was called with unknown subnet type %d, exitting!", a->type);
- exit(1);
- }
-
- return 0;
-}
-
-/* Ascii representation of subnets */
-
-bool str2net(subnet_t *subnet, const char *subnetstr) {
- int i, l;
- uint16_t x[8];
- int weight = 10;
-
- 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(int i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
- }
-
- return true;
- }
-
- 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->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;
- }
-
- 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(i = 0; i < 4; i++) {
- if(x[i] > 255)
- return false;
- subnet->net.ipv4.address.x[i] = x[i];
- }
-
- 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;
- }
-
- // 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(DEBUG_ALWAYS, LOG_ERR, "net2str() was called with netstr=%p, subnet=%p!", 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(DEBUG_ALWAYS, LOG_ERR, "net2str() was called with unknown subnet type %d, exiting!", subnet->type);
- exit(1);
- }
-
- return true;
-}
projects / meshlink / blobdiff