398 lines
11 KiB
C
398 lines
11 KiB
C
/*
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* network range to IP+mask converter
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*
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* Copyright 2011-2012 Willy Tarreau <w@1wt.eu>
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*
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* This program reads lines starting by two IP addresses and outputs them with
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* the two IP addresses replaced by a netmask covering the range between these
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* IPs (inclusive). When multiple ranges are needed, as many lines are emitted.
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* The IP addresses may be delimited by spaces, tabs or commas. Quotes are
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* stripped, and lines beginning with a sharp character ('#') are ignored. The
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* IP addresses may be either in the dotted format or represented as a 32-bit
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* integer value in network byte order.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAXLINE 1024
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static inline void in6_bswap(struct in6_addr *a)
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{
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a->s6_addr32[0] = ntohl(a->s6_addr32[0]);
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a->s6_addr32[1] = ntohl(a->s6_addr32[1]);
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a->s6_addr32[2] = ntohl(a->s6_addr32[2]);
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a->s6_addr32[3] = ntohl(a->s6_addr32[3]);
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}
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/* returns a string version of an IPv6 address in host order */
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static const char *get_ipv6_addr(struct in6_addr *addr)
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{
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struct in6_addr a;
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static char out[INET6_ADDRSTRLEN + 1];
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memcpy(&a, addr, sizeof(struct in6_addr));
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in6_bswap(&a);
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return inet_ntop(AF_INET6, &a, out, INET6_ADDRSTRLEN + 1);
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}
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static const char *get_addr(struct in6_addr *addr)
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{
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static char out[50];
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snprintf(out, 50, "%08x:%08x:%08x:%08x",
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addr->s6_addr32[0],
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addr->s6_addr32[1],
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addr->s6_addr32[2],
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addr->s6_addr32[3]);
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return out;
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}
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/* a <= b */
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static inline int a_le_b(struct in6_addr *a, struct in6_addr *b)
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{
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if (a->s6_addr32[0] < b->s6_addr32[0]) return 1;
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if (a->s6_addr32[0] > b->s6_addr32[0]) return 0;
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if (a->s6_addr32[1] < b->s6_addr32[1]) return 1;
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if (a->s6_addr32[1] > b->s6_addr32[1]) return 0;
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if (a->s6_addr32[2] < b->s6_addr32[2]) return 1;
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if (a->s6_addr32[2] > b->s6_addr32[2]) return 0;
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if (a->s6_addr32[3] < b->s6_addr32[3]) return 1;
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if (a->s6_addr32[3] > b->s6_addr32[3]) return 0;
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return 1;
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}
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/* a == b */
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static inline int a_eq_b(struct in6_addr *a, struct in6_addr *b)
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{
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if (a->s6_addr32[0] != b->s6_addr32[0]) return 0;
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if (a->s6_addr32[1] != b->s6_addr32[1]) return 0;
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if (a->s6_addr32[2] != b->s6_addr32[2]) return 0;
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if (a->s6_addr32[3] != b->s6_addr32[3]) return 0;
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return 1;
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}
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/* a > b */
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static inline int a_gt_b(struct in6_addr *a, struct in6_addr *b)
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{
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if (a->s6_addr32[0] > b->s6_addr32[0]) return 1;
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if (a->s6_addr32[0] < b->s6_addr32[0]) return 0;
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if (a->s6_addr32[1] > b->s6_addr32[1]) return 1;
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if (a->s6_addr32[1] < b->s6_addr32[1]) return 0;
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if (a->s6_addr32[2] > b->s6_addr32[2]) return 1;
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if (a->s6_addr32[2] < b->s6_addr32[2]) return 0;
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if (a->s6_addr32[3] > b->s6_addr32[3]) return 1;
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if (a->s6_addr32[3] < b->s6_addr32[3]) return 0;
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return 0;
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}
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/* ( 1 << m ) - 1 -> r */
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static inline struct in6_addr *hmask(unsigned int b, struct in6_addr *r)
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{
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if (b < 32) {
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r->s6_addr32[3] = (1 << b) - 1;
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r->s6_addr32[2] = 0;
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 0;
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}
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else if (b < 64) {
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r->s6_addr32[3] = 0xffffffff;
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r->s6_addr32[2] = (1 << (b - 32)) - 1;
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 0;
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}
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else if (b < 96) {
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r->s6_addr32[3] = 0xffffffff;
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r->s6_addr32[2] = 0xffffffff;
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r->s6_addr32[1] = (1 << (b - 64)) - 1;
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r->s6_addr32[0] = 0;
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}
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else if (b < 128) {
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r->s6_addr32[3] = 0xffffffff;
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r->s6_addr32[2] = 0xffffffff;
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r->s6_addr32[1] = 0xffffffff;
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r->s6_addr32[0] = (1 << (b - 96)) - 1;
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}
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else {
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r->s6_addr32[3] = 0xffffffff;
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r->s6_addr32[2] = 0xffffffff;
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r->s6_addr32[1] = 0xffffffff;
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r->s6_addr32[0] = 0xffffffff;
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}
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return r;
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}
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/* 1 << b -> r */
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static inline struct in6_addr *one_ls_b(unsigned int b, struct in6_addr *r)
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{
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if (b < 32) {
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r->s6_addr32[3] = 1 << b;
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r->s6_addr32[2] = 0;
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 0;
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}
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else if (b < 64) {
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r->s6_addr32[3] = 0;
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r->s6_addr32[2] = 1 << (b - 32);
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 0;
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}
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else if (b < 96) {
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r->s6_addr32[3] = 0;
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r->s6_addr32[2] = 0;
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r->s6_addr32[1] = 1 << (b - 64);
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r->s6_addr32[0] = 0;
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}
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else if (b < 128) {
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r->s6_addr32[3] = 0;
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r->s6_addr32[2] = 0;
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 1 << (b - 96);
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}
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else {
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r->s6_addr32[3] = 0;
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r->s6_addr32[2] = 0;
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r->s6_addr32[1] = 0;
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r->s6_addr32[0] = 0;
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}
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return r;
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}
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/* a + b -> r */
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static inline struct in6_addr *a_plus_b(struct in6_addr *a, struct in6_addr *b, struct in6_addr *r)
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{
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unsigned long long int c = 0;
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int i;
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for (i=3; i>=0; i--) {
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c = (unsigned long long int)a->s6_addr32[i] +
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(unsigned long long int)b->s6_addr32[i] + c;
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r->s6_addr32[i] = c;
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c >>= 32;
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}
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return r;
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}
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/* a - b -> r */
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static inline struct in6_addr *a_minus_b(struct in6_addr *a, struct in6_addr *b, struct in6_addr *r)
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{
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signed long long int c = 0;
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signed long long int d;
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int i;
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/* Check sign. Return 0xff..ff (-1) if the result is less than 0. */
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if (a_gt_b(b, a)) {
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r->s6_addr32[3] = 0xffffffff;
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r->s6_addr32[2] = 0xffffffff;
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r->s6_addr32[1] = 0xffffffff;
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r->s6_addr32[0] = 0xffffffff;
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return r;
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}
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for (i=3; i>=0; i--) {
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d = (unsigned long long int)b->s6_addr32[i] + c;
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c = (unsigned long long int)a->s6_addr32[i];
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if (c < d)
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c += 0x100000000ULL;
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c -= d;
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r->s6_addr32[i] = c;
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c >>= 32;
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}
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return r;
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}
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/* a & b -> r */
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static inline struct in6_addr *a_and_b(struct in6_addr *a, struct in6_addr *b, struct in6_addr *r)
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{
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r->s6_addr32[0] = a->s6_addr32[0] & b->s6_addr32[0];
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r->s6_addr32[1] = a->s6_addr32[1] & b->s6_addr32[1];
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r->s6_addr32[2] = a->s6_addr32[2] & b->s6_addr32[2];
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r->s6_addr32[3] = a->s6_addr32[3] & b->s6_addr32[3];
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return r;
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}
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/* a != 0 */
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int is_set(struct in6_addr *a)
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{
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return a->s6_addr32[0] ||
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a->s6_addr32[1] ||
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a->s6_addr32[2] ||
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a->s6_addr32[3];
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}
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/* 1 */
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static struct in6_addr one = { .s6_addr32 = {0, 0, 0, 1} };
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/* print all networks present between address <low> and address <high> in
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* cidr format, followed by <eol>.
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*/
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static void convert_range(struct in6_addr *low, struct in6_addr *high, const char *eol, const char *pfx)
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{
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int bit;
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struct in6_addr r0;
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struct in6_addr r1;
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if (a_eq_b(low, high)) {
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/* single value */
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printf("%s%s%s%s\n", pfx?pfx:"", pfx?" ":"", get_ipv6_addr(low), eol);
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return;
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}
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else if (a_gt_b(low, high)) {
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struct in6_addr *swap = low;
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low = high;
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high = swap;
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}
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if (a_eq_b(low, a_plus_b(high, &one, &r0))) {
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/* full range */
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printf("%s%s::/0%s\n", pfx?pfx:"", pfx?" ":"", eol);
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return;
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}
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//printf("low=%08x high=%08x\n", low, high);
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bit = 0;
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while (bit < 128 && a_le_b(a_plus_b(low, hmask(bit, &r0), &r0), high)) {
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/* enlarge mask */
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if (is_set(a_and_b(low, one_ls_b(bit, &r0), &r0))) {
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/* can't aggregate anymore, dump and retry from the same bit */
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printf("%s%s%s/%d%s\n", pfx?pfx:"", pfx?" ":"", get_ipv6_addr(low), 128-bit, eol);
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a_plus_b(low, one_ls_b(bit, &r0), low);
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}
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else {
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/* try to enlarge the mask as much as possible first */
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bit++;
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//printf(" ++bit=%d\n", bit);
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}
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}
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//printf("stopped 1 at low=%08x, bit=%d\n", low, bit);
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bit = 127;
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while (bit >= 0 && is_set(a_plus_b(a_minus_b(high, low, &r0), &one, &r0))) {
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/* shrink mask */
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if (is_set(a_and_b(a_plus_b(a_minus_b(high, low, &r0), &one, &r0), one_ls_b(bit, &r1), &r1))) {
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/* large bit accepted, dump and go on from the same bit */
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//printf("max: %08x/%d\n", low, 32-bit);
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printf("%s%s%s/%d%s\n", pfx?pfx:"", pfx?" ":"", get_ipv6_addr(low), 128-bit, eol);
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a_plus_b(low, one_ls_b(bit, &r0), low);
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}
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else {
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bit--;
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//printf(" --bit=%d, low=%08x\n", bit, low);
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}
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}
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//printf("stopped at low=%08x\n", low);
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}
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static void usage(const char *argv0)
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{
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fprintf(stderr,
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"Usage: %s [<addr> ...] < iplist.csv\n"
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"\n"
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"This program reads lines starting by two IP addresses and outputs them with\n"
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"the two IP addresses replaced by a netmask covering the range between these\n"
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"IPs (inclusive). When multiple ranges are needed, as many lines are emitted.\n"
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"The IP addresses may be delimited by spaces, tabs or commas. Quotes are\n"
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"stripped, and lines beginning with a sharp character ('#') are ignored. The\n"
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"IP addresses may be either in the dotted format or represented as a 32-bit\n"
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"integer value in network byte order.\n"
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"\n"
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"For each optional <addr> specified, only the network it belongs to is returned,\n"
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"prefixed with the <addr> value.\n"
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"\n", argv0);
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}
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int main(int argc, char **argv)
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{
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char line[MAXLINE];
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int l, lnum;
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char *lb, *le, *hb, *he, *err;
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struct in6_addr sa, da, ta;
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if (argc > 1 && *argv[1] == '-') {
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usage(argv[0]);
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exit(1);
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}
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lnum = 0;
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while (fgets(line, sizeof(line), stdin) != NULL) {
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l = strlen(line);
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if (l && line[l - 1] == '\n')
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line[--l] = '\0';
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lnum++;
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/* look for the first field which must be the low address of a range,
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* in dotted IPv4 format or as an integer. spaces and commas are
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* considered as delimiters, quotes are removed.
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*/
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for (lb = line; *lb == ' ' || *lb == '\t' || *lb == ',' || *lb == '"'; lb++);
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if (!*lb || *lb == '#')
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continue;
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for (le = lb + 1; *le != ' ' && *le != '\t' && *le != ',' && *le != '"' && *le; le++);
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if (!*le)
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continue;
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/* we have the low address between lb(included) and le(excluded) */
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*(le++) = 0;
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for (hb = le; *hb == ' ' || *hb == '\t' || *hb == ',' || *hb == '"'; hb++);
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if (!*hb || *hb == '#')
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continue;
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for (he = hb + 1; *he != ' ' && *he != '\t' && *he != ',' && *he != '"' && *he; he++);
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if (!*he)
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continue;
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/* we have the high address between hb(included) and he(excluded) */
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*(he++) = 0;
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/* we want to remove a possible ending quote and a possible comma,
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* not more.
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*/
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while (*he == '"')
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*(he++) = ' ';
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while (*he == ',' || *he == ' ' || *he == '\t')
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*(he++) = ' ';
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/* if the trailing string is not empty, prefix it with a space */
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if (*(he-1) == ' ')
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he--;
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if (inet_pton(AF_INET6, lb, &sa) <= 0) {
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fprintf(stderr, "Failed to parse source address <%s> at line %d, skipping line\n", lb, lnum);
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continue;
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}
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if (inet_pton(AF_INET6, hb, &da) <= 0) {
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fprintf(stderr, "Failed to parse destination address <%s> at line %d, skipping line\n", hb, lnum);
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continue;
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}
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in6_bswap(&sa);
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in6_bswap(&da);
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if (argc > 1) {
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for (l = 1; l < argc; l++) {
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if (inet_pton(AF_INET6, argv[l], &da) <= 0)
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continue;
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in6_bswap(&ta);
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if ((a_le_b(&sa, &ta) && a_le_b(&ta, &da)) || (a_le_b(&da, &ta) && a_le_b(&ta, &sa)))
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convert_range(&sa, &da, he, argv[l]);
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}
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}
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else {
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convert_range(&sa, &da, he, NULL);
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}
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}
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return 0;
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}
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