1199208Sattilio/*- 2199208Sattilio * Copyright (c) 2001 Charles Mott <cm@linktel.net> 3199208Sattilio * All rights reserved. 4199208Sattilio * 5199208Sattilio * Redistribution and use in source and binary forms, with or without 6199208Sattilio * modification, are permitted provided that the following conditions 7199208Sattilio * are met: 8199208Sattilio * 1. Redistributions of source code must retain the above copyright 9199208Sattilio * notice, this list of conditions and the following disclaimer. 10199208Sattilio * 2. Redistributions in binary form must reproduce the above copyright 11199208Sattilio * notice, this list of conditions and the following disclaimer in the 12199208Sattilio * documentation and/or other materials provided with the distribution. 13199208Sattilio * 14199208Sattilio * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15199208Sattilio * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16199208Sattilio * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17199208Sattilio * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18199208Sattilio * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19199208Sattilio * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20199208Sattilio * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21199208Sattilio * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22199208Sattilio * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23199208Sattilio * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24199208Sattilio * SUCH DAMAGE. 25199208Sattilio */ 26199208Sattilio 27199208Sattilio#include <sys/cdefs.h> 28199208Sattilio__FBSDID("$FreeBSD$"); 29199208Sattilio 30199208Sattilio#include <sys/param.h> 31199208Sattilio#include <sys/ctype.h> 32199208Sattilio#include <sys/limits.h> 33199208Sattilio#include <sys/systm.h> 34199208Sattilio 35199208Sattilio#include <netinet/in.h> 36199208Sattilio 37199208Sattilioint 38199208Sattilioinet_aton(const char *cp, struct in_addr *addr) 39199208Sattilio{ 40199208Sattilio u_long parts[4]; 41199208Sattilio in_addr_t val; 42199208Sattilio const char *c; 43199208Sattilio char *endptr; 44199208Sattilio int gotend, n; 45199208Sattilio 46199208Sattilio c = (const char *)cp; 47199208Sattilio n = 0; 48199208Sattilio 49199208Sattilio /* 50199208Sattilio * Run through the string, grabbing numbers until 51199208Sattilio * the end of the string, or some error 52199208Sattilio */ 53199208Sattilio gotend = 0; 54199208Sattilio while (!gotend) { 55199208Sattilio unsigned long l; 56199208Sattilio 57199208Sattilio l = strtoul(c, &endptr, 0); 58199208Sattilio 59199208Sattilio if (l == ULONG_MAX || (l == 0 && endptr == c)) 60199208Sattilio return (0); 61199208Sattilio 62199208Sattilio val = (in_addr_t)l; 63199208Sattilio 64199208Sattilio /* 65199208Sattilio * If the whole string is invalid, endptr will equal 66199208Sattilio * c.. this way we can make sure someone hasn't 67199208Sattilio * gone '.12' or something which would get past 68199208Sattilio * the next check. 69199208Sattilio */ 70199208Sattilio if (endptr == c) 71199208Sattilio return (0); 72199208Sattilio parts[n] = val; 73199208Sattilio c = endptr; 74199208Sattilio 75199208Sattilio /* Check the next character past the previous number's end */ 76199208Sattilio switch (*c) { 77199208Sattilio case '.' : 78199208Sattilio 79199208Sattilio /* Make sure we only do 3 dots .. */ 80199208Sattilio if (n == 3) /* Whoops. Quit. */ 81199208Sattilio return (0); 82199208Sattilio n++; 83199208Sattilio c++; 84199208Sattilio break; 85199208Sattilio 86199208Sattilio case '\0': 87199208Sattilio gotend = 1; 88199208Sattilio break; 89199208Sattilio 90199208Sattilio default: 91199208Sattilio if (isspace((unsigned char)*c)) { 92199208Sattilio gotend = 1; 93199208Sattilio break; 94199208Sattilio } else { 95199208Sattilio 96199208Sattilio /* Invalid character, then fail. */ 97199208Sattilio return (0); 98199208Sattilio } 99199208Sattilio } 100199208Sattilio 101199208Sattilio } 102199208Sattilio 103199208Sattilio /* Concoct the address according to the number of parts specified. */ 104199208Sattilio switch (n) { 105199208Sattilio case 0: /* a -- 32 bits */ 106199208Sattilio 107199208Sattilio /* 108199208Sattilio * Nothing is necessary here. Overflow checking was 109199208Sattilio * already done in strtoul(). 110199208Sattilio */ 111199208Sattilio break; 112199208Sattilio case 1: /* a.b -- 8.24 bits */ 113199208Sattilio if (val > 0xffffff || parts[0] > 0xff) 114199208Sattilio return (0); 115199208Sattilio val |= parts[0] << 24; 116199208Sattilio break; 117199208Sattilio 118199208Sattilio case 2: /* a.b.c -- 8.8.16 bits */ 119199208Sattilio if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff) 120199208Sattilio return (0); 121199208Sattilio val |= (parts[0] << 24) | (parts[1] << 16); 122199208Sattilio break; 123199208Sattilio 124199208Sattilio case 3: /* a.b.c.d -- 8.8.8.8 bits */ 125199208Sattilio if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff || 126199208Sattilio parts[2] > 0xff) 127199208Sattilio return (0); 128199208Sattilio val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); 129199208Sattilio break; 130199208Sattilio } 131199208Sattilio 132199208Sattilio if (addr != NULL) 133199208Sattilio addr->s_addr = htonl(val); 134199208Sattilio return (1); 135199208Sattilio} 136199208Sattilio 137