inet_pton.c revision 177633
1177633Sdfr/* 2177633Sdfr * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3177633Sdfr * Copyright (c) 1996,1999 by Internet Software Consortium. 4177633Sdfr * 5177633Sdfr * Permission to use, copy, modify, and distribute this software for any 6177633Sdfr * purpose with or without fee is hereby granted, provided that the above 7177633Sdfr * copyright notice and this permission notice appear in all copies. 8177633Sdfr * 9177633Sdfr * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10177633Sdfr * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11177633Sdfr * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12177633Sdfr * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13177633Sdfr * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14177633Sdfr * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15177633Sdfr * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16177633Sdfr */ 17177633Sdfr 18177633Sdfr#if defined(LIBC_SCCS) && !defined(lint) 19177633Sdfrstatic const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $"; 20177633Sdfr#endif /* LIBC_SCCS and not lint */ 21177633Sdfr#include <sys/cdefs.h> 22177633Sdfr__FBSDID("$FreeBSD: head/sys/rpc/inet_pton.c 177633 2008-03-26 15:23:12Z dfr $"); 23177633Sdfr 24177633Sdfr#include <sys/param.h> 25177633Sdfr#include <sys/types.h> 26177633Sdfr#include <sys/socket.h> 27177633Sdfr#include <sys/systm.h> 28177633Sdfr 29177633Sdfr#include <rpc/types.h> 30177633Sdfr#include "rpc_com.h" 31177633Sdfr 32177633Sdfr/*% 33177633Sdfr * WARNING: Don't even consider trying to compile this on a system where 34177633Sdfr * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 35177633Sdfr */ 36177633Sdfr 37177633Sdfrstatic int inet_pton4(const char *src, u_char *dst); 38177633Sdfrstatic int inet_pton6(const char *src, u_char *dst); 39177633Sdfr 40177633Sdfr/* int 41177633Sdfr * inet_pton(af, src, dst) 42177633Sdfr * convert from presentation format (which usually means ASCII printable) 43177633Sdfr * to network format (which is usually some kind of binary format). 44177633Sdfr * return: 45177633Sdfr * 1 if the address was valid for the specified address family 46177633Sdfr * 0 if the address wasn't valid (`dst' is untouched in this case) 47177633Sdfr * -1 if some other error occurred (`dst' is untouched in this case, too) 48177633Sdfr * author: 49177633Sdfr * Paul Vixie, 1996. 50177633Sdfr */ 51177633Sdfrint 52177633Sdfr__rpc_inet_pton(int af, const char * __restrict src, void * __restrict dst) 53177633Sdfr{ 54177633Sdfr switch (af) { 55177633Sdfr case AF_INET: 56177633Sdfr return (inet_pton4(src, dst)); 57177633Sdfr case AF_INET6: 58177633Sdfr return (inet_pton6(src, dst)); 59177633Sdfr default: 60177633Sdfr return (-1); 61177633Sdfr } 62177633Sdfr /* NOTREACHED */ 63177633Sdfr} 64177633Sdfr 65177633Sdfr/* int 66177633Sdfr * inet_pton4(src, dst) 67177633Sdfr * like inet_aton() but without all the hexadecimal and shorthand. 68177633Sdfr * return: 69177633Sdfr * 1 if `src' is a valid dotted quad, else 0. 70177633Sdfr * notice: 71177633Sdfr * does not touch `dst' unless it's returning 1. 72177633Sdfr * author: 73177633Sdfr * Paul Vixie, 1996. 74177633Sdfr */ 75177633Sdfrstatic int 76177633Sdfrinet_pton4(const char *src, u_char *dst) 77177633Sdfr{ 78177633Sdfr static const char digits[] = "0123456789"; 79177633Sdfr int saw_digit, octets, ch; 80177633Sdfr#define NS_INADDRSZ 4 81177633Sdfr u_char tmp[NS_INADDRSZ], *tp; 82177633Sdfr 83177633Sdfr saw_digit = 0; 84177633Sdfr octets = 0; 85177633Sdfr *(tp = tmp) = 0; 86177633Sdfr while ((ch = *src++) != '\0') { 87177633Sdfr const char *pch; 88177633Sdfr 89177633Sdfr if ((pch = strchr(digits, ch)) != NULL) { 90177633Sdfr u_int new = *tp * 10 + (pch - digits); 91177633Sdfr 92177633Sdfr if (saw_digit && *tp == 0) 93177633Sdfr return (0); 94177633Sdfr if (new > 255) 95177633Sdfr return (0); 96177633Sdfr *tp = new; 97177633Sdfr if (!saw_digit) { 98177633Sdfr if (++octets > 4) 99177633Sdfr return (0); 100177633Sdfr saw_digit = 1; 101177633Sdfr } 102177633Sdfr } else if (ch == '.' && saw_digit) { 103177633Sdfr if (octets == 4) 104177633Sdfr return (0); 105177633Sdfr *++tp = 0; 106177633Sdfr saw_digit = 0; 107177633Sdfr } else 108177633Sdfr return (0); 109177633Sdfr } 110177633Sdfr if (octets < 4) 111177633Sdfr return (0); 112177633Sdfr memcpy(dst, tmp, NS_INADDRSZ); 113177633Sdfr return (1); 114177633Sdfr} 115177633Sdfr 116177633Sdfr/* int 117177633Sdfr * inet_pton6(src, dst) 118177633Sdfr * convert presentation level address to network order binary form. 119177633Sdfr * return: 120177633Sdfr * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 121177633Sdfr * notice: 122177633Sdfr * (1) does not touch `dst' unless it's returning 1. 123177633Sdfr * (2) :: in a full address is silently ignored. 124177633Sdfr * credit: 125177633Sdfr * inspired by Mark Andrews. 126177633Sdfr * author: 127177633Sdfr * Paul Vixie, 1996. 128177633Sdfr */ 129177633Sdfrstatic int 130177633Sdfrinet_pton6(const char *src, u_char *dst) 131177633Sdfr{ 132177633Sdfr static const char xdigits_l[] = "0123456789abcdef", 133177633Sdfr xdigits_u[] = "0123456789ABCDEF"; 134177633Sdfr#define NS_IN6ADDRSZ 16 135177633Sdfr#define NS_INT16SZ 2 136177633Sdfr u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 137177633Sdfr const char *xdigits, *curtok; 138177633Sdfr int ch, seen_xdigits; 139177633Sdfr u_int val; 140177633Sdfr 141177633Sdfr memset((tp = tmp), '\0', NS_IN6ADDRSZ); 142177633Sdfr endp = tp + NS_IN6ADDRSZ; 143177633Sdfr colonp = NULL; 144177633Sdfr /* Leading :: requires some special handling. */ 145177633Sdfr if (*src == ':') 146177633Sdfr if (*++src != ':') 147177633Sdfr return (0); 148177633Sdfr curtok = src; 149177633Sdfr seen_xdigits = 0; 150177633Sdfr val = 0; 151177633Sdfr while ((ch = *src++) != '\0') { 152177633Sdfr const char *pch; 153177633Sdfr 154177633Sdfr if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 155177633Sdfr pch = strchr((xdigits = xdigits_u), ch); 156177633Sdfr if (pch != NULL) { 157177633Sdfr val <<= 4; 158177633Sdfr val |= (pch - xdigits); 159177633Sdfr if (++seen_xdigits > 4) 160177633Sdfr return (0); 161177633Sdfr continue; 162177633Sdfr } 163177633Sdfr if (ch == ':') { 164177633Sdfr curtok = src; 165177633Sdfr if (!seen_xdigits) { 166177633Sdfr if (colonp) 167177633Sdfr return (0); 168177633Sdfr colonp = tp; 169177633Sdfr continue; 170177633Sdfr } else if (*src == '\0') { 171177633Sdfr return (0); 172177633Sdfr } 173177633Sdfr if (tp + NS_INT16SZ > endp) 174177633Sdfr return (0); 175177633Sdfr *tp++ = (u_char) (val >> 8) & 0xff; 176177633Sdfr *tp++ = (u_char) val & 0xff; 177177633Sdfr seen_xdigits = 0; 178177633Sdfr val = 0; 179177633Sdfr continue; 180177633Sdfr } 181177633Sdfr if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 182177633Sdfr inet_pton4(curtok, tp) > 0) { 183177633Sdfr tp += NS_INADDRSZ; 184177633Sdfr seen_xdigits = 0; 185177633Sdfr break; /*%< '\\0' was seen by inet_pton4(). */ 186177633Sdfr } 187177633Sdfr return (0); 188177633Sdfr } 189177633Sdfr if (seen_xdigits) { 190177633Sdfr if (tp + NS_INT16SZ > endp) 191177633Sdfr return (0); 192177633Sdfr *tp++ = (u_char) (val >> 8) & 0xff; 193177633Sdfr *tp++ = (u_char) val & 0xff; 194177633Sdfr } 195177633Sdfr if (colonp != NULL) { 196177633Sdfr /* 197177633Sdfr * Since some memmove()'s erroneously fail to handle 198177633Sdfr * overlapping regions, we'll do the shift by hand. 199177633Sdfr */ 200177633Sdfr const int n = tp - colonp; 201177633Sdfr int i; 202177633Sdfr 203177633Sdfr if (tp == endp) 204177633Sdfr return (0); 205177633Sdfr for (i = 1; i <= n; i++) { 206177633Sdfr endp[- i] = colonp[n - i]; 207177633Sdfr colonp[n - i] = 0; 208177633Sdfr } 209177633Sdfr tp = endp; 210177633Sdfr } 211177633Sdfr if (tp != endp) 212177633Sdfr return (0); 213177633Sdfr memcpy(dst, tmp, NS_IN6ADDRSZ); 214177633Sdfr return (1); 215177633Sdfr} 216177633Sdfr 217177633Sdfr/* 218177633Sdfr * Weak aliases for applications that use certain private entry points, 219177633Sdfr * and fail to include <arpa/inet.h>. 220177633Sdfr */ 221177633Sdfr#undef inet_pton 222177633Sdfr__weak_reference(__inet_pton, inet_pton); 223177633Sdfr 224177633Sdfr/*! \file */ 225