inet_pton.c revision 177685
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 177685 2008-03-28 09:50:32Z 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> 30177685Sdfr#include <rpc/rpc_com.h> 31177633Sdfr 32177685Sdfr#if __FreeBSD_version < 700000 33177685Sdfr#define strchr index 34177685Sdfr#endif 35177685Sdfr 36177633Sdfr/*% 37177633Sdfr * WARNING: Don't even consider trying to compile this on a system where 38177633Sdfr * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX. 39177633Sdfr */ 40177633Sdfr 41177633Sdfrstatic int inet_pton4(const char *src, u_char *dst); 42177633Sdfrstatic int inet_pton6(const char *src, u_char *dst); 43177633Sdfr 44177633Sdfr/* int 45177633Sdfr * inet_pton(af, src, dst) 46177633Sdfr * convert from presentation format (which usually means ASCII printable) 47177633Sdfr * to network format (which is usually some kind of binary format). 48177633Sdfr * return: 49177633Sdfr * 1 if the address was valid for the specified address family 50177633Sdfr * 0 if the address wasn't valid (`dst' is untouched in this case) 51177633Sdfr * -1 if some other error occurred (`dst' is untouched in this case, too) 52177633Sdfr * author: 53177633Sdfr * Paul Vixie, 1996. 54177633Sdfr */ 55177633Sdfrint 56177633Sdfr__rpc_inet_pton(int af, const char * __restrict src, void * __restrict dst) 57177633Sdfr{ 58177633Sdfr switch (af) { 59177633Sdfr case AF_INET: 60177633Sdfr return (inet_pton4(src, dst)); 61177633Sdfr case AF_INET6: 62177633Sdfr return (inet_pton6(src, dst)); 63177633Sdfr default: 64177633Sdfr return (-1); 65177633Sdfr } 66177633Sdfr /* NOTREACHED */ 67177633Sdfr} 68177633Sdfr 69177633Sdfr/* int 70177633Sdfr * inet_pton4(src, dst) 71177633Sdfr * like inet_aton() but without all the hexadecimal and shorthand. 72177633Sdfr * return: 73177633Sdfr * 1 if `src' is a valid dotted quad, else 0. 74177633Sdfr * notice: 75177633Sdfr * does not touch `dst' unless it's returning 1. 76177633Sdfr * author: 77177633Sdfr * Paul Vixie, 1996. 78177633Sdfr */ 79177633Sdfrstatic int 80177633Sdfrinet_pton4(const char *src, u_char *dst) 81177633Sdfr{ 82177633Sdfr static const char digits[] = "0123456789"; 83177633Sdfr int saw_digit, octets, ch; 84177633Sdfr#define NS_INADDRSZ 4 85177633Sdfr u_char tmp[NS_INADDRSZ], *tp; 86177633Sdfr 87177633Sdfr saw_digit = 0; 88177633Sdfr octets = 0; 89177633Sdfr *(tp = tmp) = 0; 90177633Sdfr while ((ch = *src++) != '\0') { 91177633Sdfr const char *pch; 92177633Sdfr 93177633Sdfr if ((pch = strchr(digits, ch)) != NULL) { 94177633Sdfr u_int new = *tp * 10 + (pch - digits); 95177633Sdfr 96177633Sdfr if (saw_digit && *tp == 0) 97177633Sdfr return (0); 98177633Sdfr if (new > 255) 99177633Sdfr return (0); 100177633Sdfr *tp = new; 101177633Sdfr if (!saw_digit) { 102177633Sdfr if (++octets > 4) 103177633Sdfr return (0); 104177633Sdfr saw_digit = 1; 105177633Sdfr } 106177633Sdfr } else if (ch == '.' && saw_digit) { 107177633Sdfr if (octets == 4) 108177633Sdfr return (0); 109177633Sdfr *++tp = 0; 110177633Sdfr saw_digit = 0; 111177633Sdfr } else 112177633Sdfr return (0); 113177633Sdfr } 114177633Sdfr if (octets < 4) 115177633Sdfr return (0); 116177633Sdfr memcpy(dst, tmp, NS_INADDRSZ); 117177633Sdfr return (1); 118177633Sdfr} 119177633Sdfr 120177633Sdfr/* int 121177633Sdfr * inet_pton6(src, dst) 122177633Sdfr * convert presentation level address to network order binary form. 123177633Sdfr * return: 124177633Sdfr * 1 if `src' is a valid [RFC1884 2.2] address, else 0. 125177633Sdfr * notice: 126177633Sdfr * (1) does not touch `dst' unless it's returning 1. 127177633Sdfr * (2) :: in a full address is silently ignored. 128177633Sdfr * credit: 129177633Sdfr * inspired by Mark Andrews. 130177633Sdfr * author: 131177633Sdfr * Paul Vixie, 1996. 132177633Sdfr */ 133177633Sdfrstatic int 134177633Sdfrinet_pton6(const char *src, u_char *dst) 135177633Sdfr{ 136177633Sdfr static const char xdigits_l[] = "0123456789abcdef", 137177633Sdfr xdigits_u[] = "0123456789ABCDEF"; 138177633Sdfr#define NS_IN6ADDRSZ 16 139177633Sdfr#define NS_INT16SZ 2 140177633Sdfr u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp; 141177633Sdfr const char *xdigits, *curtok; 142177633Sdfr int ch, seen_xdigits; 143177633Sdfr u_int val; 144177633Sdfr 145177633Sdfr memset((tp = tmp), '\0', NS_IN6ADDRSZ); 146177633Sdfr endp = tp + NS_IN6ADDRSZ; 147177633Sdfr colonp = NULL; 148177633Sdfr /* Leading :: requires some special handling. */ 149177633Sdfr if (*src == ':') 150177633Sdfr if (*++src != ':') 151177633Sdfr return (0); 152177633Sdfr curtok = src; 153177633Sdfr seen_xdigits = 0; 154177633Sdfr val = 0; 155177633Sdfr while ((ch = *src++) != '\0') { 156177633Sdfr const char *pch; 157177633Sdfr 158177633Sdfr if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL) 159177633Sdfr pch = strchr((xdigits = xdigits_u), ch); 160177633Sdfr if (pch != NULL) { 161177633Sdfr val <<= 4; 162177633Sdfr val |= (pch - xdigits); 163177633Sdfr if (++seen_xdigits > 4) 164177633Sdfr return (0); 165177633Sdfr continue; 166177633Sdfr } 167177633Sdfr if (ch == ':') { 168177633Sdfr curtok = src; 169177633Sdfr if (!seen_xdigits) { 170177633Sdfr if (colonp) 171177633Sdfr return (0); 172177633Sdfr colonp = tp; 173177633Sdfr continue; 174177633Sdfr } else if (*src == '\0') { 175177633Sdfr return (0); 176177633Sdfr } 177177633Sdfr if (tp + NS_INT16SZ > endp) 178177633Sdfr return (0); 179177633Sdfr *tp++ = (u_char) (val >> 8) & 0xff; 180177633Sdfr *tp++ = (u_char) val & 0xff; 181177633Sdfr seen_xdigits = 0; 182177633Sdfr val = 0; 183177633Sdfr continue; 184177633Sdfr } 185177633Sdfr if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) && 186177633Sdfr inet_pton4(curtok, tp) > 0) { 187177633Sdfr tp += NS_INADDRSZ; 188177633Sdfr seen_xdigits = 0; 189177633Sdfr break; /*%< '\\0' was seen by inet_pton4(). */ 190177633Sdfr } 191177633Sdfr return (0); 192177633Sdfr } 193177633Sdfr if (seen_xdigits) { 194177633Sdfr if (tp + NS_INT16SZ > endp) 195177633Sdfr return (0); 196177633Sdfr *tp++ = (u_char) (val >> 8) & 0xff; 197177633Sdfr *tp++ = (u_char) val & 0xff; 198177633Sdfr } 199177633Sdfr if (colonp != NULL) { 200177633Sdfr /* 201177633Sdfr * Since some memmove()'s erroneously fail to handle 202177633Sdfr * overlapping regions, we'll do the shift by hand. 203177633Sdfr */ 204177633Sdfr const int n = tp - colonp; 205177633Sdfr int i; 206177633Sdfr 207177633Sdfr if (tp == endp) 208177633Sdfr return (0); 209177633Sdfr for (i = 1; i <= n; i++) { 210177633Sdfr endp[- i] = colonp[n - i]; 211177633Sdfr colonp[n - i] = 0; 212177633Sdfr } 213177633Sdfr tp = endp; 214177633Sdfr } 215177633Sdfr if (tp != endp) 216177633Sdfr return (0); 217177633Sdfr memcpy(dst, tmp, NS_IN6ADDRSZ); 218177633Sdfr return (1); 219177633Sdfr} 220177633Sdfr 221177633Sdfr/* 222177633Sdfr * Weak aliases for applications that use certain private entry points, 223177633Sdfr * and fail to include <arpa/inet.h>. 224177633Sdfr */ 225177633Sdfr#undef inet_pton 226177633Sdfr__weak_reference(__inet_pton, inet_pton); 227177633Sdfr 228177633Sdfr/*! \file */ 229