lib/libc/inet/inet_pton.c
C | 309 lines | 200 code | 25 blank | 84 comment | 78 complexity | e2fad109d0f1302942628ab27128b88d MD5 | raw file
Possible License(s): MIT, WTFPL, AGPL-1.0, BSD-3-Clause, GPL-3.0, LGPL-2.0, JSON, 0BSD
- /* $NetBSD: inet_pton.c,v 1.7 2009/04/12 17:07:17 christos Exp $ */
- /*
- * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
- * Copyright (c) 1996,1999 by Internet Software Consortium.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
- #include <sys/cdefs.h>
- #if defined(LIBC_SCCS) && !defined(lint)
- #if 0
- static const char rcsid[] = "Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp";
- #else
- __RCSID("$NetBSD: inet_pton.c,v 1.7 2009/04/12 17:07:17 christos Exp $");
- #endif
- #endif /* LIBC_SCCS and not lint */
- #include "port_before.h"
- #include "namespace.h"
- #include <sys/param.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <arpa/nameser.h>
- #include <string.h>
- #include <assert.h>
- #include <ctype.h>
- #include <errno.h>
- #include "port_after.h"
- #ifdef __weak_alias
- __weak_alias(inet_pton,_inet_pton)
- #endif
- /*%
- * WARNING: Don't even consider trying to compile this on a system where
- * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
- */
- static int inet_pton4(const char *src, u_char *dst, int pton);
- static int inet_pton6(const char *src, u_char *dst);
- /* int
- * inet_pton(af, src, dst)
- * convert from presentation format (which usually means ASCII printable)
- * to network format (which is usually some kind of binary format).
- * return:
- * 1 if the address was valid for the specified address family
- * 0 if the address wasn't valid (`dst' is untouched in this case)
- * -1 if some other error occurred (`dst' is untouched in this case, too)
- * author:
- * Paul Vixie, 1996.
- */
- int
- inet_pton(int af, const char *src, void *dst)
- {
- _DIAGASSERT(src != NULL);
- _DIAGASSERT(dst != NULL);
- switch (af) {
- case AF_INET:
- return (inet_pton4(src, dst, 1));
- case AF_INET6:
- return (inet_pton6(src, dst));
- default:
- errno = EAFNOSUPPORT;
- return (-1);
- }
- /* NOTREACHED */
- }
- /* int
- * inet_pton4(src, dst, pton)
- * when last arg is 0: inet_aton(). with hexadecimal, octal and shorthand.
- * when last arg is 1: inet_pton(). decimal dotted-quad only.
- * return:
- * 1 if `src' is a valid input, else 0.
- * notice:
- * does not touch `dst' unless it's returning 1.
- * author:
- * Paul Vixie, 1996.
- */
- static int
- inet_pton4(const char *src, u_char *dst, int pton)
- {
- u_int32_t val;
- u_int digit, base;
- int n;
- unsigned char c;
- u_int parts[4];
- register u_int *pp = parts;
- _DIAGASSERT(src != NULL);
- _DIAGASSERT(dst != NULL);
- c = *src;
- for (;;) {
- /*
- * Collect number up to ``.''.
- * Values are specified as for C:
- * 0x=hex, 0=octal, isdigit=decimal.
- */
- if (!isdigit(c))
- return (0);
- val = 0; base = 10;
- if (c == '0') {
- c = *++src;
- if (c == 'x' || c == 'X')
- base = 16, c = *++src;
- else if (isdigit(c) && c != '9')
- base = 8;
- }
- /* inet_pton() takes decimal only */
- if (pton && base != 10)
- return (0);
- for (;;) {
- if (isdigit(c)) {
- digit = c - '0';
- if (digit >= base)
- break;
- val = (val * base) + digit;
- c = *++src;
- } else if (base == 16 && isxdigit(c)) {
- digit = c + 10 - (islower(c) ? 'a' : 'A');
- if (digit >= 16)
- break;
- val = (val << 4) | digit;
- c = *++src;
- } else
- break;
- }
- if (c == '.') {
- /*
- * Internet format:
- * a.b.c.d
- * a.b.c (with c treated as 16 bits)
- * a.b (with b treated as 24 bits)
- * a (with a treated as 32 bits)
- */
- if (pp >= parts + 3)
- return (0);
- *pp++ = val;
- c = *++src;
- } else
- break;
- }
- /*
- * Check for trailing characters.
- */
- if (c != '\0' && !isspace(c))
- return (0);
- /*
- * Concoct the address according to
- * the number of parts specified.
- */
- n = pp - parts + 1;
- /* inet_pton() takes dotted-quad only. it does not take shorthand. */
- if (pton && n != 4)
- return (0);
- switch (n) {
- case 0:
- return (0); /* initial nondigit */
- case 1: /* a -- 32 bits */
- break;
- case 2: /* a.b -- 8.24 bits */
- if (parts[0] > 0xff || val > 0xffffff)
- return (0);
- val |= parts[0] << 24;
- break;
- case 3: /* a.b.c -- 8.8.16 bits */
- if ((parts[0] | parts[1]) > 0xff || val > 0xffff)
- return (0);
- val |= (parts[0] << 24) | (parts[1] << 16);
- break;
- case 4: /* a.b.c.d -- 8.8.8.8 bits */
- if ((parts[0] | parts[1] | parts[2] | val) > 0xff)
- return (0);
- val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
- break;
- }
- if (dst) {
- val = htonl(val);
- memcpy(dst, &val, NS_INADDRSZ);
- }
- return (1);
- }
- /* int
- * inet_pton6(src, dst)
- * convert presentation level address to network order binary form.
- * return:
- * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
- * notice:
- * (1) does not touch `dst' unless it's returning 1.
- * (2) :: in a full address is silently ignored.
- * credit:
- * inspired by Mark Andrews.
- * author:
- * Paul Vixie, 1996.
- */
- static int
- inet_pton6(const char *src, u_char *dst)
- {
- static const char xdigits_l[] = "0123456789abcdef",
- xdigits_u[] = "0123456789ABCDEF";
- u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
- const char *xdigits, *curtok;
- int ch, seen_xdigits;
- u_int val;
- _DIAGASSERT(src != NULL);
- _DIAGASSERT(dst != NULL);
- memset((tp = tmp), '\0', NS_IN6ADDRSZ);
- endp = tp + NS_IN6ADDRSZ;
- colonp = NULL;
- /* Leading :: requires some special handling. */
- if (*src == ':')
- if (*++src != ':')
- return (0);
- curtok = src;
- seen_xdigits = 0;
- val = 0;
- while ((ch = *src++) != '\0') {
- const char *pch;
- if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
- pch = strchr((xdigits = xdigits_u), ch);
- if (pch != NULL) {
- val <<= 4;
- val |= (pch - xdigits);
- if (++seen_xdigits > 4)
- return (0);
- continue;
- }
- if (ch == ':') {
- curtok = src;
- if (!seen_xdigits) {
- if (colonp)
- return (0);
- colonp = tp;
- continue;
- } else if (*src == '\0')
- return (0);
- if (tp + NS_INT16SZ > endp)
- return (0);
- *tp++ = (u_char) (val >> 8) & 0xff;
- *tp++ = (u_char) val & 0xff;
- seen_xdigits = 0;
- val = 0;
- continue;
- }
- if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
- inet_pton4(curtok, tp, 1) > 0) {
- tp += NS_INADDRSZ;
- seen_xdigits = 0;
- break; /*%< '\\0' was seen by inet_pton4(). */
- }
- return (0);
- }
- if (seen_xdigits) {
- if (tp + NS_INT16SZ > endp)
- return (0);
- *tp++ = (u_char) (val >> 8) & 0xff;
- *tp++ = (u_char) val & 0xff;
- }
- if (colonp != NULL) {
- /*
- * Since some memmove()'s erroneously fail to handle
- * overlapping regions, we'll do the shift by hand.
- */
- const int n = tp - colonp;
- int i;
- if (tp == endp)
- return (0);
- for (i = 1; i <= n; i++) {
- endp[- i] = colonp[n - i];
- colonp[n - i] = 0;
- }
- tp = endp;
- }
- if (tp != endp)
- return (0);
- memcpy(dst, tmp, NS_IN6ADDRSZ);
- return (1);
- }
- /*! \file */