GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/net/inet_pton.c Lines: 0 75 0.0 %
Date: 2017-11-13 Branches: 0 70 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: inet_pton.c,v 1.10 2015/09/13 21:36:08 guenther Exp $	*/
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/* Copyright (c) 1996 by Internet Software Consortium.
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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 * SOFTWARE.
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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 <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <string.h>
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#include <errno.h>
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/*
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 * WARNING: Don't even consider trying to compile this on a system where
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 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
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 */
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static int	inet_pton4(const char *src, u_char *dst);
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static int	inet_pton6(const char *src, u_char *dst);
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/* int
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 * inet_pton(af, src, dst)
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 *	convert from presentation format (which usually means ASCII printable)
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 *	to network format (which is usually some kind of binary format).
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 * return:
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 *	1 if the address was valid for the specified address family
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 *	0 if the address wasn't valid (`dst' is untouched in this case)
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 *	-1 if some other error occurred (`dst' is untouched in this case, too)
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 * author:
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 *	Paul Vixie, 1996.
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 */
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int
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inet_pton(int af, const char *src, void *dst)
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{
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	switch (af) {
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	case AF_INET:
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		return (inet_pton4(src, dst));
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	case AF_INET6:
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		return (inet_pton6(src, dst));
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	default:
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		errno = EAFNOSUPPORT;
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		return (-1);
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	}
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	/* NOTREACHED */
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}
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DEF_WEAK(inet_pton);
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/* int
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 * inet_pton4(src, dst)
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 *	like inet_aton() but without all the hexadecimal and shorthand.
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 * return:
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 *	1 if `src' is a valid dotted quad, else 0.
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 * notice:
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 *	does not touch `dst' unless it's returning 1.
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 * author:
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 *	Paul Vixie, 1996.
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 */
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static int
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inet_pton4(const char *src, u_char *dst)
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{
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	static const char digits[] = "0123456789";
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	int saw_digit, octets, ch;
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	u_char tmp[INADDRSZ], *tp;
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	saw_digit = 0;
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	octets = 0;
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	*(tp = tmp) = 0;
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	while ((ch = *src++) != '\0') {
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		const char *pch;
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		if ((pch = strchr(digits, ch)) != NULL) {
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			u_int new = *tp * 10 + (pch - digits);
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			if (new > 255)
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				return (0);
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			if (! saw_digit) {
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				if (++octets > 4)
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					return (0);
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				saw_digit = 1;
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			}
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			*tp = new;
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		} else if (ch == '.' && saw_digit) {
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			if (octets == 4)
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				return (0);
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			*++tp = 0;
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			saw_digit = 0;
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		} else
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			return (0);
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	}
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	if (octets < 4)
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		return (0);
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	memcpy(dst, tmp, INADDRSZ);
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	return (1);
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}
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/* int
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 * inet_pton6(src, dst)
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 *	convert presentation level address to network order binary form.
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 * return:
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 *	1 if `src' is a valid [RFC1884 2.2] address, else 0.
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 * notice:
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 *	does not touch `dst' unless it's returning 1.
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 * credit:
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 *	inspired by Mark Andrews.
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 * author:
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 *	Paul Vixie, 1996.
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 */
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static int
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inet_pton6(const char *src, u_char *dst)
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{
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	static const char xdigits_l[] = "0123456789abcdef",
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			  xdigits_u[] = "0123456789ABCDEF";
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	u_char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
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	const char *xdigits, *curtok;
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	int ch, saw_xdigit, count_xdigit;
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	u_int val;
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	memset((tp = tmp), '\0', IN6ADDRSZ);
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	endp = tp + IN6ADDRSZ;
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	colonp = NULL;
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	/* Leading :: requires some special handling. */
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	if (*src == ':')
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		if (*++src != ':')
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			return (0);
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	curtok = src;
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	saw_xdigit = count_xdigit = 0;
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	val = 0;
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	while ((ch = *src++) != '\0') {
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		const char *pch;
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		if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
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			pch = strchr((xdigits = xdigits_u), ch);
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		if (pch != NULL) {
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			if (count_xdigit >= 4)
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				return (0);
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			val <<= 4;
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			val |= (pch - xdigits);
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			if (val > 0xffff)
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				return (0);
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			saw_xdigit = 1;
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			count_xdigit++;
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			continue;
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		}
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		if (ch == ':') {
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			curtok = src;
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			if (!saw_xdigit) {
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				if (colonp)
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					return (0);
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				colonp = tp;
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				continue;
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			} else if (*src == '\0') {
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				return (0);
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			}
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			if (tp + INT16SZ > endp)
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				return (0);
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			*tp++ = (u_char) (val >> 8) & 0xff;
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			*tp++ = (u_char) val & 0xff;
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			saw_xdigit = 0;
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			count_xdigit = 0;
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			val = 0;
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			continue;
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		}
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		if (ch == '.' && ((tp + INADDRSZ) <= endp) &&
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		    inet_pton4(curtok, tp) > 0) {
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			tp += INADDRSZ;
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			saw_xdigit = 0;
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			count_xdigit = 0;
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			break;	/* '\0' was seen by inet_pton4(). */
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		}
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		return (0);
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	}
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	if (saw_xdigit) {
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		if (tp + INT16SZ > endp)
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			return (0);
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		*tp++ = (u_char) (val >> 8) & 0xff;
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		*tp++ = (u_char) val & 0xff;
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	}
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	if (colonp != NULL) {
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		/*
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		 * Since some memmove()'s erroneously fail to handle
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		 * overlapping regions, we'll do the shift by hand.
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		 */
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		const int n = tp - colonp;
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		int i;
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		if (tp == endp)
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			return (0);
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		for (i = 1; i <= n; i++) {
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			endp[- i] = colonp[n - i];
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			colonp[n - i] = 0;
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		}
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		tp = endp;
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	}
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	if (tp != endp)
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		return (0);
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	memcpy(dst, tmp, IN6ADDRSZ);
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	return (1);
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}