GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/net/inet_net_ntop.c Lines: 0 49 0.0 %
Date: 2017-11-13 Branches: 0 47 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: inet_net_ntop.c,v 1.8 2015/05/14 11:52:43 jsg Exp $	*/
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/*
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 * Copyright (c) 2012 by Gilles Chehade <gilles@openbsd.org>
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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 <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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static char *inet_net_ntop_ipv4(const u_char *, int, char *, size_t);
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static char *inet_net_ntop_ipv6(const u_char *, int, char *, size_t);
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/*
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 * char *
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 * inet_net_ntop(af, src, bits, dst, size)
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 *	convert network number from network to presentation format.
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 *	generates CIDR style result always.
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 * return:
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 *	pointer to dst, or NULL if an error occurred (check errno).
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 * author:
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 *	Paul Vixie (ISC), July 1996
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 */
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char *
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inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
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{
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	switch (af) {
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	case AF_INET:
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		return (inet_net_ntop_ipv4(src, bits, dst, size));
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	case AF_INET6:
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		return (inet_net_ntop_ipv6(src, bits, dst, size));
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	default:
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		errno = EAFNOSUPPORT;
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		return (NULL);
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	}
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}
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/*
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 * static char *
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 * inet_net_ntop_ipv4(src, bits, dst, size)
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 *	convert IPv4 network number from network to presentation format.
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 *	generates CIDR style result always.
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 * return:
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 *	pointer to dst, or NULL if an error occurred (check errno).
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 * note:
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 *	network byte order assumed.  this means 192.5.5.240/28 has
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 *	0x11110000 in its fourth octet.
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 * author:
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 *	Paul Vixie (ISC), July 1996
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 */
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static char *
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inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
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{
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	char *odst = dst;
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	u_int m;
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	int b;
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	char *ep;
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	int advance;
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	ep = dst + size;
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	if (ep <= dst)
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		goto emsgsize;
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	if (bits < 0 || bits > 32) {
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		errno = EINVAL;
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		return (NULL);
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	}
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	if (bits == 0) {
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		if (ep - dst < sizeof "0")
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			goto emsgsize;
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		*dst++ = '0';
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		*dst = '\0';
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	}
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	/* Format whole octets. */
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	for (b = bits / 8; b > 0; b--) {
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		if (ep - dst < sizeof "255.")
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			goto emsgsize;
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		advance = snprintf(dst, ep - dst, "%u", *src++);
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		if (advance <= 0 || advance >= ep - dst)
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			goto emsgsize;
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		dst += advance;
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		if (b > 1) {
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			if (dst + 1 >= ep)
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				goto emsgsize;
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			*dst++ = '.';
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			*dst = '\0';
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		}
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	}
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	/* Format partial octet. */
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	b = bits % 8;
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	if (b > 0) {
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		if (ep - dst < sizeof ".255")
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			goto emsgsize;
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		if (dst != odst)
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			*dst++ = '.';
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		m = ((1 << b) - 1) << (8 - b);
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		advance = snprintf(dst, ep - dst, "%u", *src & m);
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		if (advance <= 0 || advance >= ep - dst)
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			goto emsgsize;
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		dst += advance;
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	}
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	/* Format CIDR /width. */
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	if (ep - dst < sizeof "/32")
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		goto emsgsize;
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	advance = snprintf(dst, ep - dst, "/%u", bits);
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	if (advance <= 0 || advance >= ep - dst)
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		goto emsgsize;
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	dst += advance;
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	return (odst);
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 emsgsize:
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	errno = EMSGSIZE;
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	return (NULL);
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}
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static char *
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inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
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{
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	int	ret;
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	char	buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255:255:255:255/128")];
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	if (bits < 0 || bits > 128) {
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		errno = EINVAL;
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		return (NULL);
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	}
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	if (inet_ntop(AF_INET6, src, buf, size) == NULL)
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		return (NULL);
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	ret = snprintf(dst, size, "%s/%d", buf, bits);
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	if (ret == -1 || ret >= size) {
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		errno = EMSGSIZE;
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		return (NULL);
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	}
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	return (dst);
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}