[thirdparty/squid.git] / compat / inet_ntop.c

/*
 *  Shamelessly duplicated from the bind9 public sources
 *  for use by the Squid Project under ISC written permission
 *  included "as found" below.
 *
 * Update/Maintenance History:
 *
 *    24-Sep-2007 : Copied from bind 9.3.3
 * 			- Added protection around libray headers
 * 			- Altered configure checks
 * 			- Un-hacked slightly to use system gethostbyname()
 *
 *    06-Oct-2007 : Various fixes to allow the build on MinGW
 *
 *    28-Oct-2007: drop some dead code. now tested working without.
 *
 * Squid CVS $Id$
 *
 *  Original License and code follows.
 */

#include "config.h"

#if !HAVE_INET_NTOP
#include "inet_ntop.h"

/*
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "inet_ntop.c,v 1.1.2.1.8.2 2005/11/03 23:08:40 marka Exp";
#endif /* LIBC_SCCS and not lint */

#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if HAVE_ARPA_NAMESER_H
#include <arpa/nameser.h>
#endif

#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

#if ! defined(NS_INADDRSZ)
#define NS_INADDRSZ      4
#endif
#if ! defined(NS_IN6ADDRSZ)
#define NS_IN6ADDRSZ    16
#endif
#if ! defined(NS_INT16SZ)
#define NS_INT16SZ      2
#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 const char *inet_ntop4 (const u_char *src, char *dst, size_t size);
static const char *inet_ntop6 (const u_char *src, char *dst, size_t size);

/* char *
 * inet_ntop(af, src, dst, size)
 *	convert a network format address to presentation format.
 * return:
 *	pointer to presentation format address (`dst'), or NULL (see errno).
 * author:
 *	Paul Vixie, 1996.
 */
const char *
xinet_ntop(af, src, dst, size)
int af;
const void *src;
char *dst;
size_t size;
{
    switch (af) {
    case AF_INET:
        return (inet_ntop4(src, dst, size));
    case AF_INET6:
        return (inet_ntop6(src, dst, size));
    default:
        errno = EAFNOSUPPORT;
        return (NULL);
    }
    /* NOTREACHED */
}

/* const char *
 * inet_ntop4(src, dst, size)
 *	format an IPv4 address
 * return:
 *	`dst' (as a const)
 * notes:
 *	(1) uses no statics
 *	(2) takes a u_char* not an in_addr as input
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
inet_ntop4(src, dst, size)
const u_char *src;
char *dst;
size_t size;
{
    static const char fmt[] = "%u.%u.%u.%u";
    char tmp[sizeof "255.255.255.255"];

    if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) >= size) {
        errno = ENOSPC;
        return (NULL);
    }
    strcpy(dst, tmp);
    return (dst);
}

/* const char *
 * inet_ntop6(src, dst, size)
 *	convert IPv6 binary address into presentation (printable) format
 * author:
 *	Paul Vixie, 1996.
 */
static const char *
inet_ntop6(src, dst, size)
const u_char *src;
char *dst;
size_t size;
{
    /*
     * Note that int32_t and int16_t need only be "at least" large enough
     * to contain a value of the specified size.  On some systems, like
     * Crays, there is no such thing as an integer variable with 16 bits.
     * Keep this in mind if you think this function should have been coded
     * to use pointer overlays.  All the world's not a VAX.
     */
    char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
    struct { int base, len; } best, cur;
    u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
    int i;

    /*
     * Preprocess:
     *	Copy the input (bytewise) array into a wordwise array.
     *	Find the longest run of 0x00's in src[] for :: shorthanding.
     */
    memset(words, '\0', sizeof words);
    for (i = 0; i < NS_IN6ADDRSZ; i++)
        words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
    best.base = -1;
    best.len = 0;
    cur.base = -1;
    cur.len = 0;
    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
        if (words[i] == 0) {
            if (cur.base == -1)
                cur.base = i, cur.len = 1;
            else
                cur.len++;
        } else {
            if (cur.base != -1) {
                if (best.base == -1 || cur.len > best.len)
                    best = cur;
                cur.base = -1;
            }
        }
    }
    if (cur.base != -1) {
        if (best.base == -1 || cur.len > best.len)
            best = cur;
    }
    if (best.base != -1 && best.len < 2)
        best.base = -1;

    /*
     * Format the result.
     */
    tp = tmp;
    for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
        /* Are we inside the best run of 0x00's? */
        if (best.base != -1 && i >= best.base &&
                i < (best.base + best.len)) {
            if (i == best.base)
                *tp++ = ':';
            continue;
        }
        /* Are we following an initial run of 0x00s or any real hex? */
        if (i != 0)
            *tp++ = ':';
        /* Is this address an encapsulated IPv4? */
        if (i == 6 && best.base == 0 && (best.len == 6 ||
                                         (best.len == 7 && words[7] != 0x0001) ||
                                         (best.len == 5 && words[5] == 0xffff))) {
            if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
                return (NULL);
            tp += strlen(tp);
            break;
        }
        tp += SPRINTF((tp, "%x", words[i]));
    }
    /* Was it a trailing run of 0x00's? */
    if (best.base != -1 && (best.base + best.len) ==
            (NS_IN6ADDRSZ / NS_INT16SZ))
        *tp++ = ':';
    *tp++ = '\0';

    /*
     * Check for overflow, copy, and we're done.
     */
    if ((size_t)(tp - tmp) > size) {
        errno = ENOSPC;
        return (NULL);
    }
    strcpy(dst, tmp);
    return (dst);
}

#endif /* HAVE_INET_NTOP */
Commit	Line	Data
0e076fb1	1	/*
	2	* Shamelessly duplicated from the bind9 public sources
	3	* for use by the Squid Project under ISC written permission
	4	* included "as found" below.
	5	*
	6	* Update/Maintenance History:
	7	*
	8	* 24-Sep-2007 : Copied from bind 9.3.3
	9	* - Added protection around libray headers
	10	* - Altered configure checks
	11	* - Un-hacked slightly to use system gethostbyname()
	12	*
	13	* 06-Oct-2007 : Various fixes to allow the build on MinGW
	14	*
	15	* 28-Oct-2007: drop some dead code. now tested working without.
	16	*
262a0e14	17	* Squid CVS $Id$
0e076fb1	18	*
	19	* Original License and code follows.
	20	*/
	21
	22	#include "config.h"
	23
32d002cb	24	#if !HAVE_INET_NTOP
48a146e7	25	#include "inet_ntop.h"
0e076fb1	26
	27	/*
	28	* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
	29	* Copyright (c) 1996-1999 by Internet Software Consortium.
	30	*
	31	* Permission to use, copy, modify, and distribute this software for any
	32	* purpose with or without fee is hereby granted, provided that the above
	33	* copyright notice and this permission notice appear in all copies.
	34	*
	35	* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
	36	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	37	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
	38	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	39	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	40	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	41	* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	42	*/
	43
	44	#if defined(LIBC_SCCS) && !defined(lint)
	45	static const char rcsid[] = "inet_ntop.c,v 1.1.2.1.8.2 2005/11/03 23:08:40 marka Exp";
	46	#endif /* LIBC_SCCS and not lint */
	47
	48	#if HAVE_SYS_PARAM_H
	49	#include <sys/param.h>
	50	#endif
	51	#if HAVE_SYS_TYPES_H
	52	#include <sys/types.h>
	53	#endif
	54	#if HAVE_SYS_SOCKET_H
	55	#include <sys/socket.h>
	56	#endif
	57
	58	#if HAVE_NETINET_IN_H
	59	#include <netinet/in.h>
	60	#endif
	61	#if HAVE_ARPA_INET_H
	62	#include <arpa/inet.h>
	63	#endif
	64	#if HAVE_ARPA_NAMESER_H
	65	#include <arpa/nameser.h>
	66	#endif
	67
	68	#if HAVE_ERRNO_H
	69	#include <errno.h>
	70	#endif
0e076fb1	71	#if HAVE_STRING_H
	72	#include <string.h>
	73	#endif
	74
	75	#ifdef SPRINTF_CHAR
	76	# define SPRINTF(x) strlen(sprintf/**/x)
	77	#else
	78	# define SPRINTF(x) ((size_t)sprintf x)
	79	#endif
	80
	81	#if ! defined(NS_INADDRSZ)
	82	#define NS_INADDRSZ 4
	83	#endif
	84	#if ! defined(NS_IN6ADDRSZ)
	85	#define NS_IN6ADDRSZ 16
	86	#endif
	87	#if ! defined(NS_INT16SZ)
	88	#define NS_INT16SZ 2
	89	#endif
	90
	91	/*
	92	* WARNING: Don't even consider trying to compile this on a system where
	93	* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
	94	*/
	95
	96	static const char inet_ntop4 (const u_char src, char *dst, size_t size);
	97	static const char inet_ntop6 (const u_char src, char *dst, size_t size);
	98
	99	/* char *
	100	* inet_ntop(af, src, dst, size)
	101	* convert a network format address to presentation format.
	102	* return:
	103	* pointer to presentation format address (`dst'), or NULL (see errno).
	104	* author:
	105	* Paul Vixie, 1996.
	106	*/
	107	const char *
	108	xinet_ntop(af, src, dst, size)
26ac0430 AJ	109	int af;
	110	const void *src;
	111	char *dst;
	112	size_t size;
0e076fb1	113	{
26ac0430 AJ	114	switch (af) {
	115	case AF_INET:
	116	return (inet_ntop4(src, dst, size));
	117	case AF_INET6:
	118	return (inet_ntop6(src, dst, size));
	119	default:
	120	errno = EAFNOSUPPORT;
	121	return (NULL);
	122	}
	123	/* NOTREACHED */
0e076fb1	124	}
	125
	126	/* const char *
	127	* inet_ntop4(src, dst, size)
	128	* format an IPv4 address
	129	* return:
	130	* `dst' (as a const)
	131	* notes:
	132	* (1) uses no statics
	133	* (2) takes a u_char* not an in_addr as input
	134	* author:
	135	* Paul Vixie, 1996.
	136	*/
	137	static const char *
	138	inet_ntop4(src, dst, size)
26ac0430 AJ	139	const u_char *src;
	140	char *dst;
	141	size_t size;
0e076fb1	142	{
26ac0430 AJ	143	static const char fmt[] = "%u.%u.%u.%u";
26ac0430 AJ	144	char tmp[sizeof "255.255.255.255"];
0e076fb1	145
26ac0430 AJ	146	if (SPRINTF((tmp, fmt, src[0], src[1], src[2], src[3])) >= size) {
	147	errno = ENOSPC;
	148	return (NULL);
	149	}
	150	strcpy(dst, tmp);
	151	return (dst);
0e076fb1	152	}
	153
	154	/* const char *
	155	* inet_ntop6(src, dst, size)
	156	* convert IPv6 binary address into presentation (printable) format
	157	* author:
	158	* Paul Vixie, 1996.
	159	*/
	160	static const char *
	161	inet_ntop6(src, dst, size)
26ac0430 AJ	162	const u_char *src;
	163	char *dst;
	164	size_t size;
0e076fb1	165	{
26ac0430 AJ	166	/*
	167	* Note that int32_t and int16_t need only be "at least" large enough
	168	* to contain a value of the specified size. On some systems, like
	169	* Crays, there is no such thing as an integer variable with 16 bits.
	170	* Keep this in mind if you think this function should have been coded
	171	* to use pointer overlays. All the world's not a VAX.
	172	*/
	173	char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
	174	struct { int base, len; } best, cur;
	175	u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
	176	int i;
0e076fb1	177
26ac0430 AJ	178	/*
	179	* Preprocess:
	180	* Copy the input (bytewise) array into a wordwise array.
	181	* Find the longest run of 0x00's in src[] for :: shorthanding.
	182	*/
	183	memset(words, '\0', sizeof words);
	184	for (i = 0; i < NS_IN6ADDRSZ; i++)
	185	words[i / 2] \|= (src[i] << ((1 - (i % 2)) << 3));
	186	best.base = -1;
	187	best.len = 0;
	188	cur.base = -1;
	189	cur.len = 0;
	190	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
	191	if (words[i] == 0) {
	192	if (cur.base == -1)
	193	cur.base = i, cur.len = 1;
	194	else
	195	cur.len++;
	196	} else {
	197	if (cur.base != -1) {
	198	if (best.base == -1 \|\| cur.len > best.len)
	199	best = cur;
	200	cur.base = -1;
	201	}
	202	}
	203	}
	204	if (cur.base != -1) {
	205	if (best.base == -1 \|\| cur.len > best.len)
	206	best = cur;
	207	}
	208	if (best.base != -1 && best.len < 2)
	209	best.base = -1;
0e076fb1	210
26ac0430 AJ	211	/*
	212	* Format the result.
	213	*/
	214	tp = tmp;
	215	for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
	216	/* Are we inside the best run of 0x00's? */
	217	if (best.base != -1 && i >= best.base &&
	218	i < (best.base + best.len)) {
	219	if (i == best.base)
	220	*tp++ = ':';
	221	continue;
	222	}
	223	/* Are we following an initial run of 0x00s or any real hex? */
	224	if (i != 0)
	225	*tp++ = ':';
	226	/* Is this address an encapsulated IPv4? */
	227	if (i == 6 && best.base == 0 && (best.len == 6 \|\|
	228	(best.len == 7 && words[7] != 0x0001) \|\|
	229	(best.len == 5 && words[5] == 0xffff))) {
	230	if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp)))
	231	return (NULL);
	232	tp += strlen(tp);
	233	break;
	234	}
	235	tp += SPRINTF((tp, "%x", words[i]));
	236	}
	237	/* Was it a trailing run of 0x00's? */
	238	if (best.base != -1 && (best.base + best.len) ==
	239	(NS_IN6ADDRSZ / NS_INT16SZ))
	240	*tp++ = ':';
	241	*tp++ = '\0';
0e076fb1	242
26ac0430 AJ	243	/*
	244	* Check for overflow, copy, and we're done.
	245	*/
	246	if ((size_t)(tp - tmp) > size) {
	247	errno = ENOSPC;
	248	return (NULL);
	249	}
	250	strcpy(dst, tmp);
	251	return (dst);
0e076fb1	252	}
	253
	254	#endif /* HAVE_INET_NTOP */