155682Smarkm/*
2233294Sstas * Copyright (c) 1999 - 2001 Kungliga Tekniska H��gskolan
355682Smarkm * (Royal Institute of Technology, Stockholm, Sweden).
455682Smarkm * All rights reserved.
5233294Sstas *
655682Smarkm * Redistribution and use in source and binary forms, with or without
755682Smarkm * modification, are permitted provided that the following conditions
855682Smarkm * are met:
9233294Sstas *
1055682Smarkm * 1. Redistributions of source code must retain the above copyright
1155682Smarkm *    notice, this list of conditions and the following disclaimer.
12233294Sstas *
1355682Smarkm * 2. Redistributions in binary form must reproduce the above copyright
1455682Smarkm *    notice, this list of conditions and the following disclaimer in the
1555682Smarkm *    documentation and/or other materials provided with the distribution.
16233294Sstas *
1755682Smarkm * 3. Neither the name of the Institute nor the names of its contributors
1855682Smarkm *    may be used to endorse or promote products derived from this software
1955682Smarkm *    without specific prior written permission.
20233294Sstas *
2155682Smarkm * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
2255682Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2355682Smarkm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2455682Smarkm * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
2555682Smarkm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2655682Smarkm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2755682Smarkm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2855682Smarkm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2955682Smarkm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
3055682Smarkm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3155682Smarkm * SUCH DAMAGE.
3255682Smarkm */
3355682Smarkm
3455682Smarkm#include <config.h>
3555682Smarkm
36178825Sdfr#include "roken.h"
3755682Smarkm
3855682Smarkm/*
3955682Smarkm *
4055682Smarkm */
4155682Smarkm
4255682Smarkmstatic const char *
4355682Smarkminet_ntop_v4 (const void *src, char *dst, size_t size)
4455682Smarkm{
4555682Smarkm    const char digits[] = "0123456789";
4655682Smarkm    int i;
4755682Smarkm    struct in_addr *addr = (struct in_addr *)src;
4855682Smarkm    u_long a = ntohl(addr->s_addr);
4955682Smarkm    const char *orig_dst = dst;
5055682Smarkm
5155682Smarkm    if (size < INET_ADDRSTRLEN) {
5255682Smarkm	errno = ENOSPC;
5355682Smarkm	return NULL;
5455682Smarkm    }
5555682Smarkm    for (i = 0; i < 4; ++i) {
5655682Smarkm	int n = (a >> (24 - i * 8)) & 0xFF;
5755682Smarkm	int non_zerop = 0;
5855682Smarkm
5955682Smarkm	if (non_zerop || n / 100 > 0) {
6055682Smarkm	    *dst++ = digits[n / 100];
6155682Smarkm	    n %= 100;
6255682Smarkm	    non_zerop = 1;
6355682Smarkm	}
6455682Smarkm	if (non_zerop || n / 10 > 0) {
6555682Smarkm	    *dst++ = digits[n / 10];
6655682Smarkm	    n %= 10;
6755682Smarkm	    non_zerop = 1;
6855682Smarkm	}
6955682Smarkm	*dst++ = digits[n];
7055682Smarkm	if (i != 3)
7155682Smarkm	    *dst++ = '.';
7255682Smarkm    }
7355682Smarkm    *dst++ = '\0';
7455682Smarkm    return orig_dst;
7555682Smarkm}
7655682Smarkm
7755682Smarkm#ifdef HAVE_IPV6
7855682Smarkmstatic const char *
7955682Smarkminet_ntop_v6 (const void *src, char *dst, size_t size)
8055682Smarkm{
8155682Smarkm    const char xdigits[] = "0123456789abcdef";
8255682Smarkm    int i;
8355682Smarkm    const struct in6_addr *addr = (struct in6_addr *)src;
8455682Smarkm    const u_char *ptr = addr->s6_addr;
8555682Smarkm    const char *orig_dst = dst;
86233294Sstas    int compressed = 0;
8755682Smarkm
8855682Smarkm    if (size < INET6_ADDRSTRLEN) {
8955682Smarkm	errno = ENOSPC;
9055682Smarkm	return NULL;
9155682Smarkm    }
9255682Smarkm    for (i = 0; i < 8; ++i) {
9378527Sassar	int non_zerop = 0;
9455682Smarkm
95233294Sstas        if (compressed == 0 &&
96233294Sstas            ptr[0] == 0 && ptr[1] == 0 &&
97233294Sstas            i <= 5 &&
98233294Sstas            ptr[2] == 0 && ptr[3] == 0 &&
99233294Sstas            ptr[4] == 0 && ptr[5] == 0) {
100233294Sstas
101233294Sstas            compressed = 1;
102233294Sstas
103233294Sstas            if (i == 0)
104233294Sstas                *dst++ = ':';
105233294Sstas            *dst++ = ':';
106233294Sstas
107233294Sstas            for (ptr += 6, i += 3;
108233294Sstas                 i < 8 && ptr[0] == 0 && ptr[1] == 0;
109233294Sstas                 ++i, ptr += 2);
110233294Sstas
111233294Sstas            if (i >= 8)
112233294Sstas                break;
113233294Sstas        }
114233294Sstas
11555682Smarkm	if (non_zerop || (ptr[0] >> 4)) {
11655682Smarkm	    *dst++ = xdigits[ptr[0] >> 4];
11755682Smarkm	    non_zerop = 1;
11855682Smarkm	}
11955682Smarkm	if (non_zerop || (ptr[0] & 0x0F)) {
12055682Smarkm	    *dst++ = xdigits[ptr[0] & 0x0F];
12155682Smarkm	    non_zerop = 1;
12255682Smarkm	}
12355682Smarkm	if (non_zerop || (ptr[1] >> 4)) {
12455682Smarkm	    *dst++ = xdigits[ptr[1] >> 4];
12555682Smarkm	    non_zerop = 1;
12655682Smarkm	}
12778527Sassar	*dst++ = xdigits[ptr[1] & 0x0F];
12855682Smarkm	if (i != 7)
12955682Smarkm	    *dst++ = ':';
13055682Smarkm	ptr += 2;
13155682Smarkm    }
13255682Smarkm    *dst++ = '\0';
13355682Smarkm    return orig_dst;
13455682Smarkm}
13555682Smarkm#endif /* HAVE_IPV6 */
13655682Smarkm
137233294SstasROKEN_LIB_FUNCTION const char * ROKEN_LIB_CALL
13855682Smarkminet_ntop(int af, const void *src, char *dst, size_t size)
13955682Smarkm{
14055682Smarkm    switch (af) {
14155682Smarkm    case AF_INET :
14255682Smarkm	return inet_ntop_v4 (src, dst, size);
14355682Smarkm#ifdef HAVE_IPV6
14455682Smarkm    case AF_INET6 :
14555682Smarkm	return inet_ntop_v6 (src, dst, size);
14655682Smarkm#endif
14755682Smarkm    default :
14855682Smarkm	errno = EAFNOSUPPORT;
14955682Smarkm	return NULL;
15055682Smarkm    }
15155682Smarkm}
152