1/*
2 * Copyright (c) 1999 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *      This product includes software developed by the Kungliga Tekniska
20 *      H�gskolan and its contributors.
21 *
22 * 4. Neither the name of the Institute nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39/* $Id: inet_ntop.c,v 1.7 2003/11/16 09:36:50 guy Exp $ */
40
41#ifndef lint
42static const char rcsid[] =
43     "@(#) $Header: /tcpdump/master/tcpdump/missing/inet_ntop.c,v 1.7 2003/11/16 09:36:50 guy Exp $";
44#endif
45
46/* we aren't tcpdump :) */
47#ifdef notdef
48#include <tcpdump-stdinc.h>
49#endif
50
51#include <stdio.h>
52#include <sys/types.h>
53
54#ifndef WIN32
55#include <errno.h>
56#include <sys/socket.h>
57#include <netinet/in.h>
58
59#else   /* WIN32 */
60#include <time.h>
61#include <winsock2.h>
62#ifdef DO_IPV6
63#include <ws2tcpip.h>
64#endif  /* DO_IPV6 */
65#include <windows.h>
66
67/* The below are copied from netlib.h */
68#ifdef errno
69/* delete the one from stdlib.h  */
70/*#define errno       (*_errno()) */
71#undef errno
72#endif
73#define errno GetLastError()
74#define Set_errno(num) SetLastError((num))
75
76/* INVALID_SOCKET == INVALID_HANDLE_VALUE == (unsigned int)(~0) */
77/* SOCKET_ERROR == -1 */
78#define ENOTSOCK WSAENOTSOCK
79#define EINTR    WSAEINTR
80#define ENOBUFS  WSAENOBUFS
81#define EWOULDBLOCK           WSAEWOULDBLOCK
82#define EAFNOSUPPORT  WSAEAFNOSUPPORT
83/* from public\sdk\inc\crt\errno.h */
84#define ENOSPC          28
85#endif  /* WIN32 */
86
87/*
88 *
89 */
90
91#ifndef INET_ADDRSTRLEN
92#define INET_ADDRSTRLEN    16
93#endif
94
95static const char *
96inet_ntop_v4 (const void *src, char *dst, size_t size)
97{
98    const char digits[] = "0123456789";
99    int i;
100    struct in_addr *addr = (struct in_addr *)src;
101    u_long a = ntohl(addr->s_addr);
102    const char *orig_dst = dst;
103
104    if (size < INET_ADDRSTRLEN) {
105      Set_errno(ENOSPC);
106      return NULL;
107    }
108    for (i = 0; i < 4; ++i) {
109	int n = (a >> (24 - i * 8)) & 0xFF;
110	int non_zerop = 0;
111
112	if (non_zerop || n / 100 > 0) {
113	    *dst++ = digits[n / 100];
114	    n %= 100;
115	    non_zerop = 1;
116	}
117	if (non_zerop || n / 10 > 0) {
118	    *dst++ = digits[n / 10];
119	    n %= 10;
120	    non_zerop = 1;
121	}
122	*dst++ = digits[n];
123	if (i != 3)
124	    *dst++ = '.';
125    }
126    *dst++ = '\0';
127    return orig_dst;
128}
129
130const char *
131inet_ntop(int af, const void *src, char *dst, size_t size)
132{
133    switch (af) {
134    case AF_INET :
135	return inet_ntop_v4 (src, dst, size);
136    default :
137      Set_errno(EAFNOSUPPORT);
138      return NULL;
139    }
140}
141