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
42 static 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
95 static const char *
inet_ntop_v4(const void * src,char * dst,size_t size)96 inet_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
130 const char *
inet_ntop(int af,const void * src,char * dst,size_t size)131 inet_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