1/* -*- buffer-read-only: t -*- vi: set ro: */
2/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3#line 1
4/* inet_ntop.c -- convert IPv4 and IPv6 addresses from binary to text form
5
6   Copyright (C) 2005-2006, 2008-2010 Free Software Foundation, Inc.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3, or (at your option)
11   any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software Foundation,
20   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
21
22/*
23 * Copyright (c) 1996-1999 by Internet Software Consortium.
24 *
25 * Permission to use, copy, modify, and distribute this software for any
26 * purpose with or without fee is hereby granted, provided that the above
27 * copyright notice and this permission notice appear in all copies.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
30 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
31 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
32 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
33 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
34 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
35 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
36 * SOFTWARE.
37 */
38
39#include <config.h>
40
41/* Specification.  */
42#include <arpa/inet.h>
43
44#include <stdio.h>
45#include <string.h>
46#include <errno.h>
47
48#define NS_IN6ADDRSZ 16
49#define NS_INT16SZ 2
50
51/*
52 * WARNING: Don't even consider trying to compile this on a system where
53 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
54 */
55typedef int verify_int_size[2 * sizeof (int) - 7];
56
57static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size);
58#if HAVE_IPV6
59static const char *inet_ntop6 (const unsigned char *src, char *dst, socklen_t size);
60#endif
61
62
63/* char *
64 * inet_ntop(af, src, dst, size)
65 *      convert a network format address to presentation format.
66 * return:
67 *      pointer to presentation format address (`dst'), or NULL (see errno).
68 * author:
69 *      Paul Vixie, 1996.
70 */
71const char *
72inet_ntop (int af, const void *restrict src,
73           char *restrict dst, socklen_t cnt)
74{
75  switch (af)
76    {
77#if HAVE_IPV4
78    case AF_INET:
79      return (inet_ntop4 (src, dst, cnt));
80#endif
81
82#if HAVE_IPV6
83    case AF_INET6:
84      return (inet_ntop6 (src, dst, cnt));
85#endif
86
87    default:
88      errno = EAFNOSUPPORT;
89      return (NULL);
90    }
91  /* NOTREACHED */
92}
93
94/* const char *
95 * inet_ntop4(src, dst, size)
96 *      format an IPv4 address
97 * return:
98 *      `dst' (as a const)
99 * notes:
100 *      (1) uses no statics
101 *      (2) takes a u_char* not an in_addr as input
102 * author:
103 *      Paul Vixie, 1996.
104 */
105static const char *
106inet_ntop4 (const unsigned char *src, char *dst, socklen_t size)
107{
108  char tmp[sizeof "255.255.255.255"];
109  int len;
110
111  len = sprintf (tmp, "%u.%u.%u.%u", src[0], src[1], src[2], src[3]);
112  if (len < 0)
113    return NULL;
114
115  if (len > size)
116    {
117      errno = ENOSPC;
118      return NULL;
119    }
120
121  return strcpy (dst, tmp);
122}
123
124#if HAVE_IPV6
125
126/* const char *
127 * inet_ntop6(src, dst, size)
128 *      convert IPv6 binary address into presentation (printable) format
129 * author:
130 *      Paul Vixie, 1996.
131 */
132static const char *
133inet_ntop6 (const unsigned char *src, char *dst, socklen_t size)
134{
135  /*
136   * Note that int32_t and int16_t need only be "at least" large enough
137   * to contain a value of the specified size.  On some systems, like
138   * Crays, there is no such thing as an integer variable with 16 bits.
139   * Keep this in mind if you think this function should have been coded
140   * to use pointer overlays.  All the world's not a VAX.
141   */
142  char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
143  struct
144  {
145    int base, len;
146  } best, cur;
147  unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
148  int i;
149
150  /*
151   * Preprocess:
152   *      Copy the input (bytewise) array into a wordwise array.
153   *      Find the longest run of 0x00's in src[] for :: shorthanding.
154   */
155  memset (words, '\0', sizeof words);
156  for (i = 0; i < NS_IN6ADDRSZ; i += 2)
157    words[i / 2] = (src[i] << 8) | src[i + 1];
158  best.base = -1;
159  cur.base = -1;
160  for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
161    {
162      if (words[i] == 0)
163        {
164          if (cur.base == -1)
165            cur.base = i, cur.len = 1;
166          else
167            cur.len++;
168        }
169      else
170        {
171          if (cur.base != -1)
172            {
173              if (best.base == -1 || cur.len > best.len)
174                best = cur;
175              cur.base = -1;
176            }
177        }
178    }
179  if (cur.base != -1)
180    {
181      if (best.base == -1 || cur.len > best.len)
182        best = cur;
183    }
184  if (best.base != -1 && best.len < 2)
185    best.base = -1;
186
187  /*
188   * Format the result.
189   */
190  tp = tmp;
191  for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
192    {
193      /* Are we inside the best run of 0x00's? */
194      if (best.base != -1 && i >= best.base && i < (best.base + best.len))
195        {
196          if (i == best.base)
197            *tp++ = ':';
198          continue;
199        }
200      /* Are we following an initial run of 0x00s or any real hex? */
201      if (i != 0)
202        *tp++ = ':';
203      /* Is this address an encapsulated IPv4? */
204      if (i == 6 && best.base == 0 &&
205          (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
206        {
207          if (!inet_ntop4 (src + 12, tp, sizeof tmp - (tp - tmp)))
208            return (NULL);
209          tp += strlen (tp);
210          break;
211        }
212      {
213        int len = sprintf (tp, "%x", words[i]);
214        if (len < 0)
215          return NULL;
216        tp += len;
217      }
218    }
219  /* Was it a trailing run of 0x00's? */
220  if (best.base != -1 && (best.base + best.len) ==
221      (NS_IN6ADDRSZ / NS_INT16SZ))
222    *tp++ = ':';
223  *tp++ = '\0';
224
225  /*
226   * Check for overflow, copy, and we're done.
227   */
228  if ((socklen_t) (tp - tmp) > size)
229    {
230      errno = ENOSPC;
231      return NULL;
232    }
233
234  return strcpy (dst, tmp);
235}
236
237#endif
238