1/* This is from the BIND 4.9.4 release, modified to compile by itself */
2
3/* Copyright (c) 1996 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16 * SOFTWARE.
17 */
18
19#include "setup.h"
20
21#ifndef HAVE_INET_PTON
22
23#ifdef HAVE_SYS_PARAM_H
24#include <sys/param.h>
25#endif
26#ifdef HAVE_SYS_SOCKET_H
27#include <sys/socket.h>
28#endif
29#ifdef HAVE_NETINET_IN_H
30#include <netinet/in.h>
31#endif
32#ifdef HAVE_ARPA_INET_H
33#include <arpa/inet.h>
34#endif
35#include <string.h>
36#include <errno.h>
37
38#include "inet_pton.h"
39
40#define IN6ADDRSZ       16
41#define INADDRSZ         4
42#define INT16SZ          2
43
44/*
45 * WARNING: Don't even consider trying to compile this on a system where
46 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
47 */
48
49static int      inet_pton4(const char *src, unsigned char *dst);
50#ifdef ENABLE_IPV6
51static int      inet_pton6(const char *src, unsigned char *dst);
52#endif
53
54/* int
55 * inet_pton(af, src, dst)
56 *      convert from presentation format (which usually means ASCII printable)
57 *      to network format (which is usually some kind of binary format).
58 * return:
59 *      1 if the address was valid for the specified address family
60 *      0 if the address wasn't valid (`dst' is untouched in this case)
61 *      -1 if some other error occurred (`dst' is untouched in this case, too)
62 * notice:
63 *      On Windows we store the error in the thread errno, not
64 *      in the winsock error code. This is to avoid losing the
65 *      actual last winsock error. So use macro ERRNO to fetch the
66 *      errno this function sets when returning (-1), not SOCKERRNO.
67 * author:
68 *      Paul Vixie, 1996.
69 */
70int
71Curl_inet_pton(int af, const char *src, void *dst)
72{
73  switch (af) {
74  case AF_INET:
75    return (inet_pton4(src, (unsigned char *)dst));
76#ifdef ENABLE_IPV6
77  case AF_INET6:
78    return (inet_pton6(src, (unsigned char *)dst));
79#endif
80  default:
81    SET_ERRNO(EAFNOSUPPORT);
82    return (-1);
83  }
84  /* NOTREACHED */
85}
86
87/* int
88 * inet_pton4(src, dst)
89 *      like inet_aton() but without all the hexadecimal and shorthand.
90 * return:
91 *      1 if `src' is a valid dotted quad, else 0.
92 * notice:
93 *      does not touch `dst' unless it's returning 1.
94 * author:
95 *      Paul Vixie, 1996.
96 */
97static int
98inet_pton4(const char *src, unsigned char *dst)
99{
100  static const char digits[] = "0123456789";
101  int saw_digit, octets, ch;
102  unsigned char tmp[INADDRSZ], *tp;
103
104  saw_digit = 0;
105  octets = 0;
106  tp = tmp;
107  *tp = 0;
108  while((ch = *src++) != '\0') {
109    const char *pch;
110
111    if((pch = strchr(digits, ch)) != NULL) {
112      unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
113
114      if(saw_digit && *tp == 0)
115        return (0);
116      if(val > 255)
117        return (0);
118      *tp = (unsigned char)val;
119      if(! saw_digit) {
120        if(++octets > 4)
121          return (0);
122        saw_digit = 1;
123      }
124    }
125    else if(ch == '.' && saw_digit) {
126      if(octets == 4)
127        return (0);
128      *++tp = 0;
129      saw_digit = 0;
130    }
131    else
132      return (0);
133  }
134  if(octets < 4)
135    return (0);
136  memcpy(dst, tmp, INADDRSZ);
137  return (1);
138}
139
140#ifdef ENABLE_IPV6
141/* int
142 * inet_pton6(src, dst)
143 *      convert presentation level address to network order binary form.
144 * return:
145 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
146 * notice:
147 *      (1) does not touch `dst' unless it's returning 1.
148 *      (2) :: in a full address is silently ignored.
149 * credit:
150 *      inspired by Mark Andrews.
151 * author:
152 *      Paul Vixie, 1996.
153 */
154static int
155inet_pton6(const char *src, unsigned char *dst)
156{
157  static const char xdigits_l[] = "0123456789abcdef",
158    xdigits_u[] = "0123456789ABCDEF";
159  unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
160  const char *xdigits, *curtok;
161  int ch, saw_xdigit;
162  size_t val;
163
164  memset((tp = tmp), 0, IN6ADDRSZ);
165  endp = tp + IN6ADDRSZ;
166  colonp = NULL;
167  /* Leading :: requires some special handling. */
168  if(*src == ':')
169    if(*++src != ':')
170      return (0);
171  curtok = src;
172  saw_xdigit = 0;
173  val = 0;
174  while((ch = *src++) != '\0') {
175    const char *pch;
176
177    if((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
178      pch = strchr((xdigits = xdigits_u), ch);
179    if(pch != NULL) {
180      val <<= 4;
181      val |= (pch - xdigits);
182      if(++saw_xdigit > 4)
183        return (0);
184      continue;
185    }
186    if(ch == ':') {
187      curtok = src;
188      if(!saw_xdigit) {
189        if(colonp)
190          return (0);
191        colonp = tp;
192        continue;
193      }
194      if(tp + INT16SZ > endp)
195        return (0);
196      *tp++ = (unsigned char) (val >> 8) & 0xff;
197      *tp++ = (unsigned char) val & 0xff;
198      saw_xdigit = 0;
199      val = 0;
200      continue;
201    }
202    if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
203        inet_pton4(curtok, tp) > 0) {
204      tp += INADDRSZ;
205      saw_xdigit = 0;
206      break;    /* '\0' was seen by inet_pton4(). */
207    }
208    return (0);
209  }
210  if(saw_xdigit) {
211    if(tp + INT16SZ > endp)
212      return (0);
213    *tp++ = (unsigned char) (val >> 8) & 0xff;
214    *tp++ = (unsigned char) val & 0xff;
215  }
216  if(colonp != NULL) {
217    /*
218     * Since some memmove()'s erroneously fail to handle
219     * overlapping regions, we'll do the shift by hand.
220     */
221    const ssize_t n = tp - colonp;
222    ssize_t i;
223
224    if(tp == endp)
225      return (0);
226    for(i = 1; i <= n; i++) {
227      *(endp - i) = *(colonp + n - i);
228      *(colonp + n - i) = 0;
229    }
230    tp = endp;
231  }
232  if(tp != endp)
233    return (0);
234  memcpy(dst, tmp, IN6ADDRSZ);
235  return (1);
236}
237#endif /* ENABLE_IPV6 */
238
239#endif /* HAVE_INET_PTON */
240