aboutsummaryrefslogtreecommitdiff
path: root/lib/inet_pton.c
blob: d7fbbe9574f422b788e686f4ccb9623cba25d56f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/* This is from the BIND 4.9.4 release, modified to compile by itself */

/* Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include "setup.h"

#ifndef HAVE_INET_PTON

#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#include "inet_pton.h"

#define IN6ADDRSZ       16
#define INADDRSZ         4
#define INT16SZ          2

/*
 * WARNING: Don't even consider trying to compile this on a system where
 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
 */

static int      inet_pton4(const char *src, unsigned char *dst);
#ifdef ENABLE_IPV6
static int      inet_pton6(const char *src, unsigned char *dst);
#endif

/* int
 * inet_pton(af, src, dst)
 *      convert from presentation format (which usually means ASCII printable)
 *      to network format (which is usually some kind of binary format).
 * return:
 *      1 if the address was valid for the specified address family
 *      0 if the address wasn't valid (`dst' is untouched in this case)
 *      -1 if some other error occurred (`dst' is untouched in this case, too)
 * notice:
 *      On Windows we store the error in the thread errno, not
 *      in the winsock error code. This is to avoid losing the
 *      actual last winsock error. So use macro ERRNO to fetch the
 *      errno this function sets when returning (-1), not SOCKERRNO.
 * author:
 *      Paul Vixie, 1996.
 */
int
Curl_inet_pton(int af, const char *src, void *dst)
{
  switch (af) {
  case AF_INET:
    return (inet_pton4(src, (unsigned char *)dst));
#ifdef ENABLE_IPV6
  case AF_INET6:
    return (inet_pton6(src, (unsigned char *)dst));
#endif
  default:
    SET_ERRNO(EAFNOSUPPORT);
    return (-1);
  }
  /* NOTREACHED */
}

/* int
 * inet_pton4(src, dst)
 *      like inet_aton() but without all the hexadecimal and shorthand.
 * return:
 *      1 if `src' is a valid dotted quad, else 0.
 * notice:
 *      does not touch `dst' unless it's returning 1.
 * author:
 *      Paul Vixie, 1996.
 */
static int
inet_pton4(const char *src, unsigned char *dst)
{
  static const char digits[] = "0123456789";
  int saw_digit, octets, ch;
  unsigned char tmp[INADDRSZ], *tp;

  saw_digit = 0;
  octets = 0;
  tp = tmp;
  *tp = 0;
  while((ch = *src++) != '\0') {
    const char *pch;

    if((pch = strchr(digits, ch)) != NULL) {
      unsigned int val = *tp * 10 + (unsigned int)(pch - digits);

      if(saw_digit && *tp == 0)
        return (0);
      if(val > 255)
        return (0);
      *tp = (unsigned char)val;
      if(! saw_digit) {
        if(++octets > 4)
          return (0);
        saw_digit = 1;
      }
    }
    else if(ch == '.' && saw_digit) {
      if(octets == 4)
        return (0);
      *++tp = 0;
      saw_digit = 0;
    }
    else
      return (0);
  }
  if(octets < 4)
    return (0);
  memcpy(dst, tmp, INADDRSZ);
  return (1);
}

#ifdef ENABLE_IPV6
/* int
 * inet_pton6(src, dst)
 *      convert presentation level address to network order binary form.
 * return:
 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
 * notice:
 *      (1) does not touch `dst' unless it's returning 1.
 *      (2) :: in a full address is silently ignored.
 * credit:
 *      inspired by Mark Andrews.
 * author:
 *      Paul Vixie, 1996.
 */
static int
inet_pton6(const char *src, unsigned char *dst)
{
  static const char xdigits_l[] = "0123456789abcdef",
    xdigits_u[] = "0123456789ABCDEF";
  unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
  const char *xdigits, *curtok;
  int ch, saw_xdigit;
  size_t val;

  memset((tp = tmp), 0, IN6ADDRSZ);
  endp = tp + IN6ADDRSZ;
  colonp = NULL;
  /* Leading :: requires some special handling. */
  if(*src == ':')
    if(*++src != ':')
      return (0);
  curtok = src;
  saw_xdigit = 0;
  val = 0;
  while((ch = *src++) != '\0') {
    const char *pch;

    if((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
      pch = strchr((xdigits = xdigits_u), ch);
    if(pch != NULL) {
      val <<= 4;
      val |= (pch - xdigits);
      if(++saw_xdigit > 4)
        return (0);
      continue;
    }
    if(ch == ':') {
      curtok = src;
      if(!saw_xdigit) {
        if(colonp)
          return (0);
        colonp = tp;
        continue;
      }
      if(tp + INT16SZ > endp)
        return (0);
      *tp++ = (unsigned char) (val >> 8) & 0xff;
      *tp++ = (unsigned char) val & 0xff;
      saw_xdigit = 0;
      val = 0;
      continue;
    }
    if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
        inet_pton4(curtok, tp) > 0) {
      tp += INADDRSZ;
      saw_xdigit = 0;
      break;    /* '\0' was seen by inet_pton4(). */
    }
    return (0);
  }
  if(saw_xdigit) {
    if(tp + INT16SZ > endp)
      return (0);
    *tp++ = (unsigned char) (val >> 8) & 0xff;
    *tp++ = (unsigned char) val & 0xff;
  }
  if(colonp != NULL) {
    /*
     * Since some memmove()'s erroneously fail to handle
     * overlapping regions, we'll do the shift by hand.
     */
    const ssize_t n = tp - colonp;
    ssize_t i;

    if(tp == endp)
      return (0);
    for(i = 1; i <= n; i++) {
      *(endp - i) = *(colonp + n - i);
      *(colonp + n - i) = 0;
    }
    tp = endp;
  }
  if(tp != endp)
    return (0);
  memcpy(dst, tmp, IN6ADDRSZ);
  return (1);
}
#endif /* ENABLE_IPV6 */

#endif /* HAVE_INET_PTON */