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 "curl_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_NETINET_IN_H
27#include <netinet/in.h>
28#endif
29#ifdef HAVE_ARPA_INET_H
30#include <arpa/inet.h>
31#endif
32
33#include "inet_pton.h"
34
35#define IN6ADDRSZ       16
36#define INADDRSZ         4
37#define INT16SZ          2
38
39/*
40 * WARNING: Don't even consider trying to compile this on a system where
41 * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
42 */
43
44static int      inet_pton4(const char *src, unsigned char *dst);
45#ifdef ENABLE_IPV6
46static int      inet_pton6(const char *src, unsigned char *dst);
47#endif
48
49/* int
50 * inet_pton(af, src, dst)
51 *      convert from presentation format (which usually means ASCII printable)
52 *      to network format (which is usually some kind of binary format).
53 * return:
54 *      1 if the address was valid for the specified address family
55 *      0 if the address wasn't valid (`dst' is untouched in this case)
56 *      -1 if some other error occurred (`dst' is untouched in this case, too)
57 * notice:
58 *      On Windows we store the error in the thread errno, not
59 *      in the winsock error code. This is to avoid losing the
60 *      actual last winsock error. So use macro ERRNO to fetch the
61 *      errno this function sets when returning (-1), not SOCKERRNO.
62 * author:
63 *      Paul Vixie, 1996.
64 */
65int
66Curl_inet_pton(int af, const char *src, void *dst)
67{
68  switch (af) {
69  case AF_INET:
70    return (inet_pton4(src, (unsigned char *)dst));
71#ifdef ENABLE_IPV6
72  case AF_INET6:
73    return (inet_pton6(src, (unsigned char *)dst));
74#endif
75  default:
76    SET_ERRNO(EAFNOSUPPORT);
77    return (-1);
78  }
79  /* NOTREACHED */
80}
81
82/* int
83 * inet_pton4(src, dst)
84 *      like inet_aton() but without all the hexadecimal and shorthand.
85 * return:
86 *      1 if `src' is a valid dotted quad, else 0.
87 * notice:
88 *      does not touch `dst' unless it's returning 1.
89 * author:
90 *      Paul Vixie, 1996.
91 */
92static int
93inet_pton4(const char *src, unsigned char *dst)
94{
95  static const char digits[] = "0123456789";
96  int saw_digit, octets, ch;
97  unsigned char tmp[INADDRSZ], *tp;
98
99  saw_digit = 0;
100  octets = 0;
101  tp = tmp;
102  *tp = 0;
103  while((ch = *src++) != '\0') {
104    const char *pch;
105
106    if((pch = strchr(digits, ch)) != NULL) {
107      unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
108
109      if(saw_digit && *tp == 0)
110        return (0);
111      if(val > 255)
112        return (0);
113      *tp = (unsigned char)val;
114      if(! saw_digit) {
115        if(++octets > 4)
116          return (0);
117        saw_digit = 1;
118      }
119    }
120    else if(ch == '.' && saw_digit) {
121      if(octets == 4)
122        return (0);
123      *++tp = 0;
124      saw_digit = 0;
125    }
126    else
127      return (0);
128  }
129  if(octets < 4)
130    return (0);
131  memcpy(dst, tmp, INADDRSZ);
132  return (1);
133}
134
135#ifdef ENABLE_IPV6
136/* int
137 * inet_pton6(src, dst)
138 *      convert presentation level address to network order binary form.
139 * return:
140 *      1 if `src' is a valid [RFC1884 2.2] address, else 0.
141 * notice:
142 *      (1) does not touch `dst' unless it's returning 1.
143 *      (2) :: in a full address is silently ignored.
144 * credit:
145 *      inspired by Mark Andrews.
146 * author:
147 *      Paul Vixie, 1996.
148 */
149static int
150inet_pton6(const char *src, unsigned char *dst)
151{
152  static const char xdigits_l[] = "0123456789abcdef",
153    xdigits_u[] = "0123456789ABCDEF";
154  unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
155  const char *xdigits, *curtok;
156  int ch, saw_xdigit;
157  size_t val;
158
159  memset((tp = tmp), 0, IN6ADDRSZ);
160  endp = tp + IN6ADDRSZ;
161  colonp = NULL;
162  /* Leading :: requires some special handling. */
163  if(*src == ':')
164    if(*++src != ':')
165      return (0);
166  curtok = src;
167  saw_xdigit = 0;
168  val = 0;
169  while((ch = *src++) != '\0') {
170    const char *pch;
171
172    if((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
173      pch = strchr((xdigits = xdigits_u), ch);
174    if(pch != NULL) {
175      val <<= 4;
176      val |= (pch - xdigits);
177      if(++saw_xdigit > 4)
178        return (0);
179      continue;
180    }
181    if(ch == ':') {
182      curtok = src;
183      if(!saw_xdigit) {
184        if(colonp)
185          return (0);
186        colonp = tp;
187        continue;
188      }
189      if(tp + INT16SZ > endp)
190        return (0);
191      *tp++ = (unsigned char) (val >> 8) & 0xff;
192      *tp++ = (unsigned char) val & 0xff;
193      saw_xdigit = 0;
194      val = 0;
195      continue;
196    }
197    if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
198        inet_pton4(curtok, tp) > 0) {
199      tp += INADDRSZ;
200      saw_xdigit = 0;
201      break;    /* '\0' was seen by inet_pton4(). */
202    }
203    return (0);
204  }
205  if(saw_xdigit) {
206    if(tp + INT16SZ > endp)
207      return (0);
208    *tp++ = (unsigned char) (val >> 8) & 0xff;
209    *tp++ = (unsigned char) val & 0xff;
210  }
211  if(colonp != NULL) {
212    /*
213     * Since some memmove()'s erroneously fail to handle
214     * overlapping regions, we'll do the shift by hand.
215     */
216    const ssize_t n = tp - colonp;
217    ssize_t i;
218
219    if(tp == endp)
220      return (0);
221    for(i = 1; i <= n; i++) {
222      *(endp - i) = *(colonp + n - i);
223      *(colonp + n - i) = 0;
224    }
225    tp = endp;
226  }
227  if(tp != endp)
228    return (0);
229  memcpy(dst, tmp, IN6ADDRSZ);
230  return (1);
231}
232#endif /* ENABLE_IPV6 */
233
234#endif /* HAVE_INET_PTON */
235