1/* This is from the BIND 4.9.4 release, modified to compile by itself */
2
3/* Copyright (c) 2003 - 2022 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 * SPDX-License-Identifier: ISC
19 */
20
21#include "curl_setup.h"
22
23#ifndef HAVE_INET_PTON
24
25#ifdef HAVE_SYS_PARAM_H
26#include <sys/param.h>
27#endif
28#ifdef HAVE_NETINET_IN_H
29#include <netinet/in.h>
30#endif
31#ifdef HAVE_ARPA_INET_H
32#include <arpa/inet.h>
33#endif
34
35#include "inet_pton.h"
36
37#define IN6ADDRSZ 16
38#define INADDRSZ 4
39#define INT16SZ 2
40
41/*
42 * WARNING: Don't even consider trying to compile this on a system where
43 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
44 */
45
46static int inet_pton4(const char *src, unsigned char *dst);
47#ifdef ENABLE_IPV6
48static int inet_pton6(const char *src, unsigned char *dst);
49#endif
50
51/* int
52 * inet_pton(af, src, dst)
53 * convert from presentation format (which usually means ASCII printable)
54 * to network format (which is usually some kind of binary format).
55 * return:
56 * 1 if the address was valid for the specified address family
57 * 0 if the address wasn't valid (`dst' is untouched in this case)
58 * -1 if some other error occurred (`dst' is untouched in this case, too)
59 * notice:
60 * On Windows we store the error in the thread errno, not
61 * in the winsock error code. This is to avoid losing the
62 * actual last winsock error. So when this function returns
63 * -1, check errno not SOCKERRNO.
64 * author:
65 * Paul Vixie, 1996.
66 */
67int
68Curl_inet_pton(int af, const char *src, void *dst)
69{
70 switch(af) {
71 case AF_INET:
72 return (inet_pton4(src, (unsigned char *)dst));
73#ifdef ENABLE_IPV6
74 case AF_INET6:
75 return (inet_pton6(src, (unsigned char *)dst));
76#endif
77 default:
78 errno = EAFNOSUPPORT;
79 return (-1);
80 }
81 /* NOTREACHED */
82}
83
84/* int
85 * inet_pton4(src, dst)
86 * like inet_aton() but without all the hexadecimal and shorthand.
87 * return:
88 * 1 if `src' is a valid dotted quad, else 0.
89 * notice:
90 * does not touch `dst' unless it's returning 1.
91 * author:
92 * Paul Vixie, 1996.
93 */
94static int
95inet_pton4(const char *src, unsigned char *dst)
96{
97 static const char digits[] = "0123456789";
98 int saw_digit, octets, ch;
99 unsigned char tmp[INADDRSZ], *tp;
100
101 saw_digit = 0;
102 octets = 0;
103 tp = tmp;
104 *tp = 0;
105 while((ch = *src++) != '\0') {
106 const char *pch;
107
108 pch = strchr(digits, ch);
109 if(pch) {
110 unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
111
112 if(saw_digit && *tp == 0)
113 return (0);
114 if(val > 255)
115 return (0);
116 *tp = (unsigned char)val;
117 if(!saw_digit) {
118 if(++octets > 4)
119 return (0);
120 saw_digit = 1;
121 }
122 }
123 else if(ch == '.' && saw_digit) {
124 if(octets == 4)
125 return (0);
126 *++tp = 0;
127 saw_digit = 0;
128 }
129 else
130 return (0);
131 }
132 if(octets < 4)
133 return (0);
134 memcpy(dst, tmp, INADDRSZ);
135 return (1);
136}
137
138#ifdef ENABLE_IPV6
139/* int
140 * inet_pton6(src, dst)
141 * convert presentation level address to network order binary form.
142 * return:
143 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
144 * notice:
145 * (1) does not touch `dst' unless it's returning 1.
146 * (2) :: in a full address is silently ignored.
147 * credit:
148 * inspired by Mark Andrews.
149 * author:
150 * Paul Vixie, 1996.
151 */
152static int
153inet_pton6(const char *src, unsigned char *dst)
154{
155 static const char xdigits_l[] = "0123456789abcdef",
156 xdigits_u[] = "0123456789ABCDEF";
157 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
158 const char *curtok;
159 int ch, saw_xdigit;
160 size_t val;
161
162 memset((tp = tmp), 0, IN6ADDRSZ);
163 endp = tp + IN6ADDRSZ;
164 colonp = NULL;
165 /* Leading :: requires some special handling. */
166 if(*src == ':')
167 if(*++src != ':')
168 return (0);
169 curtok = src;
170 saw_xdigit = 0;
171 val = 0;
172 while((ch = *src++) != '\0') {
173 const char *xdigits;
174 const char *pch;
175
176 pch = strchr((xdigits = xdigits_l), ch);
177 if(!pch)
178 pch = strchr((xdigits = xdigits_u), ch);
179 if(pch) {
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) {
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