1 /* This is from the BIND 4.9.4 release, modified to compile by itself */
2
3 /* Copyright (c) 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 * If ENABLE_IPV6 is disabled, we still want to parse IPv6 addresses, so make
43 * sure we have _some_ value for AF_INET6 without polluting our fake value
44 * everywhere.
45 */
46 #if !defined(ENABLE_IPV6) && !defined(AF_INET6)
47 #define AF_INET6 (AF_INET + 1)
48 #endif
49
50 /*
51 * WARNING: Don't even consider trying to compile this on a system where
52 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
53 */
54
55 static int inet_pton4(const char *src, unsigned char *dst);
56 static int inet_pton6(const char *src, unsigned char *dst);
57
58 /* int
59 * inet_pton(af, src, dst)
60 * convert from presentation format (which usually means ASCII printable)
61 * to network format (which is usually some kind of binary format).
62 * return:
63 * 1 if the address was valid for the specified address family
64 * 0 if the address wasn't valid (`dst' is untouched in this case)
65 * -1 if some other error occurred (`dst' is untouched in this case, too)
66 * notice:
67 * On Windows we store the error in the thread errno, not
68 * in the winsock error code. This is to avoid losing the
69 * actual last winsock error. So when this function returns
70 * -1, check errno not SOCKERRNO.
71 * author:
72 * Paul Vixie, 1996.
73 */
74 int
Curl_inet_pton(int af,const char * src,void * dst)75 Curl_inet_pton(int af, const char *src, void *dst)
76 {
77 switch(af) {
78 case AF_INET:
79 return (inet_pton4(src, (unsigned char *)dst));
80 case AF_INET6:
81 return (inet_pton6(src, (unsigned char *)dst));
82 default:
83 errno = EAFNOSUPPORT;
84 return (-1);
85 }
86 /* NOTREACHED */
87 }
88
89 /* int
90 * inet_pton4(src, dst)
91 * like inet_aton() but without all the hexadecimal and shorthand.
92 * return:
93 * 1 if `src' is a valid dotted quad, else 0.
94 * notice:
95 * does not touch `dst' unless it's returning 1.
96 * author:
97 * Paul Vixie, 1996.
98 */
99 static int
inet_pton4(const char * src,unsigned char * dst)100 inet_pton4(const char *src, unsigned char *dst)
101 {
102 static const char digits[] = "0123456789";
103 int saw_digit, octets, ch;
104 unsigned char tmp[INADDRSZ], *tp;
105
106 saw_digit = 0;
107 octets = 0;
108 tp = tmp;
109 *tp = 0;
110 while((ch = *src++) != '\0') {
111 const char *pch;
112
113 pch = strchr(digits, ch);
114 if(pch) {
115 unsigned int val = *tp * 10 + (unsigned int)(pch - digits);
116
117 if(saw_digit && *tp == 0)
118 return (0);
119 if(val > 255)
120 return (0);
121 *tp = (unsigned char)val;
122 if(!saw_digit) {
123 if(++octets > 4)
124 return (0);
125 saw_digit = 1;
126 }
127 }
128 else if(ch == '.' && saw_digit) {
129 if(octets == 4)
130 return (0);
131 *++tp = 0;
132 saw_digit = 0;
133 }
134 else
135 return (0);
136 }
137 if(octets < 4)
138 return (0);
139 memcpy(dst, tmp, INADDRSZ);
140 return (1);
141 }
142
143 /* int
144 * inet_pton6(src, dst)
145 * convert presentation level address to network order binary form.
146 * return:
147 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
148 * notice:
149 * (1) does not touch `dst' unless it's returning 1.
150 * (2) :: in a full address is silently ignored.
151 * credit:
152 * inspired by Mark Andrews.
153 * author:
154 * Paul Vixie, 1996.
155 */
156 static int
inet_pton6(const char * src,unsigned char * dst)157 inet_pton6(const char *src, unsigned char *dst)
158 {
159 static const char xdigits_l[] = "0123456789abcdef",
160 xdigits_u[] = "0123456789ABCDEF";
161 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
162 const char *curtok;
163 int ch, saw_xdigit;
164 size_t val;
165
166 memset((tp = tmp), 0, IN6ADDRSZ);
167 endp = tp + IN6ADDRSZ;
168 colonp = NULL;
169 /* Leading :: requires some special handling. */
170 if(*src == ':')
171 if(*++src != ':')
172 return (0);
173 curtok = src;
174 saw_xdigit = 0;
175 val = 0;
176 while((ch = *src++) != '\0') {
177 const char *xdigits;
178 const char *pch;
179
180 pch = strchr((xdigits = xdigits_l), ch);
181 if(!pch)
182 pch = strchr((xdigits = xdigits_u), ch);
183 if(pch) {
184 val <<= 4;
185 val |= (pch - xdigits);
186 if(++saw_xdigit > 4)
187 return (0);
188 continue;
189 }
190 if(ch == ':') {
191 curtok = src;
192 if(!saw_xdigit) {
193 if(colonp)
194 return (0);
195 colonp = tp;
196 continue;
197 }
198 if(tp + INT16SZ > endp)
199 return (0);
200 *tp++ = (unsigned char) ((val >> 8) & 0xff);
201 *tp++ = (unsigned char) (val & 0xff);
202 saw_xdigit = 0;
203 val = 0;
204 continue;
205 }
206 if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
207 inet_pton4(curtok, tp) > 0) {
208 tp += INADDRSZ;
209 saw_xdigit = 0;
210 break; /* '\0' was seen by inet_pton4(). */
211 }
212 return (0);
213 }
214 if(saw_xdigit) {
215 if(tp + INT16SZ > endp)
216 return (0);
217 *tp++ = (unsigned char) ((val >> 8) & 0xff);
218 *tp++ = (unsigned char) (val & 0xff);
219 }
220 if(colonp) {
221 /*
222 * Since some memmove()'s erroneously fail to handle
223 * overlapping regions, we'll do the shift by hand.
224 */
225 const ssize_t n = tp - colonp;
226 ssize_t i;
227
228 if(tp == endp)
229 return (0);
230 for(i = 1; i <= n; i++) {
231 *(endp - i) = *(colonp + n - i);
232 *(colonp + n - i) = 0;
233 }
234 tp = endp;
235 }
236 if(tp != endp)
237 return (0);
238 memcpy(dst, tmp, IN6ADDRSZ);
239 return (1);
240 }
241
242 #endif /* HAVE_INET_PTON */
243