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 USE_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(USE_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 = (unsigned int)(*tp * 10) +
116 (unsigned int)(pch - digits);
117
118 if(saw_digit && *tp == 0)
119 return (0);
120 if(val > 255)
121 return (0);
122 *tp = (unsigned char)val;
123 if(!saw_digit) {
124 if(++octets > 4)
125 return (0);
126 saw_digit = 1;
127 }
128 }
129 else if(ch == '.' && saw_digit) {
130 if(octets == 4)
131 return (0);
132 *++tp = 0;
133 saw_digit = 0;
134 }
135 else
136 return (0);
137 }
138 if(octets < 4)
139 return (0);
140 memcpy(dst, tmp, INADDRSZ);
141 return (1);
142 }
143
144 /* int
145 * inet_pton6(src, dst)
146 * convert presentation level address to network order binary form.
147 * return:
148 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
149 * notice:
150 * (1) does not touch `dst' unless it's returning 1.
151 * (2) :: in a full address is silently ignored.
152 * credit:
153 * inspired by Mark Andrews.
154 * author:
155 * Paul Vixie, 1996.
156 */
157 static int
inet_pton6(const char * src,unsigned char * dst)158 inet_pton6(const char *src, unsigned char *dst)
159 {
160 static const char xdigits_l[] = "0123456789abcdef",
161 xdigits_u[] = "0123456789ABCDEF";
162 unsigned char tmp[IN6ADDRSZ], *tp, *endp, *colonp;
163 const char *curtok;
164 int ch, saw_xdigit;
165 size_t val;
166
167 memset((tp = tmp), 0, IN6ADDRSZ);
168 endp = tp + IN6ADDRSZ;
169 colonp = NULL;
170 /* Leading :: requires some special handling. */
171 if(*src == ':')
172 if(*++src != ':')
173 return (0);
174 curtok = src;
175 saw_xdigit = 0;
176 val = 0;
177 while((ch = *src++) != '\0') {
178 const char *xdigits;
179 const char *pch;
180
181 pch = strchr((xdigits = xdigits_l), ch);
182 if(!pch)
183 pch = strchr((xdigits = xdigits_u), ch);
184 if(pch) {
185 val <<= 4;
186 val |= (pch - xdigits);
187 if(++saw_xdigit > 4)
188 return (0);
189 continue;
190 }
191 if(ch == ':') {
192 curtok = src;
193 if(!saw_xdigit) {
194 if(colonp)
195 return (0);
196 colonp = tp;
197 continue;
198 }
199 if(tp + INT16SZ > endp)
200 return (0);
201 *tp++ = (unsigned char) ((val >> 8) & 0xff);
202 *tp++ = (unsigned char) (val & 0xff);
203 saw_xdigit = 0;
204 val = 0;
205 continue;
206 }
207 if(ch == '.' && ((tp + INADDRSZ) <= endp) &&
208 inet_pton4(curtok, tp) > 0) {
209 tp += INADDRSZ;
210 saw_xdigit = 0;
211 break; /* '\0' was seen by inet_pton4(). */
212 }
213 return (0);
214 }
215 if(saw_xdigit) {
216 if(tp + INT16SZ > endp)
217 return (0);
218 *tp++ = (unsigned char) ((val >> 8) & 0xff);
219 *tp++ = (unsigned char) (val & 0xff);
220 }
221 if(colonp) {
222 /*
223 * Since some memmove()'s erroneously fail to handle
224 * overlapping regions, we'll do the shift by hand.
225 */
226 const ssize_t n = tp - colonp;
227 ssize_t i;
228
229 if(tp == endp)
230 return (0);
231 for(i = 1; i <= n; i++) {
232 *(endp - i) = *(colonp + n - i);
233 *(colonp + n - i) = 0;
234 }
235 tp = endp;
236 }
237 if(tp != endp)
238 return (0);
239 memcpy(dst, tmp, IN6ADDRSZ);
240 return (1);
241 }
242
243 #endif /* HAVE_INET_PTON */
244
