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