source: UsbWattMeter/trunk/curl-7.47.1/lib/inet_pton.c

Last change on this file was 167, checked in by coas-nagasima, 6 years ago

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[164]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 */
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