1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$Id: inet_pton.c,v 1.3.18.2 2005/07/28 07:38:07 marka Exp $";
20#endif /* LIBC_SCCS and not lint */
21#include <sys/cdefs.h>
22__FBSDID("$FreeBSD: head/lib/libc/inet/inet_pton.c 170244 2007-06-03 17:20:27Z ume $");
23
24#include "port_before.h"
25#include <sys/param.h>
26#include <sys/types.h>
27#include <sys/socket.h>
28#include <netinet/in.h>
29#include <arpa/inet.h>
30#include <arpa/nameser.h>
31#include <string.h>
32#include <errno.h>
33#include "port_after.h"
34
35/*%
36 * WARNING: Don't even consider trying to compile this on a system where
37 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
38 */
39
40static int inet_pton4(const char *src, u_char *dst);
41static int inet_pton6(const char *src, u_char *dst);
42
43/* int
44 * inet_pton(af, src, dst)
45 * convert from presentation format (which usually means ASCII printable)
46 * to network format (which is usually some kind of binary format).
47 * return:
48 * 1 if the address was valid for the specified address family
49 * 0 if the address wasn't valid (`dst' is untouched in this case)
50 * -1 if some other error occurred (`dst' is untouched in this case, too)
51 * author:
52 * Paul Vixie, 1996.
53 */
54int
55inet_pton(int af, const char * __restrict src, void * __restrict dst)
56{
57 switch (af) {
58 case AF_INET:
59 return (inet_pton4(src, dst));
60 case AF_INET6:
61 return (inet_pton6(src, dst));
62 default:
63 errno = EAFNOSUPPORT;
64 return (-1);
65 }
66 /* NOTREACHED */
67}
68
69/* int
70 * inet_pton4(src, dst)
71 * like inet_aton() but without all the hexadecimal and shorthand.
72 * return:
73 * 1 if `src' is a valid dotted quad, else 0.
74 * notice:
75 * does not touch `dst' unless it's returning 1.
76 * author:
77 * Paul Vixie, 1996.
78 */
79static int
80inet_pton4(const char *src, u_char *dst)
81{
82 static const char digits[] = "0123456789";
83 int saw_digit, octets, ch;
84 u_char tmp[NS_INADDRSZ], *tp;
85
86 saw_digit = 0;
87 octets = 0;
88 *(tp = tmp) = 0;
89 while ((ch = *src++) != '\0') {
90 const char *pch;
91
92 if ((pch = strchr(digits, ch)) != NULL) {
93 u_int new = *tp * 10 + (pch - digits);
94
95 if (saw_digit && *tp == 0)
96 return (0);
97 if (new > 255)
98 return (0);
99 *tp = new;
100 if (!saw_digit) {
101 if (++octets > 4)
102 return (0);
103 saw_digit = 1;
104 }
105 } else if (ch == '.' && saw_digit) {
106 if (octets == 4)
107 return (0);
108 *++tp = 0;
109 saw_digit = 0;
110 } else
111 return (0);
112 }
113 if (octets < 4)
114 return (0);
115 memcpy(dst, tmp, NS_INADDRSZ);
116 return (1);
117}
118
119/* int
120 * inet_pton6(src, dst)
121 * convert presentation level address to network order binary form.
122 * return:
123 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
124 * notice:
125 * (1) does not touch `dst' unless it's returning 1.
126 * (2) :: in a full address is silently ignored.
127 * credit:
128 * inspired by Mark Andrews.
129 * author:
130 * Paul Vixie, 1996.
131 */
132static int
133inet_pton6(const char *src, u_char *dst)
134{
135 static const char xdigits_l[] = "0123456789abcdef",
136 xdigits_u[] = "0123456789ABCDEF";
137 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
138 const char *xdigits, *curtok;
139 int ch, seen_xdigits;
140 u_int val;
141
142 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
143 endp = tp + NS_IN6ADDRSZ;
144 colonp = NULL;
145 /* Leading :: requires some special handling. */
146 if (*src == ':')
147 if (*++src != ':')
148 return (0);
149 curtok = src;
150 seen_xdigits = 0;
151 val = 0;
152 while ((ch = *src++) != '\0') {
153 const char *pch;
154
155 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
156 pch = strchr((xdigits = xdigits_u), ch);
157 if (pch != NULL) {
158 val <<= 4;
159 val |= (pch - xdigits);
160 if (++seen_xdigits > 4)
161 return (0);
162 continue;
163 }
164 if (ch == ':') {
165 curtok = src;
166 if (!seen_xdigits) {
167 if (colonp)
168 return (0);
169 colonp = tp;
170 continue;
171 } else if (*src == '\0') {
172 return (0);
173 }
174 if (tp + NS_INT16SZ > endp)
175 return (0);
176 *tp++ = (u_char) (val >> 8) & 0xff;
177 *tp++ = (u_char) val & 0xff;
178 seen_xdigits = 0;
179 val = 0;
180 continue;
181 }
182 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
183 inet_pton4(curtok, tp) > 0) {
184 tp += NS_INADDRSZ;
185 seen_xdigits = 0;
186 break; /*%< '\\0' was seen by inet_pton4(). */
187 }
188 return (0);
189 }
190 if (seen_xdigits) {
191 if (tp + NS_INT16SZ > endp)
192 return (0);
193 *tp++ = (u_char) (val >> 8) & 0xff;
194 *tp++ = (u_char) val & 0xff;
195 }
196 if (colonp != NULL) {
197 /*
198 * Since some memmove()'s erroneously fail to handle
199 * overlapping regions, we'll do the shift by hand.
200 */
201 const int n = tp - colonp;
202 int i;
203
204 if (tp == endp)
205 return (0);
206 for (i = 1; i <= n; i++) {
207 endp[- i] = colonp[n - i];
208 colonp[n - i] = 0;
209 }
210 tp = endp;
211 }
212 if (tp != endp)
213 return (0);
214 memcpy(dst, tmp, NS_IN6ADDRSZ);
215 return (1);
216}
217
218/*
219 * Weak aliases for applications that use certain private entry points,
220 * and fail to include <arpa/inet.h>.
221 */
222#undef inet_pton
223__weak_reference(__inet_pton, inet_pton);
224
225/*! \file */