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 * $Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $
18 */
19
20 #include "port_before.h"
21 #include <sys/param.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26 #include <arpa/nameser.h>
27 #include <string.h>
28 #include <errno.h>
29 #include "port_after.h"
30
31 /*%
32 * WARNING: Don't even consider trying to compile this on a system where
33 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
34 */
35
36 static int inet_pton4(const char *src, u_char *dst);
37 static int inet_pton6(const char *src, u_char *dst);
38
39 /* int
40 * inet_pton(af, src, dst)
41 * convert from presentation format (which usually means ASCII printable)
42 * to network format (which is usually some kind of binary format).
43 * return:
44 * 1 if the address was valid for the specified address family
45 * 0 if the address wasn't valid (`dst' is untouched in this case)
46 * -1 if some other error occurred (`dst' is untouched in this case, too)
47 * author:
48 * Paul Vixie, 1996.
49 */
50 int
inet_pton(int af,const char * __restrict src,void * __restrict dst)51 inet_pton(int af, const char * __restrict src, void * __restrict dst)
52 {
53 switch (af) {
54 case AF_INET:
55 return (inet_pton4(src, dst));
56 case AF_INET6:
57 return (inet_pton6(src, dst));
58 default:
59 errno = EAFNOSUPPORT;
60 return (-1);
61 }
62 /* NOTREACHED */
63 }
64
65 /* int
66 * inet_pton4(src, dst)
67 * like inet_aton() but without all the hexadecimal and shorthand.
68 * return:
69 * 1 if `src' is a valid dotted quad, else 0.
70 * notice:
71 * does not touch `dst' unless it's returning 1.
72 * author:
73 * Paul Vixie, 1996.
74 */
75 static int
inet_pton4(const char * src,u_char * dst)76 inet_pton4(const char *src, u_char *dst)
77 {
78 static const char digits[] = "0123456789";
79 int saw_digit, octets, ch;
80 u_char tmp[NS_INADDRSZ], *tp;
81
82 saw_digit = 0;
83 octets = 0;
84 *(tp = tmp) = 0;
85 while ((ch = *src++) != '\0') {
86 const char *pch;
87
88 if ((pch = strchr(digits, ch)) != NULL) {
89 u_int new = *tp * 10 + (pch - digits);
90
91 if (saw_digit && *tp == 0)
92 return (0);
93 if (new > 255)
94 return (0);
95 *tp = new;
96 if (!saw_digit) {
97 if (++octets > 4)
98 return (0);
99 saw_digit = 1;
100 }
101 } else if (ch == '.' && saw_digit) {
102 if (octets == 4)
103 return (0);
104 *++tp = 0;
105 saw_digit = 0;
106 } else
107 return (0);
108 }
109 if (octets < 4)
110 return (0);
111 memcpy(dst, tmp, NS_INADDRSZ);
112 return (1);
113 }
114
115 /* int
116 * inet_pton6(src, dst)
117 * convert presentation level address to network order binary form.
118 * return:
119 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
120 * notice:
121 * (1) does not touch `dst' unless it's returning 1.
122 * (2) :: in a full address is silently ignored.
123 * credit:
124 * inspired by Mark Andrews.
125 * author:
126 * Paul Vixie, 1996.
127 */
128 static int
inet_pton6(const char * src,u_char * dst)129 inet_pton6(const char *src, u_char *dst)
130 {
131 static const char xdigits_l[] = "0123456789abcdef",
132 xdigits_u[] = "0123456789ABCDEF";
133 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
134 const char *xdigits, *curtok;
135 int ch, seen_xdigits;
136 u_int val;
137
138 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
139 endp = tp + NS_IN6ADDRSZ;
140 colonp = NULL;
141 /* Leading :: requires some special handling. */
142 if (*src == ':')
143 if (*++src != ':')
144 return (0);
145 curtok = src;
146 seen_xdigits = 0;
147 val = 0;
148 while ((ch = *src++) != '\0') {
149 const char *pch;
150
151 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
152 pch = strchr((xdigits = xdigits_u), ch);
153 if (pch != NULL) {
154 val <<= 4;
155 val |= (pch - xdigits);
156 if (++seen_xdigits > 4)
157 return (0);
158 continue;
159 }
160 if (ch == ':') {
161 curtok = src;
162 if (!seen_xdigits) {
163 if (colonp)
164 return (0);
165 colonp = tp;
166 continue;
167 } else if (*src == '\0') {
168 return (0);
169 }
170 if (tp + NS_INT16SZ > endp)
171 return (0);
172 *tp++ = (u_char) (val >> 8) & 0xff;
173 *tp++ = (u_char) val & 0xff;
174 seen_xdigits = 0;
175 val = 0;
176 continue;
177 }
178 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
179 inet_pton4(curtok, tp) > 0) {
180 tp += NS_INADDRSZ;
181 seen_xdigits = 0;
182 break; /*%< '\\0' was seen by inet_pton4(). */
183 }
184 return (0);
185 }
186 if (seen_xdigits) {
187 if (tp + NS_INT16SZ > endp)
188 return (0);
189 *tp++ = (u_char) (val >> 8) & 0xff;
190 *tp++ = (u_char) val & 0xff;
191 }
192 if (colonp != NULL) {
193 /*
194 * Since some memmove()'s erroneously fail to handle
195 * overlapping regions, we'll do the shift by hand.
196 */
197 const int n = tp - colonp;
198 int i;
199
200 if (tp == endp)
201 return (0);
202 for (i = 1; i <= n; i++) {
203 endp[- i] = colonp[n - i];
204 colonp[n - i] = 0;
205 }
206 tp = endp;
207 }
208 if (tp != endp)
209 return (0);
210 memcpy(dst, tmp, NS_IN6ADDRSZ);
211 return (1);
212 }
213
214 /*
215 * Weak aliases for applications that use certain private entry points,
216 * and fail to include <arpa/inet.h>.
217 */
218 #undef inet_pton
219 __weak_reference(__inet_pton, inet_pton);
220