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)
19 static 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$");
23
24 #include <sys/param.h>
25 #include <sys/socket.h>
26 #include <sys/systm.h>
27
28 #include <netinet/in.h>
29
30 /*%
31 * WARNING: Don't even consider trying to compile this on a system where
32 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
33 */
34
35 static int inet_pton4(const char *src, u_char *dst);
36 static int inet_pton6(const char *src, u_char *dst);
37
38 /* int
39 * inet_pton(af, src, dst)
40 * convert from presentation format (which usually means ASCII printable)
41 * to network format (which is usually some kind of binary format).
42 * return:
43 * 1 if the address was valid for the specified address family
44 * 0 if the address wasn't valid (`dst' is untouched in this case)
45 * -1 if some other error occurred (`dst' is untouched in this case, too)
46 * author:
47 * Paul Vixie, 1996.
48 */
49 int
50 inet_pton(int af, const char *src, void *dst)
51 {
52 switch (af) {
53 case AF_INET:
54 return (inet_pton4(src, dst));
55 case AF_INET6:
56 return (inet_pton6(src, dst));
57 default:
58 return (-1);
59 }
60 /* NOTREACHED */
61 }
62
63 /* int
64 * inet_pton4(src, dst)
65 * like inet_aton() but without all the hexadecimal and shorthand.
66 * return:
67 * 1 if `src' is a valid dotted quad, else 0.
68 * notice:
69 * does not touch `dst' unless it's returning 1.
70 * author:
71 * Paul Vixie, 1996.
72 */
73 static int
74 inet_pton4(const char *src, u_char *dst)
75 {
76 static const char digits[] = "0123456789";
77 int saw_digit, octets, ch;
78 #define NS_INADDRSZ 4
79 u_char tmp[NS_INADDRSZ], *tp;
80
81 saw_digit = 0;
82 octets = 0;
83 *(tp = tmp) = 0;
84 while ((ch = *src++) != '\0') {
85 const char *pch;
86
87 if ((pch = strchr(digits, ch)) != NULL) {
88 u_int new = *tp * 10 + (pch - digits);
89
90 if (saw_digit && *tp == 0)
91 return (0);
92 if (new > 255)
93 return (0);
94 *tp = new;
95 if (!saw_digit) {
96 if (++octets > 4)
97 return (0);
98 saw_digit = 1;
99 }
100 } else if (ch == '.' && saw_digit) {
101 if (octets == 4)
102 return (0);
103 *++tp = 0;
104 saw_digit = 0;
105 } else
106 return (0);
107 }
108 if (octets < 4)
109 return (0);
110 memcpy(dst, tmp, NS_INADDRSZ);
111 return (1);
112 }
113
114 /* int
115 * inet_pton6(src, dst)
116 * convert presentation level address to network order binary form.
117 * return:
118 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
119 * notice:
120 * (1) does not touch `dst' unless it's returning 1.
121 * (2) :: in a full address is silently ignored.
122 * credit:
123 * inspired by Mark Andrews.
124 * author:
125 * Paul Vixie, 1996.
126 */
127 static int
128 inet_pton6(const char *src, u_char *dst)
129 {
130 static const char xdigits_l[] = "0123456789abcdef",
131 xdigits_u[] = "0123456789ABCDEF";
132 #define NS_IN6ADDRSZ 16
133 #define NS_INT16SZ 2
134 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
135 const char *xdigits, *curtok;
136 int ch, seen_xdigits;
137 u_int val;
138
139 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
140 endp = tp + NS_IN6ADDRSZ;
141 colonp = NULL;
142 /* Leading :: requires some special handling. */
143 if (*src == ':')
144 if (*++src != ':')
145 return (0);
146 curtok = src;
147 seen_xdigits = 0;
148 val = 0;
149 while ((ch = *src++) != '\0') {
150 const char *pch;
151
152 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
153 pch = strchr((xdigits = xdigits_u), ch);
154 if (pch != NULL) {
155 val <<= 4;
156 val |= (pch - xdigits);
157 if (++seen_xdigits > 4)
158 return (0);
159 continue;
160 }
161 if (ch == ':') {
162 curtok = src;
163 if (!seen_xdigits) {
164 if (colonp)
165 return (0);
166 colonp = tp;
167 continue;
168 } else if (*src == '\0') {
169 return (0);
170 }
171 if (tp + NS_INT16SZ > endp)
172 return (0);
173 *tp++ = (u_char) (val >> 8) & 0xff;
174 *tp++ = (u_char) val & 0xff;
175 seen_xdigits = 0;
176 val = 0;
177 continue;
178 }
179 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
180 inet_pton4(curtok, tp) > 0) {
181 tp += NS_INADDRSZ;
182 seen_xdigits = 0;
183 break; /*%< '\\' was seen by inet_pton4(). */
184 }
185 return (0);
186 }
187 if (seen_xdigits) {
188 if (tp + NS_INT16SZ > endp)
189 return (0);
190 *tp++ = (u_char) (val >> 8) & 0xff;
191 *tp++ = (u_char) val & 0xff;
192 }
193 if (colonp != NULL) {
194 /*
195 * Since some memmove()'s erroneously fail to handle
196 * overlapping regions, we'll do the shift by hand.
197 */
198 const int n = tp - colonp;
199 int i;
200
201 if (tp == endp)
202 return (0);
203 for (i = 1; i <= n; i++) {
204 endp[- i] = colonp[n - i];
205 colonp[n - i] = 0;
206 }
207 tp = endp;
208 }
209 if (tp != endp)
210 return (0);
211 memcpy(dst, tmp, NS_IN6ADDRSZ);
212 return (1);
213 }
214
215 /*! \file */
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