1/*
2 * Copyright (c) 1996,1999 by Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 * SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$BINDId: inet_pton.c,v 1.7 1999/10/13 16:39:28 vixie Exp $";
20#endif /* LIBC_SCCS and not lint */
21
22#include <sys/param.h>
23#include <sys/types.h>
24#include <sys/socket.h>
25#include <netinet/in.h>
26#include <arpa/inet.h>
27#include <arpa/nameser.h>
28#include <ctype.h>
29#include <string.h>
30#include <errno.h>
31
32/*
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
35 */
36
37static int inet_pton4 (const char *src, u_char *dst) internal_function;
38static int inet_pton6 (const char *src, u_char *dst) internal_function;
39
40/* int
41 * inet_pton(af, src, dst)
42 * convert from presentation format (which usually means ASCII printable)
43 * to network format (which is usually some kind of binary format).
44 * return:
45 * 1 if the address was valid for the specified address family
46 * 0 if the address wasn't valid (`dst' is untouched in this case)
47 * -1 if some other error occurred (`dst' is untouched in this case, too)
48 * author:
49 * Paul Vixie, 1996.
50 */
51int
52__inet_pton (int af, const char *src, void *dst)
53{
54 switch (af) {
55 case AF_INET:
56 return (inet_pton4(src, dst));
57 case AF_INET6:
58 return (inet_pton6(src, dst));
59 default:
60 __set_errno (EAFNOSUPPORT);
61 return (-1);
62 }
63 /* NOTREACHED */
64}
65libc_hidden_def (__inet_pton)
66weak_alias (__inet_pton, inet_pton)
67libc_hidden_weak (inet_pton)
68
69/* int
70 * inet_pton4(src, dst)
71 * like inet_aton() but without all the hexadecimal, octal (with the
72 * exception of 0) and shorthand.
73 * return:
74 * 1 if `src' is a valid dotted quad, else 0.
75 * notice:
76 * does not touch `dst' unless it's returning 1.
77 * author:
78 * Paul Vixie, 1996.
79 */
80static int
81internal_function
82inet_pton4 (const char *src, u_char *dst)
83{
84 int saw_digit, octets, ch;
85 u_char tmp[NS_INADDRSZ], *tp;
86
87 saw_digit = 0;
88 octets = 0;
89 *(tp = tmp) = 0;
90 while ((ch = *src++) != '\0') {
91
92 if (ch >= '0' && ch <= '9') {
93 u_int new = *tp * 10 + (ch - '0');
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
133internal_function
134inet_pton6 (const char *src, u_char *dst)
135{
136 static const char xdigits[] = "0123456789abcdef";
137 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
138 const char *curtok;
139 int ch, saw_xdigit;
140 u_int val;
141
142 tp = memset(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 saw_xdigit = 0;
151 val = 0;
152 while ((ch = tolower (*src++)) != '\0') {
153 const char *pch;
154
155 pch = strchr(xdigits, ch);
156 if (pch != NULL) {
157 val <<= 4;
158 val |= (pch - xdigits);
159 if (val > 0xffff)
160 return (0);
161 saw_xdigit = 1;
162 continue;
163 }
164 if (ch == ':') {
165 curtok = src;
166 if (!saw_xdigit) {
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 saw_xdigit = 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 saw_xdigit = 0;
186 break; /* '\0' was seen by inet_pton4(). */
187 }
188 return (0);
189 }
190 if (saw_xdigit) {
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