FreeBSD/Linux Kernel Cross Reference
sys/rpc/inet_pton.c
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: src/sys/rpc/inet_pton.c,v 1.2 2008/03/28 09:50:32 dfr Exp $");
23
24 #include <sys/param.h>
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/systm.h>
28
29 #include <rpc/types.h>
30 #include <rpc/rpc_com.h>
31
32 #if __FreeBSD_version < 700000
33 #define strchr index
34 #endif
35
36 /*%
37 * WARNING: Don't even consider trying to compile this on a system where
38 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
39 */
40
41 static int inet_pton4(const char *src, u_char *dst);
42 static int inet_pton6(const char *src, u_char *dst);
43
44 /* int
45 * inet_pton(af, src, dst)
46 * convert from presentation format (which usually means ASCII printable)
47 * to network format (which is usually some kind of binary format).
48 * return:
49 * 1 if the address was valid for the specified address family
50 * 0 if the address wasn't valid (`dst' is untouched in this case)
51 * -1 if some other error occurred (`dst' is untouched in this case, too)
52 * author:
53 * Paul Vixie, 1996.
54 */
55 int
56 __rpc_inet_pton(int af, const char * __restrict src, void * __restrict dst)
57 {
58 switch (af) {
59 case AF_INET:
60 return (inet_pton4(src, dst));
61 case AF_INET6:
62 return (inet_pton6(src, dst));
63 default:
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 */
79 static int
80 inet_pton4(const char *src, u_char *dst)
81 {
82 static const char digits[] = "0123456789";
83 int saw_digit, octets, ch;
84 #define NS_INADDRSZ 4
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 const char *pch;
92
93 if ((pch = strchr(digits, ch)) != NULL) {
94 u_int new = *tp * 10 + (pch - digits);
95
96 if (saw_digit && *tp == 0)
97 return (0);
98 if (new > 255)
99 return (0);
100 *tp = new;
101 if (!saw_digit) {
102 if (++octets > 4)
103 return (0);
104 saw_digit = 1;
105 }
106 } else if (ch == '.' && saw_digit) {
107 if (octets == 4)
108 return (0);
109 *++tp = 0;
110 saw_digit = 0;
111 } else
112 return (0);
113 }
114 if (octets < 4)
115 return (0);
116 memcpy(dst, tmp, NS_INADDRSZ);
117 return (1);
118 }
119
120 /* int
121 * inet_pton6(src, dst)
122 * convert presentation level address to network order binary form.
123 * return:
124 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
125 * notice:
126 * (1) does not touch `dst' unless it's returning 1.
127 * (2) :: in a full address is silently ignored.
128 * credit:
129 * inspired by Mark Andrews.
130 * author:
131 * Paul Vixie, 1996.
132 */
133 static int
134 inet_pton6(const char *src, u_char *dst)
135 {
136 static const char xdigits_l[] = "0123456789abcdef",
137 xdigits_u[] = "0123456789ABCDEF";
138 #define NS_IN6ADDRSZ 16
139 #define NS_INT16SZ 2
140 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
141 const char *xdigits, *curtok;
142 int ch, seen_xdigits;
143 u_int val;
144
145 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
146 endp = tp + NS_IN6ADDRSZ;
147 colonp = NULL;
148 /* Leading :: requires some special handling. */
149 if (*src == ':')
150 if (*++src != ':')
151 return (0);
152 curtok = src;
153 seen_xdigits = 0;
154 val = 0;
155 while ((ch = *src++) != '\0') {
156 const char *pch;
157
158 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
159 pch = strchr((xdigits = xdigits_u), ch);
160 if (pch != NULL) {
161 val <<= 4;
162 val |= (pch - xdigits);
163 if (++seen_xdigits > 4)
164 return (0);
165 continue;
166 }
167 if (ch == ':') {
168 curtok = src;
169 if (!seen_xdigits) {
170 if (colonp)
171 return (0);
172 colonp = tp;
173 continue;
174 } else if (*src == '\0') {
175 return (0);
176 }
177 if (tp + NS_INT16SZ > endp)
178 return (0);
179 *tp++ = (u_char) (val >> 8) & 0xff;
180 *tp++ = (u_char) val & 0xff;
181 seen_xdigits = 0;
182 val = 0;
183 continue;
184 }
185 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
186 inet_pton4(curtok, tp) > 0) {
187 tp += NS_INADDRSZ;
188 seen_xdigits = 0;
189 break; /*%< '\\' was seen by inet_pton4(). */
190 }
191 return (0);
192 }
193 if (seen_xdigits) {
194 if (tp + NS_INT16SZ > endp)
195 return (0);
196 *tp++ = (u_char) (val >> 8) & 0xff;
197 *tp++ = (u_char) val & 0xff;
198 }
199 if (colonp != NULL) {
200 /*
201 * Since some memmove()'s erroneously fail to handle
202 * overlapping regions, we'll do the shift by hand.
203 */
204 const int n = tp - colonp;
205 int i;
206
207 if (tp == endp)
208 return (0);
209 for (i = 1; i <= n; i++) {
210 endp[- i] = colonp[n - i];
211 colonp[n - i] = 0;
212 }
213 tp = endp;
214 }
215 if (tp != endp)
216 return (0);
217 memcpy(dst, tmp, NS_IN6ADDRSZ);
218 return (1);
219 }
220
221 /*
222 * Weak aliases for applications that use certain private entry points,
223 * and fail to include <arpa/inet.h>.
224 */
225 #undef inet_pton
226 __weak_reference(__inet_pton, inet_pton);
227
228 /*! \file */
229
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