1 /* $KAME: inet_pton.c,v 1.5 2001/08/20 02:32:40 itojun Exp $ */
2
3 /* Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
10 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
11 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
12 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
14 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
15 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
16 * SOFTWARE.
17 */
18
19 #include <config.h>
20
21 #include <string.h>
22 #include <stdio.h>
23 #include <errno.h>
24
25 /*
26 * WARNING: Don't even consider trying to compile this on a system where
27 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
28 */
29
30 static int inet_pton4 (const char *src, uint8_t *dst);
31 static int inet_pton6 (const char *src, uint8_t *dst);
32
33 /*
34 *
35 * The definitions we might miss.
36 *
37 */
38 #ifndef NS_INT16SZ
39 #define NS_INT16SZ 2
40 #endif
41
42 #ifndef NS_IN6ADDRSZ
43 #define NS_IN6ADDRSZ 16
44 #endif
45
46 #ifndef NS_INADDRSZ
47 #define NS_INADDRSZ 4
48 #endif
49
50 /* int
51 * inet_pton(af, src, dst)
52 * convert from presentation format (which usually means ASCII printable)
53 * to network format (which is usually some kind of binary format).
54 * return:
55 * 1 if the address was valid for the specified address family
56 * 0 if the address wasn't valid (`dst' is untouched in this case)
57 * -1 if some other error occurred (`dst' is untouched in this case, too)
58 * author:
59 * Paul Vixie, 1996.
60 */
61 int
inet_pton(af,src,dst)62 inet_pton(af, src, dst)
63 int af;
64 const char *src;
65 void *dst;
66 {
67 switch (af) {
68 case AF_INET:
69 return (inet_pton4(src, dst));
70 case AF_INET6:
71 return (inet_pton6(src, dst));
72 default:
73 errno = EAFNOSUPPORT;
74 return (-1);
75 }
76 /* NOTREACHED */
77 }
78
79 /* int
80 * inet_pton4(src, dst)
81 * like inet_aton() but without all the hexadecimal and shorthand.
82 * return:
83 * 1 if `src' is a valid dotted quad, else 0.
84 * notice:
85 * does not touch `dst' unless it's returning 1.
86 * author:
87 * Paul Vixie, 1996.
88 */
89 static int
inet_pton4(src,dst)90 inet_pton4(src, dst)
91 const char *src;
92 uint8_t *dst;
93 {
94 static const char digits[] = "0123456789";
95 int saw_digit, octets, ch;
96 uint8_t tmp[NS_INADDRSZ], *tp;
97
98 saw_digit = 0;
99 octets = 0;
100 *(tp = tmp) = 0;
101 while ((ch = *src++) != '\0') {
102 const char *pch;
103
104 if ((pch = strchr(digits, ch)) != NULL) {
105 uint32_t new = *tp * 10 + (pch - digits);
106
107 if (new > 255)
108 return (0);
109 *tp = new;
110 if (! saw_digit) {
111 if (++octets > 4)
112 return (0);
113 saw_digit = 1;
114 }
115 } else if (ch == '.' && saw_digit) {
116 if (octets == 4)
117 return (0);
118 *++tp = 0;
119 saw_digit = 0;
120 } else
121 return (0);
122 }
123 if (octets < 4)
124 return (0);
125
126 memcpy(dst, tmp, NS_INADDRSZ);
127 return (1);
128 }
129
130 /* int
131 * inet_pton6(src, dst)
132 * convert presentation level address to network order binary form.
133 * return:
134 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
135 * notice:
136 * (1) does not touch `dst' unless it's returning 1.
137 * (2) :: in a full address is silently ignored.
138 * credit:
139 * inspired by Mark Andrews.
140 * author:
141 * Paul Vixie, 1996.
142 */
143 static int
inet_pton6(src,dst)144 inet_pton6(src, dst)
145 const char *src;
146 uint8_t *dst;
147 {
148 static const char xdigits_l[] = "0123456789abcdef",
149 xdigits_u[] = "0123456789ABCDEF";
150 uint8_t tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
151 const char *xdigits, *curtok;
152 int ch, saw_xdigit;
153 uint32_t val;
154
155 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
156 endp = tp + NS_IN6ADDRSZ;
157 colonp = NULL;
158 /* Leading :: requires some special handling. */
159 if (*src == ':')
160 if (*++src != ':')
161 return (0);
162 curtok = src;
163 saw_xdigit = 0;
164 val = 0;
165 while ((ch = *src++) != '\0') {
166 const char *pch;
167
168 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
169 pch = strchr((xdigits = xdigits_u), ch);
170 if (pch != NULL) {
171 val <<= 4;
172 val |= (pch - xdigits);
173 if (val > 0xffff)
174 return (0);
175 saw_xdigit = 1;
176 continue;
177 }
178 if (ch == ':') {
179 curtok = src;
180 if (!saw_xdigit) {
181 if (colonp)
182 return (0);
183 colonp = tp;
184 continue;
185 }
186 if (tp + NS_INT16SZ > endp)
187 return (0);
188 *tp++ = (uint8_t) (val >> 8) & 0xff;
189 *tp++ = (uint8_t) val & 0xff;
190 saw_xdigit = 0;
191 val = 0;
192 continue;
193 }
194 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
195 inet_pton4(curtok, tp) > 0) {
196 tp += NS_INADDRSZ;
197 saw_xdigit = 0;
198 break; /* '\0' was seen by inet_pton4(). */
199 }
200 return (0);
201 }
202 if (saw_xdigit) {
203 if (tp + NS_INT16SZ > endp)
204 return (0);
205 *tp++ = (uint8_t) (val >> 8) & 0xff;
206 *tp++ = (uint8_t) val & 0xff;
207 }
208 if (colonp != NULL) {
209 /*
210 * Since some memmove()'s erroneously fail to handle
211 * overlapping regions, we'll do the shift by hand.
212 */
213 const int n = tp - colonp;
214 int i;
215
216 for (i = 1; i <= n; i++) {
217 endp[- i] = colonp[n - i];
218 colonp[n - i] = 0;
219 }
220 tp = endp;
221 }
222 if (tp != endp)
223 return (0);
224 memcpy(dst, tmp, NS_IN6ADDRSZ);
225 return (1);
226 }
227