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 #include <sys/param.h>
19 #include <sys/socket.h>
20 #include <sys/systm.h>
21
22 #include <netinet/in.h>
23
24 /*%
25 * WARNING: Don't even consider trying to compile this on a system where
26 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
27 */
28
29 static int inet_pton4(const char *src, u_char *dst);
30 static int inet_pton6(const char *src, u_char *dst);
31
32 /* int
33 * inet_pton(af, src, dst)
34 * convert from presentation format (which usually means ASCII printable)
35 * to network format (which is usually some kind of binary format).
36 * return:
37 * 1 if the address was valid for the specified address family
38 * 0 if the address wasn't valid (`dst' is untouched in this case)
39 * -1 if some other error occurred (`dst' is untouched in this case, too)
40 * author:
41 * Paul Vixie, 1996.
42 */
43 int
inet_pton(int af,const char * src,void * dst)44 inet_pton(int af, const char *src, void *dst)
45 {
46 switch (af) {
47 case AF_INET:
48 return (inet_pton4(src, dst));
49 case AF_INET6:
50 return (inet_pton6(src, dst));
51 default:
52 return (-1);
53 }
54 /* NOTREACHED */
55 }
56
57 /* int
58 * inet_pton4(src, dst)
59 * like inet_aton() but without all the hexadecimal and shorthand.
60 * return:
61 * 1 if `src' is a valid dotted quad, else 0.
62 * notice:
63 * does not touch `dst' unless it's returning 1.
64 * author:
65 * Paul Vixie, 1996.
66 */
67 static int
inet_pton4(const char * src,u_char * dst)68 inet_pton4(const char *src, u_char *dst)
69 {
70 static const char digits[] = "0123456789";
71 int saw_digit, octets, ch;
72 #define NS_INADDRSZ 4
73 u_char tmp[NS_INADDRSZ], *tp;
74
75 saw_digit = 0;
76 octets = 0;
77 *(tp = tmp) = 0;
78 while ((ch = *src++) != '\0') {
79 const char *pch;
80
81 if ((pch = strchr(digits, ch)) != NULL) {
82 u_int new = *tp * 10 + (pch - digits);
83
84 if (saw_digit && *tp == 0)
85 return (0);
86 if (new > 255)
87 return (0);
88 *tp = new;
89 if (!saw_digit) {
90 if (++octets > 4)
91 return (0);
92 saw_digit = 1;
93 }
94 } else if (ch == '.' && saw_digit) {
95 if (octets == 4)
96 return (0);
97 *++tp = 0;
98 saw_digit = 0;
99 } else
100 return (0);
101 }
102 if (octets < 4)
103 return (0);
104 memcpy(dst, tmp, NS_INADDRSZ);
105 return (1);
106 }
107
108 /* int
109 * inet_pton6(src, dst)
110 * convert presentation level address to network order binary form.
111 * return:
112 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
113 * notice:
114 * (1) does not touch `dst' unless it's returning 1.
115 * (2) :: in a full address is silently ignored.
116 * credit:
117 * inspired by Mark Andrews.
118 * author:
119 * Paul Vixie, 1996.
120 */
121 static int
inet_pton6(const char * src,u_char * dst)122 inet_pton6(const char *src, u_char *dst)
123 {
124 static const char xdigits_l[] = "0123456789abcdef",
125 xdigits_u[] = "0123456789ABCDEF";
126 #define NS_IN6ADDRSZ 16
127 #define NS_INT16SZ 2
128 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
129 const char *xdigits, *curtok;
130 int ch, seen_xdigits;
131 u_int val;
132
133 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
134 endp = tp + NS_IN6ADDRSZ;
135 colonp = NULL;
136 /* Leading :: requires some special handling. */
137 if (*src == ':')
138 if (*++src != ':')
139 return (0);
140 curtok = src;
141 seen_xdigits = 0;
142 val = 0;
143 while ((ch = *src++) != '\0') {
144 const char *pch;
145
146 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
147 pch = strchr((xdigits = xdigits_u), ch);
148 if (pch != NULL) {
149 val <<= 4;
150 val |= (pch - xdigits);
151 if (++seen_xdigits > 4)
152 return (0);
153 continue;
154 }
155 if (ch == ':') {
156 curtok = src;
157 if (!seen_xdigits) {
158 if (colonp)
159 return (0);
160 colonp = tp;
161 continue;
162 } else if (*src == '\0') {
163 return (0);
164 }
165 if (tp + NS_INT16SZ > endp)
166 return (0);
167 *tp++ = (u_char) (val >> 8) & 0xff;
168 *tp++ = (u_char) val & 0xff;
169 seen_xdigits = 0;
170 val = 0;
171 continue;
172 }
173 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
174 inet_pton4(curtok, tp) > 0) {
175 tp += NS_INADDRSZ;
176 seen_xdigits = 0;
177 break; /*%< '\\0' was seen by inet_pton4(). */
178 }
179 return (0);
180 }
181 if (seen_xdigits) {
182 if (tp + NS_INT16SZ > endp)
183 return (0);
184 *tp++ = (u_char) (val >> 8) & 0xff;
185 *tp++ = (u_char) val & 0xff;
186 }
187 if (colonp != NULL) {
188 /*
189 * Since some memmove()'s erroneously fail to handle
190 * overlapping regions, we'll do the shift by hand.
191 */
192 const int n = tp - colonp;
193 int i;
194
195 if (tp == endp)
196 return (0);
197 for (i = 1; i <= n; i++) {
198 endp[- i] = colonp[n - i];
199 colonp[n - i] = 0;
200 }
201 tp = endp;
202 }
203 if (tp != endp)
204 return (0);
205 memcpy(dst, tmp, NS_IN6ADDRSZ);
206 return (1);
207 }
208
209 /*! \file */
210