1 /*-
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include "port_before.h"
21 #include <sys/param.h>
22 #include <sys/socket.h>
23 #include <netinet/in.h>
24 #include <arpa/inet.h>
25 #include <arpa/nameser.h>
26 #include <string.h>
27 #include <errno.h>
28 #include "port_after.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
inet_pton(int af,const char * __restrict src,void * __restrict dst)50 inet_pton(int af, const char * __restrict src, void * __restrict 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 errno = EAFNOSUPPORT;
59 return (-1);
60 }
61 /* NOTREACHED */
62 }
63
64 /* int
65 * inet_pton4(src, dst)
66 * like inet_aton() but without all the hexadecimal and shorthand.
67 * return:
68 * 1 if `src' is a valid dotted quad, else 0.
69 * notice:
70 * does not touch `dst' unless it's returning 1.
71 * author:
72 * Paul Vixie, 1996.
73 */
74 static int
inet_pton4(const char * src,u_char * dst)75 inet_pton4(const char *src, u_char *dst)
76 {
77 static const char digits[] = "0123456789";
78 int saw_digit, octets, ch;
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
inet_pton6(const char * src,u_char * dst)128 inet_pton6(const char *src, u_char *dst)
129 {
130 static const char xdigits_l[] = "0123456789abcdef",
131 xdigits_u[] = "0123456789ABCDEF";
132 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
133 const char *xdigits, *curtok;
134 int ch, seen_xdigits;
135 u_int val;
136
137 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
138 endp = tp + NS_IN6ADDRSZ;
139 colonp = NULL;
140 /* Leading :: requires some special handling. */
141 if (*src == ':')
142 if (*++src != ':')
143 return (0);
144 curtok = src;
145 seen_xdigits = 0;
146 val = 0;
147 while ((ch = *src++) != '\0') {
148 const char *pch;
149
150 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
151 pch = strchr((xdigits = xdigits_u), ch);
152 if (pch != NULL) {
153 val <<= 4;
154 val |= (pch - xdigits);
155 if (++seen_xdigits > 4)
156 return (0);
157 continue;
158 }
159 if (ch == ':') {
160 curtok = src;
161 if (!seen_xdigits) {
162 if (colonp)
163 return (0);
164 colonp = tp;
165 continue;
166 } else if (*src == '\0') {
167 return (0);
168 }
169 if (tp + NS_INT16SZ > endp)
170 return (0);
171 *tp++ = (u_char) (val >> 8) & 0xff;
172 *tp++ = (u_char) val & 0xff;
173 seen_xdigits = 0;
174 val = 0;
175 continue;
176 }
177 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
178 inet_pton4(curtok, tp) > 0) {
179 tp += NS_INADDRSZ;
180 seen_xdigits = 0;
181 break; /*%< '\\0' was seen by inet_pton4(). */
182 }
183 return (0);
184 }
185 if (seen_xdigits) {
186 if (tp + NS_INT16SZ > endp)
187 return (0);
188 *tp++ = (u_char) (val >> 8) & 0xff;
189 *tp++ = (u_char) val & 0xff;
190 }
191 if (colonp != NULL) {
192 /*
193 * Since some memmove()'s erroneously fail to handle
194 * overlapping regions, we'll do the shift by hand.
195 */
196 const int n = tp - colonp;
197 int i;
198
199 if (tp == endp)
200 return (0);
201 for (i = 1; i <= n; i++) {
202 endp[- i] = colonp[n - i];
203 colonp[n - i] = 0;
204 }
205 tp = endp;
206 }
207 if (tp != endp)
208 return (0);
209 memcpy(dst, tmp, NS_IN6ADDRSZ);
210 return (1);
211 }
212
213 /*
214 * Weak aliases for applications that use certain private entry points,
215 * and fail to include <arpa/inet.h>.
216 */
217 #undef inet_pton
218 __weak_reference(__inet_pton, inet_pton);
219
220 /*! \file */
221