2 * SPDX-License-Identifier: ISC
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
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.
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.
20 #if defined(LIBC_SCCS) && !defined(lint)
21 static const char rcsid[] = "$Id: inet_pton.c,v 1.5 2005/07/28 06:51:47 marka Exp $";
22 #endif /* LIBC_SCCS and not lint */
23 #include <sys/cdefs.h>
24 __FBSDID("$FreeBSD$");
26 #include "port_before.h"
27 #include <sys/param.h>
28 #include <sys/socket.h>
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
31 #include <arpa/nameser.h>
34 #include "port_after.h"
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.
41 static int inet_pton4(const char *src, u_char *dst);
42 static int inet_pton6(const char *src, u_char *dst);
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).
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)
56 inet_pton(int af, const char * __restrict src, void * __restrict dst)
60 return (inet_pton4(src, dst));
62 return (inet_pton6(src, dst));
71 * inet_pton4(src, dst)
72 * like inet_aton() but without all the hexadecimal and shorthand.
74 * 1 if `src' is a valid dotted quad, else 0.
76 * does not touch `dst' unless it's returning 1.
81 inet_pton4(const char *src, u_char *dst)
83 static const char digits[] = "0123456789";
84 int saw_digit, octets, ch;
85 u_char tmp[NS_INADDRSZ], *tp;
90 while ((ch = *src++) != '\0') {
93 if ((pch = strchr(digits, ch)) != NULL) {
94 u_int new = *tp * 10 + (pch - digits);
96 if (saw_digit && *tp == 0)
106 } else if (ch == '.' && saw_digit) {
116 memcpy(dst, tmp, NS_INADDRSZ);
121 * inet_pton6(src, dst)
122 * convert presentation level address to network order binary form.
124 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
126 * (1) does not touch `dst' unless it's returning 1.
127 * (2) :: in a full address is silently ignored.
129 * inspired by Mark Andrews.
134 inet_pton6(const char *src, u_char *dst)
136 static const char xdigits_l[] = "0123456789abcdef",
137 xdigits_u[] = "0123456789ABCDEF";
138 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
139 const char *xdigits, *curtok;
140 int ch, seen_xdigits;
143 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
144 endp = tp + NS_IN6ADDRSZ;
146 /* Leading :: requires some special handling. */
153 while ((ch = *src++) != '\0') {
156 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
157 pch = strchr((xdigits = xdigits_u), ch);
160 val |= (pch - xdigits);
161 if (++seen_xdigits > 4)
172 } else if (*src == '\0') {
175 if (tp + NS_INT16SZ > endp)
177 *tp++ = (u_char) (val >> 8) & 0xff;
178 *tp++ = (u_char) val & 0xff;
183 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
184 inet_pton4(curtok, tp) > 0) {
187 break; /*%< '\\0' was seen by inet_pton4(). */
192 if (tp + NS_INT16SZ > endp)
194 *tp++ = (u_char) (val >> 8) & 0xff;
195 *tp++ = (u_char) val & 0xff;
197 if (colonp != NULL) {
199 * Since some memmove()'s erroneously fail to handle
200 * overlapping regions, we'll do the shift by hand.
202 const int n = tp - colonp;
207 for (i = 1; i <= n; i++) {
208 endp[- i] = colonp[n - i];
215 memcpy(dst, tmp, NS_IN6ADDRSZ);
220 * Weak aliases for applications that use certain private entry points,
221 * and fail to include <arpa/inet.h>.
224 __weak_reference(__inet_pton, inet_pton);