2 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$BINDId: inet_pton.c,v 1.7 1999/10/13 16:39:28 vixie Exp $";
20 #endif /* LIBC_SCCS and not lint */
22 #include <sys/param.h>
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <arpa/nameser.h>
33 * WARNING: Don't even consider trying to compile this on a system where
34 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
37 static int inet_pton4 (const char *src, u_char *dst) internal_function;
38 static int inet_pton6 (const char *src, u_char *dst) internal_function;
41 * inet_pton(af, src, dst)
42 * convert from presentation format (which usually means ASCII printable)
43 * to network format (which is usually some kind of binary format).
45 * 1 if the address was valid for the specified address family
46 * 0 if the address wasn't valid (`dst' is untouched in this case)
47 * -1 if some other error occurred (`dst' is untouched in this case, too)
52 __inet_pton(af, src, dst)
59 return (inet_pton4(src, dst));
61 return (inet_pton6(src, dst));
63 __set_errno (EAFNOSUPPORT);
68 libc_hidden_def (__inet_pton)
69 weak_alias (__inet_pton, inet_pton)
70 libc_hidden_weak (inet_pton)
73 * inet_pton4(src, dst)
74 * like inet_aton() but without all the hexadecimal, octal (with the
75 * exception of 0) and shorthand.
77 * 1 if `src' is a valid dotted quad, else 0.
79 * does not touch `dst' unless it's returning 1.
89 int saw_digit, octets, ch;
90 u_char tmp[NS_INADDRSZ], *tp;
95 while ((ch = *src++) != '\0') {
97 if (ch >= '0' && ch <= '9') {
98 u_int new = *tp * 10 + (ch - '0');
100 if (saw_digit && *tp == 0)
110 } else if (ch == '.' && saw_digit) {
120 memcpy(dst, tmp, NS_INADDRSZ);
125 * inet_pton6(src, dst)
126 * convert presentation level address to network order binary form.
128 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
130 * (1) does not touch `dst' unless it's returning 1.
131 * (2) :: in a full address is silently ignored.
133 * inspired by Mark Andrews.
143 static const char xdigits[] = "0123456789abcdef";
144 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
149 tp = memset(tmp, '\0', NS_IN6ADDRSZ);
150 endp = tp + NS_IN6ADDRSZ;
152 /* Leading :: requires some special handling. */
159 while ((ch = tolower (*src++)) != '\0') {
162 pch = strchr(xdigits, ch);
165 val |= (pch - xdigits);
178 } else if (*src == '\0') {
181 if (tp + NS_INT16SZ > endp)
183 *tp++ = (u_char) (val >> 8) & 0xff;
184 *tp++ = (u_char) val & 0xff;
189 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
190 inet_pton4(curtok, tp) > 0) {
193 break; /* '\0' was seen by inet_pton4(). */
198 if (tp + NS_INT16SZ > endp)
200 *tp++ = (u_char) (val >> 8) & 0xff;
201 *tp++ = (u_char) val & 0xff;
203 if (colonp != NULL) {
205 * Since some memmove()'s erroneously fail to handle
206 * overlapping regions, we'll do the shift by hand.
208 const int n = tp - colonp;
213 for (i = 1; i <= n; i++) {
214 endp[- i] = colonp[n - i];
221 memcpy(dst, tmp, NS_IN6ADDRSZ);