1 /* inet_pton.c -- convert IPv4 and IPv6 addresses from text to binary form
3 Copyright (C) 2006 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 * Copyright (c) 1996,1999 by Internet Software Consortium.
22 * Permission to use, copy, modify, and distribute this software for any
23 * purpose with or without fee is hereby granted, provided that the above
24 * copyright notice and this permission notice appear in all copies.
26 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
27 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
29 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
30 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
31 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
32 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
39 #include "inet_pton.h"
46 # define EAFNOSUPPORT EINVAL
50 #define NS_IN6ADDRSZ 16
54 * WARNING: Don't even consider trying to compile this on a system where
55 * sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
58 static int inet_pton4 (const char *src, unsigned char *dst);
60 static int inet_pton6 (const char *src, unsigned char *dst);
64 * inet_pton(af, src, dst)
65 * convert from presentation format (which usually means ASCII printable)
66 * to network format (which is usually some kind of binary format).
68 * 1 if the address was valid for the specified address family
69 * 0 if the address wasn't valid (`dst' is untouched in this case)
70 * -1 if some other error occurred (`dst' is untouched in this case, too)
75 inet_pton (int af, const char *restrict src, void *restrict dst)
80 return (inet_pton4 (src, dst));
84 return (inet_pton6 (src, dst));
95 * inet_pton4(src, dst)
96 * like inet_aton() but without all the hexadecimal, octal (with the
97 * exception of 0) and shorthand.
99 * 1 if `src' is a valid dotted quad, else 0.
101 * does not touch `dst' unless it's returning 1.
106 inet_pton4 (const char *restrict src, unsigned char *restrict dst)
108 int saw_digit, octets, ch;
109 unsigned char tmp[NS_INADDRSZ], *tp;
114 while ((ch = *src++) != '\0')
117 if (ch >= '0' && ch <= '9')
119 unsigned new = *tp * 10 + (ch - '0');
121 if (saw_digit && *tp == 0)
133 else if (ch == '.' && saw_digit)
145 memcpy (dst, tmp, NS_INADDRSZ);
152 * inet_pton6(src, dst)
153 * convert presentation level address to network order binary form.
155 * 1 if `src' is a valid [RFC1884 2.2] address, else 0.
157 * (1) does not touch `dst' unless it's returning 1.
158 * (2) :: in a full address is silently ignored.
160 * inspired by Mark Andrews.
165 inet_pton6 (const char *restrict src, unsigned char *restrict dst)
167 static const char xdigits[] = "0123456789abcdef";
168 unsigned char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
173 tp = memset (tmp, '\0', NS_IN6ADDRSZ);
174 endp = tp + NS_IN6ADDRSZ;
176 /* Leading :: requires some special handling. */
183 while ((ch = tolower (*src++)) != '\0')
187 pch = strchr (xdigits, ch);
191 val |= (pch - xdigits);
207 else if (*src == '\0')
211 if (tp + NS_INT16SZ > endp)
213 *tp++ = (u_char) (val >> 8) & 0xff;
214 *tp++ = (u_char) val & 0xff;
219 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
220 inet_pton4 (curtok, tp) > 0)
224 break; /* '\0' was seen by inet_pton4(). */
230 if (tp + NS_INT16SZ > endp)
232 *tp++ = (u_char) (val >> 8) & 0xff;
233 *tp++ = (u_char) val & 0xff;
238 * Since some memmove()'s erroneously fail to handle
239 * overlapping regions, we'll do the shift by hand.
241 const int n = tp - colonp;
246 for (i = 1; i <= n; i++)
248 endp[-i] = colonp[n - i];
255 memcpy (dst, tmp, NS_IN6ADDRSZ);