2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1998,1999 by Internet Software Consortium.
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.
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.
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_cidr_pton.c,v 1.6 2005/04/27 04:56:19 sra Exp $";
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
24 #include "port_before.h"
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/nameser.h>
30 #include <arpa/inet.h>
39 #include "port_after.h"
42 # define SPRINTF(x) strlen(sprintf/**/x)
44 # define SPRINTF(x) ((size_t)sprintf x)
47 static int inet_cidr_pton_ipv4 (const char *src, u_char *dst, int *bits,
49 static int inet_cidr_pton_ipv6 (const char *src, u_char *dst, int *bits);
51 static int getbits(const char *, int ipv6);
55 * inet_cidr_pton(af, src, dst, *bits)
56 * convert network address from presentation to network format.
57 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
58 * "dst" is assumed large enough for its "af". "bits" is set to the
59 * /CIDR prefix length, which can have defaults (like /32 for IPv4).
61 * -1 if an error occurred (inspect errno; ENOENT means bad format).
62 * 0 if successful conversion occurred.
64 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
65 * as called for by inet_net_pton() but it can be a host address with
66 * an included netmask.
68 * Paul Vixie (ISC), October 1998
71 inet_cidr_pton(int af, const char *src, void *dst, int *bits) {
74 return (inet_cidr_pton_ipv4(src, dst, bits, 0));
76 return (inet_cidr_pton_ipv6(src, dst, bits));
83 static const char digits[] = "0123456789";
86 inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) {
87 const u_char *odst = dst;
91 /* Get the mantissa. */
92 while (ch = *src++, (isascii(ch) && isdigit(ch))) {
95 n = strchr(digits, ch) - digits;
96 assert(n >= 0 && n <= 9);
101 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
104 *dst++ = (u_char) tmp;
105 if (ch == '\0' || ch == '/')
111 /* Get the prefix length if any. */
113 if (ch == '/' && dst > odst) {
114 bits = getbits(src, ipv6);
117 } else if (ch != '\0')
120 /* Prefix length can default to /32 only if all four octets spec'd. */
123 bits = ipv6 ? 128 : 32;
128 /* If nothing was written to the destination, we found no address. */
132 /* If prefix length overspecifies mantissa, life is bad. */
133 if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst))
136 /* Extend address to four octets. */
153 inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) {
154 static const char xdigits_l[] = "0123456789abcdef",
155 xdigits_u[] = "0123456789ABCDEF";
156 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
157 const char *xdigits, *curtok;
162 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
163 endp = tp + NS_IN6ADDRSZ;
165 /* Leading :: requires some special handling. */
173 while ((ch = *src++) != '\0') {
176 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
177 pch = strchr((xdigits = xdigits_u), ch);
180 val |= (pch - xdigits);
193 } else if (*src == '\0') {
196 if (tp + NS_INT16SZ > endp)
198 *tp++ = (u_char) (val >> 8) & 0xff;
199 *tp++ = (u_char) val & 0xff;
204 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
205 inet_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) {
208 break; /*%< '\\0' was seen by inet_pton4(). */
211 bits = getbits(src, 1);
219 if (tp + NS_INT16SZ > endp)
221 *tp++ = (u_char) (val >> 8) & 0xff;
222 *tp++ = (u_char) val & 0xff;
224 if (colonp != NULL) {
226 * Since some memmove()'s erroneously fail to handle
227 * overlapping regions, we'll do the shift by hand.
229 const int n = tp - colonp;
234 for (i = 1; i <= n; i++) {
235 endp[- i] = colonp[n - i];
241 memcpy(dst, tmp, NS_IN6ADDRSZ);
256 getbits(const char *src, int ipv6) {
260 if (*src == '\0') /*%< syntax */
264 cp = strchr(digits, ch);
265 if (cp == NULL) /*%< syntax */
269 if (bits == 0 && *src != '\0') /*%< no leading zeros */
271 if (bits > (ipv6 ? 128 : 32)) /*%< range error */
273 } while (*src != '\0');