2 * SPDX-License-Identifier: ISC
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1998,1999 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_cidr_pton.c,v 1.6 2005/04/27 04:56:19 sra Exp $";
23 #include <sys/cdefs.h>
24 __FBSDID("$FreeBSD$");
26 #include "port_before.h"
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <arpa/nameser.h>
32 #include <arpa/inet.h>
41 #include "port_after.h"
44 # define SPRINTF(x) strlen(sprintf/**/x)
46 # define SPRINTF(x) ((size_t)sprintf x)
49 static int inet_cidr_pton_ipv4 (const char *src, u_char *dst, int *bits,
51 static int inet_cidr_pton_ipv6 (const char *src, u_char *dst, int *bits);
53 static int getbits(const char *, int ipv6);
57 * inet_cidr_pton(af, src, dst, *bits)
58 * convert network address from presentation to network format.
59 * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
60 * "dst" is assumed large enough for its "af". "bits" is set to the
61 * /CIDR prefix length, which can have defaults (like /32 for IPv4).
63 * -1 if an error occurred (inspect errno; ENOENT means bad format).
64 * 0 if successful conversion occurred.
66 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
67 * as called for by inet_net_pton() but it can be a host address with
68 * an included netmask.
70 * Paul Vixie (ISC), October 1998
73 inet_cidr_pton(int af, const char *src, void *dst, int *bits) {
76 return (inet_cidr_pton_ipv4(src, dst, bits, 0));
78 return (inet_cidr_pton_ipv6(src, dst, bits));
85 static const char digits[] = "0123456789";
88 inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) {
89 const u_char *odst = dst;
93 /* Get the mantissa. */
94 while (ch = *src++, (isascii(ch) && isdigit(ch))) {
97 n = strchr(digits, ch) - digits;
98 assert(n >= 0 && n <= 9);
103 } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
106 *dst++ = (u_char) tmp;
107 if (ch == '\0' || ch == '/')
113 /* Get the prefix length if any. */
115 if (ch == '/' && dst > odst) {
116 bits = getbits(src, ipv6);
119 } else if (ch != '\0')
122 /* Prefix length can default to /32 only if all four octets spec'd. */
125 bits = ipv6 ? 128 : 32;
130 /* If nothing was written to the destination, we found no address. */
134 /* If prefix length overspecifies mantissa, life is bad. */
135 if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst))
138 /* Extend address to four octets. */
155 inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) {
156 static const char xdigits_l[] = "0123456789abcdef",
157 xdigits_u[] = "0123456789ABCDEF";
158 u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
159 const char *xdigits, *curtok;
164 memset((tp = tmp), '\0', NS_IN6ADDRSZ);
165 endp = tp + NS_IN6ADDRSZ;
167 /* Leading :: requires some special handling. */
175 while ((ch = *src++) != '\0') {
178 if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
179 pch = strchr((xdigits = xdigits_u), ch);
182 val |= (pch - xdigits);
195 } else if (*src == '\0') {
198 if (tp + NS_INT16SZ > endp)
200 *tp++ = (u_char) (val >> 8) & 0xff;
201 *tp++ = (u_char) val & 0xff;
206 if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
207 inet_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) {
210 break; /*%< '\\0' was seen by inet_pton4(). */
213 bits = getbits(src, 1);
221 if (tp + NS_INT16SZ > endp)
223 *tp++ = (u_char) (val >> 8) & 0xff;
224 *tp++ = (u_char) val & 0xff;
226 if (colonp != NULL) {
228 * Since some memmove()'s erroneously fail to handle
229 * overlapping regions, we'll do the shift by hand.
231 const int n = tp - colonp;
236 for (i = 1; i <= n; i++) {
237 endp[- i] = colonp[n - i];
243 memcpy(dst, tmp, NS_IN6ADDRSZ);
258 getbits(const char *src, int ipv6) {
262 if (*src == '\0') /*%< syntax */
266 cp = strchr(digits, ch);
267 if (cp == NULL) /*%< syntax */
271 if (bits == 0 && *src != '\0') /*%< no leading zeros */
273 if (bits > (ipv6 ? 128 : 32)) /*%< range error */
275 } while (*src != '\0');