17c478bd9Sstevel@tonic-gate /*
2*9525b14bSRao Shoaib * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
37c478bd9Sstevel@tonic-gate * Copyright (c) 1998,1999 by Internet Software Consortium.
47c478bd9Sstevel@tonic-gate *
57c478bd9Sstevel@tonic-gate * Permission to use, copy, modify, and distribute this software for any
67c478bd9Sstevel@tonic-gate * purpose with or without fee is hereby granted, provided that the above
77c478bd9Sstevel@tonic-gate * copyright notice and this permission notice appear in all copies.
87c478bd9Sstevel@tonic-gate *
9*9525b14bSRao Shoaib * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10*9525b14bSRao Shoaib * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*9525b14bSRao Shoaib * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
12*9525b14bSRao Shoaib * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*9525b14bSRao Shoaib * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*9525b14bSRao Shoaib * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15*9525b14bSRao Shoaib * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
167c478bd9Sstevel@tonic-gate */
177c478bd9Sstevel@tonic-gate
187c478bd9Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint)
19*9525b14bSRao Shoaib static const char rcsid[] = "$Id: inet_cidr_pton.c,v 1.6 2005/04/27 04:56:19 sra Exp $";
207c478bd9Sstevel@tonic-gate #endif
217c478bd9Sstevel@tonic-gate
227c478bd9Sstevel@tonic-gate #include "port_before.h"
237c478bd9Sstevel@tonic-gate
247c478bd9Sstevel@tonic-gate #include <sys/types.h>
257c478bd9Sstevel@tonic-gate #include <sys/socket.h>
267c478bd9Sstevel@tonic-gate #include <netinet/in.h>
277c478bd9Sstevel@tonic-gate #include <arpa/nameser.h>
287c478bd9Sstevel@tonic-gate #include <arpa/inet.h>
297c478bd9Sstevel@tonic-gate
307c478bd9Sstevel@tonic-gate #include <isc/assertions.h>
317c478bd9Sstevel@tonic-gate #include <ctype.h>
327c478bd9Sstevel@tonic-gate #include <errno.h>
337c478bd9Sstevel@tonic-gate #include <stdio.h>
347c478bd9Sstevel@tonic-gate #include <string.h>
357c478bd9Sstevel@tonic-gate #include <stdlib.h>
367c478bd9Sstevel@tonic-gate
377c478bd9Sstevel@tonic-gate #include "port_after.h"
387c478bd9Sstevel@tonic-gate
397c478bd9Sstevel@tonic-gate #ifdef SPRINTF_CHAR
407c478bd9Sstevel@tonic-gate # define SPRINTF(x) strlen(sprintf/**/x)
417c478bd9Sstevel@tonic-gate #else
427c478bd9Sstevel@tonic-gate # define SPRINTF(x) ((size_t)sprintf x)
437c478bd9Sstevel@tonic-gate #endif
447c478bd9Sstevel@tonic-gate
457c478bd9Sstevel@tonic-gate static int inet_cidr_pton_ipv4 __P((const char *src, u_char *dst,
467c478bd9Sstevel@tonic-gate int *bits, int ipv6));
477c478bd9Sstevel@tonic-gate static int inet_cidr_pton_ipv6 __P((const char *src, u_char *dst,
487c478bd9Sstevel@tonic-gate int *bits));
497c478bd9Sstevel@tonic-gate
507c478bd9Sstevel@tonic-gate static int getbits(const char *, int ipv6);
517c478bd9Sstevel@tonic-gate
52*9525b14bSRao Shoaib /*%
537c478bd9Sstevel@tonic-gate * int
547c478bd9Sstevel@tonic-gate * inet_cidr_pton(af, src, dst, *bits)
557c478bd9Sstevel@tonic-gate * convert network address from presentation to network format.
567c478bd9Sstevel@tonic-gate * accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
577c478bd9Sstevel@tonic-gate * "dst" is assumed large enough for its "af". "bits" is set to the
587c478bd9Sstevel@tonic-gate * /CIDR prefix length, which can have defaults (like /32 for IPv4).
597c478bd9Sstevel@tonic-gate * return:
607c478bd9Sstevel@tonic-gate * -1 if an error occurred (inspect errno; ENOENT means bad format).
617c478bd9Sstevel@tonic-gate * 0 if successful conversion occurred.
627c478bd9Sstevel@tonic-gate * note:
637c478bd9Sstevel@tonic-gate * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
647c478bd9Sstevel@tonic-gate * as called for by inet_net_pton() but it can be a host address with
657c478bd9Sstevel@tonic-gate * an included netmask.
667c478bd9Sstevel@tonic-gate * author:
677c478bd9Sstevel@tonic-gate * Paul Vixie (ISC), October 1998
687c478bd9Sstevel@tonic-gate */
697c478bd9Sstevel@tonic-gate int
inet_cidr_pton(int af,const char * src,void * dst,int * bits)707c478bd9Sstevel@tonic-gate inet_cidr_pton(int af, const char *src, void *dst, int *bits) {
717c478bd9Sstevel@tonic-gate switch (af) {
727c478bd9Sstevel@tonic-gate case AF_INET:
737c478bd9Sstevel@tonic-gate return (inet_cidr_pton_ipv4(src, dst, bits, 0));
747c478bd9Sstevel@tonic-gate case AF_INET6:
757c478bd9Sstevel@tonic-gate return (inet_cidr_pton_ipv6(src, dst, bits));
767c478bd9Sstevel@tonic-gate default:
777c478bd9Sstevel@tonic-gate errno = EAFNOSUPPORT;
787c478bd9Sstevel@tonic-gate return (-1);
797c478bd9Sstevel@tonic-gate }
807c478bd9Sstevel@tonic-gate }
817c478bd9Sstevel@tonic-gate
827c478bd9Sstevel@tonic-gate static const char digits[] = "0123456789";
837c478bd9Sstevel@tonic-gate
847c478bd9Sstevel@tonic-gate static int
inet_cidr_pton_ipv4(const char * src,u_char * dst,int * pbits,int ipv6)857c478bd9Sstevel@tonic-gate inet_cidr_pton_ipv4(const char *src, u_char *dst, int *pbits, int ipv6) {
867c478bd9Sstevel@tonic-gate const u_char *odst = dst;
877c478bd9Sstevel@tonic-gate int n, ch, tmp, bits;
887c478bd9Sstevel@tonic-gate size_t size = 4;
897c478bd9Sstevel@tonic-gate
907c478bd9Sstevel@tonic-gate /* Get the mantissa. */
917c478bd9Sstevel@tonic-gate while (ch = *src++, (isascii(ch) && isdigit(ch))) {
927c478bd9Sstevel@tonic-gate tmp = 0;
937c478bd9Sstevel@tonic-gate do {
947c478bd9Sstevel@tonic-gate n = strchr(digits, ch) - digits;
957c478bd9Sstevel@tonic-gate INSIST(n >= 0 && n <= 9);
967c478bd9Sstevel@tonic-gate tmp *= 10;
977c478bd9Sstevel@tonic-gate tmp += n;
987c478bd9Sstevel@tonic-gate if (tmp > 255)
997c478bd9Sstevel@tonic-gate goto enoent;
1007c478bd9Sstevel@tonic-gate } while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
101*9525b14bSRao Shoaib if (size-- == 0U)
1027c478bd9Sstevel@tonic-gate goto emsgsize;
1037c478bd9Sstevel@tonic-gate *dst++ = (u_char) tmp;
1047c478bd9Sstevel@tonic-gate if (ch == '\0' || ch == '/')
1057c478bd9Sstevel@tonic-gate break;
1067c478bd9Sstevel@tonic-gate if (ch != '.')
1077c478bd9Sstevel@tonic-gate goto enoent;
1087c478bd9Sstevel@tonic-gate }
1097c478bd9Sstevel@tonic-gate
1107c478bd9Sstevel@tonic-gate /* Get the prefix length if any. */
1117c478bd9Sstevel@tonic-gate bits = -1;
1127c478bd9Sstevel@tonic-gate if (ch == '/' && dst > odst) {
1137c478bd9Sstevel@tonic-gate bits = getbits(src, ipv6);
1147c478bd9Sstevel@tonic-gate if (bits == -2)
1157c478bd9Sstevel@tonic-gate goto enoent;
1167c478bd9Sstevel@tonic-gate } else if (ch != '\0')
1177c478bd9Sstevel@tonic-gate goto enoent;
1187c478bd9Sstevel@tonic-gate
1197c478bd9Sstevel@tonic-gate /* Prefix length can default to /32 only if all four octets spec'd. */
1207c478bd9Sstevel@tonic-gate if (bits == -1) {
1217c478bd9Sstevel@tonic-gate if (dst - odst == 4)
1227c478bd9Sstevel@tonic-gate bits = ipv6 ? 128 : 32;
1237c478bd9Sstevel@tonic-gate else
1247c478bd9Sstevel@tonic-gate goto enoent;
1257c478bd9Sstevel@tonic-gate }
1267c478bd9Sstevel@tonic-gate
1277c478bd9Sstevel@tonic-gate /* If nothing was written to the destination, we found no address. */
1287c478bd9Sstevel@tonic-gate if (dst == odst)
1297c478bd9Sstevel@tonic-gate goto enoent;
1307c478bd9Sstevel@tonic-gate
1317c478bd9Sstevel@tonic-gate /* If prefix length overspecifies mantissa, life is bad. */
1327c478bd9Sstevel@tonic-gate if (((bits - (ipv6 ? 96 : 0)) / 8) > (dst - odst))
1337c478bd9Sstevel@tonic-gate goto enoent;
1347c478bd9Sstevel@tonic-gate
1357c478bd9Sstevel@tonic-gate /* Extend address to four octets. */
136*9525b14bSRao Shoaib while (size-- > 0U)
1377c478bd9Sstevel@tonic-gate *dst++ = 0;
1387c478bd9Sstevel@tonic-gate
1397c478bd9Sstevel@tonic-gate *pbits = bits;
1407c478bd9Sstevel@tonic-gate return (0);
1417c478bd9Sstevel@tonic-gate
1427c478bd9Sstevel@tonic-gate enoent:
1437c478bd9Sstevel@tonic-gate errno = ENOENT;
1447c478bd9Sstevel@tonic-gate return (-1);
1457c478bd9Sstevel@tonic-gate
1467c478bd9Sstevel@tonic-gate emsgsize:
1477c478bd9Sstevel@tonic-gate errno = EMSGSIZE;
1487c478bd9Sstevel@tonic-gate return (-1);
1497c478bd9Sstevel@tonic-gate }
1507c478bd9Sstevel@tonic-gate
1517c478bd9Sstevel@tonic-gate static int
inet_cidr_pton_ipv6(const char * src,u_char * dst,int * pbits)1527c478bd9Sstevel@tonic-gate inet_cidr_pton_ipv6(const char *src, u_char *dst, int *pbits) {
1537c478bd9Sstevel@tonic-gate static const char xdigits_l[] = "0123456789abcdef",
1547c478bd9Sstevel@tonic-gate xdigits_u[] = "0123456789ABCDEF";
1557c478bd9Sstevel@tonic-gate u_char tmp[NS_IN6ADDRSZ], *tp, *endp, *colonp;
1567c478bd9Sstevel@tonic-gate const char *xdigits, *curtok;
1577c478bd9Sstevel@tonic-gate int ch, saw_xdigit;
1587c478bd9Sstevel@tonic-gate u_int val;
1597c478bd9Sstevel@tonic-gate int bits;
1607c478bd9Sstevel@tonic-gate
1617c478bd9Sstevel@tonic-gate memset((tp = tmp), '\0', NS_IN6ADDRSZ);
1627c478bd9Sstevel@tonic-gate endp = tp + NS_IN6ADDRSZ;
1637c478bd9Sstevel@tonic-gate colonp = NULL;
1647c478bd9Sstevel@tonic-gate /* Leading :: requires some special handling. */
1657c478bd9Sstevel@tonic-gate if (*src == ':')
1667c478bd9Sstevel@tonic-gate if (*++src != ':')
1677c478bd9Sstevel@tonic-gate return (0);
1687c478bd9Sstevel@tonic-gate curtok = src;
1697c478bd9Sstevel@tonic-gate saw_xdigit = 0;
1707c478bd9Sstevel@tonic-gate val = 0;
1717c478bd9Sstevel@tonic-gate bits = -1;
1727c478bd9Sstevel@tonic-gate while ((ch = *src++) != '\0') {
1737c478bd9Sstevel@tonic-gate const char *pch;
1747c478bd9Sstevel@tonic-gate
1757c478bd9Sstevel@tonic-gate if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
1767c478bd9Sstevel@tonic-gate pch = strchr((xdigits = xdigits_u), ch);
1777c478bd9Sstevel@tonic-gate if (pch != NULL) {
1787c478bd9Sstevel@tonic-gate val <<= 4;
1797c478bd9Sstevel@tonic-gate val |= (pch - xdigits);
1807c478bd9Sstevel@tonic-gate if (val > 0xffff)
1817c478bd9Sstevel@tonic-gate return (0);
1827c478bd9Sstevel@tonic-gate saw_xdigit = 1;
1837c478bd9Sstevel@tonic-gate continue;
1847c478bd9Sstevel@tonic-gate }
1857c478bd9Sstevel@tonic-gate if (ch == ':') {
1867c478bd9Sstevel@tonic-gate curtok = src;
1877c478bd9Sstevel@tonic-gate if (!saw_xdigit) {
1887c478bd9Sstevel@tonic-gate if (colonp)
1897c478bd9Sstevel@tonic-gate return (0);
1907c478bd9Sstevel@tonic-gate colonp = tp;
1917c478bd9Sstevel@tonic-gate continue;
1927c478bd9Sstevel@tonic-gate } else if (*src == '\0') {
1937c478bd9Sstevel@tonic-gate return (0);
1947c478bd9Sstevel@tonic-gate }
1957c478bd9Sstevel@tonic-gate if (tp + NS_INT16SZ > endp)
1967c478bd9Sstevel@tonic-gate return (0);
1977c478bd9Sstevel@tonic-gate *tp++ = (u_char) (val >> 8) & 0xff;
1987c478bd9Sstevel@tonic-gate *tp++ = (u_char) val & 0xff;
1997c478bd9Sstevel@tonic-gate saw_xdigit = 0;
2007c478bd9Sstevel@tonic-gate val = 0;
2017c478bd9Sstevel@tonic-gate continue;
2027c478bd9Sstevel@tonic-gate }
2037c478bd9Sstevel@tonic-gate if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
2047c478bd9Sstevel@tonic-gate inet_cidr_pton_ipv4(curtok, tp, &bits, 1) == 0) {
2057c478bd9Sstevel@tonic-gate tp += NS_INADDRSZ;
2067c478bd9Sstevel@tonic-gate saw_xdigit = 0;
207*9525b14bSRao Shoaib break; /*%< '\\0' was seen by inet_pton4(). */
2087c478bd9Sstevel@tonic-gate }
2097c478bd9Sstevel@tonic-gate if (ch == '/') {
2107c478bd9Sstevel@tonic-gate bits = getbits(src, 1);
2117c478bd9Sstevel@tonic-gate if (bits == -2)
2127c478bd9Sstevel@tonic-gate goto enoent;
2137c478bd9Sstevel@tonic-gate break;
2147c478bd9Sstevel@tonic-gate }
2157c478bd9Sstevel@tonic-gate goto enoent;
2167c478bd9Sstevel@tonic-gate }
2177c478bd9Sstevel@tonic-gate if (saw_xdigit) {
2187c478bd9Sstevel@tonic-gate if (tp + NS_INT16SZ > endp)
2197c478bd9Sstevel@tonic-gate goto emsgsize;
2207c478bd9Sstevel@tonic-gate *tp++ = (u_char) (val >> 8) & 0xff;
2217c478bd9Sstevel@tonic-gate *tp++ = (u_char) val & 0xff;
2227c478bd9Sstevel@tonic-gate }
2237c478bd9Sstevel@tonic-gate if (colonp != NULL) {
2247c478bd9Sstevel@tonic-gate /*
2257c478bd9Sstevel@tonic-gate * Since some memmove()'s erroneously fail to handle
2267c478bd9Sstevel@tonic-gate * overlapping regions, we'll do the shift by hand.
2277c478bd9Sstevel@tonic-gate */
2287c478bd9Sstevel@tonic-gate const int n = tp - colonp;
2297c478bd9Sstevel@tonic-gate int i;
2307c478bd9Sstevel@tonic-gate
2317c478bd9Sstevel@tonic-gate if (tp == endp)
2327c478bd9Sstevel@tonic-gate goto enoent;
2337c478bd9Sstevel@tonic-gate for (i = 1; i <= n; i++) {
2347c478bd9Sstevel@tonic-gate endp[- i] = colonp[n - i];
2357c478bd9Sstevel@tonic-gate colonp[n - i] = 0;
2367c478bd9Sstevel@tonic-gate }
2377c478bd9Sstevel@tonic-gate tp = endp;
2387c478bd9Sstevel@tonic-gate }
2397c478bd9Sstevel@tonic-gate
2407c478bd9Sstevel@tonic-gate memcpy(dst, tmp, NS_IN6ADDRSZ);
2417c478bd9Sstevel@tonic-gate
2427c478bd9Sstevel@tonic-gate *pbits = bits;
2437c478bd9Sstevel@tonic-gate return (0);
2447c478bd9Sstevel@tonic-gate
2457c478bd9Sstevel@tonic-gate enoent:
2467c478bd9Sstevel@tonic-gate errno = ENOENT;
2477c478bd9Sstevel@tonic-gate return (-1);
2487c478bd9Sstevel@tonic-gate
2497c478bd9Sstevel@tonic-gate emsgsize:
2507c478bd9Sstevel@tonic-gate errno = EMSGSIZE;
2517c478bd9Sstevel@tonic-gate return (-1);
2527c478bd9Sstevel@tonic-gate }
2537c478bd9Sstevel@tonic-gate
254*9525b14bSRao Shoaib static int
getbits(const char * src,int ipv6)2557c478bd9Sstevel@tonic-gate getbits(const char *src, int ipv6) {
2567c478bd9Sstevel@tonic-gate int bits = 0;
2577c478bd9Sstevel@tonic-gate char *cp, ch;
2587c478bd9Sstevel@tonic-gate
259*9525b14bSRao Shoaib if (*src == '\0') /*%< syntax */
2607c478bd9Sstevel@tonic-gate return (-2);
2617c478bd9Sstevel@tonic-gate do {
2627c478bd9Sstevel@tonic-gate ch = *src++;
2637c478bd9Sstevel@tonic-gate cp = strchr(digits, ch);
264*9525b14bSRao Shoaib if (cp == NULL) /*%< syntax */
2657c478bd9Sstevel@tonic-gate return (-2);
2667c478bd9Sstevel@tonic-gate bits *= 10;
2677c478bd9Sstevel@tonic-gate bits += cp - digits;
268*9525b14bSRao Shoaib if (bits == 0 && *src != '\0') /*%< no leading zeros */
2697c478bd9Sstevel@tonic-gate return (-2);
270*9525b14bSRao Shoaib if (bits > (ipv6 ? 128 : 32)) /*%< range error */
2717c478bd9Sstevel@tonic-gate return (-2);
2727c478bd9Sstevel@tonic-gate } while (*src != '\0');
2737c478bd9Sstevel@tonic-gate
2747c478bd9Sstevel@tonic-gate return (bits);
2757c478bd9Sstevel@tonic-gate }
276*9525b14bSRao Shoaib
277*9525b14bSRao Shoaib /*! \file */
278