Annotation of embedaddon/ntp/lib/isc/inet_aton.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Portions Copyright (C) 2004, 2005, 2007, 2009 Internet Systems Consortium, Inc. ("ISC")
! 3: * Portions Copyright (C) 1996-2001 Internet Software Consortium.
! 4: *
! 5: * Permission to use, copy, modify, and/or 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.
! 8: *
! 9: * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
! 10: * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
! 11: * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
! 12: * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
! 13: * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
! 14: * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
! 15: * PERFORMANCE OF THIS SOFTWARE.
! 16: */
! 17:
! 18: /*
! 19: * Copyright (c) 1983, 1990, 1993
! 20: * The Regents of the University of California. All rights reserved.
! 21: *
! 22: * Redistribution and use in source and binary forms, with or without
! 23: * modification, are permitted provided that the following conditions
! 24: * are met:
! 25: * 1. Redistributions of source code must retain the above copyright
! 26: * notice, this list of conditions and the following disclaimer.
! 27: * 2. Redistributions in binary form must reproduce the above copyright
! 28: * notice, this list of conditions and the following disclaimer in the
! 29: * documentation and/or other materials provided with the distribution.
! 30: * 3. All advertising materials mentioning features or use of this software
! 31: * must display the following acknowledgement:
! 32: * This product includes software developed by the University of
! 33: * California, Berkeley and its contributors.
! 34: * 4. Neither the name of the University nor the names of its contributors
! 35: * may be used to endorse or promote products derived from this software
! 36: * without specific prior written permission.
! 37: *
! 38: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 39: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 40: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 41: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 42: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 43: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 44: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 45: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 46: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 47: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 48: * SUCH DAMAGE.
! 49: */
! 50:
! 51: /*
! 52: * Portions Copyright (c) 1993 by Digital Equipment Corporation.
! 53: *
! 54: * Permission to use, copy, modify, and distribute this software for any
! 55: * purpose with or without fee is hereby granted, provided that the above
! 56: * copyright notice and this permission notice appear in all copies, and that
! 57: * the name of Digital Equipment Corporation not be used in advertising or
! 58: * publicity pertaining to distribution of the document or software without
! 59: * specific, written prior permission.
! 60: *
! 61: * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
! 62: * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
! 63: * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
! 64: * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
! 65: * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
! 66: * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
! 67: * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
! 68: * SOFTWARE.
! 69: */
! 70: /*! \file */
! 71:
! 72: #if defined(LIBC_SCCS) && !defined(lint)
! 73: static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
! 74: static char rcsid[] = "$Id: inet_aton.c,v 1.21.332.2 2009/03/05 23:47:03 tbox Exp $";
! 75: #endif /* LIBC_SCCS and not lint */
! 76:
! 77: #include <config.h>
! 78:
! 79: #include <ctype.h>
! 80: #include <stddef.h> /* Required for NULL. */
! 81:
! 82: #include <isc/types.h>
! 83: #include <isc/net.h>
! 84:
! 85: /*%
! 86: * Check whether "cp" is a valid ascii representation
! 87: * of an Internet address and convert to a binary address.
! 88: * Returns 1 if the address is valid, 0 if not.
! 89: * This replaces inet_addr, the return value from which
! 90: * cannot distinguish between failure and a local broadcast address.
! 91: */
! 92: int
! 93: isc_net_aton(const char *cp, struct in_addr *addr) {
! 94: unsigned long val;
! 95: int base, n;
! 96: unsigned char c;
! 97: isc_uint8_t parts[4];
! 98: isc_uint8_t *pp = parts;
! 99: int digit;
! 100:
! 101: c = *cp;
! 102: for (;;) {
! 103: /*
! 104: * Collect number up to ``.''.
! 105: * Values are specified as for C:
! 106: * 0x=hex, 0=octal, isdigit=decimal.
! 107: */
! 108: if (!isdigit(c & 0xff))
! 109: return (0);
! 110: val = 0; base = 10; digit = 0;
! 111: if (c == '0') {
! 112: c = *++cp;
! 113: if (c == 'x' || c == 'X')
! 114: base = 16, c = *++cp;
! 115: else {
! 116: base = 8;
! 117: digit = 1;
! 118: }
! 119: }
! 120: for (;;) {
! 121: /*
! 122: * isascii() is valid for all integer values, and
! 123: * when it is true, c is known to be in scope
! 124: * for isdigit(). No cast necessary. Similar
! 125: * comment applies for later ctype uses.
! 126: */
! 127: if (isascii(c) && isdigit(c)) {
! 128: if (base == 8 && (c == '8' || c == '9'))
! 129: return (0);
! 130: val = (val * base) + (c - '0');
! 131: c = *++cp;
! 132: digit = 1;
! 133: } else if (base == 16 && isascii(c) && isxdigit(c)) {
! 134: val = (val << 4) |
! 135: (c + 10 - (islower(c) ? 'a' : 'A'));
! 136: c = *++cp;
! 137: digit = 1;
! 138: } else
! 139: break;
! 140: }
! 141: if (c == '.') {
! 142: /*
! 143: * Internet format:
! 144: * a.b.c.d
! 145: * a.b.c (with c treated as 16 bits)
! 146: * a.b (with b treated as 24 bits)
! 147: */
! 148: if (pp >= parts + 3 || val > 0xffU)
! 149: return (0);
! 150: *pp++ = (isc_uint8_t)val;
! 151: c = *++cp;
! 152: } else
! 153: break;
! 154: }
! 155: /*
! 156: * Check for trailing characters.
! 157: */
! 158: if (c != '\0' && (!isascii(c) || !isspace(c)))
! 159: return (0);
! 160: /*
! 161: * Did we get a valid digit?
! 162: */
! 163: if (!digit)
! 164: return (0);
! 165: /*
! 166: * Concoct the address according to
! 167: * the number of parts specified.
! 168: */
! 169: n = pp - parts + 1;
! 170: switch (n) {
! 171: case 1: /* a -- 32 bits */
! 172: break;
! 173:
! 174: case 2: /* a.b -- 8.24 bits */
! 175: if (val > 0xffffffU)
! 176: return (0);
! 177: val |= parts[0] << 24;
! 178: break;
! 179:
! 180: case 3: /* a.b.c -- 8.8.16 bits */
! 181: if (val > 0xffffU)
! 182: return (0);
! 183: val |= (parts[0] << 24) | (parts[1] << 16);
! 184: break;
! 185:
! 186: case 4: /* a.b.c.d -- 8.8.8.8 bits */
! 187: if (val > 0xffU)
! 188: return (0);
! 189: val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
! 190: break;
! 191: }
! 192: if (addr != NULL)
! 193: addr->s_addr = htonl(val);
! 194:
! 195: return (1);
! 196: }
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