218 lines
7.1 KiB
C
218 lines
7.1 KiB
C
/* Legacy IPv4 text-to-address functions.
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Copyright (C) 2019-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/*
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* Copyright (c) 1983, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <endian.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <errno.h>
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/* Check whether "cp" is a valid ASCII representation of an IPv4
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Internet address and convert it to a binary address. Returns 1 if
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the address is valid, 0 if not. This replaces inet_addr, the
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return value from which cannot distinguish between failure and a
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local broadcast address. Write a pointer to the first
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non-converted character to *endp. */
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static int
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inet_aton_end (const char *cp, struct in_addr *addr, const char **endp)
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{
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static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff };
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in_addr_t val;
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char c;
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union iaddr
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{
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uint8_t bytes[4];
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uint32_t word;
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} res;
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uint8_t *pp = res.bytes;
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int digit;
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int saved_errno = errno;
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__set_errno (0);
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res.word = 0;
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c = *cp;
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for (;;)
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{
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/* Collect number up to ``.''. Values are specified as for C:
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0x=hex, 0=octal, isdigit=decimal. */
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if (!isdigit (c))
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goto ret_0;
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{
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char *endp;
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unsigned long ul = strtoul (cp, &endp, 0);
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if (ul == ULONG_MAX && errno == ERANGE)
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goto ret_0;
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if (ul > 0xfffffffful)
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goto ret_0;
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val = ul;
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digit = cp != endp;
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cp = endp;
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}
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c = *cp;
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if (c == '.')
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{
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/* Internet format:
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a.b.c.d
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a.b.c (with c treated as 16 bits)
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a.b (with b treated as 24 bits). */
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if (pp > res.bytes + 2 || val > 0xff)
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goto ret_0;
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*pp++ = val;
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c = *++cp;
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}
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else
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break;
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}
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/* Check for trailing characters. */
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if (c != '\0' && (!isascii (c) || !isspace (c)))
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goto ret_0;
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/* Did we get a valid digit? */
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if (!digit)
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goto ret_0;
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/* Check whether the last part is in its limits depending on the
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number of parts in total. */
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if (val > max[pp - res.bytes])
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goto ret_0;
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if (addr != NULL)
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addr->s_addr = res.word | htonl (val);
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*endp = cp;
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__set_errno (saved_errno);
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return 1;
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ret_0:
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__set_errno (saved_errno);
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return 0;
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}
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int
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__inet_aton_exact (const char *cp, struct in_addr *addr)
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{
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struct in_addr val;
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const char *endp;
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/* Check that inet_aton_end parsed the entire string. */
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if (inet_aton_end (cp, &val, &endp) != 0 && *endp == 0)
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{
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*addr = val;
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return 1;
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}
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else
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return 0;
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}
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libc_hidden_def (__inet_aton_exact)
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/* inet_aton ignores trailing garbage. */
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int
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__inet_aton_ignore_trailing (const char *cp, struct in_addr *addr)
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{
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const char *endp;
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return inet_aton_end (cp, addr, &endp);
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}
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weak_alias (__inet_aton_ignore_trailing, inet_aton)
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/* ASCII IPv4 Internet address interpretation routine. The value
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returned is in network order. */
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in_addr_t
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__inet_addr (const char *cp)
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{
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struct in_addr val;
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const char *endp;
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if (inet_aton_end (cp, &val, &endp))
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return val.s_addr;
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return INADDR_NONE;
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}
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weak_alias (__inet_addr, inet_addr)
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