/* Legacy IPv4 text-to-address functions. Copyright (C) 2019-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* * Copyright (c) 1983, 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Portions Copyright (c) 1993 by Digital Equipment Corporation. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies, and that * the name of Digital Equipment Corporation not be used in advertising or * publicity pertaining to distribution of the document or software without * specific, written prior permission. * * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. */ /* * Portions Copyright (c) 1996-1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. */ #include <sys/types.h> #include <sys/param.h> #include <netinet/in.h> #include <arpa/inet.h> #include <ctype.h> #include <endian.h> #include <stdint.h> #include <stdlib.h> #include <limits.h> #include <errno.h> /* Check whether "cp" is a valid ASCII representation of an IPv4 Internet address and convert it to a binary address. Returns 1 if the address is valid, 0 if not. This replaces inet_addr, the return value from which cannot distinguish between failure and a local broadcast address. Write a pointer to the first non-converted character to *endp. */ static int inet_aton_end (const char *cp, struct in_addr *addr, const char **endp) { static const in_addr_t max[4] = { 0xffffffff, 0xffffff, 0xffff, 0xff }; in_addr_t val; char c; union iaddr { uint8_t bytes[4]; uint32_t word; } res; uint8_t *pp = res.bytes; int digit; int saved_errno = errno; __set_errno (0); res.word = 0; c = *cp; for (;;) { /* Collect number up to ``.''. Values are specified as for C: 0x=hex, 0=octal, isdigit=decimal. */ if (!isdigit (c)) goto ret_0; { char *endp; unsigned long ul = strtoul (cp, &endp, 0); if (ul == ULONG_MAX && errno == ERANGE) goto ret_0; if (ul > 0xfffffffful) goto ret_0; val = ul; digit = cp != endp; cp = endp; } c = *cp; if (c == '.') { /* Internet format: a.b.c.d a.b.c (with c treated as 16 bits) a.b (with b treated as 24 bits). */ if (pp > res.bytes + 2 || val > 0xff) goto ret_0; *pp++ = val; c = *++cp; } else break; } /* Check for trailing characters. */ if (c != '\0' && (!isascii (c) || !isspace (c))) goto ret_0; /* Did we get a valid digit? */ if (!digit) goto ret_0; /* Check whether the last part is in its limits depending on the number of parts in total. */ if (val > max[pp - res.bytes]) goto ret_0; if (addr != NULL) addr->s_addr = res.word | htonl (val); *endp = cp; __set_errno (saved_errno); return 1; ret_0: __set_errno (saved_errno); return 0; } int __inet_aton_exact (const char *cp, struct in_addr *addr) { struct in_addr val; const char *endp; /* Check that inet_aton_end parsed the entire string. */ if (inet_aton_end (cp, &val, &endp) != 0 && *endp == 0) { *addr = val; return 1; } else return 0; } libc_hidden_def (__inet_aton_exact) /* inet_aton ignores trailing garbage. */ int __inet_aton_ignore_trailing (const char *cp, struct in_addr *addr) { const char *endp; return inet_aton_end (cp, addr, &endp); } weak_alias (__inet_aton_ignore_trailing, inet_aton) /* ASCII IPv4 Internet address interpretation routine. The value returned is in network order. */ in_addr_t __inet_addr (const char *cp) { struct in_addr val; const char *endp; if (inet_aton_end (cp, &val, &endp)) return val.s_addr; return INADDR_NONE; } weak_alias (__inet_addr, inet_addr)