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/*
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* 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/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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static int inet_net_pton_ipv4 (const char *src, u_char *dst,
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size_t size) __THROW;
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/*
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* static int
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* inet_net_pton(af, src, dst, size)
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* convert network number from presentation to network format.
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* accepts hex octets, hex strings, decimal octets, and /CIDR.
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* "size" is in bytes and describes "dst".
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* return:
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* number of bits, either imputed classfully or specified with /CIDR,
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* or -1 if some failure occurred (check errno). ENOENT means it was
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* not a valid network specification.
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* author:
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* Paul Vixie (ISC), June 1996
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*/
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int
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inet_net_pton (int af, const char *src, void *dst, size_t size)
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{
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switch (af) {
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case AF_INET:
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return (inet_net_pton_ipv4(src, dst, size));
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default:
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__set_errno (EAFNOSUPPORT);
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return (-1);
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}
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}
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/*
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* static int
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* inet_net_pton_ipv4(src, dst, size)
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* convert IPv4 network number from presentation to network format.
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* accepts hex octets, hex strings, decimal octets, and /CIDR.
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* "size" is in bytes and describes "dst".
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* return:
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* number of bits, either imputed classfully or specified with /CIDR,
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* or -1 if some failure occurred (check errno). ENOENT means it was
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* not an IPv4 network specification.
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* note:
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* author:
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* Paul Vixie (ISC), June 1996
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*/
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static int
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inet_net_pton_ipv4 (const char *src, u_char *dst, size_t size)
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{
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static const char xdigits[] = "0123456789abcdef";
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int n, ch, tmp, dirty, bits;
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const u_char *odst = dst;
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ch = *src++;
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if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
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&& isascii(src[1]) && isxdigit(src[1])) {
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/* Hexadecimal: Eat nybble string. */
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if (size <= 0)
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goto emsgsize;
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dirty = 0;
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tmp = 0; /* To calm down gcc. */
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src++; /* skip x or X. */
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while (isxdigit((ch = *src++))) {
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ch = _tolower(ch);
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n = (const char *) __rawmemchr(xdigits, ch) - xdigits;
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assert(n >= 0 && n <= 15);
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if (dirty == 0)
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tmp = n;
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else
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tmp = (tmp << 4) | n;
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if (++dirty == 2) {
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if (size-- <= 0)
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goto emsgsize;
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*dst++ = (u_char) tmp;
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dirty = 0;
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}
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}
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if (dirty) { /* Odd trailing nybble? */
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if (size-- <= 0)
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goto emsgsize;
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*dst++ = (u_char) (tmp << 4);
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}
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} else if (isascii(ch) && isdigit(ch)) {
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/* Decimal: eat dotted digit string. */
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for (;;) {
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tmp = 0;
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do {
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n = ((const char *) __rawmemchr(xdigits, ch)
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- xdigits);
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assert(n >= 0 && n <= 9);
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tmp *= 10;
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tmp += n;
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if (tmp > 255)
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goto enoent;
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} while (isascii((ch = *src++)) && isdigit(ch));
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if (size-- <= 0)
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goto emsgsize;
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*dst++ = (u_char) tmp;
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if (ch == '\0' || ch == '/')
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break;
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if (ch != '.')
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goto enoent;
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ch = *src++;
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if (!isascii(ch) || !isdigit(ch))
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goto enoent;
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}
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} else
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goto enoent;
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bits = -1;
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if (ch == '/' && isascii(src[0]) && isdigit(src[0]) && dst > odst) {
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/* CIDR width specifier. Nothing can follow it. */
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ch = *src++; /* Skip over the /. */
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bits = 0;
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do {
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n = (const char *) __rawmemchr(xdigits, ch) - xdigits;
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assert(n >= 0 && n <= 9);
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bits *= 10;
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bits += n;
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} while (isascii((ch = *src++)) && isdigit(ch));
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if (ch != '\0')
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goto enoent;
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if (bits > 32)
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goto emsgsize;
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}
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/* Firey death and destruction unless we prefetched EOS. */
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if (ch != '\0')
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goto enoent;
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/* If nothing was written to the destination, we found no address. */
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if (dst == odst)
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goto enoent;
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/* If no CIDR spec was given, infer width from net class. */
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if (bits == -1) {
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if (*odst >= 240) /* Class E */
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bits = 32;
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else if (*odst >= 224) /* Class D */
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bits = 4;
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else if (*odst >= 192) /* Class C */
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bits = 24;
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else if (*odst >= 128) /* Class B */
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bits = 16;
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else /* Class A */
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bits = 8;
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/* If imputed mask is narrower than specified octets, widen. */
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if (bits >= 8 && bits < ((dst - odst) * 8))
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bits = (dst - odst) * 8;
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6c4009 |
}
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/* Extend network to cover the actual mask. */
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while (bits > ((dst - odst) * 8)) {
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if (size-- <= 0)
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goto emsgsize;
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*dst++ = '\0';
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6c4009 |
}
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return (bits);
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6c4009 |
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enoent:
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__set_errno (ENOENT);
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6c4009 |
return (-1);
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6c4009 |
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6c4009 |
emsgsize:
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6c4009 |
__set_errno (EMSGSIZE);
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6c4009 |
return (-1);
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6c4009 |
}
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