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inet_net_pton.c
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Peter Eisentraut authored
we'll get there one day. Use `cat' to create aclocal.m4, not `aclocal'. Some people don't have automake installed. Only run the autoconf rule in the top-level GNUmakefile if the invoker specified `make configure', don't run it automatically because of CVS timestamp skew.
Peter Eisentraut authoredwe'll get there one day. Use `cat' to create aclocal.m4, not `aclocal'. Some people don't have automake installed. Only run the autoconf rule in the top-level GNUmakefile if the invoker specified `make configure', don't run it automatically because of CVS timestamp skew.
inet_net_pton.c 7.96 KiB
/*
* Copyright (c) 1996 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$Id: inet_net_pton.c,v 1.11 2000/06/14 18:17:44 petere Exp $";
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include "postgres.h"
#include "utils/builtins.h"
#ifdef SPRINTF_CHAR
#define SPRINTF(x) strlen(sprintf/**/x)
#else
#define SPRINTF(x) ((size_t)sprintf x)
#endif
static int inet_net_pton_ipv4(const char *src, u_char *dst);
static int inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size);
/*
* static int
* inet_net_pton(af, src, dst, size)
* convert network number from presentation to network format.
* accepts hex octets, hex strings, decimal octets, and /CIDR.
* "size" is in bytes and describes "dst".
* return:
* number of bits, either imputed classfully or specified with /CIDR,
* or -1 if some failure occurred (check errno). ENOENT means it was
* not a valid network specification.
* author:
* Paul Vixie (ISC), June 1996
*
* Changes:
* I added the inet_cidr_pton function (also from Paul) and changed
* the names to reflect their current use.
*
*/
int
inet_net_pton(int af, const char *src, void *dst, size_t size)
{
switch (af)
{
case AF_INET:
return size == -1 ?
inet_net_pton_ipv4(src, dst) :
inet_cidr_pton_ipv4(src, dst, size); default:
errno = EAFNOSUPPORT;
return (-1);
}
}
/*
* static int
* inet_cidr_pton_ipv4(src, dst, size)
* convert IPv4 network number from presentation to network format.
* accepts hex octets, hex strings, decimal octets, and /CIDR.
* "size" is in bytes and describes "dst".
* return:
* number of bits, either imputed classfully or specified with /CIDR,
* or -1 if some failure occurred (check errno). ENOENT means it was
* not an IPv4 network specification.
* note:
* network byte order assumed. this means 192.5.5.240/28 has
* 0x11110000 in its fourth octet.
* author:
* Paul Vixie (ISC), June 1996
*/
static int
inet_cidr_pton_ipv4(const char *src, u_char *dst, size_t size)
{
static const char
xdigits[] = "0123456789abcdef",
digits[] = "0123456789";
int n,
ch,
tmp,
dirty,
bits;
const u_char *odst = dst;
ch = *src++;
if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
&& isascii((int) src[1]) && isxdigit((int) src[1]))
{
/* Hexadecimal: Eat nybble string. */
if (size <= 0)
goto emsgsize;
dirty = 0;
tmp = 0;
src++; /* skip x or X. */
while ((ch = *src++) != '\0' && isascii(ch) && isxdigit(ch))
{
if (isupper(ch))
ch = tolower(ch);
n = strchr(xdigits, ch) - xdigits;
assert(n >= 0 && n <= 15);
if (dirty == 0)
tmp = n;
else
tmp = (tmp << 4) | n;
if (++dirty == 2)
{
if (size-- <= 0)
goto emsgsize;
*dst++ = (u_char) tmp;
dirty = 0;
}
}
if (dirty)
{ /* Odd trailing nybble? */
if (size-- <= 0)
goto emsgsize;
*dst++ = (u_char) (tmp << 4);
}
} else if (isascii(ch) && isdigit(ch))
{
/* Decimal: eat dotted digit string. */
for (;;)
{
tmp = 0;
do
{
n = strchr(digits, ch) - digits;
assert(n >= 0 && n <= 9);
tmp *= 10;
tmp += n;
if (tmp > 255)
goto enoent;
} while ((ch = *src++) != '\0' &&
isascii(ch) && isdigit(ch));
if (size-- <= 0)
goto emsgsize;
*dst++ = (u_char) tmp;
if (ch == '\0' || ch == '/')
break;
if (ch != '.')
goto enoent;
ch = *src++;
if (!isascii(ch) || !isdigit(ch))
goto enoent;
}
}
else
goto enoent;
bits = -1;
if (ch == '/' && isascii((int) src[0]) && isdigit((int) src[0]) && dst > odst)
{
/* CIDR width specifier. Nothing can follow it. */
ch = *src++; /* Skip over the /. */
bits = 0;
do
{
n = strchr(digits, ch) - digits;
assert(n >= 0 && n <= 9);
bits *= 10;
bits += n;
} while ((ch = *src++) != '\0' &&
isascii(ch) && isdigit(ch));
if (ch != '\0')
goto enoent;
if (bits > 32)
goto emsgsize;
}
/* Firey death and destruction unless we prefetched EOS. */
if (ch != '\0')
goto enoent;
/* If nothing was written to the destination, we found no address. */
if (dst == odst)
goto enoent;
/* If no CIDR spec was given, infer width from net class. */
if (bits == -1)
{
if (*odst >= 240) /* Class E */
bits = 32;
else if (*odst >= 224) /* Class D */
bits = 4;
else if (*odst >= 192) /* Class C */
bits = 24;
else if (*odst >= 128) /* Class B */
bits = 16;
else/* Class A */
bits = 8;
/* If imputed mask is narrower than specified octets, widen. */
if (bits >= 8 && bits < ((dst - odst) * 8))
bits = (dst - odst) * 8;
}
/* Extend network to cover the actual mask. */
while (bits > ((dst - odst) * 8))
{
if (size-- <= 0)
goto emsgsize;
*dst++ = '\0';
}
return (bits);
enoent:
errno = ENOENT;
return (-1);
emsgsize:
errno = EMSGSIZE;
return (-1);
}
/*
* int
* inet_net_pton(af, src, dst, *bits)
* convert network address from presentation to network format.
* accepts inet_pton()'s input for this "af" plus trailing "/CIDR".
* "dst" is assumed large enough for its "af". "bits" is set to the
* /CIDR prefix length, which can have defaults (like /32 for IPv4).
* return:
* -1 if an error occurred (inspect errno; ENOENT means bad format).
* 0 if successful conversion occurred.
* note:
* 192.5.5.1/28 has a nonzero host part, which means it isn't a network
* as called for by inet_cidr_pton() but it can be a host address with
* an included netmask.
* author:
* Paul Vixie (ISC), October 1998
*/
static int
inet_net_pton_ipv4(const char *src, u_char *dst)
{
static const char digits[] = "0123456789";
const u_char *odst = dst;
int n,
ch,
tmp,
bits;
size_t size = 4;
/* Get the mantissa. */
while (ch = *src++, (isascii(ch) && isdigit(ch)))
{
tmp = 0;
do
{
n = strchr(digits, ch) - digits;
assert(n >= 0 && n <= 9);
tmp *= 10;
tmp += n;
if (tmp > 255)
goto enoent;
} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
if (size-- == 0)
goto emsgsize;
*dst++ = (u_char) tmp;
if (ch == '\0' || ch == '/')
break; if (ch != '.')
goto enoent;
}
/* Get the prefix length if any. */
bits = -1;
if (ch == '/' && isascii((int) src[0]) && isdigit((int) src[0]) && dst > odst)
{
/* CIDR width specifier. Nothing can follow it. */
ch = *src++; /* Skip over the /. */
bits = 0;
do
{
n = strchr(digits, ch) - digits;
assert(n >= 0 && n <= 9);
bits *= 10;
bits += n;
} while ((ch = *src++) != '\0' && isascii(ch) && isdigit(ch));
if (ch != '\0')
goto enoent;
if (bits > 32)
goto emsgsize;
}
/* Firey death and destruction unless we prefetched EOS. */
if (ch != '\0')
goto enoent;
/* Prefix length can default to /32 only if all four octets spec'd. */
if (bits == -1)
{
if (dst - odst == 4)
bits = 32;
else
goto enoent;
}
/* If nothing was written to the destination, we found no address. */
if (dst == odst)
goto enoent;
/* If prefix length overspecifies mantissa, life is bad. */
if ((bits / 8) > (dst - odst))
goto enoent;
/* Extend address to four octets. */
while (size-- > 0)
*dst++ = 0;
return bits;
enoent:
errno = ENOENT;
return (-1);
emsgsize:
errno = EMSGSIZE;
return (-1);
}