/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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.
*
* src/backend/utils/adt/inet_net_pton.c
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: inet_net_pton.c,v 1.4.2.3 2004/03/17 00:40:11 marka Exp $";
#endif
#include "postgres.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <ctype.h>
#include "utils/builtins.h" /* pgrminclude ignore */ /* needed on some platforms */
#include "utils/inet.h"
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_ipv6(const char *src, u_char *dst);
static int inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size);
/*
* 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 PGSQL_AF_INET:
return size == -1 ?
inet_net_pton_ipv4(src, dst) :
inet_cidr_pton_ipv4(src, dst, size);
case PGSQL_AF_INET6:
return size == -1 ?
inet_net_pton_ipv6(src, dst) :
inet_cidr_pton_ipv6(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
* 0b11110000 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";
static const char digits[] = "0123456789";
int n,
ch,
tmp = 0,
dirty,
bits;
const u_char *odst = dst;
ch = *src++;
if (ch == '0' && (src[0] == 'x' || src[0] == 'X')
&& isxdigit((unsigned char) src[1]))
{
/* Hexadecimal: Eat nybble string. */
if (size <= 0U)
goto emsgsize;
dirty = 0;
src++; /* skip x or X. */
while ((ch = *src++) != '\0' && isxdigit((unsigned char) ch))
{
if (isupper((unsigned char) ch))
ch = tolower((unsigned char) 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-- <= 0U)
goto emsgsize;
*dst++ = (u_char) tmp;
dirty = 0;
}
}
if (dirty)
{ /* Odd trailing nybble? */
if (size-- <= 0U)
goto emsgsize;
*dst++ = (u_char) (tmp << 4);
}
}
else if (isdigit((unsigned char) 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' &&
isdigit((unsigned char) ch));
if (size-- <= 0U)
goto emsgsize;
*dst++ = (u_char) tmp;
if (ch == '\0' || ch == '/')
break;
if (ch != '.')
goto enoent;
ch = *src++;
if (!isdigit((unsigned char) ch))
goto enoent;
}
}
else
goto enoent;
bits = -1;
if (ch == '/' && isdigit((unsigned char) 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' && isdigit((unsigned char) 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 = 8;
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 < ((dst - odst) * 8))
bits = (dst - odst) * 8;
/*
* If there are no additional bits specified for a class D address
* adjust bits to 4.
*/
if (bits == 8 && *odst == 224)
bits = 4;
}
/* Extend network to cover the actual mask. */
while (bits > ((dst - odst) * 8))
{
if (size-- <= 0U)
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++, isdigit((unsigned char) 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' && isdigit((unsigned char) 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 == '/' && isdigit((unsigned char) 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' && isdigit((unsigned char) 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);
}
static int
getbits(const char *src, int *bitsp)
{
static const char digits[] = "0123456789";
int n;
int val;
char ch;
val = 0;
n = 0;
while ((ch = *src++) != '\0')
{
const char *pch;
pch = strchr(digits, ch);
if (pch != NULL)
{
if (n++ != 0 && val == 0) /* no leading zeros */
return (0);
val *= 10;
val += (pch - digits);
if (val > 128) /* range */
return (0);
continue;
}
return (0);
}
if (n == 0)
return (0);
*bitsp = val;
return (1);
}
static int
getv4(const char *src, u_char *dst, int *bitsp)
{
static const char digits[] = "0123456789";
u_char *odst = dst;
int n;
u_int val;
char ch;
val = 0;
n = 0;
while ((ch = *src++) != '\0')
{
const char *pch;
pch = strchr(digits, ch);
if (pch != NULL)
{
if (n++ != 0 && val == 0) /* no leading zeros */
return (0);
val *= 10;
val += (pch - digits);
if (val > 255) /* range */
return (0);
continue;
}
if (ch == '.' || ch == '/')
{
if (dst - odst > 3) /* too many octets? */
return (0);
*dst++ = val;
if (ch == '/')
return (getbits(src, bitsp));
val = 0;
n = 0;
continue;
}
return (0);
}
if (n == 0)
return (0);
if (dst - odst > 3) /* too many octets? */
return (0);
*dst++ = val;
return (1);
}
static int
inet_net_pton_ipv6(const char *src, u_char *dst)
{
return inet_cidr_pton_ipv6(src, dst, 16);
}
#define NS_IN6ADDRSZ 16
#define NS_INT16SZ 2
#define NS_INADDRSZ 4
static int
inet_cidr_pton_ipv6(const char *src, u_char *dst, size_t size)
{
static const char xdigits_l[] = "0123456789abcdef",
xdigits_u[] = "0123456789ABCDEF";
u_char tmp[NS_IN6ADDRSZ],
*tp,
*endp,
*colonp;
const char *xdigits,
*curtok;
int ch,
saw_xdigit;
u_int val;
int digits;
int bits;
if (size < NS_IN6ADDRSZ)
goto emsgsize;
memset((tp = tmp), '\0', NS_IN6ADDRSZ);
endp = tp + NS_IN6ADDRSZ;
colonp = NULL;
/* Leading :: requires some special handling. */
if (*src == ':')
if (*++src != ':')
goto enoent;
curtok = src;
saw_xdigit = 0;
val = 0;
digits = 0;
bits = -1;
while ((ch = *src++) != '\0')
{
const char *pch;
if ((pch = strchr((xdigits = xdigits_l), ch)) == NULL)
pch = strchr((xdigits = xdigits_u), ch);
if (pch != NULL)
{
val <<= 4;
val |= (pch - xdigits);
if (++digits > 4)
goto enoent;
saw_xdigit = 1;
continue;
}
if (ch == ':')
{
curtok = src;
if (!saw_xdigit)
{
if (colonp)
goto enoent;
colonp = tp;
continue;
}
else if (*src == '\0')
goto enoent;
if (tp + NS_INT16SZ > endp)
return (0);
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
saw_xdigit = 0;
digits = 0;
val = 0;
continue;
}
if (ch == '.' && ((tp + NS_INADDRSZ) <= endp) &&
getv4(curtok, tp, &bits) > 0)
{
tp += NS_INADDRSZ;
saw_xdigit = 0;
break; /* '\0' was seen by inet_pton4(). */
}
if (ch == '/' && getbits(src, &bits) > 0)
break;
goto enoent;
}
if (saw_xdigit)
{
if (tp + NS_INT16SZ > endp)
goto enoent;
*tp++ = (u_char) (val >> 8) & 0xff;
*tp++ = (u_char) val & 0xff;
}
if (bits == -1)
bits = 128;
endp = tmp + 16;
if (colonp != NULL)
{
/*
* Since some memmove()'s erroneously fail to handle overlapping
* regions, we'll do the shift by hand.
*/
const int n = tp - colonp;
int i;
if (tp == endp)
goto enoent;
for (i = 1; i <= n; i++)
{
endp[-i] = colonp[n - i];
colonp[n - i] = 0;
}
tp = endp;
}
if (tp != endp)
goto enoent;
/*
* Copy out the result.
*/
memcpy(dst, tmp, NS_IN6ADDRSZ);
return (bits);
enoent:
errno = ENOENT;
return (-1);
emsgsize:
errno = EMSGSIZE;
return (-1);
}