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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley
* 4.3 BSD under license from the Regents of the University of
* California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Convert network-format internet address
* to base 256 d.d.d.d representation.
*
* Reentrant interface
*/
#pragma weak inet_aton = _inet_aton
#include "mt.h"
#include "rpc_mt.h"
#include <errno.h>
#include <sys/types.h>
#include <ctype.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
char *
inet_ntoa_r(in, b)
struct in_addr in;
char b[]; /* Assumed >= 18 bytes */
{
char *p;
p = (char *)∈
#define UC(b) (((int)b)&0xff)
(void) sprintf(b, "%d.%d.%d.%d",
UC(p[0]), UC(p[1]), UC(p[2]), UC(p[3]));
return (b);
}
char *
inet_ntoa(in)
struct in_addr in;
{
char *b;
static char b_main[18];
static pthread_key_t ntoa_key = PTHREAD_ONCE_KEY_NP;
if (thr_main())
b = b_main;
else if ((b = thr_get_storage(&ntoa_key, 18, free)) == NULL)
b = b_main;
return (inet_ntoa_r(in, b));
}
/*
* Check whether "cp" is a valid ascii representation
* of an Internet address and convert 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.
*/
int
inet_aton(const char *cp, struct in_addr *addr)
{
uint32_t val;
int base, n;
char c;
unsigned int parts[4];
unsigned int *pp = parts;
c = *cp;
for (;;) {
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, isdigit=decimal.
*/
if (!isdigit(c))
return (0);
val = 0; base = 10;
if (c == '0') {
c = *++cp;
if (c == 'x' || c == 'X')
base = 16, c = *++cp;
else
base = 8;
}
for (;;) {
if (isascii(c) && isdigit(c)) {
val = (val * base) + (c - '0');
c = *++cp;
} else if (base == 16 && isascii(c) && isxdigit(c)) {
val = (val << 4) |
(c + 10 - (islower(c) ? 'a' : 'A'));
c = *++cp;
} else
break;
}
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 >= parts + 3)
return (0);
*pp++ = val;
c = *++cp;
} else
break;
}
/*
* Check for trailing characters.
*/
if (c != '\0' && (!isascii(c) || !isspace(c)))
return (0);
/*
* Concoct the address according to
* the number of parts specified.
*/
n = pp - parts + 1;
switch (n) {
case 0:
return (0); /* initial nondigit */
case 1: /* a -- 32 bits */
break;
case 2: /* a.b -- 8.24 bits */
if ((val > 0xffffff) || (parts[0] > 0xff))
return (0);
val |= parts[0] << 24;
break;
case 3: /* a.b.c -- 8.8.16 bits */
if ((val > 0xffff) || (parts[0] > 0xff) || (parts[1] > 0xff))
return (0);
val |= (parts[0] << 24) | (parts[1] << 16);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
if ((val > 0xff) || (parts[0] > 0xff) || (parts[1] > 0xff) ||
(parts[2] > 0xff))
return (0);
val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
break;
}
if (addr)
addr->s_addr = htonl(val);
return (1);
}
/*
* Internet address interpretation routine.
* All the network library routines call this
* routine to interpret entries in the data bases
* which are expected to be an address.
* The value returned is in network order.
*/
in_addr_t
inet_addr(const char *cp)
{
struct in_addr val;
if (inet_aton(cp, &val))
return (val.s_addr);
return (INADDR_NONE);
}
/*
* Return the network number from an internet
* address; handles class a/b/c network #'s.
*/
uint_t
inet_netof(struct in_addr in)
{
uint32_t i = ntohl(in.s_addr);
if (IN_CLASSA(i))
return ((i & IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
if (IN_CLASSB(i))
return ((i & IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
return ((i & IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
}
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