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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2002-2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/salib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/bootvfs.h>
#include <netinet/in.h>
/*
* This structure defines the static area where gethostbyname()
* stores the hostent data that it returns to the caller.
*/
static struct {
struct hostent he;
in_addr_t *ha_list[2];
in_addr_t ha_addr;
char ha_name[MAXHOSTNAMELEN+1];
} hostinfo;
int h_errno;
static in_addr_t inet_addr(const char *);
static in_addr_t nam2addr(const char *);
/* Very stripped-down gethostbyname() */
struct hostent *
gethostbyname(const char *nam)
{
bzero(&hostinfo, sizeof (hostinfo));
hostinfo.ha_addr = inet_addr(nam);
if ((int32_t)hostinfo.ha_addr == -1) {
if (get_default_fs() == NULL) {
h_errno = HOST_NOT_FOUND;
return (NULL);
}
hostinfo.ha_addr = nam2addr(nam);
if ((int32_t)hostinfo.ha_addr == -1) {
h_errno = HOST_NOT_FOUND;
return (NULL);
}
}
hostinfo.he.h_addrtype = AF_INET;
(void) strlcpy(hostinfo.ha_name, nam, MAXHOSTNAMELEN);
hostinfo.he.h_name = hostinfo.ha_name;
hostinfo.he.h_length = sizeof (struct in_addr);
hostinfo.ha_list[0] = &hostinfo.ha_addr;
hostinfo.he.h_addr_list = (char **)&hostinfo.ha_list;
return (&hostinfo.he);
}
#define SKIP_SPACE(_p) \
{ \
char _c; \
while ((_c = *(_p)) != '\0' && isspace(_c)) \
p++; \
if (_c == '\0') \
goto next_line; \
}
#define SKIP_TOKEN(_p) \
{ \
char _c; \
while ((_c = *(_p)) != '\0' && !isspace(_c)) \
p++; \
if (_c == '\0') \
goto next_line; \
}
#define TRIM_LINE(_l) \
{ \
char _c, *_p = (_l); \
while ((_c = *_p) != '#' && _c != '\n' && _c != '\0') \
_p++; \
*_p = '\0'; \
}
#define BUFSZ 1024
#define HOSTDB "/etc/inet/hosts"
static in_addr_t
nam2addr(const char *nam)
{
FILE *h;
char c, buf[BUFSZ];
char *l, *p, *s;
boolean_t first_token;
if ((h = fopen(HOSTDB, "r")) == NULL) {
return ((in_addr_t)-1);
}
next_line:
if ((l = fgets(buf, BUFSZ, h)) == NULL) {
(void) fclose(h);
return ((in_addr_t)-1);
}
TRIM_LINE(l);
p = l;
first_token = B_TRUE;
next_token:
SKIP_SPACE(p);
if (first_token) {
first_token = B_FALSE;
SKIP_TOKEN(p);
*p++ = '\0';
goto next_token;
}
s = (char *)nam;
if (*p++ == *s++) {
while ((c = *s++) == *p && c != '\0')
p++;
if (c == '\0' && (isspace(*p) || *p == '\0'))
goto match;
}
SKIP_TOKEN(p);
goto next_token;
match:
(void) fclose(h);
return (inet_addr((const char *)l));
}
static in_addr_t
inet_addr(const char *cp)
{
in_addr_t val;
uint_t base, n;
char c;
in_addr_t parts[4], *pp = parts;
again:
/*
* Collect number up to ``.''.
* Values are specified as for C:
* 0x=hex, 0=octal, other=decimal.
*/
val = 0; base = 10;
if (*cp == '0') {
if (*++cp == 'x' || *cp == 'X')
base = 16, cp++;
else
base = 8;
}
while ((c = *cp) != 0) {
if (isdigit(c)) {
if ((c - '0') >= base)
break;
val = (val * base) + (c - '0');
cp++;
continue;
}
if (base == 16 && isxdigit(c)) {
val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
cp++;
continue;
}
break;
}
if (*cp == '.') {
/*
* 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 + 4)
return ((in_addr_t)-1);
*pp++ = val, cp++;
goto again;
}
/*
* Check for trailing characters.
*/
if (*cp && !isspace(*cp))
return ((in_addr_t)-1);
*pp++ = val;
/*
* Concoct the address according to
* the number of parts specified.
*/
n = pp - parts;
switch (n) {
case 1: /* a -- 32 bits */
val = parts[0];
break;
case 2: /* a.b -- 8.24 bits */
val = (parts[0] << 24) | (parts[1] & 0xffffff);
break;
case 3: /* a.b.c -- 8.8.16 bits */
val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
(parts[2] & 0xffff);
break;
case 4: /* a.b.c.d -- 8.8.8.8 bits */
val = (parts[0] << 24) | ((parts[1] & 0xff) << 16) |
((parts[2] & 0xff) << 8) | (parts[3] & 0xff);
break;
default:
return ((in_addr_t)-1);
}
val = htonl(val);
return (val);
}
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