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/** BEGIN COPYRIGHT BLOCK
* This Program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this Program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA.
*
* In addition, as a special exception, Red Hat, Inc. gives You the additional
* right to link the code of this Program with code not covered under the GNU
* General Public License ("Non-GPL Code") and to distribute linked combinations
* including the two, subject to the limitations in this paragraph. Non-GPL Code
* permitted under this exception must only link to the code of this Program
* through those well defined interfaces identified in the file named EXCEPTION
* found in the source code files (the "Approved Interfaces"). The files of
* Non-GPL Code may instantiate templates or use macros or inline functions from
* the Approved Interfaces without causing the resulting work to be covered by
* the GNU General Public License. Only Red Hat, Inc. may make changes or
* additions to the list of Approved Interfaces. You must obey the GNU General
* Public License in all respects for all of the Program code and other code used
* in conjunction with the Program except the Non-GPL Code covered by this
* exception. If you modify this file, you may extend this exception to your
* version of the file, but you are not obligated to do so. If you do not wish to
* provide this exception without modification, you must delete this exception
* statement from your version and license this file solely under the GPL without
* exception.
*
*
* Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
* Copyright (C) 2005 Red Hat, Inc.
* All rights reserved.
* END COPYRIGHT BLOCK **/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
/*
* dns.c: DNS resolution routines
*
* Rob McCool
*/
#define DNS_GUESSING
#include "netsite.h"
#ifdef XP_UNIX
#include "systems.h"
#else /* XP_WIN32 */
#include "base/systems.h"
#endif /* XP_WIN32 */
/* Under NT, these are taken care of by net.h including winsock.h */
#ifdef XP_UNIX
#include <arpa/inet.h> /* inet_ntoa */
#include <netdb.h> /* struct hostent */
#ifdef NEED_GHN_PROTO
extern "C" int gethostname (char *name, size_t namelen);
#endif
#endif
#include <stdio.h>
#include <nspr.h>
/* ---------------------------- dns_find_fqdn ----------------------------- */
/* defined in dnsdmain.c */
extern "C" NSAPI_PUBLIC char *dns_guess_domain(char * hname);
char *net_find_fqdn(PRHostEnt *p)
{
int x;
if((!p->h_name) || (!p->h_aliases))
return NULL;
if(!strchr(p->h_name, '.')) {
for(x = 0; p->h_aliases[x]; ++x) {
if((strchr(p->h_aliases[x], '.')) &&
(!strncmp(p->h_aliases[x], p->h_name, strlen(p->h_name))))
{
return STRDUP(p->h_aliases[x]);
}
}
#ifdef DNS_GUESSING
return dns_guess_domain(p->h_name);
#else
return NULL;
#endif /* DNS_GUESSING */
}
else
return STRDUP(p->h_name);
}
/* ----------------------------- dns_ip2host ------------------------------ */
char *dns_ip2host(char *ip, int verify)
{
/* struct in_addr iaddr; */
PRNetAddr iaddr;
char *hn;
static unsigned long laddr = 0;
static char myhostname[256];
PRHostEnt hent;
char buf[PR_NETDB_BUF_SIZE];
PRStatus err;
err = PR_InitializeNetAddr(PR_IpAddrNull, 0, &iaddr);
/* richm: ipv6 cleanup - use inet_aton or other more appropriate function
instead of inet_addr */
if((iaddr.inet.ip = inet_addr(ip)) == (in_addr_t)-1)
goto bong;
/*
* See if it happens to be the localhost IP address, and try
* the local host name if so.
*/
if (laddr == 0) {
laddr = inet_addr("127.0.0.1");
myhostname[0] = 0;
PR_GetSystemInfo(PR_SI_HOSTNAME, myhostname, sizeof(myhostname));
}
/* Have to match the localhost IP address and have a hostname */
if ((iaddr.inet.ip == laddr) && (myhostname[0] != 0)) {
/*
* Now try for a fully-qualified domain name, starting with
* the local hostname.
*/
err = PR_GetHostByName(myhostname,
buf,
PR_NETDB_BUF_SIZE,
&hent);
/* Don't verify if we get a fully-qualified name this way */
verify = 0;
}
else {
err = PR_GetHostByAddr(&iaddr,
buf,
PR_NETDB_BUF_SIZE,
&hent);
}
if ((err == PR_FAILURE) || !(hn = net_find_fqdn(&hent))) goto bong;
if(verify) {
char **haddr = 0;
err = PR_GetHostByName(hn,
buf,
PR_NETDB_BUF_SIZE,
&hent);
if(err == PR_SUCCESS) {
for(haddr = hent.h_addr_list; *haddr; haddr++) {
if(((struct in_addr *)(*haddr))->s_addr == iaddr.inet.ip)
break;
}
}
if((err == PR_FAILURE) || (!(*haddr)))
goto bong;
}
return hn;
bong:
return NULL;
}
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