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/*
* dmucs_resolve.cc: Helperfunction to reslove host names
*
* Copyright (C) 2006 Patrik Olesen
*
* 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; either version 2 of the License, or (at your
* option) any later version.
*
* 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
*/
#include "config.h"
#include <string>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <netdb.h>
#include <pthread.h>
#ifndef HAVE_GETHOSTBYADDR_R
#ifdef HAVE_GETHOSTBYADDR
static pthread_mutex_t gethost_mutex;
static int gethost_mutex_inited = 0;
#endif /* HAVE_GETHOSTBYADDR */
#endif /* !HAVE_GETHOSTBYADDR_R */
const std::string &
getHostName(std::string &resolvedName, const struct in_addr &ipAddr)
{
int myerrno;
int res8 = 0;
struct hostent he, *res = 0;
char buffer[128];
#if HAVE_GETHOSTBYADDR_R
#if HAVE_GETHOSTBYADDR_R_7_ARGS
res = gethostbyaddr_r((char *)&(ipAddr.s_addr), sizeof(ipAddr.s_addr),
AF_INET, &he, buffer, 128, &myerrno);
#elif HAVE_GETHOSTBYADDR_R_8_ARGS
res8 = gethostbyaddr_r((char *)&(ipAddr.s_addr), sizeof(ipAddr.s_addr),
AF_INET, &he, buffer, 128, &res, &myerrno);
#else
#error HELP -- do not know how to compile gethostbyaddr_r
#endif /* HAVE_GETHOSTBYADDR_R_X_ARGS */
#elif HAVE_GETHOSTBYADDR
/* Buffer used to make it thread safe */
if (gethost_mutex_inited == 0) {
pthread_mutex_init(&gethost_mutex,0);
gethost_mutex_inited = 1;
}
pthread_mutex_lock(&gethost_mutex);
res = gethostbyaddr((char *)&(ipAddr.s_addr), sizeof(ipAddr.s_addr),
AF_INET);
if (res != NULL) {
strncpy(buffer, res->h_name, sizeof(buffer));
buffer[sizeof(buffer) - 1] = '\0';
he.h_name = buffer;
}
pthread_mutex_unlock(&gethost_mutex);
#else
#error HELP -- do not know how to compile gethostbyaddr
#endif
resolvedName = (res == NULL || res8 != 0) ?
inet_ntoa(ipAddr) : he.h_name;
return resolvedName;
}
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