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/*
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* Copyright (C) 2005 Nigel Horne <njh@bandsman.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#if HAVE_CONFIG_H
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#include "clamav-config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netdb.h>
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#ifdef CL_THREAD_SAFE
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#include <pthread.h>
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#endif
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/*
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* TODO: gethostbyname_r is non-standard so different operating
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* systems do it in different ways. Need more examples
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* Perhaps we could use res_search()?
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*
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* Returns 0 for success
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*/
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int r_gethostbyname(const char *hostname, struct hostent *hp, char *buf, size_t len)
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{
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#if defined(HAVE_GETHOSTBYNAME_R_6)
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/* e.g. Linux */
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struct hostent *hp2;
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int ret = -1;
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if((hostname == NULL) || (hp == NULL))
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return -1;
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if(gethostbyname_r(hostname, hp, buf, len, &hp2, &ret) < 0)
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return ret;
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#elif defined(HAVE_GETHOSTBYNAME_R_5)
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/* e.g. BSD, Solaris, Cygwin */
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int ret = -1;
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if((hostname == NULL) || (hp == NULL))
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return -1;
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if(gethostbyname_r(hostname, hp, buf, len, &ret) == NULL)
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return ret;
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#elif defined(HAVE_GETHOSTBYNAME_R_3)
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/* e.g. HP/UX, AIX */
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if((hostname == NULL) || (hp == NULL))
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return -1;
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if(gethostbyname_r(hostname, &hp, (struct hostent_data *)buf) < 0)
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return h_errno;
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#else
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/* Single thread the code */
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struct hostent *hp2;
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#ifdef CL_THREAD_SAFE
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static pthread_mutex_t hostent_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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if((hostname == NULL) || (hp == NULL))
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return -1;
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#ifdef CL_THREAD_SAFE
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pthread_mutex_lock(&hostent_mutex);
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#endif
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if((hp2 = gethostbyname(hostname)) == NULL) {
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&hostent_mutex);
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#endif
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return h_errno;
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}
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memcpy(hp, hp2, sizeof(struct hostent));
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#ifdef CL_THREAD_SAFE
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pthread_mutex_unlock(&hostent_mutex);
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#endif
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#endif
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return 0;
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}
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