get_hostname.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
* All rights reserved.
* 
* ---------------------------------------------------------------------------
* For a license to use or redistribute the OpenPBS software under conditions
* other than those described below, or to purchase support for this software,
* please contact Veridian Systems, PBS Products Department ("Licensor") at:
* 
*    www.OpenPBS.org  [phone]                  [e-mail]
*                        877 902-4PBS (US toll-free)
* ---------------------------------------------------------------------------
* 
* This license covers use of the OpenPBS v2.3 software (the "Software") at
* your site or location, and, for certain users, redistribution of the
* Software to other sites and locations.  Use and redistribution of
* OpenPBS v2.3 in source and binary forms, with or without modification,
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* After December 31, 2001, only conditions 3-6 must be met:
* 
* 1. Commercial and/or non-commercial use of the Software is permitted
*    provided a current software registration is on file at www.OpenPBS.org.
*    If use of this software contributes to a publication, product, or
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*    software incorporating the Software.  Further, there can be no
*    expectation of revenue generated as a consequence of redistributing
*    the Software.
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* 3. Any Redistribution of source code must retain the above copyright notice
*    and the acknowledgment contained in paragraph 6, this list of conditions
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*/

#include <pbs_config.h>   /* the master config generated by configure */

#include <sys/types.h>
#include <netinet/in.h>
#include "portability.h"
#include <netdb.h>
#include <string.h>

static char ident[] = "@(#) $RCSfile: get_hostname.c,v $ $Revision: 2.1.10.4 $";

/*
 * get_fullhostname - get the fully qualified name of a host
 *
 * Returns: 0 - if success
 *		host name in character buffer pointed to by namebuf	
 *	   -1 - if error
 */

int get_fullhostname(shortname, namebuf, bufsize)
	char *shortname;
	char *namebuf;
	int   bufsize;
{
	char	       *pbkslh = 0;
	char           *pcolon = 0;
	struct hostent *phe;
	struct in_addr  ina;

	if (pcolon = strchr(shortname, (int)':')) {
		*pcolon = '\0';
		if (*(pcolon-1) == '\\')
			*(pbkslh = pcolon-1) = '\0';
	}
	phe = gethostbyname(shortname);
	if (pcolon) {
		*pcolon = ':';	/* replace the colon */
		if (pbkslh)
			*pbkslh = '\\';
	}
	if (phe == (struct hostent *)0)
		return (-1);

	(void)memcpy((char *)&ina, *phe->h_addr_list, phe->h_length);
	if ((phe = gethostbyaddr((char *)&ina, phe->h_length, phe->h_addrtype))
									   == 0)
		return (-1);

	if ((size_t)bufsize < strlen(phe->h_name))
		return (-1);
	(void)strncpy(namebuf, phe->h_name, bufsize);
	*(namebuf + bufsize) = '\0';	/* insure null terminated */
	return (0);
}