/*
 * Copyright (C) 1994-2018 Altair Engineering, Inc.
 * For more information, contact Altair at www.altair.com.
 *
 * This file is part of the PBS Professional ("PBS Pro") software.
 *
 * Open Source License Information:
 *
 * PBS Pro is free software. You can redistribute it and/or modify it under the
 * terms of the GNU Affero General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * PBS Pro 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Commercial License Information:
 *
 * For a copy of the commercial license terms and conditions,
 * go to: (http://www.pbspro.com/UserArea/agreement.html)
 * or contact the Altair Legal Department.
 *
 * Altair’s dual-license business model allows companies, individuals, and
 * organizations to create proprietary derivative works of PBS Pro and
 * distribute them - whether embedded or bundled with other software -
 * under a commercial license agreement.
 *
 * Use of Altair’s trademarks, including but not limited to "PBS™",
 * "PBS Professional®", and "PBS Pro™" and Altair’s logos is subject to Altair's
 * trademark licensing policies.
 *
 */


/**
 * @file	dec_ReqHdr.c
 * @brief
 * decode_DIS_ReqHdr() - Decode the Request Header Fields
 *	common to all requests
 *
 * @par	Fields are:
 * 			Protocol ID (unsigned integer)
 *			Protocol Version (unsigned integer)
 *			Request Type (unsignded integer)
 *			User Name (string)
 *
 * @par Returns:
 *		  -1	on EOF (end of file on first read only)
 *		   0	on success
 *		  >0	a DIS error return, see dis.h
 */

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

#include <sys/types.h>
#include "libpbs.h"
#include "list_link.h"
#include "server_limits.h"
#include "attribute.h"
#include "credential.h"
#include "batch_request.h"
#include "dis.h"

/**
 * @brief-
 *	Decode the Request Header Fields
 *      common to all requests
 *
 * @param[in] sock - socket descriptor
 * @param[out] preq - pointer to batch_request structure
 *
 * @return	int
 * @retval	-1    on EOF (end of file on first read only)
 * @retval	0    on success
 * @retval	>0    a DIS error return, see dis.h
 *
 */

int
decode_DIS_ReqHdr(int sock, struct batch_request *preq, int *proto_type, int *proto_ver)
{
	int rc;

	*proto_type = disrui(sock, &rc);
	if (rc) {
		return rc;
	}
	if (*proto_type != PBS_BATCH_PROT_TYPE)
		return  DIS_PROTO;
	*proto_ver = disrui(sock, &rc);
	if (rc) {
		return rc;
	}

	preq->rq_type = disrui(sock, &rc);
	if (rc) {
		return rc;
	}

	return (disrfst(sock, PBS_MAXUSER+1, preq->rq_user));
}
