/*
 * Copyright (C) 1994-2021 Altair Engineering, Inc.
 * For more information, contact Altair at www.altair.com.
 *
 * This file is part of both the OpenPBS software ("OpenPBS")
 * and the PBS Professional ("PBS Pro") software.
 *
 * Open Source License Information:
 *
 * OpenPBS 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.
 *
 * OpenPBS 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:
 *
 * PBS Pro is commercially licensed software that shares a common core with
 * the OpenPBS software.  For a copy of the commercial license terms and
 * conditions, go to: (http://www.pbspro.com/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 OpenPBS 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™",
 * "OpenPBS®", "PBS Professional®", and "PBS Pro™" and Altair's logos is
 * subject to Altair's trademark licensing policies.
 */

/**
 * @file	int_submit.c
 */
#include <pbs_config.h> /* the master config generated by configure */

#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdint.h>

#include "portability.h"
#include "libpbs.h"
#include "dis.h"
#include "tpp.h"
#include "net_connect.h"

/**
 * @brief - Start a standard inter-server message.
 *
 * @param[in] stream  - The TPP stream on which to send message
 * @param[in] command - The message type (cmd) to encode
 *
 * @return error code
 * @retval  DIS_SUCCESS - Success
 * @retval !DIS_SUCCESS - Failure
 */
int
is_compose(int stream, int command)
{
	int ret;

	if (stream < 0)
		return DIS_EOF;
	DIS_tpp_funcs();

	ret = diswsi(stream, IS_PROTOCOL);
	if (ret != DIS_SUCCESS)
		goto done;
	ret = diswsi(stream, IS_PROTOCOL_VER);
	if (ret != DIS_SUCCESS)
		goto done;
	ret = diswsi(stream, command);
	if (ret != DIS_SUCCESS)
		goto done;

	return DIS_SUCCESS;

done:
	return ret;
}

/**
 * @brief - Get a unique id each time this function is called
 *
 * @par NOTE:
 *	This id is used as a message id in every command sent out from
 * 	this daemon. This is done to match replies to asynchronous
 * 	command sends to the replies that we receive later
 *
 * @param[out] id - The return msgid created
 *
 * @return error code
 * @retval  DIS_SUCCESS  - Success
 * @retval  DIS_NOMALLOC - Failure
 */
int
get_msgid(char **id)
{
	char msgid[MAXNAMLEN];

	static time_t last_time = -1;
	static int counter = 0;
	time_t now = time(NULL);

	if (now != last_time) {
		counter = 0;
		last_time = now;
	} else {
		counter++;
	}
#ifdef WIN32
	sprintf(msgid, "%ld:%d", now, counter);
#else
	sprintf(msgid, "%ju:%d", (uintmax_t) now, counter);
#endif
	if ((*id = strdup(msgid)) == NULL)
		return DIS_NOMALLOC;

	return DIS_SUCCESS;
}

/**
 * @brief - Compose a command to be sent over TPP stream
 *
 * @par Functionality:
 *	calls im_compose to create the message header, get_msgid to
 * 	add a msg id to the header (unless one is passed)
 *
 * @param[in] stream - Tpp stream to write to
 * @param[in] command - The command to encode
 * @param[in,out] ret_msgid - The msgid, if passed to this function, is
 *                            the msgid to be used for this message.
 *                            If msgid is not passed, then create a unique
 *                            msgid and set for the message, also return it
 *                            back to caller.
 *
 * @return error code
 * @retval  DIS_SUCCESS - Success
 * @retval !DIS_SUCCESS - Failure
 */
int
is_compose_cmd(int stream, int command, char **ret_msgid)
{
	int ret;
	char *temp_id = NULL;

	if ((ret = is_compose(stream, command)) != DIS_SUCCESS)
		return ret;

	/* Create a temp msg id, when there is no buffer passed */
	if (ret_msgid == NULL)
		ret = get_msgid(&temp_id);
	else if (*ret_msgid == NULL || *ret_msgid[0] == '\0') /* buffer passed but NULL or empty id provided */
		if ((ret = get_msgid(ret_msgid)) != 0)
			return ret;

	if ((ret = diswst(stream, ret_msgid ? *ret_msgid : temp_id)) != DIS_SUCCESS)
		return ret;

	free(temp_id);

	return DIS_SUCCESS;
}

/**
 * @brief
 *	-PBS_commit.c This function does the Commit sub-function of
 *	the Queue Job request.
 *
 * @param[in] c - socket fd
 * @param[in] jobid - job identifier
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 * @param[in] extend - extend field, comma separated key value pair
 *
 * @return      int
 * @retval      0               success
 * @retval      !0(pbs_errno)   failure
 *
 */
int
PBSD_commit(int c, char *jobid, int prot, char **msgid, char *extend)
{
	struct batch_reply *reply;
	int rc;

	if (prot == PROT_TCP) {
		DIS_tcp_funcs();
	} else {
		if ((rc = is_compose_cmd(c, IS_CMD, msgid)) != DIS_SUCCESS)
			return rc;
	}

	if ((rc = encode_DIS_ReqHdr(c, PBS_BATCH_Commit, pbs_current_user)) ||
	    (rc = encode_DIS_JobId(c, jobid)) ||
	    (rc = encode_DIS_ReqExtend(c, extend))) {
		if (prot == PROT_TCP) {
			if (set_conn_errtxt(c, dis_emsg[rc]) != 0) {
				return (pbs_errno = PBSE_SYSTEM);
			}
		}
		return (pbs_errno = PBSE_PROTOCOL);
	}

	if (prot == PROT_TPP) {
		pbs_errno = PBSE_NONE;
		if (dis_flush(c))
			pbs_errno = PBSE_PROTOCOL;
		return pbs_errno;
	}

	if (dis_flush(c)) {
		return (pbs_errno = PBSE_PROTOCOL);
	}

	reply = PBSD_rdrpy(c);

	PBSD_FreeReply(reply);

	return get_conn_errno(c);
}

/**
 * @brief
 *	-PBS_scbuf.c Send a chunk of a of the job script to the server.
 *	Called by pbs_submit.  The buffer length could be
 *	zero; the server should handle that case...
 *
 * @param[in] c - connection handle
 * @param[in] reqtype - request type
 * @param[in] seq - file chunk sequence number
 * @param[in] buf - file chunk
 * @param[in] len - length of chunk
 * @param[in] jobid - ob id (for types 1 and 2 only)
 * @param[in] which - standard file type (enum)
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 *
 * @return      int
 * @retval      0               success
 * @retval      !0(pbs_errno)   failure
 *
 */
static int
PBSD_scbuf(int c, int reqtype, int seq, char *buf, int len, char *jobid, enum job_file which, int prot, char **msgid)
{
	struct batch_reply *reply;
	int rc;

	if (prot == PROT_TCP) {
		DIS_tcp_funcs();
	} else {
		if ((rc = is_compose_cmd(c, IS_CMD, msgid)) != DIS_SUCCESS)
			return rc;
	}

	if (jobid == NULL)
		jobid = ""; /* use null string for null pointer */

	if ((rc = encode_DIS_ReqHdr(c, reqtype, pbs_current_user)) ||
	    (rc = encode_DIS_JobFile(c, seq, buf, len, jobid, which)) ||
	    (rc = encode_DIS_ReqExtend(c, NULL))) {
		if (prot == PROT_TCP) {
			if (set_conn_errtxt(c, dis_emsg[rc]) != 0) {
				return (pbs_errno = PBSE_SYSTEM);
			}
		}
		return (pbs_errno = PBSE_PROTOCOL);
	}

	if (prot == PROT_TPP) {
		pbs_errno = PBSE_NONE;
		if (dis_flush(c))
			pbs_errno = PBSE_PROTOCOL;
		return pbs_errno;
	}

	if (dis_flush(c)) {
		return (pbs_errno = PBSE_PROTOCOL);
	}

	/* read reply */

	reply = PBSD_rdrpy(c);

	PBSD_FreeReply(reply);

	return get_conn_errno(c);
}

/**
 * @brief
 *	-The Job File function used to move files related to
 *	a job between servers.
 *	-- the function PBS_scbuf is called repeatedly to
 *	transfer chunks of the script to the server.
 *
 * @param[in] c - connection handle
 * @param[in] script_file - job file
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 *
 * @return	int
 * @retval	0	success
 * @retval	-1	failure
 *
 */

int
PBSD_jscript(int c, const char *script_file, int prot, char **msgid)
{
	int i;
	int fd;
	int cc;
	char s_buf[SCRIPT_CHUNK_Z];
	int rc = 0;

	if ((fd = open(script_file, O_RDONLY, 0)) < 0) {
		return (-1);
	}
	i = 0;
	cc = read(fd, s_buf, SCRIPT_CHUNK_Z);
	while ((cc > 0) &&
	       ((rc = PBSD_scbuf(c, PBS_BATCH_jobscript, i, s_buf, cc, NULL, JScript, prot, msgid)) == 0)) {
		i++;
		cc = read(fd, s_buf, SCRIPT_CHUNK_Z);
	}

	close(fd);
	if (cc < 0) /* read failed */
		return (-1);

	if (prot == PROT_TPP)
		return (rc);

	return get_conn_errno(c);
}

/**
 * @brief
 *	job file function for moving file between server/mom
 *
 * @param[in] c - connection handle
 * @param[in] script_file - job file
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 *
 * @return      int
 * @retval      0       success
 * @retval      -1      failure
 *
 */
int
PBSD_jscript_direct(int c, char *script, int prot, char **msgid)
{
	int rc;
	int tosend;
	int i = 0;
	char *p = script;
	int len;

	if (script == NULL) {
		pbs_errno = PBSE_INTERNAL;
		return -1;
	}

	len = strlen(script);
	do {
		tosend = (len > SCRIPT_CHUNK_Z) ? SCRIPT_CHUNK_Z : len;
		rc = PBSD_scbuf(c, PBS_BATCH_jobscript, i, p, tosend, NULL, JScript, prot, msgid);
		i++;
		p += tosend;
		len -= tosend;
	} while ((rc == 0) && (len > 0));

	if (prot == PROT_TPP)
		return (rc);

	return get_conn_errno(c);
}

/**
 * @brief
 *	-PBS_jobfile.c
 *	The Job File function used to move files related to
 *	a job between servers.
 *	-- the function PBS_scbuf is called repeatedly to
 *	transfer chunks of the script to the server.
 *
 * @param[in] c - connection handle
 * @param[in] reqtype - request type
 * @param[in] path - file path
 * @param[in] jobid - job id
 * @param[in] which - standard file type (enum)
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 *
 * @return      int
 * @retval      0       success
 * @retval      -1      failure
 *
 */
int
PBSD_jobfile(int c, int req_type, char *path, char *jobid, enum job_file which, int prot, char **msgid)
{
	int i;
	int cc;
	int fd;
	char s_buf[SCRIPT_CHUNK_Z];
	int rc = 0;

	if ((fd = open(path, O_RDONLY, 0)) < 0) {
		return (-1);
	}
	i = 0;
	cc = read(fd, s_buf, SCRIPT_CHUNK_Z);
	while ((cc > 0) &&
	       ((rc = PBSD_scbuf(c, req_type, i, s_buf, cc, jobid, which, prot, msgid)) == 0)) {
		i++;
		cc = read(fd, s_buf, SCRIPT_CHUNK_Z);
	}

	close(fd);
	if (cc < 0) /* read failed */
		return (-1);

	if (prot == PROT_TPP)
		return rc;

	return get_conn_errno(c);
}

/**
 * @brief
 *	-PBS_queuejob.c
 *	This function sends the first part of the Queue Job request
 *
 * @param[in] c - socket descriptor
 * @param[in] jobid - job identifier
 * @param[in] destin - destination name
 * @param[in] attrib - pointer to attribute list
 * @param[in] extend - extention string for req encode
 * @param[in] prot - PROT_TCP or PROT_TPP
 * @param[in] msgid - message id
 * @param[out] commit_done - 1 if job committed, 0 if not yet committed
 *
 * @return      int
 * @retval      0               Success
 * @retval      pbs_error(!0)   error
 */
char *
PBSD_queuejob(int c, char *jobid, const char *destin, struct attropl *attrib, const char *extend, int prot, char **msgid, int *commit_done)
{
	struct batch_reply *reply;
	char *return_jobid = NULL;
	int rc;

	if (commit_done)
		*commit_done = 0;

	if (prot == PROT_TCP) {
		DIS_tcp_funcs();
	} else {
		if ((rc = is_compose_cmd(c, IS_CMD, msgid)) != DIS_SUCCESS) {
			pbs_errno = PBSE_PROTOCOL;
			return return_jobid;
		}
	}

	/* first, set up the body of the Queue Job request */

	if ((rc = encode_DIS_ReqHdr(c, PBS_BATCH_QueueJob, pbs_current_user)) ||
	    (rc = encode_DIS_QueueJob(c, jobid, destin, attrib)) ||
	    (rc = encode_DIS_ReqExtend(c, extend))) {
		if (prot == PROT_TCP) {
			if (set_conn_errtxt(c, dis_emsg[rc]) != 0) {
				pbs_errno = PBSE_SYSTEM;
				return NULL;
			}
			pbs_errno = PBSE_PROTOCOL;
		}
		return return_jobid;
	}

	if (prot == PROT_TPP) {
		pbs_errno = PBSE_NONE;
		if (dis_flush(c))
			pbs_errno = PBSE_PROTOCOL;

		return (""); /* return something NON-NULL for tpp */
	}

	if (dis_flush(c)) {
		pbs_errno = PBSE_PROTOCOL;
		return return_jobid;
	}

	/* read reply from stream into presentation element */

	reply = PBSD_rdrpy(c);
	if (reply == NULL) {
		pbs_errno = PBSE_PROTOCOL;
	} else if (reply->brp_choice &&
		   reply->brp_choice != BATCH_REPLY_CHOICE_Text &&
		   reply->brp_choice != BATCH_REPLY_CHOICE_Queue &&
		   reply->brp_choice != BATCH_REPLY_CHOICE_Commit) {
		pbs_errno = PBSE_PROTOCOL;
	} else if (get_conn_errno(c) == 0) {
		return_jobid = strdup(reply->brp_un.brp_jid);
		if (return_jobid == NULL) {
			pbs_errno = PBSE_SYSTEM;
		}
		if (commit_done && (reply->brp_choice == BATCH_REPLY_CHOICE_Commit))
			*commit_done = 1;
	}

	PBSD_FreeReply(reply);
	return return_jobid;
}