/* BEGIN_ICS_COPYRIGHT5 ****************************************

Copyright (c) 2015-2020, Intel Corporation

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
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      may be used to endorse or promote products derived from this software
      without specific prior written permission.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ** END_ICS_COPYRIGHT5   ****************************************/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <signal.h>
#include <unistd.h>
#include "hsm_com_client_api.h"
#include "hsm_com_client_data.h"


int
unix_sck_send_msg(hsm_com_client_hdl_t *hdl, char *snd_buf, int snd_len, char *rcv_buf, int rcv_len, int timeout)
{
	int					nread = 0;
	int					n;
	fd_set				rset;
	struct timeval		tm;
	int					offset = 0;

	if (write(hdl->client_fd,snd_buf,snd_len)<0) {
		printf("return failed.\n");
		return 0;
	} 


	tm.tv_sec = timeout;
	tm.tv_usec = 0;

	FD_ZERO(&rset);


	FD_SET(hdl->client_fd,&rset);

	while(1)
	{

		if ( (n = select(hdl->client_fd + 1,&rset,NULL,NULL,&tm)) < 0){
			return 0;
		}

		if (FD_ISSET(hdl->client_fd, &rset)) 
		{
		
			if ( (nread = unix_sck_read_data(hdl->client_fd,
											 &hdl->scr,
											 hdl->recv_buf, 
											 hdl->buf_len,
											 &offset)) > 0)
			{
				if(nread <= rcv_len){
					memcpy(rcv_buf,hdl->recv_buf,nread);
					return nread;
				}
				// Response too big
				printf("response too big\n");
				return 0;
			}
			else if(nread < 0)
			{
				printf("Skipping since we need more data\n");
				continue;
			}
			else
			{
				// Error
				printf("Response is 0\n");
				return 0;
			}
		}
		
		
	}


	return nread;
}

hsm_com_errno_t
unix_sck_send_conn(hsm_com_client_hdl_t *hdl, int timeout)
{
	hsm_com_con_data_t	msg;

	memset(&msg,0,sizeof(msg));

	msg.header.cmd = HSM_COM_CMD_CONN;
	msg.header.ver = HSM_COM_VER;
	msg.header.trans_id = hdl->trans_id++;
	msg.header.payload_len = sizeof(msg.key);

	msg.key = HSM_COM_KEY;


	if(unix_sck_send_msg(hdl, (char*)&msg, sizeof(msg), (char*)&msg, 
						 sizeof(msg), timeout) != sizeof(msg))
	{
		// COM Error...
		// Close our connection
		close(hdl->client_fd);
		hdl->client_state = HSM_COM_C_STATE_IN;

		return HSM_COM_BAD;
	}

	if(msg.header.resp_code == HSM_COM_RESP_OK){
		return HSM_COM_OK;
	}

	return HSM_COM_BAD;
}


hsm_com_errno_t
unix_sck_send_disconnect(hsm_com_client_hdl_t *hdl, int timeout)
{
	hsm_com_discon_data_t	msg;

	memset(&msg,0,sizeof(msg));

	msg.header.cmd = HSM_COM_CMD_DISC;
	msg.header.ver = HSM_COM_VER;
	msg.header.trans_id = hdl->trans_id++;
	msg.header.payload_len = 0;

	if(unix_sck_send_msg(hdl, (char*)&msg, sizeof(msg), (char*)&msg, 
						 sizeof(msg), timeout) != sizeof(msg))
	{
		// COM Error...
		// Close our connection
		close(hdl->client_fd);
		hdl->client_state = HSM_COM_C_STATE_IN;

		return HSM_COM_BAD;
	}

	if(msg.header.resp_code == HSM_COM_RESP_OK){
		return HSM_COM_OK;
	}

	return HSM_COM_BAD;

}


hsm_com_errno_t
unix_sck_send_ping(hsm_com_client_hdl_t *hdl, int timeout)
{
	hsm_com_ping_data_t	msg;

	memset(&msg,0,sizeof(msg));

	msg.header.cmd = HSM_COM_CMD_PING;
	msg.header.ver = HSM_COM_VER;
	msg.header.trans_id = hdl->trans_id++;
	msg.header.payload_len = 0;

	if(unix_sck_send_msg(hdl, (char*)&msg, sizeof(msg), (char*)&msg, 
						 sizeof(msg), timeout) != sizeof(msg))
	{
		// COM Error...
		// Close our connection
		close(hdl->client_fd);
		hdl->client_state = HSM_COM_C_STATE_IN;

		return HSM_COM_BAD;
	}

	if(msg.header.resp_code == HSM_COM_RESP_OK){
		return HSM_COM_OK;
	}

	return HSM_COM_BAD;

}

hsm_com_errno_t
unix_sck_send_data(hsm_com_client_hdl_t *hdl, int timeout, 
				   hsm_com_datagram_t *send, hsm_com_datagram_t *recv)
{
	hsm_com_msg_t	*msg;
	int total_len;

	msg = (hsm_com_msg_t*)hdl->send_buf;

	msg->common.cmd = HSM_COM_CMD_DATA;
	msg->common.ver = HSM_COM_VER;
	msg->common.trans_id = hdl->trans_id++;
	msg->common.payload_len = send->data_len;

	total_len = sizeof(msg->common) + send->data_len;

	memcpy(&msg->data[0],send->buf,send->data_len);

	if(unix_sck_send_msg(hdl, hdl->send_buf, total_len, hdl->recv_buf, 
						 total_len, timeout) != total_len)
	{

		return HSM_COM_BAD;
	}

	msg = (hsm_com_msg_t*)hdl->recv_buf;
	if(msg->common.resp_code == HSM_COM_RESP_OK){
		unsigned long l = msg->common.payload_len;
		if (l <= recv->data_len){
			memcpy(recv->buf,&msg->data[0], l);
			recv->data_len = msg->common.payload_len;
			return HSM_COM_OK;
		}
	}

	return HSM_COM_BAD;

}


hsm_com_errno_t
unix_client_connect(hsm_com_client_hdl_t *hdl)
{
	int					fd, len;
	struct sockaddr_un	unix_addr;
	hsm_com_errno_t		res = HSM_COM_OK;

	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) 
	{
		return HSM_COM_ERROR;
	}

	memset(&unix_addr,0,sizeof(unix_addr));

	unix_addr.sun_family = AF_UNIX;
	
	if(strlen(hdl->c_path) >= sizeof(unix_addr.sun_path))
	{
		res = HSM_COM_PATH_ERR;
		goto cleanup;
	}

	snprintf(unix_addr.sun_path, sizeof(unix_addr.sun_path), "%s", hdl->c_path);

	len = SUN_LEN(&unix_addr);

	unlink(unix_addr.sun_path);

	if(bind(fd, (struct sockaddr *)&unix_addr, len) < 0)
	{
		res = HSM_COM_BIND_ERR;
		goto cleanup;
	}

	if(chmod(unix_addr.sun_path, S_IRWXU) < 0)
	{
		res = HSM_COM_CHMOD_ERR;
		goto cleanup;
	}

	memset(&unix_addr,0,sizeof(unix_addr));

	unix_addr.sun_family = AF_UNIX;
	snprintf(unix_addr.sun_path, sizeof(unix_addr.sun_path), "%s", hdl->s_path);

	len = SUN_LEN(&unix_addr);

	if (connect(fd, (struct sockaddr *) &unix_addr, len) < 0) 
	{
		res = HSM_COM_CONX_ERR;
		goto cleanup;
	}

	hdl->client_fd = fd;
	hdl->client_state = HSM_COM_C_STATE_CT;

	// Send connection data packet
	if(unix_sck_send_conn(hdl, 2) != HSM_COM_OK)
	{
		hdl->client_state = HSM_COM_C_STATE_IN;
		res = HSM_COM_SEND_ERR;
	}

	return res;

cleanup:
	close(fd);
	return res;

}


hsm_com_errno_t
unix_client_disconnect(hsm_com_client_hdl_t *hdl)
{
	// Send connection data packet
	if(unix_sck_send_disconnect(hdl, 2) != HSM_COM_OK)
	{
		return(-1);
	}

	close(hdl->client_fd);
	hdl->client_state = HSM_COM_C_STATE_IN;


	return HSM_COM_OK;

}