/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   SMB client generic functions
   Copyright (C) Andrew Tridgell 1994-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program 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 General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#define NO_SYSLOG

#include "includes.h"


extern int DEBUGLEVEL;
static void cli_process_oplock(struct cli_state *cli);

/*
 * Change the port number used to call on 
 */
int cli_set_port(struct cli_state *cli, int port)
{
	if (port > 0)
	  cli->port = port;

	return cli->port;
}

/****************************************************************************
recv an smb
****************************************************************************/
BOOL cli_receive_smb(struct cli_state *cli)
{
	BOOL ret;
 again:
	ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
	
	if (ret) {
		/* it might be an oplock break request */
		if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
		    CVAL(cli->inbuf,smb_com) == SMBlockingX &&
		    SVAL(cli->inbuf,smb_vwv6) == 0 &&
		    SVAL(cli->inbuf,smb_vwv7) == 0) {
			if (cli->use_oplocks) cli_process_oplock(cli);
			/* try to prevent loops */
			CVAL(cli->inbuf,smb_com) = 0xFF;
			goto again;
		}
	}

	return ret;
}

/****************************************************************************
  send an smb to a fd and re-establish if necessary
****************************************************************************/
BOOL cli_send_smb(struct cli_state *cli)
{
	size_t len;
	size_t nwritten=0;
	ssize_t ret;
	BOOL reestablished=False;

	len = smb_len(cli->outbuf) + 4;

	while (nwritten < len) {
		ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
		if (ret <= 0 && errno == EPIPE && !reestablished) {
			if (cli_reestablish_connection(cli)) {
				reestablished = True;
				nwritten=0;
				continue;
			}
		}
		if (ret <= 0) {
			DEBUG(0,("Error writing %d bytes to client. %d\n",
				 (int)len,(int)ret));
			return False;
		}
		nwritten += ret;
	}
	
	return True;
}

/****************************************************************************
setup basics in a outgoing packet
****************************************************************************/
void cli_setup_packet(struct cli_state *cli)
{
        cli->rap_error = 0;
        cli->nt_error = 0;
	SSVAL(cli->outbuf,smb_pid,cli->pid);
	SSVAL(cli->outbuf,smb_uid,cli->vuid);
	SSVAL(cli->outbuf,smb_mid,cli->mid);
	if (cli->protocol > PROTOCOL_CORE) {
		SCVAL(cli->outbuf,smb_flg,0x8);
		SSVAL(cli->outbuf,smb_flg2,0x1);
	}
}



/****************************************************************************
process an oplock break request from the server
****************************************************************************/
static void cli_process_oplock(struct cli_state *cli)
{
	char *oldbuf = cli->outbuf;
	pstring buf;
	int fnum;

	fnum = SVAL(cli->inbuf,smb_vwv2);

	/* damn, we really need to keep a record of open files so we
	   can detect a oplock break and a close crossing on the
	   wire. for now this swallows the errors */
	if (fnum == 0) return;

	cli->outbuf = buf;

        memset(buf,'\0',smb_size);
        set_message(buf,8,0,True);

        CVAL(buf,smb_com) = SMBlockingX;
	SSVAL(buf,smb_tid, cli->cnum);
        cli_setup_packet(cli);
	SSVAL(buf,smb_vwv0,0xFF);
	SSVAL(buf,smb_vwv1,0);
	SSVAL(buf,smb_vwv2,fnum);
	SSVAL(buf,smb_vwv3,2); /* oplock break ack */
	SIVAL(buf,smb_vwv4,0); /* timoeut */
	SSVAL(buf,smb_vwv6,0); /* unlockcount */
	SSVAL(buf,smb_vwv7,0); /* lockcount */

        cli_send_smb(cli);	

	cli->outbuf = oldbuf;
}


/****************************************************************************
initialise a client structure
****************************************************************************/
struct cli_state *cli_initialise(struct cli_state *cli)
{
	if (!cli) {
		cli = (struct cli_state *)malloc(sizeof(*cli));
		if (!cli)
			return NULL;
		ZERO_STRUCTP(cli);
	}

	if (cli->initialised) {
		cli_shutdown(cli);
	}

	ZERO_STRUCTP(cli);

	cli->port = 0;
	cli->fd = -1;
	cli->cnum = -1;
	cli->pid = (uint16)sys_getpid();
	cli->mid = 1;
	cli->vuid = UID_FIELD_INVALID;
	cli->protocol = PROTOCOL_NT1;
	cli->timeout = 20000; /* Timeout is in milliseconds. */
	cli->bufsize = CLI_BUFFER_SIZE+4;
	cli->max_xmit = cli->bufsize;
	cli->outbuf = (char *)malloc(cli->bufsize);
	cli->inbuf = (char *)malloc(cli->bufsize);
	if (!cli->outbuf || !cli->inbuf)
	{
		return False;
	}

	memset(cli->outbuf, '\0', cli->bufsize);
	memset(cli->inbuf, '\0', cli->bufsize);

	cli->initialised = 1;

	return cli;
}

/****************************************************************************
shutdown a client structure
****************************************************************************/
void cli_shutdown(struct cli_state *cli)
{
	if (cli->outbuf)
	{
		free(cli->outbuf);
	}
	if (cli->inbuf)
	{
		free(cli->inbuf);
	}
#ifdef WITH_SSL
    if (cli->fd != -1)
      sslutil_disconnect(cli->fd);
#endif /* WITH_SSL */
	if (cli->fd != -1) 
      close(cli->fd);
	memset(cli, 0, sizeof(*cli));
}


/****************************************************************************
set socket options on a open connection
****************************************************************************/
void cli_sockopt(struct cli_state *cli, char *options)
{
	set_socket_options(cli->fd, options);
}

/****************************************************************************
set the PID to use for smb messages. Return the old pid.
****************************************************************************/
uint16 cli_setpid(struct cli_state *cli, uint16 pid)
{
	uint16 ret = cli->pid;
	cli->pid = pid;
	return ret;
}