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/*
* Copyright (c) 1983 Regents of the University of California, (c) 1997 David Faure
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*
* (BSD License, from kdelibs/doc/common/bsd-license.html)
*
*/
#ifndef FORWMACH_H
#define FORWMACH_H
#include "../includ.h"
#include "../table.h"
#include "talkconn.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <signal.h>
// Strangely enough, SIGUSR1 doesn't get caught ... Why ??
#define SIGDELETE SIGUSR2
/* Forwarding machine scheme : (ANNOUNCE request only)
Caller (client) ForwMach--- Answerer (client)
\ | \
\ | \
Caller (daemon) ----ktalkd ------Answerer (daemon)
Caller always talks to us using ntalk (if otalk then kotalkd translates it)
But answerer might be using otalk. Let's check for it in processLookup.
*/
/** Implements the forwarding machine. */
class ForwMachine
{
public:
/** Constructor.
* @param mp Request received
* @param forward User@host to forward the talk
* @param _forwardMethod 3 letters to choose the method (see .talkdrc)
* @param c_id_num announce id_num, got from caller
* @param o_id_num our id_num in our table
* */
ForwMachine(const NEW_CTL_MSG * mp,
char * forward,
char * _forwardMethod,
int c_id_num);
/** Destructor. */
virtual ~ForwMachine();
// Child methods
/** Process the incoming ANNOUNCE request. */
void processAnnounce();
/** Processes the LOOK_UP request from answerer. */
void processLookup(const NEW_CTL_MSG * mp);
/** Processes the DELETE request from caller. Called by sig_handler. */
void processDelete();
// Parent methods
/** Send a DELETE signal to the child */
void sendDelete() { kill(pid, SIGDELETE); pid = 0; }
/** Checks if a LOOK_UP concerns this Forwarding Machine */
int isLookupForMe(const NEW_CTL_MSG * mp);
/** Used by forwMachFindMatch for NEUuser or local forward */
char * findMatch(NEW_CTL_MSG * mp);
/** Calls processLookup after finding the correct forwmachine instance in the table */
static int forwMachProcessLookup(TABLE_ENTRY * table, const NEW_CTL_MSG * mp);
/** Tries to find a match in the table for the given REQUEST structure.
* @see findMatch */
static char * forwMachFindMatch(TABLE_ENTRY * table, NEW_CTL_MSG * mp);
/** Get static ref to current ForwMachine. For sig_handler */
static ForwMachine * getForwMachine() { return pForwMachine; }
/** Start the ForwMachine process. Processes the announcement and waits for signals
* @param o_id_num Our id num in our table. */
void start(int o_id_num);
protected:
/** Static ref to current forwmachine. For sig_handler */
static ForwMachine * pForwMachine;
/** Pid of the child forwmachine */
int pid;
/** Fills privates fields from forward
* @param forward user@host to forward the talk */
int getNames(char * forward);
/** Respond to caller's daemon
* @param target the caller's machine address
* @param rp the response to send to it */
void sendResponse(const struct talk_addr target, NEW_CTL_RESPONSE * rp);
/** FWT Method : transmit characters from sockt1 to sockt2 */
int transmit_chars(int sockt1, int sockt2, unsigned char * buf);
/** FWT Method : we want to connect to both sides */
void connect_FWT(TalkConnection * tcCaller);
/** Method for the forwarding. */
enum {FWA, FWR, FWT} forwardMethod;
/** Answerer user name */
char answ_user[NEW_NAME_SIZE];
/** Answerer machine name */
char * answ_machine_name;
/** Answerer machine address */
struct in_addr answ_machine_addr;
/** Talk Connection to the answerer */
TalkConnection * tcAnsw;
/** id_num for the announce on answerer's machine. */
uint32_t answ_id_num;
/** Local user name, the original 'callee' */
char local_user[NEW_NAME_SIZE];
/** Our id_num (in our table) */
int our_id_num;
/** Caller's user name */
char caller_username[NEW_NAME_SIZE];
/** Caller's ctl_addr*/
struct talk_addr caller_ctl_addr;
/** Caller's machine address */
struct in_addr caller_machine_addr;
/** Caller's announce id_num */
int caller_id_num;
/** Caller's protocol */
ProtocolType callerProtocol;
};
#endif
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