session.c 8.68 KB
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/*
 * session.c
 *
 * Session control and miscellaneous.
 */

#include <time.h>
#include <stdlib.h>
#include "lyskomd.h"
#include <kom-types.h>
#include <services.h>
#include "manipulate.h"
#include "cache.h"
#include "com.h"
#include "connections.h"
#include "send-async.h"
#include "smalloc.h"
#include "log.h"
#include <kom-errno.h>
#include "config.h"
#include "internal-connections.h"

/*
 * This function is called whenever a person leaves a conf,
 * i e when he pepsi():s or logout():s.
 */

extern void
leave_conf(void)
{
    Membership * mship;

    if (active_connection->cwc != 0 )
    {
	if ((mship = locate_membership( active_connection->cwc, ACT_P ))
	    != NULL )
	{
	    time(&mship->last_time_read);
	    mark_person_as_changed (active_connection->pers_no);
	}
	else
	{
	    log("ERROR: leave_conf(): Can't find membership of cwc.\n");
	}
	
	cached_unlock_conf( active_connection->cwc );
	active_connection->cwc = 0;
    }
}

/*
 * Log in as user pers_no. If ACTPERS is a supervisor of pers_no the login
 * will succeed regardless of the passwd. An logout() will automatically
 * be performed if ACTPERS is logged in.
 */
extern Success
login (Pers_no       pers_no,
       const String  passwd)
{
    Person *pers_p;

    GET_P_STAT(pers_p, pers_no, FAILURE);
    
#if 0
    if ( !logins_allowed  && !pers_p->privileges.wheel)
    {
	kom_errno = KOM_LOGIN_DISALLOWED;
	return FAILURE;
    }
#endif
    
    if ( !is_supervisor(pers_no, NULL)
	&& chk_passwd(pers_p->pwd, passwd) == FAILURE )
    {
	kom_errno = KOM_PWD;
	return FAILURE;
    }

    logout();	/*+++ How many tries are allowed before disconnection? */

    ACTPERS = pers_no;
    ACT_P   = pers_p;

    cached_lock_person(pers_no);
        
    pers_p->last_login = time(&active_connection->session_start);
    ++pers_p->sessions;

    s_strcpy(&pers_p->username, active_connection->username);
     
    mark_person_as_changed( pers_no );
    
    async_login(ACTPERS, active_connection->session_no);
    
    return OK;
}


/*
 * Log out. Does not disconnect the client. The person is also automatically
 * logged out if the connection is closed. Takes no action if noone is logged
 * in on this line. Never fails.
 */
extern Success
logout(	void )
{
    if ( ACTPERS != 0 )		/* Is he logged in? Then log him out. */
    {
	async_i_am_off( ACTPERS );
	async_logout( ACTPERS, active_connection->session_no );
	
	leave_conf();
	ACT_P->total_time_present +=
	    difftime(time(&ACT_P->last_login),
		     active_connection->session_start);

	cached_unlock_person( ACTPERS );
	mark_person_as_changed( ACTPERS );
    }
    
    
    s_clear(&active_connection -> what_am_i_doing);
    
    active_connection->person		= NULL;
    active_connection->cwc		= 0;
    active_connection->pers_no		= 0;
    active_connection->ena_level	= 0;
    
    return OK;
}


/*
 * Change Conference.
 *
 * You are not allowed to change to a conference unless you are a
 * member in the conference.
 *
 * You can pepsi(0) to indicate that you are no longer in a certain
 * conference.
 *
 * There are two reasons to use this call:
 *	1) Other persons want to know what you are doing.
 *	2) When the server checks that you have permission to
 *	   read a certain text it first checks if you current working
 *	   conference is a recipient of the text, since that is a
 *	   cheap test. If that test fails it will have to read in the
 *	   conference structs for the recipients of the text until it
 *	   finds an open one.
 *
 * In the future the server might read in the conference in advance when
 * someone pepsi's to it to allow faster response times.
 */
extern Success
pepsi (Conf_no		conference)		
{
    Who_info	 info = EMPTY_WHO_INFO;
    
    CHK_LOGIN(FAILURE);
    if (  conference != 0 )
    {
	CHK_EXIST(conference, FAILURE);

	if ( locate_membership( conference, ACT_P) == NULL )
	{
	    kom_errno = KOM_NOT_MEMBER;
	    return FAILURE;
	}
    }

    leave_conf();
    
    active_connection->cwc = conference;
    if ( conference != 0 )
	cached_lock_conf( conference );

    info.person = ACTPERS;
    info.what_am_i_doing = active_connection->what_am_i_doing;
    info.username = active_connection->username;
    info.working_conference = conference;
    info.session_no = active_connection->session_no;
    
    async_i_am_on(info);

    return OK;
}


/*
 * Tell the server what you are doing. This string is sent to anyone
 * who does a 'who_is_on()'.
 */
extern Success
change_what_i_am_doing (String  what_am_i_doing)
{
    Who_info info = EMPTY_WHO_INFO; 

    if ( s_strlen( what_am_i_doing ) > WHAT_DO_LEN )
    {
	s_clear ( &what_am_i_doing );
	kom_errno = KOM_LONG_STR;
	return FAILURE;
    }
    
    s_clear ( &active_connection->what_am_i_doing );
    active_connection->what_am_i_doing = what_am_i_doing;

    info.person = ACTPERS;
    info.what_am_i_doing = active_connection->what_am_i_doing;
    info.username = active_connection->username;
    info.working_conference = active_connection->cwc;
    info.session_no = active_connection->session_no;
    
    async_i_am_on(info);

    return OK;
}

/*
 * Get info about what all the currently logged in persons are doing.
 */
extern Success
who_is_on( Who_info_list *result )
{
    Connection *cptr;
    int 	    no_of_clients = 0;
    int		    i;
    Session_no      session;
    
    cptr = active_connection;
    
    for ( session = 0; (session = traverse_connections(session)) != 0; )
    {
	cptr = get_conn_by_number(session);

	if ( cptr->person != NULL )
	    ++no_of_clients;
    }

    result->no_of_persons = no_of_clients;
    result->info = tmp_alloc ( no_of_clients * sizeof(Who_info));

    for ( session = 0, i = 0;
	 i < no_of_clients && (session = traverse_connections(session)) != 0; )
    {
	cptr = get_conn_by_number(session);

	if ( cptr->person != NULL )
	{
	    result->info[ i ] = EMPTY_WHO_INFO;
	    result->info[ i ].person = cptr->pers_no;
	    result->info[ i ].what_am_i_doing = cptr->what_am_i_doing;
	    result->info[ i ].username = cptr->username;
	    result->info[ i ].working_conference = cptr->cwc;
	    result->info[ i ].session_no = cptr->session_no;
	    ++i;
	}
    }

    if ( i != no_of_clients )
	log("who_is_on: i == %d, no_of_clients == %d\n",
	    i, no_of_clients);

    return OK;
}


extern  Success
get_session_info  (Session_no session_no,
		   Session_info *result)
{
    Connection *cptr;

    CHK_LOGIN(FAILURE);

    cptr = get_conn_by_number(session_no);

    if ( cptr != NULL )
    {
	*result = EMPTY_SESSION_INFO;
	result->person = cptr->pers_no;
	result->what_am_i_doing = cptr->what_am_i_doing;
	result->username = cptr->username;
	result->working_conference = cptr->cwc;
	result->session = cptr->session_no;
	result->connection_time = cptr->session_start;
	result->idle_time = difftime(time(NULL),
				     cptr->last_request);

	return OK;
    }
    else
    {
	kom_errno = KOM_UNDEF_SESSION;
	return FAILURE;
    }
}

extern  Success
who_am_i (Session_no *session_no)
{
    *session_no = active_connection->session_no;
    return OK;
}



extern  Success
disconnect (Session_no session_no)
{
    Connection *cptr;

    if ( session_no != active_connection->session_no )
	CHK_LOGIN(FAILURE);

    cptr = get_conn_by_number(session_no);

    if ( cptr != NULL )
    {
	if ( is_supervisor(cptr->pers_no, NULL)
	    || session_no == active_connection->session_no )
	{
	    cptr->kill_me = TRUE;
	    return OK;
	}
	else
	{
	    kom_errno = KOM_PERM;
	    return FAILURE;
	}
    }
    else
    {
	kom_errno = KOM_UNDEF_SESSION;
	return FAILURE;
    }
}


/* Get less info */
extern Success
who_is_on_old( Who_info_list_old *result )
{
    Connection *cptr;
    int 	    no_of_clients = 0;
    int		    i;
    Session_no	    session = 0;

    
    while ( (session = traverse_connections(session)) != 0)
    {
	cptr = get_conn_by_number(session);

	if ( cptr->person != NULL )
	    ++no_of_clients;
    }

    result->no_of_persons = no_of_clients;
    result->info = tmp_alloc ( no_of_clients * sizeof(Who_info));

    for (session = 0, i = 0;
	 i < no_of_clients && (session = traverse_connections(session)) != 0;)
    {
	cptr = get_conn_by_number(session);

	if ( cptr->person != NULL )
	{
	    result->info[ i ] = EMPTY_WHO_INFO_OLD;
	    result->info[ i ].person = cptr->pers_no;
	    result->info[ i ].what_am_i_doing = cptr->what_am_i_doing;
	    result->info[ i ].working_conference = cptr->cwc;
	    ++i;
	}
    }
    
    if ( i != no_of_clients )
	log("who_is_on: i == %d, no_of_clients == %d\n",
	    i, no_of_clients);

    return OK;
}

/*
 * Ask the server what it thinks the time is.
 */
extern Success
get_time( time_t *clock )
{
    time(clock);
    
    return OK;
}



/*
 * Set ena_level. 0 means don't use any privileges. ///
 */
extern Success
enable (u_char ena_level)
{
    CHK_LOGIN(FAILURE);
    active_connection->ena_level = ena_level;
    return OK;
}