source: ipc.c @ 48721c3

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2004 Wilmer van der Gaast and others                *
  \********************************************************************/

/* IPC - communication between BitlBee processes                        */

/*
  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "bitlbee.h"
#include "ipc.h"
#include "commands.h"

GSList *child_list = NULL;


static int ipc_master_cmd_die( irc_t *irc, char **cmd )
{
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
                ipc_to_children_str( "DIE\r\n" );
        
        bitlbee_shutdown( NULL );
        
        return 1;
}

static int ipc_master_cmd_rehash( irc_t *irc, char **cmd )
{
        runmode_t oldmode;
        
        oldmode = global.conf->runmode;
        
        g_free( global.conf );
        global.conf = conf_load( 0, NULL );
        
        if( global.conf->runmode != oldmode )
        {
                log_message( LOGLVL_WARNING, "Can't change RunMode setting at runtime, restoring original setting" );
                global.conf->runmode = oldmode;
        }
        
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
                ipc_to_children( cmd );
        
        return 1;
}

static const command_t ipc_master_commands[] = {
        { "die",        0, ipc_master_cmd_die,        0 },
        { "wallops",    1, NULL,                      IPC_CMD_TO_CHILDREN },
        { "lilo",       1, NULL,                      IPC_CMD_TO_CHILDREN },
        { "rehash",     0, ipc_master_cmd_rehash,     0 },
        { "kill",       2, NULL,                      IPC_CMD_TO_CHILDREN },
        { NULL }
};


static int ipc_child_cmd_die( irc_t *irc, char **cmd )
{
        bitlbee_shutdown( NULL );
        
        return 1;
}

static int ipc_child_cmd_wallops( irc_t *irc, char **cmd )
{
        if( irc->status < USTATUS_LOGGED_IN )
                return 1;
        
        if( strchr( irc->umode, 'w' ) )
                irc_write( irc, ":%s WALLOPS :%s", irc->myhost, cmd[1] );
        
        return 1;
}

static int ipc_child_cmd_lilo( irc_t *irc, char **cmd )
{
        if( irc->status < USTATUS_LOGGED_IN )
                return 1;
        
        if( strchr( irc->umode, 's' ) )
                irc_write( irc, ":%s NOTICE %s :%s", irc->myhost, irc->nick, cmd[1] );
        
        return 1;
}

static int ipc_child_cmd_rehash( irc_t *irc, char **cmd )
{
        runmode_t oldmode;
        
        oldmode = global.conf->runmode;
        
        g_free( global.conf );
        global.conf = conf_load( 0, NULL );
        
        global.conf->runmode = oldmode;
        
        return 1;
}

static int ipc_child_cmd_kill( irc_t *irc, char **cmd )
{
        if( irc->status < USTATUS_LOGGED_IN )
                return 1;
        
        if( nick_cmp( cmd[1], irc->nick ) != 0 )
                return 1;       /* It's not for us. */
        
        irc_write( irc, ":%s!%s@%s KILL %s :%s", irc->mynick, irc->mynick, irc->myhost, irc->nick, cmd[2] );
        g_io_channel_close( irc->io_channel );
        
        return 0;
}

static const command_t ipc_child_commands[] = {
        { "die",        0, ipc_child_cmd_die,         0 },
        { "wallops",    1, ipc_child_cmd_wallops,     0 },
        { "lilo",       1, ipc_child_cmd_lilo,        0 },
        { "rehash",     0, ipc_child_cmd_rehash,      0 },
        { "kill",       2, ipc_child_cmd_kill,        0 },
        { NULL }
};


static void ipc_command_exec( void *data, char **cmd, const command_t *commands )
{
        int i;
        
        if( !cmd[0] )
                return;
        
        for( i = 0; commands[i].command; i ++ )
                if( g_strcasecmp( commands[i].command, cmd[0] ) == 0 )
                {
                        if( commands[i].flags & IPC_CMD_TO_CHILDREN )
                                ipc_to_children( cmd );
                        else
                                commands[i].execute( data, cmd );
                        
                        return;
                }
}

static char *ipc_readline( int fd )
{
        char *buf, *eol;
        int size;
        
        buf = g_new0( char, 513 );
        
        /* Because this is internal communication, it should be pretty safe
           to just peek at the message, find its length (by searching for the
           end-of-line) and then just read that message. With internal
           sockets and limites message length, messages should always be
           complete. Saves us quite a lot of code and buffering. */
        size = recv( fd, buf, 512, MSG_PEEK );
        if( size == 0 || ( size < 0 && !sockerr_again() ) )
                return NULL;
        else
                buf[size] = 0;
        
        eol = strstr( buf, "\r\n" );
        if( eol == NULL )
                return NULL;
        else
                size = eol - buf + 2;
        
        g_free( buf );
        buf = g_new0( char, size + 1 );
        
        if( recv( fd, buf, size, 0 ) != size )
                return NULL;
        else
                buf[size-2] = 0;
        
        return buf;
}

void ipc_master_read( gpointer data, gint source, GaimInputCondition cond )
{
        char *buf, **cmd;
        
        if( ( buf = ipc_readline( source ) ) )
        {
                cmd = irc_parse_line( buf );
                if( cmd )
                        ipc_command_exec( data, cmd, ipc_master_commands );
        }
        else
        {
                GSList *l;
                struct bitlbee_child *c;
                
                for( l = child_list; l; l = l->next )
                {
                        c = l->data;
                        if( c->ipc_fd == source )
                        {
                                close( c->ipc_fd );
                                gaim_input_remove( c->ipc_inpa );
                                g_free( c );
                                
                                child_list = g_slist_remove( child_list, l );
                                
                                break;
                        }
                }
        }
}

void ipc_child_read( gpointer data, gint source, GaimInputCondition cond )
{
        char *buf, **cmd;
        
        if( ( buf = ipc_readline( source ) ) )
        {
                cmd = irc_parse_line( buf );
                if( cmd )
                        ipc_command_exec( data, cmd, ipc_child_commands );
        }
        else
        {
                gaim_input_remove( global.listen_watch_source_id );
                close( global.listen_socket );
                
                global.listen_socket = -1;
        }
}

void ipc_to_master( char **cmd )
{
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                char *s = irc_build_line( cmd );
                ipc_to_master_str( s );
                g_free( s );
        }
        else if( global.conf->runmode == RUNMODE_DAEMON )
        {
                ipc_command_exec( NULL, cmd, ipc_master_commands );
        }
}

void ipc_to_master_str( char *msg_buf )
{
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                write( global.listen_socket, msg_buf, strlen( msg_buf ) );
        }
        else if( global.conf->runmode == RUNMODE_DAEMON )
        {
                char *s, **cmd;
                
                /* irc_parse_line() wants a read-write string, so get it one: */
                s = g_strdup( msg_buf );
                cmd = irc_parse_line( s );
                
                ipc_command_exec( NULL, cmd, ipc_master_commands );
                
                g_free( cmd );
                g_free( s );
        }
}

void ipc_to_children( char **cmd )
{
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                char *msg_buf = irc_build_line( cmd );
                ipc_to_children_str( msg_buf );
                g_free( msg_buf );
        }
        else if( global.conf->runmode == RUNMODE_DAEMON )
        {
                GSList *l;
                
                for( l = irc_connection_list; l; l = l->next )
                        ipc_command_exec( l->data, cmd, ipc_child_commands );
        }
}

void ipc_to_children_str( char *msg_buf )
{
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
        {
                int msg_len = strlen( msg_buf );
                GSList *l;
                
                for( l = child_list; l; l = l->next )
                {
                        struct bitlbee_child *c = l->data;
                        write( c->ipc_fd, msg_buf, msg_len );
                }
        }
        else if( global.conf->runmode == RUNMODE_DAEMON )
        {
                char *s, **cmd;
                
                /* irc_parse_line() wants a read-write string, so get it one: */
                s = g_strdup( msg_buf );
                cmd = irc_parse_line( s );
                
                ipc_to_children( cmd );
                
                g_free( cmd );
                g_free( s );
        }
}