source: irc.c @ 2face62

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

/* The big hairy IRCd part of the project                               */

/*
  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 "crypting.h"
#include "ipc.h"

static gboolean irc_userping( gpointer _irc );

GSList *irc_connection_list = NULL;

static char *passchange (irc_t *irc, void *set, char *value) 
{
        irc_setpass (irc, value);
        return (NULL);
}

irc_t *irc_new( int fd )
{
        irc_t *irc;
        struct hostent *peer;
        unsigned int i;
        char buf[128];
#ifdef IPV6
        struct sockaddr_in6 sock[1];
#else
        struct sockaddr_in sock[1];
#endif
        
        irc = g_new0( irc_t, 1 );
        
        irc->fd = fd;
        irc->io_channel = g_io_channel_unix_new( fd );
#ifdef GLIB2
        g_io_channel_set_encoding (irc->io_channel, NULL, NULL);
        g_io_channel_set_buffered (irc->io_channel, FALSE);
        g_io_channel_set_flags( irc->io_channel, G_IO_FLAG_NONBLOCK, NULL );
#else
        fcntl( irc->fd, F_SETFL, O_NONBLOCK);
#endif
        irc->r_watch_source_id = g_io_add_watch( irc->io_channel, G_IO_IN | G_IO_ERR | G_IO_HUP, bitlbee_io_current_client_read, irc );
        
        irc->status = USTATUS_OFFLINE;
        irc->last_pong = gettime();
        
        irc->userhash = g_hash_table_new( g_str_hash, g_str_equal );
        irc->watches = g_hash_table_new( g_str_hash, g_str_equal );
        
        strcpy( irc->umode, UMODE );
        irc->mynick = g_strdup( ROOT_NICK );
        irc->channel = g_strdup( ROOT_CHAN );
        
        i = sizeof( *sock );
        
        if( global.conf->hostname )
                irc->myhost = g_strdup( global.conf->hostname );
#ifdef IPV6
        else if( getsockname( irc->fd, (struct sockaddr*) sock, &i ) == 0 && sock->sin6_family == AF_INETx )
        {
                if( ( peer = gethostbyaddr( (char*) &sock->sin6_addr, sizeof( sock->sin6_addr ), AF_INETx ) ) )
                        irc->myhost = g_strdup( peer->h_name );
                else if( inet_ntop( AF_INETx, &sock->sin6_addr, buf, sizeof( buf ) - 1 ) != NULL )
                        irc->myhost = g_strdup( ipv6_unwrap( buf ) );
        }
#else
        else if( getsockname( irc->fd, (struct sockaddr*) sock, &i ) == 0 && sock->sin_family == AF_INETx )
        {
                if( ( peer = gethostbyaddr( (char*) &sock->sin_addr, sizeof( sock->sin_addr ), AF_INETx ) ) )
                        irc->myhost = g_strdup( peer->h_name );
                else if( inet_ntop( AF_INETx, &sock->sin_addr, buf, sizeof( buf ) - 1 ) != NULL )
                        irc->myhost = g_strdup( buf );
        }
#endif
        
        i = sizeof( *sock );
#ifdef IPV6
        if( getpeername( irc->fd, (struct sockaddr*) sock, &i ) == 0 && sock->sin6_family == AF_INETx )
        {
                if( ( peer = gethostbyaddr( (char*) &sock->sin6_addr, sizeof( sock->sin6_addr ), AF_INETx ) ) )
                        irc->host = g_strdup( peer->h_name );
                else if( inet_ntop( AF_INETx, &sock->sin6_addr, buf, sizeof( buf ) - 1 ) != NULL )
                        irc->host = g_strdup( ipv6_unwrap( buf ) );
        }
#else
        if( getpeername( irc->fd, (struct sockaddr*) sock, &i ) == 0 && sock->sin_family == AF_INETx )
        {
                if( ( peer = gethostbyaddr( (char*) &sock->sin_addr, sizeof( sock->sin_addr ), AF_INETx ) ) )
                        irc->host = g_strdup( peer->h_name );
                else if( inet_ntop( AF_INETx, &sock->sin_addr, buf, sizeof( buf ) - 1 ) != NULL )
                        irc->host = g_strdup( buf );
        }
#endif
        
        /* Rare, but possible. */
        if( !irc->host ) irc->host = g_strdup( "localhost." );
        if( !irc->myhost ) irc->myhost = g_strdup( "localhost." );

        if( global.conf->ping_interval > 0 && global.conf->ping_timeout > 0 )
                irc->ping_source_id = g_timeout_add( global.conf->ping_interval * 1000, irc_userping, irc );
        
        irc_write( irc, ":%s NOTICE AUTH :%s", irc->myhost, "BitlBee-IRCd initialized, please go on" );

        irc_connection_list = g_slist_append( irc_connection_list, irc );
        
        set_add( irc, "away_devoice", "true",  set_eval_away_devoice );
        set_add( irc, "auto_connect", "true", set_eval_bool );
        set_add( irc, "auto_reconnect", "false", set_eval_bool );
        set_add( irc, "auto_reconnect_delay", "300", set_eval_int );
        set_add( irc, "buddy_sendbuffer", "false", set_eval_bool );
        set_add( irc, "buddy_sendbuffer_delay", "200", set_eval_int );
        set_add( irc, "charset", "iso8859-1", set_eval_charset );
        set_add( irc, "debug", "false", set_eval_bool );
        set_add( irc, "default_target", "root", NULL );
        set_add( irc, "display_namechanges", "false", set_eval_bool );
        set_add( irc, "handle_unknown", "root", NULL );
        set_add( irc, "lcnicks", "true", set_eval_bool );
        set_add( irc, "ops", "both", set_eval_ops );
        set_add( irc, "private", "true", set_eval_bool );
        set_add( irc, "query_order", "lifo", NULL );
        set_add( irc, "save_on_quit", "true", set_eval_bool );
        set_add( irc, "strip_html", "true", NULL );
        set_add( irc, "to_char", ": ", set_eval_to_char );
        set_add( irc, "typing_notice", "false", set_eval_bool );
        set_add( irc, "password", NULL, passchange);
        
        conf_loaddefaults( irc );
        
        return( irc );
}

void irc_abort( irc_t *irc )
{
        irc->status = USTATUS_SHUTDOWN;
        if( irc->sendbuffer )
        {
                g_source_remove( irc->r_watch_source_id );
                irc->r_watch_source_id = g_timeout_add_full( G_PRIORITY_HIGH, 1000, (GSourceFunc) irc_free, irc, NULL );
        }
        else
        {
                irc_free( irc );
        }
}

static gboolean irc_free_userhash( gpointer key, gpointer value, gpointer data )
{
        g_free( key );
        
        return( TRUE );
}

/* Because we have no garbage collection, this is quite annoying */
void irc_free(irc_t * irc)
{
        account_t *account, *accounttmp;
        user_t *user, *usertmp;
        nick_t *nick, *nicktmp;
        help_t *helpnode, *helpnodetmp;
        set_t *setnode, *setnodetmp;
        
        log_message( LOGLVL_INFO, "Destroying connection with fd %d", irc->fd );
        
        if( irc->status >= USTATUS_IDENTIFIED && set_getint( irc, "save_on_quit" ) ) 
                if( storage_save( irc, TRUE ) != STORAGE_OK )
                        irc_usermsg( irc, "Error while saving settings!" );
        
        if( irc->ping_source_id > 0 )
                g_source_remove( irc->ping_source_id );
        g_source_remove( irc->r_watch_source_id );
        if( irc->w_watch_source_id > 0 )
                g_source_remove( irc->w_watch_source_id );
        
        g_io_channel_unref( irc->io_channel );
        irc_connection_list = g_slist_remove( irc_connection_list, irc );
        
        for (account = irc->accounts; account; account = account->next)
                if (account->gc)
                        signoff(account->gc);
        
        g_free(irc->sendbuffer);
        g_free(irc->readbuffer);
        
        g_free(irc->nick);
        g_free(irc->user);
        g_free(irc->host);
        g_free(irc->realname);
        g_free(irc->password);
        
        g_free(irc->myhost);
        g_free(irc->mynick);
        
        g_free(irc->channel);
        
        while (irc->queries != NULL)
                query_del(irc, irc->queries);
        
        if (irc->accounts != NULL) {
                account = irc->accounts;
                while (account != NULL) {
                        g_free(account->user);
                        g_free(account->pass);
                        g_free(account->server);
                        accounttmp = account;
                        account = account->next;
                        g_free(accounttmp);
                }
        }
        
        if (irc->users != NULL) {
                user = irc->users;
                while (user != NULL) {
                        g_free(user->nick);
                        g_free(user->away);
                        g_free(user->handle);
                        if(user->user!=user->nick) g_free(user->user);
                        if(user->host!=user->nick) g_free(user->host);
                        if(user->realname!=user->nick) g_free(user->realname);
                        gaim_input_remove(user->sendbuf_timer);
                                        
                        usertmp = user;
                        user = user->next;
                        g_free(usertmp);
                }
        }
        
        g_hash_table_foreach_remove(irc->userhash, irc_free_userhash, NULL);
        g_hash_table_destroy(irc->userhash);
        
        g_hash_table_foreach_remove(irc->watches, irc_free_userhash, NULL);
        g_hash_table_destroy(irc->watches);
        
        if (irc->nicks != NULL) {
                nick = irc->nicks;
                while (nick != NULL) {
                        g_free(nick->nick);
                        g_free(nick->handle);
                                        
                        nicktmp = nick;
                        nick = nick->next;
                        g_free(nicktmp);
                }
        }
        if (irc->help != NULL) {
                helpnode = irc->help;
                while (helpnode != NULL) {
                        g_free(helpnode->string);
                        
                        helpnodetmp = helpnode;
                        helpnode = helpnode->next;
                        g_free(helpnodetmp);
                }
        }
        if (irc->set != NULL) {
                setnode = irc->set;
                while (setnode != NULL) {
                        g_free(setnode->key);
                        g_free(setnode->def);
                        g_free(setnode->value);
                        
                        setnodetmp = setnode;
                        setnode = setnode->next;
                        g_free(setnodetmp);
                }
        }
        g_free(irc);
        
        if( global.conf->runmode == RUNMODE_INETD || global.conf->runmode == RUNMODE_FORKDAEMON )
                g_main_quit( global.loop );
}

/* USE WITH CAUTION!
   Sets pass without checking */
void irc_setpass (irc_t *irc, const char *pass) 
{
        if (irc->password) g_free (irc->password);
        
        if (pass) {
                irc->password = g_strdup (pass);
                irc_usermsg (irc, "Password successfully changed");
        } else {
                irc->password = NULL;
        }
}

int irc_process( irc_t *irc )
{
        char **lines, *temp, **cmd;
        int i;

        if( irc->readbuffer != NULL )
        {
                lines = irc_tokenize( irc->readbuffer );
                
                for( i = 0; *lines[i] != '\0'; i ++ )
                {
                        if( lines[i+1] == NULL )
                        {
                                temp = g_strdup( lines[i] );
                                g_free( irc->readbuffer );
                                irc->readbuffer = temp;
                                i ++;
                                break;
                        }                       
                        
                        if( ( cmd = irc_parse_line( lines[i] ) ) == NULL )
                                continue;
                        if( !irc_exec( irc, cmd ) )
                        {
                                g_free( cmd );
                                g_free( lines );
                                return 0;
                        }
                        
                        g_free( cmd );
                }
                
                if( lines[i] != NULL )
                {
                        g_free( irc->readbuffer );
                        irc->readbuffer = NULL;
                }
                
                g_free( lines );
        }
        
        return 1;       
}

char **irc_tokenize( char *buffer )
{
        int i, j;
        char **lines;

        /* Count the number of elements we're gonna need. */
        for( i = 0, j = 1; buffer[i] != '\0'; i ++ )
        {
                if( buffer[i] == '\n' )
                        if( buffer[i+1] != '\r' && buffer[i+1] != '\n' )
                                j ++;
        }
        
        /* Allocate j+1 elements. */
        lines = g_new( char *, j + 1 );
        
        /* NULL terminate our list. */ 
        lines[j] = NULL;
        
        lines[0] = buffer;
        
        /* Split the buffer in several strings, using \r\n as our seperator, where \r is optional.
         * Although this is not in the RFC, some braindead ircds (newnet's) use this, so some clients might too. 
         */
        for( i = 0, j = 0; buffer[i] != '\0'; i ++)
        {
                if( buffer[i] == '\n' )
                {
                        buffer[i] = '\0';
                        
                        if( i > 0 && buffer[i-1] == '\r' )
                                buffer[i-1] = '\0';
                        if( buffer[i+1] != '\r' && buffer[i+1] != '\n' )
                                lines[++j] = buffer + i + 1;
                }
        }
        
        return( lines );
}

char **irc_parse_line( char *line )
{
        int i, j;
        char **cmd;
        
        /* Move the line pointer to the start of the command, skipping spaces and the optional prefix. */
        if( line[0] == ':' )
        {
                for( i = 0; line[i] != ' '; i ++ );
                line = line + i;
        }
        for( i = 0; line[i] == ' '; i ++ );
        line = line + i;
        
        /* If we're already at the end of the line, return. If not, we're going to need at least one element. */
        if( line[0] == '\0')
                return NULL;
        
        /* Count the number of char **cmd elements we're going to need. */
        j = 1;
        for( i = 0; line[i] != '\0'; i ++ )
        {
                if( line[i] == ' ' )
                {
                        j ++;
                        
                        if( line[i+1] == ':' )
                                break;
                }
        }       

        /* Allocate the space we need. */
        cmd = g_new( char *, j + 1 );
        cmd[j] = NULL;
        
        /* Do the actual line splitting, format is:
         * Input: "PRIVMSG #bitlbee :foo bar"
         * Output: cmd[0]=="PRIVMSG", cmd[1]=="#bitlbee", cmd[2]=="foo bar", cmd[3]==NULL
         */

        cmd[0] = line;
        for( i = 0, j = 0; line[i] != '\0'; i ++ )
        {
                if( line[i] == ' ' )
                {
                        line[i] = '\0';
                        cmd[++j] = line + i + 1;
                        
                        if( line[i+1] == ':' )
                        {
                                cmd[j] ++;
                                break;
                        }
                }
        }
        
        return cmd;
}

char *irc_build_line( char **cmd )
{
        int i, len;
        char *s;
        
        if( cmd[0] == NULL )
                return NULL;
        
        len = 1;
        for( i = 0; cmd[i]; i ++ )
                len += strlen( cmd[i] ) + 1;
        
        if( strchr( cmd[i-1], ' ' ) != NULL )
                len ++;
        
        s = g_new0( char, len + 1 );
        for( i = 0; cmd[i]; i ++ )
        {
                if( cmd[i+1] == NULL && strchr( cmd[i], ' ' ) != NULL )
                        strcat( s, ":" );
                
                strcat( s, cmd[i] );
                
                if( cmd[i+1] )
                        strcat( s, " " );
        }
        strcat( s, "\r\n" );
        
        return s;
}

void irc_reply( irc_t *irc, int code, char *format, ... )
{
        char text[IRC_MAX_LINE];
        va_list params;
        
        va_start( params, format );
        g_vsnprintf( text, IRC_MAX_LINE, format, params );
        va_end( params );
        irc_write( irc, ":%s %03d %s %s", irc->myhost, code, irc->nick?irc->nick:"*", text );
        
        return;
}

int irc_usermsg( irc_t *irc, char *format, ... )
{
        char text[1024];
        va_list params;
        char is_private = 0;
        user_t *u;
        
        u = user_find( irc, irc->mynick );
        if( u ) is_private = u->is_private;
        
        va_start( params, format );
        g_vsnprintf( text, sizeof( text ), format, params );
        va_end( params );
        
        return( irc_msgfrom( irc, u->nick, text ) );
}

void irc_write( irc_t *irc, char *format, ... ) 
{
        va_list params;

        va_start( params, format );
        irc_vawrite( irc, format, params );     
        va_end( params );

        return;

}

void irc_vawrite( irc_t *irc, char *format, va_list params )
{
        int size;
        char line[IRC_MAX_LINE];
        
        if( irc->quit )
                return;

        g_vsnprintf( line, IRC_MAX_LINE - 3, format, params );

        strip_newlines( line );
        strcat( line, "\r\n" );

        if( irc->sendbuffer != NULL ) {
                size = strlen( irc->sendbuffer ) + strlen( line );
                irc->sendbuffer = g_renew ( char, irc->sendbuffer, size + 1 );
                strcpy( ( irc->sendbuffer + strlen( irc->sendbuffer ) ), line );
        }
        else 
                irc->sendbuffer = g_strdup(line);       
        
        if( irc->w_watch_source_id == 0 )
        {
                irc->w_watch_source_id = g_io_add_watch( irc->io_channel, G_IO_OUT, bitlbee_io_current_client_write, irc );
        }
        
        return;
}

void irc_write_all( int now, char *format, ... )
{
        va_list params;
        GSList *temp;   
        
        va_start( params, format );
        
        temp = irc_connection_list;
        while( temp != NULL )
        {
                irc_t *irc = temp->data;
                
                if( now )
                {
                        g_free( irc->sendbuffer );
                        irc->sendbuffer = g_strdup( "\r\n" );
                }
                irc_vawrite( temp->data, format, params );
                if( now )
                {
                        bitlbee_io_current_client_write( irc->io_channel, G_IO_OUT, irc );
                }
                temp = temp->next;
        }
        
        va_end( params );
        return;
} 

void irc_names( irc_t *irc, char *channel )
{
        user_t *u = irc->users;
        char *s;
        int control = ( g_strcasecmp( channel, irc->channel ) == 0 );
        struct conversation *c = NULL;
        
        if( !control )
                c = conv_findchannel( channel );
        
        /* RFC's say there is no error reply allowed on NAMES, so when the
           channel is invalid, just give an empty reply. */
        
        if( control || c ) while( u )
        {
                if( u->online )
                {
                        if( u->gc && control )
                        {
                                if( set_getint( irc, "away_devoice" ) && !u->away )
                                        s = "+";
                                else
                                        s = "";
                                
                                irc_reply( irc, 353, "@ %s :%s%s", channel, s, u->nick );
                        }
                        else if( !u->gc )
                        {
                                if( strcmp( u->nick, irc->mynick ) == 0 && ( strcmp( set_getstr( irc, "ops" ), "root" ) == 0 || strcmp( set_getstr( irc, "ops" ), "both" ) == 0 ) )
                                        s = "@";
                                else if( strcmp( u->nick, irc->nick ) == 0 && ( strcmp( set_getstr( irc, "ops" ), "user" ) == 0 || strcmp( set_getstr( irc, "ops" ), "both" ) == 0 ) )
                                        s = "@";
                                else
                                        s = "";
                                
                                irc_reply( irc, 353, "@ %s :%s%s", channel, s, u->nick );
                        }
                }
                
                u = u->next;
        }
        
        /* For non-controlchannel channels (group conversations) only root and
           you are listed now. Time to show the channel people: */
        if( !control && c )
        {
                GList *l;
                
                for( l = c->in_room; l; l = l->next )
                        if( ( u = user_findhandle( c->gc, l->data ) ) )
                                irc_reply( irc, 353, "@ %s :%s%s", channel, "", u->nick );
        }
        
        irc_reply( irc, 366, "%s :End of /NAMES list", channel );
}

int irc_check_login( irc_t *irc )
{
        if( irc->user && irc->nick )
        {
                if( global.conf->authmode == AUTHMODE_CLOSED && irc->status < USTATUS_AUTHORIZED )
                {
                        irc_reply( irc, 464, ":This server is password-protected." );
                        return 0;
                }
                else
                {
                        irc_login( irc );
                        return 1;
                }
        }
        else
        {
                /* More information needed. */
                return 0;
        }
}

void irc_login( irc_t *irc )
{
        user_t *u;
        
        irc_reply( irc,   1, ":Welcome to the BitlBee gateway, %s", irc->nick );
        irc_reply( irc,   2, ":Host %s is running BitlBee " BITLBEE_VERSION " " ARCH "/" CPU ".", irc->myhost );
        irc_reply( irc,   3, ":%s", IRCD_INFO );
        irc_reply( irc,   4, "%s %s %s %s", irc->myhost, BITLBEE_VERSION, UMODES UMODES_PRIV, CMODES );
        irc_reply( irc,   5, "PREFIX=(ov)@+ CHANTYPES=#& CHANMODES=,,,%s NICKLEN=%d NETWORK=BitlBee CASEMAPPING=rfc1459 MAXTARGETS=1 WATCH=128 :are supported by this server", CMODES, MAX_NICK_LENGTH - 1 );
        irc_motd( irc );
        irc_umode_set( irc, "+" UMODE, 1 );

        u = user_add( irc, irc->mynick );
        u->host = g_strdup( irc->myhost );
        u->realname = g_strdup( ROOT_FN );
        u->online = 1;
        u->send_handler = root_command_string;
        u->is_private = 0; /* [SH] The channel is root's personal playground. */
        irc_spawn( irc, u );
        
        u = user_add( irc, NS_NICK );
        u->host = g_strdup( irc->myhost );
        u->realname = g_strdup( ROOT_FN );
        u->online = 0;
        u->send_handler = root_command_string;
        u->is_private = 1; /* [SH] NickServ is not in the channel, so should always /query. */
        
        u = user_add( irc, irc->nick );
        u->user = g_strdup( irc->user );
        u->host = g_strdup( irc->host );
        u->realname = g_strdup( irc->realname );
        u->online = 1;
        irc_spawn( irc, u );
        
        irc_usermsg( irc, "Welcome to the BitlBee gateway!\n\nIf you've never used BitlBee before, please do read the help information using the \x02help\x02 command. Lots of FAQ's are answered there." );
        
        if( global.conf->runmode == RUNMODE_FORKDAEMON )
                ipc_to_master_str( "CLIENT %s %s :%s\r\n", irc->host, irc->nick, irc->realname );
        
        irc->status = USTATUS_LOGGED_IN;
}

void irc_motd( irc_t *irc )
{
        int fd;
        
        fd = open( global.conf->motdfile, O_RDONLY );
        if( fd == -1 )
        {
                irc_reply( irc, 422, ":We don't need MOTDs." );
        }
        else
        {
                char linebuf[80];       /* Max. line length for MOTD's is 79 chars. It's what most IRC networks seem to do. */
                char *add, max;
                int len;
                
                linebuf[79] = len = 0;
                max = sizeof( linebuf ) - 1;
                
                irc_reply( irc, 375, ":- %s Message Of The Day - ", irc->myhost );
                while( read( fd, linebuf + len, 1 ) == 1 )
                {
                        if( linebuf[len] == '\n' || len == max )
                        {
                                linebuf[len] = 0;
                                irc_reply( irc, 372, ":- %s", linebuf );
                                len = 0;
                        }
                        else if( linebuf[len] == '%' )
                        {
                                read( fd, linebuf + len, 1 );
                                if( linebuf[len] == 'h' )
                                        add = irc->myhost;
                                else if( linebuf[len] == 'v' )
                                        add = BITLBEE_VERSION;
                                else if( linebuf[len] == 'n' )
                                        add = irc->nick;
                                else
                                        add = "%";
                                
                                strncpy( linebuf + len, add, max - len );
                                while( linebuf[++len] );
                        }
                        else if( len < max )
                        {
                                len ++;
                        }
                }
                irc_reply( irc, 376, ":End of MOTD" );
                closesocket( fd );
        }
}

void irc_topic( irc_t *irc, char *channel )
{
        if( g_strcasecmp( channel, irc->channel ) == 0 )
        {
                irc_reply( irc, 332, "%s :%s", channel, CONTROL_TOPIC );
        }
        else
        {
                struct conversation *c = conv_findchannel( channel );
                
                if( c )
                        irc_reply( irc, 332, "%s :BitlBee groupchat: \"%s\". Please keep in mind that root-commands won't work here. Have fun!", channel, c->title );
                else
                        irc_reply( irc, 331, "%s :No topic for this channel" );
        }
}

void irc_umode_set( irc_t *irc, char *s, int allow_priv )
{
        /* allow_priv: Set to 0 if s contains user input, 1 if you want
           to set a "privileged" mode (+o, +R, etc). */
        char m[256], st = 1, *t;
        int i;
        
        memset( m, 0, sizeof( m ) );
        
        for( t = irc->umode; *t; t ++ )
                m[(int)*t] = 1;
        
        for( t = s; *t; t ++ )
        {
                if( *t == '+' || *t == '-' )
                        st = *t == '+';
                else if( st == 0 || ( strchr( UMODES, *t ) || ( allow_priv && strchr( UMODES_PRIV, *t ) ) ) )
                        m[(int)*t] = st;
        }
        
        memset( irc->umode, 0, sizeof( irc->umode ) );
        
        for( i = 0; i < 256 && strlen( irc->umode ) < ( sizeof( irc->umode ) - 1 ); i ++ )
                if( m[i] )
                        irc->umode[strlen(irc->umode)] = i;
        
        irc_reply( irc, 221, "+%s", irc->umode );
}

void irc_spawn( irc_t *irc, user_t *u )
{
        irc_join( irc, u, irc->channel );
}

void irc_join( irc_t *irc, user_t *u, char *channel )
{
        char *nick;
        
        if( ( g_strcasecmp( channel, irc->channel ) != 0 ) || user_find( irc, irc->nick ) )
                irc_write( irc, ":%s!%s@%s JOIN :%s", u->nick, u->user, u->host, channel );
        
        if( nick_cmp( u->nick, irc->nick ) == 0 )
        {
                irc_write( irc, ":%s MODE %s +%s", irc->myhost, channel, CMODE );
                irc_names( irc, channel );
                irc_topic( irc, channel );
        }
        
        nick = g_strdup( u->nick );
        nick_lc( nick );
        if( g_hash_table_lookup( irc->watches, nick ) )
        {
                irc_reply( irc, 600, "%s %s %s %d :%s", u->nick, u->user, u->host, time( NULL ), "logged online" );
        }
        g_free( nick );
}

void irc_part( irc_t *irc, user_t *u, char *channel )
{
        irc_write( irc, ":%s!%s@%s PART %s :%s", u->nick, u->user, u->host, channel, "" );
}

void irc_kick( irc_t *irc, user_t *u, char *channel, user_t *kicker )
{
        irc_write( irc, ":%s!%s@%s KICK %s %s :%s", kicker->nick, kicker->user, kicker->host, channel, u->nick, "" );
}

void irc_kill( irc_t *irc, user_t *u )
{
        char *nick;
        
        irc_write( irc, ":%s!%s@%s QUIT :%s", u->nick, u->user, u->host, "Leaving..." );
        
        nick = g_strdup( u->nick );
        nick_lc( nick );
        if( g_hash_table_lookup( irc->watches, nick ) )
        {
                irc_reply( irc, 601, "%s %s %s %d :%s", u->nick, u->user, u->host, time( NULL ), "logged offline" );
        }
        g_free( nick );
}

int irc_send( irc_t *irc, char *nick, char *s, int flags )
{
        struct conversation *c = NULL;
        user_t *u = NULL;
        
        if( *nick == '#' || *nick == '&' )
        {
                if( !( c = conv_findchannel( nick ) ) )
                {
                        irc_reply( irc, 403, "%s :Channel does not exist", nick );
                        return( 0 );
                }
        }
        else
        {
                u = user_find( irc, nick );
                
                if( !u )
                {
                        if( irc->is_private )
                                irc_reply( irc, 401, "%s :Nick does not exist", nick );
                        else
                                irc_usermsg( irc, "Nick `%s' does not exist!", nick );
                        return( 0 );
                }
        }
        
        if( *s == 1 && s[strlen(s)-1] == 1 )
        {
                if( g_strncasecmp( s + 1, "ACTION", 6 ) == 0 )
                {
                        if( s[7] == ' ' ) s ++;
                        s += 3;
                        *(s++) = '/';
                        *(s++) = 'm';
                        *(s++) = 'e';
                        *(s++) = ' ';
                        s -= 4;
                        s[strlen(s)-1] = 0;
                }
                else if( g_strncasecmp( s + 1, "VERSION", 7 ) == 0 )
                {
                        u = user_find( irc, irc->mynick );
                        irc_privmsg( irc, u, "NOTICE", irc->nick, "", "\001VERSION BitlBee " BITLBEE_VERSION " " ARCH "/" CPU "\001" );
                        return( 1 );
                }
                else if( g_strncasecmp( s + 1, "PING", 4 ) == 0 )
                {
                        u = user_find( irc, irc->mynick );
                        irc_privmsg( irc, u, "NOTICE", irc->nick, "", s );
                        return( 1 );
                }
                else if( g_strncasecmp( s + 1, "TYPING", 6 ) == 0 )
                {
                        if( u && u->gc && u->gc->prpl->send_typing && strlen( s ) >= 10 )
                        {
                                time_t current_typing_notice = time( NULL );
                                
                                if( current_typing_notice - u->last_typing_notice >= 5 )
                                {
                                        u->gc->prpl->send_typing( u->gc, u->handle, s[8] == '1' );
                                        u->last_typing_notice = current_typing_notice;
                                }
                        }
                        return( 1 );
                }
                else
                {
                        irc_usermsg( irc, "Non-ACTION CTCP's aren't supported" );
                        return( 0 );
                }
        }
        
        if( u )
        {
                /* For the next message, we probably do have to send new notices... */
                u->last_typing_notice = 0;
                u->is_private = irc->is_private;
                
                if( u->is_private )
                {
                        if( !u->online )
                                irc_reply( irc, 301, "%s :%s", u->nick, "User is offline" );
                        else if( u->away )
                                irc_reply( irc, 301, "%s :%s", u->nick, u->away );
                }
                
                if( u->send_handler )
                        return( u->send_handler( irc, u, s, flags ) );
        }
        else if( c && c->gc && c->gc->prpl )
        {
                return( serv_send_chat( irc, c->gc, c->id, s ) );
        }
        
        return( 0 );
}

gboolean buddy_send_handler_delayed( gpointer data )
{
        user_t *u = data;
        
        u->sendbuf[u->sendbuf_len-2] = 0; /* Cut off the last newline */
        serv_send_im( u->gc->irc, u, u->sendbuf, u->sendbuf_flags );
        
        g_free( u->sendbuf );
        u->sendbuf = NULL;
        u->sendbuf_len = 0;
        u->sendbuf_timer = 0;
        u->sendbuf_flags = 0;
        
        return( FALSE );
}

int buddy_send_handler( irc_t *irc, user_t *u, char *msg, int flags )
{
        if( !u || !u->gc ) return( 0 );
        
        if( set_getint( irc, "buddy_sendbuffer" ) && set_getint( irc, "buddy_sendbuffer_delay" ) > 0 )
        {
                int delay;
                
                if( u->sendbuf_len > 0 && u->sendbuf_flags != flags)
                {
                        //Flush the buffer
                        g_source_remove( u->sendbuf_timer );
                        buddy_send_handler_delayed( u );
                }

                if( u->sendbuf_len == 0 )
                {
                        u->sendbuf_len = strlen( msg ) + 2;
                        u->sendbuf = g_new (char, u->sendbuf_len );
                        u->sendbuf[0] = 0;
                        u->sendbuf_flags = flags;
                }
                else
                {
                        u->sendbuf_len += strlen( msg ) + 1;
                        u->sendbuf = g_renew ( char, u->sendbuf, u->sendbuf_len );
                }
                
                strcat( u->sendbuf, msg );
                strcat( u->sendbuf, "\n" );
                
                delay = set_getint( irc, "buddy_sendbuffer_delay" );
                if( delay <= 5 )
                        delay *= 1000;
                
                if( u->sendbuf_timer > 0 )
                        g_source_remove( u->sendbuf_timer );
                u->sendbuf_timer = g_timeout_add( delay, buddy_send_handler_delayed, u );
                
                return( 1 );
        }
        else
        {
                return( serv_send_im( irc, u, msg, flags ) );
        }
}

int irc_privmsg( irc_t *irc, user_t *u, char *type, char *to, char *prefix, char *msg )
{
        char last = 0;
        char *s = msg, *line = msg;
        
        /* The almighty linesplitter .. woohoo!! */
        while( !last )
        {
                if( *s == '\r' && *(s+1) == '\n' )
                        *(s++) = 0;
                if( *s == '\n' )
                {
                        last = s[1] == 0;
                        *s = 0;
                }
                else
                {
                        last = s[0] == 0;
                }
                if( *s == 0 )
                {
                        if( g_strncasecmp( line, "/me ", 4 ) == 0 && ( !prefix || !*prefix ) && g_strcasecmp( type, "PRIVMSG" ) == 0 )
                        {
                                irc_write( irc, ":%s!%s@%s %s %s :\001ACTION %s\001", u->nick, u->user, u->host,
                                           type, to, line + 4 );
                        }
                        else
                        {
                                irc_write( irc, ":%s!%s@%s %s %s :%s%s", u->nick, u->user, u->host,
                                           type, to, prefix ? prefix : "", line );
                        }
                        line = s + 1;
                }
                s ++;
        }
        
        return( 1 );
}

int irc_msgfrom( irc_t *irc, char *nick, char *msg )
{
        user_t *u = user_find( irc, nick );
        static char *prefix = NULL;
        
        if( !u ) return( 0 );
        if( prefix && *prefix ) g_free( prefix );
        
        if( !u->is_private && nick_cmp( u->nick, irc->mynick ) != 0 )
        {
                int len = strlen( irc->nick) + 3;
                prefix = g_new (char, len );
                g_snprintf( prefix, len, "%s%s", irc->nick, set_getstr( irc, "to_char" ) );
                prefix[len-1] = 0;
        }
        else
        {
                prefix = "";
        }
        
        return( irc_privmsg( irc, u, "PRIVMSG", u->is_private ? irc->nick : irc->channel, prefix, msg ) );
}

int irc_noticefrom( irc_t *irc, char *nick, char *msg )
{
        user_t *u = user_find( irc, nick );
        
        if( u )
                return( irc_privmsg( irc, u, "NOTICE", irc->nick, "", msg ) );
        else
                return( 0 );
}

/* Returns 0 if everything seems to be okay, a number >0 when there was a
   timeout. The number returned is the number of seconds we received no
   pongs from the user. When not connected yet, we don't ping but drop the
   connection when the user fails to connect in IRC_LOGIN_TIMEOUT secs. */
static gboolean irc_userping( gpointer _irc )
{
        irc_t *irc = _irc;
        int rv = 0;
        
        if( irc->status < USTATUS_LOGGED_IN )
        {
                if( gettime() > ( irc->last_pong + IRC_LOGIN_TIMEOUT ) )
                        rv = gettime() - irc->last_pong;
        }
        else
        {
                if( ( gettime() > ( irc->last_pong + global.conf->ping_interval ) ) && !irc->pinging )
                {
                        irc_write( irc, "PING :%s", IRC_PING_STRING );
                        irc->pinging = 1;
                }
                else if( gettime() > ( irc->last_pong + global.conf->ping_timeout ) )
                {
                        rv = gettime() - irc->last_pong;
                }
        }
        
        if( rv > 0 )
        {
                irc_write( irc, "ERROR :Closing Link: Ping Timeout: %d seconds", rv );
                irc_free( irc );
                return FALSE;
        }
        
        return TRUE;
}