source: protocols/msn/msn_util.c @ 0e7ab64

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

/* MSN module - Miscellaneous utilities                                 */

/*
  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
*/

#include "nogaim.h"
#include "msn.h"
#include <ctype.h>

int msn_write( struct im_connection *ic, char *s, int len )
{
        struct msn_data *md = ic->proto_data;
        int st;
        
        st = write( md->fd, s, len );
        if( st != len )
        {
                imcb_error( ic, "Short write() to main server" );
                imc_logout( ic, TRUE );
                return( 0 );
        }
        
        return( 1 );
}

int msn_logged_in( struct im_connection *ic )
{
        imcb_connected( ic );
        
        return( 0 );
}

int msn_buddy_list_add( struct im_connection *ic, char *list, char *who, char *realname_ )
{
        struct msn_data *md = ic->proto_data;
        char buf[1024], *realname;
        
        realname = msn_http_encode( realname_ );
        
        g_snprintf( buf, sizeof( buf ), "ADD %d %s %s %s\r\n", ++md->trId, list, who, realname );
        if( msn_write( ic, buf, strlen( buf ) ) )
        {
                g_free( realname );
                
                return( 1 );
        }
        
        g_free( realname );
        
        return( 0 );
}

int msn_buddy_list_remove( struct im_connection *ic, char *list, char *who )
{
        struct msn_data *md = ic->proto_data;
        char buf[1024];
        
        g_snprintf( buf, sizeof( buf ), "REM %d %s %s\r\n", ++md->trId, list, who );
        if( msn_write( ic, buf, strlen( buf ) ) )
                return( 1 );
        
        return( 0 );
}

struct msn_buddy_ask_data
{
        struct im_connection *ic;
        char *handle;
        char *realname;
};

static void msn_buddy_ask_yes( gpointer w, struct msn_buddy_ask_data *bla )
{
        msn_buddy_list_add( bla->ic, "AL", bla->handle, bla->realname );
        
        if( imcb_find_buddy( bla->ic, bla->handle ) == NULL )
                imcb_ask_add( bla->ic, bla->handle, NULL );
        
        g_free( bla->handle );
        g_free( bla->realname );
        g_free( bla );
}

static void msn_buddy_ask_no( gpointer w, struct msn_buddy_ask_data *bla )
{
        msn_buddy_list_add( bla->ic, "BL", bla->handle, bla->realname );
        
        g_free( bla->handle );
        g_free( bla->realname );
        g_free( bla );
}

void msn_buddy_ask( struct im_connection *ic, char *handle, char *realname )
{
        struct msn_buddy_ask_data *bla = g_new0( struct msn_buddy_ask_data, 1 );
        char buf[1024];
        
        bla->ic = ic;
        bla->handle = g_strdup( handle );
        bla->realname = g_strdup( realname );
        
        g_snprintf( buf, sizeof( buf ),
                    "The user %s (%s) wants to add you to his/her buddy list.",
                    handle, realname );
        imcb_ask( ic, buf, bla, msn_buddy_ask_yes, msn_buddy_ask_no );
}

char *msn_findheader( char *text, char *header, int len )
{
        int hlen = strlen( header ), i;
        char *ret;
        
        if( len == 0 )
                len = strlen( text );
        
        i = 0;
        while( ( i + hlen ) < len )
        {
                /* Maybe this is a bit over-commented, but I just hate this part... */
                if( g_strncasecmp( text + i, header, hlen ) == 0 )
                {
                        /* Skip to the (probable) end of the header */
                        i += hlen;
                        
                        /* Find the first non-[: \t] character */
                        while( i < len && ( text[i] == ':' || text[i] == ' ' || text[i] == '\t' ) ) i ++;
                        
                        /* Make sure we're still inside the string */
                        if( i >= len ) return( NULL );
                        
                        /* Save the position */
                        ret = text + i;
                        
                        /* Search for the end of this line */
                        while( i < len && text[i] != '\r' && text[i] != '\n' ) i ++;
                        
                        /* Make sure we're still inside the string */
                        if( i >= len ) return( NULL );
                        
                        /* Copy the found data */
                        return( g_strndup( ret, text + i - ret ) );
                }
                
                /* This wasn't the header we were looking for, skip to the next line. */
                while( i < len && ( text[i] != '\r' && text[i] != '\n' ) ) i ++;
                while( i < len && ( text[i] == '\r' || text[i] == '\n' ) ) i ++;
                
                /* End of headers? */
                if( strncmp( text + i - 2, "\n\n", 2 ) == 0 ||
                    strncmp( text + i - 4, "\r\n\r\n", 4 ) == 0 ||
                    strncmp( text + i - 2, "\r\r", 2 ) == 0 )
                {
                        break;
                }
        }
        
        return( NULL );
}

/* *NOT* thread-safe, but that's not a problem for now... */
char **msn_linesplit( char *line )
{
        static char **ret = NULL;
        static int size = 3;
        int i, n = 0;
        
        if( ret == NULL )
                ret = g_new0( char*, size );
        
        for( i = 0; line[i] && line[i] == ' '; i ++ );
        if( line[i] )
        {
                ret[n++] = line + i;
                for( i ++; line[i]; i ++ )
                {
                        if( line[i] == ' ' )
                                line[i] = 0;
                        else if( line[i] != ' ' && !line[i-1] )
                                ret[n++] = line + i;
                        
                        if( n >= size )
                                ret = g_renew( char*, ret, size += 2 );
                }
        }
        ret[n] = NULL;
        
        return( ret );
}

/* This one handles input from a MSN Messenger server. Both the NS and SB servers usually give
   commands, but sometimes they give additional data (payload). This function tries to handle
   this all in a nice way and send all data to the right places. */

/* Return values: -1: Read error, abort connection.
                   0: Command reported error; Abort *immediately*. (The connection does not exist anymore)
                   1: OK */

int msn_handler( struct msn_handler_data *h )
{
        int st;
        
        h->rxq = g_renew( char, h->rxq, h->rxlen + 1024 );
        st = read( h->fd, h->rxq + h->rxlen, 1024 );
        h->rxlen += st;
        
        if( st <= 0 )
                return( -1 );
        
        while( st )
        {
                int i;
                
                if( h->msglen == 0 )
                {
                        for( i = 0; i < h->rxlen; i ++ )
                        {
                                if( h->rxq[i] == '\r' || h->rxq[i] == '\n' )
                                {
                                        char *cmd_text, **cmd;
                                        int count;
                                        
                                        cmd_text = g_strndup( h->rxq, i );
                                        cmd = msn_linesplit( cmd_text );
                                        for( count = 0; cmd[count]; count ++ );
                                        st = h->exec_command( h->data, cmd, count );
                                        g_free( cmd_text );
                                        
                                        /* If the connection broke, don't continue. We don't even exist anymore. */
                                        if( !st )
                                                return( 0 );
                                        
                                        if( h->msglen )
                                                h->cmd_text = g_strndup( h->rxq, i );
                                        
                                        /* Skip to the next non-emptyline */
                                        while( i < h->rxlen && ( h->rxq[i] == '\r' || h->rxq[i] == '\n' ) ) i ++;
                                        
                                        break;
                                }
                        }
                        
                        /* If we reached the end of the buffer, there's still an incomplete command there.
                           Return and wait for more data. */
                        if( i == h->rxlen && h->rxq[i-1] != '\r' && h->rxq[i-1] != '\n' )
                                break;
                }
                else
                {
                        char *msg, **cmd;
                        int count;
                        
                        /* Do we have the complete message already? */
                        if( h->msglen > h->rxlen )
                                break;
                        
                        msg = g_strndup( h->rxq, h->msglen );
                        cmd = msn_linesplit( h->cmd_text );
                        for( count = 0; cmd[count]; count ++ );
                        
                        st = h->exec_message( h->data, msg, h->msglen, cmd, count );
                        g_free( msg );
                        g_free( h->cmd_text );
                        h->cmd_text = NULL;
                        
                        if( !st )
                                return( 0 );
                        
                        i = h->msglen;
                        h->msglen = 0;
                }
                
                /* More data after this block? */
                if( i < h->rxlen )
                {
                        char *tmp;
                        
                        tmp = g_memdup( h->rxq + i, h->rxlen - i );
                        g_free( h->rxq );
                        h->rxq = tmp;
                        h->rxlen -= i;
                        i = 0;
                }
                else
                /* If not, reset the rx queue and get lost. */
                {
                        g_free( h->rxq );
                        h->rxq = g_new0( char, 1 );
                        h->rxlen = 0;
                        return( 1 );
                }
        }
        
        return( 1 );
}

/* The difference between this function and the normal http_encode() function
   is that this one escapes every 7-bit ASCII character because this is said
   to avoid some lame server-side checks when setting a real-name. Also,
   non-ASCII characters are not escaped because MSN servers don't seem to
   appreciate that! */
char *msn_http_encode( const char *input )
{
        char *ret, *s;
        int i;
        
        ret = s = g_new0( char, strlen( input ) * 3 + 1 );
        for( i = 0; input[i]; i ++ )
                if( input[i] & 128 )
                {
                        *s = input[i];
                        s ++;
                }
                else
                {
                        g_snprintf( s, 4, "%%%02X", input[i] );
                        s += 3;
                }
        
        return ret;
}