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Copyover with Kavir protocol snippet

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#1 Apr 1, 2018, 6:11 am Last edited Apr 1, 2018, 6:12 am by Vladaar

Vladaar
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Anyone have any luck with getting copyover not to crash with the snippet using his copyoverget copyoverset functions?

I am saving mudclient to playerfile now, I suppose I could take out the ability for MSDP with copyover. Using old copyover code doesn't crash, but I am at least getting a core it so worth giving it a go, to do it as he intended.

#0 0x00000000004a22c9 in write_to_buffer (d=d@entry=0x3b44e20, txt=0x8ec720 <colorize(char const*, descriptor_data*)::result> "\033[0;34m",
length=length@entry=0) at comm.c:1979
1979 if ( d->pProtocol->WriteOOB > 0 )
(gdb) bt
#0 0x00000000004a22c9 in write_to_buffer (d=d@entry=0x3b44e20, txt=0x8ec720 <colorize(char const*, descriptor_data*)::result> "\033[0;34m",
length=length@entry=0) at comm.c:1979
#1 0x0000000000498da0 in send_to_desc (txt=<optimized out>, d=0x3b44e20) at color.c:1577
#2 0x0000000000498dd7 in send_to_char (txt=<optimized out>, ch=ch@entry=0x3b42920) at color.c:1593
#3 0x0000000000498e12 in set_char_color (AType=AType@entry=44, ch=ch@entry=0x3b42920) at color.c:1490
#4 0x00000000004a3fb5 in act (AType=AType@entry=44, format=format@entry=0x63ff00 "A puff of ethereal smoke dissipates around you!",
ch=0x3b42920, arg1=arg1@entry=0x0, arg2=arg2@entry=0x0, type=type@entry=3) at comm.c:2884
#5 0x00000000004a95ab in copyover_recover () at copyover.c:385
#6 0x00000000004a7e27 in main (argc=<optimized out>, argv=<optimized out>

at comm.c:812
(gdb) frame 0
#0 0x00000000004a22c9 in write_to_buffer (d=d@entry=0x3b44e20, txt=0x8ec720 <colorize(char const*, descriptor_data*)::result> "\033[0;34m",
length=length@entry=0) at comm.c:1979
1979 if ( d->pProtocol->WriteOOB > 0 )
(gdb) list
1974 return;
1975
1976
1977 txt = ProtocolOutput( d, txt, &length );
1978
1979 if ( d->pProtocol->WriteOOB > 0 )
1980 --d->pProtocol->WriteOOB;
1981
1982
1983 /*
(gdb)

(gdb) print txt
$1 = 0x8ec720 <colorize(char const*, descriptor_data*)::result> "\033[0;34m"
(gdb) print &length
$2 = (size_t *) 0x7ffe16ef0ce8
(gdb) print d->pProtocol
$3 = (protocol_t *) 0x0
(gdb) print d
$4 = (DESCRIPTOR_DATA *) 0x3b44e20
(gdb) print d->pProtocol->WriteOOB
Cannot access memory at address 0x0
(gdb)

For some reason, it seems the d->pProtocol optimizes out.

If anyone wants to help with debugging I'd appreciate it. Thanks!

#2 Apr 1, 2018, 7:53 am Last edited Apr 1, 2018, 7:53 am by joeyfogas

joeyfogas
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never been good with gdb

#3 Apr 1, 2018, 12:32 pm Last edited Apr 1, 2018, 12:40 pm by Vladaar

Vladaar
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hrm, maybe it's because d->character is not const but pProtocol->apDescriptor is const?

There is definitely a issue in write_to_buffer or ProtocolOutput maybe more likely as it totally looses d at

txt = ProtocolOutput( d, txt, &length );

if ( d->pProtocol->WriteOOB > 0 )
--d->pProtocol->WriteOOB;

Which my write_to_buffer looks like

void write_to_buffer( DESCRIPTOR_DATA * d, const char *txt, size_t length )
{
   if( !d )
   {
      bug( "Write_to_buffer: NULL descriptor" );
      return;
   }

   /*
    * Normally a bug... but can happen if loadup is used.
    */
   if( !d->outbuf )
      return;


    txt = ProtocolOutput( d, txt, &length );

    if ( d->pProtocol->WriteOOB > 0 )
        --d->pProtocol->WriteOOB;


   /*
    * Find length in case caller didn't.
    */
   if( length <= 0 )
      length = strlen( txt );

ProtocolOutput looks like

const char *ProtocolOutput( descriptor_t *apDescriptor, const char *apData, size_t *apLength )
{
   static char Result[MAX_OUTPUT_BUFFER+1];
   const char Tab[] = "\t";
   const char MSP[] = "!!";
   const char MXPStart[] = "\033[1z<";
   const char MXPStop[] = ">\033[7z";
   const char LinkStart[] = "\033[1z<send>\033[7z";
   const char LinkStop[] = "\033[1z</send>\033[7z";

   bool_t bTerminate = false, bUseMXP = false, bUseMSP = false;
#ifdef COLOUR_CHAR
   bool_t bColourOn = COLOUR_ON_BY_DEFAULT;
#endif /* COLOUR_CHAR */
   int i = 0; /* Index values */
   size_t j = 0;
   protocol_t *pProtocol = apDescriptor ? apDescriptor->pProtocol : NULL;
  if ( pProtocol == NULL || apData == NULL )
      return apData;

   /* Strip !!SOUND() triggers if they support MSP or are using sound */
/*   if ( pProtocol->bMSP || pProtocol->pVariables[eMSDP_SOUND]->ValueInt )
      bUseMSP = true;
*/
   for ( ; i < MAX_OUTPUT_BUFFER && apData[j] != '\0' && !bTerminate && 
      (*apLength <= 0 || j < *apLength); ++j )
   {
      if ( apData[j] == '\t' )
      {
         const char *pCopyFrom = NULL;

         switch ( apData[++j] )
         {
            case '\t': /* Two tabs in a row will display an actual tab */
               pCopyFrom = Tab;
               break;

#4 Apr 2, 2018, 5:18 am

Vladaar
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It's definitely protocoloutput it's loosing descriptor in.

#5 Apr 2, 2018, 2:33 pm

Vladaar
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Leia gave me answer I was looking for.

Needed to add d->pProtocol = ProtocolCreate( ); to copyover_recover so that the descriptor would persist.

#6 Apr 3, 2018, 6:24 pm

Vladaar
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Check it out guys. It is working awesome now

http://6dragons.tk/MushClient.png

#7 Apr 3, 2018, 8:14 pm

Remcon
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JoinedJul 26, 2005

glad you got it working man