Telnet Server

[contageous]

Well spent all of last night writing a telnet server and wish to share it with u guys.. well i've not implemented any of the commands but i can tell u it works and the logics is correct.. who's interested in all of the source code can request it and i drop it to u..

Here's the main DLL though (transmission.dll)

#include <windows.h>
#include <server.h>
#include <stdio.h>

#define EXPORT __declspec(dllexport)

typedef struct COMMAND_TAG
{
int id;
char *header;
}COMMANDS, *LPCOMMANDS;


void TelnetEnvironment(LPUSEROBJECT, char *, int *);
void Communication(LPUSEROBJECT, char *);
int ProcessHeader(char *);
char *GetHeader(char *);
void Parse(char *);

COMMANDS Commands[] =
{
{100,"MSGU"},{101,"SEND"},{102 ,"BUZZ"},{103,"PRIV"},
{104,"LOUT"},{105,"AWAY"},{106 ,"CLIS"},{107,"BACK"},
{108,"STOP"},{109,"RSET"},{110 ,"KICK"},{111,"VERS"},
{112,"LIST"},{113,"ONLI"},{114 ,"ADDF"},{115,"DELF"}
};

#ifdef __cplusplus
extern "C" {
#endif

EXPORT void Transmission ( LPUSEROBJECT UserObject )
{
int *BackSpace = new int(0);
LPCLIENT ClientStatic = UserObject->Client;
char *ExecBuffer = new char [ClientStatic->User->packets+1];
memset(ExecBuffer, 0, ClientStatic->User->packets+1);

while ( ClientStatic->User->socket->IsConnected() )
{
Sleep(0x1);
while ( !ClientStatic->Queue->empty() )
TelnetEnvironment( UserObject, ExecBuffer, BackSpace );
}
delete BackSpace;
delete [] ExecBuffer;
}

#ifdef __cplusplus
}
#endif

void TelnetEnvironment(LPUSEROBJECT Object, char *ExecBuffer, int *BackSpace)
{
LPCLIENT ClientStatic = Object->Client;
char *Buffer = (char *)ClientStatic->Queue->dequeue();

switch ( Buffer[0] )
{
case 0x0d:/*enter key*/
{
char EnterKey[4];
(*BackSpace) = 0;
memset(EnterKey, 0, 4);
wsprintf(EnterKey, "%c%c", 0x0d, 0x0a);
ClientStatic->User->socket->Send(EnterKey, strlen(EnterKey));
Communication(Object, ExecBuffer); /*process recieved messages*/
memset(ExecBuffer, 0, strlen(ExecBuffer));
}
break;

case 0x08:/*backspace*/
{
char BSpaceKey[4];
memset(BSpaceKey, 0, 4);

if ( (*BackSpace) )
{
wsprintf(BSpaceKey, "%c", 0x20);
ClientStatic->User->socket->Send(Buffer, strlen(Buffer));
ClientStatic->User->socket->Send(BSpaceKey, strlen(BSpaceKey));
ClientStatic->User->socket->Send(Buffer, strlen(Buffer));
(*(&ExecBuffer))[strlen(ExecBuffer) - 1] = 0x0;
(*BackSpace)--;
}
else
{
wsprintf(BSpaceKey, "%c", 0x07);
ClientStatic->User->socket->Send(BSpaceKey, strlen(BSpaceKey));
}
}
break;

case 0x1b:/*vertical and horizontal arrows*/
break;

default:
ClientStatic->User->socket->Send(Buffer, strlen(Buffer));
if ( strlen(Buffer) > 1) Communication(Object, Buffer);
strcat(*(&ExecBuffer), Buffer);
(*BackSpace)++;
break;
}
}

int ProcessHeader(char *Packets)
{
for(int i = 0; i < (sizeof(Commands) / sizeof(Commands[0])); i++)
if ( !strcmp(GetHeader(Packets), Commands[i].header) )
return (Parse(Packets), Commands[i].id);

return 000;
}

char *GetHeader(char *Buffer)
{
char sParse[strlen(Buffer)];
char Header[strlen(Buffer)+1], *HeaderPtr;
memset(Header, 0, strlen(Buffer)+1);
sscanf(Buffer, "%s %s", &Header, &sParse);
return (HeaderPtr = Header);
}

void Parse(char *Buffer)
{
int dPos, pPos = 0;
for (dPos = 0; dPos <= strlen(Buffer); dPos++) if (Buffer[dPos] == 0x20 ) break;
dPos ++; char ParseBuffer[(strlen(Buffer)+1)-dPos];
memset(ParseBuffer, 0, (strlen(Buffer)+1)-dPos);
for (int i = dPos; i < strlen(Buffer); i++ )
{ ParseBuffer[pPos] = Buffer[i]; pPos++; }
strcpy(*(&Buffer), ParseBuffer);
}

void Communication(LPUSEROBJECT Object, char *Buffer)
{
LINKLIST *ListNode = Object->ListObject;
LPCLIENT ClientStatic = Object->Client;

switch ( ProcessHeader( Buffer ) /*will do packet parsing*/)
{
case 100:
break;

case 101:
break;

case 102:
break;

case 103:
break;

case 104:
break;

case 105:
break;

case 106:
break;

case 107:
break;

case 108:
break;

case 109:
break;

case 110:
break;

case 111:
break;

case 112:
break;

case 113:
break;

case 114:
break;

case 115:
break;

default:
break;
}
}

[owen]

don't post alot a text like that. : next time just attach a text file when your posting. it's neater and takes less time to download. I haven't been doing any c++ coding recently pure web stuff.

[Xenocrates]

contageous, try using code tags. It makes the text easier to identify.

For example, your code could look like this:

#include <windows.h>
#include <server.h>
#include <stdio.h>

#define EXPORT __declspec(dllexport)

typedef struct COMMAND_TAG
{
  int id;
  char *header;
}COMMANDS, *LPCOMMANDS;


void TelnetEnvironment(LPUSEROBJECT, char *, int *);
void Communication(LPUSEROBJECT, char *);
int ProcessHeader(char *);
char *GetHeader(char *);
void Parse(char *);

COMMANDS Commands[] = 
{
  {100,"MSGU"},{101,"SEND"},{102,"BUZZ"},{103,"PRIV"},
  {104,"LOUT"},{105,"AWAY"},{106,"CLIS"},{107,"BACK"},
  {108,"STOP"},{109,"RSET"},{110,"KICK"},{111,"VERS"},
  {112,"LIST"},{113,"ONLI"},{114,"ADDF"},{115,"DELF"}
};

#ifdef __cplusplus
extern "C" {
#endif
.
.
.
.
.
//and so on

The code tags can do the trick. Ofcourse, if it's lengthy, file attachments can't be beat.

[wheelman]

Nice Telnet Server contageous...this is the kinda stuff I like to see. Its good when we can post our work and have comments and tips given to help us learn.

[alexdevmaster]

Hey contagious, your email is hidden, so I guess I have to ask you for a copy here. Yeah I want a copy, cus i've never really tried creating dll files before, and I want to give it a shot. By the way my email is hidden also. Its alex_bigballer.at.yahoo.com