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telnet_phases.cpp
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telnet_phases.cpp
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// telnet_phases.cpp - handle telnet phases in incoming text stream
#include "stdafx.h"
#include "MUSHclient.h"
#include "doc.h"
/* Phases for processing input stream ...
To allow for these to be broken between packets we only do one
character at a time, and maintain a "state" (Phase) which indicates
how far through the sequence we are.
The two "triggering" codes we might get in normal text (ie. phase NONE) are
ESC or IAC.
Tested (5 Feb 2010):
* MCCP v1
* MCCP v2
* IAC GA \ff\f9
* IAC EOR \ff\ef
* IAC IAC inside subnegotiation \FF\FD\66 \ff\fa\66hello\ff\ffboys\ff\f0
* IAC IAC in normal text what\ff\ffever
* MXP
* Charset: \FF\FD\2A \ff\fa\2A\01,UTF-8,US-ASCII\ff\f0
* terminal type: \FF\FD\18 \ff\fa\18\01\ff\f0
* NAWS: \FF\FD\1f \ff\fa\1f\ff\f0
* Chat system
*/
// ESC x
void CMUSHclientDoc::Phase_ESC (const unsigned char c)
{
if (c == '[')
{
m_phase = DOING_CODE;
m_code = 0;
}
else
m_phase = NONE;
} // end of Phase_ESC
// ANSI - We have ESC [ x
void CMUSHclientDoc::Phase_ANSI (const unsigned char c)
{
if (isdigit (c))
{
m_code *= 10;
m_code += c - '0';
}
else if (c == 'm')
{
if (m_phase != DOING_CODE)
Interpret256ANSIcode (m_code);
else
InterpretANSIcode (m_code);
m_phase = NONE;
}
else if (c == ';')
{
if (m_phase != DOING_CODE)
Interpret256ANSIcode (m_code);
else
InterpretANSIcode (m_code);
m_code = 0;
}
else if (c == 'z') // MXP line security mode
{
if (m_code == eMXP_reset)
MXP_Off ();
else
{
// TRACE1 ("\nMXP security mode now %i\n", m_code);
MXP_mode_change (m_code);
}
m_phase = NONE;
}
else
m_phase = NONE;
} // end of Phase_ANSI
// IAC - we have IAC x
void CMUSHclientDoc::Handle_IAC_GA ()
{
SendToAllPluginCallbacks (ON_PLUGIN_IAC_GA);
} // end of CMUSHclientDoc::Handle_IAC_GA
void CMUSHclientDoc::Phase_IAC (unsigned char & c)
{
char * p;
unsigned char new_c = 0; // returning zero stops further processing of c
switch (c)
{
case EOR :
m_phase = NONE;
p = "EOR";
if (m_bConvertGAtoNewline)
new_c = '\n';
m_last_line_with_IAC_GA = m_total_lines;
Handle_IAC_GA ();
break;
case GO_AHEAD :
m_phase = NONE;
p = "GA";
if (m_bConvertGAtoNewline)
new_c = '\n';
m_last_line_with_IAC_GA = m_total_lines;
Handle_IAC_GA ();
break;
case SE : m_phase = NONE; p = "SE"; break;
case NOP : m_phase = NONE; p = "NOP"; break;
case DATA_MARK : m_phase = NONE; p = "DM"; break;
case BREAK : m_phase = NONE; p = "BRK"; break;
case INTERRUPT_PROCESS : m_phase = NONE; p = "IP"; break;
case ABORT_OUTPUT : m_phase = NONE; p = "AO"; break;
case ARE_YOU_THERE : m_phase = NONE; p = "AYT"; break;
case ERASE_CHARACTER : m_phase = NONE; p = "EC"; break;
case ERASE_LINE : m_phase = NONE; p = "EL"; break;
case SB : m_phase = HAVE_SB; p = "SB"; break;
case WILL : m_phase = HAVE_WILL; p = "WILL"; break;
case WONT : m_phase = HAVE_WONT; p = "WONT"; break;
case DO : m_phase = HAVE_DO; p = "DO"; break;
case DONT : m_phase = HAVE_DONT; p = "DONT"; break;
default : m_phase = NONE; p = "none"; break;
} // end of switch
TRACE1 ("<%s>", p);
m_subnegotiation_type = 0; // no subnegotiation type yet
c = new_c;
} // end of Phase_IAC
// send to all plugins: function OnPluginTelnetRequest (num, type)
// eg. num = 200, type = DO
// They reply true or false to handle or not handle that telnet type
bool CMUSHclientDoc::Handle_Telnet_Request (const int iNumber, const string sType)
{
return SendToAllPluginCallbacks (ON_PLUGIN_TELNET_REQUEST,
iNumber,
sType,
true, // stop on true response
false);
} // end of CMUSHclientDoc::Handle_Telnet_Request
void CMUSHclientDoc::Send_IAC_DO (const unsigned char c)
{
// if we are already in a mode do not agree again - see RFC 854
// and forum subject 3061
if (m_bClient_sent_IAC_DO [c])
return;
unsigned char do_do_it [3] = { IAC, DO, c };
TRACE1 ("\nSending IAC DO <%d>\n", c);
SendPacket (do_do_it, sizeof do_do_it);
m_bClient_sent_IAC_DO [c] = true;
m_bClient_sent_IAC_DONT [c] = false;
} // end of CMUSHclientDoc::Send_IAC_DO
void CMUSHclientDoc::Send_IAC_DONT (const unsigned char c)
{
// if we are already in a mode do not agree again - see RFC 854
// and forum subject 3061
if (m_bClient_sent_IAC_DONT [c])
return;
unsigned char dont_do_it [3] = { IAC, DONT, c };
TRACE1 ("\nSending IAC DONT <%d>\n", c);
SendPacket (dont_do_it, sizeof dont_do_it);
m_bClient_sent_IAC_DONT [c] = true;
m_bClient_sent_IAC_DO [c] = false;
} // end of CMUSHclientDoc::Send_IAC_DONT
void CMUSHclientDoc::Send_IAC_WILL (const unsigned char c)
{
// if we are already in a mode do not agree again - see RFC 854
// and forum subject 3061
if (m_bClient_sent_IAC_WILL [c])
return;
unsigned char will_do_it [3] = { IAC, WILL, c };
TRACE1 ("\nSending IAC WILL <%d>\n", c);
SendPacket (will_do_it, sizeof will_do_it);
m_bClient_sent_IAC_WILL [c] = true;
m_bClient_sent_IAC_WONT [c] = false;
} // end of CMUSHclientDoc::Send_IAC_WILL
void CMUSHclientDoc::Send_IAC_WONT (const unsigned char c)
{
// if we are already in a mode do not agree again - see RFC 854
// and forum subject 3061
if (m_bClient_sent_IAC_WONT [c])
return;
unsigned char wont_do_it [3] = { IAC, WONT, c };
TRACE1 ("\nSending IAC WONT <%d>\n", c);
SendPacket (wont_do_it, sizeof wont_do_it);
m_bClient_sent_IAC_WONT [c] = true;
m_bClient_sent_IAC_WILL [c] = false;
} // end of CMUSHclientDoc::Send_IAC_WONT
// WILL - we have IAC WILL x - reply DO or DONT (generally based on client option settings)
// for unknown types we query plugins: function OnPluginTelnetRequest (num, type)
// eg. num = 200, type = WILL
// They reply true or false to handle or not handle that telnet type
void CMUSHclientDoc::Phase_WILL (const unsigned char c)
{
// telnet negotiation : in response to WILL, we say DONT
// (except for compression, MXP, TERMINAL_TYPE and SGA), we *will* handle that)
TRACE1 ("<%d>", c);
m_phase = NONE; // back to normal text after this character
m_nCount_IAC_WILL++;
m_bClient_got_IAC_WILL [c] = true;
switch (c)
{
case TELOPT_COMPRESS2:
case TELOPT_COMPRESS:
// initialise compression library if not already decompressing
if (!m_bCompressInitOK && !m_bCompress)
m_bCompressInitOK = InitZlib (m_zCompress);
if (m_bCompressInitOK && !m_bDisableCompression)
{
if (!m_CompressOutput)
m_CompressOutput = (Bytef *) malloc (m_nCompressionOutputBufferSize);
if (!m_CompressInput)
m_CompressInput = (Bytef *) malloc (COMPRESS_BUFFER_LENGTH);
if (m_CompressOutput && !m_CompressInput)
{
free (m_CompressOutput); // only got one? may as well free it
m_CompressOutput = NULL;
}
if (m_CompressOutput && m_CompressInput && // we got memory - we can do it
!(c == TELOPT_COMPRESS && m_bSupports_MCCP_2)) // don't agree to MCCP1 and MCCP2
{
Send_IAC_DO (c);
if (c == TELOPT_COMPRESS2)
m_bSupports_MCCP_2 = true;
}
else
{ // not enough memory or already agreed to MCCP 2 - no compression
Send_IAC_DONT (c);
}
} // end of compression wanted and zlib engine initialised
else
{
Send_IAC_DONT (c);
}
break; // end of TELOPT_COMPRESS
// here for SGA (Suppress GoAhead)
case SGA:
Send_IAC_DO (c);
break; // end of SGA
// here for TELOPT_MUD_SPECIFIC
case TELOPT_MUD_SPECIFIC:
Send_IAC_DO (c);
break; // end of TELOPT_MUD_SPECIFIC
case TELOPT_ECHO:
if (!m_bNoEchoOff)
{
m_bNoEcho = true;
TRACE ("Echo turned off\n");
}
break; // end of TELOPT_ECHO
case TELOPT_MXP:
if (m_iUseMXP == eNoMXP)
{
Send_IAC_DONT (c);
} // end of no MXP wanted
else
{
Send_IAC_DO (c);
if (m_iUseMXP == eQueryMXP) // turn MXP on now
MXP_On ();
} // end of MXP wanted
break; // end of MXP
// here for EOR (End of record)
case WILL_END_OF_RECORD:
if (m_bConvertGAtoNewline)
Send_IAC_DO (c);
else
Send_IAC_DONT (c);
break; // end of WILL_END_OF_RECORD
default:
if (Handle_Telnet_Request (c, "WILL"))
{
Send_IAC_DO (c);
Handle_Telnet_Request (c, "SENT_DO");
}
else
Send_IAC_DONT (c);
break; // end of others
} // end of switch
} // end of Phase_WILL
// Received: IAC WONT x
void CMUSHclientDoc::Phase_WONT (const unsigned char c)
{
// telnet negotiation : in response to WONT, we say DONT
TRACE1 ("<%d>", c);
m_phase = NONE;
m_nCount_IAC_WONT++;
m_bClient_got_IAC_WONT [c] = true;
switch (c)
{
case TELOPT_ECHO:
if (!m_bNoEchoOff)
{
m_bNoEcho = false;
TRACE ("Echo turned on\n");
}
break; // end of TELOPT_ECHO
default:
Send_IAC_DONT (c);
break;
} // end of switch
} // end of Phase_WONT
// Received: IAC DO x
// for unknown types we query plugins: function OnPluginTelnetRequest (num, type)
// eg. num = 200, type = DO
// They reply true or false to handle or not handle that telnet type
void CMUSHclientDoc::Phase_DO (const unsigned char c)
{
// telnet negotiation : in response to DO, we say WILL for:
// <102> (Aardwolf), SGA, echo, NAWS, CHARSET, MXP and Terminal type
// for others we query plugins to see if they want to handle it or not
TRACE1 ("<%d>", c);
m_phase = NONE;
m_nCount_IAC_DO++;
m_bClient_got_IAC_DO [c] = true;
switch (c)
{
case SGA:
case TELOPT_MUD_SPECIFIC:
case TELOPT_TERMINAL_TYPE:
case TELOPT_ECHO:
case TELOPT_CHARSET:
Send_IAC_WILL (c);
break; // end of things we will do
case TELOPT_NAWS:
// option off - must be server initiated
if (!m_bNAWS)
Send_IAC_WILL (c);
m_bNAWS_wanted = true;
SendWindowSizes (m_nWrapColumn);
break;
case TELOPT_MXP:
if (m_iUseMXP == eNoMXP)
Send_IAC_WONT (c);
else
{
Send_IAC_WILL (c);
if (m_iUseMXP == eQueryMXP) // turn MXP on now
MXP_On ();
} // end of MXP wanted
break; // end of MXP
default:
if (Handle_Telnet_Request (c, "DO"))
{
Send_IAC_WILL (c);
Handle_Telnet_Request (c, "SENT_WILL");
}
else
Send_IAC_WONT (c);
break; // end of others
} // end of switch
} // end of Phase_DO
// Received: IAC DONT x
void CMUSHclientDoc::Phase_DONT (const unsigned char c)
{
// telnet negotiation : in response to DONT, we say WONT
TRACE1 ("<%d>", c);
m_phase = NONE;
Send_IAC_WONT (c);
m_nCount_IAC_DONT++;
m_bClient_got_IAC_DONT [c] = true;
switch (c)
{
case TELOPT_MXP:
if (m_bMXP)
MXP_Off (true);
break; // end of MXP
} // end of switch
} // end of Phase_DONT
// SUBNEGOTIATION - we have IAC SB c
// remember c (the type) and start collecting the data, as in:
// IAC SB c <data> IAC SE
void CMUSHclientDoc::Phase_SB (const unsigned char c)
{
TRACE1 ("<%d>", c);
// note IAC SB COMPRESS is a special case because they forgot to specify
// the IAC SE, and thus we can't use normal negotiation
if (c == TELOPT_COMPRESS)
m_phase = HAVE_COMPRESS;
else
{
m_subnegotiation_type = c;
m_IAC_subnegotiation_data.erase ();
m_phase = HAVE_SUBNEGOTIATION;
}
} // end of CMUSHclientDoc::Phase_SB
// SUBNEGOTIATION - we have IAC SB c (data)
// if we get an IAC remember it, because it may or may not be followed by IAC or SE
void CMUSHclientDoc::Phase_SUBNEGOTIATION (const unsigned char c)
{
if (c == IAC)
{
// have IAC SB x <data> IAC
// we may or may not have another IAC or possibly an SE
m_phase = HAVE_SUBNEGOTIATION_IAC;
}
else
// just collect the data until IAC SE
m_IAC_subnegotiation_data += c;
} // end of Phase_SUBNEGOTIATION
// SUBNEGOTIATION - we have IAC SB x (data) IAC c
// if the c after IAC is IAC then that becomes a single IAC (which we store now)
// otherwise it should be SE, and we assume it is, otherwise we have an invalid sequence
void CMUSHclientDoc::Phase_SUBNEGOTIATION_IAC (const unsigned char c)
{
if (c == IAC)
{
// have IAC SB x <data> IAC IAC
// store the single IAC
m_IAC_subnegotiation_data += c;
// press on with subnegotiation
m_phase = HAVE_SUBNEGOTIATION;
return;
}
// see: http://www.gammon.com.au/forum/?id=10043
// we have to assume that anything other than IAC is a SE, because
// the spec is silent on what to do otherwise
if (c == SE) // end of subnegotiation
TRACE ("<SE>");
else
TRACE1 ("<%d> (invalid)", c);
m_phase = NONE; // negotiation is over, next byte is plain text
m_nCount_IAC_SB++;
// subnegotiation is complete ...
// we have IAC SB <m_subnegotiation_type> <m_IAC_subnegotiation_data> IAC SE
switch (m_subnegotiation_type)
{
case TELOPT_COMPRESS2:
Handle_TELOPT_COMPRESS2 ();
break;
case TELOPT_MXP:
Handle_TELOPT_MXP ();
break;
case TELOPT_TERMINAL_TYPE:
Handle_TELOPT_TERMINAL_TYPE ();
break;
case TELOPT_CHARSET:
Handle_TELOPT_CHARSET ();
break;
case TELOPT_MUD_SPECIFIC:
Handle_TELOPT_MUD_SPECIFIC ();
// NOTE: no break, fall through and also do the default
default:
{
SendToAllPluginCallbacks (ON_PLUGIN_TELNET_SUBNEGOTIATION,
m_subnegotiation_type,
m_IAC_subnegotiation_data,
false,
false);
}
break; // end of default
} // end of switch
} // end of CMUSHclientDoc::Phase_SUBNEGOTIATION_IAC
// turn MCCP v2 on
void CMUSHclientDoc::Handle_TELOPT_COMPRESS2 ()
{
CString strMessage;
m_iMCCP_type = 2;
// initialise compression library if not already done
if (!m_bCompressInitOK && !m_bCompress)
m_bCompressInitOK = InitZlib (m_zCompress);
if (!(m_bCompressInitOK && m_CompressOutput && m_CompressInput))
strMessage = Translate ("Cannot process compressed output. World closed.");
else
{
int izError = inflateReset (&m_zCompress);
if (izError == Z_OK)
{
m_bCompress = true;
TRACE ("Compression on\n");
return;
}
if (m_zCompress.msg)
strMessage = TFormat ("Could not reset zlib decompression engine: %s",
m_zCompress.msg);
else
strMessage = TFormat ("Could not reset zlib decompression engine: %i",
izError);
}
OnConnectionDisconnect (); // close the world
UMessageBox (strMessage, MB_ICONEXCLAMATION);
} // end of CMUSHclientDoc::Handle_TELOPT_COMPRESS2
// turn MXP on, if required on subnegotiation
void CMUSHclientDoc::Handle_TELOPT_MXP ()
{
if (m_iUseMXP == eOnCommandMXP) // if wanted now
MXP_On ();
} // end of CMUSHclientDoc::Handle_TELOPT_MXP ()
// IAC SB CHARSET REQUEST DELIMITER <name> DELIMITER
/*
Server sends: IAC DO CHARSET
Client sends: IAC WILL CHARSET
Server sends: IAC SB CHARSET REQUEST DELIM NAME IAC SE
Client sends: IAC SB CHARSET ACCEPTED NAME IAC SE
or
Client sends: IAC SB CHARSET REJECTED IAC SE
where:
CHARSET: 0x2A
REQUEST: 0x01
ACCEPTED:0x02
REJECTED:0x03
DELIM: some character that does not appear in the charset name, other than IAC, eg. comma, space
NAME: the character string "UTF-8" (or some other name like "S-JIS")
*/
void CMUSHclientDoc::Handle_TELOPT_CHARSET ()
{
// must have at least REQUEST DELIM NAME [ DELIM NAME2 ...]
if (m_IAC_subnegotiation_data.size () < 3)
return;
int tt = m_IAC_subnegotiation_data [0];
if (tt != 1)
return; // not a REQUEST
string delim = m_IAC_subnegotiation_data.substr (1, 1);
vector <string> v;
StringToVector (m_IAC_subnegotiation_data.substr (2), v, delim, false);
bool found = false;
CString strCharset = "US-ASCII"; // default
if (m_font)
{
// hack! ugh.
if (m_bUTF_8)
strCharset = "UTF-8";
for (vector<string>::const_iterator i = v.begin (); i != v.end (); i++)
if (i->c_str () == strCharset)
{
found = true;
unsigned char p1 [] = { IAC, SB, TELOPT_CHARSET, 2 }; // 2 = accepted
unsigned char p2 [] = { IAC, SE };
unsigned char sResponse [40];
int iLength = 0;
// build up response, eg. IAC, SB, TELOPT_CHARSET, 2, "UTF-8", IAC, SE
// preamble
memcpy (sResponse, p1, sizeof p1);
iLength += sizeof p1;
// ensure max of 20 so we don't overflow the field
CString strTemp = strCharset.Left (20);
memcpy (&sResponse [iLength], strTemp, strTemp.GetLength ());
iLength += strTemp.GetLength ();
// postamble
memcpy (&sResponse [iLength], p2, sizeof p2);
iLength += sizeof p2;
SendPacket (sResponse, iLength);
}
} // end of having an output font
if (!found)
{
unsigned char p [] = { IAC, SB, TELOPT_CHARSET, 3, IAC, SE }; // 3 = rejected
SendPacket (p, sizeof p);
} // end of charset not in use
} // end of CMUSHclientDoc::Handle_TELOPT_CHARSET ()
// stuff for Aardwolf (telopt 102) - call specific plugin handler: OnPluginTelnetOption
void CMUSHclientDoc::Handle_TELOPT_MUD_SPECIFIC ()
{
CString strReceived (m_IAC_subnegotiation_data.c_str ());
SendToAllPluginCallbacks (ON_PLUGIN_TELNET_OPTION, strReceived);
} // end of CMUSHclientDoc::Handle_TELOPT_MUD_SPECIFIC ()
// terminal type request
void CMUSHclientDoc::Handle_TELOPT_TERMINAL_TYPE ()
{
int tt = m_IAC_subnegotiation_data [0];
if (tt != 1)
return; // not a SEND
TRACE ("<SEND>");
// we reply: IAC SB TERMINAL-TYPE IS ... IAC SE
// see: RFC 930 and RFC 1060
unsigned char p1 [] = { IAC, SB, TELOPT_TERMINAL_TYPE, 0 };
unsigned char p2 [] = { IAC, SE };
unsigned char sResponse [40];
int iLength = 0;
// build up response, eg. IAC, SB, TELOPT_TERMINAL_TYPE, 0, "MUSHCLIENT", IAC, SE
// preamble
memcpy (sResponse, p1, sizeof p1);
iLength += sizeof p1;
// ensure max of 20 so we don't overflow the field
CString strTemp = m_strTerminalIdentification.Left (20);
memcpy (&sResponse [iLength], strTemp, strTemp.GetLength ());
iLength += strTemp.GetLength ();
// postamble
memcpy (&sResponse [iLength], p2, sizeof p2);
iLength += sizeof p2;
SendPacket (sResponse, iLength);
} // end of CMUSHclientDoc::Handle_TELOPT_TERMINAL_TYPE ()
// COMPRESSION - we have IAC SB COMPRESS x
void CMUSHclientDoc::Phase_COMPRESS (const unsigned char c)
{
if (c == WILL) // should get COMPRESS WILL
{
TRACE ("<WILL>");
m_phase = HAVE_COMPRESS_WILL;
}
else
{
m_phase = NONE; // error
TRACE1 ("<%d>", c);
}
}
// COMPRESSION - we have IAC SB COMPRESS IAC/WILL x (MCCP v1)
// we will return one of:
// 0 - error in starting compression - close world and display strMessage
// 1 - got IAC or unexpected input, do nothing
// 2 - compression OK - prepare for it
void CMUSHclientDoc::Phase_COMPRESS_WILL (const unsigned char c)
{
if (c == SE) // end of subnegotiation
{
TRACE ("<SE>");
CString strMessage;
m_iMCCP_type = 1;
// initialise compression library if not already done
if (!m_bCompressInitOK && !m_bCompress)
m_bCompressInitOK = InitZlib (m_zCompress);
if (!(m_bCompressInitOK && m_CompressOutput && m_CompressInput))
strMessage = Translate ("Cannot process compressed output. World closed.");
else
{
int izError = inflateReset (&m_zCompress);
if (izError == Z_OK)
{
m_bCompress = true;
TRACE ("Compression on\n");
return;
}
if (m_zCompress.msg)
strMessage = TFormat ("Could not reset zlib decompression engine: %s",
m_zCompress.msg);
else
strMessage = TFormat ("Could not reset zlib decompression engine: %i",
izError);
}
OnConnectionDisconnect (); // close the world
UMessageBox (strMessage, MB_ICONEXCLAMATION);
} // end of IAC SB COMPRESS WILL/IAC SE
// not SE? error
TRACE1 ("<%d>", c);
m_phase = NONE;
} // end of Phase_COMPRESS_WILL