Add an implementation of Telnet protocol

src/Protocols/TelnetProtocol.cpp

@@ -0,0 +1,93 @@
+ /*
+ * Copyright 2020, WindTerm.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "TelnetProtocol.h"
+
+#include <iomanip>
+#include <mutex>
+#include <sstream>
+
+const char *arrTelnetCmds[] =
+{
+  "XEOF",  "SUSP",  "ABORT", "EOR",  "SE",
+  "NOP",   "DM",    "BREAK", "IP",   "AO",
+  "AYT",   "EC",    "EL",    "GA",   "SB",
+  "WILL",  "WONT",  "DO",    "DONT", "IAC"
+};
+
+const char *arrTelnetOpts[] =
+{
+	"BINARY", "ECHO", "RCP", "SUPPRESS GO AHEAD", "NAME", "STATUS", "TIMING MARK", "RCTE", 
+	"NAOL", "NAOP", "NAOCRD", "NAOHTS", "NAOHTD", "NAOFFD", "NAOVTS", "NAOVTD", 
+	"NAOLFD", "EXTEND ASCII", "LOGOUT", "BYTE MACRO", "DATA ENTRY TERMINAL", "SUPDUP", "SUPDUP OUTPUT", "SEND LOCATION",
+	"TERMINAL TYPE", "END OF RECORD", "TACACS UID", "OUTPUT MARKING", "TTYLOC", "3270 REGIME", "X.3 PAD", "NAWS",
+	"TSPEED", "LFLOW", "LINEMODE", "XDISPLOC", "OLD ENVIRON", "AUTHENTICATION", "ENCRYPT", "NEW ENVIRON", 
+	"TN3270E", "XAUTH", "CHARSET", "RSP", "COM PORT CONTROL", "SUPPRESS LOCAL ECHO", "START TLS", "KERMIT", 
+	"SEND-URL", "FORWARD_X",
+};
+
+std::string TelnetProtocol::GetCommandName(uchar chTelnetCmd)
+{
+	if (chTelnetCmd >= TELCMD_XEOF && chTelnetCmd <= TELCMD_IAC)
+		return arrTelnetCmds[chTelnetCmd - TELCMD_XEOF];
+
+	std::ostringstream oss;
+	oss << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)chTelnetCmd << "(Unknown Telnet Command)";
+	return oss.str();
+}
+
+std::string TelnetProtocol::GetOptionName(uchar chTelnetOption)
+{
+	if (chTelnetOption >= TELOPT_BINARY && chTelnetOption <= TELOPT_FORWARD_X) { return arrTelnetOpts[chTelnetOption - TELOPT_BINARY];} 
+	else if (chTelnetOption == TELOPT_MCCP1) { return "MUD COMPRESSION PROTOCOL (V1)"; }
+	else if (chTelnetOption == TELOPT_MCCP2) { return "MUD COMPRESSION PROTOCOL (V2)"; }
+	else if (chTelnetOption == TELOPT_MSP) { return "MUD SOUND PROTOCOL"; }
+	else if (chTelnetOption == TELOPT_MXP) { return "MUD EXTENSION PROTOCOL";}
+	else if (chTelnetOption == TELOPT_PRAGMA_LOGON) { return "TELOPT PRAGMA LOGON"; }
+	else if (chTelnetOption == TELOPT_SSPI_LOGON) { return "TELOPT SSPI LOGON"; }
+	else if (chTelnetOption == TELOPT_PRAGMA_HEARTBEAT) { return "TELOPT PRAGMA HEARTBEAT"; }
+	else if (chTelnetOption == TELOPT_EXOPL) { return "EXTENDED OPTIONS LIST"; }
+
+	std::ostringstream oss;
+	oss << "0x" << std::hex << std::setw(2) << std::setfill('0') << (int)chTelnetOption << "(Unknown Telnet Option)";
+	return oss.str();
+}
+
+TelnetOptionVector &TelnetProtocol::GetOptionVector()
+{
+	static TelnetOptionVector m_vTelnetOption;
+	static std::once_flag flag;
+
+	std::call_once(flag, [&]() {
+		m_vTelnetOption.clear();
+		m_vTelnetOption.resize(TELOPT_INDEX_MAX);
+
+		m_vTelnetOption[TELOPT_INDEX_NAWS].Init(TELOPT_NAWS, TELNET_CLIENT, TELOPT_STATE_INACTIVE_REQUESTED);
+		m_vTelnetOption[TELOPT_INDEX_TTYPE].Init(TELOPT_TTYPE, TELNET_CLIENT, TELOPT_STATE_INACTIVE_REQUESTED);
+		m_vTelnetOption[TELOPT_INDEX_ECHO].Init(TELOPT_ECHO, TELNET_SERVER, TELOPT_STATE_INACTIVE_REQUESTED);
+		m_vTelnetOption[TELOPT_INDEX_SERVER_SGA].Init(TELOPT_SGA, TELNET_SERVER, TELOPT_STATE_INACTIVE_REQUESTED);
+		m_vTelnetOption[TELOPT_INDEX_CLIENT_SGA].Init(TELOPT_SGA, TELNET_CLIENT, TELOPT_STATE_INACTIVE_REQUESTED);
+		m_vTelnetOption[TELOPT_INDEX_SERVER_BIN].Init(TELOPT_BINARY, TELNET_SERVER, TELOPT_STATE_INACTIVE);
+		m_vTelnetOption[TELOPT_INDEX_CLIENT_BIN].Init(TELOPT_BINARY, TELNET_CLIENT, TELOPT_STATE_INACTIVE);
+	});
+
+	return m_vTelnetOption;
+}
+
+TelnetProtocol::TelnetProtocol()
+{
+	m_name = "Telnet";
+}