Create a pseudo TTY for the AX25 Network.

AX25Network.h

@@ -19,7 +19,7 @@
 #ifndef	AX25Network_H
 #define	AX25Network_H
 
-#include "SerialController.h"
+#include "PseudoTTYController.h"
 
 #include <cstdint>
 #include <string>
@@ -42,7 +42,7 @@ public:
 	void close();
 
 private:
-	CSerialController m_serial;
+	CPseudoTTYController m_serial;
 	unsigned char*       m_txData;
 	unsigned char*       m_rxData;
 	unsigned int         m_rxLength;

MMDVMHost.vcxproj

@@ -227,6 +227,7 @@
     <ClInclude Include="POCSAGControl.h" />
     <ClInclude Include="POCSAGDefines.h" />
     <ClInclude Include="POCSAGNetwork.h" />
+    <ClInclude Include="PseudoTTYController.h" />
     <ClInclude Include="QR1676.h" />
     <ClInclude Include="RemoteControl.h" />
     <ClInclude Include="RingBuffer.h" />
@@ -326,6 +327,7 @@
     <ClCompile Include="P25Utils.cpp" />
     <ClCompile Include="POCSAGControl.cpp" />
     <ClCompile Include="POCSAGNetwork.cpp" />
+    <ClCompile Include="PseudoTTYController.cpp" />
     <ClCompile Include="QR1676.cpp" />
     <ClCompile Include="RemoteControl.cpp" />
     <ClCompile Include="RS129.cpp" />

MMDVMHost.vcxproj.filters

@@ -320,6 +320,9 @@
     <ClInclude Include="IIRDirectForm1Filter.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="PseudoTTYController.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="BPTC19696.cpp">
@@ -601,5 +604,8 @@
     <ClCompile Include="IIRDirectForm1Filter.cpp">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="PseudoTTYController.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
 </Project>

Makefile

@@ -12,7 +12,7 @@ OBJECTS = AX25Control.o AX25Network.o \
 		DStarSlowData.o FMControl.o FMNetwork.o Golay2087.o Golay24128.o Hamming.o I2CController.o IIRDirectForm1Filter.o LCDproc.o Log.o MMDVMHost.o MobileGPS.o Modem.o \
 		ModemSerialPort.o Mutex.o NetworkInfo.o Nextion.o NullDisplay.o NullModem.o NXDNAudio.o NXDNControl.o NXDNConvolution.o NXDNCRC.o NXDNFACCH1.o NXDNIcomNetwork.o \
 		NXDNKenwoodNetwork.o NXDNLayer3.o NXDNLICH.o NXDNLookup.o NXDNNetwork.o NXDNSACCH.o NXDNUDCH.o P25Audio.o P25Control.o P25Data.o P25LowSpeedData.o P25Network.o \
-		P25NID.o P25Trellis.o P25Utils.o POCSAGControl.o POCSAGNetwork.o QR1676.o RemoteControl.o RS129.o RS241213.o RSSIInterpolator.o SerialController.o SerialPort.o \
+		P25NID.o P25Trellis.o P25Utils.o PseudoTTYController.o POCSAGControl.o POCSAGNetwork.o QR1676.o RemoteControl.o RS129.o RS241213.o RSSIInterpolator.o SerialController.o SerialPort.o \
 		SHA256.o StopWatch.o Sync.o TFTSerial.o TFTSurenoo.o Thread.o Timer.o UDPSocket.o UMP.o UserDB.o UserDBentry.o Utils.o YSFControl.o YSFConvolution.o \
 		YSFFICH.o YSFNetwork.o YSFPayload.o
 

PseudoTTYController.cpp

@@ -0,0 +1,161 @@
+/*
+ *   Copyright (C) 2002-2004,2007-2011,2013,2014-2017,2019,2020 by Jonathan Naylor G4KLX
+ *   Copyright (C) 1999-2001 by Thomas Sailor HB9JNX
+ *
+ *   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
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#if !defined(_WIN32) && !defined(_WIN64)
+
+#include "SerialController.h"
+#include "Log.h"
+
+#include <cstring>
+#include <cassert>
+#include <cstdlib>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <cerrno>
+#include <fcntl.h>
+#include <unistd.h>
+#include <termios.h>
+
+
+CPseudoTTYController::CPseudoTTYController(const std::string& device, unsigned int speed, bool assertRTS) :
+CSerialController(device, speed, assertRTS)
+{
+}
+
+CPseudoTTYController::~CPseudoTTYController()
+{
+}
+
+bool CPseudoTTYController::open()
+{
+	assert(m_fd == -1);
+
+	m_fd = ::posix_openpt(O_RDWR | O_NOCTTY | O_NDELAY);
+	if (m_fd < 0) {
+		LogError("Cannot open device - %s", m_device.c_str());
+		return false;
+	}
+
+	std::string slave = std::string(::ptsname(m_fd));
+
+	// Remove any previous stale symlink
+	::unlink(m_device.c_str());
+
+	int ret = ::symlink(slave.c_str(), m_device.c_str());
+	if (ret != 0) {
+		LogError("Cannot make symlink to %s with %s", slave.c_str(), m_device.c_str());
+		close();
+		return false;
+	}
+
+	m_device = std::string(::ttyname(m_fd));
+
+	if (::isatty(m_fd)) {
+		termios termios;
+		if (::tcgetattr(m_fd, &termios) < 0) {
+			LogError("Cannot get the attributes for %s", m_device.c_str());
+			::close(m_fd);
+			return false;
+		}
+
+		termios.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK);
+		termios.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL);
+		termios.c_iflag &= ~(IXON | IXOFF | IXANY);
+		termios.c_oflag &= ~(OPOST);
+		termios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CRTSCTS);
+		termios.c_cflag |= (CS8 | CLOCAL | CREAD);
+		termios.c_lflag &= ~(ISIG | ICANON | IEXTEN);
+		termios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
+		termios.c_cc[VMIN] = 0;
+		termios.c_cc[VTIME] = 10;
+
+		switch (m_speed) {
+		case 1200U:
+			::cfsetospeed(&termios, B1200);
+			::cfsetispeed(&termios, B1200);
+			break;
+		case 2400U:
+			::cfsetospeed(&termios, B2400);
+			::cfsetispeed(&termios, B2400);
+			break;
+		case 4800U:
+			::cfsetospeed(&termios, B4800);
+			::cfsetispeed(&termios, B4800);
+			break;
+		case 9600U:
+			::cfsetospeed(&termios, B9600);
+			::cfsetispeed(&termios, B9600);
+			break;
+		case 19200U:
+			::cfsetospeed(&termios, B19200);
+			::cfsetispeed(&termios, B19200);
+			break;
+		case 38400U:
+			::cfsetospeed(&termios, B38400);
+			::cfsetispeed(&termios, B38400);
+			break;
+		case 115200U:
+			::cfsetospeed(&termios, B115200);
+			::cfsetispeed(&termios, B115200);
+			break;
+		case 230400U:
+			::cfsetospeed(&termios, B230400);
+			::cfsetispeed(&termios, B230400);
+			break;
+		case 460800U:
+			::cfsetospeed(&termios, B460800);
+			::cfsetispeed(&termios, B460800);
+			break;
+		default:
+			LogError("Unsupported serial port speed - %u", m_speed);
+			::close(m_fd);
+			return false;
+		}
+
+		if (::tcsetattr(m_fd, TCSANOW, &termios) < 0) {
+			LogError("Cannot set the attributes for %s", m_device.c_str());
+			::close(m_fd);
+			return false;
+		}
+
+		if (m_assertRTS) {
+			unsigned int y;
+			if (::ioctl(m_fd, TIOCMGET, &y) < 0) {
+				LogError("Cannot get the control attributes for %s", m_device.c_str());
+				::close(m_fd);
+				return false;
+			}
+
+			y |= TIOCM_RTS;
+
+			if (::ioctl(m_fd, TIOCMSET, &y) < 0) {
+				LogError("Cannot set the control attributes for %s", m_device.c_str());
+				::close(m_fd);
+				return false;
+			}
+		}
+	}
+
+	return true;
+}
+
+#endif
+

PseudoTTYController.h

@@ -0,0 +1,40 @@
+/*
+ *   Copyright (C) 2020 by Jonathan Naylor G4KLX
+ *
+ *   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
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef PseudoTTYController_H
+#define PseudoTTYController_H
+
+#if !defined(_WIN32) && !defined(_WIN64)
+
+#include <cstring>
+
+#include "SerialController.h"
+
+class CPseudoTTYController : public CSerialController {
+public:
+	CPseudoTTYController(const std::string& device, unsigned int speed, bool assertRTS = false);
+	virtual ~CPseudoTTYController();
+
+	virtual bool open();
+
+protected:
+};
+
+#endif
+
+#endif