Frank Rolsted Jensen
7f4d2f3a51
ttynvt now uses pseudoterminal (pty) to be able to get use of the tty line disciplines. Currently only the line discipline: TTY and PPP are supported.
68 lines
2.5 KiB
Plaintext
68 lines
2.5 KiB
Plaintext
ttynvt makes a virtual serial device (tty) and connects
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the device to a Network Virtual Terminal (NVT).
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+-ttynvt-+------------------------+
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| | +---------------+ |
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/dev/ttyNVT | pty /dev/ppp pty |
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| | slave | master |
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--------------------------------------------------
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+--FUSE--+ +-tty--ldisc------+ TCP--->host
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1 Build environment
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The gcc compiler is used by default (see Makefile).
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libfuse-dev - Filesystem in Userspace (development) must be installed
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at the build system.
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glibc must support pthreads.
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2 Target
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The linux kernel at the target system must support FUSE (FUSE_FS=y) and
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libpthread and libfuse must be installed in the root filesystem.
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3 Build
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$ autoreconf -vif
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$ ./configure ...
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$ make
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The default target in the Makefile builds the Network Virtual Terminal.
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Output name is: ttynvt.
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4 Run
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The application (ttynvt) installs a virtual serial device in the /dev
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directory (by default: /dev/ttyNVT0).
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The major/minor number of the device, the address (name/IP) and the port
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number of the serial server must be specified when the application
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is started (command-line options).
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E.g.
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./ttynvt -M 199 -m 6 -n ttyNVT0 -s 169.254.1.1:5020
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To get a list of all command-line options:
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./ttynvt --help
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5. Test
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The serial server: ser2net (http://ser2net.sourceforge.net/) might be used
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to test the virtual serial server on the target.
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Install the server (ser2net) and add following line to the configuration
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file (/etc/ser2net.conf):
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5020:telnet:0:/dev/ttyS0:115200 remctl NONE 1STOPBIT 8DATABITS RTSCTS HANGUP_WHEN_DONE
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At the server, plug-in a loopback connector in the serial port (ttyS0).
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At the target, open the virtual serial port, with a termial program,
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e.g minicom:
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minicom -D /dev/ttyNVT0
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6 Diagnostic
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Add the command-line option '-D <level>' to enable logging of diagnostic information.
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The log is forwarded to syslog with the debug level.
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Wireshark is also very useful when debugging the interface between the client
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and the server.
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Ref: RFC-854 - Telnet Protocol Specification
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RFC-2217 - Telnet Com Port Control Option
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