Ubuntu Serial Port Sniffer Linux Os

Currently this plugin is only available on Microsoft Windows and Linux. Unlike many other so-called 'serial monitors' for Linux, which require you to redirect the IO streams of an application you want to monitor, our serial monitor is a true one — it intercepts calls between an application and a serial port driver, thus allowing monitoring the serial IO directly.

This document presents (almost) the minimum amount of work required to enable a serial console login on an Ubuntu 6.06 and later versions. (Minor changes have been added to improve performance.) Both server and client settings are included.

This procedure was developed using the Remote Serial Console HOWTO (see 'External links' below), and adapted to apply specifically to Ubuntu. The reader is referred to this document for any issues arising from using this HOWTO.

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Assumptions

• You have enabled the serial console in your BIOS.¹

• The serial connection is being made at 115200 baud 8n1, on first serial port, called /dev/ttyS0 in linux (9600 8n1 is the default fall back if your hardware does not support 115200 baud)
• You are comfortable editing critical system files such as /etc/inittab, /boot/grub/menu.lst
• You are using a serial (null modem) cable. It is also possible to use a USB to Serial adaptor, but the tty* must be changed to reflect your hardware.
• You have an available serial console on ttyS0. If your not getting any output, a real serial port or other device might be using ttyS0. Try using ttyS1, ttyS2, etc.

If you want to use a standard Ethernet/RJ-45 cable for serial connection you can buy a couple of Serial to Cat 5 adapters or make one yourself.

Server Setup

Configuring the console login process

This section details how to configure the 'getty' process to enable a login via the console port. You need to configure either an Upstart system or the older inittab, depending on Ubuntu version you are using.

Configuring upstart (Karmic and newer)

1) Create a file called /etc/init/ttyS0.conf containing the following:

2) Ask upstart to start the getty

Configuring upstart (Edgy/Feisty/Jaunty)

Create a file called /etc/event.d/ttyS0 containing the following:

Configuring inittab (only Dapper and older !)

1) Edit /etc/inittab

2) Change the following line:

to:

3) Restart init:

At this point, a new login prompt should appear on the output of the serial console.

Configuring grub

This section details how to get grub talking via the serial port.

This section is optional if the user does not want grub interaction via the serial console port.

Configuring (Karmic and newer)

1) Edit /etc/default/grub

2) update grub

update-grub

Configuring grub (Edgy/Feisty/Jaunty)

1) Edit /boot/grub/menu.lst:

2) Add the following lines to the top of the file:

3) When you next reboot, the output from grub will go to the normal console unless input is received from the serial port. Whichever receives input first becomes the default console. This gives you the best of both worlds.

Configuring the kernel boot parameters

This section details how to configure the kernel boot parameters to get boot information through the console port.

This section is optional if the user does not want the kernel boot messages to appear on the serial console port.

The following procedure can be carried out by modifying the 'kernel' line in grub prior to committing the changes directly to the /boot/grub/menu.lst file.

1) Edit /boot/grub/menu.lst:

2) Modify the kernel line for the image you want to boot using the serial console on. In this case, I'm setting up the default 2.6.10-5.386 kernel to use the serial console line. Change:

to:

Note two 'console=' kernel options. You can specify this option several times. All devices, mentioned in it will receive kernel messages (those, generated by printk() and seen by dmesg). However, stdin/stdout/stderr of /sbin/init process will be set to the last device only, therefore only the last device will show startup messages and act as a console in single-user mode.

3) Reboot into this kernel. Output from the boot process should be sent via the serial console line.

Client Setup

1) Ensure you have a read/write permissions on /dev/ttyS0.

if the last command didn't show an output add yourself to dialout group and logout/login:

Alternatively, you can always run minicom through sudo, but it's not recommended.

2) Install minicom

3) Configure minicom.

4) Configure client serial port settings: In Serial port setup, set the following options

4b) Using 7.10 on the server, I needed to set the following on the client:

My 7.10 client and Windows' HyperTerminal both defaulted to Yes; until I changed this client -> server communication did not work.

5) Configure Initialization string: In Modem and dialing clear the init

6) Save setup as dfl

7) You might need to press enter several times to get the connection running.

8) To log on in the future, run

and press enter several times if it does not come up on start up.

Alternative serial client: screen

GNU screen actually makes quite a capable serial terminal.

To install:

To start:

(adjust to requirements)

To end the session, use Ctrl-A,Shift-K.

External links

• Serial Console Howto

• Serial Console

1. This is only needed if you plan to use serial console to enter BIOS configuration utility or observe early startup messages even before GRUB starts. Note, that in some cases it may interfere with GRUB settings described below. If you're sure you've configured GRUB correctly, but the serial menu does not appear, try disabling serial console support in BIOS. (1)

How do I check and configure serial ports under Linux for various purposes such as modem, connecting null modems or connect a dumb terminal?
Linux offers various tools. Linux uses ttySx for a serial port device name. For example, COM1 (DOS/Windows name) is ttyS0, COM2 is ttyS1 and so on.

Task: Display Detected System’s Serial Support

Simple run dmesg command
$ dmesg grep tty
Output:

setserial command

setserial is a program designed to set and/or report the configuration information associated with a serial port. This information includes what I/O port and IRQ a particular serial port is using, and whether or not the break key should be interpreted as the Secure Attention Key, and so on. Just type the following command:
$ setserial -g /dev/ttyS[0123]
Output:

setserial with -g option help to find out what physical serial ports your Linux box has.

Linux serial console programs

Once serial ports identified you can configure Linux box using various utilities:

1. minicom– The best friendly serial communication program for controlling modems and connecting to dump devices
2. wvidial or other GUI dial up networking program – a PPP dialer with built-in intelligence.
3. getty / agetty – agetty opens a tty port, prompts for a login name and invokes the /bin/login command.
4. grub / lilo configuration – To configure serial port as the system console

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