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Stefan_Klotz_85's avatar
Stefan_Klotz_85
Icon for Cirrus rankCirrus
Jul 14, 2014
Solved

TCP monitor with sending a byte sequence

One of our customers is using a TCP/IP based application and instead of using the default TCP monitor, they will check their application with sending a specific byte sequence after the TCP connect. I...
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  • 0x0ff_info_1420's avatar
    0x0ff_info_1420
    Jul 23, 2014

    Why do you use -l parameter ? It's mean listen so, your commands wait for connexion and send your binary payload.

     

    The nc error message tell you that you can't listen on an interface you don't own. Till now, I didn't know we could specify the address. :p

     

    But what you do there is not what I wanted to explain to you in my first post. I told you (but not clearly, i admit :p) that you could use regular TCP monitor in TMSH or GUI. In the field Send String and in the field Receive String you can actually use the escaped string. ;) More simple than with the nc script no ?

     

0x0ff_info_1420's avatar
0x0ff_info_1420
Icon for Cirrus rankCirrus
Jul 23, 2014

Why do you use -l parameter ? It's mean listen so, your commands wait for connexion and send your binary payload.

 

The nc error message tell you that you can't listen on an interface you don't own. Till now, I didn't know we could specify the address. :p

 

But what you do there is not what I wanted to explain to you in my first post. I told you (but not clearly, i admit :p) that you could use regular TCP monitor in TMSH or GUI. In the field Send String and in the field Receive String you can actually use the escaped string. ;) More simple than with the nc script no ?

 

  • Amit585731's avatar
    Amit585731
    Icon for Nimbostratus rankNimbostratus
    Feb 23, 2015
    Hi, can you please suggest what will be the correct send and monitor string for below requirement: UDP monitor should probe on 2723 and it should contain the string "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" with a hex value of 02 before the string and a hex value of 00 after it. So the full hex string of the data segment would be: 02 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 30 31 32 33 34 35 36 37 38 39 00. The servers will respond with their hostname (e.g., host1 or host2) followed by a pipe character ("|") followed by the string sent ("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789") to indicate success.
  • 0x0ff_info_1420's avatar
    0x0ff_info_1420
    Icon for Cirrus rankCirrus
    Feb 23, 2015
    Your send string should be you hex string escaped (\x02\x41...\x00), and something like "\x68\x6f\x73\x74\x31..." for your received I guess.