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Thread: airbase-ng segmentation fault

  1. #1
    Senior Member
    Join Date
    Jul 2011
    Posts
    236

    Default airbase-ng segmentation fault

    Ladies & Gents,

    Operating System: Back|Track5 r1
    Box: Toshiba NB255-N250
    Updates: Fully up to date via: apt-get update && apt-get dist-upgrade

    I have recently run into a huge problem. After I had finished my quickset.sh script QuickSet I decided to do a demonstration for some fellow co-workers and ran into an error with the script. To follow along with my steps and what I did please grab a copy. By using the script you will speed up the debugging process since it is all automated, this will hopefully save you time
    Code:
    svn checkout http://quickset.googlecode.com/svn/trunk/ quickset
    I am going to list the steps I have taken and in the order in which I took them. The end state of the problem is a segmentation fault within airbase-ng; I'm listing the steps I took so that you can narrow that out of your solutions if you have one. I am hoping that someone on this forum has the answer. If you respond to this post, I ask that you please post cohesive thoughts so that a solution is announced, not just needless jabber. Thank you for your time.


    1) Airbase-NG is crashing during extended periods of usage. There are a lot of variables to consider with this bug: nmap, ettercap, dhcp3-server, etc...


    2) I first chose to eliminate xterm as a factor by changing the script to the following on the airbase-ng launch line:
    Code:
    airbase-ng -c $sac -e "$SSID" $pii &
    I did this in the hopes that it would yield an error message while still allowing the script to continue; hence the ampersand. I had previously tried a variety of methods to evoke an error message, but was unsuccessful; evidently airbase-ng doesn't like to issue them out with regards to the at0 interface


    3) I waited a little bit for at0 to not exist anymore, and then issued <crtl+c> within the script. The idea worked and I was given the following as output:
    Code:
     ./quickset.sh: line 1:  1866 Segmentation fault      airbase-ng -c $sac -e "$SSID" $pii
    4) I rewrote the airbase-ng and dhcp server part of the script so that i could launch them seperate and cancel DHCP out as a possible error cause. The most recent steps I have taken to narrow down the problem are:
    Code:
     ./quickset.sh
    
    
    # I used the same wireless card for both the internet connected NIC and external.  One might think this would be a problem, but I tried it with different cards and the same end result.  For testing purposes feel free and unhindered to use the same card
    1) Wireless NIC           set to wlan0
    4) Monitor Mode NIC       set to mon0
    I then chose 8 and proceeded.
    
    
    At the main menu I chose: 5) Routing Features
    
    
    At Routing Features I chose: 2) Wireless Vaccuum
    
    
    At Soft AP Parameters: I left everything defaulted except for AutoLaunch of the DHCP server, that I set to: No
    # Setting AutoLaunch to no simply launches the AP and reverts back to the Routing Features menu...
    
    
    At Method Selection I chose: 2) bullzeye--> Responds only to the specified ESSID
    Roughly 3 minutes after creation, the at0 interface dies due to a segmentation fault.

    5) My next step will be to try this on Lucid Lynx since it is roughly the same (Except for the kernel). I hope to be able to try this tonight and report back tommorow.
    V/r,
    Snafu
    Pffbt..[quote]I made a discovery today. I found a computer. Wait a second, this is cool. It does what I want it to. If it makes a mistake, it's because I screwed it up. Not because it doesn't like me... Or feels threatened by me.. Or thinks I'm a smart ass.. [/quote]

  2. #2
    Senior Member
    Join Date
    Jul 2011
    Posts
    236

    Default Re: airbase-ng segmentation fault

    Have not had a chance to check this on lynx just yet, but I am a little disheartened by the lack of response I'm getting here. I'm 100% sure I am not the only person in the whole universe who uses airbase-ng on BT5r1
    V/r,
    Snafu
    Pffbt..[quote]I made a discovery today. I found a computer. Wait a second, this is cool. It does what I want it to. If it makes a mistake, it's because I screwed it up. Not because it doesn't like me... Or feels threatened by me.. Or thinks I'm a smart ass.. [/quote]

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