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Old 03-20-2009, 08:57 AM   #1
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exec() echo "password" | cryptsetup


Long story short: I used "cryptsetup luksCreate" to encrypt a harddrive. I forgot my password, so i wrote a bruteforce program in c++ to sort it out for me. I only have my codeline left to go.

If i run this as root:

echo "password" | cryptsetup luksOpen /dev/md1 md1

I will pipe the "password" to cryptsetup. How do i do that in c/c++? I have had a look at the exec() functions but i cant manage to get the work done. i tied this:

execlp("/usr/bin/echo","\"password\""," ", "|", " ", "cryptsetup"," ","luksOpen", " ","/dev/md1"," ","md1",0);

but that just echos the whole line to my screen. Any suggestions?

Best regards
Old 03-20-2009, 09:30 AM   #2
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Originally Posted by shakeshar View Post
Any suggestions?
    FILE *result = popen(echo "password" | cryptsetup luksOpen /dev/md1 md1);
if you need to parse the result, or
    int result = system(echo "password" | cryptsetup luksOpen /dev/md1 md1);
if you just want to know if it succeeded or not. Read the man pages for each before going forward.


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