It tries to read another line and hits EOF. Something like sscanf(line, 'LicenseKey=%s', licenseKey). Presumably, it's extracting the license key you entered, aoeklycf, and saving it in a variable for later comparison against the expected license key. strncmp('LicenseKey=', 'LicenseKey=aoeklycf', 11) = 0ĭoes the line start with LicenseKey=? Yes, it does. It reads another line: LicenseKey=aoeklycf. We know that 0x7ffe72450860 is the current line, so it's presumably pulling out the e-mail address from the current line.

Unfortunately, ltrace has not dereferenced any of the addresses to show us the contents. strncmp('LicenseHolder=', 14) = 0ĭoes the line start with LicenseHolder=? Yes, it does. Reads a line from the file: strncmp('LicenseKey=', 11) = 3ĭoes the line start with LicenseKey=? The return value of 3 means no, it does not. Let's look at the library trace call by call. So I guess the answer lies somewhere within the memfrob and strncmp function at the end. Strncmp('LicenseKey=', 'LicenseKey=aoeklycf', 11) = 0

The task says we should use 'strace' and 'ltrace' to solve this problem. The only thing i'm looking for now is the correct license key. ini that includes a license-holder and a license key. So what I've already done is creating this missing license file. We have to 'crack' a program, which is missing a license file that is required to start the program. I'm trying to solve this exercise for university.

Filemagic license key