I don't know C very much, I've only read part of a book a year and a half ago, but still I am trying to understand the source code of the “cracksome” file of the the Morris worm, which you can find here (It's a .txt
file so no it won't run on the computer) : http://www.foo.be/docs-free/morris-worm/worm/cracksome.c.txt
I think it is relevant for you to know that this worm was made in 1988, so it's not recent. I wish to know what some kind of function called
is. I'll start by that.
In the source code, I sometimes see this XS function, I guess it has something to do with the characters included in a file, but I can't then understand the meaning of
in lines like this one :
hosteq = fopen(XS("/etc/hosts.equiv"), XS("r"));
This line and the following ones aim to search for hostnames in the "/etc/hosts.equiv" file inside the infected host. “hosteq” is defined as
. It must be some kind of pointer to a file.
Sometimes I see
but I can't figure this out either...
is an array of 15 characters inside a structure called “usr” and is defined as
seems to be a pointer to the structure usr
That's all folks! Can you help me? I'd appreciate it a lot. :-)