[ILUG] finding user name from inside a C program
manning at cs.ucc.ie
Tue Sep 20 13:23:21 IST 2005
Does anyone know how to safely and easily determine the user name
of someone running a C program?
I tried doing:
getenv( "USER" )
and this works, but it can easily be tricked by a malicious user
simply setting USER=someone-else before running the program.
The "whoami" command seems to be independent of any tampering
with the USER environment variable, but doing:
system( "whoami" )
will output the user name, rather than returning it. (Yes, it's
possible to send its output to a file, and then read in that file,
but this is an awful hack, there must be a neater solution).
Thanks! -- Joseph
Joseph Manning / Computer Science / UCC Cork Ireland / manning at cs.ucc.ie
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