Last active
May 16, 2020 07:46
-
-
Save kakash1hatake/75b93be39c432ebf367910a7228cf6d9 to your computer and use it in GitHub Desktop.
get env variable of the particular process using gdb
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/sh | |
# | |
# get env variable of the particular process. It can show variables that were created at runtime. Requires root privileges | |
# usage: sudo penv_runtime.sh pid var_name | |
# | |
pid=$1 | |
var_name=$2 | |
var_value=`gdb -q -batch -ex "attach $pid" -ex 'call (char*) getenv("'$var_name'")' -ex 'detach' | egrep '^\$1 ='` | |
if [ "$var_value" == '$1 = 0x0' ] | |
then | |
# variable empty or does not exist | |
echo -n | |
else | |
# gdb returns $1 = hex_value "string_value" | |
var_hex=`echo "$var_value" | awk '{print $3}'` | |
var_value=`echo "$var_value" | sed -r -e 's/^\$1 = '$var_hex' //;s/^"//;s/"$//'` | |
echo -n "$var_value" | |
fi |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment