cathook-attach


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#!/usr/bin/env bash

line=$(pidof hl2_linux)
arr=($line)
inst=$1

# Make sure only root can run our script
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

if [ $# == 0 ]; then
  inst=0
fi

if [ ${#arr[@]} == 0 ]; then
  echo "TF2 isn't running, launch TF2 and try again."
  exit 1
fi

if [ $inst -gt ${#arr[@]} ] || [ $inst == ${#arr[@]} ]; then
  echo "Wrong index!"
  exit 1
fi

proc=${arr[$inst]}

echo "Running instances: ${arr[*]}"
echo "Attaching to $proc"

if grep -q /usr/lib/cathook.so /proc/"$proc"/maps; then
  echo "Cathook is already loaded!"
  exit 1
fi

echo "loading /usr/lib/libcathook.so to $proc"
input="$(
gdb -n -q -batch \
  -ex "attach $proc" \
  -ex "set \$dlopen = (void*(*)(char*, int)) dlopen" \
  -ex "call \$dlopen(\"/usr/lib/libcathook.so\", 1)" \
  -ex "call dlerror()" \
  -ex 'print (char *) $2' \
  -ex "detach" \
  -ex "quit"
)"

last_line="${input##*$'\n'}"

if [ "$last_line" == "\$3 = 0x0" ]; then
    /bin/echo -e "\e[32mSuccessfully injected cathook!\e[0m"
else
    /bin/echo -e "\e[31mInjection failed...\e[0m"
fi