Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
A shell script which executes rcon commands
#!/bin/bash
SERVER='localhost'
PORT='26000'
PASSWORD='foo'
SECURE=0
SECURE_PORT="1234"
RCON_HEADER=$(echo -e "\xff\xff\xff\xff")
ESCAPE_CHAR=$(echo -en "\x1b")
# Send raw rcon command
# $1 nc parameters Server Port
# $2... Raw rcon message
# stdout Raw reply from the rcon server
function rcon_send_raw()
{
echo -n "$RCON_HEADER${@:2}" | nc -u -w 1 $1
}
# Send raw rcon command
# $1 Server
# $2 Port
# $3 Password
# $4 Secure protocol
# $5... Rcon command
# stdout Reply from the rcon server
function rcon_send()
{
local SERVER=$1
local PORT=$2
local PASSWORD=$3
local COMMAND=${@:5}
case $4 in
0)
rcon_send_raw "$SERVER $PORT" rcon $PASSWORD $COMMAND | rcon_strip_header n | rcon_recolor
;;
1)
local time=$(printf "%ld.%06d" $(date +%s) $RANDOM)
local hash=$(rcon_hash $PASSWORD "$time $COMMAND")
rcon_send_raw "$SERVER $PORT" "srcon HMAC-MD4 TIME $hash $time $COMMAND" | rcon_strip_header n | rcon_recolor
;;
2)
local challenge=$(rcon_send_raw "-p $SECURE_PORT $SERVER $PORT" getchallenge) # | rcon_strip_header "challenge " )
challenge=$(echo -n $challenge | rcon_strip_header "challenge " | head -c 11)
local hash=$(rcon_hash $PASSWORD "$challenge $COMMAND")
rcon_send_raw "-p $SECURE_PORT $SERVER $PORT" "srcon HMAC-MD4 CHALLENGE $hash $challenge $COMMAND" | rcon_strip_header n | rcon_recolor
;;
*)
echo 1>&2 Unsupported protocol
return 1
;;
esac
}
# Create MD4 HMAC
# $1 Password
# $2... Data
# stdout Binary hash
function rcon_hash()
{
echo -n ${@:2} | openssl dgst -md4 -hmac $1 -binary
}
# Remove the header from rcon packets
# $* additional strings to be removed
# stdin -> stdout
function rcon_strip_header()
{
sed -r "s/^$RCON_HEADER$*//"
}
# Remove rcon colors
# Single-digit colors are converted to ANSI colors, complex colors are stripped
# stdin -> stdout
function rcon_recolor()
{
sed -r \
-e "s/^|([^^])\^0/\\1${ESCAPE_CHAR}[0m/g" \
-e "s/^|([^^])\^([1-47])/\\1${ESCAPE_CHAR}[1;3\\2m/g" \
-e "s/^|([^^])\^5/\\1${ESCAPE_CHAR}[1;36m/g" \
-e "s/^|([^^])\^6/\\1${ESCAPE_CHAR}[1;35m/g" \
-e "s/^|([^^])\^[89]/\\1${ESCAPE_CHAR}[1;37m/g" \
-e "s/^|([^^])\^x[[:xdigit:]]{3}/\\1${ESCAPE_CHAR}[0m/g" \
-e "s/\^\^/^/g" \
echo -en "${ESCAPE_CHAR}[0m"
}
function show_help()
{
echo -e "\e[1mNAME\e[0m"
echo -e "\t$0 - Send a single rcon command"
echo
echo -e "\e[1mSYNOPSIS\e[0m"
echo -e "\t\e[1m$0\e[0m [\e[4moptions\e[0m...] [\e[1m-c \e[4;22mcommand\e[0m...]"
echo -e "\t\e[1m$0\e[0m \e[1mhelp\e[0m|\e[1m-h\e[0m|\e[1m--help\e[0m"
echo
echo -e "\e[1mOPTIONS\e[0m"
echo -e "\e[1m-host=\e[22;4mserver\e[0m[\e[1m:\e[22;4mport\e[0m]"
echo -e "\tSet rcon server (and port). Default: \e[1m$SERVER\e[0m"
echo -e "\e[1m-p\e[22;4mport\e[0m|\e[1m-P\e[22;4mport\e[0m|\e[1m-port=\e[22;4mport\e[0m"
echo -e "\tSet rcon server port. Default: \e[1m$PORT\e[0m"
echo -e "\e[1m-secure=\e[22;4msecure\e[0m|\e[1m-s=\e[22;4msecure\e[0m"
echo -e "\tSet rcon secure protocol. Default: \e[1m$SECURE\e[0m"
echo -e "\e[1m-secure-port=\e[22;4mport\e[0m|\e[1m-sp=\e[22;4mport\e[0m"
echo -e "\tSet port to use in the multiple messages required by secure 2. Default: \e[1m$SECURE_PORT\e[0m"
echo -e "\e[1m-c\e[0m|\e[1m--\e[0m"
echo -e "\tFollowing this parameter the rest of the command line is interpreted as rcon commands.\e[0m"
echo
echo -e "\e[1mNOTES\e[0m"
echo -e " * Unrecognized paramters are interpreted as rcon commands"
echo -e " * If no rcon commands are passed, it will read them from standard input"
echo -e " * A single call to $0 results in a single rcon command being executed"
echo -e " * If the command produces some output, it is shown on standard output"
echo
}
cat_command=false
rcon_command=""
for arg in $@
do
if $cat_command
then
rcon_command="$rcon_command $arg"
else
case $arg in
help|--help|-h)
show_help
exit 0
;;
-password=*|-passwd=*|-pw=*)
PASSWORD=${arg#*=}
;;
-host=*:*)
SERVER=${arg#*=}
SERVER=${SERVER%:*}
PORT=${arg#*:}
;;
-host=*)
SERVER=${arg#*=}
;;
-p*)
PORT=${arg#-p}
;;
-P*)
PORT=${arg#-P}
;;
-port=*)
PORT=${arg#*=}
;;
-secure=*|-s=*)
SECURE=${arg#*=}
;;
-secure-port=*|-sp=*)
SECURE_PORT=${arg#*=}
;;
-c|--)
cat_command=true
;;
*)
rcon_command="$rcon_command $arg"
;;
esac
fi
done
if [ -z "$rcon_command" ]
then
rcon_command=$(cat)
fi
rcon_command=${rcon_command# }
rcon_send $SERVER $PORT $PASSWORD $SECURE "$rcon_command"
@GoZippy

This comment has been minimized.

Copy link

@GoZippy GoZippy commented Jun 14, 2017

Any comments on the fork and differences?

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.