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163 lines
4.1 KiB
163 lines
4.1 KiB
#!/bin/bash
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# ---------------------------------------------------------------------------
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# rssh - route ssh through a series of hosts
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License at <http://www.gnu.org/licenses/> for
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# more details.
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# Usage: rssh [-h|--help]
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# Revision history:
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# 2015-11-11 Created (v0.1)
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# 2016-01-16 Modified license and uploaded to git for someone else to use. (v0.2)
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# ---------------------------------------------------------------------------
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PROGNAME=${0##*/}
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VERSION="0.2"
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clean_up() { # Perform pre-exit housekeeping
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rm -f $conffile
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return
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}
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error_exit() {
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echo -e "${PROGNAME}: ${1:-"Unknown Error"}" >&2
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clean_up
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exit 1
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}
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graceful_exit() {
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clean_up
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exit
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}
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signal_exit() { # Handle trapped signals
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case $1 in
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INT)
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error_exit "Program interrupted by user" ;;
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TERM)
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echo -e "\n$PROGNAME: Program terminated" >&2
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graceful_exit ;;
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*)
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error_exit "$PROGNAME: Terminating on unknown signal" ;;
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esac
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}
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usage() {
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echo -e "Usage: $PROGNAME [-h|--help] [-v] [-s socks_port] sever1 server2 [server3] [server4 ....etc] [-c command]"
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}
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help_message() {
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cat <<- _EOF_
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$PROGNAME ver. $VERSION
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route ssh through a series of hosts
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$(usage)
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Options:
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-h, --help Display this help message and exit.
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-v verbose output from ssh
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-d debug on
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-D debug off
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-s nnnn socks port
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-c command command to run on remote server
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note: This script assumes that any hosts in your ~/.ssh/config file have a non-indented Host
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line and the rest of the items related to that host are indented.
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_EOF_
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return
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}
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# Trap signals
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trap "signal_exit TERM" TERM HUP
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trap "signal_exit INT" INT
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# define variables
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hops=0
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declare -a host
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declare -a hostdata
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declare -a hostname
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declare -a port
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declare -a options
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conffile=$(mktemp)
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opt=""
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# Parse command-line
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while [[ -n $1 ]]; do
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case $1 in
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-h | --help)
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help_message; graceful_exit ;;
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-v)
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opt="-v" ;;
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-c | --command)
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shift;command=$(echo $1) ;;
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-d | --debug)
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set -x ;;
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-s | --socks)
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shift;socks=$(echo $1) ;;
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-D | --debug_off)
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set +x ;;
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-* | --*)
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usage
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error_exit "Unknown option $1" ;;
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*)
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((hops++));
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host[${hops}]=$1;
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hostdata[${hops}]=$(sed -n "/Host.*${1}/,/^[ ]*$/p" ~/.ssh/config);
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hostname[${hops}]=$(echo "${hostdata[${hops}]}" | grep -i "Hostname" | awk '{print $2}' );
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x=${hostname[${hops}]:=${1}};
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port[${hops}]=$(echo "${hostdata[${hops}]}" | grep -i "^[ ]*port" | awk '{print $2}' );
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if [[ ${1} == *":"* ]]; then
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hostname[${hops}]=$(echo $1 | awk -F: '{print $1}')
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port[${hops}]=$(echo $1 | awk -F: '{print $2}')
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fi
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x=${port[${hops}]:=22};
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options[${hops}]=$(echo "${hostdata[${hops}]}" | grep -iv "^[ ]*host" | grep -iv "^[ ]*port" | grep -iv "^[ ]*#"| grep -iv "^[ ]*DynamicForward");
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esac
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shift
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done
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if [ $hops -lt 1 ]; then
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help_message
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graceful_exit
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fi
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# Main logic
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i=${hops}
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while [ $i -gt 1 ]; do
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echo "Host ${host[${i}]}" >> $conffile
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echo " Port ${port[${i}]}" >> $conffile
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echo "${options[${i}]}" >> $conffile
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if [ ! -z "$socks" ] && [ $i -eq ${hops} ] ; then
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echo " DynamicForward localhost:${socks}" >> $conffile
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fi
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echo " ProxyCommand ssh -F ${conffile} ${opt} ${host[${i}-1]} -W ${hostname[${i}]}:${port[${i}]}" >> $conffile
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echo " " >> $conffile
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let i=i-1
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done
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echo "Host ${host[${i}]}" >> $conffile
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echo " Hostname ${hostname[${i}]}" >> $conffile
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echo " Port ${port[${i}]}" >> $conffile
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echo "${options[${i}]}" >> $conffile
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echo " " >> $conffile
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sed -n "/^Host \*$/,/^$/p" ~/.ssh/config >> $conffile
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if [ "$opt" == "-v" ]; then
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cat $conffile
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fi
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ssh ${opt} -F $conffile ${host[${hops}]} "$command"
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graceful_exit
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