Created
September 23, 2024 09:00
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| #!/usr/bin/env bash | |
| # Usage: nohup bash -c "cd /home/fatesaikou/testSH && ./selfCheckSwitchableSshTunnel.sh localhost 2223 localhost 2222 sshproxy fws.csie.io 22" 1>>/home/fatesaikou/testSH/selfCheckSwitchableSshTunnel.log 2>&1 & | |
| REVERSE_REMOTE_HOST=$1 | |
| REVERSE_REMOTE_PORT=$2 | |
| REVERSE_LOCAL_HOST=$3 | |
| REVERSE_LOCAL_PORT=$4 | |
| USER=$5 | |
| HOST=$6 | |
| PORT=$7 | |
| test_reverse_sshtunnel() { | |
| reversePortTestCmd=""" | |
| set +m; | |
| (sleep 1 && killall -9 nc) & disown; | |
| nc ${REVERSE_REMOTE_HOST} ${REVERSE_REMOTE_PORT}; | |
| echo -n; | |
| set -m; | |
| """ | |
| reversePortTestCmdWithSsh=""" | |
| ssh -o StrictHostKeyChecking=no \ | |
| -o UserKnownHostsFile=/dev/null \ | |
| -o ConnectTimeout=5 \ | |
| -p ${PORT} \ | |
| ${USER}@${HOST} | |
| """ | |
| retStr=$($reversePortTestCmdWithSsh "$reversePortTestCmd" 2>/dev/null) | |
| #if SSH in retStr return true | |
| if [[ $retStr == *SSH* ]]; then | |
| echo "true" | |
| else | |
| echo "false" | |
| fi | |
| } | |
| # initialize variables | |
| SSH_CONTROL_PATH="/tmp/ssh_control_${REVERSE_REMOTE_HOST}:${REVERSE_REMOTE_PORT}:${REVERSE_LOCAL_HOST}:${REVERSE_LOCAL_PORT}_%h_%p_%r" | |
| CURRENT_IP_FOR_TARGETHOST=$(dig +short $HOST @1.1.1.1) | |
| PREV_IP_FOR_TARGETHOST=$CURRENT_IP_FOR_TARGETHOST | |
| SSH_CONTROL_REAL_PATH=$(echo "$SSH_CONTROL_PATH" | sed -e "s/%h/$CURRENT_IP_FOR_TARGETHOST/g" -e "s/%p/$PORT/g" -e "s/%r/$USER/g") | |
| # cleanup old control socket | |
| if [ -e "$SSH_CONTROL_REAL_PATH" ]; then | |
| ssh -o ControlPath=$SSH_CONTROL_PATH -O exit ${USER}@${CURRENT_IP_FOR_TARGETHOST} | |
| rm -f "$SSH_CONTROL_REAL_PATH" | |
| fi | |
| # initialize connection | |
| sshProxyOptions=""" | |
| -o ControlMaster=yes \ | |
| -o ControlPath=${SSH_CONTROL_PATH} \ | |
| -NfR "${REVERSE_REMOTE_HOST}:${REVERSE_REMOTE_PORT}:${REVERSE_LOCAL_HOST}:${REVERSE_LOCAL_PORT}" \ | |
| -o StrictHostKeyChecking=no \ | |
| -o UserKnownHostsFile=/dev/null \ | |
| -o ConnectTimeout=5 | |
| """ | |
| ssh $sshProxyOptions -p ${PORT} ${USER}@${CURRENT_IP_FOR_TARGETHOST} | |
| while true; do | |
| CURRENT_IP_FOR_TARGETHOST=$(dig +short $HOST @1.1.1.1) | |
| # Reconnect if IP has changed or ssh connection is broken | |
| if [[ $(test_reverse_sshtunnel) == "false" || "$PREV_IP_FOR_TARGETHOST" != "$CURRENT_IP_FOR_TARGETHOST" ]]; then | |
| echo "Connection to $HOST:$PORT is broken or IP has changed from $PREV_IP_FOR_TARGETHOST to $CURRENT_IP_FOR_TARGETHOST, Reconnecting..." | |
| ssh -o ControlPath=$SSH_CONTROL_PATH -O exit ${USER}@${CURRENT_IP_FOR_TARGETHOST} | |
| SSH_CONTROL_REAL_PATH=$(echo "$SSH_CONTROL_PATH" | sed -e "s/%h/$CURRENT_IP_FOR_TARGETHOST/g" -e "s/%p/$PORT/g" -e "s/%r/$USER/g") | |
| rm -f "$SSH_CONTROL_REAL_PATH" | |
| ssh $sshProxyOptions -p ${PORT} ${USER}@${CURRENT_IP_FOR_TARGETHOST} | |
| PREV_IP_FOR_TARGETHOST=$CURRENT_IP_FOR_TARGETHOST | |
| fi | |
| sleep 5 | |
| done |
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