61 lines
1.2 KiB
Bash
61 lines
1.2 KiB
Bash
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#!/bin/bash
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readonly PROGRAM_NAME=$(basename $0)
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readonly PROGRAM_LOC=$(readlink -m $(dirname $0))
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readonly ARGS="$@"
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usage() {
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echo usage: $PROGRAM_NAME LOCAL_PORT REMOTE_PORT REMOTE_HOST
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exit 1
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}
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create_tunnel() {
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local readonly local_port=$1; shift
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local readonly remote_port=$1; shift
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local readonly remote_host=$1; shift
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ssh -f -N $remote_host -R $remote_port":localhost:"$local_port
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}
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tunnel_not_present() {
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local readonly remote_port=$1; shift
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ps ax \
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| grep ssh \
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| grep $remote_port \
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| grep -v grep >> /dev/null
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[[ $? -ne 0 ]]
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}
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maintain_tunnel() {
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local readonly local_port=$1; shift
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local readonly remote_port=$1; shift
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local readonly remote_host=$1; shift
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if tunnel_not_present $remote_port; then
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create_tunnel $local_port $remote_port $remote_host
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fi
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}
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is_empty() {
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local readonly string=$1; shift
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[[ -z "$string" ]]
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}
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main() {
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local readonly local_port=$1; shift
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local readonly remote_port=$1; shift
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local readonly remote_host=$1; shift
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if is_empty $local_port || is_empty $remote_port || is_empty $remote_host
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then
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usage
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fi
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maintain_tunnel $local_port $remote_port $remote_host
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}
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main
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