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knksmith57/build-socks-proxy

Created February 8, 2017 06:38
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  1. knksmith57 created this gist Feb 8, 2017.
    42 changes: 42 additions & 0 deletions build-socks-proxy
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,42 @@
    #!/usr/bin/env bash -e

    instance_name="throw-away-$(date +%s)"
    region=us-west1-b
    ssh_key_dir="$(mktemp -d)"

    cleanup() {
    echo "removing temp dir: $ssh_key_dir"
    rm -rf "$ssh_key_dir"

    echo "killing instance"
    gcloud compute instances delete --zone us-west1-b --quiet $instance_name
    }
    trap cleanup EXIT

    echo "generating ssh key pair in: $ssh_key_dir"
    ssh-keygen -t rsa -b 4096 -C '' -N '' -f "$ssh_key_dir/id_rsa" &>/dev/null
    pub_key="$(< "$ssh_key_dir/id_rsa.pub")"

    echo "creating instance: $instance_name"
    gcloud compute instances create $instance_name \
    --zone $region \
    --machine-type f1-micro \
    --metadata "ssh-keys=foobar:$pub_key" \
    --maintenance-policy TERMINATE \
    --image debian-8-jessie-v20170124 \
    --image-project debian-cloud \
    --boot-disk-size 10

    echo "discovering instance IP address"
    ip_address="$(\
    gcloud compute instances describe $instance_name \
    --zone $region \
    --format json \
    | jq -r .networkInterfaces[].accessConfigs[].natIP \
    )"

    echo "creating SOCKS5 tunnel from localhost:5555 => $ip_address"
    ssh -D 5555 -C -q -N \
    -i "$ssh_key_dir/id_rsa" \
    -o StrictHostKeyChecking=no \
    foobar@$ip_address