Update update-port.sh

a change to allow us to keep using port forwarding

openvpn/pia/update-port.sh

@@ -1,9 +1,9 @@
 #!/bin/bash 
-
+#export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin:/root/bin
-echo "Wait for tunnel to be fully initialized and PIA is ready to give us a port"
-sleep 15
-
 # Source our persisted env variables from container startup
+## this is an amalgamation of two scripts to keep my PIA working, credit to the main authors, the original scripts linked in the READ.ME
+#v0.2
+
 . /etc/transmission/environment-variables.sh
 
 # Settings
@@ -14,49 +14,76 @@ transmission_passwd=$(tail -1 ${TRANSMISSION_PASSWD_FILE})
 pia_client_id_file=/etc/transmission/pia_client_id
 transmission_settings_file=${TRANSMISSION_HOME}/settings.json
 
-#
+sleep 5
-# First get a port from PIA
-#
 
-new_client_id() {
+###### PIA Variables ######
-    head -n 100 /dev/urandom | sha256sum | tr -d " -" | tee ${pia_client_id_file}
+curl_max_time=15
+curl_retry=5
+curl_retry_delay=15
+user=$(sed -n 1p /config/openvpn-credentials.txt)
+pass=$(sed -n 2p /config/openvpn-credentials.txt)
+pf_host=$(ip route | head -1 | grep tun | awk '{ print $3 }')
+###### Nextgen PIA port forwarding      ##################
+   
+get_auth_token () {
+            tok=$(curl --insecure --silent --show-error --request POST --max-time $curl_max_time \
+                 --header "Content-Type: application/json" \
+                 --data "{\"username\":\"$user\",\"password\":\"$pass\"}" \
+                "https://www.privateinternetaccess.com/api/client/v2/token" | jq -r '.token')
+            [ $? -ne 0 ] && echo "Failed to acquire new auth token" && exit 1
+            #echo "$tok"
     }
 
-pia_client_id="$(cat ${pia_client_id_file} 2>/dev/null)"
+get_auth_token
-if [[ -z "${pia_client_id}" ]]; then
-   echo "Generating new client id for PIA"
-   pia_client_id=$(new_client_id)
-fi
 
-# Get the port
+yes '' | sed 3q
-port_assignment_url="http://209.222.18.222:2000/?client_id=$pia_client_id"
-pia_response=$(curl -s -f "$port_assignment_url")
-pia_curl_exit_code=$?
 
-if [[ -z "$pia_response" ]]; then
+get_sig () {
-    echo "Port forwarding is already activated on this connection, has expired, or you are not connected to a PIA region that supports port forwarding"
+  pf_getsig=$(curl --insecure --get --silent --show-error \
+    --retry $curl_retry --retry-delay $curl_retry_delay --max-time $curl_max_time \
+    --data-urlencode "token=$tok" \
+    $verify \
+    "https://$pf_host:19999/getSignature")
+  if [ "$(echo $pf_getsig | jq -r .status)" != "OK" ]; then
+    echo "$(date): getSignature error"
+    echo $pf_getsig
+    echo "the has been a fatal_error"
   fi
+  pf_payload=$(echo $pf_getsig | jq -r .payload)
+  pf_getsignature=$(echo $pf_getsig | jq -r .signature)
+  pf_port=$(echo $pf_payload | base64 -d | jq -r .port)
+  pf_token_expiry_raw=$(echo $pf_payload | base64 -d | jq -r .expires_at)
+  if date --help 2>&1 /dev/null | grep -i 'busybox' > /dev/null; then
+    pf_token_expiry=$(date -D %Y-%m-%dT%H:%M:%S --date="$pf_token_expiry_raw" +%s)
+  else
+    pf_token_expiry=$(date --date="$pf_token_expiry_raw" +%s)
+  fi
+}
 
-# Check for curl error (curl will fail on HTTP errors with -f flag)
+bind_port () {
-if [[ ${pia_curl_exit_code} -ne 0 ]]; then
+  pf_bind=$(curl --insecure --get --silent --show-error \
-   echo "curl encountered an error looking up new port: $pia_curl_exit_code"
+      --retry $curl_retry --retry-delay $curl_retry_delay --max-time $curl_max_time \
-   exit
+      --data-urlencode "payload=$pf_payload" \
+      --data-urlencode "signature=$pf_getsignature" \
+      $verify \
+      "https://$pf_host:19999/bindPort")
+  if [ "$(echo $pf_bind | jq -r .status)" = "OK" ]; then
+    echo "the port has been bound to $pf_port  $(date)"		
+  else  
+    echo "$(date): bindPort error"
+    echo $pf_bind
+    echo "the has been a fatal_error"
   fi
+}
 
-# Check for errors in PIA response
+get_sig
-error=$(echo "$pia_response" | grep -oE "\"error\".*\"")
-if [[ ! -z "$error" ]]; then
-   echo "PIA returned an error: $error"
-   exit
-fi
 
-# Get new port, check if empty
+#echo "sig is $pf_getsig"
-new_port=$(echo "$pia_response" | grep -oE "[0-9]+")
+echo "port is $pf_port"
-if [[ -z "$new_port" ]]; then
+
-    echo "Could not find new port from PIA"
+bind_port
-    exit
+#echo "pf bind is $pf_bind"
-fi
+new_port="$pf_port"
-echo "Got new port $new_port from PIA"
 
 #
 # Now, set port in Transmission
@@ -65,6 +92,8 @@ echo "Got new port $new_port from PIA"
 # Check if transmission remote is set up with authentication
 auth_enabled=$(grep 'rpc-authentication-required\"' "$transmission_settings_file" \
                    | grep -oE 'true|false')
+
+
 if [[ "true" = "$auth_enabled" ]]
   then
   echo "transmission auth required"
@@ -103,3 +132,44 @@ if [[ "$new_port" != "$transmission_peer_port" ]]; then
 else
     echo "No action needed, port hasn't changed"
 fi
+
+echo ""
+echo "initial setup complete!"
+echo ""
+echo "waiting for rebind loop................."
+
+echo "token expiry $pf_token_expiry"
+pf_remaining=$((  $pf_token_expiry - $(date +%s) ))
+echo "remaining = $pf_remaining"
+pf_bindinterval=$(( 30 * 60))
+# Get a new token when the current one has less than this remaining
+# Defaults to 7 days (same as desktop app)
+pf_minreuse=$(( 60 * 60 * 24 * 7 ))
+
+pf_remaining=0
+pf_firstrun=1
+vpn_ip=$(ip route | head -1 | grep tun | awk '{ print $3 }')
+pf_host="$vpn_ip"
+
+while true; do
+  pf_remaining=$((  $pf_token_expiry - $(date +%s) ))
+  # Get a new pf token as the previous one will expire soon
+  if [ $pf_remaining -lt $pf_minreuse ]; then
+    if [ $pf_firstrun -ne 1 ]; then
+      echo "$(date): PF token will expire soon. Getting new one."
+    else
+      echo "$(date): Getting PF token"
+      pf_firstrun=0
+    fi
+    get_sig
+    echo "$(date): Obtained PF token. Expires at $pf_token_expiry_raw"
+    bind_port
+    echo "$(date): Server accepted PF bind"
+    echo "$(date): Forwarding on port $pf_port"
+    echo "$(date): Rebind interval: $pf_bindinterval seconds"
+  fi
+  sleep $pf_bindinterval &
+  wait $!
+  
+bind_port  
+done