Testing Turn servers

turn.sh

#!/bin/bash

function install_prerequisites() {
  if ! command -v turnutils_uclient > /dev/null || ! command -v curl > /dev/null || ! command -v certbot > /dev/null; then
      echo "Installing necessary dependencies..."
      sudo apt-get remove --purge -y needrestart
      sudo apt-get install -y gcc coturn openssl libcurl4-openssl-dev
      sudo snap install core
      sudo snap refresh core
      sudo snap install --classic certbot
      sudo ln -s /snap/bin/certbot /usr/bin/certbot
  fi
}

function generate_certificate() {
  REGISTRATION_EMAIL=$1
  DOMAIN=$2

  certbot_response=$(sudo certbot certonly -v --nginx --non-interactive --agree-tos -m $REGISTRATION_EMAIL -d $DOMAIN)
  echo "certbot response - $certbot_response"
}

function start_turn_server() {
  TURN_REALM=$1
  DOMAIN=$2
  STATIC_AUTH_SECRET=$3
  CLI_PASSWORD=$4
  LISTENING_PORT=$5
  TLS_LISTENING_PORT=$6
  PUBLIC_IP=$(curl -s ifconfig.me)
  
  # https://manpages.debian.org/testing/coturn/turnserver.1.en.html
  sudo turnserver -n -v -o -a -p $LISTENING_PORT --no-cli --tls-listening-port $TLS_LISTENING_PORT -r $TURN_REALM -X $PUBLIC_IP --cert /etc/letsencrypt/live/$DOMAIN/fullchain.pem --pkey /etc/letsencrypt/live/$DOMAIN/privkey.pem  --use-auth-secret --static-auth-secret $STATIC_AUTH_SECRET --cli-password=$CLI_PASSWORD
} 

function validate_turn_server() {
    TURN_SERVER=$1
    TURN_PORT=$2
    TURN_USERNAME=$3
    TURN_PASSWORD=$4
    TURN_REALM=$5

    echo "Testing connection to TURN server..."
    echo "QUIT" | telnet "$TURN_SERVER" "$TURN_PORT" 2>/dev/null | grep "Connected to" > /dev/null
    if [[ $? -eq 0 ]]; then
        echo "Connection to TURN server successful."
    else
        echo "Failed to connect to TURN server. Please check the server address and port."
        exit 1
    fi
    
    echo "Testing authentication with TURN server..."
    echo "AUTH \"$TURN_USERNAME:$TURN_PASSWORD\"" | turnutils_uclient -t "$TURN_SERVER" -p "$TURN_PORT" -u "$TURN_USERNAME" -w "$TURN_PASSWORD" -r "$TURN_REALM" > /dev/null
    if [[ $? -eq 0 ]]; then
        echo "Authentication with TURN server successful."
    else
        echo "Failed to authenticate with TURN server. Please check the username, password, and realm."
        exit 1
    fi
}