#!/bin/bash
# dummy.sh
#
# Dummy auth API noise generator
#  Runs indefinitely
#  1) Sends random auth API requests every ~20 mins to simulate OpenVPN key renegotiations
#  2) Sends random OpenVPN session up/down API calls at random intervals to simulate those
# This will probably be extended later to do noise generation for other things too
#

API_URL=$(< /etc/api)
MAX_JOBS=15  # Limit number of concurrent dummy jobs

# Run forever
while true; do
    # ---- AUTH dummy every ~20 mins to simulate real key renegotiations ----
    while [ "$(jobs -r | wc -l)" -ge "$MAX_JOBS" ]; do sleep 1; done
    (
        sleep $((RANDOM % 240 + 960))  # 16 to 20 mins (jittered)
        dummy_hash=$(head -c 64 /dev/urandom | sha512sum | awk '{print $1}')
        curl --http2 --silent --max-time 8 --connect-timeout 8 "https://$API_URL?token=$dummy_hash" >/dev/null 2>&1
    ) &

    # ---- Random session dummy (up/down/auth) ----
    while [ "$(jobs -r | wc -l)" -ge "$MAX_JOBS" ]; do sleep 1; done
    (
        sleep $((RANDOM % 900 + 120))  # 2 to 17 mins
        dummy_hash=$(head -c 64 /dev/urandom | sha512sum | awk '{print $1}')
        case $((RANDOM % 3)) in
            0) dummy_url="https://$API_URL?token=$dummy_hash" ;;
            1) dummy_url="https://$API_URL?token=$dummy_hash&action=up" ;;
            2) dummy_url="https://$API_URL?token=$dummy_hash&action=down" ;;
        esac
        curl --http2 --silent --max-time 8 --connect-timeout 8 "$dummy_url" >/dev/null 2>&1
    ) &

    # ---- Burst mode ----
    # In the real API requests, there's sometimes a spike of users connecting/disconnecting at busy hours.
    # This "burst mode" simulates that.
    if (( RANDOM % 6 == 0 )); then  # ~1 in 6 iterations
        count=$((RANDOM % 4 + 2))   # 2-5 dummies
        for i in $(seq 1 $count); do
            while [ "$(jobs -r | wc -l)" -ge "$MAX_JOBS" ]; do sleep 1; done
            (
                sleep $((RANDOM % 180))  # 0-3 mins
                dummy_hash=$(head -c 64 /dev/urandom | sha512sum | awk '{print $1}')
                case $((RANDOM % 3)) in
                    0) dummy_url="https://$API_URL?token=$dummy_hash" ;;
                    1) dummy_url="https://$API_URL?token=$dummy_hash&action=up" ;;
                    2) dummy_url="https://$API_URL?token=$dummy_hash&action=down" ;;
                esac
                curl --http2 --silent --max-time 8 --connect-timeout 8 "$dummy_url" >/dev/null 2>&1
            ) &
        done
    fi

    # Loop every 2-5 minutes before repeating
    sleep $((RANDOM % 180 + 120))
done