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#!/usr/bin/env bash
set -euo pipefail
info() { printf '\033[1;34m==>\033[0m %s\n' "$*"; }
warn() { printf '\033[1;33m==> warning:\033[0m %s\n' "$*" >&2; }
error() { printf '\033[1;31m==> error:\033[0m %s\n' "$*" >&2; }
die() { error "$*"; exit 1; }
CONFIG_DIR="$HOME/.cache/usque"
CONFIG="$CONFIG_DIR/config.json"
RUNTIME_DIR="${XDG_RUNTIME_DIR:-/tmp}"
PID_FILE="$RUNTIME_DIR/usque-warp.pid"
STATE_FILE="$RUNTIME_DIR/usque-warp.state"
IFACE_FILE="$RUNTIME_DIR/usque-warp.iface"
LOG_FILE="$RUNTIME_DIR/usque-warp.log"
list_tun_ifaces() {
ip -o link show 2>/dev/null | awk -F': ' '{print $2}' | grep -E '^tun[0-9]+$' || true
}
detect_iface() {
if [[ -f "$IFACE_FILE" ]]; then
cat "$IFACE_FILE"
return
fi
list_tun_ifaces | head -n1
}
is_running() {
[[ -f "$PID_FILE" ]] || return 1
local pid
pid=$(cat "$PID_FILE" 2>/dev/null || true)
[[ -n "$pid" ]] || return 1
sudo kill -0 "$pid" 2>/dev/null
}
ensure_config() {
info "Creating $CONFIG_DIR..."
mkdir -p "$CONFIG_DIR"
info "Registering Cloudflare WARP account..."
usque -c "$CONFIG" register < <(yes)
if [[ ! -f "$CONFIG" ]]; then
die "Failed to create config file: $CONFIG"
fi
info "Config created successfully."
}
remove_tun_default_routes() {
local dev="$1"
while ip route show | grep -qE "^default .*dev $dev"; do
ROUTE=$(ip route show | grep -E "^default .*dev $dev" | head -n1)
info "Removing route: $ROUTE"
sudo ip route del "$ROUTE" || break
done
}
connect() {
sudo -v
ensure_config
if [[ -f "$PID_FILE" ]]; then
OLD_PID=$(cat "$PID_FILE")
if sudo kill -0 "$OLD_PID" 2>/dev/null; then
die "usque-warp is already running (PID $OLD_PID)"
else
info "Removing stale PID file..."
rm -f "$PID_FILE"
fi
fi
info "Saving current default route..."
DEFAULT_ROUTE=$(ip route show default | grep -vE 'dev tun[0-9]+' | head -n1)
if [[ -z "$DEFAULT_ROUTE" ]]; then
die "Could not determine current default route"
fi
echo "$DEFAULT_ROUTE" > "$STATE_FILE"
info "Recording pre-existing tun interfaces..."
BEFORE_IFACES=$(list_tun_ifaces)
info "Starting usque..."
# sudo does not affect redirects — the outer shell would open "$LOG_FILE"
# as the unprivileged user. Run the redirection inside sudo (via sh) so the
# log is opened as root. $$ inside sh is usque's PID (sh exec's usque, keeping
# the PID stable regardless of how sudo forks internally), written up front.
sudo sh -c 'echo $$ > "$1"; exec usque nativetun -c "$2" > "$3" 2>&1' \
_ "$PID_FILE" "$CONFIG" "$LOG_FILE" &
info "Waiting for MASQUE connection..."
MASQUE_IP=""
for _ in {1..30}; do
MASQUE_IP=$(grep -oP 'MASQUE connection to \K[0-9.]+(?=:443)' "$LOG_FILE" 2>/dev/null || true)
if [[ -n "$MASQUE_IP" ]]; then
break
fi
sleep 1
done
if [[ -z "$MASQUE_IP" ]]; then
error "Failed to detect MASQUE endpoint"
sudo kill "$(cat "$PID_FILE")" 2>/dev/null || true
rm -f "$PID_FILE"
exit 1
fi
info "Waiting for usque interface..."
TUN_DEV=""
for _ in {1..30}; do
AFTER_IFACES=$(list_tun_ifaces)
TUN_DEV=$(comm -13 <(echo "$BEFORE_IFACES" | sort) <(echo "$AFTER_IFACES" | sort) | head -n1)
[[ -n "$TUN_DEV" ]] && break
sleep 1
done
if [[ -z "$TUN_DEV" ]]; then
error "Failed to detect usque interface"
sudo kill "$(cat "$PID_FILE")" 2>/dev/null || true
rm -f "$PID_FILE"
exit 1
fi
echo "$TUN_DEV" > "$IFACE_FILE"
info "Detected interface: $TUN_DEV"
GATEWAY=$(echo "$DEFAULT_ROUTE" | awk '{for(i=1;i<=NF;i++) if($i=="via") print $(i+1)}')
INTERFACE=$(echo "$DEFAULT_ROUTE" | awk '{for(i=1;i<=NF;i++) if($i=="dev") print $(i+1)}')
if [[ -z "$GATEWAY" || -z "$INTERFACE" ]]; then
die "Cannot determine gateway/interface"
fi
echo "MASQUE_IP=$MASQUE_IP GATEWAY=$GATEWAY INTERFACE=$INTERFACE" >> "$STATE_FILE"
info "Allowing MASQUE endpoint outside tunnel..."
sudo ip route replace \
"$MASQUE_IP" \
via "$GATEWAY" \
dev "$INTERFACE"
info "Removing old tun routes..."
remove_tun_default_routes "$TUN_DEV"
info "Switching default route to $TUN_DEV..."
sudo ip route add default dev "$TUN_DEV" metric 1
info "Connected."
}
disconnect() {
sudo -v
info "Disconnecting..."
local dev
if [[ -f "$IFACE_FILE" ]]; then
dev=$(cat "$IFACE_FILE")
else
dev=$(list_tun_ifaces | head -n1)
fi
# Kill usque FIRST so the kernel tears down tun0 (and every route
# bound to it) as a single atomic operation, instead of us racing
# it by pulling routes out from under a device that's still up.
if [[ -f "$PID_FILE" ]]; then
PID=$(cat "$PID_FILE")
if sudo kill -0 "$PID" 2>/dev/null; then
info "Stopping usque..."
sudo kill "$PID" 2>/dev/null || true
for _ in {1..25}; do
sudo kill -0 "$PID" 2>/dev/null || break
sleep 0.2
done
if sudo kill -0 "$PID" 2>/dev/null; then
warn "usque did not stop on SIGTERM, forcing kill..."
sudo kill -9 "$PID" 2>/dev/null || true
fi
fi
rm -f "$PID_FILE"
fi
# Give the kernel a moment to tear the tunnel device down; only touch
# routes manually if it is not disappearing on its own.
if [[ -n "${dev:-}" ]]; then
info "Waiting for tunnel interface to go down..."
for _ in {1..25}; do
list_tun_ifaces | grep -qx "$dev" || break
sleep 0.2
done
if list_tun_ifaces | grep -qx "$dev"; then
warn "interface $dev is still up, cleaning its routes manually..."
sudo ip route flush dev "$dev" 2>/dev/null || true
remove_tun_default_routes "$dev"
fi
fi
if [[ -f "$STATE_FILE" ]]; then
MASQUE_IP=$(grep -oP 'MASQUE_IP=\K[0-9.]+' "$STATE_FILE" || true)
if [[ -n "$MASQUE_IP" ]]; then
info "Removing MASQUE route: $MASQUE_IP"
sudo ip route del "$MASQUE_IP" 2>/dev/null || true
fi
# Explicitly restore the pre-connect default route rather than
# assuming it's still intact. 'replace' is idempotent.
ORIGINAL_DEFAULT=$(head -n1 "$STATE_FILE")
if [[ "$ORIGINAL_DEFAULT" == default* ]]; then
info "Restoring original default route..."
sudo ip route replace "$ORIGINAL_DEFAULT" \
|| warn "could not restore original default route"
fi
rm -f "$STATE_FILE"
fi
rm -f "$IFACE_FILE"
info "Disconnected."
}
status() {
local iface running=false
iface=$(detect_iface)
is_running && running=true
if [[ -n "$iface" && "$running" == true ]]; then
printf '{"text":"%s","tooltip":"WARP connected via %s","class":"connected"}\n' "$iface" "$iface"
elif [[ -n "$iface" ]]; then
printf '{"text":"%s","tooltip":"Interface %s up, but usque-warp process not tracked","class":"connected"}\n' "$iface" "$iface"
elif [[ "$running" == true ]]; then
printf '{"text":"connecting","tooltip":"usque starting...","class":"connecting"}\n'
else
printf '{"text":"","tooltip":"WARP disconnected","class":"disconnected"}\n'
fi
}
case "${1:-}" in
connect)
connect
;;
disconnect)
disconnect
;;
status)
status
;;
*)
echo "Usage: $0 <connect|disconnect|status>"
echo ""
echo "Commands:"
echo " connect Start the WARP tunnel"
echo " disconnect Stop the WARP tunnel and restore routes"
echo " status Print Waybar status JSON"
exit 1
;;
esac
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