openwrt routing

linux/openwrt/policy-route-starlink.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+# Policy routing: send traffic to specified domains via Starlink interface.
+# Run on Linux host (e.g. Linux Mint) that has both main connection and WiFi to Starlink.
+# Usage: sudo ./policy-route-starlink.sh [setup|remove]
+# Configure STARLINK_IF, STARLINK_GW, DOMAINS below or via env.
+
+set -e
+
+# Starlink WiFi interface (e.g. wlan0)
+STARLINK_IF="${STARLINK_IF:-wlan0}"
+# Starlink gateway IP (get from: ip route show dev "$STARLINK_IF" | head -1)
+STARLINK_GW="${STARLINK_GW:-}"
+# Domains to route via Starlink (space-separated)
+DOMAINS="${DOMAINS:-polymarket.com www.polymarket.com}"
+# Routing table id for Starlink
+TABLE_ID=200
+
+action="${1:-setup}"
+
+resolve_domains() {
+    local list=""
+    for d in $DOMAINS; do
+        local ips
+        ips=$(getent ahosts "$d" 2>/dev/null | awk '$1 !~ /^:/ {print $1}' | sort -u) || true
+        for ip in $ips; do
+            [[ -n "$ip" ]] && list="$list $ip"
+        done
+    done
+    echo "$list"
+}
+
+get_starlink_gw() {
+    if [[ -n "$STARLINK_GW" ]]; then
+        echo "$STARLINK_GW"
+        return
+    fi
+    ip route show dev "$STARLINK_IF" 2>/dev/null | awk '/default via/ {print $3; exit}'
+}
+
+do_setup() {
+    if ! ip link show "$STARLINK_IF" &>/dev/null; then
+        echo "Interface $STARLINK_IF not found. Set STARLINK_IF (e.g. wlan0)."
+        exit 1
+    fi
+    local gw
+    gw=$(get_starlink_gw)
+    if [[ -z "$gw" ]]; then
+        echo "Could not determine Starlink gateway. Set STARLINK_GW or ensure $STARLINK_IF has a route."
+        exit 1
+    fi
+    # Ensure table 200 has default via Starlink (idempotent)
+    ip route replace default via "$gw" dev "$STARLINK_IF" table "$TABLE_ID" 2>/dev/null || true
+    local ips
+    ips=$(resolve_domains)
+    if [[ -z "$ips" ]]; then
+        echo "No IPs resolved for domains: $DOMAINS. Check DNS/connectivity."
+        exit 1
+    fi
+    for ip in $ips; do
+        ip rule add to "$ip" table "$TABLE_ID" 2>/dev/null || true
+    done
+    echo "Routing via Starlink ($STARLINK_IF): $ips"
+}
+
+do_remove() {
+    local ips
+    ips=$(resolve_domains)
+    for ip in $ips; do
+        ip rule del to "$ip" table "$TABLE_ID" 2>/dev/null || true
+    done
+    ip route flush table "$TABLE_ID" 2>/dev/null || true
+    echo "Removed policy rules for table $TABLE_ID."
+}
+
+case "$action" in
+    setup)   do_setup ;;
+    remove) do_remove ;;
+    *)
+        echo "Usage: $0 [setup|remove]"
+        echo "Env: STARLINK_IF ($STARLINK_IF), STARLINK_GW, DOMAINS"
+        exit 1
+        ;;
+esac