fix: make ipset optional, fix ExecStartPre, add prerequisites to README

README.md

@@ -35,6 +35,18 @@ chmod +x /usr/local/bin/wg-*.sh /usr/local/bin/wg-policy-ctl
 
 ---
 
+## 📦 Prerequisites
+
+| Package | Required | Install |
+|---------|----------|---------|
+| `jq` | **Yes** | `apt install jq` |
+| `inotify-tools` | **Yes** (for watcher daemon) | `apt install inotify-tools` |
+| `ipset` | Optional | `apt install ipset` |
+
+If `ipset` is not installed, the engine will automatically fall back to per-rule `iptables` whitelist entries. This works fine for small deployments. For large numbers of clients/targets, `ipset` is recommended for O(1) lookup performance.
+
+---
+
 ## ⚙️ Integrasi ke `wg0.conf`
 
 To integrate the engine, you need to append hooks into your `wg0.conf` interface block, and declare the `#Access` tags under each peer.
@@ -49,9 +61,15 @@ ListenPort = 51820
 PrivateKey = <SERVER_PRIVATE_KEY>
 
 # PostUp: sync policy + apply engine
+# default PostUp
+iptables -A FORWARD -i wg0 -j ACCEPT; iptables -A FORWARD -o wg0 -j ACCEPT; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE;
+# modification
 PostUp = /usr/local/bin/wg-sync-policy.sh && /usr/local/bin/wg-policy-engine.sh
 
 # PostDown: safe cleanup
+# default PostUp
+iptables -D FORWARD -i wg0 -j ACCEPT; iptables -D FORWARD -o wg0 -j ACCEPT; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE;
+# modification
 PostDown = /usr/local/bin/wg-policy-cleanup.sh
 ```
 
@@ -117,7 +135,23 @@ wg-policy-ctl validate
 
 If you are using the daemon mode to auto-sync changes instantly upon editing `wg0.conf` (without needing to run `wg-policy-ctl reload` or restarting the interface).
 
-Enable the systemd services:
+### 1. File Installation
+Place the three provided systemd unit files into `/etc/systemd/system/`.
+
+| Systemd File | Location | Description |
+|--------------|----------|-------------|
+| `wg-policy.service` | `/etc/systemd/system/wg-policy.service` | The main daemon that runs `wg-sync-watch.sh` |
+| `wg-policy-health.timer` | `/etc/systemd/system/wg-policy-health.timer` | Triggers the health check every 5 minutes |
+| `wg-policy-health.service`| `/etc/systemd/system/wg-policy-health.service`| Executes the actual health check logic |
+
+```bash
+# Example copy command
+cp wg-policy.service wg-policy-health.timer wg-policy-health.service /etc/systemd/system/
+```
+
+### 2. Enable & Start Services
+After copying the files, reload systemd to recognize them, then enable and start the services.
+
 ```bash
 systemctl daemon-reload
 systemctl enable wg-policy.service

wg-policy-engine.sh

@@ -115,68 +115,94 @@ main() {
     log_info "Chain $CHAIN created and linked to FORWARD"
 
     # === POPULATE IPSET (for large-scale whitelist) ===
-    log_info "Populating ipsets..."
+    local use_ipset=false
+    if has_ipset; then
+        use_ipset=true
+        log_info "Populating ipsets..."
 
-    ensure_ipset "$IPSET_V4" "inet"
+        ensure_ipset "$IPSET_V4" "inet"
-    flush_ipset "$IPSET_V4"
+        flush_ipset "$IPSET_V4"
 
-    # Check if we need IPv6 ipset
+        # Check if we need IPv6 ipset
-    local use_ipv6=false
+        local use_ipv6=false
-    if [[ -n "$WG_SUBNET_V6" ]] && command -v ip6tables &>/dev/null; then
+        if [[ -n "$WG_SUBNET_V6" ]] && command -v ip6tables &>/dev/null; then
-        use_ipv6=true
+            use_ipv6=true
-        ensure_ipset "$IPSET_V6" "inet6"
+            ensure_ipset "$IPSET_V6" "inet6"
-        flush_ipset "$IPSET_V6"
+            flush_ipset "$IPSET_V6"
-    fi
-
-    # Read all access entries and populate ipset
-    jq -r '
-        .clients // {} | to_entries[] |
-        select(.value.access != null and (.value.access | length > 0)) |
-        .key as $ip |
-        .value.access[] |
-        "\($ip) \(.)"
-    ' "$POLICY_FILE" 2>/dev/null | while read -r client_ip target; do
-        [[ -z "$client_ip" || -z "$target" ]] && continue
-
-        # Determine if v4 or v6
-        if [[ "$target" == *":"* ]]; then
-            if [[ "$use_ipv6" == true ]]; then
-                ipset add "$IPSET_V6" "$target" 2>/dev/null || \
-                    log_warn "Failed to add $target to ipset $IPSET_V6"
-            fi
-        else
-            ipset add "$IPSET_V4" "$target" 2>/dev/null || \
-                log_warn "Failed to add $target to ipset $IPSET_V4"
         fi
-    done
 
-    local v4_count v6_count
+        # Read all access entries and populate ipset
-    v4_count=$(ipset list "$IPSET_V4" 2>/dev/null | grep -c '^[0-9]' || echo 0)
+        jq -r '
-    v6_count=$(ipset list "$IPSET_V6" 2>/dev/null | grep -c '^[0-9a-f:]' || echo 0)
+            .clients // {} | to_entries[] |
-    log_info "ipset $IPSET_V4: $v4_count entries, $IPSET_V6: $v6_count entries"
+            select(.value.access != null and (.value.access | length > 0)) |
+            .key as $ip |
+            .value.access[] |
+            "\($ip) \(.)"
+        ' "$POLICY_FILE" 2>/dev/null | while read -r client_ip target; do
+            [[ -z "$client_ip" || -z "$target" ]] && continue
+
+            if [[ "$target" == *":"* ]]; then
+                if [[ "$use_ipv6" == true ]]; then
+                    ipset add "$IPSET_V6" "$target" 2>/dev/null || \
+                        log_warn "Failed to add $target to ipset $IPSET_V6"
+                fi
+            else
+                ipset add "$IPSET_V4" "$target" 2>/dev/null || \
+                    log_warn "Failed to add $target to ipset $IPSET_V4"
+            fi
+        done
+
+        local v4_count v6_count
+        v4_count=$(ipset list "$IPSET_V4" 2>/dev/null | grep -c '^[0-9]' || echo 0)
+        v6_count=$(ipset list "$IPSET_V6" 2>/dev/null | grep -c '^[0-9a-f:]' || echo 0)
+        log_info "ipset $IPSET_V4: $v4_count entries, $IPSET_V6: $v6_count entries"
+    else
+        log_warn "ipset not installed, falling back to per-rule iptables whitelist"
+        local use_ipv6=false
+        if [[ -n "$WG_SUBNET_V6" ]] && command -v ip6tables &>/dev/null; then
+            use_ipv6=true
+        fi
+    fi
 
     # === RULE 1: ESTABLISHED,RELATED — allow return traffic ===
     iptables -A "$CHAIN" -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
 
-    # === RULE 2: WHITELIST via ipset (per-client source) ===
+    # === RULE 2: WHITELIST (per-client source) ===
-    # For each client with access rules, allow only from that client's IP to ipset targets
+    if [[ "$use_ipset" == true ]]; then
-    jq -r '
+        jq -r '
-        .clients // {} | to_entries[] |
+            .clients // {} | to_entries[] |
-        select(.value.access != null and (.value.access | length > 0)) |
+            select(.value.access != null and (.value.access | length > 0)) |
-        "\(.key)"
+            "\(.key)"
-    ' "$POLICY_FILE" 2>/dev/null | while read -r client_ip; do
+        ' "$POLICY_FILE" 2>/dev/null | while read -r client_ip; do
-        [[ -z "$client_ip" ]] && continue
+            [[ -z "$client_ip" ]] && continue
 
-        if [[ "$client_ip" == *":"* ]]; then
+            if [[ "$client_ip" == *":"* ]]; then
-            # IPv6 client
+                if [[ "$use_ipv6" == true ]]; then
-            if [[ "$use_ipv6" == true ]]; then
+                    ip6tables -A "$CHAIN" -s "$client_ip" -m set --match-set "$IPSET_V6" dst -j ACCEPT 2>/dev/null || true
-                ip6tables -A "$CHAIN" -s "$client_ip" -m set --match-set "$IPSET_V6" dst -j ACCEPT 2>/dev/null || true
+                fi
+            else
+                iptables -A "$CHAIN" -s "$client_ip" -m set --match-set "$IPSET_V4" dst -j ACCEPT
             fi
-        else
+        done
-            # IPv4 client
+    else
-            iptables -A "$CHAIN" -s "$client_ip" -m set --match-set "$IPSET_V4" dst -j ACCEPT
+        jq -r '
-        fi
+            .clients // {} | to_entries[] |
-    done
+            select(.value.access != null and (.value.access | length > 0)) |
+            .key as $ip |
+            .value.access[] |
+            "\($ip) \(.)"
+        ' "$POLICY_FILE" 2>/dev/null | while read -r client_ip target; do
+            [[ -z "$client_ip" || -z "$target" ]] && continue
+
+            if [[ "$client_ip" == *":"* ]]; then
+                if [[ "$use_ipv6" == true ]]; then
+                    ip6tables -A "$CHAIN" -s "$client_ip" -d "$target" -j ACCEPT 2>/dev/null || true
+                fi
+            else
+                iptables -A "$CHAIN" -s "$client_ip" -d "$target" -j ACCEPT
+            fi
+        done
+    fi
 
     # === RULE 3: ISOLATION — drop NEW connections between WG clients ===
     if [[ -n "$WG_SUBNET" ]]; then

wg-policy-lib.sh

@@ -129,8 +129,13 @@ validate_cidr() {
 # IPSET MANAGEMENT
 # ============================================================
 
+has_ipset() {
+    command -v ipset &>/dev/null
+}
+
 ensure_ipset() {
     local name="$1" family="$2"
+    has_ipset || return 0
     if ! ipset list "$name" &>/dev/null; then
         ipset create "$name" hash:net family "$family" hashsize 1024 maxelem 65536 timeout 0
         log_info "Created ipset: $name (family=$family)"
@@ -139,6 +144,7 @@ ensure_ipset() {
 
 flush_ipset() {
     local name="$1"
+    has_ipset || return 0
     if ipset list "$name" &>/dev/null; then
         ipset flush "$name"
     fi
@@ -146,6 +152,7 @@ flush_ipset() {
 
 destroy_ipset() {
     local name="$1"
+    has_ipset || return 0
     if ipset list "$name" &>/dev/null; then
         ipset destroy "$name"
     fi

wg-policy.service

@@ -7,7 +7,7 @@ StartLimitBurst=5
 
 [Service]
 Type=simple
-ExecStartPre=/usr/local/bin/wg-policy-engine.sh --health-check
+ExecStartPre=/usr/local/bin/wg-sync-policy.sh
 ExecStart=/usr/local/bin/wg-sync-watch.sh
 ExecStopPost=/usr/local/bin/wg-policy-cleanup.sh
 Restart=always