Add namespace test script

main.go

@@ -167,7 +167,7 @@ func runOlmMainWithArgs(ctx context.Context, args []string) {
 		setupWindowsEventLog()
 	} else {
 		// Initialize logger for non-Windows platforms
-		logger.Init()
+		logger.Init(nil)
 	}
 
 	// Load configuration from file, env vars, and CLI args

namespace.sh

@@ -0,0 +1,126 @@
+#!/bin/bash
+
+# Configuration
+NS_NAME="isolated_ns"       # Name of the namespace
+VETH_HOST="veth_host"       # Interface name on host side
+VETH_NS="veth_ns"           # Interface name inside namespace
+HOST_IP="192.168.15.1"      # Gateway IP for the namespace (host side)
+NS_IP="192.168.15.2"        # IP address for the namespace
+SUBNET_CIDR="24"            # Subnet mask
+DNS_SERVER="8.8.8.8"        # DNS to use inside namespace
+
+# Detect the main physical interface (gateway to internet)
+PHY_IFACE=$(ip route get 8.8.8.8 | awk -- '{printf $5}')
+
+# Helper function to check for root
+check_root() {
+    if [ "$EUID" -ne 0 ]; then
+        echo "Error: This script must be run as root."
+        exit 1
+    fi
+}
+
+setup_ns() {
+    echo "Bringing up namespace '$NS_NAME'..."
+
+    # 1. Create the network namespace
+    if ip netns list | grep -q "$NS_NAME"; then
+        echo "Namespace $NS_NAME already exists. Run 'down' first."
+        exit 1
+    fi
+    ip netns add "$NS_NAME"
+
+    # 2. Create veth pair
+    ip link add "$VETH_HOST" type veth peer name "$VETH_NS"
+
+    # 3. Move peer interface to namespace
+    ip link set "$VETH_NS" netns "$NS_NAME"
+
+    # 4. Configure Host Side Interface
+    ip addr add "${HOST_IP}/${SUBNET_CIDR}" dev "$VETH_HOST"
+    ip link set "$VETH_HOST" up
+
+    # 5. Configure Namespace Side Interface
+    ip netns exec "$NS_NAME" ip addr add "${NS_IP}/${SUBNET_CIDR}" dev "$VETH_NS"
+    ip netns exec "$NS_NAME" ip link set "$VETH_NS" up
+    
+    # 6. Bring up loopback inside namespace (crucial for many apps)
+    ip netns exec "$NS_NAME" ip link set lo up
+
+    # 7. Routing: Add default gateway inside namespace pointing to host
+    ip netns exec "$NS_NAME" ip route add default via "$HOST_IP"
+
+    # 8. Enable IP forwarding on host
+    echo 1 > /proc/sys/net/ipv4/ip_forward
+
+    # 9. NAT/Masquerade: Allow traffic from namespace to go out physical interface
+    # We verify rule doesn't exist first to avoid duplicates
+    iptables -t nat -C POSTROUTING -s "${NS_IP}/${SUBNET_CIDR}" -o "$PHY_IFACE" -j MASQUERADE 2>/dev/null || \
+    iptables -t nat -A POSTROUTING -s "${NS_IP}/${SUBNET_CIDR}" -o "$PHY_IFACE" -j MASQUERADE
+
+    # Allow forwarding from host veth to WAN and back
+    iptables -C FORWARD -i "$VETH_HOST" -o "$PHY_IFACE" -j ACCEPT 2>/dev/null || \
+    iptables -A FORWARD -i "$VETH_HOST" -o "$PHY_IFACE" -j ACCEPT
+
+    iptables -C FORWARD -i "$PHY_IFACE" -o "$VETH_HOST" -j ACCEPT 2>/dev/null || \
+    iptables -A FORWARD -i "$PHY_IFACE" -o "$VETH_HOST" -j ACCEPT
+
+    # 10. DNS Setup
+    # Netns uses /etc/netns/<name>/resolv.conf if it exists
+    mkdir -p "/etc/netns/$NS_NAME"
+    echo "nameserver $DNS_SERVER" > "/etc/netns/$NS_NAME/resolv.conf"
+
+    echo "Namespace $NS_NAME is UP."
+    echo "To enter shell: sudo ip netns exec $NS_NAME bash"
+}
+
+teardown_ns() {
+    echo "Tearing down namespace '$NS_NAME'..."
+
+    # 1. Remove Namespace (this automatically deletes the veth pair inside it)
+    # The host side veth usually disappears when the peer is destroyed.
+    if ip netns list | grep -q "$NS_NAME"; then
+        ip netns del "$NS_NAME"
+    else
+        echo "Namespace $NS_NAME does not exist."
+    fi
+
+    # 2. Clean up veth host side if it still lingers
+    if ip link show "$VETH_HOST" > /dev/null 2>&1; then
+        ip link delete "$VETH_HOST"
+    fi
+
+    # 3. Remove iptables rules
+    # We use -D to delete the specific rules we added
+    iptables -t nat -D POSTROUTING -s "${NS_IP}/${SUBNET_CIDR}" -o "$PHY_IFACE" -j MASQUERADE 2>/dev/null
+    iptables -D FORWARD -i "$VETH_HOST" -o "$PHY_IFACE" -j ACCEPT 2>/dev/null
+    iptables -D FORWARD -i "$PHY_IFACE" -o "$VETH_HOST" -j ACCEPT 2>/dev/null
+
+    # 4. Remove DNS config
+    rm -rf "/etc/netns/$NS_NAME"
+
+    echo "Namespace $NS_NAME is DOWN."
+}
+
+test_connectivity() {
+    echo "Testing connectivity inside $NS_NAME..."
+    ip netns exec "$NS_NAME" ping -c 3 8.8.8.8
+}
+
+# Main execution logic
+check_root
+
+case "$1" in
+    up)
+        setup_ns
+        ;;
+    down)
+        teardown_ns
+        ;;
+    test)
+        test_connectivity
+        ;;
+    *)
+        echo "Usage: $0 {up|down|test}"
+        exit 1
+esac