improve user experience

1. add config generator to easytier-web
2. add command to show tcp/kcp proxy entries

easytier/src/proto/cli.proto

@@ -177,3 +177,39 @@ service VpnPortalRpc {
   rpc GetVpnPortalInfo(GetVpnPortalInfoRequest)
       returns (GetVpnPortalInfoResponse);
 }
+
+enum TcpProxyEntryTransportType {
+  TCP = 0;
+  KCP = 1;
+}
+
+enum TcpProxyEntryState {
+    Unknown = 0;
+    // receive syn packet but not start connecting to dst
+    SynReceived = 1;
+    // connecting to dst
+    ConnectingDst = 2;
+    // connected to dst
+    Connected = 3;
+    // connection closed
+    Closed = 4;
+}
+
+message TcpProxyEntry {
+  common.SocketAddr src = 1;
+  common.SocketAddr dst = 2;
+  uint64 start_time = 3;
+  TcpProxyEntryState state = 4;
+  TcpProxyEntryTransportType transport_type = 5;
+}
+
+message ListTcpProxyEntryRequest {}
+
+message ListTcpProxyEntryResponse {
+  repeated TcpProxyEntry entries = 1;
+}
+
+service TcpProxyRpc {
+  rpc ListTcpProxyEntry(ListTcpProxyEntryRequest)
+      returns (ListTcpProxyEntryResponse);
+}

easytier/src/proto/common.rs

@@ -101,7 +101,11 @@ impl From<cidr::Ipv4Inet> for Ipv4Inet {
 
 impl From<Ipv4Inet> for cidr::Ipv4Inet {
     fn from(value: Ipv4Inet) -> Self {
-        cidr::Ipv4Inet::new(value.address.unwrap().into(), value.network_length as u8).unwrap()
+        cidr::Ipv4Inet::new(
+            value.address.unwrap_or_default().into(),
+            value.network_length as u8,
+        )
+        .unwrap()
     }
 }
 
@@ -168,6 +172,9 @@ impl From<std::net::SocketAddr> for SocketAddr {
 
 impl From<SocketAddr> for std::net::SocketAddr {
     fn from(value: SocketAddr) -> Self {
+        if value.ip.is_none() {
+            return "0.0.0.0:0".parse().unwrap();
+        }
         match value.ip.unwrap() {
             socket_addr::Ip::Ipv4(ip) => std::net::SocketAddr::V4(std::net::SocketAddrV4::new(
                 std::net::Ipv4Addr::from(ip),

easytier/src/proto/peer_rpc.proto

@@ -207,5 +207,6 @@ message HandshakeRequest {
 }
 
 message KcpConnData {
+  common.SocketAddr src = 1;
   common.SocketAddr dst = 4;
 }