feat(iroh-net): PCP probe

- Adds PCP support for the Announce Opcode and implemented probing for PCP
- Add metrics for PCP probes
- Add a port-map-probe command to pick what subset of protocols to probe

Ref #910

iroh-metrics/src/portmap.rs

@@ -22,6 +22,12 @@ pub struct Metrics {
     pub upnp_probes_failed: Counter,
     pub upnp_available: Counter,
     pub upnp_gateway_updated: Counter,
+
+    /*
+     * PCP metrics
+     */
+    pub pcp_probes: Counter,
+    pub pcp_available: Counter,
 }
 
 impl Default for Metrics {
@@ -44,6 +50,12 @@ impl Default for Metrics {
             upnp_gateway_updated: Counter::new(
                 "Number of UPnP probes that resulted in a gateway different to the previous one.",
             ),
+
+            /*
+             * PCP metrics
+             */
+            pcp_probes: Counter::new("Number of PCP probes executed."),
+            pcp_available: Counter::new("Number of PCP probes that found it available."),
         }
     }
 }

iroh-net/Cargo.toml

@@ -73,6 +73,7 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"], optional = tr
 
 # metrics
 iroh-metrics = { path = "../iroh-metrics", optional = true }
+num_enum = "0.6.1"
 
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
 netlink-packet-route = "0.17.0"
@@ -85,6 +86,7 @@ wmi = "0.13"
 clap = { version = "4", features = ["derive"] }
 ntest = "*"
 pretty_assertions = "1.4"
+rand_chacha = "0.3.1"
 tokio = { version = "1", features = ["io-util", "sync", "rt", "net", "fs", "macros", "time", "test-util"] }
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 

iroh-net/src/hp/magicsock/conn.rs

@@ -281,7 +281,7 @@ impl Conn {
     }
 
     async fn with_name(name: String, opts: Options) -> Result<Self> {
-        let port_mapper = portmapper::Client::new().await;
+        let port_mapper = portmapper::Client::default().await;
 
         let Options {
             port,