Improve usability for Getlink and fix unit tests

.githooks/pre-commit

@@ -13,12 +13,14 @@ cargo fmt -- --check \
     && ./target/debug/examples/ctrl-list \
     && ./target/debug/examples/error_packet \
     && ./target/debug/examples/nl80211 \
+    && ./target/debug/examples/getlink \
     && cargo build --examples --features=async \
     && ./target/debug/examples/getips \
     && ./target/debug/examples/route-list \
     && ./target/debug/examples/ctrl-list \
     && ./target/debug/examples/error_packet \
     && ./target/debug/examples/nl80211 \
+    && ./target/debug/examples/getlink \
     && cargo test \
     && cargo test --all-targets --all-features \
     || exit 1

.github/workflows/main.yml

@@ -88,6 +88,8 @@ jobs:
         run: ./target/debug/examples/route-list
       - name: Run error_packet 
         run: ./target/debug/examples/error_packet
+      - name: Run getlink
+        run: ./target/debug/examples/getlink
         # nl80211 not included due to no wireless interfaces on test machines
   musl-checks:
     strategy:
@@ -143,6 +145,8 @@ jobs:
         run: ./target/debug/examples/route-list
       - name: Run error_packet 
         run: ./target/debug/examples/error_packet
+      - name: Run getlink
+        run: ./target/debug/examples/getlink
         # nl80211 not included due to no wireless interfaces on test machines
 
 concurrency:

examples/getlink.rs

@@ -0,0 +1,41 @@
+use neli::{
+    consts::{
+        nl::NlmF,
+        rtnl::{Ifla, RtAddrFamily, Rtm},
+        socket::NlFamily,
+    },
+    nl::NlPayload,
+    router::synchronous::NlRouter,
+    rtnl::{Ifinfomsg, IfinfomsgBuilder},
+    utils::Groups,
+};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    env_logger::init();
+
+    let (rtnl, _) = NlRouter::connect(NlFamily::Route, None, Groups::empty())?;
+    rtnl.enable_ext_ack(true)?;
+    rtnl.enable_strict_checking(true)?;
+    let ifinfomsg = IfinfomsgBuilder::default()
+        .ifi_family(RtAddrFamily::Inet)
+        .build()?;
+
+    let recv = rtnl.send::<_, _, Rtm, Ifinfomsg>(
+        Rtm::Getlink,
+        NlmF::DUMP | NlmF::ACK,
+        NlPayload::Payload(ifinfomsg),
+    )?;
+    for response in recv {
+        if let Some(payload) = response?.get_payload() {
+            println!(
+                "{:?}",
+                payload
+                    .rtattrs()
+                    .get_attr_handle()
+                    .get_attr_payload_as_with_len::<String>(Ifla::Ifname)?,
+            )
+        }
+    }
+
+    Ok(())
+}

src/rtnl.rs

@@ -34,9 +34,11 @@ pub struct Ifinfomsg {
     padding: u8,
     /// Interface type
     #[getset(get = "pub")]
+    #[builder(default = "Arphrd::from(0)")]
     ifi_type: Arphrd,
     /// Interface index
     #[getset(get = "pub")]
+    #[builder(default = "0")]
     ifi_index: libc::c_int,
     /// Interface flags
     #[getset(get = "pub")]
@@ -428,6 +430,7 @@ mod test {
 
     use crate::{
         consts::{nl::NlmF, socket::NlFamily},
+        err::RouterError,
         nl::NlPayload,
         router::synchronous::NlRouter,
         test::setup,
@@ -474,31 +477,41 @@ mod test {
 
         let (sock, _) = NlRouter::connect(NlFamily::Route, None, Groups::empty()).unwrap();
         sock.enable_strict_checking(true).unwrap();
-        let recv = sock
+        let mut recv = sock
             .send::<_, _, Rtm, Ifinfomsg>(
                 Rtm::Getlink,
                 NlmF::DUMP | NlmF::ACK,
                 NlPayload::Payload(
                     IfinfomsgBuilder::default()
                         .ifi_family(RtAddrFamily::Unspecified)
-                        .ifi_type(Arphrd::None)
-                        .ifi_index(0)
                         .build()
                         .unwrap(),
                 ),
             )
             .unwrap();
-        for msg in recv {
-            let msg = msg.unwrap();
-            if let Some(payload) = msg.get_payload() {
-                let handle = payload.rtattrs.get_attr_handle();
-                handle
-                    .get_attr_payload_as_with_len::<String>(Ifla::Ifname)
-                    .unwrap();
-                // Assert length of ethernet address
-                if let Ok(attr) = handle.get_attr_payload_as_with_len::<Vec<u8>>(Ifla::Address) {
-                    assert_eq!(attr.len(), 6);
-                }
+        let all_msgs = recv
+            .try_fold(Vec::new(), |mut v, m| {
+                v.push(m?);
+                Result::<_, RouterError<Rtm, Ifinfomsg>>::Ok(v)
+            })
+            .unwrap();
+        let non_err_payloads = all_msgs.iter().fold(Vec::new(), |mut v, m| {
+            if let Some(p) = m.get_payload() {
+                v.push(p);
+            }
+            v
+        });
+        if non_err_payloads.is_empty() {
+            panic!("Only received done message and no additional information");
+        }
+        for payload in non_err_payloads {
+            let handle = payload.rtattrs.get_attr_handle();
+            handle
+                .get_attr_payload_as_with_len::<String>(Ifla::Ifname)
+                .unwrap();
+            // Assert length of ethernet address
+            if let Ok(attr) = handle.get_attr_payload_as_with_len::<Vec<u8>>(Ifla::Address) {
+                assert_eq!(attr.len(), 6);
             }
         }
     }

src/socket/synchronous.rs

@@ -76,6 +76,7 @@ impl NlSocketHandle {
 
         let mut buffer = Cursor::new(vec![0; msg.padded_size()]);
         msg.to_bytes(&mut buffer)?;
+        trace!("Buffer sent: {:?}", buffer.get_ref());
         self.socket.send(buffer.get_ref(), Msg::empty())?;
 
         Ok(())