List interfaces on Mac

[netwatcher] / src / imp_mac.rs

diff --git a/src/imp_mac.rs b/src/imp_mac.rs
new file mode 100644 (file)
index 0000000..c4fc8d6
--- /dev/null
+++ b/src/imp_mac.rs
@@ -0,0 +1,72 @@
+use std::{collections::HashMap, net::IpAddr};
+
+use nix::{ifaddrs::getifaddrs, net::if_::if_nametoindex};
+
+use crate::util::format_mac;
+use crate::{Error, IfIndex, Interface};
+
+struct CandidateInterface {
+    name: String,
+    index: u32,
+    hw_addr: Option<String>,
+    ips: Vec<IpAddr>,
+}
+
+pub(crate) fn list_interfaces() -> Result<HashMap<IfIndex, Interface>, Error> {
+    let addrs = getifaddrs().map_err(|_| Error::Internal)?;
+    let mut candidates = HashMap::new();
+
+    for addr in addrs {
+        let index = if_nametoindex(addr.interface_name.as_str()).map_err(|_| Error::Internal)?;
+        let candidate = candidates
+            .entry(addr.interface_name.clone())
+            .or_insert_with(|| CandidateInterface {
+                name: addr.interface_name.clone(),
+                index,
+                hw_addr: None,
+                ips: vec![],
+            });
+        if let Some(a) = addr.address {
+            if let Some(a) = a.as_link_addr() {
+                if let Some(raw_addr) = a.addr() {
+                    candidate.hw_addr = Some(format_mac(&raw_addr)?);
+                }
+            }
+            if let Some(a) = a.as_sockaddr_in() {
+                candidate.ips.push(IpAddr::V4(a.ip()));
+            }
+            if let Some(a) = a.as_sockaddr_in6() {
+                candidate.ips.push(IpAddr::V6(a.ip()));
+            }
+        }
+    }
+
+    let ifs = candidates
+        .drain()
+        .flat_map(|(_, c)| {
+            c.hw_addr.map(|hw_addr| {
+                (
+                    c.index,
+                    Interface {
+                        index: c.index,
+                        hw_addr,
+                        name: c.name,
+                        ips: c.ips,
+                    },
+                )
+            })
+        })
+        .collect();
+    Ok(ifs)
+}
+
+#[cfg(test)]
+mod test {
+    use super::list_interfaces;
+
+    #[test]
+    fn list() {
+        let ifaces = list_interfaces().unwrap();
+        println!("{:?}", ifaces);
+    }
+}