Move monitoring.kaareskovgaard.net to new openbao setup

rust/program/hetzner-static-ip/src/iproute2.rs

@@ -0,0 +1,68 @@
+use std::collections::BTreeSet;
+
+use anyhow::Context as _;
+use common::proc::Command;
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+struct Link {
+    ifname: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct Addr {
+    addr_info: Vec<AddrInfo>,
+}
+
+#[derive(Debug, Deserialize)]
+struct AddrInfo {
+    local: String,
+    prefixlen: usize,
+}
+
+#[derive(Debug, Deserialize)]
+struct Route {
+    dst: String,
+    gateway: Option<String>,
+}
+
+pub fn get_link_names() -> anyhow::Result<BTreeSet<String>> {
+    let mut proc = Command::new("ip");
+    proc.args(["-j", "link"]);
+    let out = proc.try_spawn_to_json::<Vec<Link>>()?;
+
+    Ok(out.into_iter().map(|l| l.ifname).collect())
+}
+
+pub fn has_ipv6_address(dev: &str, addr: &str) -> anyhow::Result<bool> {
+    let mut proc = Command::new("ip");
+    proc.args(["-j", "-6", "addr", "show", dev]);
+
+    let out: Vec<Addr> = proc.try_spawn_to_json()?;
+
+    let idx = addr
+        .char_indices()
+        .find_map(|(idx, ch)| if ch == '/' { Some(idx) } else { None })
+        .expect("Address should contain prefixlen");
+    let prefixlen = &addr[idx + 1..];
+    let addr = &addr[..idx];
+    let prefixlen: usize = prefixlen
+        .parse()
+        .context("Ipv6 prefixlen was not a usize")?;
+    Ok(out.iter().any(|a| {
+        a.addr_info
+            .iter()
+            .any(|a| a.local == addr && a.prefixlen == prefixlen)
+    }))
+}
+
+pub fn has_default_route(dev: &str, gateway: &str) -> anyhow::Result<bool> {
+    let mut proc = Command::new("ip");
+    proc.args(["-j", "-6", "route", "show", "dev", dev]);
+
+    let out: Vec<Route> = proc.try_spawn_to_json()?;
+
+    Ok(out
+        .iter()
+        .any(|r| r.dst == "default" && r.gateway.as_deref().is_some_and(|gw| gw == gateway)))
+}