Add basic NAT structures

virtweb_backend/src/nat/nat_lib.rs

@@ -0,0 +1,61 @@
+use crate::app_config::AppConfig;
+use crate::libvirt_rest_structures::net::{NetworkInfo, NetworkName};
+use crate::nat::nat_definition::NetNat;
+
+#[derive(thiserror::Error, Debug)]
+enum NatLibError {
+    #[error("Could not save nat definition, because network bridge name was not specified!")]
+    MissingNetworkBridgeName,
+}
+
+/// Save nat definition
+pub fn save_nat_def(net: &NetworkInfo) -> anyhow::Result<()> {
+    let nat = match net.has_nat_def() {
+        true => NetNat {
+            interface: net
+                .bridge_name
+                .as_ref()
+                .ok_or(NatLibError::MissingNetworkBridgeName)?
+                .to_string(),
+            ipv4: net
+                .ip_v4
+                .as_ref()
+                .map(|i| i.nat.clone())
+                .unwrap_or_default(),
+            ipv6: net
+                .ip_v6
+                .as_ref()
+                .map(|i| i.nat.clone())
+                .unwrap_or_default(),
+        },
+        false => NetNat::default(),
+    };
+
+    let json = serde_json::to_string(&nat)?;
+
+    std::fs::write(AppConfig::get().net_nat_path(&net.name), json)?;
+
+    Ok(())
+}
+
+/// Remove nat definition, if existing
+pub fn remove_nat_def(name: &NetworkName) -> anyhow::Result<()> {
+    let nat_file = AppConfig::get().net_nat_path(name);
+    if nat_file.exists() {
+        std::fs::remove_file(nat_file)?;
+    }
+
+    Ok(())
+}
+
+/// Load nat definition, if available
+pub fn load_nat_def(name: &NetworkName) -> anyhow::Result<NetNat> {
+    let nat_file = AppConfig::get().net_nat_path(name);
+    if !nat_file.exists() {
+        return Ok(NetNat::default());
+    }
+
+    let file = std::fs::read_to_string(nat_file)?;
+
+    Ok(serde_json::from_str(&file)?)
+}