rust_network_mgr/
nftables.rs

1use crate::types::{AppConfig, NetworkState, Result};
2
3/// Manages NFTables rules based on network state.
4pub struct NftablesManager {
5    config: AppConfig, // May need specific nftables config later
6    // Add state if needed, e.g., loaded templates
7}
8
9impl NftablesManager {
10    pub fn new(config: AppConfig) -> Self {
11        NftablesManager { config }
12    }
13
14    /// Loads rule templates or configurations.
15    /// Placeholder for now.
16    pub fn load_rules(&mut self) -> Result<()> {
17        tracing::info!(
18            "Loading NFTables rules (currently a placeholder) from path: {:?}",
19            self.config.nftables_rules_path
20        );
21        // TODO: Implement loading logic (e.g., read template files)
22        Ok(())
23    }
24
25    /// Applies NFTables rules based on the current network state.
26    /// Placeholder implementation - logs the intended action.
27    pub async fn apply_rules(&self, state: &NetworkState) -> Result<()> {
28        tracing::info!(
29            "Applying NFTables rules (placeholder) for state: {:?}",
30            state
31        );
32
33        // --- Placeholder Logic --- 
34        // In a real implementation:
35        // 1. Generate nftables rules based on `state` and `self.config`.
36        //    - Iterate through `state.interface_ips`.
37        //    - Find corresponding `InterfaceConfig` in `self.config.interfaces`.
38        //    - Use `nftables_zone` and IP addresses to generate rules (e.g., update sets).
39        // 2. Apply the rules atomically.
40        //    - Option A: Use `nftnl` library to construct and send Netlink messages.
41        //    - Option B: Generate an `nft` script and execute `nft -f /path/to/script`.
42
43        for (if_name, ips) in &state.interface_ips {
44             if let Some(if_config) = self.config.interfaces.iter().find(|i| &i.name == if_name) {
45                 if let Some(zone) = &if_config.nftables_zone {
46                    tracing::debug!(
47                        "Would update nftables set for zone '{}' on interface '{}' with IPs: {:?}",
48                        zone, if_name, ips
49                    );
50                    // Example using `nft` command (requires error handling and proper escaping):
51                    // let ip_list = ips.iter().map(|ip| ip.to_string()).collect::<Vec<_>>().join(", ");
52                    // let command = format!("nft add element inet filter {}_ips {{ {} }}", zone, ip_list);
53                    // tracing::debug!("Executing: {}", command);
54                    // let output = tokio::process::Command::new("nft")
55                    //     .arg(command)
56                    //     .output()
57                    //     .await
58                    //     .map_err(|e| AppError::Nftables(format!("Failed to execute nft: {}", e)))?;
59                    // if !output.status.success() {
60                    //     return Err(AppError::Nftables(format!(
61                    //         "nft command failed: {}\nStderr: {}",
62                    //         command,
63                    //         String::from_utf8_lossy(&output.stderr)
64                    //     )));
65                    // }
66                 }
67             }
68        }
69
70        tracing::warn!("NFTables rule application is currently a placeholder.");
71        Ok(())
72    }
73}
74
75#[cfg(test)]
76pub mod tests {
77    use super::*;
78    use crate::types::{AppConfig, InterfaceConfig, NetworkState};
79    use std::collections::HashMap;
80    use std::net::IpAddr;
81
82    fn create_test_config() -> AppConfig {
83        AppConfig {
84            interfaces: vec![
85                InterfaceConfig {
86                    name: "eth0".to_string(),
87                    dhcp: Some(true),
88                    address: None,
89                    nftables_zone: Some("wan".to_string()),
90                },
91                InterfaceConfig {
92                    name: "eth1".to_string(),
93                    dhcp: None,
94                    address: Some("192.168.1.1/24".to_string()),
95                    nftables_zone: Some("lan".to_string()),
96                },
97            ],
98            socket_path: None,
99            nftables_rules_path: Some("/tmp/nft_rules".to_string()),
100        }
101    }
102
103    #[tokio::test]
104    async fn test_apply_rules_placeholder() {
105        let config = create_test_config();
106        let manager = NftablesManager::new(config);
107        let mut state = NetworkState::new();
108        state.interface_ips.insert(
109            "eth0".to_string(),
110            vec!["1.1.1.1".parse::<IpAddr>().unwrap()],
111        );
112         state.interface_ips.insert(
113            "eth1".to_string(),
114            vec!["192.168.1.5".parse::<IpAddr>().unwrap(), "fe80::1".parse::<IpAddr>().unwrap()],
115        );
116
117        // This just checks that the placeholder function runs without panic
118        let result = manager.apply_rules(&state).await;
119        assert!(result.is_ok());
120    }
121
122     #[tokio::test]
123    async fn test_load_rules_placeholder() {
124        let config = create_test_config();
125        let mut manager = NftablesManager::new(config);
126
127        // This just checks that the placeholder function runs without panic
128        let result = manager.load_rules();
129        assert!(result.is_ok());
130    }
131}
rust_network_mgr/nftables.rs

rust_network_mgr/
nftables.rs
