ant_quic/discovery/
linux.rs

1// Copyright 2024 Saorsa Labs Ltd.
2//
3// This Saorsa Network Software is licensed under the General Public License (GPL), version 3.
4// Please see the file LICENSE-GPL, or visit <http://www.gnu.org/licenses/> for the full text.
5//
6// Full details available at https://saorsalabs.com/licenses
7
8//! Linux Network Discovery Implementation
9//!
10//! This module implements network interface discovery for Linux using the
11//! Netlink API. It provides comprehensive error handling and interface caching.
12
13// Note: Future netlink implementation could use netlink-packet-route crates
14// For now, using libc netlink sockets directly in candidate_discovery/linux.rs
15use std::collections::HashMap;
16use std::net::{IpAddr, SocketAddr};
17use std::time::{Duration, Instant};
18
19use super::{DiscoveryError, NetworkDiscovery, NetworkInterface};
20
21/// Linux-specific network discovery implementation
22pub struct LinuxDiscovery {
23    // Cache of discovered interfaces
24    cache: Option<InterfaceCache>,
25    // Cache refresh interval
26    cache_refresh_interval: Duration,
27}
28
29/// Cache for network interfaces
30struct InterfaceCache {
31    // Cached interfaces
32    interfaces: Vec<NetworkInterface>,
33    // Last refresh time
34    last_refresh: Instant,
35}
36
37impl LinuxDiscovery {
38    /// Create a new Linux discovery instance
39    pub fn new(cache_refresh_interval: Duration) -> Self {
40        Self {
41            cache: None,
42            cache_refresh_interval,
43        }
44    }
45
46    /// Refresh the interface cache if needed
47    fn refresh_cache_if_needed(&mut self) -> Result<(), DiscoveryError> {
48        let should_refresh = match &self.cache {
49            Some(cache) => cache.last_refresh.elapsed() >= self.cache_refresh_interval,
50            None => true,
51        };
52
53        if should_refresh {
54            self.refresh_cache()?;
55        }
56
57        Ok(())
58    }
59
60    /// Force refresh the interface cache
61    fn refresh_cache(&mut self) -> Result<(), DiscoveryError> {
62        // Placeholder - actual implementation would use Linux Netlink API
63        let interfaces = self.get_interfaces_from_system()?;
64
65        self.cache = Some(InterfaceCache {
66            interfaces,
67            last_refresh: Instant::now(),
68        });
69
70        Ok(())
71    }
72
73    /// Get interfaces from the system using Linux Netlink API
74    fn get_interfaces_from_system(&self) -> Result<Vec<NetworkInterface>, DiscoveryError> {
75        // Placeholder - actual implementation would use Linux Netlink API
76        // to enumerate network interfaces and their addresses
77
78        Ok(Vec::new())
79    }
80}
81
82impl NetworkDiscovery for LinuxDiscovery {
83    fn discover_interfaces(&self) -> Result<Vec<NetworkInterface>, DiscoveryError> {
84        // Use cached interfaces if available and not expired
85        if let Some(cache) = &self.cache {
86            if cache.last_refresh.elapsed() < self.cache_refresh_interval {
87                return Ok(cache.interfaces.clone());
88            }
89        }
90
91        // Otherwise, refresh the cache (only if needed)
92        let mut this = self.clone();
93        this.refresh_cache_if_needed()?;
94
95        // Return the refreshed interfaces
96        match &this.cache {
97            Some(cache) => Ok(cache.interfaces.clone()),
98            None => Err(DiscoveryError::InternalError("Cache refresh failed".into())),
99        }
100    }
101
102    fn get_default_route(&self) -> Result<Option<SocketAddr>, DiscoveryError> {
103        // Placeholder - actual implementation would determine the default route
104        // using the Linux Netlink API
105
106        Ok(None)
107    }
108}
109
110impl Clone for LinuxDiscovery {
111    fn clone(&self) -> Self {
112        Self {
113            cache: self.cache.clone(),
114            cache_refresh_interval: self.cache_refresh_interval,
115        }
116    }
117}
118
119impl Clone for InterfaceCache {
120    fn clone(&self) -> Self {
121        Self {
122            interfaces: self.interfaces.clone(),
123            last_refresh: self.last_refresh,
124        }
125    }
126}
ant_quic/discovery/linux.rs

ant_quic/discovery/
linux.rs
