network_interface/target/unix/
mod.rs

1pub mod ffi;
2
3use std::collections::HashMap;
4
5use std::net::{Ipv4Addr, Ipv6Addr};
6use std::slice::from_raw_parts;
7
8use libc::{AF_INET, AF_INET6, sockaddr_in, sockaddr_in6, strlen, AF_LINK, if_nametoindex};
9
10use crate::target::ffi::lladdr;
11use crate::target::getifaddrs;
12use crate::{Error, NetworkInterface, NetworkInterfaceConfig, Result};
13use crate::utils::{ipv4_from_in_addr, ipv6_from_in6_addr, make_ipv4_netmask, make_ipv6_netmask};
14
15impl NetworkInterfaceConfig for NetworkInterface {
16    fn show() -> Result<Vec<NetworkInterface>> {
17        let mut network_interfaces: HashMap<String, NetworkInterface> = HashMap::new();
18
19        for netifa in getifaddrs()? {
20            let netifa_addr = netifa.ifa_addr;
21            let netifa_family = if netifa_addr.is_null() {
22                continue;
23            } else {
24                unsafe { (*netifa_addr).sa_family as i32 }
25            };
26
27            let mut network_interface = match netifa_family {
28                AF_LINK => {
29                    let name = make_netifa_name(&netifa)?;
30                    let mac = make_mac_addrs(&netifa);
31                    let index = netifa_index(&netifa);
32                    NetworkInterface {
33                        name,
34                        mac_addr: Some(mac),
35                        addr: Vec::new(),
36                        index,
37                    }
38                }
39                AF_INET => {
40                    let socket_addr = netifa_addr as *mut sockaddr_in;
41                    let internet_address = unsafe { (*socket_addr).sin_addr };
42                    let name = make_netifa_name(&netifa)?;
43                    let index = netifa_index(&netifa);
44                    let netmask = make_ipv4_netmask(&netifa);
45                    let addr = ipv4_from_in_addr(&internet_address)?;
46                    let broadcast = make_ipv4_broadcast_addr(&netifa)?;
47                    NetworkInterface::new_afinet(name.as_str(), addr, netmask, broadcast, index)
48                }
49                AF_INET6 => {
50                    let socket_addr = netifa_addr as *mut sockaddr_in6;
51                    let internet_address = unsafe { (*socket_addr).sin6_addr };
52                    let name = make_netifa_name(&netifa)?;
53                    let index = netifa_index(&netifa);
54                    let netmask = make_ipv6_netmask(&netifa);
55                    let addr = ipv6_from_in6_addr(&internet_address)?;
56                    let broadcast = make_ipv6_broadcast_addr(&netifa)?;
57                    NetworkInterface::new_afinet6(name.as_str(), addr, netmask, broadcast, index)
58                }
59                _ => continue,
60            };
61
62            network_interfaces
63                .entry(network_interface.name.clone())
64                .and_modify(|old| old.addr.append(&mut network_interface.addr))
65                .or_insert(network_interface);
66        }
67
68        Ok(network_interfaces.into_values().collect())
69    }
70}
71
72/// Retrieves the network interface name
73fn make_netifa_name(netifa: &libc::ifaddrs) -> Result<String> {
74    let data = netifa.ifa_name as *mut u8;
75    let len = unsafe { strlen(data as *const _) };
76    let bytes_slice = unsafe { from_raw_parts(data, len) };
77    let string = String::from_utf8(bytes_slice.to_vec()).map_err(Error::from)?;
78
79    Ok(string)
80}
81
82/// Retrieves the broadcast address for the network interface provided of the
83/// AF_INET family.
84///
85/// ## References
86///
87/// https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getifaddrs.3.html
88fn make_ipv4_broadcast_addr(netifa: &libc::ifaddrs) -> Result<Option<Ipv4Addr>> {
89    let ifa_dstaddr = netifa.ifa_dstaddr;
90
91    if ifa_dstaddr.is_null() {
92        return Ok(None);
93    }
94
95    let socket_addr = ifa_dstaddr as *mut sockaddr_in;
96    let internet_address = unsafe { (*socket_addr).sin_addr };
97    let addr = ipv4_from_in_addr(&internet_address)?;
98
99    Ok(Some(addr))
100}
101
102/// Retrieves the broadcast address for the network interface provided of the
103/// AF_INET6 family.
104///
105/// ## References
106///
107/// https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/getifaddrs.3.html
108fn make_ipv6_broadcast_addr(netifa: &libc::ifaddrs) -> Result<Option<Ipv6Addr>> {
109    let ifa_dstaddr = netifa.ifa_dstaddr;
110
111    if ifa_dstaddr.is_null() {
112        return Ok(None);
113    }
114
115    let socket_addr = ifa_dstaddr as *mut sockaddr_in6;
116    let internet_address = unsafe { (*socket_addr).sin6_addr };
117    let addr = ipv6_from_in6_addr(&internet_address)?;
118
119    Ok(Some(addr))
120}
121
122fn make_mac_addrs(netifa: &libc::ifaddrs) -> String {
123    let mut mac = [0; 6];
124    let mut ptr = unsafe { lladdr(netifa as *const libc::ifaddrs as *mut _) };
125
126    for el in &mut mac {
127        *el = unsafe { *ptr };
128        ptr = ((ptr as usize) + 1) as *const u8;
129    }
130
131    format!(
132        "{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}",
133        mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
134    )
135}
136
137/// Retreives the name for the the network interface provided
138///
139/// ## References
140///
141/// https://man7.org/linux/man-pages/man3/if_nametoindex.3.html
142fn netifa_index(netifa: &libc::ifaddrs) -> u32 {
143    let name = netifa.ifa_name as *const libc::c_char;
144
145    unsafe { if_nametoindex(name) }
146}
network_interface/target/unix/mod.rs

network_interface/target/unix/
mod.rs
