3 files changed, 74 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 5a09a45..e27c7d7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,21 @@
 version = 4
 
 [[package]]
+name = "ipnet"
+version = "2.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "469fb0b9cefa57e3ef31275ee7cacb78f2fdca44e4765491884a2b119d4eb130"
+
+[[package]]
+name = "libc"
+version = "0.2.176"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58f929b4d672ea937a23a1ab494143d968337a5f47e56d0815df1e0890ddf174"
+
+[[package]]
 name = "netiso"
 version = "0.1.0"
+dependencies = [
+ "ipnet",
+ "libc",
+]
diff --git a/Cargo.toml b/Cargo.toml
index b0abcfb..9a079c1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
+ipnet = "2.11.0"
+libc = "0.2.176"
diff --git a/src/main.rs b/src/main.rs
index 07e4eec..321b5ea 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,6 +6,8 @@ pub mod wire;
 use std::io::{BufRead, Cursor, Read, Result, Write};
 use std::net::{Ipv4Addr, SocketAddr, SocketAddrV4, UdpSocket};
 
+use ipnet::Ipv4Net;
+
 const FLAG_BROADCAST: u16 = 1 << 15;
 
 const OPTION_CODE_PAD: u8 = 0;
@@ -347,6 +349,60 @@ fn write_boot_ack(xid: u32, chaddr: [u8; 16], client_uuid: Option<Vec<u8>>) -> R
     Ok(writer)
 }
 
+#[derive(Debug, Clone)]
+struct InterfaceAddr {
+    interface: String,
+    address: Ipv4Addr,
+    network: Ipv4Net,
+}
+
+fn list_network_interfaces() -> Result<Vec<InterfaceAddr>> {
+    unsafe {
+        let mut ifap: *mut libc::ifaddrs = std::ptr::null_mut();
+
+        if libc::getifaddrs(&mut ifap) != 0 {
+            return Err(std::io::Error::last_os_error());
+        }
+
+        let mut interfaces = Vec::new();
+        let mut current = ifap;
+
+        while !current.is_null() {
+            let ifa = &*current;
+
+            if !ifa.ifa_addr.is_null() {
+                let addr_family = (*ifa.ifa_addr).sa_family;
+                let name = std::ffi::CStr::from_ptr(ifa.ifa_name)
+                    .to_string_lossy()
+                    .into_owned();
+
+                match addr_family as i32 {
+                    libc::AF_INET => {
+                        let addr = ifa.ifa_addr as *const libc::sockaddr_in;
+                        let mask = ifa.ifa_netmask as *const libc::sockaddr_in;
+
+                        let addr = Ipv4Addr::from((*addr).sin_addr.s_addr.to_ne_bytes());
+                        let mask = Ipv4Addr::from((*mask).sin_addr.s_addr.to_ne_bytes());
+                        let network = Ipv4Net::with_netmask(addr, mask).unwrap().trunc();
+
+                        interfaces.push(InterfaceAddr {
+                            interface: name,
+                            address: addr,
+                            network,
+                        });
+                    }
+                    _ => {}
+                }
+            }
+
+            current = ifa.ifa_next;
+        }
+
+        libc::freeifaddrs(ifap);
+        Ok(interfaces)
+    }
+}
+
 fn main() {
     let socket67 = UdpSocket::bind("0.0.0.0:67").unwrap();
     socket67.set_broadcast(true).unwrap();