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Send ClientID to the DHCP Server, Send Hostname to the DHCP Server

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This commit is contained in:
Xnoe 2022-11-16 15:52:48 +00:00
parent e40a511ee9
commit 530b7dd97f
Signed by: xnoe
GPG Key ID: 45AC398F44F0DAFE
1 changed files with 16 additions and 0 deletions
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16
src/main.rs
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@ -12,6 +12,8 @@ use std::collections::HashMap;
use std::io::Write; use std::io::Write;
use std::str;
fn create_dhcp_packet( fn create_dhcp_packet(
xid: u32, xid: u32,
mac: MacAddress, mac: MacAddress,
@ -92,10 +94,20 @@ fn dhcp_client(name: String, index: i32, mac: [u8; 6]) {
let mut socket = rawsocket::create_raw_socket(index, mac).unwrap(); let mut socket = rawsocket::create_raw_socket(index, mac).unwrap();
let client_mac = MacAddress::from_bytes(&mac).unwrap(); let client_mac = MacAddress::from_bytes(&mac).unwrap();
let client_id: Vec<u8> = vec![1].into_iter().chain(mac.to_vec().into_iter()).collect();
let mut client_addr: Option<Ipv4Addr> = None; let mut client_addr: Option<Ipv4Addr> = None;
let mut server_addr: Option<Ipv4Addr> = None; let mut server_addr: Option<Ipv4Addr> = None;
// Determine hostname.
let mut hostname_raw: [u8; 64] = [0; 64];
unsafe {
libc::gethostname(&mut hostname_raw as *mut _ as *mut libc::c_char, 64);
}
let length = hostname_raw.iter().position(|&i| i == 0).unwrap();
let hostname = str::from_utf8(&hostname_raw[..length]).unwrap_or("").to_owned();
println!("Hostname: {}", hostname);
// DHCP transaction loop // DHCP transaction loop
'dhcp_transaction: loop { 'dhcp_transaction: loop {
let xid: u32 = rng.gen(); let xid: u32 = rng.gen();
@ -115,6 +127,8 @@ fn dhcp_client(name: String, index: i32, mac: [u8; 6]) {
None, None,
vec![ vec![
DHCPOption::DHCPMessageType(DHCPMessageType::DHCPDiscover), DHCPOption::DHCPMessageType(DHCPMessageType::DHCPDiscover),
DHCPOption::HostName(hostname.clone()),
DHCPOption::ClientIdentifier(client_id.clone()),
DHCPOption::End, DHCPOption::End,
], ],
) )
@ -269,6 +283,8 @@ fn dhcp_client(name: String, index: i32, mac: [u8; 6]) {
DHCPOption::RequestIPAddress(client_addr.unwrap()), DHCPOption::RequestIPAddress(client_addr.unwrap()),
DHCPOption::ServerIdentifier(server_addr.unwrap()), DHCPOption::ServerIdentifier(server_addr.unwrap()),
DHCPOption::ParameterRequest(vec![1, 3, 6, 28, 121]), DHCPOption::ParameterRequest(vec![1, 3, 6, 28, 121]),
DHCPOption::HostName(hostname.clone()),
DHCPOption::ClientIdentifier(client_id.clone()),
DHCPOption::End, DHCPOption::End,
], ],
) )