use core::ffi::c_void;
use libc::{c_char, strlen, wchar_t, wcslen};
use memalloc::{allocate, deallocate};
use std::convert::TryFrom;
use std::convert::TryInto;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use windows::Win32::Foundation::{ERROR_BUFFER_OVERFLOW, NO_ERROR};
use windows::Win32::NetworkManagement::IpHelper::{
GetAdaptersAddresses, SendARP, AF_INET, AF_INET6, AF_UNSPEC, GAA_FLAG_INCLUDE_GATEWAYS,
IP_ADAPTER_ADDRESSES_LH,
};
use windows::Win32::Networking::WinSock::{SOCKADDR_IN, SOCKADDR_IN6};
use crate::gateway::Gateway;
use crate::interface::{Interface, InterfaceType, MacAddr};
use crate::ip::{Ipv4Net, Ipv6Net};
#[cfg(target_endian = "little")]
fn htonl(val: u32) -> u32 {
let o3 = (val >> 24) as u8;
let o2 = (val >> 16) as u8;
let o1 = (val >> 8) as u8;
let o0 = val as u8;
(o0 as u32) << 24 | (o1 as u32) << 16 | (o2 as u32) << 8 | (o3 as u32)
}
#[cfg(target_endian = "big")]
fn htonl(val: u32) -> u32 {
val
}
fn get_mac_through_arp(src_ip: Ipv4Addr, dst_ip: Ipv4Addr) -> MacAddr {
let src_ip_int: u32 = htonl(u32::from(src_ip));
let dst_ip_int: u32 = htonl(u32::from(dst_ip));
let mut out_buf_len: u32 = 6;
let mut target_mac_addr: [u8; 6] = [0; 6];
let res = unsafe {
SendARP(
dst_ip_int,
src_ip_int,
target_mac_addr.as_mut_ptr() as *mut c_void,
&mut out_buf_len,
)
};
if res == NO_ERROR.0 {
MacAddr::new(target_mac_addr)
} else {
MacAddr::zero()
}
}
pub fn interfaces() -> Vec<Interface> {
let mut interfaces: Vec<Interface> = vec![];
let mut dwsize: u32 = 2000;
let mut mem = unsafe { allocate(dwsize as usize) } as *mut IP_ADAPTER_ADDRESSES_LH;
let mut retries = 3;
let mut ret_val;
loop {
let old_size = dwsize as usize;
ret_val = unsafe {
GetAdaptersAddresses(
AF_UNSPEC,
GAA_FLAG_INCLUDE_GATEWAYS,
std::ptr::null_mut::<std::ffi::c_void>(),
mem,
&mut dwsize,
)
};
if ret_val != ERROR_BUFFER_OVERFLOW.0 || retries <= 0 {
break;
}
unsafe { deallocate(mem as *mut u8, old_size as usize) };
mem = unsafe { allocate(dwsize as usize) as *mut IP_ADAPTER_ADDRESSES_LH };
retries -= 1;
}
if ret_val == NO_ERROR.0 {
let mut cur = mem;
while !cur.is_null() {
let if_type: u32 = unsafe { (*cur).IfType };
match InterfaceType::try_from(if_type) {
Ok(_) => {}
Err(_) => {
cur = unsafe { (*cur).Next };
continue;
}
}
let anon1 = unsafe { (*cur).Anonymous1 };
let anon = unsafe { anon1.Anonymous };
let index = anon.IfIndex;
let anon2 = unsafe { (*cur).Anonymous2 };
let flags = unsafe { anon2.Flags };
let p_aname = unsafe { (*cur).AdapterName.0 };
let aname_len = unsafe { strlen(p_aname as *const c_char) };
let aname_slice = unsafe { std::slice::from_raw_parts(p_aname, aname_len) };
let adapter_name = String::from_utf8(aname_slice.to_vec()).unwrap();
let p_fname = unsafe { (*cur).FriendlyName.0 };
let fname_len = unsafe { wcslen(p_fname as *const wchar_t) };
let fname_slice = unsafe { std::slice::from_raw_parts(p_fname, fname_len) };
let friendly_name = String::from_utf16(fname_slice).unwrap();
let p_desc = unsafe { (*cur).Description.0 };
let desc_len = unsafe { wcslen(p_desc as *const wchar_t) };
let desc_slice = unsafe { std::slice::from_raw_parts(p_desc, desc_len) };
let description = String::from_utf16(desc_slice).unwrap();
let mac_addr_arr: [u8; 6] = unsafe { (*cur).PhysicalAddress }[..6]
.try_into()
.unwrap_or([0, 0, 0, 0, 0, 0]);
let mac_addr: MacAddr = MacAddr::new(mac_addr_arr);
let transmit_speed = unsafe { (*cur).TransmitLinkSpeed };
let receive_speed = unsafe { (*cur).ReceiveLinkSpeed };
let mut ipv4_vec: Vec<Ipv4Net> = vec![];
let mut ipv6_vec: Vec<Ipv6Net> = vec![];
let mut cur_a = unsafe { (*cur).FirstUnicastAddress };
while !cur_a.is_null() {
let addr = unsafe { (*cur_a).Address };
let prefix_len = unsafe { (*cur_a).OnLinkPrefixLength };
let sockaddr = unsafe { *addr.lpSockaddr };
if sockaddr.sa_family == AF_INET.0 as u16 {
let sockaddr: *mut SOCKADDR_IN = addr.lpSockaddr as *mut SOCKADDR_IN;
let a = unsafe { (*sockaddr).sin_addr.S_un.S_addr };
let ipv4 = if cfg!(target_endian = "little") {
Ipv4Addr::from(a.swap_bytes())
} else {
Ipv4Addr::from(a)
};
let ipv4_net: Ipv4Net = Ipv4Net::new(ipv4, prefix_len);
ipv4_vec.push(ipv4_net);
} else if sockaddr.sa_family == AF_INET6.0 as u16 {
let sockaddr: *mut SOCKADDR_IN6 = addr.lpSockaddr as *mut SOCKADDR_IN6;
let a = unsafe { (*sockaddr).sin6_addr.u.Byte };
let ipv6 = Ipv6Addr::from(a);
let ipv6_net: Ipv6Net = Ipv6Net::new(ipv6, prefix_len);
ipv6_vec.push(ipv6_net);
}
cur_a = unsafe { (*cur_a).Next };
}
let mut gateway_ips: Vec<Ipv4Addr> = vec![];
let mut cur_g = unsafe { (*cur).FirstGatewayAddress };
while !cur_g.is_null() {
let addr = unsafe { (*cur_g).Address };
let sockaddr = unsafe { *addr.lpSockaddr };
if sockaddr.sa_family == AF_INET.0 as u16 {
let sockaddr: *mut SOCKADDR_IN = addr.lpSockaddr as *mut SOCKADDR_IN;
let a = unsafe { (*sockaddr).sin_addr.S_un.S_addr };
let ipv4 = if cfg!(target_endian = "little") {
Ipv4Addr::from(a.swap_bytes())
} else {
Ipv4Addr::from(a)
};
gateway_ips.push(ipv4);
}
cur_g = unsafe { (*cur_g).Next };
}
let default_gateway: Option<Gateway> = match gateway_ips.get(0) {
Some(gateway_ip) => {
if let Some(ip_net) = ipv4_vec.get(0) {
let mac_addr = get_mac_through_arp(ip_net.addr, *gateway_ip);
let gateway = Gateway {
mac_addr: mac_addr,
ip_addr: IpAddr::V4(*gateway_ip),
};
Some(gateway)
} else {
None
}
}
None => None,
};
let interface: Interface = Interface {
index: index,
name: adapter_name,
friendly_name: Some(friendly_name),
description: Some(description),
if_type: InterfaceType::try_from(if_type).unwrap_or(InterfaceType::Unknown),
mac_addr: Some(mac_addr),
ipv4: ipv4_vec,
ipv6: ipv6_vec,
flags: flags,
transmit_speed: Some(transmit_speed),
receive_speed: Some(receive_speed),
gateway: default_gateway,
};
interfaces.push(interface);
cur = unsafe { (*cur).Next };
}
} else {
unsafe {
deallocate(mem as *mut u8, dwsize as usize);
}
}
unsafe {
deallocate(mem as *mut u8, dwsize as usize);
}
return interfaces;
}