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// Take a look at the license at the top of the repository in the LICENSE file.
use std::collections::{HashMap, hash_map};
use std::ffi::{OsString, c_char};
use std::mem::{MaybeUninit, size_of};
use std::os::unix::ffi::OsStringExt;
use std::ptr::null_mut;
use libc::{
CTL_NET, IFDATA_GENERAL, IFF_RUNNING, IFF_UP, IFMIB_IFDATA, IFNAMSIZ, NET_RT_IFLIST2,
NETLINK_GENERIC, PF_LINK, PF_ROUTE, RTM_IFINFO2, if_data64, if_indextoname, if_msghdr,
if_msghdr2, ifmibdata, strlen, sysctl,
};
use crate::{InterfaceOperationalState, MacAddr, NetworkData, NetworkDataInner};
#[allow(clippy::cast_ptr_alignment)]
#[allow(clippy::uninit_vec)]
#[allow(clippy::needless_late_init)]
pub(crate) fn update_networks(interfaces: &mut HashMap<OsString, NetworkData>) {
let mib = &mut [CTL_NET, PF_ROUTE, 0, 0, NET_RT_IFLIST2, 0];
let mib2 = &mut [
CTL_NET,
PF_LINK,
NETLINK_GENERIC,
IFMIB_IFDATA,
0,
IFDATA_GENERAL,
];
let mut len = 0;
unsafe {
if sysctl(
mib.as_mut_ptr(),
mib.len() as _,
null_mut(),
&mut len,
null_mut(),
0,
) < 0
{
// TODO: might be nice to put an error in here...
return;
}
let mut buf = Vec::with_capacity(len);
buf.set_len(len);
if sysctl(
mib.as_mut_ptr(),
mib.len() as _,
buf.as_mut_ptr(),
&mut len,
null_mut(),
0,
) < 0
{
// TODO: might be nice to put an error in here...
return;
}
let buf = buf.as_ptr() as *const c_char;
let lim = buf.add(len);
let mut next = buf;
while next < lim {
let ifm = next as *const if_msghdr;
next = next.offset((*ifm).ifm_msglen as isize);
if (*ifm).ifm_type == RTM_IFINFO2 as u8 {
// The interface (line description) name stored at ifname will be returned in
// the default coded character set identifier (CCSID) currently in effect for
// the job. If this is not a single byte CCSID, then storage greater than
// IFNAMSIZ (16) bytes may be needed. 22 bytes is large enough for all CCSIDs.
let mut name = vec![0u8; IFNAMSIZ + 6];
let if2m: *const if_msghdr2 = ifm as *const if_msghdr2;
let pname = if_indextoname((*if2m).ifm_index as _, name.as_mut_ptr() as _);
if pname.is_null() {
continue;
}
name.set_len(strlen(pname));
let name = OsString::from_vec(name);
let mtu = (*if2m).ifm_data.ifi_mtu as u64;
let baudrate = (*if2m).ifm_data.ifi_baudrate;
let link_speed = if baudrate != 0 { Some(baudrate) } else { None };
// FIXME: the documentation I could find was rather spars and unclear, are these the right flags?
let operational_state = InterfaceOperationalState::from_flags((*if2m).ifm_flags);
// Because data size is capped at 32 bits with the previous sysctl call for some
// reasons, we need to make another sysctl call to get the actual values
// we originally got into `ifm.ifm_data`...
//
// Issue: https://github.com/GuillaumeGomez/sysinfo/issues/1378
let mut mib_data: MaybeUninit<ifmibdata> = MaybeUninit::uninit();
mib2[4] = (*if2m).ifm_index as _;
let ret = sysctl(
mib2.as_mut_ptr(),
mib2.len() as _,
mib_data.as_mut_ptr() as *mut _,
&mut size_of::<ifmibdata>(),
null_mut(),
0,
);
match interfaces.entry(name) {
hash_map::Entry::Occupied(mut e) => {
let interface = e.get_mut();
let interface = &mut interface.inner;
if ret < 0 {
sysinfo_debug!(
"Cannot get network interface data usage: sysctl failed: {ret}"
);
} else {
let data = mib_data.assume_init();
update_network_data(interface, &data.ifmd_data);
}
interface.mtu = mtu;
interface.operational_state = operational_state;
interface.updated = true;
interface.link_speed = link_speed;
}
hash_map::Entry::Vacant(e) => {
let current_in;
let current_out;
let packets_in;
let packets_out;
let errors_in;
let errors_out;
if ret < 0 {
sysinfo_debug!(
"Cannot get network interface data usage: sysctl failed: {ret}"
);
current_in = 0;
current_out = 0;
packets_in = 0;
packets_out = 0;
errors_in = 0;
errors_out = 0;
} else {
let data = mib_data.assume_init();
let data = data.ifmd_data;
current_in = data.ifi_ibytes;
current_out = data.ifi_obytes;
packets_in = data.ifi_ipackets;
packets_out = data.ifi_opackets;
errors_in = data.ifi_ierrors;
errors_out = data.ifi_oerrors;
}
e.insert(NetworkData {
inner: NetworkDataInner {
current_in,
old_in: current_in,
current_out,
old_out: current_out,
packets_in,
old_packets_in: packets_in,
packets_out,
old_packets_out: packets_out,
errors_in,
old_errors_in: errors_in,
errors_out,
old_errors_out: errors_out,
updated: true,
mac_addr: MacAddr::UNSPECIFIED,
ip_networks: vec![],
mtu,
link_speed,
operational_state,
},
});
}
}
}
}
}
}
#[inline]
fn update_field(old_field: &mut u64, new_field: &mut u64, value: u64) {
*old_field = *new_field;
*new_field = value;
}
fn update_network_data(inner: &mut NetworkDataInner, data: &if_data64) {
update_field(&mut inner.old_out, &mut inner.current_out, data.ifi_obytes);
update_field(&mut inner.old_in, &mut inner.current_in, data.ifi_ibytes);
update_field(
&mut inner.old_packets_out,
&mut inner.packets_out,
data.ifi_opackets,
);
update_field(
&mut inner.old_packets_in,
&mut inner.packets_in,
data.ifi_ipackets,
);
update_field(
&mut inner.old_errors_in,
&mut inner.errors_in,
data.ifi_ierrors,
);
update_field(
&mut inner.old_errors_out,
&mut inner.errors_out,
data.ifi_oerrors,
);
}
impl InterfaceOperationalState {
fn from_flags(flags: core::ffi::c_int) -> Self {
// based on the bsd version in src\unix\bsd\network_common.rs
if (flags & IFF_RUNNING) != 0 {
if (flags & IFF_UP) != 0 {
InterfaceOperationalState::Up
} else {
InterfaceOperationalState::Dormant
}
} else {
InterfaceOperationalState::Down
}
}
}