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use std::{ffi::OsStr, net::IpAddr, process::Command, sync::OnceLock};
use regex::Regex;
use crate::{
mt_log,
network::{LocalSocket, Protocol},
};
#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct RawConnection {
remote_ip: String,
local_ip: String,
local_port: String,
remote_port: String,
protocol: String,
pub process_name: String,
}
static CONNECTION_REGEX_ONCE: OnceLock<Regex> = OnceLock::new();
static LISTEN_REGEX: OnceLock<Regex> = OnceLock::new();
fn get_null_addr(ip_type: &str) -> &str {
if ip_type.contains('4') {
"0.0.0.0"
} else {
"::0"
}
}
impl RawConnection {
pub fn new(raw_line: &str) -> Option<RawConnection> {
let connection_regex = CONNECTION_REGEX_ONCE
.get_or_init(|| Regex::new(r"\[?([^\s\]]*)\]?:(\d+)->\[?([^\s\]]*)\]?:(\d+)").unwrap());
let listen_regex =
LISTEN_REGEX.get_or_init(|| Regex::new(r"\[?([^\s\[\]]*)\]?:(.*)").unwrap());
// Example row
// com.apple 664 user 198u IPv4 0xeb179a6650592b8d 0t0 TCP 192.168.1.187:58535->1.2.3.4:443 (ESTABLISHED)
let columns: Vec<&str> = raw_line.split_ascii_whitespace().collect();
if columns.len() < 9 {
return None;
}
let process_name = columns[0].replace("\\x20", " ");
// Unneeded
// let pid = columns[1];
// let username = columns[2];
// let fd = columns[3];
// IPv4 or IPv6
let ip_type = columns[4];
// let device = columns[5];
// let size = columns[6];
// UDP/TCP
let protocol = columns[7].to_ascii_uppercase();
if protocol != "TCP" && protocol != "UDP" {
return None;
}
let connection_str = columns[8];
// "(LISTEN)" or "(ESTABLISHED)", this column may or may not be present
// let connection_state = columns[9];
// If this socket is in a "connected" state
if let Some(caps) = connection_regex.captures(connection_str) {
// Example
// 192.168.1.187:64230->0.1.2.3:5228
// *:*
// *:4567
let local_ip = String::from(caps.get(1).unwrap().as_str());
let local_port = String::from(caps.get(2).unwrap().as_str());
let remote_ip = String::from(caps.get(3).unwrap().as_str());
let remote_port = String::from(caps.get(4).unwrap().as_str());
let connection = RawConnection {
local_ip,
local_port,
remote_ip,
remote_port,
protocol,
process_name,
};
Some(connection)
} else if let Some(caps) = listen_regex.captures(connection_str) {
let local_ip = if caps.get(1).unwrap().as_str() == "*" {
get_null_addr(ip_type)
} else {
caps.get(1).unwrap().as_str()
};
let local_ip = String::from(local_ip);
let local_port = String::from(if caps.get(2).unwrap().as_str() == "*" {
"0"
} else {
caps.get(2).unwrap().as_str()
});
let remote_ip = String::from(get_null_addr(ip_type));
let remote_port = String::from("0");
let connection = RawConnection {
local_ip,
local_port,
remote_ip,
remote_port,
protocol,
process_name,
};
Some(connection)
} else {
None
}
}
pub fn get_protocol(&self) -> Option<Protocol> {
Protocol::from_str(&self.protocol)
}
pub fn get_local_ip(&self) -> Option<IpAddr> {
self.local_ip.parse().ok()
}
pub fn get_local_port(&self) -> Option<u16> {
self.local_port.parse::<u16>().ok()
}
pub fn as_local_socket(&self) -> Option<LocalSocket> {
let process = &self.process_name;
let Some(ip) = self.get_local_ip() else {
mt_log!(
warn,
r#"Failed to get the local IP of a connection belonging to "{process}"."#
);
return None;
};
let Some(port) = self.get_local_port() else {
mt_log!(
warn,
r#"Failed to get the local port of a connection belonging to "{process}"."#
);
return None;
};
let Some(protocol) = self.get_protocol() else {
mt_log!(
warn,
r#"Failed to get the protocol of a connection belonging to "{process}"."#
);
return None;
};
Some(LocalSocket { ip, port, protocol })
}
}
pub fn get_connections() -> RawConnections {
let content = run(["-n", "-P", "-i4", "-i6", "+c", "0"]);
RawConnections::new(content)
}
fn run<I, S>(args: I) -> String
where
I: IntoIterator<Item = S>,
S: AsRef<OsStr>,
{
let output = Command::new("lsof")
.args(args)
.output()
.expect("failed to execute process");
String::from_utf8_lossy(&output.stdout).into_owned()
}
pub struct RawConnections {
content: Vec<RawConnection>,
}
impl RawConnections {
pub fn new(content: String) -> RawConnections {
let lines: Vec<RawConnection> = content.lines().flat_map(RawConnection::new).collect();
RawConnections { content: lines }
}
}
impl Iterator for RawConnections {
type Item = RawConnection;
fn next(&mut self) -> Option<Self::Item> {
self.content.pop()
}
}
#[cfg(test)]
mod tests {
use super::*;
const IPV6_LINE_RAW_OUTPUT: &str = "ProcessName 29266 user 9u IPv6 0x5d53dfe5445cee01 0t0 UDP [fe80:4::aede:48ff:fe00:1122]:1111->[fe80:4::aede:48ff:fe33:4455]:2222";
const LINE_RAW_OUTPUT: &str = "ProcessName 29266 user 39u IPv4 0x28ffb9c0021196bf 0t0 UDP 192.168.0.1:1111->198.252.206.25:2222";
const FULL_RAW_OUTPUT: &str = r#"
com.apple 590 etoledom 193u IPv4 0x28ffb9c041115627 0t0 TCP 192.168.1.37:60298->31.13.83.36:443 (ESTABLISHED)
com.apple 590 etoledom 198u IPv4 0x28ffb9c04110ea8f 0t0 TCP 192.168.1.37:60299->31.13.83.8:443 (ESTABLISHED)
com.apple 590 etoledom 203u IPv4 0x28ffb9c04110ea8f 0t0 TCP 192.168.1.37:60299->31.13.83.8:443 (ESTABLISHED)
com.apple 590 etoledom 204u IPv4 0x28ffb9c04111253f 0t0 TCP 192.168.1.37:60374->140.82.114.26:443
"#;
#[test]
fn test_iterator_multiline() {
let iterator = RawConnections::new(String::from(FULL_RAW_OUTPUT));
let connections: Vec<RawConnection> = iterator.collect();
assert_eq!(connections.len(), 4);
}
#[test]
fn test_raw_connection_is_created_from_raw_output_ipv4() {
test_raw_connection_is_created_from_raw_output(LINE_RAW_OUTPUT);
}
#[test]
fn test_raw_connection_is_created_from_raw_output_ipv6() {
test_raw_connection_is_created_from_raw_output(IPV6_LINE_RAW_OUTPUT);
}
fn test_raw_connection_is_created_from_raw_output(raw_output: &str) {
let connection = RawConnection::new(raw_output);
assert!(connection.is_some());
}
#[test]
fn test_raw_connection_is_not_created_from_wrong_raw_output() {
let connection = RawConnection::new("not a process");
assert!(connection.is_none());
}
#[test]
fn test_raw_connection_parse_local_port_ipv4() {
test_raw_connection_parse_local_port(LINE_RAW_OUTPUT);
}
#[test]
fn test_raw_connection_parse_local_port_ipv6() {
test_raw_connection_parse_local_port(IPV6_LINE_RAW_OUTPUT);
}
fn test_raw_connection_parse_local_port(raw_output: &str) {
let connection = RawConnection::new(raw_output).unwrap();
assert_eq!(connection.get_local_port(), Some(1111));
}
#[test]
fn test_raw_connection_parse_protocol_ipv4() {
test_raw_connection_parse_protocol(LINE_RAW_OUTPUT);
}
#[test]
fn test_raw_connection_parse_protocol_ipv6() {
test_raw_connection_parse_protocol(IPV6_LINE_RAW_OUTPUT);
}
fn test_raw_connection_parse_protocol(raw_line: &str) {
let connection = RawConnection::new(raw_line).unwrap();
assert_eq!(connection.get_protocol(), Some(Protocol::Udp));
}
#[test]
fn test_raw_connection_parse_process_name_ipv4() {
test_raw_connection_parse_process_name(LINE_RAW_OUTPUT);
}
#[test]
fn test_raw_connection_parse_process_name_ipv6() {
test_raw_connection_parse_process_name(IPV6_LINE_RAW_OUTPUT);
}
fn test_raw_connection_parse_process_name(raw_line: &str) {
let connection = RawConnection::new(raw_line).unwrap();
assert_eq!(connection.process_name, String::from("ProcessName"));
}
}
|
