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use iptables;
use regex::Regex;
use std::collections::HashSet;
use std::io;
#[derive(PartialEq,Eq,Debug,Hash)]
pub struct Port {
proto: String,
number: u16,
}
#[derive(Debug)]
pub struct FirewallError(String);
impl From<iptables::error::IPTError> for FirewallError {
fn from(error: iptables::error::IPTError) -> Self {
FirewallError(error.to_string())
}
}
pub fn setup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {
ipt.new_chain("filter", "DIPLONAT")?;
ipt.insert("filter", "INPUT", "-j DIPLONAT", 1)?;
Ok(())
}
pub fn open_ports(ipt: &iptables::IPTables, ports: Vec<Port>) -> Result<(), FirewallError> {
for p in ports {
ipt.append("filter", "DIPLONAT", &format!("-p {} --dport {} -j ACCEPT", p.proto, p.number))?;
}
Ok(())
}
pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<HashSet<Port>, FirewallError> {
let mut opened_ports: HashSet<Port> = HashSet::new();
let list = ipt.list("filter", "DIPLONAT")?;
let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").unwrap();
for i in list {
let caps = re.captures(&i);
match caps {
Some(c) => {
let raw_proto = c.get(1).unwrap();
let raw_port = c.get(2).unwrap();
let proto = String::from(raw_proto.as_str());
let number = String::from(raw_port.as_str()).parse::<u16>().unwrap();
opened_ports.insert( Port { proto, number } );
},
_ => {}
}
}
Ok(opened_ports)
}
pub fn cleanup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {
ipt.flush_chain("filter", "DIPLONAT")?;
ipt.delete("filter", "INPUT", "-j DIPLONAT")?;
ipt.delete_chain("filter", "DIPLONAT")?;
Ok(())
}
/*
fn main() {
let ipt = iptables::new(false).unwrap();
setup(&ipt);
let mut test: HashSet<Port> = HashSet::new();
test.insert(Port { proto: String::from("tcp"), number: 443 });
let a = get_opened_ports(&ipt);
let l = test.difference(&a).collect::<Vec<&Port>>();
println!("{:?}", l);
}
*/
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