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use std::collections::HashSet;
use anyhow::{Context, Result};
use iptables;
use log::*;
use regex::Regex;
use crate::messages;
pub fn setup(ipt: &iptables::IPTables) -> Result<()> {
// ensure we start from a clean state without any rule already set
cleanup(ipt)?;
info!("{}: creating DIPLONAT chain", ipt.cmd);
ipt.new_chain("filter", "DIPLONAT")
.context("Failed to create new chain")?;
ipt.insert_unique("filter", "INPUT", "-j DIPLONAT", 1)
.context("Failed to insert jump rule")?;
Ok(())
}
pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<()> {
for p in ports.tcp_ports {
info!("{}: opening TCP port {}", ipt.cmd, p);
ipt.append(
"filter",
"DIPLONAT",
&format!("-p tcp --dport {} -j ACCEPT", p),
)
.context("Failed to insert port rule")?;
}
for p in ports.udp_ports {
info!("{}: opening UDP port {}", ipt.cmd, p);
ipt.append(
"filter",
"DIPLONAT",
&format!("-p udp --dport {} -j ACCEPT", p),
)
.context("Failed to insert port rule")?;
}
Ok(())
}
pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts> {
let mut ports = messages::PublicExposedPorts {
tcp_ports: HashSet::new(),
udp_ports: HashSet::new(),
};
let list = ipt.list("filter", "DIPLONAT")?;
let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT")
.context("Regex matching open ports encountered an unexpected rule")?;
for i in list {
let caps = re.captures(&i);
match caps {
Some(c) => {
if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
let proto = String::from(raw_proto.as_str());
let number = String::from(raw_port.as_str()).parse::<u16>()?;
if proto == "tcp" {
ports.tcp_ports.insert(number);
} else {
ports.udp_ports.insert(number);
}
} else {
error!("Unexpected rule found in DIPLONAT chain")
}
}
_ => {}
}
}
Ok(ports)
}
pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
if ipt.chain_exists("filter", "DIPLONAT")? {
info!("{}: removing old DIPLONAT chain", ipt.cmd);
ipt.flush_chain("filter", "DIPLONAT")
.context("Failed to flush the DIPLONAT chain")?;
if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
ipt.delete("filter", "INPUT", "-j DIPLONAT")
.context("Failed to delete jump rule")?;
}
ipt.delete_chain("filter", "DIPLONAT")
.context("Failed to delete chain")?;
}
Ok(())
}
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