From 93f0b278f9a60c90a708629a2cee42b6207e4fc9 Mon Sep 17 00:00:00 2001 From: heinrich5991 Date: Thu, 29 Dec 2022 12:50:24 +0100 Subject: [PATCH] Add tool to manually ping the mastersrv Usage example: `masterping ipv6 https://master1.ddnet.org/ddnet/15/register`. Returns 0 on success, nonzero on failure. Note that this might report failure occasionally as it doesn't retry, UDP packets are non-reliable so they might not arrive even though the mastersrv is up. --- src/masterping/Cargo.lock | 516 +++++++++++++++++++++++++++++++++++++ src/masterping/Cargo.toml | 18 ++ src/masterping/src/main.rs | 142 ++++++++++ 3 files changed, 676 insertions(+) create mode 100644 src/masterping/Cargo.lock create mode 100644 src/masterping/Cargo.toml create mode 100644 src/masterping/src/main.rs diff --git a/src/masterping/Cargo.lock b/src/masterping/Cargo.lock new file mode 100644 index 000000000..69bc6423c --- /dev/null +++ b/src/masterping/Cargo.lock @@ -0,0 +1,516 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 3 + +[[package]] +name = "addr2line" +version = "0.19.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97" +dependencies = [ + "gimli", +] + 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= false +license = "Zlib" + +[workspace] + +[dependencies] +anyhow = { version = "1.0.66", features = ["backtrace"] } +clap = { version = "2.34.0", default-features = false, features = [ + "suggestions", + "wrap_help", +] } +ureq = "2.5.0" +uuid = { version = "1.2.2", features = ["v4"] } diff --git a/src/masterping/src/main.rs b/src/masterping/src/main.rs new file mode 100644 index 000000000..b52c58a5c --- /dev/null +++ b/src/masterping/src/main.rs @@ -0,0 +1,142 @@ +use anyhow::bail; +use anyhow::Context; +use clap::value_t_or_exit; +use clap::App; +use clap::Arg; +use std::io; +use std::net::SocketAddr; +use std::net::ToSocketAddrs; +use std::net::UdpSocket; +use std::str::FromStr; +use std::time::Duration; +use std::time::Instant; +use uuid::Uuid; + +use self::IpVersion::*; + +#[derive(Clone, Copy)] +enum IpVersion { + Ipv4, + Ipv6, +} + +struct InvalidIpVersion; + +impl FromStr for IpVersion { + type Err = InvalidIpVersion; + fn from_str(s: &str) -> Result { + Ok(match s { + "ipv4" => Ipv4, + "ipv6" => Ipv6, + _ => return Err(InvalidIpVersion), + }) + } +} + +struct IpvResolver(IpVersion); + +impl ureq::Resolver for IpvResolver { + fn resolve(&self, netloc: &str) -> io::Result> { + ToSocketAddrs::to_socket_addrs(netloc).map(|iter| { + iter.filter(|s| match self.0 { + Ipv4 => s.is_ipv4(), + Ipv6 => s.is_ipv6(), + }) + .collect() + }) + } +} + +fn main() -> anyhow::Result<()> { + let matches = App::new("masterping") + .about("Continuously checks if the masterserver is accepting registrations.") + .arg(Arg::with_name("ipv") + .value_name("IPV") + .required(true) + .help("IP version (either \"ipv6\" or \"ipv4\").") + ) + .arg(Arg::with_name("masterurl") + .value_name("MASTERURL") + .required(true) + .help("URL of the masterserver registration endpoint (something like \"https://master1.ddnet.org/ddnet/15/register\")") + ) + .get_matches(); + + let ipv = value_t_or_exit!(matches.value_of("ipv"), IpVersion); + let url = matches.value_of("masterurl").unwrap(); + + let bindaddr = match ipv { + Ipv4 => "0.0.0.0:0", + Ipv6 => "[::]:0", + }; + let udp = UdpSocket::bind(bindaddr).context("UdpSocket::bind")?; + let address = format!( + "tw-0.6+udp://connecting-address.invalid:{}", + udp.local_addr().context("UdpSocket::local_addr")?.port() + ); + let challenge_secret = Uuid::new_v4().to_string(); + + let agent = ureq::builder() + .user_agent("masterping/0.0.1") + .resolver(IpvResolver(ipv)) + .build(); + let response = agent + .post(url) + .set("Address", &address) + .set("Secret", &Uuid::new_v4().to_string()) + .set("Challenge-Secret", &challenge_secret) + .set("Info-Serial", "0") + .send_bytes(b"") + .map_err(|e| { + if let ureq::Error::Status(status, response) = e { + let status_text = response.status_text().to_owned(); + if let Ok(response) = response.into_string() { + eprintln!("{}", response); + } + ureq::Error::Status( + status, + ureq::Response::new(status, &status_text, "").unwrap(), + ) + } else { + e + } + })? + .into_string()?; + + if response != "{\"status\":\"need_challenge\"}\n" { + bail!("Unexpected response {:?}", response); + } + + let expected_msg_prefix = { + let mut expected = Vec::new(); + expected.extend_from_slice(b"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xffchal"); + expected.extend_from_slice(challenge_secret.as_bytes()); + expected.push(0); + expected + }; + + let mut buf = [0; 65536]; + let deadline = Instant::now() + Duration::from_secs(3); + udp.set_read_timeout(Some(Duration::from_secs(3))) + .context("UdpSocket::set_read_timeout")?; + loop { + let (read, from) = udp + .recv_from(&mut buf) + .context("couldn't receive ping from mastersrv in time")?; + let message = &buf[..read]; + if message.starts_with(&expected_msg_prefix) { + println!("{}", from); + break; + } + let mut duration = deadline + .checked_duration_since(Instant::now()) + .unwrap_or_default(); + if duration == Duration::ZERO { + duration = Duration::from_nanos(1); + } + udp.set_read_timeout(Some(duration)) + .context("UdpSocket::set_read_timeout")?; + } + + Ok(()) +}