commit b3d6a5352e21ef82717061af8a5646c3c8b9a00a
Author: chuan <pchuan98@qq.com>
Date:   Tue Jun 23 19:29:34 2026 +0800

    feat: init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5ac450c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
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+/target/
+
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\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a718ab3
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..04a51ea
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "fast-xray"
+version = "0.1.0"
+edition = "2024"
+rust-version = "1.85"
+description = "Fast Cloudflare IP optimizer for CDN-fronted Xray/VLESS nodes."
+
+[dependencies]
+anyhow = "1"
+clap = { version = "4", features = ["derive"] }
+console = "0.15"
+futures = "0.3"
+indicatif = "0.17"
+ipnet = "2"
+rand = "0.8"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls"] }
+tokio = { version = "1", features = ["macros", "net", "rt-multi-thread", "time"] }
+
+[profile.release]
+opt-level = 3
+lto = "thin"
+codegen-units = 1
+strip = true
diff --git a/src/cloudflare.rs b/src/cloudflare.rs
new file mode 100644
index 0000000..eeef481
--- /dev/null
+++ b/src/cloudflare.rs
@@ -0,0 +1,118 @@
+//! Fetch Cloudflare's published CDN IP ranges from the web.
+//!
+//! Cloudflare publishes its anycast ranges as plain-text CIDR lists, one per
+//! line. This module fetches them and returns parsed, typed CIDR lists for
+//! other stages (sampling, probing) to consume. It does not write files or
+//! shell out.
+
+use anyhow::{Context, Result};
+use ipnet::{IpNet, Ipv4Net, Ipv6Net};
+
+pub const CF_IPV4_URL: &str = "https://www.cloudflare.com/ips-v4";
+pub const CF_IPV6_URL: &str = "https://www.cloudflare.com/ips-v6";
+
+const USER_AGENT: &str = "cfopt/0.1";
+
+/// Which address families to fetch.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+#[allow(dead_code)] // V4 / V6 reserved for a future --family CLI flag.
+pub enum Family {
+    V4,
+    V6,
+    Both,
+}
+
+/// Parsed Cloudflare CDN ranges, split by address family.
+#[derive(Clone, Debug, Default)]
+pub struct CfRanges {
+    pub v4: Vec<Ipv4Net>,
+    pub v6: Vec<Ipv6Net>,
+}
+
+impl CfRanges {
+    #[allow(dead_code)] // paired with len(); used by later stages.
+    pub fn is_empty(&self) -> bool {
+        self.v4.is_empty() && self.v6.is_empty()
+    }
+
+    #[allow(dead_code)] // used by later stages.
+    pub fn len(&self) -> usize {
+        self.v4.len() + self.v6.len()
+    }
+}
+
+/// Fetch Cloudflare ranges for the requested family and return them parsed.
+pub async fn fetch_ranges(family: Family) -> Result<CfRanges> {
+    let client = reqwest::Client::builder()
+        .user_agent(USER_AGENT)
+        .timeout(std::time::Duration::from_secs(15))
+        .build()
+        .context("build http client")?;
+
+    let mut ranges = CfRanges::default();
+    if matches!(family, Family::V4 | Family::Both) {
+        let text = fetch_text(&client, CF_IPV4_URL).await?;
+        ranges.v4 = parse_v4_lines(&text);
+    }
+    if matches!(family, Family::V6 | Family::Both) {
+        let text = fetch_text(&client, CF_IPV6_URL).await?;
+        ranges.v6 = parse_v6_lines(&text);
+    }
+    Ok(ranges)
+}
+
+async fn fetch_text(client: &reqwest::Client, url: &str) -> Result<String> {
+    client
+        .get(url)
+        .send()
+        .await
+        .with_context(|| format!("request {url}"))?
+        .error_for_status()
+        .with_context(|| format!("bad status from {url}"))?
+        .text()
+        .await
+        .with_context(|| format!("read body from {url}"))
+}
+
+/// Parse a plain-text CIDR list, keeping only IPv4 networks.
+pub fn parse_v4_lines(text: &str) -> Vec<Ipv4Net> {
+    parse_cidr_lines(text)
+        .into_iter()
+        .filter_map(|net| match net {
+            IpNet::V4(v4) => Some(v4),
+            IpNet::V6(_) => None,
+        })
+        .collect()
+}
+
+/// Parse a plain-text CIDR list, keeping only IPv6 networks.
+pub fn parse_v6_lines(text: &str) -> Vec<Ipv6Net> {
+    parse_cidr_lines(text)
+        .into_iter()
+        .filter_map(|net| match net {
+            IpNet::V6(v6) => Some(v6),
+            IpNet::V4(_) => None,
+        })
+        .collect()
+}
+
+/// Parse a plain-text CIDR list, skipping blanks and anything unparseable.
+fn parse_cidr_lines(text: &str) -> Vec<IpNet> {
+    text.lines()
+        .filter_map(|line| line.split_whitespace().next())
+        .filter_map(|token| token.parse::<IpNet>().ok())
+        .collect()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn splits_v4_and_v6() {
+        let text = "173.245.48.0/20\n# comment\n\n103.21.244.0/22  trailing\n2400:cb00::/32\n";
+        assert_eq!(parse_v4_lines(text).len(), 2);
+        assert_eq!(parse_v6_lines(text).len(), 1);
+        assert_eq!(parse_v4_lines(text)[0].to_string(), "173.245.48.0/20");
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..078bb38
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,188 @@
+//! cfopt — Cloudflare IP optimizer for CDN-fronted VLESS nodes.
+//!
+//! Subcommands mirror the optimization pipeline. Implemented so far:
+//!   ping — collect the fastest reachable Cloudflare IPs over TCP.
+
+mod cloudflare;
+mod ping;
+
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+
+use anyhow::{Context, Result};
+use clap::{Args, Parser, Subcommand};
+use console::style;
+use indicatif::{ProgressBar, ProgressStyle};
+
+use cloudflare::Family;
+use ping::{PingResult, Progress};
+
+#[derive(Parser)]
+#[command(name = "fast-xray", about = "Fast Cloudflare IP optimizer for CDN-fronted Xray/VLESS nodes.")]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    /// Probe Cloudflare IPs over TCP 443 and collect the fastest reachable ones.
+    Ping(PingArgs),
+}
+
+#[derive(Args)]
+struct PingArgs {
+    /// Target number of valid (reachable) IPs to collect.
+    #[arg(short = 'n', long, default_value_t = 50)]
+    count: usize,
+
+    /// TCP connect timeout in seconds; slower than this counts as unreachable.
+    #[arg(short = 't', long, default_value_t = 3.0)]
+    timeout: f64,
+
+    /// Concurrent probes.
+    #[arg(short = 'c', long, default_value_t = 100)]
+    concurrency: usize,
+
+    /// Also test IPv6 ranges (off by default).
+    #[arg(short = '6', long = "ipv6")]
+    ipv6: bool,
+
+    /// TCP port to probe.
+    #[arg(short = 'p', long, default_value_t = 443)]
+    port: u16,
+
+    /// Random IPs sampled per segment in the availability pre-scan.
+    #[arg(long, default_value_t = 5)]
+    probe_sample: usize,
+
+    /// Safety cap: stop after probing this many IPs. Defaults to count * 100.
+    #[arg(long)]
+    max_probe: Option<usize>,
+
+    /// Write the resulting IPs (one per line, fastest first) to this file.
+    #[arg(short = 'o', long, default_value = "result/ip.txt")]
+    output: PathBuf,
+
+    /// Print the full result table (IP + latency) at the end.
+    #[arg(short = 'v', long)]
+    verbose: bool,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let cli = Cli::parse();
+    match cli.command {
+        Command::Ping(args) => run_ping(args).await,
+    }
+}
+
+async fn run_ping(args: PingArgs) -> Result<()> {
+    let family = if args.ipv6 { Family::Both } else { Family::V4 };
+
+    let spinner = ProgressBar::new_spinner();
+    spinner.enable_steady_tick(Duration::from_millis(90));
+    spinner.set_message("Fetching Cloudflare ranges…");
+    let ranges = cloudflare::fetch_ranges(family).await?;
+    spinner.finish_with_message(format!(
+        "{} Cloudflare ranges: {} v4, {} v6",
+        style("✓").green().bold(),
+        ranges.v4.len(),
+        ranges.v6.len()
+    ));
+
+    let cfg = ping::PingConfig {
+        count: args.count,
+        timeout: Duration::from_secs_f64(args.timeout),
+        concurrency: args.concurrency.max(1),
+        ipv6: args.ipv6,
+        port: args.port,
+        probe_sample: args.probe_sample,
+        max_probe: args.max_probe.unwrap_or(args.count.saturating_mul(100)),
+    };
+
+    let bar = ProgressBar::new(cfg.count as u64);
+    bar.set_style(
+        ProgressStyle::with_template(
+            "{spinner:.cyan} [{bar:32.green/dim}] {pos}/{len} valid  {msg}",
+        )
+        .unwrap()
+        .progress_chars("=>-"),
+    );
+    bar.enable_steady_tick(Duration::from_millis(90));
+
+    let target = cfg.count;
+    let results = ping::run(&ranges, &cfg, |progress| match progress {
+        Progress::Probing { ip, ok, valid, probed } => {
+            bar.set_position(valid.min(target) as u64);
+            let mark = if ok { style("✓").green() } else { style("·").dim() };
+            bar.set_message(format!("probed {probed}  {mark} {ip}"));
+        }
+        Progress::PreScan { live, segments, valid } => {
+            bar.println(format!(
+                "  pre-scan: {} live / {} segments, {} already valid",
+                style(live).cyan(),
+                segments,
+                style(valid).green(),
+            ));
+            bar.set_position(valid.min(target) as u64);
+        }
+    })
+    .await?;
+    bar.finish_and_clear();
+
+    if results.is_empty() {
+        eprintln!("{} no reachable IP found", style("✗").red().bold());
+        return Ok(());
+    }
+
+    if args.verbose {
+        print_table(&results);
+    }
+    write_output(&results, &args.output)?;
+    Ok(())
+}
+
+/// Pretty, colored result table on stderr (human-facing).
+fn print_table(results: &[PingResult]) {
+    eprintln!();
+    eprintln!(
+        "{}",
+        style(format!("  Fastest {} IPs", results.len())).bold().underlined()
+    );
+    eprintln!("  {:>3}  {:<39}  {:>9}", "#", "IP", "Latency");
+    for (i, r) in results.iter().enumerate() {
+        let ms = r.latency.as_secs_f64() * 1000.0;
+        let latency = format!("{ms:>6.1} ms");
+        let colored = if ms < 150.0 {
+            style(latency).green()
+        } else if ms < 250.0 {
+            style(latency).yellow()
+        } else {
+            style(latency).red()
+        };
+        eprintln!("  {:>3}  {:<39}  {}", i + 1, r.ip.to_string(), colored);
+    }
+    eprintln!();
+}
+
+/// Write IPs only (one per line, fastest first) to `path`.
+fn write_output(results: &[PingResult], path: &Path) -> Result<()> {
+    let mut body = String::with_capacity(results.len() * 16);
+    for r in results {
+        body.push_str(&r.ip.to_string());
+        body.push('\n');
+    }
+    if let Some(parent) = path.parent().filter(|p| !p.as_os_str().is_empty()) {
+        std::fs::create_dir_all(parent)
+            .with_context(|| format!("create dir for {}", path.display()))?;
+    }
+    std::fs::write(path, &body).with_context(|| format!("write {}", path.display()))?;
+    eprintln!(
+        "{} saved {} IPs -> {}",
+        style("✓").green().bold(),
+        results.len(),
+        style(path.display()).cyan()
+    );
+    Ok(())
+}
diff --git a/src/ping.rs b/src/ping.rs
new file mode 100644
index 0000000..3d11e5b
--- /dev/null
+++ b/src/ping.rs
@@ -0,0 +1,224 @@
+//! Stage 1 (`ping`): TCP-probe Cloudflare IPs and collect the fastest
+//! reachable ones.
+//!
+//! We do NOT use ICMP: optimization cares about whether TCP 443 (the port the
+//! real VLESS+TLS connection uses) is reachable and fast. ICMP only tells us
+//! the host answers pings — a different thing, often throttled or blocked —
+//! and would need raw sockets or an external `ping` binary.
+//!
+//! Flow:
+//!   Phase A — availability pre-scan: sample a few IPs per segment, keep only
+//!             segments that answer (CF segment usability is very uneven).
+//!   Phase B — collection: sample uniformly across live segments and probe in
+//!             concurrent batches until `count` valid IPs are gathered (or the
+//!             `max_probe` budget is hit), then return the lowest-latency ones.
+
+use std::collections::{HashMap, HashSet};
+use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
+use std::time::{Duration, Instant};
+
+use anyhow::Result;
+use futures::stream::{self, StreamExt};
+use ipnet::IpNet;
+use rand::Rng;
+use rand::seq::SliceRandom;
+use tokio::net::TcpStream;
+use tokio::time::timeout;
+
+use crate::cloudflare::CfRanges;
+
+/// One reachable IP and its TCP-connect latency.
+#[derive(Clone, Debug)]
+pub struct PingResult {
+    pub ip: IpAddr,
+    pub latency: Duration,
+}
+
+/// Progress events emitted during a run so the caller can render UI. Keeps this
+/// module free of any console/progress-bar dependency.
+pub enum Progress {
+    /// A single IP just finished probing (emitted for every probe, live feed).
+    Probing { ip: IpAddr, ok: bool, valid: usize, probed: usize },
+    /// Availability pre-scan finished.
+    PreScan { live: usize, segments: usize, valid: usize },
+}
+
+/// Parameters for the ping stage.
+pub struct PingConfig {
+    /// Target number of valid IPs to collect.
+    pub count: usize,
+    /// Per-probe TCP connect timeout; slower than this is treated as down.
+    pub timeout: Duration,
+    /// Number of probes in flight at once.
+    pub concurrency: usize,
+    /// Whether IPv6 segments are included.
+    pub ipv6: bool,
+    /// TCP port to probe.
+    pub port: u16,
+    /// IPs sampled per segment during the availability pre-scan.
+    pub probe_sample: usize,
+    /// Hard cap on how many IPs we probe before giving up.
+    pub max_probe: usize,
+}
+
+/// Run the ping stage and return collected valid IPs, lowest latency first.
+///
+/// `on_progress` is invoked between probe batches with [`Progress`] events.
+pub async fn run(
+    ranges: &CfRanges,
+    cfg: &PingConfig,
+    mut on_progress: impl FnMut(Progress),
+) -> Result<Vec<PingResult>> {
+    let mut nets: Vec<IpNet> = ranges.v4.iter().map(|n| IpNet::V4(*n)).collect();
+    if cfg.ipv6 {
+        nets.extend(ranges.v6.iter().map(|n| IpNet::V6(*n)));
+    }
+    if nets.is_empty() {
+        return Ok(Vec::new());
+    }
+
+    let mut seen: HashSet<IpAddr> = HashSet::new();
+    let mut collected: Vec<PingResult> = Vec::new();
+
+    // Phase A: availability pre-scan, learn which segments are live.
+    let mut a_samples: Vec<(usize, IpAddr)> = Vec::new();
+    {
+        let mut rng = rand::thread_rng();
+        for (idx, net) in nets.iter().enumerate() {
+            for _ in 0..cfg.probe_sample {
+                let ip = random_host(net, &mut rng);
+                if seen.insert(ip) {
+                    a_samples.push((idx, ip));
+                }
+            }
+        }
+    }
+    let a_ips: Vec<IpAddr> = a_samples.iter().map(|(_, ip)| *ip).collect();
+    let mut probed = 0usize;
+    let mut a_hits: HashMap<IpAddr, Duration> = HashMap::new();
+    probe_each(a_ips, cfg.port, cfg.timeout, cfg.concurrency, |ip, lat| {
+        probed += 1;
+        if let Some(d) = lat {
+            a_hits.insert(ip, d);
+        }
+        on_progress(Progress::Probing { ip, ok: lat.is_some(), valid: a_hits.len(), probed });
+    })
+    .await;
+
+    let mut live_idx: HashSet<usize> = HashSet::new();
+    for (idx, ip) in &a_samples {
+        if let Some(d) = a_hits.get(ip) {
+            live_idx.insert(*idx);
+            collected.push(PingResult { ip: *ip, latency: *d });
+        }
+    }
+    let live_nets: Vec<IpNet> = nets
+        .iter()
+        .enumerate()
+        .filter(|(idx, _)| live_idx.contains(idx))
+        .map(|(_, net)| *net)
+        .collect();
+
+    on_progress(Progress::PreScan {
+        live: live_nets.len(),
+        segments: nets.len(),
+        valid: collected.len(),
+    });
+
+    if live_nets.is_empty() {
+        return Ok(finalize(collected, cfg.count));
+    }
+
+    // Phase B: collect until we have `count` valid IPs (or run out of budget).
+    while collected.len() < cfg.count && probed < cfg.max_probe {
+        let want = cfg.count - collected.len();
+        let budget = cfg.max_probe - probed;
+        let batch_size = (want * 2).max(cfg.concurrency).min(budget);
+
+        let batch = {
+            let mut rng = rand::thread_rng();
+            let mut cand: Vec<IpAddr> = Vec::with_capacity(batch_size);
+            let mut tries = 0;
+            let max_tries = batch_size.saturating_mul(20).max(1);
+            while cand.len() < batch_size && tries < max_tries {
+                if let Some(net) = live_nets.choose(&mut rng) {
+                    let ip = random_host(net, &mut rng);
+                    if seen.insert(ip) {
+                        cand.push(ip);
+                    }
+                }
+                tries += 1;
+            }
+            cand
+        };
+        if batch.is_empty() {
+            break;
+        }
+
+        probe_each(batch, cfg.port, cfg.timeout, cfg.concurrency, |ip, lat| {
+            probed += 1;
+            let ok = lat.is_some();
+            if let Some(d) = lat {
+                collected.push(PingResult { ip, latency: d });
+            }
+            on_progress(Progress::Probing { ip, ok, valid: collected.len(), probed });
+        })
+        .await;
+    }
+
+    Ok(finalize(collected, cfg.count))
+}
+
+/// Sort by latency ascending and keep the best `count`.
+fn finalize(mut results: Vec<PingResult>, count: usize) -> Vec<PingResult> {
+    results.sort_by_key(|r| r.latency);
+    results.truncate(count);
+    results
+}
+
+/// Probe a batch of IPs with bounded concurrency, invoking `on_each` as soon
+/// as every individual probe finishes (drives the live progress feed).
+async fn probe_each(
+    ips: Vec<IpAddr>,
+    port: u16,
+    to: Duration,
+    concurrency: usize,
+    mut on_each: impl FnMut(IpAddr, Option<Duration>),
+) {
+    let mut probes = stream::iter(
+        ips.into_iter().map(|ip| async move { (ip, probe_one(ip, port, to).await) }),
+    )
+    .buffer_unordered(concurrency.max(1));
+    while let Some((ip, lat)) = probes.next().await {
+        on_each(ip, lat);
+    }
+}
+
+/// One TCP-connect probe. Returns the connect latency, or None if it failed
+/// or timed out.
+async fn probe_one(ip: IpAddr, port: u16, to: Duration) -> Option<Duration> {
+    let addr = SocketAddr::new(ip, port);
+    let started = Instant::now();
+    match timeout(to, TcpStream::connect(addr)).await {
+        Ok(Ok(_stream)) => Some(started.elapsed()),
+        _ => None,
+    }
+}
+
+/// Pick a uniformly random usable host inside a CIDR segment.
+fn random_host(net: &IpNet, rng: &mut impl Rng) -> IpAddr {
+    match net {
+        IpNet::V4(n) => {
+            let first = u32::from(n.network());
+            let last = u32::from(n.broadcast());
+            let (lo, hi) = if last - first >= 2 { (first + 1, last - 1) } else { (first, last) };
+            IpAddr::V4(Ipv4Addr::from(rng.gen_range(lo..=hi)))
+        }
+        IpNet::V6(n) => {
+            let first = u128::from(n.network());
+            let last = u128::from(n.broadcast());
+            let (lo, hi) = if last - first >= 2 { (first + 1, last - 1) } else { (first, last) };
+            IpAddr::V6(Ipv6Addr::from(rng.gen_range(lo..=hi)))
+        }
+    }
+}