From 372b4a5a34956353d722f48c92768e6b6abc942f Mon Sep 17 00:00:00 2001
From: Eduard Tolosa <edu4rdshl@protonmail.com>
Date: Mon, 28 Sep 2020 11:49:21 -0500
Subject: [PATCH] Initial commit.

---
 .gitignore  |   2 +
 Cargo.lock  | 917 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  19 ++
 src/main.rs | 121 +++++++
 4 files changed, 1059 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..360c262
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..2ffd41c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "rusolver"
+version = "0.1.0"
+authors = ["Eduard Tolosa <edu4rdshl@protonmail.com>"]
+edition = "2018"
+description = "Fast DNS resolver written in Rust."
+repository = "https://github.com/edu4rdshl/rusolver"
+license = "GPL-3.0-or-later"
+keywords = ["dns-resolution", "dns-resolver"]
+readme = "README.md"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "0.2.22", features = ["full"] }
+futures = "0.3.5"
+trust-dns-resolver = "0.19.5"
+clap = "2.33.3"
+rand = "0.7.3"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7058a0f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,121 @@
+use {
+    clap::{value_t, App, Arg},
+    futures::stream::StreamExt,
+    rand::Rng,
+    std::net::IpAddr,
+    tokio::{
+        self,
+        io::{self, AsyncReadExt},
+    },
+    trust_dns_resolver::{
+        config::{NameServerConfigGroup, ResolverConfig, ResolverOpts},
+        TokioAsyncResolver,
+    },
+};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Eval args
+    let matches = App::new("Rusolver")
+        .version("0.1.0")
+        .author("Eduard Tolosa <edu4rdshl@protonmail.com>")
+        .about("Fast DNS resolver written in Rust.")
+        .arg(
+            Arg::with_name("threads")
+                .short("t")
+                .long("threads")
+                .takes_value(true)
+                .help("Number of threads. Default: 500"),
+        )
+        .arg(
+            Arg::with_name("timeout")
+                .long("timeout")
+                .takes_value(true)
+                .help("Timeout in seconds. Default: 1"),
+        )
+        .arg(
+            Arg::with_name("ip")
+                .short("i")
+                .long("ip")
+                .takes_value(false)
+                .help("Show the discovered IP addresses. Default: false"),
+        )
+        .get_matches();
+
+    // Assign values or use defaults
+    let show_ip_adress = matches.is_present("ip");
+    let threads = value_t!(matches.value_of("threads"), usize).unwrap_or_else(|_| 500);
+    let timeout = value_t!(matches.value_of("timeout"), u64).unwrap_or_else(|_| 1);
+
+    // Resolver opts
+    let mut options = ResolverOpts::default();
+    options.timeout = std::time::Duration::from_secs(timeout);
+
+    // Read stdin
+    let mut buffer = String::new();
+    let mut stdin = io::stdin();
+    stdin.read_to_string(&mut buffer).await?;
+    let hosts: Vec<String> = buffer.lines().map(str::to_owned).collect();
+
+    futures::stream::iter(hosts.into_iter().map(|host| async move {
+        let dns_ips = vec![
+            // Cloudflare
+            "1.1.1.1",
+            "1.0.0.1",
+            // Google
+            "8.8.8.8",
+            "8.8.4.4",
+            // Quad9
+            "9.9.9.9",
+            "149.112.112.112",
+            // OpenDNS
+            "208.67.222.222",
+            "208.67.220.220",
+            // Verisign
+            "64.6.64.6",
+            "64.6.65.6",
+            // UncensoredDNS
+            "91.239.100.100 ",
+            "89.233.43.71 ",
+            // dns.watch
+            "84.200.69.80",
+            "84.200.70.40",
+        ];
+        if let Ok(ip) = TokioAsyncResolver::tokio(
+            ResolverConfig::from_parts(
+                None,
+                vec![],
+                NameServerConfigGroup::from_ips_clear(
+                    &[IpAddr::V4(
+                        dns_ips[rand::thread_rng().gen_range(0, dns_ips.len())]
+                            .parse()
+                            .unwrap(),
+                    )],
+                    53,
+                ),
+            ),
+            options,
+        )
+        .await
+        .unwrap()
+        .ipv4_lookup(host.clone() + ".")
+        .await
+        {
+            if show_ip_adress {
+                println!(
+                    "{};{:?}",
+                    host,
+                    ip.into_iter()
+                        .map(|x| x.to_string())
+                        .collect::<Vec<String>>()
+                )
+            } else {
+                println!("{}", host)
+            }
+        }
+    }))
+    .buffer_unordered(threads)
+    .collect::<Vec<()>>()
+    .await;
+    Ok(())
+}