From 44b8380ad8dec66a10eb6c3f20fef436f91a615d Mon Sep 17 00:00:00 2001
From: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date: Thu, 22 Oct 2020 19:41:05 -0500
Subject: [PATCH] Update to tokio 0.3 and add IPv6 support

---
 Cargo.lock  | 876 ++++++++++++++++++++++++++++++----------------------
 Cargo.toml  |  10 +-
 src/main.rs |  40 +--
 3 files changed, 537 insertions(+), 389 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 0aa001d..0968f55 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,773 +1,927 @@
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-"checksum wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b89c3ce4ce14bdc6fb6beaf9ec7928ca331de5df7e5ea278375642a2f478570d"
-"checksum widestring 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "effc0e4ff8085673ea7b9b2e3c73f6bd4d118810c9009ed8f1e16bd96c331db6"
-"checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
-"checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
-"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum winreg 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
-"checksum winutil 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7daf138b6b14196e3830a588acf1e86966c694d3e8fb026fb105b8b5dca07e6e"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
diff --git a/Cargo.toml b/Cargo.toml
index 0925bff..e792c6c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,8 +12,8 @@ license = "MIT"
 edition = "2018"
 
 [dependencies]
-futures = "0.3"
-getopts = "0.2"
-rand = "0.7"
-tokio = { version = "0.2", features = [ "io-util", "macros", "rt-core", "rt-threaded", "tcp", ] }
-trust-dns-resolver = "0.18"
+futures = "0.3.6"
+getopts = "0.2.21"
+rand = "0.7.3"
+tokio = { version = "0.3.1", features = [ "io-util", "net", "rt-multi-thread", "parking_lot", "stream", "macros", ] }
+trust-dns-resolver = "0.19.5"
diff --git a/src/main.rs b/src/main.rs
index 1c3246f..8fc4653 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,10 @@
-#[macro_use]
-extern crate futures;
-
 use getopts::Options;
 use std::env;
-use tokio::net::{TcpListener, TcpStream};
 use std::sync::atomic::{AtomicBool, Ordering};
+use tokio::join;
+use tokio::net::{TcpListener, TcpStream};
 
-type Error = Box<dyn std::error::Error + Sync + Send + 'static>;
+type BoxedError = Box<dyn std::error::Error + Sync + Send + 'static>;
 static DEBUG: AtomicBool = AtomicBool::new(false);
 
 fn print_usage(program: &str, opts: Options) {
@@ -18,7 +16,7 @@ fn print_usage(program: &str, opts: Options) {
 }
 
 #[tokio::main]
-async fn main() -> Result<(), Error> {
+async fn main() -> Result<(), BoxedError> {
     let args: Vec<String> = env::args().collect();
     let program = args[0].clone();
 
@@ -61,11 +59,15 @@ async fn main() -> Result<(), Error> {
     forward(&bind_addr, local_port, &remote_host, remote_port).await
 }
 
-async fn forward(bind_ip: &str, local_port: i32, remote_host: &str, remote_port: i32) -> Result<(), Error> {
+async fn forward(bind_ip: &str, local_port: i32, remote_host: &str, remote_port: i32) -> Result<(), BoxedError> {
     // Listen on the specified IP and port
-    let bind_addr = format!("{}:{}", bind_ip, local_port);
-    let bind_sock = bind_addr.parse::<std::net::SocketAddr>()?;
-    let mut listener = TcpListener::bind(&bind_sock).await?;
+    let bind_addr = if bind_ip.contains(':') {
+        format!("[{}]:{}", bind_ip, local_port)
+    } else {
+        format!("{}:{}", bind_ip, local_port)
+    };
+    let bind_sock = bind_addr.parse::<std::net::SocketAddr>().expect("Failed to parse bind address");
+    let listener = TcpListener::bind(&bind_sock).await?;
     println!("Listening on {}", listener.local_addr().unwrap());
 
     // We have either been provided an IP address or a host name.
@@ -77,21 +79,13 @@ async fn forward(bind_ip: &str, local_port: i32, remote_host: &str, remote_port:
             // It's a hostname; we're going to need to resolve it.
             // Create an async dns resolver
 
-            use trust_dns_resolver::AsyncResolver;
+            use trust_dns_resolver::TokioAsyncResolver;
             use trust_dns_resolver::config::*;
 
-            let runtime = tokio::runtime::Runtime::new()?;
-
-            let resolver = match AsyncResolver::new(
+            let resolver = TokioAsyncResolver::tokio(
                 ResolverConfig::default(),
-                ResolverOpts::default(),
-                runtime.handle().clone(),
-            ).await {
-                Ok(r) => r,
-                Err(e) => {
-                    panic!("Error creating DNS resolver: {:?}", e);
-                }
-            };
+                ResolverOpts::default())
+            .await.expect("Failed to create DNS resolver");
 
             let resolutions = resolver.lookup_ip(remote_host).await.expect("Failed to resolve server IP address!");
             let remote_addr = resolutions.iter().nth(1).expect("Failed to resolve server IP address!");
@@ -145,7 +139,7 @@ async fn forward(bind_ip: &str, local_port: i32, remote_host: &str, remote_port:
                     }
                 };
 
-                let r: Result<(), Error> = Ok(());
+                let r: Result<(), BoxedError> = Ok(());
                 r
         });
     }