updating lock file

Ipv6 support

.all-contributorsrc

@@ -16,6 +16,56 @@
         "code",
         "design"
       ]
+    },
+    {
+      "login": "SakiiR",
+      "name": "SakiiR",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/9950578?v=4",
+      "profile": "https://sakiir.ovh",
+      "contributions": [
+        "code",
+        "bug"
+      ]
+    },
+    {
+      "login": "smackhack",
+      "name": "smackhack",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/48143394?v=4",
+      "profile": "https://github.com/smackhack",
+      "contributions": [
+        "ideas",
+        "example"
+      ]
+    },
+    {
+      "login": "bernardoamc",
+      "name": "Bernardo Araujo",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/428984?v=4",
+      "profile": "http://bernardoamc.github.io/",
+      "contributions": [
+        "code",
+        "bug",
+        "design"
+      ]
+    },
+    {
+      "login": "Isona",
+      "name": "Izzy Whistlecroft",
+      "avatar_url": "https://avatars2.githubusercontent.com/u/11759523?v=4",
+      "profile": "https://github.com/Isona",
+      "contributions": [
+        "bug"
+      ]
+    },
+    {
+      "login": "imlonghao",
+      "name": "imlonghao",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/4951333?v=4",
+      "profile": "https://imlonghao.com",
+      "contributions": [
+        "bug",
+        "maintenance"
+      ]
     }
   ],
   "contributorsPerLine": 7,

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,38 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS8.1]
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 22]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/config.yml

@@ -0,0 +1,2 @@
+todo:
+  keyword: "// TODO"

.github/workflows/basic.yml

@@ -0,0 +1,48 @@
+on: [push, pull_request]
+
+name: Continuous integration
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check

.gitignore

@@ -4,7 +4,6 @@
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
@@ -30,7 +29,6 @@ Cargo.lock
 *.sig
 
 pkg/
-src/
 
 ### Rust ###
 # Generated by Cargo
@@ -39,9 +37,9 @@ src/
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
 
 # End of https://www.toptal.com/developers/gitignore/api/rust,archlinuxpackages
+*.deb

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at brandon@skerritt.blog. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

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@@ -0,0 +1,825 @@
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Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rustscan"
-version = "1.1.0"
+version = "1.4.0"
 authors = ["Bee <[email protected]>"]
 edition = "2018"
 description = "Faster Nmap Scanning with Rust"
@@ -15,10 +15,14 @@ readme="README.md"
 
 [dependencies]
 colored = "1.9.3"
-clap = "2.33.0"
-rayon = "1.3.1"
+structopt = "0.3.15"
 async-std = "1.6.2"
 futures = "0.3"
+rlimit = "0.3.0"
+shell-words = "1.0.0"
+log = "0.4.0"
+env_logger = "0.7.1"
 
 [package.metadata.deb]
 depends = "$auto, nmap"
+

PKGBUILD

@@ -1,14 +0,0 @@
-# Maintainer: Bee <[email protected]>
-pkgname=rustscan-bin
-pkgver=1.1.0
-pkgrel=1
-pkgdesc="Faster Nmap Scanning with Rust"
-url="https://github.com/brandonskerritt/rustscan"
-license=("MIT")
-arch=("x86_64")
-provides=("rustscan")
-depends=('rustup')
-
-package() {
-	rustup toolchain install stable && cargo install rustscan
-}

README.md

@@ -1,12 +1,23 @@
 <p align="center">
-<img src="pictures/rustscan.png"><br>
-<u><b> Turns a 17 minutes Nmap scan into 19 seconds. </b></u><br> Find all open ports <b>fast</b> with Rustscan, automatically pipe them into Nmap. 
+➡️ 
+<a href="https://discord.gg/r38pna">Discord</a> |
+ <a href="https://github.com/RustScan/RustScan#-full-installation-guide">Installation Guide</a> |
+ <a href="https://github.com/RustScan/RustScan#-usage">Usage Guide</a>
+ ⬅️
+<br>
+<img src="pictures/rustscan.png">
+</p>
+<p align="center">
+<u><b> Turns a 17 minutes Nmap scan into 19 seconds. </b></u><br> Find all open ports <b>fast</b> with RustScan, automatically pipe them into Nmap. 
 </p>
 <p align="center">
-<img alt="Crates.io" src="https://img.shields.io/crates/d/rust_scan">
 <img alt="AUR version" src="https://img.shields.io/aur/version/rustscan-bin">
 <img src="https://img.shields.io/badge/Built%20with-Rust-Purple">
 <img alt="GitHub commit activity" src="https://img.shields.io/github/commit-activity/w/brandonskerritt/rustscan">
+<img alt="GitHub All Releases" src="https://img.shields.io/github/downloads/rustscan/rustscan/total?label=GitHub%20Downloads">
+<img alt="Crates.io" src="https://img.shields.io/crates/d/rustscan?label=Cargo%20Downloads">
+<img alt="Discord" src="https://img.shields.io/discord/736614461313515576">
+<img alt="Actions" src="https://github.com/RustScan/RustScan/workflows/Continuous%20integration/badge.svg?branch=master">
 </p>
 <hr>
 
@@ -14,16 +25,15 @@
 | <p align="center"><a href="https://crates.io/crates/rustscan">🔧 Cargo (Universal) </a></p> | <p align="center"><a href="https://crates.io/crates/rust_scan"> Arch </a></p> | <p align="center"><a href="https://crates.io/crates/rust_scan"> HomeBrew </a></p> | <p align="center"><a href="https://crates.io/crates/rust_scan"> Kali / Debian </p> |
 | ---- | ---- | ---- | --- |
 | <p align="center"><img src="pictures/rust.png" /></p>  | <p align="center"><img src="pictures/arch.png" /></p> | <p align="center"><img src="pictures/apple.png" /></p> | <p align="center"><img src="pictures/kali.png" /></p> |
-| **Version 1.1.0** | Version 1.0.0 | Version 1.0.0 | Version 1.0.0 |
-| `cargo install rustscan` | `yay rustscan` | `brew tap brandonskerritt/rustscan && brew install rustscan` | [Read the install guide](https://github.com/brandonskerritt/RustScan/blob/master/README.md#%EF%B8%8F-debian--kali) |
+| `cargo install rustscan` | `yay -S rustscan` | `brew tap brandonskerritt/rustscan && brew install rustscan` | [Read the install guide](https://github.com/brandonskerritt/RustScan/blob/master/README.md#%EF%B8%8F-debian--kali) |
 
-**Note**: You must have Nmap installed.
 <hr>
 
 # 🤔 What is this?
 1. Find ports quickly using Rustscan (**8 seconds at its fastest**).
 2. Automatically runs `nmap` on those ports.
-3. Profit???
+3. ???
+4. Profit!
 
 <table>
   <tr>
@@ -52,6 +62,7 @@ RustScans **only** job is to reduce the friction between finding open ports and
 * Saves you time by automatically piping it into Nmap. No more manual copying and pasting!
 * Does one thing and does it well. **Only** purpose is to improve Nmap, not replace it!
 * Let's you choose what Nmap commands to run, or uses the default.
+* IPv6 Support
 
 # 🔭 Why RustScan?
 Why spend time running fast scans and manually copying the ports, or waiting for a 20 minute scan to finish when you can just do all 65k ports in less than a minute?
@@ -93,11 +104,28 @@ The most universal way is to use `cargo`, Rust's built in package manager (think
 
 If you face any issues at all, please leave a GitHub issue. I have only tested this on Linux, so there may be issues for Mac OS or Windows. 
 
+Note: sometimes Rust doesn't add Cargo to the path. Please see [this issue](https://github.com/rust-lang/rustup/issues/2436) for how to fix that.
+
 ## 🖥️ Debian / Kali
 
 Download the .deb file from the releases page:
-[https://github.com/brandonskerritt/RustScan/releases/tag/1.0.1](https://github.com/brandonskerritt/RustScan/releases/tag/1.0.1)
-Run the commpand `dpkg -i` on the file. Note: sometimes you can double click the file to achieve the same result.
+
+[https://github.com/brandonskerritt/RustScan/releases](https://github.com/brandonskerritt/RustScan/releases)
+
+Run the commpand `dpkg -i` on the file. 
+
+Note: sometimes you can double click the file to achieve the same result.
+
+### 🥧 .deb file not working?
+The .deb file only works on AMD64 CPUs. If yours is different (such as a Raspberry Pi) or the .deb file doesn't work, it is easy to build the .deb file yourself.
+**Note**: It is easier to install Rust and install via Cargo, then it is to build the .deb file. But this is just in case!
+
+1. Install Rust You can do this with `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` which I took from the Rust website https://www.rust-lang.org/tools/install
+2. `cargo install rustscan` if you want the easiest method possible. Otherwise, to build the .deb file `cargo install cargo-deb`
+3. Git clone this repo `git clone https://github.com/brandonskerritt/RustScan`
+4. cd RustScan (into the git cloned repo) `cd RustScan`
+5. Run `cargo deb`
+6. Your .deb file is now located in `target/releases/Debian/`
 
 ## 🍺 HomeBrew
 
@@ -113,30 +141,139 @@ Install it:
 brew install rustscan
 ```
 
+## 🔧 Building it yourself
+
+1. Git clone the repo.
+2. Install Rust. You can do this with `curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh` which I took from the Rust website https://www.rust-lang.org/tools/install
+3. cd into the Git repo, and run `cargo build --release`
+4. The binary is located at `target/release/rustscan`
+5. Symlink to the binary or something. Whatever you want!
+
 # 🤸 Usage
 
 ```
 rustscan -h
 ```
 
-The format is `rustcan -b 500 -T 1500 192.168.0.1` to scan 192.168.0.1 with 500 batch size with a timeout of 1500ms. The timeout is how long RustScan waits for a response until it assumes the port is closed.
+```
+RustScan 1.2.0
+Bee https://github.com/brandonskerritt
+Fast Port Scanner built in Rust
+WARNING Do not use this program against sensitive infrastructure. The specified server may not be able to handle this
+many socket connections at once.
+
+USAGE:
+    rustscan [FLAGS] [OPTIONS] <ip> [command]...
+
+FLAGS:
+    -h, --help       Prints help information
+    -q, --quiet      Quiet mode. Only output the ports. No Nmap. Useful for grep or outputting to a file.
+    -V, --version    Prints version information
+
+OPTIONS:
+    -T, --timeout <T>    The timeout before a port is assumed to be close. In MS. [default: 1500]
+    -b, --batch <b>      Increases speed of scanning. The batch size for port scanning. Depends on your open file limit
+                         of OS. If you do 65535 it will do every port at the same time. Although, your OS may not
+                         support this. [default: 4500]
+    -u, --ulimit <u>     Automatically ups the ULIMIT with the value you provided.
+
+ARGS:
+    <ip>            The IP address to scan
+    <command>...    The Nmap arguments to run. To use the argument -A, end RustScan's args with '-- -A'. To run
+                    EXAMPLE: 'rustscan -T 1500 127.0.0.1 -- -A -sC'. This argument auto runs nmap {your commands}
+                    -vvv -p $PORTS 
+```
+
+The format is `rustscan -b 500 -T 1500 192.168.0.1` to scan 192.168.0.1 with 500 batch size with a timeout of 1500ms. The timeout is how long RustScan waits for a response until it assumes the port is closed.
 
 The batch size determines how fast RustScan is. Set it to 65k, and it will scan all 65k ports at the same time. This means at at 65k batch size, RustScan will take TIMEOUT long to scan all ports. Essentially, if timeout is 1000ms, **RustScan can scan in 1 second**. 
 
 Your operating system may not support this, but it is worth it to play around and see where your open file limit is. Shortly I will be releasing a dockerised version with a much larger open file limit, so this will be possible.
-## 🔌 Nmap
+
+## ⚠️ WARNING
+
+This program, by default, scans 5000 ports at a time (5000 per second). 
+
+This may cause damage to a server, or may make it incredibly obvious you are scanning the server.
+
+There are 2 ways to deal with this;
+1. Decrease batch size
+`rustscan -b 10` will run 10 port scans for 1 second, and then another 10 for 1 second and so on.
+2. Increase timeout
+`rustscan -T 5000` will mean RustScan waits 5 seconds until it scans the next ports.
+
+You can also use both of these at the same time, to make it as slow or as fast as you want. A fun favourite is 65535 batch size with 1 second timeout. Theoretically, this scans all 65535 ports in 1 second.
+
+**Please** do not use this tool against sensitive servers. It is designed mainly for Capture the Flag events, not real world servers with sensitive data.
+
+## 🚨 Thread Paniced at Main: Too Many Open Files
+This is the most common error found in RustScan.
+
+The open file limit is how many open sockets you can have at any given time.
+
+This limit changes from OS to OS.
+
+RustScan does not automatically create defaults (other than 5000) like Nmap does with their -T1, -T2 system.
+
+By figuring out for yourself the optimal batch size, you will know that RustScan is the most optimised port scanner for your system. 
+
+There are 2 things you can do:
+1. Decrease batch size
+2. Increase open file limit
+
+Decreasing batch size slows down the program, so as long as it isn't too drastic, this is a good option.
+
+Run these 3 commands:
+
+```
+ulimit -a
+ulimit -Hn
+ulimit -Sn
+```
+
+They will give you an idea on the open file limit of your OS.
+
+If it says "250", run `rustscan -b 240` for a batch size of 240.
+
+Increasing the open file limit increases speed, but poses danger. Although, **opening more file sockets on the specified IP address may damage it**.
+
+To open more, set the ulimit to a higher number:
+
+```
+ulimit -n 5000
+```
+
+**Mac OS**
+Mac OS has, from what I can tell, a naturally very low open file descriptor limit. The limit for Ubuntu is 8800. The limit for Mac OS is 255! 
+
+In this case, I would say it is safe to increase the open file limit. As most Linux based OS' have limits in the thousands. 
+
+Although, if this breaks anything, please don't blame me. 
+
+**Windows Subsystem for Linux**
+Windows Subsystem for Linux does not support ulimt (see issue #39). 
+
+The best way is to use it on a host computer, in Docker, or in a VM that isn't WSL. 
+
+**Automatic Ulimit updating**
+We are currently working on automatic Ulimit updating. If it is too high, it will lower itself. If it is too low, it will suggest a higher Ulimit. Watch [this issue](https://github.com/brandonskerritt/RustScan/issues/25) for more.
+
+## 🔌 Nmap Custom Flags
 To run your own nmap commands, end the RustScan command with `-- -A` where `--` indicates "end of RustScan flags, please do not parse anything further" and any flags after that will be entered into nmap.
 
 RustScan automatically runs `nmap -vvv -p $PORTS $IP`. To make it run `-A`, execute the command `rustscan 127.0.0.1 -- -A`. 
 
-**Note**: due to how Nmap behaves, sometimes you cannot SIGINT ctrl+c to end the scan and it acts like it is running in the background, but printing to STD::OUT. There is nothing I can do about this, unless I create a TTY shell for the sole purpose of running Nmap. Sorry 😓 I'll try to fix in an upcoming release. If any Rust experts want to help, please do!
+If you want to run commands such as `--script (vuln and safe)`, you will need to enclose it in quotations like so `--script '"(vuln and safe) or default"'`.
 
 ## 🎯 Increasing speed / accuracy
 * Batch size
-This increases speed, by allowing us to process more at once. Something experimental I am working on is changing the open file limit. You can do this manually with `ulimit -n 70000` and then running rustscan with `-B 65535`. This _should_ scan all 65535 ports at the exact same time. But this is extremely experimental.
+
+This increases speed, by allowing us to process more at once. Something experimental I am working on is changing the open file limit. You can do this manually with `ulimit -n 70000` and then running rustscan with `-b 65535`. This _should_ scan all 65535 ports at the exact same time. But this is extremely experimental.
 
 For non-experimental speed increases, slowly increase the batch size until it no longer gets open ports, or it breaks.
+
 * Accuracy (and some speed)
+
 To increase accuracy, the easiest way is to increase the timeout. The default is 1.5 seconds, by setting it to 4 seconds (4000) we are telling RustScan "if we do not hear back from a port in 4 seconds, assume it is closed".
 
 Decreasing accuracy gives some speed bonus, but my testing found that batch size dramatically changed the speed whereas timeout did, but not so much.
@@ -150,7 +287,7 @@ Ciphey is an automated decryption tool using artifical intelligence & natural la
 [Check it out here!](https://github.com/ciphey/ciphey)
 ## Contributors ✨
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-6-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
@@ -161,6 +298,11 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 <table>
   <tr>
     <td align="center"><a href="https://skerritt.blog"><img src="https://avatars3.githubusercontent.com/u/10378052?v=4" width="100px;" alt=""/><br /><sub><b>Brandon</b></sub></a><br /><a href="#infra-brandonskerritt" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/brandonskerritt/RustScan/commits?author=brandonskerritt" title="Tests">⚠️</a> <a href="https://github.com/brandonskerritt/RustScan/commits?author=brandonskerritt" title="Code">💻</a> <a href="#design-brandonskerritt" title="Design">🎨</a></td>
+    <td align="center"><a href="https://sakiir.ovh"><img src="https://avatars1.githubusercontent.com/u/9950578?v=4" width="100px;" alt=""/><br /><sub><b>SakiiR</b></sub></a><br /><a href="https://github.com/brandonskerritt/RustScan/commits?author=SakiiR" title="Code">💻</a> <a href="https://github.com/brandonskerritt/RustScan/issues?q=author%3ASakiiR" title="Bug reports">🐛</a></td>
+    <td align="center"><a href="https://github.com/smackhack"><img src="https://avatars2.githubusercontent.com/u/48143394?v=4" width="100px;" alt=""/><br /><sub><b>smackhack</b></sub></a><br /><a href="#ideas-smackhack" title="Ideas, Planning, & Feedback">🤔</a> <a href="#example-smackhack" title="Examples">💡</a></td>
+    <td align="center"><a href="http://bernardoamc.github.io/"><img src="https://avatars0.githubusercontent.com/u/428984?v=4" width="100px;" alt=""/><br /><sub><b>Bernardo Araujo</b></sub></a><br /><a href="https://github.com/brandonskerritt/RustScan/commits?author=bernardoamc" title="Code">💻</a> <a href="https://github.com/brandonskerritt/RustScan/issues?q=author%3Abernardoamc" title="Bug reports">🐛</a> <a href="#design-bernardoamc" title="Design">🎨</a></td>
+    <td align="center"><a href="https://github.com/Isona"><img src="https://avatars2.githubusercontent.com/u/11759523?v=4" width="100px;" alt=""/><br /><sub><b>Izzy Whistlecroft</b></sub></a><br /><a href="https://github.com/brandonskerritt/RustScan/issues?q=author%3AIsona" title="Bug reports">🐛</a></td>
+    <td align="center"><a href="https://imlonghao.com"><img src="https://avatars1.githubusercontent.com/u/4951333?v=4" width="100px;" alt=""/><br /><sub><b>imlonghao</b></sub></a><br /><a href="https://github.com/brandonskerritt/RustScan/issues?q=author%3Aimlonghao" title="Bug reports">🐛</a> <a href="#maintenance-imlonghao" title="Maintenance">🚧</a></td>
   </tr>
 </table>
 
@@ -169,10 +311,3 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
-
-RustScan has 2 major updates:
-```diff
-* 8 seconds for full port scan, theoretical 1 second full port scan (but you gotta have a BEAST of a PC)
-* Custom Nmap flags
-```
-https://github.com/brandonskerritt/RustScan

contributing.md

@@ -1,9 +1,31 @@
-This is my first Rust project! As such, I expect there are many, many bugs involved or things that can be sped up.
+Howdy Space Cow-Person 🤠🌌
 
-In particular, here is my roadmap:
-* Tokio async
-* Better UX
-* Optimised code
+RustScan is always looking for contributors. Whether that's spelling mistakes or major changes, your help is **wanted** and welcomed here.
 
+Before contributing, read our [code of conduct](https://github.com/RustScan/RustScan/blob/master/CODE_OF_CONDUCT.md).
 
-Please leave issues / pull requests, I'd love to learn more about this amazing language :) 
+TL;DR if you abuse members of our community you will be **perma-banned** with no chance to get unbanned. No warnings either. 🤗
+
+RustScan has 2 major labels for GitHub issues you should look at:
+* Good First issue
+These are issues for newcomers to open source! 
+[https://github.com/RustScan/RustScan/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22](https://github.com/RustScan/RustScan/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22)
+* Help wanted
+These are issues that aren't really for newcomers, but we could still do wiht help!
+[https://github.com/RustScan/RustScan/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22+label%3A%22help+wanted%22](https://github.com/RustScan/RustScan/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22+label%3A%22help+wanted%22)
+
+If you want to, solve the issue or comment on the issue for help.
+
+The flow for contributing to open source software is:
+* Fork the repo
+* Make changes
+* Pull request to the repo
+
+And then comment on the issue that you've done.
+
+RustScan also has some `// TODO`'s in the codebase, which are meant more for the core team but we wouldn't say no to help with these issues.
+
+If you have any feature suggestions or bugs, leave a GitHub issue. We welcome any and all support :D
+
+## Rewarding you
+I cannot pay you :-( But, I can place your GitHub profile on the README under `#Contributors` as a thank you! :)

elite.md

@@ -0,0 +1,72 @@
+Rust room
+
+# what is rust?
+* speed
+* saftey
+* cargo (pip but for rust)
+* Links to the rust book (the documentation for rust is literally an ebook)
+
+# Toolings
+
+
+# Introduction
+* if statements
+* functions
+* variables
+* loops
+
+Some basic questions like "how would u make variable x, how would u make a function named x" and so on
+
+# Expressions
+* rust return statements (they're super weird)
+* What is an expression?
+
+# Results object
+If something can fail in Rust, you **HAVE** to deal with the exception.
+
+FOr example
+
+```python3
+# python
+f = open("file.txt", 'r')
+```
+
+But in Rust, you **cannot** open a file unless you write an exception for if that file does not exist.
+
+In Rust, everything that can fail returns a <return> object. This means that you're never going to encounter an unexpected "file not found" or similar, because everything is accounted for.
+
+# Borrow checker
+Variables not in scope are killed. In Python, I think you can do:
+
+```
+if y = 6:
+    x = 3
+else:
+    x = 9
+```
+
+But in Rust, the borrow checker will kill X the second the if is over. You cannot create variables inside a scope and use them out fo the scope.
+
+You can however, do this
+
+```
+let x = if y == 6 {3} else {9}
+```
+
+This is a security feature, the borrow checker stops you from doing silly things with variables -- everything is either in scope or it's killed off.
+
+# Multi-threading
+* Rayon
+* Turning a for loop into multi-threaded with one word (into_iter -> into_para_iter)
+# Async
+* Basic async 101
+* Making a web server with async rust and how rust ensures saftey with async
+
+
+# Packaging
+* Packaging your rust app
+* Okay not security related but it's really cool it's just 1 command `rust publish`
+
+## TODO
+* Rust has an official discord (like, the one the Rust team uses to organise their codebase and create new features). I can ask them for their fave blueteam features of Rust :)
+* Ask if I'm allowed to include a link to the official discord of Rust. They only have like 2 help channels, the rest of the channels are for organising new features / work on the language itself. It's really cool to be able to see the language evole in Discord, rather than whatever C++ or Python uses (mailing lists I think)

girl

@@ -0,0 +1 @@
+nyaaa~~

rustscan-debbuilder/Dockerfile

@@ -0,0 +1,20 @@
+FROM rust:latest
+
+RUN git clone https://github.com/brandonskerritt/RustScan
+WORKDIR "/RustScan"
+RUN git pull --force
+RUN cargo install cargo-deb
+
+RUN apt update -y && apt upgrade -y
+RUN apt install libc6-dev-i386 -y
+RUN git clone --depth=1 https://github.com/raspberrypi/tools /raspberrypi-tools
+ENV PATH=/raspberrypi-tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin/:$PATH
+ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc
+RUN mkdir /root/.cargo
+RUN echo "[target.arm-unknown-linux-gnueabihf]" >> /root/.cargo/config
+RUN echo "strip = { path = \"arm-linux-gnueabihf-strip\" }" >> /root/.cargo/config
+RUN echo "objcopy = { path = \"arm-linux-gnueabihf-objcopy\" }" >> /root/.cargo/config
+
+COPY ./entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

rustscan-debbuilder/entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+cd /RustScan
+git pull --force
+
+#amd64
+cargo deb
+
+#arm64
+rustup target add arm-unknown-linux-gnueabihf
+cargo deb --target=arm-unknown-linux-gnueabihf
+
+#i386
+rustup target add i686-unknown-linux-gnu
+cargo deb --target=i686-unknown-linux-gnu
+
+find target/ -name \*.deb -exec cp {} /debs \;

rustscan-debbuilder/run.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+docker build -t rustscan-builder . || exit
+
+# This creates a volume which binds your currentdirectory/debs to 
+# the location where the deb files get spat out in the container.
+# You don't need to worry about it. Just chmod +x run.sh && ./run.sh and
+# you'll get yer .deb file in a few minutes. It runs faster after you've used it the first time.
+docker run -v "$(pwd)/debs:/debs" rustscan-builder

src/main.rs

@@ -1,213 +1,243 @@
-#!/bin/sh
-//usr/bin/env rustc $0 -o a.out && ./a.out && rm ./a.out ; exit
-use async_std::io;
-use async_std::net::TcpStream;
-use clap::{App, Arg, AppSettings};
+extern crate shell_words;
+
+mod scanner;
+use scanner::Scanner;
+
 use colored::*;
-use std::process::{exit, Command};
-use std::time::Duration;
-use std::{
-    net::{SocketAddr, Shutdown},
-    io::ErrorKind,
-};
-use async_std::prelude::*;
-use futures::stream::FuturesUnordered;
 use futures::executor::block_on;
+use rlimit::Resource;
+use rlimit::{getrlimit, setrlimit};
+use std::process::{exit, Command};
+use std::{net::IpAddr, time::Duration};
+use structopt::StructOpt;
+
+#[macro_use]
+extern crate log;
+
+#[derive(StructOpt, Debug)]
+#[structopt(name = "rustscan", setting = structopt::clap::AppSettings::TrailingVarArg)]
+/// Fast Port Scanner built in Rust.
+/// WARNING Do not use this program against sensitive infrastructure since the
+/// specified server may not be able to handle this many socket connections at once.
+struct Opts {
+    /// The IP address to scan
+    ip: String,
+
+    ///Quiet mode. Only output the ports. No Nmap. Useful for grep or outputting to a file.
+    #[structopt(short, long)]
+    quiet: bool,
+
+    /// The batch size for port scanning, it increases or slows the speed of
+    /// scanning. Depends on the open file limit of your OS.  If you do 65535
+    /// it will do every port at the same time. Although, your OS may not
+    /// support this.
+    #[structopt(short, long, default_value = "4500")]
+    batch_size: u64,
+
+    /// The timeout in milliseconds before a port is assumed to be closed.
+    #[structopt(short, long, default_value = "1500")]
+    timeout: u64,
+
+    /// Automatically ups the ULIMIT with the value you provided.
+    #[structopt(short, long)]
+    ulimit: Option<u64>,
+
+    /// IPv6 mode.
+    #[structopt(short, long)]
+    ipv6: bool,
+
+    /// The Nmap arguments to run.
+    /// To use the argument -A, end RustScan's args with '-- -A'.
+    /// Example: 'rustscan -T 1500 127.0.0.1 -- -A -sC'.
+    /// This command adds -Pn -vvv -p $PORTS automatically to nmap.
+    /// For things like --script '(safe and vuln)' enclose it in quotations marks \"'(safe and vuln)'\"")
+    command: Vec<String>,
+}
+
 /// Faster Nmap scanning with Rust
+/// If you're looking for the actual scanning, check out the module Scanner.
 fn main() {
-    let matches = App::new("RustScan")
-        .author("Bee https://github.com/brandonskerritt")
-        .about("Fast Port Scanner built in Rust")
-        .version("1.2.0")
-        .setting(AppSettings::TrailingVarArg)
-        
-        // IP address is a required argument
-        .arg(Arg::with_name("ip")
-            .required(true)
-            .index(1)
-            .long("ip-address")
-            .help("The IP address to scan"))
-        .arg(Arg::with_name("b")
-            .short("b")
-            .long("batch")
-            .takes_value(true)
-            .default_value("4500")
-            .help("Increases speed of scanning. The batch size for port scanning. Depends on your open file limit of OS. If you do 65535 it will do every port at the same time. Although, your OS may not support this."))
-        .arg(Arg::with_name("T")
-            .short("T")
-            .long("timeout")
-            .takes_value(true)
-            .default_value("1500")
-            .help("The timeout before a port is assumed to be close. In MS."))
-        .arg(
-            Arg::with_name("command")
-                .help("The Nmap arguments to run. To use the argument -A, end RustScan's args with '-- -A'. To run EXAMPLE: 'rustscan -T 1500 127.0.0.1 -- -A -sC'. This argument auto runs nmap {your commands} -vvv -p $PORTS ")
-                .takes_value(true)
-                .multiple(true),
-        )
-        .get_matches();
+    // logger
+    env_logger::init();
 
-    print_opening();
-
-    let ip = matches.value_of("ip").unwrap_or("None");
-    let command_matches= matches.values_of("command");
-    let command_run: String = match command_matches {
-        // We use the user supplied args
-        Some(x) => {
-            // TODO x is the same as below, use that instead
-            matches.values_of("command").unwrap().collect::<Vec<_>>().join(" ")
-        }
-        // we default
-        None    => "-A -vvv".to_string()
+    info!("Starting up");
+    let mut opts = Opts::from_args();
+    info!("Mains() `opts` arguments are {:?}", opts);
 
+    let user_nmap_options = if opts.command.is_empty() {
+        "-A -vvv".to_string()
+    } else {
+        opts.command.join(" ")
     };
 
-    let batch_size: u32 = matches
-                        .value_of("b")
-                        .unwrap_or("None")
-                        .parse::<u32>()
-                        .unwrap();
-                            
-    // gets timeout
-    let duration_timeout =
-        matches
-            .value_of("T")
-            .unwrap_or("None")
-            .parse::<u64>()
-            .unwrap();
-
-
-    // 65535 + 1 because of 0 indexing
-    let test = run_batched(ip.to_string(), 1, 65536, Duration::from_millis(duration_timeout),  batch_size);
-    let reports_fullsult = block_on(test);
-
-
-    // prints ports and places them into nmap string
-    let mut nmap_str_ports: Vec<String> = Vec::new();
-
-    // makes vector of open ports
-    for i in reports_fullsult.iter() {
-            // appends it to port
-            nmap_str_ports.push(i.to_string());
+    if !opts.quiet {
+        print_opening();
     }
 
-    // if no ports are found, suggest running with less 
+    // Updates ulimit when the argument is set
+
+    // Automatically ups the ulimit
+    if opts.ulimit.is_some() {
+        let limit = opts.ulimit.unwrap();
+        info!("Automatically upping ulimit");
+
+        if !opts.quiet {
+            println!("Automatically upping ulimit to {}", limit);
+        }
+
+        match setrlimit(Resource::NOFILE, limit, limit) {
+            Ok(_) => {}
+            Err(_) => println!("ERROR.  Failed to set Ulimit."),
+        }
+    }
+
+    let (x, _) = getrlimit(Resource::NOFILE).unwrap();
+
+    // if maximum limit is lower than batch size
+    // automatically re-adjust the batch size
+    if x < opts.batch_size {
+        if !opts.quiet {
+            println!("{}", "WARNING: Your file description limit is lower than selected batch size. Please considering upping this (how to is on the README). NOTE: this may be dangerous and may cause harm to sensitive servers. Automatically reducing Batch Size to match your limit, this process isn't harmful but reduces speed.".red());
+        }
+
+        // if the OS supports high file limits like 8000
+        // but the user selected a batch size higher than this
+        // reduce to a lower number
+        // basically, ubuntu is 8000
+        // but i can only get it to work on < 5k in testing
+        // 5k is default, so 3000 seems safe
+        if x > 8000 {
+            opts.batch_size = 3000
+        } else {
+            opts.batch_size = x - 100u64
+        }
+    }
+    // else if the ulimit is higher than batch size
+    // tell the user they can increase batch size
+    // if the user set ulimit arg they probably know what they are doing so don't print this
+    else if x + 2 > opts.batch_size.into() && (opts.ulimit.is_none()) {
+        if !opts.quiet {
+            println!(
+                "Your file description limit is higher than the batch size. You can potentially increase the speed by increasing the batch size, but this may cause harm to sensitive servers. Your limit is {}, try batch size {}.",
+                x,
+                x - 1u64
+            );
+        }
+    }
+
+    let addr = match opts.ip.parse::<IpAddr>() {
+        Ok(res) => res,
+        Err(_) => panic!("Could not parse IP Address"),
+    };
+
+    // 65535 + 1 because of 0 indexing
+    let scanner = Scanner::new(
+        addr,
+        1,
+        65535,
+        opts.batch_size.into(),
+        Duration::from_millis(opts.timeout.into()),
+        opts.quiet,
+    );
+    let scan_result = block_on(scanner.run());
+
+    // prints ports and places them into nmap string
+    let nmap_str_ports: Vec<String> = scan_result
+        .into_iter()
+        .map(|port| port.to_string())
+        .collect();
+
+    // if no ports are found, suggest running with less
     if nmap_str_ports.is_empty() {
         panic!("{} Looks like I didn't find any open ports. This is usually caused by a high batch size.
-        \n*I used {} threads, consider lowering to {} with {} or a comfortable number lfor your system. 
-        \n Alternatively, increase the timeout if your ping is high. Rustscan -T 2000 for 2000 second timeout.", "ERROR".red(), batch_size, (batch_size / 2).to_string().green(), "'rustscan -b <batch_size> <ip address>'".green());
+        \n*I used {} batch size, consider lowering to {} with {} or a comfortable number for your system.
+        \n Alternatively, increase the timeout if your ping is high. Rustscan -T 2000 for 2000 second timeout.", "ERROR".red(),
+        opts.batch_size,
+        (opts.batch_size / 2).to_string().green(),
+        "'rustscan -b <batch_size> <ip address>'".green());
     }
 
     // Tells the user we are now switching to Nmap
-    println!(
-        "{}",
-        "Starting nmap.".blue(),
-    );
+    if !opts.quiet {
+        println!("{}", "Starting nmap.".blue(),);
+    }
 
     // nmap port style is 80,443. Comma seperated with no spaces.
     let ports_str = nmap_str_ports.join(",");
-    let string_format = format!("{} {} {} {} {}", command_run, "-vvv", "-p", &ports_str, ip);
-    let command_list = string_format.split_whitespace();
-    let vec = command_list.collect::<Vec<&str>>();
+
+    // if quiet mode is on, return ports and exit
+    if opts.quiet {
+        println!("{}", ports_str);
+        exit(1);
+    }
+
+    let nmap_args = if !opts.ipv6 {
+        format!(
+            "{} {} {} {} {} {}",
+            &user_nmap_options, "-vvv", "-Pn", "-p", &ports_str, opts.ip
+        )
+    } else {
+        format!(
+            "{} {} {} {} {} {} {}",
+            &user_nmap_options, "-vvv", "-Pn", "-6", "-p", &ports_str, opts.ip
+        )
+    };
+
+    if !opts.quiet {
+        println!("The Nmap command to be run is {}", &nmap_args);
+    }
+    let nmap_args = shell_words::split(&nmap_args).expect("failed to parse nmap arguments");
 
     // Runs the nmap command and spawns it as a process.
-    Command::new("nmap")
-        .args(&vec)
+    let mut child = Command::new("nmap")
+        .args(&nmap_args)
         .spawn()
-        .expect("failed to execute process");
-}
+        .expect("failed to execute nmap process");
 
-pub async fn run_batched(
-    host: String,
-    port_start: u32,
-    port_end: u32,
-    timeout: Duration,
-    batch: u32,
-) -> Vec<u32> {
-    // run the scans in batches
-    let mut begin = port_start;
-    let mut end = begin + batch;
-    let mut all_addrs: std::vec::Vec<u32> = Vec::new();
-
-    while end <= port_end {
-        let mut batch_addrs = execute(host.clone(), begin, end, timeout).await;
-        all_addrs.append(&mut batch_addrs);
-        begin = end+1;
-        end += batch;
-    }
-    all_addrs
-}
-async fn execute(
-    host: String,
-    port_start: u32,
-    port_end: u32,
-    timeout: Duration,
-) -> Vec<u32> {
-    // runs a scan against a range of ports
-    let mut ftrs = FuturesUnordered::new();
-    // TODO can I make this async?
-    for port in port_start..port_end {
-        ftrs.push(try_connect(host.clone(), port, timeout));
-    }
-
-    let mut open_addrs: Vec<u32> = Vec::new();
-    // TODO can I make this async?
-    while let Some(result) = ftrs.next().await {
-        match result {
-            Ok(addr) => open_addrs.push(addr),
-            Err(_) => {}
-        }
-    }
-    open_addrs
-}
-
-async fn try_connect(host: String, port: u32, timeout: Duration) -> io::Result<u32> {
-    let addr = host.to_string() + ":" + &port.to_string();
-    match addr.parse() {
-        Ok(sock_addr) => match connect(sock_addr, timeout).await {
-            Ok(stream_result) => {
-                match stream_result.shutdown(Shutdown::Both) {
-                    _ => {}
-                }
-                println!("Open {}", port.to_string().purple());
-                Ok(port)
-            }
-            Err(e) => match e.kind() {
-                ErrorKind::Other => {
-                    eprintln!("{:?}", e); // in case we get too many open files
-                    panic!("Too many open files. Please reduce batch size. The default is 5000. Try -B 2500.");
-                    Err(e)
-                }
-                _ => Err(io::Error::new(io::ErrorKind::Other, e.to_string())),
-            },
-        },
-        Err(e) => {
-            eprintln!("Unable to convert to socket address {:?}", e);
-            panic!("Unable to convert to socket address");
-            Err(io::Error::new(io::ErrorKind::Other, e.to_string()))
-        }
-    }
-}
-
-
-async fn connect(addr: SocketAddr, timeout: Duration) -> io::Result<TcpStream> {
-    let stream = io::timeout(timeout, async move { TcpStream::connect(addr).await }).await?;
-    Ok(stream)
+    child.wait().expect("failed to wait on nmap process");
 }
 
+/// Prints the opening title of RustScan
 fn print_opening() {
+    info!("Printing opening");
     let s = "
-     _____           _    _____                 
-    |  __ \\         | |  / ____|                
-    | |__) |   _ ___| |_| (___   ___ __ _ _ __  
-    |  _  / | | / __| __|\\___ \\ / __/ _` | '_ \\ 
+     _____           _    _____
+    |  __ \\         | |  / ____|
+    | |__) |   _ ___| |_| (___   ___ __ _ _ __
+    |  _  / | | / __| __|\\___ \\ / __/ _` | '_ \\
     | | \\ \\ |_| \\__ \\ |_ ____) | (_| (_| | | | |
     |_|  \\_\\__,_|___/\\__|_____/ \\___\\__,_|_| |_|
     Faster nmap scanning with rust.";
-    println!(
-        "{} \n {} \n {}",
-        s.green(),
-        "Automated Decryption Tool - https://github.com/ciphey/ciphey".red(),
-        "Creator https://github.com/brandonskerritt".green()
-    );
+    println!("{}\n", s.green());
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Scanner;
+    use async_std::task::block_on;
+    use std::{net::IpAddr, time::Duration};
+
+    #[test]
+    fn does_it_run() {
+        // Makes sure te program still runs and doesn't panic
+        let addr = match "127.0.0.1".parse::<IpAddr>() {
+            Ok(res) => res,
+            Err(_) => panic!("Could not parse IP Address"),
+        };
+        let scanner = Scanner::new(addr, 1, 65535, 1000, Duration::from_millis(10), true);
+        let scan_result = block_on(scanner.run());
+        // if the scan fails, it wouldn't be able to assert_eq! as it panicked!
+        assert_eq!(1, 1);
+    }
+    fn does_it_run_ivp6() {
+        // Makes sure te program still runs and doesn't panic
+        let addr = match "::1".parse::<IpAddr>() {
+            Ok(res) => res,
+            Err(_) => panic!("Could not parse IP Address"),
+        };
+        let scanner = Scanner::new(addr, 1, 65535, 1000, Duration::from_millis(10), true);
+        let scan_result = block_on(scanner.run());
+        // if the scan fails, it wouldn't be able to assert_eq! as it panicked!
+        assert_eq!(1, 1);
+    }
 }

src/scanner.rs

@@ -0,0 +1,148 @@
+use async_std::io;
+use async_std::net::TcpStream;
+use async_std::prelude::*;
+use colored::*;
+use futures::stream::FuturesUnordered;
+use std::time::Duration;
+use std::{
+    io::ErrorKind,
+    net::{IpAddr, Shutdown, SocketAddr},
+};
+
+/// The class for the scanner
+/// Host is data type IpAddr and is the host address
+/// start & end is where the port scan starts and ends
+/// batch_size is how many ports at a time should be scanned
+/// Timeout is the time RustScan should wait before declaring a port closed. As datatype Duration.
+/// Quiet is whether or not RustScan should print things, or wait until the end to print only open ports.
+/// ipv6 is whether or not this scan is an ipv6 scan.
+pub struct Scanner {
+    host: IpAddr,
+    start: u16,
+    end: u16,
+    batch_size: u64,
+    timeout: Duration,
+    quiet: bool,
+}
+
+impl Scanner {
+    pub fn new(
+        host: IpAddr,
+        start: u16,
+        end: u16,
+        batch_size: u64,
+        timeout: Duration,
+        quiet: bool,
+    ) -> Self {
+        Self {
+            host: host.to_owned(),
+            start,
+            end,
+            batch_size,
+            timeout,
+            quiet,
+        }
+    }
+
+    /// Runs scan_range with chunk sizes
+    /// If you want to run RustScan normally, this is the entry point used
+    /// Returns all open ports as Vec<u16>
+    pub async fn run(&self) -> Vec<u16> {
+        let ports: Vec<u16> = (self.start..self.end).collect();
+        let mut open_ports: std::vec::Vec<u16> = Vec::new();
+        // TODO change this to port size
+        // to fix bug when we introduce custom port ranges
+
+        for range in ports.chunks(self.batch_size as usize) {
+            let mut ports = self.scan_range(range).await;
+            open_ports.append(&mut ports);
+        }
+
+        open_ports
+    }
+
+    /// Given a range of ports, scan them all.
+    /// Returns a vector of open ports.
+    async fn scan_range(&self, range: &[u16]) -> Vec<u16> {
+        let mut ftrs = FuturesUnordered::new();
+        for port in range {
+            ftrs.push(self.scan_port(*port));
+        }
+
+        let mut open_ports: Vec<u16> = Vec::new();
+        while let Some(result) = ftrs.next().await {
+            match result {
+                Ok(port) => open_ports.push(port),
+                _ => {}
+            }
+        }
+
+        open_ports
+    }
+
+    /// Given a port, scan it.
+    /// Turns the address into a SocketAddr
+    /// Deals with the <result> type
+    /// If it experiences error ErrorKind::Other then too many files are open and it Panics!
+    /// ese any other error, it returns the error in Result as a string
+    /// If no  errors occur, it returns the port number in Result to signify the port is open.
+    /// This function mainly deals with the logic of Results handling.
+    /// # Example
+    /// ```rust
+    ///     self.scan_port(10:u16)
+    /// ```
+    /// Note: `self` must contain `self.host`.
+    async fn scan_port(&self, port: u16) -> io::Result<u16> {
+        let addr = SocketAddr::new(self.host, port);
+        // println!("{:?}", addr);
+        match self.connect(addr).await {
+            Ok(x) => {
+                // match stream_result.shutdown(Shutdown::Both)
+                info!("Shutting down stream");
+                match x.shutdown(Shutdown::Both) {
+                    _ => {}
+                }
+                if !self.quiet {
+                    println!("Open {}", port.to_string().purple());
+                }
+                // if connection successful
+                // shut down stream
+                // return port
+                Ok(port)
+            }
+            Err(e) => match e.kind() {
+                ErrorKind::Other => {
+                    panic!("Too many open files. Please reduce batch size. The default is 5000. Try -b 2500.");
+                }
+                _ => Err(io::Error::new(io::ErrorKind::Other, e.to_string())),
+            },
+        }
+    }
+
+    /// Performs the connection to the socket with timeout
+    /// # Example
+    /// ```rust
+    ///     let port: u16 = 80
+    ///     // Host is an IpAddr type
+    ///     let host = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    ///     let addr = SocketAddr::new(host, port)
+    ///     self.connect(addr)
+    ///     // returns Result which is either Ok(stream) for port is open, or Er for port is closed.
+    ///     // Timesout after self.timeouts seconds
+    ///     ```
+    async fn connect(&self, addr: SocketAddr) -> io::Result<TcpStream> {
+        let stream =
+            io::timeout(self.timeout, async move { TcpStream::connect(addr).await }).await?;
+        info!("Returning okay from connect");
+        Ok(stream)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn does_it_run() {
+        // TODO run functions here
+        assert_eq!(1, 1);
+    }
+}