cargo format

Bump structopt from 0.3.15 to 0.3.16

.all-contributorsrc

@@ -36,11 +36,57 @@
         "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"
+      ]
+    },
+    {
+      "login": "Atul9",
+      "name": "Atul Bhosale",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/3390330?v=4",
+      "profile": "https://github.com/Atul9",
+      "contributions": [
+        "doc"
+      "login": "royharoush",
+      "name": "royharoush",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/8113056?v=4",
+      "profile": "https://github.com/royharoush",
+      "contributions": [
+        "ideas",
+        "design"
+      ]
     }
   ],
   "contributorsPerLine": 7,
   "projectName": "RustScan",
-  "projectOwner": "brandonskerritt",
+  "projectOwner": "RustScan",
   "repoType": "github",
   "repoHost": "https://github.com",
   "skipCi": true

.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/action.yml

@@ -0,0 +1,10 @@
+name: Check Markdown links
+
+on: push
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: gaurav-nelson/github-action-markdown-link-check@v1

.github/workflows/basic.yml

@@ -0,0 +1,55 @@
+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
+
+  links:
+        name: markdown-link-check
+        runs-on: ubuntu-latest
+        steps:
+        - uses: actions/checkout@master
+        - uses: gaurav-nelson/github-action-markdown-link-check@v1

.github/workflows/markdown_link_check_9am_daily.yml

@@ -0,0 +1,18 @@
+name: Check Markdown links
+
+on: 
+  push:
+    branches:
+    - master
+  schedule:
+  # Run everyday at 9:00 AM (See https://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html#tag_20_25_07)
+  - cron: "0 9 * * *"
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: gaurav-nelson/github-action-markdown-link-check@v1
+      with:
+        use-quiet-mode: 'yes'

.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

.travis.yml

@@ -0,0 +1,56 @@
+language: rust
+
+os:
+  - linux
+  - osx
+  # - windows
+
+arch:
+  - amd64
+  - arm64
+
+services:
+  - docker  
+
+before_install:
+- rustup component add rustfmt
+
+# cargo test
+rust:
+  - stable
+  - beta
+jobs:
+  fast_finish: true
+
+# Cargo fmt
+script:
+- cargo build
+- cargo test
+- cargo fmt -- --check
+
+# automatic deployment to cargo on release
+# deploy:
+
+#   provider: releases
+#   api_key: "GITHUB OAUTH TOKEN"
+#   file: "FILE TO UPLOAD"
+#   skip_cleanup: true
+#   on:
+#     tags: true
+
+# after_success:
+#   - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh
+#   - chmod +x send.sh
+#   - ./send.sh success $WEBHOOK_URL
+
+        # only deploy on master branch
+        # on:
+                # branch: master
+        # provider: cargo
+        # token: $crates 
+
+
+after_failure:
+  - wget https://raw.githubusercontent.com/DiscordHooks/travis-ci-discord-webhook/master/send.sh
+  - chmod +x send.sh
+  - ./send.sh failure $WEBHOOK_URL

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

Cargo.lock

@@ -0,0 +1,980 @@
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "841a6d1c35c6f596ccea1f82504a192a60378f64b3bb0261904ad8f2f5657556"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93b162580e34310e5931c4b792560108b10fd14d64915d7fff8ff00180e70092"
+
+[[package]]
+name = "web-sys"
+version = "0.3.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dda38f4e5ca63eda02c059d243aa25b5f35ab98451e518c51612cd0f1bd19a47"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "wepoll-sys-stjepang"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fd319e971980166b53e17b1026812ad66c6b54063be879eb182342b55284694"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

Cargo.toml

@@ -1,11 +1,11 @@
 [package]
 name = "rustscan"
-version = "1.2.0"
+version = "1.6.0"
 authors = ["Bee <[email protected]>"]
 edition = "2018"
 description = "Faster Nmap Scanning with Rust"
-homepage = "https://github.com/brandonskerritt/rustscan"
-repository = "https://github.com/brandonskerritt/rustscan"
+homepage = "https://github.com/rustscan/rustscan"
+repository = "https://github.com/rustscan/rustscan"
 license = "MIT"
 keywords = ["port", "scanning", "nmap"]
 categories = ["command-line-utilities"]
@@ -14,12 +14,20 @@ readme="README.md"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-colored = "1.9.3"
-clap = "2.33.0"
-rayon = "1.3.1"
+colored = "2.0.0"
+structopt = "0.3.16"
 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"
+dirs = "3.0.1"
+gcd = "2.0.1"
+rand = "0.7.3"
+colorful = "0.2.1"
+ansi_term = "0.12.1"
 
 [package.metadata.deb]
 depends = "$auto, nmap"
+section = "rust"

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

@@ -1,27 +1,38 @@
 <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/GFrQsGy">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="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>
 
-
-| <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"><a href="https://hub.docker.com/r/cmnatic/rustscan">🐋 Docker (Recommended) </a></p> | <p align="center"><a href="https://github.com/RustScan/RustScan/releases">👩‍💻 Kali / Debian </p> | <p align="center"><a href="https://aur.archlinux.org/packages/rustscan/">🏗️ Arch </a></p> | <p align="center"><a href="https://crates.io/crates/rustscan">🔧 Cargo (Universal) </a></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 1.1.0 | Version 1.1.0 | Version 1.1.0 |
-| `cargo install rustscan` | `yay -S rustscan-bin` | `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) |
+| <p align="center"><img src="pictures/docker.png" /></p> | <p align="center"><img src="pictures/kali.png" /></p> | <p align="center"><img src="pictures/arch.png" /></p> | <p align="center"><img src="pictures/rust.png" /></p>
+| `docker pull cmnatic/rustscan:debian-buster` <p>[Usage](https://github.com/RustScan/RustScan#docker-whale) | [Read the install guide](https://github.com/brandonskerritt/RustScan/blob/master/README.md#%EF%B8%8F-debian--kali) | `yay -S rustscan` | `cargo install rustscan`
 
 <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>
@@ -50,6 +61,20 @@ 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
+
+## ‼️ Important Links
+
+| Installation Guide | Documentation | Discord |
+| ------------------ | ------------- | ------- |
+| 📖 [Installation Guide](https://github.com/RustScan/RustScan#-full-installation-guide) | 📚 [Documentation](https://github.com/RustScan/RustScan/issues/89) | 🦜 [Discord](https://discord.gg/GFrQsGy)
+
+## 🙋 Table of Contents
+* 📖 [Installation Guide](https://github.com/RustScan/RustScan#-full-installation-guide)
+* 🐋 [Docker Usage](https://github.com/RustScan/RustScan#docker-whale)
+* 🦜 [Discord](https://discord.gg/GFrQsGy)
+* 🤸 [Usage](https://github.com/RustScan/RustScan#-usage)
+* 🎪 [Community](https://github.com/RustScan/RustScan#-community)
 
 # 🔭 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?
@@ -66,22 +91,6 @@ Why spend time running fast scans and manually copying the ports, or waiting for
 | Actually useful                                                                            | ❌        | ✅    | ❌       |
 | Realises it's not useful, and pipes the only useful data into the only useful port scanner | ✅        | ❌    | ❌       |
 
-
-## 🙋 FAQ
-> I think this would be a great port scanner on its own without Nmap!
-
-No. If you want a fast port scanner, use Masscan.
-> I have this great idea for a script to get information on ports / hosts
-
-Great. Contribute it to Nmap! :D
-> Not everyone has nmap installed....
-
-If you're a pentester, then yes, you have Nmap installed. 
-
-> I want to contribute!
-
-Great! I'd love some help with this. Read the [contributing.md file](contributing.md) file for more information!
-
 # 📖 Full Installation Guide
 **You need Nmap**. If you have Kali Linux or Parrot OS installed, you already have Nmap. If not, [follow the nmap install guide](https://nmap.org/download.html).
 
@@ -91,25 +100,56 @@ 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](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!
+Run the commpand `dpkg -i` on the file. 
 
-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/`
+Note: sometimes you can double click the file to achieve the same result.
+
+## Docker :whale:
+
+Docker is the recommended way of installing RustScan. This is because:
+* It has a high open file descriptor limit, which is one of the [main problems](https://github.com/RustScan/RustScan/issues/40) with RustScan. Now you don't have to fiddle around trying to understand your OS.
+* It works on all systems, regardless of OS. Even Windows, which we don't officially support.
+* The Docker image uses the latest build from Cargo, our main source-of-truth package. This means that you will always be using the latest version.
+* No need to install Rust, Cargo, or Nmap.
+
+To install Docker, [follow their guide](https://docs.docker.com/engine/install/).
+
+**Once Docker is installed, run this command against the IP you want to target.**
+
+```
+docker run -it --rm --name rustscan cmnatic/rustscan:debian-buster rustscan 127.0.0.1
+```
+
+Note: this will scan the Docker's localhost, not your own.
+
+This will download the Docker image. 
+
+Once done, you will no longer need to re-download the image (except when RustScan updates) and can use RustScan like a normal application.
+
+You will have to run this command every time, so we suggest aliasing it to something memorable.
+
+```
+alias rustscan='docker run -it --rm --name rustscan cmnatic/rustscan:debian-buster rustscan'
+```
+
+Then we can:
+
+```
+rustscan 127.0.0.1 -t 500 -b 1500 -- -A
+```
 
 ## 🍺 HomeBrew
 
+**Note for Mac users** Mac OS has a very, very small ulimit size. This will negatively impact RustScan by a significant amount. Please use the Docker container, or tell RustScan to up the ulimit size on every run.
+
 Tap the brew:
 
 ```
@@ -130,6 +170,15 @@ brew install rustscan
 4. The binary is located at `target/release/rustscan`
 5. Symlink to the binary or something. Whatever you want!
 
+## 🦊 Community Distributions
+Here are all of RustScan's community distributions.
+
+If you maintain a community distribution and want it listed here, leave an issue / pull request / Discord message or however you want to let us know.
+
+* [OpenSuse](https://software.opensuse.org/package/rustscan?search_term=rustscan)
+
+[![Packaging status](https://repology.org/badge/vertical-allrepos/rustscan.svg)](https://repology.org/project/rustscan/versions)
+
 # 🤸 Usage
 
 ```
@@ -140,12 +189,15 @@ rustscan -h
 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 [OPTIONS] <ip> [command]...
+    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:
@@ -153,6 +205,7 @@ OPTIONS:
     -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
@@ -240,7 +293,7 @@ To run your own nmap commands, end the RustScan command with `-- -A` where `--`
 
 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
@@ -255,16 +308,48 @@ To increase accuracy, the easiest way is to increase the timeout. The default is
 
 Decreasing accuracy gives some speed bonus, but my testing found that batch size dramatically changed the speed whereas timeout did, but not so much.
 
-# 🎪 Contributing
+# 🎪 Community
+
+Howdy Space Cow-Person 🤠🌌
+
+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).
+
+TL;DR if you abuse members of our community you will be **perma-banned** 🤗
+
+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
+
+We communicate over Discord. [Click here](https://discord.gg/GFrQsGy) to join our Discord community!
+
+## Rewarding you
+I cannot pay you :-( But, I can place your GitHub profile on the README under `#Contributors` as a thank you! :)
+
+
 Please read the [contributing.md file](contributing.md)
 
-# 💻 Other Hacking Projects By This Author
-## 🧮 Ciphey
-Ciphey is an automated decryption tool using artifical intelligence & natural language processing.
-[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-3-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-7-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)):
@@ -274,9 +359,14 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 <!-- markdownlint-disable -->
 <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://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/RustScan/RustScan/commits?author=brandonskerritt" title="Tests">⚠️</a> <a href="https://github.com/RustScan/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/RustScan/RustScan/commits?author=SakiiR" title="Code">💻</a> <a href="https://github.com/RustScan/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/RustScan/RustScan/commits?author=bernardoamc" title="Code">💻</a> <a href="https://github.com/RustScan/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/RustScan/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/RustScan/RustScan/issues?q=author%3Aimlonghao" title="Bug reports">🐛</a> <a href="#maintenance-imlonghao" title="Maintenance">🚧</a></td>
+    <td align="center"><a href="https://github.com/Atul9"><img src="https://avatars1.githubusercontent.com/u/3390330?v=4" width="100px;" alt=""/><br /><sub><b>Atul Bhosale</b></sub></a><br /><a href="https://github.com/RustScan/RustScan/commits?author=Atul9" title="Documentation">📖</a></td>
+    <td align="center"><a href="https://github.com/royharoush"><img src="https://avatars3.githubusercontent.com/u/8113056?v=4" width="100px;" alt=""/><br /><sub><b>royharoush</b></sub></a><br /><a href="#ideas-royharoush" title="Ideas, Planning, & Feedback">🤔</a> <a href="#design-royharoush" title="Design">🎨</a></td>
   </tr>
 </table>
 

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! :)

src/main.rs

@@ -1,292 +1,366 @@
-use async_std::io;
-use async_std::net::TcpStream;
-use clap::{App, Arg, AppSettings};
-use colored::*;
-use std::process::{exit, Command};
-use std::time::Duration;
-use std::{
-    net::{SocketAddr, Shutdown},
-    io::ErrorKind, convert::TryInto,
-};
-use async_std::prelude::*;
-use futures::stream::FuturesUnordered;
+extern crate shell_words;
+
+mod tui;
+
+mod scanner;
+use scanner::Scanner;
+
+use colorful::Color;
+use colorful::Colorful;
 use futures::executor::block_on;
 use rlimit::Resource;
-use rlimit::{setrlimit, getrlimit};
+use rlimit::{getrlimit, setrlimit};
+use std::collections::HashMap;
+use std::process::Command;
+use std::{net::IpAddr, time::Duration};
+use structopt::StructOpt;
+
+extern crate colorful;
+extern crate dirs;
+
+const LOWEST_PORT_NUMBER: u16 = 1;
+const TOP_PORT_NUMBER: u16 = 65535;
+// Average value for Ubuntu
+const DEFAULT_FILE_DESCRIPTORS_LIMIT: rlimit::rlim = 8000;
+// Safest batch size based on experimentation
+const AVERAGE_BATCH_SIZE: rlimit::rlim = 3000;
+
+#[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.
+/// - Discord https://discord.gg/GFrQsGy
+/// - GitHub https://github.com/RustScan/RustScan
+struct Opts {
+    /// A list of comma separated IP addresses to be scanned.
+    #[structopt(use_delimiter = true, parse(try_from_str), required = true)]
+    ips: Vec<IpAddr>,
+
+    ///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: u16,
+
+    /// The timeout in milliseconds before a port is assumed to be closed.
+    #[structopt(short, long, default_value = "1500")]
+    timeout: u32,
+
+    /// Automatically ups the ULIMIT with the value you provided.
+    #[structopt(short, long)]
+    ulimit: Option<rlimit::rlim>,
+
+    /// 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)'\"")
+    #[structopt(last = true)]
+    command: Vec<String>,
+}
+
+#[cfg(not(tarpaulin_include))]
 /// 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\nWARNING Do not use this program against sensitive infrastructure. The specified server may not be able to handle this many socket connections at once.")
-        .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("q")
-            .short("-q")
-            .long("quiet")
-            .takes_value(false)
-            .help("Quiet mode. Only output the ports. No Nmap. Useful for grep or outputting to a file."))
-        .arg(Arg::with_name("u")
-            .short("u")
-            .long("ulimit")
-            .help("Automatically ups the ULIMIT with the value you provided.")
-            .takes_value(true))
-        .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();
+    env_logger::init();
 
-    
-    let ip = matches.value_of("ip").unwrap_or("None");
-    let ulimit_arg = matches.value_of("u").unwrap_or("None");
-    let quiet = if matches.is_present("q") { true } else { false };
-    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 opts = Opts::from_args();
+    info!("Mains() `opts` arguments are {:?}", opts);
 
-    };
-
-    let mut batch_size: u64 = matches
-                        .value_of("b")
-                        .unwrap_or("None")
-                        .parse::<u64>()
-                        .unwrap();
-    
-    if !quiet {
+    if !opts.quiet {
         print_opening();
     }
-    
-    // checks ulimit
-    
-    // change ulimit size
-    if !(ulimit_arg == "None") {
-        let limit = ulimit_arg.parse::<u64>().unwrap();
-        if !quiet{
-            println!("Automatically upping ulimit to {}", ulimit_arg);
-        }
-        setrlimit(Resource::NOFILE, limit, limit);
-    }
 
-    let (x, _) = getrlimit(Resource::NOFILE).unwrap(); 
+    let ulimit: rlimit::rlim = adjust_ulimit_size(&opts);
+    let batch_size: u16 = infer_batch_size(&opts, ulimit);
 
-    // if maximum limit is lower than batch size
-    // automatically re-adjust the batch size
-    if x < batch_size.into() {
-        if !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());
-            // TODO this is a joke please fix
-
-            // 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{
-                batch_size = 3000
-            }
-            else {
-                let ten: u64 = 100;
-                batch_size = x - ten;
-            }
-        }
-    }
-    // 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 > batch_size.into() && (ulimit_arg == "None"){
-        if !quiet{
-            // TODO this is a joke please fix
-            let one: u64 = 1;
-            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 - one);
-        }
-    }
-    // the user has asked to automatically up the ulimit
-
-                            
-    // 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.try_into().unwrap(), quiet);
-    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 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());
-    }
-
-    // Tells the user we are now switching to Nmap
-    if !quiet{
-        println!(
-            "{}",
-            "Starting nmap.".blue(),
-        );
-    }
-
-
-    // nmap port style is 80,443. Comma seperated with no spaces.
-    let ports_str = nmap_str_ports.join(",");
-
-    // if quiet mode is on, return ports and exit
-    if quiet{
-        println!("{:?}", ports_str);
-        exit(1);
-    }
-
-    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>>();
-
-    // Runs the nmap command and spawns it as a process.
-    Command::new("nmap")
-        .args(&vec)
-        .spawn()
-        .expect("failed to execute process");
-}
-
-pub async fn run_batched(
-    host: String,
-    port_start: u32,
-    port_end: u32,
-    timeout: Duration,
-    batch: u32,
-    quiet: bool,
-) -> 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, quiet).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,
-    quiet: bool,
-) -> 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, quiet));
-    }
-
-    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, quiet: bool) -> 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) {
-                    _ => {}
-                }
-                if !quiet {
-                    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)
-}
-
-fn print_opening() {
-    let s = "
-     _____           _    _____                 
-    |  __ \\         | |  / ____|                
-    | |__) |   _ ___| |_| (___   ___ __ _ _ __  
-    |  _  / | | / __| __|\\___ \\ / __/ _` | '_ \\ 
-    | | \\ \\ |_| \\__ \\ |_ ____) | (_| (_| | | | |
-    |_|  \\_\\__,_|___/\\__|_____/ \\___\\__,_|_| |_|
-    Faster nmap scanning with rust.";
-    println!(
-        "{} \n {} \n {}",
-        s.green(),
-        "Automated Decryption Tool - https://github.com/ciphey/ciphey".green(),
-        "Creator https://github.com/brandonskerritt".green()
+    let scanner = Scanner::new(
+        &opts.ips,
+        LOWEST_PORT_NUMBER,
+        TOP_PORT_NUMBER,
+        batch_size,
+        Duration::from_millis(opts.timeout.into()),
+        opts.quiet,
     );
+
+    let scan_result = block_on(scanner.run());
+    let mut ports_per_ip = HashMap::new();
+
+    for socket in scan_result {
+        ports_per_ip
+            .entry(socket.ip())
+            .or_insert_with(Vec::new)
+            .push(socket.port());
+    }
+
+    for ip in opts.ips {
+        if ports_per_ip.contains_key(&ip) {
+            continue;
+        }
+
+        // If we got here it means the IP was not found within the HashMap, this
+        // means the scan couldn't find any open ports for it.
+        if opts.quiet {
+            let x = format!("{} {:?}", "No ports found for", ip);
+            detail!(x);
+        } else {
+            let x = format!("{} Looks like I didn't find any open ports for {:?}. This is usually caused by a high batch size.
+            \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.\n",
+            "ERROR",
+            ip,
+            opts.batch_size,
+            (opts.batch_size / 2).to_string(),
+            "'rustscan -b <batch_size> <ip address>'");
+            warning!(x);
+        }
+    }
+
+    for (ip, ports) in ports_per_ip.iter_mut() {
+        let nmap_str_ports: Vec<String> = ports.into_iter().map(|port| port.to_string()).collect();
+
+        if !opts.quiet {
+            println!("\n");
+            detail!("Starting Nmap");
+        }
+
+        // nmap port style is 80,443. Comma separated with no spaces.
+        let ports_str = nmap_str_ports.join(",");
+
+        // if quiet mode is on nmap should not be spawned
+        if opts.quiet {
+            detail!(format!("Ports: {:?}", ports_str));
+            continue;
+        }
+
+        let addr = ip.to_string();
+        let user_nmap_args =
+            shell_words::split(&opts.command.join(" ")).expect("failed to parse nmap arguments");
+        let nmap_args = build_nmap_arguments(&addr, &ports_str, &user_nmap_args, ip.is_ipv6());
+
+        output!(format!(
+            "The Nmap command to be run is nmap {}\n",
+            &nmap_args.join(" ")
+        ));
+
+        // Runs the nmap command and spawns it as a process.
+        let mut child = Command::new("nmap")
+            .args(&nmap_args)
+            .spawn()
+            .expect("failed to execute nmap process");
+
+        child.wait().expect("failed to wait on nmap process");
+    }
+}
+
+/// Prints the opening title of RustScan
+fn print_opening() {
+    info!("Printing opening");
+    let s = r#".----. .-. .-. .----..---.  .----. .---.   .--.  .-. .-.
+| {}  }| { } |{ {__ {_   _}{ {__  /  ___} / {} \ |  `| |
+| .-. \| {_} |.-._} } | |  .-._} }\     }/  /\  \| |\  |
+`-' `-'`-----'`----'  `-'  `----'  `---' `-'  `-'`-' `-'
+Faster Nmap scanning with Rust."#;
+    println!("{}", s.gradient(Color::Green).bold());
+    let info = r#"________________________________________
+: https://discord.gg/GFrQsGy           :
+: https://github.com/RustScan/RustScan :
+ --------------------------------------"#;
+    println!("{}\n", info.gradient(Color::Red).bold());
+
+    let config_path = match dirs::config_dir() {
+        Some(mut path) => {
+            path.push("rustscan");
+            path.push("config.toml");
+            path
+        }
+        None => panic!("Couldn't find config dir."),
+    };
+
+    detail!(format!(
+        "{} {:?}",
+        "The config file is expected to be at", config_path
+    ));
+}
+#[cfg(not(tarpaulin_include))]
+fn build_nmap_arguments<'a>(
+    addr: &'a str,
+    ports: &'a str,
+    user_args: &'a Vec<String>,
+    is_ipv6: bool,
+) -> Vec<&'a str> {
+    let mut arguments: Vec<&str> = user_args.iter().map(AsRef::as_ref).collect();
+    arguments.push("-A");
+    arguments.push("-vvv");
+
+    if is_ipv6 {
+        arguments.push("-6");
+    }
+
+    arguments.push("-p");
+    arguments.push(ports);
+    arguments.push(addr);
+
+    arguments
+}
+
+fn adjust_ulimit_size(opts: &Opts) -> rlimit::rlim {
+    if opts.ulimit.is_some() {
+        let limit: rlimit::rlim = opts.ulimit.unwrap();
+
+        match setrlimit(Resource::NOFILE, limit, limit) {
+            Ok(_) => {
+                if !opts.quiet {
+                    detail!(format!(
+                        "Automatically increasing ulimit value to {}.",
+                        limit
+                    ));
+                }
+            }
+            Err(_) => println!("{}", "ERROR. Failed to set ulimit value."),
+        }
+    }
+
+    let (rlim, _) = getrlimit(Resource::NOFILE).unwrap();
+
+    rlim
+}
+
+fn infer_batch_size(opts: &Opts, ulimit: rlimit::rlim) -> u16 {
+    let mut batch_size: rlimit::rlim = opts.batch_size.into();
+
+    // Adjust the batch size when the ulimit value is lower than the desired batch size
+    if ulimit < batch_size {
+        if !opts.quiet {
+            warning!("File limit is lower than default batch size. Consider upping with --ulimt. May cause harm to sensitive servers");
+        }
+
+        // When the OS supports high file limits like 8000, but the user
+        // selected a batch size higher than this we should reduce it to
+        // a lower number.
+        if ulimit < AVERAGE_BATCH_SIZE {
+            // ulimit is smaller than aveage batch size
+            // user must have very small ulimit
+            // decrease batch size to half of ulimit
+            warning!("Your file limit is very small, which negatively impacts RustScan's speed. Use the Docker image, or up the Ulimt with '--ulimt 5000'. ");
+            info!("Halving batch_size because ulimit is smaller than average batch size");
+            batch_size = ulimit / 2
+        } else if ulimit > DEFAULT_FILE_DESCRIPTORS_LIMIT {
+            info!("Batch size is now average batch size");
+            batch_size = AVERAGE_BATCH_SIZE
+        } else {
+            batch_size = ulimit - 100
+        }
+    }
+    // When the ulimit is higher than the batch size let the user know that the
+    // batch size can be increased unless they specified the ulimit themselves.
+    else if ulimit + 2 > batch_size && (opts.ulimit.is_none()) {
+        if !opts.quiet {
+            detail!(format!(
+                "File limit higher than batch size. Can increase speed by increasing batch size '-b {}'.",
+                ulimit - 100
+            ));
+        }
+    }
+
+    batch_size as u16
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{adjust_ulimit_size, infer_batch_size, print_opening, Opts};
+    use std::{net::IpAddr, str::FromStr};
+
+    #[test]
+    fn batch_size_lowered() {
+        let opts = Opts {
+            ips: vec![IpAddr::from_str("127.0.0.1").unwrap()],
+            quiet: true,
+            batch_size: 50_000,
+            timeout: 1_000,
+            ulimit: Some(2_000),
+            command: Vec::new(),
+        };
+        let batch_size = infer_batch_size(&opts, 120);
+
+        assert!(batch_size < 50_000);
+    }
+
+    #[test]
+    fn batch_size_lowered_average_size() {
+        let opts = Opts {
+            ips: vec![IpAddr::from_str("127.0.0.1").unwrap()],
+            quiet: true,
+            batch_size: 50_000,
+            timeout: 1_000,
+            ulimit: Some(2_000),
+            command: Vec::new(),
+        };
+        let batch_size = infer_batch_size(&opts, 9_000);
+
+        assert!(batch_size == 3_000);
+    }
+    #[test]
+    fn batch_size_equals_ulimit_lowered() {
+        // because ulimit and batch size are same size, batch size is lowered
+        // to ULIMIT - 100
+        let opts = Opts {
+            ips: vec![IpAddr::from_str("127.0.0.1").unwrap()],
+            quiet: true,
+            batch_size: 50_000,
+            timeout: 1_000,
+            ulimit: Some(2_000),
+            command: Vec::new(),
+        };
+        let batch_size = infer_batch_size(&opts, 5_000);
+
+        assert!(batch_size == 4_900);
+    }
+    #[test]
+    fn batch_size_adjusted_2000() {
+        // ulimit == batch_size
+        let opts = Opts {
+            ips: vec![IpAddr::from_str("127.0.0.1").unwrap()],
+            quiet: true,
+            batch_size: 50_000,
+            timeout: 1_000,
+            ulimit: Some(2_000),
+            command: Vec::new(),
+        };
+        let batch_size = adjust_ulimit_size(&opts);
+
+        assert!(batch_size == 2_000);
+    }
+    #[test]
+    fn test_print_opening_no_panic() {
+        // print opening should not panic
+        print_opening();
+        assert!(1 == 1);
+    }
+    #[test]
+    fn test_high_ulimit_no_quiet_mode() {
+        let opts = Opts {
+            ips: vec![IpAddr::from_str("127.0.0.1").unwrap()],
+            quiet: false,
+            batch_size: 10,
+            timeout: 1_000,
+            ulimit: None,
+            command: Vec::new(),
+        };
+
+        infer_batch_size(&opts, 1_000_000);
+
+        assert!(1 == 1);
+    }
 }

src/scanner/mod.rs

@@ -0,0 +1,203 @@
+mod range_iterator;
+use range_iterator::RangeIterator;
+
+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.
+#[cfg(not(tarpaulin_include))]
+pub struct Scanner {
+    hosts: Vec<IpAddr>,
+    start: u16,
+    end: u16,
+    batch_size: u16,
+    timeout: Duration,
+    quiet: bool,
+}
+
+impl Scanner {
+    pub fn new(
+        hosts: &[IpAddr],
+        start: u16,
+        end: u16,
+        batch_size: u16,
+        timeout: Duration,
+        quiet: bool,
+    ) -> Self {
+        Self {
+            start,
+            end,
+            batch_size,
+            timeout,
+            quiet,
+            hosts: hosts.iter().map(|host| host.to_owned()).collect(),
+        }
+    }
+
+    /// 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<SocketAddr> {
+        let range_iterator = RangeIterator::new(self.start.into(), self.end.into());
+        let mut sockets: Vec<SocketAddr> = Vec::new();
+        let mut open_sockets: Vec<SocketAddr> = Vec::new();
+
+        for port in range_iterator {
+            for host in &self.hosts {
+                sockets.push(SocketAddr::new(*host, port));
+            }
+
+            if sockets.len() >= self.batch_size.into() {
+                let mut results = self.scan_range(&sockets).await;
+                open_sockets.append(&mut results);
+                sockets = Vec::new();
+            }
+        }
+
+        // This will happen if we have a number of sockets remaining
+        // that is lower than the batch size.
+        if !sockets.is_empty() {
+            let mut results = self.scan_range(&sockets).await;
+            open_sockets.append(&mut results);
+        }
+
+        open_sockets
+    }
+
+    /// Given a slice of sockets, scan them all.
+    /// Returns a vector of open sockets.
+    async fn scan_range(&self, sockets: &[SocketAddr]) -> Vec<SocketAddr> {
+        let mut ftrs = FuturesUnordered::new();
+        for socket in sockets {
+            ftrs.push(self.scan_socket(socket));
+        }
+
+        let mut open_sockets: Vec<SocketAddr> = Vec::new();
+        while let Some(result) = ftrs.next().await {
+            match result {
+                Ok(socket) => open_sockets.push(socket),
+                _ => {}
+            }
+        }
+
+        open_sockets
+    }
+
+    /// 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
+    ///
+    ///     self.scan_port(10:u16)
+    ///
+    /// Note: `self` must contain `self.host`.
+    async fn scan_socket(&self, socket: &SocketAddr) -> io::Result<SocketAddr> {
+        match self.connect(*socket).await {
+            Ok(x) => {
+                // match stream_result.shutdown(Shutdown::Both)
+                info!("Shutting down stream");
+                match x.shutdown(Shutdown::Both) {
+                    _ => {}
+                }
+                if !self.quiet {
+                    println!("Open {}", socket.to_string().purple());
+                }
+
+                Ok(*socket)
+            }
+            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
+    ///
+    ///     let port: u16 = 80
+    ///     // Host is an IpAddr type
+    ///     let host = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
+    ///     let socket = SocketAddr::new(host, port);
+    ///     self.connect(socket)
+    ///     // returns Result which is either Ok(stream) for port is open, or Er for port is closed.
+    ///     // Timeout occurs after self.timeout seconds
+    ///
+    async fn connect(&self, socket: SocketAddr) -> io::Result<TcpStream> {
+        let stream = io::timeout(
+            self.timeout,
+            async move { TcpStream::connect(socket).await },
+        )
+        .await?;
+        Ok(stream)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use async_std::task::block_on;
+    use std::{net::IpAddr, time::Duration};
+
+    #[test]
+    fn scanner_runs() {
+        // Makes sure the program still runs and doesn't panic
+        let addrs = vec!["127.0.0.1".parse::<IpAddr>().unwrap()];
+        let scanner = Scanner::new(&addrs, 1, 1_000, 10, Duration::from_millis(100), true);
+        block_on(scanner.run());
+        // if the scan fails, it wouldn't be able to assert_eq! as it panicked!
+        assert_eq!(1, 1);
+    }
+    #[test]
+    fn ipv6_scanner_runs() {
+        // Makes sure the program still runs and doesn't panic
+        let addrs = vec!["::1".parse::<IpAddr>().unwrap()];
+        let scanner = Scanner::new(&addrs, 1, 1_000, 10, Duration::from_millis(100), false);
+        block_on(scanner.run());
+        // if the scan fails, it wouldn't be able to assert_eq! as it panicked!
+        assert_eq!(1, 1);
+    }
+    #[test]
+    fn quad_zero_scanner_runs() {
+        let addrs = vec!["0.0.0.0".parse::<IpAddr>().unwrap()];
+        let scanner = Scanner::new(&addrs, 1, 1_000, 10, Duration::from_millis(500), true);
+        block_on(scanner.run());
+        assert_eq!(1, 1);
+    }
+    #[test]
+    fn google_dns_runs() {
+        let addrs = vec!["8.8.8.8".parse::<IpAddr>().unwrap()];
+        let scanner = Scanner::new(&addrs, 400, 445, 10, Duration::from_millis(1_500), true);
+        block_on(scanner.run());
+        assert_eq!(1, 1);
+    }
+    #[test]
+    fn infer_ulimit_lowering_no_panic() {
+        // Test behaviour on MacOS where ulimit is not automatically lowered
+        let addrs = vec!["8.8.8.8".parse::<IpAddr>().unwrap()];
+
+        // mac should have this automatically scaled down
+        let scanner = Scanner::new(&addrs, 400, 600, 10_000, Duration::from_millis(1500), true);
+        block_on(scanner.run());
+        assert_eq!(1, 1);
+    }
+}

src/scanner/range_iterator.rs

@@ -0,0 +1,129 @@
+use gcd::Gcd;
+use rand::Rng;
+
+pub struct RangeIterator {
+    normalized_end: u32,
+    normalized_first_pick: Option<u32>,
+    normalized_pick: Option<u32>,
+    actual_start: u32,
+    step: u32,
+}
+
+/// An iterator that follows the `Linear Congruential Generator` algorithm.
+///
+/// For more information: https://en.wikipedia.org/wiki/Linear_congruential_generator
+impl RangeIterator {
+    /// Receives the the start and end of a range and normalize
+    /// these values before selecting a coprime for the end of the range
+    /// which will server as the step for the algorithm.
+    ///
+    /// For example, the range `1000-2500` will be normalized to `0-1500`
+    /// before going through the algorithm.
+    pub fn new(start: u32, end: u32) -> Self {
+        let normalized_end = end - start;
+        let step = pick_random_coprime(normalized_end);
+
+        Self {
+            normalized_end,
+            step,
+            normalized_first_pick: None,
+            normalized_pick: None,
+            actual_start: start,
+        }
+    }
+}
+
+impl Iterator for RangeIterator {
+    type Item = u16;
+
+    // The next step is always bound by the formula: N+1 = (N + STEP) % TOP_OF_THE_RANGE
+    // It will only stop once we generate a number equal to the first generated number.
+    fn next(&mut self) -> Option<Self::Item> {
+        // Randomly choose a number within the range to be the first
+        // and assign it as a pick.
+        if self.normalized_first_pick.is_none() {
+            let mut rng = rand::thread_rng();
+            let normalized_first_pick = rng.gen_range(0, self.normalized_end);
+
+            self.normalized_first_pick = Some(normalized_first_pick);
+            self.normalized_pick = Some(normalized_first_pick);
+            return Some((self.actual_start + normalized_first_pick) as u16);
+        }
+
+        let current_pick = self.normalized_pick.unwrap();
+        let next_pick = (current_pick + self.step) % self.normalized_end;
+
+        // If the next pick is equal to the first pick this means that
+        // we have iterated through the entire range.
+        if next_pick == self.normalized_first_pick.unwrap() {
+            return None;
+        }
+
+        self.normalized_pick = Some(next_pick);
+        Some((self.actual_start + next_pick) as u16)
+    }
+}
+
+/// The probability that two random integers are coprime to one another
+/// works out to be around 61%, given that we can safely pick a random
+/// number and test it. Just in case we are having a bad day and we cannot
+/// pick a coprime number after 10 tries we just return "end - 1" which
+/// is guaranteed to be a coprime, but won't provide ideal randomization.
+///
+/// We pick between "lower_range" and "upper_range" since values too close to
+/// the boundaries, which in these case are the "start" and "end" arguments
+/// would also provide non-ideal randomization as discussed on the paragraph
+/// above.
+fn pick_random_coprime(end: u32) -> u32 {
+    let range_boundary = end / 4;
+    let lower_range = range_boundary;
+    let upper_range = end - range_boundary;
+    let mut rng = rand::thread_rng();
+    let mut candidate = rng.gen_range(lower_range, upper_range);
+
+    for _ in 0..10 {
+        if end.gcd(candidate) == 1 {
+            return candidate;
+        } else {
+            candidate = rng.gen_range(lower_range, upper_range);
+        }
+    }
+
+    end - 1
+}
+
+#[cfg(test)]
+mod tests {
+    use super::RangeIterator;
+
+    #[test]
+    fn range_iterator_iterates_through_the_entire_range() {
+        let result = generate_sorted_range(1, 10);
+        let expected_range = (1..10).into_iter().collect::<Vec<u16>>();
+        assert_eq!(expected_range, result);
+
+        let result = generate_sorted_range(1, 100);
+        let expected_range = (1..100).into_iter().collect::<Vec<u16>>();
+        assert_eq!(expected_range, result);
+
+        let result = generate_sorted_range(1, 1000);
+        let expected_range = (1..1000).into_iter().collect::<Vec<u16>>();
+        assert_eq!(expected_range, result);
+
+        let result = generate_sorted_range(1, 65_535);
+        let expected_range = (1..65_535).into_iter().collect::<Vec<u16>>();
+        assert_eq!(expected_range, result);
+
+        let result = generate_sorted_range(1000, 2000);
+        let expected_range = (1000..2000).into_iter().collect::<Vec<u16>>();
+        assert_eq!(expected_range, result);
+    }
+
+    fn generate_sorted_range(start: u32, end: u32) -> Vec<u16> {
+        let range = RangeIterator::new(start, end);
+        let mut result = range.into_iter().collect::<Vec<u16>>();
+        result.sort();
+
+        result
+    }
+}

src/tui.rs

@@ -0,0 +1,35 @@
+/// Terminal User Interface Module for RustScan
+/// Defines macros to use
+
+// TODO make them work with formatted strings
+
+#[macro_export]
+macro_rules! warning {
+    ($name:expr) => {
+        use ansi_term::Colour::Red;
+        if $name.len() > 200 {
+            panic!("Your warning is too long.")
+        }
+        println!("{} {}", Red.bold().paint("[!]"), $name);
+    };
+}
+
+#[macro_export]
+macro_rules! detail {
+    ($name:expr) => {
+        use ansi_term::Colour::Blue;
+        if $name.len() > 200 {
+            panic!("Your detail is too long.")
+        }
+        println!("{} {}", Blue.bold().paint("[~]"), $name);
+    };
+}
+
+#[macro_export]
+macro_rules! output {
+    ($name:expr) => {
+        use ansi_term::Colour::RGB;
+
+        println!("{} {}", RGB(0, 255, 9).bold().paint("[>]"), $name);
+    };
+}