gomap

What is gomap?

Gomap is a fully self-contained nmap like module for Golang. Unlike other projects which provide nmap C bindings or rely on other local dependencies, gomap is a fully implemented in pure Go. Gomap imports zero non-core modules making it ideal for applications that have zero control on the clients operating system. Since this is a small library, it only focuses on providing a few core features. For the most part its API is stable with changes being applied to its unexposed internal scanning functions.

Features

• Parallel port scanning using go routines
• Automated CIDR range scanning
• Service prediction by port number
• SYN (Silent) Scanning Mode
• UDP Scanning (Non-Stealth)
• Fast and detailed scanning for common ports
• Pure Go with zero dependencies
• Easily integrated into other projects

Upcoming Features

• CIDR range size detection

Example Usage - 1

Performs a fastscan for the most common ports on every IP on a local range

Create Files

1. Create quickscan.go

package main

import (
	"fmt"

	"github.com/JustinTimperio/gomap"
)

func main() {
	var (
		proto    = "tcp"
		fastscan = true
		syn      = false
	)

	scan, err := gomap.ScanRange(proto, fastscan, syn)
	if err != nil {
		// handle error
	}
	fmt.Printf(scan.String())
}

2. go mod init quickscan
3. go mod tidy
4. go run quickscan.go

Example Output

Host: computer-name (192.168.1.132)
        |     Port      Service
        |     ----      -------
        |---- 22        ssh
 
Host: server-nginx (192.168.1.143)
        |     Port      Service
        |     ----      -------
        |---- 443       https
        |---- 80        http
        |---- 22        ssh
 
Host: server-minio (192.168.1.112)
        |     Port      Service
        |     ----      -------
        |---- 22        ssh

Host: some-phone (192.168.1.155)
        |- No Open Ports

Example Usage - 2

Performs a detailed stealth scan on a single IP

Create Files

1. Create stealthmap.go

package main

import (
	"fmt"

	"github.com/JustinTimperio/gomap"
)

func main() {
	// Stealth scans MUST be run as root/admin
	var (
		fastscan = false
		syn      = true
		proto    = "tcp"
		ip       = "192.168.1.120"
	)

	scan, err := gomap.ScanIP(ip, proto, fastscan, syn)
	if err != nil {
		// handle error
	}
	fmt.Printf(scan.String())
}

2. go mod init stealthmap
3. go mod tidy
4. sudo go run stealthmap.go

Example Output

Host: 192.168.1.120 | Ports Scanned 3236/3236
Host: Voyager (192.168.1.120)
        |     Port      Service
        |     ----      -------
        |---- 22        SSH Remote Login Protocol
        |---- 80        World Wide Web HTTP
        |---- 443       HTTP protocol over TLS/SSL