Instalasi Go pada Ubuntu 18.04

Unduh Go terbaru dari situs resmi https://golang.org/dl/

wget -c https://dl.google.com/go/goX.Y.Z.linux-amd64.tar.gz -O /tmp/
sudo tar -C /usr/local -xzf /tmp/goX.Y.Z.linux-amd64.tar.gz

Atur PATH

export PATH=$PATH:/usr/local/go/bin

Buat direktorik Workspace

sudo mkdir /home/user/Programs/Go/

Buat program sederhana dengan Go

sudo vi /home/user/Programs/Go/hello.go

package main

import "fmt"

func main() {
   fmt.Println("Hello, World!")
}

Jalankan program

go run hello.go

Hello, World!

Instalasi Paket Go

Atur GOPATH

sudo vi /home/user/.bashrc

Tambahkan GOPATH

export GOPATH=/home/user/Programs/go

Aktifkan GOPATH

source /home/user/.bashrc &&
echo $GOPATH

/home/user/Programs/go

Atur GOBIN.

When you run go install Go looks for $GOBIN env variable path. Either you need to set your  $GOBIN to $GOPATH/bin

$ export GOBIN=$GOPATH/bin

and/or add $GOBIN to your OS search path

$ export PATH=$PATH:$GOBIN
To use the command without getting the error.

Atur hak kepemilikan

sudo chown user:user /home/user -R

Pasang Caddy guna compile binary Go.

sudo apt install git
go get -u github.com/mholt/caddy/caddy

Periksa Caddy

ls $GOPATH/bin

caddy

Build Manual Paket Go

Build Caddy jika tidak tersedia pada direktori $GOPATH/bin.

go build github.com/mholt/caddy/caddy &&
go build -o build/caddy-server github.com/mholt/caddy/caddy &&
go install github.com/mholt/caddy/caddy

Build Go Binary

Install Vim guna syntax highlight yang lebih baik

sudo apt install vim

Tulis script guna automate membangun binary Go.

cd $GOPATH &&
sudo vi build.sh

#!/usr/bin/env bash

package=$1
if [[ -z "$package" ]]; then
  echo "usage: $0 <package-name>"
  exit 1
fi
package_split=(${package//\// })
package_name=${package_split[-1]}

platforms=("linux/386" "linux/amd64")

for platform in "${platforms[@]}"
do
    platform_split=(${platform//\// })
    GOOS=${platform_split[0]}
    GOARCH=${platform_split[1]}
    output_name=$package_name'-'$GOOS'-'$GOARCH
    if [ $GOOS = "windows" ]; then
        output_name+='.exe'
    fi  

    env GOOS=$GOOS GOARCH=$GOARCH go build -o $output_name $package
    if [ $? -ne 0 ]; then
        echo 'An error has occurred! Aborting the script execution...'
        exit 1
    fi
done

Penggunaan dengan project Hello World

chmod a+x build.sh &&
go get -u github.com/go-training/helloworld &&
./build.sh github.com/go-training/helloworld &&
ls helloworld-linux-amd64 &&
file helloworld-linux-amd64 &&
./helloworld-linux-amd64

helloworld-linux-amd64: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, with debug_info, not stripped
Hello World!!

Reverse Engineering Go dengan Radare2

Install Radare2

sudo apt install radare2 -y

Buka Binary Go dengan Radare2

radare2 helloworld-linux-amd64

Analisis Binary Go

[x]> aaaa