brianredbeard/Dockerfile-c

## Dockerfile-c
FROM scratch

ADD ghbn /ghbn

CMD ["/ghbn", "example.com"]

## Dockerfile-go
FROM scratch

ADD ghbn-go /ghbn

CMD ["/ghbn", "example.com"]

## ghbn.c
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>

//
// gcc -static -ggdb -Wall -Wextra -Wpedantic -o ghbn ghbn.c
//

int main(int argc, char * argv[]) {
	if (argc!=2) {
		exit(1);
	}

	struct hostent *hosts;
	struct in_addr *address;
	hosts = gethostbyname(argv[1]);
	address = (struct in_addr *) (hosts->h_addr);
	printf("%s\n",inet_ntoa(*address));

}

## ghbn.go
package main

//
// go build -o ghbn-go ghbn.go
//

import (
        "fmt"
        "net"
        "os"
)

func main() {
        hostname := os.Args[1]
        addrs, err := net.LookupHost(hostname)
        if err != nil {
                fmt.Print("Error resolving ", hostname)
                os.Exit(1)
        }
        for _, v := range addrs {
                fmt.Print(v)
                fmt.Print("\n")
        }
}
	#include <arpa/inet.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <netdb.h>

	//
	// gcc -static -ggdb -Wall -Wextra -Wpedantic -o ghbn ghbn.c
	//

	int main(int argc, char * argv[]) {
	if (argc!=2) {
	exit(1);
	}

	struct hostent *hosts;
	struct in_addr *address;
	hosts = gethostbyname(argv[1]);
	address = (struct in_addr *) (hosts->h_addr);
	printf("%s\n",inet_ntoa(*address));

	}
	package main

	//
	// go build -o ghbn-go ghbn.go
	//

	import (
	"fmt"
	"net"
	"os"
	)

	func main() {
	hostname := os.Args[1]
	addrs, err := net.LookupHost(hostname)
	if err != nil {
	fmt.Print("Error resolving ", hostname)
	os.Exit(1)
	}
	for _, v := range addrs {
	fmt.Print(v)
	fmt.Print("\n")
	}
	}