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package main
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"golang.org/x/crypto/ssh"
)
// remote PODMAN_HOST=ssh://<user>@<host>[:port]/run/podman/podman.sock
// local PODMAN_HOST=unix://run/podman/podman.sock
var (
DefaultURL = "unix://root@localhost/run/podman/podman.sock"
)
func main() {
connectionURL := DefaultURL
if value, found := os.LookupEnv("PODMAN_HOST"); found {
connectionURL = value
}
_url, err := url.Parse(connectionURL)
if err != nil {
die("Value of PODMAN_HOST is not a valid url: %s\n", connectionURL)
}
if _url.Scheme != "ssh" && _url.Scheme != "unix" {
die("Scheme from PODMAN_HOST is not supported: %s\n", _url.Scheme)
}
// Now we setup the http client to use the connection above
client := &http.Client{}
if _url.Scheme == "ssh" {
var auth ssh.AuthMethod
if value, found := os.LookupEnv("PODMAN_SSHKEY"); found {
auth, err = publicKey(value)
if err != nil {
die("Failed to parse %s: %v\n", value, err)
}
} else {
die("PODMAN_SSHKEY was not defined\n")
}
// Connect to sshd
bastion, err := ssh.Dial("tcp",
net.JoinHostPort(_url.Hostname(), _url.Port()),
&ssh.ClientConfig{
User: _url.User.Username(),
Auth: []ssh.AuthMethod{auth},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
},
)
if err != nil {
die("Failed to build ssh tunnel")
}
defer bastion.Close()
client.Transport = &http.Transport{
DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
// Now we make the connection to the unix domain socket on the server using the ssh tunnel
return bastion.Dial("unix", _url.Path)
},
}
} else {
client.Transport = &http.Transport{
DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
d := net.Dialer{}
return d.DialContext(ctx, "unix", _url.Path)
},
DisableCompression: true,
}
}
resp, err := client.Get("http://localhost/v1.24/images/json")
if err != nil {
die(err.Error())
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
var output bytes.Buffer
_ = json.Indent(&output, body, "", " ")
fmt.Printf("%s\n", output.String())
os.Exit(0)
}
func die(format string, a ...interface{}) {
fmt.Fprintf(os.Stderr, format, a...)
fmt.Fprintf(os.Stderr, "\n")
os.Exit(1)
}
func publicKey(path string) (ssh.AuthMethod, error) {
key, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
signer, err := ssh.ParsePrivateKey(key)
if err != nil {
return nil, err
}
return ssh.PublicKeys(signer), nil
}
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