/
remote.go
120 lines (112 loc) · 2.46 KB
/
remote.go
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package browser
import (
"bytes"
"errors"
"fmt"
"log"
"net"
"os"
"os/exec"
"os/user"
"strings"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
var (
errNoRemote = errors.New("can't find remote address")
)
func shellJoin(cmd string, args []string) string {
if len(args) > 0 {
values := make([]string, len(args))
for ii, v := range args {
if strings.Contains(v, " ") {
values[ii] = fmt.Sprintf("\"%s\"", strings.Replace(v, "\"", "\\\"", -1))
} else {
values[ii] = v
}
}
added := strings.Join(values, " ")
if added != "" {
return cmd + " " + added
}
}
return cmd
}
func runRemoteCmd(client *ssh.Client, cmd string, args ...string) (string, error) {
session, err := client.NewSession()
if err != nil {
return "", fmt.Errorf("failed to create session: %s", err)
}
defer session.Close()
var out bytes.Buffer
session.Stdout = &out
session.Stderr = &out
fullCmd := shellJoin(cmd, args)
if err := session.Run(fullCmd); err != nil {
return "", fmt.Errorf("failed to run %s: %s", fullCmd, err)
}
return out.String(), nil
}
func openRemoteBrowser(url string) error {
sshClient := os.Getenv("SSH_CLIENT")
parts := strings.Split(sshClient, " ")
if parts[0] == "" {
return errNoRemote
}
usr, err := user.Current()
if err != nil {
return err
}
var auth []ssh.AuthMethod
if sock := os.Getenv("SSH_AUTH_SOCK"); sock != "" {
conn, err := net.Dial("unix", sock)
if err != nil {
log.Printf("error connecting to SSH_AUTH_SOCK: %v", err)
}
if conn != nil {
sshAgent := agent.NewClient(conn)
signers, err := sshAgent.Signers()
if err != nil {
log.Printf("error getting ssh agent signers: %v", err)
}
if len(signers) > 0 {
auth = append(auth, ssh.PublicKeys(signers...))
}
}
}
config := &ssh.ClientConfig{
User: usr.Username,
Auth: auth,
}
client, err := ssh.Dial("tcp", parts[0]+":22", config)
if err != nil {
return err
}
defer client.Close()
out, err := runRemoteCmd(client, "uname", "-s")
if err != nil {
return err
}
cmds, err := goosCmds(strings.ToLower(strings.TrimSpace(out)))
if err != nil {
return err
}
for _, cmd := range cmds {
if len(cmd) == 0 || cmd[0] == "" {
// Should not happen, but...
continue
}
_, err = exec.LookPath(cmd[0])
if err == nil {
var args []string
args = append(args, cmd[1:]...)
args = append(args, url)
_, err = runRemoteCmd(client, cmd[0], args...)
}
if err == nil {
// Browser did open
break
}
}
return nil
}