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ssh.go
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ssh.go
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package application
import (
"fmt"
"os"
"time"
"golang.org/x/crypto/ssh"
"github.com/cloudfoundry/cli/cf/command_registry"
"github.com/cloudfoundry/cli/cf/commands"
"github.com/cloudfoundry/cli/cf/configuration/core_config"
. "github.com/cloudfoundry/cli/cf/i18n"
"github.com/cloudfoundry/cli/cf/net"
"github.com/cloudfoundry/cli/cf/requirements"
sshCmd "github.com/cloudfoundry/cli/cf/ssh"
"github.com/cloudfoundry/cli/cf/ssh/options"
"github.com/cloudfoundry/cli/cf/ssh/terminal"
"github.com/cloudfoundry/cli/cf/terminal"
"github.com/simonleung8/flags"
"github.com/simonleung8/flags/flag"
)
type SSH struct {
ui terminal.UI
config core_config.Reader
gateway net.Gateway
appReq requirements.ApplicationRequirement
sshCodeGetter commands.SSHCodeGetter
opts *options.SSHOptions
secureShell sshCmd.SecureShell
}
type sshInfo struct {
SSHEndpoint string `json:"app_ssh_endpoint"`
SSHEndpointFingerprint string `json:"app_ssh_host_key_fingerprint"`
}
func init() {
command_registry.Register(&SSH{})
}
func (cmd *SSH) MetaData() command_registry.CommandMetadata {
fs := make(map[string]flags.FlagSet)
fs["L"] = &cliFlags.StringSliceFlag{Name: "L", Usage: T("Local port forward specification. This flag can be defined more than once.")}
fs["command"] = &cliFlags.StringSliceFlag{Name: "command", ShortName: "c", Usage: T("Command to run. This flag can be defined more than once.")}
fs["app-instance-index"] = &cliFlags.IntFlag{Name: "app-instance-index", ShortName: "i", Usage: T("Application instance index")}
fs["skip-host-validation"] = &cliFlags.BoolFlag{Name: "skip-host-validation", ShortName: "k", Usage: T("Skip host key validation")}
fs["skip-remote-execution"] = &cliFlags.BoolFlag{Name: "skip-remote-execution", ShortName: "N", Usage: T("Do not execute a remote command")}
fs["request-pseudo-tty"] = &cliFlags.BoolFlag{Name: "request-pseudo-tty", ShortName: "t", Usage: T("Request pseudo-tty allocation")}
fs["force-pseudo-tty"] = &cliFlags.BoolFlag{Name: "force-pseudo-tty", ShortName: "tt", Usage: T("Force pseudo-tty allocation")}
fs["disable-pseudo-tty"] = &cliFlags.BoolFlag{Name: "disable-pseudo-tty", ShortName: "T", Usage: T("Disable pseudo-tty allocation")}
return command_registry.CommandMetadata{
Name: "ssh",
Description: T("SSH to an application container instance"),
Usage: T("CF_NAME ssh APP_NAME [-i app-instance-index] [-c command] [-L [bind_address:]port:host:hostport] [--skip-host-validation] [--skip-remote-execution] [--request-pseudo-tty] [--force-pseudo-tty] [--disable-pseudo-tty]"),
Flags: fs,
}
}
func (cmd *SSH) Requirements(requirementsFactory requirements.Factory, fc flags.FlagContext) (reqs []requirements.Requirement, err error) {
if len(fc.Args()) != 1 {
cmd.ui.Failed(T("Incorrect Usage. Requires APP_NAME as argument") + "\n\n" + command_registry.Commands.CommandUsage("ssh"))
}
if fc.IsSet("i") && fc.Int("i") < 0 {
cmd.ui.Failed(fmt.Sprintf(T("Incorrect Usage:")+" %s\n\n%s", T("Value for flag 'app-instance-index' cannot be negative"), command_registry.Commands.CommandUsage("ssh")))
}
cmd.opts, err = options.NewSSHOptions(fc)
if err != nil {
cmd.ui.Failed(fmt.Sprintf(T("Incorrect Usage:")+" %s\n\n%s", err.Error(), command_registry.Commands.CommandUsage("ssh")))
}
cmd.appReq = requirementsFactory.NewApplicationRequirement(cmd.opts.AppName)
reqs = []requirements.Requirement{
requirementsFactory.NewLoginRequirement(),
requirementsFactory.NewTargetedSpaceRequirement(),
cmd.appReq,
}
return
}
func (cmd *SSH) SetDependency(deps command_registry.Dependency, pluginCall bool) command_registry.Command {
cmd.ui = deps.Ui
cmd.config = deps.Config
cmd.gateway = deps.Gateways["cloud-controller"]
if deps.WilecardDependency != nil {
cmd.secureShell = deps.WilecardDependency.(sshCmd.SecureShell)
}
//get ssh-code for dependency
sshCodeGetter := command_registry.Commands.FindCommand("ssh-code")
sshCodeGetter = sshCodeGetter.SetDependency(deps, false)
cmd.sshCodeGetter = sshCodeGetter.(commands.SSHCodeGetter)
return cmd
}
func (cmd *SSH) Execute(fc flags.FlagContext) {
app := cmd.appReq.GetApplication()
info, err := cmd.getSSHEndpointInfo()
if err != nil {
cmd.ui.Failed(T("Error getting SSH info:") + err.Error())
}
sshAuthCode, err := cmd.sshCodeGetter.Get()
if err != nil {
cmd.ui.Failed(T("Error getting one time auth code: ") + err.Error())
}
//init secureShell if it is not already set by SetDependency() with fakes
if cmd.secureShell == nil {
cmd.secureShell = sshCmd.NewSecureShell(
sshCmd.DefaultSecureDialer(),
sshTerminal.DefaultHelper(),
sshCmd.DefaultListenerFactory(),
30*time.Second,
app,
info.SSHEndpointFingerprint,
info.SSHEndpoint,
sshAuthCode,
)
}
err = cmd.secureShell.Connect(cmd.opts)
if err != nil {
cmd.ui.Failed(T("Error opening SSH connection: ") + err.Error())
}
defer cmd.secureShell.Close()
err = cmd.secureShell.LocalPortForward()
if err != nil {
cmd.ui.Failed(T("Error forwarding port: ") + err.Error())
}
if cmd.opts.SkipRemoteExecution {
err = cmd.secureShell.Wait()
} else {
err = cmd.secureShell.InteractiveSession()
}
if err == nil {
return
}
if exitError, ok := err.(*ssh.ExitError); ok {
exitStatus := exitError.ExitStatus()
if sig := exitError.Signal(); sig != "" {
cmd.ui.Say(fmt.Sprintf(T("Process terminated by signal: %s. Exited with")+" %d.\n", sig, exitStatus))
}
os.Exit(exitStatus)
} else {
cmd.ui.Failed(T("Error: ") + err.Error())
}
}
func (cmd *SSH) getSSHEndpointInfo() (sshInfo, error) {
info := sshInfo{}
apiErr := cmd.gateway.GetResource(cmd.config.ApiEndpoint()+"/v2/info", &info)
return info, apiErr
}