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package ssh
import (
"errors"
"fmt"
"io"
"strings"
"gopkg.in/src-d/go-git.v4/plumbing/transport"
"golang.org/x/crypto/ssh"
)
// New errors introduced by this package.
var (
ErrAdvertistedReferencesAlreadyCalled = errors.New("cannot call AdvertisedReference twice")
ErrAlreadyConnected = errors.New("ssh session already created")
ErrAuthRequired = errors.New("cannot connect: auth required")
ErrNotConnected = errors.New("not connected")
ErrUploadPackAnswerFormat = errors.New("git-upload-pack bad answer format")
ErrUnsupportedVCS = errors.New("only git is supported")
ErrUnsupportedRepo = errors.New("only github.com is supported")
)
type Client struct{}
var DefaultClient = NewClient()
func NewClient() transport.Client {
return &Client{}
}
func (c *Client) NewFetchPackSession(ep transport.Endpoint) (
transport.FetchPackSession, error) {
return newFetchPackSession(ep)
}
func (c *Client) NewSendPackSession(ep transport.Endpoint) (
transport.SendPackSession, error) {
return newSendPackSession(ep)
}
type session struct {
connected bool
endpoint transport.Endpoint
client *ssh.Client
session *ssh.Session
stdin io.WriteCloser
stdout io.Reader
sessionDone chan error
auth AuthMethod
}
func (s *session) SetAuth(auth transport.AuthMethod) error {
a, ok := auth.(AuthMethod)
if !ok {
return transport.ErrInvalidAuthMethod
}
s.auth = a
return nil
}
// Close closes the SSH session.
func (s *session) Close() error {
if !s.connected {
return nil
}
s.connected = false
return s.client.Close()
}
// ensureConnected connects to the SSH server, unless a AuthMethod was set with
// SetAuth method, by default uses an auth method based on PublicKeysCallback,
// it connects to a SSH agent, using the address stored in the SSH_AUTH_SOCK
// environment var.
func (s *session) connect() error {
if s.connected {
return ErrAlreadyConnected
}
if err := s.setAuthFromEndpoint(); err != nil {
return err
}
var err error
s.client, err = ssh.Dial("tcp", s.getHostWithPort(), s.auth.clientConfig())
if err != nil {
return err
}
if err := s.openSSHSession(); err != nil {
_ = s.client.Close()
return err
}
s.connected = true
return nil
}
func (s *session) getHostWithPort() string {
host := s.endpoint.Host
if strings.Index(s.endpoint.Host, ":") == -1 {
host += ":22"
}
return host
}
func (s *session) setAuthFromEndpoint() error {
var u string
if info := s.endpoint.User; info != nil {
u = info.Username()
}
var err error
s.auth, err = NewSSHAgentAuth(u)
return err
}
func (s *session) openSSHSession() error {
var err error
s.session, err = s.client.NewSession()
if err != nil {
return fmt.Errorf("cannot open SSH session: %s", err)
}
s.stdin, err = s.session.StdinPipe()
if err != nil {
return fmt.Errorf("cannot pipe remote stdin: %s", err)
}
s.stdout, err = s.session.StdoutPipe()
if err != nil {
return fmt.Errorf("cannot pipe remote stdout: %s", err)
}
return nil
}
func (s *session) runCommand(cmd string) chan error {
done := make(chan error)
go func() {
done <- s.session.Run(cmd)
}()
return done
}
|
