Add sshchat dependencies in vendor

vendor/github.com/shazow/ssh-chat/sshd/client.go

@@ -0,0 +1,76 @@
+package sshd
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"io"
+
+	"golang.org/x/crypto/ssh"
+)
+
+// NewRandomSigner generates a random key of a desired bit length.
+func NewRandomSigner(bits int) (ssh.Signer, error) {
+	key, err := rsa.GenerateKey(rand.Reader, bits)
+	if err != nil {
+		return nil, err
+	}
+	return ssh.NewSignerFromKey(key)
+}
+
+// NewClientConfig creates a barebones ssh.ClientConfig to be used with ssh.Dial.
+func NewClientConfig(name string) *ssh.ClientConfig {
+	return &ssh.ClientConfig{
+		User: name,
+		Auth: []ssh.AuthMethod{
+			ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
+				return
+			}),
+		},
+		HostKeyCallback: ssh.InsecureIgnoreHostKey(),
+	}
+}
+
+// ConnectShell makes a barebones SSH client session, used for testing.
+func ConnectShell(host string, name string, handler func(r io.Reader, w io.WriteCloser) error) error {
+	config := NewClientConfig(name)
+	conn, err := ssh.Dial("tcp", host, config)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	session, err := conn.NewSession()
+	if err != nil {
+		return err
+	}
+	defer session.Close()
+
+	in, err := session.StdinPipe()
+	if err != nil {
+		return err
+	}
+
+	out, err := session.StdoutPipe()
+	if err != nil {
+		return err
+	}
+
+	/*
+		err = session.RequestPty("xterm", 80, 40, ssh.TerminalModes{})
+		if err != nil {
+			return err
+		}
+	*/
+
+	err = session.Shell()
+	if err != nil {
+		return err
+	}
+
+	_, err = session.SendRequest("ping", true, nil)
+	if err != nil {
+		return err
+	}
+
+	return handler(out, in)
+}