forked from hashicorp/packer
/
connect.go
68 lines (58 loc) · 1.46 KB
/
connect.go
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package ssh
import (
"fmt"
"net"
"time"
"golang.org/x/crypto/ssh"
)
// ConnectFunc is a convenience method for returning a function
// that just uses net.Dial to communicate with the remote end that
// is suitable for use with the SSH communicator configuration.
func ConnectFunc(network, addr string) func() (net.Conn, error) {
return func() (net.Conn, error) {
c, err := net.DialTimeout(network, addr, 15*time.Second)
if err != nil {
return nil, err
}
if tcpConn, ok := c.(*net.TCPConn); ok {
tcpConn.SetKeepAlive(true)
tcpConn.SetKeepAlivePeriod(5 * time.Second)
}
return c, nil
}
}
// BastionConnectFunc is a convenience method for returning a function
// that connects to a host over a bastion connection.
func BastionConnectFunc(
bProto string,
bAddr string,
bConf *ssh.ClientConfig,
proto string,
addr string) func() (net.Conn, error) {
return func() (net.Conn, error) {
// Connect to the bastion
bastion, err := ssh.Dial(bProto, bAddr, bConf)
if err != nil {
return nil, fmt.Errorf("Error connecting to bastion: %s", err)
}
// Connect through to the end host
conn, err := bastion.Dial(proto, addr)
if err != nil {
bastion.Close()
return nil, err
}
// Wrap it up so we close both things properly
return &bastionConn{
Conn: conn,
Bastion: bastion,
}, nil
}
}
type bastionConn struct {
net.Conn
Bastion *ssh.Client
}
func (c *bastionConn) Close() error {
c.Conn.Close()
return c.Bastion.Close()
}