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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package vmimpl
import (
"fmt"
"time"
"github.com/google/syzkaller/pkg/log"
"github.com/google/syzkaller/pkg/osutil"
"github.com/google/syzkaller/sys/targets"
)
// Sleep for d.
// If shutdown is in progress, return false prematurely.
func SleepInterruptible(d time.Duration) bool {
select {
case <-time.After(d):
return true
case <-Shutdown:
return false
}
}
type SSHOptions struct {
Addr string
Port int
User string
Key string
}
func WaitForSSH(timeout time.Duration, opts SSHOptions, OS string, stop chan error, systemSSHCfg, debug bool) error {
pwd := "pwd"
if OS == targets.Windows {
pwd = "dir"
}
startTime := time.Now()
SleepInterruptible(5 * time.Second)
for {
select {
case <-time.After(5 * time.Second):
case err := <-stop:
return err
case <-Shutdown:
return fmt.Errorf("shutdown in progress")
}
args := append(SSHArgs(debug, opts.Key, opts.Port, systemSSHCfg), opts.User+"@"+opts.Addr, pwd)
if debug {
log.Logf(0, "running ssh: %#v", args)
}
_, err := osutil.RunCmd(time.Minute, "", "ssh", args...)
if err == nil {
return nil
}
if debug {
log.Logf(0, "ssh failed: %v", err)
}
if time.Since(startTime) > timeout {
return &osutil.VerboseError{Title: "can't ssh into the instance", Output: []byte(err.Error())}
}
}
}
func SSHArgs(debug bool, sshKey string, port int, systemSSHCfg bool) []string {
return sshArgs(debug, sshKey, "-p", port, 0, systemSSHCfg)
}
func SSHArgsForward(debug bool, sshKey string, port, forwardPort int, systemSSHCfg bool) []string {
return sshArgs(debug, sshKey, "-p", port, forwardPort, systemSSHCfg)
}
func SCPArgs(debug bool, sshKey string, port int, systemSSHCfg bool) []string {
return sshArgs(debug, sshKey, "-P", port, 0, systemSSHCfg)
}
func sshArgs(debug bool, sshKey, portArg string, port, forwardPort int, systemSSHCfg bool) []string {
args := []string{portArg, fmt.Sprint(port)}
if !systemSSHCfg {
args = append(args,
"-F", "/dev/null",
"-o", "UserKnownHostsFile=/dev/null",
"-o", "IdentitiesOnly=yes")
}
args = append(args,
"-o", "BatchMode=yes",
"-o", "StrictHostKeyChecking=no",
"-o", "ConnectTimeout=10",
)
if sshKey != "" {
args = append(args, "-i", sshKey)
}
if forwardPort != 0 {
// Forward target port as part of the ssh connection (reverse proxy).
args = append(args, "-R", fmt.Sprintf("%v:127.0.0.1:%v", forwardPort, forwardPort))
}
if debug {
args = append(args, "-v")
}
return args
}
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