Example #1
0
func proxyCommand(host *config.Host, command string) error {
	command = host.ExpandString(command)
	args, err := shlex.Split(command)
	Logger.Debugf("ProxyCommand: %s", command)
	if err != nil {
		return err
	}
	spawn := exec.Command(args[0], args[1:]...)
	spawn.Stdout = os.Stdout
	spawn.Stdin = os.Stdin
	spawn.Stderr = os.Stderr
	return spawn.Run()
}
Example #2
0
func proxyCommand(host *config.Host, command string, dryRun bool) error {
	command = host.ExpandString(command)
	Logger.Debugf("ProxyCommand: %s", command)
	args, err := shlex.Split(command)
	if err != nil {
		return err
	}

	if dryRun {
		return fmt.Errorf("dry-run: Execute %s", args)
	}

	spawn := exec.Command(args[0], args[1:]...)
	spawn.Stdout = os.Stdout
	spawn.Stdin = os.Stdin
	spawn.Stderr = os.Stderr
	return spawn.Run()
}
Example #3
0
func proxy(host *config.Host, conf *config.Config) error {
	if len(host.Gateways) > 0 {
		Logger.Debugf("Trying gateways: %s", host.Gateways)
		for _, gateway := range host.Gateways {
			if gateway == "direct" {
				err := proxyDirect(host)
				if err != nil {
					Logger.Errorf("Failed to use 'direct' connection")
				}
			} else {
				gatewayHost := conf.GetGatewaySafe(gateway)

				err := prepareHostControlPath(host, gatewayHost)
				if err != nil {
					return err
				}

				if host.ProxyCommand == "" {
					host.ProxyCommand = "nc %h %p"
				}
				// FIXME: dynamically add "-v" flags

				if err = hostPrepare(host); err != nil {
					return err
				}

				command := "ssh %name -- " + host.ExpandString(host.ProxyCommand)

				Logger.Debugf("Using gateway '%s': %s", gateway, command)
				err = proxyCommand(gatewayHost, command)
				if err == nil {
					return nil
				}
				Logger.Errorf("Cannot use gateway '%s': %v", gateway, err)
			}
		}
		return fmt.Errorf("No such available gateway")
	}

	Logger.Debugf("Connecting without gateway")
	return proxyDirect(host)
}
Example #4
0
func hostPrepare(host *config.Host) error {
	if host.HostName == "" {
		host.HostName = host.Name()
	}

	if len(host.ResolveNameservers) > 0 {
		Logger.Debugf("Resolving host: '%s' using nameservers %s", host.HostName, host.ResolveNameservers)
		// FIXME: resolve using custom dns server
		results, err := net.LookupAddr(host.HostName)
		if err != nil {
			return err
		}
		if len(results) > 0 {
			host.HostName = results[0]
		}
		Logger.Debugf("Resolved host is: %s", host.HostName)
	}

	if host.ResolveCommand != "" {
		command := host.ExpandString(host.ResolveCommand)
		Logger.Debugf("Resolving host: %q using command: %q", host.HostName, command)

		args, err := shlex.Split(command)
		if err != nil {
			return err
		}

		cmd := exec.Command(args[0], args[1:]...)
		var stdout bytes.Buffer
		var stderr bytes.Buffer
		cmd.Stdout = &stdout
		cmd.Stderr = &stderr
		if err := cmd.Run(); err != nil {
			Logger.Errorf("ResolveCommand failed: %s", stderr.String())
			return err
		}

		host.HostName = strings.TrimSpace(fmt.Sprintf("%s", stdout.String()))
		Logger.Debugf("Resolved host is: %s", host.HostName)
	}
	return nil
}
Example #5
0
func hostPrepare(host *config.Host) error {
	if host.HostName == "" {
		host.HostName = host.Name()
	}

	if len(host.ResolveNameservers) > 0 {
		Logger.Debugf("Resolving host: '%s' using nameservers %s", host.HostName, host.ResolveNameservers)
		// FIXME: resolve using custom dns server
		results, err := net.LookupAddr(host.HostName)
		if err != nil {
			return err
		}
		if len(results) > 0 {
			host.HostName = results[0]
		}
		Logger.Debugf("Resolved host is: %s", host.HostName)
	}

	if host.ResolveCommand != "" {
		command := host.ExpandString(host.ResolveCommand)
		Logger.Debugf("Resolving host: %q using command: %q", host.HostName, command)

		args, err := shlex.Split(command)
		if err != nil {
			return err
		}

		out, err := exec.Command(args[0], args[1:]...).Output()
		if err != nil {
			return err
		}

		host.HostName = strings.TrimSpace(fmt.Sprintf("%s", out))
		Logger.Debugf("Resolved host is: %s", host.HostName)
	}
	return nil
}