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package connection
import (
"encoding/json"
"errors"
"fmt"
"net"
"net/url"
"os"
"regexp"
"github.com/containers/common/pkg/completion"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v4/cmd/podman/registry"
"github.com/containers/podman/v4/cmd/podman/system"
"github.com/containers/podman/v4/libpod/define"
"github.com/containers/podman/v4/pkg/domain/utils"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh"
)
var (
addCmd = &cobra.Command{
Use: "add [options] NAME DESTINATION",
Args: cobra.ExactArgs(2),
Short: "Record destination for the Podman service",
Long: `Add destination to podman configuration.
"destination" is one of the form:
[user@]hostname (will default to ssh)
ssh://[user@]hostname[:port][/path] (will obtain socket path from service, if not given.)
tcp://hostname:port (not secured)
unix://path (absolute path required)
`,
RunE: add,
ValidArgsFunction: completion.AutocompleteNone,
Example: `podman system connection add laptop server.fubar.com
podman system connection add --identity ~/.ssh/dev_rsa testing ssh://root@server.fubar.com:2222
podman system connection add --identity ~/.ssh/dev_rsa --port 22 production root@server.fubar.com
podman system connection add debug tcp://localhost:8080
`,
}
cOpts = struct {
Identity string
Port int
UDSPath string
Default bool
}{}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Command: addCmd,
Parent: system.ConnectionCmd,
})
flags := addCmd.Flags()
portFlagName := "port"
flags.IntVarP(&cOpts.Port, portFlagName, "p", 22, "SSH port number for destination")
_ = addCmd.RegisterFlagCompletionFunc(portFlagName, completion.AutocompleteNone)
identityFlagName := "identity"
flags.StringVar(&cOpts.Identity, identityFlagName, "", "path to SSH identity file")
_ = addCmd.RegisterFlagCompletionFunc(identityFlagName, completion.AutocompleteDefault)
socketPathFlagName := "socket-path"
flags.StringVar(&cOpts.UDSPath, socketPathFlagName, "", "path to podman socket on remote host. (default '/run/podman/podman.sock' or '/run/user/{uid}/podman/podman.sock)")
_ = addCmd.RegisterFlagCompletionFunc(socketPathFlagName, completion.AutocompleteDefault)
flags.BoolVarP(&cOpts.Default, "default", "d", false, "Set connection to be default")
}
func add(cmd *cobra.Command, args []string) error {
// Default to ssh schema if none given
dest := args[1]
if match, err := regexp.Match("^[A-Za-z][A-Za-z0-9+.-]*://", []byte(dest)); err != nil {
return fmt.Errorf("invalid destination: %w", err)
} else if !match {
dest = "ssh://" + dest
}
uri, err := url.Parse(dest)
if err != nil {
return err
}
if cmd.Flags().Changed("socket-path") {
uri.Path = cmd.Flag("socket-path").Value.String()
}
switch uri.Scheme {
case "ssh":
if uri.User.Username() == "" {
if uri.User, err = utils.GetUserInfo(uri); err != nil {
return err
}
}
if cmd.Flags().Changed("port") {
uri.Host = net.JoinHostPort(uri.Hostname(), cmd.Flag("port").Value.String())
}
if uri.Port() == "" {
uri.Host = net.JoinHostPort(uri.Hostname(), cmd.Flag("port").DefValue)
}
iden := ""
if cmd.Flags().Changed("identity") {
iden = cOpts.Identity
}
if uri.Path == "" || uri.Path == "/" {
if uri.Path, err = getUDS(uri, iden); err != nil {
return err
}
}
case "unix":
if cmd.Flags().Changed("identity") {
return errors.New("--identity option not supported for unix scheme")
}
if cmd.Flags().Changed("socket-path") {
uri.Path = cmd.Flag("socket-path").Value.String()
}
info, err := os.Stat(uri.Path)
switch {
case errors.Is(err, os.ErrNotExist):
logrus.Warnf("%q does not exists", uri.Path)
case errors.Is(err, os.ErrPermission):
logrus.Warnf("You do not have permission to read %q", uri.Path)
case err != nil:
return err
case info.Mode()&os.ModeSocket == 0:
return fmt.Errorf("%q exists and is not a unix domain socket", uri.Path)
}
case "tcp":
if cmd.Flags().Changed("socket-path") {
return errors.New("--socket-path option not supported for tcp scheme")
}
if cmd.Flags().Changed("identity") {
return errors.New("--identity option not supported for tcp scheme")
}
if uri.Port() == "" {
return errors.New("tcp scheme requires a port either via --port or in destination URL")
}
default:
logrus.Warnf("%q unknown scheme, no validation provided", uri.Scheme)
}
cfg, err := config.ReadCustomConfig()
if err != nil {
return err
}
if cmd.Flags().Changed("default") {
if cOpts.Default {
cfg.Engine.ActiveService = args[0]
}
}
dst := config.Destination{
URI: uri.String(),
}
if cmd.Flags().Changed("identity") {
dst.Identity = cOpts.Identity
}
if cfg.Engine.ServiceDestinations == nil {
cfg.Engine.ServiceDestinations = map[string]config.Destination{
args[0]: dst,
}
cfg.Engine.ActiveService = args[0]
} else {
cfg.Engine.ServiceDestinations[args[0]] = dst
}
return cfg.Write()
}
func getUDS(uri *url.URL, iden string) (string, error) {
cfg, err := utils.ValidateAndConfigure(uri, iden)
if err != nil {
return "", fmt.Errorf("failed to validate: %w", err)
}
dial, err := ssh.Dial("tcp", uri.Host, cfg)
if err != nil {
return "", fmt.Errorf("failed to connect: %w", err)
}
defer dial.Close()
session, err := dial.NewSession()
if err != nil {
return "", fmt.Errorf("failed to create new ssh session on %q: %w", uri.Host, err)
}
defer session.Close()
// Override podman binary for testing etc
podman := "podman"
if v, found := os.LookupEnv("PODMAN_BINARY"); found {
podman = v
}
infoJSON, err := utils.ExecRemoteCommand(dial, podman+" info --format=json")
if err != nil {
return "", err
}
var info define.Info
if err := json.Unmarshal(infoJSON, &info); err != nil {
return "", fmt.Errorf("failed to parse 'podman info' results: %w", err)
}
if info.Host.RemoteSocket == nil || len(info.Host.RemoteSocket.Path) == 0 {
return "", fmt.Errorf("remote podman %q failed to report its UDS socket", uri.Host)
}
return info.Host.RemoteSocket.Path, nil
}
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