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connect_uri.go
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package libvirt
import (
"errors"
"fmt"
"net/url"
"os/user"
"strconv"
"strings"
"github.com/digitalocean/go-libvirt/socket"
"github.com/digitalocean/go-libvirt/socket/dialers"
)
// ConnectToURI returns a new, connected client instance using the appropriate
// dialer for the given libvirt URI.
func ConnectToURI(uri *url.URL) (*Libvirt, error) {
dialer, err := dialerForURI(uri)
if err != nil {
return nil, err
}
lv := NewWithDialer(dialer)
if err := lv.ConnectToURI(RemoteURI(uri)); err != nil {
return nil, fmt.Errorf("failed to connect to libvirt: %w", err)
}
return lv, nil
}
// RemoteURI returns the libvirtd URI corresponding to a given client URI.
// The client URI contains details of the connection method, but once connected
// to libvirtd, all connections are local. So e.g. the client may want to
// connect to qemu+tcp://example.com/system but once the socket is established
// it will ask the remote libvirtd for qemu:///system.
func RemoteURI(uri *url.URL) ConnectURI {
remoteURI := (&url.URL{
Scheme: strings.Split(uri.Scheme, "+")[0],
Path: uri.Path,
}).String()
if name := uri.Query().Get("name"); name != "" {
remoteURI = name
}
return ConnectURI(remoteURI)
}
func dialerForURI(uri *url.URL) (socket.Dialer, error) {
transport := "unix"
if scheme := strings.SplitN(uri.Scheme, "+", 2); len(scheme) > 1 {
transport = scheme[1]
} else if uri.Host != "" {
transport = "tls"
}
switch transport {
case "unix":
options := []dialers.LocalOption{}
if s := uri.Query().Get("socket"); s != "" {
options = append(options, dialers.WithSocket(s))
}
if err := checkModeOption(uri); err != nil {
return nil, err
}
return dialers.NewLocal(options...), nil
case "tcp":
options := []dialers.RemoteOption{}
if port := uri.Port(); port != "" {
options = append(options, dialers.UsePort(port))
}
return dialers.NewRemote(uri.Hostname(), options...), nil
case "tls":
options := []dialers.TLSOption{}
if port := uri.Port(); port != "" {
options = append(options, dialers.UseTLSPort(port))
}
if pkiPath := uri.Query().Get("pkipath"); pkiPath != "" {
options = append(options, dialers.UsePKIPath(pkiPath))
}
if nv, err := noVerifyOption(uri); err != nil {
return nil, err
} else if nv {
options = append(options, dialers.WithInsecureNoVerify())
}
return dialers.NewTLS(uri.Hostname(), options...), nil
case "libssh", "libssh2":
options := []dialers.SSHOption{}
options, err := processCommonSSHOptions(uri, options)
if err != nil {
return nil, err
}
if knownHosts := uri.Query().Get("known_hosts"); knownHosts != "" {
options = append(options, dialers.UseKnownHostsFile(knownHosts))
}
if hostVerify := uri.Query().Get("known_hosts_verify"); hostVerify != "" {
switch hostVerify {
case "normal":
case "auto":
options = append(options, dialers.WithAcceptUnknownHostKey())
case "ignore":
options = append(options, dialers.WithInsecureIgnoreHostKey())
default:
return nil, fmt.Errorf("invalid ssh known hosts verify method %v", hostVerify)
}
}
if auth := uri.Query().Get("sshauth"); auth != "" {
authMethods := &dialers.SSHAuthMethods{}
for _, a := range strings.Split(auth, ",") {
switch strings.ToLower(a) {
case "agent":
authMethods.Agent()
case "privkey":
authMethods.PrivKey()
case "password":
authMethods.Password()
case "keyboard-interactive":
authMethods.KeyboardInteractive()
default:
return nil, fmt.Errorf("invalid ssh auth method %v", a)
}
}
options = append(options, dialers.WithSSHAuthMethods(authMethods))
}
if noVerify := uri.Query().Get("no_verify"); noVerify != "" {
return nil, fmt.Errorf(
"\"no_verify\" option invalid with %s transport, use known_hosts_verify=ignore instead",
transport)
}
return dialers.NewSSH(uri.Hostname(), options...), nil
case "ssh":
// Emulate ssh using golang ssh library. Note that this means that
// system ssh config is not respected as it would be when shelling out
// to the ssh binary.
currentUser, err := user.Current()
if err != nil {
return nil, err
}
options := []dialers.SSHOption{
dialers.WithSystemSSHDefaults(currentUser),
}
options, err = processCommonSSHOptions(uri, options)
if err != nil {
return nil, err
}
if nv, err := noVerifyOption(uri); err != nil {
return nil, err
} else if nv {
options = append(options, dialers.WithInsecureIgnoreHostKey())
}
fieldErrs := []error{}
for _, f := range []string{
"known_hosts",
"known_hosts_verify",
"sshauth",
} {
if field := uri.Query().Get(f); field != "" {
fieldErrs = append(fieldErrs,
fmt.Errorf("%v option invalid with ssh transport, use libssh transport instead", f))
}
}
if len(fieldErrs) > 0 {
return nil, errors.Join(fieldErrs...)
}
return dialers.NewSSH(uri.Hostname(), options...), nil
default:
return nil, fmt.Errorf("unsupported libvirt transport %s", transport)
}
}
func noVerifyOption(uri *url.URL) (bool, error) {
nv := uri.Query().Get("no_verify")
if nv == "" {
return false, nil
}
val, err := strconv.Atoi(nv)
if err != nil {
return false, fmt.Errorf("invalid value for no_verify: %w", err)
}
return val != 0, nil
}
func checkModeOption(uri *url.URL) error {
mode := uri.Query().Get("mode")
switch strings.ToLower(mode) {
case "":
case "legacy", "auto":
case "direct":
return errors.New("cannot connect in direct mode")
default:
return fmt.Errorf("invalid ssh mode %v", mode)
}
return nil
}
func processCommonSSHOptions(uri *url.URL, options []dialers.SSHOption) ([]dialers.SSHOption, error) {
if port := uri.Port(); port != "" {
options = append(options, dialers.UseSSHPort(port))
}
if username := uri.User.Username(); username != "" {
options = append(options, dialers.UseSSHUsername(username))
}
if password, ok := uri.User.Password(); ok {
options = append(options, dialers.UseSSHPassword(password))
}
if socket := uri.Query().Get("socket"); socket != "" {
options = append(options, dialers.WithRemoteSocket(socket))
}
if keyFile := uri.Query().Get("keyfile"); keyFile != "" {
options = append(options, dialers.UseKeyFile(keyFile))
}
if err := checkModeOption(uri); err != nil {
return options, err
}
return options, nil
}