mirror of
https://github.com/zrepl/zrepl.git
synced 2024-12-18 05:00:50 +01:00
150 lines
3.5 KiB
Go
150 lines
3.5 KiB
Go
package ssh
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import (
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"context"
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"fmt"
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"net"
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"path"
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"sync/atomic"
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"github.com/pkg/errors"
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"github.com/problame/go-netssh"
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"github.com/zrepl/zrepl/config"
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"github.com/zrepl/zrepl/daemon/nethelpers"
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"github.com/zrepl/zrepl/transport"
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)
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func MultiStdinserverListenerFactoryFromConfig(g *config.Global, in *config.StdinserverServer) (transport.AuthenticatedListenerFactory, error) {
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for _, ci := range in.ClientIdentities {
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if err := transport.ValidateClientIdentity(ci); err != nil {
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return nil, errors.Wrapf(err, "invalid client identity %q", ci)
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}
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}
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clientIdentities := in.ClientIdentities
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sockdir := g.Serve.StdinServer.SockDir
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lf := func() (transport.AuthenticatedListener, error) {
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return multiStdinserverListenerFromClientIdentities(sockdir, clientIdentities)
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}
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return lf, nil
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}
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type multiStdinserverAcceptRes struct {
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conn *transport.AuthConn
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err error
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}
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type MultiStdinserverListener struct {
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listeners []*stdinserverListener
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accepts chan multiStdinserverAcceptRes
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closed int32
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}
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// client identities must be validated
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func multiStdinserverListenerFromClientIdentities(sockdir string, cis []string) (*MultiStdinserverListener, error) {
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listeners := make([]*stdinserverListener, 0, len(cis))
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var err error
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for _, ci := range cis {
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sockpath := path.Join(sockdir, ci)
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l := &stdinserverListener{clientIdentity: ci}
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if err = nethelpers.PreparePrivateSockpath(sockpath); err != nil {
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break
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}
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if l.l, err = netssh.Listen(sockpath); err != nil {
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break
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}
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listeners = append(listeners, l)
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}
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if err != nil {
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for _, l := range listeners {
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l.Close() // FIXME error reporting?
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}
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return nil, err
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}
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return &MultiStdinserverListener{listeners: listeners}, nil
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}
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func (m *MultiStdinserverListener) Accept(ctx context.Context) (*transport.AuthConn, error) {
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if m.accepts == nil {
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m.accepts = make(chan multiStdinserverAcceptRes, len(m.listeners))
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for i := range m.listeners {
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go func(i int) {
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for atomic.LoadInt32(&m.closed) == 0 {
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conn, err := m.listeners[i].Accept(context.TODO())
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m.accepts <- multiStdinserverAcceptRes{conn, err}
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}
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}(i)
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}
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}
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res := <-m.accepts
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return res.conn, res.err
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}
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type multiListenerAddr struct {
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clients []string
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}
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func (multiListenerAddr) Network() string { return "netssh" }
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func (l multiListenerAddr) String() string {
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return fmt.Sprintf("netssh:clients=%v", l.clients)
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}
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func (m *MultiStdinserverListener) Addr() net.Addr {
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cis := make([]string, len(m.listeners))
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for i := range cis {
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cis[i] = m.listeners[i].clientIdentity
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}
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return multiListenerAddr{cis}
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}
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func (m *MultiStdinserverListener) Close() error {
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atomic.StoreInt32(&m.closed, 1)
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var oneErr error
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for _, l := range m.listeners {
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if err := l.Close(); err != nil && oneErr == nil {
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oneErr = err
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}
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}
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return oneErr
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}
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// a single stdinserverListener (part of multiStdinserverListener)
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type stdinserverListener struct {
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l *netssh.Listener
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clientIdentity string
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}
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type listenerAddr struct {
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clientIdentity string
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}
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func (listenerAddr) Network() string { return "netssh" }
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func (a listenerAddr) String() string {
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return fmt.Sprintf("netssh:client=%q", a.clientIdentity)
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}
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func (l stdinserverListener) Addr() net.Addr {
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return listenerAddr{l.clientIdentity}
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}
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func (l stdinserverListener) Accept(ctx context.Context) (*transport.AuthConn, error) {
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c, err := l.l.Accept()
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if err != nil {
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return nil, err
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}
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return transport.NewAuthConn(c, l.clientIdentity), nil
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}
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func (l stdinserverListener) Close() (err error) {
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return l.l.Close()
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}
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