mirror of
https://github.com/zrepl/zrepl.git
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114 lines
2.7 KiB
Go
114 lines
2.7 KiB
Go
package cmd
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import (
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"github.com/ftrvxmtrx/fd"
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"github.com/mitchellh/mapstructure"
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"github.com/pkg/errors"
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"io"
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"net"
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"os"
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"path"
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"path/filepath"
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)
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type StdinserverListenerFactory struct {
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ClientIdentity string `mapstructure:"client_identity"`
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}
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func parseStdinserverListenerFactory(i map[string]interface{}) (f *StdinserverListenerFactory, err error) {
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f = &StdinserverListenerFactory{}
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if err = mapstructure.Decode(i, f); err != nil {
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return nil, errors.Wrap(err, "mapstructure error")
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}
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if !(len(f.ClientIdentity) > 0) {
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err = errors.Errorf("must specify 'client_identity'")
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return
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}
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return
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}
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func stdinserverListenerSockpath(clientIdentity string) (addr *net.UnixAddr, err error) {
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sockpath := path.Join(conf.Global.Serve.Stdinserver.SockDir, clientIdentity)
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addr, err = net.ResolveUnixAddr("unix", sockpath)
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if err != nil {
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return nil, errors.Wrap(err, "cannot resolve unix address")
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}
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return addr, nil
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}
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func (f *StdinserverListenerFactory) Listen() (al AuthenticatedChannelListener, err error) {
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unixaddr, err := stdinserverListenerSockpath(f.ClientIdentity)
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sockdir := filepath.Dir(unixaddr.Name)
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sdstat, err := os.Stat(sockdir)
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if err != nil {
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return nil, errors.Wrapf(err, "cannot stat(2) sockdir '%s'", sockdir)
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}
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if !sdstat.IsDir() {
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return nil, errors.Errorf("sockdir is not a directory: %s", sockdir)
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}
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p := sdstat.Mode().Perm()
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if p&0007 != 0 {
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return nil, errors.Errorf("sockdir must not be world-accessible (permissions are %#o)", p)
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}
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ul, err := net.ListenUnix("unix", unixaddr) // TODO
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if err != nil {
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return nil, errors.Wrapf(err, "cannot listen on unix socket %s", unixaddr)
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}
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l := &StdinserverListener{ul}
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return l, nil
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}
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type StdinserverListener struct {
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l *net.UnixListener
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}
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type fdRWC struct {
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stdin, stdout *os.File
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control *net.UnixConn
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}
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func (f fdRWC) Read(p []byte) (n int, err error) {
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return f.stdin.Read(p)
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}
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func (f fdRWC) Write(p []byte) (n int, err error) {
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return f.stdout.Write(p)
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}
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func (f fdRWC) Close() (err error) {
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f.stdin.Close()
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f.stdout.Close()
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return f.control.Close()
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}
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func (l *StdinserverListener) Accept() (ch io.ReadWriteCloser, err error) {
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c, err := l.l.Accept()
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if err != nil {
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err = errors.Wrap(err, "error accepting on unix listener")
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return
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}
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// Read the stdin and stdout of the stdinserver command
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files, err := fd.Get(c.(*net.UnixConn), 2, []string{"stdin", "stdout"})
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if err != nil {
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err = errors.Wrap(err, "error receiving fds from stdinserver command")
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c.Close()
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}
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rwc := fdRWC{files[0], files[1], c.(*net.UnixConn)}
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return rwc, nil
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}
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func (l *StdinserverListener) Close() (err error) {
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return l.l.Close() // removes socket file automatically
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}
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