| // Copyright 2017 The LUCI Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| // +build darwin dragonfly freebsd linux netbsd openbsd |
| |
| package streamclient |
| |
| import ( |
| "io" |
| "net" |
| "os" |
| |
| "go.chromium.org/luci/common/errors" |
| "go.chromium.org/luci/logdog/client/butlerlib/streamproto" |
| ) |
| |
| type unixDialer struct { |
| path string |
| } |
| |
| var _ dialer = (*unixDialer)(nil) |
| |
| func (u *unixDialer) conn(f streamproto.Flags) (*net.UnixConn, error) { |
| conn, err := net.DialUnix("unix", nil, &net.UnixAddr{Net: "unix", Name: u.path}) |
| if err != nil { |
| return nil, errors.Annotate(err, "opening socket %q", u.path).Err() |
| } |
| if err = f.WriteHandshake(conn); err != nil { |
| conn.Close() |
| return nil, errors.Annotate(err, "writing handshake").Err() |
| } |
| return conn, nil |
| } |
| |
| func (u *unixDialer) DialStream(forProcess bool, f streamproto.Flags) (io.WriteCloser, error) { |
| conn, err := u.conn(f) |
| if err != nil { |
| return nil, err |
| } |
| |
| if !forProcess { |
| return conn, nil |
| } |
| |
| fd, err := conn.File() |
| // either File dup'd our connection, or it failed; either way conn must be |
| // closed here. |
| conn.Close() |
| return fd, errors.Annotate(err, "converting to os.File").Err() |
| } |
| |
| func (u *unixDialer) DialDgramStream(f streamproto.Flags) (DatagramStream, error) { |
| conn, err := u.conn(f) |
| if err != nil { |
| return nil, err |
| } |
| return &datagramStreamWriter{conn}, nil |
| } |
| |
| func init() { |
| protocolRegistry["unix"] = func(address string) (dialer, error) { |
| // Ensure that the supplied address exists and is a named pipe. |
| info, err := os.Lstat(address) |
| if err != nil { |
| return nil, errors.Reason("failed to stat file [%s]: %s", address, err).Err() |
| } |
| if info.Mode()&os.ModeSocket == 0 { |
| return nil, errors.Reason("not a named pipe: [%s]", address).Err() |
| } |
| return &unixDialer{address}, nil |
| } |
| } |