From 8c12c6939aab9106db14ec2d11d983bc5b29fb2c Mon Sep 17 00:00:00 2001 From: Niall Sheridan Date: Sun, 7 Jul 2019 21:33:44 +0100 Subject: Switch to modules --- vendor/golang.org/x/crypto/ssh/mux.go | 330 ---------------------------------- 1 file changed, 330 deletions(-) delete mode 100644 vendor/golang.org/x/crypto/ssh/mux.go (limited to 'vendor/golang.org/x/crypto/ssh/mux.go') diff --git a/vendor/golang.org/x/crypto/ssh/mux.go b/vendor/golang.org/x/crypto/ssh/mux.go deleted file mode 100644 index f190162..0000000 --- a/vendor/golang.org/x/crypto/ssh/mux.go +++ /dev/null @@ -1,330 +0,0 @@ -// Copyright 2013 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package ssh - -import ( - "encoding/binary" - "fmt" - "io" - "log" - "sync" - "sync/atomic" -) - -// debugMux, if set, causes messages in the connection protocol to be -// logged. -const debugMux = false - -// chanList is a thread safe channel list. -type chanList struct { - // protects concurrent access to chans - sync.Mutex - - // chans are indexed by the local id of the channel, which the - // other side should send in the PeersId field. - chans []*channel - - // This is a debugging aid: it offsets all IDs by this - // amount. This helps distinguish otherwise identical - // server/client muxes - offset uint32 -} - -// Assigns a channel ID to the given channel. -func (c *chanList) add(ch *channel) uint32 { - c.Lock() - defer c.Unlock() - for i := range c.chans { - if c.chans[i] == nil { - c.chans[i] = ch - return uint32(i) + c.offset - } - } - c.chans = append(c.chans, ch) - return uint32(len(c.chans)-1) + c.offset -} - -// getChan returns the channel for the given ID. -func (c *chanList) getChan(id uint32) *channel { - id -= c.offset - - c.Lock() - defer c.Unlock() - if id < uint32(len(c.chans)) { - return c.chans[id] - } - return nil -} - -func (c *chanList) remove(id uint32) { - id -= c.offset - c.Lock() - if id < uint32(len(c.chans)) { - c.chans[id] = nil - } - c.Unlock() -} - -// dropAll forgets all channels it knows, returning them in a slice. -func (c *chanList) dropAll() []*channel { - c.Lock() - defer c.Unlock() - var r []*channel - - for _, ch := range c.chans { - if ch == nil { - continue - } - r = append(r, ch) - } - c.chans = nil - return r -} - -// mux represents the state for the SSH connection protocol, which -// multiplexes many channels onto a single packet transport. -type mux struct { - conn packetConn - chanList chanList - - incomingChannels chan NewChannel - - globalSentMu sync.Mutex - globalResponses chan interface{} - incomingRequests chan *Request - - errCond *sync.Cond - err error -} - -// When debugging, each new chanList instantiation has a different -// offset. -var globalOff uint32 - -func (m *mux) Wait() error { - m.errCond.L.Lock() - defer m.errCond.L.Unlock() - for m.err == nil { - m.errCond.Wait() - } - return m.err -} - -// newMux returns a mux that runs over the given connection. -func newMux(p packetConn) *mux { - m := &mux{ - conn: p, - incomingChannels: make(chan NewChannel, chanSize), - globalResponses: make(chan interface{}, 1), - incomingRequests: make(chan *Request, chanSize), - errCond: newCond(), - } - if debugMux { - m.chanList.offset = atomic.AddUint32(&globalOff, 1) - } - - go m.loop() - return m -} - -func (m *mux) sendMessage(msg interface{}) error { - p := Marshal(msg) - if debugMux { - log.Printf("send global(%d): %#v", m.chanList.offset, msg) - } - return m.conn.writePacket(p) -} - -func (m *mux) SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) { - if wantReply { - m.globalSentMu.Lock() - defer m.globalSentMu.Unlock() - } - - if err := m.sendMessage(globalRequestMsg{ - Type: name, - WantReply: wantReply, - Data: payload, - }); err != nil { - return false, nil, err - } - - if !wantReply { - return false, nil, nil - } - - msg, ok := <-m.globalResponses - if !ok { - return false, nil, io.EOF - } - switch msg := msg.(type) { - case *globalRequestFailureMsg: - return false, msg.Data, nil - case *globalRequestSuccessMsg: - return true, msg.Data, nil - default: - return false, nil, fmt.Errorf("ssh: unexpected response to request: %#v", msg) - } -} - -// ackRequest must be called after processing a global request that -// has WantReply set. -func (m *mux) ackRequest(ok bool, data []byte) error { - if ok { - return m.sendMessage(globalRequestSuccessMsg{Data: data}) - } - return m.sendMessage(globalRequestFailureMsg{Data: data}) -} - -func (m *mux) Close() error { - return m.conn.Close() -} - -// loop runs the connection machine. It will process packets until an -// error is encountered. To synchronize on loop exit, use mux.Wait. -func (m *mux) loop() { - var err error - for err == nil { - err = m.onePacket() - } - - for _, ch := range m.chanList.dropAll() { - ch.close() - } - - close(m.incomingChannels) - close(m.incomingRequests) - close(m.globalResponses) - - m.conn.Close() - - m.errCond.L.Lock() - m.err = err - m.errCond.Broadcast() - m.errCond.L.Unlock() - - if debugMux { - log.Println("loop exit", err) - } -} - -// onePacket reads and processes one packet. -func (m *mux) onePacket() error { - packet, err := m.conn.readPacket() - if err != nil { - return err - } - - if debugMux { - if packet[0] == msgChannelData || packet[0] == msgChannelExtendedData { - log.Printf("decoding(%d): data packet - %d bytes", m.chanList.offset, len(packet)) - } else { - p, _ := decode(packet) - log.Printf("decoding(%d): %d %#v - %d bytes", m.chanList.offset, packet[0], p, len(packet)) - } - } - - switch packet[0] { - case msgChannelOpen: - return m.handleChannelOpen(packet) - case msgGlobalRequest, msgRequestSuccess, msgRequestFailure: - return m.handleGlobalPacket(packet) - } - - // assume a channel packet. - if len(packet) < 5 { - return parseError(packet[0]) - } - id := binary.BigEndian.Uint32(packet[1:]) - ch := m.chanList.getChan(id) - if ch == nil { - return fmt.Errorf("ssh: invalid channel %d", id) - } - - return ch.handlePacket(packet) -} - -func (m *mux) handleGlobalPacket(packet []byte) error { - msg, err := decode(packet) - if err != nil { - return err - } - - switch msg := msg.(type) { - case *globalRequestMsg: - m.incomingRequests <- &Request{ - Type: msg.Type, - WantReply: msg.WantReply, - Payload: msg.Data, - mux: m, - } - case *globalRequestSuccessMsg, *globalRequestFailureMsg: - m.globalResponses <- msg - default: - panic(fmt.Sprintf("not a global message %#v", msg)) - } - - return nil -} - -// handleChannelOpen schedules a channel to be Accept()ed. -func (m *mux) handleChannelOpen(packet []byte) error { - var msg channelOpenMsg - if err := Unmarshal(packet, &msg); err != nil { - return err - } - - if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 { - failMsg := channelOpenFailureMsg{ - PeersID: msg.PeersID, - Reason: ConnectionFailed, - Message: "invalid request", - Language: "en_US.UTF-8", - } - return m.sendMessage(failMsg) - } - - c := m.newChannel(msg.ChanType, channelInbound, msg.TypeSpecificData) - c.remoteId = msg.PeersID - c.maxRemotePayload = msg.MaxPacketSize - c.remoteWin.add(msg.PeersWindow) - m.incomingChannels <- c - return nil -} - -func (m *mux) OpenChannel(chanType string, extra []byte) (Channel, <-chan *Request, error) { - ch, err := m.openChannel(chanType, extra) - if err != nil { - return nil, nil, err - } - - return ch, ch.incomingRequests, nil -} - -func (m *mux) openChannel(chanType string, extra []byte) (*channel, error) { - ch := m.newChannel(chanType, channelOutbound, extra) - - ch.maxIncomingPayload = channelMaxPacket - - open := channelOpenMsg{ - ChanType: chanType, - PeersWindow: ch.myWindow, - MaxPacketSize: ch.maxIncomingPayload, - TypeSpecificData: extra, - PeersID: ch.localId, - } - if err := m.sendMessage(open); err != nil { - return nil, err - } - - switch msg := (<-ch.msg).(type) { - case *channelOpenConfirmMsg: - return ch, nil - case *channelOpenFailureMsg: - return nil, &OpenChannelError{msg.Reason, msg.Message} - default: - return nil, fmt.Errorf("ssh: unexpected packet in response to channel open: %T", msg) - } -} -- cgit v1.2.3