/usr/share/gocode/src/github.com/pkg/sftp/conn.go is in golang-github-pkg-sftp-dev 0.0~git20170704.0.e97b9a4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | package sftp
import (
"encoding"
"io"
"sync"
"github.com/pkg/errors"
)
// conn implements a bidirectional channel on which client and server
// connections are multiplexed.
type conn struct {
io.Reader
io.WriteCloser
sync.Mutex // used to serialise writes to sendPacket
// sendPacketTest is needed to replicate packet issues in testing
sendPacketTest func(w io.Writer, m encoding.BinaryMarshaler) error
}
func (c *conn) recvPacket() (uint8, []byte, error) {
return recvPacket(c)
}
func (c *conn) sendPacket(m encoding.BinaryMarshaler) error {
c.Lock()
defer c.Unlock()
if c.sendPacketTest != nil {
return c.sendPacketTest(c, m)
}
return sendPacket(c, m)
}
type clientConn struct {
conn
wg sync.WaitGroup
sync.Mutex // protects inflight
inflight map[uint32]chan<- result // outstanding requests
}
// Close closes the SFTP session.
func (c *clientConn) Close() error {
defer c.wg.Wait()
return c.conn.Close()
}
func (c *clientConn) loop() {
defer c.wg.Done()
err := c.recv()
if err != nil {
c.broadcastErr(err)
}
}
// recv continuously reads from the server and forwards responses to the
// appropriate channel.
func (c *clientConn) recv() error {
defer func() {
c.conn.Lock()
c.conn.Close()
c.conn.Unlock()
}()
for {
typ, data, err := c.recvPacket()
if err != nil {
return err
}
sid, _ := unmarshalUint32(data)
c.Lock()
ch, ok := c.inflight[sid]
delete(c.inflight, sid)
c.Unlock()
if !ok {
// This is an unexpected occurrence. Send the error
// back to all listeners so that they terminate
// gracefully.
return errors.Errorf("sid: %v not fond", sid)
}
ch <- result{typ: typ, data: data}
}
}
// result captures the result of receiving the a packet from the server
type result struct {
typ byte
data []byte
err error
}
type idmarshaler interface {
id() uint32
encoding.BinaryMarshaler
}
func (c *clientConn) sendPacket(p idmarshaler) (byte, []byte, error) {
ch := make(chan result, 1)
c.dispatchRequest(ch, p)
s := <-ch
return s.typ, s.data, s.err
}
func (c *clientConn) dispatchRequest(ch chan<- result, p idmarshaler) {
c.Lock()
c.inflight[p.id()] = ch
c.Unlock()
if err := c.conn.sendPacket(p); err != nil {
c.Lock()
delete(c.inflight, p.id())
c.Unlock()
ch <- result{err: err}
}
}
// broadcastErr sends an error to all goroutines waiting for a response.
func (c *clientConn) broadcastErr(err error) {
c.Lock()
listeners := make([]chan<- result, 0, len(c.inflight))
for _, ch := range c.inflight {
listeners = append(listeners, ch)
}
c.Unlock()
for _, ch := range listeners {
ch <- result{err: err}
}
}
type serverConn struct {
conn
}
func (s *serverConn) sendError(p ider, err error) error {
return s.sendPacket(statusFromError(p, err))
}
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