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add transport, handshake transport and server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,139 +1,24 @@ | ||
| package dtls | ||
|
|
||
| import ( | ||
| "io" | ||
| "net" | ||
| ) | ||
|
|
||
| type Conn struct { | ||
| net.Conn | ||
| config *Config | ||
| rx receiver | ||
| tx transmitter | ||
| *transport | ||
| } | ||
|
|
||
| func newConn(c net.Conn, config *Config) *Conn { | ||
| if config == nil { | ||
| config = DefaultConfig | ||
| config = defaultConfig | ||
| } | ||
| return &Conn{ | ||
| c, | ||
| config, | ||
| receiver{r: c}, | ||
| transmitter{w: c, mtu: config.MTU}, | ||
| &transport{Conn: c, config: config}, | ||
| } | ||
| } | ||
|
|
||
| func (c *Conn) newHandshake() *handshakeProtocol { | ||
| return &handshakeProtocol{ | ||
| Conn: c, | ||
| enc: handshakeEncoder{ | ||
| mtu: c.config.MTU, | ||
| seq: 0, | ||
| }, | ||
| dec: handshakeDecoder{ | ||
| seq: 0, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func (c *Conn) sendAlert(a uint8) error { | ||
| return c.tx.write(&record{ | ||
| typ: recordAlert, | ||
| ver: VersionDTLS10, | ||
| raw: []byte{levelError, a}, | ||
| }) | ||
| } | ||
|
|
||
| func (c *Conn) Close() error { | ||
| // TODO: send alert only if handshake done | ||
| c.sendAlert(alertCloseNotify) | ||
| return c.Conn.Close() | ||
| } | ||
|
|
||
| type receiver struct { | ||
| r io.Reader | ||
| epoch uint16 | ||
| seq int64 | ||
| mask int64 | ||
| buf []byte | ||
| raw []byte | ||
| } | ||
|
|
||
| func (rx *receiver) read() (r *record, err error) { | ||
| if rx.buf == nil { | ||
| rx.buf = make([]byte, 4096) | ||
| } | ||
| for { | ||
| if len(rx.raw) > 0 { | ||
| r, rx.raw, err = parseRecord(rx.raw) | ||
| if err == nil && rx.check(r) { | ||
| return r, nil | ||
| } | ||
| } | ||
| n, err := rx.r.Read(rx.buf) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| rx.raw = rx.buf[:n] | ||
| } | ||
| } | ||
|
|
||
| func (rx *receiver) check(r *record) bool { | ||
| if r.epoch != rx.epoch { | ||
| return false | ||
| } | ||
| d := r.seq - rx.seq | ||
| if d > 0 { | ||
| if d < 64 { | ||
| rx.mask = (rx.mask << uint(d)) | 1 | ||
| } else { | ||
| rx.mask = 1 | ||
| } | ||
| rx.seq = r.seq | ||
| return true | ||
| } | ||
| if d = -d; d >= 64 { | ||
| return false | ||
| } | ||
| if b := int64(1) << uint(d); rx.mask&b == 0 { | ||
| rx.mask |= b | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| type transmitter struct { | ||
| w io.Writer | ||
| mtu int | ||
| epoch uint16 | ||
| seq int64 | ||
| } | ||
|
|
||
| func (tx *transmitter) write(r *record) error { | ||
| r.epoch, r.seq = tx.epoch, tx.seq | ||
| tx.seq++ | ||
| _, err := tx.w.Write(r.marshal(nil)) | ||
| return err | ||
| } | ||
|
|
||
| func (tx *transmitter) writeFlight(raw []byte, rec []int) (err error) { | ||
| last, sent := 0, 0 | ||
| for _, to := range rec { | ||
| v := raw[last:to] | ||
| put6(v[5:], tx.seq) | ||
| tx.seq++ | ||
| if to-sent > tx.mtu { | ||
| if _, err = tx.w.Write(raw[sent:last]); err != nil { | ||
| return | ||
| } | ||
| sent = last | ||
| } | ||
| last = to | ||
| } | ||
| if sent == last { | ||
| return nil | ||
| } | ||
| _, err = tx.w.Write(raw[sent:last]) | ||
| return | ||
| } |
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