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handle clientsynseg

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This commit is contained in:
soypat
2025-02-13 23:19:19 -03:00
parent bbd74d04d8
commit 6b91d8e510
3 changed files with 13 additions and 14 deletions
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examples/stack/main.go
+1 -1
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@@ -41,7 +41,7 @@ func main() {
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
err = pStack.handler.Open(tcp.StateListen, gen.DstTCP, gen.SrcTCP, iss) err = pStack.handler.Open(gen.DstTCP, iss)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
tcp/control.go
+1 -1
View File
@@ -138,7 +138,7 @@ type recvSpace struct {
WND Size // receive window defined by local. Permitted number of remote unacked octets in flight. WND Size // receive window defined by local. Permitted number of remote unacked octets in flight.
} }
// Open implements a passive opening of a connection (wait for incoming packets). // Open implements a passive opening of a connection (wait for incoming packets from an unknown remote port).
// Upon success [ControlBlock] enters LISTEN state, such as that of a server. // Upon success [ControlBlock] enters LISTEN state, such as that of a server.
// To open an active connection use [ControlBlock.Send] with a segment generated with [ClientSynSegment]. // To open an active connection use [ControlBlock.Send] with a segment generated with [ClientSynSegment].
func (tcb *ControlBlock) Open(iss Value, wnd Size) (err error) { func (tcb *ControlBlock) Open(iss Value, wnd Size) (err error) {
tcp/handler.go
+11 -12
View File
@@ -51,7 +51,8 @@ func (h *Handler) LocalPort() uint16 {
return h.localPort return h.localPort
} }
func (h *Handler) Open(state State, localPort, remotePort uint16, iss Value) error { // Open prepares a passive connection. Set remote port to non-zero to
func (h *Handler) Open(localPort uint16, iss Value) error {
// Open will fail unless SCB in closed state. // Open will fail unless SCB in closed state.
err := h.scb.Open(iss, Size(h.bufRx.Size())) err := h.scb.Open(iss, Size(h.bufRx.Size()))
if err != nil { if err != nil {
@@ -63,7 +64,7 @@ func (h *Handler) Open(state State, localPort, remotePort uint16, iss Value) err
bufRx: h.bufRx, bufRx: h.bufRx,
connid: h.connid + 1, connid: h.connid + 1,
localPort: localPort, localPort: localPort,
remotePort: remotePort, remotePort: 0,
validator: h.validator, validator: h.validator,
logger: h.logger, logger: h.logger,
closing: false, closing: false,
@@ -139,15 +140,9 @@ func (h *Handler) Send(b []byte) (int, error) {
return 0, err return 0, err
} }
var segment Segment var segment Segment
if h.AwaitingSyn() { if h.AwaitingSynSend() {
// Handling init syn segment. // Handling init syn segment.
segment = Segment{ segment = ClientSynSegment(h.scb.ISS(), h.scb.RecvWindow())
SEQ: h.scb.ISS(),
ACK: 0,
Flags: FlagSYN,
WND: h.scb.RecvWindow(),
DATALEN: 0,
}
} else { } else {
var ok bool var ok bool
available := min(h.bufTx.Buffered(), len(b)-sizeHeaderTCP) available := min(h.bufTx.Buffered(), len(b)-sizeHeaderTCP)
@@ -181,11 +176,15 @@ func (h *Handler) Send(b []byte) (int, error) {
return sizeHeaderTCP + int(segment.DATALEN), nil return sizeHeaderTCP + int(segment.DATALEN), nil
} }
// AwaitingSyn checks if the Handler is waiting for a Syn to arrive. // AwaitingSynResponse checks if the Handler is waiting for a Syn to arrive.
func (h *Handler) AwaitingSyn() bool { func (h *Handler) AwaitingSynResponse() bool {
return h.remotePort != 0 && h.scb.State() == StateSynSent return h.remotePort != 0 && h.scb.State() == StateSynSent
} }
func (h *Handler) AwaitingSynSend() bool {
return h.remotePort != 0 && h.scb.State() == StateClosed
}
func (h *Handler) isClosed() bool { func (h *Handler) isClosed() bool {
return h.closing || h.scb.State().IsClosed() return h.closing || h.scb.State().IsClosed()
} }