831d483366
Rebase of the AWG obf graft (wase5feca7on v0.0.3) onto v0.0.5 (2c27bbf4f9, 'Add L3 forwarding support'). 15 of 16 graft files applied clean via 3-way; only send.go conflicted, on a single line (upstream queuedOutboundPackets backpressure decrement vs a graft blank line — took upstream). Key invariant preserved: MessageEncapsulatingTransportSize=0 (graft zeroes the sagernet encapsulating headroom; AWG obfuscation composes the prefix itself via SendBuffers, not Bind.Send prepend). Upstream's InputPacket/InputPackets and the new size-based outbound buffer pool (GetOutboundBuffer/PutOutboundBuffer) are taken verbatim; the graft's RoutineEncryption (header at buffer start) and transport-padding shift in RoutineSequentialSender re-woven around them. Builds clean on linux/android/windows/darwin (device/conn/tun).
63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
package device
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import (
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"crypto/rand"
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"errors"
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"fmt"
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"math/big"
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"strconv"
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"strings"
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)
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type magicHeader struct {
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start uint32
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end uint32
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}
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func newMagicHeader(spec string) (*magicHeader, error) {
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parts := strings.Split(spec, "-")
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if len(parts) < 1 || len(parts) > 2 {
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return nil, errors.New("bad format")
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}
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start, err := strconv.ParseUint(parts[0], 10, 32)
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if err != nil {
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return nil, fmt.Errorf("failed to parse %s: %w", parts[0], err)
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}
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var end uint64
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if len(parts) > 1 {
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end, err = strconv.ParseUint(parts[1], 10, 32)
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if err != nil {
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return nil, fmt.Errorf("failed to parse %s: %w", parts[1], err)
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}
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} else {
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end = start
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}
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if end < start {
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return nil, errors.New("wrong range specified")
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}
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return &magicHeader{
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start: uint32(start),
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end: uint32(end),
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}, nil
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}
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func (h *magicHeader) GenSpec() string {
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if h.start == h.end {
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return fmt.Sprintf("%d", h.start)
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}
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return fmt.Sprintf("%d-%d", h.start, h.end)
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}
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func (h *magicHeader) Validate(val uint32) bool {
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return h.start <= val && val <= h.end
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}
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func (h *magicHeader) Generate() uint32 {
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high := int64(h.end - h.start + 1)
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r, _ := rand.Int(rand.Reader, big.NewInt(high))
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return h.start + uint32(r.Int64())
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}
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