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disco: call-me-maybe timestamp experiment

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Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2023-12-08 17:04:19 -08:00
parent a217f1fccf
commit 2f529d7120
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GPG Key ID: 33DF352F65991EB8
1 changed files with 13 additions and 4 deletions

17
disco/disco.go

@ -23,11 +23,11 @@ import (
"encoding/binary"
"errors"
"fmt"
"go4.org/mem"
"net"
"net/netip"
"go4.org/mem"
"tailscale.com/types/key"
"time"
)
// Magic is the 6 byte header of all discovery messages.
@ -193,7 +193,11 @@ type CallMeMaybe struct {
const epLength = 16 + 2 // 16 byte IP address + 2 byte port
func (m *CallMeMaybe) AppendMarshal(b []byte) []byte {
ret, p := appendMsgHeader(b, TypeCallMeMaybe, v0, epLength*len(m.MyNumber))
ret, p := appendMsgHeader(b, TypeCallMeMaybe, 1, 8+(epLength*len(m.MyNumber)))
t := time.Now().Unix()
fmt.Printf("JORDAN: putting timestamp %s in call-me-maybe\n", time.Unix(t, 0))
binary.BigEndian.PutUint64(p, uint64(t))
p = p[8:]
for _, ipp := range m.MyNumber {
a := ipp.Addr().As16()
copy(p[:], a[:])
@ -205,7 +209,12 @@ func (m *CallMeMaybe) AppendMarshal(b []byte) []byte {
func parseCallMeMaybe(ver uint8, p []byte) (m *CallMeMaybe, err error) {
m = new(CallMeMaybe)
if len(p)%epLength != 0 || ver != 0 || len(p) == 0 {
if ver == 1 {
u := binary.BigEndian.Uint64(p)
t := time.Unix(int64(u), 0)
fmt.Printf("JORDAN: call-me-maybe has timestamp: %s\n", t)
p = p[8:]
} else if len(p)%epLength != 0 || ver != 0 || len(p) == 0 {
return m, nil
}
m.MyNumber = make([]netip.AddrPort, 0, len(p)/epLength)