mirror of
https://github.com/sot-tech/mochi.git
synced 2026-06-14 00:23:35 -07:00
(untested) add salt to UDP connection ID
This commit is contained in:
Lawrence, Rendall
@@ -3,17 +3,17 @@ package udp
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import (
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"crypto/hmac"
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"encoding/binary"
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"github.com/cespare/xxhash/v2"
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"hash"
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"math/rand"
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"net/netip"
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"time"
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"github.com/zeebo/xxh3"
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"github.com/sot-tech/mochi/pkg/log"
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)
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// ttl is the duration a connection ID should be valid according to BEP 15.
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const ttl = 2 * time.Minute
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var ttl = int64(2 * time.Minute)
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// A ConnectionIDGenerator is a reusable generator and validator for connection
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// IDs as described in BEP 15.
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@@ -33,66 +33,102 @@ type ConnectionIDGenerator struct {
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// It will be overwritten by subsequent calls to Generate.
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connID []byte
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buff []byte
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// scratch is a 32-byte slice that is used as a scratchpad for the generated
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// HMACs.
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scratch []byte
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// the leeway for a timestamp on a connection ID.
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maxClockSkew time.Duration
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maxClockSkew int64
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cnt uint64
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}
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// NewConnectionIDGenerator creates a new connection ID generator.
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func NewConnectionIDGenerator(key string, maxClockSkew time.Duration) *ConnectionIDGenerator {
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return &ConnectionIDGenerator{
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mac: hmac.New(func() hash.Hash {
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return xxh3.New()
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return xxhash.New()
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}, []byte(key)),
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connID: make([]byte, 8),
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maxClockSkew: maxClockSkew,
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buff: make([]byte, 9),
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scratch: make([]byte, 16),
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maxClockSkew: int64(maxClockSkew),
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cnt: rand.Uint64(),
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}
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}
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// xor-shift-star generator
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func (g *ConnectionIDGenerator) nextCnt() uint64 {
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g.cnt ^= g.cnt >> 12
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g.cnt ^= g.cnt << 25
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g.cnt ^= g.cnt >> 27
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g.cnt *= 0x2545F4914F6CDD1D
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return g.cnt
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}
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// reset resets the generator.
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// This is called by other methods of the generator, it's not necessary to call
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// it after getting a generator from a pool.
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func (g *ConnectionIDGenerator) reset() {
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g.mac.Reset()
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g.connID = g.connID[:8]
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g.buff = g.buff[:9]
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g.scratch = g.scratch[:0]
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}
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// Generate generates an 8-byte connection ID as described in BEP 15 for the
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// given IP and the current time.
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//
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// The first 4 bytes of the connection identifier is a unix timestamp and the
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// last 4 bytes are a truncated HMAC token created from the aforementioned
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// unix timestamp and the source IP address of the UDP packet.
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// The first byte is random salt, next 2 bytes - truncated unix timestamp
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// when ID was generated, last 5 bytes are a truncated HMAC token created
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// from salt (1 byte), full unix timestamp (8 bytes) and source IP (4/16 bytes).
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// Salt used to mitigate generation same MAC if there are several clients
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// from same IP sent requests within one second.
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//
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// Truncated HMAC is known to be safe for 2^(-n) where n is the size in bits
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// of the truncated HMAC token. In this use case we have 32 bits, thus a
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// of the truncated HMAC token. In this use case we have 40 bits, thus a
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// forgery probability of approximately 1 in 4 billion.
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//
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// The generated ID is written to g.connID, which is also returned. g.connID
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// The generated ID is written to g.buffer, which is also returned. g.buffer
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// will be reused, so it must not be referenced after returning the generator
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// to a pool and will be overwritten be subsequent calls to Generate!
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func (g *ConnectionIDGenerator) Generate(ip netip.Addr, now time.Time) []byte {
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g.mac.Reset()
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binary.BigEndian.PutUint32(g.connID, uint32(now.Unix()))
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g.mac.Write(g.connID[:4])
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func (g *ConnectionIDGenerator) Generate(ip netip.Addr, now time.Time) (out []byte) {
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g.reset()
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g.buff[0] = byte(g.nextCnt())
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binary.BigEndian.PutUint64(g.buff[1:], uint64(now.Unix()))
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g.mac.Write(g.buff)
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g.mac.Write(ip.AsSlice())
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copy(g.connID[4:8], g.mac.Sum(nil)[:4])
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g.scratch = g.mac.Sum(g.scratch)
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g.connID[0], g.connID[1], g.connID[2] = g.buff[0], g.buff[7], g.buff[8]
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copy(g.connID[3:], g.scratch[:5])
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log.Debug().
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Stringer("ip", ip).
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Time("now", now).
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Hex("connID", g.connID).
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Msg("generated connection ID")
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return g.connID
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return g.connID[:8]
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}
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// Validate validates the given connection ID for an IP and the current time.
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func (g *ConnectionIDGenerator) Validate(connectionID []byte, ip netip.Addr, now time.Time) bool {
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g.mac.Reset()
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tsBytes := connectionID[:4]
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ts := time.Unix(int64(binary.BigEndian.Uint32(tsBytes)), 0)
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g.reset()
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nowTS := now.Unix()
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g.buff[0] = connectionID[0]
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ts := nowTS&((^int64(0)>>16)<<16) | int64(connectionID[1])<<8 | int64(connectionID[2])
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binary.BigEndian.PutUint64(g.buff[1:], uint64(ts))
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g.mac.Write(g.buff)
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g.mac.Write(ip.AsSlice())
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g.scratch = g.mac.Sum(g.scratch)
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res := hmac.Equal(g.scratch[:5], connectionID[3:8])
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res = ts-g.maxClockSkew <= nowTS && res
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res = nowTS < ts+ttl+g.maxClockSkew && res
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log.Debug().
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Stringer("ip", ip).
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Time("ts", ts).
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Time("now", now).
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Hex("connID", g.connID).
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Hex("connID", connectionID).
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Bool("result", res).
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Msg("validating connection ID")
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g.mac.Write(tsBytes)
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g.mac.Write(ip.AsSlice())
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return hmac.Equal(g.mac.Sum(nil)[:4], connectionID[4:8]) &&
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now.Before(ts.Add(ttl)) &&
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ts.Before(now.Add(g.maxClockSkew))
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return res
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}
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@@ -4,16 +4,17 @@ import (
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"crypto/hmac"
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"encoding/binary"
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"fmt"
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"github.com/cespare/xxhash/v2"
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"hash"
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"math/rand"
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"net/netip"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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"github.com/zeebo/xxh3"
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"github.com/sot-tech/mochi/pkg/log"
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_ "github.com/sot-tech/mochi/pkg/randseed"
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"github.com/stretchr/testify/require"
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)
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var golden = []struct {
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@@ -46,25 +47,26 @@ func ValidConnectionID(connectionID []byte, ip netip.Addr, now time.Time, maxClo
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// simpleNewConnectionID generates a new connection ID the explicit way.
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// This is used to verify correct behaviour of the generator.
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func simpleNewConnectionID(ip netip.Addr, now time.Time, key string) []byte {
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buf := make([]byte, 8)
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binary.BigEndian.PutUint32(buf, uint32(now.Unix()))
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buffer := make([]byte, 9)
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mac := hmac.New(func() hash.Hash {
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return xxh3.New()
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return xxhash.New()
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}, []byte(key))
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mac.Write(buf[:4])
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buffer[0] = byte(rand.Int())
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binary.BigEndian.PutUint64(buffer[1:], uint64(now.Unix()))
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mac.Write(buffer)
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mac.Write(ip.AsSlice())
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macBytes := mac.Sum(nil)[:4]
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copy(buf[4:], macBytes)
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buffer[0], buffer[1], buffer[2] = buffer[0], buffer[7], buffer[8]
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copy(buffer[3:8], mac.Sum(nil))
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buffer = buffer[:8]
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// this is just in here because logging impacts performance and we benchmark
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// this version too.
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log.Debug().
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Stringer("ip", ip).
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Time("now", now).
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Hex("connID", buf).
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Msg("manually generated connection ID")
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return buf
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Time("ts", now).
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Hex("connID", buffer).
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Msg("generated connection ID")
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return buffer
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}
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func TestVerification(t *testing.T) {
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@@ -24,8 +24,12 @@ import (
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"github.com/sot-tech/mochi/pkg/timecache"
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)
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// Name - registered name of the frontend
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const Name = "udp"
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const (
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// Name - registered name of the frontend
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Name = "udp"
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maxAllowedClockSkew = 30 * time.Second
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defaultMaxClockSkew = 10 * time.Second
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)
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var (
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logger = log.NewLogger("frontend/udp")
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@@ -62,7 +66,19 @@ func (cfg Config) Validate() (validCfg Config) {
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logger.Warn().
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Str("name", "PrivateKey").
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Str("provided", "").
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Str("key", validCfg.PrivateKey).
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Str("default", validCfg.PrivateKey).
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Msg("falling back to default configuration")
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}
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sb := cfg.MaxClockSkew >> 63
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validCfg.MaxClockSkew = (cfg.MaxClockSkew ^ sb) + (sb & 1)
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if validCfg.MaxClockSkew == 0 || validCfg.MaxClockSkew > maxAllowedClockSkew {
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validCfg.MaxClockSkew = defaultMaxClockSkew
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logger.Warn().
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Str("name", "MaxClockSkew").
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Dur("provided", cfg.MaxClockSkew).
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Dur("default", validCfg.MaxClockSkew).
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Msg("falling back to default configuration")
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}
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@@ -3,11 +3,12 @@ module github.com/sot-tech/mochi
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go 1.19
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require (
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code.cloudfoundry.org/go-diodes v0.0.0-20221122215814-f99b6a62c703
|
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github.com/MicahParks/keyfunc v1.6.0
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github.com/anacrolix/torrent v1.47.0
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code.cloudfoundry.org/go-diodes v0.0.0-20221128154616-f0ef2e038721
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github.com/MicahParks/keyfunc v1.7.0
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github.com/anacrolix/torrent v1.47.1-0.20221102120345-c63f7e1bd720
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github.com/cespare/xxhash/v2 v2.1.2
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github.com/go-redis/redis/v8 v8.11.5
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github.com/golang-jwt/jwt/v4 v4.4.2
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github.com/golang-jwt/jwt/v4 v4.4.3
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github.com/jackc/pgx/v5 v5.1.1
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github.com/julienschmidt/httprouter v1.3.0
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github.com/libp2p/go-reuseport v0.2.0
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@@ -16,18 +17,16 @@ require (
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github.com/prometheus/client_golang v1.14.0
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github.com/rs/zerolog v1.28.0
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github.com/stretchr/testify v1.8.1
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github.com/zeebo/xxh3 v1.0.2
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gopkg.in/yaml.v3 v3.0.1
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)
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require (
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github.com/anacrolix/dht/v2 v2.19.1 // indirect
|
||||
github.com/anacrolix/dht/v2 v2.19.2 // indirect
|
||||
github.com/anacrolix/log v0.13.2-0.20220711050817-613cb738ef30 // indirect
|
||||
github.com/anacrolix/missinggo v1.3.0 // indirect
|
||||
github.com/anacrolix/missinggo/v2 v2.7.1 // indirect
|
||||
github.com/beorn7/perks v1.0.1 // indirect
|
||||
github.com/bradfitz/iter v0.0.0-20191230175014-e8f45d346db8 // indirect
|
||||
github.com/cespare/xxhash/v2 v2.1.2 // indirect
|
||||
github.com/davecgh/go-spew v1.1.1 // indirect
|
||||
github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
|
||||
github.com/fsnotify/fsnotify v1.6.0 // indirect
|
||||
|
||||
@@ -30,15 +30,15 @@ cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0Zeo
|
||||
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
|
||||
cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
|
||||
cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
|
||||
code.cloudfoundry.org/go-diodes v0.0.0-20221122215814-f99b6a62c703 h1:AYI2TSzZnOwbxvCy1a2+AINk2d43J8+z4wVxt6YC364=
|
||||
code.cloudfoundry.org/go-diodes v0.0.0-20221122215814-f99b6a62c703/go.mod h1:kDqUxF0g8gENeHnd/Np+/ES9u2l00Maamk2ECzPd+lA=
|
||||
code.cloudfoundry.org/go-diodes v0.0.0-20221128154616-f0ef2e038721 h1:Dr3lCN4tcyMoX04sUwP9C0uCO5Uc+J11GWGVBNIJaYk=
|
||||
code.cloudfoundry.org/go-diodes v0.0.0-20221128154616-f0ef2e038721/go.mod h1:kDqUxF0g8gENeHnd/Np+/ES9u2l00Maamk2ECzPd+lA=
|
||||
crawshaw.io/iox v0.0.0-20181124134642-c51c3df30797/go.mod h1:sXBiorCo8c46JlQV3oXPKINnZ8mcqnye1EkVkqsectk=
|
||||
crawshaw.io/sqlite v0.3.2/go.mod h1:igAO5JulrQ1DbdZdtVq48mnZUBAPOeFzer7VhDWNtW4=
|
||||
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
|
||||
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
|
||||
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
|
||||
github.com/MicahParks/keyfunc v1.6.0 h1:VsoMTaQDCxaEYhlYVmuqkOopsDx12/XqIgJIz7cl/0g=
|
||||
github.com/MicahParks/keyfunc v1.6.0/go.mod h1:IdnCilugA0O/99dW+/MkvlyrsX8+L8+x95xuVNtM5jw=
|
||||
github.com/MicahParks/keyfunc v1.7.0 h1:LBd4tBj6FwGs2S4GXniQbgrG0PXzIldyGDKWch8slhg=
|
||||
github.com/MicahParks/keyfunc v1.7.0/go.mod h1:IdnCilugA0O/99dW+/MkvlyrsX8+L8+x95xuVNtM5jw=
|
||||
github.com/RoaringBitmap/roaring v0.4.7/go.mod h1:8khRDP4HmeXns4xIj9oGrKSz7XTQiJx2zgh7AcNke4w=
|
||||
github.com/RoaringBitmap/roaring v0.4.17/go.mod h1:D3qVegWTmfCaX4Bl5CrBE9hfrSrrXIr8KVNvRsDi1NI=
|
||||
github.com/RoaringBitmap/roaring v0.4.23/go.mod h1:D0gp8kJQgE1A4LQ5wFLggQEyvDi06Mq5mKs52e1TwOo=
|
||||
@@ -49,8 +49,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
|
||||
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
|
||||
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
|
||||
github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
|
||||
github.com/anacrolix/dht/v2 v2.19.1 h1:V/UUGBASGYqYkSnmHJwX8uQmzkyhbgwE6jqcHKnNTD8=
|
||||
github.com/anacrolix/dht/v2 v2.19.1/go.mod h1:3TU93c1s/oA8I/VH4m3CNP/BeKsiOGmo6HwfZBMTKUs=
|
||||
github.com/anacrolix/dht/v2 v2.19.2 h1:U+lbEFYwa9yajIW2oE9jBxt0K8DlT10pSTYbXyfCxC8=
|
||||
github.com/anacrolix/dht/v2 v2.19.2/go.mod h1:MctKM1HS5YYDb3F30NGJxLE+QPuqWoT5ReW/4jt8xew=
|
||||
github.com/anacrolix/envpprof v0.0.0-20180404065416-323002cec2fa/go.mod h1:KgHhUaQMc8cC0+cEflSgCFNFbKwi5h54gqtVn8yhP7c=
|
||||
github.com/anacrolix/envpprof v1.0.0/go.mod h1:KgHhUaQMc8cC0+cEflSgCFNFbKwi5h54gqtVn8yhP7c=
|
||||
github.com/anacrolix/envpprof v1.1.0/go.mod h1:My7T5oSqVfEn4MD4Meczkw/f5lSIndGAKu/0SM/rkf4=
|
||||
@@ -73,8 +73,8 @@ github.com/anacrolix/stm v0.2.0/go.mod h1:zoVQRvSiGjGoTmbM0vSLIiaKjWtNPeTvXUSdJQ
|
||||
github.com/anacrolix/tagflag v0.0.0-20180109131632-2146c8d41bf0/go.mod h1:1m2U/K6ZT+JZG0+bdMK6qauP49QT4wE5pmhJXOKKCHw=
|
||||
github.com/anacrolix/tagflag v1.0.0/go.mod h1:1m2U/K6ZT+JZG0+bdMK6qauP49QT4wE5pmhJXOKKCHw=
|
||||
github.com/anacrolix/tagflag v1.1.0/go.mod h1:Scxs9CV10NQatSmbyjqmqmeQNwGzlNe0CMUMIxqHIG8=
|
||||
github.com/anacrolix/torrent v1.47.0 h1:aDUnhQZ8+kfStLICHiXOGGYVFgDENK+kz4q96linyRg=
|
||||
github.com/anacrolix/torrent v1.47.0/go.mod h1:SYPxEUjMwqhDr3kWGzyQLkFMuAb1bgJ57JRMpuD3ZzE=
|
||||
github.com/anacrolix/torrent v1.47.1-0.20221102120345-c63f7e1bd720 h1:3cvS7QtC2hcrIOfT44fKDfPZUcXvkDf9SkI1mN6TB+s=
|
||||
github.com/anacrolix/torrent v1.47.1-0.20221102120345-c63f7e1bd720/go.mod h1:SYPxEUjMwqhDr3kWGzyQLkFMuAb1bgJ57JRMpuD3ZzE=
|
||||
github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
|
||||
github.com/benbjohnson/immutable v0.2.0/go.mod h1:uc6OHo6PN2++n98KHLxW8ef4W42ylHiQSENghE1ezxI=
|
||||
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
|
||||
@@ -141,8 +141,9 @@ github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg78
|
||||
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
|
||||
github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
|
||||
github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
|
||||
github.com/golang-jwt/jwt/v4 v4.4.2 h1:rcc4lwaZgFMCZ5jxF9ABolDcIHdBytAFgqFPbSJQAYs=
|
||||
github.com/golang-jwt/jwt/v4 v4.4.2/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=
|
||||
github.com/golang-jwt/jwt/v4 v4.4.3 h1:Hxl6lhQFj4AnOX6MLrsCb/+7tCj7DxP7VA+2rDIq5AU=
|
||||
github.com/golang-jwt/jwt/v4 v4.4.3/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0=
|
||||
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
|
||||
github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
|
||||
github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
|
||||
@@ -367,9 +368,6 @@ github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
|
||||
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
|
||||
github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
|
||||
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
|
||||
github.com/zeebo/assert v1.3.0 h1:g7C04CbJuIDKNPFHmsk4hwZDO5O+kntRxzaUoNXj+IQ=
|
||||
github.com/zeebo/xxh3 v1.0.2 h1:xZmwmqxHZA8AI603jOQ0tMqmBr9lPeFwGg6d+xy9DC0=
|
||||
github.com/zeebo/xxh3 v1.0.2/go.mod h1:5NWz9Sef7zIDm2JHfFlcQvNekmcEl9ekUZQQKCYaDcA=
|
||||
go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
|
||||
go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
|
||||
go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
|
||||
|
||||
Reference in New Issue
Block a user