From 365222b1bf6e87e03a1ba671c1eb2ab3abd875f0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Micha=C5=82=20Adamski?= Date: Sun, 6 Dec 2020 22:36:57 +0100 Subject: [PATCH] start --- .gitignore | 3 + Makefile | 5 ++ go.mod | 20 +++++++ go.sum | 134 +++++++++++++++++++++++++++++++++++++++++++++ main.go | 104 +++++++++++++++++++++++++++++++++++ storage.go | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 424 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 storage.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9bcc9b0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +web +privtracker +config.json diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..ee02f05 --- /dev/null +++ b/Makefile @@ -0,0 +1,5 @@ +build: + go build -ldflags="-s -w" -trimpath + +deploy: build + rsync -avzL web privtracker privtracker: diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..1c9e528 --- /dev/null +++ b/go.mod @@ -0,0 +1,20 @@ +module privtracker + +go 1.15 + +require ( + github.com/gin-gonic/gin v1.6.3 + github.com/go-playground/validator/v10 v10.4.1 // indirect + github.com/golang/protobuf v1.4.3 // indirect + github.com/google/go-cmp v0.5.3 // indirect + github.com/jackpal/bencode-go v1.0.0 + github.com/json-iterator/go v1.1.10 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.1 // indirect + github.com/stretchr/testify v1.6.1 // indirect + github.com/ugorji/go v1.2.0 // indirect + golang.org/x/crypto v0.0.0-20201124201722-c8d3bf9c5392 // indirect + golang.org/x/sys v0.0.0-20201202213521-69691e467435 // indirect + google.golang.org/protobuf v1.25.0 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..cd5046b --- /dev/null +++ b/go.sum @@ -0,0 +1,134 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= +github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE= +github.com/gin-contrib/sse 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v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go new file mode 100644 index 0000000..5ba49dd --- /dev/null +++ b/main.go @@ -0,0 +1,104 @@ +package main + +import ( + "github.com/gin-gonic/gin" + "github.com/jackpal/bencode-go" +) + +func main() { + r := gin.Default() + r.GET("/:room/announce", announce) + r.GET("/:room/scrape", scrape) + go Cleanup() + r.Run() +} + +type AnnounceRequest struct { + InfoHash string `form:"info_hash"` + PeerID string `form:"peer_id"` + IP string `form:"ip"` + Port uint16 `form:"port"` + Uploaded uint `form:"uploaded"` + Downloaded uint `form:"downloaded"` + Left uint `form:"left"` + Numwant uint `form:"numwant"` + Key string `form:"key"` + Compact bool `form:"compact"` + SupportCrypto bool `form:"supportcrypto"` + Event string `form:"event"` +} + +func (req *AnnounceRequest) IsSeeding() bool { + return req.Left == 0 +} + +type AnnounceResponse struct { + Interval int `bencode:"interval"` + Complete int `bencode:"complete"` + Incomplete int `bencode:"incomplete"` + Peers string `bencode:"peers"` + PeersIPv6 string `bencode:"peers_ipv6"` +} + +func announce(c *gin.Context) { + req := new(AnnounceRequest) + c.BindQuery(req) + // if req.IP == "" { + req.IP = c.ClientIP() // not sure if ip from request should be honored + // } + if req.Numwant == 0 { + req.Numwant = 30 + } + switch req.Event { + case "stopped": + DeletePeer(c.Param("room"), req.InfoHash, req.IP, req.Port) + case "completed": + GraduateLeecher(c.Param("room"), req.InfoHash, req.IP, req.Port) + default: + PutPeer(c.Param("room"), req.InfoHash, req.IP, req.Port, req.IsSeeding()) + } + peersv4, peersv6, numSeeders, numLeechers := GetPeers(c.Param("room"), req.InfoHash, req.Numwant, req.IsSeeding()) + resp := AnnounceResponse{ + Interval: 120, + Complete: numSeeders, + Incomplete: numLeechers, + Peers: string(peersv4), + PeersIPv6: string(peersv6), + } + if err := bencode.Marshal(c.Writer, resp); err != nil { + c.Error(err) + return + } +} + +type ScrapeRequest struct { + InfoHash string `form:"info_hash"` +} + +type ScrapeResponse struct { + Files map[string]Stat `bencode:"files"` +} + +type Stat struct { + Complete int `bencode:"complete"` + Incomplete int `bencode:"incomplete"` + // Downloaded uint `bencode:"downloaded"` +} + +func scrape(c *gin.Context) { + req := new(ScrapeRequest) + c.BindQuery(req) + numSeeders, numLeechers := GetStats(c.Param("room"), req.InfoHash) + resp := ScrapeResponse{ + Files: map[string]Stat{ + req.InfoHash: { + Complete: numSeeders, + Incomplete: numLeechers, + }, + }, + } + if err := bencode.Marshal(c.Writer, resp); err != nil { + c.Error(err) + return + } +} diff --git a/storage.go b/storage.go new file mode 100644 index 0000000..5d0c3d2 --- /dev/null +++ b/storage.go @@ -0,0 +1,158 @@ +package main + +import ( + "bytes" + "crypto/sha1" + "encoding/binary" + "net" + "sync" + "time" +) + +type serializedPeer string +type hash [20]byte + +type shard struct { + swarms map[hash]swarm + sync.RWMutex +} + +type swarm struct { + seeders map[serializedPeer]int64 + leechers map[serializedPeer]int64 +} + +var shards = NewShards(512) +var v4InV6Prefix = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff} + +func shardIndex(hash [20]byte) int { + return int(binary.BigEndian.Uint32(hash[:4])) % len(shards) +} + +func NewShards(size int) []*shard { + shards := make([]*shard, size) + for i := 0; i < size; i++ { + shards[i] = &shard{ + swarms: make(map[hash]swarm), + } + } + return shards +} + +func serialize(ip string, port uint16) serializedPeer { + return serializedPeer(append(net.ParseIP(ip), byte(port>>8), byte(port))) +} + +func PutPeer(room, infoHash string, ip string, port uint16, seeding bool) { + h := sha1.Sum([]byte(room + infoHash)) + shard := shards[shardIndex(h)] + shard.Lock() + if _, ok := shard.swarms[h]; !ok { + shard.swarms[h] = swarm{ + seeders: make(map[serializedPeer]int64), + leechers: make(map[serializedPeer]int64), + } + } + serialized := serialize(ip, port) + if seeding { + shard.swarms[h].seeders[serialized] = time.Now().Unix() + } else { + shard.swarms[h].leechers[serialized] = time.Now().Unix() + } + shard.Unlock() +} + +func DeletePeer(room, infoHash string, ip string, port uint16) { + h := sha1.Sum([]byte(room + infoHash)) + shard := shards[shardIndex(h)] + shard.Lock() + if _, ok := shard.swarms[h]; !ok { + return + } + serialized := serialize(ip, port) + delete(shard.swarms[h].seeders, serialized) + delete(shard.swarms[h].leechers, serialized) + shard.Unlock() +} + +func GraduateLeecher(room, infoHash string, ip string, port uint16) { + h := sha1.Sum([]byte(room + infoHash)) + shard := shards[shardIndex(h)] + shard.Lock() + if _, ok := shard.swarms[h]; !ok { + shard.swarms[h] = swarm{ + seeders: make(map[serializedPeer]int64), + leechers: make(map[serializedPeer]int64), + } + } + serialized := serialize(ip, port) + shard.swarms[h].seeders[serialized] = time.Now().Unix() + delete(shard.swarms[h].leechers, serialized) + shard.Unlock() +} + +func GetPeers(room, infoHash string, numWant uint, seeding bool) (peersv4, peersv6 []byte, numSeeders, numLeechers int) { + h := sha1.Sum([]byte(room + infoHash)) + shard := shards[shardIndex(h)] + shard.RLock() + if seeding { + peersv4, peersv6 = getPeersFromSwarm(numWant, shard.swarms[h].leechers) + } else { + peersv4, peersv6 = getPeersFromSwarm(numWant, shard.swarms[h].seeders) + } + numSeeders = len(shard.swarms[h].seeders) + numLeechers = len(shard.swarms[h].leechers) + shard.RUnlock() + return +} + +func getPeersFromSwarm(numWant uint, peers map[serializedPeer]int64) (peersv4, peersv6 []byte) { + for serialized := range peers { + if numWant == 0 { + break + } + if bytes.HasPrefix([]byte(serialized), v4InV6Prefix) { + peersv4 = append(peersv4, serialized[12:]...) + } else { + peersv6 = append(peersv6, serialized...) + } + numWant-- + } + return +} + +func GetStats(room, infoHash string) (numSeeders, numLeechers int) { + h := sha1.Sum([]byte(room + infoHash)) + shard := shards[shardIndex(h)] + shard.RLock() + numSeeders = len(shard.swarms[h].seeders) + numLeechers = len(shard.swarms[h].leechers) + shard.RUnlock() + return +} + +func Cleanup() { + for { + expiration := time.Now().Unix() - 600 + for _, shard := range shards { + shard.Lock() + for h, swarm := range shard.swarms { + for peer, lastSeen := range swarm.seeders { + if lastSeen < expiration { + delete(swarm.seeders, peer) + } + } + for peer, lastSeen := range swarm.leechers { + if lastSeen < expiration { + delete(swarm.leechers, peer) + } + } + if len(swarm.leechers) == 0 && len(swarm.seeders) == 0 { + delete(shard.swarms, h) + } + } + shard.Unlock() + } + time.Sleep(time.Minute * 3) + } +}