init project
Kim committed
Oct 20, 2025 at 18:41 UTC
54a4f0b01438e8184e6da71589a2067fe20cbfae
5 files changed
+1093
cmd/server.go
new
+80
@@ -0,0 +1,80 @@
1
+package main
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+
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+import (
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+ "context"
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+ "log"
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+ "os"
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+ "os/signal"
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+ "syscall"
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+ "time"
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+
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+ "github.com/gosuda/relaydns/pkg"
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+ "github.com/spf13/cobra"
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+)
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+
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+var rootCmd = &cobra.Command{
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+ Use: "relayserver",
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+ Short: "A lightweight, DNS-driven peer-to-peer proxy layer built on libp2p",
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+ RunE: runServer,
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+}
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+
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+var (
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+ flagBootstraps []string
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+ flagRelay bool
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+ listenTCP string
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+ listenHTTP string
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+ protocol string
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+ topic string
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+)
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+
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+func init() {
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+ flags := rootCmd.PersistentFlags()
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+ flags.StringSliceVar(&flagBootstraps, "bootstrap", nil, "multiaddrs with /p2p/ (supports /dnsaddr/ that resolves to /p2p/)")
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+ flags.BoolVar(&flagRelay, "relay", true, "enable libp2p relay support")
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+ flags.StringVar(&listenTCP, "listen-tcp", ":22", "TCP listen (e.g. :22 for SSH)")
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+ flags.StringVar(&listenHTTP, "listen-http", ":8080", "HTTP admin API")
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+ flags.StringVar(&protocol, "protocol", "/relaydns/ssh/1.0", "libp2p protocol id for streams")
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+ flags.StringVar(&topic, "topic", "relaydns.backends", "pubsub topic for adverts")
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+}
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+
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+func main() {
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+ if err := rootCmd.Execute(); err != nil {
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+ log.Fatal(err)
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+ }
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+}
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+
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+func runServer(cmd *cobra.Command, args []string) error {
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+ ctx, cancel := context.WithCancel(context.Background())
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+ defer cancel()
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+ h, err := pkg.MakeHost(ctx, flagRelay)
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+ if err != nil {
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+ return err
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+ }
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+ pkg.ConnectBootstraps(ctx, h, flagBootstraps)
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+
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+ d, err := pkg.NewDirector(ctx, h, protocol, topic)
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+ if err != nil {
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+ return err
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+ }
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+
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+ go func() {
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+ if err := d.ServeHTTP(listenHTTP); err != nil {
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+ log.Println("http api:", err)
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+ cancel()
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+ }
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+ }()
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+ go func() {
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+ if err := d.ServeTCP(listenTCP); err != nil {
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+ log.Println("tcp:", err)
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+ cancel()
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+ }
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+ }()
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+
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+ // graceful shutdown
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+ sig := make(chan os.Signal, 1)
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+ signal.Notify(sig, syscall.SIGINT, syscall.SIGTERM)
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+ <-sig
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+ cancel()
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+ time.Sleep(300 * time.Millisecond)
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+ return nil
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+}
go.mod
new
+101
@@ -0,0 +1,101 @@
1
+module github.com/gosuda/relaydns
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+
3
+go 1.25.0
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+
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+require (
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+ github.com/libp2p/go-libp2p v0.44.0
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+ github.com/libp2p/go-libp2p-pubsub v0.15.0
8
+ github.com/multiformats/go-multiaddr v0.16.0
9
+ github.com/spf13/cobra v1.10.1
10
+)
11
+
12
+require (
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+ github.com/benbjohnson/clock v1.3.5 // indirect
14
+ github.com/beorn7/perks v1.0.1 // indirect
15
+ github.com/cespare/xxhash/v2 v2.3.0 // indirect
16
+ github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c // indirect
17
+ github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
18
+ github.com/flynn/noise v1.1.0 // indirect
19
+ github.com/francoispqt/gojay v1.2.13 // indirect
20
+ github.com/gogo/protobuf v1.3.2 // indirect
21
+ github.com/google/uuid v1.6.0 // indirect
22
+ github.com/gorilla/websocket v1.5.3 // indirect
23
+ github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
24
+ github.com/huin/goupnp v1.3.0 // indirect
25
+ github.com/inconshreveable/mousetrap v1.1.0 // indirect
26
+ github.com/ipfs/go-cid v0.5.0 // indirect
27
+ github.com/jackpal/go-nat-pmp v1.0.2 // indirect
28
+ github.com/jbenet/go-temp-err-catcher v0.1.0 // indirect
29
+ github.com/klauspost/compress v1.18.0 // indirect
30
+ github.com/klauspost/cpuid/v2 v2.2.10 // indirect
31
+ github.com/koron/go-ssdp v0.0.6 // indirect
32
+ github.com/libp2p/go-buffer-pool v0.1.0 // indirect
33
+ github.com/libp2p/go-flow-metrics v0.2.0 // indirect
34
+ github.com/libp2p/go-libp2p-asn-util v0.4.1 // indirect
35
+ github.com/libp2p/go-msgio v0.3.0 // indirect
36
+ github.com/libp2p/go-netroute v0.3.0 // indirect
37
+ github.com/libp2p/go-reuseport v0.4.0 // indirect
38
+ github.com/libp2p/go-yamux/v5 v5.0.1 // indirect
39
+ github.com/marten-seemann/tcp v0.0.0-20210406111302-dfbc87cc63fd // indirect
40
+ github.com/miekg/dns v1.1.66 // indirect
41
+ github.com/mikioh/tcpinfo v0.0.0-20190314235526-30a79bb1804b // indirect
42
+ github.com/mikioh/tcpopt v0.0.0-20190314235656-172688c1accc // indirect
43
+ github.com/minio/sha256-simd v1.0.1 // indirect
44
+ github.com/mr-tron/base58 v1.2.0 // indirect
45
+ github.com/multiformats/go-base32 v0.1.0 // indirect
46
+ github.com/multiformats/go-base36 v0.2.0 // indirect
47
+ github.com/multiformats/go-multiaddr-dns v0.4.1 // indirect
48
+ github.com/multiformats/go-multiaddr-fmt v0.1.0 // indirect
49
+ github.com/multiformats/go-multibase v0.2.0 // indirect
50
+ github.com/multiformats/go-multicodec v0.9.1 // indirect
51
+ github.com/multiformats/go-multihash v0.2.3 // indirect
52
+ github.com/multiformats/go-multistream v0.6.1 // indirect
53
+ github.com/multiformats/go-varint v0.0.7 // indirect
54
+ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
55
+ github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
56
+ github.com/pion/datachannel v1.5.10 // indirect
57
+ github.com/pion/dtls/v2 v2.2.12 // indirect
58
+ github.com/pion/dtls/v3 v3.0.6 // indirect
59
+ github.com/pion/ice/v4 v4.0.10 // indirect
60
+ github.com/pion/interceptor v0.1.40 // indirect
61
+ github.com/pion/logging v0.2.3 // indirect
62
+ github.com/pion/mdns/v2 v2.0.7 // indirect
63
+ github.com/pion/randutil v0.1.0 // indirect
64
+ github.com/pion/rtcp v1.2.15 // indirect
65
+ github.com/pion/rtp v1.8.19 // indirect
66
+ github.com/pion/sctp v1.8.39 // indirect
67
+ github.com/pion/sdp/v3 v3.0.13 // indirect
68
+ github.com/pion/srtp/v3 v3.0.6 // indirect
69
+ github.com/pion/stun v0.6.1 // indirect
70
+ github.com/pion/stun/v3 v3.0.0 // indirect
71
+ github.com/pion/transport/v2 v2.2.10 // indirect
72
+ github.com/pion/transport/v3 v3.0.7 // indirect
73
+ github.com/pion/turn/v4 v4.0.2 // indirect
74
+ github.com/pion/webrtc/v4 v4.1.2 // indirect
75
+ github.com/prometheus/client_golang v1.22.0 // indirect
76
+ github.com/prometheus/client_model v0.6.2 // indirect
77
+ github.com/prometheus/common v0.64.0 // indirect
78
+ github.com/prometheus/procfs v0.16.1 // indirect
79
+ github.com/quic-go/qpack v0.5.1 // indirect
80
+ github.com/quic-go/quic-go v0.55.0 // indirect
81
+ github.com/quic-go/webtransport-go v0.9.0 // indirect
82
+ github.com/spaolacci/murmur3 v1.1.0 // indirect
83
+ github.com/spf13/pflag v1.0.9 // indirect
84
+ github.com/wlynxg/anet v0.0.5 // indirect
85
+ go.uber.org/dig v1.19.0 // indirect
86
+ go.uber.org/fx v1.24.0 // indirect
87
+ go.uber.org/mock v0.5.2 // indirect
88
+ go.uber.org/multierr v1.11.0 // indirect
89
+ go.uber.org/zap v1.27.0 // indirect
90
+ golang.org/x/crypto v0.41.0 // indirect
91
+ golang.org/x/exp v0.0.0-20250606033433-dcc06ee1d476 // indirect
92
+ golang.org/x/mod v0.27.0 // indirect
93
+ golang.org/x/net v0.43.0 // indirect
94
+ golang.org/x/sync v0.16.0 // indirect
95
+ golang.org/x/sys v0.35.0 // indirect
96
+ golang.org/x/text v0.28.0 // indirect
97
+ golang.org/x/time v0.12.0 // indirect
98
+ golang.org/x/tools v0.36.0 // indirect
99
+ google.golang.org/protobuf v1.36.6 // indirect
100
+ lukechampine.com/blake3 v1.4.1 // indirect
101
+)
go.sum
new
+462
@@ -0,0 +1,462 @@
1
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
2
+cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
3
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
4
+cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
5
+dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
6
+dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
7
+dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
8
+dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
9
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
10
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
11
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
12
+github.com/benbjohnson/clock v1.3.5 h1:VvXlSJBzZpA/zum6Sj74hxwYI2DIxRWuNIoXAzHZz5o=
13
+github.com/benbjohnson/clock v1.3.5/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
14
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
15
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
16
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
17
+github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
18
+github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
19
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
20
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
21
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
22
+github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
23
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
24
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
25
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
26
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27
+github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c h1:pFUpOrbxDR6AkioZ1ySsx5yxlDQZ8stG2b88gTPxgJU=
28
+github.com/davidlazar/go-crypto v0.0.0-20200604182044-b73af7476f6c/go.mod h1:6UhI8N9EjYm1c2odKpFpAYeR8dsBeM7PtzQhRgxRr9U=
29
+github.com/decred/dcrd/crypto/blake256 v1.1.0 h1:zPMNGQCm0g4QTY27fOCorQW7EryeQ/U0x++OzVrdms8=
30
+github.com/decred/dcrd/crypto/blake256 v1.1.0/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
31
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 h1:NMZiJj8QnKe1LgsbDayM4UoHwbvwDRwnI3hwNaAHRnc=
32
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33
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
34
+github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
35
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36
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37
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38
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39
+github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
40
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
41
+github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
42
+github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
43
+github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
44
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
45
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46
+github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
47
+github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
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+github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
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52
+github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
53
+github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
54
+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
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56
+github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
57
+github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
58
+github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
59
+github.com/google/pprof v0.0.0-20181206194817-3ea8567a2e57/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
60
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
61
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
62
+github.com/googleapis/gax-go v2.0.0+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk2eWhX2bMyUtNHzFKcPA9HY=
63
+github.com/googleapis/gax-go/v2 v2.0.3/go.mod h1:LLvjysVCY1JZeum8Z6l8qUty8fiNwE08qbEPm1M08qg=
64
+github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
65
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
66
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
67
+github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:FecbI9+v66THATjSRHfNgh1IVFe/9kFxbXtjV0ctIMA=
68
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462
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pkg/client.go
new
+142
@@ -0,0 +1,142 @@
1
+package pkg
2
+
3
+import (
4
+ "context"
5
+ "encoding/json"
6
+ "fmt"
7
+ "io"
8
+ "log"
9
+ "net"
10
+ "sync"
11
+ "time"
12
+
13
+ pubsub "github.com/libp2p/go-libp2p-pubsub"
14
+ "github.com/libp2p/go-libp2p/core/host"
15
+ "github.com/libp2p/go-libp2p/core/network"
16
+ "github.com/libp2p/go-libp2p/core/protocol"
17
+)
18
+
19
+type ClientConfig struct {
20
+ // libp2p stream protocol id (e.g. "/relaydns/ssh/1.0")
21
+ Protocol string
22
+ // pubsub topic for backend adverts (e.g. "relaydns.backends")
23
+ Topic string
24
+ // advertise interval
25
+ AdvertiseEvery time.Duration
26
+ // optional metadata
27
+ Name string
28
+ DNS string
29
+
30
+ // One of the following:
31
+ // 1) Provide a custom stream handler
32
+ Handler func(s network.Stream)
33
+ // 2) Or just set TargetTCP to auto-pipe bytes to a local TCP service (e.g. "127.0.0.1:22")
34
+ TargetTCP string
35
+}
36
+
37
+type RelayClient struct {
38
+ h host.Host
39
+ cfg ClientConfig
40
+ protoID protocol.ID
41
+
42
+ ps *pubsub.PubSub
43
+ t *pubsub.Topic
44
+ wg sync.WaitGroup
45
+ stop context.CancelFunc
46
+}
47
+
48
+// NewClient wires a reusable backend node that other apps can embed.
49
+// It registers a stream handler and starts an advertiser loop.
50
+// Call Close() to stop.
51
+func NewClient(ctx context.Context, h host.Host, cfg ClientConfig) (*RelayClient, error) {
52
+ if cfg.Protocol == "" {
53
+ cfg.Protocol = "/relaydns/ssh/1.0"
54
+ }
55
+ if cfg.Topic == "" {
56
+ cfg.Topic = "relaydns.backends"
57
+ }
58
+ if cfg.AdvertiseEvery <= 0 {
59
+ cfg.AdvertiseEvery = 5 * time.Second
60
+ }
61
+ b := &RelayClient{
62
+ h: h,
63
+ cfg: cfg,
64
+ protoID: protocol.ID(cfg.Protocol),
65
+ }
66
+
67
+ // 1) stream handler
68
+ switch {
69
+ case cfg.Handler != nil:
70
+ h.SetStreamHandler(b.protoID, cfg.Handler)
71
+ case cfg.TargetTCP != "":
72
+ h.SetStreamHandler(b.protoID, func(s network.Stream) {
73
+ defer s.Close()
74
+ c, err := net.Dial("tcp", cfg.TargetTCP)
75
+ if err != nil {
76
+ log.Printf("relaydns: dial %s: %v", cfg.TargetTCP, err)
77
+ return
78
+ }
79
+ defer c.Close()
80
+ // raw byte pipe
81
+ go io.Copy(c, s)
82
+ io.Copy(s, c)
83
+ })
84
+ default:
85
+ return nil, fmt.Errorf("relaydns: either Handler or TargetTCP must be set")
86
+ }
87
+
88
+ // 2) pubsub join
89
+ ps, err := pubsub.NewGossipSub(ctx, h, pubsub.WithMessageSigning(true))
90
+ if err != nil {
91
+ return nil, err
92
+ }
93
+ t, err := ps.Join(cfg.Topic)
94
+ if err != nil {
95
+ return nil, err
96
+ }
97
+ b.ps, b.t = ps, t
98
+
99
+ // 3) advertiser loop
100
+ advCtx, cancel := context.WithCancel(ctx)
101
+ b.stop = cancel
102
+ b.wg.Add(1)
103
+ go func() {
104
+ defer b.wg.Done()
105
+ ticker := time.NewTicker(cfg.AdvertiseEvery)
106
+ defer ticker.Stop()
107
+ for {
108
+ select {
109
+ case <-advCtx.Done():
110
+ return
111
+ case <-ticker.C:
112
+ addrs := b.h.Addrs()
113
+ enc := make([]string, 0, len(addrs))
114
+ for _, a := range addrs {
115
+ enc = append(enc, fmt.Sprintf("%s/p2p/%s", a.String(), b.h.ID().String()))
116
+ }
117
+ ad := Advertise{
118
+ Peer: b.h.ID().String(),
119
+ Name: b.cfg.Name,
120
+ DNS: b.cfg.DNS,
121
+ Addrs: enc,
122
+ Ready: true,
123
+ Load: 0.0,
124
+ TS: time.Now().UTC(),
125
+ }
126
+ payload, _ := json.Marshal(ad)
127
+ _ = b.t.Publish(advCtx, payload)
128
+ }
129
+ }
130
+ }()
131
+
132
+ return b, nil
133
+}
134
+
135
+func (b *RelayClient) Close() error {
136
+ if b.stop != nil {
137
+ b.stop()
138
+ }
139
+ b.wg.Wait()
140
+ // leaving topic is optional; libp2p will clean up on host close
141
+ return nil
142
+}
pkg/p2p.go
new
+308
@@ -0,0 +1,308 @@
1
+package pkg
2
+
3
+import (
4
+ "context"
5
+ "encoding/json"
6
+ "io"
7
+ "log"
8
+ "net"
9
+ "net/http"
10
+ "sync"
11
+ "sync/atomic"
12
+ "time"
13
+
14
+ "github.com/libp2p/go-libp2p"
15
+ pubsub "github.com/libp2p/go-libp2p-pubsub"
16
+ "github.com/libp2p/go-libp2p/core/host"
17
+ "github.com/libp2p/go-libp2p/core/peer"
18
+ "github.com/libp2p/go-libp2p/core/protocol"
19
+ ma "github.com/multiformats/go-multiaddr"
20
+)
21
+
22
+type Advertise struct {
23
+ Peer string `json:"peer"`
24
+ Name string `json:"name,omitempty"`
25
+ DNS string `json:"dns,omitempty"`
26
+ Addrs []string `json:"addrs"`
27
+ Ready bool `json:"ready"`
28
+ Load float64 `json:"load"`
29
+ TS time.Time `json:"ts"`
30
+}
31
+
32
+type HostEntry struct {
33
+ Info Advertise
34
+ AddrInfo *peer.AddrInfo
35
+ LastSeen time.Time
36
+}
37
+
38
+type Picker struct {
39
+ mu sync.RWMutex
40
+ rr uint64
41
+ list []HostEntry
42
+ pinTo string
43
+ pinTil time.Time
44
+}
45
+
46
+func (p *Picker) update(list []HostEntry) {
47
+ p.mu.Lock()
48
+ p.list = list
49
+ p.mu.Unlock()
50
+}
51
+func (p *Picker) choose() (HostEntry, bool) {
52
+ p.mu.RLock()
53
+ defer p.mu.RUnlock()
54
+ if len(p.list) == 0 {
55
+ return HostEntry{}, false
56
+ }
57
+ if p.pinTo != "" && time.Now().Before(p.pinTil) {
58
+ for _, e := range p.list {
59
+ if e.Info.Peer == p.pinTo {
60
+ return e, true
61
+ }
62
+ }
63
+ }
64
+ i := atomic.AddUint64(&p.rr, 1)
65
+ return p.list[i%uint64(len(p.list))], true
66
+}
67
+func (p *Picker) pin(peerID string, dur time.Duration) {
68
+ p.mu.Lock()
69
+ p.pinTo = peerID
70
+ p.pinTil = time.Now().Add(dur)
71
+ p.mu.Unlock()
72
+}
73
+func (p *Picker) unpin() {
74
+ p.mu.Lock()
75
+ p.pinTo = ""
76
+ p.pinTil = time.Time{}
77
+ p.mu.Unlock()
78
+}
79
+
80
+// ---- libp2p host boot ----
81
+
82
+func MakeHost(ctx context.Context, enableRelay bool) (host.Host, error) {
83
+ opts := []libp2p.Option{
84
+ libp2p.DefaultTransports, // TCP+QUIC
85
+ libp2p.EnableNATService(), // AutoNAT helper
86
+ libp2p.EnableHolePunching(), // DCUtR
87
+ libp2p.DefaultSecurity,
88
+ libp2p.DefaultMuxers,
89
+ libp2p.EnableAutoRelay(), // ← 추가
90
+ }
91
+ if enableRelay {
92
+ opts = append(opts, libp2p.EnableRelay()) // circuit relay (useful both as client & svc)
93
+ }
94
+ h, err := libp2p.New(opts...)
95
+ if err != nil {
96
+ return nil, err
97
+ }
98
+ return h, nil
99
+}
100
+
101
+func ConnectBootstraps(ctx context.Context, h host.Host, addrs []string) {
102
+ for _, s := range addrs {
103
+ m, err := ma.NewMultiaddr(s)
104
+ if err != nil {
105
+ log.Printf("bootstrap bad multiaddr %q: %v", s, err)
106
+ continue
107
+ }
108
+ ai, err := peer.AddrInfoFromP2pAddr(m)
109
+ if err != nil {
110
+ log.Printf("bootstrap missing /p2p/ in %q: %v", s, err)
111
+ continue
112
+ }
113
+ if err := h.Connect(ctx, *ai); err != nil {
114
+ log.Printf("bootstrap connect %s: %v", ai.ID, err)
115
+ } else {
116
+ log.Printf("connected bootstrap %s", ai.ID)
117
+ }
118
+ }
119
+}
120
+
121
+// ---- director ----
122
+
123
+type Director struct {
124
+ ctx context.Context
125
+ h host.Host
126
+ protocol string
127
+ topicName string
128
+ sub *pubsub.Subscription
129
+
130
+ storeMu sync.Mutex
131
+ store map[string]HostEntry
132
+ ttl time.Duration
133
+ pick *Picker
134
+}
135
+
136
+func NewDirector(ctx context.Context, h host.Host, protocol, topic string) (*Director, error) {
137
+ ps, err := pubsub.NewGossipSub(ctx, h)
138
+ if err != nil {
139
+ return nil, err
140
+ }
141
+ t, err := ps.Join(topic)
142
+ if err != nil {
143
+ return nil, err
144
+ }
145
+ sub, err := t.Subscribe()
146
+ if err != nil {
147
+ return nil, err
148
+ }
149
+ d := &Director{
150
+ ctx: ctx,
151
+ h: h,
152
+ protocol: protocol,
153
+ topicName: topic,
154
+ sub: sub,
155
+ store: map[string]HostEntry{},
156
+ ttl: 45 * time.Second,
157
+ pick: &Picker{},
158
+ }
159
+ go d.collect()
160
+ go d.gc()
161
+ return d, nil
162
+}
163
+
164
+func (d *Director) Close() error {
165
+ d.sub.Cancel()
166
+ return nil
167
+}
168
+
169
+func (d *Director) collect() {
170
+ for {
171
+ msg, err := d.sub.Next(d.ctx)
172
+ if err != nil {
173
+ return
174
+ }
175
+ var ad Advertise
176
+ if err := json.Unmarshal(msg.Data, &ad); err != nil {
177
+ continue
178
+ }
179
+ var ai *peer.AddrInfo
180
+ // pick any addr that includes /p2p/ (dnsaddr resolved entries will)
181
+ for _, s := range ad.Addrs {
182
+ m, err := ma.NewMultiaddr(s)
183
+ if err != nil {
184
+ continue
185
+ }
186
+ if a, err := peer.AddrInfoFromP2pAddr(m); err == nil {
187
+ ai = a
188
+ break
189
+ }
190
+ }
191
+ if ai == nil {
192
+ continue
193
+ }
194
+ d.storeMu.Lock()
195
+ d.store[ad.Peer] = HostEntry{Info: ad, AddrInfo: ai, LastSeen: time.Now()}
196
+ // refresh picker snapshot
197
+ snap := make([]HostEntry, 0, len(d.store))
198
+ for _, v := range d.store {
199
+ snap = append(snap, v)
200
+ }
201
+ d.storeMu.Unlock()
202
+ d.pick.update(snap)
203
+ }
204
+}
205
+
206
+func (d *Director) gc() {
207
+ t := time.NewTicker(5 * time.Second)
208
+ defer t.Stop()
209
+ for {
210
+ select {
211
+ case <-d.ctx.Done():
212
+ return
213
+ case <-t.C:
214
+ now := time.Now()
215
+ d.storeMu.Lock()
216
+ for k, v := range d.store {
217
+ if now.Sub(v.LastSeen) > d.ttl {
218
+ delete(d.store, k)
219
+ }
220
+ }
221
+ snap := make([]HostEntry, 0, len(d.store))
222
+ for _, v := range d.store {
223
+ snap = append(snap, v)
224
+ }
225
+ d.storeMu.Unlock()
226
+ d.pick.update(snap)
227
+ }
228
+ }
229
+}
230
+
231
+func (d *Director) ServeTCP(addr string) error {
232
+ ln, err := net.Listen("tcp", addr)
233
+ if err != nil {
234
+ return err
235
+ }
236
+ log.Printf("director TCP listening on %s (protocol %s)", addr, d.protocol)
237
+ for {
238
+ c, err := ln.Accept()
239
+ if err != nil {
240
+ continue
241
+ }
242
+ go d.handleConn(c)
243
+ }
244
+}
245
+
246
+func (d *Director) handleConn(c net.Conn) {
247
+ defer c.Close()
248
+ entry, ok := d.pick.choose()
249
+ if !ok {
250
+ log.Println("no backend peers available")
251
+ return
252
+ }
253
+ // ensure we're connected (AddrInfo contains addrs)
254
+ if err := d.h.Connect(d.ctx, *entry.AddrInfo); err != nil {
255
+ log.Printf("connect %s failed: %v", entry.AddrInfo.ID, err)
256
+ return
257
+ }
258
+ s, err := d.h.NewStream(d.ctx, entry.AddrInfo.ID, protocolID(d.protocol))
259
+ if err != nil {
260
+ log.Printf("new stream: %v", err)
261
+ return
262
+ }
263
+ defer s.Close()
264
+ // raw byte tunnel
265
+ go io.Copy(s, c)
266
+ io.Copy(c, s)
267
+}
268
+
269
+func (d *Director) ServeHTTP(addr string) error {
270
+ mux := http.NewServeMux()
271
+ mux.HandleFunc("/hosts", func(w http.ResponseWriter, r *http.Request) {
272
+ d.storeMu.Lock()
273
+ defer d.storeMu.Unlock()
274
+ list := make([]HostEntry, 0, len(d.store))
275
+ for _, v := range d.store {
276
+ list = append(list, v)
277
+ }
278
+ _ = json.NewEncoder(w).Encode(list)
279
+ })
280
+ mux.HandleFunc("/override", func(w http.ResponseWriter, r *http.Request) {
281
+ switch r.Method {
282
+ case "POST":
283
+ peerID := r.URL.Query().Get("peer")
284
+ dur := 30 * time.Second
285
+ if s := r.URL.Query().Get("ttl"); s != "" {
286
+ if v, err := time.ParseDuration(s); err == nil {
287
+ dur = v
288
+ }
289
+ }
290
+ d.pick.pin(peerID, dur)
291
+ w.WriteHeader(204)
292
+ case "DELETE":
293
+ d.pick.unpin()
294
+ w.WriteHeader(204)
295
+ default:
296
+ w.WriteHeader(405)
297
+ }
298
+ })
299
+ mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
300
+ _, _ = w.Write([]byte("ok"))
301
+ })
302
+ log.Printf("director HTTP API on %s", addr)
303
+ return http.ListenAndServe(addr, mux)
304
+}
305
+
306
+func protocolID(s string) protocol.ID {
307
+ return protocol.ID(s)
308
+}