support QUIC protocol

Author: lonnywong

.goreleaser.yaml

@@ -17,6 +17,7 @@ builds:
       - amd64
       - arm
       - arm64
+      - loong64
     goarm:
       - "6"
       - "7"

README.md

@@ -4,7 +4,7 @@ The [`tssh --udp`](https://github.com/trzsz/trzsz-ssh) works like [`mosh`](https
 
 ## Advanced Features
 
-- Low latency ( based on kcp )
+- Low latency ( based on QUIC / KCP )
 
 - Port forwarding ( same as ssh )
 

go.mod

@@ -5,20 +5,29 @@ go 1.20
 require (
 	github.com/UserExistsError/conpty v0.1.3
 	github.com/creack/pty v1.1.21
+	github.com/quic-go/quic-go v0.40.1
 	github.com/trzsz/go-arg v1.5.3
 	github.com/xtaci/kcp-go/v5 v5.6.1
+	github.com/xtaci/smux v1.5.24
 	golang.org/x/crypto v0.24.0
 	golang.org/x/sys v0.21.0
 )
 
 require (
 	github.com/alexflint/go-scalar v1.2.0 // indirect
+	github.com/go-task/slim-sprig/v3 v3.0.0 // indirect
+	github.com/google/pprof v0.0.0-20240625030939-27f56978b8b0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
 	github.com/klauspost/reedsolomon v1.12.1 // indirect
+	github.com/onsi/ginkgo/v2 v2.19.0 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/stretchr/testify v1.8.4 // indirect
-	github.com/templexxx/cpu v0.1.0 // indirect
+	github.com/quic-go/qtls-go1-20 v0.4.1 // indirect
+	github.com/templexxx/cpu v0.1.1-0.20240303154708-598a14b050c5 // indirect
 	github.com/templexxx/xorsimd v0.4.2 // indirect
 	github.com/tjfoc/gmsm v1.4.1 // indirect
+	go.uber.org/mock v0.4.0 // indirect
+	golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8 // indirect
+	golang.org/x/mod v0.18.0 // indirect
 	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/tools v0.22.0 // indirect
 )

go.sum

@@ -15,6 +15,9 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
+github.com/go-task/slim-sprig/v3 v3.0.0 h1:sUs3vkvUymDpBKi3qH1YSqBQk9+9D/8M2mN1vB6EwHI=
+github.com/go-task/slim-sprig/v3 v3.0.0/go.mod h1:W848ghGpv3Qj3dhTPRyJypKRiqCdHZiAzKg9hl15HA8=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -30,6 +33,9 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/pprof v0.0.0-20240625030939-27f56978b8b0 h1:e+8XbKB6IMn8A4OAyZccO4pYfB3s7bt6azNIPE7AnPg=
+github.com/google/pprof v0.0.0-20240625030939-27f56978b8b0/go.mod h1:K1liHPHnj73Fdn/EKuT8nrFqBihUSKXoLYU0BuatOYo=
 github.com/klauspost/cpuid v1.2.4/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
 github.com/klauspost/cpuid v1.3.1/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
 github.com/klauspost/cpuid/v2 v2.2.8 h1:+StwCXwm9PdpiEkPyzBXIy+M9KUb4ODm0Zarf1kS5BM=
@@ -38,20 +44,27 @@ github.com/klauspost/reedsolomon v1.9.9/go.mod h1:O7yFFHiQwDR6b2t63KPUpccPtNdp5A
 github.com/klauspost/reedsolomon v1.12.1 h1:NhWgum1efX1x58daOBGCFWcxtEhOhXKKl1HAPQUp03Q=
 github.com/klauspost/reedsolomon v1.12.1/go.mod h1:nEi5Kjb6QqtbofI6s+cbG/j1da11c96IBYBSnVGtuBs=
 github.com/mmcloughlin/avo v0.0.0-20200803215136-443f81d77104/go.mod h1:wqKykBG2QzQDJEzvRkcS8x6MiSJkF52hXZsXcjaB3ls=
+github.com/onsi/ginkgo/v2 v2.19.0 h1:9Cnnf7UHo57Hy3k6/m5k3dRfGTMXGvxhHFvkDTCTpvA=
+github.com/onsi/ginkgo/v2 v2.19.0/go.mod h1:rlwLi9PilAFJ8jCg9UE1QP6VBpd6/xj3SRC0d6TU0To=
+github.com/onsi/gomega v1.33.1 h1:dsYjIxxSR755MDmKVsaFQTE22ChNBcuuTWgkUDSubOk=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/quic-go/qtls-go1-20 v0.4.1 h1:D33340mCNDAIKBqXuAvexTNMUByrYmFYVfKfDN5nfFs=
+github.com/quic-go/qtls-go1-20 v0.4.1/go.mod h1:X9Nh97ZL80Z+bX/gUXMbipO6OxdiDi58b/fMC9mAL+k=
+github.com/quic-go/quic-go v0.40.1 h1:X3AGzUNFs0jVuO3esAGnTfvdgvL4fq655WaOi1snv1Q=
+github.com/quic-go/quic-go v0.40.1/go.mod h1:PeN7kuVJ4xZbxSv/4OX6S1USOX8MJvydwpTx31vx60c=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
 github.com/templexxx/cpu v0.0.1/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
 github.com/templexxx/cpu v0.0.7/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
-github.com/templexxx/cpu v0.1.0 h1:wVM+WIJP2nYaxVxqgHPD4wGA2aJ9rvrQRV8CvFzNb40=
 github.com/templexxx/cpu v0.1.0/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
+github.com/templexxx/cpu v0.1.1-0.20240303154708-598a14b050c5 h1:Ke6p9WHBy8Ooz8Vg/+o9SHp5yE2VlzzyHVEfHTFmJoM=
+github.com/templexxx/cpu v0.1.1-0.20240303154708-598a14b050c5/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
 github.com/templexxx/xorsimd v0.4.1/go.mod h1:W+ffZz8jJMH2SXwuKu9WhygqBMbFnp14G2fqEr8qaNo=
 github.com/templexxx/xorsimd v0.4.2 h1:ocZZ+Nvu65LGHmCLZ7OoCtg8Fx8jnHKK37SjvngUoVI=
 github.com/templexxx/xorsimd v0.4.2/go.mod h1:HgwaPoDREdi6OnULpSfxhzaiiSUY4Fi3JPn1wpt28NI=
@@ -64,8 +77,12 @@ github.com/xtaci/kcp-go/v5 v5.6.1 h1:Pwn0aoeNSPF9dTS7IgiPXn0HEtaIlVb6y5UKWPsx8bI
 github.com/xtaci/kcp-go/v5 v5.6.1/go.mod h1:W3kVPyNYwZ06p79dNwFWQOVFrdcBpDBsdyvK8moQrYo=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae/go.mod h1:gXtu8J62kEgmN++bm9BVICuT/e8yiLI2KFobd/TRFsE=
+github.com/xtaci/smux v1.5.24 h1:77emW9dtnOxxOQ5ltR+8BbsX1kzcOxQ5gB+aaV9hXOY=
+github.com/xtaci/smux v1.5.24/go.mod h1:OMlQbT5vcgl2gb49mFkYo6SMf+zP3rcjcwQz7ZU7IGY=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+go.uber.org/mock v0.4.0 h1:VcM4ZOtdbR4f6VXfiOpwpVJDL6lCReaZ6mw31wqh7KU=
+go.uber.org/mock v0.4.0/go.mod h1:a6FSlNadKUHUa9IP5Vyt1zh4fC7uAwxMutEAscFbkZc=
 golang.org/x/arch v0.0.0-20190909030613-46d78d1859ac/go.mod h1:flIaEI6LNU6xOCD5PaJvn9wGP0agmIOqjrtsKGRguv4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -76,11 +93,15 @@ golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPh
 golang.org/x/crypto v0.24.0 h1:mnl8DM0o513X8fdIkmyFE/5hTYxbwYOjDS/+rK6qpRI=
 golang.org/x/crypto v0.24.0/go.mod h1:Z1PMYSOR5nyMcyAVAIQSKCDwalqy85Aqn1x3Ws4L5DM=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
+golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8 h1:yixxcjnhBmY0nkL253HFVIm0JsFHwrHdT3Yh6szTnfY=
+golang.org/x/exp v0.0.0-20240613232115-7f521ea00fb8/go.mod h1:jj3sYF3dwk5D+ghuXyeI3r5MFf+NT2An6/9dOA95KSI=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.18.0 h1:5+9lSbEzPSdWkH32vYPBwEpX8KwDbM52Ud9xBUvNlb0=
+golang.org/x/mod v0.18.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -99,6 +120,7 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -111,6 +133,7 @@ golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
 golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
@@ -119,6 +142,8 @@ golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBn
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200808161706-5bf02b21f123/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
+golang.org/x/tools v0.22.0 h1:gqSGLZqv+AI9lIQzniJ0nZDRG5GBPsSi+DRNHWNz6yA=
+golang.org/x/tools v0.22.0/go.mod h1:aCwcsjqvq7Yqt6TNyX7QMU2enbQ/Gt0bo6krSeEri+c=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -137,6 +162,7 @@ google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQ
 google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
 google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

tsshd/bus.go

@@ -26,63 +26,64 @@ package tsshd
 
 import (
 	"fmt"
+	"net"
 	"sync"
 	"sync/atomic"
 	"time"
-
-	"github.com/xtaci/kcp-go/v5"
 )
 
+var serving atomic.Bool
+
 var busMutex sync.Mutex
 
-var busSession atomic.Pointer[kcp.UDPSession]
+var busStream atomic.Pointer[net.Conn]
 
 var lastAliveTime atomic.Pointer[time.Time]
 
 func sendBusCommand(command string) error {
 	busMutex.Lock()
 	defer busMutex.Unlock()
-	session := busSession.Load()
-	if session == nil {
-		return fmt.Errorf("bus session is nil")
+	stream := busStream.Load()
+	if stream == nil {
+		return fmt.Errorf("bus stream is nil")
 	}
-	return SendCommand(session, command)
+	return SendCommand(*stream, command)
 }
 
 func sendBusMessage(command string, msg any) error {
 	busMutex.Lock()
 	defer busMutex.Unlock()
-	session := busSession.Load()
-	if session == nil {
-		return fmt.Errorf("bus session is nil")
+	stream := busStream.Load()
+	if stream == nil {
+		return fmt.Errorf("bus stream is nil")
 	}
-	if err := SendCommand(session, command); err != nil {
+	if err := SendCommand(*stream, command); err != nil {
 		return err
 	}
-	return SendMessage(session, msg)
+	return SendMessage(*stream, msg)
 }
 
 func trySendErrorMessage(format string, a ...any) {
 	_ = sendBusMessage("error", ErrorMessage{fmt.Sprintf(format, a...)})
 }
 
-func handleBusEvent(session *kcp.UDPSession) {
+func handleBusEvent(stream net.Conn) {
 	var msg BusMessage
-	if err := RecvMessage(session, &msg); err != nil {
-		SendError(session, fmt.Errorf("recv bus message failed: %v", err))
+	if err := RecvMessage(stream, &msg); err != nil {
+		SendError(stream, fmt.Errorf("recv bus message failed: %v", err))
 		return
 	}
 
 	busMutex.Lock()
 
 	// only one bus
-	if !busSession.CompareAndSwap(nil, session) {
+	if !busStream.CompareAndSwap(nil, &stream) {
 		busMutex.Unlock()
-		SendError(session, fmt.Errorf("bus has been initialized"))
+		SendError(stream, fmt.Errorf("bus has been initialized"))
 		return
 	}
 
-	if err := SendSuccess(session); err != nil { // ack ok
+	if err := SendSuccess(stream); err != nil { // ack ok
 		busMutex.Unlock()
 		trySendErrorMessage("bus ack ok failed: %v", err)
 		return
@@ -99,46 +100,55 @@ func handleBusEvent(session *kcp.UDPSession) {
 	}
 
 	for {
-		command, err := RecvCommand(session)
+		command, err := RecvCommand(stream)
 		if err != nil {
 			trySendErrorMessage("recv bus command failed: %v", err)
 			return
 		}
 
 		switch command {
 		case "resize":
-			err = handleResizeEvent(session)
+			err = handleResizeEvent(stream)
 		case "close":
-			exitChan <- true
+			exitChan <- 0
 			return
 		case "alive":
 			now := time.Now()
 			lastAliveTime.Store(&now)
 		default:
-			err = handleUnknownEvent(session)
+			err = handleUnknownEvent(stream)
 		}
 		if err != nil {
 			trySendErrorMessage("handle bus command [%s] failed: %v", command, err)
 		}
 	}
 }
 
-func handleUnknownEvent(session *kcp.UDPSession) error {
+func handleUnknownEvent(stream net.Conn) error {
 	var msg struct{}
-	if err := RecvMessage(session, &msg); err != nil {
+	if err := RecvMessage(stream, &msg); err != nil {
 		return fmt.Errorf("recv unknown message failed: %v", err)
 	}
 	return fmt.Errorf("unknown command")
 }
 
 func keepAlive(timeout time.Duration) {
+	sleepTime := timeout / 10
+	if sleepTime > 10*time.Second {
+		sleepTime = 10 * time.Second
+	}
+	go func() {
+		for {
+			_ = sendBusCommand("alive")
+			time.Sleep(sleepTime)
+		}
+	}()
 	for {
-		_ = sendBusCommand("alive")
 		if t := lastAliveTime.Load(); t != nil && time.Since(*t) > timeout {
 			trySendErrorMessage("tsshd keep alive timeout")
-			exitChan <- true
+			exitChan <- 2
 			return
 		}
-		time.Sleep(timeout / 10)
+		time.Sleep(sleepTime)
 	}
 }