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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1 @@ | ||
| 1.14.0 | ||
| 1.16.4 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright 2018 SumUp Ltd. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package cmd | ||
|
|
||
| import ( | ||
| "context" | ||
| "os" | ||
| "os/signal" | ||
| "syscall" | ||
| "time" | ||
|
|
||
| "github.com/palantir/stacktrace" | ||
| "github.com/spf13/cobra" | ||
| "github.com/sumup-oss/go-pkgs/logger" | ||
|
|
||
| "github.com/sumup-oss/gocat/internal/relay" | ||
| ) | ||
|
|
||
| func NewTCPToTCPcmd(logger logger.Logger) *cobra.Command { | ||
| var tcpSourceAddress string | ||
| var tcpDestinationAddress string | ||
| var bufferSize int | ||
| var tcpToUnixHealthCheckInterval time.Duration | ||
|
|
||
| cmdInstance := &cobra.Command{ | ||
| Use: "tcp-to-tcp", | ||
| Short: "relay from a TCP source to TCP destination", | ||
| Long: `relay from a TCP source to TCP destination`, | ||
| RunE: func(command *cobra.Command, args []string) error { | ||
| // nolint: gocritic | ||
| if len(tcpSourceAddress) < 0 { | ||
| return stacktrace.NewError("blank/empty `src` specified") | ||
| } | ||
|
|
||
| // nolint: gocritic | ||
| if len(tcpDestinationAddress) < 0 { | ||
| return stacktrace.NewError("blank/empty `dst` specified") | ||
| } | ||
|
|
||
| relayer, err := relay.NewTCPtoTCPsocket( | ||
| logger, | ||
| tcpToUnixHealthCheckInterval, | ||
| tcpSourceAddress, | ||
| tcpDestinationAddress, | ||
| bufferSize, | ||
| ) | ||
| if err != nil { | ||
| return stacktrace.Propagate(err, "couldn't create relay from TCP to TCP") | ||
| } | ||
|
|
||
| osSignalCh := make(chan os.Signal, 1) | ||
| defer close(osSignalCh) | ||
|
|
||
| signal.Notify(osSignalCh, os.Interrupt, syscall.SIGTERM) | ||
|
|
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| ctx, cancelFunc := context.WithCancel(context.Background()) | ||
| defer cancelFunc() | ||
|
|
||
| // Ctrl+C handler | ||
| go func() { | ||
| <-osSignalCh | ||
| signal.Stop(osSignalCh) | ||
|
|
||
| _ = os.RemoveAll(tcpSourceAddress) | ||
| cancelFunc() | ||
| }() | ||
|
|
||
| err = relayer.Relay(ctx) | ||
| if err != nil { | ||
| _ = os.RemoveAll(tcpSourceAddress) | ||
| return stacktrace.Propagate(err, "couldn't relay from TCP to TCP") | ||
| } | ||
|
|
||
| _ = os.RemoveAll(tcpSourceAddress) | ||
| return nil | ||
| }, | ||
| } | ||
|
|
||
| cmdInstance.Flags().DurationVar( | ||
| &tcpToUnixHealthCheckInterval, | ||
| "health-check-interval", | ||
| 30*time.Second, | ||
| "health check interval for `src`, e.g values are 30m, 60s, 1h.", | ||
| ) | ||
|
|
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| cmdInstance.Flags().StringVar(&tcpSourceAddress, "src", "", "source of TCP address") | ||
| _ = cmdInstance.MarkFlagRequired("src") | ||
|
|
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| cmdInstance.Flags().StringVar(&tcpDestinationAddress, "dst", "", "destination of TCP address") | ||
| _ = cmdInstance.MarkFlagRequired("dst") | ||
|
|
||
| cmdInstance.Flags().IntVar( | ||
| &bufferSize, | ||
| "buffer-size", | ||
| DefaultBufferSize, | ||
| "Buffer size in bytes of the data stream", | ||
| ) | ||
| return cmdInstance | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| // Copyright 2018 SumUp Ltd. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package relay | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/palantir/stacktrace" | ||
| "github.com/sumup-oss/go-pkgs/logger" | ||
| ) | ||
|
|
||
| type TCPtoTCPsocket struct { | ||
| AbstractDuplexRelay | ||
| } | ||
|
|
||
| func NewTCPtoTCPsocket( | ||
| logger logger.Logger, | ||
| healthCheckInterval time.Duration, | ||
| srcAddress, | ||
| dstAddress string, | ||
| bufferSize int, | ||
| ) (*TCPtoTCPsocket, error) { | ||
| tcpAddressParts := strings.Split(srcAddress, ":") | ||
| if len(tcpAddressParts) != 2 { | ||
| return nil, stacktrace.NewError( | ||
| "wrong format for tcp address %s. Expected <addr>:<port>", | ||
| srcAddress, | ||
| ) | ||
| } | ||
|
|
||
| _, err := strconv.ParseInt(tcpAddressParts[1], 10, 32) | ||
| if err != nil { | ||
| return nil, stacktrace.Propagate( | ||
| err, | ||
| "could not parse specified port number %s", | ||
| tcpAddressParts[1], | ||
| ) | ||
| } | ||
|
|
||
| return &TCPtoTCPsocket{ | ||
| AbstractDuplexRelay{ | ||
| healthCheckInterval: healthCheckInterval, | ||
| logger: logger, | ||
| sourceName: "source TCP connection", | ||
| destinationName: "destination TCP connection", | ||
| destinationAddr: dstAddress, | ||
| bufferSize: bufferSize, | ||
| dialSourceConn: func(ctx context.Context) (net.Conn, error) { | ||
| dialer := &net.Dialer{ | ||
| KeepAlive: tcpKeepAlivePeriod, | ||
| } | ||
| conn, err := dialer.DialContext( | ||
| ctx, | ||
| "tcp", | ||
| srcAddress, | ||
| ) | ||
| if err != nil { | ||
| return nil, stacktrace.Propagate( | ||
| err, | ||
| "failed to dial TCP address: %s", | ||
| srcAddress, | ||
| ) | ||
| } | ||
|
|
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| tcpConn := conn.(*net.TCPConn) | ||
| // TODO: Re-evaluate if this is redundant when `KeepAlive` and `net.Dialer` is used. | ||
| _ = tcpConn.SetKeepAlive(true) | ||
| _ = tcpConn.SetKeepAlivePeriod(tcpKeepAlivePeriod) | ||
| return tcpConn, nil | ||
| }, | ||
| listenTargetConn: func(ctx context.Context) (net.Listener, error) { | ||
| var lc net.ListenConfig | ||
| listener, err := lc.Listen(ctx, "tcp", dstAddress) | ||
| if err != nil { | ||
| return nil, stacktrace.Propagate( | ||
| err, | ||
| "failed to listen at destination TCP address: %s", | ||
| dstAddress, | ||
| ) | ||
| } | ||
| return listener, nil | ||
| }, | ||
| }, | ||
| }, nil | ||
| } |