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allow non localhost backend server #1

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2e3510a
feat: support remote backend server
cadl Oct 16, 2023
7cc2cfa
chore: dockerize
cadl Oct 16, 2023
bfe96e1
doc: update readme
cadl Oct 16, 2023
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15 changes: 15 additions & 0 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
FROM golang:1.20 as builder
WORKDIR /app
COPY . .

RUN CGO_ENABLED=0 go build ./proxy.go

FROM alpine:latest

COPY --from=builder /app/proxy /app/proxy

ENV BACKEND_PORT=3306
ENV BACKEND_HOST=localhost
ENV PROXY_PORT=3307

CMD ["sh", "-c", "/app/proxy ${PROXY_PORT} ${BACKEND_HOST} ${BACKEND_PORT} /etc/server-cert.pem /etc/server-key.pem"]
2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -4,7 +4,7 @@ MySQL proxy that terminates TLS before proxying connection to MySQL server (with

```bash
$ go build proxy.go
$ ./proxy 3306 3307 ./server.crt ./server.key
$ ./proxy 3306 127.0.0.1 3307 ./server.crt ./server.key
```

## Protocol
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13 changes: 7 additions & 6 deletions proxy.go
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Expand Up @@ -18,14 +18,15 @@ func main() {
}

func main2() error {
if len(os.Args) != 5 {
return fmt.Errorf("Expected 4 args: usage: proxy <proxy-port> <server-port> <server-cert-path> <server-key-path>")
if len(os.Args) != 6 {
return fmt.Errorf("Expected 5 args: usage: proxy <proxy-port> <server-addr> <server-port> <server-cert-path> <server-key-path>")
}

port := os.Args[1]
targetPort := os.Args[2]
serverCertPath := os.Args[3]
serverKeyPath := os.Args[4]
targetAddr := os.Args[2]
targetPort := os.Args[3]
serverCertPath := os.Args[4]
serverKeyPath := os.Args[5]

serverCert, err := tls.LoadX509KeyPair(serverCertPath, serverKeyPath)
if err != nil {
Expand All @@ -37,7 +38,7 @@ func main2() error {

proxy := MysqlProxy{
listenAddr: fmt.Sprintf("0.0.0.0:%s", port),
serverAddr: fmt.Sprintf("localhost:%s", targetPort),
serverAddr: fmt.Sprintf("%s:%s", targetAddr, targetPort),
tlsConfig: tlsConfig,
debug: false,
}
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