Can't make https request in plugin: bad record MAC

[ianlewis]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

$ go version
go version go1.8rc3 linux/amd64

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/ianlewis/go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build234282751=/tmp/go-build -gno-record-gcc-switches"
CXX="g++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What did you do?

I attempted to make an https request to a webserver from plugin code.

main.go

package main

import (
	"flag"
	"log"
	"plugin"
)

var (
	pluginPath = flag.String("plugin", "plugin.so", "Path to the plugin.so")
)

func main() {
	flag.Parse()

	p, err := plugin.Open(*pluginPath)
	if err != nil {
		log.Fatalf("Could not open plugin: %v", err)
	}

	w, err := p.Lookup("MakeRequest")
	if err != nil {
		log.Fatalf("Could not open plugin: %v", err)
	}
	MakeRequest, ok := w.(func() ([]byte, error))
	if !ok {
		log.Fatalf("Could not open plugin")
	}

	body, err := MakeRequest()
	if err != nil {
		log.Fatalf("failed request: %v", err)
	}
	log.Printf(string(body))
}

plugin.go

package main

import (
	"io/ioutil"
	"net/http"
)

func MakeRequest() ([]byte, error) {
	resp, err := http.Get("https://www.google.com/")
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	return body, nil
}

What did you expect to see?

I expected that the request would work properly.

What did you see instead?

A bad record MAC is returned.

2017/02/15 08:22:22 failed request: Get https://www.google.com/: remote error: tls: bad record MAC

[crawshaw]

This is #18820, which is fixed at tip and in the 1.8 release branch.