forked from juju/utils
/
http-1_7.go
35 lines (30 loc) · 904 Bytes
/
http-1_7.go
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// Copyright 2016 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
//+build go1.7
package utils
import (
"context"
"fmt"
"net"
"net/http"
"time"
)
var ctxtDialer = &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}
// installHTTPDialShim patches the default HTTP transport so
// that it fails when an attempt is made to dial a non-local
// host.
//
// Note that this is Go version dependent because in Go 1.7 and above,
// the DialContext field was introduced (and set in http.DefaultTransport)
// which overrides the Dial field.
func installHTTPDialShim(t *http.Transport) {
t.DialContext = func(ctxt context.Context, network, addr string) (net.Conn, error) {
if !OutgoingAccessAllowed && !isLocalAddr(addr) {
return nil, fmt.Errorf("access to address %q not allowed", addr)
}
return ctxtDialer.DialContext(ctxt, network, addr)
}
}