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net: remove dependency on math/rand

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Like we did for sync, let the runtime give net random numbers,
to avoid forcing an import of math/rand for DNS.

Change-Id: Iab3e64121d687d288a3961a8ccbcebe589047253
Reviewed-on: https://go-review.googlesource.com/c/go/+/241258
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Russ Cox 2020-07-07 09:07:16 -04:00
parent 349a287646
commit 39b5276914
5 changed files with 23 additions and 12 deletions
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3
src/net/dnsclient_unix.go
View file

@ -18,7 +18,6 @@ import (
"context"
"errors"
"io"
"math/rand"
"os"
"sync"
"time"
@ -47,7 +46,7 @@ var (
)
func newRequest(q dnsmessage.Question) (id uint16, udpReq, tcpReq []byte, err error) {
id = uint16(rand.Int()) ^ uint16(time.Now().UnixNano())
id = uint16(randInt())
b := dnsmessage.NewBuilder(make([]byte, 2, 514), dnsmessage.Header{ID: id, RecursionDesired: true})
b.EnableCompression()
if err := b.StartQuestions(); err != nil {