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net: add ListenConfig, Dialer.Control to permit socket opts before listen/dial

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Existing implementation does not provide a way to set options such as
SO_REUSEPORT, that has to be set prior the socket being bound.

New exposed API:
pkg net, method (*ListenConfig) Listen(context.Context, string, string) (Listener, error)
pkg net, method (*ListenConfig) ListenPacket(context.Context, string, string) (PacketConn, error)
pkg net, type ListenConfig struct
pkg net, type ListenConfig struct, Control func(string, string, syscall.RawConn) error
pkg net, type Dialer struct, Control func(string, string, syscall.RawConn) error

Fixes #9661

Change-Id: If4d275711f823df72d3ac5cc3858651a6a57cccb
Reviewed-on: https://go-review.googlesource.com/72810
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Audrius Butkevicius 2018-05-28 02:47:21 +01:00 • committed by Ian Lance Taylor
parent cc6e568c81
commit 3c4d3bdd3b
12 changed files with 350 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

38
src/net/rawconn_unix_test.go
View file

@ -6,7 +6,10 @@
package net
import "syscall"
import (
"errors"
"syscall"
)
func readRawConn(c syscall.RawConn, b []byte) (int, error) {
var operr error
@ -89,3 +92,36 @@ func controlRawConn(c syscall.RawConn, addr Addr) error {
}
return nil
}
func controlOnConnSetup(network string, address string, c syscall.RawConn) error {
var operr error
var fn func(uintptr)
switch network {
case "tcp", "udp", "ip":
return errors.New("ambiguous network: " + network)
case "unix", "unixpacket", "unixgram":
fn = func(s uintptr) {
_, operr = syscall.GetsockoptInt(int(s), syscall.SOL_SOCKET, syscall.SO_ERROR)
}
default:
switch network[len(network)-1] {
case '4':
fn = func(s uintptr) {
operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IP, syscall.IP_TTL, 1)
}
case '6':
fn = func(s uintptr) {
operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IPV6, syscall.IPV6_UNICAST_HOPS, 1)
}
default:
return errors.New("unknown network: " + network)
}
}
if err := c.Control(fn); err != nil {
return err
}
if operr != nil {
return operr
}
return nil
}