jochen
be92762969
The live tests reached one shared bus and assert, read and remove the mesh's own objects by their fixed names, so packages run in parallel deleted what each other read and the suite passed only one package at a time; a red suite read as noise. internal/testbus starts a server per test, linked in at the nats-server release go.mod pins, and a test holds that pin to the catalogue's bus image and to the facts snapshot's bus when there is one, so the tests never run a bus the mesh does not. The waiter test read a timing (the most connections held at one look) and now reads the state it means (the fewest held across the wait). make check runs the packages in parallel under the race detector, with a timeout.
146 lines
4.4 KiB
Go
146 lines
4.4 KiB
Go
// Copyright 2021 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux
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package unix
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import (
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"unsafe"
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)
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// Helpers for dealing with ifreq since it contains a union and thus requires a
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// lot of unsafe.Pointer casts to use properly.
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// An Ifreq is a type-safe wrapper around the raw ifreq struct. An Ifreq
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// contains an interface name and a union of arbitrary data which can be
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// accessed using the Ifreq's methods. To create an Ifreq, use the NewIfreq
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// function.
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//
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// Use the Name method to access the stored interface name. The union data
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// fields can be get and set using the following methods:
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// - Uint16/SetUint16: flags
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// - Uint32/SetUint32: ifindex, metric, mtu
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type Ifreq struct {
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// Aligns the union for the accessors below, which cast it in place;
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// the generated ifreq is all byte arrays, so its alignment is one.
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_ [0]int64
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raw ifreq
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}
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// NewIfreq creates an Ifreq with the input network interface name after
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// validating the name does not exceed IFNAMSIZ-1 (trailing NULL required)
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// bytes.
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func NewIfreq(name string) (*Ifreq, error) {
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// Leave room for terminating NULL byte.
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if len(name) >= IFNAMSIZ {
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return nil, EINVAL
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}
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var ifr ifreq
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copy(ifr.Ifrn[:], name)
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return &Ifreq{raw: ifr}, nil
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}
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// TODO(mdlayher): get/set methods for hardware address sockaddr, char array, etc.
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// Name returns the interface name associated with the Ifreq.
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func (ifr *Ifreq) Name() string {
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return ByteSliceToString(ifr.raw.Ifrn[:])
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}
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// According to netdevice(7), only AF_INET addresses are returned for numerous
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// sockaddr ioctls. For convenience, we expose these as Inet4Addr since the Port
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// field and other data is always empty.
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// Inet4Addr returns the Ifreq union data from an embedded sockaddr as a C
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// in_addr/Go []byte (4-byte IPv4 address) value. If the sockaddr family is not
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// AF_INET, an error is returned.
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func (ifr *Ifreq) Inet4Addr() ([]byte, error) {
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raw := *(*RawSockaddrInet4)(unsafe.Pointer(&ifr.raw.Ifru[:SizeofSockaddrInet4][0]))
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if raw.Family != AF_INET {
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// Cannot safely interpret raw.Addr bytes as an IPv4 address.
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return nil, EINVAL
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}
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return raw.Addr[:], nil
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}
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// SetInet4Addr sets a C in_addr/Go []byte (4-byte IPv4 address) value in an
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// embedded sockaddr within the Ifreq's union data. v must be 4 bytes in length
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// or an error will be returned.
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func (ifr *Ifreq) SetInet4Addr(v []byte) error {
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if len(v) != 4 {
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return EINVAL
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}
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var addr [4]byte
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copy(addr[:], v)
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ifr.clear()
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*(*RawSockaddrInet4)(
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unsafe.Pointer(&ifr.raw.Ifru[:SizeofSockaddrInet4][0]),
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) = RawSockaddrInet4{
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// Always set IP family as ioctls would require it anyway.
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Family: AF_INET,
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Addr: addr,
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}
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return nil
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}
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// Uint16 returns the Ifreq union data as a C short/Go uint16 value.
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func (ifr *Ifreq) Uint16() uint16 {
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return *(*uint16)(unsafe.Pointer(&ifr.raw.Ifru[:2][0]))
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}
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// SetUint16 sets a C short/Go uint16 value as the Ifreq's union data.
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func (ifr *Ifreq) SetUint16(v uint16) {
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ifr.clear()
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*(*uint16)(unsafe.Pointer(&ifr.raw.Ifru[:2][0])) = v
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}
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// Uint32 returns the Ifreq union data as a C int/Go uint32 value.
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func (ifr *Ifreq) Uint32() uint32 {
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return *(*uint32)(unsafe.Pointer(&ifr.raw.Ifru[:4][0]))
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}
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// SetUint32 sets a C int/Go uint32 value as the Ifreq's union data.
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func (ifr *Ifreq) SetUint32(v uint32) {
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ifr.clear()
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*(*uint32)(unsafe.Pointer(&ifr.raw.Ifru[:4][0])) = v
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}
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// clear zeroes the ifreq's union field to prevent trailing garbage data from
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// being sent to the kernel if an ifreq is reused.
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func (ifr *Ifreq) clear() {
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clear(ifr.raw.Ifru[:])
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}
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// TODO(mdlayher): export as IfreqData? For now we can provide helpers such as
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// IoctlGetEthtoolDrvinfo which use these APIs under the hood.
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// An ifreqData is an Ifreq which carries pointer data. To produce an ifreqData,
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// use the Ifreq.withData method.
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type ifreqData struct {
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name [IFNAMSIZ]byte
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// A type separate from ifreq is required in order to comply with the
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// unsafe.Pointer rules since the "pointer-ness" of data would not be
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// preserved if it were cast into the byte array of a raw ifreq.
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data unsafe.Pointer
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// Pad to the same size as ifreq.
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_ [len(ifreq{}.Ifru) - SizeofPtr]byte
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}
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// withData produces an ifreqData with the pointer p set for ioctls which require
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// arbitrary pointer data.
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func (ifr Ifreq) withData(p unsafe.Pointer) ifreqData {
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return ifreqData{
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name: ifr.raw.Ifrn,
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data: p,
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}
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}
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