mirror of
https://github.com/Luzifer/nginx-sso.git
synced 2024-12-21 05:11:17 +00:00
123 lines
3.9 KiB
Go
123 lines
3.9 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// +build darwin dragonfly freebsd netbsd openbsd
|
|
|
|
// Package route provides basic functions for the manipulation of
|
|
// packet routing facilities on BSD variants.
|
|
//
|
|
// The package supports any version of Darwin, any version of
|
|
// DragonFly BSD, FreeBSD 7 and above, NetBSD 6 and above, and OpenBSD
|
|
// 5.6 and above.
|
|
package route
|
|
|
|
import (
|
|
"errors"
|
|
"os"
|
|
"syscall"
|
|
)
|
|
|
|
var (
|
|
errUnsupportedMessage = errors.New("unsupported message")
|
|
errMessageMismatch = errors.New("message mismatch")
|
|
errMessageTooShort = errors.New("message too short")
|
|
errInvalidMessage = errors.New("invalid message")
|
|
errInvalidAddr = errors.New("invalid address")
|
|
errShortBuffer = errors.New("short buffer")
|
|
)
|
|
|
|
// A RouteMessage represents a message conveying an address prefix, a
|
|
// nexthop address and an output interface.
|
|
//
|
|
// Unlike other messages, this message can be used to query adjacency
|
|
// information for the given address prefix, to add a new route, and
|
|
// to delete or modify the existing route from the routing information
|
|
// base inside the kernel by writing and reading route messages on a
|
|
// routing socket.
|
|
//
|
|
// For the manipulation of routing information, the route message must
|
|
// contain appropriate fields that include:
|
|
//
|
|
// Version = <must be specified>
|
|
// Type = <must be specified>
|
|
// Flags = <must be specified>
|
|
// Index = <must be specified if necessary>
|
|
// ID = <must be specified>
|
|
// Seq = <must be specified>
|
|
// Addrs = <must be specified>
|
|
//
|
|
// The Type field specifies a type of manipulation, the Flags field
|
|
// specifies a class of target information and the Addrs field
|
|
// specifies target information like the following:
|
|
//
|
|
// route.RouteMessage{
|
|
// Version: RTM_VERSION,
|
|
// Type: RTM_GET,
|
|
// Flags: RTF_UP | RTF_HOST,
|
|
// ID: uintptr(os.Getpid()),
|
|
// Seq: 1,
|
|
// Addrs: []route.Addrs{
|
|
// RTAX_DST: &route.Inet4Addr{ ... },
|
|
// RTAX_IFP: &route.LinkAddr{ ... },
|
|
// RTAX_BRD: &route.Inet4Addr{ ... },
|
|
// },
|
|
// }
|
|
//
|
|
// The values for the above fields depend on the implementation of
|
|
// each operating system.
|
|
//
|
|
// The Err field on a response message contains an error value on the
|
|
// requested operation. If non-nil, the requested operation is failed.
|
|
type RouteMessage struct {
|
|
Version int // message version
|
|
Type int // message type
|
|
Flags int // route flags
|
|
Index int // interface index when atatched
|
|
ID uintptr // sender's identifier; usually process ID
|
|
Seq int // sequence number
|
|
Err error // error on requested operation
|
|
Addrs []Addr // addresses
|
|
|
|
extOff int // offset of header extension
|
|
raw []byte // raw message
|
|
}
|
|
|
|
// Marshal returns the binary encoding of m.
|
|
func (m *RouteMessage) Marshal() ([]byte, error) {
|
|
return m.marshal()
|
|
}
|
|
|
|
// A RIBType reprensents a type of routing information base.
|
|
type RIBType int
|
|
|
|
const (
|
|
RIBTypeRoute RIBType = syscall.NET_RT_DUMP
|
|
RIBTypeInterface RIBType = syscall.NET_RT_IFLIST
|
|
)
|
|
|
|
// FetchRIB fetches a routing information base from the operating
|
|
// system.
|
|
//
|
|
// The provided af must be an address family.
|
|
//
|
|
// The provided arg must be a RIBType-specific argument.
|
|
// When RIBType is related to routes, arg might be a set of route
|
|
// flags. When RIBType is related to network interfaces, arg might be
|
|
// an interface index or a set of interface flags. In most cases, zero
|
|
// means a wildcard.
|
|
func FetchRIB(af int, typ RIBType, arg int) ([]byte, error) {
|
|
mib := [6]int32{sysCTL_NET, sysAF_ROUTE, 0, int32(af), int32(typ), int32(arg)}
|
|
n := uintptr(0)
|
|
if err := sysctl(mib[:], nil, &n, nil, 0); err != nil {
|
|
return nil, os.NewSyscallError("sysctl", err)
|
|
}
|
|
if n == 0 {
|
|
return nil, nil
|
|
}
|
|
b := make([]byte, n)
|
|
if err := sysctl(mib[:], &b[0], &n, nil, 0); err != nil {
|
|
return nil, os.NewSyscallError("sysctl", err)
|
|
}
|
|
return b[:n], nil
|
|
}
|