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/*
Copyright (c) 2017 VMware, Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package toolbox
import (
"bytes"
"fmt"
"net"
xdr "github.com/davecgh/go-xdr/xdr2"
)
// Defs from: open-vm-tools/lib/guestRpc/nicinfo.x
type TypedIPAddress struct {
Type int32
Address []byte
}
type IPAddressEntry struct {
Address TypedIPAddress
PrefixLength uint32
Origin *int32 `xdr:"optional"`
Status *int32 `xdr:"optional"`
}
type InetCidrRouteEntry struct {
Dest TypedIPAddress
PrefixLength uint32
NextHop *TypedIPAddress `xdr:"optional"`
IfIndex uint32
Type int32
Metric uint32
}
type DNSConfigInfo struct {
HostName *string `xdr:"optional"`
DomainName *string `xdr:"optional"`
Servers []TypedIPAddress
Search *string `xdr:"optional"`
}
type WinsConfigInfo struct {
Primary TypedIPAddress
Secondary TypedIPAddress
}
type DhcpConfigInfo struct {
Enabled bool
Settings string
}
type GuestNicV3 struct {
MacAddress string
IPs []IPAddressEntry
DNSConfigInfo *DNSConfigInfo `xdr:"optional"`
WinsConfigInfo *WinsConfigInfo `xdr:"optional"`
DhcpConfigInfov4 *DhcpConfigInfo `xdr:"optional"`
DhcpConfigInfov6 *DhcpConfigInfo `xdr:"optional"`
}
type NicInfoV3 struct {
Nics []GuestNicV3
Routes []InetCidrRouteEntry
DNSConfigInfo *DNSConfigInfo `xdr:"optional"`
WinsConfigInfo *WinsConfigInfo `xdr:"optional"`
DhcpConfigInfov4 *DhcpConfigInfo `xdr:"optional"`
DhcpConfigInfov6 *DhcpConfigInfo `xdr:"optional"`
}
type GuestNicInfo struct {
Version int32
V3 *NicInfoV3 `xdr:"optional"`
}
func EncodeXDR(val interface{}) ([]byte, error) {
var buf bytes.Buffer
_, err := xdr.Marshal(&buf, val)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func DecodeXDR(buf []byte, val interface{}) error {
r := bytes.NewReader(buf)
_, err := xdr.Unmarshal(r, val)
return err
}
func NewGuestNicInfo() *GuestNicInfo {
return &GuestNicInfo{
Version: 3,
V3: &NicInfoV3{},
}
}
func (nic *GuestNicV3) AddIP(addr net.Addr) {
ip, ok := addr.(*net.IPNet)
if !ok {
return
}
kind := int32(1) // IAT_IPV4
if ip.IP.To4() == nil {
kind = 2 // IAT_IPV6
} else {
ip.IP = ip.IP.To4() // convert to 4-byte representation
}
size, _ := ip.Mask.Size()
// nicinfo.x defines enum IpAddressStatus, but vmtoolsd only uses IAS_PREFERRED
var status int32 = 1 // IAS_PREFERRED
e := IPAddressEntry{
Address: TypedIPAddress{
Type: kind,
Address: []byte(ip.IP),
},
PrefixLength: uint32(size),
Status: &status,
}
nic.IPs = append(nic.IPs, e)
}
func GuestInfoCommand(kind int, req []byte) []byte {
request := fmt.Sprintf("SetGuestInfo %d ", kind)
return append([]byte(request), req...)
}
var (
netInterfaces = net.Interfaces
maxNics = 16 // guestRpc/nicinfo.x:NICINFO_MAX_NICS
)
//
func DefaultGuestNicInfo() *GuestNicInfo {
proto := NewGuestNicInfo()
info := proto.V3
// #nosec: Errors unhandled
ifs, _ := netInterfaces()
for _, i := range ifs {
if i.Flags&net.FlagLoopback == net.FlagLoopback {
continue
}
if len(i.HardwareAddr) == 0 {
continue // Not useful from outside the guest without a MAC
}
// #nosec: Errors unhandled
addrs, _ := i.Addrs()
if len(addrs) == 0 {
continue // Not useful from outside the guest without an IP
}
nic := GuestNicV3{
MacAddress: i.HardwareAddr.String(),
}
for _, addr := range addrs {
nic.AddIP(addr)
}
info.Nics = append(info.Nics, nic)
if len(info.Nics) >= maxNics {
break
}
}
return proto
}
func GuestInfoNicInfoRequest() ([]byte, error) {
r, err := EncodeXDR(DefaultGuestNicInfo())
if err != nil {
return nil, err
}
return GuestInfoCommand(9 /*INFO_IPADDRESS_V3*/, r), nil
}
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