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cloudinit tests pass :)

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Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au>
This commit is contained in:
Sven Dowideit
2017-02-23 01:29:01 +00:00
parent 4f177ee605
commit be2c4044ce
72 changed files with 2683 additions and 1185 deletions
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202
vendor/github.com/vmware/vmw-guestinfo/LICENSE generated vendored Normal file
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Apache License
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5. Submission of Contributions. Unless You explicitly state otherwise,
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the terms of any separate license agreement you may have executed
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7. Disclaimer of Warranty. Unless required by applicable law or
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
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incidental, or consequential damages of any character arising as a
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the Work or Derivative Works thereof, You may choose to offer,
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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Copyright 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
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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3
vendor/github.com/vmware/vmw-guestinfo/README generated vendored Normal file
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This package provides access to the guestinfo variables exposed to a VMware virtual machine.
see examples/main.go for an example

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vendor/github.com/vmware/vmw-guestinfo/bdoor/bdoor.go generated vendored Normal file
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// Copyright 2016 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 bdoor
const (
BackdoorMagic = uint64(0x564D5868)
BackdoorPort = uint16(0x5658)
BackdoorHighBWPort = uint16(0x5659)
CommandGetVersion = uint32(10)
CommandMessage = uint16(0x1e)
CommandHighBWMessage = uint16(0)
CommandFlagCookie = uint32(0x80000000)
)
type BackdoorProto struct {
// typedef union {
// struct {
// DECLARE_REG_NAMED_STRUCT(ax);
// size_t size; /* Register bx. */
// DECLARE_REG_NAMED_STRUCT(cx);
// DECLARE_REG_NAMED_STRUCT(dx);
// DECLARE_REG_NAMED_STRUCT(si);
// DECLARE_REG_NAMED_STRUCT(di);
// } in;
// struct {
// DECLARE_REG_NAMED_STRUCT(ax);
// DECLARE_REG_NAMED_STRUCT(bx);
// DECLARE_REG_NAMED_STRUCT(cx);
// DECLARE_REG_NAMED_STRUCT(dx);
// DECLARE_REG_NAMED_STRUCT(si);
// DECLARE_REG_NAMED_STRUCT(di);
// } out;
// } proto;
AX, BX, CX, DX, SI, DI, BP UInt64
size uint32
}
func bdoor_inout(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
func bdoor_hbout(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
func bdoor_hbin(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
func bdoor_inout_test(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
func (p *BackdoorProto) InOut() *BackdoorProto {
p.DX.Low.Low = BackdoorPort
p.AX.SetQuad(BackdoorMagic)
retax, retbx, retcx, retdx, retsi, retdi, retbp := bdoor_inout(
p.AX.Quad(),
p.BX.Quad(),
p.CX.Quad(),
p.DX.Quad(),
p.SI.Quad(),
p.DI.Quad(),
p.BP.Quad(),
)
ret := &BackdoorProto{}
ret.AX.SetQuad(retax)
ret.BX.SetQuad(retbx)
ret.CX.SetQuad(retcx)
ret.DX.SetQuad(retdx)
ret.SI.SetQuad(retsi)
ret.DI.SetQuad(retdi)
ret.BP.SetQuad(retbp)
return ret
}
func (p *BackdoorProto) HighBandwidthOut() *BackdoorProto {
p.DX.Low.Low = BackdoorHighBWPort
p.AX.SetQuad(BackdoorMagic)
retax, retbx, retcx, retdx, retsi, retdi, retbp := bdoor_hbout(
p.AX.Quad(),
p.BX.Quad(),
p.CX.Quad(),
p.DX.Quad(),
p.SI.Quad(),
p.DI.Quad(),
p.BP.Quad(),
)
ret := &BackdoorProto{}
ret.AX.SetQuad(retax)
ret.BX.SetQuad(retbx)
ret.CX.SetQuad(retcx)
ret.DX.SetQuad(retdx)
ret.SI.SetQuad(retsi)
ret.DI.SetQuad(retdi)
ret.BP.SetQuad(retbp)
return ret
}
func (p *BackdoorProto) HighBandwidthIn() *BackdoorProto {
p.DX.Low.Low = BackdoorHighBWPort
p.AX.SetQuad(BackdoorMagic)
retax, retbx, retcx, retdx, retsi, retdi, retbp := bdoor_hbin(
p.AX.Quad(),
p.BX.Quad(),
p.CX.Quad(),
p.DX.Quad(),
p.SI.Quad(),
p.DI.Quad(),
p.BP.Quad(),
)
ret := &BackdoorProto{}
ret.AX.SetQuad(retax)
ret.BX.SetQuad(retbx)
ret.CX.SetQuad(retcx)
ret.DX.SetQuad(retdx)
ret.SI.SetQuad(retsi)
ret.DI.SetQuad(retdi)
ret.BP.SetQuad(retbp)
return ret
}

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vendor/github.com/vmware/vmw-guestinfo/bdoor/bdoor_amd64.s generated vendored Normal file
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#include "textflag.h"
// Doc of the golang plan9 assembler
// http://p9.nyx.link/labs/sys/doc/asm.html
//
// A good primer of how to write golang with some plan9 flavored assembly
// http://www.doxsey.net/blog/go-and-assembly
//
// Some x86 references
// http://www.eecg.toronto.edu/~amza/www.mindsec.com/files/x86regs.html
// https://cseweb.ucsd.edu/classes/sp10/cse141/pdf/02/S01_x86_64.key.pdf
// https://en.wikibooks.org/wiki/X86_Assembly/Other_Instructions
//
// (This one is invaluable. Has a working example of how a standard function
// call looks on the stack with the associated assembly.)
// https://www.recurse.com/blog/7-understanding-c-by-learning-assembly
//
// Reference with raw form of the Opcode
// http://x86.renejeschke.de/html/file_module_x86_id_139.html
//
// Massive x86_64 reference
// http://ref.x86asm.net/coder64.html#xED
//
// Adding instructions to the go assembler
// https://blog.klauspost.com/adding-unsupported-instructions-in-golang-assembler/
//
// Backdoor commands
// https://sites.google.com/site/chitchatvmback/backdoor
// func bdoor_inout(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
TEXT ·bdoor_inout(SB), NOSPLIT|WRAPPER, $0
MOVQ ax+0(FP), AX
MOVQ bx+8(FP), BX
MOVQ cx+16(FP), CX
MOVQ dx+24(FP), DX
MOVQ si+32(FP), SI
MOVQ di+40(FP), DI
MOVQ bp+48(FP), BP
// IN to DX from EAX
INL
MOVQ AX, retax+56(FP)
MOVQ BX, retbx+64(FP)
MOVQ CX, retcx+72(FP)
MOVQ DX, retdx+80(FP)
MOVQ SI, retsi+88(FP)
MOVQ DI, retdi+96(FP)
MOVQ BP, retbp+104(FP)
RET
// func bdoor_hbout(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
TEXT ·bdoor_hbout(SB), NOSPLIT|WRAPPER, $0
MOVQ ax+0(FP), AX
MOVQ bx+8(FP), BX
MOVQ cx+16(FP), CX
MOVQ dx+24(FP), DX
MOVQ si+32(FP), SI
MOVQ di+40(FP), DI
MOVQ bp+48(FP), BP
CLD; REP; OUTSB
MOVQ AX, retax+56(FP)
MOVQ BX, retbx+64(FP)
MOVQ CX, retcx+72(FP)
MOVQ DX, retdx+80(FP)
MOVQ SI, retsi+88(FP)
MOVQ DI, retdi+96(FP)
MOVQ BP, retbp+104(FP)
RET
// func bdoor_hbin(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
TEXT ·bdoor_hbin(SB), NOSPLIT|WRAPPER, $0
MOVQ ax+0(FP), AX
MOVQ bx+8(FP), BX
MOVQ cx+16(FP), CX
MOVQ dx+24(FP), DX
MOVQ si+32(FP), SI
MOVQ di+40(FP), DI
MOVQ bp+48(FP), BP
CLD; REP; INSB
MOVQ AX, retax+56(FP)
MOVQ BX, retbx+64(FP)
MOVQ CX, retcx+72(FP)
MOVQ DX, retdx+80(FP)
MOVQ SI, retsi+88(FP)
MOVQ DI, retdi+96(FP)
MOVQ BP, retbp+104(FP)
RET
// func bdoor_inout_test(ax, bx, cx, dx, si, di, bp uint64) (retax, retbx, retcx, retdx, retsi, retdi, retbp uint64)
TEXT ·bdoor_inout_test(SB), NOSPLIT|WRAPPER, $0
MOVQ ax+0(FP), AX
MOVQ bx+8(FP), BX
MOVQ cx+16(FP), CX
MOVQ dx+24(FP), DX
MOVQ si+32(FP), SI
MOVQ di+40(FP), DI
MOVQ bp+48(FP), BP
MOVQ AX, retax+56(FP)
MOVQ BX, retbx+64(FP)
MOVQ CX, retcx+72(FP)
MOVQ DX, retdx+80(FP)
MOVQ SI, retsi+88(FP)
MOVQ DI, retdi+96(FP)
MOVQ BP, retbp+104(FP)
RET

43
vendor/github.com/vmware/vmw-guestinfo/bdoor/word.go generated vendored Normal file
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// Copyright 2016 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 bdoor
type UInt32 struct {
High uint16
Low uint16
}
func (u *UInt32) Word() uint32 {
return uint32(u.High)<<16 + uint32(u.Low)
}
func (u *UInt32) SetWord(w uint32) {
u.High = uint16(w >> 16)
u.Low = uint16(w)
}
type UInt64 struct {
High UInt32
Low UInt32
}
func (u *UInt64) Quad() uint64 {
return uint64(u.High.Word())<<32 + uint64(u.Low.Word())
}
func (u *UInt64) SetQuad(w uint64) {
u.High.SetWord(uint32(w >> 32))
u.Low.SetWord(uint32(w))
}

61
vendor/github.com/vmware/vmw-guestinfo/message/log.go generated vendored Normal file
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// Copyright 2016 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 message
import "log"
var DefaultLogger Logger
type Logger interface {
Errorf(format string, args ...interface{})
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
}
func init() {
DefaultLogger = &logger{}
}
type logger struct {
DebugLevel bool
}
func (l *logger) Errorf(format string, args ...interface{}) {
log.Printf(format, args...)
}
func (l *logger) Debugf(format string, args ...interface{}) {
if !l.DebugLevel {
return
}
log.Printf(format, args...)
}
func (l *logger) Infof(format string, args ...interface{}) {
log.Printf(format, args...)
}
func Errorf(format string, args ...interface{}) {
DefaultLogger.Errorf(format, args...)
}
func Debugf(format string, args ...interface{}) {
DefaultLogger.Debugf(format, args...)
}
func Infof(format string, args ...interface{}) {
DefaultLogger.Infof(format, args...)
}

334
vendor/github.com/vmware/vmw-guestinfo/message/message.go generated vendored Normal file
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// Copyright 2016 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 message
import (
"bytes"
"encoding/binary"
"errors"
"unsafe"
"github.com/vmware/vmw-guestinfo/bdoor"
)
const (
messageTypeOpen = iota
messageTypeSendSize
messageTypeSendPayload
messageTypeReceiveSize
messageTypeReceivePayload
messageTypeReceiveStatus
messageTypeClose
messageStatusFail = uint16(0x0000)
messageStatusSuccess = uint16(0x0001)
messageStatusDoRecieve = uint16(0x0002)
messageStatusCheckPoint = uint16(0x0010)
messageStatusHighBW = uint16(0x0080)
)
var (
// ErrChannelOpen represents a failure to open a channel
ErrChannelOpen = errors.New("could not open channel")
// ErrChannelClose represents a failure to close a channel
ErrChannelClose = errors.New("could not close channel")
// ErrRpciSend represents a failure to send a message
ErrRpciSend = errors.New("unable to send RPCI command")
// ErrRpciReceive represents a failure to receive a message
ErrRpciReceive = errors.New("unable to receive RPCI command result")
)
type Channel struct {
id uint16
forceLowBW bool
buf []byte
cookie bdoor.UInt64
}
// NewChannel opens a new Channel
func NewChannel(proto uint32) (*Channel, error) {
flags := bdoor.CommandFlagCookie
retry:
bp := &bdoor.BackdoorProto{}
bp.BX.Low.SetWord(proto | flags)
bp.CX.Low.High = messageTypeOpen
bp.CX.Low.Low = bdoor.CommandMessage
out := bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
if flags != 0 {
flags = 0
goto retry
}
Errorf("Message: Unable to open communication channel")
return nil, ErrChannelOpen
}
ch := &Channel{}
ch.id = out.DX.Low.High
ch.cookie.High.SetWord(out.SI.Low.Word())
ch.cookie.Low.SetWord(out.DI.Low.Word())
Debugf("Opened channel %d", ch.id)
return ch, nil
}
func (c *Channel) Close() error {
bp := &bdoor.BackdoorProto{}
bp.CX.Low.High = messageTypeClose
bp.CX.Low.Low = bdoor.CommandMessage
bp.DX.Low.High = c.id
bp.SI.Low.SetWord(c.cookie.High.Word())
bp.DI.Low.SetWord(c.cookie.Low.Word())
out := bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
Errorf("Message: Unable to close communication channel %d", c.id)
return ErrChannelClose
}
Debugf("Closed channel %d", c.id)
return nil
}
func (c *Channel) Send(buf []byte) error {
retry:
bp := &bdoor.BackdoorProto{}
bp.CX.Low.High = messageTypeSendSize
bp.CX.Low.Low = bdoor.CommandMessage
bp.DX.Low.High = c.id
bp.SI.Low.SetWord(c.cookie.High.Word())
bp.DI.Low.SetWord(c.cookie.Low.Word())
bp.BX.Low.SetWord(uint32(len(buf)))
// send the size
out := bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
Errorf("Message: Unable to send a message over the communication channel %d", c.id)
return ErrRpciSend
}
// size of buf 0 is fine, just return
if len(buf) == 0 {
return nil
}
if !c.forceLowBW && (out.CX.Low.High&messageStatusHighBW) == messageStatusHighBW {
hbbp := &bdoor.BackdoorProto{}
hbbp.BX.Low.Low = bdoor.CommandHighBWMessage
hbbp.BX.Low.High = messageStatusSuccess
hbbp.DX.Low.High = c.id
hbbp.BP.Low.SetWord(c.cookie.High.Word())
hbbp.DI.Low.SetWord(c.cookie.Low.Word())
hbbp.CX.Low.SetWord(uint32(len(buf)))
hbbp.SI.SetQuad(uint64(uintptr(unsafe.Pointer(&buf[0]))))
out := hbbp.HighBandwidthOut()
if (out.BX.Low.High & messageStatusSuccess) == 0 {
if (out.BX.Low.High & messageStatusCheckPoint) != 0 {
Debugf("A checkpoint occurred. Retrying the operation")
goto retry
}
Errorf("Message: Unable to send a message over the communication channel %d", c.id)
return ErrRpciSend
}
} else {
bp.CX.Low.High = messageTypeSendPayload
bbuf := bytes.NewBuffer(buf)
for {
// read 4 bytes at a time
words := bbuf.Next(4)
if len(words) == 0 {
break
}
Debugf("sending %q over %d", string(words), c.id)
switch len(words) {
case 3:
bp.BX.Low.SetWord(binary.LittleEndian.Uint32([]byte{0x0, words[2], words[1], words[0]}))
case 2:
bp.BX.Low.SetWord(uint32(binary.LittleEndian.Uint16(words)))
case 1:
bp.BX.Low.SetWord(uint32(words[0]))
default:
bp.BX.Low.SetWord(binary.LittleEndian.Uint32(words))
}
out = bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
Errorf("Message: Unable to send a message over the communication channel %d", c.id)
return ErrRpciSend
}
}
}
return nil
}
func (c *Channel) Receive() ([]byte, error) {
retry:
var err error
bp := &bdoor.BackdoorProto{}
bp.CX.Low.High = messageTypeReceiveSize
bp.CX.Low.Low = bdoor.CommandMessage
bp.DX.Low.High = c.id
bp.SI.Low.SetWord(c.cookie.High.Word())
bp.DI.Low.SetWord(c.cookie.Low.Word())
out := bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
Errorf("Message: Unable to poll for messages over the communication channel %d", c.id)
return nil, ErrRpciReceive
}
if (out.CX.Low.High & messageStatusDoRecieve) == 0 {
Debugf("No message to retrieve")
return nil, nil
}
// Receive the size.
if out.DX.Low.High != messageTypeSendSize {
Errorf("Message: Protocol error. Expected a MESSAGE_TYPE_SENDSIZE request from vmware")
return nil, ErrRpciReceive
}
size := out.BX.Quad()
var buf []byte
if size != 0 {
if !c.forceLowBW && (out.CX.Low.High&messageStatusHighBW == messageStatusHighBW) {
buf = make([]byte, size)
hbbp := &bdoor.BackdoorProto{}
hbbp.BX.Low.Low = bdoor.CommandHighBWMessage
hbbp.BX.Low.High = messageStatusSuccess
hbbp.DX.Low.High = c.id
hbbp.SI.Low.SetWord(c.cookie.High.Word())
hbbp.BP.Low.SetWord(c.cookie.Low.Word())
hbbp.CX.Low.SetWord(uint32(len(buf)))
hbbp.DI.SetQuad(uint64(uintptr(unsafe.Pointer(&buf[0]))))
out := hbbp.HighBandwidthIn()
if (out.BX.Low.High & messageStatusSuccess) == 0 {
Errorf("Message: Unable to send a message over the communication channel %d", c.id)
c.reply(messageTypeReceivePayload, messageStatusFail)
return nil, ErrRpciReceive
}
} else {
b := bytes.NewBuffer(make([]byte, 0, size))
for {
if size == 0 {
break
}
bp.CX.Low.High = messageTypeReceivePayload
bp.BX.Low.Low = messageStatusSuccess
out = bp.InOut()
if (out.CX.Low.High & messageStatusSuccess) == 0 {
if (out.CX.Low.High & messageStatusCheckPoint) != 0 {
Debugf("A checkpoint occurred. Retrying the operation")
goto retry
}
Errorf("Message: Unable to receive a message over the communication channel %d", c.id)
c.reply(messageTypeReceivePayload, messageStatusFail)
return nil, ErrRpciReceive
}
if out.DX.Low.High != messageTypeSendPayload {
Errorf("Message: Protocol error. Expected a MESSAGE_TYPE_SENDPAYLOAD from vmware")
c.reply(messageTypeReceivePayload, messageStatusFail)
return nil, ErrRpciReceive
}
Debugf("Received %#v", out.BX.Low.Word())
switch size {
case 1:
err = binary.Write(b, binary.LittleEndian, uint8(out.BX.Low.Low))
size = size - 1
case 2:
err = binary.Write(b, binary.LittleEndian, uint16(out.BX.Low.Low))
size = size - 2
case 3:
err = binary.Write(b, binary.LittleEndian, uint16(out.BX.Low.Low))
if err != nil {
c.reply(messageTypeReceivePayload, messageStatusFail)
return nil, ErrRpciReceive
}
err = binary.Write(b, binary.LittleEndian, uint8(out.BX.Low.High))
size = size - 3
default:
err = binary.Write(b, binary.LittleEndian, out.BX.Low.Word())
size = size - 4
}
if err != nil {
Errorf(err.Error())
c.reply(messageTypeReceivePayload, messageStatusFail)
return nil, ErrRpciReceive
}
}
buf = b.Bytes()
}
}
c.reply(messageTypeReceiveStatus, messageStatusSuccess)
return buf, nil
}
func (c *Channel) reply(messageType, messageStatus uint16) {
bp := &bdoor.BackdoorProto{}
bp.BX.Low.Low = messageStatus
bp.CX.Low.High = messageType
bp.CX.Low.Low = bdoor.CommandMessage
bp.DX.Low.High = c.id
bp.SI.Low.SetWord(c.cookie.High.Word())
bp.DI.Low.SetWord(c.cookie.Low.Word())
out := bp.InOut()
/* OUT: Status */
if (out.CX.Low.High & messageStatusSuccess) == 0 {
if messageStatus == messageStatusSuccess {
Errorf("reply Message: Unable to send a message over the communication channel %d", c.id)
} else {
Errorf("reply Message: Unable to signal an error of reception over the communication channel %d", c.id)
}
}
}

93
vendor/github.com/vmware/vmw-guestinfo/rpcout/rpcout.go generated vendored Normal file
View File

@@ -0,0 +1,93 @@
// Copyright 2016 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 rpcout
import (
"errors"
"fmt"
"github.com/vmware/vmw-guestinfo/message"
)
// ErrRpciFormat represents an invalid result format
var ErrRpciFormat = errors.New("invalid format for RPCI command result")
const rpciProtocolNum uint32 = 0x49435052
// SendOne is a command-oriented wrapper for SendOneRaw
func SendOne(format string, a ...interface{}) (reply []byte, ok bool, err error) {
request := fmt.Sprintf(format, a...)
return SendOneRaw([]byte(request))
}
// SendOneRaw uses a throw-away RPCOut to send a request
func SendOneRaw(request []byte) (reply []byte, ok bool, err error) {
out := &RPCOut{}
if err = out.Start(); err != nil {
return
}
if reply, ok, err = out.Send(request); err != nil {
return
}
if err = out.Stop(); err != nil {
return
}
return
}
// RPCOut is an ougoing connection from the VM to the hypervisor
type RPCOut struct {
channel *message.Channel
}
// Start opens the connection
func (out *RPCOut) Start() error {
channel, err := message.NewChannel(rpciProtocolNum)
if err != nil {
return err
}
out.channel = channel
return nil
}
// Stop closes the connection
func (out *RPCOut) Stop() error {
err := out.channel.Close()
out.channel = nil
return err
}
// Send emits a request and receives a response
func (out *RPCOut) Send(request []byte) (reply []byte, ok bool, err error) {
if err = out.channel.Send(request); err != nil {
return
}
var resp []byte
if resp, err = out.channel.Receive(); err != nil {
return
}
switch string(resp[:2]) {
case "0 ":
reply = resp[2:]
case "1 ":
reply = resp[2:]
ok = true
default:
err = ErrRpciFormat
}
return
}