protocol

package
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 Go to latest Published: Apr 5, 2018 License: BSD-3-Clause Imports: 11 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	MSIZE   = 2*1048576 + IOHDRSZ // default message size (1048576+IOHdrSz)
	IOHDRSZ = 24                  // the non-data size of the Twrite messages
	PORT    = 564                 // default port for 9P file servers
	NumFID  = 1 << 16
	QIDLen  = 13
)
View Source 
const (
	QTDIR     = 0x80 // directories
	QTAPPEND  = 0x40 // append only files
	QTEXCL    = 0x20 // exclusive use files
	QTMOUNT   = 0x10 // mounted channel
	QTAUTH    = 0x08 // authentication file
	QTTMP     = 0x04 // non-backed-up file
	QTSYMLINK = 0x02 // symbolic link (Unix, 9P2000.u)
	QTLINK    = 0x01 // hard link (Unix, 9P2000.u)
	QTFILE    = 0x00
)

QID types

View Source 
const (
	OREAD   = 0x0    // open read-only
	OWRITE  = 0x1    // open write-only
	ORDWR   = 0x2    // open read-write
	OEXEC   = 0x3    // execute (== read but check execute permission)
	OTRUNC  = 0x10   // or'ed in (except for exec), truncate file first
	OCEXEC  = 0x20   // or'ed in, close on exec
	ORCLOSE = 0x40   // or'ed in, remove on close
	OAPPEND = 0x80   // or'ed in, append only
	OEXCL   = 0x1000 // or'ed in, exclusive client use
)

Flags for the mode field in Topen and Tcreate messages

View Source 
const (
	DMDIR    = 0x80000000 // mode bit for directories
	DMAPPEND = 0x40000000 // mode bit for append only files
	DMEXCL   = 0x20000000 // mode bit for exclusive use files
	DMMOUNT  = 0x10000000 // mode bit for mounted channel
	DMAUTH   = 0x08000000 // mode bit for authentication file
	DMTMP    = 0x04000000 // mode bit for non-backed-up file
	DMREAD   = 0x4        // mode bit for read permission
	DMWRITE  = 0x2        // mode bit for write permission
	DMEXEC   = 0x1        // mode bit for execute permission
)

File modes

View Source 
const (
	NOTAG Tag = 0xFFFF     // no tag specified
	NOFID FID = 0xFFFFFFFF // no fid specified
	// We reserve tag NOTAG and tag 0. 0 is a troublesome value to pass
	// around, since it is also a default value and using it can hide errors
	// in the code.
	NumTags = 1<<16 - 2
)
View Source 
const (
	EPERM   = 1
	ENOENT  = 2
	EIO     = 5
	EACCES  = 13
	EEXIST  = 17
	ENOTDIR = 20
	EINVAL  = 22
)

Error values

Variables

View Source 
var (
	RPCNames = map[MType]string{
		Tversion: "Tversion",
		Rversion: "Rversion",
		Tauth:    "Tauth",
		Rauth:    "Rauth",
		Tattach:  "Tattach",
		Rattach:  "Rattach",
		Terror:   "Terror",
		Rerror:   "Rerror",
		Tflush:   "Tflush",
		Rflush:   "Rflush",
		Twalk:    "Twalk",
		Rwalk:    "Rwalk",
		Topen:    "Topen",
		Ropen:    "Ropen",
		Tcreate:  "Tcreate",
		Rcreate:  "Rcreate",
		Tread:    "Tread",
		Rread:    "Rread",
		Twrite:   "Twrite",
		Rwrite:   "Rwrite",
		Tclunk:   "Tclunk",
		Rclunk:   "Rclunk",
		Tremove:  "Tremove",
		Rremove:  "Rremove",
		Tstat:    "Tstat",
		Rstat:    "Rstat",
		Twstat:   "Twstat",
		Rwstat:   "Rwstat",
	}
)

Functions

func Dispatch 

func Dispatch(s *Server, b *bytes.Buffer, t MType) error

Dispatch dispatches request to different functions. It's also the the first place we try to establish server semantics. We could do this with interface assertions and such a la rsc/fuse but most people I talked do disliked that. So we don't. If you want to make things optional, just define the ones you want to implement in this case.

func MarshalRattachPkt 

func MarshalRattachPkt(b *bytes.Buffer, t Tag, QID QID)

func MarshalRclunkPkt 

func MarshalRclunkPkt(b *bytes.Buffer, t Tag)

func MarshalRcreatePkt 

func MarshalRcreatePkt(b *bytes.Buffer, t Tag, OQID QID, IOUnit MaxSize)

func MarshalRerrorPkt 

func MarshalRerrorPkt(b *bytes.Buffer, t Tag, Error string)

func MarshalRflushPkt 

func MarshalRflushPkt(b *bytes.Buffer, t Tag)

func MarshalRopenPkt 

func MarshalRopenPkt(b *bytes.Buffer, t Tag, OQID QID, IOUnit MaxSize)

func MarshalRreadPkt 

func MarshalRreadPkt(b *bytes.Buffer, t Tag, Data []uint8)

func MarshalRremovePkt 

func MarshalRremovePkt(b *bytes.Buffer, t Tag)

func MarshalRstatPkt 

func MarshalRstatPkt(b *bytes.Buffer, t Tag, B []byte)

func MarshalRversionPkt 

func MarshalRversionPkt(b *bytes.Buffer, t Tag, RMsize MaxSize, RVersion string)

func MarshalRwalkPkt 

func MarshalRwalkPkt(b *bytes.Buffer, t Tag, QIDs []QID)

func MarshalRwritePkt 

func MarshalRwritePkt(b *bytes.Buffer, t Tag, RLen Count)

func MarshalRwstatPkt 

func MarshalRwstatPkt(b *bytes.Buffer, t Tag)

func MarshalTattachPkt 

func MarshalTattachPkt(b *bytes.Buffer, t Tag, SFID FID, AFID FID, Uname string, Aname string)

func MarshalTclunkPkt 

func MarshalTclunkPkt(b *bytes.Buffer, t Tag, OFID FID)

func MarshalTcreatePkt 

func MarshalTcreatePkt(b *bytes.Buffer, t Tag, OFID FID, Name string, CreatePerm Perm, Omode Mode)

func MarshalTflushPkt 

func MarshalTflushPkt(b *bytes.Buffer, t Tag, OTag Tag)

func MarshalTopenPkt 

func MarshalTopenPkt(b *bytes.Buffer, t Tag, OFID FID, Omode Mode)

func MarshalTreadPkt 

func MarshalTreadPkt(b *bytes.Buffer, t Tag, OFID FID, Off Offset, Len Count)

func MarshalTremovePkt 

func MarshalTremovePkt(b *bytes.Buffer, t Tag, OFID FID)

func MarshalTstatPkt 

func MarshalTstatPkt(b *bytes.Buffer, t Tag, OFID FID)

func MarshalTversionPkt 

func MarshalTversionPkt(b *bytes.Buffer, t Tag, TMsize MaxSize, TVersion string)

func MarshalTwalkPkt 

func MarshalTwalkPkt(b *bytes.Buffer, t Tag, SFID FID, NewFID FID, Paths []string)

func MarshalTwritePkt 

func MarshalTwritePkt(b *bytes.Buffer, t Tag, OFID FID, Off Offset, Data []uint8)

func MarshalTwstatPkt 

func MarshalTwstatPkt(b *bytes.Buffer, t Tag, OFID FID, B []byte)

func Marshaldir 

func Marshaldir(b *bytes.Buffer, D Dir)

func ServerError 

func ServerError(b *bytes.Buffer, s string)

func UnmarshalRattachPkt 

func UnmarshalRattachPkt(b *bytes.Buffer) (QID QID, t Tag, err error)

func UnmarshalRcreatePkt 

func UnmarshalRcreatePkt(b *bytes.Buffer) (OQID QID, IOUnit MaxSize, t Tag, err error)

func UnmarshalRopenPkt 

func UnmarshalRopenPkt(b *bytes.Buffer) (OQID QID, IOUnit MaxSize, t Tag, err error)

func UnmarshalRversionPkt 

func UnmarshalRversionPkt(b *bytes.Buffer) (RMsize MaxSize, RVersion string, t Tag, err error)

func UnmarshalRwalkPkt 

func UnmarshalRwalkPkt(b *bytes.Buffer) (QIDs []QID, t Tag, err error)

func UnmarshalRwritePkt 

func UnmarshalRwritePkt(b *bytes.Buffer) (RLen Count, t Tag, err error)

func UnmarshalTattachPkt 

func UnmarshalTattachPkt(b *bytes.Buffer) (SFID FID, AFID FID, Uname string, Aname string, t Tag, err error)

func UnmarshalTclunkPkt 

func UnmarshalTclunkPkt(b *bytes.Buffer) (OFID FID, t Tag, err error)

func UnmarshalTcreatePkt 

func UnmarshalTcreatePkt(b *bytes.Buffer) (OFID FID, Name string, CreatePerm Perm, Omode Mode, t Tag, err error)

func UnmarshalTflushPkt 

func UnmarshalTflushPkt(b *bytes.Buffer) (OTag Tag, t Tag, err error)

func UnmarshalTopenPkt 

func UnmarshalTopenPkt(b *bytes.Buffer) (OFID FID, Omode Mode, t Tag, err error)

func UnmarshalTreadPkt 

func UnmarshalTreadPkt(b *bytes.Buffer) (OFID FID, Off Offset, Len Count, t Tag, err error)

func UnmarshalTremovePkt 

func UnmarshalTremovePkt(b *bytes.Buffer) (OFID FID, t Tag, err error)

func UnmarshalTstatPkt 

func UnmarshalTstatPkt(b *bytes.Buffer) (OFID FID, t Tag, err error)

func UnmarshalTversionPkt 

func UnmarshalTversionPkt(b *bytes.Buffer) (TMsize MaxSize, TVersion string, t Tag, err error)

func UnmarshalTwalkPkt 

func UnmarshalTwalkPkt(b *bytes.Buffer) (SFID FID, NewFID FID, Paths []string, t Tag, err error)

func UnmarshalTwritePkt 

func UnmarshalTwritePkt(b *bytes.Buffer) (OFID FID, Off Offset, Data []uint8, t Tag, err error)

func UnmarshalTwstatPkt 

func UnmarshalTwstatPkt(b *bytes.Buffer) (OFID FID, B []byte, t Tag, err error)

Types

type Client 

type Client struct {
	Tags       chan Tag
	FID        uint64
	RPC        []*RPCCall
	ToNet      io.WriteCloser
	FromNet    io.ReadCloser
	FromClient chan *RPCCall
	FromServer chan *RPCReply
	Msize      uint32
	Dead       bool
	Trace      Tracer
}

Client implements a 9p client. It has a chan containing all tags, a scalar FID which is incremented to provide new FIDS (all FIDS for a given client are unique), an array of MaxTag-2 RPC structs, a ReadWriteCloser for IO, and two channels for a server goroutine: one down which RPCalls are pushed and another from which RPCReplys return. Once a client is marked Dead all further requests to it will fail. The ToNet/FromNet are separate so we can use io.Pipe for testing.

func NewClient 

func NewClient(opts ...ClientOpt) (*Client, error)

func (*Client) CallTattach 

func (c *Client) CallTattach(SFID FID, AFID FID, Uname string, Aname string) (QID QID, err error)

func (*Client) CallTclunk 

func (c *Client) CallTclunk(OFID FID) (err error)

func (*Client) CallTcreate 

func (c *Client) CallTcreate(OFID FID, Name string, CreatePerm Perm, Omode Mode) (OQID QID, IOUnit MaxSize, err error)

func (*Client) CallTflush 

func (c *Client) CallTflush(OTag Tag) (err error)

func (*Client) CallTopen 

func (c *Client) CallTopen(OFID FID, Omode Mode) (OQID QID, IOUnit MaxSize, err error)

func (*Client) CallTread 

func (c *Client) CallTread(OFID FID, Off Offset, Len Count) (Data []uint8, err error)

func (*Client) CallTremove 

func (c *Client) CallTremove(OFID FID) (err error)

func (*Client) CallTstat 

func (c *Client) CallTstat(OFID FID) (B []byte, err error)

func (*Client) CallTversion 

func (c *Client) CallTversion(TMsize MaxSize, TVersion string) (RMsize MaxSize, RVersion string, err error)

func (*Client) CallTwalk 

func (c *Client) CallTwalk(SFID FID, NewFID FID, Paths []string) (QIDs []QID, err error)

func (*Client) CallTwrite 

func (c *Client) CallTwrite(OFID FID, Off Offset, Data []uint8) (RLen Count, err error)

func (*Client) CallTwstat 

func (c *Client) CallTwstat(OFID FID, B []byte) (err error)

func (*Client) GetFID 

func (c *Client) GetFID() FID

GetFID gets a fid to be used to identify a resource for a 9p client. For a given lifetime of a 9p client, FIDS are unique (i.e. not reused as in many 9p client libraries).

func (*Client) GetTag 

func (c *Client) GetTag() Tag

GetTag gets a tag to be used to identify a message.

func (*Client) IO 

func (c *Client) IO()

func (*Client) String 

func (c *Client) String() string

type ClientOpt 

type ClientOpt func(*Client) error

rpc servers

type Count 

type Count int32

Types contained in 9p messages.

type Data 

type Data []byte

Types contained in 9p messages.

type DataCnt16 

type DataCnt16 byte // []byte with a 16-bit count.

Some []byte fields are encoded with a 16-bit length, e.g. stat data. We use this type to tag such fields. The parameters are still []byte, this was just the only way I could think of to make the stub generator do the right thing.

type Dir 

type Dir struct {
	Type    uint16
	Dev     uint32
	QID     QID    // file's QID
	Mode    uint32 // permissions and flags
	Atime   uint32 // last access time in seconds
	Mtime   uint32 // last modified time in seconds
	Length  uint64 // file length in bytes
	Name    string // file name
	User    string // owner name
	Group   string // group name
	ModUser string // name of the last user that modified the file
}

Dir describes a file

func Unmarshaldir 

func Unmarshaldir(b *bytes.Buffer) (D Dir, err error)

type DirPkt 

type DirPkt struct {
	D Dir
}

type Dispatcher 

type Dispatcher func(s *Server, b *bytes.Buffer, t MType) error

type Error 

type Error struct {
	Err string
}

Error represents a 9P2000 error

type FID 

type FID uint32

Types contained in 9p messages.

type File 

type File struct {
}

A File is defined by a QID. File Servers never see a FID. There are two channels. The first is for normal requests. The second is for Flushes. File server code always checks the flush channel first. At the same time, server code puts the flush into both channels, so the server code has some idea when the flush entered the queue. This is very similar to how MSI-X works on PCIe ...

type FileServer 

type FileServer struct {
	Server
	Versioned bool
}

Server maintains file system server state. This is inclusive of RPC server state plus more. In our case when we walk to a fid we kick off a goroutine to manage it. As a result we need a map of Tag to FID so we know what to do about Tflush.

type MType 

type MType uint8

Types contained in 9p messages. 

const (
	Tversion MType = 100 + iota
	Rversion
	Tauth
	Rauth
	Tattach
	Rattach
	Terror
	Rerror
	Tflush
	Rflush
	Twalk
	Rwalk
	Topen
	Ropen
	Tcreate
	Rcreate
	Tread
	Rread
	Twrite
	Rwrite
	Tclunk
	Rclunk
	Tremove
	Rremove
	Tstat
	Rstat
	Twstat
	Rwstat
	Tlast
)

9P2000 message types

type MaxSize 

type MaxSize uint32

Types contained in 9p messages.

type Mode 

type Mode uint8

Types contained in 9p messages.

type NineServer 

type NineServer interface {
	Rversion(MaxSize, string) (MaxSize, string, error)
	Rattach(FID, FID, string, string) (QID, error)
	Rwalk(FID, FID, []string) ([]QID, error)
	Ropen(FID, Mode) (QID, MaxSize, error)
	Rcreate(FID, string, Perm, Mode) (QID, MaxSize, error)
	Rstat(FID) ([]byte, error)
	Rwstat(FID, []byte) error
	Rclunk(FID) error
	Rremove(FID) error
	Rread(FID, Offset, Count) ([]byte, error)
	Rwrite(FID, Offset, []byte) (Count, error)
	Rflush(Otag Tag) error
}

type NumEntries 

type NumEntries uint16

Types contained in 9p messages.

type Offset 

type Offset uint64

Types contained in 9p messages.

type Perm 

type Perm uint32

Types contained in 9p messages.

type QID 

type QID struct {
	Type    uint8  // type of the file (high 8 bits of the mode)
	Version uint32 // version number for the path
	Path    uint64 // server's unique identification of the file
}

File identifier

type RPCCall 

type RPCCall struct {
	Reply chan []byte
	// contains filtered or unexported fields
}

type RPCReply 

type RPCReply struct {
	// contains filtered or unexported fields
}

type RattachPkt 

type RattachPkt struct {
	QID QID
}

type RclunkPkt 

type RclunkPkt struct {
}

type RcreatePkt 

type RcreatePkt struct {
	OQID   QID
	IOUnit MaxSize
}

type RerrorPkt 

type RerrorPkt struct {
	Error string
}

type RflushPkt 

type RflushPkt struct {
}

type RopenPkt 

type RopenPkt struct {
	OQID   QID
	IOUnit MaxSize
}

type RreadPkt 

type RreadPkt struct {
	Data []byte
}

type RremovePkt 

type RremovePkt struct {
}

type RstatPkt 

type RstatPkt struct {
	B []DataCnt16
}

type RversionPkt 

type RversionPkt struct {
	RMsize   MaxSize
	RVersion string
}

type RwalkPkt 

type RwalkPkt struct {
	QIDs []QID
}

type RwritePkt 

type RwritePkt struct {
	RLen Count
}

type RwstatPkt 

type RwstatPkt struct {
}

type Server 

type Server struct {
	NS        NineServer
	D         Dispatcher
	Versioned bool
	FromNet   io.ReadCloser
	ToNet     io.WriteCloser
	Replies   chan RPCReply
	Trace     Tracer
	Dead      bool
	// contains filtered or unexported fields
}

Server is a 9p server. For now it's extremely serial. But we will use a chan for replies to ensure that we can go to a more concurrent one later.

func NewServer 

func NewServer(ns NineServer, opts ...ServerOpt) (*Server, error)

func (*Server) NineServer 

func (s *Server) NineServer() NineServer

func (*Server) SrvRattach 

func (s *Server) SrvRattach(b *bytes.Buffer) (err error)

func (*Server) SrvRclunk 

func (s *Server) SrvRclunk(b *bytes.Buffer) (err error)

func (*Server) SrvRcreate 

func (s *Server) SrvRcreate(b *bytes.Buffer) (err error)

func (*Server) SrvRflush 

func (s *Server) SrvRflush(b *bytes.Buffer) (err error)

func (*Server) SrvRopen 

func (s *Server) SrvRopen(b *bytes.Buffer) (err error)

func (*Server) SrvRread 

func (s *Server) SrvRread(b *bytes.Buffer) (err error)

func (*Server) SrvRremove 

func (s *Server) SrvRremove(b *bytes.Buffer) (err error)

func (*Server) SrvRstat 

func (s *Server) SrvRstat(b *bytes.Buffer) (err error)

func (*Server) SrvRversion 

func (s *Server) SrvRversion(b *bytes.Buffer) (err error)

func (*Server) SrvRwalk 

func (s *Server) SrvRwalk(b *bytes.Buffer) (err error)

func (*Server) SrvRwrite 

func (s *Server) SrvRwrite(b *bytes.Buffer) (err error)

func (*Server) SrvRwstat 

func (s *Server) SrvRwstat(b *bytes.Buffer) (err error)

func (*Server) Start 

func (s *Server) Start()

func (*Server) String 

func (s *Server) String() string

type ServerOpt 

type ServerOpt func(*Server) error

type Service 

type Service func(func() error, chan FID)

A service is a closure which returns an error or nil. It writes its result down the provided channel. It looks for flushes on the flushchan before doing its function, and will respond to all flushes while any are pending.

type Tag 

type Tag uint16

Types contained in 9p messages.

func UnmarshalRclunkPkt 

func UnmarshalRclunkPkt(b *bytes.Buffer) (t Tag, err error)

func UnmarshalRerrorPkt 

func UnmarshalRerrorPkt(b *bytes.Buffer) (Error string, t Tag, err error)

func UnmarshalRflushPkt 

func UnmarshalRflushPkt(b *bytes.Buffer) (t Tag, err error)

func UnmarshalRreadPkt 

func UnmarshalRreadPkt(b *bytes.Buffer) (Data []uint8, t Tag, err error)

func UnmarshalRremovePkt 

func UnmarshalRremovePkt(b *bytes.Buffer) (t Tag, err error)

func UnmarshalRstatPkt 

func UnmarshalRstatPkt(b *bytes.Buffer) (B []byte, t Tag, err error)

func UnmarshalRwstatPkt 

func UnmarshalRwstatPkt(b *bytes.Buffer) (t Tag, err error)

type TattachPkt 

type TattachPkt struct {
	SFID  FID
	AFID  FID
	Uname string
	Aname string
}

type TclunkPkt 

type TclunkPkt struct {
	OFID FID
}

type TcreatePkt 

type TcreatePkt struct {
	OFID       FID
	Name       string
	CreatePerm Perm
	Omode      Mode
}

type TflushPkt 

type TflushPkt struct {
	OTag Tag
}

type TopenPkt 

type TopenPkt struct {
	OFID  FID
	Omode Mode
}

type Tracer 

type Tracer func(string, ...interface{})

type TreadPkt 

type TreadPkt struct {
	OFID FID
	Off  Offset
	Len  Count
}

type TremovePkt 

type TremovePkt struct {
	OFID FID
}

type TstatPkt 

type TstatPkt struct {
	OFID FID
}

type TversionPkt 

type TversionPkt struct {
	TMsize   MaxSize
	TVersion string
}

type TwalkPkt 

type TwalkPkt struct {
	SFID   FID
	NewFID FID
	Paths  []string
}

type TwritePkt 

type TwritePkt struct {
	OFID FID
	Off  Offset
	Data []byte
}

type TwstatPkt 

type TwstatPkt struct {
	OFID FID
	B    []DataCnt16
}

Source Files

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