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gitea/vendor/github.com/denisenkom/go-mssqldb/token.go

561 lines
13 KiB

package mssql
import (
"encoding/binary"
"io"
"strconv"
"strings"
)
// token ids
const (
tokenReturnStatus = 121 // 0x79
tokenColMetadata = 129 // 0x81
tokenOrder = 169 // 0xA9
tokenError = 170 // 0xAA
tokenInfo = 171 // 0xAB
tokenLoginAck = 173 // 0xad
tokenRow = 209 // 0xd1
tokenNbcRow = 210 // 0xd2
tokenEnvChange = 227 // 0xE3
tokenSSPI = 237 // 0xED
tokenDone = 253 // 0xFD
tokenDoneProc = 254
tokenDoneInProc = 255
)
// done flags
const (
doneFinal = 0
doneMore = 1
doneError = 2
doneInxact = 4
doneCount = 0x10
doneAttn = 0x20
doneSrvError = 0x100
)
// ENVCHANGE types
// http://msdn.microsoft.com/en-us/library/dd303449.aspx
const (
envTypDatabase = 1
envTypLanguage = 2
envTypCharset = 3
envTypPacketSize = 4
envSortId = 5
envSortFlags = 6
envSqlCollation = 7
envTypBeginTran = 8
envTypCommitTran = 9
envTypRollbackTran = 10
envEnlistDTC = 11
envDefectTran = 12
envDatabaseMirrorPartner = 13
envPromoteTran = 15
envTranMgrAddr = 16
envTranEnded = 17
envResetConnAck = 18
envStartedInstanceName = 19
envRouting = 20
)
// interface for all tokens
type tokenStruct interface{}
type orderStruct struct {
ColIds []uint16
}
type doneStruct struct {
Status uint16
CurCmd uint16
RowCount uint64
}
type doneInProcStruct doneStruct
var doneFlags2str = map[uint16]string{
doneFinal: "final",
doneMore: "more",
doneError: "error",
doneInxact: "inxact",
doneCount: "count",
doneAttn: "attn",
doneSrvError: "srverror",
}
func doneFlags2Str(flags uint16) string {
strs := make([]string, 0, len(doneFlags2str))
for flag, tag := range doneFlags2str {
if flags&flag != 0 {
strs = append(strs, tag)
}
}
return strings.Join(strs, "|")
}
// ENVCHANGE stream
// http://msdn.microsoft.com/en-us/library/dd303449.aspx
func processEnvChg(sess *tdsSession) {
size := sess.buf.uint16()
r := &io.LimitedReader{R: sess.buf, N: int64(size)}
for {
var err error
var envtype uint8
err = binary.Read(r, binary.LittleEndian, &envtype)
if err == io.EOF {
return
}
if err != nil {
badStreamPanic(err)
}
switch envtype {
case envTypDatabase:
sess.database, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
case envTypLanguage:
//currently ignored
// old value
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
// new value
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
case envTypCharset:
//currently ignored
// old value
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
// new value
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
case envTypPacketSize:
packetsize, err := readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
packetsizei, err := strconv.Atoi(packetsize)
if err != nil {
badStreamPanicf("Invalid Packet size value returned from server (%s): %s", packetsize, err.Error())
}
if len(sess.buf.buf) != packetsizei {
newbuf := make([]byte, packetsizei)
copy(newbuf, sess.buf.buf)
sess.buf.buf = newbuf
}
case envSortId:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// new value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envSortFlags:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// new value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envSqlCollation:
// currently ignored
// old value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// new value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envTypBeginTran:
tranid, err := readBVarByte(r)
if len(tranid) != 8 {
badStreamPanicf("invalid size of transaction identifier: %d", len(tranid))
}
sess.tranid = binary.LittleEndian.Uint64(tranid)
if err != nil {
badStreamPanic(err)
}
if sess.logFlags&logTransaction != 0 {
sess.log.Printf("BEGIN TRANSACTION %x\n", sess.tranid)
}
_, err = readBVarByte(r)
if err != nil {
badStreamPanic(err)
}
case envTypCommitTran, envTypRollbackTran:
_, err = readBVarByte(r)
if err != nil {
badStreamPanic(err)
}
_, err = readBVarByte(r)
if err != nil {
badStreamPanic(err)
}
if sess.logFlags&logTransaction != 0 {
if envtype == envTypCommitTran {
sess.log.Printf("COMMIT TRANSACTION %x\n", sess.tranid)
} else {
sess.log.Printf("ROLLBACK TRANSACTION %x\n", sess.tranid)
}
}
sess.tranid = 0
case envEnlistDTC:
// currently ignored
// old value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// new value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envDefectTran:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// new value
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envDatabaseMirrorPartner:
sess.partner, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
_, err = readBVarChar(r)
if err != nil {
badStreamPanic(err)
}
case envPromoteTran:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// dtc token
// spec says it should be L_VARBYTE, so this code might be wrong
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envTranMgrAddr:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// XACT_MANAGER_ADDRESS = B_VARBYTE
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envTranEnded:
// currently ignored
// old value, B_VARBYTE
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envResetConnAck:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envStartedInstanceName:
// currently ignored
// old value, should be 0
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
// instance name
if _, err = readBVarChar(r); err != nil {
badStreamPanic(err)
}
case envRouting:
// RoutingData message is:
// ValueLength USHORT
// Protocol (TCP = 0) BYTE
// ProtocolProperty (new port) USHORT
// AlternateServer US_VARCHAR
_, err := readUshort(r)
if err != nil {
badStreamPanic(err)
}
protocol, err := readByte(r)
if err != nil || protocol != 0 {
badStreamPanic(err)
}
newPort, err := readUshort(r)
if err != nil {
badStreamPanic(err)
}
newServer, err := readUsVarChar(r)
if err != nil {
badStreamPanic(err)
}
// consume the OLDVALUE = %x00 %x00
_, err = readUshort(r)
if err != nil {
badStreamPanic(err)
}
sess.routedServer = newServer
sess.routedPort = newPort
default:
// ignore rest of records because we don't know how to skip those
sess.log.Printf("WARN: Unknown ENVCHANGE record detected with type id = %d\n", envtype)
break
}
}
}
type returnStatus int32
// http://msdn.microsoft.com/en-us/library/dd358180.aspx
func parseReturnStatus(r *tdsBuffer) returnStatus {
return returnStatus(r.int32())
}
func parseOrder(r *tdsBuffer) (res orderStruct) {
len := int(r.uint16())
res.ColIds = make([]uint16, len/2)
for i := 0; i < len/2; i++ {
res.ColIds[i] = r.uint16()
}
return res
}
func parseDone(r *tdsBuffer) (res doneStruct) {
res.Status = r.uint16()
res.CurCmd = r.uint16()
res.RowCount = r.uint64()
return res
}
func parseDoneInProc(r *tdsBuffer) (res doneInProcStruct) {
res.Status = r.uint16()
res.CurCmd = r.uint16()
res.RowCount = r.uint64()
return res
}
type sspiMsg []byte
func parseSSPIMsg(r *tdsBuffer) sspiMsg {
size := r.uint16()
buf := make([]byte, size)
r.ReadFull(buf)
return sspiMsg(buf)
}
type loginAckStruct struct {
Interface uint8
TDSVersion uint32
ProgName string
ProgVer uint32
}
func parseLoginAck(r *tdsBuffer) loginAckStruct {
size := r.uint16()
buf := make([]byte, size)
r.ReadFull(buf)
var res loginAckStruct
res.Interface = buf[0]
res.TDSVersion = binary.BigEndian.Uint32(buf[1:])
prognamelen := buf[1+4]
var err error
if res.ProgName, err = ucs22str(buf[1+4+1 : 1+4+1+prognamelen*2]); err != nil {
badStreamPanic(err)
}
res.ProgVer = binary.BigEndian.Uint32(buf[size-4:])
return res
}
// http://msdn.microsoft.com/en-us/library/dd357363.aspx
func parseColMetadata72(r *tdsBuffer) (columns []columnStruct) {
count := r.uint16()
if count == 0xffff {
// no metadata is sent
return nil
}
columns = make([]columnStruct, count)
for i := range columns {
column := &columns[i]
column.UserType = r.uint32()
column.Flags = r.uint16()
// parsing TYPE_INFO structure
column.ti = readTypeInfo(r)
column.ColName = r.BVarChar()
}
return columns
}
// http://msdn.microsoft.com/en-us/library/dd357254.aspx
func parseRow(r *tdsBuffer, columns []columnStruct, row []interface{}) {
for i, column := range columns {
row[i] = column.ti.Reader(&column.ti, r)
}
}
// http://msdn.microsoft.com/en-us/library/dd304783.aspx
func parseNbcRow(r *tdsBuffer, columns []columnStruct, row []interface{}) {
bitlen := (len(columns) + 7) / 8
pres := make([]byte, bitlen)
r.ReadFull(pres)
for i, col := range columns {
if pres[i/8]&(1<<(uint(i)%8)) != 0 {
row[i] = nil
continue
}
row[i] = col.ti.Reader(&col.ti, r)
}
}
// http://msdn.microsoft.com/en-us/library/dd304156.aspx
func parseError72(r *tdsBuffer) (res Error) {
length := r.uint16()
_ = length // ignore length
res.Number = r.int32()
res.State = r.byte()
res.Class = r.byte()
res.Message = r.UsVarChar()
res.ServerName = r.BVarChar()
res.ProcName = r.BVarChar()
res.LineNo = r.int32()
return
}
// http://msdn.microsoft.com/en-us/library/dd304156.aspx
func parseInfo(r *tdsBuffer) (res Error) {
length := r.uint16()
_ = length // ignore length
res.Number = r.int32()
res.State = r.byte()
res.Class = r.byte()
res.Message = r.UsVarChar()
res.ServerName = r.BVarChar()
res.ProcName = r.BVarChar()
res.LineNo = r.int32()
return
}
func processResponse(sess *tdsSession, ch chan tokenStruct) {
defer func() {
if err := recover(); err != nil {
ch <- err
}
close(ch)
}()
packet_type, err := sess.buf.BeginRead()
if err != nil {
ch <- err
return
}
if packet_type != packReply {
badStreamPanicf("invalid response packet type, expected REPLY, actual: %d", packet_type)
}
var columns []columnStruct
var lastError Error
var failed bool
for {
token := sess.buf.byte()
switch token {
case tokenSSPI:
ch <- parseSSPIMsg(sess.buf)
return
case tokenReturnStatus:
returnStatus := parseReturnStatus(sess.buf)
ch <- returnStatus
case tokenLoginAck:
loginAck := parseLoginAck(sess.buf)
ch <- loginAck
case tokenOrder:
order := parseOrder(sess.buf)
ch <- order
case tokenDoneInProc:
done := parseDoneInProc(sess.buf)
if sess.logFlags&logRows != 0 && done.Status&doneCount != 0 {
sess.log.Printf("(%d row(s) affected)\n", done.RowCount)
}
ch <- done
case tokenDone, tokenDoneProc:
done := parseDone(sess.buf)
if sess.logFlags&logRows != 0 && done.Status&doneCount != 0 {
sess.log.Printf("(%d row(s) affected)\n", done.RowCount)
}
if done.Status&doneError != 0 || failed {
ch <- lastError
return
}
if done.Status&doneSrvError != 0 {
lastError.Message = "Server Error"
ch <- lastError
return
}
ch <- done
if done.Status&doneMore == 0 {
return
}
case tokenColMetadata:
columns = parseColMetadata72(sess.buf)
ch <- columns
case tokenRow:
row := make([]interface{}, len(columns))
parseRow(sess.buf, columns, row)
ch <- row
case tokenNbcRow:
row := make([]interface{}, len(columns))
parseNbcRow(sess.buf, columns, row)
ch <- row
case tokenEnvChange:
processEnvChg(sess)
case tokenError:
lastError = parseError72(sess.buf)
failed = true
if sess.logFlags&logErrors != 0 {
sess.log.Println(lastError.Message)
}
case tokenInfo:
info := parseInfo(sess.buf)
if sess.logFlags&logMessages != 0 {
sess.log.Println(info.Message)
}
default:
badStreamPanicf("Unknown token type: %d", token)
}
}
}