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