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tds.go
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package mssql
import (
"context"
"crypto/tls"
"encoding/binary"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"sort"
"strings"
"time"
"unicode/utf16"
"unicode/utf8"
"github.com/microsoft/go-mssqldb/aecmk"
"github.com/microsoft/go-mssqldb/integratedauth"
"github.com/microsoft/go-mssqldb/msdsn"
)
func parseDAC(msg []byte, instance string) msdsn.BrowserData {
results := msdsn.BrowserData{}
if len(msg) == 6 && msg[0] == 5 {
results[strings.ToUpper(instance)]["tcp"] = fmt.Sprint(binary.LittleEndian.Uint16(msg[5:]))
}
return results
}
func parseInstances(msg []byte) msdsn.BrowserData {
results := msdsn.BrowserData{}
if len(msg) > 3 && msg[0] == 5 {
out_s := string(msg[3:])
tokens := strings.Split(out_s, ";")
instdict := map[string]string{}
got_name := false
var name string
for _, token := range tokens {
if got_name {
instdict[name] = token
got_name = false
} else {
name = token
if len(name) == 0 {
if len(instdict) == 0 {
break
}
results[strings.ToUpper(instdict["InstanceName"])] = instdict
instdict = map[string]string{}
continue
}
got_name = true
}
}
}
return results
}
func getInstances(ctx context.Context, d Dialer, address string, browserMsg msdsn.BrowserMsg, instance string) (msdsn.BrowserData, error) {
emptyInstances := msdsn.BrowserData{}
var bmsg []byte
var resp []byte
if browserMsg == msdsn.BrowserDAC {
bmsg = make([]byte, 3+len(instance))
bmsg[0] = byte(msdsn.BrowserDAC)
bmsg[1] = 1
_ = copy(bmsg[3:], instance)
resp = make([]byte, 6)
} else { // default to AllInstances
bmsg = []byte{byte(msdsn.BrowserAllInstances)}
resp = make([]byte, 16*1024-1)
}
conn, err := d.DialContext(ctx, "udp", net.JoinHostPort(address, "1434"))
if err != nil {
return emptyInstances, err
}
defer conn.Close()
deadline, _ := ctx.Deadline()
conn.SetDeadline(deadline)
_, err = conn.Write(bmsg)
if err != nil {
return emptyInstances, err
}
read, err := conn.Read(resp)
if err != nil {
return emptyInstances, err
}
if browserMsg == msdsn.BrowserDAC {
return parseDAC(resp[:read], instance), nil
}
return parseInstances(resp[:read]), nil
}
// tds versions
const (
verTDS70 = 0x70000000
verTDS71 = 0x71000000
verTDS71rev1 = 0x71000001
verTDS72 = 0x72090002
verTDS73A = 0x730A0003
verTDS73 = verTDS73A
verTDS73B = 0x730B0003
verTDS74 = 0x74000004
verTDS80 = 0x08000000
)
// packet types
// https://msdn.microsoft.com/en-us/library/dd304214.aspx
const (
packSQLBatch packetType = 1
packRPCRequest packetType = 3
packReply packetType = 4
// 2.2.1.7 Attention: https://msdn.microsoft.com/en-us/library/dd341449.aspx
// 4.19.2 Out-of-Band Attention Signal: https://msdn.microsoft.com/en-us/library/dd305167.aspx
packAttention packetType = 6
packBulkLoadBCP packetType = 7
packFedAuthToken packetType = 8
packTransMgrReq packetType = 14
packNormal packetType = 15
packLogin7 packetType = 16
packSSPIMessage packetType = 17
packPrelogin packetType = 18
)
// prelogin fields
// http://msdn.microsoft.com/en-us/library/dd357559.aspx
const (
preloginVERSION = 0
preloginENCRYPTION = 1
preloginINSTOPT = 2
preloginTHREADID = 3
preloginMARS = 4
preloginTRACEID = 5
preloginFEDAUTHREQUIRED = 6
preloginNONCEOPT = 7
preloginTERMINATOR = 0xff
)
const (
encryptOff = 0 // Encryption is available but off.
encryptOn = 1 // Encryption is available and on.
encryptNotSup = 2 // Encryption is not available.
encryptReq = 3 // Encryption is required.
encryptStrict = 4
)
const (
featExtSESSIONRECOVERY byte = 0x01
featExtFEDAUTH byte = 0x02
featExtCOLUMNENCRYPTION byte = 0x04
featExtGLOBALTRANSACTIONS byte = 0x05
featExtAZURESQLSUPPORT byte = 0x08
featExtDATACLASSIFICATION byte = 0x09
featExtUTF8SUPPORT byte = 0x0A
featExtTERMINATOR byte = 0xFF
)
type tdsSession struct {
buf *tdsBuffer
loginAck loginAckStruct
database string
partner string
columns []columnStruct
tranid uint64
logFlags uint64
logger ContextLogger
routedServer string
routedPort uint16
alwaysEncrypted bool
aeSettings *alwaysEncryptedSettings
connid UniqueIdentifier
activityid UniqueIdentifier
encoding msdsn.EncodeParameters
}
type alwaysEncryptedSettings struct {
enclaveType string
keyProviders aecmk.ColumnEncryptionKeyProviderMap
}
const (
// Default packet size for a TDS buffer.
defaultPacketSize = 4096
// Default port if no port given.
defaultServerPort = 1433
)
type columnStruct struct {
UserType uint32
Flags uint16
ColName string
ti typeInfo
cryptoMeta *cryptoMetadata
}
func (c columnStruct) isEncrypted() bool {
return isEncryptedFlag(c.Flags)
}
func isEncryptedFlag(flags uint16) bool {
return colFlagEncrypted == (flags & colFlagEncrypted)
}
func (c columnStruct) originalTypeInfo() typeInfo {
if c.isEncrypted() {
return c.cryptoMeta.typeInfo
}
return c.ti
}
type keySlice []uint8
func (p keySlice) Len() int { return len(p) }
func (p keySlice) Less(i, j int) bool { return p[i] < p[j] }
func (p keySlice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
type preloginOption struct {
token byte
offset uint16
length uint16
}
var preloginOptionSize = binary.Size(preloginOption{})
// http://msdn.microsoft.com/en-us/library/dd357559.aspx
func writePrelogin(packetType packetType, w *tdsBuffer, fields map[uint8][]byte) error {
var err error
w.BeginPacket(packetType, false)
offset := uint16(5*len(fields) + 1)
keys := make(keySlice, 0, len(fields))
for k := range fields {
keys = append(keys, k)
}
sort.Sort(keys)
// writing header
for _, k := range keys {
err = w.WriteByte(k)
if err != nil {
return err
}
err = binary.Write(w, binary.BigEndian, offset)
if err != nil {
return err
}
v := fields[k]
size := uint16(len(v))
err = binary.Write(w, binary.BigEndian, size)
if err != nil {
return err
}
offset += size
}
err = w.WriteByte(preloginTERMINATOR)
if err != nil {
return err
}
// writing values
for _, k := range keys {
v := fields[k]
written, err := w.Write(v)
if err != nil {
return err
}
if written != len(v) {
return errors.New("Write method didn't write the whole value")
}
}
return w.FinishPacket()
}
func readPrelogin(r *tdsBuffer) (map[uint8][]byte, error) {
packet_type, err := r.BeginRead()
if err != nil {
return nil, err
}
struct_buf, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
if packet_type != packReply {
return nil, errors.New("invalid respones, expected packet type 4, PRELOGIN RESPONSE")
}
if len(struct_buf) == 0 {
return nil, errors.New("invalid empty PRELOGIN response, it must contain at least one byte")
}
offset := 0
results := map[uint8][]byte{}
for {
// read prelogin option
plOption, err := readPreloginOption(struct_buf, offset)
if err != nil {
return nil, err
}
if plOption.token == preloginTERMINATOR {
break
}
// TRACEID data is not returned from the server
if plOption.token != preloginTRACEID {
// read prelogin option data
value, err := readPreloginOptionData(plOption, struct_buf)
if err != nil {
return nil, err
}
results[plOption.token] = value
}
offset += preloginOptionSize
}
return results, nil
}
func readPreloginOption(buffer []byte, offset int) (*preloginOption, error) {
buffer_length := len(buffer)
// check if prelogin option record exists in buffer
if offset >= buffer_length {
return nil, fmt.Errorf("invalid buffer, invalid prelogin option")
}
rec_type := buffer[offset]
if rec_type == preloginTERMINATOR {
return &preloginOption{token: rec_type}, nil
}
// check if prelogin option exists in buffer
if offset+preloginOptionSize >= buffer_length {
return nil, fmt.Errorf("invalid buffer, invalid prelogin option")
}
plOption := &preloginOption{
token: rec_type,
offset: binary.BigEndian.Uint16(buffer[offset+1:]),
length: binary.BigEndian.Uint16(buffer[offset+3:]),
}
return plOption, nil
}
func readPreloginOptionData(plOption *preloginOption, buffer []byte) ([]byte, error) {
buffer_length := len(buffer)
// check if prelogin option data exists in buffer
if plOption == nil || int(plOption.length+plOption.offset) > buffer_length ||
int(plOption.offset) >= buffer_length {
return nil, fmt.Errorf("invalid buffer, invalid prelogin option")
}
if plOption.token == preloginTERMINATOR {
return nil, fmt.Errorf("cannot read data for prelogin terminator record")
}
value := buffer[plOption.offset : plOption.length+plOption.offset]
return value, nil
}
// OptionFlags1
// http://msdn.microsoft.com/en-us/library/dd304019.aspx
const (
fUseDB = 0x20
fSetLang = 0x80
)
// OptionFlags2
// http://msdn.microsoft.com/en-us/library/dd304019.aspx
const (
fLanguageFatal = 1
fODBC = 2
fTransBoundary = 4
fCacheConnect = 8
fIntSecurity = 0x80
)
// OptionFlags3
// http://msdn.microsoft.com/en-us/library/dd304019.aspx
const (
fChangePassword = 1
fSendYukonBinaryXML = 2
fUserInstance = 4
fUnknownCollationHandling = 8
fExtension = 0x10
)
// TypeFlags
const (
// 4 bits for fSQLType
// 1 bit for fOLEDB
fReadOnlyIntent = 32
)
type login struct {
TDSVersion uint32
PacketSize uint32
ClientProgVer uint32
ClientPID uint32
ConnectionID uint32
OptionFlags1 uint8
OptionFlags2 uint8
TypeFlags uint8
OptionFlags3 uint8
ClientTimeZone int32
ClientLCID uint32
HostName string
UserName string
Password string
AppName string
ServerName string
CtlIntName string
Language string
Database string
ClientID [6]byte
SSPI []byte
AtchDBFile string
ChangePassword string
FeatureExt featureExts
}
type featureExts struct {
features map[byte]featureExt
}
type featureExt interface {
featureID() byte
toBytes() []byte
}
func (e *featureExts) Add(f featureExt) error {
if f == nil {
return nil
}
id := f.featureID()
if _, exists := e.features[id]; exists {
f := "login error: Feature with ID '%v' is already present in FeatureExt block"
return fmt.Errorf(f, id)
}
if e.features == nil {
e.features = make(map[byte]featureExt)
}
e.features[id] = f
return nil
}
func (e featureExts) toBytes() []byte {
if len(e.features) == 0 {
return nil
}
var d []byte
for featureID, f := range e.features {
featureData := f.toBytes()
hdr := make([]byte, 5)
hdr[0] = featureID // FedAuth feature extension BYTE
binary.LittleEndian.PutUint32(hdr[1:], uint32(len(featureData))) // FeatureDataLen DWORD
d = append(d, hdr...)
d = append(d, featureData...) // FeatureData *BYTE
}
if d != nil {
d = append(d, 0xff) // Terminator
}
return d
}
// featureExtFedAuth tracks federated authentication state before and during login
type featureExtFedAuth struct {
// FedAuthLibrary is populated by the federated authentication provider.
FedAuthLibrary int
// ADALWorkflow is populated by the federated authentication provider.
ADALWorkflow byte
// FedAuthEcho is populated from the prelogin response
FedAuthEcho bool
// FedAuthToken is populated during login with the value from the provider.
FedAuthToken string
// Nonce is populated during login with the value from the provider.
Nonce []byte
// Signature is populated during login with the value from the server.
Signature []byte
}
func (e *featureExtFedAuth) featureID() byte {
return featExtFEDAUTH
}
func (e *featureExtFedAuth) toBytes() []byte {
if e == nil {
return nil
}
options := byte(e.FedAuthLibrary) << 1
if e.FedAuthEcho {
options |= 1 // fFedAuthEcho
}
// Feature extension format depends on the federated auth library.
// Options are described at
// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-tds/773a62b6-ee89-4c02-9e5e-344882630aac
var d []byte
switch e.FedAuthLibrary {
case FedAuthLibrarySecurityToken:
d = make([]byte, 5)
d[0] = options
// looks like string in
// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-tds/f88b63bb-b479-49e1-a87b-deda521da508
tokenBytes := str2ucs2(e.FedAuthToken)
binary.LittleEndian.PutUint32(d[1:], uint32(len(tokenBytes))) // Should be a signed int32, but since the length is relatively small, this should work
d = append(d, tokenBytes...)
if len(e.Nonce) == 32 {
d = append(d, e.Nonce...)
}
case FedAuthLibraryADAL:
d = []byte{options, e.ADALWorkflow}
}
return d
}
type loginHeader struct {
Length uint32
TDSVersion uint32
PacketSize uint32
ClientProgVer uint32
ClientPID uint32
ConnectionID uint32
OptionFlags1 uint8
OptionFlags2 uint8
TypeFlags uint8
OptionFlags3 uint8
ClientTimeZone int32
ClientLCID uint32
HostNameOffset uint16
HostNameLength uint16
UserNameOffset uint16
UserNameLength uint16
PasswordOffset uint16
PasswordLength uint16
AppNameOffset uint16
AppNameLength uint16
ServerNameOffset uint16
ServerNameLength uint16
ExtensionOffset uint16
ExtensionLength uint16
CtlIntNameOffset uint16
CtlIntNameLength uint16
LanguageOffset uint16
LanguageLength uint16
DatabaseOffset uint16
DatabaseLength uint16
ClientID [6]byte
SSPIOffset uint16
SSPILength uint16
AtchDBFileOffset uint16
AtchDBFileLength uint16
ChangePasswordOffset uint16
ChangePasswordLength uint16
SSPILongLength uint32
}
// convert Go string to UTF-16 encoded []byte (littleEndian)
// done manually rather than using bytes and binary packages
// for performance reasons
func str2ucs2(s string) []byte {
res := utf16.Encode([]rune(s))
ucs2 := make([]byte, 2*len(res))
for i := 0; i < len(res); i++ {
ucs2[2*i] = byte(res[i])
ucs2[2*i+1] = byte(res[i] >> 8)
}
return ucs2
}
const (
mask64 uint64 = 0xFF80FF80FF80FF80
mask32 uint32 = 0xFF80FF80
mask16 uint16 = 0xFF80
)
func manglePassword(password string) []byte {
var ucs2password []byte = str2ucs2(password)
for i, ch := range ucs2password {
ucs2password[i] = ((ch<<4)&0xff | (ch >> 4)) ^ 0xA5
}
return ucs2password
}
// http://msdn.microsoft.com/en-us/library/dd304019.aspx
func sendLogin(w *tdsBuffer, login *login) error {
w.BeginPacket(packLogin7, false)
hostname := str2ucs2(login.HostName)
username := str2ucs2(login.UserName)
password := manglePassword(login.Password)
appname := str2ucs2(login.AppName)
servername := str2ucs2(login.ServerName)
ctlintname := str2ucs2(login.CtlIntName)
language := str2ucs2(login.Language)
database := str2ucs2(login.Database)
atchdbfile := str2ucs2(login.AtchDBFile)
changepassword := manglePassword(login.ChangePassword)
featureExt := login.FeatureExt.toBytes()
hdr := loginHeader{
TDSVersion: login.TDSVersion,
PacketSize: login.PacketSize,
ClientProgVer: login.ClientProgVer,
ClientPID: login.ClientPID,
ConnectionID: login.ConnectionID,
OptionFlags1: login.OptionFlags1,
OptionFlags2: login.OptionFlags2,
TypeFlags: login.TypeFlags,
OptionFlags3: login.OptionFlags3,
ClientTimeZone: login.ClientTimeZone,
ClientLCID: login.ClientLCID,
HostNameLength: uint16(utf8.RuneCountInString(login.HostName)),
UserNameLength: uint16(utf8.RuneCountInString(login.UserName)),
PasswordLength: uint16(utf8.RuneCountInString(login.Password)),
AppNameLength: uint16(utf8.RuneCountInString(login.AppName)),
ServerNameLength: uint16(utf8.RuneCountInString(login.ServerName)),
CtlIntNameLength: uint16(utf8.RuneCountInString(login.CtlIntName)),
LanguageLength: uint16(utf8.RuneCountInString(login.Language)),
DatabaseLength: uint16(utf8.RuneCountInString(login.Database)),
ClientID: login.ClientID,
SSPILength: uint16(len(login.SSPI)),
AtchDBFileLength: uint16(utf8.RuneCountInString(login.AtchDBFile)),
ChangePasswordLength: uint16(utf8.RuneCountInString(login.ChangePassword)),
}
offset := uint16(binary.Size(hdr))
hdr.HostNameOffset = offset
offset += uint16(len(hostname))
hdr.UserNameOffset = offset
offset += uint16(len(username))
hdr.PasswordOffset = offset
offset += uint16(len(password))
hdr.AppNameOffset = offset
offset += uint16(len(appname))
hdr.ServerNameOffset = offset
offset += uint16(len(servername))
hdr.CtlIntNameOffset = offset
offset += uint16(len(ctlintname))
hdr.LanguageOffset = offset
offset += uint16(len(language))
hdr.DatabaseOffset = offset
offset += uint16(len(database))
hdr.SSPIOffset = offset
offset += uint16(len(login.SSPI))
hdr.AtchDBFileOffset = offset
offset += uint16(len(atchdbfile))
hdr.ChangePasswordOffset = offset
offset += uint16(len(changepassword))
featureExtOffset := uint32(0)
featureExtLen := len(featureExt)
if featureExtLen > 0 {
hdr.OptionFlags3 |= fExtension
hdr.ExtensionOffset = offset
hdr.ExtensionLength = 4
offset += hdr.ExtensionLength // DWORD
featureExtOffset = uint32(offset)
}
if len(changepassword) > 0 {
hdr.OptionFlags3 |= fChangePassword
}
hdr.Length = uint32(offset) + uint32(featureExtLen)
var err error
err = binary.Write(w, binary.LittleEndian, &hdr)
if err != nil {
return err
}
_, err = w.Write(hostname)
if err != nil {
return err
}
_, err = w.Write(username)
if err != nil {
return err
}
_, err = w.Write(password)
if err != nil {
return err
}
_, err = w.Write(appname)
if err != nil {
return err
}
_, err = w.Write(servername)
if err != nil {
return err
}
_, err = w.Write(ctlintname)
if err != nil {
return err
}
_, err = w.Write(language)
if err != nil {
return err
}
_, err = w.Write(database)
if err != nil {
return err
}
_, err = w.Write(login.SSPI)
if err != nil {
return err
}
_, err = w.Write(atchdbfile)
if err != nil {
return err
}
_, err = w.Write(changepassword)
if err != nil {
return err
}
if featureExtOffset > 0 {
err = binary.Write(w, binary.LittleEndian, featureExtOffset)
if err != nil {
return err
}
_, err = w.Write(featureExt)
if err != nil {
return err
}
}
return w.FinishPacket()
}
// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-tds/827d9632-2957-4d54-b9ea-384530ae79d0
func sendFedAuthInfo(w *tdsBuffer, fedAuth *featureExtFedAuth) (err error) {
fedauthtoken := str2ucs2(fedAuth.FedAuthToken)
tokenlen := len(fedauthtoken)
datalen := 4 + tokenlen + len(fedAuth.Nonce)
w.BeginPacket(packFedAuthToken, false)
err = binary.Write(w, binary.LittleEndian, uint32(datalen))
if err != nil {
return
}
err = binary.Write(w, binary.LittleEndian, uint32(tokenlen))
if err != nil {
return
}
_, err = w.Write(fedauthtoken)
if err != nil {
return
}
_, err = w.Write(fedAuth.Nonce)
if err != nil {
return
}
return w.FinishPacket()
}
func readUcs2(r io.Reader, numchars int) (res string, err error) {
buf := make([]byte, numchars*2)
_, err = io.ReadFull(r, buf)
if err != nil {
return "", err
}
return ucs22str(buf)
}
func readUsVarChar(r io.Reader) (res string, err error) {
numchars, err := readUshort(r)
if err != nil {
return
}
return readUcs2(r, int(numchars))
}
func writeUsVarChar(w io.Writer, s string) (err error) {
buf := str2ucs2(s)
var numchars int = len(buf) / 2
if numchars > 0xffff {
panic("invalid size for US_VARCHAR")
}
err = binary.Write(w, binary.LittleEndian, uint16(numchars))
if err != nil {
return
}
_, err = w.Write(buf)
return
}
func readBVarChar(r io.Reader) (string, error) {
numchars, err := readByte(r)
if err != nil {
return "", err
}
// A zero length could be returned, return an empty string
if numchars == 0 {
return "", nil
}
return readUcs2(r, int(numchars))
}
func writeBVarChar(w io.Writer, s string) (err error) {
buf := str2ucs2(s)
var numchars int = len(buf) / 2
if numchars > 0xff {
panic("invalid size for B_VARCHAR")
}
err = binary.Write(w, binary.LittleEndian, uint8(numchars))
if err != nil {
return
}
_, err = w.Write(buf)
return
}
func readBVarByte(r io.Reader) (res []byte, err error) {
length, err := readByte(r)
if err != nil {
return
}
res = make([]byte, length)
_, err = io.ReadFull(r, res)
return
}
func readUshort(r io.Reader) (res uint16, err error) {
err = binary.Read(r, binary.LittleEndian, &res)
return
}
func readByte(r io.Reader) (res byte, err error) {
var b [1]byte
_, err = r.Read(b[:])
res = b[0]
return
}
// Packet Data Stream Headers
// http://msdn.microsoft.com/en-us/library/dd304953.aspx
type headerStruct struct {
hdrtype uint16
data []byte
}
const (
dataStmHdrQueryNotif = 1 // query notifications
dataStmHdrTransDescr = 2 // MARS transaction descriptor (required)
dataStmHdrTraceActivity = 3
)
// Query Notifications Header
// http://msdn.microsoft.com/en-us/library/dd304949.aspx
type queryNotifHdr struct {
notifyId string
ssbDeployment string
notifyTimeout uint32
}
func (hdr queryNotifHdr) pack() (res []byte) {
notifyId := str2ucs2(hdr.notifyId)
ssbDeployment := str2ucs2(hdr.ssbDeployment)
res = make([]byte, 2+len(notifyId)+2+len(ssbDeployment)+4)
b := res
binary.LittleEndian.PutUint16(b, uint16(len(notifyId)))
b = b[2:]
copy(b, notifyId)
b = b[len(notifyId):]
binary.LittleEndian.PutUint16(b, uint16(len(ssbDeployment)))
b = b[2:]
copy(b, ssbDeployment)
b = b[len(ssbDeployment):]
binary.LittleEndian.PutUint32(b, hdr.notifyTimeout)
return res
}
// MARS Transaction Descriptor Header
// http://msdn.microsoft.com/en-us/library/dd340515.aspx
type transDescrHdr struct {
transDescr uint64 // transaction descriptor returned from ENVCHANGE
outstandingReqCnt uint32 // outstanding request count
}
func (hdr transDescrHdr) pack() (res []byte) {
res = make([]byte, 8+4)
binary.LittleEndian.PutUint64(res, hdr.transDescr)
binary.LittleEndian.PutUint32(res[8:], hdr.outstandingReqCnt)
return res
}
func writeAllHeaders(w io.Writer, headers []headerStruct) (err error) {
// Calculating total length.
var totallen uint32 = 4
for _, hdr := range headers {
totallen += 4 + 2 + uint32(len(hdr.data))
}
// writing
err = binary.Write(w, binary.LittleEndian, totallen)
if err != nil {
return err
}
for _, hdr := range headers {
var headerlen uint32 = 4 + 2 + uint32(len(hdr.data))
err = binary.Write(w, binary.LittleEndian, headerlen)
if err != nil {
return err
}
err = binary.Write(w, binary.LittleEndian, hdr.hdrtype)
if err != nil {
return err
}
_, err = w.Write(hdr.data)
if err != nil {
return err
}
}
return nil
}
func sendSqlBatch72(buf *tdsBuffer, sqltext string, headers []headerStruct, resetSession bool) (err error) {
buf.BeginPacket(packSQLBatch, resetSession)
if err = writeAllHeaders(buf, headers); err != nil {
return
}
_, err = buf.Write(str2ucs2(sqltext))
if err != nil {
return
}
return buf.FinishPacket()
}
// 2.2.1.7 Attention: https://msdn.microsoft.com/en-us/library/dd341449.aspx
// 4.19.2 Out-of-Band Attention Signal: https://msdn.microsoft.com/en-us/library/dd305167.aspx
func sendAttention(buf *tdsBuffer) error {
buf.BeginPacket(packAttention, false)
return buf.FinishPacket()
}
// Makes an attempt to connect with each available protocol, in order, until one succeeds or the timeout elapses
func dialConnection(ctx context.Context, c *Connector, p *msdsn.Config, logger ContextLogger) (conn net.Conn, err error) {
var instances msdsn.BrowserData
for _, protocol := range p.Protocols {
dialer := msdsn.ProtocolDialers[protocol]
if dialer.CallBrowser(p) {
if instances == nil {
d := c.getDialer(p)
instances, err = getInstances(ctx, d, p.Host, p.BrowserMessage, p.Instance)
if err != nil && logger != nil && uint64(p.LogFlags)&logErrors != 0 {
e := fmt.Sprintf("unable to get instances from Sql Server Browser on host %v: %v", p.Host, err.Error())
logger.Log(ctx, msdsn.Log(logErrors), e)
}
}
err = dialer.ParseBrowserData(instances, p)
if err != nil {
if logger != nil && uint64(p.LogFlags)&logErrors != 0 {
logger.Log(ctx, msdsn.Log(logErrors), "Skipping protocol "+protocol+". Error:"+err.Error())
}
continue
}
}
sqlDialer, ok := dialer.(MssqlProtocolDialer)
if logger != nil && uint64(p.LogFlags)&logDebug != 0 {
logger.Log(ctx, msdsn.LogDebug, "Dialing with protocol "+protocol)
}
if !ok {
conn, err = dialer.DialConnection(ctx, p)
} else {
conn, err = sqlDialer.DialSqlConnection(ctx, c, p)
}
if err != nil && logger != nil && uint64(p.LogFlags)&logErrors != 0 {
logger.Log(ctx, msdsn.LogErrors, "Unable to connect with protocol "+protocol+":"+err.Error())
}
if conn != nil {
if logger != nil && uint64(p.LogFlags)&logDebug != 0 {
logger.Log(ctx, msdsn.LogDebug, "Returning connection from protocol "+protocol)
}
return
}
}
return
}