mirror of
https://github.com/go-gitea/gitea
synced 2024-11-18 16:14:26 +00:00
78e5317242
* New driver does not tolerate USE - handle this by closing db and reopening db in the new dbname
1376 lines
34 KiB
Go
1376 lines
34 KiB
Go
package mssql
|
|
|
|
import (
|
|
"context"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"net"
|
|
"net/url"
|
|
"os"
|
|
"sort"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
"unicode"
|
|
"unicode/utf16"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
func parseInstances(msg []byte) map[string]map[string]string {
|
|
results := map[string]map[string]string{}
|
|
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) (map[string]map[string]string, error) {
|
|
maxTime := 5 * time.Second
|
|
ctx, cancel := context.WithTimeout(ctx, maxTime)
|
|
defer cancel()
|
|
conn, err := d.DialContext(ctx, "udp", address+":1434")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer conn.Close()
|
|
conn.SetDeadline(time.Now().Add(maxTime))
|
|
_, err = conn.Write([]byte{3})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var resp = make([]byte, 16*1024-1)
|
|
read, err := conn.Read(resp)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return parseInstances(resp[:read]), nil
|
|
}
|
|
|
|
// tds versions
|
|
const (
|
|
verTDS70 = 0x70000000
|
|
verTDS71 = 0x71000000
|
|
verTDS71rev1 = 0x71000001
|
|
verTDS72 = 0x72090002
|
|
verTDS73A = 0x730A0003
|
|
verTDS73 = verTDS73A
|
|
verTDS73B = 0x730B0003
|
|
verTDS74 = 0x74000004
|
|
)
|
|
|
|
// packet types
|
|
// https://msdn.microsoft.com/en-us/library/dd304214.aspx
|
|
const (
|
|
packSQLBatch packetType = 1
|
|
packRPCRequest = 3
|
|
packReply = 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 = 6
|
|
|
|
packBulkLoadBCP = 7
|
|
packTransMgrReq = 14
|
|
packNormal = 15
|
|
packLogin7 = 16
|
|
packSSPIMessage = 17
|
|
packPrelogin = 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
|
|
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.
|
|
)
|
|
|
|
type tdsSession struct {
|
|
buf *tdsBuffer
|
|
loginAck loginAckStruct
|
|
database string
|
|
partner string
|
|
columns []columnStruct
|
|
tranid uint64
|
|
logFlags uint64
|
|
log optionalLogger
|
|
routedServer string
|
|
routedPort uint16
|
|
}
|
|
|
|
const (
|
|
logErrors = 1
|
|
logMessages = 2
|
|
logRows = 4
|
|
logSQL = 8
|
|
logParams = 16
|
|
logTransaction = 32
|
|
logDebug = 64
|
|
)
|
|
|
|
type columnStruct struct {
|
|
UserType uint32
|
|
Flags uint16
|
|
ColName string
|
|
ti typeInfo
|
|
}
|
|
|
|
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] }
|
|
|
|
// http://msdn.microsoft.com/en-us/library/dd357559.aspx
|
|
func writePrelogin(w *tdsBuffer, fields map[uint8][]byte) error {
|
|
var err error
|
|
|
|
w.BeginPacket(packPrelogin, 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 != 4 {
|
|
return nil, errors.New("Invalid respones, expected packet type 4, PRELOGIN RESPONSE")
|
|
}
|
|
offset := 0
|
|
results := map[uint8][]byte{}
|
|
for true {
|
|
rec_type := struct_buf[offset]
|
|
if rec_type == preloginTERMINATOR {
|
|
break
|
|
}
|
|
|
|
rec_offset := binary.BigEndian.Uint16(struct_buf[offset+1:])
|
|
rec_len := binary.BigEndian.Uint16(struct_buf[offset+3:])
|
|
value := struct_buf[rec_offset : rec_offset+rec_len]
|
|
results[rec_type] = value
|
|
offset += 5
|
|
}
|
|
return results, nil
|
|
}
|
|
|
|
// OptionFlags2
|
|
// http://msdn.microsoft.com/en-us/library/dd304019.aspx
|
|
const (
|
|
fLanguageFatal = 1
|
|
fODBC = 2
|
|
fTransBoundary = 4
|
|
fCacheConnect = 8
|
|
fIntSecurity = 0x80
|
|
)
|
|
|
|
// 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
|
|
}
|
|
|
|
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
|
|
ExtensionLenght 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
|
|
}
|
|
|
|
func ucs22str(s []byte) (string, error) {
|
|
if len(s)%2 != 0 {
|
|
return "", fmt.Errorf("Illegal UCS2 string length: %d", len(s))
|
|
}
|
|
buf := make([]uint16, len(s)/2)
|
|
for i := 0; i < len(s); i += 2 {
|
|
buf[i/2] = binary.LittleEndian.Uint16(s[i:])
|
|
}
|
|
return string(utf16.Decode(buf)), nil
|
|
}
|
|
|
|
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 := str2ucs2(login.ChangePassword)
|
|
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))
|
|
hdr.Length = uint32(offset)
|
|
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
|
|
}
|
|
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) {
|
|
var numchars uint16
|
|
err = binary.Read(r, binary.LittleEndian, &numchars)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
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) (res string, err error) {
|
|
var numchars uint8
|
|
err = binary.Read(r, binary.LittleEndian, &numchars)
|
|
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) {
|
|
var length uint8
|
|
err = binary.Read(r, binary.LittleEndian, &length)
|
|
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()
|
|
}
|
|
|
|
type connectParams struct {
|
|
logFlags uint64
|
|
port uint64
|
|
host string
|
|
instance string
|
|
database string
|
|
user string
|
|
password string
|
|
dial_timeout time.Duration
|
|
conn_timeout time.Duration
|
|
keepAlive time.Duration
|
|
encrypt bool
|
|
disableEncryption bool
|
|
trustServerCertificate bool
|
|
certificate string
|
|
hostInCertificate string
|
|
hostInCertificateProvided bool
|
|
serverSPN string
|
|
workstation string
|
|
appname string
|
|
typeFlags uint8
|
|
failOverPartner string
|
|
failOverPort uint64
|
|
packetSize uint16
|
|
}
|
|
|
|
func splitConnectionString(dsn string) (res map[string]string) {
|
|
res = map[string]string{}
|
|
parts := strings.Split(dsn, ";")
|
|
for _, part := range parts {
|
|
if len(part) == 0 {
|
|
continue
|
|
}
|
|
lst := strings.SplitN(part, "=", 2)
|
|
name := strings.TrimSpace(strings.ToLower(lst[0]))
|
|
if len(name) == 0 {
|
|
continue
|
|
}
|
|
var value string = ""
|
|
if len(lst) > 1 {
|
|
value = strings.TrimSpace(lst[1])
|
|
}
|
|
res[name] = value
|
|
}
|
|
return res
|
|
}
|
|
|
|
// Splits a URL in the ODBC format
|
|
func splitConnectionStringOdbc(dsn string) (map[string]string, error) {
|
|
res := map[string]string{}
|
|
|
|
type parserState int
|
|
const (
|
|
// Before the start of a key
|
|
parserStateBeforeKey parserState = iota
|
|
|
|
// Inside a key
|
|
parserStateKey
|
|
|
|
// Beginning of a value. May be bare or braced
|
|
parserStateBeginValue
|
|
|
|
// Inside a bare value
|
|
parserStateBareValue
|
|
|
|
// Inside a braced value
|
|
parserStateBracedValue
|
|
|
|
// A closing brace inside a braced value.
|
|
// May be the end of the value or an escaped closing brace, depending on the next character
|
|
parserStateBracedValueClosingBrace
|
|
|
|
// After a value. Next character should be a semicolon or whitespace.
|
|
parserStateEndValue
|
|
)
|
|
|
|
var state = parserStateBeforeKey
|
|
|
|
var key string
|
|
var value string
|
|
|
|
for i, c := range dsn {
|
|
switch state {
|
|
case parserStateBeforeKey:
|
|
switch {
|
|
case c == '=':
|
|
return res, fmt.Errorf("Unexpected character = at index %d. Expected start of key or semi-colon or whitespace.", i)
|
|
case !unicode.IsSpace(c) && c != ';':
|
|
state = parserStateKey
|
|
key += string(c)
|
|
}
|
|
|
|
case parserStateKey:
|
|
switch c {
|
|
case '=':
|
|
key = normalizeOdbcKey(key)
|
|
if len(key) == 0 {
|
|
return res, fmt.Errorf("Unexpected end of key at index %d.", i)
|
|
}
|
|
|
|
state = parserStateBeginValue
|
|
|
|
case ';':
|
|
// Key without value
|
|
key = normalizeOdbcKey(key)
|
|
if len(key) == 0 {
|
|
return res, fmt.Errorf("Unexpected end of key at index %d.", i)
|
|
}
|
|
|
|
res[key] = value
|
|
key = ""
|
|
value = ""
|
|
state = parserStateBeforeKey
|
|
|
|
default:
|
|
key += string(c)
|
|
}
|
|
|
|
case parserStateBeginValue:
|
|
switch {
|
|
case c == '{':
|
|
state = parserStateBracedValue
|
|
case c == ';':
|
|
// Empty value
|
|
res[key] = value
|
|
key = ""
|
|
state = parserStateBeforeKey
|
|
case unicode.IsSpace(c):
|
|
// Ignore whitespace
|
|
default:
|
|
state = parserStateBareValue
|
|
value += string(c)
|
|
}
|
|
|
|
case parserStateBareValue:
|
|
if c == ';' {
|
|
res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
|
|
key = ""
|
|
value = ""
|
|
state = parserStateBeforeKey
|
|
} else {
|
|
value += string(c)
|
|
}
|
|
|
|
case parserStateBracedValue:
|
|
if c == '}' {
|
|
state = parserStateBracedValueClosingBrace
|
|
} else {
|
|
value += string(c)
|
|
}
|
|
|
|
case parserStateBracedValueClosingBrace:
|
|
if c == '}' {
|
|
// Escaped closing brace
|
|
value += string(c)
|
|
state = parserStateBracedValue
|
|
continue
|
|
}
|
|
|
|
// End of braced value
|
|
res[key] = value
|
|
key = ""
|
|
value = ""
|
|
|
|
// This character is the first character past the end,
|
|
// so it needs to be parsed like the parserStateEndValue state.
|
|
state = parserStateEndValue
|
|
switch {
|
|
case c == ';':
|
|
state = parserStateBeforeKey
|
|
case unicode.IsSpace(c):
|
|
// Ignore whitespace
|
|
default:
|
|
return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
|
|
}
|
|
|
|
case parserStateEndValue:
|
|
switch {
|
|
case c == ';':
|
|
state = parserStateBeforeKey
|
|
case unicode.IsSpace(c):
|
|
// Ignore whitespace
|
|
default:
|
|
return res, fmt.Errorf("Unexpected character %c at index %d. Expected semi-colon or whitespace.", c, i)
|
|
}
|
|
}
|
|
}
|
|
|
|
switch state {
|
|
case parserStateBeforeKey: // Okay
|
|
case parserStateKey: // Unfinished key. Treat as key without value.
|
|
key = normalizeOdbcKey(key)
|
|
if len(key) == 0 {
|
|
return res, fmt.Errorf("Unexpected end of key at index %d.", len(dsn))
|
|
}
|
|
res[key] = value
|
|
case parserStateBeginValue: // Empty value
|
|
res[key] = value
|
|
case parserStateBareValue:
|
|
res[key] = strings.TrimRightFunc(value, unicode.IsSpace)
|
|
case parserStateBracedValue:
|
|
return res, fmt.Errorf("Unexpected end of braced value at index %d.", len(dsn))
|
|
case parserStateBracedValueClosingBrace: // End of braced value
|
|
res[key] = value
|
|
case parserStateEndValue: // Okay
|
|
}
|
|
|
|
return res, nil
|
|
}
|
|
|
|
// Normalizes the given string as an ODBC-format key
|
|
func normalizeOdbcKey(s string) string {
|
|
return strings.ToLower(strings.TrimRightFunc(s, unicode.IsSpace))
|
|
}
|
|
|
|
// Splits a URL of the form sqlserver://username:password@host/instance?param1=value¶m2=value
|
|
func splitConnectionStringURL(dsn string) (map[string]string, error) {
|
|
res := map[string]string{}
|
|
|
|
u, err := url.Parse(dsn)
|
|
if err != nil {
|
|
return res, err
|
|
}
|
|
|
|
if u.Scheme != "sqlserver" {
|
|
return res, fmt.Errorf("scheme %s is not recognized", u.Scheme)
|
|
}
|
|
|
|
if u.User != nil {
|
|
res["user id"] = u.User.Username()
|
|
p, exists := u.User.Password()
|
|
if exists {
|
|
res["password"] = p
|
|
}
|
|
}
|
|
|
|
host, port, err := net.SplitHostPort(u.Host)
|
|
if err != nil {
|
|
host = u.Host
|
|
}
|
|
|
|
if len(u.Path) > 0 {
|
|
res["server"] = host + "\\" + u.Path[1:]
|
|
} else {
|
|
res["server"] = host
|
|
}
|
|
|
|
if len(port) > 0 {
|
|
res["port"] = port
|
|
}
|
|
|
|
query := u.Query()
|
|
for k, v := range query {
|
|
if len(v) > 1 {
|
|
return res, fmt.Errorf("key %s provided more than once", k)
|
|
}
|
|
res[strings.ToLower(k)] = v[0]
|
|
}
|
|
|
|
return res, nil
|
|
}
|
|
|
|
func parseConnectParams(dsn string) (connectParams, error) {
|
|
var p connectParams
|
|
|
|
var params map[string]string
|
|
if strings.HasPrefix(dsn, "odbc:") {
|
|
parameters, err := splitConnectionStringOdbc(dsn[len("odbc:"):])
|
|
if err != nil {
|
|
return p, err
|
|
}
|
|
params = parameters
|
|
} else if strings.HasPrefix(dsn, "sqlserver://") {
|
|
parameters, err := splitConnectionStringURL(dsn)
|
|
if err != nil {
|
|
return p, err
|
|
}
|
|
params = parameters
|
|
} else {
|
|
params = splitConnectionString(dsn)
|
|
}
|
|
|
|
strlog, ok := params["log"]
|
|
if ok {
|
|
var err error
|
|
p.logFlags, err = strconv.ParseUint(strlog, 10, 64)
|
|
if err != nil {
|
|
return p, fmt.Errorf("Invalid log parameter '%s': %s", strlog, err.Error())
|
|
}
|
|
}
|
|
server := params["server"]
|
|
parts := strings.SplitN(server, `\`, 2)
|
|
p.host = parts[0]
|
|
if p.host == "." || strings.ToUpper(p.host) == "(LOCAL)" || p.host == "" {
|
|
p.host = "localhost"
|
|
}
|
|
if len(parts) > 1 {
|
|
p.instance = parts[1]
|
|
}
|
|
p.database = params["database"]
|
|
p.user = params["user id"]
|
|
p.password = params["password"]
|
|
|
|
p.port = 1433
|
|
strport, ok := params["port"]
|
|
if ok {
|
|
var err error
|
|
p.port, err = strconv.ParseUint(strport, 10, 16)
|
|
if err != nil {
|
|
f := "Invalid tcp port '%v': %v"
|
|
return p, fmt.Errorf(f, strport, err.Error())
|
|
}
|
|
}
|
|
|
|
// https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/configure-the-network-packet-size-server-configuration-option
|
|
// Default packet size remains at 4096 bytes
|
|
p.packetSize = 4096
|
|
strpsize, ok := params["packet size"]
|
|
if ok {
|
|
var err error
|
|
psize, err := strconv.ParseUint(strpsize, 0, 16)
|
|
if err != nil {
|
|
f := "Invalid packet size '%v': %v"
|
|
return p, fmt.Errorf(f, strpsize, err.Error())
|
|
}
|
|
|
|
// Ensure packet size falls within the TDS protocol range of 512 to 32767 bytes
|
|
// NOTE: Encrypted connections have a maximum size of 16383 bytes. If you request
|
|
// a higher packet size, the server will respond with an ENVCHANGE request to
|
|
// alter the packet size to 16383 bytes.
|
|
p.packetSize = uint16(psize)
|
|
if p.packetSize < 512 {
|
|
p.packetSize = 512
|
|
} else if p.packetSize > 32767 {
|
|
p.packetSize = 32767
|
|
}
|
|
}
|
|
|
|
// https://msdn.microsoft.com/en-us/library/dd341108.aspx
|
|
//
|
|
// Do not set a connection timeout. Use Context to manage such things.
|
|
// Default to zero, but still allow it to be set.
|
|
if strconntimeout, ok := params["connection timeout"]; ok {
|
|
timeout, err := strconv.ParseUint(strconntimeout, 10, 64)
|
|
if err != nil {
|
|
f := "Invalid connection timeout '%v': %v"
|
|
return p, fmt.Errorf(f, strconntimeout, err.Error())
|
|
}
|
|
p.conn_timeout = time.Duration(timeout) * time.Second
|
|
}
|
|
p.dial_timeout = 15 * time.Second
|
|
if strdialtimeout, ok := params["dial timeout"]; ok {
|
|
timeout, err := strconv.ParseUint(strdialtimeout, 10, 64)
|
|
if err != nil {
|
|
f := "Invalid dial timeout '%v': %v"
|
|
return p, fmt.Errorf(f, strdialtimeout, err.Error())
|
|
}
|
|
p.dial_timeout = time.Duration(timeout) * time.Second
|
|
}
|
|
|
|
// default keep alive should be 30 seconds according to spec:
|
|
// https://msdn.microsoft.com/en-us/library/dd341108.aspx
|
|
p.keepAlive = 30 * time.Second
|
|
if keepAlive, ok := params["keepalive"]; ok {
|
|
timeout, err := strconv.ParseUint(keepAlive, 10, 64)
|
|
if err != nil {
|
|
f := "Invalid keepAlive value '%s': %s"
|
|
return p, fmt.Errorf(f, keepAlive, err.Error())
|
|
}
|
|
p.keepAlive = time.Duration(timeout) * time.Second
|
|
}
|
|
encrypt, ok := params["encrypt"]
|
|
if ok {
|
|
if strings.EqualFold(encrypt, "DISABLE") {
|
|
p.disableEncryption = true
|
|
} else {
|
|
var err error
|
|
p.encrypt, err = strconv.ParseBool(encrypt)
|
|
if err != nil {
|
|
f := "Invalid encrypt '%s': %s"
|
|
return p, fmt.Errorf(f, encrypt, err.Error())
|
|
}
|
|
}
|
|
} else {
|
|
p.trustServerCertificate = true
|
|
}
|
|
trust, ok := params["trustservercertificate"]
|
|
if ok {
|
|
var err error
|
|
p.trustServerCertificate, err = strconv.ParseBool(trust)
|
|
if err != nil {
|
|
f := "Invalid trust server certificate '%s': %s"
|
|
return p, fmt.Errorf(f, trust, err.Error())
|
|
}
|
|
}
|
|
p.certificate = params["certificate"]
|
|
p.hostInCertificate, ok = params["hostnameincertificate"]
|
|
if ok {
|
|
p.hostInCertificateProvided = true
|
|
} else {
|
|
p.hostInCertificate = p.host
|
|
p.hostInCertificateProvided = false
|
|
}
|
|
|
|
serverSPN, ok := params["serverspn"]
|
|
if ok {
|
|
p.serverSPN = serverSPN
|
|
} else {
|
|
p.serverSPN = fmt.Sprintf("MSSQLSvc/%s:%d", p.host, p.port)
|
|
}
|
|
|
|
workstation, ok := params["workstation id"]
|
|
if ok {
|
|
p.workstation = workstation
|
|
} else {
|
|
workstation, err := os.Hostname()
|
|
if err == nil {
|
|
p.workstation = workstation
|
|
}
|
|
}
|
|
|
|
appname, ok := params["app name"]
|
|
if !ok {
|
|
appname = "go-mssqldb"
|
|
}
|
|
p.appname = appname
|
|
|
|
appintent, ok := params["applicationintent"]
|
|
if ok {
|
|
if appintent == "ReadOnly" {
|
|
p.typeFlags |= fReadOnlyIntent
|
|
}
|
|
}
|
|
|
|
failOverPartner, ok := params["failoverpartner"]
|
|
if ok {
|
|
p.failOverPartner = failOverPartner
|
|
}
|
|
|
|
failOverPort, ok := params["failoverport"]
|
|
if ok {
|
|
var err error
|
|
p.failOverPort, err = strconv.ParseUint(failOverPort, 0, 16)
|
|
if err != nil {
|
|
f := "Invalid tcp port '%v': %v"
|
|
return p, fmt.Errorf(f, failOverPort, err.Error())
|
|
}
|
|
}
|
|
|
|
return p, nil
|
|
}
|
|
|
|
type auth interface {
|
|
InitialBytes() ([]byte, error)
|
|
NextBytes([]byte) ([]byte, error)
|
|
Free()
|
|
}
|
|
|
|
// SQL Server AlwaysOn Availability Group Listeners are bound by DNS to a
|
|
// list of IP addresses. So if there is more than one, try them all and
|
|
// use the first one that allows a connection.
|
|
func dialConnection(ctx context.Context, c *Connector, p connectParams) (conn net.Conn, err error) {
|
|
var ips []net.IP
|
|
ips, err = net.LookupIP(p.host)
|
|
if err != nil {
|
|
ip := net.ParseIP(p.host)
|
|
if ip == nil {
|
|
return nil, err
|
|
}
|
|
ips = []net.IP{ip}
|
|
}
|
|
if len(ips) == 1 {
|
|
d := c.getDialer(&p)
|
|
addr := net.JoinHostPort(ips[0].String(), strconv.Itoa(int(p.port)))
|
|
conn, err = d.DialContext(ctx, "tcp", addr)
|
|
|
|
} else {
|
|
//Try Dials in parallel to avoid waiting for timeouts.
|
|
connChan := make(chan net.Conn, len(ips))
|
|
errChan := make(chan error, len(ips))
|
|
portStr := strconv.Itoa(int(p.port))
|
|
for _, ip := range ips {
|
|
go func(ip net.IP) {
|
|
d := c.getDialer(&p)
|
|
addr := net.JoinHostPort(ip.String(), portStr)
|
|
conn, err := d.DialContext(ctx, "tcp", addr)
|
|
if err == nil {
|
|
connChan <- conn
|
|
} else {
|
|
errChan <- err
|
|
}
|
|
}(ip)
|
|
}
|
|
// Wait for either the *first* successful connection, or all the errors
|
|
wait_loop:
|
|
for i, _ := range ips {
|
|
select {
|
|
case conn = <-connChan:
|
|
// Got a connection to use, close any others
|
|
go func(n int) {
|
|
for i := 0; i < n; i++ {
|
|
select {
|
|
case conn := <-connChan:
|
|
conn.Close()
|
|
case <-errChan:
|
|
}
|
|
}
|
|
}(len(ips) - i - 1)
|
|
// Remove any earlier errors we may have collected
|
|
err = nil
|
|
break wait_loop
|
|
case err = <-errChan:
|
|
}
|
|
}
|
|
}
|
|
// Can't do the usual err != nil check, as it is possible to have gotten an error before a successful connection
|
|
if conn == nil {
|
|
f := "Unable to open tcp connection with host '%v:%v': %v"
|
|
return nil, fmt.Errorf(f, p.host, p.port, err.Error())
|
|
}
|
|
return conn, err
|
|
}
|
|
|
|
func connect(ctx context.Context, c *Connector, log optionalLogger, p connectParams) (res *tdsSession, err error) {
|
|
dialCtx := ctx
|
|
if p.dial_timeout > 0 {
|
|
var cancel func()
|
|
dialCtx, cancel = context.WithTimeout(ctx, p.dial_timeout)
|
|
defer cancel()
|
|
}
|
|
// if instance is specified use instance resolution service
|
|
if p.instance != "" {
|
|
p.instance = strings.ToUpper(p.instance)
|
|
d := c.getDialer(&p)
|
|
instances, err := getInstances(dialCtx, d, p.host)
|
|
if err != nil {
|
|
f := "Unable to get instances from Sql Server Browser on host %v: %v"
|
|
return nil, fmt.Errorf(f, p.host, err.Error())
|
|
}
|
|
strport, ok := instances[p.instance]["tcp"]
|
|
if !ok {
|
|
f := "No instance matching '%v' returned from host '%v'"
|
|
return nil, fmt.Errorf(f, p.instance, p.host)
|
|
}
|
|
p.port, err = strconv.ParseUint(strport, 0, 16)
|
|
if err != nil {
|
|
f := "Invalid tcp port returned from Sql Server Browser '%v': %v"
|
|
return nil, fmt.Errorf(f, strport, err.Error())
|
|
}
|
|
}
|
|
|
|
initiate_connection:
|
|
conn, err := dialConnection(dialCtx, c, p)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
toconn := newTimeoutConn(conn, p.conn_timeout)
|
|
|
|
outbuf := newTdsBuffer(p.packetSize, toconn)
|
|
sess := tdsSession{
|
|
buf: outbuf,
|
|
log: log,
|
|
logFlags: p.logFlags,
|
|
}
|
|
|
|
instance_buf := []byte(p.instance)
|
|
instance_buf = append(instance_buf, 0) // zero terminate instance name
|
|
var encrypt byte
|
|
if p.disableEncryption {
|
|
encrypt = encryptNotSup
|
|
} else if p.encrypt {
|
|
encrypt = encryptOn
|
|
} else {
|
|
encrypt = encryptOff
|
|
}
|
|
fields := map[uint8][]byte{
|
|
preloginVERSION: {0, 0, 0, 0, 0, 0},
|
|
preloginENCRYPTION: {encrypt},
|
|
preloginINSTOPT: instance_buf,
|
|
preloginTHREADID: {0, 0, 0, 0},
|
|
preloginMARS: {0}, // MARS disabled
|
|
}
|
|
|
|
err = writePrelogin(outbuf, fields)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
fields, err = readPrelogin(outbuf)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
encryptBytes, ok := fields[preloginENCRYPTION]
|
|
if !ok {
|
|
return nil, fmt.Errorf("Encrypt negotiation failed")
|
|
}
|
|
encrypt = encryptBytes[0]
|
|
if p.encrypt && (encrypt == encryptNotSup || encrypt == encryptOff) {
|
|
return nil, fmt.Errorf("Server does not support encryption")
|
|
}
|
|
|
|
if encrypt != encryptNotSup {
|
|
var config tls.Config
|
|
if p.certificate != "" {
|
|
pem, err := ioutil.ReadFile(p.certificate)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("Cannot read certificate %q: %v", p.certificate, err)
|
|
}
|
|
certs := x509.NewCertPool()
|
|
certs.AppendCertsFromPEM(pem)
|
|
config.RootCAs = certs
|
|
}
|
|
if p.trustServerCertificate {
|
|
config.InsecureSkipVerify = true
|
|
}
|
|
config.ServerName = p.hostInCertificate
|
|
// fix for https://github.com/denisenkom/go-mssqldb/issues/166
|
|
// Go implementation of TLS payload size heuristic algorithm splits single TDS package to multiple TCP segments,
|
|
// while SQL Server seems to expect one TCP segment per encrypted TDS package.
|
|
// Setting DynamicRecordSizingDisabled to true disables that algorithm and uses 16384 bytes per TLS package
|
|
config.DynamicRecordSizingDisabled = true
|
|
outbuf.transport = conn
|
|
toconn.buf = outbuf
|
|
tlsConn := tls.Client(toconn, &config)
|
|
err = tlsConn.Handshake()
|
|
|
|
toconn.buf = nil
|
|
outbuf.transport = tlsConn
|
|
if err != nil {
|
|
return nil, fmt.Errorf("TLS Handshake failed: %v", err)
|
|
}
|
|
if encrypt == encryptOff {
|
|
outbuf.afterFirst = func() {
|
|
outbuf.transport = toconn
|
|
}
|
|
}
|
|
}
|
|
|
|
login := login{
|
|
TDSVersion: verTDS74,
|
|
PacketSize: uint32(outbuf.PackageSize()),
|
|
Database: p.database,
|
|
OptionFlags2: fODBC, // to get unlimited TEXTSIZE
|
|
HostName: p.workstation,
|
|
ServerName: p.host,
|
|
AppName: p.appname,
|
|
TypeFlags: p.typeFlags,
|
|
}
|
|
auth, auth_ok := getAuth(p.user, p.password, p.serverSPN, p.workstation)
|
|
if auth_ok {
|
|
login.SSPI, err = auth.InitialBytes()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
login.OptionFlags2 |= fIntSecurity
|
|
defer auth.Free()
|
|
} else {
|
|
login.UserName = p.user
|
|
login.Password = p.password
|
|
}
|
|
err = sendLogin(outbuf, login)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// processing login response
|
|
success := false
|
|
for {
|
|
tokchan := make(chan tokenStruct, 5)
|
|
go processResponse(context.Background(), &sess, tokchan, nil)
|
|
for tok := range tokchan {
|
|
switch token := tok.(type) {
|
|
case sspiMsg:
|
|
sspi_msg, err := auth.NextBytes(token)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if sspi_msg != nil && len(sspi_msg) > 0 {
|
|
outbuf.BeginPacket(packSSPIMessage, false)
|
|
_, err = outbuf.Write(sspi_msg)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = outbuf.FinishPacket()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
sspi_msg = nil
|
|
}
|
|
case loginAckStruct:
|
|
success = true
|
|
sess.loginAck = token
|
|
case error:
|
|
return nil, fmt.Errorf("Login error: %s", token.Error())
|
|
case doneStruct:
|
|
if token.isError() {
|
|
return nil, fmt.Errorf("Login error: %s", token.getError())
|
|
}
|
|
goto loginEnd
|
|
}
|
|
}
|
|
}
|
|
loginEnd:
|
|
if !success {
|
|
return nil, fmt.Errorf("Login failed")
|
|
}
|
|
if sess.routedServer != "" {
|
|
toconn.Close()
|
|
p.host = sess.routedServer
|
|
p.port = uint64(sess.routedPort)
|
|
if !p.hostInCertificateProvided {
|
|
p.hostInCertificate = sess.routedServer
|
|
}
|
|
goto initiate_connection
|
|
}
|
|
return &sess, nil
|
|
}
|