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inst.go
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inst.go
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//go:build windows
package main
/*
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include <odbcinst.h>
#include <stdlib.h>
#cgo LDFLAGS: -lodbc32 -lodbccp32
*/
import "C"
import (
"flag"
"fmt"
"io"
"os"
"syscall"
"unsafe"
)
/*
BOOL SQLInstallDriverEx(
LPCSTR lpszDriver,
LPCSTR lpszPathIn,
LPSTR lpszPathOut,
WORD cbPathOutMax,
WORD * pcbPathOut,
WORD fRequest,
LPDWORD lpdwUsageCount);
BOOL SQLRemoveDriver(
LPCSTR lpszDriver,
BOOL fRemoveDSN,
LPDWORD lpdwUsageCount);
BOOL SQLConfigDataSource(
HWND hwndParent,
WORD fRequest,
LPCSTR lpszDriver,
LPCSTR lpszAttributes);
*/
const subcommandMsg = "expected 'install' or 'uninstall' subcommands"
type SQLInstallError struct {
Code int
Message string
}
func (e *SQLInstallError) Error() string {
return fmt.Sprintf("code %d: %v", e.Code, e.Message)
}
type SQLInstallErrors struct {
Errors []SQLInstallError
}
func (e *SQLInstallErrors) Error() string {
str := ""
for _, m := range e.Errors {
str += m.Error() + "\n"
}
return str
}
func getSQLInstallerError() *SQLInstallErrors {
errorMsg := C.malloc(C.size_t(C.SQL_MAX_MESSAGE_LENGTH))
defer C.free(errorMsg)
var errs SQLInstallErrors
for i := 0; ; i++ {
var errorCode C.DWORD
var errLen C.WORD
rc := C.SQLInstallerError(C.ushort(i), &errorCode, C.LPSTR(errorMsg), C.SQL_MAX_MESSAGE_LENGTH-1, &errLen)
if rc == C.SQL_NO_DATA {
break
}
var err SQLInstallError
err.Code = int(errorCode)
err.Message = C.GoStringN((*C.char)(errorMsg), C.int(errLen))
errs.Errors = append(errs.Errors, err)
}
return &errs
}
func driverString(driverName, dll, path string) string {
if path != "" {
dll = path + "\\" + dll
}
return driverName + "\000Driver=" + dll + "\000Setup=" + dll + "\000ConnectFunctions=YYN\000"
}
func getInstallPath(driverName, dll string) (string, error) {
const maxPath = 500
var pathLen C.WORD
var usageCount C.DWORD
path := C.malloc(C.size_t(maxPath))
defer C.free(path)
if C.SQLInstallDriverEx(C.CString(driverString(driverName, dll, "")), nil, C.LPSTR(path), maxPath, &pathLen, C.ODBC_INSTALL_INQUIRY, &usageCount) != 1 {
return "", getSQLInstallerError()
}
return C.GoString((*C.char)(path)), nil
}
func copyFile(src, dst string) (int64, error) {
sourceFileStat, err := os.Stat(src)
if err != nil {
return 0, err
}
if !sourceFileStat.Mode().IsRegular() {
return 0, fmt.Errorf("%s is not a regular file", src)
}
source, err := os.Open(src)
if err != nil {
return 0, err
}
defer source.Close()
destination, err := os.Create(dst)
if err != nil {
return 0, err
}
defer destination.Close()
nBytes, err := io.Copy(destination, source)
return nBytes, err
}
func deleteFile(path string) {
cPath := C.CString(path)
defer C.free(unsafe.Pointer(cPath))
C.DeleteFile(cPath)
}
func install(driverName, dll, installPath string) error {
const maxPath = 500
var pathLen C.WORD
var usageCount C.DWORD
dst := installPath + "\\" + dll
if _, err := copyFile(dll, dst); err != nil {
return err
}
path := C.malloc(C.size_t(maxPath))
defer C.free(path)
if C.SQLInstallDriverEx(C.CString(driverString(driverName, dll, installPath)), C.CString(installPath), C.LPSTR(path), maxPath, &pathLen, C.ODBC_INSTALL_COMPLETE, &usageCount) != 1 {
return getSQLInstallerError()
}
return nil
}
type configDataSourceAction int
const (
addDsn configDataSourceAction = C.ODBC_ADD_SYS_DSN
removeDsn = C.ODBC_REMOVE_SYS_DSN
)
func configDataSource(driverName, dsnName string, action configDataSourceAction) error {
attr := "DSN=" + dsnName + "\000Database=\000"
if C.SQLConfigDataSource(nil, C.ushort(action), C.CString(driverName), C.CString(attr)) != 1 {
return getSQLInstallerError()
}
return nil
}
func main() {
var dll, driverName, dsnName string
installCmd := flag.NewFlagSet("install", flag.ExitOnError)
installCmd.StringVar(&dll, "dll", "kom2.dll", "name of the dll")
installCmd.StringVar(&driverName, "driver", "kom2", "driver name")
installCmd.StringVar(&dsnName, "dsnName", "kom2", "dsn name")
uninstallCmd := flag.NewFlagSet("remove", flag.ExitOnError)
uninstallCmd.StringVar(&dll, "dll", "kom2.dll", "name of the dll")
uninstallCmd.StringVar(&driverName, "driver", "kom2", "driver name")
uninstallCmd.StringVar(&dsnName, "dsnName", "kom2", "dsn name")
infoCmd := flag.NewFlagSet("info", flag.ExitOnError)
infoCmd.StringVar(&dll, "dll", "kom2.dll", "name of the dll")
infoCmd.StringVar(&driverName, "driver", "kom2", "driver name")
infoCmd.StringVar(&dsnName, "dsnName", "kom2", "dsn name")
if len(os.Args) < 2 {
fmt.Println(subcommandMsg)
os.Exit(1)
}
switch os.Args[1] {
case "install":
var err error
var path string
if path, err = getInstallPath(driverName, dll); err != nil {
panic(err)
}
installCmd.Parse(os.Args[2:])
if err = install(driverName, dll, path); err != nil {
panic(err)
}
configDataSource(driverName, dsnName, removeDsn)
if err = configDataSource(driverName, dsnName, addDsn); err != nil {
panic(err)
}
case "uninstall":
uninstallCmd.Parse(os.Args[2:])
var err error
var path string
if path, err = getInstallPath(driverName, dll); err != nil {
panic(err)
}
configDataSource(driverName, dsnName, removeDsn)
driver := driverString(driverName, dll, path)
var count C.ulong = 1
for count > 0 {
if C.SQLRemoveDriver(C.CString(driver), 1, &count) != 1 {
panic(getSQLInstallerError())
}
}
deleteFile(path)
case "info":
infoCmd.Parse(os.Args[2:])
var err error
var path string
if path, err = getInstallPath(driverName, dll); err != nil {
panic(err)
}
dllPath := path + "\\" + dll
mod := syscall.NewLazyDLL(dllPath)
proc := mod.NewProc("VersionInfo")
version := func() string {
defer func() {
if r := recover(); r != nil {
fmt.Println(r)
os.Exit(1)
}
}()
buffer := C.malloc(250)
defer C.free(buffer)
_, _, err = proc.Call(uintptr(buffer), uintptr(250))
if err != syscall.Errno(0) {
fmt.Println(err.Error())
os.Exit(1)
}
return C.GoString((*C.char)(buffer))
}()
fmt.Printf("path: %s; version: %s\n", dllPath, version)
default:
fmt.Println(subcommandMsg)
os.Exit(1)
}
}