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package srvconn
import (
"bytes"
"errors"
"fmt"
"os"
"os/exec"
"os/user"
"strconv"
"sync"
"syscall"
"time"
"github.com/creack/pty"
"github.com/jumpserver/koko/pkg/logger"
)
const (
mysqlPrompt = "Enter password: "
)
func NewMysqlServer(ops ...SqlOption) *ServerMysqlConnection {
args := &SqlOptions{
Username: os.Getenv("USER"),
Password: os.Getenv("PASSWORD"),
Host: "127.0.0.1",
Port: 3306,
DBName: "",
}
for _, setter := range ops {
setter(args)
}
return &ServerMysqlConnection{options: args, onceClose: new(sync.Once)}
}
type ServerMysqlConnection struct {
options *SqlOptions
ptyFD *os.File
onceClose *sync.Once
cmd *exec.Cmd
}
func (dbconn *ServerMysqlConnection) Connect() (err error) {
dbconn.cmd = exec.Command("mysql", dbconn.options.CommandArgs()...)
nobody, err := user.Lookup("nobody")
if err != nil {
logger.Errorf("lookup nobody user err: %s", err)
return errors.New("nobody user does not exist")
}
dbconn.cmd.SysProcAttr = &syscall.SysProcAttr{}
uid, _ := strconv.Atoi(nobody.Uid)
gid, _ := strconv.Atoi(nobody.Gid)
dbconn.cmd.SysProcAttr.Credential = &syscall.Credential{Uid: uint32(uid), Gid: uint32(gid)}
dbconn.ptyFD, err = pty.Start(dbconn.cmd)
if err != nil {
logger.Errorf("pty start err: %s", err)
return fmt.Errorf("start local pty err: %s", err)
}
prompt := [len(mysqlPrompt)]byte{}
nr, err := dbconn.ptyFD.Read(prompt[:])
if err != nil {
_ = dbconn.ptyFD.Close()
_ = dbconn.cmd.Process.Kill()
logger.Errorf("read mysql pty local fd err: %s", err)
return fmt.Errorf("mysql conn err: %s", err)
}
if !bytes.Equal(prompt[:nr], []byte(mysqlPrompt)) {
_ = dbconn.cmd.Process.Kill()
_ = dbconn.ptyFD.Close()
logger.Errorf("mysql login prompt characters did not match: %s", prompt[:nr])
return errors.New("failed login mysql")
}
// 输入密码, 登录mysql
_, err = dbconn.ptyFD.Write([]byte(dbconn.options.Password + "\r\n"))
if err != nil {
_ = dbconn.ptyFD.Close()
_ = dbconn.cmd.Process.Kill()
logger.Errorf("mysql local pty write err: %s", err)
return fmt.Errorf("mysql conn err: %s", err)
}
logger.Infof("Connect mysql database %s success ", dbconn.options.Host)
return
}
func (dbconn *ServerMysqlConnection) Read(p []byte) (int, error) {
if dbconn.ptyFD == nil {
return 0, fmt.Errorf("not connect init")
}
return dbconn.ptyFD.Read(p)
}
func (dbconn *ServerMysqlConnection) Write(p []byte) (int, error) {
if dbconn.ptyFD == nil {
return 0, fmt.Errorf("not connect init")
}
return dbconn.ptyFD.Write(p)
}
func (dbconn *ServerMysqlConnection) SetWinSize(w, h int) error {
if dbconn.ptyFD == nil {
return fmt.Errorf("not connect init")
}
win := pty.Winsize{
Rows: uint16(h),
Cols: uint16(w),
}
return pty.Setsize(dbconn.ptyFD, &win)
}
func (dbconn *ServerMysqlConnection) Close() (err error) {
dbconn.onceClose.Do(func() {
if dbconn.ptyFD == nil {
return
}
_ = dbconn.ptyFD.Close()
err = dbconn.cmd.Process.Kill()
})
return
}
func (dbconn *ServerMysqlConnection) Timeout() time.Duration {
return time.Duration(10) * time.Second
}
func (dbconn *ServerMysqlConnection) Protocol() string {
return "mysql"
}
type SqlOptions struct {
Username string
Password string
DBName string
Host string
Port int
}
func (opts *SqlOptions) CommandArgs() []string {
return []string{
fmt.Sprintf("--user=%s", opts.Username),
fmt.Sprintf("--host=%s", opts.Host),
fmt.Sprintf("--port=%d", opts.Port),
"--password",
opts.DBName,
}
}
type SqlOption func(*SqlOptions)
func SqlUsername(username string) SqlOption {
return func(args *SqlOptions) {
args.Username = username
}
}
func SqlPassword(password string) SqlOption {
return func(args *SqlOptions) {
args.Password = password
}
}
func SqlDBName(dbName string) SqlOption {
return func(args *SqlOptions) {
args.DBName = dbName
}
}
func SqlHost(host string) SqlOption {
return func(args *SqlOptions) {
args.Host = host
}
}
func SqlPort(port int) SqlOption {
return func(args *SqlOptions) {
args.Port = port
}
}