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package smtpserver
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import (
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"b612.me/starlog"
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"b612.me/startext"
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"bytes"
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"crypto/tls"
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"fmt"
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"github.com/spf13/cobra"
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"html"
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"io"
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"io/ioutil"
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"mime"
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"mime/quotedprintable"
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"net/mail"
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"os"
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"strings"
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"time"
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"github.com/emersion/go-smtp"
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)
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var addr string
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var user, pass string
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var allowAnyuser bool
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var output string
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var domain string
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var cert, key string
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var Cmd = &cobra.Command{
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Use: "smtps",
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Short: "smtp server",
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Long: "smtp server",
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Run: func(cmd *cobra.Command, args []string) {
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run()
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},
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}
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func init() {
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Cmd.Flags().StringVarP(&addr, "addr", "a", "0.0.0.0:25", "smtp server listen address")
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Cmd.Flags().StringVarP(&user, "user", "u", "admin", "smtp server username")
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Cmd.Flags().StringVarP(&pass, "pass", "p", "admin", "smtp server password")
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Cmd.Flags().BoolVarP(&allowAnyuser, "allow-anyuser", "A", false, "allow any user")
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Cmd.Flags().StringVarP(&output, "output", "o", "", "output mail to html")
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Cmd.Flags().StringVarP(&domain, "domain", "d", "localhost", "smtp server domain")
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Cmd.Flags().StringVarP(&cert, "cert", "c", "", "smtp server cert(TLS)")
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Cmd.Flags().StringVarP(&key, "key", "k", "", "smtp server key(TLS)")
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}
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type backend struct{}
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func (bkd *backend) NewSession(c *smtp.Conn) (smtp.Session, error) {
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return &session{}, nil
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}
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type session struct {
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username string
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password string
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to string
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}
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func (s *session) AuthPlain(username, password string) error {
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s.username = username
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s.password = password
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starlog.Printf("username:%s,password:%s\n", username, password)
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if allowAnyuser {
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return nil
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} else {
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if username != user || password != pass {
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return smtp.ErrAuthFailed
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}
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}
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return nil
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}
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func (s *session) Mail(from string, opts *smtp.MailOptions) error {
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return nil
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}
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func (s *session) Rcpt(to string, opts *smtp.RcptOptions) error {
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s.to += to + ";"
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return nil
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}
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func (s *session) Data(r io.Reader) error {
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mailData, err := ioutil.ReadAll(r)
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if err != nil {
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return err
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}
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msg, err := mail.ReadMessage(bytes.NewReader(mailData))
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if err != nil {
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return err
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}
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header := msg.Header
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subject := header.Get("Subject")
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to := header.Get("To")
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cc := header.Get("Cc")
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from := header.Get("From") // 获取发件人
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date := header.Get("Date")
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body, err := ioutil.ReadAll(msg.Body)
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if err != nil {
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return err
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}
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var bodyStr string
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var d = new(mime.WordDecoder)
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{
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subject, err = d.DecodeHeader(subject)
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if err != nil {
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starlog.Errorf("Decode subject %s error:%s\n", subject, err)
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return err
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}
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bodyStr, err = bodyDecode(string(body))
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if err != nil {
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starlog.Errorf("Decode body %s error:%s\n", string(body), err)
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return err
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}
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}
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if startext.IsGBK([]byte(bodyStr)) {
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tmp, err := startext.GBK2UTF8([]byte(bodyStr))
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if err == nil {
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bodyStr = string(tmp)
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}
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}
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starlog.Println("From:", from)
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starlog.Println("Subject:", subject)
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starlog.Println("To ALL:", s.to)
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starlog.Println("To:", to)
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starlog.Println("Cc:", cc)
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starlog.Println("Body:", bodyStr)
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if output != "" {
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path := fmt.Sprintf("%s/%s_%s.html", output, subject, time.Now().Format("2006_01_02_15_04_05_"))
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html := fmt.Sprintf(`<html><head>
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<meta charset="utf-8">
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<title>%s</title>
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</head>
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<body>
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<h2>%s</h2>
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<hr>
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<p>auth user:<strong> %s </strong></p>
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<p>auth pass:<strong> %s </strong></p>
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<hr>
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<p>Date:<strong> %v </strong></p>
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<p>From:<strong> %s </strong></p>
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<p>To All:<strong> %s </strong></p>
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<p>To:<strong> %s </strong></p>
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<p>Cc:<strong> %s </strong></p>
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<hr>
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<br />
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<br />
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%s
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</body>
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</html>`, html.EscapeString(subject), html.EscapeString(subject), html.EscapeString(s.username), html.EscapeString(s.password),
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date, html.EscapeString(from), html.EscapeString(s.to), html.EscapeString(to), html.EscapeString(cc), bodyStr)
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os.WriteFile(path, []byte(html), 0644)
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}
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return nil
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}
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func (s *session) Reset() {}
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func (s *session) Logout() error {
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return nil
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}
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func run() {
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var err error
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s := smtp.NewServer(&backend{})
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if cert != "" && key != "" {
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var config tls.Config
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config.Certificates = make([]tls.Certificate, 1)
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config.Certificates[0], err = tls.LoadX509KeyPair(cert, key)
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if err != nil {
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starlog.Errorln("failed to load cert:", err)
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return
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}
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s.TLSConfig = &config
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s.Addr = addr
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s.Domain = domain
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s.AllowInsecureAuth = true
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s.Debug = os.Stdout
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starlog.Infoln("Starting TLS-SMTP server at", addr)
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starlog.Errorln(s.ListenAndServeTLS())
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return
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}
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s.Addr = addr
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s.Domain = domain
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s.AllowInsecureAuth = true
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s.Debug = os.Stdout
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starlog.Infoln("Starting SMTP server at", addr)
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starlog.Errorln(s.ListenAndServe())
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}
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func bodyDecode(encoded string) (string, error) {
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encoded = strings.Replace(encoded, "=\r\n", "", -1) // 对于Windows系统
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encoded = strings.Replace(encoded, "=\n", "", -1) // 对于UNIX/Linux系统
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// 创建一个新的Quoted-Printable阅读器
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reader := quotedprintable.NewReader(strings.NewReader(encoded))
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// 读取并解码整个内容
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decoded, err := ioutil.ReadAll(reader)
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if err != nil {
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fmt.Println("Error decoding string:", err)
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return string(decoded), err
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}
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return string(decoded), nil
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}
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