networking

nzx_tmpmail/network/lmtp.go

@@ -0,0 +1,85 @@
+package network
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+
+	"git.uwushka.cc/nzx056/nzx056/nzx_tmpmail/loggingshit"
+)
+
+type Session struct {
+	Conn       net.Conn
+	Reader     *bufio.Reader
+	Writer     *bufio.Writer
+	MailFrom   string
+	RcptTo     []string
+	RemoteAddr string
+}
+
+func init() {
+	loggingshit.Log("lmtp init", 1)
+	ln, err := net.Listen("tcp", "127.0.0.1:2525")
+	if err != nil {
+		loggingshit.Log("lmtp init failed with error %v", 3, err)
+	}
+
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			loggingshit.Log("failed to accept connection with error %v, skipping", 2, err)
+			continue
+		}
+
+		go handle_conn(conn)
+	}
+}
+
+func handle_conn(conn net.Conn) {
+	defer conn.Close()
+
+	s := &Session{
+		Conn:       conn,
+		Writer:     bufio.NewWriter(conn),
+		Reader:     bufio.NewReader(conn),
+		RemoteAddr: conn.RemoteAddr().String(),
+	}
+
+	s.reply("220 nzx056.love LMTP ready")
+
+	for {
+		l, err := s.readline()
+		if err != nil {
+			if err != io.EOF {
+				loggingshit.Log("readline failed for %s with error: %v", 2, s.RemoteAddr, err)
+			}
+			loggingshit.Log("caught EOF from %s, closing conn", 2, s.RemoteAddr)
+			return
+		}
+
+		upper := strings.ToUpper(l)
+
+		switch {
+
+		}
+	}
+}
+
+func (s *Session) readline() (string, error) {
+	l, err := s.Reader.ReadString('\n')
+	if err != nil {
+		return "", err
+	}
+
+	l = strings.TrimRight(l, "\r\n")
+	loggingshit.Log("readline %s from %s", 1, l, s.RemoteAddr)
+	return l, nil
+}
+
+func (s *Session) reply(st string) {
+	loggingshit.Log("write to %s: %s", 1, s.RemoteAddr, st)
+	fmt.Fprintf(s.Writer, "%s\r\n", st)
+	s.Writer.Flush()
+}