-
Notifications
You must be signed in to change notification settings - Fork 2
/
FakeSMTP.java
103 lines (92 loc) · 2.88 KB
/
FakeSMTP.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Logger;
public class FakeSMTP {
static Logger log = Logger.getLogger("FakeSMPT");
String workDir = "/tmp/";
private void write(OutputStream out, String line)
throws UnsupportedEncodingException, IOException {
System.out.println("<-- " + line);
out.write((line + "\r\n").getBytes("UTF-8"));
}
private String writeAndRead(OutputStream out, String line, Scanner scan)
throws UnsupportedEncodingException, IOException {
write(out, line);
String ret = scan.nextLine();
System.out.println("--> " + ret);
return ret;
}
private boolean writeAndCheck(OutputStream out, String line, Scanner scan,
String... prefix) throws UnsupportedEncodingException, IOException {
String ret = writeAndRead(out, line, scan);
for (String s : prefix) {
if (ret.startsWith(s))
return true;
}
return false;
}
private String getAddr(String line) {
return line.substring(line.indexOf('<') + 1, line.indexOf('>')).trim();
}
private void handle(Socket s) {
try {
OutputStream out = s.getOutputStream();
Scanner scan = new Scanner(s.getInputStream());
if (writeAndCheck(out, "220 ESMTP Postfix", scan, "HELO", "EHLO")) {
String from = getAddr(writeAndRead(out, "250 Hello", scan));
String to = getAddr(writeAndRead(out, "250 Ok", scan));
if (writeAndCheck(out, "250 Ok", scan, "DATA")) {
write(out, "354 End data with <CR><LF>.<CR><LF>");
StringBuilder data = new StringBuilder();
while (scan.hasNextLine()) {
String line = scan.nextLine();
if (line.trim().equals("."))
break;
data.append(line).append("\r\n");
}
long ctime = System.currentTimeMillis();
log.info(from + "-->" + to + "\t" + data.length());
// 这里可以处理收到的邮件。
Files.write(Paths.get(workDir + from + "-" + to + ctime
+ ".eml"), data.toString().getBytes("UTF-8"));
if (writeAndCheck(out, "250 Ok", scan, "quit"))
write(out, "221 Bye");
}
}
scan.close();
out.close();
s.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
try (ServerSocket ss = new ServerSocket(1025)) {
int count = 0;
log.info("server started");
FakeSMTP smtp = new FakeSMTP();
ExecutorService ser = Executors.newFixedThreadPool(10);
while (true) {
Socket s = ss.accept();
log.info((count++) + "\t" + s.getRemoteSocketAddress()
+ " connected");
ser.execute(new Runnable() {
@Override
public void run() {
smtp.handle(s);
}
});
}
} catch (Exception e) {
e.printStackTrace();
}
}
}