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
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
import asynchat, asyncore, socket
import pwd, os, sys, logging, logging.handlers
import mailbox, email
class SMTPChannel(asynchat.async_chat):
def __init__(self, server, sock, addr):
asynchat.async_chat.__init__(self, sock)
self.server = server
self.set_terminator("\n")
self.data = ""
self.read_data = False
self.push("220 Mailserver terrorist.at. Nutzung ohne vorige Erlaubnis verboten!\n")
def collect_incoming_data(self, data):
if len(self.data) > 0:
self.data += "\n"
self.data += data
self.server.logger.debug("Read: " + data.strip())
if self.data.__len__() > 16384:
self.server.logger.error("too much data, shutdown")
self.close_when_done()
def push(self,data):
self.server.logger.debug("Write: " + data)
asynchat.async_chat.push(self,data)
def log(self, message):
self.server.logger.info(message)
def log_info(self, message, type='info'):
self.server.logger.error("%s %s" % (type, message))
def handle_close(self):
asynchat.async_chat.handle_close(self)
if self.read_data and len(self.data) > 10:
#QUIT oder "." wurde nicht erkannt
mail = email.message_from_string(self.data)
key=self.server.maildir.add(mail)
self.server.logger.info("New Mail: %s" % key)
self.server.maildir.flush()
def found_terminator(self):
try:
if self.read_data:
if self.data.endswith("\n.") or self.data.endswith("\n.\r"):
self.read_data = False
self.push("250 Ok: queued as 12345\n")
mail = email.message_from_string(self.data)
key=self.server.maildir.add(mail)
self.server.logger.info("New Mail: %s" % key)
self.server.maildir.flush()
self.data = ""
else:
pass
elif self.data.startswith("EHLO") \
or self.data.startswith("HELO"):
self.push("250 Mailserver terrorist.at. Nutzung ohne vorige Erlaubnis verboten!\n")
self.data = ""
elif self.data.startswith("DATA"):
self.push("354 End data with <CR><LF>.<CR><LF>\n")
self.read_data = True
self.data=""
elif self.data.startswith("QUIT"):
self.data = ""
self.push("221 Bye\n")
self.close_when_done()
else:
self.push("250 OK\n")
self.data = ""
except Exception,e:
self.server.logger.error(str(e))
class SMTPServer(asyncore.dispatcher):
def __init__(self,interface,maildir_dir):
asyncore.dispatcher.__init__(self)
self.port = 25
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
self.bind((interface, self.port))
self.listen(5)
self.maildir = mailbox.Maildir(maildir_dir, create=True)
self.logger = logging.getLogger('smtplogger')
self.logger.setLevel(logging.DEBUG)
handler = logging.handlers.TimedRotatingFileHandler("log/smtp.log", "D", 1)
self.logger.addHandler(handler)
def handle_accept(self):
conn, addr = self.accept()
try:
self.logger.info("New Client %s:%s" % conn.getpeername())
SMTPChannel(self, conn, addr)
except Exception,e:
self.logger.error(str(e))
if __name__ == '__main__':
import getopt
def usage():
print """smtp.py
-d debug
-f foreground (no fork, no user changing)
-u USER setuserid to USER, else "nobody", see -f
-m MAILDIR set maildir path, else "Maildir/"
-s ADDR Bind to interface with ip ADDR, else 0.0.0.0
-h help"""
try:
opts, args = getopt.getopt(sys.argv[1:], "dfu:s:m:h")
except getopt.GetoptError, err:
print str(err)
usage();
sys.exit(2)
debug = False
foreground = False
user = "nobody"
maildir_dir = "Maildir"
interface = "0.0.0.0"
for o, a in opts:
if o == "-d":
debug = True
elif o == "-f":
foreground = True
elif o == "-u":
user = a
elif o == "-m":
maildir_dir = a
elif o == "-s":
interface = a
elif o == "-h":
usage()
sys.exit(0);
else:
assert False, "unhandled option:" + o
s = SMTPServer(interface, maildir_dir)
if not foreground:
#user change
pwinfo = pwd.getpwnam(user)
os.setregid(pwinfo[3],pwinfo[3])
os.setreuid(pwinfo[2],pwinfo[2])
#"Robustly turn into a UNIX daemon, running in our_home_dir."
# First fork
try:
if os.fork() > 0:
sys.exit(0) # kill off parent
except OSError, e:
sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror))
sys.exit(1)
os.setsid()
os.chdir('/')
os.umask(0)
# Second fork
try:
pid = os.fork()
if pid > 0:
os._exit(0)
except OSError, e:
sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror))
os._exit(1)
si = open('/dev/null', 'r')
so = open('/dev/null', 'a+', 0)
se = open('/dev/null', 'a+', 0)
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
# Set custom file descriptors so that they get proper buffering.
sys.stdout, sys.stderr = so, se
#"""
s.logger.info("Startup; pid=%s" % os.getpid())
asyncore.loop()
|
