import

1 files changed, 105 insertions, 0 deletions

diff --git a/smtp.py b/smtp.py
new file mode 100644
index 0000000..b1b2e67
--- /dev/null
+++ b/smtp.py
@@ -0,0 +1,105 @@
+import asynchat, asyncore, socket
+import pwd, os, sys
+import email
+from mailbox import Maildir,MaildirMessage
+
+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
+
+    def collect_incoming_data(self, data):
+        if len(self.data) > 0:
+            self.data += "\n"
+        self.data += data
+        if self.data.__len__() > 16384:
+            print "too much data, shutdown"
+            self.close_when_done()
+
+    def found_terminator(self):
+        print self.data
+        if self.read_data:
+            if self.data.endswith("\n."):
+                self.push("250 Ok: queued as 12345\n")
+                self.read_data = False
+                mail = email.message_from_string(self.data)
+                self.server.maildir.add(mail)
+                self.server.maildir.flush()
+                self.data = ""
+                
+        elif self.data.startswith("EHLO") \
+                or self.data.startswith("HELO"):
+            self.push("HELO there\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 = ""
+            
+
+class SMTPServer(asyncore.dispatcher):
+    def __init__(self):
+        asyncore.dispatcher.__init__(self)
+        self.port = 25
+        self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
+        self.set_reuse_addr()
+        self.bind(("", self.port))
+        self.listen(5)
+        self.maildir = Maildir("Maildir", create=True)
+
+    def handle_accept(self):
+        conn, addr = self.accept()
+        SMTPChannel(self, conn, addr)
+
+
+
+if __name__ == '__main__':
+    s = SMTPServer()
+
+    #user change
+    pwinfo = pwd.getpwnam('nobody')
+    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:
+        pid = os.fork()
+        if pid > 0:
+            print "PID: %s" % pid
+            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:
+        if os.fork() > 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
+ 
+    asyncore.loop()