From fbb070c94022ee8feb202b8d6a19e9348bbbfbb1 Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <woho@hottis.de>
Date: Mon, 12 Nov 2007 09:47:41 +0100
Subject: [PATCH] changes

---
 server/yadyn | 105 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)

diff --git a/server/yadyn b/server/yadyn
index dccea0e..c547621 100755
--- a/server/yadyn
+++ b/server/yadyn
@@ -5,6 +5,8 @@ import Queue
 import threading
 import md5
 import time
+import dns
+
 
 class Entry(object):
     def __init__(self, dynid, sharedSecret, name):
@@ -101,6 +103,90 @@ class Expirer(threading.Thread):
                     entry.address = NULL_ADDRESS
                     print "Set in DNS: %s -> %s" % (entry.name, entry.address)
             time.sleep(10)
+
+
+class DnsManipulator(threading.Thread):
+    def __init__(self, msgQueue, notifyQueue, tsigKey, nsAddress, zone, name, ttl, exitServerIp):
+        threading.Thread.__init__(self)
+        self.msgQueue = msgQueue
+        self.notifyQueue = notifyQueue
+        self.exitServerIp = exitServerIp
+        self.statusMap = {}
+        self.exitServerFlag = True
+        self.nsAddress = nsAddress
+        self.zone = zone
+        self.name = name
+        self.ttl = ttl
+        self.keyring = dns.tsigkeyring.from_text(tsigKey)
+
+    def run(self):
+        while(True):
+            msg = self.msgQueue.get()
+            
+            if msg.successFlag:
+                # success
+                Logger.dbg("DnsManipulator: retrieved positive message")
+                if not self.statusMap.has_key(msg.ip) or not self.statusMap[msg.ip]:
+                    self.statusMap[msg.ip] = True
+                    self.insertARR(msg.ip)
+                    
+                    self.notifyQueue.put(NotificationMessage("Server returned", "Server %s is back" % msg.ip))
+            else:
+                # failure
+                Logger.dbg("DnsManipulator: retrieved negative message")
+                if not self.statusMap.has_key(msg.ip) or self.statusMap[msg.ip]:
+                    self.statusMap[msg.ip] = False
+                    self.deleteARR(msg.ip)
+
+                    self.notifyQueue.put(NotificationMessage("Server unavailable", "Server %s has gone" % msg.ip))
+
+            failureCnt = 0
+            for v in self.statusMap.values():
+                if not v:
+                    failureCnt += 1
+            
+            if failureCnt > 0 and not self.exitServerFlag:
+                self.insertARR(self.exitServerIp)
+                self.exitServerFlag = True
+                
+            if failureCnt == 0 and self.exitServerFlag:
+                self.deleteARR(self.exitServerIp)
+                self.exitServerFlag = False
+
+                self.notifyQueue.put(NotificationMessage("All clear", "All clear, exit-server removed from DNS"))
+                    
+    def insertARR(self, ip):
+        # send A-RR insertion for ip to DNS server
+        Logger.log("insert ARR %s" % ip)
+
+        rr = dns.rdtypes.IN.A.A(dns.rdataclass.IN, dns.rdatatype.A, ip)
+        u = dns.update.Update(self.zone, keyring=self.keyring)
+        u.add(self.name, self.ttl, rr)
+        r = dns.query.tcp(u, self.nsAddress)
+
+        if r.rcode() != 0:
+            # failure
+            Logger.log("failure when inserting A-RR for %s" % ip)
+        else:
+            # success
+            pass
+
+    def deleteARR(self, ip):
+        # send A-RR deletion for ip to DNS server
+        Logger.log("delete ARR %s" % ip)
+                
+        rr = dns.rdtypes.IN.A.A(dns.rdataclass.IN, dns.rdatatype.A, ip)
+        u = dns.update.Update(self.zone, keyring=self.keyring)
+        u.delete(self.name, rr)
+        r = dns.query.tcp(u, self.nsAddress)
+
+        if r.rcode() != 0:
+            # failure
+            Logger.log("failure when deleting A-RR for %s" % ip)
+        else:
+            # success
+            pass
+
                                 
 
 ENTRIES = {
@@ -109,6 +195,25 @@ ENTRIES = {
 MSG_TIME_CORRIDOR = 5
 EVENT_LIFE_TIME = 10
 NULL_ADDRESS = '0.0.0.0'
+ZONE = 'contextmatters.de'
+NAME = 'serve'
+TTL = 120
+NAMESERVER = '127.0.0.1'
+TSIGKEY = { "monitoring." : "HYHN8l/dg1+q6QLOURp2qw==" }
+EXITSERVER = '87.230.59.51'
+FAILURE_THRESHOLD = 3
+PERIOD = 10
+FROM = "root@hottis.de"
+TO = "dns-alarm@adinside.de"
+SMTPHOST = "submission.hottis.de"
+SMTPPORT = 25
+SMTPLOGIN = "admon-adinside"
+SMTPPASSWD = "test123"
+DEBUG = False
+PIDFILE = "/tmp/monitor.pid"
+
+
+
 
 q = Queue.Queue()