From 09ea945c3908fd42e90eb64c194d9af11d174206 Mon Sep 17 00:00:00 2001
From: Kristian Lyngstol <kristian@bohemians.org>
Date: Tue, 12 Apr 2016 18:01:32 +0200
Subject: Actual initial import

Fetched from tgmanage.
---
 fap/dhcpd/DHCP_protocol_breakdown.txt |  18 ++
 fap/dhcpd/module_craft_option.py      |  79 ++++++++
 fap/dhcpd/module_lease.py             | 174 ++++++++++++++++
 fap/dhcpd/server_dhcp.py              | 360 ++++++++++++++++++++++++++++++++++
 fap/dhcpd/terminal.log                | 146 ++++++++++++++
 5 files changed, 777 insertions(+)
 create mode 100755 fap/dhcpd/DHCP_protocol_breakdown.txt
 create mode 100755 fap/dhcpd/module_craft_option.py
 create mode 100755 fap/dhcpd/module_lease.py
 create mode 100755 fap/dhcpd/server_dhcp.py
 create mode 100755 fap/dhcpd/terminal.log

(limited to 'fap/dhcpd')

diff --git a/fap/dhcpd/DHCP_protocol_breakdown.txt b/fap/dhcpd/DHCP_protocol_breakdown.txt
new file mode 100755
index 0000000..5af2bf2
--- /dev/null
+++ b/fap/dhcpd/DHCP_protocol_breakdown.txt
@@ -0,0 +1,18 @@
+Length of DHCP fields in octets, and their placement in packet.
+Ref: http://4.bp.blogspot.com/-IyYoFjAC4l8/UXuo16a3sII/AAAAAAAAAXQ/b6BojbYXoXg/s1600/DHCPTitle.JPG
+0  OP - 1
+1  HTYPE - 1
+2  HLEN - 1
+3  HOPS - 1
+4  XID - 4
+5  SECS - 2
+6  FLAGS - 2
+7  CIADDR - 4
+8  YIADDR - 4
+9  SIADDR - 4
+10 GIADDR - 4
+11 CHADDR - 6
+12 MAGIC COOKIE - 10
+13 PADDING - 192 octets of 0's
+14 MAGIC COOKIE - 4
+15 OPTIONS - variable length
diff --git a/fap/dhcpd/module_craft_option.py b/fap/dhcpd/module_craft_option.py
new file mode 100755
index 0000000..35e7328
--- /dev/null
+++ b/fap/dhcpd/module_craft_option.py
@@ -0,0 +1,79 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+'''
+    Created by Jonas 'j' Lindstad for The Gathering 2015
+    License: GPLv3
+    
+    Class used to craft byte hex encoded DHCP options
+    
+    NB: No direct support for suboptions. Should be possible to craft suboptions as
+    options, and inject them with craft_option(<option>).raw_hes(<conconcatenated options>)
+    
+    Usage examples:
+    craft_option.debug = True
+    print(craft_option(1).string('vg.no'))
+    print(craft_option(2).bytes(b'abcd'))
+    print(craft_option(3).bytes(socket.inet_aton('192.168.0.55')))
+    print(craft_option(4).bytes(b'\xde\xad\xbe\xef\xfe\xed'))
+    print(craft_option(5).raw_hex(b'\x72\x78'))
+    print(craft_option(6).ip('255.255.128.0'))
+'''
+
+from binascii import hexlify, unhexlify
+
+class craft_option(object):
+    # content = b'' # content will be stored as hex values like hex(10) + hex(255) =  0aff
+    debug = False
+    def __init__(self, code):
+        self.code = self.__int_to_pad_byte(code)
+
+    # Works as intended
+    # internal function. Converts int(3) to str('03'), int('11') to str('0b'), int(255) to str('ff')
+    def __int_to_pad_byte(self, integer):
+        return hex(integer).split('x')[1].rjust(2, '0').encode()
+
+    # Works as intended
+    def string(self, string):
+        self.method = 'string'
+        self.content = hexlify(string.encode())
+        return self.process()
+
+    # Works as intended
+    def bytes(self, bytes):
+        self.method = 'bytes'
+        self.content = hexlify(bytes)
+        return self.process()
+        
+    # Works as intended
+    # str('10.20.30.40') to b'\x10\x20\x30\x40'
+    def ip(self, ip):
+        self.method = 'ip'
+        self.content = ''.join([hex(int(i))[2:].rjust(2, '0') for i in ip.split('.')]).encode()
+        return self.process()
+
+    # Works as intended
+    # string like '\x72\x78' for 'rx'
+    def raw_hex(self, raw_hex):
+        self.method = 'raw_hex'
+        self.content = hexlify(raw_hex)
+        return self.process()
+
+
+
+    # TODO Does not work as intended
+    # int(666) to b'\x02\x9A'
+    def integer(self, integer):
+        self.method = 'integer'
+        self.content = ''.join([hex(int(i))[2:].rjust(2, '0') for i in ip.split('.')])
+        return self.process()
+        
+    def process(self):
+        length = self.__int_to_pad_byte(len(unhexlify(self.content)))
+        if self.debug is True:
+            print('----------')
+            print(self.method + '():')
+            print(self.code + length)
+            print(b'content: ' + self.content)
+            print(unhexlify(self.content))
+        return unhexlify(self.code + length + self.content)
diff --git a/fap/dhcpd/module_lease.py b/fap/dhcpd/module_lease.py
new file mode 100755
index 0000000..0473579
--- /dev/null
+++ b/fap/dhcpd/module_lease.py
@@ -0,0 +1,174 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+'''
+    Created by Jonas 'j' Lindstad for The Gathering 2015
+    License: GPLv3
+    
+    Class used to fetch data from the Postgres DB
+    
+    Usage examples:
+    lease.debug = True
+    x = lease({'distro_name': 'distro-test', 'distro_phy_port': 'ge-0/0/6'}).get_dict()
+    print('key lookup - hostname: %s' % x['hostname'])
+'''
+
+import psycopg2
+import psycopg2.extras
+
+# settings
+settings = dict(
+    db = dict(
+	    user = 'fap',
+	    password = '<sensored>',
+	    dbname = 'fap',
+	    host = 'localhost'
+    )
+)
+
+# connect to Postgres DB
+connect_params = ("dbname='%s' user='%s' host='%s' password='%s'" % (settings['db']['dbname'], settings['db']['user'], settings['db']['host'], settings['db']['password']))
+conn = psycopg2.connect(connect_params)
+cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
+
+class lease(object):
+    debug = False
+
+    def __init__(self, identifiers):
+        if len(identifiers) > 0: # 1 or more identifiers - we're good to go
+            
+            # build query string
+            where_pieces = []
+            for x in identifiers.items():
+                where_pieces.append(str(x[0]) + " = '" + str(x[1]) + "'")
+            where = ' AND '.join(where_pieces)
+            select = "SELECT * FROM switches WHERE " + where + " LIMIT 1"
+            
+            if self.debug is True:
+                print('Executing query: ' + select)
+            
+            cur.execute(select)
+            
+            rows = cur.fetchall()
+            if len(rows) is 1:
+                if self.debug is True:
+                    print('returned from DB:')
+                    for key, value in rows[0].items():
+                        print('%s: %s' % (key, value))
+                    
+                self.row = rows[0]
+            else:
+                self.row = False
+        else:
+            print('Missing identifier parameter')
+            exit()
+        
+    def get_ip(self):
+        if self.row is not False:
+            return self.row['ip']
+        else:
+            print('identifiers (%s) not found' % self.row)
+            return False
+            
+    def get_config(self):
+        if self.row is not False:
+            return self.row['config']
+        else:
+            print('identifiers (%s) not found' % self.row)
+            return False
+            
+    def get_dict(self):
+        if self.row is not False:
+            return self.row
+        else:
+            print('identifiers (%s) not found' % self.row)
+            return False
+
+
+#
+# TESTING - Bruker ID fra DB-en som identifier, og kjører en query per lease.get_x()
+#
+class lease2(object):
+    debug = False
+    hostname = False
+    identifiers = False
+    
+    # identifiers = dict of field/values
+    def __init__(self, identifiers):
+        cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
+    
+        if len(identifiers) > 0: # 1 or more identifiers - we're good to go
+            self.identifiers = identifiers # Used to debug if no match for the identifiers is given
+            
+            # build query string
+            where_pieces = []
+            for identifier in identifiers.items():
+                where_pieces.append(str(identifier[0]) + " = '" + str(identifier[1]) + "'")
+            where = ' AND '.join(where_pieces)
+            select = "SELECT hostname FROM switches WHERE " + where + " LIMIT 1"
+            
+            if self.debug is True:
+                print('Executing query: ' + select)
+            
+            cur.execute(select)
+            rows = cur.fetchall()
+            cur.close()
+            if len(rows) is 1:
+                if self.debug is True:
+                    print('returned from DB:')
+                    print(rows[0][0])
+                self.hostname = rows[0][0]
+            else:
+                self.hostname = False
+        else:
+            print('Missing identifier parameter')
+            exit()
+            
+    # Used to fetch fields from DB
+    def get(self, field):
+        if self.hostname is not False:
+            cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
+        
+            query = "SELECT %s FROM switches WHERE hostname = '%s' LIMIT 1" % (field, self.hostname)
+            if self.debug is True:
+                print('Query: %s' % query)
+            
+            try:
+                cur.execute(query)
+                rows = cur.fetchall()
+                
+                if len(rows) is 1:
+                    if self.debug is True:
+                        print('returned from DB:')
+                        print(rows[0][0])
+                    return rows[0][0]
+                else:
+                    if self.debug is True:
+                        print('No data found - field: %s' % field)
+                    return False
+            except psycopg2.ProgrammingError:
+                print('Field (%s) not found' % field)
+                conn.rollback() # Prevents DB from locking up the next queries - http://initd.org/psycopg/docs/connection.html#connection.rollback
+                return False
+        else:
+            print('identifiers (%s) not found' % self.identifiers)
+            return False
+            
+    # Used to set fields in DB
+    def set(self, field, value):
+        if self.hostname is not False:
+            cur = conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
+            query = "UPDATE switches SET %s = '%s' WHERE hostname = '%s'" % (field, value, self.hostname)
+            if self.debug is True:
+                print('Query: %s' % query)
+            try:
+                cur.execute(query)
+                conn.commit()
+                return True
+            except psycopg2.ProgrammingError:
+                print('Field (%s) not found' % field)
+                conn.rollback()
+                return False
+        else:
+            print('identifiers (%s) not found' % self.identifiers)
+            return False
diff --git a/fap/dhcpd/server_dhcp.py b/fap/dhcpd/server_dhcp.py
new file mode 100755
index 0000000..592e1eb
--- /dev/null
+++ b/fap/dhcpd/server_dhcp.py
@@ -0,0 +1,360 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+'''
+server_dhcp.py by Jonas "j" Lindstad for The Gathering tech:server
+
+Used to configure the Juniper EX2200 edge switches with Zero Touch Protocol
+License: GPLv2
+
+Based on the work of psychomario - https://github.com/psychomario
+'''
+
+
+'''
+
+TODO
+
+ * try/catch around each incomming packet - prevents DHCP-server from crashing if it receives a malformed packet
+ 
+'''
+
+import socket, binascii, IN
+from module_craft_option import craft_option # Module that crafts DHCP options
+# from module_lease import lease # Module that fetches data from DB and provides data for the lease
+from module_lease import lease2 as lease # Module that fetches data from DB and provides data for the lease
+
+
+# Global options - not a pretty hack
+options_raw = {} # TODO - not a nice way to do things
+option_82_1 = ''
+client = ''
+
+
+#############
+# FUNCTIONS #
+#############
+
+# Generator for each of the dhcp fields
+def split_packet(msg,slices): 
+    for x in slices:
+        yield msg[:x]
+        msg = msg[x:]
+
+# Splits a chunk of hex into a list of hex. (0123456789abcdef => ['01', '23', '45', '67', '89', 'ab', 'cd', 'ef'])
+def chunk_hex(hex):
+    return [hex[i:i+2] for i in range(0, len(hex), 2)]
+
+# Convert hex IP to string with formated decimal IP. (0a0000ff => 10.0.0.255)
+def hex_ip_to_str(hex_ip):
+    return '.'.join(str(y) for y in map(lambda x: int(x, 16), chunk_hex(hex_ip))) # cast int to str for join
+
+# formats a MAC address in the format "b827eb9a520f" to "b8:27:eb:9a:52:0f"
+def format_hex_mac(hex_mac):
+    return ':'.join(str(x) for x in chunk_hex(hex_mac))
+
+# Formats a 6 byte MAC to a readable string (b'5e\x21\x00r3' => '35:65:21:00:72:33')
+def six_byte_mac_to_str(mac):
+    return ':'.join('%02x' % byte for byte in mac)
+
+# b'b827eb9a520f' => 'b8:27:eb:9a:52:0f'
+def prettyprint_hex_as_str(hex):
+    return ':'.join('%02x' % byte for byte in binascii.unhexlify(hex))
+
+# CIDR notation to subnet string ('25' => '255.255.255.128')
+def cidr_to_subnet(cidr):
+    mask = [0, 0, 0, 0]
+    for i in range(int(cidr)):
+        mask[i//8] = mask[i//8] + (1 << (7 - i % 8))
+    return '.'.join(str(x) for x in mask)
+
+# Parses DHCP options - raw = hex options
+def parse_options(raw):
+    print('[%s] --> processing DHCP options' % client)
+    chunked = chunk_hex(raw)
+    chunked_length = len(chunked)
+    pointer = 0 # counter - next option start
+    options = {} # options dataset
+    
+    global options_raw 
+    options_raw = {} # incomming request's options
+    special_options = [53, 82]
+
+    while True: # Loop over the DHCP options
+        option = int(chunked[pointer], 16) # option ID (0 => 255)
+        code = int(chunked[pointer], 16) # option code (0 => 255) # New int for options' ID with correct name. Replaces $option
+        
+        length = int(chunked[pointer+1], 16) # option length
+        option_payload = raw[((pointer+2)*2):((pointer+length+2)*2)] # Contains the payload of the option - without option ID and length
+        options_raw[code] = option_payload # copying incomming request's options, directly usable in outgoing replies
+        
+        asciivalue = binascii.unhexlify(option_payload) # should not contain unreadable characters
+        
+        if option in special_options:
+            if option is 82:
+                option82_raw = option_payload
+                options[option] = parse_suboptions(option, option_payload)
+            elif option is 53:
+                options[option] = option_payload
+                # options[option] = 1 # Not adding DHCP DISCOVER to the options list, becouse it will not be used further on
+                if int(chunked[pointer+2], 16) is 1:
+                    print('[%s]     --> option: %s: %s' % (client, option, 'DHCP Discover (will not be used in reply)'))
+                else:
+                    print('[%s]     --> option: %s: %s' % (client, option, asciivalue))
+
+        else:
+            options[option] = asciivalue
+            # TODO: Formating.... Also crap code
+            try:
+                if len(asciivalue) > 30:
+                    print('[%s]     --> option: %s: %s' % (client, option, asciivalue[:26] + ' [...]'))
+                else:
+                    print('[%s]     --> option: %s: %s' % (client, option, asciivalue))
+            except Exception:
+                if len(asciivalue) > 30:
+                    print('[%s]     --> option: %s: %s' % (client, option, prettyprint_hex_as_str(option_payload)[:26] + ' [...]'))
+                else:
+                    print('[%s]     --> option: %s: %s' % (client, option, prettyprint_hex_as_str(option_payload)))
+                pass
+
+        pointer = pointer + length + 2 # place pointer at the next options' option ID/code field
+        
+        if int(chunked[pointer], 16) is 255: # end of DHCP options - should allways last field
+            print('[%s] --> Finished processing options' % client)
+            break
+    return options
+
+# Parses suboptions
+def parse_suboptions(option, raw):
+    print('[%s]     --> processing suboption hook for option %s' % (client, option))
+    chunked = chunk_hex(raw)
+    chunked_length = len(chunked)
+    pointer = 0 # counter - next option start
+    dataset = {}
+    
+    if option is 82: # Option 82 - custom shit: Setting global variable to list
+        global option_82_1
+        
+    while True:
+        length = int(chunked[pointer+1], 16) # option length in bytes
+        value = raw[4:(length*2)+(4)]
+
+        if option is 82 and int(chunked[0], 16) is 1: # Option 82 - custom shit: Putting data in list
+            option_82_1 = binascii.unhexlify(value).decode()
+
+        print('[%s]         --> suboption %s found - value: "%s"' % (client, int(chunked[0], 16), binascii.unhexlify(value).decode())) # will fail on non-ascii characters
+        
+        dataset[int(chunked[0], 16)] = value
+        pointer = pointer + length + 2 # place pointer at the next options' option ID/code field
+        if pointer not in chunked: # end of DHCP options - allways last field
+            print('[%s]     --> Finished processing suboption %s' % (client, option))
+            break
+    return dataset
+
+# Parses and handles DHCP DISCOVER or DHCP REQUEST
+def reqparse(message):
+    data=None
+    dhcpfields=[1,1,1,1,4,2,2,4,4,4,4,6,10,192,4,message.rfind(b'\xff'),1]
+    hexmessage=binascii.hexlify(message)
+    messagesplit=[binascii.hexlify(x) for x in split_packet(message,dhcpfields)]
+    
+    global client
+    client = prettyprint_hex_as_str(messagesplit[11])
+    
+    if messagesplit[11][0:6] != b'44f477':
+        print('[%s] Client not Juniper - exiting (GIADDR: %s)' % (client, hex_ip_to_str(messagesplit[10])))
+        return False
+    
+    print('[%s] Parsing DHCP packet from client' % client)
+
+    #
+    # Logical checks to decide to whether respond or reject
+    #
+    if int(hex_ip_to_str(messagesplit[10]).replace('.', '')) is 0: # DHCP request has been forwarded by DHCP relay - A bit haxxy..
+        print('[%s] Rejecting to process DHCP packet - not forwarded by DHCP relay' % client)
+        return False
+
+
+    # Process DHCP options
+    options = parse_options(messagesplit[15])
+        
+    # Option 82 is set in the packet
+    if 82 not in options:
+        print('[%s] Rejecting to process DHCP packet - DHCP option 82 not set' % client)
+        return False
+    
+    # 1 = DHCP Discover message (DHCPDiscover).
+    # 2 = DHCP Offer message (DHCPOffer).
+    # 3 = DHCP Request message (DHCPRequest).
+    # 4 = DHCP Decline message (DHCPDecline).
+    # 5 = DHCP Acknowledgment message (DHCPAck).
+    # 6 = DHCP Negative Acknowledgment message (DHCPNak).
+    # 7 = DHCP Release message (DHCPRelease).
+    # 8 = DHCP Informational message (DHCPInform).
+
+    # Check DHCP request type
+    if options[53] == b'01':
+        mode = 'dhcp_discover'
+        print('[%s] --> DHCP packet type: DHCP DISCOVER' % client)
+    elif options[53] == b'03':
+        mode = 'dhcp_request'
+        print('[%s] --> DHCP packet type: DHCP REQUEST' % client)
+    elif options[53] == b'04':
+        print('[%s] --> DHCP packet type: DHCP DECLINE - Not implemented' % client)
+        return False
+    elif options[53] == b'05':
+        print('[%s] --> DHCP packet type: DHCP ACK - Not implemented' % client)
+        return False
+    elif options[53] == b'06':
+        print('[%s] --> DHCP packet type: DHCP NEGATIVE ACK - Not implemented' % client)
+        return False
+    elif options[53] == b'07':
+        print('[%s] --> DHCP packet type: DHCP RELEASE - Not implemented' % client)
+        return False
+    elif options[53] == b'08':
+        print('[%s] --> DHCP packet type: DHCP INFORM - Not implemented' % client)
+        return False
+    else:
+        print('[%s] Rejecting to continue process DHCP packet - option 53 missing' % client) # Small sanity check
+        return False
+    
+    
+    #
+    # Packet passes our requirements
+    #
+    print('[%s] --> DHCP packet contains option 82 - continues to process' % client)
+    print('[%s] --> DHCP packet forwarded by relay %s' % (client, hex_ip_to_str(messagesplit[10])))
+    print('[%s] --> DHCP XID/Transaction ID: %s' % (client, prettyprint_hex_as_str(messagesplit[4])))
+    
+    # Handle DB request - do DB lookup based on option 82
+    print('[%s] --> Looking up in the DB' % (client))
+    
+    option_82_1_pieces = option_82_1.split(':')
+    
+    if len(option_82_1_pieces) == 3:
+        (distro, phy, vlan) = option_82_1.split(':')
+        print('[%s]     --> Query details: distro_name:%s, distro_phy_port:%s' % (client, distro, phy.split('.')[0]))
+        
+        lease_identifiers = {'distro_name': distro, 'distro_phy_port': phy.split('.')[0]}
+        if lease(lease_identifiers).get('hostname') is not False:
+            l={
+                'hostname': lease(lease_identifiers).get('hostname'),
+                'mgmt_v4_addr': lease(lease_identifiers).get('mgmt_v4_addr'),
+                'mgmt_v4_gw': lease(lease_identifiers).get('mgmt_v4_gw'),
+                'mgmt_v4_cidr': lease(lease_identifiers).get('mgmt_v4_cidr')
+            }
+        
+            # lease_details = lease({'distro_name': distro, 'distro_phy_port': phy[:-2]}).get_dict()
+            print('[%s]     --> Data found, switch exists in DB - ready to craft response' % client)
+        else:
+            print('[%s]     --> Data not found, switch does not exists in DB' % client)
+            return False
+    elif len(option_82_1_pieces) > 0:
+        print('[%s]     --> Option 82 does not contained required syntax (<distro>:<phy_port>:<vlan>)' % client)
+        print('[%s]     --> Option 82: %s' % (client, option_82_1))
+        print('[%s] --> Ending request' % client)
+        return False
+    else:
+        print('[%s] Rejecting to continue to process DHCP packet - option 82.1 is empty' % client)
+    
+    if mode == 'dhcp_discover':
+        print('[%s] --> Crafting DHCP OFFER response' % client)
+        
+    if mode == 'dhcp_request':
+        print('[%s] --> Crafting DHCP ACK response' % client)
+        
+    print('[%s]     --> XID/Transaction ID: %s' % (client, prettyprint_hex_as_str(messagesplit[4])))
+    print('[%s]     --> Client IP: %s' % (client, l['mgmt_v4_addr']))
+    print('[%s]     --> DHCP forwarder IP: %s' % (client, l['mgmt_v4_gw']))
+    print('[%s]     --> Client MAC: %s' % (client, client))
+    
+    data = b'\x02' # Message type - boot reply
+    data += b'\x01' # Hardware type - ethernet
+    data += b'\x06' # Hardware address length - 6 octets for MAC
+    data += b'\x01' # Hops
+    data += binascii.unhexlify(messagesplit[4]) # XID / Transaction ID
+    data += b'\x00\x00' # seconds elapsed - 1 second
+    data += b'\x80\x00' # BOOTP flags - broadcast (unicast: 0x0000)
+    data += b'\x00'*4 # Client IP address
+    data += socket.inet_aton(l['mgmt_v4_addr']) # New IP to client
+    data += socket.inet_aton(dhcp_server_address) # Next server IP address
+    data += socket.inet_aton(l['mgmt_v4_gw']) # Relay agent IP - DHCP forwarder
+    data += binascii.unhexlify(messagesplit[11]) # Client MAC
+    data += b'\x00'*202 # Client hardware address padding (10) + Server hostname (64) + Boot file name (128)
+    data += b'\x63\x82\x53\x63' # Magic cookie
+    
+    #
+    # Craft DHCP options
+    #
+    print('[%s] --> Completed DHCP header structure, building DHCP options' % client)
+    
+    if mode == 'dhcp_discover':
+        print('[%s]     --> Option 53  (DHCP OFFER): 2' % client)
+        data += craft_option(53).raw_hex(b'\x02') # Option 53 - DHCP OFFER
+
+    if mode == 'dhcp_request':
+        print('[%s]     --> Option 53  (DHCP ACK): 5' % client)
+        data += craft_option(53).raw_hex(b'\x05') # Option 53 - DHCP ACK
+    
+    data += craft_option(54).bytes(socket.inet_aton(dhcp_server_address)) # Option 54 - DHCP server identifier
+    print('[%s]     --> Option 54  (DHCP server identifier): %s' % (client, dhcp_server_address))
+    
+    data += craft_option(51).raw_hex(b'\x00\x00\xa8\xc0') # Option 51 - Lease time left padded with "0"
+    print('[%s]     --> Option 51  (Lease time): %s' % (client, '43200 (12 hours)'))
+    
+    data += craft_option(1).ip(cidr_to_subnet(l['mgmt_v4_cidr'])) # Option 1 - Subnet mask
+    print('[%s]     --> Option 1   (subnet mask): %s' % (client, cidr_to_subnet(l['mgmt_v4_cidr'])))
+    
+    data += craft_option(3).ip(l['mgmt_v4_gw']) # Option 3 - Default gateway (set to DHCP forwarders IP)
+    print('[%s]     --> Option 3   (default gateway): %s' % (client, l['mgmt_v4_gw']))
+    
+    data += craft_option(150).bytes(socket.inet_aton(dhcp_server_address)) # Option 150 - TFTP Server. Used as target for the Zero Touch Protocol. Not necessarily TFTP protocol used.
+    print('[%s]     --> Option 150 (Cisco proprietary TFTP server(s)): %s' % (client, dhcp_server_address))
+    
+    # http://www.juniper.net/documentation/en_US/junos13.2/topics/concept/software-image-and-configuration-automatic-provisioning-understanding.html
+    data += craft_option(43).bytes(craft_option(0).string(target_junos_file) + craft_option(1).string('/tg-edge/' + l['hostname']) + craft_option(3).string('http')) # Option 43 - ZTP
+    print('[%s]     --> Option 43  (Vendor-specific option):' % client)
+    print('[%s]         --> Suboption 0: %s' % (client, target_junos_file))
+    print('[%s]         --> Suboption 1: %s' % (client, '/tg-edge/' + l['hostname']))
+    print('[%s]         --> Suboption 3: %s' % (client, 'http'))
+
+    data += b'\xff'
+    
+    lease(lease_identifiers).set('current_mac', client) # updates MAC in DB
+    
+    return data
+
+if __name__ == "__main__":
+    interface = b'eth0'
+    dhcp_server_address = '185.12.59.11'
+    target_junos_file = '/files/jinstall-ex-2200-14.1X53-D15.2-domestic-signed.tgz'
+    
+    # Setting up the server, and how it will communicate    
+    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # IPv4 UDP socket
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+    s.setsockopt(socket.SOL_SOCKET, 25, interface)
+    s.bind(('', 67))
+
+    # Starting the whole loop
+    print('Starting main loop')
+    while True: #main loop
+        try:
+            message, addressf = s.recvfrom(8192)
+            # print(message)
+            if message.startswith(b'\x01'): # UDP payload is DHCP request (discover, request, release)
+                if addressf[0] == '0.0.0.0':
+                    # print('[%s] DHCP broadcast - unsupported' % client)
+                    reply_to = '<broadcast>'
+                else:
+                    print('[%s] DHCP unicast - DHCP forwarding' % client)
+                    reply_to = addressf[0] # senders (DHCP forwarders) IP
+                    # print(addressf[0])
+                    # reply_to = '10.0.0.1'
+                    data=reqparse(message) # Parse the DHCP request
+                    if data:
+                        print('[%s] --> replying to %s' % (client, reply_to))
+                        s.sendto(data, (reply_to, 67)) # Sends reply
+                        print('')
+        except KeyboardInterrupt:
+            exit()
diff --git a/fap/dhcpd/terminal.log b/fap/dhcpd/terminal.log
new file mode 100755
index 0000000..e865bd4
--- /dev/null
+++ b/fap/dhcpd/terminal.log
@@ -0,0 +1,146 @@
+j@lappie:~/git/tgmanage$ sudo python3 fap/dhcpd/server_dhcp.py
+Starting main loop
+[] DHCP unicast - DHCP forwarding
+[40:b4:f0:cc:76:01] Parsing DHCP packet from client
+[40:b4:f0:cc:76:01] --> processing DHCP options
+[40:b4:f0:cc:76:01]     --> option: 53: DHCP Discover (will not be used in reply)
+[40:b4:f0:cc:76:01]     --> option: 12: b'GP0212466317'
+[40:b4:f0:cc:76:01]     --> option: 60: 4a:75:6e:69:70:65:72:2d:65 [...]
+[40:b4:f0:cc:76:01]     --> processing suboption hook for option 82
+[40:b4:f0:cc:76:01]         --> suboption 1 found - value: "distro0gw:ge-0/0/0.0:mgmt"
+[40:b4:f0:cc:76:01]     --> Finished processing suboption 82
+[40:b4:f0:cc:76:01] --> Finished processing options
+[40:b4:f0:cc:76:01] --> DHCP packet type: DHCP DISCOVER
+[40:b4:f0:cc:76:01] --> DHCP packet contains option 82 - continues to process
+[40:b4:f0:cc:76:01] --> DHCP packet forwarded by relay 10.0.200.1
+[40:b4:f0:cc:76:01] --> DHCP XID/Transaction ID: 75:45:e1:46
+[40:b4:f0:cc:76:01] --> Looking up in the DB
+[40:b4:f0:cc:76:01]     --> Query details: distro_name:distro0gw, distro_phy_port:ge-0/0/0
+[40:b4:f0:cc:76:01]     --> Data found, switch exists in DB - ready to craft response
+[40:b4:f0:cc:76:01] --> Crafting DHCP OFFER response
+[40:b4:f0:cc:76:01]     --> XID/Transaction ID: 75:45:e1:46
+[40:b4:f0:cc:76:01]     --> Client IP: 10.0.200.101
+[40:b4:f0:cc:76:01]     --> DHCP forwarder IP: 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Client MAC: 40:b4:f0:cc:76:01
+[40:b4:f0:cc:76:01] --> Completed DHCP header structure, building DHCP options
+[40:b4:f0:cc:76:01]     --> Option 53  (DHCP OFFER): 2
+[40:b4:f0:cc:76:01]     --> Option 54  (DHCP server identifier): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 51  (Lease time): 43200 (12 hours)
+[40:b4:f0:cc:76:01]     --> Option 1   (subnet mask): 255.255.255.0
+[40:b4:f0:cc:76:01]     --> Option 3   (default gateway): 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Option 150 (Cisco proprietary TFTP server(s)): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 43  (Vendor-specific option):
+[40:b4:f0:cc:76:01]         --> Suboption 0: /files/jinstall-ex-2200-12.3R6.6-domestic-signed.tgz
+[40:b4:f0:cc:76:01]         --> Suboption 1: /tg-edge/e-00-1
+[40:b4:f0:cc:76:01]         --> Suboption 3: http
+[40:b4:f0:cc:76:01] --> replying to 10.0.100.1
+
+[40:b4:f0:cc:76:01] DHCP unicast - DHCP forwarding
+[40:b4:f0:cc:76:01] Parsing DHCP packet from client
+[40:b4:f0:cc:76:01] --> processing DHCP options
+[40:b4:f0:cc:76:01]     --> option: 54: b'\n\x00d\x02'
+[40:b4:f0:cc:76:01]     --> option: 55: b'\x033\x01\x0f\x06BC+\x96\x0c\x07*'
+[40:b4:f0:cc:76:01]     --> option: 50: b'\n\x00\xc8e'
+[40:b4:f0:cc:76:01]     --> option: 53: b'\x03'
+[40:b4:f0:cc:76:01]     --> option: 12: b'GP0212466317'
+[40:b4:f0:cc:76:01]     --> option: 60: 4a:75:6e:69:70:65:72:2d:65 [...]
+[40:b4:f0:cc:76:01]     --> processing suboption hook for option 82
+[40:b4:f0:cc:76:01]         --> suboption 1 found - value: "distro0gw:ge-0/0/0.0:mgmt"
+[40:b4:f0:cc:76:01]     --> Finished processing suboption 82
+[40:b4:f0:cc:76:01] --> Finished processing options
+[40:b4:f0:cc:76:01] --> DHCP packet type: DHCP REQUEST
+[40:b4:f0:cc:76:01] --> DHCP packet contains option 82 - continues to process
+[40:b4:f0:cc:76:01] --> DHCP packet forwarded by relay 10.0.200.1
+[40:b4:f0:cc:76:01] --> DHCP XID/Transaction ID: 51:5f:00:7c
+[40:b4:f0:cc:76:01] --> Looking up in the DB
+[40:b4:f0:cc:76:01]     --> Query details: distro_name:distro0gw, distro_phy_port:ge-0/0/0
+[40:b4:f0:cc:76:01]     --> Data found, switch exists in DB - ready to craft response
+[40:b4:f0:cc:76:01] --> Crafting DHCP ACK response
+[40:b4:f0:cc:76:01]     --> XID/Transaction ID: 51:5f:00:7c
+[40:b4:f0:cc:76:01]     --> Client IP: 10.0.200.101
+[40:b4:f0:cc:76:01]     --> DHCP forwarder IP: 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Client MAC: 40:b4:f0:cc:76:01
+[40:b4:f0:cc:76:01] --> Completed DHCP header structure, building DHCP options
+[40:b4:f0:cc:76:01]     --> Option 53  (DHCP ACK): 5
+[40:b4:f0:cc:76:01]     --> Option 54  (DHCP server identifier): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 51  (Lease time): 43200 (12 hours)
+[40:b4:f0:cc:76:01]     --> Option 1   (subnet mask): 255.255.255.0
+[40:b4:f0:cc:76:01]     --> Option 3   (default gateway): 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Option 150 (Cisco proprietary TFTP server(s)): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 43  (Vendor-specific option):
+[40:b4:f0:cc:76:01]         --> Suboption 0: /files/jinstall-ex-2200-12.3R6.6-domestic-signed.tgz
+[40:b4:f0:cc:76:01]         --> Suboption 1: /tg-edge/e-00-1
+[40:b4:f0:cc:76:01]         --> Suboption 3: http
+[40:b4:f0:cc:76:01] --> replying to 10.0.100.1
+
+[40:b4:f0:cc:76:01] DHCP unicast - DHCP forwarding
+[40:b4:f0:cc:76:01] Parsing DHCP packet from client
+[40:b4:f0:cc:76:01] --> processing DHCP options
+[40:b4:f0:cc:76:01]     --> option: 53: DHCP Discover (will not be used in reply)
+[40:b4:f0:cc:76:01]     --> option: 60: 4a:75:6e:69:70:65:72:2d:65 [...]
+[40:b4:f0:cc:76:01]     --> processing suboption hook for option 82
+[40:b4:f0:cc:76:01]         --> suboption 1 found - value: "distro0gw:ge-0/0/0.0:mgmt"
+[40:b4:f0:cc:76:01]     --> Finished processing suboption 82
+[40:b4:f0:cc:76:01] --> Finished processing options
+[40:b4:f0:cc:76:01] --> DHCP packet type: DHCP DISCOVER
+[40:b4:f0:cc:76:01] --> DHCP packet contains option 82 - continues to process
+[40:b4:f0:cc:76:01] --> DHCP packet forwarded by relay 10.0.200.1
+[40:b4:f0:cc:76:01] --> DHCP XID/Transaction ID: 64:3c:98:69
+[40:b4:f0:cc:76:01] --> Looking up in the DB
+[40:b4:f0:cc:76:01]     --> Query details: distro_name:distro0gw, distro_phy_port:ge-0/0/0
+[40:b4:f0:cc:76:01]     --> Data found, switch exists in DB - ready to craft response
+[40:b4:f0:cc:76:01] --> Crafting DHCP OFFER response
+[40:b4:f0:cc:76:01]     --> XID/Transaction ID: 64:3c:98:69
+[40:b4:f0:cc:76:01]     --> Client IP: 10.0.200.101
+[40:b4:f0:cc:76:01]     --> DHCP forwarder IP: 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Client MAC: 40:b4:f0:cc:76:01
+[40:b4:f0:cc:76:01] --> Completed DHCP header structure, building DHCP options
+[40:b4:f0:cc:76:01]     --> Option 53  (DHCP OFFER): 2
+[40:b4:f0:cc:76:01]     --> Option 54  (DHCP server identifier): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 51  (Lease time): 43200 (12 hours)
+[40:b4:f0:cc:76:01]     --> Option 1   (subnet mask): 255.255.255.0
+[40:b4:f0:cc:76:01]     --> Option 3   (default gateway): 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Option 150 (Cisco proprietary TFTP server(s)): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 43  (Vendor-specific option):
+[40:b4:f0:cc:76:01]         --> Suboption 0: /files/jinstall-ex-2200-12.3R6.6-domestic-signed.tgz
+[40:b4:f0:cc:76:01]         --> Suboption 1: /tg-edge/e-00-1
+[40:b4:f0:cc:76:01]         --> Suboption 3: http
+[40:b4:f0:cc:76:01] --> replying to 10.0.100.1
+
+[40:b4:f0:cc:76:01] DHCP unicast - DHCP forwarding
+[40:b4:f0:cc:76:01] Parsing DHCP packet from client
+[40:b4:f0:cc:76:01] --> processing DHCP options
+[40:b4:f0:cc:76:01]     --> option: 54: b'\n\x00d\x02'
+[40:b4:f0:cc:76:01]     --> option: 55: b'\x033\x01\x0f\x06BC+\x96\x0c\x07*'
+[40:b4:f0:cc:76:01]     --> option: 50: b'\n\x00\xc8e'
+[40:b4:f0:cc:76:01]     --> option: 53: b'\x03'
+[40:b4:f0:cc:76:01]     --> option: 60: 4a:75:6e:69:70:65:72:2d:65 [...]
+[40:b4:f0:cc:76:01]     --> processing suboption hook for option 82
+[40:b4:f0:cc:76:01]         --> suboption 1 found - value: "distro0gw:ge-0/0/0.0:mgmt"
+[40:b4:f0:cc:76:01]     --> Finished processing suboption 82
+[40:b4:f0:cc:76:01] --> Finished processing options
+[40:b4:f0:cc:76:01] --> DHCP packet type: DHCP REQUEST
+[40:b4:f0:cc:76:01] --> DHCP packet contains option 82 - continues to process
+[40:b4:f0:cc:76:01] --> DHCP packet forwarded by relay 10.0.200.1
+[40:b4:f0:cc:76:01] --> DHCP XID/Transaction ID: 66:33:48:73
+[40:b4:f0:cc:76:01] --> Looking up in the DB
+[40:b4:f0:cc:76:01]     --> Query details: distro_name:distro0gw, distro_phy_port:ge-0/0/0
+[40:b4:f0:cc:76:01]     --> Data found, switch exists in DB - ready to craft response
+[40:b4:f0:cc:76:01] --> Crafting DHCP ACK response
+[40:b4:f0:cc:76:01]     --> XID/Transaction ID: 66:33:48:73
+[40:b4:f0:cc:76:01]     --> Client IP: 10.0.200.101
+[40:b4:f0:cc:76:01]     --> DHCP forwarder IP: 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Client MAC: 40:b4:f0:cc:76:01
+[40:b4:f0:cc:76:01] --> Completed DHCP header structure, building DHCP options
+[40:b4:f0:cc:76:01]     --> Option 53  (DHCP ACK): 5
+[40:b4:f0:cc:76:01]     --> Option 54  (DHCP server identifier): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 51  (Lease time): 43200 (12 hours)
+[40:b4:f0:cc:76:01]     --> Option 1   (subnet mask): 255.255.255.0
+[40:b4:f0:cc:76:01]     --> Option 3   (default gateway): 10.0.200.1
+[40:b4:f0:cc:76:01]     --> Option 150 (Cisco proprietary TFTP server(s)): 10.0.100.2
+[40:b4:f0:cc:76:01]     --> Option 43  (Vendor-specific option):
+[40:b4:f0:cc:76:01]         --> Suboption 0: /files/jinstall-ex-2200-12.3R6.6-domestic-signed.tgz
+[40:b4:f0:cc:76:01]         --> Suboption 1: /tg-edge/e-00-1
+[40:b4:f0:cc:76:01]         --> Suboption 3: http
+[40:b4:f0:cc:76:01] --> replying to 10.0.100.1
+
-- 
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