Develop Reference

Sniffing network traffic with scapy, get "Could not activate the pcap handler"

I try to sniff network adapter(TP-LINK, 0bda:b711) with python3 , But I get an OSError: Could not activate the pcap handler
from scapy.all import *
from scapy.config import conf
from scapy.layers.dot11 import Dot11
conf.use_pcap = True
def callBack(pkg):
if pkg.haslayer(Dot11):
if pkg.type == 0 and pkg.subtype == 8:
print("dBm_AntSignal=", pkg.dBm_AntSignal)
print("dBm_AntNoise=", pkg.dBm_AntNoise)
sniff(iface='wlp1s1', monitor='True', prn=callBack)
I think there is something wrong with libpcap, I want to get dBm_AntSignal and dBm_AntNoise from sniff, the code can run Macbook according to other people(you can browse my last question). Is there somebody can solve this issue ?

If you posted issue #1136 on the libpcap issues list, then you presumably somehow managed to determine that pcap_activate() returned PCAP_ERROR. If you did that by modifying the Scapy code, try modifying it further to, if pcap_activate() returns PCAP_ERROR, report the result of pcap_geterr(), in order to try to find out why, in this particular instance, pcap_activate() returned PCAP_ERROR. The problem is that PCAP_ERROR can be returned for a number of different reasons, and it's difficult if not impossible to guess which one it was.
(And then file an issue on Scapy's issue list indicating that the error message for pcap_activate() failing should be based on both the return value from pcap_activate() and, for certain errors, the result of pcap_geterr(). They should also distinguish between error returns from pcap_activate(), which are negative numbers, and warning returns from pcap_activate(), which indicate that the "pcap handler" could be activated, but something unexpected happened, and are positive numbers.)
Update:
No need to file the Scapy issue; I've already submitted a pull request for the change to fix the error reporting, and it's been merged. Apply the changes from that pull request to Scapy and try again.

Weblogic: Import messages to a Uniform Distributed Queue from exported xml file using WLST

I am trying to write a script to import messages to a Uniform Distributed queue in Weblogic using WLST but I am unable to find a solution that specifically caters to my requirement.
Let me explain the requirement:
I have error queues that store failed messages. I have exported them as an xml file (using WLST) and segregated them based on the different error code in message header into smaller xml files which need to be imported into the main queue for reprocessing(not using Admin console).
I am sure that there is something that can be done to achieve this as I am able to import the segregated xml files using the import option in Admin console which works like a charm but have no idea how it is actually being done so that it could be implemented as a script.
I have explored a few options like exporting the files as a binary SER file which works but it is not something that can be used to filter out the retryable messages only.
The wlst method importMessages() only accepts a composite datatype array. Any method to convert/create the required composite Datatype array from the xml files would also be a great solution to the issue.

I agree it is not very simple and intuitive.
You have 2 solutions :
pure WLST code
java code using JMS API
If you want to write pure WLST code here is a code sample that will help you. The code creates and publish n messages into a queue.
The buildJMSMessage() function is responsible to create a text message.
from javax.management.openmbean import CompositeData
from weblogic.jms.extensions import JMSMessageInfo, JMSMessageFactoryImpl
...
def buildJMSMessage(text):
handle = 1
state = 1
XidString = None
sequenceNumber = 1
consumerID = None
wlmessage = JMSMessageFactoryImpl.getFactory().createTextMessage(text)
destinationName = ""
bodyIncluded = True
msg = JMSMessageInfo(handle, state, XidString, sequenceNumber, consumerID, wlmessage, destinationName, bodyIncluded)
return msg
....
quanity = 10
messages = jarray.zeros(quantity,CompositeData)
for i in range(0,quantity):
messages[i] = buildJMSMessage('Test message #'+str(i)).toCompositeData()
i = i + 1
queue.importMessages(messages, False)

Converting Intersystems cache objectscript into a python function

I am accessing an Intersystems cache 2017.1.xx instance through a python process to get various attributes about the database in able to monitor the database.
One of the items I want to monitor is license usage. I wrote a objectscript script in a Terminal window to access license usage by user:
s Rset=##class(%ResultSet).%New("%SYSTEM.License.UserListAll")
s r=Rset.Execute()
s ncol=Rset.GetColumnCount()
While (Rset.Next()) {f i=1:1:ncol w !,Rset.GetData(i)}
But, I have been unable to determine how to convert this script into a Python equivalent. I am using the intersys.pythonbind3 import for connecting and accessing the cache instance. I have been able to create python functions that accessing most everything else in the instance but this one piece of data I can not figure out how to translate it to Python (3.7).

Following should work (based on the documentation):
query = intersys.pythonbind.query(database)
query.prepare_class("%SYSTEM.License","UserListAll")
query.execute();
# Fetch each row in the result set, and print the
# name and value of each column in a row:
while 1:
cols = query.fetch([None])
if len(cols) == 0: break
print str(cols[0])
Also, notice that InterSystems IRIS -- successor to the Caché now has Python as an embedded language. See more in the docs

Since the noted query "UserListAll" is not defined correctly in the library; not SqlProc. So to resolve this issue would require a ObjectScript with the query and the use of #Result set or similar in Python to get the results. So I am marking this as resolved.

Not sure which Python interface you're using for Cache/IRIS, but this Open Source 3rd party one is worth investigating for the kind of things you're trying to do:
https://github.com/chrisemunt/mg_python

Adafruit BLE python library can't list descriptors

I'm trying to use BLE library for python to communicate with one Nordic nrf51844 chipset. Because one characteristic is notification enabled, I need to enable notification from client side by setting the descriptor Client Characteristic Configuration to 0x0001. But I failed to get the descriptor with the call "characteristic.find_descriptor()" to get it. I also tried to print out all of descriptors discovered, but looks like there is no luck to get it work.
Below is the code I'm using to discover characteristics and its descriptor referred to the example of Adafruit BLE library:
def enable_notification(characteristic):
_enableDesc = characteristic.find_descriptor(CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID)
_cmd = bytearray([0x01, 0x00])
_enableDesc.write_value(_cmd)
def handle_device_message(device):
global _status
# Once connected do everything else in a try/finally to make sure the device
# is disconnected when done.
# Wait for service discovery to complete for at least the specified
# service and characteristic UUID lists. Will time out after 60 seconds
# (specify timeout_sec parameter to override).
_logger.info('Discovering services...')
device.discover([HES_SERVICE_UUID], [DATA_CHAR_UUID, STATUS_CHAR_UUID, FACTOR_CHAR_UUID])
# Find the HES service and its characteristics.
hes = device.find_service(HES_SERVICE_UUID)
dataC = hes.find_characteristic(DATA_CHAR_UUID)
statusC = hes.find_characteristic(STATUS_CHAR_UUID)
#factorC = hes.find_characteristic(FACTOR_CHAR_UUID)
dataC.list_descriptors()
statusC.list_descriptors()
enable_notification(dataC)
enable_notification(statusC)
But it always failed at "characteristic.find_descriptor()" with below error:
_enableDesc =
characteristic.find_descriptor(CLIENT_CHARACTERISTIC_CONFIG_DESCRIPTOR_UUID)
File "build/bdist.macosx-10.11-x86_64/egg/Adafruit_BluefruitLE/interfaces/gatt.py", line 98, in find_descriptor
File "build/bdist.macosx-10.11-x86_64/egg/Adafruit_BluefruitLE/corebluetooth/gatt.py", line 124, in list_descriptors
File "build/bdist.macosx-10.11-x86_64/egg/Adafruit_BluefruitLE/corebluetooth/metadata.py", line 63, in get_all
TypeError: 'NoneType' object is not iterable
I looked into the source code of library, but can't find the interface to get descriptors explicitly. Can anyone help me on this?
Thanks!

Finally I figured out by checking the API of IOS to set notification. It should be set by calling setNotify for characteristic instead of writeValue for descriptor. And for the descriptor stuff, it shows we need to wait for some time before all descriptors are discovered and returned. Might be the issue implemented with Python. Not really verified with IOS native program.
BTW, after setting the notification, we need to wait for some time as well before the device sends notification to client.
Will get a Linux box to verify the implementation with blueZ is working well.

Check Domain Availability using Boto Route53

I love using Boto API for Amazon Web Services but now I'm not capable of finding where is the error.
I'm using AWS for check domain availability and I have created a script in Python that includes the class at this link:
https://www.codatlas.com/github.com/boto/boto/develop/boto/route53/domains/layer1.py?line=67
I call the method check_domain_availability() on passing domain name:
Route53DomainsConnection.check_domain_availability('example.com',None)
but the method returns this error:
AttributeError: 'str' object has no attribute 'make_request'
I can try to pass parameters in many modes but no result.
Where am I wrong? Thanks in advance.
P.S: I use Debian wheezy and Python3.2
More on status of subdomains
I have found a method to get the status of a record just create with route53.
this is the code:
changes = ResourceRecordSets(conn, "ZONEID")
change = changes.add_change("STRING FOR ADD NEW SUBDOMAIN")
change.add_value(MY_IP)
status = changes.commit()
If print the status variable is contained the response of commit and the status:
{u'ChangeResourceRecordSetsResponse':{u'ChangeInfo': {u'Status: u'PENDING etc.....
Now i would like to be able to swhitch to another operation only if the status of subdomamin is "SYNC" but i doesn't able to access dinamically to string for check status.
I can use a while ? Can i use sleep command ? Can anyone help me over to resolve my problem ? Thanks

You don't show your code which makes it harder to debug but this line:
Route53DomainsConnection.check_domain_availability('example.com',None)
looks suspicious. It looks like you are trying to access the check_domain_availability method from the class rather than an instance of the class. I just did the following and it worked for me:
In [1]: import boto.route53.domains
In [2]: c = boto.route53.domains.connect_to_region('us-east-1')
In [3]: c.check_domain_availability('foobar.com')
Out[3]: {u'Availability': u'UNAVAILABLE'}