Here are the raw errors with '...' denoting omitted info: abraxas@At

And here is a patch to resolve it: <div class="snippet-clipboard-content notransla

NoneType issues when using DNS file about fierce HOT 3 CLOSED

mschwager commented on July 21, 2024

NoneType issues when using DNS file

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Comments (3)

gripedthumbtacks commented on July 21, 2024

This is due to a CNAME record response without a corresponding A record. You can recreate it like so:

$ python3 fierce.py --domain keypr.com --subdomains outgoing

And you will see something like:

NS: ns-1101.awsdns-09.org. ns-1979.awsdns-55.co.uk. ns-347.awsdns-43.com. ns-731.awsdns-27.net.
SOA: ns-347.awsdns-43.com. (205.251.193.91)
Zone: failure
Wildcard: failure
Traceback (most recent call last):
  File "fierce.py", line 408, in <module>
    main()
  File "fierce.py", line 405, in main
    fierce(**vars(args))
  File "fierce.py", line 290, in fierce
    ip = ipaddress.IPv4Address(record[0].address)
  File "../dnspython-1.15.0-py3.5.egg/dns/resolver.py", line 281, in __getitem__
TypeError: 'NoneType' object is not subscriptable

See dig output:

$ dig outgoing.keypr.com

; <<>> DiG ... <<>> outgoing.keypr.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: ...
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;outgoing.keypr.com.		IN	A

;; ANSWER SECTION:
outgoing.keypr.com.	299	IN	CNAME	u4122848.wl099.sendgrid.net.

;; AUTHORITY SECTION:
wl099.sendgrid.net.	179	IN	SOA	ns10.dnsmadeeasy.com. dns.dnsmadeeasy.com. 2009017173 43200 3600 1209600 180

;; Query time: 65 msec
;; SERVER: ...)
;; WHEN: ...
;; MSG SIZE  rcvd: 145

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gripedthumbtacks commented on July 21, 2024

And here is a patch to resolve it:

--- fierce.py.orig	2017-01-03 22:23:35.948000000 -0500
+++ fierce.py	2017-01-03 22:22:51.056000000 -0500
@@ -286,8 +286,10 @@
 
         if record is None:
             continue
-
-        ip = ipaddress.IPv4Address(record[0].address)
+        try:
+            ip = ipaddress.IPv4Address(record[0].address)
+        except TypeError:
+            continue
         print("Found: {} ({})".format(url, ip))
 
         if kwargs.get('connect') and not ip.is_private:

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mschwager commented on July 21, 2024

@9Yg1rxeSeha90ZU1 thanks for the reproducible error case!

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