From 4e38005e9d6d26ca7ddb16d4e0baf6c74ee8afa5 Mon Sep 17 00:00:00 2001 From: Paul Hoffman Date: Thu, 14 Oct 2021 10:49:53 -0700 Subject: [PATCH] Added examples of use_edns() --- examples/edns.py | 36 ++++++++++++++++++++++++------------ 1 file changed, 24 insertions(+), 12 deletions(-) diff --git a/examples/edns.py b/examples/edns.py index b3988851..a130f85a 100755 --- a/examples/edns.py +++ b/examples/edns.py @@ -7,30 +7,42 @@ import dns.resolver n = '.' t = dns.rdatatype.SOA -a = '199.7.83.42' # Address of l.root-servers.net +l = '199.7.83.42' # Address of l.root-servers.net +i = '149.20.1.73' # Address of ns1.isc.org, for COOKIEs q_list = [] # A query without EDNS0 -q_list.append(dns.message.make_query(n, t)) +q_list.append((l, dns.message.make_query(n, t))) # The same query, but with EDNS0 turned on with no options -q_list.append(dns.message.make_query(n, t, use_edns=0)) +q_list.append((l,dns.message.make_query(n, t, use_edns=0))) -# With an NSID option (use_edns=0 is not needed if options are specified) -q_list.append(dns.message.make_query(n, t,\ - options=[dns.edns.GenericOption(dns.edns.OptionType.NSID, b'')])) +# Use use_edns() to specify EDNS0 options, such as buffer size +this_q = dns.message.make_query(n, t) +this_q.use_edns(0, payload=2000) +q_list.append((l, this_q)) + +# With an NSID option +# use_edns=0 is not needed if options are specified) +q_list.append((l, dns.message.make_query(n, t,\ + options=[dns.edns.GenericOption(dns.edns.OptionType.NSID, b'')]))) + +# With an NSID option, but with use_edns() to specify the options +this_q = dns.message.make_query(n, t) +this_q.use_edns(0, options=[dns.edns.GenericOption(dns.edns.OptionType.NSID, b'')]) +q_list.append((l, this_q)) # With a COOKIE -q_list.append(dns.message.make_query(n, t,\ - options=[dns.edns.GenericOption(dns.edns.OptionType.COOKIE, b'0xfe11ac99bebe3322')])) +q_list.append((i, dns.message.make_query(n, t,\ + options=[dns.edns.GenericOption(dns.edns.OptionType.COOKIE, b'0xfe11ac99bebe3322')]))) # With an ECS option using dns.edns.ECSOption to form the option -q_list.append(dns.message.make_query(n, t,\ - options=[dns.edns.ECSOption('192.168.0.0', 20)])) +q_list.append((l, dns.message.make_query(n, t,\ + options=[dns.edns.ECSOption('192.168.0.0', 20)]))) -for q in q_list: - r = dns.query.udp(q, a) +for (addr, q) in q_list: + r = dns.query.udp(q, addr) if not r.options: print('No EDNS options returned') else: -- 2.47.3