add libuv support

Author: certxlm

examples/async-uv-get-ip.py

@@ -0,0 +1,88 @@
+#!/usr/bin/env python
+#
+
+"""
+get-ip.py: resolve given DNS names into IP addresses. The -s switch
+constains answers to only ones secured by DNSSEC. The -4 switch only
+returns IPv4 addresses, the -6 switch only IPv6 addresses.
+
+An example run:
+$ python async-get-ip.py www.panix.com www.isoc.org www.verisignlabs.com
+
+submitted query for www.panix.com
+submitted query for www.isoc.org
+submitted query for www.verisignlabs.com
+www.panix.com: IPv4 166.84.62.125
+www.panix.com: IPv4 166.84.62.253
+www.verisignlabs.com: IPv4 72.13.58.64
+www.verisignlabs.com: IPv6 2620:74:13:4400::201
+www.isoc.org: IPv4 212.110.167.157
+www.isoc.org: IPv6 2001:41c8:20::19
+
+"""
+
+import getdns, sys, getopt
+
+desired_addr_type = None
+
+def cbk(type, result, userarg, tid):
+    if type == getdns.CALLBACK_COMPLETE:
+        status = result.status
+        if status == getdns.RESPSTATUS_GOOD:
+            for addr in result.just_address_answers:
+                addr_type = addr['address_type']
+                addr_data = addr['address_data']
+                if (desired_addr_type == None) or (addr_type == desired_addr_type):
+                    print("{0}: {1} {2}".format(userarg, addr_type, addr_data))
+        elif status == getdns.RESPSTATUS_NO_SECURE_ANSWERS:
+            print("{0}: No DNSSEC secured responses found".format(hostname))
+        else:
+            print("{0}: getdns.address() returned error: {1}".format(hostname, status))
+    elif type == getdns.CALLBACK_CANCEL:
+        print('Callback cancelled')
+    elif type == getdns.CALLBACK_TIMEOUT:
+        print('Query timed out')
+    else:
+        print('Unknown error')
+
+
+def usage():
+    print("""\
+Usage: get-ip.py [-s] [-4|-6] <domain1> <domain2> ...
+
+    -s: only return DNSSEC secured answers
+    -4: only return IPv4 address answers
+    -6: only return IPv6 address answers
+
+-4 and -6 are mutually exclusive. If both are specified, IPv6 wins.
+""")
+    sys.exit(1)
+
+try:
+    (options, args) = getopt.getopt(sys.argv[1:], 's46')
+except getopt.GetoptError:
+    usage()
+else:
+    if not args:
+        usage()
+
+extensions = { "return_both_v4_and_v6" : getdns.EXTENSION_TRUE }
+
+for (opt, optval) in options:
+    if opt == "-s":
+        extensions["dnssec_return_only_secure"] = getdns.EXTENSION_TRUE
+    elif opt == "-4":
+        desired_addr_type = "IPv4"
+    elif opt == "-6":
+        desired_addr_type = "IPv6"
+
+ctx = getdns.UVContext()
+tids = []
+for hostname in args:
+    try:
+        tids.append(ctx.address(name=hostname, extensions=extensions, callback='cbk', userarg=hostname))
+        print ('submitted query for {0}'.format(hostname))
+    except getdns.error as e:
+        print(str(e))
+        break
+ctx.run()