diff --git a/README.md b/README.md index 630d746..3b307f1 100644 --- a/README.md +++ b/README.md @@ -100,21 +100,21 @@ dnseval is a bulk ping utility that sends an arbitrary DNS query to a give list of DNS servers. This script is meant for comparing response time of multiple DNS servers at once: ``` -% ./dnseval.py -t AAAA -f public-v4.txt -c10 fg.weberdns.de -server avg(ms) min(ms) max(ms) stddev(ms) lost(%) flags ------------------------------------------------------------------------------------------------- -8.8.8.8 94.556 90.488 112.209 6.322 %0 QR -- -- RD RA AD -- -8.8.4.4 92.599 90.265 94.338 1.086 %0 QR -- -- RD RA AD -- -ns.ripe.net 92.754 91.632 93.980 0.900 %0 QR -- -- RD RA AD -- -4.2.2.1 92.703 91.869 93.298 0.482 %0 QR -- -- RD RA AD -- -4.2.2.2 93.195 91.667 94.919 1.065 %0 QR -- -- RD RA AD -- -4.2.2.3 93.118 92.076 94.835 0.835 %0 QR -- -- RD RA AD -- -4.2.2.4 94.308 92.175 103.318 3.261 %0 QR -- -- RD RA AD -- -4.2.2.5 92.650 91.643 94.460 1.002 %0 QR -- -- RD RA AD -- -209.244.0.3 92.810 89.961 94.807 1.266 %0 QR -- -- RD RA AD -- -209.244.0.4 93.127 91.962 95.970 1.227 %0 QR -- -- RD RA AD -- -195.46.39.39 92.770 90.777 93.656 0.914 %0 QR -- -- RD RA AD -- -195.46.39.40 92.903 91.280 94.914 1.147 %0 QR -- -- RD RA AD -- +% ./dnseval.py -t AAAA -f public-v4.txt -c10 yahoo.com +server avg(ms) min(ms) max(ms) stddev(ms) lost(%) ttl flags +------------------------------------------------------------------------------------------------------ +8.8.8.8 270.791 215.599 307.498 40.630 %0 298 QR -- -- RD RA -- -- +8.8.4.4 222.955 171.753 307.251 60.481 %10 291 QR -- -- RD RA -- -- +ns.ripe.net 174.855 160.949 187.458 10.099 %0 289 QR -- -- RD RA -- -- +4.2.2.1 172.798 163.892 189.918 7.823 %0 287 QR -- -- RD RA -- -- +4.2.2.2 178.594 169.158 184.696 5.067 %0 285 QR -- -- RD RA -- -- +4.2.2.3 153.574 138.509 173.439 12.015 %0 284 QR -- -- RD RA -- -- +4.2.2.4 153.182 141.023 162.323 6.700 %0 282 QR -- -- RD RA -- -- +4.2.2.5 154.840 141.557 163.889 7.195 %0 281 QR -- -- RD RA -- -- +209.244.0.3 156.270 147.320 161.365 3.958 %0 279 QR -- -- RD RA -- -- +209.244.0.4 159.329 151.283 163.726 3.958 %0 278 QR -- -- RD RA -- -- +195.46.39.39 171.098 163.612 181.147 5.067 %0 276 QR -- -- RD RA -- -- +195.46.39.40 175.335 160.920 185.618 8.726 %0 274 QR -- -- RD RA -- -- ``` ### Author diff --git a/dnseval.py b/dnseval.py index a3e262e..9e10acf 100755 --- a/dnseval.py +++ b/dnseval.py @@ -123,6 +123,7 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False, use_edns=Fal resolver.lifetime = timeout resolver.retry_servfail = 0 flags = 0 + ttl = None answers = None if use_edns: resolver.use_edns(edns=0, payload=8192, ednsflags=dns.flags.edns_from_text('DO')) @@ -166,8 +167,9 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False, use_edns=Fal if answers is not None: flags = answers.response.flags + ttl = answers.rrset.ttl - return server, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags + return server, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags, ttl def main(): @@ -223,58 +225,58 @@ def main(): usage() try: - if fromfile: - with open(inputfilename, 'rt') as flist: - f = flist.read().splitlines() - else: - f = resolvers - if len(f) == 0: - print("No nameserver specified") + if fromfile: + with open(inputfilename, 'rt') as flist: + f = flist.read().splitlines() + else: + f = resolvers + if len(f) == 0: + print("No nameserver specified") - f = [name.strip() for name in f] - width = maxlen(f) - blanks = (width - 5) * ' ' - print('server ', blanks, ' avg(ms) min(ms) max(ms) stddev(ms) lost(%) flags') - print((84 + width) * '-') - for server in f: - # check if we have a valid dns server address - if server.lstrip() == '': # deal with empty lines - continue - server = server.replace(' ', '') - try: - ipaddress.ip_address(server) - except ValueError: # so it is not a valid IPv4 or IPv6 address, so try to resolve host name - try: - s = socket.getaddrinfo(server, port=None)[1][4][0] - except OSError: - print('Error: cannot resolve hostname:', server) - s = None - except: - pass - else: - s = server + f = [name.strip() for name in f] + width = maxlen(f) + blanks = (width - 5) * ' ' + print('server ', blanks, ' avg(ms) min(ms) max(ms) stddev(ms) lost(%) ttl flags') + print((90 + width) * '-') + for server in f: + # check if we have a valid dns server address + if server.lstrip() == '': # deal with empty lines + continue + server = server.replace(' ', '') + try: + ipaddress.ip_address(server) + except ValueError: # so it is not a valid IPv4 or IPv6 address, so try to resolve host name + try: + s = socket.getaddrinfo(server, port=None)[1][4][0] + except OSError: + print('Error: cannot resolve hostname:', server) + s = None + except: + pass + else: + s = server - if not s: - continue + if not s: + continue - try: - (s, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags) = dnsping(hostname, s, dnsrecord, waittime, - count, use_tcp=use_tcp, - use_edns=use_edns) - except dns.resolver.NXDOMAIN: - print('%s: NXDOMAIN' % (server)) - continue - except Exception as e: - print('%s: %s' % (server, e)) - continue + try: + (s, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags, ttl) = dnsping(hostname, s, dnsrecord, waittime, + count, use_tcp=use_tcp, + use_edns=use_edns) + except dns.resolver.NXDOMAIN: + print('%s: NXDOMAIN' % (server)) + continue + except Exception as e: + print('%s: %s' % (server, e)) + continue - s = server.ljust(width + 1) - text_flags = flags_to_text(flags) - print("%s %-8.3f %-8.3f %-8.3f %-8.3f %%%-3d %25s" % ( - s, r_avg, r_min, r_max, r_stddev, r_lost_percent, text_flags), flush=True) + s = server.ljust(width + 1) + text_flags = flags_to_text(flags) + print("%s %-8.3f %-8.3f %-8.3f %-8.3f %%%-3d %-5.0f %21s" % ( + s, r_avg, r_min, r_max, r_stddev, r_lost_percent, ttl, text_flags), flush=True) except Exception as e: - print('%s: %s' % (server, e)) + print('%s' % (server, e)) sys.exit(1)