Show TTL in dnseval output and update README (fix #23)
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30
README.md
30
README.md
@ -100,21 +100,21 @@ dnseval is a bulk ping utility that sends an arbitrary DNS query to a give list
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of DNS servers. This script is meant for comparing response time of multiple
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DNS servers at once:
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```
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% ./dnseval.py -t AAAA -f public-v4.txt -c10 fg.weberdns.de
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server avg(ms) min(ms) max(ms) stddev(ms) lost(%) flags
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------------------------------------------------------------------------------------------------
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8.8.8.8 94.556 90.488 112.209 6.322 %0 QR -- -- RD RA AD --
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8.8.4.4 92.599 90.265 94.338 1.086 %0 QR -- -- RD RA AD --
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ns.ripe.net 92.754 91.632 93.980 0.900 %0 QR -- -- RD RA AD --
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4.2.2.1 92.703 91.869 93.298 0.482 %0 QR -- -- RD RA AD --
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4.2.2.2 93.195 91.667 94.919 1.065 %0 QR -- -- RD RA AD --
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4.2.2.3 93.118 92.076 94.835 0.835 %0 QR -- -- RD RA AD --
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4.2.2.4 94.308 92.175 103.318 3.261 %0 QR -- -- RD RA AD --
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4.2.2.5 92.650 91.643 94.460 1.002 %0 QR -- -- RD RA AD --
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209.244.0.3 92.810 89.961 94.807 1.266 %0 QR -- -- RD RA AD --
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209.244.0.4 93.127 91.962 95.970 1.227 %0 QR -- -- RD RA AD --
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195.46.39.39 92.770 90.777 93.656 0.914 %0 QR -- -- RD RA AD --
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195.46.39.40 92.903 91.280 94.914 1.147 %0 QR -- -- RD RA AD --
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% ./dnseval.py -t AAAA -f public-v4.txt -c10 yahoo.com
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server avg(ms) min(ms) max(ms) stddev(ms) lost(%) ttl flags
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------------------------------------------------------------------------------------------------------
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8.8.8.8 270.791 215.599 307.498 40.630 %0 298 QR -- -- RD RA -- --
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8.8.4.4 222.955 171.753 307.251 60.481 %10 291 QR -- -- RD RA -- --
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ns.ripe.net 174.855 160.949 187.458 10.099 %0 289 QR -- -- RD RA -- --
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4.2.2.1 172.798 163.892 189.918 7.823 %0 287 QR -- -- RD RA -- --
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4.2.2.2 178.594 169.158 184.696 5.067 %0 285 QR -- -- RD RA -- --
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4.2.2.3 153.574 138.509 173.439 12.015 %0 284 QR -- -- RD RA -- --
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4.2.2.4 153.182 141.023 162.323 6.700 %0 282 QR -- -- RD RA -- --
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4.2.2.5 154.840 141.557 163.889 7.195 %0 281 QR -- -- RD RA -- --
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209.244.0.3 156.270 147.320 161.365 3.958 %0 279 QR -- -- RD RA -- --
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209.244.0.4 159.329 151.283 163.726 3.958 %0 278 QR -- -- RD RA -- --
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195.46.39.39 171.098 163.612 181.147 5.067 %0 276 QR -- -- RD RA -- --
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195.46.39.40 175.335 160.920 185.618 8.726 %0 274 QR -- -- RD RA -- --
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```
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### Author
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96
dnseval.py
96
dnseval.py
@ -123,6 +123,7 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False, use_edns=Fal
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resolver.lifetime = timeout
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resolver.retry_servfail = 0
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flags = 0
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ttl = None
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answers = None
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if use_edns:
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resolver.use_edns(edns=0, payload=8192, ednsflags=dns.flags.edns_from_text('DO'))
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@ -166,8 +167,9 @@ def dnsping(host, server, dnsrecord, timeout, count, use_tcp=False, use_edns=Fal
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if answers is not None:
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flags = answers.response.flags
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ttl = answers.rrset.ttl
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return server, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags
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return server, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags, ttl
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def main():
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@ -223,58 +225,58 @@ def main():
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usage()
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try:
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if fromfile:
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with open(inputfilename, 'rt') as flist:
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f = flist.read().splitlines()
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else:
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f = resolvers
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if len(f) == 0:
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print("No nameserver specified")
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if fromfile:
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with open(inputfilename, 'rt') as flist:
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f = flist.read().splitlines()
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else:
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f = resolvers
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if len(f) == 0:
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print("No nameserver specified")
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f = [name.strip() for name in f]
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width = maxlen(f)
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blanks = (width - 5) * ' '
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print('server ', blanks, ' avg(ms) min(ms) max(ms) stddev(ms) lost(%) flags')
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print((84 + width) * '-')
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for server in f:
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# check if we have a valid dns server address
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if server.lstrip() == '': # deal with empty lines
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continue
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server = server.replace(' ', '')
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try:
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ipaddress.ip_address(server)
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except ValueError: # so it is not a valid IPv4 or IPv6 address, so try to resolve host name
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try:
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s = socket.getaddrinfo(server, port=None)[1][4][0]
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except OSError:
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print('Error: cannot resolve hostname:', server)
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s = None
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except:
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pass
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else:
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s = server
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f = [name.strip() for name in f]
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width = maxlen(f)
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blanks = (width - 5) * ' '
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print('server ', blanks, ' avg(ms) min(ms) max(ms) stddev(ms) lost(%) ttl flags')
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print((90 + width) * '-')
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for server in f:
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# check if we have a valid dns server address
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if server.lstrip() == '': # deal with empty lines
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continue
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server = server.replace(' ', '')
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try:
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ipaddress.ip_address(server)
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except ValueError: # so it is not a valid IPv4 or IPv6 address, so try to resolve host name
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try:
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s = socket.getaddrinfo(server, port=None)[1][4][0]
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except OSError:
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print('Error: cannot resolve hostname:', server)
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s = None
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except:
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pass
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else:
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s = server
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if not s:
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continue
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if not s:
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continue
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try:
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(s, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags) = dnsping(hostname, s, dnsrecord, waittime,
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count, use_tcp=use_tcp,
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use_edns=use_edns)
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except dns.resolver.NXDOMAIN:
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print('%s: NXDOMAIN' % (server))
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continue
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except Exception as e:
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print('%s: %s' % (server, e))
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continue
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try:
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(s, r_avg, r_min, r_max, r_stddev, r_lost_percent, flags, ttl) = dnsping(hostname, s, dnsrecord, waittime,
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count, use_tcp=use_tcp,
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use_edns=use_edns)
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except dns.resolver.NXDOMAIN:
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print('%s: NXDOMAIN' % (server))
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continue
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except Exception as e:
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print('%s: %s' % (server, e))
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continue
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s = server.ljust(width + 1)
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text_flags = flags_to_text(flags)
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print("%s %-8.3f %-8.3f %-8.3f %-8.3f %%%-3d %25s" % (
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s, r_avg, r_min, r_max, r_stddev, r_lost_percent, text_flags), flush=True)
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s = server.ljust(width + 1)
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text_flags = flags_to_text(flags)
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print("%s %-8.3f %-8.3f %-8.3f %-8.3f %%%-3d %-5.0f %21s" % (
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s, r_avg, r_min, r_max, r_stddev, r_lost_percent, ttl, text_flags), flush=True)
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except Exception as e:
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print('%s: %s' % (server, e))
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print('%s' % (server, e))
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sys.exit(1)
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