search

michaelhagans / paping

Automatically exported from code.google.com/p/paping
MIT License
0 stars 0 forks source link

Incorrectly reports "Connection timed out" when querying a closed port #22

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
What steps will reproduce the problem?
1. Query a port on localhost that is closed but not filtered.
2. Use tcpdump or similar to observe returning RST messages
3. Note that the output of the tool does not reflect that a packet was 
returned, but instead reports a timeout.

What is the expected output? What do you see instead?

When a port is closed and the remote system responds to the connection request 
with an RST packet, the output should indicate the fact that a response was 
received despite the port being closed. "Connection timed out" implies that no 
response was generated and that the host may be down/firewalled.

$ ./x86-64-paping -p 65000 -c 4 localhost
paping v1.5.5 - Copyright (c) 2015 Mike Lovell

Connecting to localhost on TCP 65000:

Connection timed out
Connection timed out
Connection timed out
Connection timed out

Connection statistics:
    Attempted = 4, Connected = 0, Failed = 4 (100.00%)
Approximate connection times:
    Minimum = 0.00ms, Maximum = 0.00ms, Average = 0.00ms

tcpdump output -----------------

09:44:44.860355 IP 127.0.0.1.54156 > 127.0.0.1.65000: Flags [S], seq 
3122841057, win 43690, options [mss 65495,sackOK,TS val 945914219 ecr 0,nop,0
09:44:44.860369 IP 127.0.0.1.65000 > 127.0.0.1.54156: Flags [R.], seq 0, ack 
3122841058, win 0, length 0
09:44:45.860618 IP 127.0.0.1.54158 > 127.0.0.1.65000: Flags [S], seq 
1915727314, win 43690, options [mss 65495,sackOK,TS val 945914469 ecr 0,nop,0
09:44:45.860644 IP 127.0.0.1.65000 > 127.0.0.1.54158: Flags [R.], seq 0, ack 
1915727315, win 0, length 0
09:44:46.860954 IP 127.0.0.1.54159 > 127.0.0.1.65000: Flags [S], seq 
4105729788, win 43690, options [mss 65495,sackOK,TS val 945914719 ecr 0,nop,0
09:44:46.860981 IP 127.0.0.1.65000 > 127.0.0.1.54159: Flags [R.], seq 0, ack 
4105729789, win 0, length 0
09:44:47.861281 IP 127.0.0.1.54160 > 127.0.0.1.65000: Flags [S], seq 
4161817225, win 43690, options [mss 65495,sackOK,TS val 945914969 ecr 0,nop,0
09:44:47.861311 IP 127.0.0.1.65000 > 127.0.0.1.54160: Flags [R.], seq 0, ack 
4161817226, win 0, length 0

What version of the product are you using? On what operating system?
v1.5.5 x64 linux

Please provide any additional information below.

Original issue reported on code.google.com by a...@pack-net.co.uk on 25 Feb 2015 at 9:47