Timeout for echo ping does not work

[Daniel]

When using echoping for pinging to tcp/7 (echo), and the remote hosts opens the connection but does not answer, the timeout parameter does not work.

== Steps to reproduce ==

Server side:
  sudo nc -l -p 7
  do NOT type anything into it

Client side:
  echoping -t 1 127.0.0.1

Expected result:
  netcat (nc) shows some random data,
  echoping returns after 1 second with exit code 1

What happened instead:
  netcat shows some random data,
  echoping waits forever or until somthing was typed into the netcat console (in my test I waited 12 minutes). In that case, echoping prints "Timeout while reading (2 byte(s) read)" and returns with exit code 1
---
~$ time echoping -t 1 127.0.0.1
Timeout while reading (2 byte(s) read)

real 12m14.953s
user 0m0.000s
sys 0m0.008s
~$ echo $?
1
---

It seems that timeout is only used for connecting, probably also for sending, but not for receiving the answer.

In contrast, pinging to a non-existing host works perfectly:
---
~$ time echoping -t 1 1.1.1.1
Timeout while connecting

real 0m1.006s
user 0m0.004s
sys 0m0.008s
~$ time echoping -t 2 1.1.1.1
Timeout while connecting

real 0m2.006s
user 0m0.000s
sys 0m0.008s
~$
---

[Daniel (hackie)]

Sorry, I forgot to mention the version:
Version: 6.0.2-4, and also the latest from git repository

uname -a:
Linux cisgimli 3.2.0-26-generic #41-Ubuntu SMP Thu Jun 14 16:26:01 UTC 2012 i686 i686 i386 GNU/Linux

[Daniel (hackie)]

See http://stackoverflow.com/questions/384391/how-to-signal-select-to-return-immediately: signal() blocks until it received something from the socket, or until a timeout occours. We can either do the pipe trick as mentioned in the link, or we explicitly set a timeout for the select().

Attached patch does the latter.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "patch which explicitly sets timeout for the select() function" of this bug report has been identified as being a patch. The ubuntu-reviewers team has been subscribed to the bug report so that they can review the patch. In the event that this is in fact not a patch you can resolve this situation by removing the tag 'patch' from the bug report and editing the attachment so that it is not flagged as a patch. Additionally, if you are member of the ubuntu-reviewers team please also unsubscribe the team from this bug report.

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