Using check_http for https

[Gereon Kremer]

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Hello,

I'm using nagios for website monitoring and recently one of the sites
was migrated to https.
I'll abstract from the nagios config now and directly show the problem
on the plugin.

I now want to migrate the following command to https:
check_http -H <url>

What works:
wget https://<url>

What does not work (with result):
check_http -S -H <url>   (timeout)
check_http --ssl -H <url>   (timeout)
check_http --ssl=1 -H <url>   (timeout)
check_http --ssl=2 -H <url>   (SSL protocol version 2 is not supported
by your SSL library.)
check_http --ssl=3 -H <url>   (sslv3 alert handshake
failure:s3_pkt.c:1294:SSL alert number 40)
check_http -p 443 -H <url>   (timeout)

I also tried to enable sni or additionally provide the IP via -I, but
this did not change anything.
I discovered the third-party check_https plugin which actually wraps
wget. However, I'd like to use the -s option from check_http which is
not provided by check_https.

The version:
$ check_http --version
check_http v2.1.1 (monitoring-plugins 2.1.1)

The tests were executed on a debian server as root (I know that I should
not run nagios as root, but for testing this issue it seemed appropriate
.)

Best,
Gereon

- -- 
Gereon Kremer
Lehr- und Forschungsgebiet Theorie Hybrider Systeme
RWTH Aachen
Tel: +49 241 80 21243
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