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Description:

chksrv 0.1.0

check-service a tool to probe and check the health of network services
chksrv is a tool intended to be used in conjunction with other tools (e.g. Minitor)
to check the health and availability of network services.
One design goal was to provide flexibility of what is checked,
without the need for complex bash scripts and piping. Effectively allowing to
write one check and then validating mulitple measurements afterwards.

Installation
pip install chksrv
You need at least Python 3.7 to run chksrv.

Usage
Usage:
chksrv (-h | --help)
chksrv --version
chksrv tcp [options] [-p PARAM=VALUE]... [-e EXPR]... HOST PORT
chksrv ssl [options] [-p PARAM=VALUE]... [-e EXPR]... HOST PORT
chksrv http [options] [-p PARAM=VALUE]... [-e EXPR]... URL

Options:
-h --help Show this screen.
--version Show version.
-v --verbose Increases verbosity.
-l --log-level LEVEL Defines the log verbosity [default: WARN].
--log-file FILE Stores all log output in a file.
-p --parameter PARAM=VALUE Defines a parameter.
-e --expects EXPR Defines an expection expression.
-r --retry RETRY Defines the amount of retries [default: 3].
--timeout TIMEOUT Defines a timeout for one try in seconds [default: 10].

Modules

TCP
The TCP is one of the most basic check modules.
Its purpose is to try to establish a connection
to a standard TCP listening socket.

Parameters

ipv6:
Specifies the IPv6 behaviour. Possible values:

True only tries to connect to IPv6
False only tries to connect to IPv4
'prefer' tries to connect using IPv6 first,
and tries IPv4 if this fails (default)
'fallback' tries to connect using IPv4 first,
and falls back to IPv6 if this fails

timeout:
Specifies the socket timeout in seconds

Results

tcp.success:
True if the socket connect succeded

tcp.con.time.perf:
Fractions of seconds it took to establish
the socket connection

tcp.con.time.process:
Fractions of seconds of CPU time (system and user)
the process used to establish the socket connection

tcp.ipv6:
True if the socket was established using IPv6

SSL
The SSL module is based on the TCP module <module-tcp> and layers
a SSL/TLS handshake on top of it, using the Python3 ssl library.
All parameters and results from the TCP module are available in addition

Parameters

ssl.use_default_context:
If set to True the SSL context is created using systems defaults.
ssl.protocol and ssl.ciphers will be ignored.
(default: 'prefer')

ssl.check_hostname:
If set to True chksrv verifies if the SSL certificate commonName
matches the connected hostname. (default: False)

ssl.protocol:
SSL protocol to use. Possible values:

tls (default)
sslv2
sslv3
tlsv1
tlsv1.1
tlsv1.2

ssl.ciphers:
The cipher suite to use.
Must be a valid OpenSSL cipher suite string. (default: ALL)

ssl.verify_mode:
SSL verify mode. cf. ssl.VerifyMode (default: CERT_OPTIONAL)

ssl.verify_flags:
SSL verify flags. cf. ssl.VerifyFlags (default: VERIFY_DEFAULT)

ssl.ca:
Directory or file containing x509 certifcates of
trusted Certificate Authorities. By setting it to __sys__
chksr tries to load the system default trusted certificates.

Results

ssl.success:
True if the SSL handshake was successful

ssl.con.cert:
Parsed x509 certificate the server used to authenticate itself

ssl.con.cipher:
Negotiated cipher used to this connection

ssl.con.compression:
Compression algorithm for this connection or None

ssl.con.alpn_protocol:
ALPN protocol selected during the TLS handshake
or None

ssl.con.npn_protocol:
NPN protocol selected during the SSL/TLS handshake
or None

ssl.con.ssl_version:
Actual SSL protocol version negotiated for this connection
or None if no secure connection was established

ssl.con.server_hostname:
Hostname of the server

ssl.con.cert.matches_hostname:
True if the server hostname matches the
certificate commonName

HTTP
The HTTP module is intended to be used to check web services,
and relies on either the TCP or SSL module to establish
the underlying socket connection. Depending if the URL is
specified with http:// or https://.
Consequently all parameters from either only the TCP module or both
the TCP and SSL module are available in addition

Parameters

http.method:
HTTP method of the request. Possible values:

GET (default)
HEAD
POST
PUT
DELETE
OPTIONS
PATCH
TRACE

http.body:
Body to attach to the request. (default: None)

Results

http.success:
True if the HTTP request was successful.
(Does not evaluate the returned status code)

http.resp.status:
HTTP response status code (numeric)

http.resp.reason:
HTTP response reason (e.g. Found)

http.resp.version:
HTTP version

http.resp.body:
HTTP response body

http.resp.body_length:
Actual size of the HTTP response body.
(Does not read Content-Length header)

http.resp.header.*:
Collection of response headers, converted to lower-case snake_case.
So the header field Content-Length is available as
http.resp.header.content_length. If a header field appears multiple
times in the response header (e.g. Set-Cookie) the value
is provided as list.