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Add a tool README.
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Jim Hague
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= getdns tools
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This directory contains some tools based on `getdns`.
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* `getdns_query` - a command line wrapper for `getdns`.
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* `getdns_server_mon` - test DNS server function and capabilities.
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== `getdns_query`
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`getdns_query` is a command line wrapper for `getdns` exposing the
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features of this implementation (both in the official API and the
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additional API functions).
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=== Usage
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----
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usage: getdns_query [<option> ...] \
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[@<upstream> ...] [+<extension> ...] ['{ <settings> }'] [<name>] [<type>]
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default mode: recursive, synchronous resolution of NS record
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using UDP with TCP fallback
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upstreams: @<ip>[%<scope_id>][@<port>][#<tls port>][~<tls name>][^<tsig spec>]
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<ip>@<port> may be given as <IPv4>:<port>
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or '['<IPv6>[%<scope_id>]']':<port> too
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tsig spec: [<algorithm>:]<name>:<secret in Base64>
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extensions:
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+add_warning_for_bad_dns
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+dnssec_return_status
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+dnssec_return_only_secure
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+dnssec_return_all_statuses
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+dnssec_return_validation_chain
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+dnssec_return_full_validation_chain
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+dnssec_roadblock_avoidance
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+edns_cookies
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+return_both_v4_and_v6
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+return_call_reporting
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+sit=<cookie> Send along cookie OPT with value <cookie>
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+specify_class=<class>
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+0 Clear all extensions
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settings in json dict format (like outputted by -i option).
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options:
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-a Perform asynchronous resolution (default = synchronous)
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-A address lookup (<type> is ignored)
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-B Batch mode. Schedule all messages before processing responses.
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-b <bufsize> Set edns0 max_udp_payload size
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-c Send Client Subnet privacy request
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-C <filename>
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Read settings from config file <filename>
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The getdns context will be configured with these settings
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The file must be in YAML format (with extension of '.yml')
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or JSON dict format (with extension '.conf')
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-D Set edns0 do bit
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-d clear edns0 do bit
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-e <idle_timeout> Set idle timeout in milliseconds
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-F <filename> read the queries from the specified file
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-f <filename> Read DNSSEC trust anchors from <filename>
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-G general lookup
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-H hostname lookup. (<name> must be an IP address; <type> is ignored)
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-h Print this help
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-i Print api information
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-I Interactive mode (> 1 queries on same context)
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-j Output json response dict
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-J Pretty print json response dict
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-k Print root trust anchors
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-K <pin> Pin a public key for TLS connections (can repeat)
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(should look like 'pin-sha256="E9CZ9INDbd+2eRQozYqqbQ2yXLVKB9+xcprMF+44U1g="')
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-m Set TLS authentication mode to REQUIRED
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-n Set TLS authentication mode to NONE (default)
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-o <filename> Set resolver configuration file path
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(default = /etc/resolv.conf)
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-p Pretty print response dict (default)
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-P <blocksize> Pad TLS queries to a multiple of blocksize
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(special values: 0: no padding, 1: sensible default policy)
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-q Quiet mode - don't print response
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-r Set recursing resolution type
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-R <filename> Read root hints from <filename>
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-s Set stub resolution type(default = recursing)
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-S service lookup (<type> is ignored)
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-t <timeout> Set timeout in milliseconds
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-v Print getdns release version
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-V Increase verbosity (may be used more than once)
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-x Do not follow redirects
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-X Follow redirects (default)
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-0 Append suffix to single label first (default)
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-W Append suffix always
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-1 Append suffix only to single label after failure
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-M Append suffix only to multi label name after failure
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-N Never append a suffix
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-Z <suffixes> Set suffixes with the given comma separated list
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-T Set transport to TCP only
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-O Set transport to TCP only keep connections open
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-L Set transport to TLS only keep connections open
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-E Set transport to TLS with TCP fallback only keep connections open
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-u Set transport to UDP with TCP fallback (default)
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-U Set transport to UDP only
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-l <transports> Set transport list. List can contain 1 of each of the characters
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U T L for UDP, TCP or TLS e.g 'UT' or 'LTU'
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-z <listen address>
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Listen for DNS requests on the given IP address
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<listen address> is in the same format as upstreams.
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This option can be given more than once.
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----
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== `getdns_server_mon`
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`getdns_server_mon` is a collection of DNS server tests. The tests examine
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both server function and server capability.
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`get_server_mon` can optionally be run in Monitoring mode. In this mode,
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the tool output is modified to enable it to function as a plugin for
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popular monitoring systems such as https://www.icinga.org[Icinga],
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http://naemon.github.io/[Naemon], http://www.nagios.org[Nagios],
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http://www.shinken-monitoring.org/[Shinken], http://sensuapp.org/[Sensu]
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and others.
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=== Usage
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----
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Usage: getdns_server_mon [-M] [-E] [(-u|-t|-T)] [-S] [-K <spki-pin>]
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[-v [-v [-v]]] [-V] @upstream testname [<test args>]
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-M|--monitoring Make output suitable for monitoring tools
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-E|--fail-on-dns-errors Fail on DNS error (NXDOMAIN, SERVFAIL)
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-u|--udp Use UDP transport
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-t|--tcp Use TCP transport
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-T|--tls Use TLS transport
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-S|--strict-usage-profile Use strict profile (require authentication)
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-K|--spki-pin <spki-pin> SPKI pin for TLS connections (can repeat)
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-v|--verbose Increase output verbosity
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-D|--debug Enable debugging output
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-V|--version Report GetDNS version
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spki-pin: Should look like 'pin-sha256="E9CZ9INDbd+2eRQozYqqbQ2yXLVKB9+xcprMF+44U1g="'
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upstream: @<ip>[%<scope_id][@<port>][#<tls_port>][~tls name>][^<tsig spec>]
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<ip>@<port> may be given as <IPv4>:<port> or
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'['<IPv6>[%<scope_id>]']':<port>
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tsig spec: [<algorithm>:]<name>:<secret in Base64>
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Tests:
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lookup [<name> [<type>]] Check lookup on server
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keepalive <timeout-ms> [<name> [<type>]]
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Check server support for EDNS0 keepalive in
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TCP or TLS connections
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Timeout of 0 is off.
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OOOR Check whether server delivers responses out of
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query order on a TCP or TLS connection
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qname-min Check whether server supports QNAME minimisation
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rtt [warn-ms,crit-ms] [<name> [<type>]]
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Check if server round trip time exceeds
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thresholds (default 250,500)
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dnssec-validate Check whether server does DNSSEC validation
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tls-auth [<name> [<type>]] Check authentication of TLS server
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If both a SPKI pin and authentication name are
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provided, both must authenticate for this test
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to pass.
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tls-cert-valid [warn-days,crit-days] [<name> [type]]
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Check server certificate validity, report
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warning or critical if days to expiry at
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or below thresholds (default 14,7).
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tls-padding <blocksize> [<name> [<type>]]
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Check server support for EDNS0 padding in TLS
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Special blocksize values are 0 = off,
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1 = sensible default.
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tls-1.3 Check whether server supports TLS 1.3
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Enabling monitoring mode ensures output messages and exit statuses conform
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to the requirements of monitoring plugins (www.monitoring-plugins.org).
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----
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Note that the server must currently be specified with an IPv4 or an IPv6 address.
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=== The tests
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Several tests take optional name and RR type parameters. If these are not supplied,
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default values of `getdnsapi.net` and `AAAA` are used. If the lookup returns no
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answering records, `getdns_server_mon` reports a status of WARNING.
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[%header]
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|===
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| Test name | Test description | Default connection type
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| `lookup`
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| Check a name lookup succeeds.
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| UDP with TCP fallback
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| `keepalive`
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| See if the server supports EDNS0 keepalive in TCP or TLS
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connections. Specify a non-zero timeout to set the keepalive timeout
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in milliseconds, or 0 to disable it.
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| TCP
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| `OOOR`
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| Out Of Order Responses. See if the server will send responses to
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multiple queries in a single TCP or TLS connection in a different
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order to the order of queries.
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This test is experimental, and may give false negative results.
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| TCP
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| `qname-min`
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| Does the server support QNAME minimisation?
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| UDP with TCP fallback
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|`rtt`
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| Check a lookup round trip time exceeds warning and critical levels in milliseconds.
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If thresholds are not specified, defaults of 500ms (critical) and 250ms (warning) are used.
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| UDP with TCP fallback
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|`dnssec-validate`
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| See if the server is doing DNSSEC validation.
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| UDP with TCP fallback
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|`tls-auth`
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| Check if a TLS lookup authenticates successfully. You must specify
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either a SPKI pin, an authentication name, or both. If you supply
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both, both must authenticate for the test to succeed.
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| TLS
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|`tls-cert-valid`
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| Check the server certificate against warning and critical days to
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expiry. If thresholds are not specified, defaults of 7 days
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(critical) and 14 days (warning) are used.
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| TLS
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|`tls-padding`
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| Does the server support EDNS0 padding? Specify a non-zero blocksize to set
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the padding. A padding size of 1 specifies padding of a sensible default size.
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| TLS
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|`tls-1.3`
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| Does the server support TLS 1.3? To enable this test,
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`getdns_server_mon` must be compiled with OpenSSL v1.1.1 or later.
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| TLS
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|===
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=== Exit status
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[%header]
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|===
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| Numeric value | Service Status | Status Description
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| 0
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| OK
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| The service was functioning properly
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| 1
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| WARNING
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| The service fell below a warning threshold
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|2
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| CRITICAL
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| The service was not working or fell below a critical threshold
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|3
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| UNKNOWN | Invalid arguments or an internal low-level failure
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|===
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