Kdig (1) Linux Manual Page

NAME

kdig: – Advanced DNS lookup utility (libknot equivalent of ISC dig)

SYNOPSIS

kdig [common-settings] [query [settings]]…

kdig -h

DESCRIPTION

This utility sends one or more DNS queries to a nameserver. Each query can have individual settings, or it can be specified globally via common-settings, which must precede query specification.

query: name | -q name | -x address | -G tapfile
common-settings, settings: [class] [type] [@server]… [options]
name: Is a domain name that is to be looked up.
server: Is a domain name or an IPv4 or IPv6 address of the nameserver to send a query to. An additional port can be specified using address:port ([address]:port for IPv6 address) or address [at] port or address#port notation. If no server is specified, the servers from /etc/resolv.conf are used.
If no arguments are provided, kdig sends NS query for the root zone.

OPTIONS

-4: Use IPv4 protocol only.
-6: Use IPv6 protocol only.
-b address: Set the source IP address of the query to address. The address must be a valid address for local interface or :: or 0.0.0.0. Optional port can be specified in the same format as server value.
-c class: Set query class (e.g. CH, CLASS4). An explicit variant of class specification. The default class is IN.
-d: Enable debug messages if any.
-h, –help: Print short help.
-k keyfile: Use TSIG or SIG-0 key stored in a file keyfile to authenticate the request. Supported file format is the same as generated by ISC dnssec-keygen. The key comprises of public (.key extension) and private part (.private extension). Either of these file names or a name without the extension can be specified as keyfile parameter.
-p port: Set nameserver port number or service name to send a query to. The default port is 53.
-q name: Set query name. An explicit variant of name specification.
-t type: Set query type (e.g. NS, IXFR=12345, TYPE65535). An explicit variant of type specification. The default type is A. It is also possible to use NOTIFY parameter to send a notify message.
-v, –version: Print program version.
-x address: Send reverse (PTR) query for IPv4 or IPv6 address. Correct name, class and type is set automatically.
-y [algo:]keyname:key: Use TSIG key with a name keyname to authenticate the request. The algo part specifies the algorithm (the default is hmac-md5) and key specifies the shared secret encoded in Base64.
-E tapfile: Export a dnstap trace of the query and response messages received to the file tapfile.
-G tapfile: Generate message output from a previously saved dnstap file tapfile.
+[no]multiline: Wrap long records to more lines and improve human readability.
+[no]short: Show record data only.
+[no]aaflag: Set AA flag.
+[no]tcflag: Set TC flag.
+[no]rdflag: Set RD flag.
+[no]recurse: Same as +[no]rdflag
+[no]raflag: Set RA flag.
+[no]zflag: Set zero flag bit.
+[no]adflag: Set AD flag.
+[no]cdflag: Set CD flag.
+[no]dnssec: Set DO flag.
+[no]all: Show all packet sections.
+[no]qr: Show query packet.
+[no]header: Show packet header.
+[no]opt: Show EDNS pseudosection.
+[no]question: Show question section.
+[no]answer: Show answer section.
+[no]authority: Show authority section.
+[no]additional: Show additional section.
+[no]tsig: Show TSIG pseudosection.
+[no]stats: Show trailing packet statistics.
+[no]class: Show DNS class.
+[no]ttl: Show TTL value.
+[no]tcp: Use TCP protocol (default is UDP for standard query and TCP for AXFR/IXFR).
+[no]fail: Stop querying next nameserver if SERVFAIL response is received.
+[no]ignore: Don’t use TCP automatically if truncated reply is received.
+[no]nsid: Request nameserver identifier (NSID).
+[no]edns=N: Use EDNS version (default is 0).
+noidn: Disable IDN transformation to ASCII and vice versa. IDNA2003 support depends on libidn availability during project building!
+generic: Use the generic representation format when printing resource record types and data.
+client=SUBN: Set EDNS client subnet SUBN=IP/prefix.
+time=T: Set wait for reply interval in seconds (default is 5 seconds). This timeout applies to each query try.
+retry=N: Set number (>=0) of UDP retries (default is 2). This doesn’t apply to AXFR/IXFR.
+bufsize=B: Set EDNS buffer size in bytes (default is 512 bytes).

NOTE

Options -k and -y cannot be used mutually.

Missing features with regard to ISC dig

Options -f and -m and query options: +split=W, +tries=T, +ndots=D, +domain=somename,+trusted-key=####, +[no]vc, +[no]search, +[no]showsearch, +[no]defname, +[no]aaonly, +[no]cmd, +[no]identify, +[no]comments, +[no]rrcomments, +[no]onesoa, +[no]besteffort, +[no]sigchase, +[no]topdown, +[no]nssearch, +[no]trace.

Per-user file configuration via ${HOME}/.digrc.

EXAMPLES

Example 1. Get A record for example.com:

# kdig example.com A
Example 2. Perform AXFR for zone example.com from the server 192.0.2.1:
# kdig example.com -t AXFR @192.0.2.1
Example 3. Get A record for example.com from 192.0.2.1 and reverse lookup for address 2001:DB8::1 from 192.0.2.2. Both using TCP protocol:
# kdig +tcp example.com -t A @192.0.2.1 -x 2001:DB8::1 @192.0.2.2

FILES

/etc/resolv.conf

AUTHOR

Daniel Salzman (www.knot-dns.cz)

Please send any bug reports or comments to knot-dns [at] labs.nic.cz

kdig (1) Linux Manual Page