dnsget - DNS lookup utility
] [-c class
] [-o opt
is a simple command-line to perform DNS lookups, similar to
(1) and dig
(1). It is useable for both interactive/debugging
scenarious and in scripts. The program is implemented using udns
By default, dnsget
produces a human-readable output, similar to
alias.example.com. CNAME www.example.com.
www.example.com. A 192.168.1.1
www.example.com. MX 10 mx.example.com.
which is just sufficient to see how a given name resolves. Output format is
controllable with -v
options -- the former increases
verbosity level up to printing the whole DNS contents of all packets sent and
received, which is suitable for debugging DNS problems, while the latter
reduces the level, making output more quiet, up to bare result with no error
messages, which is good for scripts.
The following options are recognized by dnsget
- produce more detailed output. More -v's means more
details will be produced. With single -v,dnsget will print
contents of all received DNS packets (in a readable format), while with
-vv, it will output all outgoing DNS packets too.
- the opposite for -v -- produce less detailed output.
With single -q,dnsget will only show (decoded) data from
final DNS resource records (RR), while -qq also suppresses error
- -t type
- request record(s) of the given type type. By
default, dnsget will ask for IPv4 address (A) record, or for PTR
record if the argument in question is an IPv4 or IPv6 address. Recognized
types include A, AAAA, MX, TXT, CNAME, PTR, NS, SOA, ANY and others.
- -c class
- request DNS record(s) of the given class class. By
default dnsget uses IN class. Valid classes include IN, CH, HS,
- (compatibility option). Equivalent to setting query type to
ANY and increasing verbosity level (-v).
- -o opt,opt,...
- (may be specified several times). Set resolver options (in
a form option:value) as if they were set in
$RES_OPTIONS environment variable, or set query flags:
- Set initial query timeout to sec.
- (re)try every query num times before failing.
- set DNS UDP buffer size to bytes bytes. Valid values
are from 512 to 65535. If bytes is greather than 512, EDNS0 (RFC
2671) extensions will be used.
- Use given UDP port number num instead of the default
port 53 (domain).
- set AA (auth only) query bit.
- do not set RD (recursion desired) query bit (set by
- dnssec or do
- set DNSSEC OK (DO) query flag (dnsget does not
verify DNSSEC signatures, only displays them; this is set in EDNS
- set CD (checking disabled) query bit.
- -n nameserver
- Use the given nameserver(s) (may be specified more than
once) instead of the default. Using this option has the same same effect
as $NSCACHEIP or $NAMESERVERS environment variables, with
the only difference that only IPv4 addresses are recognized for now, and
it is possible to specify names (which will be resolved using default
settings) instead of IP addresses.
- print short help and exit.
When all names where resovled successefully, dnsget
exits with zero exit
status. If at least one name was not found, dnsget
will exit with
return code 100. If some other error occured during name resolution, it will
exit with code 99. In case of usage or initialization error, dnsget
will return 1.