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DNSQUERY(1) FreeBSD General Commands Manual DNSQUERY(1)
NNAAMMEE
ddnnssqquueerryy -- query domain name servers using resolver
SSYYNNOOPPSSIISS
ddnnssqquueerryy [--nn _n_a_m_e_s_e_r_v_e_r] [--tt _t_y_p_e] [--cc _c_l_a_s_s] [--rr _r_e_t_r_y] [--pp _p_e_r_i_o_d] [--dd]
[--ss] [--vv] _h_o_s_t
DDEESSCCRRIIPPTTIIOONN
The ddnnssqquueerryy program is a general interface to nameservers via BIND
resolver library calls. The program supports queries to the nameserver
with an opcode of QUERY. This program is intended to be a replacement or
supplement to programs like nstest, nsquery and nslookup. All arguments
except for _h_o_s_t and _n_a_m_e_s_e_r_v_e_r are treated without case-sensitivity.
OOPPTTIIOONNSS
--nn _n_a_m_e_s_e_r_v_e_r
The nameserver to be used in the query. Nameservers can
appear as either Internet addresses of the form (_w_._x_._y_._z or
_x_x_x_x_:_x_x_x_x_:_x_x_x_x_:_x_x_x_x_:_x_x_x_x_:_x_x_x_x_:_x_x_x_x_:_x_x_x_x) or can appear as
domain names. (Default: as specified in _/_e_t_c_/_r_e_s_o_l_v_._c_o_n_f.)
--tt _t_y_p_e The type of resource record of interest. Types include:
_A address
_N_S nameserver
_C_N_A_M_E canonical name
_P_T_R domain name pointer
_S_O_A start of authority
_W_K_S well-known service
_H_I_N_F_O host information
_M_I_N_F_O mailbox information
_M_X mail exchange
_R_P responsible person
_M_G mail group member
_A_F_S_D_B DCE or AFS server
_A_N_Y wildcard
Note that any case may be used. (Default: _A_N_Y.)
--cc _c_l_a_s_s The class of resource records of interest. Classes include:
_I_N Internet
_H_S Hesiod
_C_H_A_O_S Chaos
_A_N_Y wildcard
Note that any case may be used. (Default: _I_N.)
--rr _r_e_t_r_y The number of times to retry if the nameserver is not
responding. (Default: 4.)
--pp _p_e_r_i_o_d Period to wait before timing out. (Default: RES_TIMEOUT.)
--dd Turn on debugging. This sets the RES_DEBUG bit of the
resolver's _o_p_t_i_o_n_s field. (Default: no debugging.)
--ss Use a _s_t_r_e_a_m rather than a packet. This uses a TCP stream
connection with the nameserver rather than a UDP datagram.
This sets the RES_USEVC bit of the resolver's _o_p_t_i_o_n_s field.
(Default: UDP datagram.)
--vv Synonym for the ``--ss'' flag.
_h_o_s_t The name of the host (or domain) of interest.
FFIILLEESS
/etc/resolv.conf to get the default ns and search lists
<arpa/nameser.h> list of usable RR types and classes
<resolv.h> list of resolver flags
DDIIAAGGNNOOSSTTIICCSS
If the resolver fails to answer the query and debugging has not been
turned on, ddnnssqquueerryy will simply print a message like:
Query failed (rc = 1): Unknown host
The value of the return code is supplied by _h___e_r_r_n_o.
SSEEEE AALLSSOO
nslookup(8), nstest(1), nsquery(1), named(8), resolver(5).
AAUUTTHHOORR
Bryan Beecher
BBUUGGSS
Queries of a class other than _I_N can have interesting results since ordi-
narily a nameserver only has a list of root nameservers for class _I_N
resource records.
DDnnssqquueerryy uses a call to iinneett__aaddddrr() to determine if the argument for the
``--nn'' option is a valid Internet address. Unfortunately, iinneett__aaddddrr()
seems to cause a segmentation fault with some (bad) IP addresses (e.g.,
1.2.3.4.5).
4th Berkeley Distribution March 10, 1990 4th Berkeley Distribution
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