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-.\" Copyright (c) 1985, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)resolver.3	8.1 (Berkeley) 6/4/93
-.\"     $Id$
-.\"
-.Dd June 4, 1993
-.Dt RESOLVER 3
-.Os BSD 4.3
-.Sh NAME
-.Nm res_query ,
-.Nm res_search ,
-.Nm res_mkquery ,
-.Nm res_send ,
-.Nm res_init ,
-.Nm dn_comp ,
-.Nm dn_expand
-.Nd resolver routines
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <netinet/in.h>
-.Fd #include <arpa/nameser.h>
-.Fd #include <resolv.h>
-.Ft int
-.Fo res_query
-.Fa "const char *dname"
-.Fa "int class"
-.Fa "int type"
-.Fa "u_char *answer"
-.Fa "int anslen"
-.Fc
-.Ft int
-.Fo res_search
-.Fa "const char *dname"
-.Fa "int class"
-.Fa "int type"
-.Fa "u_char *answer"
-.Fa "int anslen"
-.Fc
-.Ft int
-.Fo res_mkquery
-.Fa "int op"
-.Fa "const char *dname"
-.Fa "int class"
-.Fa "int type"
-.Fa "const u_char *data"
-.Fa "int datalen"
-.Fa "const u_char *newrr_in"
-.Fa "u_char *buf"
-.Fa "int buflen"
-.Fc
-.Ft int
-.Fo res_send
-.Fa "const u_char *msg"
-.Fa "int msglen"
-.Fa "u_char *answer"
-.Fa "int anslen"
-.Fc
-.Ft int
-.Fn res_init 
-.Fo dn_comp
-.Fa "const char *exp_dn"
-.Fa "u_char *comp_dn"
-.Fa "int length"
-.Fa "u_char **dnptrs"
-.Fa "u_char **lastdnptr"
-.Fc
-.Ft int
-.Fo dn_expand
-.Fa "const u_char *msg"
-.Fa "const u_char *eomorig"
-.Fa "const u_char *comp_dn"
-.Fa "char *exp_dn"
-.Fa "int length"
-.Fc
-.Sh DESCRIPTION
-These routines are used for making, sending and interpreting
-query and reply messages with Internet domain name servers.
-.Pp
-Global configuration and state information that is used by the
-resolver routines is kept in the structure
-.Em _res .
-Most of the values have reasonable defaults and can be ignored.
-Options
-stored in
-.Em _res.options
-are defined in
-.Pa resolv.h
-and are as follows.
-Options are stored as a simple bit mask containing the bitwise ``or''
-of the options enabled.
-.Bl -tag -width RES_DEFNAMES
-.It Dv RES_INIT
-True if the initial name server address and default domain name are
-initialized (i.e.,
-.Fn res_init
-has been called).
-.It Dv RES_DEBUG
-Print debugging messages.
-.It Dv RES_AAONLY
-Accept authoritative answers only.
-With this option,
-.Fn res_send
-should continue until it finds an authoritative answer or finds an error.
-Currently this is not implemented.
-.It Dv RES_USEVC
-Use
-.Tn TCP
-connections for queries instead of
-.Tn UDP
-datagrams.
-.It Dv RES_STAYOPEN
-Used with
-.Dv RES_USEVC
-to keep the
-.Tn TCP
-connection open between
-queries.
-This is useful only in programs that regularly do many queries.
-.Tn UDP
-should be the normal mode used.
-.It Dv RES_IGNTC
-Unused currently (ignore truncation errors, i.e., don't retry with
-.Tn TCP ) .
-.It Dv RES_RECURSE
-Set the recursion-desired bit in queries.
-This is the default.
-.Pf ( Fn res_send
-does not do iterative queries and expects the name server
-to handle recursion.)
-.It Dv RES_DEFNAMES
-If set,
-.Fn res_search
-will append the default domain name to single-component names
-(those that do not contain a dot).
-This option is enabled by default.
-.It Dv RES_DNSRCH
-If this option is set,
-.Fn res_search
-will search for host names in the current domain and in parent domains; see
-.Xr hostname 7 .
-This is used by the standard host lookup routine
-.Xr gethostbyname 3 .
-This option is enabled by default.
-.It Dv RES_NOALIASES
-This option turns off the user level aliasing feature controlled by the
-.Dq Ev HOSTALIASES
-environment variable.  Network daemons should set this option.
-.El
-.Pp
-The
-.Fn res_init
-routine
-reads the configuration file (if any; see
-.Xr resolver 5 )
-to get the default domain name,
-search list and
-the Internet address of the local name server(s).
-If no server is configured, the host running
-the resolver is tried.
-The current domain name is defined by the hostname
-if not specified in the configuration file;
-it can be overridden by the environment variable
-.Ev LOCALDOMAIN .
-This environment variable may contain several blank-separated
-tokens if you wish to override the
-.Em "search list"
-on a per-process basis.  This is similar to the
-.Em search
-command in the configuration file.
-Another environment variable (
-.Dq Ev RES_OPTIONS
-can be set to
-override certain internal resolver options which are otherwise
-set by changing fields in the
-.Em _res
-structure or are inherited from the configuration file's
-.Em options
-command.  The syntax of the
-.Dq Ev RES_OPTIONS
-environment variable is explained in
-.Xr resolver 5 .
-Initialization normally occurs on the first call
-to one of the following routines.
-.Pp
-The
-.Fn res_query
-function provides an interface to the server query mechanism.
-It constructs a query, sends it to the local server,
-awaits a response, and makes preliminary checks on the reply.
-The query requests information of the specified
-.Fa type
-and
-.Fa class
-for the specified fully-qualified domain name
-.Fa dname .
-The reply message is left in the
-.Fa answer
-buffer with length
-.Fa anslen
-supplied by the caller.
-.Pp
-The
-.Fn res_search
-routine makes a query and awaits a response like
-.Fn res_query ,
-but in addition, it implements the default and search rules
-controlled by the
-.Dv RES_DEFNAMES
-and
-.Dv RES_DNSRCH
-options.
-It returns the first successful reply.
-.Pp
-The remaining routines are lower-level routines used by
-.Fn res_query .
-The
-.Fn res_mkquery
-function
-constructs a standard query message and places it in
-.Fa buf .
-It returns the size of the query, or \-1 if the query is
-larger than
-.Fa buflen .
-The query type
-.Fa op
-is usually
-.Dv QUERY ,
-but can be any of the query types defined in
-.Aq Pa arpa/nameser.h .
-The domain name for the query is given by
-.Fa dname .
-.Fa Newrr
-is currently unused but is intended for making update messages.
-.Pp
-The
-.Fn res_send
-routine
-sends a pre-formatted query and returns an answer.
-It will call
-.Fn res_init
-if
-.Dv RES_INIT
-is not set, send the query to the local name server, and
-handle timeouts and retries.
-The length of the reply message is returned, or
-\-1 if there were errors.
-.Pp
-The
-.Fn dn_comp
-function
-compresses the domain name
-.Fa exp_dn
-and stores it in
-.Fa comp_dn .
-The size of the compressed name is returned or \-1 if there were errors.
-The size of the array pointed to by
-.Fa comp_dn
-is given by
-.Fa length .
-The compression uses
-an array of pointers
-.Fa dnptrs
-to previously-compressed names in the current message.
-The first pointer points to
-to the beginning of the message and the list ends with
-.Dv NULL .
-The limit to the array is specified by
-.Fa lastdnptr .
-A side effect of
-.Fn dn_comp
-is to update the list of pointers for
-labels inserted into the message
-as the name is compressed.
-If
-.Em dnptr
-is
-.Dv NULL, names are not compressed.
-If
-.Fa lastdnptr
-is
-.Dv NULL ,
-the list of labels is not updated.
-.Pp
-The
-.Fn dn_expand
-entry
-expands the compressed domain name
-.Fa comp_dn
-to a full domain name
-The compressed name is contained in a query or reply message;
-.Fa msg
-is a pointer to the beginning of the message.
-The uncompressed name is placed in the buffer indicated by
-.Fa exp_dn
-which is of size
-.Fa length .
-The size of compressed name is returned or \-1 if there was an error.
-.Sh FILES
-.Bl -tag -width Pa
-/etc/resolv.conf
-The configuration file
-see
-.Xr resolver 5 .
-.El
-.Sh SEE ALSO
-.Xr gethostbyname 3 ,
-.Xr resolver 5 ,
-.Xr hostname 7 ,
-.Xr named 8
-.Pp
-.%T RFC1032 ,
-.%T RFC1033 ,
-.%T RFC1034 ,
-.%T RFC1035 ,
-.%T RFC974
-.Rs
-.%T "Name Server Operations Guide for BIND"
-.Re
-.Sh HISTORY
-The
-.Nm
-function appeared in 
-.Bx 4.3 .