mirror of https://github.com/c-ares/c-ares.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
2.1 KiB
75 lines
2.1 KiB
.\" |
|
.\" Copyright 1998, 2000 by the Massachusetts Institute of Technology. |
|
.\" SPDX-License-Identifier: MIT |
|
.\" |
|
.TH ARES_MKQUERY 3 "20 Nov 2009" |
|
.SH NAME |
|
ares_mkquery \- Compose a single-question DNS query buffer |
|
.SH SYNOPSIS |
|
.nf |
|
#include <ares.h> |
|
|
|
int ares_mkquery(const char *\fIname\fP, int \fIdnsclass\fP, int \fItype\fP, |
|
unsigned short \fIid\fP, int \fIrd\fP, unsigned char **\fIbuf\fP, |
|
int *\fIbuflen\fP) |
|
.fi |
|
.SH DESCRIPTION |
|
Deprecated function. See \fIares_create_query(3)\fP instead! |
|
|
|
The |
|
.B ares_mkquery |
|
function composes a DNS query with a single question. |
|
The parameter |
|
.I name |
|
gives the query name as a NUL-terminated C string of period-separated |
|
labels optionally ending with a period; periods and backslashes within |
|
a label must be escaped with a backlash. The parameters |
|
.I dnsclass |
|
and |
|
.I type |
|
give the class and type of the query using the values defined in |
|
.BR <arpa/nameser.h> . |
|
The parameter |
|
.I id |
|
gives a 16-bit identifier for the query. The parameter |
|
.I rd |
|
should be nonzero if recursion is desired, zero if not. The query |
|
will be placed in an allocated buffer, a pointer to which will be |
|
stored in the variable pointed to by |
|
.IR buf , |
|
and the length of which will be stored in the variable pointed to by |
|
.IR buflen . |
|
It is the caller's responsibility to free this buffer using |
|
\fIares_free_string(3)\fP when it is no longer needed. |
|
|
|
Usage of \fIares_mkquery(3)\fP is deprecated, whereas the function is |
|
equivalent to \fIares_create_query(3)\fP with \fBmax_udp_size\fP set to |
|
0. |
|
|
|
.SH RETURN VALUES |
|
.B ares_mkquery |
|
can return any of the following values: |
|
.TP 15 |
|
.B ARES_SUCCESS |
|
Construction of the DNS query succeeded. |
|
.TP 15 |
|
.B ARES_ENOTFOUND |
|
The query name |
|
.I name |
|
refers to a |
|
.I .onion |
|
domain name. See RFC 7686. |
|
.TP 15 |
|
.B ARES_EBADNAME |
|
The query name |
|
.I name |
|
could not be encoded as a domain name, either because it contained a |
|
zero-length label or because it contained a label of more than 63 |
|
characters. |
|
.TP 15 |
|
.B ARES_ENOMEM |
|
Memory was exhausted. |
|
.SH SEE ALSO |
|
.BR ares_expand_name (3), |
|
.BR ares_dns_record (3), |
|
.BR ares_free_string (3)
|
|
|