ARES_MKQUERY(3) Introduction to Library Functions ARES_MKQUERY(3)
NAME
ares_mkquery - Compose a single-question DNS query buffer
SYNOPSIS
#include <ares.h>
int ares_mkquery(const char *
name, int
dnsclass, int
type,
unsigned short
id, int
rd, unsigned char **
buf,
int *
buflen)
DESCRIPTION
This function is deprecated as of c-ares 1.10, please use
ares_dns_record_create(3) instead.
The
ares_mkquery function composes a DNS query with a single
question. The parameter
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
dnsclass and
type give the class and type
of the query using the values defined in
<arpa/nameser.h>. The
parameter
id gives a 16-bit identifier for the query. The parameter
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
buf, and the length of which
will be stored in the variable pointed to by
buflen. It is the
caller's responsibility to free this buffer using
ares_free_string(3) when it is no longer needed.
Usage of
ares_mkquery(3) is deprecated, whereas the function is
equivalent to
ares_create_query(3) with
max_udp_size set to 0.
RETURN VALUES
ares_mkquery can return any of the following values:
ARES_SUCCESS Construction of the DNS query succeeded.
ARES_ENOTFOUND The query name
name refers to a
.onion domain name.
See RFC 7686.
ARES_EBADNAME The query name
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.
ARES_ENOMEM Memory was exhausted.
SEE ALSO
ares_expand_name(3),
ares_dns_record(3),
ares_free_string(3) 20 Nov 2009 ARES_MKQUERY(3)
