1ARES_MKQUERY(3)            Library Functions Manual            ARES_MKQUERY(3)
2
3
4

NAME

6       ares_mkquery - Compose a single-question DNS query buffer
7

SYNOPSIS

9       #include <ares.h>
10
11       int ares_mkquery(const char *name, int dnsclass, int type,
12       unsigned short id, int rd, unsigned char **buf,
13       int *buflen)
14

DESCRIPTION

16       Deprecated function. See ares_create_query(3) instead!
17
18       The  ares_mkquery function composes a DNS query with a single question.
19       The parameter name gives the query name as a NUL-terminated C string of
20       period-separated  labels  optionally  ending with a period; periods and
21       backslashes within a label must be escaped with a backlash.  The param‐
22       eters  dnsclass and type give the class and type of the query using the
23       values defined in <arpa/nameser.h>.  The parameter id  gives  a  16-bit
24       identifier for the query.  The parameter rd should be nonzero if recur‐
25       sion is desired, zero if not.  The query will be placed in an allocated
26       buffer, a pointer to which will be stored in the variable pointed to by
27       buf, and the length of which will be stored in the variable pointed  to
28       by buflen.  It is the caller's responsibility to free this buffer using
29       ares_free_string(3) when it is no longer needed.
30
31       Usage of ares_mkquery(3) is deprecated, whereas the function is equiva‐
32       lent to ares_create_query(3) with max_udp_size set to 0.
33
34

RETURN VALUES

36       ares_mkquery can return any of the following values:
37
38       ARES_SUCCESS   Construction of the DNS query succeeded.
39
40       ARES_EBADNAME  The  query  name  name  could not be encoded as a domain
41                      name, either because it contained a zero-length label or
42                      because it contained a label of more than 63 characters.
43
44       ARES_ENOMEM    Memory was exhausted.
45

SEE ALSO

47       ares_expand_name(3), ares_free_string(3)
48

AUTHOR

50       Greg Hudson, MIT Information Systems
51       Copyright 1998, 2000 by the Massachusetts Institute of Technology.
52
53
54
55                                  20 Nov 2009                  ARES_MKQUERY(3)