| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | .\" |
| 2 | .\" Copyright 1998, 2000 by the Massachusetts Institute of Technology. |
| 3 | .\" |
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| 5 | .\" software and its documentation for any purpose and without |
| 6 | .\" fee is hereby granted, provided that the above copyright |
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| 12 | .\" M.I.T. makes no representations about the suitability of |
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| 14 | .\" without express or implied warranty. |
| 15 | .\" |
| 16 | .TH ARES_MKQUERY 3 "20 Nov 2009" |
| 17 | .SH NAME |
| 18 | ares_mkquery \- Compose a single-question DNS query buffer |
| 19 | .SH SYNOPSIS |
| 20 | .nf |
| 21 | .B #include <ares.h> |
| 22 | .PP |
| 23 | .B int ares_mkquery(const char *\fIname\fP, int \fIdnsclass\fP, int \fItype\fP, |
| 24 | .B unsigned short \fIid\fP, int \fIrd\fP, unsigned char **\fIbuf\fP, |
| 25 | .B int *\fIbuflen\fP) |
| 26 | .fi |
| 27 | .SH DESCRIPTION |
| 28 | Deprecated function. See \fIares_create_query(3)\fP instead! |
| 29 | |
| 30 | The |
| 31 | .B ares_mkquery |
| 32 | function composes a DNS query with a single question. |
| 33 | The parameter |
| 34 | .I name |
| 35 | gives the query name as a NUL-terminated C string of period-separated |
| 36 | labels optionally ending with a period; periods and backslashes within |
| 37 | a label must be escaped with a backlash. The parameters |
| 38 | .I dnsclass |
| 39 | and |
| 40 | .I type |
| 41 | give the class and type of the query using the values defined in |
| 42 | .BR <arpa/nameser.h> . |
| 43 | The parameter |
| 44 | .I id |
| 45 | gives a 16-bit identifier for the query. The parameter |
| 46 | .I rd |
| 47 | should be nonzero if recursion is desired, zero if not. The query |
| 48 | will be placed in an allocated buffer, a pointer to which will be |
| 49 | stored in the variable pointed to by |
| 50 | .IR buf , |
| 51 | and the length of which will be stored in the variable pointed to by |
| 52 | .IR buflen . |
| 53 | It is the caller's responsibility to free this buffer using |
| 54 | \fIares_free_string(3)\fP when it is no longer needed. |
| 55 | |
| 56 | Usage of \fIares_mkquery(3)\fP is deprecated, whereas the function is |
| 57 | equivalent to \fIares_create_query(3)\fP with \fBmax_udp_size\fP set to |
| 58 | 0. |
| 59 | |
| 60 | .SH RETURN VALUES |
| 61 | .B ares_mkquery |
| 62 | can return any of the following values: |
| 63 | .TP 15 |
| 64 | .B ARES_SUCCESS |
| 65 | Construction of the DNS query succeeded. |
| 66 | .TP 15 |
| 67 | .B ARES_EBADNAME |
| 68 | The query name |
| 69 | .I name |
| 70 | could not be encoded as a domain name, either because it contained a |
| 71 | zero-length label or because it contained a label of more than 63 |
| 72 | characters. |
| 73 | .TP 15 |
| 74 | .B ARES_ENOMEM |
| 75 | Memory was exhausted. |
| 76 | .SH SEE ALSO |
| 77 | .BR ares_expand_name (3), |
| 78 | .BR ares_free_string (3) |
| 79 | .SH AUTHOR |
| 80 | Greg Hudson, MIT Information Systems |
| 81 | .br |
| 82 | Copyright 1998, 2000 by the Massachusetts Institute of Technology. |