GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  ARES_CREATE_QUERY (3)

NAME

ares_create_query - Compose a single-question DNS query buffer

CONTENTS

Synopsis
Description
Return Values
Availability
See Also
Author

SYNOPSIS


#include <ares.h> 

int ares_create_query(const char *name, int dnsclass, int type, unsigned short id, int rd, unsigned char **buf, int *buflen, int max_udp_size)

DESCRIPTION

The ares_create_query 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. The parameter max_udp_size should be nonzero to activate EDNS. Usage of ares_create_query(3) with max_udp_size set to zero is equivalent to ares_mkquery(3).

RETURN VALUES

ares_create_query can return any of the following values:
ARES_SUCCESS Construction of the DNS query succeeded.
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.

AVAILABILITY

Added in c-ares 1.10.0

SEE ALSO

ares_expand_name(3), ares_free_string(3)

AUTHOR

Search for    or go to Top of page |  Section 3 |  Main Index


--> ARES_CREATE_QUERY (3) 17 Aug 2012

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.