ARES_MKQUERY(3) Library Functions Manual 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
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.
RETURN VALUES
ares_mkquery 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.
SEE ALSO ares_expand_name(3), ares_free_string(3)AUTHOR
Greg Hudson, MIT Information Systems
Copyright 1998, 2000 by the Massachusetts Institute of Technology.
20 Nov 2009 ARES_MKQUERY(3)
Check Out this Related Man Page
ARES_CREATE_QUERY(3) Library Functions Manual ARES_CREATE_QUERY(3)NAME
ares_create_query - Compose a single-question DNS query buffer
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
17 Aug 2012 ARES_CREATE_QUERY(3)
Hi,
in my script I need to execute the following command:
query $id 456 432
but it waits for a RETURN character from keyboard and therefore, it fails. I tried something like:
query $id 456 432 << '\n'
but, i'ts clear it is not correct. Is there any way to do this?
Thxs. (0 Replies)
Hi,
I have small query and a understanding, could you please clarify the query and correct my understanding..?
I am very big log file If i need to take a count and contained lines for a particular pattern/word i am using the grep command twice like the below.
grep -c "OutOfMemoryException"... (4 Replies)
Hi there,
I have a small question (most like a true beginners question :) ).
In a script I have a filename stored in variable (vFile). Through the an input parameter this variable gets its value (for instance cookie.txt).
Two new variables are created with the value of vFile, but with a... (2 Replies)
Hi,
just a short question:
Is a error label always equal to a error identifier?
So it does not matter if i search for an specific identifier (errpt -j) or a specific label (errpt -J)?
Regards
Ron (5 Replies)