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_EXPAND_NAME(3) Library Functions Manual ARES_EXPAND_NAME(3)NAME
ares_expand_name - Expand a DNS-encoded domain name
SYNOPSIS
#include <ares.h>
int ares_expand_name(const unsigned char *encoded,
const unsigned char *abuf, int alen, char **s,
long *enclen)
DESCRIPTION
The ares_expand_name function converts a DNS-encoded domain name to a dot-separated C string. The argument encoded gives the beginning of
the encoded domain name, and the arguments abuf and alen give the containing message buffer (necessary for the processing of indirection
pointers within the encoded domain name). The result is placed in a NUL-terminated allocated buffer, a pointer to which is stored in the
variable pointed to by s. The length of the encoded name is stored in the variable pointed to by enclen so that the caller can advance
past the encoded domain name to read further data in the message.
Use ares_free_string(3) to free the allocated hostname.
RETURN VALUES
ares_expand_name can return any of the following values:
ARES_SUCCESS Expansion of the encoded name succeeded.
ARES_EBADNAME The encoded domain name was malformed and could not be expanded.
ARES_ENOMEM Memory was exhausted.
SEE ALSO ares_mkquery(3),ares_free_string(3)AUTHOR
Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.
20 Nov 2009 ARES_EXPAND_NAME(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)