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Construct an Internet domain name query
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
int res_mkquery( int op,
const char * dname,
int class,
int type,
const u_char * data,
int datalen,
const u_char * newrr,
u_char * buf,
int buflen );
- op
- Usually QUERY, but it can be also IQUERY
or NS_NOTIFY_OP. Note that not all of the query types
defined in <arpa/nameser.h> are supported.
- dname
- The domain name for the query.
- class
- The class of information that you want; one of:
- C_IN — ARPA Internet.
- C_CHAOS — Chaos net (MIT).
- C_HS — Hesiod name server (MIT).
- C_ANY — any class.
You typically use C_IN.
- type
- The type of information that you want.
You typically use T_PTR, but you can use any of the
T_* constants defined in <arpa/nameser.h>.
- data
- NULL, or a pointer to resource record data.
- datalen
- The length of the data.
- newrr
- Currently unused.
This argument is intended for making update messages.
- buf
- A pointer to a buffer where the function can build the query.
- buflen
- The length of the buffer.
libsocket
Use the -l socket option to
qcc
to link against this library.
The res_mkquery() function is a low-level routine that's
used by res_query()
to construct an Internet domain name query.
This routine constructs a
standard query message and places it in buf.
It returns the size of the query, or -1 if the query is larger
than buflen.
The resolver routines are used for making, sending, and
interpreting query and reply messages with Internet domain
name servers.
Global configuration and state information used by the resolver
routines is kept in the structure _res.
For more information on the options, see
res_init().
The size of the prepared query, in bytes, or -1 if an error occurs.
- /etc/resolv.conf
- Resolver configuration file.
- LOCALDOMAIN
- When set, LOCALDOMAIN contains a domain name that overrides the
current domain name.
Unix
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
dn_comp(),
dn_expand(),
gethostbyname(),
res_init(),
res_query(),
res_querydomain(),
res_search(),
res_send()
hostname,
/etc/resolv.conf
in the Utilities Reference
Based on
RFC 974, RFC 1032, RFC 1033, RFC 1034, RFC 1035
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