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Query a local server, using search options
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
int res_search( const char * dname,
int class,
int type,
u_char * answer,
int anslen );
- dname
- The fully qualified domain name that you want to 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>.
- answer
- A pointer to a buffer where the function can store the answer to the
query.
- anslen
- The length of the buffer.
libsocket
Use the -l socket option to
qcc
to link against this library.
The res_search() routine makes an Internet domain
name search. Like res_query(),
res_search() makes a query and waits for a
response. But it also implements the default and search
rules controlled by the RES_DEFNAMES and
RES_DNSRCH options. It returns the first successful reply.
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 length of a reply message, in bytes, or -1 if an error
occurs (h_errno is set).
See herror.
- /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(),
herror(),
res_init(),
res_mkquery(),
res_query(),
res_querydomain(),
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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