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4c208bd4
Commit
4c208bd4
authored
Jun 25, 1999
by
Michael Graff
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add dns_message_peekheader()
parent
544f5611
Changes
2
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+53
-0
lib/dns/include/dns/message.h
lib/dns/include/dns/message.h
+24
-0
lib/dns/message.c
lib/dns/message.c
+29
-0
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lib/dns/include/dns/message.h
View file @
4c208bd4
...
...
@@ -627,6 +627,30 @@ dns_message_puttemprdatalist(dns_message_t *msg, dns_rdatalist_t **item);
* *item == NULL
*/
dns_result_t
dns_message_peekheader
(
isc_buffer_t
*
source
,
dns_messageid_t
*
idp
,
unsigned
int
*
flagsp
);
/*
* Assume the remaining region of "source" is a DNS message. Peek into
* it and fill in "*idp" with the message id, and "*flagsp" with the flags.
*
* Requires:
*
* source != NULL
*
* Ensures:
*
* if (idp != NULL) *idp == message id.
*
* if (flagsp != NULL) *flagsp == message flags.
*
* Returns:
*
* DNS_R_SUCCESS -- all is well.
*
* DNS_R_UNEXPECTEDEND -- buffer doesn't contain enough for a header.
*/
ISC_LANG_ENDDECLS
#endif
/* DNS_DNS_H */
lib/dns/message.c
View file @
4c208bd4
...
...
@@ -1539,3 +1539,32 @@ dns_message_puttemprdatalist(dns_message_t *msg, dns_rdatalist_t **item)
releaserdatalist
(
msg
,
*
item
);
*
item
=
NULL
;
}
dns_result_t
dns_message_peekheader
(
isc_buffer_t
*
source
,
dns_messageid_t
*
idp
,
unsigned
int
*
flagsp
)
{
isc_region_t
r
;
isc_buffer_t
buffer
;
dns_messageid_t
id
;
unsigned
int
flags
;
REQUIRE
(
source
!=
NULL
);
buffer
=
*
source
;
isc_buffer_remaining
(
&
buffer
,
&
r
);
if
(
r
.
length
<
DNS_MESSAGE_HEADERLEN
)
return
(
DNS_R_UNEXPECTEDEND
);
id
=
isc_buffer_getuint16
(
source
);
flags
=
isc_buffer_getuint16
(
source
);
flags
&=
DNS_MESSAGE_FLAG_MASK
;
if
(
flagsp
!=
NULL
)
*
flagsp
=
flags
;
if
(
idp
!=
NULL
)
*
idp
=
id
;
return
(
DNS_R_SUCCESS
);
}
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