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Use a counter instead of a flag to indicate if the resolver is in the

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process of connecting.  There's a possibility that a connect might not
have sent a completion event when another one starts, and this could cause
bad things to happen since the query would only know about one connect.
This commit is contained in:
Brian Wellington 2001-03-16 21:50:59 +00:00
parent 298273b535
commit 0d19c777ae
1 changed files with 6 additions and 6 deletions
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12
lib/dns/resolver.c
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@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: resolver.c,v 1.211 2001/03/15 02:00:15 bwelling Exp $ */
/* $Id: resolver.c,v 1.212 2001/03/16 21:50:59 bwelling Exp $ */
#include <config.h>
@ -119,6 +119,7 @@ typedef struct query {
unsigned int options;
unsigned int attributes;
unsigned int sends;
unsigned int connects;
unsigned char data[512];
} resquery_t;
@ -126,11 +127,9 @@ typedef struct query {
#define VALID_QUERY(query) ((query) != NULL && \
(query)->magic == QUERY_MAGIC)
#define RESQUERY_ATTR_CONNECTING 0x01
#define RESQUERY_ATTR_CANCELED 0x02
#define RESQUERY_CONNECTING(q) (((q)->attributes & \
RESQUERY_ATTR_CONNECTING) != 0)
#define RESQUERY_CONNECTING(q) ((q)->connects > 0)
#define RESQUERY_CANCELED(q) (((q)->attributes & \
RESQUERY_ATTR_CANCELED) != 0)
#define RESQUERY_SENDING(q) ((q)->sends > 0)
@ -729,6 +728,7 @@ fctx_query(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
query->options = options;
query->attributes = 0;
query->sends = 0;
query->connects = 0;
/*
* Note that the caller MUST guarantee that 'addrinfo' will remain
* valid until this query is canceled.
@ -823,7 +823,7 @@ fctx_query(fetchctx_t *fctx, dns_adbaddrinfo_t *addrinfo,
resquery_connected, query);
if (result != ISC_R_SUCCESS)
goto cleanup_socket;
query->attributes |= RESQUERY_ATTR_CONNECTING;
query->connects++;
QTRACE("connecting via TCP");
} else {
result = resquery_send(query);
@ -1168,7 +1168,7 @@ resquery_connected(isc_task_t *task, isc_event_t *event) {
* up doing extra work!
*/
query->attributes &= ~RESQUERY_ATTR_CONNECTING;
query->connects--;
if (RESQUERY_CANCELED(query)) {
/*