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2409. [func] Only log that we disabled EDNS processing if we were

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subsequently successful.  [RT #18029]
This commit is contained in:
Mark Andrews
2008-08-06 06:11:15 +00:00
parent 9b7f024220
commit 4db36a15c5
2 changed files with 43 additions and 18 deletions
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3
CHANGES
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@@ -1,3 +1,6 @@
2409. [func] Only log that we disabled EDNS processing if we were
subsequently successful. [RT #18029]
2408. [bug] A duplicate TCP dispatch event could be sent, which 2408. [bug] A duplicate TCP dispatch event could be sent, which
could then trigger an assertion failure in could then trigger an assertion failure in
resquery_response(). [RT #18275] resquery_response(). [RT #18275]

58
lib/dns/resolver.c
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@@ -15,7 +15,7 @@
* PERFORMANCE OF THIS SOFTWARE. * PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: resolver.c,v 1.375 2008/07/24 04:54:44 jinmei Exp $ */ /* $Id: resolver.c,v 1.376 2008/08/06 06:11:15 marka Exp $ */
/*! \file */ /*! \file */
@@ -233,6 +233,12 @@ struct fetchctx {
* Number of queries that reference this context. * Number of queries that reference this context.
*/ */
unsigned int nqueries; unsigned int nqueries;
/*%
* The reason to print when logging a successful
* response to a query.
*/
const char * reason;
}; };
#define FCTX_MAGIC ISC_MAGIC('F', '!', '!', '!') #define FCTX_MAGIC ISC_MAGIC('F', '!', '!', '!')
@@ -877,6 +883,22 @@ fctx_sendevents(fetchctx_t *fctx, isc_result_t result) {
} }
} }
static inline void
log_edns(fetchctx_t *fctx) {
char domainbuf[DNS_NAME_FORMATSIZE];
if (fctx->reason == NULL)
return;
dns_name_format(&fctx->domain, domainbuf, sizeof(domainbuf));
isc_log_write(dns_lctx, DNS_LOGCATEGORY_EDNS_DISABLED,
DNS_LOGMODULE_RESOLVER, ISC_LOG_INFO,
"success resolving '%s' (in '%s'?) after %s",
fctx->info, domainbuf, fctx->reason);
fctx->reason = NULL;
}
static void static void
fctx_done(fetchctx_t *fctx, isc_result_t result) { fctx_done(fetchctx_t *fctx, isc_result_t result) {
dns_resolver_t *res; dns_resolver_t *res;
@@ -886,10 +908,16 @@ fctx_done(fetchctx_t *fctx, isc_result_t result) {
res = fctx->res; res = fctx->res;
if (result == ISC_R_SUCCESS) if (result == ISC_R_SUCCESS) {
/*%
* Log any deferred EDNS timeout messages.
*/
log_edns(fctx);
no_response = ISC_TRUE; no_response = ISC_TRUE;
else } else
no_response = ISC_FALSE; no_response = ISC_FALSE;
fctx->reason = NULL;
fctx_stopeverything(fctx, no_response); fctx_stopeverything(fctx, no_response);
LOCK(&res->buckets[fctx->bucketnum].lock); LOCK(&res->buckets[fctx->bucketnum].lock);
@@ -1379,17 +1407,6 @@ add_triededns512(fetchctx_t *fctx, isc_sockaddr_t *address) {
ISC_LIST_INITANDAPPEND(fctx->edns512, sa, link); ISC_LIST_INITANDAPPEND(fctx->edns512, sa, link);
} }
static inline void
log_edns(fetchctx_t *fctx) {
char domainbuf[DNS_NAME_FORMATSIZE];
dns_name_format(&fctx->domain, domainbuf, sizeof(domainbuf));
isc_log_write(dns_lctx, DNS_LOGCATEGORY_EDNS_DISABLED,
DNS_LOGMODULE_RESOLVER, ISC_LOG_INFO,
"too many timeouts resolving '%s' (in '%s'?): "
"disabling EDNS", fctx->info, domainbuf);
}
static isc_result_t static isc_result_t
resquery_send(resquery_t *query) { resquery_send(resquery_t *query) {
fetchctx_t *fctx; fetchctx_t *fctx;
@@ -1530,12 +1547,15 @@ resquery_send(resquery_t *query) {
!useedns) !useedns)
{ {
query->options |= DNS_FETCHOPT_NOEDNS0; query->options |= DNS_FETCHOPT_NOEDNS0;
dns_adb_changeflags(fctx->adb, dns_adb_changeflags(fctx->adb, query->addrinfo,
query->addrinfo,
DNS_FETCHOPT_NOEDNS0, DNS_FETCHOPT_NOEDNS0,
DNS_FETCHOPT_NOEDNS0); DNS_FETCHOPT_NOEDNS0);
} }
/* Sync NOEDNS0 flag in addrinfo->flags and options now */
if ((query->addrinfo->flags & DNS_FETCHOPT_NOEDNS0) != 0)
query->options |= DNS_FETCHOPT_NOEDNS0;
/* /*
* Use EDNS0, unless the caller doesn't want it, or we know that * Use EDNS0, unless the caller doesn't want it, or we know that
* the remote server doesn't like it. * the remote server doesn't like it.
@@ -1545,12 +1565,12 @@ resquery_send(resquery_t *query) {
fctx->timeouts >= (MAX_EDNS0_TIMEOUTS * 2)) && fctx->timeouts >= (MAX_EDNS0_TIMEOUTS * 2)) &&
(query->options & DNS_FETCHOPT_NOEDNS0) == 0) { (query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
query->options |= DNS_FETCHOPT_NOEDNS0; query->options |= DNS_FETCHOPT_NOEDNS0;
log_edns(fctx); fctx->reason = "disabling EDNS";
} else if ((triededns(fctx, &query->addrinfo->sockaddr) || } else if ((triededns(fctx, &query->addrinfo->sockaddr) ||
fctx->timeouts >= MAX_EDNS0_TIMEOUTS) && fctx->timeouts >= MAX_EDNS0_TIMEOUTS) &&
(query->options & DNS_FETCHOPT_NOEDNS0) == 0) { (query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
query->options |= DNS_FETCHOPT_EDNS512; query->options |= DNS_FETCHOPT_EDNS512;
FCTXTRACE("too many timeouts, setting EDNS size to 512"); fctx->reason = "reducing UDP packet size to 512";
} }
if ((query->options & DNS_FETCHOPT_NOEDNS0) == 0) { if ((query->options & DNS_FETCHOPT_NOEDNS0) == 0) {
@@ -2795,6 +2815,7 @@ fctx_timeout(isc_task_t *task, isc_event_t *event) {
FCTXTRACE("timeout"); FCTXTRACE("timeout");
if (event->ev_type == ISC_TIMEREVENT_LIFE) { if (event->ev_type == ISC_TIMEREVENT_LIFE) {
fctx->reason = NULL;
fctx_done(fctx, ISC_R_TIMEDOUT); fctx_done(fctx, ISC_R_TIMEDOUT);
} else { } else {
isc_result_t result; isc_result_t result;
@@ -3130,6 +3151,7 @@ fctx_create(dns_resolver_t *res, dns_name_t *name, dns_rdatatype_t type,
fctx->attributes = 0; fctx->attributes = 0;
fctx->spilled = ISC_FALSE; fctx->spilled = ISC_FALSE;
fctx->nqueries = 0; fctx->nqueries = 0;
fctx->reason = NULL;
dns_name_init(&fctx->nsname, NULL); dns_name_init(&fctx->nsname, NULL);
fctx->nsfetch = NULL; fctx->nsfetch = NULL;