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1193. [bug] dig +besteffort parsing didn't handle packet

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truncation.  dns_message_parse() has new flag
                        DNS_MESSAGE_IGNORETRUNCATION.
This commit is contained in:
Mark Andrews
2002-02-12 02:10:33 +00:00
parent 8e17fc6ef9
commit c73c1c33ec
4 changed files with 27 additions and 17 deletions
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4
CHANGES
View File

@@ -19,7 +19,9 @@
1194. [bug] Not all duplicate zone definitions were being detected 1194. [bug] Not all duplicate zone definitions were being detected
at the named.conf checking stage. [RT #2431] at the named.conf checking stage. [RT #2431]
1193. [bug] Best effort parsing didn't handle packet truncation. 1193. [bug] dig +besteffort parsing didn't handle packet
truncation. dns_message_parse() has new flag
DNS_MESSAGE_IGNORETRUNCATION.
1192. [bug] The seconds fields in LOC records were restricted 1192. [bug] The seconds fields in LOC records were restricted
to three decimal places. More decimal places should to three decimal places. More decimal places should

6
bin/dig/dighost.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: dighost.c,v 1.238 2001/11/30 01:58:39 gson Exp $ */ /* $Id: dighost.c,v 1.239 2002/02/12 02:10:30 marka Exp $ */
/* /*
* Notice to programmers: Do not use this code as an example of how to * Notice to programmers: Do not use this code as an example of how to
@@ -2195,8 +2195,10 @@ recv_done(isc_task_t *task, isc_event_t *event) {
debug("before parse starts"); debug("before parse starts");
parseflags = DNS_MESSAGEPARSE_PRESERVEORDER; parseflags = DNS_MESSAGEPARSE_PRESERVEORDER;
if (l->besteffort) if (l->besteffort) {
parseflags |= DNS_MESSAGEPARSE_BESTEFFORT; parseflags |= DNS_MESSAGEPARSE_BESTEFFORT;
parseflags |= DNS_MESSAGEPARSE_IGNORETRUNCATION;
}
result = dns_message_parse(msg, b, parseflags); result = dns_message_parse(msg, b, parseflags);
if (result == DNS_R_RECOVERABLE) { if (result == DNS_R_RECOVERABLE) {
printf(";; Warning: Message parser reports malformed " printf(";; Warning: Message parser reports malformed "

7
lib/dns/include/dns/message.h
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: message.h,v 1.106 2002/01/22 09:07:26 bwelling Exp $ */ /* $Id: message.h,v 1.107 2002/02/12 02:10:33 marka Exp $ */
#ifndef DNS_MESSAGE_H #ifndef DNS_MESSAGE_H
#define DNS_MESSAGE_H 1 #define DNS_MESSAGE_H 1
@@ -153,6 +153,8 @@ typedef int dns_messagetextflag_t;
occurs */ occurs */
#define DNS_MESSAGEPARSE_CLONEBUFFER 0x0004 /* save a copy of the #define DNS_MESSAGEPARSE_CLONEBUFFER 0x0004 /* save a copy of the
source buffer */ source buffer */
#define DNS_MESSAGEPARSE_IGNORETRUNCATION 0x0008 /* trucation errors are
* not fatal. */
/* /*
* Control behavior of rendering * Control behavior of rendering
@@ -401,6 +403,9 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
* not be considered FORMERRs. If the entire message can be parsed, it * not be considered FORMERRs. If the entire message can be parsed, it
* will be returned and DNS_R_RECOVERABLE will be returned. * will be returned and DNS_R_RECOVERABLE will be returned.
* *
* If DNS_MESSAGEPARSE_IGNORETRUNCATION is set then return as many complete
* RR's as possible, DNS_R_RECOVERABLE will be returned.
*
* OPT and TSIG records are always handled specially, regardless of the * OPT and TSIG records are always handled specially, regardless of the
* 'preserve_order' setting. * 'preserve_order' setting.
* *

27
lib/dns/message.c
View File

@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: message.c,v 1.206 2002/02/11 02:03:23 marka Exp $ */ /* $Id: message.c,v 1.207 2002/02/12 02:10:32 marka Exp $ */
/*** /***
*** Imports *** Imports
@@ -942,7 +942,6 @@ getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
isc_boolean_t free_name; isc_boolean_t free_name;
isc_boolean_t best_effort; isc_boolean_t best_effort;
isc_boolean_t seen_problem; isc_boolean_t seen_problem;
isc_buffer_t save = *source;
section = &msg->sections[DNS_SECTION_QUESTION]; section = &msg->sections[DNS_SECTION_QUESTION];
@@ -954,7 +953,6 @@ getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
rdatalist = NULL; rdatalist = NULL;
for (count = 0; count < msg->counts[DNS_SECTION_QUESTION]; count++) { for (count = 0; count < msg->counts[DNS_SECTION_QUESTION]; count++) {
save = *source;
name = isc_mempool_get(msg->namepool); name = isc_mempool_get(msg->namepool);
if (name == NULL) if (name == NULL)
return (ISC_R_NOMEMORY); return (ISC_R_NOMEMORY);
@@ -1074,10 +1072,6 @@ getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
return (ISC_R_SUCCESS); return (ISC_R_SUCCESS);
cleanup: cleanup:
if (result == ISC_R_UNEXPECTEDEND && best_effort) {
*source = save;
result = DNS_R_RECOVERABLE;
}
if (rdataset != NULL) { if (rdataset != NULL) {
INSIST(!dns_rdataset_isassociated(rdataset)); INSIST(!dns_rdataset_isassociated(rdataset));
isc_mempool_put(msg->rdspool, rdataset); isc_mempool_put(msg->rdspool, rdataset);
@@ -1122,7 +1116,6 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
isc_boolean_t free_name, free_rdataset; isc_boolean_t free_name, free_rdataset;
isc_boolean_t preserve_order, best_effort, seen_problem; isc_boolean_t preserve_order, best_effort, seen_problem;
isc_boolean_t issigzero; isc_boolean_t issigzero;
isc_buffer_t save = *source;
preserve_order = ISC_TF(options & DNS_MESSAGEPARSE_PRESERVEORDER); preserve_order = ISC_TF(options & DNS_MESSAGEPARSE_PRESERVEORDER);
best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT); best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT);
@@ -1138,7 +1131,6 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
skip_type_search = ISC_FALSE; skip_type_search = ISC_FALSE;
free_name = ISC_FALSE; free_name = ISC_FALSE;
free_rdataset = ISC_FALSE; free_rdataset = ISC_FALSE;
save = *source;
name = isc_mempool_get(msg->namepool); name = isc_mempool_get(msg->namepool);
if (name == NULL) if (name == NULL)
@@ -1482,10 +1474,6 @@ getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
return (ISC_R_SUCCESS); return (ISC_R_SUCCESS);
cleanup: cleanup:
if (result == ISC_R_UNEXPECTEDEND && best_effort) {
*source = save;
result = DNS_R_RECOVERABLE;
}
if (free_name) if (free_name)
isc_mempool_put(msg->namepool, name); isc_mempool_put(msg->namepool, name);
if (free_rdataset) if (free_rdataset)
@@ -1504,12 +1492,14 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
isc_uint16_t tmpflags; isc_uint16_t tmpflags;
isc_buffer_t origsource; isc_buffer_t origsource;
isc_boolean_t seen_problem; isc_boolean_t seen_problem;
isc_boolean_t ignore_tc;
REQUIRE(DNS_MESSAGE_VALID(msg)); REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(source != NULL); REQUIRE(source != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE); REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE);
seen_problem = ISC_FALSE; seen_problem = ISC_FALSE;
ignore_tc = ISC_TF(options & DNS_MESSAGEPARSE_IGNORETRUNCATION);
origsource = *source; origsource = *source;
@@ -1541,6 +1531,8 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
dns_decompress_setmethods(&dctx, DNS_COMPRESS_GLOBAL14); dns_decompress_setmethods(&dctx, DNS_COMPRESS_GLOBAL14);
ret = getquestions(source, msg, &dctx, options); ret = getquestions(source, msg, &dctx, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) { if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE; seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS; ret = ISC_R_SUCCESS;
@@ -1550,6 +1542,8 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
msg->question_ok = 1; msg->question_ok = 1;
ret = getsection(source, msg, &dctx, DNS_SECTION_ANSWER, options); ret = getsection(source, msg, &dctx, DNS_SECTION_ANSWER, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) { if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE; seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS; ret = ISC_R_SUCCESS;
@@ -1558,6 +1552,8 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
return (ret); return (ret);
ret = getsection(source, msg, &dctx, DNS_SECTION_AUTHORITY, options); ret = getsection(source, msg, &dctx, DNS_SECTION_AUTHORITY, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) { if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE; seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS; ret = ISC_R_SUCCESS;
@@ -1566,6 +1562,8 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
return (ret); return (ret);
ret = getsection(source, msg, &dctx, DNS_SECTION_ADDITIONAL, options); ret = getsection(source, msg, &dctx, DNS_SECTION_ADDITIONAL, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) { if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE; seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS; ret = ISC_R_SUCCESS;
@@ -1581,6 +1579,7 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
r.length); r.length);
} }
truncated:
if ((options & DNS_MESSAGEPARSE_CLONEBUFFER) == 0) if ((options & DNS_MESSAGEPARSE_CLONEBUFFER) == 0)
isc_buffer_usedregion(&origsource, &msg->saved); isc_buffer_usedregion(&origsource, &msg->saved);
else { else {
@@ -1593,6 +1592,8 @@ dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
msg->free_saved = 1; msg->free_saved = 1;
} }
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
return (DNS_R_RECOVERABLE);
if (seen_problem == ISC_TRUE) if (seen_problem == ISC_TRUE)
return (DNS_R_RECOVERABLE); return (DNS_R_RECOVERABLE);
return (ISC_R_SUCCESS); return (ISC_R_SUCCESS);