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NetworkPkg/DnsDxe: Handle CNAME type responded from the name server 

v2:
* Code refine.
* For DnsCache, the minimum value of TTL is selected between CNAME and A/AAAA record.

According RFC 1034 - 3.6.2, if the query name is an alias, the name server
will include the CNAME record in the response and restart the query at the
domain name specified in the data field of the CNAME record. RFC also provides
one example server action when A query received:

Suppose a name server was processing a query with for USCISIC.ARPA, asking for
type A information, and had the following resource records:
USC-ISIC.ARPA IN CNAME C.ISI.EDU
C.ISI.EDU     IN A     10.0.0.52
Both of these RRs would be returned in the response to the type A query.

Currently, DnsDxe driver doesn't handle the CNAME type response, which will cause
any exception result. The driver need continue the packet parsing while CNAME type
record parsed. So, this patch is used to handle it correctly.

Cc: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Fu Siyuan <siyuan.fu@intel.com>
Tested-by: Hegde Nagaraj P <nagaraj-p.hegde@hpe.com>
This commit is contained in:
Jiaxin Wu 2016-09-06 11:23:38 +08:00
parent ec68dc2855
commit 3093f45c44
1 changed files with 52 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
NetworkPkg/DnsDxe/DnsImpl.c
View File

@ -1127,6 +1127,7 @@ ParseDnsResponse (
UINT32 IpCount;
UINT32 RRCount;
UINT32 AnswerSectionNum;
UINT32 CNameTtl;
EFI_IPv4_ADDRESS *HostAddr4;
EFI_IPv6_ADDRESS *HostAddr6;
@ -1148,6 +1149,7 @@ ParseDnsResponse (
IpCount = 0;
RRCount = 0;
AnswerSectionNum = 0;
CNameTtl = 0;
HostAddr4 = NULL;
HostAddr6 = NULL;
@ -1234,13 +1236,6 @@ ParseDnsResponse (
goto ON_EXIT;
}
//
// Free the sending packet.
//
if (Item->Value != NULL) {
NetbufFree ((NET_BUF *) (Item->Value));
}
//
// Do some buffer allocations.
//
@ -1290,12 +1285,12 @@ ParseDnsResponse (
//
Dns6TokenEntry->Token->RspData.GLookupData = AllocatePool (sizeof (DNS_RESOURCE_RECORD));
if (Dns6TokenEntry->Token->RspData.GLookupData == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
Dns6TokenEntry->Token->RspData.GLookupData->RRList = AllocatePool (DnsHeader->AnswersNum * sizeof (DNS_RESOURCE_RECORD));
if (Dns6TokenEntry->Token->RspData.GLookupData->RRList == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
} else {
@ -1305,12 +1300,12 @@ ParseDnsResponse (
if (QuerySection->Type == DNS_TYPE_AAAA) {
Dns6TokenEntry->Token->RspData.H2AData = AllocatePool (sizeof (DNS6_HOST_TO_ADDR_DATA));
if (Dns6TokenEntry->Token->RspData.H2AData == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
Dns6TokenEntry->Token->RspData.H2AData->IpList = AllocatePool (DnsHeader->AnswersNum * sizeof (EFI_IPv6_ADDRESS));
if (Dns6TokenEntry->Token->RspData.H2AData->IpList == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
} else {
@ -1320,6 +1315,8 @@ ParseDnsResponse (
}
}
Status = EFI_NOT_FOUND;
//
// Processing AnswerSection.
//
@ -1350,7 +1347,7 @@ ParseDnsResponse (
//
Dns4RR[RRCount].QName = AllocateZeroPool (AsciiStrLen (QueryName) + 1);
if (Dns4RR[RRCount].QName == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns4RR[RRCount].QName, QueryName, AsciiStrLen (QueryName));
@ -1360,12 +1357,13 @@ ParseDnsResponse (
Dns4RR[RRCount].DataLength = AnswerSection->DataLength;
Dns4RR[RRCount].RData = AllocateZeroPool (Dns4RR[RRCount].DataLength);
if (Dns4RR[RRCount].RData == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns4RR[RRCount].RData, AnswerData, Dns4RR[RRCount].DataLength);
RRCount ++;
Status = EFI_SUCCESS;
} else if (Instance->Service->IpVersion == IP_VERSION_6 && Dns6TokenEntry->GeneralLookUp) {
Dns6RR = Dns6TokenEntry->Token->RspData.GLookupData->RRList;
AnswerData = (UINT8 *) AnswerSection + sizeof (*AnswerSection);
@ -1375,7 +1373,7 @@ ParseDnsResponse (
//
Dns6RR[RRCount].QName = AllocateZeroPool (AsciiStrLen (QueryName) + 1);
if (Dns6RR[RRCount].QName == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns6RR[RRCount].QName, QueryName, AsciiStrLen (QueryName));
@ -1385,12 +1383,13 @@ ParseDnsResponse (
Dns6RR[RRCount].DataLength = AnswerSection->DataLength;
Dns6RR[RRCount].RData = AllocateZeroPool (Dns6RR[RRCount].DataLength);
if (Dns6RR[RRCount].RData == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns6RR[RRCount].RData, AnswerData, Dns6RR[RRCount].DataLength);
RRCount ++;
Status = EFI_SUCCESS;
} else {
//
// It's not the GeneralLookUp querying.
@ -1427,26 +1426,32 @@ ParseDnsResponse (
//
Dns4CacheEntry = AllocateZeroPool (sizeof (EFI_DNS4_CACHE_ENTRY));
if (Dns4CacheEntry == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
Dns4CacheEntry->HostName = AllocateZeroPool (2 * (StrLen(Dns4TokenEntry->QueryHostName) + 1));
if (Dns4CacheEntry->HostName == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns4CacheEntry->HostName, Dns4TokenEntry->QueryHostName, 2 * (StrLen(Dns4TokenEntry->QueryHostName) + 1));
Dns4CacheEntry->IpAddress = AllocateZeroPool (sizeof (EFI_IPv4_ADDRESS));
if (Dns4CacheEntry->IpAddress == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns4CacheEntry->IpAddress, AnswerData, sizeof (EFI_IPv4_ADDRESS));
Dns4CacheEntry->Timeout = AnswerSection->Ttl;
if (CNameTtl != 0 && AnswerSection->Ttl != 0) {
Dns4CacheEntry->Timeout = MIN (CNameTtl, AnswerSection->Ttl);
} else {
Dns4CacheEntry->Timeout = MAX (CNameTtl, AnswerSection->Ttl);
}
UpdateDns4Cache (&mDriverData->Dns4CacheList, FALSE, TRUE, *Dns4CacheEntry);
IpCount ++;
Status = EFI_SUCCESS;
break;
case DNS_TYPE_AAAA:
//
@ -1478,26 +1483,40 @@ ParseDnsResponse (
//
Dns6CacheEntry = AllocateZeroPool (sizeof (EFI_DNS6_CACHE_ENTRY));
if (Dns6CacheEntry == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
Dns6CacheEntry->HostName = AllocateZeroPool (2 * (StrLen(Dns6TokenEntry->QueryHostName) + 1));
if (Dns6CacheEntry->HostName == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns6CacheEntry->HostName, Dns6TokenEntry->QueryHostName, 2 * (StrLen(Dns6TokenEntry->QueryHostName) + 1));
Dns6CacheEntry->IpAddress = AllocateZeroPool (sizeof (EFI_IPv6_ADDRESS));
if (Dns6CacheEntry->IpAddress == NULL) {
Status = EFI_UNSUPPORTED;
Status = EFI_OUT_OF_RESOURCES;
goto ON_EXIT;
}
CopyMem (Dns6CacheEntry->IpAddress, AnswerData, sizeof (EFI_IPv6_ADDRESS));
Dns6CacheEntry->Timeout = AnswerSection->Ttl;
if (CNameTtl != 0 && AnswerSection->Ttl != 0) {
Dns6CacheEntry->Timeout = MIN (CNameTtl, AnswerSection->Ttl);
} else {
Dns6CacheEntry->Timeout = MAX (CNameTtl, AnswerSection->Ttl);
}
UpdateDns6Cache (&mDriverData->Dns6CacheList, FALSE, TRUE, *Dns6CacheEntry);
IpCount ++;
Status = EFI_SUCCESS;
break;
case DNS_TYPE_CNAME:
//
// According RFC 1034 - 3.6.2, if the query name is an alias, the name server will include the CNAME
// record in the response and restart the query at the domain name specified in the data field of the
// CNAME record. So, just record the TTL value of the CNAME, then skip to parse the next record.
//
CNameTtl = AnswerSection->Ttl;
break;
default:
Status = EFI_UNSUPPORTED;
@ -1541,12 +1560,16 @@ ParseDnsResponse (
}
//
// Parsing is complete, SignalEvent here.
// Parsing is complete, free the sending packet and signal Event here.
//
if (Item != NULL && Item->Value != NULL) {
NetbufFree ((NET_BUF *) (Item->Value));
}
if (Instance->Service->IpVersion == IP_VERSION_4) {
ASSERT (Dns4TokenEntry != NULL);
Dns4RemoveTokenEntry (&Instance->Dns4TxTokens, Dns4TokenEntry);
Dns4TokenEntry->Token->Status = EFI_SUCCESS;
Dns4TokenEntry->Token->Status = Status;
if (Dns4TokenEntry->Token->Event != NULL) {
gBS->SignalEvent (Dns4TokenEntry->Token->Event);
DispatchDpc ();
@ -1554,7 +1577,7 @@ ParseDnsResponse (
} else {
ASSERT (Dns6TokenEntry != NULL);
Dns6RemoveTokenEntry (&Instance->Dns6TxTokens, Dns6TokenEntry);
Dns6TokenEntry->Token->Status = EFI_SUCCESS;
Dns6TokenEntry->Token->Status = Status;
if (Dns6TokenEntry->Token->Event != NULL) {
gBS->SignalEvent (Dns6TokenEntry->Token->Event);
DispatchDpc ();
@ -2037,7 +2060,7 @@ DnsOnTimerUpdate (
Entry = mDriverData->Dns4CacheList.ForwardLink;
while (Entry != &mDriverData->Dns4CacheList) {
Item4 = NET_LIST_USER_STRUCT (Entry, DNS4_CACHE, AllCacheLink);
if (Item4->DnsCache.Timeout<=0) {
if (Item4->DnsCache.Timeout == 0) {
RemoveEntryList (&Item4->AllCacheLink);
Entry = mDriverData->Dns4CacheList.ForwardLink;
} else {
@ -2056,7 +2079,7 @@ DnsOnTimerUpdate (
Entry = mDriverData->Dns6CacheList.ForwardLink;
while (Entry != &mDriverData->Dns6CacheList) {
Item6 = NET_LIST_USER_STRUCT (Entry, DNS6_CACHE, AllCacheLink);
if (Item6->DnsCache.Timeout<=0) {
if (Item6->DnsCache.Timeout == 0) {
RemoveEntryList (&Item6->AllCacheLink);
Entry = mDriverData->Dns6CacheList.ForwardLink;
} else {