static ndn_Error
decodeValidityPeriod
(struct ndn_ValidityPeriod *validityPeriod, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
// Expect a 15-character ISO string like "20131018T184139".
const size_t isoStringMaxLength = 15;
char isoString[isoStringMaxLength + 1];
struct ndn_Blob isoStringBlob;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_ValidityPeriod_ValidityPeriod, &endOffset)))
return error;
ndn_ValidityPeriod_clear(validityPeriod);
// Decode notBefore as an ISO string.
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_ValidityPeriod_NotBefore, &isoStringBlob)))
return error;
if (isoStringBlob.length > isoStringMaxLength)
return NDN_ERROR_Calendar_time_value_out_of_range;
ndn_memcpy((uint8_t *)isoString, isoStringBlob.value, isoStringBlob.length);
isoString[isoStringBlob.length] = 0;
if ((error = ndn_fromIsoString(isoString, &validityPeriod->notBefore)))
return error;
// Decode notAfter as an ISO string.
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_ValidityPeriod_NotAfter, &isoStringBlob)))
return error;
if (isoStringBlob.length > isoStringMaxLength)
return NDN_ERROR_Calendar_time_value_out_of_range;
ndn_memcpy((uint8_t *)isoString, isoStringBlob.value, isoStringBlob.length);
isoString[isoStringBlob.length] = 0;
if ((error = ndn_fromIsoString(isoString, &validityPeriod->notAfter)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
void
Node::RegisterResponse::operator()(const ptr_lib::shared_ptr<const Interest>& interest, const ptr_lib::shared_ptr<Data>& responseData)
{
// Decode responseData->getContent() and check for a success code.
// TODO: Move this into the TLV code.
struct ndn_TlvDecoder decoder;
ndn_TlvDecoder_initialize
(&decoder, responseData->getContent().buf(),
responseData->getContent().size());
ndn_Error error;
size_t endOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(&decoder, ndn_Tlv_NfdCommand_ControlResponse, &endOffset))) {
_LOG_DEBUG
("Register prefix failed: Error decoding the NFD response: " <<
ndn_getErrorString(error));
info_->onRegisterFailed_(info_->prefix_);
return;
}
uint64_t statusCode;
if ((error = ndn_TlvDecoder_readNonNegativeIntegerTlv
(&decoder, ndn_Tlv_NfdCommand_StatusCode, &statusCode))) {
_LOG_DEBUG
("Register prefix failed: Error decoding the NFD response: " <<
ndn_getErrorString(error));
info_->onRegisterFailed_(info_->prefix_);
return;
}
// Status code 200 is "OK".
if (statusCode != 200) {
_LOG_DEBUG
("Register prefix failed: Expected NFD status code 200, got: " <<
statusCode);
info_->onRegisterFailed_(info_->prefix_);
return;
}
_LOG_DEBUG("Register prefix succeeded with the NFD forwarder for prefix " <<
info_->prefix_->toUri());
}
static ndn_Error
decodeExclude(struct ndn_Exclude *exclude, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Exclude, &endOffset)))
return error;
exclude->nEntries = 0;
while (decoder->offset < endOffset) {
int gotExpectedTag;
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_Any, endOffset, &gotExpectedTag)))
return error;
if (gotExpectedTag) {
// Read past the Any TLV.
int dummyValue;
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_Any, endOffset, &dummyValue)))
return error;
if ((error = ndn_Exclude_appendAny(exclude)))
return error;
}
else {
// First append an empty component, then decode into it.
if ((error = ndn_Exclude_appendComponent(exclude, 0, 0)))
return error;
if ((error = ndn_decodeTlvNameComponent
(&exclude->entries[exclude->nEntries - 1].component, decoder)))
return error;
exclude->entries[exclude->nEntries - 1].type = ndn_Exclude_COMPONENT;
}
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
ndn_Error
ndn_decodeTlvControlResponse
(struct ndn_ControlResponse *controlResponse, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
uint64_t statusCode;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_NfdCommand_ControlResponse, &endOffset)))
return error;
if ((error = ndn_TlvDecoder_readNonNegativeIntegerTlv
(decoder, ndn_Tlv_NfdCommand_StatusCode, &statusCode)))
return error;
controlResponse->statusCode = (int)statusCode;
if ((error = ndn_TlvDecoder_readBlobTlv
(decoder, ndn_Tlv_NfdCommand_StatusText, &controlResponse->statusText)))
return error;
// Decode the body.
if ((error = ndn_TlvDecoder_peekType
(decoder, ndn_Tlv_ControlParameters_ControlParameters, endOffset,
&gotExpectedType)))
return error;
if (gotExpectedType) {
controlResponse->hasBodyAsControlParameters = 1;
if ((error = ndn_decodeTlvControlParameters
(&controlResponse->bodyAsControlParameters, decoder)))
return error;
}
else
controlResponse->hasBodyAsControlParameters = 0;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
ndn_Error
ndn_encodeTlvSignatureInfo
(const struct ndn_Signature *signatureInfo, struct ndn_TlvEncoder *encoder)
{
if (signatureInfo->type == ndn_SignatureType_Generic) {
// Handle a Generic signature separately since it has the entire encoding.
const struct ndn_Blob *encoding = &signatureInfo->signatureInfoEncoding;
ndn_Error error;
size_t endOffset;
uint64_t signatureType;
// Do a test decoding to sanity check that it is valid TLV.
struct ndn_TlvDecoder decoder;
ndn_TlvDecoder_initialize(&decoder, encoding->value, encoding->length);
error = ndn_TlvDecoder_readNestedTlvsStart
(&decoder, ndn_Tlv_SignatureInfo, &endOffset);
if (!error)
error = ndn_TlvDecoder_readNonNegativeIntegerTlv
(&decoder, ndn_Tlv_SignatureType, &signatureType);
if (!error)
error = ndn_TlvDecoder_finishNestedTlvs(&decoder, endOffset);
if (error)
return NDN_ERROR_The_Generic_signature_encoding_is_not_a_valid_NDN_TLV_SignatureInfo;
return ndn_TlvEncoder_writeArray(encoder, encoding->value, encoding->length);
}
if (signatureInfo->type == ndn_SignatureType_Sha256WithRsaSignature ||
signatureInfo->type == ndn_SignatureType_Sha256WithEcdsaSignature ||
signatureInfo->type == ndn_SignatureType_HmacWithSha256Signature)
return ndn_TlvEncoder_writeNestedTlv
(encoder, ndn_Tlv_SignatureInfo,
encodeSignatureWithKeyLocatorAndValidityPeriodValue, signatureInfo, 0);
else if (signatureInfo->type == ndn_SignatureType_DigestSha256Signature)
return ndn_TlvEncoder_writeNestedTlv
(encoder, ndn_Tlv_SignatureInfo, encodeDigestSha256Value,
signatureInfo, 0);
else
return NDN_ERROR_encodeSignatureInfo_unrecognized_SignatureType;
}
ndn_Error
ndn_decodeTlvLpPacket
(struct ndn_LpPacket *lpPacket, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
ndn_LpPacket_clear(lpPacket);
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_LpPacket_LpPacket, &endOffset)))
return error;
while (decoder->offset < endOffset) {
// Imitate ndn_TlvDecoder_readTypeAndLength.
uint64_t fieldTypeVarNumber;
int fieldType;
uint64_t fieldLength;
size_t fieldEndOffset;
if ((error = ndn_TlvDecoder_readVarNumber(decoder, &fieldTypeVarNumber)))
return error;
fieldType = (int)fieldTypeVarNumber;
if ((error = ndn_TlvDecoder_readVarNumber(decoder, &fieldLength)))
return error;
fieldEndOffset = decoder->offset + (size_t)fieldLength;
if (fieldEndOffset > decoder->inputLength)
return NDN_ERROR_TLV_length_exceeds_buffer_length;
if (fieldType == ndn_Tlv_LpPacket_Fragment) {
// Set the fragment to the bytes of the TLV value.
if ((error = ndn_TlvDecoder_getSlice
(decoder, decoder->offset, fieldEndOffset,
&lpPacket->fragmentWireEncoding)))
return error;
ndn_TlvDecoder_seek(decoder, fieldEndOffset);
// The fragment is supposed to be the last field.
break;
}
else if (fieldType == ndn_Tlv_LpPacket_Nack) {
struct ndn_NetworkNack *networkNack;
int code;
if ((error = ndn_NetworkNack_add(lpPacket, &networkNack)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_LpPacket_NackReason, fieldEndOffset, &code)))
return error;
// The enum numeric values are the same as this wire format, so use as is.
if (code < 0 || code == ndn_NetworkNackReason_NONE)
// This includes an omitted NackReason.
networkNack->reason = ndn_NetworkNackReason_NONE;
else if (code == ndn_NetworkNackReason_CONGESTION ||
code == ndn_NetworkNackReason_DUPLICATE ||
code == ndn_NetworkNackReason_NO_ROUTE)
networkNack->reason = code;
else {
// Unrecognized reason.
networkNack->reason = ndn_NetworkNackReason_OTHER_CODE;
networkNack->otherReasonCode = code;
}
}
else if (fieldType == ndn_Tlv_LpPacket_IncomingFaceId) {
struct ndn_IncomingFaceId *incomingFaceId;
if ((error = ndn_IncomingFaceId_add(lpPacket, &incomingFaceId)))
return error;
if ((error = ndn_TlvDecoder_readNonNegativeInteger
(decoder, fieldLength, &incomingFaceId->faceId)))
return error;
}
else {
// Unrecognized field type. The conditions for ignoring are here:
// http://redmine.named-data.net/projects/nfd/wiki/NDNLPv2
int canIgnore =
(fieldType >= ndn_Tlv_LpPacket_IGNORE_MIN &&
fieldType <= ndn_Tlv_LpPacket_IGNORE_MAX &&
(fieldType & 0x01) == 1);
if (!canIgnore)
return NDN_ERROR_did_not_get_the_expected_TLV_type;
// Ignore.
ndn_TlvDecoder_seek(decoder, fieldEndOffset);
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, fieldEndOffset)))
return error;
}
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
ndn_decodeTlvInterestV03
(struct ndn_Interest *interest, size_t *signedPortionBeginOffset,
size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int canBePrefix, mustBeFresh;
struct ndn_Blob dummyBlob;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_Interest, &endOffset)))
return error;
if ((error = ndn_decodeTlvName
(&interest->name, signedPortionBeginOffset, signedPortionEndOffset,
decoder)))
return error;
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_CanBePrefix, endOffset, &canBePrefix)))
return error;
ndn_Interest_setCanBePrefix(interest, canBePrefix);
if ((error = ndn_TlvDecoder_readBooleanTlv
(decoder, ndn_Tlv_MustBeFresh, endOffset, &mustBeFresh)))
return error;
ndn_Interest_setMustBeFresh(interest, mustBeFresh);
// Get the encoded sequence of delegations as is.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_ForwardingHint, endOffset,
&interest->forwardingHintWireEncoding)))
return error;
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_Nonce, endOffset, &interest->nonce)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_InterestLifetime, endOffset, &interest->interestLifetimeMilliseconds)))
return error;
// Clear the unused fields.
interest->minSuffixComponents = -1;
ndn_KeyLocator_initialize
(&interest->keyLocator, interest->keyLocator.keyName.components,
interest->keyLocator.keyName.maxComponents);
interest->exclude.nEntries = 0;
interest->childSelector = -1;
ndn_Blob_initialize(&interest->linkWireEncoding, 0, 0);
interest->selectedDelegationIndex = -1;
// Ignore the HopLimit and Parameters.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_HopLimit, endOffset, &dummyBlob)))
return error;
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_Parameters, endOffset, &dummyBlob)))
return error;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
static ndn_Error
ndn_decodeTlvInterestV02
(struct ndn_Interest *interest, size_t *signedPortionBeginOffset,
size_t *signedPortionEndOffset, struct ndn_TlvDecoder *decoder)
{
ndn_Error error;
size_t endOffset;
int gotExpectedType;
if ((error = ndn_TlvDecoder_readNestedTlvsStart(decoder, ndn_Tlv_Interest, &endOffset)))
return error;
if ((error = ndn_decodeTlvName
(&interest->name, signedPortionBeginOffset, signedPortionEndOffset,
decoder)))
return error;
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Selectors, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
if ((error = decodeSelectors(interest, decoder)))
return error;
}
else {
// Set selectors to none.
interest->minSuffixComponents = -1;
interest->maxSuffixComponents = -1;
ndn_KeyLocator_initialize
(&interest->keyLocator, interest->keyLocator.keyName.components,
interest->keyLocator.keyName.maxComponents);
interest->exclude.nEntries = 0;
interest->childSelector = -1;
interest->mustBeFresh = 0;
}
// Require a Nonce, but don't force it to be 4 bytes.
if ((error = ndn_TlvDecoder_readBlobTlv(decoder, ndn_Tlv_Nonce, &interest->nonce)))
return error;
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlvAsDouble
(decoder, ndn_Tlv_InterestLifetime, endOffset, &interest->interestLifetimeMilliseconds)))
return error;
// Get the encoded sequence of delegations as is.
if ((error = ndn_TlvDecoder_readOptionalBlobTlv
(decoder, ndn_Tlv_ForwardingHint, endOffset,
&interest->forwardingHintWireEncoding)))
return error;
if ((error = ndn_TlvDecoder_peekType(decoder, ndn_Tlv_Data, endOffset, &gotExpectedType)))
return error;
if (gotExpectedType) {
// Get the bytes of the Link TLV.
size_t linkBeginOffset = decoder->offset;
size_t linkEndOffset;
if ((error = ndn_TlvDecoder_readNestedTlvsStart
(decoder, ndn_Tlv_Data, &linkEndOffset)))
return error;
ndn_TlvDecoder_seek(decoder, linkEndOffset);
if ((error = ndn_TlvDecoder_getSlice
(decoder, linkBeginOffset, linkEndOffset, &interest->linkWireEncoding)))
return error;
}
else
ndn_Blob_initialize(&interest->linkWireEncoding, 0, 0);
if ((error = ndn_TlvDecoder_readOptionalNonNegativeIntegerTlv
(decoder, ndn_Tlv_SelectedDelegation, endOffset,
&interest->selectedDelegationIndex)))
return error;
if (interest->selectedDelegationIndex >= 0 && !interest->linkWireEncoding.value)
return NDN_ERROR_Interest_has_a_selected_delegation_but_no_link_object;
if ((error = ndn_TlvDecoder_finishNestedTlvs(decoder, endOffset)))
return error;
return NDN_ERROR_success;
}
