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process meta LS2

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orignal 2019-01-02 14:19:10 -05:00
parent 2e56c4895d
commit c54e6bafdb
3 changed files with 81 additions and 22 deletions
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89
libi2pd/LeaseSet.cpp
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@ -237,6 +237,7 @@ namespace data
void LeaseSet2::ReadFromBuffer (const uint8_t * buf, size_t len)
{
// standard LS2 header
auto identity = std::make_shared<IdentityEx>(buf, len);
SetIdentity (identity);
size_t offset = identity->GetFullLen ();
@ -262,24 +263,21 @@ namespace data
if (!identity->Verify (signedData, keyLen + 6, buf + offset)) return;
offset += offlineVerifier->GetSignatureLen ();
}
// properties
uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
offset += propertiesLen; // skip for now. TODO: implement properties
if (offset + 1 >= len) return;
// key sections
int numKeySections = buf[offset]; offset++;
for (int i = 0; i < numKeySections; i++)
// type specific part
size_t s = 0;
switch (m_StoreType)
{
// skip key for now. TODO: implement encryption key
offset += 2; // encryption key type
if (offset + 2 >= len) return;
uint16_t encryptionKeyLen = bufbe16toh (buf + offset); offset += 2;
offset += encryptionKeyLen;
if (offset >= len) return;
}
// leases
int numLeases = buf[offset]; offset++;
offset += numLeases*40; // 40 bytes each
case NETDB_STORE_TYPE_STANDARD_LEASESET2:
s = ReadStandardLS2TypeSpecificPart (buf + offset, len - offset);
break;
case NETDB_STORE_TYPE_META_LEASESET2:
s = ReadMetaLS2TypeSpecificPart (buf + offset, len - offset);
break;
default:
LogPrint (eLogWarning, "LeaseSet2: Unexpected store type ", (int)m_StoreType);
}
if (!s) return;
offset += s;
// verify signature
if (offset + identity->GetSignatureLen () > len) return;
uint8_t * buf1 = new uint8_t[offset + 1];
@ -292,6 +290,63 @@ namespace data
SetIsValid (verified);
}
size_t LeaseSet2::ReadStandardLS2TypeSpecificPart (const uint8_t * buf, size_t len)
{
size_t offset = 0;
// properties
uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
offset += propertiesLen; // skip for now. TODO: implement properties
if (offset + 1 >= len) return 0;
// key sections
int numKeySections = buf[offset]; offset++;
for (int i = 0; i < numKeySections; i++)
{
// skip key for now. TODO: implement encryption key
offset += 2; // encryption key type
if (offset + 2 >= len) return 0;
uint16_t encryptionKeyLen = bufbe16toh (buf + offset); offset += 2;
offset += encryptionKeyLen;
if (offset >= len) return 0;
}
// leases
if (offset + 1 >= len) return 0;
int numLeases = buf[offset]; offset++;
for (int i = 0; i < numLeases; i++)
{
if (offset + 40 > len) return 0;
offset += 40; // lease
}
return offset;
}
size_t LeaseSet2::ReadMetaLS2TypeSpecificPart (const uint8_t * buf, size_t len)
{
size_t offset = 0;
// properties
uint16_t propertiesLen = bufbe16toh (buf + offset); offset += 2;
offset += propertiesLen; // skip for now. TODO: implement properties
// entries
if (offset + 1 >= len) return 0;
int numEntries = buf[offset]; offset++;
for (int i = 0; i < numEntries; i++)
{
if (offset + 40 >= len) return 0;
offset += 32; // hash
offset += 3; // flags
offset += 1; // cost
offset += 4; // expires
}
// revocations
if (offset + 1 >= len) return 0;
int numRevocations = buf[offset]; offset++;
for (int i = 0; i < numRevocations; i++)
{
if (offset + 32 > len) return 0;
offset += 32; // hash
}
return offset;
}
LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels):
m_ExpirationTime (0), m_Identity (identity)
{