PurpleI2P/i2pd
1
0
Fork 0
mirror of https://github.com/PurpleI2P/i2pd.git synced 2025-01-27 13:14:15 +00:00
Code Issues Releases Activity

CRC32 verification

Browse Source
This commit is contained in:
orignal 2014-12-16 12:48:42 -05:00
parent e3f077ee9a
commit 75b67b7ea7
1 changed files with 19 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Reseed.cpp
View File

@ -6,6 +6,7 @@
#include <cryptopp/osrng.h>
#include <cryptopp/asn.h>
#include <cryptopp/base64.h>
#include <cryptopp/crc.h>
#include <cryptopp/zinflate.h>
#include "I2PEndian.h"
#include "Reseed.h"
@ -167,6 +168,7 @@ namespace data
const char SU3_MAGIC_NUMBER[]="I2Psu3";
const uint32_t ZIP_HEADER_SIGNATURE = 0x04034B50;
const uint32_t ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE = 0x02014B50;
const uint16_t ZIP_BIT_FLAG_DATA_DESCRIPTOR = 0x0008;
int Reseeder::ProcessSU3Stream (std::istream& s)
{
@ -263,8 +265,10 @@ namespace data
uint16_t compressionMethod;
s.read ((char *)&compressionMethod, 2);
compressionMethod = le16toh (compressionMethod);
s.seekg (8, std::ios::cur); // skip fields we don't care about
uint32_t compressedSize, uncompressedSize;
s.seekg (4, std::ios::cur); // skip fields we don't care about
uint32_t crc32, compressedSize, uncompressedSize;
s.read ((char *)&crc32, 4);
crc32 = le32toh (crc32);
s.read ((char *)&compressedSize, 4);
compressedSize = le32toh (compressedSize);
s.read ((char *)&uncompressedSize, 4);
@ -288,7 +292,8 @@ namespace data
return numFiles;
}
s.seekg (4, std::ios::cur); // skip CRC-32
s.read ((char *)&crc32, 4);
crc32 = le32toh (crc32);
s.read ((char *)&compressedSize, 4);
compressedSize = le32toh (compressedSize) + 4; // ??? we must consider signature as part of compressed data
s.read ((char *)&uncompressedSize, 4);
@ -316,8 +321,13 @@ namespace data
{
uint8_t * uncompressed = new uint8_t[uncompressedSize];
decompressor.Get (uncompressed, uncompressedSize);
i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize);
numFiles++;
if (CryptoPP::CRC32().VerifyDigest ((uint8_t *)&crc32, uncompressed, uncompressedSize))
{
i2p::data::netdb.AddRouterInfo (uncompressed, uncompressedSize);
numFiles++;
}
else
LogPrint (eLogError, "CRC32 verification failed");
delete[] uncompressed;
}
else
@ -333,7 +343,11 @@ namespace data
s.seekg (12, std::ios::cur); // skip data descriptor section if presented (12 = 16 - 4)
}
else
{
if (signature != ZIP_CENTRAL_DIRECTORY_HEADER_SIGNATURE)
LogPrint (eLogWarning, "Missing zip central directory header");
break; // no more files
}
size_t end = s.tellg ();
if (end - contentPos >= contentLength)
break; // we are beyond contentLength