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Deduplicate addrdb.cpp and use CHashWriter/Verifier

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This commit is contained in:
Pieter Wuille 2017-04-21 04:50:55 -07:00
parent 7cc2c670e3
commit cf68a488a4
2 changed files with 73 additions and 145 deletions
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216
src/addrdb.cpp
View file

@ -15,25 +15,31 @@
#include "tinyformat.h"
#include "util.h"
namespace {
CBanDB::CBanDB()
template <typename Stream, typename Data>
bool SerializeDB(Stream& stream, const Data& data)
{
pathBanlist = GetDataDir() / "banlist.dat";
// Write and commit header, data
try {
CHashWriter hasher(SER_DISK, CLIENT_VERSION);
stream << FLATDATA(Params().MessageStart()) << data;
hasher << FLATDATA(Params().MessageStart()) << data;
stream << hasher.GetHash();
} catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
return true;
}
bool CBanDB::Write(const banmap_t& banSet)
template <typename Data>
bool SerializeFileDB(const std::string& prefix, const fs::path& path, const Data& data)
{
// Generate random temporary filename
unsigned short randv = 0;
GetRandBytes((unsigned char*)&randv, sizeof(randv));
std::string tmpfn = strprintf("banlist.dat.%04x", randv);
// serialize banlist, checksum data up to that point, then append csum
CDataStream ssBanlist(SER_DISK, CLIENT_VERSION);
ssBanlist << FLATDATA(Params().MessageStart());
ssBanlist << banSet;
uint256 hash = Hash(ssBanlist.begin(), ssBanlist.end());
ssBanlist << hash;
std::string tmpfn = strprintf("%s.%04x", prefix, randv);
// open temp output file, and associate with CAutoFile
fs::path pathTmp = GetDataDir() / tmpfn;
@ -42,69 +48,41 @@ bool CBanDB::Write(const banmap_t& banSet)
if (fileout.IsNull())
return error("%s: Failed to open file %s", __func__, pathTmp.string());
// Write and commit header, data
try {
fileout << ssBanlist;
}
catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
// Serialize
if (!SerializeDB(fileout, data)) return false;
FileCommit(fileout.Get());
fileout.fclose();
// replace existing banlist.dat, if any, with new banlist.dat.XXXX
if (!RenameOver(pathTmp, pathBanlist))
// replace existing file, if any, with new file
if (!RenameOver(pathTmp, path))
return error("%s: Rename-into-place failed", __func__);
return true;
}
bool CBanDB::Read(banmap_t& banSet)
template <typename Stream, typename Data>
bool DeserializeDB(Stream& stream, Data& data, bool fCheckSum = true)
{
// open input file, and associate with CAutoFile
FILE *file = fsbridge::fopen(pathBanlist, "rb");
CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
if (filein.IsNull())
return error("%s: Failed to open file %s", __func__, pathBanlist.string());
// use file size to size memory buffer
uint64_t fileSize = fs::file_size(pathBanlist);
uint64_t dataSize = 0;
// Don't try to resize to a negative number if file is small
if (fileSize >= sizeof(uint256))
dataSize = fileSize - sizeof(uint256);
std::vector<unsigned char> vchData;
vchData.resize(dataSize);
uint256 hashIn;
// read data and checksum from file
try {
filein.read((char *)&vchData[0], dataSize);
filein >> hashIn;
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
filein.fclose();
CDataStream ssBanlist(vchData, SER_DISK, CLIENT_VERSION);
// verify stored checksum matches input data
uint256 hashTmp = Hash(ssBanlist.begin(), ssBanlist.end());
if (hashIn != hashTmp)
return error("%s: Checksum mismatch, data corrupted", __func__);
unsigned char pchMsgTmp[4];
try {
CHashVerifier<Stream> verifier(&stream);
// de-serialize file header (network specific magic number) and ..
ssBanlist >> FLATDATA(pchMsgTmp);
unsigned char pchMsgTmp[4];
verifier >> FLATDATA(pchMsgTmp);
// ... verify the network matches ours
if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
return error("%s: Invalid network magic number", __func__);
// de-serialize ban data
ssBanlist >> banSet;
// de-serialize data
verifier >> data;
// verify checksum
if (fCheckSum) {
uint256 hashTmp;
stream >> hashTmp;
if (hashTmp != verifier.GetHash()) {
return error("%s: Checksum mismatch, data corrupted", __func__);
}
}
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
@ -113,6 +91,35 @@ bool CBanDB::Read(banmap_t& banSet)
return true;
}
template <typename Data>
bool DeserializeFileDB(const fs::path& path, Data& data)
{
// open input file, and associate with CAutoFile
FILE *file = fsbridge::fopen(path, "rb");
CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
if (filein.IsNull())
return error("%s: Failed to open file %s", __func__, path.string());
return DeserializeDB(filein, data);
}
}
CBanDB::CBanDB()
{
pathBanlist = GetDataDir() / "banlist.dat";
}
bool CBanDB::Write(const banmap_t& banSet)
{
return SerializeFileDB("banlist", pathBanlist, banSet);
}
bool CBanDB::Read(banmap_t& banSet)
{
return DeserializeFileDB(pathBanlist, banSet);
}
CAddrDB::CAddrDB()
{
pathAddr = GetDataDir() / "peers.dat";
@ -120,99 +127,20 @@ CAddrDB::CAddrDB()
bool CAddrDB::Write(const CAddrMan& addr)
{
// Generate random temporary filename
unsigned short randv = 0;
GetRandBytes((unsigned char*)&randv, sizeof(randv));
std::string tmpfn = strprintf("peers.dat.%04x", randv);
// serialize addresses, checksum data up to that point, then append csum
CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
ssPeers << FLATDATA(Params().MessageStart());
ssPeers << addr;
uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
ssPeers << hash;
// open temp output file, and associate with CAutoFile
fs::path pathTmp = GetDataDir() / tmpfn;
FILE *file = fsbridge::fopen(pathTmp, "wb");
CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
if (fileout.IsNull())
return error("%s: Failed to open file %s", __func__, pathTmp.string());
// Write and commit header, data
try {
fileout << ssPeers;
}
catch (const std::exception& e) {
return error("%s: Serialize or I/O error - %s", __func__, e.what());
}
FileCommit(fileout.Get());
fileout.fclose();
// replace existing peers.dat, if any, with new peers.dat.XXXX
if (!RenameOver(pathTmp, pathAddr))
return error("%s: Rename-into-place failed", __func__);
return true;
return SerializeFileDB("peers", pathAddr, addr);
}
bool CAddrDB::Read(CAddrMan& addr)
{
// open input file, and associate with CAutoFile
FILE *file = fsbridge::fopen(pathAddr, "rb");
CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
if (filein.IsNull())
return error("%s: Failed to open file %s", __func__, pathAddr.string());
// use file size to size memory buffer
uint64_t fileSize = fs::file_size(pathAddr);
uint64_t dataSize = 0;
// Don't try to resize to a negative number if file is small
if (fileSize >= sizeof(uint256))
dataSize = fileSize - sizeof(uint256);
std::vector<unsigned char> vchData;
vchData.resize(dataSize);
uint256 hashIn;
// read data and checksum from file
try {
filein.read((char *)&vchData[0], dataSize);
filein >> hashIn;
}
catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
filein.fclose();
CDataStream ssPeers(vchData, SER_DISK, CLIENT_VERSION);
// verify stored checksum matches input data
uint256 hashTmp = Hash(ssPeers.begin(), ssPeers.end());
if (hashIn != hashTmp)
return error("%s: Checksum mismatch, data corrupted", __func__);
return Read(addr, ssPeers);
return DeserializeFileDB(pathAddr, addr);
}
bool CAddrDB::Read(CAddrMan& addr, CDataStream& ssPeers)
{
unsigned char pchMsgTmp[4];
try {
// de-serialize file header (network specific magic number) and ..
ssPeers >> FLATDATA(pchMsgTmp);
// ... verify the network matches ours
if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
return error("%s: Invalid network magic number", __func__);
// de-serialize address data into one CAddrMan object
ssPeers >> addr;
}
catch (const std::exception& e) {
// de-serialization has failed, ensure addrman is left in a clean state
bool ret = DeserializeDB(ssPeers, addr, false);
if (!ret) {
// Ensure addrman is left in a clean state
addr.Clear();
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
return true;
return ret;
}

2
src/addrdb.h
View file

@ -85,7 +85,7 @@ public:
CAddrDB();
bool Write(const CAddrMan& addr);
bool Read(CAddrMan& addr);
bool Read(CAddrMan& addr, CDataStream& ssPeers);
static bool Read(CAddrMan& addr, CDataStream& ssPeers);
};
/** Access to the banlist database (banlist.dat) */