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apt/ftparchive/cachedb.cc
Daniel Baumann 6810ba718b
Adding upstream version 3.0.2. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-20 21:10:43 +02:00

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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
/* ######################################################################
CacheDB
Simple uniform interface to a cache database.
##################################################################### */
/*}}}*/
// Include Files /*{{{*/
#include <config.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/debfile.h>
#include <apt-pkg/error.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/gpgv.h>
#include <apt-pkg/hashes.h>
#include <apt-pkg/strutl.h>
#include <cctype>
#include <cstddef>
#include <netinet/in.h> // htonl, etc
#include <strings.h>
#include <sys/stat.h>
#include "cachedb.h"
#include <apti18n.h>
/*}}}*/
CacheDB::CacheDB(std::string const &DB)
: Dbp(0), Fd(NULL), DebFile(0)
{
TmpKey[0]='\0';
ReadyDB(DB);
}
CacheDB::~CacheDB()
{
ReadyDB();
delete DebFile;
CloseFile();
}
// CacheDB::ReadyDB - Ready the DB2 /*{{{*/
// ---------------------------------------------------------------------
/* This opens the DB2 file for caching package information */
bool CacheDB::ReadyDB(std::string const &DB)
{
int err;
ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
// Close the old DB
if (Dbp != 0)
Dbp->close(Dbp,0);
/* Check if the DB was disabled while running and deal with a
corrupted DB */
if (DBFailed() == true)
{
_error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
rename(DBFile.c_str(),(DBFile+".old").c_str());
}
DBLoaded = false;
Dbp = 0;
DBFile = std::string();
if (DB.empty())
return true;
db_create(&Dbp, NULL, 0);
if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
(ReadOnly?DB_RDONLY:DB_CREATE),
0644)) != 0)
{
if (err == DB_OLD_VERSION)
{
_error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
err = Dbp->upgrade(Dbp, DB.c_str(), 0);
if (!err)
err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
(ReadOnly?DB_RDONLY:DB_CREATE), 0644);
}
// the database format has changed from DB_HASH to DB_BTREE in
// apt 0.6.44
if (err == EINVAL)
{
_error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
}
if (err)
{
Dbp = 0;
return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
}
}
DBFile = DB;
DBLoaded = true;
return true;
}
/*}}}*/
// CacheDB::OpenFile - Open the file /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::OpenFile()
{
// always close existing file first
CloseFile();
// open a new file
Fd = new FileFd(FileName,FileFd::ReadOnly);
if (_error->PendingError() == true)
{
CloseFile();
return false;
}
return true;
}
/*}}}*/
// CacheDB::CloseFile - Close the file /*{{{*/
void CacheDB::CloseFile()
{
if(Fd != NULL)
{
delete Fd;
Fd = NULL;
}
}
/*}}}*/
// CacheDB::OpenDebFile - Open a debfile /*{{{*/
bool CacheDB::OpenDebFile()
{
// always close existing file first
CloseDebFile();
// first open the fd, then pass it to the debDebFile
if(OpenFile() == false)
return false;
DebFile = new debDebFile(*Fd);
if (_error->PendingError() == true)
return false;
return true;
}
/*}}}*/
// CacheDB::CloseDebFile - Close a debfile again /*{{{*/
void CacheDB::CloseDebFile()
{
CloseFile();
if(DebFile != NULL)
{
delete DebFile;
DebFile = NULL;
}
}
/*}}}*/
// CacheDB::GetFileStat - Get stats from the file /*{{{*/
// ---------------------------------------------------------------------
/* This gets the size from the database if it's there. If we need
* to look at the file, also get the mtime from the file. */
bool CacheDB::GetFileStat(bool const &doStat)
{
if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
return true;
/* Get it from the file. */
if (OpenFile() == false)
return false;
// Stat the file
struct stat St;
if (fstat(Fd->Fd(),&St) != 0)
{
CloseFile();
return _error->Errno("fstat",
_("Failed to stat %s"),FileName.c_str());
}
CurStat.FileSize = St.st_size;
CurStat.mtime = htonl(St.st_mtime);
CurStat.Flags |= FlSize;
return true;
}
/*}}}*/
// CacheDB::GetCurStatCompatOldFormat /*{{{*/
// ---------------------------------------------------------------------
/* Read the old (32bit FileSize) StateStore format from disk */
bool CacheDB::GetCurStatCompatOldFormat()
{
InitQueryStats();
Data.data = &CurStatOldFormat;
Data.flags = DB_DBT_USERMEM;
Data.ulen = sizeof(CurStatOldFormat);
if (Get() == false)
{
CurStat.Flags = 0;
} else {
CurStat.Flags = CurStatOldFormat.Flags;
CurStat.mtime = CurStatOldFormat.mtime;
CurStat.FileSize = CurStatOldFormat.FileSize;
memcpy(CurStat.MD5, CurStatOldFormat.MD5, sizeof(CurStat.MD5));
memcpy(CurStat.SHA1, CurStatOldFormat.SHA1, sizeof(CurStat.SHA1));
memcpy(CurStat.SHA256, CurStatOldFormat.SHA256, sizeof(CurStat.SHA256));
}
return true;
}
/*}}}*/
// CacheDB::GetCurStatCompatOldFormat /*{{{*/
// ---------------------------------------------------------------------
/* Read the new (64bit FileSize) StateStore format from disk */
bool CacheDB::GetCurStatCompatNewFormat()
{
InitQueryStats();
Data.data = &CurStat;
Data.flags = DB_DBT_USERMEM;
Data.ulen = sizeof(CurStat);
if (Get() == false)
{
CurStat.Flags = 0;
}
return true;
}
/*}}}*/
// CacheDB::GetCurStat - Set the CurStat variable. /*{{{*/
// ---------------------------------------------------------------------
/* Sets the CurStat variable. Either to 0 if no database is used
* or to the value in the database if one is used */
bool CacheDB::GetCurStat()
{
memset(&CurStat,0,sizeof(CurStat));
if (DBLoaded)
{
// do a first query to just get the size of the data on disk
InitQueryStats();
Data.data = &CurStat;
Data.flags = DB_DBT_USERMEM;
Data.ulen = 0;
Get();
if (Data.size == 0)
{
// nothing needs to be done, we just have not data for this deb
}
// check if the record is written in the old format (32bit filesize)
else if(Data.size == sizeof(CurStatOldFormat))
{
GetCurStatCompatOldFormat();
}
else if(Data.size == sizeof(CurStat))
{
GetCurStatCompatNewFormat();
} else {
return _error->Error("Cache record size mismatch (%ul)", Data.size);
}
CurStat.Flags = ntohl(CurStat.Flags);
CurStat.FileSize = ntohl(CurStat.FileSize);
}
return true;
}
/*}}}*/
// CacheDB::GetFileInfo - Get all the info about the file /*{{{*/
// ---------------------------------------------------------------------
bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents,
bool const &GenContentsOnly, bool const DoSource, unsigned int const DoHashes,
bool const &checkMtime)
{
this->FileName = FileName;
if (GetCurStat() == false)
return false;
OldStat = CurStat;
if (GetFileStat(checkMtime) == false)
return false;
/* if mtime changed, update CurStat from disk */
if (checkMtime == true && OldStat.mtime != CurStat.mtime)
CurStat.Flags = FlSize;
Stats.Bytes += CurStat.FileSize;
++Stats.Packages;
if ((DoControl && LoadControl() == false)
|| (DoContents && LoadContents(GenContentsOnly) == false)
|| (DoSource && LoadSource() == false)
|| (DoHashes != 0 && GetHashes(false, DoHashes) == false)
)
{
return false;
}
return true;
}
/*}}}*/
bool CacheDB::LoadSource() /*{{{*/
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlSource) == FlSource)
{
// Lookup the control information
InitQuerySource();
if (Get() == true && Dsc.TakeDsc(Data.data, Data.size) == true)
{
return true;
}
CurStat.Flags &= ~FlSource;
}
if (OpenFile() == false)
return false;
Stats.Misses++;
if (Dsc.Read(FileName) == false)
return false;
if (Dsc.Length == 0)
return _error->Error(_("Failed to read .dsc"));
// Write back the control information
InitQuerySource();
if (Put(Dsc.Data.c_str(), Dsc.Length) == true)
CurStat.Flags |= FlSource;
return true;
}
/*}}}*/
// CacheDB::LoadControl - Load Control information /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadControl()
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlControl) == FlControl)
{
// Lookup the control information
InitQueryControl();
if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
return true;
CurStat.Flags &= ~FlControl;
}
if(OpenDebFile() == false)
return false;
Stats.Misses++;
if (Control.Read(*DebFile) == false)
return false;
if (Control.Control == 0)
return _error->Error(_("Archive has no control record"));
// Write back the control information
InitQueryControl();
if (Put(Control.Control,Control.Length) == true)
CurStat.Flags |= FlControl;
return true;
}
/*}}}*/
// CacheDB::LoadContents - Load the File Listing /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::LoadContents(bool const &GenOnly)
{
// Try to read the control information out of the DB.
if ((CurStat.Flags & FlContents) == FlContents)
{
if (GenOnly == true)
return true;
// Lookup the contents information
InitQueryContent();
if (Get() == true)
{
if (Contents.TakeContents(Data.data,Data.size) == true)
return true;
}
CurStat.Flags &= ~FlContents;
}
if(OpenDebFile() == false)
return false;
Stats.Misses++;
if (Contents.Read(*DebFile) == false)
return false;
// Write back the control information
InitQueryContent();
if (Put(Contents.Data,Contents.CurSize) == true)
CurStat.Flags |= FlContents;
return true;
}
/*}}}*/
// CacheDB::GetHashes - Get the hashes /*{{{*/
static std::string bytes2hex(uint8_t *bytes, size_t length) {
char buf[3];
std::string space;
space.reserve(length*2 + 1);
for (size_t i = 0; i < length; i++) {
snprintf(buf, sizeof(buf), "%02x", bytes[i]);
space.append(buf);
}
return space;
}
static inline unsigned char xdig2num(char const &dig) {
if (isdigit(dig)) return dig - '0';
if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
return 0;
}
static void hex2bytes(uint8_t *bytes, const char *hex, int length) {
while (length-- > 0) {
*bytes = 0;
if (isxdigit(hex[0]) && isxdigit(hex[1])) {
*bytes = xdig2num(hex[0]) * 16 + xdig2num(hex[1]);
hex += 2;
}
bytes++;
}
}
bool CacheDB::GetHashes(bool const GenOnly, unsigned int const DoHashes)
{
unsigned int notCachedHashes = 0;
if ((CurStat.Flags & FlMD5) != FlMD5)
{
notCachedHashes = notCachedHashes | Hashes::MD5SUM;
}
if ((CurStat.Flags & FlSHA1) != FlSHA1)
{
notCachedHashes = notCachedHashes | Hashes::SHA1SUM;
}
if ((CurStat.Flags & FlSHA256) != FlSHA256)
{
notCachedHashes = notCachedHashes | Hashes::SHA256SUM;
}
if ((CurStat.Flags & FlSHA512) != FlSHA512)
{
notCachedHashes = notCachedHashes | Hashes::SHA512SUM;
}
unsigned int FlHashes = DoHashes & notCachedHashes;
HashesList.clear();
if (FlHashes != 0)
{
if (OpenFile() == false)
return false;
Hashes hashes(FlHashes);
if (Fd->Seek(0) == false || hashes.AddFD(*Fd, CurStat.FileSize) == false)
return false;
HashStringList hl = hashes.GetHashStringList();
for (HashStringList::const_iterator hs = hl.begin(); hs != hl.end(); ++hs)
{
HashesList.push_back(*hs);
if (strcasecmp(hs->HashType().c_str(), "SHA512") == 0)
{
Stats.SHA512Bytes += CurStat.FileSize;
hex2bytes(CurStat.SHA512, hs->HashValue().data(), sizeof(CurStat.SHA512));
CurStat.Flags |= FlSHA512;
}
else if (strcasecmp(hs->HashType().c_str(), "SHA256") == 0)
{
Stats.SHA256Bytes += CurStat.FileSize;
hex2bytes(CurStat.SHA256, hs->HashValue().data(), sizeof(CurStat.SHA256));
CurStat.Flags |= FlSHA256;
}
else if (strcasecmp(hs->HashType().c_str(), "SHA1") == 0)
{
Stats.SHA1Bytes += CurStat.FileSize;
hex2bytes(CurStat.SHA1, hs->HashValue().data(), sizeof(CurStat.SHA1));
CurStat.Flags |= FlSHA1;
}
else if (strcasecmp(hs->HashType().c_str(), "MD5Sum") == 0)
{
Stats.MD5Bytes += CurStat.FileSize;
hex2bytes(CurStat.MD5, hs->HashValue().data(), sizeof(CurStat.MD5));
CurStat.Flags |= FlMD5;
}
else if (strcasecmp(hs->HashType().c_str(), "Checksum-FileSize") == 0)
{
// we store it in a different field already
}
else
return _error->Error("Got unknown unrequested hashtype %s", hs->HashType().c_str());
}
}
if (GenOnly == true)
return true;
bool ret = true;
#define PUSH_BACK_HASH(FLAG, TYPE, VALUE) \
if ((CurStat.Flags & FLAG) == FLAG) \
ret &= HashesList.push_back(HashString(TYPE, bytes2hex(VALUE, sizeof(VALUE))));
PUSH_BACK_HASH(FlMD5, "MD5Sum", CurStat.MD5);
PUSH_BACK_HASH(FlSHA1, "SHA1", CurStat.SHA1);
PUSH_BACK_HASH(FlSHA256, "SHA256", CurStat.SHA256);
PUSH_BACK_HASH(FlSHA512, "SHA512", CurStat.SHA512);
return ret;
}
/*}}}*/
// CacheDB::Finish - Write back the cache structure /*{{{*/
// ---------------------------------------------------------------------
/* */
bool CacheDB::Finish()
{
// Optimize away some writes.
if (CurStat.Flags == OldStat.Flags &&
CurStat.mtime == OldStat.mtime)
return true;
// Write the stat information
CurStat.Flags = htonl(CurStat.Flags);
CurStat.FileSize = htonl(CurStat.FileSize);
InitQueryStats();
Put(&CurStat,sizeof(CurStat));
CurStat.Flags = ntohl(CurStat.Flags);
CurStat.FileSize = ntohl(CurStat.FileSize);
return true;
}
/*}}}*/
// CacheDB::Clean - Clean the Database /*{{{*/
// ---------------------------------------------------------------------
/* Tidy the database by removing files that no longer exist at all. */
bool CacheDB::Clean()
{
if (DBLoaded == false)
return true;
/* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
needs the lower one and 2.7.7 needs the upper.. */
DBC *Cursor;
if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
return _error->Error(_("Unable to get a cursor"));
DBT Key;
DBT Data;
memset(&Key,0,sizeof(Key));
memset(&Data,0,sizeof(Data));
while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
{
const char *Colon = (char*)memrchr(Key.data, ':', Key.size);
if (Colon)
{
if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 ||
stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 ||
stringcmp(Colon + 1, (char *)Key.data+Key.size,"cs") == 0 ||
stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
{
std::string FileName = std::string((const char *)Key.data,Colon);
if (FileExists(FileName) == true) {
continue;
}
}
}
Cursor->c_del(Cursor,0);
}
int res = Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
if (res < 0)
_error->Warning("compact failed with result %i", res);
if(_config->FindB("Debug::APT::FTPArchive::Clean", false) == true)
Dbp->stat_print(Dbp, 0);
return true;
}
/*}}}*/
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