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-rw-r--r--ftparchive/cachedb.cc579
1 files changed, 579 insertions, 0 deletions
diff --git a/ftparchive/cachedb.cc b/ftparchive/cachedb.cc
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--- /dev/null
+++ b/ftparchive/cachedb.cc
@@ -0,0 +1,579 @@
+// -*- 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;
+}
+ /*}}}*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 07:02:53 +0000