// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: cachedb.cc,v 1.7 2004/05/08 19:41:01 mdz Exp $ /* ###################################################################### CacheDB Simple uniform interface to a cache database. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include "cachedb.h" #include <apti18n.h> #include <apt-pkg/error.h> #include <apt-pkg/md5.h> #include <apt-pkg/sha1.h> #include <apt-pkg/sha256.h> #include <apt-pkg/strutl.h> #include <apt-pkg/configuration.h> #include <netinet/in.h> // htonl, etc /*}}}*/ // CacheDB::ReadyDB - Ready the DB2 /*{{{*/ // --------------------------------------------------------------------- /* This opens the DB2 file for caching package information */ bool CacheDB::ReadyDB(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 = 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() { Fd = new FileFd(FileName,FileFd::ReadOnly); if (_error->PendingError() == true) { delete Fd; Fd = NULL; return false; } return true; } /*}}}*/ // 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) { /* Already worked out the file size */ } else { /* Get it from the file. */ if (Fd == NULL && OpenFile() == false) { return false; } // Stat the file struct stat St; if (fstat(Fd->Fd(),&St) != 0) { 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::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) { /* First see if there is anything about it in the database */ /* Get the flags (and mtime) */ InitQuery("st"); // Ensure alignment of the returned structure Data.data = &CurStat; Data.ulen = sizeof(CurStat); Data.flags = DB_DBT_USERMEM; if (Get() == false) { CurStat.Flags = 0; } CurStat.Flags = ntohl(CurStat.Flags); CurStat.FileSize = ntohl(CurStat.FileSize); } return true; } /*}}}*/ // CacheDB::GetFileInfo - Get all the info about the file /*{{{*/ // --------------------------------------------------------------------- bool CacheDB::GetFileInfo(string const &FileName, bool const &DoControl, bool const &DoContents, bool const &GenContentsOnly, bool const &DoMD5, bool const &DoSHA1, bool const &DoSHA256, bool const &checkMtime) { this->FileName = FileName; if (GetCurStat() == false) { return false; } OldStat = CurStat; if (GetFileStat(checkMtime) == false) { delete Fd; Fd = NULL; 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) || (DoMD5 && GetMD5(false) == false) || (DoSHA1 && GetSHA1(false) == false) || (DoSHA256 && GetSHA256(false) == false)) { delete Fd; Fd = NULL; delete DebFile; DebFile = NULL; return false; } delete Fd; Fd = NULL; delete DebFile; DebFile = NULL; 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 InitQuery("cl"); if (Get() == true && Control.TakeControl(Data.data,Data.size) == true) return true; CurStat.Flags &= ~FlControl; } if (Fd == NULL && OpenFile() == false) { return false; } // Create a deb instance to read the archive if (DebFile == 0) { DebFile = new debDebFile(*Fd); if (_error->PendingError() == true) 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 InitQuery("cl"); 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 InitQuery("cn"); if (Get() == true) { if (Contents.TakeContents(Data.data,Data.size) == true) return true; } CurStat.Flags &= ~FlContents; } if (Fd == NULL && OpenFile() == false) { return false; } // Create a deb instance to read the archive if (DebFile == 0) { DebFile = new debDebFile(*Fd); if (_error->PendingError() == true) return false; } if (Contents.Read(*DebFile) == false) return false; // Write back the control information InitQuery("cn"); if (Put(Contents.Data,Contents.CurSize) == true) CurStat.Flags |= FlContents; return true; } /*}}}*/ static string bytes2hex(uint8_t *bytes, size_t length) { char space[65]; if (length * 2 > sizeof(space) - 1) length = (sizeof(space) - 1) / 2; for (size_t i = 0; i < length; i++) snprintf(&space[i*2], 3, "%02x", bytes[i]); return string(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++; } } // CacheDB::GetMD5 - Get the MD5 hash /*{{{*/ // --------------------------------------------------------------------- /* */ bool CacheDB::GetMD5(bool const &GenOnly) { // Try to read the control information out of the DB. if ((CurStat.Flags & FlMD5) == FlMD5) { if (GenOnly == true) return true; MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5)); return true; } Stats.MD5Bytes += CurStat.FileSize; if (Fd == NULL && OpenFile() == false) { return false; } MD5Summation MD5; if (Fd->Seek(0) == false || MD5.AddFD(Fd->Fd(),CurStat.FileSize) == false) return false; MD5Res = MD5.Result(); hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5)); CurStat.Flags |= FlMD5; return true; } /*}}}*/ // CacheDB::GetSHA1 - Get the SHA1 hash /*{{{*/ // --------------------------------------------------------------------- /* */ bool CacheDB::GetSHA1(bool const &GenOnly) { // Try to read the control information out of the DB. if ((CurStat.Flags & FlSHA1) == FlSHA1) { if (GenOnly == true) return true; SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1)); return true; } Stats.SHA1Bytes += CurStat.FileSize; if (Fd == NULL && OpenFile() == false) { return false; } SHA1Summation SHA1; if (Fd->Seek(0) == false || SHA1.AddFD(Fd->Fd(),CurStat.FileSize) == false) return false; SHA1Res = SHA1.Result(); hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1)); CurStat.Flags |= FlSHA1; return true; } /*}}}*/ // CacheDB::GetSHA256 - Get the SHA256 hash /*{{{*/ // --------------------------------------------------------------------- /* */ bool CacheDB::GetSHA256(bool const &GenOnly) { // Try to read the control information out of the DB. if ((CurStat.Flags & FlSHA256) == FlSHA256) { if (GenOnly == true) return true; SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256)); return true; } Stats.SHA256Bytes += CurStat.FileSize; if (Fd == NULL && OpenFile() == false) { return false; } SHA256Summation SHA256; if (Fd->Seek(0) == false || SHA256.AddFD(Fd->Fd(),CurStat.FileSize) == false) return false; SHA256Res = SHA256.Result(); hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256)); CurStat.Flags |= FlSHA256; return true; } /*}}}*/ // 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); InitQuery("st"); 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,"cn") == 0) { if (FileExists(string((const char *)Key.data,Colon)) == true) continue; } } Cursor->c_del(Cursor,0); } Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL); return true; } /*}}}*/