// -*- 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/md5.h> #include <apt-pkg/sha1.h> #include <apt-pkg/sha2.h> #include <apt-pkg/strutl.h> #include <ctype.h> #include <netinet/in.h> // htonl, etc #include <stddef.h> #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; } /*}}}*/