| /* |
| Copyright (C) 2006-2013 Werner Dittmann |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| /* |
| * Authors: Werner Dittmann <Werner.Dittmann@t-online.de> |
| */ |
| // #define UNIT_TEST |
| |
| #include <string> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include <crypto/zrtpDH.h> |
| |
| #include <libzrtpcpp/ZIDCacheFile.h> |
| |
| |
| static ZIDCacheFile* instance; |
| static int errors = 0; // maybe we will use as member of ZIDCache later... |
| |
| |
| /** |
| * A poor man's factory. |
| * |
| * The build process must not allow two cache file implementation classes linked |
| * into the same library. |
| */ |
| |
| ZIDCache* getZidCacheInstance() { |
| |
| if (instance == NULL) { |
| instance = new ZIDCacheFile(); |
| } |
| return instance; |
| } |
| |
| |
| void ZIDCacheFile::createZIDFile(char* name) { |
| zidFile = fopen(name, "wb+"); |
| // New file, generate an associated random ZID and save |
| // it as first record |
| if (zidFile != NULL) { |
| randomZRTP(associatedZid, IDENTIFIER_LEN); |
| |
| ZIDRecordFile rec; |
| rec.setZid(associatedZid); |
| rec.setOwnZIDRecord(); |
| fseek(zidFile, 0L, SEEK_SET); |
| if (fwrite(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) < 1) |
| ++errors; |
| fflush(zidFile); |
| } |
| } |
| |
| /** |
| * Migrate old ZID file format to new one. |
| * |
| * If ZID file is old format: |
| * - close it, rename it, then re-open |
| * - create ZID file for new format |
| * - copy over contents and flags. |
| */ |
| void ZIDCacheFile::checkDoMigration(char* name) { |
| FILE* fdOld; |
| unsigned char inb[2]; |
| zidrecord1_t recOld; |
| |
| fseek(zidFile, 0L, SEEK_SET); |
| if (fread(inb, 2, 1, zidFile) < 1) { |
| ++errors; |
| inb[0] = 0; |
| } |
| |
| if (inb[0] > 0) { // if it's new format just return |
| return; |
| } |
| fclose(zidFile); // close old ZID file |
| zidFile = NULL; |
| |
| // create save file name, rename and re-open |
| // if rename fails, just unlink old ZID file and create a brand new file |
| // just a little inconvenience for the user, need to verify new SAS |
| std::string fn = std::string(name) + std::string(".save"); |
| if (rename(name, fn.c_str()) < 0) { |
| unlink(name); |
| createZIDFile(name); |
| return; |
| } |
| fdOld = fopen(fn.c_str(), "rb"); // reopen old format in read only mode |
| |
| // Get first record from old file - is the own ZID |
| fseek(fdOld, 0L, SEEK_SET); |
| if (fread(&recOld, sizeof(zidrecord1_t), 1, fdOld) != 1) { |
| fclose(fdOld); |
| return; |
| } |
| if (recOld.ownZid != 1) { |
| fclose(fdOld); |
| return; |
| } |
| zidFile = fopen(name, "wb+"); // create new format file in binary r/w mode |
| if (zidFile == NULL) { |
| return; |
| } |
| // create ZIDRecord in new format, copy over own ZID and write the record |
| ZIDRecordFile rec; |
| rec.setZid(recOld.identifier); |
| rec.setOwnZIDRecord(); |
| if (fwrite(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) < 1) |
| ++errors; |
| |
| // now copy over all valid records from old ZID file format. |
| // Sequentially read old records, sequentially write new records |
| int numRead; |
| do { |
| numRead = fread(&recOld, sizeof(zidrecord1_t), 1, fdOld); |
| if (numRead == 0) { // all old records processed |
| break; |
| } |
| // skip own ZID record and invalid records |
| if (recOld.ownZid == 1 || recOld.recValid == 0) { |
| continue; |
| } |
| ZIDRecordFile rec2; |
| rec2.setZid(recOld.identifier); |
| rec2.setValid(); |
| if (recOld.rs1Valid & SASVerified) { |
| rec2.setSasVerified(); |
| } |
| rec2.setNewRs1(recOld.rs2Data); // TODO: check squenec |
| rec2.setNewRs1(recOld.rs1Data); |
| if (fwrite(rec2.getRecordData(), rec2.getRecordLength(), 1, zidFile) < 1) |
| ++errors; |
| |
| } while (numRead == 1); |
| fflush(zidFile); |
| } |
| |
| ZIDCacheFile::~ZIDCacheFile() { |
| close(); |
| } |
| |
| int ZIDCacheFile::open(char* name) { |
| |
| // check for an already active ZID file |
| if (zidFile != NULL) { |
| return 0; |
| } |
| if ((zidFile = fopen(name, "rb+")) == NULL) { |
| createZIDFile(name); |
| } else { |
| checkDoMigration(name); |
| if (zidFile != NULL) { |
| ZIDRecordFile rec; |
| fseek(zidFile, 0L, SEEK_SET); |
| if (fread(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) != 1) { |
| fclose(zidFile); |
| zidFile = NULL; |
| return -1; |
| } |
| if (!rec.isOwnZIDRecord()) { |
| fclose(zidFile); |
| zidFile = NULL; |
| return -1; |
| } |
| memcpy(associatedZid, rec.getIdentifier(), IDENTIFIER_LEN); |
| } |
| } |
| return ((zidFile == NULL) ? -1 : 1); |
| } |
| |
| void ZIDCacheFile::close() { |
| |
| if (zidFile != NULL) { |
| fclose(zidFile); |
| zidFile = NULL; |
| } |
| } |
| |
| ZIDRecord *ZIDCacheFile::getRecord(unsigned char *zid) { |
| unsigned long pos; |
| int numRead; |
| // ZIDRecordFile rec; |
| ZIDRecordFile *zidRecord = new ZIDRecordFile(); |
| |
| // set read pointer behind first record ( |
| fseek(zidFile, zidRecord->getRecordLength(), SEEK_SET); |
| |
| do { |
| pos = ftell(zidFile); |
| numRead = fread(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile); |
| if (numRead == 0) { |
| break; |
| } |
| |
| // skip own ZID record and invalid records |
| if (zidRecord->isOwnZIDRecord() || !zidRecord->isValid()) { |
| continue; |
| } |
| |
| } while (numRead == 1 && |
| memcmp(zidRecord->getIdentifier(), zid, IDENTIFIER_LEN) != 0); |
| |
| // If we reached end of file, then no record with the ZID |
| // found. We need to create a new ZID record. |
| if (numRead == 0) { |
| // create new record |
| // ZIDRecordFile rec1; |
| zidRecord->setZid(zid); |
| zidRecord->setValid(); |
| if (fwrite(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile) < 1) |
| ++errors; |
| } |
| // remember position of record in file for save operation |
| zidRecord->setPosition(pos); |
| return zidRecord; |
| } |
| |
| unsigned int ZIDCacheFile::saveRecord(ZIDRecord *zidRec) { |
| ZIDRecordFile *zidRecord = reinterpret_cast<ZIDRecordFile *>(zidRec); |
| |
| fseek(zidFile, zidRecord->getPosition(), SEEK_SET); |
| if (fwrite(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile) < 1) |
| ++errors; |
| fflush(zidFile); |
| return 1; |
| } |
| |
| int32_t ZIDCacheFile::getPeerName(const uint8_t *peerZid, std::string *name) { |
| return 0; |
| } |
| |
| void ZIDCacheFile::putPeerName(const uint8_t *peerZid, const std::string name) { |
| return; |
| } |