Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 1 | /* |
Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 2 | Copyright (C) 2006-2008 Werner Dittmann |
Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 5 | it under the terms of the GNU General Public License as published by |
Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 6 | the Free Software Foundation, either version 3 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Authors: Werner Dittmann <Werner.Dittmann@t-online.de> |
| 20 | */ |
| 21 | // #define UNIT_TEST |
| 22 | |
| 23 | #include <string> |
| 24 | #include <stdlib.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #include <crypto/zrtpDH.h> |
| 28 | |
| 29 | #include <libzrtpcpp/ZIDCacheFile.h> |
| 30 | |
| 31 | |
| 32 | static ZIDCacheFile* instance; |
| 33 | static int errors = 0; // maybe we will use as member of ZIDCache later... |
| 34 | |
| 35 | |
| 36 | /** |
| 37 | * A poor man's factory. |
| 38 | * |
| 39 | * The build process must not allow two cache file implementation classes linked |
| 40 | * into the same library. |
| 41 | */ |
| 42 | |
| 43 | ZIDCache* getZidCacheInstance() { |
| 44 | |
| 45 | if (instance == NULL) { |
| 46 | instance = new ZIDCacheFile(); |
| 47 | } |
| 48 | return instance; |
| 49 | } |
| 50 | |
| 51 | |
| 52 | void ZIDCacheFile::createZIDFile(char* name) { |
| 53 | zidFile = fopen(name, "wb+"); |
| 54 | // New file, generate an associated random ZID and save |
| 55 | // it as first record |
| 56 | if (zidFile != NULL) { |
| 57 | randomZRTP(associatedZid, IDENTIFIER_LEN); |
| 58 | |
| 59 | ZIDRecordFile rec; |
| 60 | rec.setZid(associatedZid); |
| 61 | rec.setOwnZIDRecord(); |
| 62 | fseek(zidFile, 0L, SEEK_SET); |
| 63 | if (fwrite(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) < 1) |
| 64 | ++errors; |
| 65 | fflush(zidFile); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Migrate old ZID file format to new one. |
| 71 | * |
| 72 | * If ZID file is old format: |
| 73 | * - close it, rename it, then re-open |
| 74 | * - create ZID file for new format |
| 75 | * - copy over contents and flags. |
| 76 | */ |
| 77 | void ZIDCacheFile::checkDoMigration(char* name) { |
| 78 | FILE* fdOld; |
| 79 | unsigned char inb[2]; |
| 80 | zidrecord1_t recOld; |
| 81 | |
| 82 | fseek(zidFile, 0L, SEEK_SET); |
| 83 | if (fread(inb, 2, 1, zidFile) < 1) { |
| 84 | ++errors; |
| 85 | inb[0] = 0; |
| 86 | } |
| 87 | |
| 88 | if (inb[0] > 0) { // if it's new format just return |
| 89 | return; |
| 90 | } |
| 91 | fclose(zidFile); // close old ZID file |
| 92 | zidFile = NULL; |
| 93 | |
| 94 | // create save file name, rename and re-open |
| 95 | // if rename fails, just unlink old ZID file and create a brand new file |
| 96 | // just a little inconvenience for the user, need to verify new SAS |
| 97 | std::string fn = std::string(name) + std::string(".save"); |
| 98 | if (rename(name, fn.c_str()) < 0) { |
| 99 | unlink(name); |
| 100 | createZIDFile(name); |
| 101 | return; |
| 102 | } |
| 103 | fdOld = fopen(fn.c_str(), "rb"); // reopen old format in read only mode |
| 104 | |
| 105 | // Get first record from old file - is the own ZID |
| 106 | fseek(fdOld, 0L, SEEK_SET); |
| 107 | if (fread(&recOld, sizeof(zidrecord1_t), 1, fdOld) != 1) { |
| 108 | fclose(fdOld); |
| 109 | return; |
| 110 | } |
| 111 | if (recOld.ownZid != 1) { |
| 112 | fclose(fdOld); |
| 113 | return; |
| 114 | } |
| 115 | zidFile = fopen(name, "wb+"); // create new format file in binary r/w mode |
| 116 | if (zidFile == NULL) { |
| 117 | return; |
| 118 | } |
| 119 | // create ZIDRecord in new format, copy over own ZID and write the record |
| 120 | ZIDRecordFile rec; |
| 121 | rec.setZid(recOld.identifier); |
| 122 | rec.setOwnZIDRecord(); |
| 123 | if (fwrite(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) < 1) |
| 124 | ++errors; |
| 125 | |
| 126 | // now copy over all valid records from old ZID file format. |
| 127 | // Sequentially read old records, sequentially write new records |
| 128 | int numRead; |
| 129 | do { |
| 130 | numRead = fread(&recOld, sizeof(zidrecord1_t), 1, fdOld); |
| 131 | if (numRead == 0) { // all old records processed |
| 132 | break; |
| 133 | } |
| 134 | // skip own ZID record and invalid records |
| 135 | if (recOld.ownZid == 1 || recOld.recValid == 0) { |
| 136 | continue; |
| 137 | } |
| 138 | ZIDRecordFile rec2; |
| 139 | rec2.setZid(recOld.identifier); |
| 140 | rec2.setValid(); |
| 141 | if (recOld.rs1Valid & SASVerified) { |
| 142 | rec2.setSasVerified(); |
| 143 | } |
| 144 | rec2.setNewRs1(recOld.rs2Data); // TODO: check squenec |
| 145 | rec2.setNewRs1(recOld.rs1Data); |
| 146 | if (fwrite(rec2.getRecordData(), rec2.getRecordLength(), 1, zidFile) < 1) |
| 147 | ++errors; |
| 148 | |
| 149 | } while (numRead == 1); |
| 150 | fflush(zidFile); |
| 151 | } |
| 152 | |
| 153 | ZIDCacheFile::~ZIDCacheFile() { |
| 154 | close(); |
| 155 | } |
| 156 | |
| 157 | int ZIDCacheFile::open(char* name) { |
| 158 | |
| 159 | // check for an already active ZID file |
| 160 | if (zidFile != NULL) { |
| 161 | return 0; |
| 162 | } |
| 163 | if ((zidFile = fopen(name, "rb+")) == NULL) { |
| 164 | createZIDFile(name); |
| 165 | } else { |
| 166 | checkDoMigration(name); |
| 167 | if (zidFile != NULL) { |
| 168 | ZIDRecordFile rec; |
| 169 | fseek(zidFile, 0L, SEEK_SET); |
| 170 | if (fread(rec.getRecordData(), rec.getRecordLength(), 1, zidFile) != 1) { |
| 171 | fclose(zidFile); |
| 172 | zidFile = NULL; |
| 173 | return -1; |
| 174 | } |
| 175 | if (!rec.isOwnZIDRecord()) { |
| 176 | fclose(zidFile); |
| 177 | zidFile = NULL; |
| 178 | return -1; |
| 179 | } |
| 180 | memcpy(associatedZid, rec.getIdentifier(), IDENTIFIER_LEN); |
| 181 | } |
| 182 | } |
| 183 | return ((zidFile == NULL) ? -1 : 1); |
| 184 | } |
| 185 | |
| 186 | void ZIDCacheFile::close() { |
| 187 | |
| 188 | if (zidFile != NULL) { |
| 189 | fclose(zidFile); |
| 190 | zidFile = NULL; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | ZIDRecord *ZIDCacheFile::getRecord(unsigned char *zid) { |
| 195 | unsigned long pos; |
| 196 | int numRead; |
| 197 | // ZIDRecordFile rec; |
| 198 | ZIDRecordFile *zidRecord = new ZIDRecordFile(); |
| 199 | |
| 200 | // set read pointer behind first record ( |
| 201 | fseek(zidFile, zidRecord->getRecordLength(), SEEK_SET); |
| 202 | |
| 203 | do { |
| 204 | pos = ftell(zidFile); |
| 205 | numRead = fread(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile); |
| 206 | if (numRead == 0) { |
| 207 | break; |
| 208 | } |
| 209 | |
| 210 | // skip own ZID record and invalid records |
| 211 | if (zidRecord->isOwnZIDRecord() || !zidRecord->isValid()) { |
| 212 | continue; |
| 213 | } |
| 214 | |
| 215 | } while (numRead == 1 && |
| 216 | memcmp(zidRecord->getIdentifier(), zid, IDENTIFIER_LEN) != 0); |
| 217 | |
| 218 | // If we reached end of file, then no record with the ZID |
| 219 | // found. We need to create a new ZID record. |
| 220 | if (numRead == 0) { |
| 221 | // create new record |
| 222 | // ZIDRecordFile rec1; |
| 223 | zidRecord->setZid(zid); |
| 224 | zidRecord->setValid(); |
| 225 | if (fwrite(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile) < 1) |
| 226 | ++errors; |
| 227 | } |
| 228 | // remember position of record in file for save operation |
| 229 | zidRecord->setPosition(pos); |
| 230 | return zidRecord; |
| 231 | } |
| 232 | |
| 233 | unsigned int ZIDCacheFile::saveRecord(ZIDRecord *zidRec) { |
| 234 | ZIDRecordFile *zidRecord = reinterpret_cast<ZIDRecordFile *>(zidRec); |
| 235 | |
| 236 | fseek(zidFile, zidRecord->getPosition(), SEEK_SET); |
| 237 | if (fwrite(zidRecord->getRecordData(), zidRecord->getRecordLength(), 1, zidFile) < 1) |
| 238 | ++errors; |
| 239 | fflush(zidFile); |
| 240 | return 1; |
| 241 | } |
| 242 | |
| 243 | int32_t ZIDCacheFile::getPeerName(const uint8_t *peerZid, std::string *name) { |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | void ZIDCacheFile::putPeerName(const uint8_t *peerZid, const std::string name) { |
| 248 | return; |
| 249 | } |