Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1 | /* |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 2 | Copyright (C) 2006-2008 Werner Dittmann |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 3 | |
| 4 | This program is free software: you can redistribute it and/or modify |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 5 | it under the terms of the GNU General Public License as published by |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -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 | * @author Werner Dittmann <Werner.Dittmann@t-online.de> |
| 20 | */ |
| 21 | |
| 22 | #include <iostream> |
| 23 | #include <cstdlib> |
| 24 | #include <ctype.h> |
| 25 | |
| 26 | #include <libzrtpcpp/ZRtp.h> |
| 27 | #include <libzrtpcpp/ZrtpStateClass.h> |
| 28 | |
| 29 | using namespace std; |
| 30 | using namespace GnuZrtpCodes; |
| 31 | |
| 32 | state_t states[numberOfStates] = { |
| 33 | {Initial, &ZrtpStateClass::evInitial }, |
| 34 | {Detect, &ZrtpStateClass::evDetect }, |
| 35 | {AckDetected, &ZrtpStateClass::evAckDetected }, |
| 36 | {AckSent, &ZrtpStateClass::evAckSent }, |
| 37 | {WaitCommit, &ZrtpStateClass::evWaitCommit }, |
| 38 | {CommitSent, &ZrtpStateClass::evCommitSent }, |
| 39 | {WaitDHPart2, &ZrtpStateClass::evWaitDHPart2 }, |
| 40 | {WaitConfirm1, &ZrtpStateClass::evWaitConfirm1 }, |
| 41 | {WaitConfirm2, &ZrtpStateClass::evWaitConfirm2 }, |
| 42 | {WaitConfAck, &ZrtpStateClass::evWaitConfAck }, |
| 43 | {WaitClearAck, &ZrtpStateClass::evWaitClearAck }, |
| 44 | {SecureState, &ZrtpStateClass::evSecureState }, |
| 45 | {WaitErrorAck, &ZrtpStateClass::evWaitErrorAck } |
| 46 | }; |
| 47 | |
| 48 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 49 | ZrtpStateClass::ZrtpStateClass(ZRtp *p) { |
| 50 | parent = p; |
| 51 | secSubstate = Normal; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 52 | engine = new ZrtpStates(states, numberOfStates, Initial); |
| 53 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 54 | commitPkt = NULL; |
| 55 | multiStream = false; |
| 56 | |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 57 | // Set up timers according to ZRTP spec |
| 58 | T1.start = 50; |
| 59 | T1.maxResend = 20; |
| 60 | T1.capping = 200; |
| 61 | |
| 62 | T2.start = 150; |
| 63 | T2.maxResend = 10; |
| 64 | T2.capping = 600; |
| 65 | } |
| 66 | |
| 67 | ZrtpStateClass::~ZrtpStateClass(void) { |
| 68 | |
| 69 | // If not in Initial state: close the protocol engine |
| 70 | // before destroying it. This will free pending packets |
| 71 | // if necessary. |
| 72 | if (!inState(Initial)) { |
| 73 | Event_t ev; |
| 74 | |
| 75 | cancelTimer(); |
| 76 | ev.type = ZrtpClose; |
| 77 | event = &ev; |
| 78 | engine->processEvent(*this); |
| 79 | } |
| 80 | delete engine; |
| 81 | } |
| 82 | |
| 83 | void ZrtpStateClass::processEvent(Event_t *ev) { |
| 84 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 85 | event = ev; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 86 | char *msg, first, middle, last; |
| 87 | uint8_t *pkt; |
| 88 | |
| 89 | parent->synchEnter(); |
| 90 | |
| 91 | if (event->type == ZrtpPacket) { |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 92 | pkt = event->packet; |
| 93 | msg = (char *)pkt + 4; |
| 94 | first = tolower(*msg); |
| 95 | middle = tolower(*(msg+4)); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 96 | last = tolower(*(msg+7)); |
| 97 | |
| 98 | // Check if this is an Error packet. |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 99 | if (first == 'e' && middle =='r' && last == ' ') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 100 | /* |
| 101 | * Process a received Error packet. |
| 102 | * |
| 103 | * In any case stop timer to prevent resending packets. |
| 104 | * Use callback method to prepare and get an ErrorAck packet. |
| 105 | * Modify event type to "ErrorPkt" and hand it over to current |
| 106 | * state for further processing. |
| 107 | */ |
| 108 | cancelTimer(); |
| 109 | ZrtpPacketError epkt(pkt); |
| 110 | ZrtpPacketErrorAck* eapkt = parent->prepareErrorAck(&epkt); |
| 111 | parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(eapkt)); |
| 112 | event->type = ErrorPkt; |
| 113 | } |
| 114 | else if (first == 'p' && middle == ' ' && last == ' ') { |
| 115 | ZrtpPacketPing ppkt(pkt); |
| 116 | ZrtpPacketPingAck* ppktAck = parent->preparePingAck(&ppkt); |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 117 | parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(ppktAck)); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 118 | parent->synchLeave(); |
| 119 | return; |
| 120 | } |
| 121 | else if (first == 's' && last == 'y') { |
| 122 | uint32_t errorCode = 0; |
| 123 | ZrtpPacketSASrelay* srly = new ZrtpPacketSASrelay(pkt); |
| 124 | ZrtpPacketRelayAck* rapkt = parent->prepareRelayAck(srly, &errorCode); |
| 125 | parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(rapkt)); |
| 126 | parent->synchLeave(); |
| 127 | return; |
| 128 | } |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 129 | |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 130 | } |
| 131 | /* |
| 132 | * Shut down protocol state engine: cancel outstanding timer, further |
| 133 | * processing in current state. |
| 134 | */ |
| 135 | else if (event->type == ZrtpClose) { |
| 136 | cancelTimer(); |
| 137 | } |
| 138 | engine->processEvent(*this); |
| 139 | parent->synchLeave(); |
| 140 | } |
| 141 | |
| 142 | |
| 143 | void ZrtpStateClass::evInitial(void) { |
| 144 | DEBUGOUT((cout << "Checking for match in Initial.\n")); |
| 145 | |
| 146 | if (event->type == ZrtpInitial) { |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 147 | ZrtpPacketHello* hello = parent->prepareHello(); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 148 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 149 | // remember packet for easy resend in case timer triggers |
| 150 | sentPacket = static_cast<ZrtpPacketBase *>(hello); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 151 | |
| 152 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 153 | sendFailed(); // returns to state Initial |
| 154 | return; |
| 155 | } |
| 156 | if (startTimer(&T1) <= 0) { |
| 157 | timerFailed(SevereNoTimer); // returns to state Initial |
| 158 | return; |
| 159 | } |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 160 | nextState(Detect); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 161 | } |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Detect state. |
| 166 | * |
| 167 | * When in this state the protocol engine sent an initial Hello packet |
| 168 | * to the peer. |
| 169 | * |
| 170 | * When entering this state transition function then: |
| 171 | * - Assume Initiator mode, mode may change later on peer reaction |
| 172 | * - Instance variable sentPacket contains the sent Hello packet |
| 173 | * - Hello timer T1 may be active. This is the case if the other peer |
| 174 | * has prepared its RTP session and answers our Hello packets nearly |
| 175 | * immediately, i.e. before the Hello timeout counter expires. If the |
| 176 | * other peer does not send a Hello during this time the state engine |
| 177 | * reports "other peer does not support ZRTP" but stays |
| 178 | * in state Detect with no active timer (passiv mode). Staying in state |
| 179 | * Detect allows another peer to start its detect phase any time later. |
| 180 | * |
| 181 | * This restart capability is the reason why we use "startTimer(&T1)" in |
| 182 | * case we received a Hello packet from another peer. This effectively |
| 183 | * restarts the Hello timeout counter. |
| 184 | * |
| 185 | * In this state we also handle ZrtpInitialize event. This forces a |
| 186 | * restart of ZRTP discovery if an application calls ZrtpQueue#startZrtp |
| 187 | * again. This may happen after a previous discovery phase were not |
| 188 | * successful. |
| 189 | * |
| 190 | * Usually applications use some sort of signaling protocol, for example |
| 191 | * SIP, to negotiate the RTP parameters. Thus the RTP sessions setup is |
| 192 | * fairly sychronized and thus also the ZRTP detection phase. Applications |
| 193 | * that use some other ways to setup the RTP sessions this restart capability |
| 194 | * comes in handy because no RTP setup sychronization is necessary. |
| 195 | * |
| 196 | * Possible events in this state are: |
| 197 | * - timeout for sent Hello packet: causes a resend check and |
| 198 | * repeat sending of Hello packet |
| 199 | * - received a HelloAck: stop active timer, prepare and send Hello packet, |
| 200 | * switch to state AckDeteced. |
| 201 | * - received a Hello: stop active timer, send HelloAck, prepare Commit |
| 202 | * packet, switch to state AckSent. |
| 203 | * |
| 204 | */ |
| 205 | void ZrtpStateClass::evDetect(void) { |
| 206 | |
| 207 | DEBUGOUT((cout << "Checking for match in Detect.\n")); |
| 208 | |
| 209 | char *msg, first, last; |
| 210 | uint8_t *pkt; |
| 211 | uint32_t errorCode = 0; |
| 212 | |
| 213 | /* |
| 214 | * First check the general event type, then discrimnate |
| 215 | * the real event. |
| 216 | */ |
| 217 | if (event->type == ZrtpPacket) { |
| 218 | pkt = event->packet; |
| 219 | msg = (char *)pkt + 4; |
| 220 | |
| 221 | first = tolower(*msg); |
| 222 | last = tolower(*(msg+7)); |
| 223 | /* |
| 224 | * HelloAck: |
| 225 | * - our peer acknowledged our Hello packet, we have not seen the peer's Hello yet |
| 226 | * - cancel timer T1 to stop resending Hello |
| 227 | * - switch to state AckDetected, wait for peer's Hello (F3) |
| 228 | */ |
| 229 | if (first == 'h' && last =='k') { |
| 230 | cancelTimer(); |
| 231 | sentPacket = NULL; |
| 232 | nextState(AckDetected); |
| 233 | return; |
| 234 | } |
| 235 | /* |
| 236 | * Hello: |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 237 | * - send HelloAck packet to acknowledge the received Hello packet |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 238 | * - use received Hello packet to prepare own Commit packet. We need to |
| 239 | * do it at this point because we need the hash value computed from |
| 240 | * peer's Hello packet. Follwing states my use the prepared Commit. |
| 241 | * - switch to new state AckSent which sends own Hello packet until |
| 242 | * peer acknowledges this |
| 243 | * - Don't clear sentPacket, points to Hello |
| 244 | */ |
| 245 | if (first == 'h' && last ==' ') { |
| 246 | cancelTimer(); |
| 247 | ZrtpPacketHelloAck* helloAck = parent->prepareHelloAck(); |
| 248 | |
| 249 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(helloAck))) { |
| 250 | parent->zrtpNegotiationFailed(Severe, SevereCannotSend); |
| 251 | return; |
| 252 | } |
| 253 | // Use peer's Hello packet to create my commit packet, store it |
| 254 | // for possible later usage in state AckSent |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 255 | ZrtpPacketHello hpkt(pkt); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 256 | commitPkt = parent->prepareCommit(&hpkt, &errorCode); |
| 257 | |
| 258 | nextState(AckSent); |
| 259 | if (commitPkt == NULL) { |
| 260 | sendErrorPacket(errorCode); // switches to Error state |
| 261 | return; |
| 262 | } |
| 263 | if (startTimer(&T1) <= 0) { // restart own Hello timer/counter |
| 264 | timerFailed(SevereNoTimer); // returns to state Initial |
| 265 | } |
| 266 | T1.maxResend = 60; // more retries to extend time, see chap. 6 |
| 267 | } |
| 268 | return; // unknown packet for this state - Just ignore it |
| 269 | } |
| 270 | // Timer event triggered - this is Timer T1 to resend Hello |
| 271 | else if (event->type == Timer) { |
| 272 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 273 | sendFailed(); // returns to state Initial |
| 274 | return; |
| 275 | } |
| 276 | if (nextTimer(&T1) <= 0) { |
| 277 | commitPkt = NULL; |
| 278 | parent->zrtpNotSuppOther(); |
| 279 | nextState(Detect); |
| 280 | } |
| 281 | } |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 282 | // If application call zrtpStart() to restart discovery |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 283 | else if (event->type == ZrtpInitial) { |
| 284 | cancelTimer(); |
| 285 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 286 | sendFailed(); // returns to state Initial |
| 287 | return; |
| 288 | } |
| 289 | if (startTimer(&T1) <= 0) { |
| 290 | timerFailed(SevereNoTimer); // returns to state Initial |
| 291 | } |
| 292 | } |
| 293 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 294 | if (event->type != ZrtpClose) { |
| 295 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 296 | } |
| 297 | sentPacket = NULL; |
| 298 | nextState(Initial); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * AckSent state. |
| 304 | * |
| 305 | * The protocol engine got a Hello packet from peer and answered with a |
| 306 | * HelloAck response. According to the protocol we must also send a |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 307 | * Hello after HelloAck (refer to figure 1 in ZRTP RFC xxxx, message |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 308 | * HelloACK (F2) must be followed by Hello (F3)). We use the timeout in |
| 309 | * this state to send the required Hello (F3). |
| 310 | * |
| 311 | * Our peer must acknowledge the Hello with HelloAck. In earlier versions |
| 312 | * also a Commit was a valid packet thus the code covers this. |
| 313 | * Figure 1 in the RFC shows the HelloAck, chapter 7 states that a Commit |
| 314 | * may be send to acknowledge Hello. There is one constraint when using a Commit to |
| 315 | * acknowledge Hello: refer to chapter 4.1 that requires that both parties |
| 316 | * have completed the Hello/HelloAck discovery handshake. This implies that |
| 317 | * only message F4 may be replaced by a Commit. This constraint guarantees |
| 318 | * that both peers have seen at least one Hello. |
| 319 | * |
| 320 | * When entering this transition function: |
| 321 | * - The instance variabe sentPacket contains own Hello packet |
| 322 | * - The instance variabe commitPkt points to prepared Commit packet |
| 323 | * - Timer T1 is active |
| 324 | * |
| 325 | * Possible events in this state are: |
| 326 | * - timeout for sent Hello packet: causes a resend check and repeat sending |
| 327 | * of Hello packet |
| 328 | * - HelloAck: The peer answered with HelloAck to own HelloAck/Hello. Send |
| 329 | * prepared Commit packet and try Initiator mode. |
| 330 | * - Commit: The peer answered with Commit to HelloAck/Hello, thus switch to |
| 331 | * responder mode. |
| 332 | * - Hello: If the protcol engine receives another Hello it repeats the |
| 333 | * HelloAck/Hello response until Timer T1 exceeds its maximum. This may |
| 334 | * happen if the other peer sends Hello only (maybe due to network problems) |
| 335 | */ |
| 336 | void ZrtpStateClass::evAckSent(void) { |
| 337 | |
| 338 | DEBUGOUT((cout << "Checking for match in AckSent.\n")); |
| 339 | |
| 340 | char *msg, first, last; |
| 341 | uint8_t *pkt; |
| 342 | uint32_t errorCode = 0; |
| 343 | |
| 344 | /* |
| 345 | * First check the general event type, then discrimnate |
| 346 | * the real event. |
| 347 | */ |
| 348 | if (event->type == ZrtpPacket) { |
| 349 | pkt = event->packet; |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 350 | msg = (char *)pkt + 4; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 351 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 352 | first = tolower(*msg); |
| 353 | last = tolower(*(msg+7)); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 354 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 355 | /* |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 356 | * HelloAck: |
| 357 | * The peer answers with HelloAck to own HelloAck/Hello. Send Commit |
| 358 | * and try Initiator mode. The requirement defined in chapter 4.1 to |
| 359 | * have a complete Hello/HelloAck is fulfilled. |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 360 | * - stop Hello timer T1 |
| 361 | * - send own Commit message |
| 362 | * - switch state to CommitSent, start Commit timer, assume Initiator |
| 363 | */ |
| 364 | if (first == 'h' && last =='k') { |
| 365 | cancelTimer(); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 366 | |
| 367 | // remember packet for easy resend in case timer triggers |
| 368 | // Timer trigger received in new state CommitSend |
| 369 | sentPacket = static_cast<ZrtpPacketBase *>(commitPkt); |
| 370 | commitPkt = NULL; // now stored in sentPacket |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 371 | nextState(CommitSent); |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 372 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 373 | sendFailed(); // returns to state Initial |
| 374 | return; |
| 375 | } |
| 376 | if (startTimer(&T2) <= 0) { |
| 377 | timerFailed(SevereNoTimer); // returns to state Initial |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 378 | } |
| 379 | return; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 380 | } |
| 381 | /* |
| 382 | * Hello: |
| 383 | * - peer didn't receive our HelloAck |
| 384 | * - repeat HelloAck/Hello response: |
| 385 | * -- get HelloAck packet, send it |
| 386 | * -- The timeout trigger of T1 sends our Hello packet |
| 387 | * -- stay in state AckSent |
| 388 | * |
| 389 | * Similar to Detect state: just acknowledge the Hello, the next |
| 390 | * timeout sends the following Hello. |
| 391 | */ |
| 392 | |
| 393 | if (first == 'h' && last ==' ') { |
| 394 | ZrtpPacketHelloAck* helloAck = parent->prepareHelloAck(); |
| 395 | |
| 396 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(helloAck))) { |
| 397 | nextState(Detect); |
| 398 | parent->zrtpNegotiationFailed(Severe, SevereCannotSend); |
| 399 | } |
| 400 | return; |
| 401 | } |
| 402 | /* |
| 403 | * Commit: |
| 404 | * The peer answers with Commit to HelloAck/Hello, thus switch to |
| 405 | * responder mode. |
| 406 | * - stop timer T1 |
| 407 | * - prepare and send our DHPart1 |
| 408 | * - switch to state WaitDHPart2 and wait for peer's DHPart2 |
| 409 | * - don't start timer, we are responder |
| 410 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 411 | if (first == 'c') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 412 | cancelTimer(); |
| 413 | ZrtpPacketCommit cpkt(pkt); |
| 414 | |
| 415 | if (!multiStream) { |
| 416 | ZrtpPacketDHPart* dhPart1 = parent->prepareDHPart1(&cpkt, &errorCode); |
| 417 | |
| 418 | // Something went wrong during processing of the Commit packet |
| 419 | if (dhPart1 == NULL) { |
| 420 | if (errorCode != IgnorePacket) { |
| 421 | sendErrorPacket(errorCode); |
| 422 | } |
| 423 | return; |
| 424 | } |
| 425 | commitPkt = NULL; |
| 426 | sentPacket = static_cast<ZrtpPacketBase *>(dhPart1); |
| 427 | nextState(WaitDHPart2); |
| 428 | } |
| 429 | else { |
| 430 | ZrtpPacketConfirm* confirm = parent->prepareConfirm1MultiStream(&cpkt, &errorCode); |
| 431 | |
| 432 | // Something went wrong during processing of the Commit packet |
| 433 | if (confirm == NULL) { |
| 434 | if (errorCode != IgnorePacket) { |
| 435 | sendErrorPacket(errorCode); |
| 436 | } |
| 437 | return; |
| 438 | } |
| 439 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 440 | nextState(WaitConfirm2); |
| 441 | } |
| 442 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 443 | sendFailed(); // returns to state Initial |
| 444 | } |
| 445 | } |
| 446 | } |
| 447 | /* |
| 448 | * Timer: |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 449 | * - resend Hello packet, stay in state, restart timer until repeat |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 450 | * counter triggers |
| 451 | * - if repeat counter triggers switch to state Detect, con't clear |
| 452 | * sentPacket, Detect requires it to point to own Hello message |
| 453 | */ |
| 454 | else if (event->type == Timer) { |
| 455 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 456 | return sendFailed(); // returns to state Initial |
| 457 | } |
| 458 | if (nextTimer(&T1) <= 0) { |
| 459 | parent->zrtpNotSuppOther(); |
| 460 | commitPkt = NULL; |
| 461 | // Stay in state Detect to be prepared get an hello from |
| 462 | // other peer any time later |
| 463 | nextState(Detect); |
| 464 | } |
| 465 | } |
| 466 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 467 | if (event->type != ZrtpClose) { |
| 468 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 469 | } |
| 470 | commitPkt = NULL; |
| 471 | sentPacket = NULL; |
| 472 | nextState(Initial); |
| 473 | } |
| 474 | } |
| 475 | /* |
| 476 | * AckDetected state. |
| 477 | * |
| 478 | * The protocol engine received a HelloAck in state Detect, thus the peer |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 479 | * acknowledged our the Hello. According to ZRT RFC xxxx our peer must send |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 480 | * its Hello until our protocol engine sees it (refer also to comment for |
| 481 | * state AckSent). This protocol sequence gurantees that both peers got at |
| 482 | * least one Hello. |
| 483 | * |
| 484 | * When entering this transition function |
| 485 | * - instance variable sentPacket is NULL, Hello timer stopped |
| 486 | * |
| 487 | * Possible events in this state are: |
| 488 | * Hello: we have to choices |
| 489 | * 1) we can acknowledge the peer's Hello with a HelloAck |
| 490 | * 2) we can acknowledge the peer's Hello with a Commit |
| 491 | * Both choices are implemented and may be enabled by setting a compile |
| 492 | * time #if (see code below). Currently we use choice 1) here because |
| 493 | * it's more aligned to the ZRTP specification |
| 494 | */ |
| 495 | void ZrtpStateClass::evAckDetected(void) { |
| 496 | |
| 497 | DEBUGOUT((cout << "Checking for match in AckDetected.\n")); |
| 498 | |
| 499 | char *msg, first, last; |
| 500 | uint8_t *pkt; |
| 501 | uint32_t errorCode = 0; |
| 502 | |
| 503 | if (event->type == ZrtpPacket) { |
| 504 | pkt = event->packet; |
| 505 | msg = (char *)pkt + 4; |
| 506 | |
| 507 | first = tolower(*msg); |
| 508 | last = tolower(*(msg+7)); |
| 509 | |
| 510 | #if 1 |
| 511 | /* |
| 512 | * Implementation for choice 1) |
| 513 | * Hello: |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 514 | * - Acknowledge peers Hello, sending HelloACK (F4) |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 515 | * - switch to state WaitCommit, wait for peer's Commit |
| 516 | * - we are going to be in the Responder role |
| 517 | */ |
| 518 | |
| 519 | if (first == 'h' && last ==' ') { |
| 520 | // Parse Hello packet and build an own Commit packet even if the |
| 521 | // Commit is not send to the peer. We need to do this to check the |
| 522 | // Hello packet and prepare the shared secret stuff. |
| 523 | ZrtpPacketHello hpkt(pkt); |
| 524 | ZrtpPacketCommit* commit = parent->prepareCommit(&hpkt, &errorCode); |
| 525 | |
| 526 | // Something went wrong during processing of the Hello packet, for |
| 527 | // example wrong version, duplicate ZID. |
| 528 | if (commit == NULL) { |
| 529 | sendErrorPacket(errorCode); |
| 530 | return; |
| 531 | } |
| 532 | ZrtpPacketHelloAck *helloAck = parent->prepareHelloAck(); |
| 533 | nextState(WaitCommit); |
| 534 | |
| 535 | // remember packet for easy resend |
| 536 | sentPacket = static_cast<ZrtpPacketBase *>(helloAck); |
| 537 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(helloAck))) { |
| 538 | sendFailed(); |
| 539 | } |
| 540 | } |
| 541 | #else |
| 542 | /* |
| 543 | * Implementation for choice 2) |
| 544 | * Hello: |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 545 | * - Acknowledge peers Hello by sending Commit (F5) |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 546 | * instead of HelloAck (F4) |
| 547 | * - switch to state CommitSent |
| 548 | * - Initiator role, thus start timer T2 to monitor timeout for Commit |
| 549 | */ |
| 550 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 551 | if (first == 'h') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 552 | // Parse peer's packet data into a Hello packet |
| 553 | ZrtpPacketHello hpkt(pkt); |
| 554 | ZrtpPacketCommit* commit = parent->prepareCommit(&hpkt, &errorCode); |
| 555 | // Something went wrong during processing of the Hello packet |
| 556 | if (commit == NULL) { |
| 557 | sendErrorPacket(errorCode); |
| 558 | return; |
| 559 | } |
| 560 | nextState(CommitSent); |
| 561 | |
| 562 | // remember packet for easy resend in case timer triggers |
| 563 | // Timer trigger received in new state CommitSend |
| 564 | sentPacket = static_cast<ZrtpPacketBase *>(commit); |
| 565 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 566 | sendFailed(); |
| 567 | return; |
| 568 | } |
| 569 | if (startTimer(&T2) <= 0) { |
| 570 | timerFailed(SevereNoTimer); |
| 571 | } |
| 572 | } |
| 573 | #endif |
| 574 | } |
| 575 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 576 | if (event->type != ZrtpClose) { |
| 577 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 578 | } |
| 579 | nextState(Initial); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * WaitCommit state. |
| 585 | * |
| 586 | * This state is only used if we use choice 1) in AckDetected. |
| 587 | * |
| 588 | * When entering this transition function |
| 589 | * - instance variable sentPacket contains a HelloAck packet |
| 590 | * |
| 591 | * Possible events in this state are: |
| 592 | * - Hello: just resend our HelloAck |
| 593 | * - Commit: prepare and send our DHPart1 message to start first |
| 594 | * half of DH key agreement. Switch to state WaitDHPart2, don't |
| 595 | * start any timer, we a Responder. |
| 596 | */ |
| 597 | void ZrtpStateClass::evWaitCommit(void) { |
| 598 | |
| 599 | DEBUGOUT((cout << "Checking for match in WaitCommit.\n")); |
| 600 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 601 | char *msg, first; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 602 | uint8_t *pkt; |
| 603 | uint32_t errorCode = 0; |
| 604 | |
| 605 | if (event->type == ZrtpPacket) { |
| 606 | pkt = event->packet; |
| 607 | msg = (char *)pkt + 4; |
| 608 | |
| 609 | first = tolower(*msg); |
| 610 | /* |
| 611 | * Hello: |
| 612 | * - resend HelloAck |
| 613 | * - stay in WaitCommit |
| 614 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 615 | if (first == 'h') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 616 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 617 | sendFailed(); // returns to state Initial |
| 618 | } |
| 619 | return; |
| 620 | } |
| 621 | /* |
| 622 | * Commit: |
| 623 | * - prepare DH1Part packet or Confirm1 if multi stream mode |
| 624 | * - send it to peer |
| 625 | * - switch state to WaitDHPart2 or WaitConfirm2 if multi stream mode |
| 626 | * - don't start timer, we are responder |
| 627 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 628 | if (first == 'c') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 629 | ZrtpPacketCommit cpkt(pkt); |
| 630 | |
| 631 | if (!multiStream) { |
| 632 | ZrtpPacketDHPart* dhPart1 = parent->prepareDHPart1(&cpkt, &errorCode); |
| 633 | |
| 634 | // Something went wrong during processing of the Commit packet |
| 635 | if (dhPart1 == NULL) { |
| 636 | if (errorCode != IgnorePacket) { |
| 637 | sendErrorPacket(errorCode); |
| 638 | } |
| 639 | return; |
| 640 | } |
| 641 | sentPacket = static_cast<ZrtpPacketBase *>(dhPart1); |
| 642 | nextState(WaitDHPart2); |
| 643 | } |
| 644 | else { |
| 645 | ZrtpPacketConfirm* confirm = parent->prepareConfirm1MultiStream(&cpkt, &errorCode); |
| 646 | |
| 647 | // Something went wrong during processing of the Commit packet |
| 648 | if (confirm == NULL) { |
| 649 | if (errorCode != IgnorePacket) { |
| 650 | sendErrorPacket(errorCode); |
| 651 | } |
| 652 | return; |
| 653 | } |
| 654 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 655 | nextState(WaitConfirm2); |
| 656 | } |
| 657 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 658 | sendFailed(); // returns to state Initial |
| 659 | } |
| 660 | } |
| 661 | } |
| 662 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 663 | if (event->type != ZrtpClose) { |
| 664 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 665 | } |
| 666 | sentPacket = NULL; |
| 667 | nextState(Initial); |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * CommitSent state. |
| 673 | * |
| 674 | * This state either handles a DH1Part1 message to start the first |
| 675 | * half of DH key agreement or it handles a Commit clash. If handling a |
| 676 | * Commit clash it may happen that we change our role from Initiator to |
| 677 | * Responder. |
| 678 | * |
| 679 | * When entering this transition function |
| 680 | * - assume Initiator mode, may change if we reveice a Commit here |
| 681 | * - sentPacket contains Commit packet |
| 682 | * - Commit timer (T2) active |
| 683 | * |
| 684 | * Possible events in this state are: |
| 685 | * - timeout for sent Commit packet: causes a resend check and repeat sending |
| 686 | * of Commit packet |
| 687 | * - Commit: This is a Commit clash. Break the tie accroding to chapter 5.2 |
| 688 | * - DHPart1: start first half of DH key agreement. Perpare and send own DHPart2 |
| 689 | * and switch to state WaitConfirm1. |
| 690 | */ |
| 691 | |
| 692 | void ZrtpStateClass::evCommitSent(void) { |
| 693 | |
| 694 | DEBUGOUT((cout << "Checking for match in CommitSend.\n")); |
| 695 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 696 | char *msg, first, last; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 697 | uint8_t *pkt; |
| 698 | uint32_t errorCode = 0; |
| 699 | |
| 700 | if (event->type == ZrtpPacket) { |
| 701 | pkt = event->packet; |
| 702 | msg = (char *)pkt + 4; |
| 703 | |
| 704 | first = tolower(*msg); |
| 705 | last = tolower(*(msg+7)); |
| 706 | |
| 707 | /* |
| 708 | * HelloAck or Hello: |
| 709 | * - delayed "HelloAck" or "Hello", maybe due to network latency, just |
| 710 | * ignore it |
| 711 | * - no switch in state, leave timer as it is |
| 712 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 713 | if (first == 'h' && (last =='k' || last == ' ')) { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 714 | return; |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Commit: |
| 719 | * We have a "Commit" clash. Resolve it. |
| 720 | * |
| 721 | * - switch off resending Commit |
| 722 | * - compare my hvi with peer's hvi |
| 723 | * - if my hvi is greater |
| 724 | * - we are Initiator, stay in state, wait for peer's DHPart1 packet |
| 725 | * - else |
| 726 | * - we are Responder, stop timer |
| 727 | * - prepare and send DH1Packt, |
| 728 | * - switch to state WaitDHPart2, implies Responder path |
| 729 | */ |
| 730 | if (first == 'c' && last == ' ') { |
| 731 | ZrtpPacketCommit zpCo(pkt); |
| 732 | |
| 733 | if (!parent->verifyH2(&zpCo)) { |
| 734 | return; |
| 735 | } |
| 736 | cancelTimer(); // this cancels the Commit timer T2 |
| 737 | |
| 738 | // if our hvi is less than peer's hvi: switch to Responder mode and |
| 739 | // send DHPart1 or Confirm1 packet. Peer (as Initiator) will retrigger if |
| 740 | // necessary |
| 741 | // |
| 742 | if (parent->compareCommit(&zpCo) < 0) { |
| 743 | if (!multiStream) { |
| 744 | ZrtpPacketDHPart* dhPart1 = parent->prepareDHPart1(&zpCo, &errorCode); |
| 745 | |
| 746 | // Something went wrong during processing of the Commit packet |
| 747 | if (dhPart1 == NULL) { |
| 748 | if (errorCode != IgnorePacket) { |
| 749 | sendErrorPacket(errorCode); |
| 750 | } |
| 751 | return; |
| 752 | } |
| 753 | nextState(WaitDHPart2); |
| 754 | sentPacket = static_cast<ZrtpPacketBase *>(dhPart1); |
| 755 | } |
| 756 | else { |
| 757 | ZrtpPacketConfirm* confirm = parent->prepareConfirm1MultiStream(&zpCo, &errorCode); |
| 758 | |
| 759 | // Something went wrong during processing of the Commit packet |
| 760 | if (confirm == NULL) { |
| 761 | if (errorCode != IgnorePacket) { |
| 762 | sendErrorPacket(errorCode); |
| 763 | } |
| 764 | return; |
| 765 | } |
| 766 | nextState(WaitConfirm2); |
| 767 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 768 | } |
| 769 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 770 | sendFailed(); // returns to state Initial |
| 771 | } |
| 772 | } |
| 773 | // Stay in state, we are Initiator, wait for DHPart1 of Confirm1 packet from peer. |
| 774 | // Resend Commit after timeout until we get a DHPart1 or Confirm1 |
| 775 | else { |
| 776 | if (startTimer(&T2) <= 0) { // restart the Commit timer, gives peer more time to react |
| 777 | timerFailed(SevereNoTimer); // returns to state Initial |
| 778 | } |
| 779 | } |
| 780 | return; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * DHPart1: |
| 785 | * - switch off resending Commit |
| 786 | * - Prepare and send DHPart2 |
| 787 | * - switch to WaitConfirm1 |
| 788 | * - start timer to resend DHPart2 if necessary, we are Initiator |
| 789 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 790 | if (first == 'd') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 791 | cancelTimer(); |
| 792 | sentPacket = NULL; |
| 793 | ZrtpPacketDHPart dpkt(pkt); |
| 794 | ZrtpPacketDHPart* dhPart2 = parent->prepareDHPart2(&dpkt, &errorCode); |
| 795 | |
| 796 | // Something went wrong during processing of the DHPart1 packet |
| 797 | if (dhPart2 == NULL) { |
| 798 | if (errorCode != IgnorePacket) { |
| 799 | sendErrorPacket(errorCode); |
| 800 | } |
| 801 | else { |
| 802 | if (startTimer(&T2) <= 0) { |
| 803 | timerFailed(SevereNoTimer); // switches to state Initial |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | return; |
| 808 | } |
| 809 | sentPacket = static_cast<ZrtpPacketBase *>(dhPart2); |
| 810 | nextState(WaitConfirm1); |
| 811 | |
| 812 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 813 | sendFailed(); // returns to state Initial |
| 814 | return; |
| 815 | } |
| 816 | if (startTimer(&T2) <= 0) { |
| 817 | timerFailed(SevereNoTimer); // switches to state Initial |
| 818 | } |
| 819 | return; |
| 820 | } |
| 821 | |
| 822 | if (multiStream && (first == 'c' && last == '1')) { |
| 823 | cancelTimer(); |
| 824 | ZrtpPacketConfirm cpkt(pkt); |
| 825 | |
| 826 | ZrtpPacketConfirm* confirm = parent->prepareConfirm2MultiStream(&cpkt, &errorCode); |
| 827 | |
| 828 | // Something went wrong during processing of the Confirm1 packet |
| 829 | if (confirm == NULL) { |
| 830 | sendErrorPacket(errorCode); |
| 831 | return; |
| 832 | } |
| 833 | nextState(WaitConfAck); |
| 834 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 835 | |
| 836 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 837 | sendFailed(); // returns to state Initial |
| 838 | return; |
| 839 | } |
| 840 | if (startTimer(&T2) <= 0) { |
| 841 | timerFailed(SevereNoTimer); // returns to state Initial |
| 842 | return; |
| 843 | } |
| 844 | // according to chap 5.6: after sending Confirm2 the Initiator must |
| 845 | // be ready to receive SRTP data. SRTP sender will be enabled in WaitConfAck |
| 846 | // state. |
| 847 | if (!parent->srtpSecretsReady(ForReceiver)) { |
| 848 | parent->sendInfo(Severe, CriticalSWError); |
| 849 | sendErrorPacket(CriticalSWError); |
| 850 | return; |
| 851 | } |
| 852 | } |
| 853 | } |
| 854 | // Timer event triggered, resend the Commit packet |
| 855 | else if (event->type == Timer) { |
| 856 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 857 | sendFailed(); // returns to state Initial |
| 858 | return; |
| 859 | } |
| 860 | if (nextTimer(&T2) <= 0) { |
| 861 | timerFailed(SevereTooMuchRetries); // returns to state Initial |
| 862 | } |
| 863 | } |
| 864 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 865 | if (event->type != ZrtpClose) { |
| 866 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 867 | } |
| 868 | sentPacket = NULL; |
| 869 | nextState(Initial); |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | /* |
| 874 | * WaitDHPart2 state. |
| 875 | * |
| 876 | * This state handles the second part of SH key agreement. Only the Resonder |
| 877 | * can enter this state. |
| 878 | * |
| 879 | * When entering this transition function |
| 880 | * - sentPacket contains DHPart1 packet, no timer active |
| 881 | * |
| 882 | * Possible events in this state are: |
| 883 | * - Commit: Our peer didn't receive out DHPart1 thus the peer sends Commit again. |
| 884 | * Just repeat our DHPart1. |
| 885 | * - DHPart2: start second half of DH key agreement. Perpare and send own Confirm1 |
| 886 | * and switch to state WaitConfirm2. |
| 887 | */ |
| 888 | void ZrtpStateClass::evWaitDHPart2(void) { |
| 889 | |
| 890 | DEBUGOUT((cout << "Checking for match in DHPart2.\n")); |
| 891 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 892 | char *msg, first; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 893 | uint8_t *pkt; |
| 894 | uint32_t errorCode = 0; |
| 895 | |
| 896 | if (event->type == ZrtpPacket) { |
| 897 | pkt = event->packet; |
| 898 | msg = (char *)pkt + 4; |
| 899 | |
| 900 | first = tolower(*msg); |
| 901 | /* |
| 902 | * Commit: |
| 903 | * - resend DHPart1 |
| 904 | * - stay in state |
| 905 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 906 | if (first == 'c') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 907 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 908 | return sendFailed(); // returns to state Initial |
| 909 | } |
| 910 | return; |
| 911 | } |
| 912 | /* |
| 913 | * DHPart2: |
| 914 | * - prepare Confirm1 packet |
| 915 | * - switch to WaitConfirm2 |
| 916 | * - No timer, we are responder |
| 917 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 918 | if (first == 'd') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 919 | ZrtpPacketDHPart dpkt(pkt); |
| 920 | ZrtpPacketConfirm* confirm = parent->prepareConfirm1(&dpkt, &errorCode); |
| 921 | |
| 922 | if (confirm == NULL) { |
| 923 | if (errorCode != IgnorePacket) { |
| 924 | sendErrorPacket(errorCode); |
| 925 | } |
| 926 | return; |
| 927 | } |
| 928 | nextState(WaitConfirm2); |
| 929 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 930 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 931 | sendFailed(); // returns to state Initial |
| 932 | } |
| 933 | } |
| 934 | } |
| 935 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 936 | if (event->type != ZrtpClose) { |
| 937 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 938 | } |
| 939 | sentPacket = NULL; |
| 940 | nextState(Initial); |
| 941 | } |
| 942 | } |
| 943 | |
| 944 | /* |
| 945 | * WaitConirm1 state. |
| 946 | * |
| 947 | * This state handles a received Confirm1 message and only the Initiator |
| 948 | * can enter this state. |
| 949 | * |
| 950 | * When entering this transition function in DH mode: |
| 951 | * - Initiator mode |
| 952 | * - sentPacket contains DHPart2 packet, DHPart2 timer active |
| 953 | * |
| 954 | * When entering this transition function in Multi stream mode via AckSent: |
| 955 | * - Initiator mode |
| 956 | * - sentPacket contains my Commit packet, Commit timer active |
| 957 | * |
| 958 | * Possible events in this state are: |
| 959 | * - timeout for sent DHPart2 packet: causes a resend check and repeat sending |
| 960 | * of DHPart2 packet. |
| 961 | * - Confirm1: Check Confirm1 message. If it is ok then prepare and send own |
| 962 | * Confirm2 packet and switch to state WaitConfAck. |
| 963 | */ |
| 964 | void ZrtpStateClass::evWaitConfirm1(void) { |
| 965 | |
| 966 | DEBUGOUT((cout << "Checking for match in WaitConfirm1.\n")); |
| 967 | |
| 968 | char *msg, first, last; |
| 969 | uint8_t *pkt; |
| 970 | uint32_t errorCode = 0; |
| 971 | |
| 972 | if (event->type == ZrtpPacket) { |
| 973 | pkt = event->packet; |
| 974 | msg = (char *)pkt + 4; |
| 975 | |
| 976 | first = tolower(*msg); |
| 977 | last = tolower(*(msg+7)); |
| 978 | |
| 979 | /* |
| 980 | * Confirm1: |
| 981 | * - Switch off resending DHPart2 |
| 982 | * - prepare a Confirm2 packet |
| 983 | * - switch to state WaitConfAck |
| 984 | * - set timer to monitor Confirm2 packet, we are initiator |
| 985 | */ |
| 986 | if (first == 'c' && last == '1') { |
| 987 | cancelTimer(); |
| 988 | ZrtpPacketConfirm cpkt(pkt); |
| 989 | |
| 990 | ZrtpPacketConfirm* confirm = parent->prepareConfirm2(&cpkt, &errorCode); |
| 991 | |
| 992 | // Something went wrong during processing of the Confirm1 packet |
| 993 | if (confirm == NULL) { |
| 994 | sendErrorPacket(errorCode); |
| 995 | return; |
| 996 | } |
| 997 | nextState(WaitConfAck); |
| 998 | sentPacket = static_cast<ZrtpPacketBase *>(confirm); |
| 999 | |
| 1000 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1001 | sendFailed(); // returns to state Initial |
| 1002 | return; |
| 1003 | } |
| 1004 | if (startTimer(&T2) <= 0) { |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1005 | timerFailed(SevereNoTimer); // returns to state Initial TODO check for return following this line |
| 1006 | } |
| 1007 | // according to chap 5.8: after sending Confirm2 the Initiator must |
| 1008 | // be ready to receive SRTP data. SRTP sender will be enabled in WaitConfAck |
| 1009 | // state. |
| 1010 | if (!parent->srtpSecretsReady(ForReceiver)) { |
| 1011 | parent->sendInfo(Severe, CriticalSWError); |
| 1012 | sendErrorPacket(CriticalSWError); |
| 1013 | return; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1014 | } |
| 1015 | } |
| 1016 | } |
| 1017 | else if (event->type == Timer) { |
| 1018 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1019 | sendFailed(); // returns to state Initial |
| 1020 | return; |
| 1021 | } |
| 1022 | if (nextTimer(&T2) <= 0) { |
| 1023 | timerFailed(SevereTooMuchRetries); // returns to state Initial |
| 1024 | } |
| 1025 | } |
| 1026 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 1027 | if (event->type != ZrtpClose) { |
| 1028 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1029 | } |
| 1030 | sentPacket = NULL; |
| 1031 | nextState(Initial); |
| 1032 | } |
| 1033 | } |
| 1034 | |
| 1035 | /* |
| 1036 | * WaitConfirm2 state. |
| 1037 | * |
| 1038 | * Handles the Confirm2 message that closes the key agreement handshake. Only |
| 1039 | * the Responder can enter this state. If the Confirm2 message is ok send a |
| 1040 | * Conf2Ack to our peer. Switch to secure mode after sending Conf2Ack, our |
| 1041 | * peer switches to secure mode after receiving Conf2Ack. |
| 1042 | * |
| 1043 | * TODO - revise documentation comments |
| 1044 | * |
| 1045 | * When entering this transition function |
| 1046 | * - Responder mode |
| 1047 | * - sentPacket contains Confirm1 packet, no timer active |
| 1048 | * |
| 1049 | * Possible events in this state are: |
| 1050 | * - DHPart2: Our peer didn't receive our Confirm1 thus sends DHPart2 again. |
| 1051 | * Just repeat our Confirm1. |
| 1052 | * - Confirm2: close DH key agreement. Perpare and send own Conf2Ack |
| 1053 | * and switch to state SecureState. |
| 1054 | */ |
| 1055 | void ZrtpStateClass::evWaitConfirm2(void) { |
| 1056 | |
| 1057 | DEBUGOUT((cout << "Checking for match in WaitConfirm2.\n")); |
| 1058 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1059 | char *msg, first, last; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1060 | uint8_t *pkt; |
| 1061 | uint32_t errorCode = 0; |
| 1062 | |
| 1063 | if (event->type == ZrtpPacket) { |
| 1064 | pkt = event->packet; |
| 1065 | msg = (char *)pkt + 4; |
| 1066 | |
| 1067 | first = tolower(*msg); |
| 1068 | last = tolower(*(msg+7)); |
| 1069 | |
| 1070 | /* |
| 1071 | * DHPart2 or Commit in multi stream mode: |
| 1072 | * - resend Confirm1 packet |
| 1073 | * - stay in state |
| 1074 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1075 | if (first == 'd' || (multiStream && (first == 'c' && last == ' '))) { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1076 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1077 | sendFailed(); // returns to state Initial |
| 1078 | } |
| 1079 | return; |
| 1080 | } |
| 1081 | /* |
| 1082 | * Confirm2: |
| 1083 | * - prepare ConfAck |
| 1084 | * - switch on security (SRTP) |
| 1085 | * - switch to SecureState |
| 1086 | */ |
| 1087 | if (first == 'c' && last == '2') { |
| 1088 | ZrtpPacketConfirm cpkt(pkt); |
| 1089 | ZrtpPacketConf2Ack* confack = parent->prepareConf2Ack(&cpkt, &errorCode); |
| 1090 | |
| 1091 | // Something went wrong during processing of the confirm2 packet |
| 1092 | if (confack == NULL) { |
| 1093 | sendErrorPacket(errorCode); |
| 1094 | return; |
| 1095 | } |
| 1096 | sentPacket = static_cast<ZrtpPacketBase *>(confack); |
| 1097 | |
| 1098 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1099 | sendFailed(); // returns to state Initial |
| 1100 | return; |
| 1101 | } |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1102 | if (!parent->srtpSecretsReady(ForSender) || |
| 1103 | !parent->srtpSecretsReady(ForReceiver)) { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1104 | parent->sendInfo(Severe, CriticalSWError); |
| 1105 | sendErrorPacket(CriticalSWError); |
| 1106 | return; |
| 1107 | } |
| 1108 | nextState(SecureState); |
| 1109 | parent->sendInfo(Info, InfoSecureStateOn); |
| 1110 | } |
| 1111 | } |
| 1112 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 1113 | if (event->type != ZrtpClose) { |
| 1114 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1115 | } |
| 1116 | sentPacket = NULL; |
| 1117 | nextState(Initial); |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /* |
| 1122 | * WaitConf2Ack state. |
| 1123 | * |
| 1124 | * This state handles the Conf2Ack message that acknowledges the successfull |
| 1125 | * processing of Confirm2. Only the Initiator can enter this state. Switch on |
| 1126 | * secure mode and switch to state SecureState. |
| 1127 | * |
| 1128 | * When entering this transition function |
| 1129 | * - Initiator mode |
| 1130 | * - sentPacket contains Confirm2 packet, Confirm2 timer active |
| 1131 | * - receiver security switched on |
| 1132 | * |
| 1133 | * Possible events in this state are: |
| 1134 | * - timeout for sent Confirm2 packet: causes a resend check and repeat sending |
| 1135 | * of Confirm2 packet |
| 1136 | * - Conf2Ack: Key agreement was successfull, switch to secure mode. |
| 1137 | */ |
| 1138 | void ZrtpStateClass::evWaitConfAck(void) { |
| 1139 | |
| 1140 | DEBUGOUT((cout << "Checking for match in WaitConfAck.\n")); |
| 1141 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1142 | char *msg, first; |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1143 | uint8_t *pkt; |
| 1144 | |
| 1145 | if (event->type == ZrtpPacket) { |
| 1146 | pkt = event->packet; |
| 1147 | msg = (char *)pkt + 4; |
| 1148 | |
| 1149 | first = tolower(*msg); |
| 1150 | /* |
| 1151 | * ConfAck: |
| 1152 | * - Switch off resending Confirm2 |
| 1153 | * - switch to SecureState |
| 1154 | */ |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1155 | if (first == 'c') { |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1156 | cancelTimer(); |
| 1157 | sentPacket = NULL; |
| 1158 | // Receiver was already enabled after sending Confirm2 packet |
| 1159 | // see previous states. |
| 1160 | if (!parent->srtpSecretsReady(ForSender)) { |
| 1161 | parent->sendInfo(Severe, CriticalSWError); |
| 1162 | sendErrorPacket(CriticalSWError); |
| 1163 | return; |
| 1164 | } |
| 1165 | nextState(SecureState); |
| 1166 | // TODO: call parent to clear signature data at initiator |
| 1167 | parent->sendInfo(Info, InfoSecureStateOn); |
| 1168 | } |
| 1169 | } |
| 1170 | else if (event->type == Timer) { |
| 1171 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1172 | sendFailed(); // returns to state Initial |
| 1173 | parent->srtpSecretsOff(ForReceiver); |
| 1174 | return; |
| 1175 | } |
| 1176 | if (nextTimer(&T2) <= 0) { |
| 1177 | timerFailed(SevereTooMuchRetries); // returns to state Initial |
| 1178 | parent->srtpSecretsOff(ForReceiver); |
| 1179 | } |
| 1180 | } |
| 1181 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 1182 | if (event->type != ZrtpClose) { |
| 1183 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1184 | } |
| 1185 | sentPacket = NULL; |
| 1186 | nextState(Initial); |
| 1187 | parent->srtpSecretsOff(ForReceiver); |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | /* |
| 1192 | * When entering this transition function |
| 1193 | * - sentPacket contains GoClear packet, GoClear timer active |
| 1194 | */ |
| 1195 | |
| 1196 | void ZrtpStateClass::evWaitClearAck(void) { |
| 1197 | DEBUGOUT((cout << "Checking for match in ClearAck.\n")); |
| 1198 | |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1199 | char *msg, first, last; |
| 1200 | uint8_t *pkt; |
| 1201 | |
| 1202 | if (event->type == ZrtpPacket) { |
| 1203 | pkt = event->packet; |
| 1204 | msg = (char *)pkt + 4; |
| 1205 | |
| 1206 | first = tolower(*msg); |
| 1207 | last = tolower(*(msg+7)); |
| 1208 | |
| 1209 | /* |
| 1210 | * ClearAck: |
| 1211 | * - stop resending GoClear, |
| 1212 | * - switch to state AckDetected, wait for peer's Hello |
| 1213 | */ |
| 1214 | if (first == 'c' && last =='k') { |
| 1215 | cancelTimer(); |
| 1216 | sentPacket = NULL; |
| 1217 | nextState(Initial); |
| 1218 | } |
| 1219 | } |
| 1220 | // Timer event triggered - this is Timer T2 to resend GoClear w/o HMAC |
| 1221 | else if (event->type == Timer) { |
| 1222 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1223 | sendFailed(); // returns to state Initial |
| 1224 | return; |
| 1225 | } |
| 1226 | if (nextTimer(&T2) <= 0) { |
| 1227 | timerFailed(SevereTooMuchRetries); // returns to state Initial |
| 1228 | } |
| 1229 | } |
| 1230 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 1231 | if (event->type != ZrtpClose) { |
| 1232 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1233 | } |
| 1234 | sentPacket = NULL; |
| 1235 | nextState(Initial); |
| 1236 | } |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1237 | } |
| 1238 | |
| 1239 | |
| 1240 | /* |
| 1241 | * WaitErrorAck state. |
| 1242 | * |
| 1243 | * This state belongs to the "error handling state overlay" and handle |
| 1244 | * ErrorAck message. Most of the ZRTP states can send Error message for |
| 1245 | * example if they detect wrong packets. After sending an Error message |
| 1246 | * the protocol engine switches to WaitErrorAck state. Receiving an |
| 1247 | * ErrorAck message completes the ZRTP error handling. |
| 1248 | * |
| 1249 | * When entering this transition function |
| 1250 | * - sentPacket contains Error packet, Error timer active |
| 1251 | * |
| 1252 | * Possible events in this state are: |
| 1253 | * - timeout for sent Error packet: causes a resend check and repeat sending |
| 1254 | * of Error packet |
| 1255 | * - ErrorAck: Stop timer and switch to state Initial. |
| 1256 | */ |
| 1257 | |
| 1258 | void ZrtpStateClass::evWaitErrorAck(void) { |
| 1259 | DEBUGOUT((cout << "Checking for match in ErrorAck.\n")); |
| 1260 | |
| 1261 | char *msg, first, last; |
| 1262 | uint8_t *pkt; |
| 1263 | |
| 1264 | if (event->type == ZrtpPacket) { |
| 1265 | pkt = event->packet; |
| 1266 | msg = (char *)pkt + 4; |
| 1267 | |
| 1268 | first = tolower(*msg); |
| 1269 | last = tolower(*(msg+7)); |
| 1270 | |
| 1271 | /* |
| 1272 | * Errorck: |
| 1273 | * - stop resending Error, |
| 1274 | * - switch to state Initial |
| 1275 | */ |
| 1276 | if (first == 'e' && last =='k') { |
| 1277 | cancelTimer(); |
| 1278 | sentPacket = NULL; |
| 1279 | nextState(Initial); |
| 1280 | } |
| 1281 | } |
| 1282 | // Timer event triggered - this is Timer T2 to resend Error. |
| 1283 | else if (event->type == Timer) { |
| 1284 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1285 | sendFailed(); // returns to state Initial |
| 1286 | return; |
| 1287 | } |
| 1288 | if (nextTimer(&T2) <= 0) { |
| 1289 | timerFailed(SevereTooMuchRetries); // returns to state Initial |
| 1290 | } |
| 1291 | } |
| 1292 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
| 1293 | if (event->type != ZrtpClose) { |
| 1294 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1295 | } |
| 1296 | sentPacket = NULL; |
| 1297 | nextState(Initial); |
| 1298 | } |
| 1299 | } |
| 1300 | |
| 1301 | void ZrtpStateClass::evSecureState(void) { |
| 1302 | |
| 1303 | DEBUGOUT((cout << "Checking for match in SecureState.\n")); |
| 1304 | |
| 1305 | char *msg, first, last; |
| 1306 | uint8_t *pkt; |
| 1307 | |
| 1308 | /* |
| 1309 | * Handle a possible substate. If substate handling was ok just return. |
| 1310 | */ |
| 1311 | if (secSubstate == WaitSasRelayAck) { |
| 1312 | if (subEvWaitRelayAck()) |
| 1313 | return; |
| 1314 | } |
| 1315 | |
| 1316 | if (event->type == ZrtpPacket) { |
| 1317 | pkt = event->packet; |
| 1318 | msg = (char *)pkt + 4; |
| 1319 | |
| 1320 | first = tolower(*msg); |
| 1321 | last = tolower(*(msg+7)); |
| 1322 | |
| 1323 | /* |
| 1324 | * Confirm2: |
| 1325 | * - resend Conf2Ack packet |
| 1326 | * - stay in state |
| 1327 | */ |
| 1328 | if (first == 'c' && last == '2') { |
| 1329 | if (sentPacket != NULL && !parent->sendPacketZRTP(sentPacket)) { |
| 1330 | sentPacket = NULL; |
| 1331 | nextState(Initial); |
| 1332 | parent->srtpSecretsOff(ForSender); |
| 1333 | parent->srtpSecretsOff(ForReceiver); |
| 1334 | parent->zrtpNegotiationFailed(Severe, SevereCannotSend); |
| 1335 | } |
| 1336 | return; |
| 1337 | } |
| 1338 | /* |
| 1339 | * GoClear received, handle it. TODO fix go clear handling |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1340 | */ |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1341 | if (first == 'g' && last == 'r') { |
| 1342 | ZrtpPacketGoClear gpkt(pkt); |
| 1343 | ZrtpPacketClearAck* clearAck = parent->prepareClearAck(&gpkt); |
| 1344 | |
| 1345 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(clearAck))) { |
| 1346 | return; |
| 1347 | } |
| 1348 | // TODO Timeout to resend clear ack until user user confirmation |
| 1349 | } |
| 1350 | } |
Alexandre Lision | e24852d | 2014-02-04 13:13:02 -0500 | [diff] [blame] | 1351 | else { // unknown Event type for this state (covers Error and ZrtpClose) |
Alexandre Lision | 51140e1 | 2013-12-02 10:54:09 -0500 | [diff] [blame] | 1352 | sentPacket = NULL; |
| 1353 | parent->srtpSecretsOff(ForSender); |
| 1354 | parent->srtpSecretsOff(ForReceiver); |
| 1355 | nextState(Initial); |
| 1356 | if (event->type != ZrtpClose) { |
| 1357 | parent->zrtpNegotiationFailed(Severe, SevereProtocolError); |
| 1358 | } |
| 1359 | parent->sendInfo(Info, InfoSecureStateOff); |
| 1360 | } |
| 1361 | } |
| 1362 | |
| 1363 | bool ZrtpStateClass::subEvWaitRelayAck() { |
| 1364 | char *msg, first, last; |
| 1365 | uint8_t* pkt; |
| 1366 | |
| 1367 | /* |
| 1368 | * First check the general event type, then discrimnate the real event. |
| 1369 | */ |
| 1370 | if (event->type == ZrtpPacket) { |
| 1371 | pkt = event->packet; |
| 1372 | msg = (char *)pkt + 4; |
| 1373 | |
| 1374 | first = tolower(*msg); |
| 1375 | last = tolower(*(msg+7)); |
| 1376 | |
| 1377 | /* |
| 1378 | * SAS relayAck: |
| 1379 | * - stop resending SASRelay, |
| 1380 | * - switch to secure substate Normal |
| 1381 | */ |
| 1382 | if (first == 'r' && last =='k') { |
| 1383 | cancelTimer(); |
| 1384 | secSubstate = Normal; |
| 1385 | sentPacket = NULL; |
| 1386 | } |
| 1387 | return true; |
| 1388 | } |
| 1389 | // Timer event triggered - this is Timer T2 to resend Error. |
| 1390 | else if (event->type == Timer) { |
| 1391 | if (!parent->sendPacketZRTP(sentPacket)) { |
| 1392 | sendFailed(); // returns to state Initial |
| 1393 | return false; |
| 1394 | } |
| 1395 | if (nextTimer(&T2) <= 0) { |
| 1396 | // returns to state initial |
| 1397 | // timerFailed(ZrtpCodes.SevereCodes.SevereTooMuchRetries); |
| 1398 | return false; |
| 1399 | } |
| 1400 | return true; |
| 1401 | } |
| 1402 | return false; |
| 1403 | } |
| 1404 | |
| 1405 | int32_t ZrtpStateClass::startTimer(zrtpTimer_t *t) { |
| 1406 | |
| 1407 | t->time = t->start; |
| 1408 | t->counter = 0; |
| 1409 | return parent->activateTimer(t->time); |
| 1410 | } |
| 1411 | |
| 1412 | int32_t ZrtpStateClass::nextTimer(zrtpTimer_t *t) { |
| 1413 | |
| 1414 | t->time += t->time; |
| 1415 | t->time = (t->time > t->capping)? t->capping : t->time; |
| 1416 | t->counter++; |
| 1417 | if (t->counter > t->maxResend) { |
| 1418 | return -1; |
| 1419 | } |
| 1420 | return parent->activateTimer(t->time); |
| 1421 | } |
| 1422 | |
| 1423 | void ZrtpStateClass::sendErrorPacket(uint32_t errorCode) { |
| 1424 | cancelTimer(); |
| 1425 | |
| 1426 | ZrtpPacketError* err = parent->prepareError(errorCode); |
| 1427 | parent->zrtpNegotiationFailed(ZrtpError, errorCode); |
| 1428 | |
| 1429 | sentPacket = static_cast<ZrtpPacketBase *>(err); |
| 1430 | nextState(WaitErrorAck); |
| 1431 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(err)) || (startTimer(&T2) <= 0)) { |
| 1432 | sendFailed(); |
| 1433 | } |
| 1434 | } |
| 1435 | |
| 1436 | void ZrtpStateClass::sendSASRelay(ZrtpPacketSASrelay* relay) { |
| 1437 | cancelTimer(); |
| 1438 | sentPacket = static_cast<ZrtpPacketBase *>(relay); |
| 1439 | secSubstate = WaitSasRelayAck; |
| 1440 | if (!parent->sendPacketZRTP(static_cast<ZrtpPacketBase *>(relay)) || (startTimer(&T2) <= 0)) { |
| 1441 | sendFailed(); |
| 1442 | } |
| 1443 | } |
| 1444 | |
| 1445 | void ZrtpStateClass::sendFailed() { |
| 1446 | sentPacket = NULL; |
| 1447 | nextState(Initial); |
| 1448 | parent->zrtpNegotiationFailed(Severe, SevereCannotSend); |
| 1449 | } |
| 1450 | |
| 1451 | void ZrtpStateClass::timerFailed(int32_t subCode) { |
| 1452 | sentPacket = NULL; |
| 1453 | nextState(Initial); |
| 1454 | parent->zrtpNegotiationFailed(Severe, subCode); |
| 1455 | } |
| 1456 | |
| 1457 | void ZrtpStateClass::setMultiStream(bool multi) { |
| 1458 | multiStream = multi; |
| 1459 | } |
| 1460 | |
| 1461 | bool ZrtpStateClass::isMultiStream() { |
| 1462 | return multiStream; |
| 1463 | } |
| 1464 | |
| 1465 | /** EMACS ** |
| 1466 | * Local variables: |
| 1467 | * mode: c++ |
| 1468 | * c-default-style: ellemtel |
| 1469 | * c-basic-offset: 4 |
| 1470 | * End: |
| 1471 | */ |