1 /* 2 * Copyright (C) 2005 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "Parcel" 18 //#define LOG_NDEBUG 0 19 20 #include <binder/Parcel.h> 21 22 #include <binder/IPCThreadState.h> 23 #include <binder/Binder.h> 24 #include <binder/BpBinder.h> 25 #include <utils/Debug.h> 26 #include <binder/ProcessState.h> 27 #include <utils/Log.h> 28 #include <utils/String8.h> 29 #include <utils/String16.h> 30 #include <utils/TextOutput.h> 31 #include <utils/misc.h> 32 #include <utils/Flattenable.h> 33 34 #include <private/binder/binder_module.h> 35 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <stdint.h> 39 40 #ifndef INT32_MAX 41 #define INT32_MAX ((int32_t)(2147483647)) 42 #endif 43 44 #define LOG_REFS(...) 45 //#define LOG_REFS(...) LOG(LOG_DEBUG, "Parcel", __VA_ARGS__) 46 47 // --------------------------------------------------------------------------- 48 49 #define PAD_SIZE(s) (((s)+3)&~3) 50 51 // Note: must be kept in sync with android/os/StrictMode.java's PENALTY_GATHER 52 #define STRICT_MODE_PENALTY_GATHER 0x100 53 54 // Note: must be kept in sync with android/os/Parcel.java's EX_HAS_REPLY_HEADER 55 #define EX_HAS_REPLY_HEADER -128 56 57 // XXX This can be made public if we want to provide 58 // support for typed data. 59 struct small_flat_data 60 { 61 uint32_t type; 62 uint32_t data; 63 }; 64 65 namespace android { 66 67 void acquire_object(const sp<ProcessState>& proc, 68 const flat_binder_object& obj, const void* who) 69 { 70 switch (obj.type) { 71 case BINDER_TYPE_BINDER: 72 if (obj.binder) { 73 LOG_REFS("Parcel %p acquiring reference on local %p", who, obj.cookie); 74 static_cast<IBinder*>(obj.cookie)->incStrong(who); 75 } 76 return; 77 case BINDER_TYPE_WEAK_BINDER: 78 if (obj.binder) 79 static_cast<RefBase::weakref_type*>(obj.binder)->incWeak(who); 80 return; 81 case BINDER_TYPE_HANDLE: { 82 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 83 if (b != NULL) { 84 LOG_REFS("Parcel %p acquiring reference on remote %p", who, b.get()); 85 b->incStrong(who); 86 } 87 return; 88 } 89 case BINDER_TYPE_WEAK_HANDLE: { 90 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 91 if (b != NULL) b.get_refs()->incWeak(who); 92 return; 93 } 94 case BINDER_TYPE_FD: { 95 // intentionally blank -- nothing to do to acquire this, but we do 96 // recognize it as a legitimate object type. 97 return; 98 } 99 } 100 101 LOGD("Invalid object type 0x%08lx", obj.type); 102 } 103 104 void release_object(const sp<ProcessState>& proc, 105 const flat_binder_object& obj, const void* who) 106 { 107 switch (obj.type) { 108 case BINDER_TYPE_BINDER: 109 if (obj.binder) { 110 LOG_REFS("Parcel %p releasing reference on local %p", who, obj.cookie); 111 static_cast<IBinder*>(obj.cookie)->decStrong(who); 112 } 113 return; 114 case BINDER_TYPE_WEAK_BINDER: 115 if (obj.binder) 116 static_cast<RefBase::weakref_type*>(obj.binder)->decWeak(who); 117 return; 118 case BINDER_TYPE_HANDLE: { 119 const sp<IBinder> b = proc->getStrongProxyForHandle(obj.handle); 120 if (b != NULL) { 121 LOG_REFS("Parcel %p releasing reference on remote %p", who, b.get()); 122 b->decStrong(who); 123 } 124 return; 125 } 126 case BINDER_TYPE_WEAK_HANDLE: { 127 const wp<IBinder> b = proc->getWeakProxyForHandle(obj.handle); 128 if (b != NULL) b.get_refs()->decWeak(who); 129 return; 130 } 131 case BINDER_TYPE_FD: { 132 if (obj.cookie != (void*)0) close(obj.handle); 133 return; 134 } 135 } 136 137 LOGE("Invalid object type 0x%08lx", obj.type); 138 } 139 140 inline static status_t finish_flatten_binder( 141 const sp<IBinder>& binder, const flat_binder_object& flat, Parcel* out) 142 { 143 return out->writeObject(flat, false); 144 } 145 146 status_t flatten_binder(const sp<ProcessState>& proc, 147 const sp<IBinder>& binder, Parcel* out) 148 { 149 flat_binder_object obj; 150 151 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 152 if (binder != NULL) { 153 IBinder *local = binder->localBinder(); 154 if (!local) { 155 BpBinder *proxy = binder->remoteBinder(); 156 if (proxy == NULL) { 157 LOGE("null proxy"); 158 } 159 const int32_t handle = proxy ? proxy->handle() : 0; 160 obj.type = BINDER_TYPE_HANDLE; 161 obj.handle = handle; 162 obj.cookie = NULL; 163 } else { 164 obj.type = BINDER_TYPE_BINDER; 165 obj.binder = local->getWeakRefs(); 166 obj.cookie = local; 167 } 168 } else { 169 obj.type = BINDER_TYPE_BINDER; 170 obj.binder = NULL; 171 obj.cookie = NULL; 172 } 173 174 return finish_flatten_binder(binder, obj, out); 175 } 176 177 status_t flatten_binder(const sp<ProcessState>& proc, 178 const wp<IBinder>& binder, Parcel* out) 179 { 180 flat_binder_object obj; 181 182 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 183 if (binder != NULL) { 184 sp<IBinder> real = binder.promote(); 185 if (real != NULL) { 186 IBinder *local = real->localBinder(); 187 if (!local) { 188 BpBinder *proxy = real->remoteBinder(); 189 if (proxy == NULL) { 190 LOGE("null proxy"); 191 } 192 const int32_t handle = proxy ? proxy->handle() : 0; 193 obj.type = BINDER_TYPE_WEAK_HANDLE; 194 obj.handle = handle; 195 obj.cookie = NULL; 196 } else { 197 obj.type = BINDER_TYPE_WEAK_BINDER; 198 obj.binder = binder.get_refs(); 199 obj.cookie = binder.unsafe_get(); 200 } 201 return finish_flatten_binder(real, obj, out); 202 } 203 204 // XXX How to deal? In order to flatten the given binder, 205 // we need to probe it for information, which requires a primary 206 // reference... but we don't have one. 207 // 208 // The OpenBinder implementation uses a dynamic_cast<> here, 209 // but we can't do that with the different reference counting 210 // implementation we are using. 211 LOGE("Unable to unflatten Binder weak reference!"); 212 obj.type = BINDER_TYPE_BINDER; 213 obj.binder = NULL; 214 obj.cookie = NULL; 215 return finish_flatten_binder(NULL, obj, out); 216 217 } else { 218 obj.type = BINDER_TYPE_BINDER; 219 obj.binder = NULL; 220 obj.cookie = NULL; 221 return finish_flatten_binder(NULL, obj, out); 222 } 223 } 224 225 inline static status_t finish_unflatten_binder( 226 BpBinder* proxy, const flat_binder_object& flat, const Parcel& in) 227 { 228 return NO_ERROR; 229 } 230 231 status_t unflatten_binder(const sp<ProcessState>& proc, 232 const Parcel& in, sp<IBinder>* out) 233 { 234 const flat_binder_object* flat = in.readObject(false); 235 236 if (flat) { 237 switch (flat->type) { 238 case BINDER_TYPE_BINDER: 239 *out = static_cast<IBinder*>(flat->cookie); 240 return finish_unflatten_binder(NULL, *flat, in); 241 case BINDER_TYPE_HANDLE: 242 *out = proc->getStrongProxyForHandle(flat->handle); 243 return finish_unflatten_binder( 244 static_cast<BpBinder*>(out->get()), *flat, in); 245 } 246 } 247 return BAD_TYPE; 248 } 249 250 status_t unflatten_binder(const sp<ProcessState>& proc, 251 const Parcel& in, wp<IBinder>* out) 252 { 253 const flat_binder_object* flat = in.readObject(false); 254 255 if (flat) { 256 switch (flat->type) { 257 case BINDER_TYPE_BINDER: 258 *out = static_cast<IBinder*>(flat->cookie); 259 return finish_unflatten_binder(NULL, *flat, in); 260 case BINDER_TYPE_WEAK_BINDER: 261 if (flat->binder != NULL) { 262 out->set_object_and_refs( 263 static_cast<IBinder*>(flat->cookie), 264 static_cast<RefBase::weakref_type*>(flat->binder)); 265 } else { 266 *out = NULL; 267 } 268 return finish_unflatten_binder(NULL, *flat, in); 269 case BINDER_TYPE_HANDLE: 270 case BINDER_TYPE_WEAK_HANDLE: 271 *out = proc->getWeakProxyForHandle(flat->handle); 272 return finish_unflatten_binder( 273 static_cast<BpBinder*>(out->unsafe_get()), *flat, in); 274 } 275 } 276 return BAD_TYPE; 277 } 278 279 // --------------------------------------------------------------------------- 280 281 Parcel::Parcel() 282 { 283 initState(); 284 } 285 286 Parcel::~Parcel() 287 { 288 freeDataNoInit(); 289 } 290 291 const uint8_t* Parcel::data() const 292 { 293 return mData; 294 } 295 296 size_t Parcel::dataSize() const 297 { 298 return (mDataSize > mDataPos ? mDataSize : mDataPos); 299 } 300 301 size_t Parcel::dataAvail() const 302 { 303 // TODO: decide what to do about the possibility that this can 304 // report an available-data size that exceeds a Java int's max 305 // positive value, causing havoc. Fortunately this will only 306 // happen if someone constructs a Parcel containing more than two 307 // gigabytes of data, which on typical phone hardware is simply 308 // not possible. 309 return dataSize() - dataPosition(); 310 } 311 312 size_t Parcel::dataPosition() const 313 { 314 return mDataPos; 315 } 316 317 size_t Parcel::dataCapacity() const 318 { 319 return mDataCapacity; 320 } 321 322 status_t Parcel::setDataSize(size_t size) 323 { 324 status_t err; 325 err = continueWrite(size); 326 if (err == NO_ERROR) { 327 mDataSize = size; 328 LOGV("setDataSize Setting data size of %p to %d\n", this, mDataSize); 329 } 330 return err; 331 } 332 333 void Parcel::setDataPosition(size_t pos) const 334 { 335 mDataPos = pos; 336 mNextObjectHint = 0; 337 } 338 339 status_t Parcel::setDataCapacity(size_t size) 340 { 341 if (size > mDataSize) return continueWrite(size); 342 return NO_ERROR; 343 } 344 345 status_t Parcel::setData(const uint8_t* buffer, size_t len) 346 { 347 status_t err = restartWrite(len); 348 if (err == NO_ERROR) { 349 memcpy(const_cast<uint8_t*>(data()), buffer, len); 350 mDataSize = len; 351 mFdsKnown = false; 352 } 353 return err; 354 } 355 356 status_t Parcel::appendFrom(Parcel *parcel, size_t offset, size_t len) 357 { 358 const sp<ProcessState> proc(ProcessState::self()); 359 status_t err; 360 uint8_t *data = parcel->mData; 361 size_t *objects = parcel->mObjects; 362 size_t size = parcel->mObjectsSize; 363 int startPos = mDataPos; 364 int firstIndex = -1, lastIndex = -2; 365 366 if (len == 0) { 367 return NO_ERROR; 368 } 369 370 // range checks against the source parcel size 371 if ((offset > parcel->mDataSize) 372 || (len > parcel->mDataSize) 373 || (offset + len > parcel->mDataSize)) { 374 return BAD_VALUE; 375 } 376 377 // Count objects in range 378 for (int i = 0; i < (int) size; i++) { 379 size_t off = objects[i]; 380 if ((off >= offset) && (off < offset + len)) { 381 if (firstIndex == -1) { 382 firstIndex = i; 383 } 384 lastIndex = i; 385 } 386 } 387 int numObjects = lastIndex - firstIndex + 1; 388 389 // grow data 390 err = growData(len); 391 if (err != NO_ERROR) { 392 return err; 393 } 394 395 // append data 396 memcpy(mData + mDataPos, data + offset, len); 397 mDataPos += len; 398 mDataSize += len; 399 400 if (numObjects > 0) { 401 // grow objects 402 if (mObjectsCapacity < mObjectsSize + numObjects) { 403 int newSize = ((mObjectsSize + numObjects)*3)/2; 404 size_t *objects = 405 (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 406 if (objects == (size_t*)0) { 407 return NO_MEMORY; 408 } 409 mObjects = objects; 410 mObjectsCapacity = newSize; 411 } 412 413 // append and acquire objects 414 int idx = mObjectsSize; 415 for (int i = firstIndex; i <= lastIndex; i++) { 416 size_t off = objects[i] - offset + startPos; 417 mObjects[idx++] = off; 418 mObjectsSize++; 419 420 flat_binder_object* flat 421 = reinterpret_cast<flat_binder_object*>(mData + off); 422 acquire_object(proc, *flat, this); 423 424 if (flat->type == BINDER_TYPE_FD) { 425 // If this is a file descriptor, we need to dup it so the 426 // new Parcel now owns its own fd, and can declare that we 427 // officially know we have fds. 428 flat->handle = dup(flat->handle); 429 flat->cookie = (void*)1; 430 mHasFds = mFdsKnown = true; 431 } 432 } 433 } 434 435 return NO_ERROR; 436 } 437 438 bool Parcel::hasFileDescriptors() const 439 { 440 if (!mFdsKnown) { 441 scanForFds(); 442 } 443 return mHasFds; 444 } 445 446 // Write RPC headers. (previously just the interface token) 447 status_t Parcel::writeInterfaceToken(const String16& interface) 448 { 449 writeInt32(IPCThreadState::self()->getStrictModePolicy() | 450 STRICT_MODE_PENALTY_GATHER); 451 // currently the interface identification token is just its name as a string 452 return writeString16(interface); 453 } 454 455 bool Parcel::checkInterface(IBinder* binder) const 456 { 457 return enforceInterface(binder->getInterfaceDescriptor()); 458 } 459 460 bool Parcel::enforceInterface(const String16& interface, 461 IPCThreadState* threadState) const 462 { 463 int32_t strictPolicy = readInt32(); 464 if (threadState == NULL) { 465 threadState = IPCThreadState::self(); 466 } 467 if ((threadState->getLastTransactionBinderFlags() & 468 IBinder::FLAG_ONEWAY) != 0) { 469 // For one-way calls, the callee is running entirely 470 // disconnected from the caller, so disable StrictMode entirely. 471 // Not only does disk/network usage not impact the caller, but 472 // there's no way to commuicate back any violations anyway. 473 threadState->setStrictModePolicy(0); 474 } else { 475 threadState->setStrictModePolicy(strictPolicy); 476 } 477 const String16 str(readString16()); 478 if (str == interface) { 479 return true; 480 } else { 481 LOGW("**** enforceInterface() expected '%s' but read '%s'\n", 482 String8(interface).string(), String8(str).string()); 483 return false; 484 } 485 } 486 487 const size_t* Parcel::objects() const 488 { 489 return mObjects; 490 } 491 492 size_t Parcel::objectsCount() const 493 { 494 return mObjectsSize; 495 } 496 497 status_t Parcel::errorCheck() const 498 { 499 return mError; 500 } 501 502 void Parcel::setError(status_t err) 503 { 504 mError = err; 505 } 506 507 status_t Parcel::finishWrite(size_t len) 508 { 509 //printf("Finish write of %d\n", len); 510 mDataPos += len; 511 LOGV("finishWrite Setting data pos of %p to %d\n", this, mDataPos); 512 if (mDataPos > mDataSize) { 513 mDataSize = mDataPos; 514 LOGV("finishWrite Setting data size of %p to %d\n", this, mDataSize); 515 } 516 //printf("New pos=%d, size=%d\n", mDataPos, mDataSize); 517 return NO_ERROR; 518 } 519 520 status_t Parcel::writeUnpadded(const void* data, size_t len) 521 { 522 size_t end = mDataPos + len; 523 if (end < mDataPos) { 524 // integer overflow 525 return BAD_VALUE; 526 } 527 528 if (end <= mDataCapacity) { 529 restart_write: 530 memcpy(mData+mDataPos, data, len); 531 return finishWrite(len); 532 } 533 534 status_t err = growData(len); 535 if (err == NO_ERROR) goto restart_write; 536 return err; 537 } 538 539 status_t Parcel::write(const void* data, size_t len) 540 { 541 void* const d = writeInplace(len); 542 if (d) { 543 memcpy(d, data, len); 544 return NO_ERROR; 545 } 546 return mError; 547 } 548 549 void* Parcel::writeInplace(size_t len) 550 { 551 const size_t padded = PAD_SIZE(len); 552 553 // sanity check for integer overflow 554 if (mDataPos+padded < mDataPos) { 555 return NULL; 556 } 557 558 if ((mDataPos+padded) <= mDataCapacity) { 559 restart_write: 560 //printf("Writing %ld bytes, padded to %ld\n", len, padded); 561 uint8_t* const data = mData+mDataPos; 562 563 // Need to pad at end? 564 if (padded != len) { 565 #if BYTE_ORDER == BIG_ENDIAN 566 static const uint32_t mask[4] = { 567 0x00000000, 0xffffff00, 0xffff0000, 0xff000000 568 }; 569 #endif 570 #if BYTE_ORDER == LITTLE_ENDIAN 571 static const uint32_t mask[4] = { 572 0x00000000, 0x00ffffff, 0x0000ffff, 0x000000ff 573 }; 574 #endif 575 //printf("Applying pad mask: %p to %p\n", (void*)mask[padded-len], 576 // *reinterpret_cast<void**>(data+padded-4)); 577 *reinterpret_cast<uint32_t*>(data+padded-4) &= mask[padded-len]; 578 } 579 580 finishWrite(padded); 581 return data; 582 } 583 584 status_t err = growData(padded); 585 if (err == NO_ERROR) goto restart_write; 586 return NULL; 587 } 588 589 status_t Parcel::writeInt32(int32_t val) 590 { 591 return writeAligned(val); 592 } 593 594 status_t Parcel::writeInt64(int64_t val) 595 { 596 return writeAligned(val); 597 } 598 599 status_t Parcel::writeFloat(float val) 600 { 601 return writeAligned(val); 602 } 603 604 status_t Parcel::writeDouble(double val) 605 { 606 return writeAligned(val); 607 } 608 609 status_t Parcel::writeIntPtr(intptr_t val) 610 { 611 return writeAligned(val); 612 } 613 614 status_t Parcel::writeCString(const char* str) 615 { 616 return write(str, strlen(str)+1); 617 } 618 619 status_t Parcel::writeString8(const String8& str) 620 { 621 status_t err = writeInt32(str.bytes()); 622 if (err == NO_ERROR) { 623 err = write(str.string(), str.bytes()+1); 624 } 625 return err; 626 } 627 628 status_t Parcel::writeString16(const String16& str) 629 { 630 return writeString16(str.string(), str.size()); 631 } 632 633 status_t Parcel::writeString16(const char16_t* str, size_t len) 634 { 635 if (str == NULL) return writeInt32(-1); 636 637 status_t err = writeInt32(len); 638 if (err == NO_ERROR) { 639 len *= sizeof(char16_t); 640 uint8_t* data = (uint8_t*)writeInplace(len+sizeof(char16_t)); 641 if (data) { 642 memcpy(data, str, len); 643 *reinterpret_cast<char16_t*>(data+len) = 0; 644 return NO_ERROR; 645 } 646 err = mError; 647 } 648 return err; 649 } 650 651 status_t Parcel::writeStrongBinder(const sp<IBinder>& val) 652 { 653 return flatten_binder(ProcessState::self(), val, this); 654 } 655 656 status_t Parcel::writeWeakBinder(const wp<IBinder>& val) 657 { 658 return flatten_binder(ProcessState::self(), val, this); 659 } 660 661 status_t Parcel::writeNativeHandle(const native_handle* handle) 662 { 663 if (!handle || handle->version != sizeof(native_handle)) 664 return BAD_TYPE; 665 666 status_t err; 667 err = writeInt32(handle->numFds); 668 if (err != NO_ERROR) return err; 669 670 err = writeInt32(handle->numInts); 671 if (err != NO_ERROR) return err; 672 673 for (int i=0 ; err==NO_ERROR && i<handle->numFds ; i++) 674 err = writeDupFileDescriptor(handle->data[i]); 675 676 if (err != NO_ERROR) { 677 LOGD("write native handle, write dup fd failed"); 678 return err; 679 } 680 err = write(handle->data + handle->numFds, sizeof(int)*handle->numInts); 681 return err; 682 } 683 684 status_t Parcel::writeFileDescriptor(int fd) 685 { 686 flat_binder_object obj; 687 obj.type = BINDER_TYPE_FD; 688 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 689 obj.handle = fd; 690 obj.cookie = (void*)0; 691 return writeObject(obj, true); 692 } 693 694 status_t Parcel::writeDupFileDescriptor(int fd) 695 { 696 flat_binder_object obj; 697 obj.type = BINDER_TYPE_FD; 698 obj.flags = 0x7f | FLAT_BINDER_FLAG_ACCEPTS_FDS; 699 obj.handle = dup(fd); 700 obj.cookie = (void*)1; 701 return writeObject(obj, true); 702 } 703 704 status_t Parcel::write(const Flattenable& val) 705 { 706 status_t err; 707 708 // size if needed 709 size_t len = val.getFlattenedSize(); 710 size_t fd_count = val.getFdCount(); 711 712 err = this->writeInt32(len); 713 if (err) return err; 714 715 err = this->writeInt32(fd_count); 716 if (err) return err; 717 718 // payload 719 void* buf = this->writeInplace(PAD_SIZE(len)); 720 if (buf == NULL) 721 return BAD_VALUE; 722 723 int* fds = NULL; 724 if (fd_count) { 725 fds = new int[fd_count]; 726 } 727 728 err = val.flatten(buf, len, fds, fd_count); 729 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 730 err = this->writeDupFileDescriptor( fds[i] ); 731 } 732 733 if (fd_count) { 734 delete [] fds; 735 } 736 737 return err; 738 } 739 740 status_t Parcel::writeObject(const flat_binder_object& val, bool nullMetaData) 741 { 742 const bool enoughData = (mDataPos+sizeof(val)) <= mDataCapacity; 743 const bool enoughObjects = mObjectsSize < mObjectsCapacity; 744 if (enoughData && enoughObjects) { 745 restart_write: 746 *reinterpret_cast<flat_binder_object*>(mData+mDataPos) = val; 747 748 // Need to write meta-data? 749 if (nullMetaData || val.binder != NULL) { 750 mObjects[mObjectsSize] = mDataPos; 751 acquire_object(ProcessState::self(), val, this); 752 mObjectsSize++; 753 } 754 755 // remember if it's a file descriptor 756 if (val.type == BINDER_TYPE_FD) { 757 mHasFds = mFdsKnown = true; 758 } 759 760 return finishWrite(sizeof(flat_binder_object)); 761 } 762 763 if (!enoughData) { 764 const status_t err = growData(sizeof(val)); 765 if (err != NO_ERROR) return err; 766 } 767 if (!enoughObjects) { 768 size_t newSize = ((mObjectsSize+2)*3)/2; 769 size_t* objects = (size_t*)realloc(mObjects, newSize*sizeof(size_t)); 770 if (objects == NULL) return NO_MEMORY; 771 mObjects = objects; 772 mObjectsCapacity = newSize; 773 } 774 775 goto restart_write; 776 } 777 778 status_t Parcel::writeNoException() 779 { 780 return writeInt32(0); 781 } 782 783 void Parcel::remove(size_t start, size_t amt) 784 { 785 LOG_ALWAYS_FATAL("Parcel::remove() not yet implemented!"); 786 } 787 788 status_t Parcel::read(void* outData, size_t len) const 789 { 790 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 791 memcpy(outData, mData+mDataPos, len); 792 mDataPos += PAD_SIZE(len); 793 LOGV("read Setting data pos of %p to %d\n", this, mDataPos); 794 return NO_ERROR; 795 } 796 return NOT_ENOUGH_DATA; 797 } 798 799 const void* Parcel::readInplace(size_t len) const 800 { 801 if ((mDataPos+PAD_SIZE(len)) >= mDataPos && (mDataPos+PAD_SIZE(len)) <= mDataSize) { 802 const void* data = mData+mDataPos; 803 mDataPos += PAD_SIZE(len); 804 LOGV("readInplace Setting data pos of %p to %d\n", this, mDataPos); 805 return data; 806 } 807 return NULL; 808 } 809 810 template<class T> 811 status_t Parcel::readAligned(T *pArg) const { 812 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 813 814 if ((mDataPos+sizeof(T)) <= mDataSize) { 815 const void* data = mData+mDataPos; 816 mDataPos += sizeof(T); 817 *pArg = *reinterpret_cast<const T*>(data); 818 return NO_ERROR; 819 } else { 820 return NOT_ENOUGH_DATA; 821 } 822 } 823 824 template<class T> 825 T Parcel::readAligned() const { 826 T result; 827 if (readAligned(&result) != NO_ERROR) { 828 result = 0; 829 } 830 831 return result; 832 } 833 834 template<class T> 835 status_t Parcel::writeAligned(T val) { 836 COMPILE_TIME_ASSERT_FUNCTION_SCOPE(PAD_SIZE(sizeof(T)) == sizeof(T)); 837 838 if ((mDataPos+sizeof(val)) <= mDataCapacity) { 839 restart_write: 840 *reinterpret_cast<T*>(mData+mDataPos) = val; 841 return finishWrite(sizeof(val)); 842 } 843 844 status_t err = growData(sizeof(val)); 845 if (err == NO_ERROR) goto restart_write; 846 return err; 847 } 848 849 status_t Parcel::readInt32(int32_t *pArg) const 850 { 851 return readAligned(pArg); 852 } 853 854 int32_t Parcel::readInt32() const 855 { 856 return readAligned<int32_t>(); 857 } 858 859 860 status_t Parcel::readInt64(int64_t *pArg) const 861 { 862 return readAligned(pArg); 863 } 864 865 866 int64_t Parcel::readInt64() const 867 { 868 return readAligned<int64_t>(); 869 } 870 871 status_t Parcel::readFloat(float *pArg) const 872 { 873 return readAligned(pArg); 874 } 875 876 877 float Parcel::readFloat() const 878 { 879 return readAligned<float>(); 880 } 881 882 status_t Parcel::readDouble(double *pArg) const 883 { 884 return readAligned(pArg); 885 } 886 887 888 double Parcel::readDouble() const 889 { 890 return readAligned<double>(); 891 } 892 893 status_t Parcel::readIntPtr(intptr_t *pArg) const 894 { 895 return readAligned(pArg); 896 } 897 898 899 intptr_t Parcel::readIntPtr() const 900 { 901 return readAligned<intptr_t>(); 902 } 903 904 905 const char* Parcel::readCString() const 906 { 907 const size_t avail = mDataSize-mDataPos; 908 if (avail > 0) { 909 const char* str = reinterpret_cast<const char*>(mData+mDataPos); 910 // is the string's trailing NUL within the parcel's valid bounds? 911 const char* eos = reinterpret_cast<const char*>(memchr(str, 0, avail)); 912 if (eos) { 913 const size_t len = eos - str; 914 mDataPos += PAD_SIZE(len+1); 915 LOGV("readCString Setting data pos of %p to %d\n", this, mDataPos); 916 return str; 917 } 918 } 919 return NULL; 920 } 921 922 String8 Parcel::readString8() const 923 { 924 int32_t size = readInt32(); 925 // watch for potential int overflow adding 1 for trailing NUL 926 if (size > 0 && size < INT32_MAX) { 927 const char* str = (const char*)readInplace(size+1); 928 if (str) return String8(str, size); 929 } 930 return String8(); 931 } 932 933 String16 Parcel::readString16() const 934 { 935 size_t len; 936 const char16_t* str = readString16Inplace(&len); 937 if (str) return String16(str, len); 938 LOGE("Reading a NULL string not supported here."); 939 return String16(); 940 } 941 942 const char16_t* Parcel::readString16Inplace(size_t* outLen) const 943 { 944 int32_t size = readInt32(); 945 // watch for potential int overflow from size+1 946 if (size >= 0 && size < INT32_MAX) { 947 *outLen = size; 948 const char16_t* str = (const char16_t*)readInplace((size+1)*sizeof(char16_t)); 949 if (str != NULL) { 950 return str; 951 } 952 } 953 *outLen = 0; 954 return NULL; 955 } 956 957 sp<IBinder> Parcel::readStrongBinder() const 958 { 959 sp<IBinder> val; 960 unflatten_binder(ProcessState::self(), *this, &val); 961 return val; 962 } 963 964 wp<IBinder> Parcel::readWeakBinder() const 965 { 966 wp<IBinder> val; 967 unflatten_binder(ProcessState::self(), *this, &val); 968 return val; 969 } 970 971 int32_t Parcel::readExceptionCode() const 972 { 973 int32_t exception_code = readAligned<int32_t>(); 974 if (exception_code == EX_HAS_REPLY_HEADER) { 975 int32_t header_size = readAligned<int32_t>(); 976 // Skip over fat responses headers. Not used (or propagated) in 977 // native code 978 setDataPosition(dataPosition() + header_size); 979 // And fat response headers are currently only used when there are no 980 // exceptions, so return no error: 981 return 0; 982 } 983 return exception_code; 984 } 985 986 native_handle* Parcel::readNativeHandle() const 987 { 988 int numFds, numInts; 989 status_t err; 990 err = readInt32(&numFds); 991 if (err != NO_ERROR) return 0; 992 err = readInt32(&numInts); 993 if (err != NO_ERROR) return 0; 994 995 native_handle* h = native_handle_create(numFds, numInts); 996 for (int i=0 ; err==NO_ERROR && i<numFds ; i++) { 997 h->data[i] = dup(readFileDescriptor()); 998 if (h->data[i] < 0) err = BAD_VALUE; 999 } 1000 err = read(h->data + numFds, sizeof(int)*numInts); 1001 if (err != NO_ERROR) { 1002 native_handle_close(h); 1003 native_handle_delete(h); 1004 h = 0; 1005 } 1006 return h; 1007 } 1008 1009 1010 int Parcel::readFileDescriptor() const 1011 { 1012 const flat_binder_object* flat = readObject(true); 1013 if (flat) { 1014 switch (flat->type) { 1015 case BINDER_TYPE_FD: 1016 //LOGI("Returning file descriptor %ld from parcel %p\n", flat->handle, this); 1017 return flat->handle; 1018 } 1019 } 1020 return BAD_TYPE; 1021 } 1022 1023 status_t Parcel::read(Flattenable& val) const 1024 { 1025 // size 1026 const size_t len = this->readInt32(); 1027 const size_t fd_count = this->readInt32(); 1028 1029 // payload 1030 void const* buf = this->readInplace(PAD_SIZE(len)); 1031 if (buf == NULL) 1032 return BAD_VALUE; 1033 1034 int* fds = NULL; 1035 if (fd_count) { 1036 fds = new int[fd_count]; 1037 } 1038 1039 status_t err = NO_ERROR; 1040 for (size_t i=0 ; i<fd_count && err==NO_ERROR ; i++) { 1041 fds[i] = dup(this->readFileDescriptor()); 1042 if (fds[i] < 0) err = BAD_VALUE; 1043 } 1044 1045 if (err == NO_ERROR) { 1046 err = val.unflatten(buf, len, fds, fd_count); 1047 } 1048 1049 if (fd_count) { 1050 delete [] fds; 1051 } 1052 1053 return err; 1054 } 1055 const flat_binder_object* Parcel::readObject(bool nullMetaData) const 1056 { 1057 const size_t DPOS = mDataPos; 1058 if ((DPOS+sizeof(flat_binder_object)) <= mDataSize) { 1059 const flat_binder_object* obj 1060 = reinterpret_cast<const flat_binder_object*>(mData+DPOS); 1061 mDataPos = DPOS + sizeof(flat_binder_object); 1062 if (!nullMetaData && (obj->cookie == NULL && obj->binder == NULL)) { 1063 // When transferring a NULL object, we don't write it into 1064 // the object list, so we don't want to check for it when 1065 // reading. 1066 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1067 return obj; 1068 } 1069 1070 // Ensure that this object is valid... 1071 size_t* const OBJS = mObjects; 1072 const size_t N = mObjectsSize; 1073 size_t opos = mNextObjectHint; 1074 1075 if (N > 0) { 1076 LOGV("Parcel %p looking for obj at %d, hint=%d\n", 1077 this, DPOS, opos); 1078 1079 // Start at the current hint position, looking for an object at 1080 // the current data position. 1081 if (opos < N) { 1082 while (opos < (N-1) && OBJS[opos] < DPOS) { 1083 opos++; 1084 } 1085 } else { 1086 opos = N-1; 1087 } 1088 if (OBJS[opos] == DPOS) { 1089 // Found it! 1090 LOGV("Parcel found obj %d at index %d with forward search", 1091 this, DPOS, opos); 1092 mNextObjectHint = opos+1; 1093 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1094 return obj; 1095 } 1096 1097 // Look backwards for it... 1098 while (opos > 0 && OBJS[opos] > DPOS) { 1099 opos--; 1100 } 1101 if (OBJS[opos] == DPOS) { 1102 // Found it! 1103 LOGV("Parcel found obj %d at index %d with backward search", 1104 this, DPOS, opos); 1105 mNextObjectHint = opos+1; 1106 LOGV("readObject Setting data pos of %p to %d\n", this, mDataPos); 1107 return obj; 1108 } 1109 } 1110 LOGW("Attempt to read object from Parcel %p at offset %d that is not in the object list", 1111 this, DPOS); 1112 } 1113 return NULL; 1114 } 1115 1116 void Parcel::closeFileDescriptors() 1117 { 1118 size_t i = mObjectsSize; 1119 if (i > 0) { 1120 //LOGI("Closing file descriptors for %d objects...", mObjectsSize); 1121 } 1122 while (i > 0) { 1123 i--; 1124 const flat_binder_object* flat 1125 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1126 if (flat->type == BINDER_TYPE_FD) { 1127 //LOGI("Closing fd: %ld\n", flat->handle); 1128 close(flat->handle); 1129 } 1130 } 1131 } 1132 1133 const uint8_t* Parcel::ipcData() const 1134 { 1135 return mData; 1136 } 1137 1138 size_t Parcel::ipcDataSize() const 1139 { 1140 return (mDataSize > mDataPos ? mDataSize : mDataPos); 1141 } 1142 1143 const size_t* Parcel::ipcObjects() const 1144 { 1145 return mObjects; 1146 } 1147 1148 size_t Parcel::ipcObjectsCount() const 1149 { 1150 return mObjectsSize; 1151 } 1152 1153 void Parcel::ipcSetDataReference(const uint8_t* data, size_t dataSize, 1154 const size_t* objects, size_t objectsCount, release_func relFunc, void* relCookie) 1155 { 1156 freeDataNoInit(); 1157 mError = NO_ERROR; 1158 mData = const_cast<uint8_t*>(data); 1159 mDataSize = mDataCapacity = dataSize; 1160 //LOGI("setDataReference Setting data size of %p to %lu (pid=%d)\n", this, mDataSize, getpid()); 1161 mDataPos = 0; 1162 LOGV("setDataReference Setting data pos of %p to %d\n", this, mDataPos); 1163 mObjects = const_cast<size_t*>(objects); 1164 mObjectsSize = mObjectsCapacity = objectsCount; 1165 mNextObjectHint = 0; 1166 mOwner = relFunc; 1167 mOwnerCookie = relCookie; 1168 scanForFds(); 1169 } 1170 1171 void Parcel::print(TextOutput& to, uint32_t flags) const 1172 { 1173 to << "Parcel("; 1174 1175 if (errorCheck() != NO_ERROR) { 1176 const status_t err = errorCheck(); 1177 to << "Error: " << (void*)err << " \"" << strerror(-err) << "\""; 1178 } else if (dataSize() > 0) { 1179 const uint8_t* DATA = data(); 1180 to << indent << HexDump(DATA, dataSize()) << dedent; 1181 const size_t* OBJS = objects(); 1182 const size_t N = objectsCount(); 1183 for (size_t i=0; i<N; i++) { 1184 const flat_binder_object* flat 1185 = reinterpret_cast<const flat_binder_object*>(DATA+OBJS[i]); 1186 to << endl << "Object #" << i << " @ " << (void*)OBJS[i] << ": " 1187 << TypeCode(flat->type & 0x7f7f7f00) 1188 << " = " << flat->binder; 1189 } 1190 } else { 1191 to << "NULL"; 1192 } 1193 1194 to << ")"; 1195 } 1196 1197 void Parcel::releaseObjects() 1198 { 1199 const sp<ProcessState> proc(ProcessState::self()); 1200 size_t i = mObjectsSize; 1201 uint8_t* const data = mData; 1202 size_t* const objects = mObjects; 1203 while (i > 0) { 1204 i--; 1205 const flat_binder_object* flat 1206 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1207 release_object(proc, *flat, this); 1208 } 1209 } 1210 1211 void Parcel::acquireObjects() 1212 { 1213 const sp<ProcessState> proc(ProcessState::self()); 1214 size_t i = mObjectsSize; 1215 uint8_t* const data = mData; 1216 size_t* const objects = mObjects; 1217 while (i > 0) { 1218 i--; 1219 const flat_binder_object* flat 1220 = reinterpret_cast<flat_binder_object*>(data+objects[i]); 1221 acquire_object(proc, *flat, this); 1222 } 1223 } 1224 1225 void Parcel::freeData() 1226 { 1227 freeDataNoInit(); 1228 initState(); 1229 } 1230 1231 void Parcel::freeDataNoInit() 1232 { 1233 if (mOwner) { 1234 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1235 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1236 } else { 1237 releaseObjects(); 1238 if (mData) free(mData); 1239 if (mObjects) free(mObjects); 1240 } 1241 } 1242 1243 status_t Parcel::growData(size_t len) 1244 { 1245 size_t newSize = ((mDataSize+len)*3)/2; 1246 return (newSize <= mDataSize) 1247 ? (status_t) NO_MEMORY 1248 : continueWrite(newSize); 1249 } 1250 1251 status_t Parcel::restartWrite(size_t desired) 1252 { 1253 if (mOwner) { 1254 freeData(); 1255 return continueWrite(desired); 1256 } 1257 1258 uint8_t* data = (uint8_t*)realloc(mData, desired); 1259 if (!data && desired > mDataCapacity) { 1260 mError = NO_MEMORY; 1261 return NO_MEMORY; 1262 } 1263 1264 releaseObjects(); 1265 1266 if (data) { 1267 mData = data; 1268 mDataCapacity = desired; 1269 } 1270 1271 mDataSize = mDataPos = 0; 1272 LOGV("restartWrite Setting data size of %p to %d\n", this, mDataSize); 1273 LOGV("restartWrite Setting data pos of %p to %d\n", this, mDataPos); 1274 1275 free(mObjects); 1276 mObjects = NULL; 1277 mObjectsSize = mObjectsCapacity = 0; 1278 mNextObjectHint = 0; 1279 mHasFds = false; 1280 mFdsKnown = true; 1281 1282 return NO_ERROR; 1283 } 1284 1285 status_t Parcel::continueWrite(size_t desired) 1286 { 1287 // If shrinking, first adjust for any objects that appear 1288 // after the new data size. 1289 size_t objectsSize = mObjectsSize; 1290 if (desired < mDataSize) { 1291 if (desired == 0) { 1292 objectsSize = 0; 1293 } else { 1294 while (objectsSize > 0) { 1295 if (mObjects[objectsSize-1] < desired) 1296 break; 1297 objectsSize--; 1298 } 1299 } 1300 } 1301 1302 if (mOwner) { 1303 // If the size is going to zero, just release the owner's data. 1304 if (desired == 0) { 1305 freeData(); 1306 return NO_ERROR; 1307 } 1308 1309 // If there is a different owner, we need to take 1310 // posession. 1311 uint8_t* data = (uint8_t*)malloc(desired); 1312 if (!data) { 1313 mError = NO_MEMORY; 1314 return NO_MEMORY; 1315 } 1316 size_t* objects = NULL; 1317 1318 if (objectsSize) { 1319 objects = (size_t*)malloc(objectsSize*sizeof(size_t)); 1320 if (!objects) { 1321 mError = NO_MEMORY; 1322 return NO_MEMORY; 1323 } 1324 1325 // Little hack to only acquire references on objects 1326 // we will be keeping. 1327 size_t oldObjectsSize = mObjectsSize; 1328 mObjectsSize = objectsSize; 1329 acquireObjects(); 1330 mObjectsSize = oldObjectsSize; 1331 } 1332 1333 if (mData) { 1334 memcpy(data, mData, mDataSize < desired ? mDataSize : desired); 1335 } 1336 if (objects && mObjects) { 1337 memcpy(objects, mObjects, objectsSize*sizeof(size_t)); 1338 } 1339 //LOGI("Freeing data ref of %p (pid=%d)\n", this, getpid()); 1340 mOwner(this, mData, mDataSize, mObjects, mObjectsSize, mOwnerCookie); 1341 mOwner = NULL; 1342 1343 mData = data; 1344 mObjects = objects; 1345 mDataSize = (mDataSize < desired) ? mDataSize : desired; 1346 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1347 mDataCapacity = desired; 1348 mObjectsSize = mObjectsCapacity = objectsSize; 1349 mNextObjectHint = 0; 1350 1351 } else if (mData) { 1352 if (objectsSize < mObjectsSize) { 1353 // Need to release refs on any objects we are dropping. 1354 const sp<ProcessState> proc(ProcessState::self()); 1355 for (size_t i=objectsSize; i<mObjectsSize; i++) { 1356 const flat_binder_object* flat 1357 = reinterpret_cast<flat_binder_object*>(mData+mObjects[i]); 1358 if (flat->type == BINDER_TYPE_FD) { 1359 // will need to rescan because we may have lopped off the only FDs 1360 mFdsKnown = false; 1361 } 1362 release_object(proc, *flat, this); 1363 } 1364 size_t* objects = 1365 (size_t*)realloc(mObjects, objectsSize*sizeof(size_t)); 1366 if (objects) { 1367 mObjects = objects; 1368 } 1369 mObjectsSize = objectsSize; 1370 mNextObjectHint = 0; 1371 } 1372 1373 // We own the data, so we can just do a realloc(). 1374 if (desired > mDataCapacity) { 1375 uint8_t* data = (uint8_t*)realloc(mData, desired); 1376 if (data) { 1377 mData = data; 1378 mDataCapacity = desired; 1379 } else if (desired > mDataCapacity) { 1380 mError = NO_MEMORY; 1381 return NO_MEMORY; 1382 } 1383 } else { 1384 mDataSize = desired; 1385 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1386 if (mDataPos > desired) { 1387 mDataPos = desired; 1388 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1389 } 1390 } 1391 1392 } else { 1393 // This is the first data. Easy! 1394 uint8_t* data = (uint8_t*)malloc(desired); 1395 if (!data) { 1396 mError = NO_MEMORY; 1397 return NO_MEMORY; 1398 } 1399 1400 if(!(mDataCapacity == 0 && mObjects == NULL 1401 && mObjectsCapacity == 0)) { 1402 LOGE("continueWrite: %d/%p/%d/%d", mDataCapacity, mObjects, mObjectsCapacity, desired); 1403 } 1404 1405 mData = data; 1406 mDataSize = mDataPos = 0; 1407 LOGV("continueWrite Setting data size of %p to %d\n", this, mDataSize); 1408 LOGV("continueWrite Setting data pos of %p to %d\n", this, mDataPos); 1409 mDataCapacity = desired; 1410 } 1411 1412 return NO_ERROR; 1413 } 1414 1415 void Parcel::initState() 1416 { 1417 mError = NO_ERROR; 1418 mData = 0; 1419 mDataSize = 0; 1420 mDataCapacity = 0; 1421 mDataPos = 0; 1422 LOGV("initState Setting data size of %p to %d\n", this, mDataSize); 1423 LOGV("initState Setting data pos of %p to %d\n", this, mDataPos); 1424 mObjects = NULL; 1425 mObjectsSize = 0; 1426 mObjectsCapacity = 0; 1427 mNextObjectHint = 0; 1428 mHasFds = false; 1429 mFdsKnown = true; 1430 mOwner = NULL; 1431 } 1432 1433 void Parcel::scanForFds() const 1434 { 1435 bool hasFds = false; 1436 for (size_t i=0; i<mObjectsSize; i++) { 1437 const flat_binder_object* flat 1438 = reinterpret_cast<const flat_binder_object*>(mData + mObjects[i]); 1439 if (flat->type == BINDER_TYPE_FD) { 1440 hasFds = true; 1441 break; 1442 } 1443 } 1444 mHasFds = hasFds; 1445 mFdsKnown = true; 1446 } 1447 1448 }; // namespace android 1449
