1 /* 2 * Copyright (C) 2007 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 TRACE_TAG SOCKETS 18 19 #include "sysdeps.h" 20 21 #include <ctype.h> 22 #include <errno.h> 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <unistd.h> 27 28 #include <algorithm> 29 #include <mutex> 30 #include <string> 31 #include <vector> 32 33 #if !ADB_HOST 34 #include "cutils/properties.h" 35 #endif 36 37 #include "adb.h" 38 #include "adb_io.h" 39 #include "sysdeps/mutex.h" 40 #include "transport.h" 41 42 static std::recursive_mutex& local_socket_list_lock = *new std::recursive_mutex(); 43 static unsigned local_socket_next_id = 1; 44 45 static asocket local_socket_list = { 46 .next = &local_socket_list, .prev = &local_socket_list, 47 }; 48 49 /* the the list of currently closing local sockets. 50 ** these have no peer anymore, but still packets to 51 ** write to their fd. 52 */ 53 static asocket local_socket_closing_list = { 54 .next = &local_socket_closing_list, .prev = &local_socket_closing_list, 55 }; 56 57 // Parse the global list of sockets to find one with id |local_id|. 58 // If |peer_id| is not 0, also check that it is connected to a peer 59 // with id |peer_id|. Returns an asocket handle on success, NULL on failure. 60 asocket* find_local_socket(unsigned local_id, unsigned peer_id) { 61 asocket* s; 62 asocket* result = NULL; 63 64 std::lock_guard<std::recursive_mutex> lock(local_socket_list_lock); 65 for (s = local_socket_list.next; s != &local_socket_list; s = s->next) { 66 if (s->id != local_id) { 67 continue; 68 } 69 if (peer_id == 0 || (s->peer && s->peer->id == peer_id)) { 70 result = s; 71 } 72 break; 73 } 74 75 return result; 76 } 77 78 static void insert_local_socket(asocket* s, asocket* list) { 79 s->next = list; 80 s->prev = s->next->prev; 81 s->prev->next = s; 82 s->next->prev = s; 83 } 84 85 void install_local_socket(asocket* s) { 86 std::lock_guard<std::recursive_mutex> lock(local_socket_list_lock); 87 88 s->id = local_socket_next_id++; 89 90 // Socket ids should never be 0. 91 if (local_socket_next_id == 0) { 92 fatal("local socket id overflow"); 93 } 94 95 insert_local_socket(s, &local_socket_list); 96 } 97 98 void remove_socket(asocket* s) { 99 // socket_list_lock should already be held 100 if (s->prev && s->next) { 101 s->prev->next = s->next; 102 s->next->prev = s->prev; 103 s->next = 0; 104 s->prev = 0; 105 s->id = 0; 106 } 107 } 108 109 void close_all_sockets(atransport* t) { 110 asocket* s; 111 112 /* this is a little gross, but since s->close() *will* modify 113 ** the list out from under you, your options are limited. 114 */ 115 std::lock_guard<std::recursive_mutex> lock(local_socket_list_lock); 116 restart: 117 for (s = local_socket_list.next; s != &local_socket_list; s = s->next) { 118 if (s->transport == t || (s->peer && s->peer->transport == t)) { 119 s->close(s); 120 goto restart; 121 } 122 } 123 } 124 125 static int local_socket_enqueue(asocket* s, apacket* p) { 126 D("LS(%d): enqueue %d", s->id, p->len); 127 128 p->ptr = p->data; 129 130 /* if there is already data queue'd, we will receive 131 ** events when it's time to write. just add this to 132 ** the tail 133 */ 134 if (s->pkt_first) { 135 goto enqueue; 136 } 137 138 /* write as much as we can, until we 139 ** would block or there is an error/eof 140 */ 141 while (p->len > 0) { 142 int r = adb_write(s->fd, p->ptr, p->len); 143 if (r > 0) { 144 p->len -= r; 145 p->ptr += r; 146 continue; 147 } 148 if ((r == 0) || (errno != EAGAIN)) { 149 D("LS(%d): not ready, errno=%d: %s", s->id, errno, strerror(errno)); 150 put_apacket(p); 151 s->has_write_error = true; 152 s->close(s); 153 return 1; /* not ready (error) */ 154 } else { 155 break; 156 } 157 } 158 159 if (p->len == 0) { 160 put_apacket(p); 161 return 0; /* ready for more data */ 162 } 163 164 enqueue: 165 p->next = 0; 166 if (s->pkt_first) { 167 s->pkt_last->next = p; 168 } else { 169 s->pkt_first = p; 170 } 171 s->pkt_last = p; 172 173 /* make sure we are notified when we can drain the queue */ 174 fdevent_add(&s->fde, FDE_WRITE); 175 176 return 1; /* not ready (backlog) */ 177 } 178 179 static void local_socket_ready(asocket* s) { 180 /* far side is ready for data, pay attention to 181 readable events */ 182 fdevent_add(&s->fde, FDE_READ); 183 } 184 185 // be sure to hold the socket list lock when calling this 186 static void local_socket_destroy(asocket* s) { 187 apacket *p, *n; 188 int exit_on_close = s->exit_on_close; 189 190 D("LS(%d): destroying fde.fd=%d", s->id, s->fde.fd); 191 192 /* IMPORTANT: the remove closes the fd 193 ** that belongs to this socket 194 */ 195 fdevent_remove(&s->fde); 196 197 /* dispose of any unwritten data */ 198 for (p = s->pkt_first; p; p = n) { 199 D("LS(%d): discarding %d bytes", s->id, p->len); 200 n = p->next; 201 put_apacket(p); 202 } 203 remove_socket(s); 204 free(s); 205 206 if (exit_on_close) { 207 D("local_socket_destroy: exiting"); 208 exit(1); 209 } 210 } 211 212 static void local_socket_close(asocket* s) { 213 D("entered local_socket_close. LS(%d) fd=%d", s->id, s->fd); 214 std::lock_guard<std::recursive_mutex> lock(local_socket_list_lock); 215 if (s->peer) { 216 D("LS(%d): closing peer. peer->id=%d peer->fd=%d", s->id, s->peer->id, s->peer->fd); 217 /* Note: it's important to call shutdown before disconnecting from 218 * the peer, this ensures that remote sockets can still get the id 219 * of the local socket they're connected to, to send a CLOSE() 220 * protocol event. */ 221 if (s->peer->shutdown) { 222 s->peer->shutdown(s->peer); 223 } 224 s->peer->peer = nullptr; 225 s->peer->close(s->peer); 226 s->peer = nullptr; 227 } 228 229 /* If we are already closing, or if there are no 230 ** pending packets, destroy immediately 231 */ 232 if (s->closing || s->has_write_error || s->pkt_first == NULL) { 233 int id = s->id; 234 local_socket_destroy(s); 235 D("LS(%d): closed", id); 236 return; 237 } 238 239 /* otherwise, put on the closing list 240 */ 241 D("LS(%d): closing", s->id); 242 s->closing = 1; 243 fdevent_del(&s->fde, FDE_READ); 244 remove_socket(s); 245 D("LS(%d): put on socket_closing_list fd=%d", s->id, s->fd); 246 insert_local_socket(s, &local_socket_closing_list); 247 CHECK_EQ(FDE_WRITE, s->fde.state & FDE_WRITE); 248 } 249 250 static void local_socket_event_func(int fd, unsigned ev, void* _s) { 251 asocket* s = reinterpret_cast<asocket*>(_s); 252 D("LS(%d): event_func(fd=%d(==%d), ev=%04x)", s->id, s->fd, fd, ev); 253 254 /* put the FDE_WRITE processing before the FDE_READ 255 ** in order to simplify the code. 256 */ 257 if (ev & FDE_WRITE) { 258 apacket* p; 259 while ((p = s->pkt_first) != nullptr) { 260 while (p->len > 0) { 261 int r = adb_write(fd, p->ptr, p->len); 262 if (r == -1) { 263 /* returning here is ok because FDE_READ will 264 ** be processed in the next iteration loop 265 */ 266 if (errno == EAGAIN) { 267 return; 268 } 269 } else if (r > 0) { 270 p->ptr += r; 271 p->len -= r; 272 continue; 273 } 274 275 D(" closing after write because r=%d and errno is %d", r, errno); 276 s->has_write_error = true; 277 s->close(s); 278 return; 279 } 280 281 if (p->len == 0) { 282 s->pkt_first = p->next; 283 if (s->pkt_first == 0) { 284 s->pkt_last = 0; 285 } 286 put_apacket(p); 287 } 288 } 289 290 /* if we sent the last packet of a closing socket, 291 ** we can now destroy it. 292 */ 293 if (s->closing) { 294 D(" closing because 'closing' is set after write"); 295 s->close(s); 296 return; 297 } 298 299 /* no more packets queued, so we can ignore 300 ** writable events again and tell our peer 301 ** to resume writing 302 */ 303 fdevent_del(&s->fde, FDE_WRITE); 304 s->peer->ready(s->peer); 305 } 306 307 if (ev & FDE_READ) { 308 apacket* p = get_apacket(); 309 unsigned char* x = p->data; 310 const size_t max_payload = s->get_max_payload(); 311 size_t avail = max_payload; 312 int r = 0; 313 int is_eof = 0; 314 315 while (avail > 0) { 316 r = adb_read(fd, x, avail); 317 D("LS(%d): post adb_read(fd=%d,...) r=%d (errno=%d) avail=%zu", s->id, s->fd, r, 318 r < 0 ? errno : 0, avail); 319 if (r == -1) { 320 if (errno == EAGAIN) { 321 break; 322 } 323 } else if (r > 0) { 324 avail -= r; 325 x += r; 326 continue; 327 } 328 329 /* r = 0 or unhandled error */ 330 is_eof = 1; 331 break; 332 } 333 D("LS(%d): fd=%d post avail loop. r=%d is_eof=%d forced_eof=%d", s->id, s->fd, r, is_eof, 334 s->fde.force_eof); 335 if ((avail == max_payload) || (s->peer == 0)) { 336 put_apacket(p); 337 } else { 338 p->len = max_payload - avail; 339 340 // s->peer->enqueue() may call s->close() and free s, 341 // so save variables for debug printing below. 342 unsigned saved_id = s->id; 343 int saved_fd = s->fd; 344 r = s->peer->enqueue(s->peer, p); 345 D("LS(%u): fd=%d post peer->enqueue(). r=%d", saved_id, saved_fd, r); 346 347 if (r < 0) { 348 /* error return means they closed us as a side-effect 349 ** and we must return immediately. 350 ** 351 ** note that if we still have buffered packets, the 352 ** socket will be placed on the closing socket list. 353 ** this handler function will be called again 354 ** to process FDE_WRITE events. 355 */ 356 return; 357 } 358 359 if (r > 0) { 360 /* if the remote cannot accept further events, 361 ** we disable notification of READs. They'll 362 ** be enabled again when we get a call to ready() 363 */ 364 fdevent_del(&s->fde, FDE_READ); 365 } 366 } 367 /* Don't allow a forced eof if data is still there */ 368 if ((s->fde.force_eof && !r) || is_eof) { 369 D(" closing because is_eof=%d r=%d s->fde.force_eof=%d", is_eof, r, s->fde.force_eof); 370 s->close(s); 371 return; 372 } 373 } 374 375 if (ev & FDE_ERROR) { 376 /* this should be caught be the next read or write 377 ** catching it here means we may skip the last few 378 ** bytes of readable data. 379 */ 380 D("LS(%d): FDE_ERROR (fd=%d)", s->id, s->fd); 381 return; 382 } 383 } 384 385 asocket* create_local_socket(int fd) { 386 asocket* s = reinterpret_cast<asocket*>(calloc(1, sizeof(asocket))); 387 if (s == NULL) { 388 fatal("cannot allocate socket"); 389 } 390 s->fd = fd; 391 s->enqueue = local_socket_enqueue; 392 s->ready = local_socket_ready; 393 s->shutdown = NULL; 394 s->close = local_socket_close; 395 install_local_socket(s); 396 397 fdevent_install(&s->fde, fd, local_socket_event_func, s); 398 D("LS(%d): created (fd=%d)", s->id, s->fd); 399 return s; 400 } 401 402 asocket* create_local_service_socket(const char* name, const atransport* transport) { 403 #if !ADB_HOST 404 if (!strcmp(name, "jdwp")) { 405 return create_jdwp_service_socket(); 406 } 407 if (!strcmp(name, "track-jdwp")) { 408 return create_jdwp_tracker_service_socket(); 409 } 410 #endif 411 int fd = service_to_fd(name, transport); 412 if (fd < 0) { 413 return 0; 414 } 415 416 asocket* s = create_local_socket(fd); 417 D("LS(%d): bound to '%s' via %d", s->id, name, fd); 418 419 #if !ADB_HOST 420 char debug[PROPERTY_VALUE_MAX]; 421 if (!strncmp(name, "root:", 5)) { 422 property_get("ro.debuggable", debug, ""); 423 } 424 425 if ((!strncmp(name, "root:", 5) && getuid() != 0 && strcmp(debug, "1") == 0) || 426 (!strncmp(name, "unroot:", 7) && getuid() == 0) || 427 !strncmp(name, "usb:", 4) || 428 !strncmp(name, "tcpip:", 6)) { 429 D("LS(%d): enabling exit_on_close", s->id); 430 s->exit_on_close = 1; 431 } 432 #endif 433 434 return s; 435 } 436 437 #if ADB_HOST 438 static asocket* create_host_service_socket(const char* name, const char* serial) { 439 asocket* s; 440 441 s = host_service_to_socket(name, serial); 442 443 if (s != NULL) { 444 D("LS(%d) bound to '%s'", s->id, name); 445 return s; 446 } 447 448 return s; 449 } 450 #endif /* ADB_HOST */ 451 452 static int remote_socket_enqueue(asocket* s, apacket* p) { 453 D("entered remote_socket_enqueue RS(%d) WRITE fd=%d peer.fd=%d", s->id, s->fd, s->peer->fd); 454 p->msg.command = A_WRTE; 455 p->msg.arg0 = s->peer->id; 456 p->msg.arg1 = s->id; 457 p->msg.data_length = p->len; 458 send_packet(p, s->transport); 459 return 1; 460 } 461 462 static void remote_socket_ready(asocket* s) { 463 D("entered remote_socket_ready RS(%d) OKAY fd=%d peer.fd=%d", s->id, s->fd, s->peer->fd); 464 apacket* p = get_apacket(); 465 p->msg.command = A_OKAY; 466 p->msg.arg0 = s->peer->id; 467 p->msg.arg1 = s->id; 468 send_packet(p, s->transport); 469 } 470 471 static void remote_socket_shutdown(asocket* s) { 472 D("entered remote_socket_shutdown RS(%d) CLOSE fd=%d peer->fd=%d", s->id, s->fd, 473 s->peer ? s->peer->fd : -1); 474 apacket* p = get_apacket(); 475 p->msg.command = A_CLSE; 476 if (s->peer) { 477 p->msg.arg0 = s->peer->id; 478 } 479 p->msg.arg1 = s->id; 480 send_packet(p, s->transport); 481 } 482 483 static void remote_socket_close(asocket* s) { 484 if (s->peer) { 485 s->peer->peer = 0; 486 D("RS(%d) peer->close()ing peer->id=%d peer->fd=%d", s->id, s->peer->id, s->peer->fd); 487 s->peer->close(s->peer); 488 } 489 D("entered remote_socket_close RS(%d) CLOSE fd=%d peer->fd=%d", s->id, s->fd, 490 s->peer ? s->peer->fd : -1); 491 D("RS(%d): closed", s->id); 492 free(s); 493 } 494 495 // Create a remote socket to exchange packets with a remote service through transport 496 // |t|. Where |id| is the socket id of the corresponding service on the other 497 // side of the transport (it is allocated by the remote side and _cannot_ be 0). 498 // Returns a new non-NULL asocket handle. 499 asocket* create_remote_socket(unsigned id, atransport* t) { 500 if (id == 0) { 501 fatal("invalid remote socket id (0)"); 502 } 503 asocket* s = reinterpret_cast<asocket*>(calloc(1, sizeof(asocket))); 504 505 if (s == NULL) { 506 fatal("cannot allocate socket"); 507 } 508 s->id = id; 509 s->enqueue = remote_socket_enqueue; 510 s->ready = remote_socket_ready; 511 s->shutdown = remote_socket_shutdown; 512 s->close = remote_socket_close; 513 s->transport = t; 514 515 D("RS(%d): created", s->id); 516 return s; 517 } 518 519 void connect_to_remote(asocket* s, const char* destination) { 520 D("Connect_to_remote call RS(%d) fd=%d", s->id, s->fd); 521 apacket* p = get_apacket(); 522 size_t len = strlen(destination) + 1; 523 524 if (len > (s->get_max_payload() - 1)) { 525 fatal("destination oversized"); 526 } 527 528 D("LS(%d): connect('%s')", s->id, destination); 529 p->msg.command = A_OPEN; 530 p->msg.arg0 = s->id; 531 p->msg.data_length = len; 532 strcpy((char*)p->data, destination); 533 send_packet(p, s->transport); 534 } 535 536 /* this is used by magic sockets to rig local sockets to 537 send the go-ahead message when they connect */ 538 static void local_socket_ready_notify(asocket* s) { 539 s->ready = local_socket_ready; 540 s->shutdown = NULL; 541 s->close = local_socket_close; 542 SendOkay(s->fd); 543 s->ready(s); 544 } 545 546 /* this is used by magic sockets to rig local sockets to 547 send the failure message if they are closed before 548 connected (to avoid closing them without a status message) */ 549 static void local_socket_close_notify(asocket* s) { 550 s->ready = local_socket_ready; 551 s->shutdown = NULL; 552 s->close = local_socket_close; 553 SendFail(s->fd, "closed"); 554 s->close(s); 555 } 556 557 static unsigned unhex(unsigned char* s, int len) { 558 unsigned n = 0, c; 559 560 while (len-- > 0) { 561 switch ((c = *s++)) { 562 case '0': 563 case '1': 564 case '2': 565 case '3': 566 case '4': 567 case '5': 568 case '6': 569 case '7': 570 case '8': 571 case '9': 572 c -= '0'; 573 break; 574 case 'a': 575 case 'b': 576 case 'c': 577 case 'd': 578 case 'e': 579 case 'f': 580 c = c - 'a' + 10; 581 break; 582 case 'A': 583 case 'B': 584 case 'C': 585 case 'D': 586 case 'E': 587 case 'F': 588 c = c - 'A' + 10; 589 break; 590 default: 591 return 0xffffffff; 592 } 593 594 n = (n << 4) | c; 595 } 596 597 return n; 598 } 599 600 #if ADB_HOST 601 602 namespace internal { 603 604 // Returns the position in |service| following the target serial parameter. Serial format can be 605 // any of: 606 // * [tcp:|udp:]<serial>[:<port>]:<command> 607 // * <prefix>:<serial>:<command> 608 // Where <port> must be a base-10 number and <prefix> may be any of {usb,product,model,device}. 609 // 610 // The returned pointer will point to the ':' just before <command>, or nullptr if not found. 611 char* skip_host_serial(const char* service) { 612 static const std::vector<std::string>& prefixes = 613 *(new std::vector<std::string>{"usb:", "product:", "model:", "device:"}); 614 615 for (const std::string& prefix : prefixes) { 616 if (!strncmp(service, prefix.c_str(), prefix.length())) { 617 return strchr(service + prefix.length(), ':'); 618 } 619 } 620 621 // For fastboot compatibility, ignore protocol prefixes. 622 if (!strncmp(service, "tcp:", 4) || !strncmp(service, "udp:", 4)) { 623 service += 4; 624 } 625 626 char* first_colon = strchr(service, ':'); 627 if (!first_colon) { 628 // No colon in service string. 629 return nullptr; 630 } 631 632 char* serial_end = first_colon; 633 if (isdigit(serial_end[1])) { 634 serial_end++; 635 while (*serial_end && isdigit(*serial_end)) { 636 serial_end++; 637 } 638 if (*serial_end != ':') { 639 // Something other than numbers was found, reset the end. 640 serial_end = first_colon; 641 } 642 } 643 return serial_end; 644 } 645 646 } // namespace internal 647 648 #endif // ADB_HOST 649 650 static int smart_socket_enqueue(asocket* s, apacket* p) { 651 unsigned len; 652 #if ADB_HOST 653 char* service = nullptr; 654 char* serial = nullptr; 655 TransportType type = kTransportAny; 656 #endif 657 658 D("SS(%d): enqueue %d", s->id, p->len); 659 660 if (s->pkt_first == 0) { 661 s->pkt_first = p; 662 s->pkt_last = p; 663 } else { 664 if ((s->pkt_first->len + p->len) > s->get_max_payload()) { 665 D("SS(%d): overflow", s->id); 666 put_apacket(p); 667 goto fail; 668 } 669 670 memcpy(s->pkt_first->data + s->pkt_first->len, p->data, p->len); 671 s->pkt_first->len += p->len; 672 put_apacket(p); 673 674 p = s->pkt_first; 675 } 676 677 /* don't bother if we can't decode the length */ 678 if (p->len < 4) { 679 return 0; 680 } 681 682 len = unhex(p->data, 4); 683 if ((len < 1) || (len > MAX_PAYLOAD_V1)) { 684 D("SS(%d): bad size (%d)", s->id, len); 685 goto fail; 686 } 687 688 D("SS(%d): len is %d", s->id, len); 689 /* can't do anything until we have the full header */ 690 if ((len + 4) > p->len) { 691 D("SS(%d): waiting for %d more bytes", s->id, len + 4 - p->len); 692 return 0; 693 } 694 695 p->data[len + 4] = 0; 696 697 D("SS(%d): '%s'", s->id, (char*)(p->data + 4)); 698 699 #if ADB_HOST 700 service = (char*)p->data + 4; 701 if (!strncmp(service, "host-serial:", strlen("host-serial:"))) { 702 char* serial_end; 703 service += strlen("host-serial:"); 704 705 // serial number should follow "host:" and could be a host:port string. 706 serial_end = internal::skip_host_serial(service); 707 if (serial_end) { 708 *serial_end = 0; // terminate string 709 serial = service; 710 service = serial_end + 1; 711 } 712 } else if (!strncmp(service, "host-usb:", strlen("host-usb:"))) { 713 type = kTransportUsb; 714 service += strlen("host-usb:"); 715 } else if (!strncmp(service, "host-local:", strlen("host-local:"))) { 716 type = kTransportLocal; 717 service += strlen("host-local:"); 718 } else if (!strncmp(service, "host:", strlen("host:"))) { 719 type = kTransportAny; 720 service += strlen("host:"); 721 } else { 722 service = nullptr; 723 } 724 725 if (service) { 726 asocket* s2; 727 728 /* some requests are handled immediately -- in that 729 ** case the handle_host_request() routine has sent 730 ** the OKAY or FAIL message and all we have to do 731 ** is clean up. 732 */ 733 if (handle_host_request(service, type, serial, s->peer->fd, s) == 0) { 734 /* XXX fail message? */ 735 D("SS(%d): handled host service '%s'", s->id, service); 736 goto fail; 737 } 738 if (!strncmp(service, "transport", strlen("transport"))) { 739 D("SS(%d): okay transport", s->id); 740 p->len = 0; 741 return 0; 742 } 743 744 /* try to find a local service with this name. 745 ** if no such service exists, we'll fail out 746 ** and tear down here. 747 */ 748 s2 = create_host_service_socket(service, serial); 749 if (s2 == 0) { 750 D("SS(%d): couldn't create host service '%s'", s->id, service); 751 SendFail(s->peer->fd, "unknown host service"); 752 goto fail; 753 } 754 755 /* we've connected to a local host service, 756 ** so we make our peer back into a regular 757 ** local socket and bind it to the new local 758 ** service socket, acknowledge the successful 759 ** connection, and close this smart socket now 760 ** that its work is done. 761 */ 762 SendOkay(s->peer->fd); 763 764 s->peer->ready = local_socket_ready; 765 s->peer->shutdown = nullptr; 766 s->peer->close = local_socket_close; 767 s->peer->peer = s2; 768 s2->peer = s->peer; 769 s->peer = 0; 770 D("SS(%d): okay", s->id); 771 s->close(s); 772 773 /* initial state is "ready" */ 774 s2->ready(s2); 775 return 0; 776 } 777 #else /* !ADB_HOST */ 778 if (s->transport == nullptr) { 779 std::string error_msg = "unknown failure"; 780 s->transport = acquire_one_transport(kTransportAny, nullptr, nullptr, &error_msg); 781 if (s->transport == nullptr) { 782 SendFail(s->peer->fd, error_msg); 783 goto fail; 784 } 785 } 786 #endif 787 788 if (!(s->transport) || (s->transport->connection_state == kCsOffline)) { 789 /* if there's no remote we fail the connection 790 ** right here and terminate it 791 */ 792 SendFail(s->peer->fd, "device offline (x)"); 793 goto fail; 794 } 795 796 /* instrument our peer to pass the success or fail 797 ** message back once it connects or closes, then 798 ** detach from it, request the connection, and 799 ** tear down 800 */ 801 s->peer->ready = local_socket_ready_notify; 802 s->peer->shutdown = nullptr; 803 s->peer->close = local_socket_close_notify; 804 s->peer->peer = 0; 805 /* give him our transport and upref it */ 806 s->peer->transport = s->transport; 807 808 connect_to_remote(s->peer, (char*)(p->data + 4)); 809 s->peer = 0; 810 s->close(s); 811 return 1; 812 813 fail: 814 /* we're going to close our peer as a side-effect, so 815 ** return -1 to signal that state to the local socket 816 ** who is enqueueing against us 817 */ 818 s->close(s); 819 return -1; 820 } 821 822 static void smart_socket_ready(asocket* s) { 823 D("SS(%d): ready", s->id); 824 } 825 826 static void smart_socket_close(asocket* s) { 827 D("SS(%d): closed", s->id); 828 if (s->pkt_first) { 829 put_apacket(s->pkt_first); 830 } 831 if (s->peer) { 832 s->peer->peer = 0; 833 s->peer->close(s->peer); 834 s->peer = 0; 835 } 836 free(s); 837 } 838 839 static asocket* create_smart_socket(void) { 840 D("Creating smart socket"); 841 asocket* s = reinterpret_cast<asocket*>(calloc(1, sizeof(asocket))); 842 if (s == NULL) fatal("cannot allocate socket"); 843 s->enqueue = smart_socket_enqueue; 844 s->ready = smart_socket_ready; 845 s->shutdown = NULL; 846 s->close = smart_socket_close; 847 848 D("SS(%d)", s->id); 849 return s; 850 } 851 852 void connect_to_smartsocket(asocket* s) { 853 D("Connecting to smart socket"); 854 asocket* ss = create_smart_socket(); 855 s->peer = ss; 856 ss->peer = s; 857 s->ready(s); 858 } 859 860 size_t asocket::get_max_payload() const { 861 size_t max_payload = MAX_PAYLOAD; 862 if (transport) { 863 max_payload = std::min(max_payload, transport->get_max_payload()); 864 } 865 if (peer && peer->transport) { 866 max_payload = std::min(max_payload, peer->transport->get_max_payload()); 867 } 868 return max_payload; 869 } 870
