| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define TRACE_TAG TRANSPORT |
| |
| #include "sysdeps.h" |
| #include "transport.h" |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/types.h> |
| |
| #include <android-base/stringprintf.h> |
| #include <cutils/sockets.h> |
| |
| #if !ADB_HOST |
| #include "cutils/properties.h" |
| #endif |
| |
| #include "adb.h" |
| #include "adb_io.h" |
| #include "adb_utils.h" |
| |
| #if ADB_HOST |
| |
| // Android Wear has been using port 5601 in all of its documentation/tooling, |
| // but we search for emulators on ports [5554, 5555 + ADB_LOCAL_TRANSPORT_MAX]. |
| // Avoid stomping on their port by limiting the number of emulators that can be |
| // connected. |
| #define ADB_LOCAL_TRANSPORT_MAX 16 |
| |
| ADB_MUTEX_DEFINE(local_transports_lock); |
| |
| /* we keep a list of opened transports. The atransport struct knows to which |
| * local transport it is connected. The list is used to detect when we're |
| * trying to connect twice to a given local transport. |
| */ |
| static atransport* local_transports[ ADB_LOCAL_TRANSPORT_MAX ]; |
| #endif /* ADB_HOST */ |
| |
| static int remote_read(apacket *p, atransport *t) |
| { |
| if(!ReadFdExactly(t->sfd, &p->msg, sizeof(amessage))){ |
| D("remote local: read terminated (message)"); |
| return -1; |
| } |
| |
| if(check_header(p, t)) { |
| D("bad header: terminated (data)"); |
| return -1; |
| } |
| |
| if(!ReadFdExactly(t->sfd, p->data, p->msg.data_length)){ |
| D("remote local: terminated (data)"); |
| return -1; |
| } |
| |
| if(check_data(p)) { |
| D("bad data: terminated (data)"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int remote_write(apacket *p, atransport *t) |
| { |
| int length = p->msg.data_length; |
| |
| if(!WriteFdExactly(t->sfd, &p->msg, sizeof(amessage) + length)) { |
| D("remote local: write terminated"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| void local_connect(int port) { |
| std::string dummy; |
| local_connect_arbitrary_ports(port-1, port, &dummy); |
| } |
| |
| int local_connect_arbitrary_ports(int console_port, int adb_port, std::string* error) { |
| int fd = -1; |
| |
| #if ADB_HOST |
| if (find_emulator_transport_by_adb_port(adb_port) != nullptr) { |
| return -1; |
| } |
| |
| const char *host = getenv("ADBHOST"); |
| if (host) { |
| fd = network_connect(host, adb_port, SOCK_STREAM, 0, error); |
| } |
| #endif |
| if (fd < 0) { |
| fd = network_loopback_client(adb_port, SOCK_STREAM, error); |
| } |
| |
| if (fd >= 0) { |
| D("client: connected on remote on fd %d", fd); |
| close_on_exec(fd); |
| disable_tcp_nagle(fd); |
| std::string serial = android::base::StringPrintf("emulator-%d", console_port); |
| if (register_socket_transport(fd, serial.c_str(), adb_port, 1) == 0) { |
| return 0; |
| } |
| adb_close(fd); |
| } |
| return -1; |
| } |
| |
| #if ADB_HOST |
| static void client_socket_thread(void* x) { |
| adb_thread_setname("client_socket_thread"); |
| D("transport: client_socket_thread() starting"); |
| while (true) { |
| int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT; |
| int count = ADB_LOCAL_TRANSPORT_MAX; |
| |
| // Try to connect to any number of running emulator instances. |
| for ( ; count > 0; count--, port += 2 ) { |
| local_connect(port); |
| } |
| sleep(1); |
| } |
| } |
| |
| #else // ADB_HOST |
| |
| static void server_socket_thread(void* arg) { |
| int serverfd, fd; |
| sockaddr_storage ss; |
| sockaddr *addrp = reinterpret_cast<sockaddr*>(&ss); |
| socklen_t alen; |
| int port = (int) (uintptr_t) arg; |
| |
| adb_thread_setname("server socket"); |
| D("transport: server_socket_thread() starting"); |
| serverfd = -1; |
| for(;;) { |
| if(serverfd == -1) { |
| std::string error; |
| serverfd = network_inaddr_any_server(port, SOCK_STREAM, &error); |
| if(serverfd < 0) { |
| D("server: cannot bind socket yet: %s", error.c_str()); |
| adb_sleep_ms(1000); |
| continue; |
| } |
| close_on_exec(serverfd); |
| } |
| |
| alen = sizeof(ss); |
| D("server: trying to get new connection from %d", port); |
| fd = adb_socket_accept(serverfd, addrp, &alen); |
| if(fd >= 0) { |
| D("server: new connection on fd %d", fd); |
| close_on_exec(fd); |
| disable_tcp_nagle(fd); |
| register_socket_transport(fd, "host", port, 1); |
| } |
| } |
| D("transport: server_socket_thread() exiting"); |
| } |
| |
| /* This is relevant only for ADB daemon running inside the emulator. */ |
| /* |
| * Redefine open and write for qemu_pipe.h that contains inlined references |
| * to those routines. We will redifine them back after qemu_pipe.h inclusion. |
| */ |
| #undef open |
| #undef write |
| #define open adb_open |
| #define write adb_write |
| #include <hardware/qemu_pipe.h> |
| #undef open |
| #undef write |
| #define open ___xxx_open |
| #define write ___xxx_write |
| |
| /* A worker thread that monitors host connections, and registers a transport for |
| * every new host connection. This thread replaces server_socket_thread on |
| * condition that adbd daemon runs inside the emulator, and emulator uses QEMUD |
| * pipe to communicate with adbd daemon inside the guest. This is done in order |
| * to provide more robust communication channel between ADB host and guest. The |
| * main issue with server_socket_thread approach is that it runs on top of TCP, |
| * and thus is sensitive to network disruptions. For instance, the |
| * ConnectionManager may decide to reset all network connections, in which case |
| * the connection between ADB host and guest will be lost. To make ADB traffic |
| * independent from the network, we use here 'adb' QEMUD service to transfer data |
| * between the host, and the guest. See external/qemu/android/adb-*.* that |
| * implements the emulator's side of the protocol. Another advantage of using |
| * QEMUD approach is that ADB will be up much sooner, since it doesn't depend |
| * anymore on network being set up. |
| * The guest side of the protocol contains the following phases: |
| * - Connect with adb QEMUD service. In this phase a handle to 'adb' QEMUD service |
| * is opened, and it becomes clear whether or not emulator supports that |
| * protocol. |
| * - Wait for the ADB host to create connection with the guest. This is done by |
| * sending an 'accept' request to the adb QEMUD service, and waiting on |
| * response. |
| * - When new ADB host connection is accepted, the connection with adb QEMUD |
| * service is registered as the transport, and a 'start' request is sent to the |
| * adb QEMUD service, indicating that the guest is ready to receive messages. |
| * Note that the guest will ignore messages sent down from the emulator before |
| * the transport registration is completed. That's why we need to send the |
| * 'start' request after the transport is registered. |
| */ |
| static void qemu_socket_thread(void* arg) { |
| /* 'accept' request to the adb QEMUD service. */ |
| static const char _accept_req[] = "accept"; |
| /* 'start' request to the adb QEMUD service. */ |
| static const char _start_req[] = "start"; |
| /* 'ok' reply from the adb QEMUD service. */ |
| static const char _ok_resp[] = "ok"; |
| |
| const int port = (int) (uintptr_t) arg; |
| int fd; |
| char tmp[256]; |
| char con_name[32]; |
| |
| adb_thread_setname("qemu socket"); |
| D("transport: qemu_socket_thread() starting"); |
| |
| /* adb QEMUD service connection request. */ |
| snprintf(con_name, sizeof(con_name), "qemud:adb:%d", port); |
| |
| /* Connect to the adb QEMUD service. */ |
| fd = qemu_pipe_open(con_name); |
| if (fd < 0) { |
| /* This could be an older version of the emulator, that doesn't |
| * implement adb QEMUD service. Fall back to the old TCP way. */ |
| D("adb service is not available. Falling back to TCP socket."); |
| adb_thread_create(server_socket_thread, arg); |
| return; |
| } |
| |
| for(;;) { |
| /* |
| * Wait till the host creates a new connection. |
| */ |
| |
| /* Send the 'accept' request. */ |
| if (WriteFdExactly(fd, _accept_req, strlen(_accept_req))) { |
| /* Wait for the response. In the response we expect 'ok' on success, |
| * or 'ko' on failure. */ |
| if (!ReadFdExactly(fd, tmp, 2) || memcmp(tmp, _ok_resp, 2)) { |
| D("Accepting ADB host connection has failed."); |
| adb_close(fd); |
| } else { |
| /* Host is connected. Register the transport, and start the |
| * exchange. */ |
| std::string serial = android::base::StringPrintf("host-%d", fd); |
| register_socket_transport(fd, serial.c_str(), port, 1); |
| if (!WriteFdExactly(fd, _start_req, strlen(_start_req))) { |
| adb_close(fd); |
| } |
| } |
| |
| /* Prepare for accepting of the next ADB host connection. */ |
| fd = qemu_pipe_open(con_name); |
| if (fd < 0) { |
| D("adb service become unavailable."); |
| return; |
| } |
| } else { |
| D("Unable to send the '%s' request to ADB service.", _accept_req); |
| return; |
| } |
| } |
| D("transport: qemu_socket_thread() exiting"); |
| return; |
| } |
| #endif // !ADB_HOST |
| |
| void local_init(int port) |
| { |
| adb_thread_func_t func; |
| const char* debug_name = ""; |
| |
| #if ADB_HOST |
| func = client_socket_thread; |
| debug_name = "client"; |
| #else |
| /* For the adbd daemon in the system image we need to distinguish |
| * between the device, and the emulator. */ |
| char is_qemu[PROPERTY_VALUE_MAX]; |
| property_get("ro.kernel.qemu", is_qemu, ""); |
| if (!strcmp(is_qemu, "1")) { |
| /* Running inside the emulator: use QEMUD pipe as the transport. */ |
| func = qemu_socket_thread; |
| } else { |
| /* Running inside the device: use TCP socket as the transport. */ |
| func = server_socket_thread; |
| } |
| debug_name = "server"; |
| #endif // !ADB_HOST |
| |
| D("transport: local %s init", debug_name); |
| if (!adb_thread_create(func, (void *) (uintptr_t) port)) { |
| fatal_errno("cannot create local socket %s thread", debug_name); |
| } |
| } |
| |
| static void remote_kick(atransport *t) |
| { |
| int fd = t->sfd; |
| t->sfd = -1; |
| adb_shutdown(fd); |
| adb_close(fd); |
| |
| #if ADB_HOST |
| int nn; |
| adb_mutex_lock( &local_transports_lock ); |
| for (nn = 0; nn < ADB_LOCAL_TRANSPORT_MAX; nn++) { |
| if (local_transports[nn] == t) { |
| local_transports[nn] = NULL; |
| break; |
| } |
| } |
| adb_mutex_unlock( &local_transports_lock ); |
| #endif |
| } |
| |
| static void remote_close(atransport *t) |
| { |
| int fd = t->sfd; |
| if (fd != -1) { |
| t->sfd = -1; |
| adb_close(fd); |
| } |
| } |
| |
| |
| #if ADB_HOST |
| /* Only call this function if you already hold local_transports_lock. */ |
| atransport* find_emulator_transport_by_adb_port_locked(int adb_port) |
| { |
| int i; |
| for (i = 0; i < ADB_LOCAL_TRANSPORT_MAX; i++) { |
| if (local_transports[i] && local_transports[i]->adb_port == adb_port) { |
| return local_transports[i]; |
| } |
| } |
| return NULL; |
| } |
| |
| atransport* find_emulator_transport_by_adb_port(int adb_port) |
| { |
| adb_mutex_lock( &local_transports_lock ); |
| atransport* result = find_emulator_transport_by_adb_port_locked(adb_port); |
| adb_mutex_unlock( &local_transports_lock ); |
| return result; |
| } |
| |
| /* Only call this function if you already hold local_transports_lock. */ |
| int get_available_local_transport_index_locked() |
| { |
| int i; |
| for (i = 0; i < ADB_LOCAL_TRANSPORT_MAX; i++) { |
| if (local_transports[i] == NULL) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| int get_available_local_transport_index() |
| { |
| adb_mutex_lock( &local_transports_lock ); |
| int result = get_available_local_transport_index_locked(); |
| adb_mutex_unlock( &local_transports_lock ); |
| return result; |
| } |
| #endif |
| |
| int init_socket_transport(atransport *t, int s, int adb_port, int local) |
| { |
| int fail = 0; |
| |
| t->SetKickFunction(remote_kick); |
| t->close = remote_close; |
| t->read_from_remote = remote_read; |
| t->write_to_remote = remote_write; |
| t->sfd = s; |
| t->sync_token = 1; |
| t->connection_state = kCsOffline; |
| t->type = kTransportLocal; |
| t->adb_port = 0; |
| |
| #if ADB_HOST |
| if (local) { |
| adb_mutex_lock( &local_transports_lock ); |
| { |
| t->adb_port = adb_port; |
| atransport* existing_transport = |
| find_emulator_transport_by_adb_port_locked(adb_port); |
| int index = get_available_local_transport_index_locked(); |
| if (existing_transport != NULL) { |
| D("local transport for port %d already registered (%p)?", |
| adb_port, existing_transport); |
| fail = -1; |
| } else if (index < 0) { |
| // Too many emulators. |
| D("cannot register more emulators. Maximum is %d", |
| ADB_LOCAL_TRANSPORT_MAX); |
| fail = -1; |
| } else { |
| local_transports[index] = t; |
| } |
| } |
| adb_mutex_unlock( &local_transports_lock ); |
| } |
| #endif |
| return fail; |
| } |
