diff options
author | Dan Albert <danalbert@google.com> | 2015-02-25 17:51:28 -0800 |
---|---|---|
committer | Dan Albert <danalbert@google.com> | 2015-03-09 14:06:11 -0700 |
commit | bac3474a8256cb32a29e8d46f78cad95a5502692 (patch) | |
tree | 9763c3cb2f5e640c7061cffb47d61274a37baab8 /adb/transport_local.cpp | |
parent | 9b1fd969a7b7f1c6f1ed19719f21d57001d3c461 (diff) | |
download | system_core-bac3474a8256cb32a29e8d46f78cad95a5502692.zip system_core-bac3474a8256cb32a29e8d46f78cad95a5502692.tar.gz system_core-bac3474a8256cb32a29e8d46f78cad95a5502692.tar.bz2 |
Move adb to C++.
I keep trying to clean things up and needing std::strings. Might as
well just do this now.
usb_linux_client.c is going to stay as C because GCC isn't smart
enough to deal with the designated initializers it uses (though for
some reason it is in C mode).
The Darwin files are staying as C because I don't have a way to test
that they build.
The Windows files are staying as C because while I can actually build
for them, it's slow and painful.
Change-Id: I75367d29205a9049d34460032b3bb36384f43941
Diffstat (limited to 'adb/transport_local.cpp')
-rw-r--r-- | adb/transport_local.cpp | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/adb/transport_local.cpp b/adb/transport_local.cpp new file mode 100644 index 0000000..440d4c5 --- /dev/null +++ b/adb/transport_local.cpp @@ -0,0 +1,419 @@ +/* + * 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. + */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> + +#include "sysdeps.h" + +#define TRACE_TAG TRACE_TRANSPORT +#include "adb.h" +#include "adb_io.h" +#if !ADB_HOST +#include "cutils/properties.h" +#endif +#include "transport.h" + +#if ADB_HOST +/* 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. + */ +#define ADB_LOCAL_TRANSPORT_MAX 64 + +ADB_MUTEX_DEFINE( local_transports_lock ); + +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)\n"); + return -1; + } + + if(check_header(p)) { + D("bad header: terminated (data)\n"); + return -1; + } + + if(!ReadFdExactly(t->sfd, p->data, p->msg.data_length)){ + D("remote local: terminated (data)\n"); + return -1; + } + + if(check_data(p)) { + D("bad data: terminated (data)\n"); + 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\n"); + return -1; + } + + return 0; +} + + +int local_connect(int port) { + return local_connect_arbitrary_ports(port-1, port); +} + +int local_connect_arbitrary_ports(int console_port, int adb_port) +{ + char buf[64]; + int fd = -1; + +#if ADB_HOST + const char *host = getenv("ADBHOST"); + if (host) { + fd = socket_network_client(host, adb_port, SOCK_STREAM); + } +#endif + if (fd < 0) { + fd = socket_loopback_client(adb_port, SOCK_STREAM); + } + + if (fd >= 0) { + D("client: connected on remote on fd %d\n", fd); + close_on_exec(fd); + disable_tcp_nagle(fd); + snprintf(buf, sizeof buf, "%s%d", LOCAL_CLIENT_PREFIX, console_port); + register_socket_transport(fd, buf, adb_port, 1); + return 0; + } + return -1; +} + + +static void *client_socket_thread(void *x) +{ +#if ADB_HOST + int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT; + int count = ADB_LOCAL_TRANSPORT_MAX; + + D("transport: client_socket_thread() starting\n"); + + /* try to connect to any number of running emulator instances */ + /* this is only done when ADB starts up. later, each new emulator */ + /* will send a message to ADB to indicate that is is starting up */ + for ( ; count > 0; count--, port += 2 ) { + (void) local_connect(port); + } +#endif + return 0; +} + +static void *server_socket_thread(void * arg) +{ + int serverfd, fd; + struct sockaddr addr; + socklen_t alen; + int port = (int) (uintptr_t) arg; + + D("transport: server_socket_thread() starting\n"); + serverfd = -1; + for(;;) { + if(serverfd == -1) { + serverfd = socket_inaddr_any_server(port, SOCK_STREAM); + if(serverfd < 0) { + D("server: cannot bind socket yet\n"); + adb_sleep_ms(1000); + continue; + } + close_on_exec(serverfd); + } + + alen = sizeof(addr); + D("server: trying to get new connection from %d\n", port); + fd = adb_socket_accept(serverfd, &addr, &alen); + if(fd >= 0) { + D("server: new connection on fd %d\n", fd); + close_on_exec(fd); + disable_tcp_nagle(fd); + register_socket_transport(fd, "host", port, 1); + } + } + D("transport: server_socket_thread() exiting\n"); + return 0; +} + +/* This is relevant only for ADB daemon running inside the emulator. */ +#if !ADB_HOST +/* + * 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 res, fd; + char tmp[256]; + char con_name[32]; + + D("transport: qemu_socket_thread() starting\n"); + + /* 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. */ + adb_thread_t thr; + D("adb service is not available. Falling back to TCP socket.\n"); + adb_thread_create(&thr, server_socket_thread, arg); + return 0; + } + + for(;;) { + /* + * Wait till the host creates a new connection. + */ + + /* Send the 'accept' request. */ + res = adb_write(fd, _accept_req, strlen(_accept_req)); + if ((size_t)res == strlen(_accept_req)) { + /* Wait for the response. In the response we expect 'ok' on success, + * or 'ko' on failure. */ + res = adb_read(fd, tmp, sizeof(tmp)); + if (res != 2 || memcmp(tmp, _ok_resp, 2)) { + D("Accepting ADB host connection has failed.\n"); + adb_close(fd); + } else { + /* Host is connected. Register the transport, and start the + * exchange. */ + register_socket_transport(fd, "host", port, 1); + adb_write(fd, _start_req, strlen(_start_req)); + } + + /* Prepare for accepting of the next ADB host connection. */ + fd = qemu_pipe_open(con_name); + if (fd < 0) { + D("adb service become unavailable.\n"); + return 0; + } + } else { + D("Unable to send the '%s' request to ADB service.\n", _accept_req); + return 0; + } + } + D("transport: qemu_socket_thread() exiting\n"); + return 0; +} +#endif // !ADB_HOST + +void local_init(int port) +{ + adb_thread_t thr; + void* (*func)(void *); + + if(HOST) { + func = client_socket_thread; + } else { +#if ADB_HOST + func = server_socket_thread; +#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; + } +#endif // !ADB_HOST + } + + D("transport: local %s init\n", HOST ? "client" : "server"); + + if(adb_thread_create(&thr, func, (void *) (uintptr_t) port)) { + fatal_errno("cannot create local socket %s thread", + HOST ? "client" : "server"); + } +} + +static void remote_kick(atransport *t) +{ + int fd = t->sfd; + t->sfd = -1; + adb_shutdown(fd); + adb_close(fd); + +#if ADB_HOST + if(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) +{ + adb_close(t->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->kick = 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 = CS_OFFLINE; + t->type = kTransportLocal; + t->adb_port = 0; + +#if ADB_HOST + if (HOST && 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)?\n", + adb_port, existing_transport); + fail = -1; + } else if (index < 0) { + // Too many emulators. + D("cannot register more emulators. Maximum is %d\n", + ADB_LOCAL_TRANSPORT_MAX); + fail = -1; + } else { + local_transports[index] = t; + } + } + adb_mutex_unlock( &local_transports_lock ); + } +#endif + return fail; +} |