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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "sysdeps.h"
#include <sys/types.h>
#define TRACE_TAG TRACE_TRANSPORT
#include "adb.h"
#ifdef HAVE_BIG_ENDIAN
#define H4(x) (((x) & 0xFF000000) >> 24) | (((x) & 0x00FF0000) >> 8) | (((x) & 0x0000FF00) << 8) | (((x) & 0x000000FF) << 24)
static inline void fix_endians(apacket *p)
{
p->msg.command = H4(p->msg.command);
p->msg.arg0 = H4(p->msg.arg0);
p->msg.arg1 = H4(p->msg.arg1);
p->msg.data_length = H4(p->msg.data_length);
p->msg.data_check = H4(p->msg.data_check);
p->msg.magic = H4(p->msg.magic);
}
#else
#define fix_endians(p) do {} while (0)
#endif
#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 16
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(readx(t->sfd, &p->msg, sizeof(amessage))){
D("remote local: read terminated (message)\n");
return -1;
}
fix_endians(p);
#if 0 && defined HAVE_BIG_ENDIAN
D("read remote packet: %04x arg0=%0x arg1=%0x data_length=%0x data_check=%0x magic=%0x\n",
p->msg.command, p->msg.arg0, p->msg.arg1, p->msg.data_length, p->msg.data_check, p->msg.magic);
#endif
if(check_header(p)) {
D("bad header: terminated (data)\n");
return -1;
}
if(readx(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;
fix_endians(p);
#if 0 && defined HAVE_BIG_ENDIAN
D("write remote packet: %04x arg0=%0x arg1=%0x data_length=%0x data_check=%0x magic=%0x\n",
p->msg.command, p->msg.arg0, p->msg.arg1, p->msg.data_length, p->msg.data_check, p->msg.magic);
#endif
if(writex(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)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)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 (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 *)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;
}