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platform_system_core/adb/services.cpp
Elliott Hughes 18ddf5c6a2 Pass $TERM to the device. 
Unfortunately, this isn't backwards-compatible with the current shell
protocol because we made unknown shell: arguments errors. We could try
to commit the change to make them just warnings first, but how would
we know when everyone was running adbd with that change? Bumping the
protocol version doesn't help because that only affects the code running
on the host. And although we could add another feature to the reported
features, since shell_v2 is still in development, that doesn't seem
worthwhile.

Bug: http://b/25601436
Change-Id: I12b81aa656cd25b91d14ef691dcbd2b7dab49535
2015-11-16 10:55:34 -08:00

534 lines
17 KiB
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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.
*/
#define TRACE_TAG SERVICES
#include "sysdeps.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef _WIN32
#include <netdb.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <unistd.h>
#endif
#include <base/file.h>
#include <base/stringprintf.h>
#include <base/strings.h>
#include <cutils/sockets.h>
#if !ADB_HOST
#include "cutils/android_reboot.h"
#include "cutils/properties.h"
#endif
#include "adb.h"
#include "adb_io.h"
#include "adb_utils.h"
#include "file_sync_service.h"
#include "remount_service.h"
#include "services.h"
#include "shell_service.h"
#include "transport.h"
struct stinfo {
void (*func)(int fd, void *cookie);
int fd;
void *cookie;
};
void *service_bootstrap_func(void *x)
{
stinfo* sti = reinterpret_cast<stinfo*>(x);
adb_thread_setname(android::base::StringPrintf("service %d", sti->fd));
sti->func(sti->fd, sti->cookie);
free(sti);
return 0;
}
#if !ADB_HOST
void restart_root_service(int fd, void *cookie) {
if (getuid() == 0) {
WriteFdExactly(fd, "adbd is already running as root\n");
adb_close(fd);
} else {
char value[PROPERTY_VALUE_MAX];
property_get("ro.debuggable", value, "");
if (strcmp(value, "1") != 0) {
WriteFdExactly(fd, "adbd cannot run as root in production builds\n");
adb_close(fd);
return;
}
property_set("service.adb.root", "1");
WriteFdExactly(fd, "restarting adbd as root\n");
adb_close(fd);
}
}
void restart_unroot_service(int fd, void *cookie) {
if (getuid() != 0) {
WriteFdExactly(fd, "adbd not running as root\n");
adb_close(fd);
} else {
property_set("service.adb.root", "0");
WriteFdExactly(fd, "restarting adbd as non root\n");
adb_close(fd);
}
}
void restart_tcp_service(int fd, void *cookie) {
int port = (int) (uintptr_t) cookie;
if (port <= 0) {
WriteFdFmt(fd, "invalid port %d\n", port);
adb_close(fd);
return;
}
char value[PROPERTY_VALUE_MAX];
snprintf(value, sizeof(value), "%d", port);
property_set("service.adb.tcp.port", value);
WriteFdFmt(fd, "restarting in TCP mode port: %d\n", port);
adb_close(fd);
}
void restart_usb_service(int fd, void *cookie) {
property_set("service.adb.tcp.port", "0");
WriteFdExactly(fd, "restarting in USB mode\n");
adb_close(fd);
}
static bool reboot_service_impl(int fd, const char* arg) {
const char* reboot_arg = arg;
bool auto_reboot = false;
if (strcmp(reboot_arg, "sideload-auto-reboot") == 0) {
auto_reboot = true;
reboot_arg = "sideload";
}
// It reboots into sideload mode by setting "--sideload" or "--sideload_auto_reboot"
// in the command file.
if (strcmp(reboot_arg, "sideload") == 0) {
if (getuid() != 0) {
WriteFdExactly(fd, "'adb root' is required for 'adb reboot sideload'.\n");
return false;
}
const char* const recovery_dir = "/cache/recovery";
const char* const command_file = "/cache/recovery/command";
// Ensure /cache/recovery exists.
if (adb_mkdir(recovery_dir, 0770) == -1 && errno != EEXIST) {
D("Failed to create directory '%s': %s", recovery_dir, strerror(errno));
return false;
}
bool write_status = android::base::WriteStringToFile(
auto_reboot ? "--sideload_auto_reboot" : "--sideload", command_file);
if (!write_status) {
return false;
}
reboot_arg = "recovery";
}
sync();
char property_val[PROPERTY_VALUE_MAX];
int ret = snprintf(property_val, sizeof(property_val), "reboot,%s", reboot_arg);
if (ret >= static_cast<int>(sizeof(property_val))) {
WriteFdFmt(fd, "reboot string too long: %d\n", ret);
return false;
}
ret = property_set(ANDROID_RB_PROPERTY, property_val);
if (ret < 0) {
WriteFdFmt(fd, "reboot failed: %d\n", ret);
return false;
}
return true;
}
void reboot_service(int fd, void* arg)
{
if (reboot_service_impl(fd, static_cast<const char*>(arg))) {
// Don't return early. Give the reboot command time to take effect
// to avoid messing up scripts which do "adb reboot && adb wait-for-device"
while (true) {
pause();
}
}
free(arg);
adb_close(fd);
}
int reverse_service(const char* command) {
int s[2];
if (adb_socketpair(s)) {
PLOG(ERROR) << "cannot create service socket pair.";
return -1;
}
VLOG(SERVICES) << "service socketpair: " << s[0] << ", " << s[1];
if (handle_forward_request(command, kTransportAny, nullptr, s[1]) < 0) {
SendFail(s[1], "not a reverse forwarding command");
}
adb_close(s[1]);
return s[0];
}
// Shell service string can look like:
// shell[,arg1,arg2,...]:[command]
static int ShellService(const std::string& args, const atransport* transport) {
size_t delimiter_index = args.find(':');
if (delimiter_index == std::string::npos) {
LOG(ERROR) << "No ':' found in shell service arguments: " << args;
return -1;
}
const std::string service_args = args.substr(0, delimiter_index);
const std::string command = args.substr(delimiter_index + 1);
// Defaults:
// PTY for interactive, raw for non-interactive.
// No protocol.
// $TERM set to "dumb".
SubprocessType type(command.empty() ? SubprocessType::kPty
: SubprocessType::kRaw);
SubprocessProtocol protocol = SubprocessProtocol::kNone;
std::string terminal_type = "dumb";
for (const std::string& arg : android::base::Split(service_args, ",")) {
if (arg == kShellServiceArgRaw) {
type = SubprocessType::kRaw;
} else if (arg == kShellServiceArgPty) {
type = SubprocessType::kPty;
} else if (arg == kShellServiceArgShellProtocol) {
protocol = SubprocessProtocol::kShell;
} else if (android::base::StartsWith(arg, "TERM=")) {
terminal_type = arg.substr(5);
} else if (!arg.empty()) {
// This is not an error to allow for future expansion.
LOG(WARNING) << "Ignoring unknown shell service argument: " << arg;
}
}
return StartSubprocess(command.c_str(), terminal_type.c_str(), type, protocol);
}
#endif // !ADB_HOST
static int create_service_thread(void (*func)(int, void *), void *cookie)
{
int s[2];
if (adb_socketpair(s)) {
printf("cannot create service socket pair\n");
return -1;
}
D("socketpair: (%d,%d)", s[0], s[1]);
stinfo* sti = reinterpret_cast<stinfo*>(malloc(sizeof(stinfo)));
if (sti == nullptr) {
fatal("cannot allocate stinfo");
}
sti->func = func;
sti->cookie = cookie;
sti->fd = s[1];
if (!adb_thread_create(service_bootstrap_func, sti)) {
free(sti);
adb_close(s[0]);
adb_close(s[1]);
printf("cannot create service thread\n");
return -1;
}
D("service thread started, %d:%d",s[0], s[1]);
return s[0];
}
int service_to_fd(const char* name, const atransport* transport) {
int ret = -1;
if(!strncmp(name, "tcp:", 4)) {
int port = atoi(name + 4);
name = strchr(name + 4, ':');
if(name == 0) {
std::string error;
ret = network_loopback_client(port, SOCK_STREAM, &error);
if (ret >= 0)
disable_tcp_nagle(ret);
} else {
#if ADB_HOST
std::string error;
ret = network_connect(name + 1, port, SOCK_STREAM, 0, &error);
#else
return -1;
#endif
}
#if !defined(_WIN32) /* winsock doesn't implement unix domain sockets */
} else if(!strncmp(name, "local:", 6)) {
ret = socket_local_client(name + 6,
ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
} else if(!strncmp(name, "localreserved:", 14)) {
ret = socket_local_client(name + 14,
ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM);
} else if(!strncmp(name, "localabstract:", 14)) {
ret = socket_local_client(name + 14,
ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
} else if(!strncmp(name, "localfilesystem:", 16)) {
ret = socket_local_client(name + 16,
ANDROID_SOCKET_NAMESPACE_FILESYSTEM, SOCK_STREAM);
#endif
#if !ADB_HOST
} else if(!strncmp("dev:", name, 4)) {
ret = unix_open(name + 4, O_RDWR | O_CLOEXEC);
} else if(!strncmp(name, "framebuffer:", 12)) {
ret = create_service_thread(framebuffer_service, 0);
} else if (!strncmp(name, "jdwp:", 5)) {
ret = create_jdwp_connection_fd(atoi(name+5));
} else if(!strncmp(name, "shell", 5)) {
ret = ShellService(name + 5, transport);
} else if(!strncmp(name, "exec:", 5)) {
ret = StartSubprocess(name + 5, nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
} else if(!strncmp(name, "sync:", 5)) {
ret = create_service_thread(file_sync_service, NULL);
} else if(!strncmp(name, "remount:", 8)) {
ret = create_service_thread(remount_service, NULL);
} else if(!strncmp(name, "reboot:", 7)) {
void* arg = strdup(name + 7);
if (arg == NULL) return -1;
ret = create_service_thread(reboot_service, arg);
} else if(!strncmp(name, "root:", 5)) {
ret = create_service_thread(restart_root_service, NULL);
} else if(!strncmp(name, "unroot:", 7)) {
ret = create_service_thread(restart_unroot_service, NULL);
} else if(!strncmp(name, "backup:", 7)) {
ret = StartSubprocess(android::base::StringPrintf("/system/bin/bu backup %s",
(name + 7)).c_str(),
nullptr, SubprocessType::kRaw, SubprocessProtocol::kNone);
} else if(!strncmp(name, "restore:", 8)) {
ret = StartSubprocess("/system/bin/bu restore", nullptr, SubprocessType::kRaw,
SubprocessProtocol::kNone);
} else if(!strncmp(name, "tcpip:", 6)) {
int port;
if (sscanf(name + 6, "%d", &port) != 1) {
return -1;
}
ret = create_service_thread(restart_tcp_service, (void *) (uintptr_t) port);
} else if(!strncmp(name, "usb:", 4)) {
ret = create_service_thread(restart_usb_service, NULL);
} else if (!strncmp(name, "reverse:", 8)) {
ret = reverse_service(name + 8);
} else if(!strncmp(name, "disable-verity:", 15)) {
ret = create_service_thread(set_verity_enabled_state_service, (void*)0);
} else if(!strncmp(name, "enable-verity:", 15)) {
ret = create_service_thread(set_verity_enabled_state_service, (void*)1);
#endif
}
if (ret >= 0) {
close_on_exec(ret);
}
return ret;
}
#if ADB_HOST
struct state_info {
TransportType transport_type;
char* serial;
ConnectionState state;
};
static void wait_for_state(int fd, void* cookie) {
state_info* sinfo = reinterpret_cast<state_info*>(cookie);
D("wait_for_state %d", sinfo->state);
while (true) {
bool is_ambiguous = false;
std::string error = "unknown error";
atransport* t = acquire_one_transport(sinfo->transport_type, sinfo->serial,
&is_ambiguous, &error);
if (t != nullptr && t->connection_state == sinfo->state) {
SendOkay(fd);
break;
} else if (!is_ambiguous) {
adb_sleep_ms(1000);
// Try again...
} else {
SendFail(fd, error);
break;
}
}
if (sinfo->serial) {
free(sinfo->serial);
}
free(sinfo);
adb_close(fd);
D("wait_for_state is done");
}
static void connect_device(const std::string& address, std::string* response) {
if (address.empty()) {
*response = "empty address";
return;
}
std::string serial;
std::string host;
int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
if (!parse_host_and_port(address, &serial, &host, &port, response)) {
return;
}
std::string error;
int fd = network_connect(host.c_str(), port, SOCK_STREAM, 10, &error);
if (fd == -1) {
*response = android::base::StringPrintf("unable to connect to %s: %s",
serial.c_str(), error.c_str());
return;
}
D("client: connected %s remote on fd %d", serial.c_str(), fd);
close_on_exec(fd);
disable_tcp_nagle(fd);
int ret = register_socket_transport(fd, serial.c_str(), port, 0);
if (ret < 0) {
adb_close(fd);
*response = android::base::StringPrintf("already connected to %s", serial.c_str());
} else {
*response = android::base::StringPrintf("connected to %s", serial.c_str());
}
}
void connect_emulator(const std::string& port_spec, std::string* response) {
std::vector<std::string> pieces = android::base::Split(port_spec, ",");
if (pieces.size() != 2) {
*response = android::base::StringPrintf("unable to parse '%s' as <console port>,<adb port>",
port_spec.c_str());
return;
}
int console_port = strtol(pieces[0].c_str(), NULL, 0);
int adb_port = strtol(pieces[1].c_str(), NULL, 0);
if (console_port <= 0 || adb_port <= 0) {
*response = android::base::StringPrintf("Invalid port numbers: %s", port_spec.c_str());
return;
}
// Check if the emulator is already known.
// Note: There's a small but harmless race condition here: An emulator not
// present just yet could be registered by another invocation right
// after doing this check here. However, local_connect protects
// against double-registration too. From here, a better error message
// can be produced. In the case of the race condition, the very specific
// error message won't be shown, but the data doesn't get corrupted.
atransport* known_emulator = find_emulator_transport_by_adb_port(adb_port);
if (known_emulator != nullptr) {
*response = android::base::StringPrintf("Emulator already registered on port %d", adb_port);
return;
}
// Check if more emulators can be registered. Similar unproblematic
// race condition as above.
int candidate_slot = get_available_local_transport_index();
if (candidate_slot < 0) {
*response = "Cannot accept more emulators";
return;
}
// Preconditions met, try to connect to the emulator.
std::string error;
if (!local_connect_arbitrary_ports(console_port, adb_port, &error)) {
*response = android::base::StringPrintf("Connected to emulator on ports %d,%d",
console_port, adb_port);
} else {
*response = android::base::StringPrintf("Could not connect to emulator on ports %d,%d: %s",
console_port, adb_port, error.c_str());
}
}
static void connect_service(int fd, void* data) {
char* host = reinterpret_cast<char*>(data);
std::string response;
if (!strncmp(host, "emu:", 4)) {
connect_emulator(host + 4, &response);
} else {
connect_device(host, &response);
}
free(host);
// Send response for emulator and device
SendProtocolString(fd, response);
adb_close(fd);
}
#endif
#if ADB_HOST
asocket* host_service_to_socket(const char* name, const char* serial) {
if (!strcmp(name,"track-devices")) {
return create_device_tracker();
} else if (!strncmp(name, "wait-for-", strlen("wait-for-"))) {
auto sinfo = reinterpret_cast<state_info*>(malloc(sizeof(state_info)));
if (sinfo == nullptr) {
fprintf(stderr, "couldn't allocate state_info: %s", strerror(errno));
return NULL;
}
if (serial)
sinfo->serial = strdup(serial);
else
sinfo->serial = NULL;
name += strlen("wait-for-");
if (!strncmp(name, "local", strlen("local"))) {
sinfo->transport_type = kTransportLocal;
sinfo->state = kCsDevice;
} else if (!strncmp(name, "usb", strlen("usb"))) {
sinfo->transport_type = kTransportUsb;
sinfo->state = kCsDevice;
} else if (!strncmp(name, "any", strlen("any"))) {
sinfo->transport_type = kTransportAny;
sinfo->state = kCsDevice;
} else {
if (sinfo->serial) {
free(sinfo->serial);
}
free(sinfo);
return NULL;
}
int fd = create_service_thread(wait_for_state, sinfo);
return create_local_socket(fd);
} else if (!strncmp(name, "connect:", 8)) {
char* host = strdup(name + 8);
int fd = create_service_thread(connect_service, host);
return create_local_socket(fd);
}
return NULL;
}
#endif /* ADB_HOST */
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