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platform_system_core
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platform_system_core/adb/services.cpp

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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 TRACE_SERVICES
#include "sysdeps.h"
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if !ADB_HOST
#include <pty.h>
#include <termios.h>
#endif
#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 "transport.h"
struct stinfo {
void (*func)(int fd, void *cookie);
int fd;
void *cookie;
};
enum class SubprocessType {
kPty,
kRaw,
};
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\n", 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);
}
void reverse_service(int fd, void* arg)
{
const char* command = reinterpret_cast<const char*>(arg);
if (handle_forward_request(command, kTransportAny, NULL, fd) < 0) {
SendFail(fd, "not a reverse forwarding command");
}
free(arg);
adb_close(fd);
}
#endif
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)\n", 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\n",s[0], s[1]);
return s[0];
}
#if !ADB_HOST
static void init_subproc_child()
{
setsid();
// Set OOM score adjustment to prevent killing
int fd = adb_open("/proc/self/oom_score_adj", O_WRONLY | O_CLOEXEC);
if (fd >= 0) {
adb_write(fd, "0", 1);
adb_close(fd);
} else {
D("adb: unable to update oom_score_adj\n");
}
}
#if !ADB_HOST
static int create_subproc_pty(const char* cmd, const char* arg0,
const char* arg1, pid_t* pid) {
D("create_subproc_pty(cmd=%s, arg0=%s, arg1=%s)\n", cmd, arg0, arg1);
char pts_name[PATH_MAX];
int ptm;
*pid = forkpty(&ptm, pts_name, nullptr, nullptr);
if (*pid == -1) {
printf("- fork failed: %s -\n", strerror(errno));
unix_close(ptm);
return -1;
}
if (*pid == 0) {
init_subproc_child();
int pts = unix_open(pts_name, O_RDWR | O_CLOEXEC);
if (pts == -1) {
fprintf(stderr, "child failed to open pseudo-term slave %s: %s\n",
pts_name, strerror(errno));
unix_close(ptm);
exit(-1);
}
// arg0 is "-c" in batch mode and "-" in interactive mode.
if (strcmp(arg0, "-c") == 0) {
termios tattr;
if (tcgetattr(pts, &tattr) == -1) {
fprintf(stderr, "tcgetattr failed: %s\n", strerror(errno));
unix_close(pts);
unix_close(ptm);
exit(-1);
}
cfmakeraw(&tattr);
if (tcsetattr(pts, TCSADRAIN, &tattr) == -1) {
fprintf(stderr, "tcsetattr failed: %s\n", strerror(errno));
unix_close(pts);
unix_close(ptm);
exit(-1);
}
}
dup2(pts, STDIN_FILENO);
dup2(pts, STDOUT_FILENO);
dup2(pts, STDERR_FILENO);
unix_close(pts);
unix_close(ptm);
execl(cmd, cmd, arg0, arg1, nullptr);
fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
cmd, strerror(errno), errno);
exit(-1);
} else {
return ptm;
}
}
#endif // !ADB_HOST
static int create_subproc_raw(const char *cmd, const char *arg0, const char *arg1, pid_t *pid)
{
D("create_subproc_raw(cmd=%s, arg0=%s, arg1=%s)\n", cmd, arg0, arg1);
#if defined(_WIN32)
fprintf(stderr, "error: create_subproc_raw not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
return -1;
#else
// 0 is parent socket, 1 is child socket
int sv[2];
if (adb_socketpair(sv) < 0) {
printf("[ cannot create socket pair - %s ]\n", strerror(errno));
return -1;
}
D("socketpair: (%d,%d)\n", sv[0], sv[1]);
*pid = fork();
if (*pid < 0) {
printf("- fork failed: %s -\n", strerror(errno));
adb_close(sv[0]);
adb_close(sv[1]);
return -1;
}
if (*pid == 0) {
adb_close(sv[0]);
init_subproc_child();
dup2(sv[1], STDIN_FILENO);
dup2(sv[1], STDOUT_FILENO);
dup2(sv[1], STDERR_FILENO);
adb_close(sv[1]);
execl(cmd, cmd, arg0, arg1, NULL);
fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
cmd, strerror(errno), errno);
exit(-1);
} else {
adb_close(sv[1]);
return sv[0];
}
#endif /* !defined(_WIN32) */
}
#endif /* !ABD_HOST */
#if ADB_HOST
#define SHELL_COMMAND "/bin/sh"
#else
#define SHELL_COMMAND "/system/bin/sh"
#endif
#if !ADB_HOST
static void subproc_waiter_service(int fd, void *cookie)
{
pid_t pid = (pid_t) (uintptr_t) cookie;
D("entered. fd=%d of pid=%d\n", fd, pid);
while (true) {
int status;
pid_t p = waitpid(pid, &status, 0);
if (p == pid) {
D("fd=%d, post waitpid(pid=%d) status=%04x\n", fd, p, status);
if (WIFSIGNALED(status)) {
D("*** Killed by signal %d\n", WTERMSIG(status));
break;
} else if (!WIFEXITED(status)) {
D("*** Didn't exit!!. status %d\n", status);
break;
} else if (WEXITSTATUS(status) >= 0) {
D("*** Exit code %d\n", WEXITSTATUS(status));
break;
}
}
}
D("shell exited fd=%d of pid=%d err=%d\n", fd, pid, errno);
if (SHELL_EXIT_NOTIFY_FD >=0) {
int res;
res = WriteFdExactly(SHELL_EXIT_NOTIFY_FD, &fd, sizeof(fd)) ? 0 : -1;
D("notified shell exit via fd=%d for pid=%d res=%d errno=%d\n",
SHELL_EXIT_NOTIFY_FD, pid, res, errno);
}
}
// Starts a subprocess and spawns a thread to wait for the subprocess to finish
// and trigger the necessary cleanup.
//
// |name| is the command to execute in the subprocess; empty string will start
// an interactive session.
// |type| selects between a PTY or raw subprocess.
//
// Returns an open file descriptor tied to the subprocess stdin/stdout/stderr.
static int create_subproc_thread(const char *name, SubprocessType type) {
const char *arg0, *arg1;
if (*name == '\0') {
arg0 = "-";
arg1 = nullptr;
} else {
arg0 = "-c";
arg1 = name;
}
pid_t pid = -1;
int ret_fd;
if (type == SubprocessType::kPty) {
ret_fd = create_subproc_pty(SHELL_COMMAND, arg0, arg1, &pid);
} else {
ret_fd = create_subproc_raw(SHELL_COMMAND, arg0, arg1, &pid);
}
D("create_subproc ret_fd=%d pid=%d\n", ret_fd, pid);
stinfo* sti = reinterpret_cast<stinfo*>(malloc(sizeof(stinfo)));
if(sti == 0) fatal("cannot allocate stinfo");
sti->func = subproc_waiter_service;
sti->cookie = (void*) (uintptr_t) pid;
sti->fd = ret_fd;
if (!adb_thread_create(service_bootstrap_func, sti)) {
free(sti);
adb_close(ret_fd);
fprintf(stderr, "cannot create service thread\n");
return -1;
}
D("service thread started, fd=%d pid=%d\n", ret_fd, pid);
return ret_fd;
}
#endif
int service_to_fd(const char* name) {
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:", 6)) {
const char* args = name + 6;
if (*args) {
// Non-interactive session uses a raw subprocess.
ret = create_subproc_thread(args, SubprocessType::kRaw);
} else {
// Interactive session uses a PTY subprocess.
ret = create_subproc_thread(args, SubprocessType::kPty);
}
} else if(!strncmp(name, "exec:", 5)) {
ret = create_subproc_thread(name + 5, SubprocessType::kRaw);
} 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 = create_subproc_thread(android::base::StringPrintf("/system/bin/bu backup %s",
(name + 7)).c_str(),
SubprocessType::kRaw);
} else if(!strncmp(name, "restore:", 8)) {
ret = create_subproc_thread("/system/bin/bu restore", SubprocessType::kRaw);
} 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)) {
char* cookie = strdup(name + 8);
if (cookie == NULL) {
ret = -1;
} else {
ret = create_service_thread(reverse_service, cookie);
if (ret < 0) {
free(cookie);
}
}
} 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\n", sinfo->state);
std::string error_msg = "unknown error";
atransport* t = acquire_one_transport(sinfo->state, sinfo->transport_type, sinfo->serial,
&error_msg);
if (t != nullptr) {
SendOkay(fd);
} else {
SendFail(fd, error_msg);
}
if (sinfo->serial)
free(sinfo->serial);
free(sinfo);
adb_close(fd);
D("wait_for_state is done\n");
}
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\n", 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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