adb/services.cpp - platform/system/core - Gitiles

 /*
  * 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>

 #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>

 #if !ADB_HOST
 #include "cutils/android_reboot.h"
 #include "cutils/properties.h"
 #endif

 #include "adb.h"
 #include "adb_io.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;
 };


 void *service_bootstrap_func(void *x)
 {
     stinfo* sti = reinterpret_cast<stinfo*>(x);
     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)", 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];

     adb_thread_t t;
     if (adb_thread_create(&t, 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");
     }
 }

 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);
 #if defined(_WIN32)
     fprintf(stderr, "error: create_subproc_pty not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
     return -1;
 #else
     int ptm;

     ptm = unix_open("/dev/ptmx", O_RDWR | O_CLOEXEC); // | O_NOCTTY);
     if(ptm < 0){
         printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
         return -1;
     }

     char devname[64];
     if(grantpt(ptm) || unlockpt(ptm) || ptsname_r(ptm, devname, sizeof(devname)) != 0) {
         printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
         adb_close(ptm);
         return -1;
     }

     *pid = fork();
     if(*pid < 0) {
         printf("- fork failed: %s -\n", strerror(errno));
         adb_close(ptm);
         return -1;
     }

     if (*pid == 0) {
         init_subproc_child();

         int pts = unix_open(devname, O_RDWR | O_CLOEXEC);
         if (pts < 0) {
             fprintf(stderr, "child failed to open pseudo-term slave: %s\n", devname);
             exit(-1);
         }

         dup2(pts, STDIN_FILENO);
         dup2(pts, STDOUT_FILENO);
         dup2(pts, STDERR_FILENO);

         adb_close(pts);
         adb_close(ptm);

         execl(cmd, cmd, arg0, arg1, NULL);
         fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
                 cmd, strerror(errno), errno);
         exit(-1);
     } else {
         return ptm;
     }
 #endif /* !defined(_WIN32) */
 }

 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)", 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);
     }
 }

 static int create_subproc_thread(const char *name, const subproc_mode mode)
 {
     adb_thread_t t;
     int ret_fd;
     pid_t pid = -1;

     const char *arg0, *arg1;
     if (name == 0 || *name == 0) {
         arg0 = "-"; arg1 = 0;
     } else {
         arg0 = "-c"; arg1 = name;
     }

     switch (mode) {
     case SUBPROC_PTY:
         ret_fd = create_subproc_pty(SHELL_COMMAND, arg0, arg1, &pid);
         break;
     case SUBPROC_RAW:
         ret_fd = create_subproc_raw(SHELL_COMMAND, arg0, arg1, &pid);
         break;
     default:
         fprintf(stderr, "invalid subproc_mode %d\n", mode);
         return -1;
     }
     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(&t, 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) {
             ret = socket_loopback_client(port, SOCK_STREAM);
             if (ret >= 0)
                 disable_tcp_nagle(ret);
         } else {
 #if ADB_HOST
             ret = socket_network_client(name + 1, port, SOCK_STREAM);
 #else
             return -1;
 #endif
         }
 #ifndef HAVE_WINSOCK   /* 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(!HOST && !strncmp(name, "shell:", 6)) {
         ret = create_subproc_thread(name + 6, SUBPROC_PTY);
     } else if(!HOST && !strncmp(name, "exec:", 5)) {
         ret = create_subproc_thread(name + 5, SUBPROC_RAW);
     } 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(), SUBPROC_RAW);
     } else if(!strncmp(name, "restore:", 8)) {
         ret = create_subproc_thread("/system/bin/bu restore", SUBPROC_RAW);
     } else if(!strncmp(name, "tcpip:", 6)) {
         int port;
         if (sscanf(name + 6, "%d", &port) != 1) {
             port = 0;
         }
         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 {
     transport_type transport;
     char* serial;
     int 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, sinfo->serial, &error_msg);
     if (t != 0) {
         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& host, std::string* response) {
     if (host.empty()) {
         *response = "empty host name";
         return;
     }

     std::vector<std::string> pieces = android::base::Split(host, ":");
     const std::string& hostname = pieces[0];

     int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
     if (pieces.size() > 1) {
         if (sscanf(pieces[1].c_str(), "%d", &port) != 1) {
             *response = android::base::StringPrintf("bad port number %s", pieces[1].c_str());
             return;
         }
     }

     // This may look like we're putting 'host' back together,
     // but we're actually inserting the default port if necessary.
     std::string serial = android::base::StringPrintf("%s:%d", hostname.c_str(), port);

     int fd = socket_network_client_timeout(hostname.c_str(), port, SOCK_STREAM, 10);
     if (fd < 0) {
         *response = android::base::StringPrintf("unable to connect to %s:%d",
                                                 hostname.c_str(), port);
         return;
     }

     D("client: connected on remote on fd %d\n", 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.
     if (!local_connect_arbitrary_ports(console_port, adb_port)) {
         *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",
                                                 console_port, adb_port);
     }
 }

 static void connect_service(int fd, void* cookie)
 {
     char *host = reinterpret_cast<char*>(cookie);

     std::string response;
     if (!strncmp(host, "emu:", 4)) {
         connect_emulator(host + 4, &response);
     } else {
         connect_device(host, &response);
     }

     // 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 = kTransportLocal;
             sinfo->state = CS_DEVICE;
         } else if (!strncmp(name, "usb", strlen("usb"))) {
             sinfo->transport = kTransportUsb;
             sinfo->state = CS_DEVICE;
         } else if (!strncmp(name, "any", strlen("any"))) {
             sinfo->transport = kTransportAny;
             sinfo->state = CS_DEVICE;
         } else {
             free(sinfo);
             return NULL;
         }

         int fd = create_service_thread(wait_for_state, sinfo);
         return create_local_socket(fd);
     } else if (!strncmp(name, "connect:", 8)) {
         const char *host = name + 8;
         int fd = create_service_thread(connect_service, (void *)host);
         return create_local_socket(fd);
     }
     return NULL;
 }
 #endif /* ADB_HOST */
	/*
	* 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>

	#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>

	#if !ADB_HOST
	#include "cutils/android_reboot.h"
	#include "cutils/properties.h"
	#endif

	#include "adb.h"
	#include "adb_io.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;
	};


	void service_bootstrap_func(void x)
	{
	stinfo* sti = reinterpret_cast<stinfo*>(x);
	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)", 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];

	adb_thread_t t;
	if (adb_thread_create(&t, 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");
	}
	}

	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);
	#if defined(_WIN32)
	fprintf(stderr, "error: create_subproc_pty not implemented on Win32 (%s %s %s)\n", cmd, arg0, arg1);
	return -1;
	#else
	int ptm;

	ptm = unix_open("/dev/ptmx", O_RDWR \| O_CLOEXEC); // \| O_NOCTTY);
	if(ptm < 0){
	printf("[ cannot open /dev/ptmx - %s ]\n",strerror(errno));
	return -1;
	}

	char devname[64];
	if(grantpt(ptm) \|\| unlockpt(ptm) \|\| ptsname_r(ptm, devname, sizeof(devname)) != 0) {
	printf("[ trouble with /dev/ptmx - %s ]\n", strerror(errno));
	adb_close(ptm);
	return -1;
	}

	*pid = fork();
	if(*pid < 0) {
	printf("- fork failed: %s -\n", strerror(errno));
	adb_close(ptm);
	return -1;
	}

	if (*pid == 0) {
	init_subproc_child();

	int pts = unix_open(devname, O_RDWR \| O_CLOEXEC);
	if (pts < 0) {
	fprintf(stderr, "child failed to open pseudo-term slave: %s\n", devname);
	exit(-1);
	}

	dup2(pts, STDIN_FILENO);
	dup2(pts, STDOUT_FILENO);
	dup2(pts, STDERR_FILENO);

	adb_close(pts);
	adb_close(ptm);

	execl(cmd, cmd, arg0, arg1, NULL);
	fprintf(stderr, "- exec '%s' failed: %s (%d) -\n",
	cmd, strerror(errno), errno);
	exit(-1);
	} else {
	return ptm;
	}
	#endif /* !defined(_WIN32) */
	}

	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)", 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);
	}
	}

	static int create_subproc_thread(const char *name, const subproc_mode mode)
	{
	adb_thread_t t;
	int ret_fd;
	pid_t pid = -1;

	const char arg0, arg1;
	if (name == 0 \|\| *name == 0) {
	arg0 = "-"; arg1 = 0;
	} else {
	arg0 = "-c"; arg1 = name;
	}

	switch (mode) {
	case SUBPROC_PTY:
	ret_fd = create_subproc_pty(SHELL_COMMAND, arg0, arg1, &pid);
	break;
	case SUBPROC_RAW:
	ret_fd = create_subproc_raw(SHELL_COMMAND, arg0, arg1, &pid);
	break;
	default:
	fprintf(stderr, "invalid subproc_mode %d\n", mode);
	return -1;
	}
	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(&t, 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) {
	ret = socket_loopback_client(port, SOCK_STREAM);
	if (ret >= 0)
	disable_tcp_nagle(ret);
	} else {
	#if ADB_HOST
	ret = socket_network_client(name + 1, port, SOCK_STREAM);
	#else
	return -1;
	#endif
	}
	#ifndef HAVE_WINSOCK /* 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(!HOST && !strncmp(name, "shell:", 6)) {
	ret = create_subproc_thread(name + 6, SUBPROC_PTY);
	} else if(!HOST && !strncmp(name, "exec:", 5)) {
	ret = create_subproc_thread(name + 5, SUBPROC_RAW);
	} 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(), SUBPROC_RAW);
	} else if(!strncmp(name, "restore:", 8)) {
	ret = create_subproc_thread("/system/bin/bu restore", SUBPROC_RAW);
	} else if(!strncmp(name, "tcpip:", 6)) {
	int port;
	if (sscanf(name + 6, "%d", &port) != 1) {
	port = 0;
	}
	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 {
	transport_type transport;
	char* serial;
	int 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, sinfo->serial, &error_msg);
	if (t != 0) {
	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& host, std::string* response) {
	if (host.empty()) {
	*response = "empty host name";
	return;
	}

	std::vector<std::string> pieces = android::base::Split(host, ":");
	const std::string& hostname = pieces[0];

	int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
	if (pieces.size() > 1) {
	if (sscanf(pieces[1].c_str(), "%d", &port) != 1) {
	*response = android::base::StringPrintf("bad port number %s", pieces[1].c_str());
	return;
	}
	}

	// This may look like we're putting 'host' back together,
	// but we're actually inserting the default port if necessary.
	std::string serial = android::base::StringPrintf("%s:%d", hostname.c_str(), port);

	int fd = socket_network_client_timeout(hostname.c_str(), port, SOCK_STREAM, 10);
	if (fd < 0) {
	*response = android::base::StringPrintf("unable to connect to %s:%d",
	hostname.c_str(), port);
	return;
	}

	D("client: connected on remote on fd %d\n", 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.
	if (!local_connect_arbitrary_ports(console_port, adb_port)) {
	*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",
	console_port, adb_port);
	}
	}

	static void connect_service(int fd, void* cookie)
	{
	char host = reinterpret_cast<char>(cookie);

	std::string response;
	if (!strncmp(host, "emu:", 4)) {
	connect_emulator(host + 4, &response);
	} else {
	connect_device(host, &response);
	}

	// 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 = kTransportLocal;
	sinfo->state = CS_DEVICE;
	} else if (!strncmp(name, "usb", strlen("usb"))) {
	sinfo->transport = kTransportUsb;
	sinfo->state = CS_DEVICE;
	} else if (!strncmp(name, "any", strlen("any"))) {
	sinfo->transport = kTransportAny;
	sinfo->state = CS_DEVICE;
	} else {
	free(sinfo);
	return NULL;
	}

	int fd = create_service_thread(wait_for_state, sinfo);
	return create_local_socket(fd);
	} else if (!strncmp(name, "connect:", 8)) {
	const char *host = name + 8;
	int fd = create_service_thread(connect_service, (void *)host);
	return create_local_socket(fd);
	}
	return NULL;
	}
	#endif /* ADB_HOST */