原文出处:http://blog.csdn.net/viewsky11/article/details/53889143
作者:viewsky11
转载:关于adb的原理,流程,代码,编译分析的透彻
在adb中有三个模块,分别是adbd,adb server,adb client,如下表所示:
module name | process name | run as | adbdadbddevice/emulatoradb serverwindows: adb.exe linux: adbclientadb clientsuch as eclipse, screencast,ddm app…and so onclientadb server需要连接到adbd,这个连接叫adbconnect,这时候就可以通过客户端与设备端进行沟通,如下图:
具体的沟通交流层次如下图所示:
adbd是运行在设备端的一个守护进程,具体代码在adb.c中:
int main(int argc, char **argv){#if ADB_HOST adb_sysdeps_init(); adb_trace_init(); D("Handling commandline()\n"); return adb_commandline(argc - 1, argv + 1);#else adb_qemu_trace_init(); if((argc > 1) && (!strcmp(argv[1],"recovery"))) { adb_device_banner = "recovery"; recovery_mode = 1; } start_device_log(); D("Handling main()\n"); return adb_main(0, DEFAULT_ADB_PORT); #endif}
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其中adb_main
函数是adbd进程的入口,执行“sevice adbd”时从这里开始调用。
在adbd中将会创建一对socket,一个用来控制连接,一个用来连接到adb client,adbd将会接收和发送信息与应用层的程序进行交流,如图所示:
数据结构
struct fdevent { fdevent *next; fdevent *prev; int fd; int force_eof; unsigned short state; unsigned short events; fd_func func; void *arg;};
adb server将会扫描设备的5555到5585的奇数端口号,install_listener将会实施交互监听,如图所示:
adb server和adb client将会通过socket与设备端进行交流,端口号为5037,如下图:
adb使用PC机可以通过USB或网络与android设备通讯。
adb的源码位于system/core/adb目录下,先来看下编译脚本Android.mk:
# Copyright 2005 The Android Open Source Project## Android.mk for adb#LOCAL_PATH:= $(call my-dir)# adb host tool# =========================================================include $(CLEAR_VARS)# Default to a virtual (sockets) usb interfaceUSB_SRCS :=EXTRA_SRCS :=ifeq ($(HOST_OS),linux) USB_SRCS := usb_linux.c EXTRA_SRCS := get_my_path_linux.c LOCAL_LDLIBS += -lrt -ldl -lpthread LOCAL_CFLAGS += -DWORKAROUND_BUG6558362endififeq ($(HOST_OS),darwin) USB_SRCS := usb_osx.c EXTRA_SRCS := get_my_path_darwin.c LOCAL_LDLIBS += -lpthread -framework CoreFoundation -framework IOKit -framework Carbonendififeq ($(HOST_OS),freebsd) USB_SRCS := usb_libusb.c EXTRA_SRCS := get_my_path_freebsd.c LOCAL_LDLIBS += -lpthread -lusbendififeq ($(HOST_OS),windows) USB_SRCS := usb_windows.c EXTRA_SRCS := get_my_path_windows.c ../libcutils/list.c EXTRA_STATIC_LIBS := AdbWinApi ifneq ($(strip $(USE_CYGWIN)),) # Pure cygwin case LOCAL_LDLIBS += -lpthread -lgdi32 LOCAL_C_INCLUDES += /usr/include/w32api/ddk endif ifneq ($(strip $(USE_MINGW)),) # MinGW under Linux case LOCAL_LDLIBS += -lws2_32 -lgdi32 USE_SYSDEPS_WIN32 := 1 LOCAL_C_INCLUDES += /usr/i586-mingw32msvc/include/ddk endif LOCAL_C_INCLUDES += development/host/windows/usb/api/endifLOCAL_SRC_FILES := \ adb.c \ console.c \ transport.c \ transport_local.c \ transport_usb.c \ commandline.c \ adb_client.c \ adb_auth_host.c \ sockets.c \ services.c \ file_sync_client.c \ $(EXTRA_SRCS) \ $(USB_SRCS) \ utils.c \ usb_vendors.cLOCAL_C_INCLUDES += external/openssl/includeifneq ($(USE_SYSDEPS_WIN32),) LOCAL_SRC_FILES += sysdeps_win32.celse LOCAL_SRC_FILES += fdevent.cendifLOCAL_CFLAGS += -O2 -g -DADB_HOST=1 -Wall -Wno-unused-parameterLOCAL_CFLAGS += -D_XOPEN_SOURCE -D_GNU_SOURCELOCAL_MODULE := adbLOCAL_MODULE_TAGS := debugLOCAL_STATIC_LIBRARIES := libzipfile libunz libcrypto_static $(EXTRA_STATIC_LIBS)ifeq ($(USE_SYSDEPS_WIN32),) LOCAL_STATIC_LIBRARIES += libcutilsendifinclude $(BUILD_HOST_EXECUTABLE)$(call dist-for-goals,dist_files sdk,$(LOCAL_BUILT_MODULE))ifeq ($(HOST_OS),windows)$(LOCAL_INSTALLED_MODULE): \ $(HOST_OUT_EXECUTABLES)/AdbWinApi.dll \ $(HOST_OUT_EXECUTABLES)/AdbWinUsbApi.dllendif# adbd device daemon# =========================================================include $(CLEAR_VARS)LOCAL_SRC_FILES := \ adb.c \ backup_service.c \ fdevent.c \ transport.c \ transport_local.c \ transport_usb.c \ adb_auth_client.c \ sockets.c \ services.c \ file_sync_service.c \ jdwp_service.c \ framebuffer_service.c \ remount_service.c \ usb_linux_client.c \ log_service.c \ utils.cLOCAL_CFLAGS := -O2 -g -DADB_HOST=0 -Wall -Wno-unused-parameterLOCAL_CFLAGS += -D_XOPEN_SOURCE -D_GNU_SOURCEifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))LOCAL_CFLAGS += -DALLOW_ADBD_ROOT=1endifLOCAL_MODULE := adbdLOCAL_FORCE_STATIC_EXECUTABLE := trueLOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)LOCAL_STATIC_LIBRARIES := libcutils libc libmincryptinclude $(BUILD_EXECUTABLE)# adb host tool for device-as-host# =========================================================ifneq ($(SDK_ONLY),true)include $(CLEAR_VARS)LOCAL_LDLIBS := -lrt -ldl -lpthreadLOCAL_SRC_FILES := \ adb.c \ console.c \ transport.c \ transport_local.c \ transport_usb.c \ commandline.c \ adb_client.c \ adb_auth_host.c \ sockets.c \ services.c \ file_sync_client.c \ get_my_path_linux.c \ usb_linux.c \ utils.c \ usb_vendors.c \ fdevent.cLOCAL_CFLAGS := \ -O2 \ -g \ -DADB_HOST=1 \ -DADB_HOST_ON_TARGET=1 \ -Wall \ -Wno-unused-parameter \ -D_XOPEN_SOURCE \ -D_GNU_SOURCELOCAL_C_INCLUDES += external/openssl/includeLOCAL_MODULE := adbLOCAL_STATIC_LIBRARIES := libzipfile libunz libcutilsLOCAL_SHARED_LIBRARIES := libcryptoinclude $(BUILD_EXECUTABLE)endif
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通过编译,最终会有3个执行文件被生成,adbd和两个adb程序。
adbd是设备终端的守护进程;
adb一个是windows、linux、darwin或freebsd运行的程序,另一个是目标机上运行的程序。
其中宏ADB_HOST
用于区分是PC端程序还是目标机端的程序。宏ADB_HOST_ON_TARGET
用于区分adb程序是否是在目标机上运行。 这3个程序使用的是同一份源码,在内部,使用这些宏来区别不同的程序。
先来看adbd程序,此时宏的设置是ADB_HOST=0
。在main函数代码中start_device_log()
是log的初始化操作,可以重定向输出的log信息,接着进入adb_main()
函数。
先来看下它的参数DEFAULT_ADB_PORT
:
#if ADB_HOST_ON_TARGET/* adb and adbd are coexisting on the target, so use 5038 for adb * to avoid conflicting with adbd */# define DEFAULT_ADB_PORT 5038#else# define DEFAULT_ADB_PORT 5037#endif
如果是目标机程序,它的值是5038,否则它的值是5037。
这里没有定义ADB_HOST_ON_TARGET
, 所以它是5037。
adb_main()的源代码如下:
int adb_main(int is_daemon, int server_port){#if !ADB_HOST int port; char value[PROPERTY_VALUE_MAX]; umask(000);#endif atexit(adb_cleanup);#ifdef HAVE_WIN32_PROC SetConsoleCtrlHandler( ctrlc_handler, TRUE );#elif defined(HAVE_FORKEXEC) signal(SIGPIPE, SIG_IGN);#endif init_transport_registration();#if ADB_HOST HOST = 1;#ifdef WORKAROUND_BUG6558362 if(is_daemon) adb_set_affinity();#endif usb_vendors_init(); usb_init(); local_init(DEFAULT_ADB_LOCAL_TRANSPORT_PORT); adb_auth_init(); char local_name[30]; build_local_name(local_name, sizeof(local_name), server_port); if(install_listener(local_name, "*smartsocket*", NULL, 0)) { exit(1); }#else property_get("ro.adb.secure", value, "0"); auth_enabled = !strcmp(value, "1"); if (auth_enabled) adb_auth_init(); const char* adb_external_storage = getenv("ADB_EXTERNAL_STORAGE"); if (NULL != adb_external_storage) { setenv("EXTERNAL_STORAGE", adb_external_storage, 1); } else { D("Warning: ADB_EXTERNAL_STORAGE is not set. Leaving EXTERNAL_STORAGE" " unchanged.\n"); } if (should_drop_privileges()) { struct __user_cap_header_struct header; struct __user_cap_data_struct cap[2]; if (prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) != 0) { exit(1); } drop_capabilities_bounding_set_if_needed(); memset(&header, 0, sizeof(header)); memset(cap, 0, sizeof(cap)); header.version = _LINUX_CAPABILITY_VERSION_3; header.pid = 0; cap[CAP_TO_INDEX(CAP_SYS_BOOT)].effective |= CAP_TO_MASK(CAP_SYS_BOOT); cap[CAP_TO_INDEX(CAP_SYS_BOOT)].permitted |= CAP_TO_MASK(CAP_SYS_BOOT); capset(&header, cap); D("Local port disabled\n"); } else { char local_name[30]; build_local_name(local_name, sizeof(local_name), server_port); if(install_listener(local_name, "*smartsocket*", NULL, 0)) { exit(1); } } int usb = 0; if (access(USB_ADB_PATH, F_OK) == 0 || access(USB_FFS_ADB_EP0, F_OK) == 0) { usb_init(); usb = 1; } property_get("service.adb.tcp.port", value, ""); if (!value[0]) { property_get("persist.adb.tcp.port", value, ""); } if (sscanf(value, "%d", &port) == 1 && port > 0) { printf("using port=%d\n", port); local_init(port); } else { local_init(DEFAULT_ADB_LOCAL_TRANSPORT_PORT); } D("adb_main(): pre init_jdwp()\n"); init_jdwp(); D("adb_main(): post init_jdwp()\n");#endif if (is_daemon) { #ifdef HAVE_WIN32_PROC DWORD count; WriteFile( GetStdHandle( STD_OUTPUT_HANDLE ), "OK\n", 3, &count, NULL );#elif defined(HAVE_FORKEXEC) fprintf(stderr, "OK\n");#endif start_logging(); } D("Event loop starting\n"); fdevent_loop(); usb_cleanup(); return 0;}
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再来看adb程序的执行:
在main()
中调用return adb_commandline(argc - 1, argv + 1)
:
int adb_commandline(int argc, char **argv){ char buf[4096]; int no_daemon = 0; int is_daemon = 0; int is_server = 0; int persist = 0; int r; int quote; transport_type ttype = kTransportAny; char* serial = NULL; char* server_port_str = NULL; gProductOutPath = getenv("ANDROID_PRODUCT_OUT"); if (gProductOutPath == NULL || gProductOutPath[0] == '\0') { gProductOutPath = NULL; } serial = getenv("ANDROID_SERIAL"); server_port_str = getenv("ANDROID_ADB_SERVER_PORT"); int server_port = DEFAULT_ADB_PORT; if (server_port_str && strlen(server_port_str) > 0) { server_port = (int) strtol(server_port_str, NULL, 0); if (server_port <= 0 || server_port > 65535) { fprintf(stderr, "adb: Env var ANDROID_ADB_SERVER_PORT must be a positive number less than 65535. Got \"%s\"\n", server_port_str); return usage(); } } while(argc > 0) { if(!strcmp(argv[0],"server")) { is_server = 1; } else if(!strcmp(argv[0],"nodaemon")) { no_daemon = 1; } else if (!strcmp(argv[0], "fork-server")) { is_daemon = 1; } else if(!strcmp(argv[0],"persist")) { persist = 1; } else if(!strncmp(argv[0], "-p", 2)) { const char *product = NULL; if (argv[0][2] == '\0') { if (argc < 2) return usage(); product = argv[1]; argc--; argv++; } else { product = argv[0] + 2; } gProductOutPath = find_product_out_path(product); if (gProductOutPath == NULL) { fprintf(stderr, "adb: could not resolve \"-p %s\"\n", product); return usage(); } } else if (argv[0][0]=='-' && argv[0][1]=='s') { if (isdigit(argv[0][2])) { serial = argv[0] + 2; } else { if(argc < 2 || argv[0][2] != '\0') return usage(); serial = argv[1]; argc--; argv++; } } else if (!strcmp(argv[0],"-d")) { ttype = kTransportUsb; } else if (!strcmp(argv[0],"-e")) { ttype = kTransportLocal; } else if (!strcmp(argv[0],"-a")) { gListenAll = 1; } else if(!strncmp(argv[0], "-H", 2)) { const char *hostname = NULL; if (argv[0][2] == '\0') { if (argc < 2) return usage(); hostname = argv[1]; argc--; argv++; } else { hostname = argv[0] + 2; } adb_set_tcp_name(hostname); } else if(!strncmp(argv[0], "-P", 2)) { if (argv[0][2] == '\0') { if (argc < 2) return usage(); server_port_str = argv[1]; argc--; argv++; } else { server_port_str = argv[0] + 2; } if (strlen(server_port_str) > 0) { server_port = (int) strtol(server_port_str, NULL, 0); if (server_port <= 0 || server_port > 65535) { fprintf(stderr, "adb: port number must be a positive number less than 65536. Got \"%s\"\n", server_port_str); return usage(); } } else { fprintf(stderr, "adb: port number must be a positive number less than 65536. Got empty string.\n"); return usage(); } } else { break; } argc--; argv++; } adb_set_transport(ttype, serial); adb_set_tcp_specifics(server_port); if (is_server) { if (no_daemon || is_daemon) { r = adb_main(is_daemon, server_port); } else { r = launch_server(server_port); } if(r) { fprintf(stderr,"* could not start server *\n"); } return r; }top: if(argc == 0) { return usage(); } if(!strcmp(argv[0], "devices")) { char *tmp; char *listopt; if (argc < 2) listopt = ""; else if (argc == 2 && !strcmp(argv[1], "-l")) listopt = argv[1]; else { fprintf(stderr, "Usage: adb devices [-l]\n"); return 1; } snprintf(buf, sizeof buf, "host:%s%s", argv[0], listopt); tmp = adb_query(buf); if(tmp) { printf("List of devices attached \n"); printf("%s\n", tmp); return 0; } else { return 1; } } if(!strcmp(argv[0], "connect")) { char *tmp; if (argc != 2) { fprintf(stderr, "Usage: adb connect <host>[:<port>]\n"); return 1; } snprintf(buf, sizeof buf, "host:connect:%s", argv[1]); tmp = adb_query(buf); if(tmp) { printf("%s\n", tmp); return 0; } else { return 1; } } if(!strcmp(argv[0], "disconnect")) { char *tmp; if (argc > 2) { fprintf(stderr, "Usage: adb disconnect [<host>[:<port>]]\n"); return 1; } if (argc == 2) { snprintf(buf, sizeof buf, "host:disconnect:%s", argv[1]); } else { snprintf(buf, sizeof buf, "host:disconnect:"); } tmp = adb_query(buf); if(tmp) { printf("%s\n", tmp); return 0; } else { return 1; } } if (!strcmp(argv[0], "emu")) { return adb_send_emulator_command(argc, argv); } if(!strcmp(argv[0], "shell") || !strcmp(argv[0], "hell")) { int r; int fd; char h = (argv[0][0] == 'h'); if (h) { printf("\x1b[41;33m"); fflush(stdout); } if(argc < 2) { D("starting interactive shell\n"); r = interactive_shell(); if (h) { printf("\x1b[0m"); fflush(stdout); } return r; } snprintf(buf, sizeof buf, "shell:%s", argv[1]); argc -= 2; argv += 2; while(argc-- > 0) { strcat(buf, " "); quote = (**argv == 0 || strchr(*argv, ' ')); if (quote) strcat(buf, "\""); strcat(buf, *argv++); if (quote) strcat(buf, "\""); } for(;;) { D("interactive shell loop. buff=%s\n", buf); fd = adb_connect(buf); if(fd >= 0) { D("about to read_and_dump(fd=%d)\n", fd); read_and_dump(fd); D("read_and_dump() done.\n"); adb_close(fd); r = 0; } else { fprintf(stderr,"error: %s\n", adb_error()); r = -1; } if(persist) { fprintf(stderr,"\n- waiting for device -\n"); adb_sleep_ms(1000); do_cmd(ttype, serial, "wait-for-device", 0); } else { if (h) { printf("\x1b[0m"); fflush(stdout); } D("interactive shell loop. return r=%d\n", r); return r; } } } if(!strcmp(argv[0], "kill-server")) { int fd; fd = _adb_connect("host:kill"); if(fd == -1) { fprintf(stderr,"* server not running *\n"); return 1; } return 0; } if(!strcmp(argv[0], "sideload")) { if(argc != 2) return usage(); if(adb_download("sideload", argv[1], 1)) { return 1; } else { return 0; } } if(!strcmp(argv[0], "remount") || !strcmp(argv[0], "reboot") || !strcmp(argv[0], "reboot-bootloader") || !strcmp(argv[0], "tcpip") || !strcmp(argv[0], "usb") || !strcmp(argv[0], "root")) { char command[100]; if (!strcmp(argv[0], "reboot-bootloader")) snprintf(command, sizeof(command), "reboot:bootloader"); else if (argc > 1) snprintf(command, sizeof(command), "%s:%s", argv[0], argv[1]); else snprintf(command, sizeof(command), "%s:", argv[0]); int fd = adb_connect(command); if(fd >= 0) { read_and_dump(fd); adb_close(fd); return 0; } fprintf(stderr,"error: %s\n", adb_error()); return 1; } if(!strcmp(argv[0], "bugreport")) { if (argc != 1) return usage(); do_cmd(ttype, serial, "shell", "bugreport", 0); return 0; } if(!strncmp(argv[0], "wait-for-", strlen("wait-for-"))) { char* service = argv[0]; if (!strncmp(service, "wait-for-device", strlen("wait-for-device"))) { if (ttype == kTransportUsb) { service = "wait-for-usb"; } else if (ttype == kTransportLocal) { service = "wait-for-local"; } else { service = "wait-for-any"; } } format_host_command(buf, sizeof buf, service, ttype, serial); if (adb_command(buf)) { D("failure: %s *\n",adb_error()); fprintf(stderr,"error: %s\n", adb_error()); return 1; } if(argc > 1) { argc--; argv++; goto top; } return 0; } if(!strcmp(argv[0], "forward")) { char host_prefix[64]; char remove = 0; char remove_all = 0; char list = 0; char no_rebind = 0; while (argc > 1 && argv[1][0] == '-') { if (!strcmp(argv[1], "--list")) list = 1; else if (!strcmp(argv[1], "--remove")) remove = 1; else if (!strcmp(argv[1], "--remove-all")) remove_all = 1; else if (!strcmp(argv[1], "--no-rebind")) no_rebind = 1; else { return usage(); } argc--; argv++; } if (list + remove + remove_all + no_rebind > 1) { return usage(); } if (serial) { snprintf(host_prefix, sizeof host_prefix, "host-serial:%s", serial); } else if (ttype == kTransportUsb) { snprintf(host_prefix, sizeof host_prefix, "host-usb"); } else if (ttype == kTransportLocal) { snprintf(host_prefix, sizeof host_prefix, "host-local"); } else { snprintf(host_prefix, sizeof host_prefix, "host"); } if (list) { if (argc != 1) return usage(); snprintf(buf, sizeof buf, "%s:list-forward", host_prefix); char* forwards = adb_query(buf); if (forwards == NULL) { fprintf(stderr, "error: %s\n", adb_error()); return 1; } printf("%s", forwards); free(forwards); return 0; } else if (remove_all) { if (argc != 1) return usage(); snprintf(buf, sizeof buf, "%s:killforward-all", host_prefix); } else if (remove) { if (argc != 2) return usage(); snprintf(buf, sizeof buf, "%s:killforward:%s", host_prefix, argv[1]); } else { if (argc != 3) return usage(); const char* command = no_rebind ? "forward:norebind:" : "forward"; snprintf(buf, sizeof buf, "%s:%s:%s;%s", host_prefix, command, argv[1], argv[2]); } if(adb_command(buf)) { fprintf(stderr,"error: %s\n", adb_error()); return 1; } return 0; } if(!strcmp(argv[0], "ls")) { if(argc != 2) return usage(); return do_sync_ls(argv[1]); } if(!strcmp(argv[0], "push")) { if(argc != 3) return usage(); return do_sync_push(argv[1], argv[2], 0 ); } if(!strcmp(argv[0], "pull")) { if (argc == 2) { return do_sync_pull(argv[1], "."); } else if (argc == 3) { return do_sync_pull(argv[1], argv[2]); } else { return usage(); } } if(!strcmp(argv[0], "install")) { if (argc < 2) return usage(); return install_app(ttype, serial, argc, argv); } if(!strcmp(argv[0], "uninstall")) { if (argc < 2) return usage(); return uninstall_app(ttype, serial, argc, argv); } if(!strcmp(argv[0], "sync")) { char *srcarg, *android_srcpath, *data_srcpath; int listonly = 0; int ret; if(argc < 2) { srcarg = NULL; } else if (argc >= 2 && strcmp(argv[1], "-l") == 0) { listonly = 1; if (argc == 3) { srcarg = argv[2]; } else { srcarg = NULL; } } else if(argc == 2) { srcarg = argv[1]; } else { return usage(); } ret = find_sync_dirs(srcarg, &android_srcpath, &data_srcpath); if(ret != 0) return usage(); if(android_srcpath != NULL) ret = do_sync_sync(android_srcpath, "/system", listonly); if(ret == 0 && data_srcpath != NULL) ret = do_sync_sync(data_srcpath, "/data", listonly); free(android_srcpath); free(data_srcpath); return ret; } if(!strcmp(argv[0],"get-state") || !strcmp(argv[0],"get-serialno") || !strcmp(argv[0],"get-devpath")) { char *tmp; format_host_command(buf, sizeof buf, argv[0], ttype, serial); tmp = adb_query(buf); if(tmp) { printf("%s\n", tmp); return 0; } else { return 1; } } if(!strcmp(argv[0],"status-window")) { status_window(ttype, serial); return 0; } if(!strcmp(argv[0],"logcat") || !strcmp(argv[0],"lolcat") || !strcmp(argv[0],"longcat")) { return logcat(ttype, serial, argc, argv); } if(!strcmp(argv[0],"ppp")) { return ppp(argc, argv); } if (!strcmp(argv[0], "start-server")) { return adb_connect("host:start-server"); } if (!strcmp(argv[0], "backup")) { return backup(argc, argv); } if (!strcmp(argv[0], "restore")) { return restore(argc, argv); } if (!strcmp(argv[0], "jdwp")) { int fd = adb_connect("jdwp"); if (fd >= 0) { read_and_dump(fd); adb_close(fd); return 0; } else { fprintf(stderr, "error: %s\n", adb_error()); return -1; } } if(!strcmp(argv[0], "help") || !strcmp(argv[0], "/?")) { help(); return 0; } if(!strcmp(argv[0], "version")) { version(stdout); return 0; } usage(); return 1;}
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adb_commandline
函数根据命令的参数执行不同的功能。adb程序可能以服务的方式或命令行客户端的方式运行。
使用usb进行调试,则执行usb_init()
,它的代码在usb_linux_client.c
中,如下:
void usb_init(){ if (access(USB_FFS_ADB_EP0, F_OK) == 0) usb_ffs_init(); else usb_adb_init();}
调用usb_adb_init()
:
static void usb_adb_init(){ usb_handle *h; adb_thread_t tid; int fd; h = calloc(1, sizeof(usb_handle)); h->write = usb_adb_write; h->read = usb_adb_read; h->kick = usb_adb_kick; h->fd = -1; adb_cond_init(&h->notify, 0); adb_mutex_init(&h->lock, 0); fd = unix_open("/dev/android_adb_enable", O_RDWR); if (fd < 0) { D("failed to open /dev/android_adb_enable\n"); } else { close_on_exec(fd); } D("[ usb_init - starting thread ]\n"); if(adb_thread_create(&tid, usb_adb_open_thread, h)){ fatal_errno("cannot create usb thread"); }}
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它初始化了usb_handle
,并把它作为参数创建usb_adb_open_thread()
线程。这里不能打开/dev/android_adb_enable
。h->fd
的值会在线程usb_adb_open_thread
中赋值,并把它做为h->write()
, h->read()
, h->kick()
的文件句柄,h->kick()
函数功能是把h->fd
置为-1。
usb_adb_open_thread
的代码如下:
static void *usb_adb_open_thread(void *x){ struct usb_handle *usb = (struct usb_handle *)x; int fd; while (1) { adb_mutex_lock(&usb->lock); while (usb->fd != -1) adb_cond_wait(&usb->notify, &usb->lock); adb_mutex_unlock(&usb->lock); D("[ usb_thread - opening device ]\n"); do { fd = unix_open("/dev/android_adb", O_RDWR); if (fd < 0) { fd = unix_open("/dev/android", O_RDWR); } if (fd < 0) { adb_sleep_ms(1000); } } while (fd < 0); D("[ opening device succeeded ]\n"); close_on_exec(fd); usb->fd = fd; D("[ usb_thread - registering device ]\n"); register_usb_transport(usb, 0, 0, 1); } return 0;}
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这个线程的作用是一进入立即打开/dev/android_adb
或/dev/Android
,如果成功,则调用register_usb_transport()
后再次循环,并阻塞在以下代码处
while(usb->fd != -1) adb_cond_wait(&usb->notify, &usb->lock);
当usb->kick()
调用后fd的值被赋为-1,并发送cond唤醒上面的代码。
adb源码fdevent.c文件中定义了工作时创建、监听和处理读写事件。
static fdevent **fd_table = 0; static int fd_table_max = 0;
the_fdevent
的值等于fd_table[the_fdevent->fd]
static void fdevent_register(fdevent *fde){ if(fde->fd < 0) { FATAL("bogus negative fd (%d)\n", fde->fd); } if(fde->fd >= fd_table_max) { //初始化或自动增长fd_table int oldmax = fd_table_max; if(fde->fd > 32000) { FATAL("bogus huuuuge fd (%d)\n", fde->fd); } if(fd_table_max == 0) { fdevent_init(); fd_table_max = 256; } while(fd_table_max <= fde->fd) { fd_table_max *= 2; } fd_table = realloc(fd_table, sizeof(fdevent*) * fd_table_max); if(fd_table == 0) { FATAL("could not expand fd_table to %d entries\n", fd_table_max); } memset(fd_table + oldmax, 0, sizeof(int) * (fd_table_max - oldmax)); } fd_table[fde->fd] = fde; //将fde添加到fd_table}static void fdevent_unregister(fdevent *fde) //这个函数即将fde从fd_table中删除 { if((fde->fd < 0) || (fde->fd >= fd_table_max)) { FATAL("fd out of range (%d)\n", fde->fd); } if(fd_table[fde->fd] != fde) { FATAL("fd_table out of sync [%d]\n", fde->fd); } fd_table[fde->fd] = 0; if(!(fde->state & FDE_DONT_CLOSE)) { //如果fde->fd打开了并没有关闭,需要执行关闭操作 dump_fde(fde, "close"); adb_close(fde->fd); }}
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其中fdevent是代码处理事件的载体,结构体定义如下
struct fdevent { fdevent *next; fdevent *prev; int fd; int force_eof; unsigned short state; unsigned short events; fd_func func; void *arg; };
其中事件可以是:
#define FDE_READ 0x0001#define FDE_WRITE 0x0002#define FDE_ERROR 0x0004#define FDE_TIMEOUT 0x0008#define FDE_DONT_CLOSE 0x0080
状态可以是:
#define FDE_ACTIVE 0x0100#define FDE_PENDING 0x0200#define FDE_CREATED 0x0400
时间和状态的掩码分别为:
#define FDE_EVENTMASK 0x00ff#define FDE_STATEMASK 0xff00
注意,这些状态是可以同时存在的。
当调用fdevent_create()
后,FDE_CREATED
标志被设置,当调用fdevent_install()
后, FDE_CREATED
标志被设置,但在fdevent_create()
内部调用了fdevent_install()
,所以调用fdevent_create()
都被设置了。
当有事件在调用select发生后,相应的事件state会设置为FDE_PENDING
,当事件处理完后这个标志又被删除。相应的代码是:
void fdevent_loop(){ fdevent *fde; fdevent_subproc_setup(); for(;;) { D("--- ---- waiting for events\n"); fdevent_process(); while((fde = fdevent_plist_dequeue())) { fdevent_call_fdfunc(fde); } }}
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其中list_pending
的相关代码:
static fdevent list_pending = { .next = &list_pending, .prev = &list_pending,};static void fdevent_plist_enqueue(fdevent *node){ fdevent *list = &list_pending; node->next = list; node->prev = list->prev; node->prev->next = node; list->prev = node;}static void fdevent_plist_remove(fdevent *node){ node->prev->next = node->next; node->next->prev = node->prev; node->next = 0; node->prev = 0;}static fdevent *fdevent_plist_dequeue(void){ fdevent *list = &list_pending; fdevent *node = list->next; if(node == list) return 0; list->next = node->next; list->next->prev = list; node->next = 0; node->prev = 0; return node;}
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事件的处理是阻塞方式的,可以有两种代码实现方法。定义宏CRAPTASTIC
表示使用epoll的方式,否则使用select方式。这里只列举select的处理方式:
static fd_set read_fds; static fd_set write_fds; static fd_set error_fds; static int select_n = 0; static void fdevent_init(void) { FD_ZERO(&read_fds); FD_ZERO(&write_fds); FD_ZERO(&error_fds); } static void fdevent_connect(fdevent *fde) { if(fde->fd >= select_n) { select_n = fde->fd + 1; } } static void fdevent_disconnect(fdevent *fde) { int i, n; FD_CLR(fde->fd, &read_fds); FD_CLR(fde->fd, &write_fds); FD_CLR(fde->fd, &error_fds); for(n = 0, i = 0; i < select_n; i++) { if(fd_table[i] != 0) n = i; } select_n = n + 1; } static void fdevent_update(fdevent *fde, unsigned events){ if(events & FDE_READ) { FD_SET(fde->fd, &read_fds); } else { FD_CLR(fde->fd, &read_fds); } if(events & FDE_WRITE) { FD_SET(fde->fd, &write_fds); } else { FD_CLR(fde->fd, &write_fds); } if(events & FDE_ERROR) { FD_SET(fde->fd, &error_fds); } else { FD_CLR(fde->fd, &error_fds); } fde->state = (fde->state & FDE_STATEMASK) | events; } static int fdevent_fd_check(fd_set *fds) { int i, n = 0; fdevent *fde; for(i = 0; i < select_n; i++) { fde = fd_table[i]; if(fde == 0) continue; if(fcntl(i, F_GETFL, NULL) < 0) { FD_SET(i, fds); n++; } } return n; }
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transport的原理是使用了fevent机制进行数据传输,atransport结构体的定义如下
struct atransport{ atransport *next; atransport *prev; int (*read_from_remote)(apacket *p, atransport *t); int (*write_to_remote)(apacket *p, atransport *t); void (*close)(atransport *t); void (*kick)(atransport *t); int fd; int transport_socket; fdevent transport_fde; int ref_count; unsigned sync_token; int connection_state; int online; transport_type type; /* usb handle or socket fd as needed */ usb_handle *usb; int sfd; /* used to identify transports for clients */ char *serial; char *product; char *model; char *device; char *devpath; int adb_port; // Use for emulators (local transport) /* a list of adisconnect callbacks called when the transport is kicked */ int kicked; adisconnect disconnects; void *key; unsigned char token[TOKEN_SIZE]; fdevent auth_fde; unsigned failed_auth_attempts;};
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它是一个双向链表,所有的实体都保存在全局数据transport_list
中:
static atransport transport_list = { .next = &transport_list, .prev = &transport_list,}
atransport的数据传输的两个函数是:
static intread_packet(int fd, const char* name, apacket** ppacket){ char *p = (char*)ppacket; int r; int len = sizeof(*ppacket); char buff[8]; if (!name) { snprintf(buff, sizeof buff, "fd=%d", fd); name = buff; } while(len > 0) { r = adb_read(fd, p, len); if(r > 0) { len -= r; p += r; } else { D("%s: read_packet (fd=%d), error ret=%d errno=%d: %s\n", name, fd, r, errno, strerror(errno)); if((r < 0) && (errno == EINTR)) continue; return -1; } }#if ADB_TRACE if (ADB_TRACING) { dump_packet(name, "from remote", *ppacket); }#endif return 0;}static intwrite_packet(int fd, const char* name, apacket** ppacket){ char *p = (char*) ppacket; int r, len = sizeof(ppacket); char buff[8]; if (!name) { snprintf(buff, sizeof buff, "fd=%d", fd); name = buff; }#if ADB_TRACE if (ADB_TRACING) { dump_packet(name, "to remote", *ppacket); }#endif len = sizeof(ppacket); while(len > 0) { r = adb_write(fd, p, len); if(r > 0) { len -= r; p += r; } else { D("%s: write_packet (fd=%d) error ret=%d errno=%d: %s\n", name, fd, r, errno, strerror(errno)); if((r < 0) && (errno == EINTR)) continue; return -1; } } return 0;}
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这是它的内部传输接口,注意传输的是apacket的数据内部。
外部接口的数据传输接口是:
static void transport_socket_events(int fd, unsigned events, void *_t){ atransport *t = _t; D("transport_socket_events(fd=%d, events=%04x,...)\n", fd, events); if(events & FDE_READ){ apacket *p = 0; if(read_packet(fd, t->serial, &p)){ D("%s: failed to read packet from transport socket on fd %d\n", t->serial, fd); } else { handle_packet(p, (atransport *) _t); } }} void send_packet(apacket *p, atransport *t){ unsigned char *x; unsigned sum; unsigned count; p->msg.magic = p->msg.command ^ 0xffffffff; count = p->msg.data_length; x = (unsigned char *) p->data; sum = 0; while(count-- > 0){ sum += *x++; } p->msg.data_check = sum; print_packet("send", p); if (t == NULL) { D("Transport is null \n"); errno = 0; fatal_errno("Transport is null"); } if(write_packet(t->transport_socket, t->serial, &p)){ fatal_errno("cannot enqueue packet on transport socket"); }}
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物理接口到atransport的接口是:
static void *output_thread(void *_t){ atransport *t = _t; apacket *p; D("%s: starting transport output thread on fd %d, SYNC online (%d)\n", t->serial, t->fd, t->sync_token + 1); p = get_apacket(); p->msg.command = A_SYNC; p->msg.arg0 = 1; p->msg.arg1 = ++(t->sync_token); p->msg.magic = A_SYNC ^ 0xffffffff; if(write_packet(t->fd, t->serial, &p)) { put_apacket(p); D("%s: failed to write SYNC packet\n", t->serial); goto oops; } D("%s: data pump started\n", t->serial); for(;;) { p = get_apacket(); if(t->read_from_remote(p, t) == 0){ D("%s: received remote packet, sending to transport\n", t->serial); if(write_packet(t->fd, t->serial, &p)){ put_apacket(p); D("%s: failed to write apacket to transport\n", t->serial); goto oops; } } else { D("%s: remote read failed for transport\n", t->serial); put_apacket(p); break; } } D("%s: SYNC offline for transport\n", t->serial); p = get_apacket(); p->msg.command = A_SYNC; p->msg.arg0 = 0; p->msg.arg1 = 0; p->msg.magic = A_SYNC ^ 0xffffffff; if(write_packet(t->fd, t->serial, &p)) { put_apacket(p); D("%s: failed to write SYNC apacket to transport", t->serial); }oops: D("%s: transport output thread is exiting\n", t->serial); kick_transport(t); transport_unref(t); return 0;}
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这里做了一个物理到抽象的转换。最上层还有一层是tmsg的传输 , tmsg的作用是用于atransport的管理
void init_transport_registration(void){ int s[2]; if(adb_socketpair(s)){ fatal_errno("cannot open transport registration socketpair"); } transport_registration_send = s[0]; transport_registration_recv = s[1]; fdevent_install(&transport_registration_fde, transport_registration_recv, transport_registration_func, 0); fdevent_set(&transport_registration_fde, FDE_READ);}static void register_transport(atransport *transport){ tmsg m; m.transport = transport; m.action = 1; D("transport: %s registered\n", transport->serial); if(transport_write_action(transport_registration_send, &m)) { fatal_errno("cannot write transport registration socket\n"); }}static void remove_transport(atransport *transport){ tmsg m; m.transport = transport; m.action = 0; D("transport: %s removed\n", transport->serial); if(transport_write_action(transport_registration_send, &m)) { fatal_errno("cannot write transport registration socket\n"); }}
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未完待续。。。