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platform_system_core
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platform_system_core/adb/adb_main.cpp

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/*
* Copyright (C) 2015 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_ADB
#include "sysdeps.h"
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include "adb.h"
#include "adb_auth.h"
#include "adb_listeners.h"
#include "transport.h"
#include <base/stringprintf.h>
#if !ADB_HOST
#include <getopt.h>
#include <sys/prctl.h>
#include "cutils/properties.h"
#include "private/android_filesystem_config.h"
#include "selinux/selinux.h"
#include "qemu_tracing.h"
#endif
static void adb_cleanup(void)
{
usb_cleanup();
}
#if defined(_WIN32)
static BOOL WINAPI ctrlc_handler(DWORD type)
{
exit(STATUS_CONTROL_C_EXIT);
return TRUE;
}
#endif
#if ADB_HOST
#ifdef WORKAROUND_BUG6558362
#include <sched.h>
#define AFFINITY_ENVVAR "ADB_CPU_AFFINITY_BUG6558362"
void adb_set_affinity(void)
{
cpu_set_t cpu_set;
const char* cpunum_str = getenv(AFFINITY_ENVVAR);
char* strtol_res;
int cpu_num;
if (!cpunum_str || !*cpunum_str)
return;
cpu_num = strtol(cpunum_str, &strtol_res, 0);
if (*strtol_res != '\0')
fatal("bad number (%s) in env var %s. Expecting 0..n.\n", cpunum_str, AFFINITY_ENVVAR);
sched_getaffinity(0, sizeof(cpu_set), &cpu_set);
D("orig cpu_set[0]=0x%08lx\n", cpu_set.__bits[0]);
CPU_ZERO(&cpu_set);
CPU_SET(cpu_num, &cpu_set);
sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
sched_getaffinity(0, sizeof(cpu_set), &cpu_set);
D("new cpu_set[0]=0x%08lx\n", cpu_set.__bits[0]);
}
#endif
#else /* ADB_HOST */
static const char *root_seclabel = NULL;
static void drop_capabilities_bounding_set_if_needed() {
#ifdef ALLOW_ADBD_ROOT
char value[PROPERTY_VALUE_MAX];
property_get("ro.debuggable", value, "");
if (strcmp(value, "1") == 0) {
return;
}
#endif
int i;
for (i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {
if (i == CAP_SETUID || i == CAP_SETGID) {
// CAP_SETUID CAP_SETGID needed by /system/bin/run-as
continue;
}
int err = prctl(PR_CAPBSET_DROP, i, 0, 0, 0);
// Some kernels don't have file capabilities compiled in, and
// prctl(PR_CAPBSET_DROP) returns EINVAL. Don't automatically
// die when we see such misconfigured kernels.
if ((err < 0) && (errno != EINVAL)) {
exit(1);
}
}
}
static bool should_drop_privileges() {
#if defined(ALLOW_ADBD_ROOT)
char value[PROPERTY_VALUE_MAX];
// The emulator is never secure, so don't drop privileges there.
// TODO: this seems like a bug --- shouldn't the emulator behave like a device?
property_get("ro.kernel.qemu", value, "");
if (strcmp(value, "1") == 0) {
return false;
}
// The properties that affect `adb root` and `adb unroot` are ro.secure and
// ro.debuggable. In this context the names don't make the expected behavior
// particularly obvious.
//
// ro.debuggable:
// Allowed to become root, but not necessarily the default. Set to 1 on
// eng and userdebug builds.
//
// ro.secure:
// Drop privileges by default. Set to 1 on userdebug and user builds.
property_get("ro.secure", value, "1");
bool ro_secure = (strcmp(value, "1") == 0);
property_get("ro.debuggable", value, "");
bool ro_debuggable = (strcmp(value, "1") == 0);
// Drop privileges if ro.secure is set...
bool drop = ro_secure;
property_get("service.adb.root", value, "");
bool adb_root = (strcmp(value, "1") == 0);
bool adb_unroot = (strcmp(value, "0") == 0);
// ...except "adb root" lets you keep privileges in a debuggable build.
if (ro_debuggable && adb_root) {
drop = false;
}
// ...and "adb unroot" lets you explicitly drop privileges.
if (adb_unroot) {
drop = true;
}
return drop;
#else
return true; // "adb root" not allowed, always drop privileges.
#endif /* ALLOW_ADBD_ROOT */
}
#endif /* ADB_HOST */
void start_logging(void)
{
#if defined(_WIN32)
char temp[ MAX_PATH ];
FILE* fnul;
FILE* flog;
GetTempPath( sizeof(temp) - 8, temp );
strcat( temp, "adb.log" );
/* Win32 specific redirections */
fnul = fopen( "NUL", "rt" );
if (fnul != NULL)
stdin[0] = fnul[0];
flog = fopen( temp, "at" );
if (flog == NULL)
flog = fnul;
setvbuf( flog, NULL, _IONBF, 0 );
stdout[0] = flog[0];
stderr[0] = flog[0];
fprintf(stderr,"--- adb starting (pid %d) ---\n", getpid());
#else
int fd;
fd = unix_open("/dev/null", O_RDONLY);
dup2(fd, 0);
adb_close(fd);
fd = unix_open("/tmp/adb.log", O_WRONLY | O_CREAT | O_APPEND, 0640);
if(fd < 0) {
fd = unix_open("/dev/null", O_WRONLY);
}
dup2(fd, 1);
dup2(fd, 2);
adb_close(fd);
fprintf(stderr,"--- adb starting (pid %d) ---\n", getpid());
#endif
}
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);
#if defined(_WIN32)
SetConsoleCtrlHandler( ctrlc_handler, TRUE );
#else
// No SIGCHLD. Let the service subproc handle its children.
signal(SIGPIPE, SIG_IGN);
#endif
init_transport_registration();
#if ADB_HOST
HOST = 1;
#ifdef WORKAROUND_BUG6558362
if(is_daemon) adb_set_affinity();
#endif
usb_init();
local_init(DEFAULT_ADB_LOCAL_TRANSPORT_PORT);
adb_auth_init();
std::string local_name = android::base::StringPrintf("tcp:%d", server_port);
if (install_listener(local_name, "*smartsocket*", NULL, 0)) {
exit(1);
}
#else
// We need to call this even if auth isn't enabled because the file
// descriptor will always be open.
adbd_cloexec_auth_socket();
if (ALLOW_ADBD_NO_AUTH && property_get_bool("ro.adb.secure", 0) == 0) {
auth_required = false;
}
adbd_auth_init();
// Our external storage path may be different than apps, since
// we aren't able to bind mount after dropping root.
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");
}
/* add extra groups:
** AID_ADB to access the USB driver
** AID_LOG to read system logs (adb logcat)
** AID_INPUT to diagnose input issues (getevent)
** AID_INET to diagnose network issues (ping)
** AID_NET_BT and AID_NET_BT_ADMIN to diagnose bluetooth (hcidump)
** AID_SDCARD_R to allow reading from the SD card
** AID_SDCARD_RW to allow writing to the SD card
** AID_NET_BW_STATS to read out qtaguid statistics
*/
gid_t groups[] = { AID_ADB, AID_LOG, AID_INPUT, AID_INET, AID_NET_BT,
AID_NET_BT_ADMIN, AID_SDCARD_R, AID_SDCARD_RW,
AID_NET_BW_STATS };
if (setgroups(sizeof(groups)/sizeof(groups[0]), groups) != 0) {
exit(1);
}
/* don't listen on a port (default 5037) if running in secure mode */
/* don't run as root if we are running in secure mode */
if (should_drop_privileges()) {
drop_capabilities_bounding_set_if_needed();
/* then switch user and group to "shell" */
if (setgid(AID_SHELL) != 0) {
exit(1);
}
if (setuid(AID_SHELL) != 0) {
exit(1);
}
D("Local port disabled\n");
} else {
if ((root_seclabel != NULL) && (is_selinux_enabled() > 0)) {
// b/12587913: fix setcon to allow const pointers
if (setcon((char *)root_seclabel) < 0) {
exit(1);
}
}
std::string local_name = android::base::StringPrintf("tcp:%d", 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) {
// listen on USB
usb_init();
usb = 1;
}
// If one of these properties is set, also listen on that port
// If one of the properties isn't set and we couldn't listen on usb,
// listen on the default port.
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);
// listen on TCP port specified by service.adb.tcp.port property
local_init(port);
} else if (!usb) {
// listen on default port
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)
{
// inform our parent that we are up and running.
#if defined(_WIN32)
DWORD count;
WriteFile( GetStdHandle( STD_OUTPUT_HANDLE ), "OK\n", 3, &count, NULL );
#else
fprintf(stderr, "OK\n");
#endif
start_logging();
}
D("Event loop starting\n");
fdevent_loop();
usb_cleanup();
return 0;
}
#if !ADB_HOST
void close_stdin() {
int fd = unix_open("/dev/null", O_RDONLY);
if (fd == -1) {
perror("failed to open /dev/null, stdin will remain open");
return;
}
dup2(fd, 0);
adb_close(fd);
}
#endif
// TODO(danalbert): Split this file up into adb_main.cpp and adbd_main.cpp.
int main(int argc, char **argv) {
#if ADB_HOST
// adb client/server
adb_sysdeps_init();
adb_trace_init();
D("Handling commandline()\n");
return adb_commandline(argc - 1, const_cast<const char**>(argv + 1));
#else
// adbd
while (true) {
static struct option opts[] = {
{"root_seclabel", required_argument, nullptr, 's'},
{"device_banner", required_argument, nullptr, 'b'},
{"version", no_argument, nullptr, 'v'},
};
int option_index = 0;
int c = getopt_long(argc, argv, "", opts, &option_index);
if (c == -1)
break;
switch (c) {
case 's':
root_seclabel = optarg;
break;
case 'b':
adb_device_banner = optarg;
break;
case 'v':
printf("Android Debug Bridge Daemon version %d.%d.%d %s\n",
ADB_VERSION_MAJOR, ADB_VERSION_MINOR, ADB_SERVER_VERSION,
ADB_REVISION);
return 0;
default:
break;
}
}
close_stdin();
adb_trace_init();
/* If adbd runs inside the emulator this will enable adb tracing via
* adb-debug qemud service in the emulator. */
adb_qemu_trace_init();
D("Handling main()\n");
return adb_main(0, DEFAULT_ADB_PORT);
#endif
}
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