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Try to use broadcast for su logging and notify

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In commit 8d4c407, native Magisk always launches an activity for
communicating with Magisk Manager. While this works extremely well,
since it also workaround stupid OEMs that blocks broadcasts, it has a
problem: launching an activity will claim the focus of the device,
which could be super annoying in some circumstances.

This commit adds a new feature to run a broadcast test on boot complete.
If Magisk Manager successfully receives the broadcast, it will toggle
a setting in magiskd so all future su loggings and notifies will always
use broadcasts instead of launching activities.

Fix #1412
This commit is contained in:
topjohnwu
2019-05-13 02:01:10 -07:00
parent 89275270f3
commit 80cd85b061
12 changed files with 173 additions and 133 deletions
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74
native/jni/su/connect.cpp
View File

@@ -11,12 +11,21 @@
#include "su.h"
bool CONNECT_BROADCAST;
#define START_ACTIVITY \
"/system/bin/app_process", "/system/bin", "com.android.commands.am.Am", \
"start", "-n", nullptr, "--user", nullptr, "-f", "0x18000020", "-a"
// 0x18000020 = FLAG_ACTIVITY_NEW_TASK|FLAG_ACTIVITY_MULTIPLE_TASK|FLAG_INCLUDE_STOPPED_PACKAGES
#define START_BROADCAST \
"/system/bin/app_process", "/system/bin", "com.android.commands.am.Am", \
"broadcast", "-n", nullptr, "--user", nullptr, "-f", "0x00000020", \
"-a", "android.intent.action.REBOOT", "--es", "action"
// 0x00000020 = FLAG_INCLUDE_STOPPED_PACKAGES
static inline const char *get_command(const su_request *to) {
if (to->command[0])
return to->command;
@@ -39,9 +48,9 @@ static inline void get_uid(char *uid, su_info *info) {
: info->uid);
}
static void silent_run(const char **args, su_info *info) {
static void exec_am_cmd(const char **args, su_info *info) {
char component[128];
sprintf(component, "%s/a.m", info->str[SU_MANAGER].data());
sprintf(component, "%s/%s", info->str[SU_MANAGER].data(), args[3][0] == 'b' ? "a.h" : "a.m");
char user[8];
get_user(user, info);
@@ -62,6 +71,16 @@ static void silent_run(const char **args, su_info *info) {
exec_command(exec);
}
#define LOG_BODY \
"log", \
"--ei", "from.uid", fromUid, \
"--ei", "to.uid", toUid, \
"--ei", "pid", pid, \
"--ei", "policy", policy, \
"--es", "command", get_command(&ctx->req), \
"--ez", "notify", ctx->info->access.notify ? "true" : "false", \
nullptr
void app_log(su_context *ctx) {
char fromUid[8];
get_uid(fromUid, ctx->info);
@@ -75,19 +94,21 @@ void app_log(su_context *ctx) {
char policy[2];
sprintf(policy, "%d", ctx->info->access.policy);
const char *cmd[] = {
START_ACTIVITY, "log",
"--ei", "from.uid", fromUid,
"--ei", "to.uid", toUid,
"--ei", "pid", pid,
"--ei", "policy", policy,
"--es", "command", get_command(&ctx->req),
"--ez", "notify", ctx->info->access.notify ? "true" : "false",
nullptr
};
silent_run(cmd, ctx->info);
if (CONNECT_BROADCAST) {
const char *cmd[] = { START_BROADCAST, LOG_BODY };
exec_am_cmd(cmd, ctx->info);
} else {
const char *cmd[] = { START_ACTIVITY, LOG_BODY };
exec_am_cmd(cmd, ctx->info);
}
}
#define NOTIFY_BODY \
"notify", \
"--ei", "from.uid", fromUid, \
"--ei", "policy", policy, \
nullptr
void app_notify(su_context *ctx) {
char fromUid[8];
get_uid(fromUid, ctx->info);
@@ -95,13 +116,14 @@ void app_notify(su_context *ctx) {
char policy[2];
sprintf(policy, "%d", ctx->info->access.policy);
const char *cmd[] = {
START_ACTIVITY, "notify",
"--ei", "from.uid", fromUid,
"--ei", "policy", policy,
nullptr
};
silent_run(cmd, ctx->info);
if (CONNECT_BROADCAST) {
const char *cmd[] = { START_BROADCAST, NOTIFY_BODY };
exec_am_cmd(cmd, ctx->info);
} else {
const char *cmd[] = { START_ACTIVITY, NOTIFY_BODY };
exec_am_cmd(cmd, ctx->info);
}
}
void app_connect(const char *socket, su_info *info) {
@@ -110,7 +132,17 @@ void app_connect(const char *socket, su_info *info) {
"--es", "socket", socket,
nullptr
};
silent_run(cmd, info);
exec_am_cmd(cmd, info);
}
void broadcast_test() {
su_info info;
get_db_settings(info.cfg);
get_db_strings(info.str);
validate_manager(info.str[SU_MANAGER], 0, &info.mgr_st);
const char *cmd[] = { START_BROADCAST, "test", nullptr };
exec_am_cmd(cmd, &info);
}
void socket_send_request(int fd, su_info *info) {

2
native/jni/su/su.h
View File

@@ -32,7 +32,7 @@ public:
int ref;
time_t timestamp;
su_info(unsigned uid);
su_info(unsigned uid = 0);
~su_info();
void lock();
void unlock();

2
native/jni/su/su_daemon.cpp
View File

@@ -83,7 +83,7 @@ static void database_check(su_info *info) {
}
if (uid > 0)
get_uid_policy(uid, info->access);
get_uid_policy(info->access, uid);
// We need to check our manager
if (info->access.log || info->access.notify)