Magisk/native/jni/su/connect.cpp

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#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdio.h>
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#include <daemon.h>
#include <utils.h>
#include "su.h"
using namespace std;
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
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static inline const char *get_command(const su_request *to) {
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if (to->command[0])
return to->command;
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if (to->shell[0])
return to->shell;
return DEFAULT_SHELL;
}
static inline void get_user(char *user, const su_info *info) {
sprintf(user, "%d",
info->cfg[SU_MULTIUSER_MODE] == MULTIUSER_MODE_USER
? info->uid / 100000
: 0);
}
static inline void get_uid(char *uid, const su_info *info) {
sprintf(uid, "%d",
info->cfg[SU_MULTIUSER_MODE] == MULTIUSER_MODE_OWNER_MANAGED
? info->uid % 100000
: info->uid);
}
static void exec_am_cmd(const char **args, const su_info *info) {
char component[128];
sprintf(component, "%s/%s", info->str[SU_MANAGER].data(), args[3][0] == 'b' ? "a.h" : "a.m");
char user[8];
get_user(user, info);
/* Fill in dynamic arguments */
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args[5] = component;
args[7] = user;
exec_t exec {
.pre_exec = []() -> void {
int null = xopen("/dev/null", O_WRONLY | O_CLOEXEC);
dup2(null, STDOUT_FILENO);
dup2(null, STDERR_FILENO);
setenv("CLASSPATH", "/system/framework/am.jar", 1);
},
.fork = fork_dont_care,
.argv = args
};
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(const su_context &ctx) {
char fromUid[8];
get_uid(fromUid, ctx.info.get());
char toUid[8];
sprintf(toUid, "%d", ctx.req.uid);
char pid[8];
sprintf(pid, "%d", ctx.pid);
char policy[2];
sprintf(policy, "%d", ctx.info->access.policy);
if (CONNECT_BROADCAST) {
const char *cmd[] = { START_BROADCAST, LOG_BODY };
exec_am_cmd(cmd, ctx.info.get());
} else {
const char *cmd[] = { START_ACTIVITY, LOG_BODY };
exec_am_cmd(cmd, ctx.info.get());
}
}
#define NOTIFY_BODY \
"notify", \
"--ei", "from.uid", fromUid, \
"--ei", "policy", policy, \
nullptr
void app_notify(const su_context &ctx) {
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char fromUid[8];
get_uid(fromUid, ctx.info.get());
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char policy[2];
sprintf(policy, "%d", ctx.info->access.policy);
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if (CONNECT_BROADCAST) {
const char *cmd[] = { START_BROADCAST, NOTIFY_BODY };
exec_am_cmd(cmd, ctx.info.get());
} else {
const char *cmd[] = { START_ACTIVITY, NOTIFY_BODY };
exec_am_cmd(cmd, ctx.info.get());
}
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}
void app_connect(const char *socket, const shared_ptr<su_info> &info) {
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const char *cmd[] = {
START_ACTIVITY, "request",
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"--es", "socket", socket,
nullptr
};
exec_am_cmd(cmd, info.get());
}
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, const shared_ptr<su_info> &info) {
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write_key_token(fd, "uid", info->uid);
write_string_be(fd, "eof");
}