Magisk/native/jni/core/magisk.cpp

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#include <sys/mount.h>
#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
#include <libgen.h>
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#include <string.h>
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#include <utils.hpp>
#include <magisk.hpp>
#include <daemon.hpp>
#include <selinux.hpp>
#include <flags.h>
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using namespace std::literals;
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[[noreturn]] static void usage() {
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fprintf(stderr,
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NAME_WITH_VER(Magisk) R"EOF( multi-call binary
Usage: magisk [applet [arguments]...]
or: magisk [options]...
Options:
-c print current binary version
-v print running daemon version
-V print running daemon version code
--list list all available applets
--daemon manually start magisk daemon
--remove-modules remove all modules and reboot
Advanced Options (Internal APIs):
--[init trigger] start service for init trigger
Supported init triggers:
post-fs-data, service, boot-complete
--unlock-blocks set BLKROSET flag to OFF for all block devices
--restorecon restore selinux context on Magisk files
--clone-attr SRC DEST clone permission, owner, and selinux context
--clone SRC DEST clone SRC to DEST
--sqlite SQL exec SQL commands to Magisk database
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--path print Magisk tmpfs mount path
Available applets:
)EOF");
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for (int i = 0; applet_names[i]; ++i)
fprintf(stderr, i ? ", %s" : " %s", applet_names[i]);
fprintf(stderr, "\n\n");
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exit(1);
}
int magisk_main(int argc, char *argv[]) {
if (argc < 2)
usage();
if (argv[1] == "-c"sv) {
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printf(MAGISK_VERSION ":MAGISK (" str(MAGISK_VER_CODE) ")\n");
return 0;
} else if (argv[1] == "-v"sv) {
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int fd = connect_daemon();
write_int(fd, CHECK_VERSION);
char *v = read_string(fd);
printf("%s\n", v);
free(v);
return 0;
} else if (argv[1] == "-V"sv) {
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int fd = connect_daemon();
write_int(fd, CHECK_VERSION_CODE);
printf("%d\n", read_int(fd));
return 0;
} else if (argv[1] == "--list"sv) {
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for (int i = 0; applet_names[i]; ++i)
printf("%s\n", applet_names[i]);
return 0;
} else if (argv[1] == "--unlock-blocks"sv) {
unlock_blocks();
return 0;
} else if (argv[1] == "--restorecon"sv) {
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restorecon();
return 0;
Introduce component agnostic communication Usually, the communication between native and the app is done via sending intents to either broadcast or activity. These communication channels are for launching root requests dialogs, sending root request notifications (the toast you see when an app gained root access), and root request logging. Sending intents by am (activity manager) usually requires specifying the component name in the format of <pkg>/<class name>. This means parts of Magisk Manager cannot be randomized or else the native daemon is unable to know where to send data to the app. On modern Android (not sure which API is it introduced), it is possible to send broadcasts to a package, not a specific component. Which component will receive the intent depends on the intent filter declared in AndroidManifest.xml. Since we already have a mechanism in native code to keep track of the package name of Magisk Manager, this makes it perfect to pass intents to Magisk Manager that have components being randomly obfuscated (stub APKs). There are a few caveats though. Although this broadcasting method works perfectly fine on AOSP and most systems, there are OEMs out there shipping ROMs blocking broadcasts unexpectedly. In order to make sure Magisk works in all kinds of scenarios, we run actual tests every boot to determine which communication method should be used. We have 3 methods in total, ordered in preference: 1. Broadcasting to a package 2. Broadcasting to a specific component 3. Starting a specific activity component Method 3 will always work on any device, but the downside is anytime a communication happens, Magisk Manager will steal foreground focus regardless of whether UI is drawn. Method 1 is the only way to support obfuscated stub APKs. The communication test will test method 1 and 2, and if Magisk Manager is able to receive the messages, it will then update the daemon configuration to use whichever is preferable. If none of the broadcasts can be delivered, then the fallback method 3 will be used.
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} else if (argc >= 4 && argv[1] == "--clone-attr"sv) {;
clone_attr(argv[2], argv[3]);
return 0;
Introduce component agnostic communication Usually, the communication between native and the app is done via sending intents to either broadcast or activity. These communication channels are for launching root requests dialogs, sending root request notifications (the toast you see when an app gained root access), and root request logging. Sending intents by am (activity manager) usually requires specifying the component name in the format of <pkg>/<class name>. This means parts of Magisk Manager cannot be randomized or else the native daemon is unable to know where to send data to the app. On modern Android (not sure which API is it introduced), it is possible to send broadcasts to a package, not a specific component. Which component will receive the intent depends on the intent filter declared in AndroidManifest.xml. Since we already have a mechanism in native code to keep track of the package name of Magisk Manager, this makes it perfect to pass intents to Magisk Manager that have components being randomly obfuscated (stub APKs). There are a few caveats though. Although this broadcasting method works perfectly fine on AOSP and most systems, there are OEMs out there shipping ROMs blocking broadcasts unexpectedly. In order to make sure Magisk works in all kinds of scenarios, we run actual tests every boot to determine which communication method should be used. We have 3 methods in total, ordered in preference: 1. Broadcasting to a package 2. Broadcasting to a specific component 3. Starting a specific activity component Method 3 will always work on any device, but the downside is anytime a communication happens, Magisk Manager will steal foreground focus regardless of whether UI is drawn. Method 1 is the only way to support obfuscated stub APKs. The communication test will test method 1 and 2, and if Magisk Manager is able to receive the messages, it will then update the daemon configuration to use whichever is preferable. If none of the broadcasts can be delivered, then the fallback method 3 will be used.
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} else if (argc >= 4 && argv[1] == "--clone"sv) {
cp_afc(argv[2], argv[3]);
return 0;
} else if (argv[1] == "--daemon"sv) {
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int fd = connect_daemon(true);
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write_int(fd, DO_NOTHING);
return 0;
} else if (argv[1] == "--post-fs-data"sv) {
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int fd = connect_daemon(true);
write_int(fd, POST_FS_DATA);
return read_int(fd);
} else if (argv[1] == "--service"sv) {
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int fd = connect_daemon(true);
write_int(fd, LATE_START);
return read_int(fd);
} else if (argv[1] == "--boot-complete"sv) {
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int fd = connect_daemon(true);
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write_int(fd, BOOT_COMPLETE);
return read_int(fd);
Introduce component agnostic communication Usually, the communication between native and the app is done via sending intents to either broadcast or activity. These communication channels are for launching root requests dialogs, sending root request notifications (the toast you see when an app gained root access), and root request logging. Sending intents by am (activity manager) usually requires specifying the component name in the format of <pkg>/<class name>. This means parts of Magisk Manager cannot be randomized or else the native daemon is unable to know where to send data to the app. On modern Android (not sure which API is it introduced), it is possible to send broadcasts to a package, not a specific component. Which component will receive the intent depends on the intent filter declared in AndroidManifest.xml. Since we already have a mechanism in native code to keep track of the package name of Magisk Manager, this makes it perfect to pass intents to Magisk Manager that have components being randomly obfuscated (stub APKs). There are a few caveats though. Although this broadcasting method works perfectly fine on AOSP and most systems, there are OEMs out there shipping ROMs blocking broadcasts unexpectedly. In order to make sure Magisk works in all kinds of scenarios, we run actual tests every boot to determine which communication method should be used. We have 3 methods in total, ordered in preference: 1. Broadcasting to a package 2. Broadcasting to a specific component 3. Starting a specific activity component Method 3 will always work on any device, but the downside is anytime a communication happens, Magisk Manager will steal foreground focus regardless of whether UI is drawn. Method 1 is the only way to support obfuscated stub APKs. The communication test will test method 1 and 2, and if Magisk Manager is able to receive the messages, it will then update the daemon configuration to use whichever is preferable. If none of the broadcasts can be delivered, then the fallback method 3 will be used.
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} else if (argc >= 3 && argv[1] == "--sqlite"sv) {
int fd = connect_daemon();
write_int(fd, SQLITE_CMD);
write_string(fd, argv[2]);
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for (;;) {
char *res = read_string(fd);
if (res[0] == '\0') {
return 0;
}
printf("%s\n", res);
free(res);
}
} else if (argv[1] == "--remove-modules"sv) {
int fd = connect_daemon();
write_int(fd, REMOVE_MODULES);
return read_int(fd);
} else if (argv[1] == "--path"sv) {
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int fd = connect_daemon();
write_int(fd, GET_PATH);
char *path = read_string(fd);
printf("%s\n", path);
return 0;
}
#if 0
/* Entry point for testing stuffs */
else if (argv[1] == "--test"sv) {
return 0;
}
#endif
usage();
}