Magisk/jni/daemon/magisk.c

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/* main.c - The multicall entry point
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*/
#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "utils.h"
#include "magisk.h"
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#include "daemon.h"
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char *argv0;
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char *applet[] =
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{ "su", "resetprop", "magiskpolicy", "supolicy", "magiskhide", NULL };
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int (*applet_main[]) (int, char *[]) =
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{ su_client_main, resetprop_main, magiskpolicy_main, magiskpolicy_main, magiskhide_main, NULL };
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int create_links(const char *bin, const char *path) {
char self[PATH_MAX], linkpath[PATH_MAX];
if (bin == NULL) {
xreadlink("/proc/self/exe", self, sizeof(self));
bin = self;
}
int ret = 0;
for (int i = 0; applet[i]; ++i) {
snprintf(linkpath, sizeof(linkpath), "%s/%s", path, applet[i]);
unlink(linkpath);
ret |= symlink(bin, linkpath);
}
return ret;
}
// Global error hander function
// Should be changed each thread/process
__thread void (*err_handler)(void);
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static void usage() {
fprintf(stderr,
"Magisk v" xstr(MAGISK_VERSION) "(" xstr(MAGISK_VER_CODE) ") (by topjohnwu) multi-call binary\n"
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"\n"
"Usage: %s [applet [arguments]...]\n"
" or: %s [options]...\n"
"\n"
"Options:\n"
" -c print current binary version\n"
" -v print running daemon version\n"
" -V print running daemon version code\n"
" --list list all availible applets\n"
" --install [SOURCE] DIR symlink all applets to DIR. SOURCE is optional\n"
" --createimg IMG SIZE create ext4 image. SIZE is interpreted in MB\n"
" --imgsize IMG report ext4 image used/total size\n"
" --resizeimg IMG SIZE resize ext4 image. SIZE is interpreted in MB\n"
" --mountimg IMG PATH mount IMG to PATH and prints the loop device\n"
" --umountimg PATH LOOP unmount PATH and delete LOOP device\n"
" --[init service] start init service\n"
" --unlock-blocks set BLKROSET flag to OFF for all block devices\n"
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"\n"
"Supported init services:\n"
" daemon post-fs, post-fs-data, service\n"
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"\n"
"Supported applets:\n"
, argv0, argv0);
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for (int i = 0; applet[i]; ++i)
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fprintf(stderr, i ? ", %s" : " %s", applet[i]);
fprintf(stderr, "\n\n");
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exit(1);
}
int main(int argc, char *argv[]) {
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argv0 = argv[0];
// Exit the whole app if error occurs by default
err_handler = exit_proc;
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char * arg = strrchr(argv[0], '/');
if (arg) ++arg;
else arg = argv[0];
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if (strcmp(arg, "magisk") == 0) {
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if (argc < 2) usage();
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if (strcmp(argv[1], "-c") == 0) {
printf("%s\n", MAGISK_VER_STR);
return 0;
} else if (strcmp(argv[1], "-v") == 0) {
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int fd = connect_daemon();
write_int(fd, CHECK_VERSION);
char *v = read_string(fd);
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printf("%s\n", v);
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free(v);
return 0;
} else if (strcmp(argv[1], "-V") == 0) {
int fd = connect_daemon();
write_int(fd, CHECK_VERSION_CODE);
printf("%d\n", read_int(fd));
return 0;
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} else if (strcmp(argv[1], "--install") == 0) {
if (argc < 3) usage();
if (argc == 3) return create_links(NULL, argv[2]);
else return create_links(argv[2], argv[3]);
} else if (strcmp(argv[1], "--list") == 0) {
for (int i = 0; applet[i]; ++i)
printf("%s\n", applet[i]);
return 0;
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} else if (strcmp(argv[1], "--createimg") == 0) {
if (argc < 4) usage();
int size;
sscanf(argv[3], "%d", &size);
return create_img(argv[2], size);
} else if (strcmp(argv[1], "--imgsize") == 0) {
if (argc < 3) usage();
int used, total;
if (get_img_size(argv[2], &used, &total)) {
fprintf(stderr, "Cannot check %s size\n", argv[2]);
return 1;
}
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printf("%d %d\n", used, total);
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return 0;
} else if (strcmp(argv[1], "--resizeimg") == 0) {
if (argc < 4) usage();
int used, total, size;
sscanf(argv[3], "%d", &size);
if (get_img_size(argv[2], &used, &total)) {
fprintf(stderr, "Cannot check %s size\n", argv[2]);
return 1;
}
if (size <= used) {
fprintf(stderr, "Cannot resize smaller than %dM\n", used);
return 1;
}
return resize_img(argv[2], size);
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} else if (strcmp(argv[1], "--mountimg") == 0) {
if (argc < 4) usage();
char *loop = mount_image(argv[2], argv[3]);
if (loop == NULL) {
fprintf(stderr, "Cannot mount image!\n");
return 1;
} else {
printf("%s\n", loop);
free(loop);
return 0;
}
} else if (strcmp(argv[1], "--umountimg") == 0) {
if (argc < 4) usage();
umount_image(argv[2], argv[3]);
return 0;
} else if (strcmp(argv[1], "--unlock-blocks") == 0) {
unlock_blocks();
return 0;
} else if (strcmp(argv[1], "--daemon") == 0) {
// Start daemon, this process won't return
start_daemon();
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} else if (strcmp(argv[1], "--post-fs") == 0) {
int fd = connect_daemon();
write_int(fd, POST_FS);
return read_int(fd);
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} else if (strcmp(argv[1], "--post-fs-data") == 0) {
int fd = connect_daemon();
write_int(fd, POST_FS_DATA);
return read_int(fd);
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} else if (strcmp(argv[1], "--service") == 0) {
int fd = connect_daemon();
write_int(fd, LATE_START);
return read_int(fd);
} else {
// It's calling applets
--argc;
++argv;
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arg = argv[0];
}
}
// Applets
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for (int i = 0; applet[i]; ++i) {
if (strcmp(arg, applet[i]) == 0)
return (*applet_main[i])(argc, argv);
}
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fprintf(stderr, "%s: applet not found\n", arg);
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return 1;
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}