mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-25 22:27:39 +00:00
336 lines
9.0 KiB
C
336 lines
9.0 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <utils.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include "magiskboot.h"
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#include "cpio.h"
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static void cpio_patch(struct vector *v, int keepverity, int keepforceencrypt) {
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fprintf(stderr, "Patch with flag KEEPVERITY=[%s] KEEPFORCEENCRYPT=[%s]\n",
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keepverity ? "true" : "false", keepforceencrypt ? "true" : "false");
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cpio_entry *e;
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vec_for_each(v, e) {
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if (!e) continue;
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if (!keepverity) {
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if (strncmp(e->filename, ".backup", 7) && strstr(e->filename, "fstab") && S_ISREG(e->mode)) {
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patch_verity(&e->data, &e->filesize, 1);
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} else if (strcmp(e->filename, "verity_key") == 0) {
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fprintf(stderr, "Remove [verity_key]\n");
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cpio_free(e);
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vec_cur(v) = NULL;
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continue;
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}
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}
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if (!keepforceencrypt) {
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if (strstr(e->filename, "fstab") != NULL && S_ISREG(e->mode)) {
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patch_encryption(&e->data, &e->filesize);
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}
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}
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}
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}
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#define STOCK_BOOT 0x0
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#define MAGISK_PATCH 0x1
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#define OTHER_PATCH 0x2
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static int cpio_test(struct vector *v) {
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const char *OTHER_LIST[] = { "sbin/launch_daemonsu.sh", "sbin/su", "init.xposed.rc", "boot/sbin/launch_daemonsu.sh", NULL };
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const char *MAGISK_LIST[] = { ".backup/.magisk", "init.magisk.rc", "overlay/init.magisk.rc", NULL };
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for (int i = 0; OTHER_LIST[i]; ++i)
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if (cpio_find(v, OTHER_LIST[i]) > 0)
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return OTHER_PATCH;
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for (int i = 0; MAGISK_LIST[i]; ++i)
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if (cpio_find(v, MAGISK_LIST[i]) > 0)
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return MAGISK_PATCH;
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return STOCK_BOOT;
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}
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static char *cpio_sha1(struct vector *v) {
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cpio_entry *e;
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char sha1[41];
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vec_for_each(v, e) {
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if (!e) continue;
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if (strcmp(e->filename, "init.magisk.rc") == 0
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|| strcmp(e->filename, "overlay/init.magisk.rc") == 0) {
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for (void *pos = e->data; pos < e->data + e->filesize; pos = strchr(pos + 1, '\n') + 1) {
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if (memcmp(pos, "# STOCKSHA1=", 12) == 0) {
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pos += 12;
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memcpy(sha1, pos, 40);
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sha1[40] = '\0';
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return strdup(sha1);
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}
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}
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} else if (strcmp(e->filename, ".backup/.sha1") == 0) {
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return e->data;
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}
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}
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return NULL;
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}
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static void cpio_backup(struct vector *v, struct vector *bak, const char *orig, const char *sha1) {
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struct vector o_body, *o = &o_body;
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cpio_entry *m, *n, *rem, *cksm;
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char buf[PATH_MAX];
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int res, backup;
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m = xcalloc(sizeof(*m), 1);
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m->filename = strdup(".backup");
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m->mode = S_IFDIR;
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vec_push_back(bak, m);
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rem = xcalloc(sizeof(*rem), 1);
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rem->filename = strdup(".backup/.rmlist");
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rem->mode = S_IFREG;
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if (sha1) {
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fprintf(stderr, "Save SHA1: [%s] -> [.backup/.sha1]\n", sha1);
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cksm = xcalloc(sizeof(*cksm), 1);
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vec_push_back(bak, cksm);
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cksm->filename = strdup(".backup/.sha1");
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cksm->mode = S_IFREG;
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cksm->data = strdup(sha1);
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cksm->filesize = strlen(sha1) + 1;
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}
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vec_init(o);
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parse_cpio(o, orig);
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// Remove possible backups in original ramdisk
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cpio_rm(o, 1, ".backup");
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cpio_rm(v, 1, ".backup");
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// Sort both vectors before comparing
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vec_sort(o, cpio_cmp);
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vec_sort(v, cpio_cmp);
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// Start comparing
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size_t i = 0, j = 0;
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while(i != vec_size(o) || j != vec_size(v)) {
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backup = 0;
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if (i != vec_size(o) && j != vec_size(v)) {
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m = vec_entry(o)[i];
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n = vec_entry(v)[j];
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res = strcmp(m->filename, n->filename);
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} else if (i == vec_size(o)) {
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n = vec_entry(v)[j];
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res = 1;
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} else if (j == vec_size(v)) {
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m = vec_entry(o)[i];
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res = -1;
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}
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if (res < 0) {
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// Something is missing in new ramdisk, backup!
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++i;
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backup = 1;
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fprintf(stderr, "Backup missing entry: ");
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} else if (res == 0) {
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++i; ++j;
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if (m->filesize == n->filesize && memcmp(m->data, n->data, m->filesize) == 0)
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continue;
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// Not the same!
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backup = 1;
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fprintf(stderr, "Backup mismatch entry: ");
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} else {
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// Something new in ramdisk, record in rem
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++j;
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rem->data = xrealloc(rem->data, rem->filesize + strlen(n->filename) + 1);
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memcpy(rem->data + rem->filesize, n->filename, strlen(n->filename) + 1);
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rem->filesize += strlen(n->filename) + 1;
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fprintf(stderr, "Record new entry: [%s] -> [.backup/.rmlist]\n", n->filename);
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}
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if (backup) {
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sprintf(buf, ".backup/%s", m->filename);
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fprintf(stderr, "[%s] -> [%s]\n", m->filename, buf);
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free(m->filename);
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m->filename = strdup(buf);
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vec_push_back(bak, m);
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// NULL the original entry, so it won't be freed
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vec_entry(o)[i - 1] = NULL;
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}
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}
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if (rem->filesize)
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vec_push_back(bak, rem);
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else
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cpio_free(rem);
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// Cleanup
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cpio_vec_destroy(o);
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}
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static void cpio_restore(struct vector *v) {
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cpio_entry *e;
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vec_for_each(v, e) {
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if (!e) continue;
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if (strncmp(e->filename, ".backup", 7) == 0) {
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if (e->filename[7] == '\0') continue;
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if (e->filename[8] == '.') {
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if (strcmp(e->filename, ".backup/.rmlist") == 0) {
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for (int pos = 0; pos < e->filesize; pos += strlen(e->data + pos) + 1)
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cpio_rm(v, 0, e->data + pos);
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}
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continue;
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} else {
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fprintf(stderr, "Restore [%s] -> [%s]\n", e->filename, e->filename + 8);
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vec_cur(v) = NULL;
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char *new_name = strdup(e->filename + 8);
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free(e->filename);
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e->filename = new_name;
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cpio_vec_insert(v, e);
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}
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}
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}
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// Some known stuff we can remove
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cpio_rm(v, 1, ".backup");
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cpio_rm(v, 1, "overlay");
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cpio_rm(v, 0, "sbin/magic_mask.sh");
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cpio_rm(v, 0, "init.magisk.rc");
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cpio_rm(v, 0, "magisk");
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cpio_rm(v, 0, "ramdisk-recovery.xz");
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}
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static void restore_high_compress(struct vector *v, const char *incpio) {
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// Check if the ramdisk is in high compression mode
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if (cpio_extract(v, "ramdisk.cpio.xz", incpio) == 0) {
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void *xz;
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size_t size;
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full_read(incpio, &xz, &size);
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int fd = creat(incpio, 0644);
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lzma(0, fd, xz, size);
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close(fd);
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free(xz);
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cpio_rm(v, 0, "ramdisk.cpio.xz");
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cpio_rm(v, 0, "init");
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struct vector vv;
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vec_init(&vv);
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parse_cpio(&vv, incpio);
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cpio_entry *e;
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vec_for_each(&vv, e)
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vec_push_back(v, e);
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vec_destroy(&vv);
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}
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}
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static void enable_high_compress(struct vector *v, struct vector *b, const char *incpio) {
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cpio_entry *init, *magiskinit;
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// Swap magiskinit with original init
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int i = cpio_find(b, ".backup/init"), j = cpio_find(v, "init");
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init = vec_entry(b)[i];
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magiskinit = vec_entry(v)[j];
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free(init->filename);
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init->filename = strdup("init");
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vec_entry(v)[j] = init;
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vec_entry(b)[i] = NULL;
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dump_cpio(v, incpio);
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cpio_vec_destroy(v);
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void *cpio;
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size_t size;
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full_read(incpio, &cpio, &size);
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int fd = creat(incpio, 0644);
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lzma(1, fd, cpio, size);
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close(fd);
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free(cpio);
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vec_init(v);
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vec_push_back(v, magiskinit);
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cpio_add(v, 0, "ramdisk.cpio.xz", incpio);
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}
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int cpio_commands(int argc, char *argv[]) {
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char *incpio = argv[0];
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++argv;
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--argc;
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struct vector v;
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vec_init(&v);
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parse_cpio(&v, incpio);
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int cmdc;
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char *cmdv[6];
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while (argc) {
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cmdc = 0;
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for (char *tok = strtok(argv[0], " "); tok; tok = strtok(NULL, " "))
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cmdv[cmdc++] = tok;
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if (strcmp(cmdv[0], "test") == 0) {
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exit(cpio_test(&v));
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} else if (strcmp(cmdv[0], "restore") == 0) {
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restore_high_compress(&v, incpio);
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cpio_restore(&v);
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} else if (strcmp(cmdv[0], "sha1") == 0) {
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char *sha1 = cpio_sha1(&v);
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if (sha1)
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printf("%s\n", sha1);
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return 0;
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} else if (cmdc >= 2 && strcmp(cmdv[0], "backup") == 0) {
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struct vector back;
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vec_init(&back);
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cpio_backup(&v, &back, cmdv[1], cmdc > 2 ? cmdv[2] : NULL);
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cpio_entry *e;
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vec_for_each(&back, e)
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if (e) vec_push_back(&v, e);
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vec_destroy(&back);
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} else if (cmdc >= 5 && strcmp(cmdv[0], "magisk") == 0) {
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cpio_patch(&v, strcmp(cmdv[3], "true") == 0, strcmp(cmdv[4], "true") == 0);
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struct vector back;
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vec_init(&back);
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cpio_backup(&v, &back, cmdv[1], cmdc > 5 ? cmdv[5] : NULL);
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cpio_entry *e;
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e = xcalloc(sizeof(*e), 1);
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e->filename = strdup(".backup/.magisk");
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e->mode = S_IFREG;
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e->data = xmalloc(50);
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snprintf(e->data, 50, "KEEPVERITY=%s\nKEEPFORCEENCRYPT=%s\n", cmdv[3], cmdv[4]);
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e->filesize = strlen(e->data) + 1;
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vec_push_back(&back, e);
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// Enable high compression mode
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if (strcmp(cmdv[2], "true") == 0)
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enable_high_compress(&v, &back, incpio);
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vec_for_each(&back, e)
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if (e) vec_push_back(&v, e);
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vec_destroy(&back);
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} else if (cmdc >= 2 && strcmp(cmdv[0], "rm") == 0) {
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int recur = cmdc > 2 && strcmp(cmdv[1], "-r") == 0;
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cpio_rm(&v, recur, cmdv[1 + recur]);
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} else if (cmdc == 3 && strcmp(cmdv[0], "mv") == 0) {
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cpio_mv(&v, cmdv[1], cmdv[2]);
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} else if (cmdc == 3 && strcmp(cmdv[0], "patch") == 0) {
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cpio_patch(&v, strcmp(cmdv[1], "true") == 0, strcmp(cmdv[2], "true") == 0);
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} else if (strcmp(cmdv[0], "extract") == 0) {
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if (cmdc == 3) {
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return cpio_extract(&v, cmdv[1], cmdv[2]);
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} else {
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cpio_extract_all(&v);
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return 0;
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}
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} else if (cmdc == 3 && strcmp(cmdv[0], "mkdir") == 0) {
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cpio_mkdir(&v, strtoul(cmdv[1], NULL, 8), cmdv[2]);
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} else if (cmdc == 3 && strcmp(cmdv[0], "ln") == 0) {
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cpio_ln(&v, cmdv[1], cmdv[2]);
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} else if (cmdc == 4 && strcmp(cmdv[0], "add") == 0) {
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cpio_add(&v, strtoul(cmdv[1], NULL, 8), cmdv[2], cmdv[3]);
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} else {
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return 1;
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}
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--argc;
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++argv;
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}
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dump_cpio(&v, incpio);
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cpio_vec_destroy(&v);
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return 0;
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}
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