333 lines
8.6 KiB
C
333 lines
8.6 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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cpio_entry *f;
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vec_for_each(v, f) {
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if (!keepverity) {
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if (strstr(f->filename, "fstab") != NULL && S_ISREG(f->mode)) {
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patch_verity(&f->data, &f->filesize, 1);
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} else if (strcmp(f->filename, "verity_key") == 0) {
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fprintf(stderr, "Remove [verity_key]\n");
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f->remove = 1;
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}
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}
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if (!keepforceencrypt) {
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if (strstr(f->filename, "fstab") != NULL && S_ISREG(f->mode)) {
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patch_encryption(&f->data, &f->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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int ret = STOCK_BOOT;
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cpio_entry *f;
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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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vec_for_each(v, f) {
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for (int i = 0; OTHER_LIST[i]; ++i) {
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if (strcmp(f->filename, OTHER_LIST[i]) == 0) {
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// Already find other files, abort
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return OTHER_PATCH;
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}
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}
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for (int i = 0; MAGISK_LIST[i]; ++i) {
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if (strcmp(f->filename, MAGISK_LIST[i]) == 0)
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ret = MAGISK_PATCH;
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}
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}
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cpio_vec_destroy(v);
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return ret;
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}
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static char *cpio_stocksha1(struct vector *v) {
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cpio_entry *f;
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char sha1[41];
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vec_for_each(v, f) {
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if (strcmp(f->filename, "init.magisk.rc") == 0
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|| strcmp(f->filename, "overlay/init.magisk.rc") == 0) {
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for (char *pos = f->data; pos < f->data + f->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(f->filename, ".backup/.sha1") == 0) {
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return f->data;
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}
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}
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return NULL;
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}
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static struct vector *cpio_backup(struct vector *v, const char *orig, const char *keepverity,
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const char *keepforceencrypt, const char *sha1) {
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struct vector o_body, *o = &o_body, *ret;
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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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ret = xcalloc(sizeof(*ret), 1);
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vec_init(o);
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vec_init(ret);
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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(ret, m);
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m = xcalloc(sizeof(*m), 1);
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m->filename = strdup(".backup/.magisk");
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m->mode = S_IFREG;
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m->data = xmalloc(50);
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snprintf(m->data, 50, "KEEPVERITY=%s\nKEEPFORCEENCRYPT=%s\n", keepverity, keepforceencrypt);
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m->filesize = strlen(m->data) + 1;
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vec_push_back(ret, 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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vec_push_back(ret, rem);
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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(ret, 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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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(v, cpio_cmp);
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vec_sort(o, 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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// Someting new in ramdisk, record in rem
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++j;
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if (n->remove) continue;
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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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free(m->filename);
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m->filename = strdup(buf);
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fprintf(stderr, "[%s] -> [%s]\n", buf, m->filename);
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vec_push_back(ret, 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 == 0)
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rem->remove = 1;
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// Cleanup
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cpio_vec_destroy(o);
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return ret;
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}
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static void cpio_restore(struct vector *v) {
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cpio_entry *f, *n;
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vec_for_each(v, f) {
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if (strncmp(f->filename, ".backup", 7) == 0) {
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f->remove = 1;
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if (f->filename[7] == '\0') continue;
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if (f->filename[8] == '.') {
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if (strcmp(f->filename, ".backup/.rmlist") == 0) {
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for (int pos = 0; pos < f->filesize; pos += strlen(f->data + pos) + 1)
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cpio_rm(v, 0, f->data + pos);
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}
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continue;
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} else {
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n = xcalloc(sizeof(*n), 1);
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memcpy(n, f, sizeof(*f));
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n->filename = strdup(f->filename + 8);
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n->data = f->data;
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f->data = NULL;
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n->remove = 0;
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fprintf(stderr, "Restore [%s] -> [%s]\n", f->filename, n->filename);
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cpio_vec_insert(v, n);
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}
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}
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if (strncmp(f->filename, "overlay", 7) == 0)
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f->remove = 1;
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}
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// Some known stuff we can remove
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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 *e, *magiskinit, *init;
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// Swap magiskinit with original init
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vec_for_each(b, e) {
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if (strcmp(e->filename, ".backup/init") == 0) {
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free(e->filename);
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e->filename = strdup("init");
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init = e;
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vec_for_each(v, e) {
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if (strcmp(e->filename, "init") == 0) {
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magiskinit = e;
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vec_cur(v) = init;
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break;
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}
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}
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vec_cur(b) = NULL;
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break;
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}
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}
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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(const char *command, 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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if (strcmp(command, "test") == 0) {
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exit(cpio_test(&v));
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} else if (strcmp(command, "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(command, "stocksha1") == 0) {
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printf("%s\n", cpio_stocksha1(&v));
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return 0;
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} else if (argc >= 4 && strcmp(command, "backup") == 0) {
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struct vector *back;
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cpio_entry *e;
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back = cpio_backup(&v, argv[0], argv[2], argv[3], argc > 4 ? argv[4] : NULL);
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// Enable high compression mode
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if (strcmp(argv[1], "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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} else if (argc > 0 && strcmp(command, "rm") == 0) {
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int recursive = 0;
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if (argc == 2 && strcmp(argv[0], "-r") == 0) {
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recursive = 1;
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++argv;
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}
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cpio_rm(&v, recursive, argv[0]);
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} else if (argc == 2 && strcmp(command, "mv") == 0) {
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if (cpio_mv(&v, argv[0], argv[1]))
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return 1;
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} else if (argc == 2 && strcmp(command, "patch") == 0) {
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cpio_patch(&v, strcmp(argv[0], "true") == 0, strcmp(argv[1], "true") == 0);
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} else if (strcmp(command, "extract") == 0) {
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if (argc == 2) {
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return cpio_extract(&v, argv[0], argv[1]);
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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 (argc == 2 && strcmp(command, "mkdir") == 0) {
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cpio_mkdir(&v, strtoul(argv[0], NULL, 8), argv[1]);
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} else if (argc == 2 && strcmp(command, "ln") == 0) {
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cpio_ln(&v, argv[0], argv[1]);
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} else if (argc == 3 && strcmp(command, "add") == 0) {
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cpio_add(&v, strtoul(argv[0], NULL, 8), argv[1], argv[2]);
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} else {
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return 1;
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}
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dump_cpio(&v, incpio);
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cpio_vec_destroy(&v);
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exit(0);
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}
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