mirror of
https://github.com/topjohnwu/Magisk.git
synced 2026-08-01 00:20:54 -07:00
Separate cpio logic from MagiskBoot
This commit is contained in:
topjohnwu
@@ -0,0 +1,407 @@
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "cpio.h"
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#include "logging.h"
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#include "utils.h"
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static uint32_t x8u(char *hex) {
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uint32_t val, inpos = 8, outpos;
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char pattern[6];
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while (*hex == '0') {
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hex++;
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if (!--inpos) return 0;
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}
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// Because scanf gratuitously treats %*X differently than printf does.
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sprintf(pattern, "%%%dx%%n", inpos);
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sscanf(hex, pattern, &val, &outpos);
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if (inpos != outpos) LOGE("bad cpio header\n");
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return val;
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}
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static void cpio_free(cpio_entry *f) {
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if (f) {
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free(f->filename);
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free(f->data);
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free(f);
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}
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}
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static void cpio_vec_insert(struct vector *v, cpio_entry *n) {
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cpio_entry *f;
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vec_for_each(v, f) {
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if (strcmp(f->filename, n->filename) == 0) {
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// Replace, then all is done
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cpio_free(f);
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vec_cur(v) = n;
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return;
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}
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}
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vec_push_back(v, n);
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}
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static int cpio_cmp(const void *a, const void *b) {
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return strcmp((*(cpio_entry **) a)->filename, (*(cpio_entry **) b)->filename);
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}
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// Parse cpio file to a vector of cpio_entry
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void parse_cpio(const char *filename, struct vector *v) {
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fprintf(stderr, "Loading cpio: [%s]\n\n", filename);
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int fd = xopen(filename, O_RDONLY);
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cpio_newc_header header;
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cpio_entry *f;
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while(xxread(fd, &header, 110) != -1) {
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f = xcalloc(sizeof(*f), 1);
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// f->ino = x8u(header.ino);
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f->mode = x8u(header.mode);
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f->uid = x8u(header.uid);
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f->gid = x8u(header.gid);
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// f->nlink = x8u(header.nlink);
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// f->mtime = x8u(header.mtime);
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f->filesize = x8u(header.filesize);
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// f->devmajor = x8u(header.devmajor);
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// f->devminor = x8u(header.devminor);
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// f->rdevmajor = x8u(header.rdevmajor);
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// f->rdevminor = x8u(header.rdevminor);
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f->namesize = x8u(header.namesize);
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// f->check = x8u(header.check);
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f->filename = xmalloc(f->namesize);
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xxread(fd, f->filename, f->namesize);
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file_align(fd, 4, 0);
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if (strcmp(f->filename, ".") == 0 || strcmp(f->filename, "..") == 0) {
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cpio_free(f);
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continue;
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}
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if (strcmp(f->filename, "TRAILER!!!") == 0) {
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cpio_free(f);
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break;
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}
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if (f->filesize) {
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f->data = malloc(f->filesize);
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xxread(fd, f->data, f->filesize);
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file_align(fd, 4, 0);
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}
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vec_push_back(v, f);
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}
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close(fd);
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}
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void dump_cpio(const char *filename, struct vector *v) {
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fprintf(stderr, "\nDump cpio: [%s]\n\n", filename);
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int fd = creat(filename, 0644);
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unsigned inode = 300000;
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char header[111];
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// Sort by name
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vec_sort(v, cpio_cmp);
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cpio_entry *f;
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vec_for_each(v, f) {
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if (f->remove) continue;
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sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x",
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inode++, // f->ino
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f->mode,
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f->uid,
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f->gid,
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1, // f->nlink
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0, // f->mtime
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f->filesize,
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0, // f->devmajor
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0, // f->devminor
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0, // f->rdevmajor
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0, // f->rdevminor
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f->namesize,
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0 // f->check
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);
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xwrite(fd, header, 110);
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xwrite(fd, f->filename, f->namesize);
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file_align(fd, 4, 1);
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if (f->filesize) {
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xwrite(fd, f->data, f->filesize);
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file_align(fd, 4, 1);
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}
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}
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// Write trailer
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sprintf(header, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x", inode++, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 11, 0);
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xwrite(fd, header, 110);
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xwrite(fd, "TRAILER!!!\0", 11);
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file_align(fd, 4, 1);
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close(fd);
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}
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void cpio_vec_destroy(struct vector *v) {
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// Free each cpio_entry
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cpio_entry *f;
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vec_for_each(v, f) {
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cpio_free(f);
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}
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vec_destroy(v);
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}
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void cpio_rm(int recursive, const char *entry, struct vector *v) {
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cpio_entry *f;
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vec_for_each(v, f) {
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if (strncmp(f->filename, entry, strlen(entry)) == 0) {
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char next = f->filename[strlen(entry)];
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if ((recursive && next == '/') || next == '\0') {
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if (!f->remove) {
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fprintf(stderr, "Remove [%s]\n", f->filename);
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f->remove = 1;
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}
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if (!recursive) return;
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}
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}
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}
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}
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void cpio_mkdir(mode_t mode, const char *entry, struct vector *v) {
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cpio_entry *f = xcalloc(sizeof(*f), 1);
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f->mode = S_IFDIR | mode;
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f->namesize = strlen(entry) + 1;
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f->filename = strdup(entry);
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cpio_vec_insert(v, f);
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fprintf(stderr, "Create directory [%s] (%04o)\n",entry, mode);
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}
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void cpio_add(mode_t mode, const char *entry, const char *filename, struct vector *v) {
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int fd = xopen(filename, O_RDONLY);
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cpio_entry *f = xcalloc(sizeof(*f), 1);
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f->mode = S_IFREG | mode;
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f->namesize = strlen(entry) + 1;
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f->filename = strdup(entry);
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f->filesize = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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f->data = xmalloc(f->filesize);
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xxread(fd, f->data, f->filesize);
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close(fd);
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cpio_vec_insert(v, f);
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fprintf(stderr, "Add entry [%s] (%04o)\n", entry, mode);
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}
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void cpio_mv(struct vector *v, const char *from, const char *to) {
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struct cpio_entry *f, *t;
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vec_for_each(v, f) {
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if (strcmp(f->filename, from) == 0) {
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fprintf(stderr, "Move [%s] -> [%s]\n", from, to);
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vec_for_each(v, t) {
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if (strcmp(t->filename, to) == 0) {
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t->remove = 1;
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break;
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}
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}
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free(f->filename);
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f->namesize = strlen(to) + 1;
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f->filename = strdup(to);
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return;
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}
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}
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fprintf(stderr, "Cannot find entry %s\n", from);
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exit(1);
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}
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void cpio_test(struct vector *v) {
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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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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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ret |= OTHER_PATCH;
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// Already find other files, abort
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exit(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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exit(ret);
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}
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void cpio_extract(const char *entry, const char *filename, struct vector *v) {
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cpio_entry *f;
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vec_for_each(v, f) {
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if (strcmp(f->filename, entry) == 0 && S_ISREG(f->mode)) {
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fprintf(stderr, "Extracting [%s] to [%s]\n\n", entry, filename);
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int fd = creat(filename, 0644);
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xwrite(fd, f->data, f->filesize);
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fchmod(fd, f->mode);
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fchown(fd, f->uid, f->gid);
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close(fd);
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exit(0);
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}
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}
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LOGE("Cannot find the file entry [%s]\n", entry);
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}
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void cpio_backup(const char *orig, const char *sha1, struct vector *v) {
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struct vector o_body, *o = &o_body, bak;
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cpio_entry *m, *n, *rem, *cksm;
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char buf[PATH_MAX];
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int res, doBak;
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if (sha1) cksm = xcalloc(sizeof(*cksm), 1);
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vec_init(o);
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vec_init(&bak);
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m = xcalloc(sizeof(*m), 1);
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m->filename = strdup(".backup");
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m->namesize = strlen(m->filename) + 1;
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m->mode = S_IFDIR;
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vec_push_back(&bak, m);
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m = xcalloc(sizeof(*m), 1);
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m->filename = strdup(".backup/.magisk");
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m->namesize = strlen(m->filename) + 1;
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m->mode = S_IFREG;
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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->namesize = strlen(rem->filename) + 1;
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rem->mode = S_IFREG;
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vec_push_back(&bak, rem);
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if (sha1) vec_push_back(&bak, cksm);
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parse_cpio(orig, o);
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// Remove possible backups in original ramdisk
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cpio_rm(1, ".backup", o);
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cpio_rm(1, ".backup", v);
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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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if (sha1) {
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fprintf(stderr, "Save SHA1: [%s] -> [.backup/.sha1]\n", sha1);
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cksm->filename = strdup(".backup/.sha1");
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cksm->namesize = strlen(cksm->filename) + 1;
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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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// 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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doBak = 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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doBak = 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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doBak = 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 + n->namesize);
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memcpy(rem->data + rem->filesize, n->filename, n->namesize);
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rem->filesize += n->namesize;
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fprintf(stderr, "Record new entry: [%s] -> [.backup/.rmlist]\n", n->filename);
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}
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if (doBak) {
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m->namesize += 8;
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m->filename = realloc(m->filename, m->namesize);
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strcpy(buf, m->filename);
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sprintf(m->filename, ".backup/%s", buf);
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fprintf(stderr, "[%s] -> [%s]\n", buf, m->filename);
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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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// Add the backup files to the original ramdisk
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vec_for_each(&bak, m) {
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vec_push_back(v, m);
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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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}
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int cpio_restore(struct vector *v) {
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cpio_entry *f, *n;
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int ret = 1;
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vec_for_each(v, f) {
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if (strstr(f->filename, ".backup") != NULL) {
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ret = 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(0, f->data + pos, v);
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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->namesize -= 8;
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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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}
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// Some known stuff we can remove
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cpio_rm(0, "sbin/magic_mask.sh", v);
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cpio_rm(0, "init.magisk.rc", v);
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cpio_rm(0, "magisk", v);
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return ret;
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}
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void 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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printf("%s\n", sha1);
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return;
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}
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}
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} else if (strcmp(f->filename, ".backup/.sha1") == 0) {
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printf("%s\n", f->data);
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}
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}
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}
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