mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-12-25 21:57:39 +00:00
259 lines
6.6 KiB
C
259 lines
6.6 KiB
C
#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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void cpio_free(cpio_entry *e) {
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if (e) {
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free(e->filename);
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free(e->data);
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free(e);
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}
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}
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int cpio_find(struct vector *v, const char *entry) {
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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 (strcmp(e->filename, entry) == 0)
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return _;
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}
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return -1;
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}
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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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void cpio_vec_insert(struct vector *v, cpio_entry *n) {
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int i = cpio_find(v, n->filename);
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if (i > 0) {
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// Replace, then all is done
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cpio_free(vec_entry(v)[i]);
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vec_entry(v)[i] = n;
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return;
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}
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vec_push_back(v, n);
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}
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// Parse cpio file to a vector of cpio_entry
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#define parse_align() lseek(fd, align(lseek(fd, 0, SEEK_CUR), 4), SEEK_SET)
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void parse_cpio(struct vector *v, const char *filename) {
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int fd = open(filename, O_RDONLY);
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if (fd < 0) return;
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fprintf(stderr, "Loading cpio: [%s]\n", filename);
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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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uint32_t namesize = x8u(header.namesize);
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// f->check = x8u(header.check);
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f->filename = xmalloc(namesize);
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xxread(fd, f->filename, namesize);
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parse_align();
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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 = xmalloc(f->filesize);
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xxread(fd, f->data, f->filesize);
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parse_align();
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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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#define dump_align() write_zero(fd, align_off(lseek(fd, 0, SEEK_CUR), 4))
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void dump_cpio(struct vector *v, const char *filename) {
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fprintf(stderr, "Dump cpio: [%s]\n", filename);
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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 *e;
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int fd = creat(filename, 0644);
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vec_for_each(v, e) {
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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++, // e->ino
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e->mode,
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e->uid,
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e->gid,
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1, // e->nlink
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0, // e->mtime
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e->filesize,
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0, // e->devmajor
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0, // e->devminor
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0, // e->rdevmajor
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0, // e->rdevminor
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(uint32_t) strlen(e->filename) + 1,
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0 // e->check
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);
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xwrite(fd, header, 110);
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xwrite(fd, e->filename, strlen(e->filename) + 1);
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dump_align();
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if (e->filesize) {
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xwrite(fd, e->data, e->filesize);
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dump_align();
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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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dump_align();
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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 *e;
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vec_for_each(v, e)
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cpio_free(e);
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vec_destroy(v);
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}
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void cpio_rm(struct vector *v, int recursive, const char *entry) {
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cpio_entry *e;
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size_t len = strlen(entry);
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vec_for_each(v, e) {
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if (!e) continue;
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if (strncmp(e->filename, entry, len) == 0) {
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if ((recursive && e->filename[len] == '/') || e->filename[len] == '\0') {
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fprintf(stderr, "Remove [%s]\n", e->filename);
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cpio_free(e);
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vec_cur(v) = NULL;
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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(struct vector *v, mode_t mode, const char *entry) {
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cpio_entry *e = xcalloc(sizeof(*e), 1);
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e->mode = S_IFDIR | mode;
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e->filename = strdup(entry);
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cpio_vec_insert(v, e);
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fprintf(stderr, "Create directory [%s] (%04o)\n",entry, mode);
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}
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void cpio_ln(struct vector *v, const char *target, const char *entry) {
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cpio_entry *e = xcalloc(sizeof(*e), 1);
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e->mode = S_IFLNK;
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e->filename = strdup(entry);
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e->filesize = strlen(target);
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e->data = strdup(target);
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cpio_vec_insert(v, e);
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fprintf(stderr, "Create symlink [%s] -> [%s]\n", entry, target);
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}
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void cpio_add(struct vector *v, mode_t mode, const char *entry, const char *filename) {
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int fd = xopen(filename, O_RDONLY);
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cpio_entry *e = xcalloc(sizeof(*e), 1);
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e->mode = S_IFREG | mode;
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e->filename = strdup(entry);
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e->filesize = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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e->data = xmalloc(e->filesize);
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xxread(fd, e->data, e->filesize);
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close(fd);
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cpio_vec_insert(v, e);
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fprintf(stderr, "Add entry [%s] (%04o)\n", entry, mode);
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}
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int cpio_mv(struct vector *v, const char *from, const char *to) {
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struct cpio_entry *e;
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int f = cpio_find(v, from), t = cpio_find(v, to);
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if (f > 0) {
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if (t > 0) {
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cpio_free(vec_entry(v)[t]);
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vec_entry(v)[t] = NULL;
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}
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e = vec_entry(v)[f];
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free(e->filename);
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e->filename = strdup(to);
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return 0;
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}
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fprintf(stderr, "Cannot find entry %s\n", from);
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return 1;
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}
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int cpio_extract(struct vector *v, const char *entry, const char *filename) {
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int i = cpio_find(v, entry);
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if (i > 0) {
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cpio_entry *e = vec_entry(v)[i];
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fprintf(stderr, "Extracting [%s] to [%s]\n", entry, filename);
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if (S_ISREG(e->mode)) {
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int fd = creat(filename, e->mode & 0777);
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xwrite(fd, e->data, e->filesize);
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fchown(fd, e->uid, e->gid);
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close(fd);
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} else if (S_ISLNK(e->mode)) {
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char *target = xcalloc(e->filesize + 1, 1);
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memcpy(target, e->data, e->filesize);
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unlink(filename);
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symlink(target, filename);
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}
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return 0;
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}
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fprintf(stderr, "Cannot find the file entry [%s]\n", entry);
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return 1;
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}
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void cpio_extract_all(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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fprintf(stderr, "Extracting [%s]\n", e->filename);
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unlink(e->filename);
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rmdir(e->filename);
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if (S_ISDIR(e->mode)) {
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mkdir(e->filename, e->mode & 0777);
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} else if (S_ISREG(e->mode)) {
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int fd = creat(e->filename, e->mode & 0777);
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xwrite(fd, e->data, e->filesize);
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fchown(fd, e->uid, e->gid);
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close(fd);
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} else if (S_ISLNK(e->mode)) {
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char *target = xcalloc(e->filesize + 1, 1);
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memcpy(target, e->data, e->filesize);
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symlink(target, e->filename);
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}
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}
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}
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