mirror of
https://github.com/topjohnwu/Magisk.git
synced 2024-11-24 10:35:26 +00:00
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
#include <unistd.h>
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#include <stdio.h>
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#include <sys/mman.h>
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#include "utils.h"
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void mmap_ro(const char *filename, void **buf, size_t *size) {
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int fd = xopen(filename, O_RDONLY);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = xmmap(NULL, *size, PROT_READ, MAP_SHARED, fd, 0);
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close(fd);
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}
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void mmap_rw(const char *filename, void **buf, size_t *size) {
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int fd = xopen(filename, O_RDWR);
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*size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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*buf = xmmap(NULL, *size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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close(fd);
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}
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void write_zero(int fd, size_t size) {
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size_t pos = lseek(fd, 0, SEEK_CUR);
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ftruncate(fd, pos + size);
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lseek(fd, pos + size, SEEK_SET);
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}
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void mem_align(size_t *pos, size_t align) {
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size_t mask = align - 1;
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if (*pos & mask) {
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*pos += align - (*pos & mask);
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}
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}
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void file_align(int fd, size_t align, int out) {
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size_t pos = lseek(fd, 0, SEEK_CUR);
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size_t mask = align - 1;
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size_t off;
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if (pos & mask) {
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off = align - (pos & mask);
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if (out) {
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write_zero(fd, off);
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} else {
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lseek(fd, pos + off, SEEK_SET);
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}
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}
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}
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int open_new(const char *filename) {
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return xopen(filename, O_WRONLY | O_CREAT | O_TRUNC, 0644);
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}
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void *patch_init_rc(char *data, uint32_t *size) {
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int injected = 0;
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char *new_data = xmalloc(*size + 23);
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char *old_data = data;
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uint32_t pos = 0;
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for (char *tok = strsep(&old_data, "\n"); tok; tok = strsep(&old_data, "\n")) {
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if (!injected && strncmp(tok, "import", 6) == 0) {
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if (strstr(tok, "init.magisk.rc")) {
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injected = 1;
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} else {
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fprintf(stderr, "Inject [import /init.magisk.rc] to [init.rc]\n");
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strcpy(new_data + pos, "import /init.magisk.rc\n");
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pos += 23;
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injected = 1;
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}
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} else if (strstr(tok, "selinux.reload_policy")) {
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continue;
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}
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// Copy the line
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strcpy(new_data + pos, tok);
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pos += strlen(tok);
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new_data[pos++] = '\n';
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}
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*size = pos;
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return new_data;
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}
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int check_verity_pattern(const char *s) {
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int pos = 0;
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if (s[0] == ',') ++pos;
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if (strncmp(s + pos, "verify", 6) != 0) return -1;
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pos += 6;
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if (s[pos] == '=') {
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while (s[pos] != '\0' && s[pos] != ' ' && s[pos] != '\n' && s[pos] != ',') ++pos;
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}
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return pos;
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}
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int check_encryption_pattern(const char *s) {
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const char *encrypt_list[] = { "forceencrypt", "forcefdeorfbe", "fileencryptioninline", "fileencryption", NULL };
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for (int i = 0 ; encrypt_list[i]; ++i) {
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int len = strlen(encrypt_list[i]);
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if (strncmp(s, encrypt_list[i], len) == 0)
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return len;
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}
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return -1;
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}
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