mirror of
https://github.com/palera1n/palera1n.git
synced 2026-10-21 01:37:02 +02:00
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
#include <palerain.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <assert.h>
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#include <getopt.h>
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#include <sys/mman.h>
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#include <errno.h>
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int override_file(override_file_t *finfo, niarelap_file_t** orig, unsigned int *orig_len, char *filename) {
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int ret = 0;
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int fd = open(filename, O_RDONLY);
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LOG(LOG_VERBOSE5, "override_file() called!");
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if (fd == -1) {
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LOG(LOG_ERROR, "Cannot open file %s: %d (%s)", filename, errno, strerror(errno));
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return errno;
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}
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LOG(LOG_VERBOSE5, "override_file: opened %s!", filename);
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struct stat st;
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ret = fstat(fd, &st);
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if (ret) {
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LOG(LOG_ERROR, "Cannot fstat fd from file %s: %d (%s)", filename, errno, strerror(errno));
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return errno;
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}
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LOG(LOG_VERBOSE5, "override_file: fstat fd %d succeeded!", fd);
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void *addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (addr == MAP_FAILED) {
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LOG(LOG_ERROR, "Failed to map file %s: %d (%s)", filename, errno, strerror(errno));
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return errno;
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}
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LOG(LOG_VERBOSE5, "override_file: Override file mapped successfully");
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finfo->magic = OVERRIDE_MAGIC;
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finfo->fd = fd;
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finfo->len = (unsigned int)st.st_size;;
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finfo->ptr = *(niarelap_file_t*)addr;
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finfo->orig_len = *orig_len;
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finfo->orig_ptr = **orig;
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*orig = (niarelap_file_t*)addr;
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*orig_len = (unsigned int)st.st_size;
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LOG(LOG_VERBOSE5, "override_file() finished!");
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return 0;
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}
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