FreeCalypso > hg > freecalypso-tools
view ffstools/tiffs-rd/basics.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 31 Dec 2022 22:55:23 +0000 |
parents | e7502631a0f9 |
children |
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line source
/* * This C module implements the "basics" of TIFFS image analysis. */ #include <sys/types.h> #include <sys/file.h> #include <sys/stat.h> #include <sys/mman.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <strings.h> #include "types.h" #include "struct.h" #include "globals.h" u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02}; read_ffs_image() { int fd; struct stat st; fd = open(imgfile, O_RDONLY); if (fd < 0) { perror(imgfile); exit(1); } fstat(fd, &st); if (!S_ISREG(st.st_mode)) { fprintf(stderr, "error: %s is not a regular file\n", imgfile); exit(1); } if (st.st_size < imgfile_offset) { fprintf(stderr, "error: offset given with -o exceeds the size of the file\n"); exit(1); } if (st.st_size - imgfile_offset < total_ffs_size) { fprintf(stderr, "error: %s is shorter than FFS size of 0x%lx bytes\n", imgfile, (u_long)total_ffs_size); exit(1); } image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, imgfile_offset); if (image == MAP_FAILED) { perror("mmap"); exit(1); } close(fd); } cmd_blkhdr() { int blk; u8 *blkhdr; read_ffs_image(); for (blk = 0; blk < total_blocks; blk++) { printf("Block %3d: ", blk); blkhdr = image + blk * eraseblk_size; if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) { printf("No TIFFS header\n"); continue; } printf("age %02X%02X, type/status %02X\n", blkhdr[7], blkhdr[6], blkhdr[8]); } exit(0); } find_inode_block() { int i, abcnt; u8 *ptr; if (index_blk_num >= 0) { if (index_blk_num >= total_blocks) { fprintf(stderr, "invalid block # given with the -a option\n"); exit(1); } ptr = image + index_blk_num * eraseblk_size; if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { fprintf(stderr, "error: block specified with -a has no TIFFS header\n"); exit(1); } if (ptr[8] != 0xAB) { fprintf(stderr, "error: block specified with -a is not an AB block\n"); exit(1); } inode_block = ptr; return(0); } abcnt = 0; for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) { if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) { fprintf(stderr, "warning: no TIFFS signature in erase block #%d (offset %x)\n", i, ptr - image); continue; } switch (ptr[8]) { case 0xAB: if (verbose) fprintf(stderr, "Found AB index in erase block #%d (offset %x)\n", i, ptr - image); index_blk_num = i; inode_block = ptr; abcnt++; continue; case 0xBD: case 0xBF: continue; } fprintf(stderr, "warning: unexpected block type/status %02X at offset %x\n", ptr[8], ptr - image); } if (!inode_block) { fprintf(stderr, "error: could not find an active inode block in %s\n", imgfile); exit(1); } if (abcnt > 1) { fprintf(stderr, "error: found more than one AB block; use -a\n"); exit(1); } return(0); } cmd_fsinfo() { read_ffs_image(); find_inode_block(); printf("Active inode block (AB) is block #%d\n", index_blk_num); alloc_inode_table(); find_root_inode(); printf("Root inode is #%x\n", root_inode); if (validate_obj_name(root_inode, 1)) { printf("Root inode (format) name: %s\n", inode_info[root_inode]->dataptr); exit(0); } else { printf("No valid name found in the root inode!\n"); exit(1); } }