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mls.c
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mls.c
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/******************************************************************************
* @file mls.c
*****************************************************************************/
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "common.h"
#include "msdos.h"
#include "report.h"
#ifndef PATH_MAX
# define PATH_MAX 2048
#endif
struct mls_state {
char **dirs;
size_t nb_dirs;
const char *outfile;
unsigned long offset;
};
static FILE *ifp;
struct dir_info {
unsigned int current_cluster;
unsigned char current_sector;
unsigned char current_entry;
unsigned char *scratch;
unsigned char flags;
};
static struct mls_state *state = 0;
static const char *program_name = 0;
static struct msdos_boot_sector bs;
static int size_fat = 0;
static unsigned int cluster_count = 0;
static unsigned int data_area = 0;
static unsigned int info_sector = 0;
static unsigned int number_of_fats = 0;
static unsigned int reserved_sectors = 0;
static unsigned int root_cluster = 0;
static unsigned int root_dir = 0;
static unsigned int root_entries = 0;
static unsigned int sectors_per_cluster = 0;
static unsigned int sectors_per_fat = 0;
static unsigned int total_sectors = 0;
struct option {
const char *name;
int index, flags;
};
#define OPTION_NO_ARG 0x0001
#define OPTION_HAS_ARG 0x0002
enum options {
OPTION_IGNORED = 1,
OPTION_HELP,
OPTION_INPUT,
OPTION_OFFSET
};
static struct option opts[] = {
{ "i", OPTION_INPUT, OPTION_HAS_ARG },
{ "-help", OPTION_HELP, OPTION_NO_ARG },
{ "-offset", OPTION_OFFSET, OPTION_HAS_ARG },
{ 0, 0, 0 }
};
static int strstart (const char *val, const char **str) {
const char *p = val;
const char *q = *str;
while (*p != '\0') {
if (*p != *q) {
return 0;
}
++p;
++q;
}
*str = q;
return 1;
}
static void print_help (int exitval) {
if (!program_name) {
goto _exit;
}
fprintf (stderr, "Usage: %s [options] dirname\n\n", program_name);
fprintf (stderr, "Options:\n\n");
fprintf (stderr, " Short options:\n\n");
fprintf (stderr, " -i Specify the input target.\n");
fprintf (stderr, "\n");
fprintf (stderr, " Long options:\n\n");
fprintf (stderr, " --help Show this help information then exit.\n");
fprintf (stderr, " --offset SECTOR Read the filesystem starting at SECTOR.\n");
_exit:
exit (exitval);
}
static void *xmalloc (size_t size) {
void *ptr = malloc (size);
if (ptr == NULL && size) {
report_at (program_name, 0, REPORT_ERROR, "memory full (malloc)");
exit (EXIT_FAILURE);
}
memset (ptr, 0, size);
return ptr;
}
static void *xrealloc (void *ptr, size_t size) {
void *new_ptr = realloc (ptr, size);
if (new_ptr == NULL && size) {
report_at (program_name, 0, REPORT_ERROR, "memory full (realloc)");
exit (EXIT_FAILURE);
}
return new_ptr;
}
static char *xstrdup (const char *str) {
char *ptr = xmalloc (strlen (str) + 1);
strcpy (ptr, str);
return ptr;
}
static void dynarray_add (void *ptab, size_t *nb_ptr, void *data) {
int nb, nb_alloc;
void **pp;
nb = *nb_ptr;
pp = *(void ***) ptab;
if ((nb & (nb - 1)) == 0) {
if (!nb) {
nb_alloc = 1;
} else {
nb_alloc = nb * 2;
}
pp = xrealloc (pp, nb_alloc * sizeof (void *));
*(void ***) ptab = pp;
}
pp[nb++] = data;
*nb_ptr = nb;
}
static void parse_args (int *pargc, char ***pargv, int optind) {
char **argv = *pargv;
int argc = *pargc;
struct option *popt;
const char *optarg, *r;
if (argc == optind) {
print_help (EXIT_SUCCESS);
}
while (optind < argc) {
r = argv[optind++];
if (r[0] != '-' || r[1] == '\0') {
dynarray_add (&state->dirs, &state->nb_dirs, xstrdup (r));
continue;
}
for (popt = opts; popt; ++popt) {
const char *p1 = popt->name;
const char *r1 = (r + 1);
if (!p1) {
report_at (program_name, 0, REPORT_ERROR, "invalid option -- '%s'", r);
exit (EXIT_FAILURE);
}
if (!strstart (p1, &r1)) {
continue;
}
optarg = r1;
if (popt->flags & OPTION_HAS_ARG) {
if (*optarg == '\0') {
if (optind >= argc) {
report_at (program_name, 0, REPORT_ERROR, "argument to '%s' is missing", r);
exit (EXIT_FAILURE);
}
optarg = argv[optind++];
}
} else if (*optarg != '\0') {
continue;
}
break;
}
switch (popt->index) {
case OPTION_HELP: {
print_help (EXIT_SUCCESS);
break;
}
case OPTION_INPUT: {
if (state->outfile) {
report_at (program_name, 0, REPORT_ERROR, "multiple output files provided");
exit (EXIT_FAILURE);
}
state->outfile = xstrdup (optarg);
break;
}
case OPTION_OFFSET: {
long conversion;
char *temp;
errno = 0;
conversion = strtol (optarg, &temp, 0);
if (!*optarg || isspace ((int) *optarg) || errno || *temp) {
report_at (program_name, 0, REPORT_ERROR, "bad number for offset (%s)", optarg);
exit (EXIT_FAILURE);
}
if (conversion < 0 || (unsigned long) conversion > UINT_MAX) {
report_at (program_name, 0, REPORT_ERROR, "offset must be between 0 and %u", UINT_MAX);
exit (EXIT_FAILURE);
}
state->offset = (unsigned long) conversion;
break;
}
default: {
report_at (program_name, 0, REPORT_ERROR, "unsupported option '%s'", r);
exit (EXIT_FAILURE);
}
}
}
}
static int seekto (long offset) {
return fseek (ifp, (state->offset * 512) + offset, SEEK_SET);
}
static int get_next_entry (struct dir_info *di, struct msdos_dirent *de);
static int open_dir (const char *target, struct dir_info *di);
static unsigned int get_fat_entry (unsigned char *scratch, unsigned int cluster);
static int canonical_to_dir (char *dest, const char *src) {
static const char invalid_chars[] = "\"*+,./:;<=>?[\\]|";
int i, j;
int namelen = 0, dots = 0, extlen = 0;
memset (dest, ' ', 11);
if (*src == '\0' || *src == '.') {
return -1;
}
for (j = i = 0; *src != '\0'; i++) {
int c = (unsigned char) *src++;
if (c == '/' || c == '\\') {
break;
}
if (i >= 12) {
return -1;
}
if (i == 0 && c == 0xE5) {
/**
* 0xE5 in the first character of the name is a marker for delected files,
* it needs to be translated to 0x05.
*/
c = 0x05;
} else if (c == '.') {
if (dots++) {
return -1;
}
j = 8;
continue;
}
if (c <= 0x20 || strchr (invalid_chars, c)) {
return -1;
}
if (dots) {
if (++extlen > 3) {
return -1;
}
} else {
if (++namelen > 8) {
return -1;
}
}
if (c >= 'a' && c <= 'z') {
c -= 'a' - 'A';
}
dest[j++] = c;
}
return 0;
}
static int get_next_entry (struct dir_info *di, struct msdos_dirent *de) {
unsigned long offset;
if (di->current_entry >= 512 / sizeof (*de)) {
di->current_entry = 0;
di->current_sector++;
if (di->current_cluster == 0) {
unsigned long offset;
if (di->current_sector * (512 / sizeof (*de)) >= root_entries) {
return -1;
}
offset = (unsigned long) root_dir + di->current_sector;
if (seekto (offset * 512) || fread (di->scratch, 512, 1, ifp) != 1) {
return -1;
}
} else {
if (di->current_sector >= sectors_per_cluster) {
di->current_sector = 0;
if ((size_fat == 12 && di->current_cluster >= 0x0FF7) || (size_fat == 16 && di->current_cluster >= 0xFFF7) || (size_fat == 32 && di->current_cluster >= 0x0FFFFFF7)) {
if (!(di->flags & 0x01)) {
return -1;
}
return 1;
}
di->current_cluster = get_fat_entry (di->scratch, di->current_cluster);
}
offset = (unsigned long) data_area;
offset += ((di->current_cluster - 2) * sectors_per_cluster);
offset += di->current_sector;
if (seekto (offset * 512) || fread (di->scratch, 512, 1, ifp) != 1) {
return -1;
}
}
}
memcpy (de, &(((struct msdos_dirent *) di->scratch)[di->current_entry]), sizeof (*de));
if (de->name[0] == 0) {
if (di->flags & 0x01) {
return 0;
}
return -1;
}
if (de->name[0] == 0x05) {
de->name[0] = 0xE5;
return 0;
}
di->current_entry++;
return 0;
}
static int open_dir (const char *target, struct dir_info *di) {
di->flags = 0;
if (!strlen ((char *) target) || (strlen ((char *) target) == 1 && (target[0] == '/' || target[0] == '\\'))) {
unsigned long offset;
if (size_fat == 32) {
di->current_cluster = root_cluster;
di->current_entry = 0;
di->current_sector = 0;
offset = (unsigned long) data_area + ((di->current_cluster - 2) * sectors_per_cluster);
} else {
di->current_cluster = 0;
di->current_entry = 0;
di->current_sector = 0;
offset = (unsigned long) root_dir;
}
if (seekto (offset * 512) || fread (di->scratch, 512, 1, ifp) != 1) {
return -1;
}
} else {
unsigned char tmpfn[12];
unsigned char *ptr;
struct msdos_dirent de;
unsigned int result;
unsigned long offset;
if (size_fat == 32) {
di->current_cluster = root_cluster;
di->current_entry = 0;
di->current_sector = 0;
offset = (unsigned long) data_area + ((di->current_cluster - 2) * sectors_per_cluster);
} else {
di->current_cluster = 0;
di->current_entry = 0;
di->current_sector = 0;
offset = (unsigned long) root_dir;
}
if (seekto (offset * 512) || fread (di->scratch, 512, 1, ifp) != 1) {
return -1;
}
ptr = (unsigned char *) target;
while ((*ptr == '/' || *ptr == '\\') && *ptr) {
ptr++;
}
while (*ptr) {
if (canonical_to_dir ((char *) tmpfn, (char *) ptr) < 0) {
fprintf (stderr, "Failed to convert to 8:3\n");
return -1;
}
de.name[0] = 0;
do {
result = get_next_entry (di, &de);
} while (!result && memcmp (de.name, tmpfn, 11));
if (!memcmp (de.name, tmpfn, 11) && (de.attr & ATTR_DIR) == ATTR_DIR) {
unsigned long offset;
di->current_cluster = (unsigned int) de.startlo[0] | ((unsigned int) de.startlo[1]) << 8 | ((unsigned int) de.starthi[0]) << 16 | ((unsigned int) de.starthi[1]) << 24;
di->current_entry = 0;
di->current_sector = 0;
offset = (unsigned long) (data_area + ((di->current_cluster - 2) * sectors_per_cluster));
if (seekto (offset * 512)) {
return -1;
}
if (fread (di->scratch, 512, 1, ifp) != 1) {
return -1;
}
} else if (!memcmp (de.name, tmpfn, 11) && !(de.attr & ATTR_DIR)) {
return -1;
}
while (*ptr != '/' && *ptr != '\\' && *ptr) {
ptr++;
}
if (*ptr == '/' || *ptr == '\\') {
ptr++;
}
}
if (!di->current_cluster) {
return -1;
}
}
return 0;
}
static unsigned int get_fat_entry (unsigned char *scratch, unsigned int cluster) {
unsigned int offset, sector, result;
if (size_fat == 12) {
offset = cluster + (cluster / 2);
} else if (size_fat == 16) {
offset = cluster * 2;
} else if (size_fat == 32) {
offset = cluster * 4;
} else {
return 0x0FFFFFF7;
}
sector = (offset / 512) + reserved_sectors;
if (seekto ((unsigned long) sector * 512) || fread (scratch, 512, 1, ifp) != 1) {
return 0x0FFFFFF7;
}
offset %= 512;
if (size_fat == 12) {
if (offset == 511) {
result = (unsigned int) scratch[offset];
sector++;
if (seekto ((unsigned long) sector * 512) || fread (scratch, 512, 1, ifp) != 1) {
return 0x0FFFFFF7;
}
result |= ((unsigned int) scratch[0]) << 8;
} else {
result = (unsigned int) scratch[offset] | ((unsigned int) scratch[offset + 1]) << 8;
}
if (cluster & 1) {
result = result >> 4;
} else {
result = result & 0x0FFF;
}
} else if (size_fat == 16) {
result = (unsigned int) scratch[offset] | ((unsigned int) scratch[offset + 1]) << 8;
} else if (size_fat == 32) {
result = ((unsigned int) scratch[offset] | ((unsigned int) scratch[offset + 1]) << 8 | ((unsigned int) scratch[offset + 2]) << 16 | ((unsigned int) scratch[offset + 3]) << 24) & 0x0FFFFFFF;
} else {
result = 0x0FFFFFF7;
}
return result;
}
int main (int argc, char **argv) {
unsigned char *scratch;
char *target, filename[13];
struct dir_info di;
struct msdos_dirent de;
unsigned int bytes, timestamp;
size_t i, j, k;
if (argc && *argv) {
char *p;
program_name = *argv;
if ((p = strrchr (program_name, '/'))) {
program_name = (p + 1);
}
}
state = xmalloc (sizeof (*state));
parse_args (&argc, &argv, 1);
if (!state->outfile) {
print_help (EXIT_FAILURE);
}
if (state->nb_dirs == 0) {
dynarray_add (&state->dirs, &state->nb_dirs, "/");
}
if ((ifp = fopen (state->outfile, "rb")) == NULL) {
report_at (program_name, 0, REPORT_ERROR, "faild to open '%s' for reading", state->outfile);
return EXIT_FAILURE;
}
if (seekto ((unsigned long) 0) || fread (&bs, sizeof (bs), 1, ifp) != 1) {
report_at (program_name, 0, REPORT_ERROR, "failed whilst reading boot sector");
fclose (ifp);
return EXIT_FAILURE;
}
if (bs.boot_jump[0] != 0xEB || bs.boot_jump[1] < 0x16 || bs.boot_jump[2] != 0x90) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
sectors_per_cluster = (unsigned int) bs.sectors_per_cluster;
reserved_sectors = (unsigned int) bs.reserved_sectors[0] | (((unsigned int) bs.reserved_sectors[1]) << 8);
number_of_fats = (unsigned int) bs.no_fats;
root_entries = (unsigned int) bs.root_entries[0] | (((unsigned int) bs.root_entries[1]) << 8);
total_sectors = (unsigned int) bs.total_sectors16[0] | (((unsigned int) bs.total_sectors16[1]) << 8);
sectors_per_fat = (unsigned int) bs.sectors_per_fat16[0] | (((unsigned int) bs.sectors_per_fat16[1]) << 8);
if (!sectors_per_cluster || !reserved_sectors || !number_of_fats) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
if (!root_entries) {
if (bs.boot_jump[1] < 0x58) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
root_cluster = (unsigned int) bs.fat32.root_cluster[0] | (((unsigned int) bs.fat32.root_cluster[1]) << 8) | (((unsigned int) bs.fat32.root_cluster[2]) << 16) | (((unsigned int) bs.fat32.root_cluster[3]) << 24);
if (!root_cluster) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
}
if (!total_sectors) {
if (bs.boot_jump[1] < 0x22) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
total_sectors = (unsigned int) bs.total_sectors32[0] | (((unsigned int) bs.total_sectors32[1]) << 8) | (((unsigned int) bs.total_sectors32[2]) << 16) | (((unsigned int) bs.total_sectors32[3]) << 24);
if (!total_sectors) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
}
if (!sectors_per_fat) {
if (bs.boot_jump[1] < 0x58) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
sectors_per_fat = (unsigned int) bs.fat32.sectors_per_fat32[0] | (((unsigned int) bs.fat32.sectors_per_fat32[1]) << 8) | (((unsigned int) bs.fat32.sectors_per_fat32[2]) << 16) | (((unsigned int) bs.fat32.sectors_per_fat32[3]) << 24);
if (!sectors_per_fat) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
}
if (root_entries) {
root_dir = reserved_sectors + (sectors_per_fat * 2);
data_area = root_dir + (((root_entries * 32) + (512 - 1)) / 512);
} else {
data_area = reserved_sectors + (sectors_per_fat * 2);
/*root_dir = data_area + ((root_cluster - 2) * sectors_per_cluster);*/
/*root_dir = root_cluster;*/
}
cluster_count = (total_sectors - data_area) / sectors_per_cluster;
if (bs.boot_jump[1] == 0x58) {
info_sector = (unsigned int) bs.fat32.info_sector[0] | (((unsigned int) bs.fat32.info_sector[1]) << 8);
if (!info_sector) {
report_at (program_name, 0, REPORT_ERROR, "%s does not have a valid FAT boot sector", state->outfile);
fclose (ifp);
return EXIT_FAILURE;
}
size_fat = 32;
} else if (cluster_count <= MAX_CLUST_12) {
size_fat = 12;
} else if (cluster_count >= MIN_CLUST_16 && cluster_count <= MAX_CLUST_16) {
size_fat = 16;
} else {
report_at (program_name, 0, REPORT_ERROR, "FAT is not 12, 16 or 32 bits");
fclose (ifp);
return EXIT_FAILURE;
}
if (!(scratch = (unsigned char *) malloc (512))) {
report_at (program_name, 0, REPORT_ERROR, "Out of memory");
fclose (ifp);
return EXIT_FAILURE;
}
di.scratch = scratch;
for (i = 0; i < state->nb_dirs; i++) {
target = state->dirs[i];
if (*target == '/' || *target == '\\') {
target++;
}
if (open_dir ((char *) target, &di) < 0) {
fprintf (stderr, "failed to open directory\n");
return -1;
}
if (state->nb_dirs > 1) {
if (!*target) {
printf ("/\n\n");
} else {
printf ("%s:\n\n", target);
}
}
while (!get_next_entry (&di, &de)) {
/*if (!de.name[0] || de.name[0] == 0xE5 || (de.attr & ATTR_LONG_NAME) == ATTR_LONG_NAME) {*/
if (!de.name[0] || de.name[0] == 0xE5) {
continue;
}
if ((de.attr & ATTR_VOLUME_ID) == ATTR_VOLUME_ID) {
continue;
}
memset (filename, 0, 13);
for (j = 0, k = 0; j < 11; ++j) {
if (j < 8 && de.name[j] == ' ') {
if ((de.attr & ATTR_DIR) != ATTR_DIR && k > 0 && filename[k - 1] != '.') {
filename[k++] = '.';
}
} else {
if (j == 8 && (de.attr & ATTR_DIR) != ATTR_DIR && filename[k - 1] != '.') {
filename[k++] = '.';
}
filename[k++] = de.name[j];
}
}
if (state->nb_dirs > 1) {
printf (" ");
}
printf ("%s", filename);
while (k < 12) {
printf (" ");
k++;
}
if ((de.attr & ATTR_DIR) == ATTR_DIR) {
printf (" <DIR> ");
} else {
printf (" ");
}
if ((de.attr & ATTR_DIR) == ATTR_DIR) {
printf (" ");
} else {
bytes = (unsigned int) de.size[0] | (((unsigned int) de.size[1]) << 8) | (((unsigned int) de.size[2]) << 16) | (((unsigned int) de.size[3]) << 24);
printf ("%10u", bytes);
}
timestamp = (unsigned short) de.date[0] | (((unsigned short) de.date[1]) << 8);
printf (" %04d-%02d-%02d", ((timestamp >> 9) & 0x3f) + 1980, (timestamp >> 5) & 0x0f, timestamp & 0x1f);
timestamp = (unsigned short) de.time[0] | (((unsigned short) de.time[1]) << 8);
printf (" %02d:%02d:%02d", (timestamp >> 11) & 0x3f, (timestamp >> 5) & 0x3f, (timestamp & 0x1f) << 1);
printf ("\n");
}
if (state->nb_dirs > 1 && i < state->nb_dirs - 1) {
printf ("\n");
}
}
free (scratch);
fclose (ifp);
return EXIT_SUCCESS;
}