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#include <dirent.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <selinux/selinux.h>
// simple dynamic array of strings.
typedef struct {
int count;
int capacity;
void** items;
} strlist_t;
#define STRLIST_INITIALIZER { 0, 0, NULL }
/* Used to iterate over a strlist_t
* _list :: pointer to strlist_t object
* _item :: name of local variable name defined within the loop with
* type 'char*'
* _stmnt :: C statement executed in each iteration
*
* This macro is only intended for simple uses. Do not add or remove items
* to/from the list during iteration.
*/
#define STRLIST_FOREACH(_list,_item,_stmnt) \
do { \
int _nn_##__LINE__ = 0; \
for (;_nn_##__LINE__ < (_list)->count; ++ _nn_##__LINE__) { \
char* _item = (char*)(_list)->items[_nn_##__LINE__]; \
_stmnt; \
} \
} while (0)
static void dynarray_reserve_more( strlist_t *a, int count ) {
int old_cap = a->capacity;
int new_cap = old_cap;
const int max_cap = INT_MAX/sizeof(void*);
void** new_items;
int new_count = a->count + count;
if (count <= 0)
return;
if (count > max_cap - a->count)
abort();
new_count = a->count + count;
while (new_cap < new_count) {
old_cap = new_cap;
new_cap += (new_cap >> 2) + 4;
if (new_cap < old_cap || new_cap > max_cap) {
new_cap = max_cap;
}
}
new_items = realloc(a->items, new_cap*sizeof(void*));
if (new_items == NULL)
abort();
a->items = new_items;
a->capacity = new_cap;
}
void strlist_init( strlist_t *list ) {
list->count = list->capacity = 0;
list->items = NULL;
}
// append a new string made of the first 'slen' characters from 'str'
// followed by a trailing zero.
void strlist_append_b( strlist_t *list, const void* str, size_t slen ) {
char *copy = malloc(slen+1);
memcpy(copy, str, slen);
copy[slen] = '\0';
if (list->count >= list->capacity)
dynarray_reserve_more(list, 1);
list->items[list->count++] = copy;
}
// append the copy of a given input string to a strlist_t.
void strlist_append_dup( strlist_t *list, const char *str) {
strlist_append_b(list, str, strlen(str));
}
// note: strlist_done will free all the strings owned by the list.
void strlist_done( strlist_t *list ) {
STRLIST_FOREACH(list, string, free(string));
free(list->items);
list->items = NULL;
list->count = list->capacity = 0;
}
static int strlist_compare_strings(const void* a, const void* b) {
const char *sa = *(const char **)a;
const char *sb = *(const char **)b;
return strcmp(sa, sb);
}
/* sort the strings in a given list (using strcmp) */
void strlist_sort( strlist_t *list ) {
if (list->count > 0) {
qsort(list->items, (size_t)list->count, sizeof(void*), strlist_compare_strings);
}
}
// bits for flags argument
#define LIST_LONG (1 << 0)
#define LIST_ALL (1 << 1)
#define LIST_RECURSIVE (1 << 2)
#define LIST_DIRECTORIES (1 << 3)
#define LIST_SIZE (1 << 4)
#define LIST_LONG_NUMERIC (1 << 5)
#define LIST_CLASSIFY (1 << 6)
#define LIST_MACLABEL (1 << 7)
#define LIST_INODE (1 << 8)
// fwd
static int listpath(const char *name, int flags);
static char mode2kind(mode_t mode)
{
switch(mode & S_IFMT){
case S_IFSOCK: return 's';
case S_IFLNK: return 'l';
case S_IFREG: return '-';
case S_IFDIR: return 'd';
case S_IFBLK: return 'b';
case S_IFCHR: return 'c';
case S_IFIFO: return 'p';
default: return '?';
}
}
void strmode(mode_t mode, char *out)
{
*out++ = mode2kind(mode);
*out++ = (mode & 0400) ? 'r' : '-';
*out++ = (mode & 0200) ? 'w' : '-';
if(mode & 04000) {
*out++ = (mode & 0100) ? 's' : 'S';
} else {
*out++ = (mode & 0100) ? 'x' : '-';
}
*out++ = (mode & 040) ? 'r' : '-';
*out++ = (mode & 020) ? 'w' : '-';
if(mode & 02000) {
*out++ = (mode & 010) ? 's' : 'S';
} else {
*out++ = (mode & 010) ? 'x' : '-';
}
*out++ = (mode & 04) ? 'r' : '-';
*out++ = (mode & 02) ? 'w' : '-';
if(mode & 01000) {
*out++ = (mode & 01) ? 't' : 'T';
} else {
*out++ = (mode & 01) ? 'x' : '-';
}
*out = 0;
}
static void user2str(uid_t uid, char *out, size_t out_size)
{
struct passwd *pw = getpwuid(uid);
if(pw) {
strlcpy(out, pw->pw_name, out_size);
} else {
snprintf(out, out_size, "%d", uid);
}
}
static void group2str(gid_t gid, char *out, size_t out_size)
{
struct group *gr = getgrgid(gid);
if(gr) {
strlcpy(out, gr->gr_name, out_size);
} else {
snprintf(out, out_size, "%d", gid);
}
}
static int show_total_size(const char *dirname, DIR *d, int flags)
{
struct dirent *de;
char tmp[1024];
struct stat s;
int sum = 0;
/* run through the directory and sum up the file block sizes */
while ((de = readdir(d)) != 0) {
if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
continue;
if (de->d_name[0] == '.' && (flags & LIST_ALL) == 0)
continue;
if (strcmp(dirname, "/") == 0)
snprintf(tmp, sizeof(tmp), "/%s", de->d_name);
else
snprintf(tmp, sizeof(tmp), "%s/%s", dirname, de->d_name);
if (lstat(tmp, &s) < 0) {
fprintf(stderr, "stat failed on %s: %s\n", tmp, strerror(errno));
rewinddir(d);
return -1;
}
sum += s.st_blocks / 2;
}
printf("total %d\n", sum);
rewinddir(d);
return 0;
}
static int listfile_size(const char *path, const char *filename, struct stat *s,
int flags)
{
if(!s || !path) {
return -1;
}
/* blocks are 512 bytes, we want output to be KB */
if ((flags & LIST_SIZE) != 0) {
printf("%lld ", (long long)s->st_blocks / 2);
}
if ((flags & LIST_CLASSIFY) != 0) {
char filetype = mode2kind(s->st_mode);
if (filetype != 'l') {
printf("%c ", filetype);
} else {
struct stat link_dest;
if (!stat(path, &link_dest)) {
printf("l%c ", mode2kind(link_dest.st_mode));
} else {
fprintf(stderr, "stat '%s' failed: %s\n", path, strerror(errno));
printf("l? ");
}
}
}
printf("%s\n", filename);
return 0;
}
static int listfile_long(const char *path, struct stat *s, int flags)
{
char date[32];
char mode[16];
char user[32];
char group[32];
const char *name;
if(!s || !path) {
return -1;
}
/* name is anything after the final '/', or the whole path if none*/
name = strrchr(path, '/');
if(name == 0) {
name = path;
} else {
name++;
}
strmode(s->st_mode, mode);
if (flags & LIST_LONG_NUMERIC) {
snprintf(user, sizeof(user), "%u", s->st_uid);
snprintf(group, sizeof(group), "%u", s->st_gid);
} else {
user2str(s->st_uid, user, sizeof(user));
group2str(s->st_gid, group, sizeof(group));
}
strftime(date, 32, "%Y-%m-%d %H:%M", localtime((const time_t*)&s->st_mtime));
date[31] = 0;
// 12345678901234567890123456789012345678901234567890123456789012345678901234567890
// MMMMMMMM UUUUUUUU GGGGGGGGG XXXXXXXX YYYY-MM-DD HH:MM NAME (->LINK)
switch(s->st_mode & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
printf("%s %-8s %-8s %3d, %3d %s %s\n",
mode, user, group,
major(s->st_rdev), minor(s->st_rdev),
date, name);
break;
case S_IFREG:
printf("%s %-8s %-8s %8lld %s %s\n",
mode, user, group, (long long)s->st_size, date, name);
break;
case S_IFLNK: {
char linkto[256];
ssize_t len;
len = readlink(path, linkto, 256);
if(len < 0) return -1;
if(len > 255) {
linkto[252] = '.';
linkto[253] = '.';
linkto[254] = '.';
linkto[255] = 0;
} else {
linkto[len] = 0;
}
printf("%s %-8s %-8s %s %s -> %s\n",
mode, user, group, date, name, linkto);
break;
}
default:
printf("%s %-8s %-8s %s %s\n",
mode, user, group, date, name);
}
return 0;
}
static int listfile_maclabel(const char *path, struct stat *s)
{
char mode[16];
char user[32];
char group[32];
char *maclabel = NULL;
const char *name;
if(!s || !path) {
return -1;
}
/* name is anything after the final '/', or the whole path if none*/
name = strrchr(path, '/');
if(name == 0) {
name = path;
} else {
name++;
}
lgetfilecon(path, &maclabel);
if (!maclabel) {
return -1;
}
strmode(s->st_mode, mode);
user2str(s->st_uid, user, sizeof(user));
group2str(s->st_gid, group, sizeof(group));
switch(s->st_mode & S_IFMT) {
case S_IFLNK: {
char linkto[256];
ssize_t len;
len = readlink(path, linkto, sizeof(linkto));
if(len < 0) return -1;
if((size_t)len > sizeof(linkto)-1) {
linkto[sizeof(linkto)-4] = '.';
linkto[sizeof(linkto)-3] = '.';
linkto[sizeof(linkto)-2] = '.';
linkto[sizeof(linkto)-1] = 0;
} else {
linkto[len] = 0;
}
printf("%s %-8s %-8s %s %s -> %s\n",
mode, user, group, maclabel, name, linkto);
break;
}
default:
printf("%s %-8s %-8s %s %s\n",
mode, user, group, maclabel, name);
}
free(maclabel);
return 0;
}
static int listfile(const char *dirname, const char *filename, int flags)
{
struct stat s;
if ((flags & (LIST_LONG | LIST_SIZE | LIST_CLASSIFY | LIST_MACLABEL | LIST_INODE)) == 0) {
printf("%s\n", filename);
return 0;
}
char tmp[4096];
const char* pathname = filename;
if (dirname != NULL) {
snprintf(tmp, sizeof(tmp), "%s/%s", dirname, filename);
pathname = tmp;
} else {
pathname = filename;
}
if(lstat(pathname, &s) < 0) {
fprintf(stderr, "lstat '%s' failed: %s\n", pathname, strerror(errno));
return -1;
}
if(flags & LIST_INODE) {
printf("%8llu ", (unsigned long long)s.st_ino);
}
if ((flags & LIST_MACLABEL) != 0) {
return listfile_maclabel(pathname, &s);
} else if ((flags & LIST_LONG) != 0) {
return listfile_long(pathname, &s, flags);
} else /*((flags & LIST_SIZE) != 0)*/ {
return listfile_size(pathname, filename, &s, flags);
}
}
static int listdir(const char *name, int flags)
{
char tmp[4096];
DIR *d;
struct dirent *de;
strlist_t files = STRLIST_INITIALIZER;
d = opendir(name);
if(d == 0) {
fprintf(stderr, "opendir failed, %s\n", strerror(errno));
return -1;
}
if ((flags & LIST_SIZE) != 0) {
show_total_size(name, d, flags);
}
while((de = readdir(d)) != 0){
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) continue;
if(de->d_name[0] == '.' && (flags & LIST_ALL) == 0) continue;
strlist_append_dup(&files, de->d_name);
}
strlist_sort(&files);
STRLIST_FOREACH(&files, filename, listfile(name, filename, flags));
strlist_done(&files);
if (flags & LIST_RECURSIVE) {
strlist_t subdirs = STRLIST_INITIALIZER;
rewinddir(d);
while ((de = readdir(d)) != 0) {
struct stat s;
int err;
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
continue;
if (de->d_name[0] == '.' && (flags & LIST_ALL) == 0)
continue;
if (!strcmp(name, "/"))
snprintf(tmp, sizeof(tmp), "/%s", de->d_name);
else
snprintf(tmp, sizeof(tmp), "%s/%s", name, de->d_name);
/*
* If the name ends in a '/', use stat() so we treat it like a
* directory even if it's a symlink.
*/
if (tmp[strlen(tmp)-1] == '/')
err = stat(tmp, &s);
else
err = lstat(tmp, &s);
if (err < 0) {
perror(tmp);
closedir(d);
return -1;
}
if (S_ISDIR(s.st_mode)) {
strlist_append_dup(&subdirs, tmp);
}
}
strlist_sort(&subdirs);
STRLIST_FOREACH(&subdirs, path, {
printf("\n%s:\n", path);
listdir(path, flags);
});
strlist_done(&subdirs);
}
closedir(d);
return 0;
}
static int listpath(const char *name, int flags)
{
struct stat s;
int err;
/*
* If the name ends in a '/', use stat() so we treat it like a
* directory even if it's a symlink.
*/
if (name[strlen(name)-1] == '/')
err = stat(name, &s);
else
err = lstat(name, &s);
if (err < 0) {
perror(name);
return -1;
}
if ((flags & LIST_DIRECTORIES) == 0 && S_ISDIR(s.st_mode)) {
if (flags & LIST_RECURSIVE)
printf("\n%s:\n", name);
return listdir(name, flags);
} else {
/* yeah this calls stat() again*/
return listfile(NULL, name, flags);
}
}
int ls_main(int argc, char **argv)
{
int flags = 0;
if(argc > 1) {
int i;
int err = 0;
strlist_t files = STRLIST_INITIALIZER;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
/* an option ? */
const char *arg = argv[i]+1;
while (arg[0]) {
switch (arg[0]) {
case 'l': flags |= LIST_LONG; break;
case 'n': flags |= LIST_LONG | LIST_LONG_NUMERIC; break;
case 's': flags |= LIST_SIZE; break;
case 'R': flags |= LIST_RECURSIVE; break;
case 'd': flags |= LIST_DIRECTORIES; break;
case 'Z': flags |= LIST_MACLABEL; break;
case 'a': flags |= LIST_ALL; break;
case 'F': flags |= LIST_CLASSIFY; break;
case 'i': flags |= LIST_INODE; break;
default:
fprintf(stderr, "%s: Unknown option '-%c'. Aborting.\n", "ls", arg[0]);
exit(1);
}
arg++;
}
} else {
/* not an option ? */
strlist_append_dup(&files, argv[i]);
}
}
if (files.count > 0) {
STRLIST_FOREACH(&files, path, {
if (listpath(path, flags) != 0) {
err = EXIT_FAILURE;
}
});
strlist_done(&files);
return err;
}
}
// list working directory if no files or directories were specified
return listpath(".", flags);
}
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