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-rw-r--r--toolbox/ls.c588
1 files changed, 588 insertions, 0 deletions
diff --git a/toolbox/ls.c b/toolbox/ls.c
new file mode 100644
index 0000000..9a89dd4
--- /dev/null
+++ b/toolbox/ls.c
@@ -0,0 +1,588 @@
+#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);
+}
generated by cgit v1.1 at 2024-12-22 22:53:18 +0000