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