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/*
* UNG's Not GNU
*
* Copyright (c) 2011, Jakob Kaivo <jakob@kaivo.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
const char *chmod_desc = "change the file modes";
const char *chmod_inv = "chmod [-R] mode file...";
#define USER 1 << 0
#define GROUP 1 << 1
#define OTHER 1 << 2
#define ALL (USER | GROUP | OTHER)
static int recursive = 0;
static mode_t modeadd = 0;
static mode_t modesub = 0;
static mode_t modeabs = 0;
static mode_t absmask = 0;
static int _chmod (const char*);
int nftw_chmod (const char *p, const struct stat *sb, int typeflag, struct FTW *f)
{
_chmod (p);
}
static int _chmod (const char *p)
{
struct stat st;
if (lstat (p, &st) != 0) {
perror (p);
return 1;
}
printf ("Current: %04o\n", st.st_mode & 07777);
printf ("Add: %04o\n", modeadd);
printf ("Sub: %04o\n", modesub);
printf ("Abs: %04o (%04o)\n", modeabs, absmask);
// FIXME :(
if (chmod (p, ((((st.st_mode | modeadd) ^ modesub) ^ absmask) | modeabs)) != 0)
perror (p);
return 0;
}
void chmod_set (int who, char rel, char mode)
{
int bits = 0;
int special = 0;
int nmode = 0;
if (mode == 'r') {
bits = 4;
} else if (mode == 'w') {
bits = 2;
} else if (mode == 'x') {
bits = 1;
} else if (mode == 's') {
if (who & USER)
special += 4;
if (who & GROUP)
special += 2;
if (who & (USER | GROUP) == 0) {
printf ("Must specify u or g for SUID or SGID\n");
exit (1);
}
} else if (mode == 't') {
if (who & OTHER) {
special += 1;
} else {
printf ("Sticky only works for other\n");
exit (1);
}
} else {
printf ("Unknown mode: %c\n", mode);
exit (1);
}
nmode = (special << 9) + (who & USER ? bits << 6 : 0) + (who & GROUP ? bits << 3 : 0) + (who & OTHER ? bits : 0);
if (rel == '-')
modesub |= nmode;
else if (rel == '+')
modeadd |= nmode;
else if (rel == '=') {
modeabs |= nmode;
absmask |= (who & USER ? 0700 : 0) + (who & GROUP ? 070 : 0) + (who & OTHER ? 07 : 0);
}
}
void chmod_parse (char *s)
{
char *end;
modeabs = strtol (s, &end, 8);
if (end != NULL && strlen (end) > 0) {
int i;
int who = 0;
char rel = '/';
for (i = 0; i < strlen (end); i++) {
if (who == 0 || rel == '/') {
switch (end[i]) {
case 'u': who |= USER; break;
case 'g': who |= GROUP; break;
case 'o': who |= OTHER; break;
case 'a': who |= ALL; break;
case '=': if (who == 0) who |= ALL; rel = '='; break;
case '+': if (who == 0) who |= ALL; rel = '+'; break;
case '-': if (who == 0) who |= ALL; rel = '-'; break;
default: printf ("Unknown mode: %c\n", end[i]); exit(1);
}
} else if (end[i] == ',') {
who = 0; rel = '/';
} else {
chmod_set (who, rel, end[i]);
}
}
} else {
absmask = 07777;
}
}
int
main (int argc, char **argv)
{
int c;
while ((c = getopt (argc, argv, ":R")) != -1) {
switch (c) {
case 'R':
recursive = 1;
break;
default:
return 1;
}
}
if (optind >= argc - 1)
return 1;
chmod_parse (argv[optind++]);
while (optind < argc) {
if (recursive)
nftw (argv[optind], nftw_chmod, 1024, 0);
else
_chmod (argv[optind]);
optind++;
}
return 0;
}
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