254 lines
4.9 KiB
C
Executable file
254 lines
4.9 KiB
C
Executable file
/* chmod - Change file modes Author: V. Archer */
|
|
|
|
/* Copyright 1991 by Vincent Archer
|
|
* You may freely redistribute this software, in source or binary
|
|
* form, provided that you do not alter this copyright mention in any
|
|
* way.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <minix/minlib.h>
|
|
#include <stdio.h>
|
|
|
|
#ifndef S_ISLNK
|
|
#define S_ISLNK(mode) 0
|
|
#define lstat stat
|
|
#endif
|
|
|
|
#define USR_MODES (S_ISUID|S_IRWXU)
|
|
#define GRP_MODES (S_ISGID|S_IRWXG)
|
|
#define EXE_MODES (S_IXUSR|S_IXGRP|S_IXOTH)
|
|
#ifdef S_ISVTX
|
|
#define ALL_MODES (USR_MODES|GRP_MODES|S_IRWXO|S_ISVTX)
|
|
#else
|
|
#define ALL_MODES (USR_MODES|GRP_MODES|S_IRWXO)
|
|
#endif
|
|
|
|
|
|
/* Common variables */
|
|
char *symbolic;
|
|
mode_t new_mode, u_mask;
|
|
int rflag, errors;
|
|
struct stat st;
|
|
char path[PATH_MAX + 1];
|
|
|
|
_PROTOTYPE(int main, (int argc, char **argv));
|
|
_PROTOTYPE(mode_t parsemode, (char *symbolic, mode_t oldmode));
|
|
_PROTOTYPE(int do_change, (char *name));
|
|
_PROTOTYPE(void usage, (void));
|
|
|
|
/* Parse a P1003.2 4.7.7-conformant symbolic mode. */
|
|
mode_t parsemode(char *symbolic, mode_t oldmode)
|
|
{
|
|
mode_t who, mask, newmode, tmpmask;
|
|
char action;
|
|
|
|
newmode = oldmode & ALL_MODES;
|
|
while (*symbolic) {
|
|
who = 0;
|
|
for (; *symbolic; symbolic++) {
|
|
if (*symbolic == 'a') {
|
|
who |= ALL_MODES;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'u') {
|
|
who |= USR_MODES;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'g') {
|
|
who |= GRP_MODES;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'o') {
|
|
who |= S_IRWXO;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (!*symbolic || *symbolic == ',') usage();
|
|
while (*symbolic) {
|
|
if (*symbolic == ',') break;
|
|
switch (*symbolic) {
|
|
default:
|
|
usage();
|
|
case '+':
|
|
case '-':
|
|
case '=': action = *symbolic++;
|
|
}
|
|
mask = 0;
|
|
for (; *symbolic; symbolic++) {
|
|
if (*symbolic == 'u') {
|
|
tmpmask = newmode & S_IRWXU;
|
|
mask |= tmpmask | (tmpmask << 3) | (tmpmask << 6);
|
|
symbolic++;
|
|
break;
|
|
}
|
|
if (*symbolic == 'g') {
|
|
tmpmask = newmode & S_IRWXG;
|
|
mask |= tmpmask | (tmpmask >> 3) | (tmpmask << 3);
|
|
symbolic++;
|
|
break;
|
|
}
|
|
if (*symbolic == 'o') {
|
|
tmpmask = newmode & S_IRWXO;
|
|
mask |= tmpmask | (tmpmask >> 3) | (tmpmask >> 6);
|
|
symbolic++;
|
|
break;
|
|
}
|
|
if (*symbolic == 'r') {
|
|
mask |= S_IRUSR | S_IRGRP | S_IROTH;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'w') {
|
|
mask |= S_IWUSR | S_IWGRP | S_IWOTH;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'x') {
|
|
mask |= EXE_MODES;
|
|
continue;
|
|
}
|
|
if (*symbolic == 's') {
|
|
mask |= S_ISUID | S_ISGID;
|
|
continue;
|
|
}
|
|
if (*symbolic == 'X') {
|
|
if (S_ISDIR(oldmode) || (oldmode & EXE_MODES))
|
|
mask |= EXE_MODES;
|
|
continue;
|
|
}
|
|
#ifdef S_ISVTX
|
|
if (*symbolic == 't') {
|
|
mask |= S_ISVTX;
|
|
who |= S_ISVTX;
|
|
continue;
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
switch (action) {
|
|
case '=':
|
|
if (who)
|
|
newmode &= ~who;
|
|
else
|
|
newmode = 0;
|
|
case '+':
|
|
if (who)
|
|
newmode |= who & mask;
|
|
else
|
|
newmode |= mask & (~u_mask);
|
|
break;
|
|
case '-':
|
|
if (who)
|
|
newmode &= ~(who & mask);
|
|
else
|
|
newmode &= ~mask | u_mask;
|
|
}
|
|
}
|
|
if (*symbolic) symbolic++;
|
|
}
|
|
return(newmode);
|
|
}
|
|
|
|
|
|
/* Main module. The single option possible (-R) does not warrant a call to
|
|
* the getopt() stuff.
|
|
*/
|
|
int main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int ex_code = 0;
|
|
|
|
argc--;
|
|
argv++;
|
|
|
|
if (argc && strcmp(*argv, "-R") == 0) {
|
|
argc--;
|
|
argv++;
|
|
rflag = 1;
|
|
} else
|
|
rflag = 0;
|
|
|
|
if (!argc--) usage();
|
|
if (!strcmp(argv[0], "--")) { /* Allow chmod -- -r, as in Draft11 example */
|
|
if (!argc--) usage();
|
|
argv++;
|
|
}
|
|
symbolic = *argv++;
|
|
if (!argc) usage();
|
|
|
|
if (*symbolic >= '0' && *symbolic <= '7') {
|
|
new_mode = 0;
|
|
while (*symbolic >= '0' && *symbolic <= '7')
|
|
new_mode = (new_mode << 3) | (*symbolic++ & 07);
|
|
if (*symbolic) usage();
|
|
new_mode &= ALL_MODES;
|
|
symbolic = (char *) 0;
|
|
} else
|
|
u_mask = umask(0);
|
|
|
|
while (argc--)
|
|
if (do_change(*argv++)) ex_code = 1;
|
|
return(ex_code);
|
|
}
|
|
|
|
|
|
/* Apply a mode change to a given file system element. */
|
|
int do_change(name)
|
|
char *name;
|
|
{
|
|
mode_t m;
|
|
DIR *dirp;
|
|
struct dirent *entp;
|
|
char *namp;
|
|
|
|
if (lstat(name, &st)) {
|
|
perror(name);
|
|
return(1);
|
|
}
|
|
if (S_ISLNK(st.st_mode) && rflag) return(0); /* Note: violates POSIX. */
|
|
if (!symbolic)
|
|
m = new_mode;
|
|
else
|
|
m = parsemode(symbolic, st.st_mode);
|
|
if (chmod(name, m)) {
|
|
perror(name);
|
|
errors = 1;
|
|
} else
|
|
errors = 0;
|
|
|
|
if (S_ISDIR(st.st_mode) && rflag) {
|
|
if (!(dirp = opendir(name))) {
|
|
perror(name);
|
|
return(1);
|
|
}
|
|
if (name != path) strcpy(path, name);
|
|
namp = path + strlen(path);
|
|
*namp++ = '/';
|
|
while (entp = readdir(dirp))
|
|
if (entp->d_name[0] != '.' ||
|
|
(entp->d_name[1] &&
|
|
(entp->d_name[1] != '.' || entp->d_name[2]))) {
|
|
strcpy(namp, entp->d_name);
|
|
errors |= do_change(path);
|
|
}
|
|
closedir(dirp);
|
|
*--namp = '\0';
|
|
}
|
|
return(errors);
|
|
}
|
|
|
|
|
|
/* Display Posix prototype */
|
|
void usage()
|
|
{
|
|
std_err("Usage: chmod [-R] mode file...\n");
|
|
exit(1);
|
|
}
|