mirror of
https://github.com/sheumann/hush.git
synced 2024-12-27 01:32:08 +00:00
135 lines
3.0 KiB
C
135 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) many different people. If you wrote this, please
|
|
* acknowledge your work.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "libbb.h"
|
|
|
|
|
|
/* This function parses the sort of string you might pass
|
|
* to chmod (i.e., [ugoa]{+|-|=}[rwxst] ) and returns the
|
|
* correct mode described by the string. */
|
|
extern int parse_mode(const char *s, mode_t * theMode)
|
|
{
|
|
static const mode_t group_set[] = {
|
|
S_ISUID | S_IRWXU, /* u */
|
|
S_ISGID | S_IRWXG, /* g */
|
|
S_IRWXO, /* o */
|
|
S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO /* a */
|
|
};
|
|
|
|
static const mode_t mode_set[] = {
|
|
S_IRUSR | S_IRGRP | S_IROTH, /* r */
|
|
S_IWUSR | S_IWGRP | S_IWOTH, /* w */
|
|
S_IXUSR | S_IXGRP | S_IXOTH, /* x */
|
|
S_ISUID | S_ISGID, /* s */
|
|
S_ISVTX /* t */
|
|
};
|
|
|
|
static const char group_chars[] = "ugoa";
|
|
static const char mode_chars[] = "rwxst";
|
|
|
|
const char *p;
|
|
|
|
mode_t andMode =
|
|
S_ISVTX | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
|
|
mode_t orMode = 0;
|
|
mode_t mode;
|
|
mode_t groups;
|
|
char type;
|
|
char c;
|
|
|
|
if (s==NULL) {
|
|
return (FALSE);
|
|
}
|
|
|
|
do {
|
|
mode = 0;
|
|
groups = 0;
|
|
NEXT_GROUP:
|
|
if ((c = *s++) == '\0') {
|
|
return -1;
|
|
}
|
|
for (p=group_chars ; *p ; p++) {
|
|
if (*p == c) {
|
|
groups |= group_set[(int)(p-group_chars)];
|
|
goto NEXT_GROUP;
|
|
}
|
|
}
|
|
switch (c) {
|
|
case '=':
|
|
case '+':
|
|
case '-':
|
|
type = c;
|
|
if (groups == 0) { /* The default is "all" */
|
|
groups |= S_ISUID | S_ISGID | S_ISVTX
|
|
| S_IRWXU | S_IRWXG | S_IRWXO;
|
|
}
|
|
break;
|
|
default:
|
|
if ((c < '0') || (c > '7') || (mode | groups)) {
|
|
return (FALSE);
|
|
} else {
|
|
*theMode = strtol(--s, NULL, 8);
|
|
return (TRUE);
|
|
}
|
|
}
|
|
|
|
NEXT_MODE:
|
|
if (((c = *s++) != '\0') && (c != ',')) {
|
|
for (p=mode_chars ; *p ; p++) {
|
|
if (*p == c) {
|
|
mode |= mode_set[(int)(p-mode_chars)];
|
|
goto NEXT_MODE;
|
|
}
|
|
}
|
|
break; /* We're done so break out of loop.*/
|
|
}
|
|
switch (type) {
|
|
case '=':
|
|
andMode &= ~(groups); /* Now fall through. */
|
|
case '+':
|
|
orMode |= mode & groups;
|
|
break;
|
|
case '-':
|
|
andMode &= ~(mode & groups);
|
|
orMode &= ~(mode & groups);
|
|
break;
|
|
}
|
|
} while (c == ',');
|
|
|
|
*theMode &= andMode;
|
|
*theMode |= orMode;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* END CODE */
|
|
/*
|
|
Local Variables:
|
|
c-file-style: "linux"
|
|
c-basic-offset: 4
|
|
tab-width: 4
|
|
End:
|
|
*/
|