mirror of git://git.suckless.org/sbase
162 lines
3.0 KiB
C
162 lines
3.0 KiB
C
/* See LICENSE file for copyright and license details. */
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
#include "../util.h"
|
|
|
|
mode_t
|
|
getumask(void)
|
|
{
|
|
mode_t mask = umask(0);
|
|
umask(mask);
|
|
return mask;
|
|
}
|
|
|
|
mode_t
|
|
parsemode(const char *str, mode_t mode, mode_t mask)
|
|
{
|
|
char *end;
|
|
const char *p = str;
|
|
int octal, op;
|
|
mode_t who, perm, clear;
|
|
|
|
octal = strtol(str, &end, 8);
|
|
if (*end == '\0') {
|
|
if (octal < 0 || octal > 07777)
|
|
eprintf("%s: invalid mode\n", str);
|
|
mode = 0;
|
|
if (octal & 04000) mode |= S_ISUID;
|
|
if (octal & 02000) mode |= S_ISGID;
|
|
if (octal & 01000) mode |= S_ISVTX;
|
|
if (octal & 00400) mode |= S_IRUSR;
|
|
if (octal & 00200) mode |= S_IWUSR;
|
|
if (octal & 00100) mode |= S_IXUSR;
|
|
if (octal & 00040) mode |= S_IRGRP;
|
|
if (octal & 00020) mode |= S_IWGRP;
|
|
if (octal & 00010) mode |= S_IXGRP;
|
|
if (octal & 00004) mode |= S_IROTH;
|
|
if (octal & 00002) mode |= S_IWOTH;
|
|
if (octal & 00001) mode |= S_IXOTH;
|
|
return mode;
|
|
}
|
|
next:
|
|
/* first, determine which bits we will be modifying */
|
|
for (who = 0; *p; p++) {
|
|
switch (*p) {
|
|
/* masks */
|
|
case 'u':
|
|
who |= S_IRWXU|S_ISUID;
|
|
continue;
|
|
case 'g':
|
|
who |= S_IRWXG|S_ISGID;
|
|
continue;
|
|
case 'o':
|
|
who |= S_IRWXO;
|
|
continue;
|
|
case 'a':
|
|
who |= S_IRWXU|S_ISUID|S_IRWXG|S_ISGID|S_IRWXO;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
if (who) {
|
|
clear = who;
|
|
} else {
|
|
clear = S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO;
|
|
who = ~mask;
|
|
}
|
|
while (*p) {
|
|
switch (*p) {
|
|
/* opers */
|
|
case '=':
|
|
case '+':
|
|
case '-':
|
|
op = (int)*p;
|
|
break;
|
|
default:
|
|
eprintf("%s: invalid mode\n", str);
|
|
}
|
|
|
|
perm = 0;
|
|
switch (*++p) {
|
|
/* copy */
|
|
case 'u':
|
|
if (mode & S_IRUSR)
|
|
perm |= S_IRUSR|S_IRGRP|S_IROTH;
|
|
if (mode & S_IWUSR)
|
|
perm |= S_IWUSR|S_IWGRP|S_IWOTH;
|
|
if (mode & S_IXUSR)
|
|
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
|
|
if (mode & S_ISUID)
|
|
perm |= S_ISUID|S_ISGID;
|
|
p++;
|
|
break;
|
|
case 'g':
|
|
if (mode & S_IRGRP)
|
|
perm |= S_IRUSR|S_IRGRP|S_IROTH;
|
|
if (mode & S_IWGRP)
|
|
perm |= S_IWUSR|S_IWGRP|S_IWOTH;
|
|
if (mode & S_IXGRP)
|
|
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
|
|
if (mode & S_ISGID)
|
|
perm |= S_ISUID|S_ISGID;
|
|
p++;
|
|
break;
|
|
case 'o':
|
|
if (mode & S_IROTH)
|
|
perm |= S_IRUSR|S_IRGRP|S_IROTH;
|
|
if (mode & S_IWOTH)
|
|
perm |= S_IWUSR|S_IWGRP|S_IWOTH;
|
|
if (mode & S_IXOTH)
|
|
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
|
|
p++;
|
|
break;
|
|
default:
|
|
for (; *p; p++) {
|
|
switch (*p) {
|
|
/* modes */
|
|
case 'r':
|
|
perm |= S_IRUSR|S_IRGRP|S_IROTH;
|
|
break;
|
|
case 'w':
|
|
perm |= S_IWUSR|S_IWGRP|S_IWOTH;
|
|
break;
|
|
case 'x':
|
|
perm |= S_IXUSR|S_IXGRP|S_IXOTH;
|
|
break;
|
|
case 's':
|
|
perm |= S_ISUID|S_ISGID;
|
|
break;
|
|
case 't':
|
|
perm |= S_ISVTX;
|
|
break;
|
|
default:
|
|
goto apply;
|
|
}
|
|
}
|
|
}
|
|
|
|
apply:
|
|
/* apply */
|
|
switch (op) {
|
|
case '=':
|
|
mode &= ~clear;
|
|
/* fallthrough */
|
|
case '+':
|
|
mode |= perm & who;
|
|
break;
|
|
case '-':
|
|
mode &= ~(perm & who);
|
|
break;
|
|
}
|
|
/* if we hit a comma, move on to the next clause */
|
|
if (*p == ',') {
|
|
p++;
|
|
goto next;
|
|
}
|
|
}
|
|
return mode;
|
|
}
|