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