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199 lines
4.3 KiB
C
199 lines
4.3 KiB
C
/*
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* Mini chmod implementation for busybox
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*
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* Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <grp.h>
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#include <pwd.h>
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#include "internal.h"
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static mode_t mode=7777;
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static const char chmod_usage[] = "[-R] MODE[,MODE]... FILE...\n"
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"Each MODE is one or more of the letters ugoa, one of the symbols +-= and\n"
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"one or more of the letters rwxst.\n\n"
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"\t-R\tchange files and directories recursively.\n";
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static int fileAction(const char *fileName)
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{
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struct stat statBuf;
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if ((stat(fileName, &statBuf) < 0) ||
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(chmod(fileName, mode)) < 0) {
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perror(fileName);
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return( FALSE);
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}
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return( TRUE);
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}
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/* [ugoa]{+|-|=}[rwxstl] */
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int parse_mode( const char* s, mode_t* or, mode_t* and, int* group_execute)
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{
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mode_t mode = 0;
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mode_t groups = S_ISVTX;
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char type;
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char c;
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do {
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for ( ; ; ) {
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switch ( c = *s++ ) {
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case '\0':
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return (FALSE);
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case 'u':
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groups |= S_ISUID|S_IRWXU;
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continue;
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case 'g':
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groups |= S_ISGID|S_IRWXG;
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continue;
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case 'o':
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groups |= S_IRWXO;
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continue;
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case 'a':
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groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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continue;
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case '+':
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case '=':
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case '-':
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type = c;
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if ( groups == S_ISVTX ) /* The default is "all" */
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groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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break;
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default:
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if ( c >= '0' && c <= '7' && mode == 0 && groups == S_ISVTX ) {
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*and = 0;
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*or = strtol(--s, 0, 010);
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return (TRUE);
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}
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else
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return (FALSE);
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}
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break;
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}
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while ( (c = *s++) != '\0' ) {
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switch ( c ) {
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case ',':
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break;
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case 'r':
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mode |= S_IRUSR|S_IRGRP|S_IROTH;
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continue;
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case 'w':
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mode |= S_IWUSR|S_IWGRP|S_IWOTH;
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continue;
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case 'x':
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mode |= S_IXUSR|S_IXGRP|S_IXOTH;
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continue;
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case 's':
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if ( group_execute != 0 && (groups & S_IRWXG) ) {
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if ( *group_execute < 0 )
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return (FALSE);
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if ( type != '-' ) {
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mode |= S_IXGRP;
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*group_execute = 1;
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}
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}
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mode |= S_ISUID|S_ISGID;
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continue;
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case 'l':
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if ( *group_execute > 0 )
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return (FALSE);
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if ( type != '-' ) {
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*and &= ~S_IXGRP;
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*group_execute = -1;
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}
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mode |= S_ISGID;
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groups |= S_ISGID;
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continue;
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case 't':
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mode |= S_ISVTX;
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continue;
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default:
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return (FALSE);
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}
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break;
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}
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switch ( type ) {
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case '=':
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*and &= ~(groups);
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/* fall through */
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case '+':
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*or |= mode & groups;
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break;
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case '-':
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*and &= ~(mode & groups);
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*or &= *and;
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break;
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}
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} while ( c == ',' );
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return (TRUE);
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}
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int chmod_main(int argc, char **argv)
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{
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int recursiveFlag=FALSE;
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mode_t andWithMode = S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;
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mode_t orWithMode = 0;
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char *invocationName=*argv;
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if (argc < 3) {
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fprintf(stderr, "Usage: %s %s", invocationName, chmod_usage);
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exit( FALSE);
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}
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argc--;
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argv++;
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/* Parse options */
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while (**argv == '-') {
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while (*++(*argv)) switch (**argv) {
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case 'R':
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recursiveFlag = TRUE;
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break;
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default:
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fprintf(stderr, "Unknown option: %c\n", **argv);
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exit( FALSE);
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}
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argc--;
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argv++;
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}
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/* Find the selected group */
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if ( parse_mode(*argv, &orWithMode, &andWithMode, 0) == FALSE ) {
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fprintf(stderr, "%s: Unknown mode: %s\n", invocationName, *argv);
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exit( FALSE);
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}
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mode &= andWithMode;
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mode |= orWithMode;
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/* Ok, ready to do the deed now */
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if (argc <= 1) {
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fprintf(stderr, "%s: too few arguments", invocationName);
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exit( FALSE);
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}
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while (argc-- > 1) {
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argv++;
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recursiveAction( *argv, recursiveFlag, TRUE, fileAction, fileAction);
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}
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exit(TRUE);
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}
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