busybox/chmod_chown_chgrp.c

/*
 * Mini chown/chmod/chgrp implementation for busybox
 *
 * Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
 *
 * 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 <grp.h>
#include <pwd.h>
#include "internal.h"


static int uid=-1;
static int gid=0;
static int whichApp;
static char* invocationName=NULL;
static mode_t mode=0644;


#define CHGRP_APP   1
#define CHOWN_APP   2
#define CHMOD_APP   3

static const char chgrp_usage[] = "[OPTION]... GROUP FILE...\n"
    "Change the group membership of each FILE to GROUP.\n"
    "\n\tOptions:\n" "\t-R\tchange files and directories recursively\n";
static const char chown_usage[] = "[OPTION]...  OWNER[.[GROUP] FILE...\n"
    "Change the owner and/or group of each FILE to OWNER and/or GROUP.\n"
    "\n\tOptions:\n" "\t-R\tchange files and directories recursively\n";
static const char chmod_usage[] = "[-R] MODE[,MODE]... FILE...\n"
"Each MODE is one or more of the letters ugoa, one of the symbols +-= and\n"
"one or more of the letters rwxst.\n\n"
 "\t-R\tchange files and directories recursively.\n";



static int fileAction(const char *fileName, struct stat* statbuf)
{
    switch (whichApp) {
	case CHGRP_APP:
	case CHOWN_APP:
	    if (chown(fileName, ((whichApp==CHOWN_APP)? uid: statbuf->st_uid), gid) < 0)
		return( TRUE);
	case CHMOD_APP:
	    fprintf(stderr, "%s, %d\n", fileName, mode);
	    if (chmod(fileName, mode))
		return( TRUE);
    }
    perror(fileName);
    return( FALSE);
}

int chmod_chown_chgrp_main(int argc, char **argv)
{
    struct group *grp;
    struct passwd *pwd;
    int recursiveFlag=FALSE;
    char *groupName;
    mode_t andWithMode= S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO;

    whichApp = (strcmp(*argv, "chown")==0)? CHOWN_APP : (strcmp(*argv, "chmod")==0)? CHMOD_APP : CHGRP_APP; 

    if (argc < 2) {
	fprintf(stderr, "Usage: %s %s", *argv, 
		(whichApp==TRUE)? chown_usage : chgrp_usage);
	exit( FALSE);
    }
    invocationName=*argv;
    argc--;
    argv++;

    /* Parse options */
    while (**argv == '-') {
	while (*++(*argv)) switch (**argv) {
	    case 'R':
		recursiveFlag = TRUE;
		break;
	    default:
		fprintf(stderr, "Unknown option: %c\n", **argv);
		exit( FALSE);
	}
	argc--;
	argv++;
    }
    
    if ( whichApp == CHMOD_APP ) {
	/* Find the specified modes */
	if ( parse_mode(*argv, &mode) == FALSE ) {
	    fprintf(stderr, "%s: Unknown mode: %s\n", invocationName, *argv);
	    exit( FALSE);
	}
	//mode &= andWithMode;
	fprintf(stderr, "mode %d\n", mode);
    } else {

	/* Find the selected group */
	groupName = strchr(*argv, '.');
	if ( whichApp==TRUE && groupName )
	    *groupName++ = '\0';
	else
	    groupName = *argv;
	grp = getgrnam(groupName);
	if (grp == NULL) {
	    fprintf(stderr, "%s: Unknown group name: %s\n", invocationName, groupName);
	    exit( FALSE);
	}
	gid = grp->gr_gid;

	/* Find the selected user (if appropriate)  */
	if (whichApp==TRUE) {
	    pwd = getpwnam(*argv);
	    if (pwd == NULL) {
		fprintf(stderr, "%s: Unknown user name: %s\n", invocationName, *argv);
		exit( FALSE);
	    }
	    uid = pwd->pw_uid;
	}
    }
    
    /* Ok, ready to do the deed now */
    if (argc <= 1) {
	fprintf(stderr, "%s: too few arguments", invocationName);
	exit( FALSE);
    }
    while (argc-- > 1) {
	if (recursiveAction( *(++argv), recursiveFlag, TRUE, fileAction, fileAction)==FALSE)
	    exit( FALSE);
    }
    exit(TRUE);
}