chmod_chown_chgrp.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini chown/chmod/chgrp implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1999,2000 by Lineo, inc.
   7  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  */
  24
  25 #include "internal.h"
  26 #define BB_DECLARE_EXTERN
  27 #define bb_need_invalid_option
  28 #define bb_need_too_few_args
  29 #include "messages.c"
  30
  31 #include <stdio.h>
  32 #include <grp.h>
  33 #include <pwd.h>
  34
  35
  36 static long uid = -1;
  37 static long gid = -1;
  38 static int whichApp;
  39 static char *theMode = NULL;
  40
  41
  42 #define CHGRP_APP   1
  43 #define CHOWN_APP   2
  44 #define CHMOD_APP   3
  45
  46 static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
  47 {
  48         switch (whichApp) {
  49         case CHGRP_APP:
  50         case CHOWN_APP:
  51 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
  52                 if (lchown
  53                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  54                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  55 #else
  56                 if (chown
  57                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  58                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  59 #endif
  60                 {
  61                         return (TRUE);
  62                 }
  63                 break;
  64         case CHMOD_APP:
  65                 /* Parse the specified modes */
  66                 if (parse_mode(theMode, &(statbuf->st_mode)) == FALSE) {
  67                         fatalError( "unknown mode: %s\n", theMode);
  68                 }
  69                 if (chmod(fileName, statbuf->st_mode) == 0)
  70                         return (TRUE);
  71                 break;
  72         }
  73         perror(fileName);
  74         return (FALSE);
  75 }
  76
  77 int chmod_chown_chgrp_main(int argc, char **argv)
  78 {
  79         int recursiveFlag = FALSE;
  80         char *groupName=NULL;
  81         char *p=NULL;
  82         const char *appUsage;
  83
  84         whichApp = (strcmp(applet_name, "chown") == 0)?
  85                         CHOWN_APP : (strcmp(applet_name, "chmod") == 0)?
  86                                 CHMOD_APP : CHGRP_APP;
  87
  88         appUsage = (whichApp == CHOWN_APP)?
  89                         chown_usage : (whichApp == CHMOD_APP) ? chmod_usage : chgrp_usage;
  90
  91         if (argc < 2)
  92                 usage(appUsage);
  93         argv++;
  94
  95         /* Parse options */
  96         while (--argc >= 0 && *argv && (**argv == '-')) {
  97                 while (*++(*argv)) {
  98                         switch (**argv) {
  99                                 case 'R':
 100                                         recursiveFlag = TRUE;
 101                                         break;
 102                                 default:
 103                                         errorMsg(invalid_option, **argv);
 104                                         usage(appUsage);
 105                         }
 106                 }
 107                 argv++;
 108         }
 109
 110         if (argc == 0 || *argv == NULL) {
 111                 errorMsg(too_few_args);
 112                 usage(appUsage);
 113         }
 114
 115         if (whichApp == CHMOD_APP) {
 116                 theMode = *argv;
 117         } else {
 118
 119                 /* Find the selected group */
 120                 if (whichApp == CHGRP_APP) {
 121                         groupName = *argv;
 122                         gid = strtoul(groupName, &p, 10);       /* maybe it's already numeric */
 123                         if (groupName == p)
 124                                 gid = my_getgrnam(groupName);
 125                         if (gid == -1)
 126                                 goto bad_group;
 127                 } else {
 128                         groupName = strchr(*argv, '.');
 129                         if (groupName == NULL)
 130                                 groupName = strchr(*argv, ':');
 131                         if (groupName) {
 132                                 *groupName++ = '\0';
 133                                 gid = strtoul(groupName, &p, 10);
 134                                 if (groupName == p)
 135                                         gid = my_getgrnam(groupName);
 136                                 if (gid == -1)
 137                                         goto bad_group;
 138                         } else
 139                                 gid = -1;
 140                 }
 141
 142
 143                 /* Find the selected user (if appropriate)  */
 144                 if (whichApp == CHOWN_APP) {
 145                         uid = strtoul(*argv, &p, 10);   /* if numeric ... */
 146                         if (*argv == p)
 147                                 uid = my_getpwnam(*argv);
 148                         if (uid == -1) {
 149                                 fatalError( "unknown user name: %s\n", *argv);
 150                         }
 151                 }
 152         }
 153
 154         /* Ok, ready to do the deed now */
 155         if (argc <= 1) {
 156                 fatalError(too_few_args);
 157         }
 158         while (argc-- > 1) {
 159                 if (recursiveAction (*(++argv), recursiveFlag, FALSE, FALSE,
 160                                         fileAction, fileAction, NULL) == FALSE)
 161                         exit(FALSE);
 162         }
 163         exit(TRUE);
 164
 165   bad_group:
 166         fatalError( "unknown group name: %s\n", groupName);
 167 }
 168
 169 /*
 170 Local Variables:
 171 c-file-style: "linux"
 172 c-basic-offset: 4
 173 tab-width: 4
 174 End:
 175 */