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 unsigned long uid = -1;
  37 static unsigned long gid = -1;
  38 static int whichApp;
  39 static char *invocationName = NULL;
  40 static char *theMode = NULL;
  41
  42
  43 #define CHGRP_APP   1
  44 #define CHOWN_APP   2
  45 #define CHMOD_APP   3
  46
  47 static const char chgrp_usage[] = "chgrp [OPTION]... GROUP FILE...\n"
  48 #ifndef BB_FEATURE_TRIVIAL_HELP
  49         "\nChange the group membership of each FILE to GROUP.\n"
  50         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  51 #endif
  52         ;
  53 static const char chown_usage[] =
  54         "chown [OPTION]...  OWNER[<.|:>[GROUP] FILE...\n"
  55 #ifndef BB_FEATURE_TRIVIAL_HELP
  56         "\nChange the owner and/or group of each FILE to OWNER and/or GROUP.\n"
  57         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  58 #endif
  59         ;
  60 static const char chmod_usage[] =
  61         "chmod [-R] MODE[,MODE]... FILE...\n"
  62 #ifndef BB_FEATURE_TRIVIAL_HELP
  63         "\nEach MODE is one or more of the letters ugoa, one of the symbols +-= and\n"
  64         "one or more of the letters rwxst.\n\n"
  65         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  66 #endif
  67         ;
  68
  69
  70 static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
  71 {
  72         switch (whichApp) {
  73         case CHGRP_APP:
  74         case CHOWN_APP:
  75 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
  76                 if (lchown
  77                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  78                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  79 #else
  80                 if (chown
  81                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  82                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  83 #endif
  84                 {
  85                         return (TRUE);
  86                 }
  87                 break;
  88         case CHMOD_APP:
  89                 /* Parse the specified modes */
  90                 if (parse_mode(theMode, &(statbuf->st_mode)) == FALSE) {
  91                         fatalError( "%s: unknown mode: %s\n", invocationName, theMode);
  92                 }
  93                 if (chmod(fileName, statbuf->st_mode) == 0)
  94                         return (TRUE);
  95                 break;
  96         }
  97         perror(fileName);
  98         return (FALSE);
  99 }
 100
 101 int chmod_chown_chgrp_main(int argc, char **argv)
 102 {
 103         int recursiveFlag = FALSE;
 104         char *groupName=NULL;
 105         char *p=NULL;
 106         const char *appUsage;
 107
 108         whichApp = (strcmp(*argv, "chown") == 0)?
 109                         CHOWN_APP : (strcmp(*argv, "chmod") == 0)?
 110                                 CHMOD_APP : CHGRP_APP;
 111
 112         appUsage = (whichApp == CHOWN_APP)?
 113                         chown_usage : (whichApp == CHMOD_APP) ? chmod_usage : chgrp_usage;
 114
 115         if (argc < 2)
 116                 usage(appUsage);
 117         invocationName = *argv;
 118         argv++;
 119
 120         /* Parse options */
 121         while (--argc >= 0 && *argv && (**argv == '-')) {
 122                 while (*++(*argv)) {
 123                         switch (**argv) {
 124                                 case 'R':
 125                                         recursiveFlag = TRUE;
 126                                         break;
 127                                 default:
 128                                         fprintf(stderr, invalid_option, invocationName, **argv);
 129                                         usage(appUsage);
 130                         }
 131                 }
 132                 argv++;
 133         }
 134
 135         if (argc == 0 || *argv == NULL) {
 136                 fprintf(stderr, too_few_args, invocationName);
 137                 usage(appUsage);
 138         }
 139
 140         if (whichApp == CHMOD_APP) {
 141                 theMode = *argv;
 142         } else {
 143
 144                 /* Find the selected group */
 145                 if (whichApp == CHGRP_APP) {
 146                         groupName = *argv;
 147                         gid = strtoul(groupName, &p, 10);       /* maybe it's already numeric */
 148                         if (groupName == p)
 149                                 gid = my_getgrnam(groupName);
 150                         if (gid == -1)
 151                                 goto bad_group;
 152                 } else {
 153                         groupName = strchr(*argv, '.');
 154                         if (groupName == NULL)
 155                                 groupName = strchr(*argv, ':');
 156                         if (groupName) {
 157                                 *groupName++ = '\0';
 158                                 gid = strtoul(groupName, &p, 10);
 159                                 if (groupName == p)
 160                                         gid = my_getgrnam(groupName);
 161                                 if (gid == -1)
 162                                         goto bad_group;
 163                         } else
 164                                 gid = -1;
 165                 }
 166
 167
 168                 /* Find the selected user (if appropriate)  */
 169                 if (whichApp == CHOWN_APP) {
 170                         uid = strtoul(*argv, &p, 10);   /* if numeric ... */
 171                         if (*argv == p)
 172                                 uid = my_getpwnam(*argv);
 173                         if (uid == -1) {
 174                                 fatalError( "%s: unknown user name: %s\n",
 175                                                 invocationName, *argv);
 176                         }
 177                 }
 178         }
 179
 180         /* Ok, ready to do the deed now */
 181         if (argc <= 1) {
 182                 fatalError( "%s: too few arguments\n", invocationName);
 183         }
 184         while (argc-- > 1) {
 185                 if (recursiveAction (*(++argv), recursiveFlag, FALSE, FALSE,
 186                                         fileAction, fileAction, NULL) == FALSE)
 187                         exit(FALSE);
 188         }
 189         exit(TRUE);
 190
 191   bad_group:
 192         fatalError( "%s: unknown group name: %s\n", invocationName, groupName);
 193 }
 194
 195 /*
 196 Local Variables:
 197 c-file-style: "linux"
 198 c-basic-offset: 4
 199 tab-width: 4
 200 End:
 201 */