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 #include "messages.c"
  29
  30 #include <stdio.h>
  31 #include <grp.h>
  32 #include <pwd.h>
  33
  34
  35 static unsigned long uid = -1;
  36 static unsigned long gid = -1;
  37 static int whichApp;
  38 static char *invocationName = NULL;
  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 const char chgrp_usage[] = "chgrp [OPTION]... GROUP FILE...\n"
  47 #ifndef BB_FEATURE_TRIVIAL_HELP
  48         "\nChange the group membership of each FILE to GROUP.\n"
  49         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  50 #endif
  51         ;
  52 static const char chown_usage[] =
  53         "chown [OPTION]...  OWNER[<.|:>[GROUP] FILE...\n"
  54 #ifndef BB_FEATURE_TRIVIAL_HELP
  55         "\nChange the owner and/or group of each FILE to OWNER and/or GROUP.\n"
  56         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  57 #endif
  58         ;
  59 static const char chmod_usage[] =
  60         "chmod [-R] MODE[,MODE]... FILE...\n"
  61 #ifndef BB_FEATURE_TRIVIAL_HELP
  62         "\nEach MODE is one or more of the letters ugoa, one of the symbols +-= and\n"
  63         "one or more of the letters rwxst.\n\n"
  64         "\nOptions:\n\t-R\tChanges files and directories recursively.\n"
  65 #endif
  66         ;
  67
  68
  69 static int fileAction(const char *fileName, struct stat *statbuf, void* junk)
  70 {
  71         switch (whichApp) {
  72         case CHGRP_APP:
  73         case CHOWN_APP:
  74 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
  75                 if (lchown
  76                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  77                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  78 #else
  79                 if (chown
  80                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  81                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  82 #endif
  83                 {
  84                         return (TRUE);
  85                 }
  86                 break;
  87         case CHMOD_APP:
  88                 /* Parse the specified modes */
  89                 if (parse_mode(theMode, &(statbuf->st_mode)) == FALSE) {
  90                         fatalError( "%s: unknown mode: %s\n", invocationName, theMode);
  91                 }
  92                 if (chmod(fileName, statbuf->st_mode) == 0)
  93                         return (TRUE);
  94                 break;
  95         }
  96         perror(fileName);
  97         return (FALSE);
  98 }
  99
 100 int chmod_chown_chgrp_main(int argc, char **argv)
 101 {
 102         int recursiveFlag = FALSE;
 103         char *groupName;
 104         char *p;
 105         const char *appUsage;
 106
 107         whichApp = (strcmp(*argv, "chown") == 0)?
 108                         CHOWN_APP : (strcmp(*argv, "chmod") == 0)?
 109                                 CHMOD_APP : CHGRP_APP;
 110
 111         appUsage = (whichApp == CHOWN_APP)?
 112                         chown_usage : (whichApp == CHMOD_APP) ? chmod_usage : chgrp_usage;
 113
 114         if (argc < 2)
 115                 usage(appUsage);
 116         invocationName = *argv;
 117         argc--;
 118         argv++;
 119
 120         /* Parse options */
 121         while (**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                 argc--;
 132                 argv++;
 133         }
 134
 135         if (whichApp == CHMOD_APP) {
 136                 theMode = *argv;
 137         } else {
 138
 139                 /* Find the selected group */
 140                 if (whichApp == CHGRP_APP) {
 141                         groupName = *argv;
 142                         gid = strtoul(groupName, &p, 10);       /* maybe it's already numeric */
 143                         if (groupName == p)
 144                                 gid = my_getgrnam(groupName);
 145                         if (gid == -1)
 146                                 goto bad_group;
 147                 } else {
 148                         groupName = strchr(*argv, '.');
 149                         if (groupName == NULL)
 150                                 groupName = strchr(*argv, ':');
 151                         if (groupName) {
 152                                 *groupName++ = '\0';
 153                                 gid = strtoul(groupName, &p, 10);
 154                                 if (groupName == p)
 155                                         gid = my_getgrnam(groupName);
 156                                 if (gid == -1)
 157                                         goto bad_group;
 158                         } else
 159                                 gid = -1;
 160                 }
 161
 162
 163                 /* Find the selected user (if appropriate)  */
 164                 if (whichApp == CHOWN_APP) {
 165                         uid = strtoul(*argv, &p, 10);   /* if numeric ... */
 166                         if (*argv == p)
 167                                 uid = my_getpwnam(*argv);
 168                         if (uid == -1) {
 169                                 fatalError( "%s: unknown user name: %s\n",
 170                                                 invocationName, *argv);
 171                         }
 172                 }
 173         }
 174
 175         /* Ok, ready to do the deed now */
 176         if (argc <= 1) {
 177                 fatalError( "%s: too few arguments\n", invocationName);
 178         }
 179         while (argc-- > 1) {
 180                 if (recursiveAction (*(++argv), recursiveFlag, FALSE, FALSE,
 181                                         fileAction, fileAction, NULL) == FALSE)
 182                         exit(FALSE);
 183         }
 184         exit(TRUE);
 185
 186   bad_group:
 187         fatalError( "%s: unknown group name: %s\n", invocationName, groupName);
 188 }
 189
 190 /*
 191 Local Variables:
 192 c-file-style: "linux"
 193 c-basic-offset: 4
 194 tab-width: 4
 195 End:
 196 */