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 "busybox.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 stopIt = FALSE;
  80         int recursiveFlag = FALSE;
  81         char *groupName=NULL;
  82         char *p=NULL;
  83         const char *appUsage;
  84
  85         whichApp = (strcmp(applet_name, "chown") == 0)?
  86                         CHOWN_APP : (strcmp(applet_name, "chmod") == 0)?
  87                                 CHMOD_APP : CHGRP_APP;
  88
  89         appUsage = (whichApp == CHOWN_APP)?
  90                         chown_usage : (whichApp == CHMOD_APP) ? chmod_usage : chgrp_usage;
  91
  92         if (argc < 2)
  93                 usage(appUsage);
  94         argv++;
  95
  96         /* Parse options */
  97         while (--argc >= 0 && *argv && (**argv == '-')) {
  98                 while (stopIt==FALSE && *++(*argv)) {
  99                         switch (**argv) {
 100                                 case 'R':
 101                                         recursiveFlag = TRUE;
 102                                         break;
 103                                 default:
 104                                         theMode=*argv-1;
 105                                         stopIt = TRUE;
 106                         }
 107                 }
 108                 if (stopIt==TRUE)
 109                         break;
 110                 argv++;
 111         }
 112
 113         if (argc == 0 || *argv == NULL) {
 114                 errorMsg(too_few_args);
 115         }
 116
 117         if (whichApp == CHMOD_APP) {
 118                 if (theMode==NULL)
 119                         theMode = *argv;
 120         } else {
 121
 122                 /* Find the selected group */
 123                 if (whichApp == CHGRP_APP) {
 124                         groupName = *argv;
 125                         gid = strtoul(groupName, &p, 10);       /* maybe it's already numeric */
 126                         if (groupName == p)
 127                                 gid = my_getgrnam(groupName);
 128                         if (gid == -1)
 129                                 goto bad_group;
 130                 } else {
 131                         groupName = strchr(*argv, '.');
 132                         if (groupName == NULL)
 133                                 groupName = strchr(*argv, ':');
 134                         if (groupName) {
 135                                 *groupName++ = '\0';
 136                                 gid = strtoul(groupName, &p, 10);
 137                                 if (groupName == p)
 138                                         gid = my_getgrnam(groupName);
 139                                 if (gid == -1)
 140                                         goto bad_group;
 141                         } else
 142                                 gid = -1;
 143                 }
 144
 145
 146                 /* Find the selected user (if appropriate)  */
 147                 if (whichApp == CHOWN_APP) {
 148                         uid = strtoul(*argv, &p, 10);   /* if numeric ... */
 149                         if (*argv == p)
 150                                 uid = my_getpwnam(*argv);
 151                         if (uid == -1) {
 152                                 fatalError( "unknown user name: %s\n", *argv);
 153                         }
 154                 }
 155         }
 156
 157         /* Ok, ready to do the deed now */
 158         if (argc < 1) {
 159                 fatalError(too_few_args);
 160         }
 161         while (argc-- > 1) {
 162                 if (recursiveAction (*(++argv), recursiveFlag, FALSE, FALSE,
 163                                         fileAction, fileAction, NULL) == FALSE)
 164                         return EXIT_FAILURE;
 165         }
 166         return EXIT_SUCCESS;
 167
 168   bad_group:
 169         fatalError( "unknown group name: %s\n", groupName);
 170 }
 171
 172 /*
 173 Local Variables:
 174 c-file-style: "linux"
 175 c-basic-offset: 4
 176 tab-width: 4
 177 End:
 178 */