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) 1999,2000,2001 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 <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include "busybox.h"
  30 #define BB_DECLARE_EXTERN
  31 #define bb_need_invalid_option
  32 #define bb_need_too_few_args
  33 #include "messages.c"
  34
  35
  36
  37 static long uid = -1;
  38 static long gid = -1;
  39 static int whichApp;
  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 int fileAction(const char *fileName, struct stat *statbuf, void* junk)
  48 {
  49         switch (whichApp) {
  50         case CHGRP_APP:
  51         case CHOWN_APP:
  52 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
  53                 if (lchown
  54                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  55                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  56 #else
  57                 if (chown
  58                         (fileName, (whichApp == CHOWN_APP) ? uid : statbuf->st_uid,
  59                          (gid == -1) ? statbuf->st_gid : gid) == 0)
  60 #endif
  61                 {
  62                         return (TRUE);
  63                 }
  64                 break;
  65         case CHMOD_APP:
  66                 /* Parse the specified modes */
  67                 if (parse_mode(theMode, &(statbuf->st_mode)) == FALSE) {
  68                         error_msg_and_die( "unknown mode: %s", theMode);
  69                 }
  70                 if (chmod(fileName, statbuf->st_mode) == 0)
  71                         return (TRUE);
  72                 break;
  73         }
  74         perror(fileName);
  75         return (FALSE);
  76 }
  77
  78 int chmod_chown_chgrp_main(int argc, char **argv)
  79 {
  80         int stopIt = FALSE;
  81         int recursiveFlag = FALSE;
  82         char *groupName=NULL;
  83         char *p=NULL;
  84
  85         whichApp = (applet_name[2]=='o')?           /* chown */
  86                 CHOWN_APP : (applet_name[2]=='m')?      /* chmod */
  87                 CHMOD_APP : CHGRP_APP;
  88
  89         if (argc < 2)
  90                 show_usage();
  91         argv++;
  92
  93         /* Parse options */
  94         while (--argc >= 0 && *argv && (**argv == '-')) {
  95                 while (stopIt==FALSE && *++(*argv)) {
  96                         switch (**argv) {
  97                                 case 'R':
  98                                         recursiveFlag = TRUE;
  99                                         break;
 100                                 default:
 101                                         theMode=*argv-1;
 102                                         stopIt = TRUE;
 103                         }
 104                 }
 105                 if (stopIt==TRUE)
 106                         break;
 107                 argv++;
 108         }
 109
 110         if (argc == 0 || *argv == NULL) {
 111                 error_msg(too_few_args);
 112         }
 113
 114         if (whichApp == CHMOD_APP) {
 115                 if (theMode==NULL)
 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                                 error_msg_and_die( "unknown user name: %s", *argv);
 150                         }
 151                 }
 152         }
 153
 154         /* Ok, ready to do the deed now */
 155         if (argc < 1) {
 156                 error_msg_and_die(too_few_args);
 157         }
 158         while (argc-- > 1) {
 159                 if (recursive_action (*(++argv), recursiveFlag, FALSE, FALSE,
 160                                         fileAction, fileAction, NULL) == FALSE)
 161                         return EXIT_FAILURE;
 162         }
 163         return EXIT_SUCCESS;
 164
 165   bad_group:
 166         error_msg_and_die( "unknown group name: %s", groupName);
 167 }
 168
 169 /*
 170 Local Variables:
 171 c-file-style: "linux"
 172 c-basic-offset: 4
 173 tab-width: 4
 174 End:
 175 */