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