winsup/utils/getfacl.c

   1 /* getfacl.c
   2
   3    Copyright 2000, 2001 Red Hat Inc.
   4
   5    Written by Corinna Vinschen <vinschen@redhat.com>
   6
   7 This file is part of Cygwin.
   8
   9 This software is a copyrighted work licensed under the terms of the
  10 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
  11 details. */
  12
  13 #include <pwd.h>
  14 #include <grp.h>
  15 #include <stdio.h>
  16 #include <unistd.h>
  17 #include <getopt.h>
  18 #include <sys/types.h>
  19 #include <sys/acl.h>
  20 #include <sys/stat.h>
  21
  22 char *
  23 permstr (mode_t perm)
  24 {
  25   static char pbuf[4];
  26
  27   pbuf[0] = (perm & S_IREAD) ? 'r' : '-';
  28   pbuf[1] = (perm & S_IWRITE) ? 'w' : '-';
  29   pbuf[2] = (perm & S_IEXEC) ? 'x' : '-';
  30   pbuf[3] = '\0';
  31   return pbuf;
  32 }
  33
  34 const char *
  35 username (uid_t uid)
  36 {
  37   static char ubuf[256];
  38   struct passwd *pw;
  39
  40   if ((pw = getpwuid (uid)))
  41     strcpy (ubuf, pw->pw_name);
  42   else
  43     sprintf (ubuf, "%d <unknown>", uid);
  44   return ubuf;
  45 }
  46
  47 const char *
  48 groupname (gid_t gid)
  49 {
  50   static char gbuf[256];
  51   struct group *gr;
  52
  53   if ((gr = getgrgid (gid)))
  54     strcpy (gbuf, gr->gr_name);
  55   else
  56     sprintf (gbuf, "%d <unknown>", gid);
  57   return gbuf;
  58 }
  59
  60 #define pn(txt) fprintf (fp, txt "\n", name)
  61 #define p(txt)  fprintf (fp, txt "\n")
  62
  63 int
  64 usage (const char *name, int help)
  65 {
  66   FILE *fp = help ? stdout : stderr;
  67
  68   pn ("usage: %s [-adn] file...");
  69   if (!help)
  70     pn ("Try `%s --help' for more information.");
  71   else
  72     {
  73       p ("");
  74       p ("Display file and directory access control lists (ACLs).");
  75       p ("");
  76       p ("For each argument that is a regular file, special file or");
  77       p ("directory, getfacl displays the owner, the group, and the ACL.");
  78       p ("For directories getfacl displays additionally the default ACL.");
  79       p ("");
  80       p ("With no options specified, getfacl displays the filename, the");
  81       p ("owner, the group, and both the ACL and the default ACL, if it");
  82       p ("exists.");
  83       p ("");
  84       p ("The following options are supported:");
  85       p ("");
  86       p ("-a   Display the filename, the owner, the group, and the ACL");
  87       p ("     of the file.");
  88       p ("");
  89       p ("-d   Display the filename, the owner, the group, and the default");
  90       p ("     ACL of the directory, if it exists.");
  91       p ("");
  92       p ("-n   Display user and group IDs instead of names.");
  93       p ("");
  94       p ("The format for ACL output is as follows:");
  95       p ("     # file: filename");
  96       p ("     # owner: name or uid");
  97       p ("     # group: name or uid");
  98       p ("     user::perm");
  99       p ("     user:name or uid:perm");
 100       p ("     group::perm");
 101       p ("     group:name or gid:perm");
 102       p ("     mask:perm");
 103       p ("     other:perm");
 104       p ("     default:user::perm");
 105       p ("     default:user:name or uid:perm");
 106       p ("     default:group::perm");
 107       p ("     default:group:name or gid:perm");
 108       p ("     default:mask:perm");
 109       p ("     default:other:perm");
 110       p ("");
 111       p ("When multiple files are specified on the command line, a blank");
 112       p ("line separates the ACLs for each file.");
 113     }
 114   return 1;
 115 }
 116
 117 struct option longopts[] = {
 118   {"help", no_argument, NULL, 'h'},
 119   {0, no_argument, NULL, 0}
 120 };
 121
 122 int
 123 main (int argc, char **argv)
 124 {
 125   extern int optind;
 126   int c, i;
 127   int aopt = 0;
 128   int dopt = 0;
 129   int nopt = 0;
 130   int first = 1;
 131   struct stat st;
 132   aclent_t acls[MAX_ACL_ENTRIES];
 133
 134   while ((c = getopt_long (argc, argv, "adn", longopts, NULL)) != EOF)
 135     switch (c)
 136       {
 137       case 'a':
 138         aopt = 1;
 139         break;
 140       case 'd':
 141         dopt = 1;
 142         break;
 143       case 'n':
 144         nopt = 1;
 145         break;
 146       case 'h':
 147         return usage (argv[0], 1);
 148       default:
 149         return usage (argv[0], 0);
 150       }
 151   if (optind > argc - 1)
 152     return usage (argv[0], 0);
 153   while ((c = optind++) < argc)
 154     {
 155       if (stat (argv[c], &st))
 156         {
 157           perror (argv[0]);
 158           continue;
 159         }
 160       if (!first)
 161         putchar ('\n');
 162       first = 0;
 163       printf ("# file: %s\n", argv[c]);
 164       if (nopt)
 165         {
 166           printf ("# owner: %d\n", st.st_uid);
 167           printf ("# group: %d\n", st.st_gid);
 168         }
 169       else
 170         {
 171           printf ("# owner: %s\n", username (st.st_uid));
 172           printf ("# group: %s\n", groupname (st.st_gid));
 173         }
 174       if ((c = acl (argv[c], GETACL, MAX_ACL_ENTRIES, acls)) < 0)
 175         {
 176           perror (argv[0]);
 177           continue;
 178         }
 179       for (i = 0; i < c; ++i)
 180         {
 181           if (acls[i].a_type & ACL_DEFAULT)
 182             {
 183               if (aopt)
 184                 continue;
 185               printf ("default:");
 186             }
 187           else if (dopt)
 188             continue;
 189           switch (acls[i].a_type & ~ACL_DEFAULT)
 190             {
 191             case USER_OBJ:
 192               printf ("user::");
 193               break;
 194             case USER:
 195               if (nopt)
 196                 printf ("user:%d:", acls[i].a_id);
 197               else
 198                 printf ("user:%s:", username (acls[i].a_id));
 199               break;
 200             case GROUP_OBJ:
 201               printf ("group::");
 202               break;
 203             case GROUP:
 204               if (nopt)
 205                 printf ("group:%d:", acls[i].a_id);
 206               else
 207                 printf ("group:%s:", groupname (acls[i].a_id));
 208               break;
 209             case CLASS_OBJ:
 210               printf ("mask::");
 211               break;
 212             case OTHER_OBJ:
 213               printf ("other::");
 214               break;
 215             }
 216           printf ("%s\n", permstr (acls[i].a_perm));
 217         }
 218     }
 219   return 0;
 220 }