setfacl.c

cygwin, 著名的在win32下模拟unix操作系统的东东

            "\n"
            "Modify file and directory access control lists (ACLs)\n"
            "\n"
            "  -d, --delete     delete one or more specified ACL entries\n"
            "  -f, --file       set ACL entries for FILE to ACL entries read\n"
            "                   from a ACL_FILE\n"
            "  -m, --modify     modify one or more specified ACL entries\n"
            "  -r, --replace    replace mask entry with maximum permissions\n"
            "                   needed for the file group class\n"
            "  -s, --substitute substitute specified ACL entries for the\n"
            "                   ACL of FILE\n"
            "  -h, --help       output usage information and exit\n"
            "  -v, --version    output version information and exit\n"
            "\n"
            "At least one of (-d, -f, -m, -s) must be specified\n"
            "\n"
            "", prog_name, prog_name);
  if (stream == stdout) 
  {
    printf(""
            "     Acl_entries are one or more comma-separated ACL entries \n"
            "     from the following list:\n"
            "\n"
            "         u[ser]::perm\n"
            "         u[ser]:uid:perm\n"
            "         g[roup]::perm\n"
            "         g[roup]:gid:perm\n"
            "         m[ask]::perm\n"
            "         o[ther]::perm\n"
            "\n"
            "     Default entries are like the above with the additional\n"
            "     default identifier. For example: \n"
            "\n"
            "         d[efault]:u[ser]:uid:perm\n"
            "\n"
            "     `perm' is either a 3-char permissions string in the form\n"
            "     \"rwx\" with the character - for no permission\n"
            "     or it is the octal representation of the permissions, a\n"
            "     value from 0 (equivalent to \"---\") to 7 (\"rwx\").\n"
            "     `uid' is a user name or a numerical uid.\n"
            "     `gid' is a group name or a numerical gid.\n"
            "\n"
            "\n"
            "For each file given as parameter, %s will either replace its\n"
            "complete ACL (-s, -f), or it will add, modify, or delete ACL\n"
            "entries.\n"
            "\n"
            "The following options are supported:\n"
            "\n"
            "-d   Delete one or more specified entries from the file's ACL.\n"
            "     The owner, group and others entries must not be deleted.\n"
            "     Acl_entries to be deleted should be specified without\n"
            "     permissions, as in the following list:\n"
            "\n"
            "         u[ser]:uid\n"
            "         g[roup]:gid\n"
            "         d[efault]:u[ser]:uid\n"
            "         d[efault]:g[roup]:gid\n"
            "         d[efault]:m[ask]:\n"
            "         d[efault]:o[ther]:\n"
            "\n"
            "-f   Take the Acl_entries from ACL_FILE one per line. Whitespace\n"
            "     characters are ignored, and the character \"#\" may be used\n"
            "     to start a comment.  The special filename \"-\" indicates\n"
            "     reading from stdin.\n"
            "     Required entries are\n"
            "     - One user entry for the owner of the file.\n"
            "     - One group entry for the group of the file.\n"
            "     - One other entry.\n"
            "     If additional user and group entries are given:\n"
            "     - A mask entry for the file group class of the file.\n"
            "     - No duplicate user or group entries with the same uid/gid.\n"
            "     If it is a directory:\n"
            "     - One default user entry for the owner of the file.\n"
            "     - One default group entry for the group of the file.\n"
            "     - One default mask entry for the file group class.\n"
            "     - One default other entry.\n"
            "\n"
            "-m   Add or modify one or more specified ACL entries.\n"
            "     Acl_entries is a comma-separated list of entries from the \n"
            "     same list as above.\n"
            "\n"
            "-r   Causes the permissions specified in the mask entry to be\n"
            "     ignored and replaced by the maximum permissions needed for\n"
            "     the file group class.\n"
            "\n"
            "-s   Like -f, but substitute the file's ACL with Acl_entries\n" 
            "     specified in a comma-separated list on the command line.\n"
            "\n"
            "While the -d and -m options may be used in the same command, the\n"
            "-f and -s options may be used only exclusively.\n"
            "\n"
            "Directories may contain default ACL entries.  Files created\n"
            "in a directory that contains default ACL entries will have\n"
            "permissions according to the combination of the current umask,\n"
            "the explicit permissions requested and the default ACL entries\n"
            "Note: Under Cygwin, the default ACL entries are not taken into\n"
            "account currently.\n", prog_name);
  }
  else
    fprintf(stream, "Try `%s --help' for more information.\n", prog_name);
}

struct option longopts[] = {
  {"delete", required_argument, NULL, 'd'},
  {"file", required_argument, NULL, 'f'},
  {"modify", required_argument, NULL, 'm'},
  {"replace", no_argument, NULL, 'r'},
  {"substitute", required_argument, NULL, 's'},
  {"help", no_argument, NULL, 'h'},
  {"version", no_argument, NULL, 'v'},
  {0, no_argument, NULL, 0}
};

static void
print_version ()
{
  const char *v = strchr (version, ':');
  int len;
  if (!v)
    {
      v = "?";
      len = 1;
    }
  else
    {
      v += 2;
      len = strchr (v, ' ') - v;
    }
  printf ("\
setfacl (cygwin) %.*s\n\
ACL Modification Utility\n\
Copyright 2000, 2001, 2002 Red Hat, Inc.\n\
Compiled on %s\n\
", len, v, __DATE__);
}

int
main (int argc, char **argv)
{
  extern char *optarg;
  extern int optind;
  int c;
  action_t action = NoAction;
  int ropt = 0;
  aclent_t acls[MAX_ACL_ENTRIES];
  int aclidx = 0;

  prog_name = strrchr (argv[0], '/');
  if (prog_name == NULL)
    prog_name = strrchr (argv[0], '\\');
  if (prog_name == NULL)
    prog_name = argv[0];
  else
    prog_name++;

  memset (acls, 0, sizeof acls);
  while ((c = getopt_long (argc, argv, "d:f:hm:rs:v", longopts, NULL)) != EOF)
    switch (c)
      {
      case 'd':
        if (action == NoAction)
          action = Delete;
        else if (action == Modify)
          action = ModNDel;
        else
          {
            usage (stderr);
            return 1;
	  }
        if (! getaclentries (Delete, optarg, acls, &aclidx))
          {
            fprintf (stderr, "%s: illegal acl entries\n", prog_name);
            return 2;
          }
        break;
      case 'f':
        if (action == NoAction)
          action = Set;
        else
          {
            usage (stderr);
            return 1;
	  }
        if (! getaclentries (SetFromFile, optarg, acls, &aclidx))
          {
            fprintf (stderr, "%s: illegal acl entries\n", prog_name);
            return 2;
          }
        break;
      case 'h':
        usage (stdout);
        return 0;
      case 'm':
        if (action == NoAction)
          action = Modify;
        else if (action == Delete)
          action = ModNDel;
        else
          {
            usage (stderr);
            return 1;
	  }
        if (! getaclentries (Modify, optarg, acls, &aclidx))
          {
            fprintf (stderr, "%s: illegal acl entries\n", prog_name);
            return 2;
          }
        break;
      case 'r':
        if (!ropt)
          ropt = 1;
        else
          {
            usage (stderr);
            return 1;
	  }
        break;
      case 's':
        if (action == NoAction)
          action = Set;
        else
          {
            usage (stderr);
            return 1;
	  }
        break;
        if (! getaclentries (Set, optarg, acls, &aclidx))
          {
            fprintf (stderr, "%s: illegal acl entries\n", prog_name);
            return 2;
          }
        break;
      case 'v':
        print_version ();
        return 0;
      default:
        usage (stderr);
        return 1;
      }
  if (action == NoAction)
    {
      usage (stderr);
      return 1;
    }
  if (optind > argc - 1)
    {
      usage (stderr);
      return 1;
    }
  if (action == Set)
    switch (aclcheck (acls, aclidx, NULL))
      {
      case GRP_ERROR:
        fprintf (stderr, "%s: more than one group entry.\n", prog_name);
        return 2;
      case USER_ERROR:
        fprintf (stderr, "%s: more than one user entry.\n", prog_name);
        return 2;
      case CLASS_ERROR:
        fprintf (stderr, "%s: more than one mask entry.\n", prog_name);
        return 2;
      case OTHER_ERROR:
        fprintf (stderr, "%s: more than one other entry.\n", prog_name);
        return 2;
      case DUPLICATE_ERROR:
        fprintf (stderr, "%s: duplicate additional user or group.\n", prog_name);
        return 2;
      case ENTRY_ERROR:
        fprintf (stderr, "%s: invalid entry type.\n", prog_name);
        return 2;
      case MISS_ERROR:
        fprintf (stderr, "%s: missing entries.\n", prog_name);
        return 2;
      case MEM_ERROR:
        fprintf (stderr, "%s: out of memory.\n", prog_name);
        return 2;
      default:
        break;
      }
  for (c = optind; c < argc; ++c)
    setfacl (action, argv[c], acls, aclidx);
  return 0;
}