65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/* $OpenBSD: nologin.c,v 1.10 2023/03/08 04:43:06 guenther Exp $ */
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/*
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* Copyright (c) 1997, Jason Downs. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* Distinctly different from _PATH_NOLOGIN. */
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#define _PATH_NOLOGIN_TXT "/etc/nologin.txt"
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#define DEFAULT_MESG "This account is currently not available.\n"
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int
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main(int argc, char *argv[])
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{
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int nfd;
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ssize_t nrd;
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char nbuf[BUFSIZ];
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if (unveil(_PATH_NOLOGIN_TXT, "r") == -1)
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err(1, "unveil %s", _PATH_NOLOGIN_TXT);
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if (pledge("stdio rpath", NULL) == -1)
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err(1, "pledge");
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nfd = open(_PATH_NOLOGIN_TXT, O_RDONLY);
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if (nfd == -1) {
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write(STDOUT_FILENO, DEFAULT_MESG, strlen(DEFAULT_MESG));
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exit (1);
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}
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while ((nrd = read(nfd, nbuf, sizeof(nbuf))) != -1 && nrd != 0)
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write(STDOUT_FILENO, nbuf, nrd);
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close (nfd);
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exit (1);
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}
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