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/* $Owl: Owl/packages/util-linux/nologin.c,v 1.1 2005/12/24 16:03:38 ldv Exp $ */
/* $OpenBSD: nologin.c,v 1.5 2003/07/10 00:00:58 david Exp $ */
/*
* Copyright (c) 1997, Jason Downs. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1
#endif
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#undef errno
#include <linux/unistd.h>
/* Distinctly different from _PATH_NOLOGIN. */
#define _PATH_NOLOGIN_TXT "/etc/nologin.txt"
#define DEFAULT_MESG "This account is currently not available.\r\n"
int errno;
_syscall1(void,exit,int,status);
_syscall1(int,close,int,fd);
_syscall2(int,open,const char *,pathname,int,flags);
_syscall3(ssize_t,read,int,fd,void*,buf,size_t,count);
_syscall3(ssize_t,write,int,fd,const void*,buf,size_t,count);
static ssize_t
write_loop(int fd, const char *buffer, size_t count)
{
ssize_t offset = 0;
while (count > 0)
{
ssize_t block =
TEMP_FAILURE_RETRY(write(fd, &buffer[offset], count));
if (block <= 0)
return offset ? : block;
offset += block;
count -= block;
}
return offset;
}
int
_start(void)
{
int nfd;
ssize_t nrd;
char nbuf[BUFSIZ];
if ((nfd = open(_PATH_NOLOGIN_TXT, 0)) < 0)
{
write_loop(STDOUT_FILENO, DEFAULT_MESG,
sizeof(DEFAULT_MESG) - 1);
exit(EXIT_FAILURE);
}
while ((nrd = TEMP_FAILURE_RETRY(read(nfd, nbuf, sizeof(nbuf)))) > 0)
if (write_loop(STDOUT_FILENO, nbuf, (size_t) nrd) != nrd)
break;
close(nfd);
exit(EXIT_FAILURE);
}