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/*
* nologinmsg.c - A slightly improved nologin that will return a configurable
* message, depending on how it is called.
*
* Copyright (c) 2002
* Richard Rose. 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 ``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 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.
*
* $Id: nologinmsg.c,v 1.1 2002/07/10 16:39:35 rik Exp $
*
* rik
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sysexits.h>
#include <limits.h>
#include <err.h>
#include <fcntl.h>
#include <syslog.h>
#include "pathnames.h"
#define NOLOGINMSG_NAME "nologinmsg"
#define NOLOGINMSG_MSG "This account is currently not available.\n"
/*
* main - Program entry point.
* Check how we are called. If it is not the way we expect, then search
* the hard coded path for a file named with the name we are called with,
* or, if that fails, the name of the user we are being run as, and print
* that. After printing a message, quit.
*/
int main (void)
{
char messagePath[PATH_MAX];
char msgbuf[1024]; /* Arbitrary constant */
char *user, *device;
int fd, nbytes;
struct stat buf;
user = getlogin();
if (user == NULL)
user = "UNKNOWN";
device = ttyname(0);
if (device == NULL)
device = "UNKNOWN";
openlog( "nologinmsg", LOG_CONS, LOG_AUTH );
syslog( LOG_WARNING, "%.35s on %.35s", user, device);
closelog();
strlcpy( messagePath, NOLOGINMSG_PATH, sizeof( messagePath ) );
if (strcmp( getprogname(), NOLOGINMSG_NAME ) == 0){
/*
* Check for a user names message. If it exists and we can read it,
* then print that, otherwise print the standard message
*/
if (strlcat( messagePath, getlogin(), sizeof( messagePath ) ) >
sizeof( messagePath ) )
goto printStandard;
} else {
/*
* We have been invoked by a different name. Check for a specific
* message to print, and print it if we can, else print the standard
* message
*/
if (strlcat( messagePath, getprogname(), sizeof( messagePath ) ) >
sizeof( messagePath ) )
goto printStandard;
}
if (stat( messagePath, &buf ) != 0)
goto printStandard;
if ((buf.st_mode & S_IFREG) == 0)
goto printStandard;
fd = open( messagePath, O_RDONLY );
if (fd == -1)
goto printStandard;
for (;;){
nbytes = read( fd, msgbuf, sizeof( msgbuf ) );
if (nbytes == -1)
goto printStandard;
write( STDERR_FILENO, msgbuf, nbytes );
if (nbytes < sizeof( msgbuf ))
exit( EX_UNAVAILABLE );
}
printStandard:
write( STDERR_FILENO, NOLOGINMSG_MSG, sizeof( NOLOGINMSG_MSG ) - 1 );
exit( EX_UNAVAILABLE );
}
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