freebsd-dev/usr.sbin/lpr/common_source/startdaemon.c
Garance A Drosehn 055c131503 Improve the error message the user sees if the startdaemon routine cannot
connect() to the socket for lpd.  Tell them this error probably means that
the master 'lpd' process is not running.

MFC after:	4 days
2002-04-23 02:42:04 +00:00

112 lines
3.3 KiB
C

/*
* Copyright (c) 1983, 1993, 1994
* The Regents of the University of California. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 lint
#if 0
static char sccsid[] = "@(#)startdaemon.c 8.2 (Berkeley) 4/17/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <dirent.h>
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "lp.h"
#include "pathnames.h"
extern uid_t uid, euid;
/*
* Tell the printer daemon that there are new files in the spool directory.
*/
int
startdaemon(const struct printer *pp)
{
struct sockaddr_un un;
register int s, n;
int connectres;
char c;
s = socket(PF_LOCAL, SOCK_STREAM, 0);
if (s < 0) {
warn("socket");
return(0);
}
memset(&un, 0, sizeof(un));
un.sun_family = AF_LOCAL;
strcpy(un.sun_path, _PATH_SOCKETNAME);
#ifndef SUN_LEN
#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
#endif
seteuid(euid);
connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un));
seteuid(uid);
if (connectres < 0) {
warn("Unable to connect to %s", _PATH_SOCKETNAME);
warnx("Check to see if the master 'lpd' process is running.");
(void) close(s);
return(0);
}
/*
* Avoid overruns without putting artificial limitations on
* the length.
*/
if (writel(s, "\1", pp->printer, "\n", (char *)0) <= 0) {
warn("write");
(void) close(s);
return(0);
}
if (read(s, &c, 1) == 1) {
if (c == '\0') { /* everything is OK */
(void) close(s);
return(1);
}
putchar(c);
}
while ((n = read(s, &c, 1)) > 0)
putchar(c);
(void) close(s);
return(0);
}