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startdaemon.c revision 1.6 
      1 /*	$NetBSD: startdaemon.c,v 1.6 1995/11/15 22:23:20 pk Exp $	*/
      2 /*
      3  * Copyright (c) 1983, 1993, 1994
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by the University of
     17  *	California, Berkeley and its contributors.
     18  * 4. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #ifndef lint
     36 static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
     37 #endif /* not lint */
     38 
     39 
     40 #include <sys/param.h>
     41 #include <sys/socket.h>
     42 #include <sys/un.h>
     43 
     44 #include <dirent.h>
     45 #include <errno.h>
     46 #include <stdio.h>
     47 #include <unistd.h>
     48 #include <string.h>
     49 #include "lp.h"
     50 #include "pathnames.h"
     51 
     52 extern uid_t	uid, euid;
     53 
     54 static void perr __P((char *));
     55 
     56 /*
     57  * Tell the printer daemon that there are new files in the spool directory.
     58  */
     59 
     60 int
     61 startdaemon(printer)
     62 	char *printer;
     63 {
     64 	struct sockaddr_un un;
     65 	register int s, n;
     66 	char buf[BUFSIZ];
     67 
     68 	s = socket(AF_UNIX, SOCK_STREAM, 0);
     69 	if (s < 0) {
     70 		perr("socket");
     71 		return(0);
     72 	}
     73 	memset(&un, 0, sizeof(un));
     74 	un.sun_family = AF_UNIX;
     75 	strcpy(un.sun_path, _PATH_SOCKETNAME);
     76 #ifndef SUN_LEN
     77 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
     78 #endif
     79 	seteuid(euid);
     80 	if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
     81 		seteuid(uid);
     82 		perr("connect");
     83 		(void) close(s);
     84 		return(0);
     85 	}
     86 	seteuid(uid);
     87 	(void) sprintf(buf, "\1%s\n", printer);
     88 	n = strlen(buf);
     89 	if (write(s, buf, n) != n) {
     90 		perr("write");
     91 		(void) close(s);
     92 		return(0);
     93 	}
     94 	if (read(s, buf, 1) == 1) {
     95 		if (buf[0] == '\0') {		/* everything is OK */
     96 			(void) close(s);
     97 			return(1);
     98 		}
     99 		putchar(buf[0]);
    100 	}
    101 	while ((n = read(s, buf, sizeof(buf))) > 0)
    102 		fwrite(buf, 1, n, stdout);
    103 	(void) close(s);
    104 	return(0);
    105 }
    106 
    107 static void
    108 perr(msg)
    109 	char *msg;
    110 {
    111 	extern char *name;
    112 
    113 	(void)printf("%s: %s: %s\n", name, msg, strerror(errno));
    114 }
    115