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startdaemon.c revision 1.5 
      1 /*
      2  * Copyright (c) 1983, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)startdaemon.c	8.2 (Berkeley) 4/17/94";
     36 #endif /* not lint */
     37 
     38 
     39 #include <sys/param.h>
     40 #include <sys/socket.h>
     41 #include <sys/un.h>
     42 
     43 #include <dirent.h>
     44 #include <errno.h>
     45 #include <stdio.h>
     46 #include <unistd.h>
     47 #include <string.h>
     48 #include "lp.h"
     49 #include "pathnames.h"
     50 
     51 extern uid_t	uid, euid;
     52 
     53 static void perr __P((char *));
     54 
     55 /*
     56  * Tell the printer daemon that there are new files in the spool directory.
     57  */
     58 
     59 int
     60 startdaemon(printer)
     61 	char *printer;
     62 {
     63 	struct sockaddr_un un;
     64 	register int s, n;
     65 	char buf[BUFSIZ];
     66 
     67 	s = socket(AF_UNIX, SOCK_STREAM, 0);
     68 	if (s < 0) {
     69 		perr("socket");
     70 		return(0);
     71 	}
     72 	memset(&un, 0, sizeof(un));
     73 	un.sun_family = AF_UNIX;
     74 	strcpy(un.sun_path, _PATH_SOCKETNAME);
     75 #ifndef SUN_LEN
     76 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
     77 #endif
     78 	seteuid(euid);
     79 	if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) {
     80 		seteuid(uid);
     81 		perr("connect");
     82 		(void) close(s);
     83 		return(0);
     84 	}
     85 	seteuid(uid);
     86 	(void) sprintf(buf, "\1%s\n", printer);
     87 	n = strlen(buf);
     88 	if (write(s, buf, n) != n) {
     89 		perr("write");
     90 		(void) close(s);
     91 		return(0);
     92 	}
     93 	if (read(s, buf, 1) == 1) {
     94 		if (buf[0] == '\0') {		/* everything is OK */
     95 			(void) close(s);
     96 			return(1);
     97 		}
     98 		putchar(buf[0]);
     99 	}
    100 	while ((n = read(s, buf, sizeof(buf))) > 0)
    101 		fwrite(buf, 1, n, stdout);
    102 	(void) close(s);
    103 	return(0);
    104 }
    105 
    106 static void
    107 perr(msg)
    108 	char *msg;
    109 {
    110 	extern char *name;
    111 
    112 	(void)printf("%s: %s: %s\n", name, msg, strerror(errno));
    113 }
    114