usr.sbin/lpr/common_source/startdaemon.c

   1 /*      $NetBSD: startdaemon.c,v 1.14 2005/11/28 03:26:06 christos Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)startdaemon.c       8.2 (Berkeley) 4/17/94";
  36 #else
  37 __RCSID("$NetBSD: startdaemon.c,v 1.14 2005/11/28 03:26:06 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41
  42 #include <sys/param.h>
  43 #include <sys/socket.h>
  44 #include <sys/un.h>
  45
  46 #include <dirent.h>
  47 #include <errno.h>
  48 #include <stdio.h>
  49 #include <unistd.h>
  50 #include <string.h>
  51 #include <err.h>
  52 #include "lp.h"
  53 #include "pathnames.h"
  54
  55 extern uid_t    uid, euid;
  56
  57 /*
  58  * Tell the printer daemon that there are new files in the spool directory.
  59  */
  60
  61 int
  62 startdaemon(const char *pname)
  63 {
  64         struct sockaddr_un un;
  65         int s;
  66         int n;
  67         char buf[BUFSIZ];
  68
  69         s = socket(AF_LOCAL, SOCK_STREAM, 0);
  70         if (s < 0) {
  71                 warn("socket");
  72                 return(0);
  73         }
  74         memset(&un, 0, sizeof(un));
  75         un.sun_family = AF_LOCAL;
  76         strncpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path) - 1);
  77 #ifndef SUN_LEN
  78 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2)
  79 #endif
  80         seteuid(euid);
  81         if (connect(s, (const struct sockaddr *)&un,
  82             (int)SUN_LEN(&un)) < 0) {
  83                 seteuid(uid);
  84                 warn("connect");
  85                 (void)close(s);
  86                 return(0);
  87         }
  88         seteuid(uid);
  89         n = snprintf(buf, sizeof(buf), "\1%s\n", pname);
  90         if (write(s, buf, n) != n) {
  91                 warn("write");
  92                 (void)close(s);
  93                 return(0);
  94         }
  95         if (read(s, buf, 1) == 1) {
  96                 if (buf[0] == '\0') {           /* everything is OK */
  97                         (void)close(s);
  98                         return(1);
  99                 }
 100                 putchar(buf[0]);
 101         }
 102         while ((n = read(s, buf, sizeof(buf))) > 0)
 103                 fwrite(buf, 1, n, stdout);
 104         (void)close(s);
 105         return(0);
 106 }