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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)startdaemon.c 8.2 (Berkeley) 4/17/94 30 * $FreeBSD: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.8.2.2 2002/04/26 18:24:40 gad Exp $ 31 * $DragonFly: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.4 2004/12/18 22:48:03 swildner Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/uio.h> 37 #include <sys/un.h> 38 39 #include <dirent.h> 40 #include <err.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <unistd.h> 44 #include "lp.h" 45 #include "pathnames.h" 46 47 extern uid_t uid, euid; 48 49 /* 50 * Tell the printer daemon that there are new files in the spool directory. 51 */ 52 53 int 54 startdaemon(const struct printer *pp) 55 { 56 struct sockaddr_un un; 57 int s, n; 58 int connectres; 59 char c; 60 61 s = socket(PF_LOCAL, SOCK_STREAM, 0); 62 if (s < 0) { 63 warn("socket"); 64 return(0); 65 } 66 memset(&un, 0, sizeof(un)); 67 un.sun_family = AF_LOCAL; 68 strcpy(un.sun_path, _PATH_SOCKETNAME); 69 #ifndef SUN_LEN 70 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 71 #endif 72 seteuid(euid); 73 connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un)); 74 seteuid(uid); 75 if (connectres < 0) { 76 warn("Unable to connect to %s", _PATH_SOCKETNAME); 77 warnx("Check to see if the master 'lpd' process is running."); 78 close(s); 79 return(0); 80 } 81 82 /* 83 * Avoid overruns without putting artificial limitations on 84 * the length. 85 */ 86 if (writel(s, "\1", pp->printer, "\n", NULL) <= 0) { 87 warn("write"); 88 close(s); 89 return(0); 90 } 91 if (read(s, &c, 1) == 1) { 92 if (c == '\0') { /* everything is OK */ 93 close(s); 94 return(1); 95 } 96 putchar(c); 97 } 98 while ((n = read(s, &c, 1)) > 0) 99 putchar(c); 100 close(s); 101 return(0); 102 } 103