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 * @(#)startdaemon.c 8.2 (Berkeley) 4/17/94 34 * $FreeBSD: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.8.2.2 2002/04/26 18:24:40 gad Exp $ 35 * $DragonFly: src/usr.sbin/lpr/common_source/startdaemon.c,v 1.4 2004/12/18 22:48:03 swildner Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/socket.h> 40 #include <sys/uio.h> 41 #include <sys/un.h> 42 43 #include <dirent.h> 44 #include <err.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include "lp.h" 49 #include "pathnames.h" 50 51 extern uid_t uid, euid; 52 53 /* 54 * Tell the printer daemon that there are new files in the spool directory. 55 */ 56 57 int 58 startdaemon(const struct printer *pp) 59 { 60 struct sockaddr_un un; 61 int s, n; 62 int connectres; 63 char c; 64 65 s = socket(PF_LOCAL, SOCK_STREAM, 0); 66 if (s < 0) { 67 warn("socket"); 68 return(0); 69 } 70 memset(&un, 0, sizeof(un)); 71 un.sun_family = AF_LOCAL; 72 strcpy(un.sun_path, _PATH_SOCKETNAME); 73 #ifndef SUN_LEN 74 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 75 #endif 76 seteuid(euid); 77 connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un)); 78 seteuid(uid); 79 if (connectres < 0) { 80 warn("Unable to connect to %s", _PATH_SOCKETNAME); 81 warnx("Check to see if the master 'lpd' process is running."); 82 close(s); 83 return(0); 84 } 85 86 /* 87 * Avoid overruns without putting artificial limitations on 88 * the length. 89 */ 90 if (writel(s, "\1", pp->printer, "\n", NULL) <= 0) { 91 warn("write"); 92 close(s); 93 return(0); 94 } 95 if (read(s, &c, 1) == 1) { 96 if (c == '\0') { /* everything is OK */ 97 close(s); 98 return(1); 99 } 100 putchar(c); 101 } 102 while ((n = read(s, &c, 1)) > 0) 103 putchar(c); 104 close(s); 105 return(0); 106 } 107