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 #if 0 35 #ifndef lint 36 static char sccsid[] = "@(#)startdaemon.c 8.2 (Berkeley) 4/17/94"; 37 #endif /* not lint */ 38 #endif 39 40 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */ 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/socket.h> 45 #include <sys/uio.h> 46 #include <sys/un.h> 47 48 #include <dirent.h> 49 #include <err.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 #include "lp.h" 54 #include "pathnames.h" 55 56 extern uid_t uid, euid; 57 58 /* 59 * Tell the printer daemon that there are new files in the spool directory. 60 */ 61 62 int 63 startdaemon(const struct printer *pp) 64 { 65 struct sockaddr_un un; 66 register int s, n; 67 int connectres; 68 char c; 69 70 s = socket(PF_LOCAL, SOCK_STREAM, 0); 71 if (s < 0) { 72 warn("socket"); 73 return(0); 74 } 75 memset(&un, 0, sizeof(un)); 76 un.sun_family = AF_LOCAL; 77 strcpy(un.sun_path, _PATH_SOCKETNAME); 78 #ifndef SUN_LEN 79 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 80 #endif 81 seteuid(euid); 82 connectres = connect(s, (struct sockaddr *)&un, SUN_LEN(&un)); 83 seteuid(uid); 84 if (connectres < 0) { 85 warn("Unable to connect to %s", _PATH_SOCKETNAME); 86 warnx("Check to see if the master 'lpd' process is running."); 87 (void) close(s); 88 return(0); 89 } 90 91 /* 92 * Avoid overruns without putting artificial limitations on 93 * the length. 94 */ 95 if (writel(s, "\1", pp->printer, "\n", (char *)0) <= 0) { 96 warn("write"); 97 (void) close(s); 98 return(0); 99 } 100 if (read(s, &c, 1) == 1) { 101 if (c == '\0') { /* everything is OK */ 102 (void) close(s); 103 return(1); 104 } 105 putchar(c); 106 } 107 while ((n = read(s, &c, 1)) > 0) 108 putchar(c); 109 (void) close(s); 110 return(0); 111 } 112