1 /* $OpenBSD: startdaemon.c,v 1.4 2001/08/30 17:38:13 millert 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static const char sccsid[] = "@(#)startdaemon.c 8.2 (Berkeley) 4/17/94"; 39 #else 40 static const char rcsid[] = "$OpenBSD: startdaemon.c,v 1.4 2001/08/30 17:38:13 millert Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 45 #include <sys/param.h> 46 #include <sys/socket.h> 47 #include <sys/un.h> 48 49 #include <dirent.h> 50 #include <errno.h> 51 #include <stdio.h> 52 #include <unistd.h> 53 #include <string.h> 54 #include "lp.h" 55 #include "pathnames.h" 56 57 extern uid_t uid, euid; 58 59 static void perr __P((char *)); 60 61 /* 62 * Tell the printer daemon that there are new files in the spool directory. 63 */ 64 65 int 66 startdaemon(printer) 67 char *printer; 68 { 69 struct sockaddr_un un; 70 int s, n; 71 char buf[BUFSIZ]; 72 73 s = socket(AF_UNIX, SOCK_STREAM, 0); 74 if (s < 0) { 75 perr("socket"); 76 return(0); 77 } 78 memset(&un, 0, sizeof(un)); 79 un.sun_family = AF_UNIX; 80 strcpy(un.sun_path, _PATH_SOCKETNAME); 81 #ifndef SUN_LEN 82 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 83 #endif 84 seteuid(euid); 85 if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) { 86 seteuid(uid); 87 perr("connect"); 88 (void) close(s); 89 return(0); 90 } 91 seteuid(uid); 92 if (snprintf(buf, sizeof buf, "\1%s\n", printer) > sizeof buf-1) { 93 close(s); 94 return (0); 95 } 96 n = strlen(buf); 97 if (write(s, buf, n) != n) { 98 perr("write"); 99 (void) close(s); 100 return(0); 101 } 102 if (read(s, buf, 1) == 1) { 103 if (buf[0] == '\0') { /* everything is OK */ 104 (void) close(s); 105 return(1); 106 } 107 putchar(buf[0]); 108 } 109 while ((n = read(s, buf, sizeof(buf))) > 0) 110 fwrite(buf, 1, n, stdout); 111 (void) close(s); 112 return(0); 113 } 114 115 static void 116 perr(msg) 117 char *msg; 118 { 119 extern char *name; 120 121 (void)printf("%s: %s: %s\n", name, msg, strerror(errno)); 122 } 123