1 /* $OpenBSD: startdaemon.c,v 1.5 2001/11/23 03:58:17 deraadt 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 1.5 2001/11/23 03:58:17 deraadt Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 #include <sys/socket.h> 46 #include <sys/un.h> 47 48 #include <dirent.h> 49 #include <errno.h> 50 #include <stdio.h> 51 #include <unistd.h> 52 #include <string.h> 53 #include "lp.h" 54 #include "pathnames.h" 55 56 extern uid_t uid, euid; 57 58 static void perr __P((char *)); 59 60 /* 61 * Tell the printer daemon that there are new files in the spool directory. 62 */ 63 64 int 65 startdaemon(printer) 66 char *printer; 67 { 68 struct sockaddr_un un; 69 int s, n; 70 char buf[BUFSIZ]; 71 72 s = socket(AF_UNIX, SOCK_STREAM, 0); 73 if (s < 0) { 74 perr("socket"); 75 return(0); 76 } 77 memset(&un, 0, sizeof(un)); 78 un.sun_family = AF_UNIX; 79 strcpy(un.sun_path, _PATH_SOCKETNAME); 80 #ifndef SUN_LEN 81 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 82 #endif 83 seteuid(euid); 84 siginterrupt(SIGINT, 1); 85 if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) { 86 if (errno == EINTR && gotintr) { 87 siginterrupt(SIGINT, 0); 88 seteuid(uid); 89 close(s); 90 return(0); 91 } 92 siginterrupt(SIGINT, 0); 93 seteuid(uid); 94 perr("connect"); 95 (void) close(s); 96 return(0); 97 } 98 siginterrupt(SIGINT, 0); 99 seteuid(uid); 100 if (snprintf(buf, sizeof buf, "\1%s\n", printer) > sizeof buf-1) { 101 close(s); 102 return (0); 103 } 104 n = strlen(buf); 105 106 /* XXX atomicio inside siginterrupt? */ 107 if (write(s, buf, n) != n) { 108 perr("write"); 109 (void) close(s); 110 return(0); 111 } 112 if (read(s, buf, 1) == 1) { 113 if (buf[0] == '\0') { /* everything is OK */ 114 (void) close(s); 115 return(1); 116 } 117 putchar(buf[0]); 118 } 119 while ((n = read(s, buf, sizeof(buf))) > 0) 120 fwrite(buf, 1, n, stdout); 121 122 (void) close(s); 123 return(0); 124 } 125 126 static void 127 perr(msg) 128 char *msg; 129 { 130 extern char *name; 131 132 (void)printf("%s: %s: %s\n", name, msg, strerror(errno)); 133 } 134