1 /* $OpenBSD: startdaemon.c,v 1.6 2001/12/06 03:12:30 ericj 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 1.6 2001/12/06 03:12:30 ericj 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 /* 59 * Tell the printer daemon that there are new files in the spool directory. 60 */ 61 62 int 63 startdaemon(printer) 64 char *printer; 65 { 66 struct sockaddr_un un; 67 int s, n; 68 char buf[BUFSIZ]; 69 70 s = socket(AF_UNIX, SOCK_STREAM, 0); 71 if (s < 0) { 72 perror("socket"); 73 return(0); 74 } 75 memset(&un, 0, sizeof(un)); 76 un.sun_family = AF_UNIX; 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 siginterrupt(SIGINT, 1); 83 if (connect(s, (struct sockaddr *)&un, SUN_LEN(&un)) < 0) { 84 if (errno == EINTR && gotintr) { 85 siginterrupt(SIGINT, 0); 86 seteuid(uid); 87 close(s); 88 return(0); 89 } 90 siginterrupt(SIGINT, 0); 91 seteuid(uid); 92 perror("connect"); 93 (void) close(s); 94 return(0); 95 } 96 siginterrupt(SIGINT, 0); 97 seteuid(uid); 98 if (snprintf(buf, sizeof buf, "\1%s\n", printer) > sizeof buf-1) { 99 close(s); 100 return (0); 101 } 102 n = strlen(buf); 103 104 /* XXX atomicio inside siginterrupt? */ 105 if (write(s, buf, n) != n) { 106 perror("write"); 107 (void) close(s); 108 return(0); 109 } 110 if (read(s, buf, 1) == 1) { 111 if (buf[0] == '\0') { /* everything is OK */ 112 (void) close(s); 113 return(1); 114 } 115 putchar(buf[0]); 116 } 117 while ((n = read(s, buf, sizeof(buf))) > 0) 118 fwrite(buf, 1, n, stdout); 119 120 (void) close(s); 121 return(0); 122 } 123