1 /* $OpenBSD: startdaemon.c,v 1.18 2019/07/03 03:24:03 deraadt Exp $ */ 2 /* $NetBSD: startdaemon.c,v 1.10 1998/07/18 05:04:39 lukem Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/socket.h> 34 #include <sys/un.h> 35 36 #include <dirent.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <stdio.h> 40 #include <unistd.h> 41 #include <limits.h> 42 #include <string.h> 43 #include <signal.h> 44 45 #include "lp.h" 46 #include "pathnames.h" 47 48 /* 49 * Tell the printer daemon that there are new files in the spool directory. 50 */ 51 int 52 startdaemon(char *printer) 53 { 54 struct sockaddr_un un; 55 int s; 56 size_t n; 57 char buf[BUFSIZ]; 58 59 s = socket(AF_UNIX, SOCK_STREAM, 0); 60 if (s < 0) { 61 warn("socket"); 62 return(0); 63 } 64 memset(&un, 0, sizeof(un)); 65 un.sun_family = AF_UNIX; 66 strlcpy(un.sun_path, _PATH_SOCKETNAME, sizeof(un.sun_path)); 67 siginterrupt(SIGINT, 1); 68 PRIV_START; 69 if (connect(s, (struct sockaddr *)&un, sizeof(un)) < 0) { 70 int saved_errno = errno; 71 if (errno == EINTR && gotintr) { 72 PRIV_END; 73 siginterrupt(SIGINT, 0); 74 close(s); 75 return(0); 76 } 77 PRIV_END; 78 siginterrupt(SIGINT, 0); 79 warnc(saved_errno, "connect"); 80 (void)close(s); 81 return(0); 82 } 83 PRIV_END; 84 siginterrupt(SIGINT, 0); 85 if ((n = snprintf(buf, sizeof(buf), "\1%s\n", printer)) < 0 || 86 n >= sizeof(buf)) { 87 close(s); 88 return (0); 89 } 90 91 /* XXX atomicio inside siginterrupt? */ 92 if (write(s, buf, n) != n) { 93 warn("write"); 94 (void)close(s); 95 return(0); 96 } 97 if (read(s, buf, 1) == 1) { 98 if (buf[0] == '\0') { /* everything is OK */ 99 (void)close(s); 100 return(1); 101 } 102 putchar(buf[0]); 103 } 104 while ((n = read(s, buf, sizeof(buf))) > 0) 105 fwrite(buf, 1, n, stdout); 106 (void)close(s); 107 return(0); 108 } 109