1 /* 2 * Copyright (c) 1983, 1993 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 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)talkd.c 8.1 (Berkeley) 6/4/93 35 * $FreeBSD: src/libexec/talkd/talkd.c,v 1.11.2.1 2001/10/18 12:30:42 des Exp $ 36 * $DragonFly: src/libexec/talkd/talkd.c,v 1.3 2003/11/14 03:54:31 dillon Exp $ 37 */ 38 39 /* 40 * The top level of the daemon, the format is heavily borrowed 41 * from rwhod.c. Basically: find out who and where you are; 42 * disconnect all descriptors and ttys, and then endless 43 * loop on waiting for and processing requests 44 */ 45 #include <sys/types.h> 46 #include <sys/socket.h> 47 #include <sys/param.h> 48 #include <protocols/talkd.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <syslog.h> 57 #include <time.h> 58 #include <unistd.h> 59 60 CTL_MSG request; 61 CTL_RESPONSE response; 62 63 int sockt; 64 int debug = 0; 65 long lastmsgtime; 66 67 char hostname[MAXHOSTNAMELEN]; 68 69 #define TIMEOUT 30 70 #define MAXIDLE 120 71 72 void process_request (CTL_MSG *, CTL_RESPONSE *); 73 void timeout(); 74 75 int 76 main(argc, argv) 77 int argc; 78 char *argv[]; 79 { 80 register CTL_MSG *mp = &request; 81 int cc; 82 83 #ifdef NOTDEF 84 /* 85 * removed so ntalkd can run in tty sandbox 86 */ 87 if (getuid()) 88 errx(1, "getuid: not super-user"); 89 #endif 90 openlog("talkd", LOG_PID, LOG_DAEMON); 91 if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 92 syslog(LOG_ERR, "gethostname: %m"); 93 _exit(1); 94 } 95 hostname[sizeof(hostname) - 1] = '\0'; 96 if (chdir(_PATH_DEV) < 0) { 97 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 98 _exit(1); 99 } 100 if (argc > 1 && strcmp(argv[1], "-d") == 0) 101 debug = 1; 102 signal(SIGALRM, timeout); 103 alarm(TIMEOUT); 104 for (;;) { 105 cc = recv(0, (char *)mp, sizeof (*mp), 0); 106 if (cc != sizeof (*mp)) { 107 if (cc < 0 && errno != EINTR) 108 syslog(LOG_WARNING, "recv: %m"); 109 continue; 110 } 111 lastmsgtime = time(0); 112 process_request(mp, &response); 113 /* can block here, is this what I want? */ 114 mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family); 115 cc = sendto(sockt, (char *)&response, 116 sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, 117 sizeof (mp->ctl_addr)); 118 if (cc != sizeof (response)) 119 syslog(LOG_WARNING, "sendto: %m"); 120 } 121 } 122 123 void 124 timeout() 125 { 126 int save_errno = errno; 127 128 if (time(0) - lastmsgtime >= MAXIDLE) 129 _exit(0); 130 alarm(TIMEOUT); 131 errno = save_errno; 132 } 133