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