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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)talkd.c 8.1 (Berkeley) 6/4/93 31 * $FreeBSD: src/libexec/talkd/talkd.c,v 1.11.2.1 2001/10/18 12:30:42 des Exp $ 32 */ 33 34 /* 35 * The top level of the daemon, the format is heavily borrowed 36 * from rwhod.c. Basically: find out who and where you are; 37 * disconnect all descriptors and ttys, and then endless 38 * loop on waiting for and processing requests 39 */ 40 #include <sys/types.h> 41 #include <sys/socket.h> 42 #include <sys/param.h> 43 #include <protocols/talkd.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <paths.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <syslog.h> 52 #include <time.h> 53 #include <unistd.h> 54 55 #include "extern.h" 56 57 CTL_MSG request; 58 CTL_RESPONSE response; 59 60 int sockt; 61 int debug = 0; 62 long lastmsgtime; 63 64 char hostname[MAXHOSTNAMELEN]; 65 66 #define TIMEOUT 30 67 #define MAXIDLE 120 68 69 int 70 main(int argc, char *argv[]) 71 { 72 CTL_MSG *mp = &request; 73 int cc; 74 75 #ifdef NOTDEF 76 /* 77 * removed so ntalkd can run in tty sandbox 78 */ 79 if (getuid()) 80 errx(1, "getuid: not super-user"); 81 #endif 82 openlog("talkd", LOG_PID, LOG_DAEMON); 83 if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 84 syslog(LOG_ERR, "gethostname: %m"); 85 _exit(1); 86 } 87 hostname[sizeof(hostname) - 1] = '\0'; 88 if (chdir(_PATH_DEV) < 0) { 89 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 90 _exit(1); 91 } 92 if (argc > 1 && strcmp(argv[1], "-d") == 0) 93 debug = 1; 94 signal(SIGALRM, timeout); 95 alarm(TIMEOUT); 96 for (;;) { 97 cc = recv(0, (char *)mp, sizeof (*mp), 0); 98 if (cc != sizeof (*mp)) { 99 if (cc < 0 && errno != EINTR) 100 syslog(LOG_WARNING, "recv: %m"); 101 continue; 102 } 103 lastmsgtime = time(0); 104 process_request(mp, &response); 105 /* can block here, is this what I want? */ 106 mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family); 107 cc = sendto(sockt, (char *)&response, 108 sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, 109 sizeof (mp->ctl_addr)); 110 if (cc != sizeof (response)) 111 syslog(LOG_WARNING, "sendto: %m"); 112 } 113 } 114 115 void 116 timeout(int sig __unused) 117 { 118 int save_errno = errno; 119 120 if (time(0) - lastmsgtime >= MAXIDLE) 121 _exit(0); 122 alarm(TIMEOUT); 123 errno = save_errno; 124 } 125