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 * $Id$ 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 44 #endif /* not lint */ 45 46 /* 47 * The top level of the daemon, the format is heavily borrowed 48 * from rwhod.c. Basically: find out who and where you are; 49 * disconnect all descriptors and ttys, and then endless 50 * loop on waiting for and processing requests 51 */ 52 #include <sys/types.h> 53 #include <sys/socket.h> 54 #include <sys/param.h> 55 #include <protocols/talkd.h> 56 #include <signal.h> 57 #include <syslog.h> 58 #include <time.h> 59 #include <errno.h> 60 #include <unistd.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <paths.h> 65 66 CTL_MSG request; 67 CTL_RESPONSE response; 68 69 int sockt; 70 int debug = 0; 71 void timeout(); 72 long lastmsgtime; 73 74 char hostname[MAXHOSTNAMELEN]; 75 76 #define TIMEOUT 30 77 #define MAXIDLE 120 78 79 main(argc, argv) 80 int argc; 81 char *argv[]; 82 { 83 register CTL_MSG *mp = &request; 84 int cc; 85 86 if (getuid()) { 87 fprintf(stderr, "%s: getuid: not super-user\n", argv[0]); 88 exit(1); 89 } 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 if (chdir(_PATH_DEV) < 0) { 96 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 97 _exit(1); 98 } 99 if (argc > 1 && strcmp(argv[1], "-d") == 0) 100 debug = 1; 101 signal(SIGALRM, timeout); 102 alarm(TIMEOUT); 103 for (;;) { 104 extern int errno; 105 106 cc = recv(0, (char *)mp, sizeof (*mp), 0); 107 if (cc != sizeof (*mp)) { 108 if (cc < 0 && errno != EINTR) 109 syslog(LOG_WARNING, "recv: %m"); 110 continue; 111 } 112 lastmsgtime = time(0); 113 process_request(mp, &response); 114 /* can block here, is this what I want? */ 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 { 126 127 if (time(0) - lastmsgtime >= MAXIDLE) 128 _exit(0); 129 alarm(TIMEOUT); 130 } 131