talkd.c revision 1592
11592Srgrimes/* 21592Srgrimes * Copyright (c) 1983, 1993 31592Srgrimes * The Regents of the University of California. All rights reserved. 41592Srgrimes * 51592Srgrimes * Redistribution and use in source and binary forms, with or without 61592Srgrimes * modification, are permitted provided that the following conditions 71592Srgrimes * are met: 81592Srgrimes * 1. Redistributions of source code must retain the above copyright 91592Srgrimes * notice, this list of conditions and the following disclaimer. 101592Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111592Srgrimes * notice, this list of conditions and the following disclaimer in the 121592Srgrimes * documentation and/or other materials provided with the distribution. 131592Srgrimes * 3. All advertising materials mentioning features or use of this software 141592Srgrimes * must display the following acknowledgement: 151592Srgrimes * This product includes software developed by the University of 161592Srgrimes * California, Berkeley and its contributors. 171592Srgrimes * 4. Neither the name of the University nor the names of its contributors 181592Srgrimes * may be used to endorse or promote products derived from this software 191592Srgrimes * without specific prior written permission. 201592Srgrimes * 211592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311592Srgrimes * SUCH DAMAGE. 321592Srgrimes */ 331592Srgrimes 341592Srgrimes#ifndef lint 351592Srgrimesstatic char copyright[] = 361592Srgrimes"@(#) Copyright (c) 1983, 1993\n\ 371592Srgrimes The Regents of the University of California. All rights reserved.\n"; 381592Srgrimes#endif /* not lint */ 391592Srgrimes 401592Srgrimes#ifndef lint 411592Srgrimesstatic char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 421592Srgrimes#endif /* not lint */ 431592Srgrimes 441592Srgrimes/* 451592Srgrimes * The top level of the daemon, the format is heavily borrowed 461592Srgrimes * from rwhod.c. Basically: find out who and where you are; 471592Srgrimes * disconnect all descriptors and ttys, and then endless 481592Srgrimes * loop on waiting for and processing requests 491592Srgrimes */ 501592Srgrimes#include <sys/types.h> 511592Srgrimes#include <sys/socket.h> 521592Srgrimes#include <protocols/talkd.h> 531592Srgrimes#include <signal.h> 541592Srgrimes#include <syslog.h> 551592Srgrimes#include <time.h> 561592Srgrimes#include <errno.h> 571592Srgrimes#include <unistd.h> 581592Srgrimes#include <stdio.h> 591592Srgrimes#include <stdlib.h> 601592Srgrimes#include <string.h> 611592Srgrimes#include <paths.h> 621592Srgrimes 631592SrgrimesCTL_MSG request; 641592SrgrimesCTL_RESPONSE response; 651592Srgrimes 661592Srgrimesint sockt; 671592Srgrimesint debug = 0; 681592Srgrimesvoid timeout(); 691592Srgrimeslong lastmsgtime; 701592Srgrimes 711592Srgrimeschar hostname[32]; 721592Srgrimes 731592Srgrimes#define TIMEOUT 30 741592Srgrimes#define MAXIDLE 120 751592Srgrimes 761592Srgrimesmain(argc, argv) 771592Srgrimes int argc; 781592Srgrimes char *argv[]; 791592Srgrimes{ 801592Srgrimes register CTL_MSG *mp = &request; 811592Srgrimes int cc; 821592Srgrimes 831592Srgrimes if (getuid()) { 841592Srgrimes fprintf(stderr, "%s: getuid: not super-user\n", argv[0]); 851592Srgrimes exit(1); 861592Srgrimes } 871592Srgrimes openlog("talkd", LOG_PID, LOG_DAEMON); 881592Srgrimes if (gethostname(hostname, sizeof (hostname) - 1) < 0) { 891592Srgrimes syslog(LOG_ERR, "gethostname: %m"); 901592Srgrimes _exit(1); 911592Srgrimes } 921592Srgrimes if (chdir(_PATH_DEV) < 0) { 931592Srgrimes syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 941592Srgrimes _exit(1); 951592Srgrimes } 961592Srgrimes if (argc > 1 && strcmp(argv[1], "-d") == 0) 971592Srgrimes debug = 1; 981592Srgrimes signal(SIGALRM, timeout); 991592Srgrimes alarm(TIMEOUT); 1001592Srgrimes for (;;) { 1011592Srgrimes extern int errno; 1021592Srgrimes 1031592Srgrimes cc = recv(0, (char *)mp, sizeof (*mp), 0); 1041592Srgrimes if (cc != sizeof (*mp)) { 1051592Srgrimes if (cc < 0 && errno != EINTR) 1061592Srgrimes syslog(LOG_WARNING, "recv: %m"); 1071592Srgrimes continue; 1081592Srgrimes } 1091592Srgrimes lastmsgtime = time(0); 1101592Srgrimes process_request(mp, &response); 1111592Srgrimes /* can block here, is this what I want? */ 1121592Srgrimes cc = sendto(sockt, (char *)&response, 1131592Srgrimes sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, 1141592Srgrimes sizeof (mp->ctl_addr)); 1151592Srgrimes if (cc != sizeof (response)) 1161592Srgrimes syslog(LOG_WARNING, "sendto: %m"); 1171592Srgrimes } 1181592Srgrimes} 1191592Srgrimes 1201592Srgrimesvoid 1211592Srgrimestimeout() 1221592Srgrimes{ 1231592Srgrimes 1241592Srgrimes if (time(0) - lastmsgtime >= MAXIDLE) 1251592Srgrimes _exit(0); 1261592Srgrimes alarm(TIMEOUT); 1271592Srgrimes} 128