talkd.c revision 45422
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 3531491Scharnierstatic const 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 4131491Scharnier#if 0 421592Srgrimesstatic char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 4331491Scharnier#endif 4431491Scharnierstatic const char rcsid[] = 4545422Sbrian "$Id: talkd.c,v 1.9 1998/12/01 21:12:57 dillon Exp $"; 461592Srgrimes#endif /* not lint */ 471592Srgrimes 481592Srgrimes/* 491592Srgrimes * The top level of the daemon, the format is heavily borrowed 508870Srgrimes * from rwhod.c. Basically: find out who and where you are; 511592Srgrimes * disconnect all descriptors and ttys, and then endless 521592Srgrimes * loop on waiting for and processing requests 531592Srgrimes */ 541592Srgrimes#include <sys/types.h> 551592Srgrimes#include <sys/socket.h> 565111Sache#include <sys/param.h> 571592Srgrimes#include <protocols/talkd.h> 5831491Scharnier#include <err.h> 5931491Scharnier#include <errno.h> 6031491Scharnier#include <paths.h> 611592Srgrimes#include <signal.h> 6231491Scharnier#include <stdio.h> 6331491Scharnier#include <stdlib.h> 6431491Scharnier#include <string.h> 651592Srgrimes#include <syslog.h> 661592Srgrimes#include <time.h> 671592Srgrimes#include <unistd.h> 681592Srgrimes 691592SrgrimesCTL_MSG request; 701592SrgrimesCTL_RESPONSE response; 711592Srgrimes 721592Srgrimesint sockt; 731592Srgrimesint debug = 0; 741592Srgrimeslong lastmsgtime; 751592Srgrimes 7645422Sbrianchar hostname[MAXHOSTNAMELEN]; 771592Srgrimes 781592Srgrimes#define TIMEOUT 30 791592Srgrimes#define MAXIDLE 120 801592Srgrimes 8131491Scharniervoid process_request __P((CTL_MSG *, CTL_RESPONSE *)); 8231491Scharniervoid timeout(); 8331491Scharnier 8431491Scharnierint 851592Srgrimesmain(argc, argv) 861592Srgrimes int argc; 871592Srgrimes char *argv[]; 881592Srgrimes{ 891592Srgrimes register CTL_MSG *mp = &request; 901592Srgrimes int cc; 911592Srgrimes 9241440Sdillon#ifdef NOTDEF 9341440Sdillon /* 9441440Sdillon * removed so ntalkd can run in tty sandbox 9541440Sdillon */ 9631491Scharnier if (getuid()) 9731491Scharnier errx(1, "getuid: not super-user"); 9841440Sdillon#endif 991592Srgrimes openlog("talkd", LOG_PID, LOG_DAEMON); 10045422Sbrian if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 1011592Srgrimes syslog(LOG_ERR, "gethostname: %m"); 1021592Srgrimes _exit(1); 1031592Srgrimes } 10445422Sbrian hostname[sizeof(hostname) - 1] = '\0'; 1051592Srgrimes if (chdir(_PATH_DEV) < 0) { 1061592Srgrimes syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 1071592Srgrimes _exit(1); 1081592Srgrimes } 1091592Srgrimes if (argc > 1 && strcmp(argv[1], "-d") == 0) 1101592Srgrimes debug = 1; 1111592Srgrimes signal(SIGALRM, timeout); 1121592Srgrimes alarm(TIMEOUT); 1131592Srgrimes for (;;) { 1141592Srgrimes cc = recv(0, (char *)mp, sizeof (*mp), 0); 1151592Srgrimes if (cc != sizeof (*mp)) { 1161592Srgrimes if (cc < 0 && errno != EINTR) 1171592Srgrimes syslog(LOG_WARNING, "recv: %m"); 1181592Srgrimes continue; 1191592Srgrimes } 1201592Srgrimes lastmsgtime = time(0); 1211592Srgrimes process_request(mp, &response); 1221592Srgrimes /* can block here, is this what I want? */ 12321838Spst mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family); 1241592Srgrimes cc = sendto(sockt, (char *)&response, 1251592Srgrimes sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, 1261592Srgrimes sizeof (mp->ctl_addr)); 1271592Srgrimes if (cc != sizeof (response)) 1281592Srgrimes syslog(LOG_WARNING, "sendto: %m"); 1291592Srgrimes } 1301592Srgrimes} 1311592Srgrimes 1321592Srgrimesvoid 1331592Srgrimestimeout() 1341592Srgrimes{ 1351592Srgrimes 1361592Srgrimes if (time(0) - lastmsgtime >= MAXIDLE) 1371592Srgrimes _exit(0); 1381592Srgrimes alarm(TIMEOUT); 1391592Srgrimes} 140