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 30#ifndef lint 31static const char copyright[] = 32"@(#) Copyright (c) 1983, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34#endif /* not lint */ 35 36#ifndef lint 37#if 0 38static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 39#endif 40static const char rcsid[] = 41 "$FreeBSD: releng/10.3/libexec/talkd/talkd.c 262435 2014-02-24 08:21:49Z brueffer $"; 42#endif /* not lint */ 43 44/* 45 * The top level of the daemon, the format is heavily borrowed 46 * from rwhod.c. Basically: find out who and where you are; 47 * disconnect all descriptors and ttys, and then endless 48 * loop on waiting for and processing requests 49 */ 50#include <sys/types.h> 51#include <sys/socket.h> 52#include <sys/param.h> 53#include <netinet/in.h> 54#include <protocols/talkd.h> 55#include <err.h> 56#include <errno.h> 57#include <paths.h> 58#include <signal.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <syslog.h> 63#include <time.h> 64#include <unistd.h> 65 66#include "extern.h" 67 68static CTL_MSG request; 69static CTL_RESPONSE response; 70 71int debug = 0; 72static long lastmsgtime; 73 74char hostname[MAXHOSTNAMELEN]; 75 76#define TIMEOUT 30 77#define MAXIDLE 120 78 79int 80main(int argc, char *argv[]) 81{ 82 register CTL_MSG *mp = &request; 83 int cc; 84 struct sockaddr ctl_addr; 85 86#ifdef NOTDEF 87 /* 88 * removed so ntalkd can run in tty sandbox 89 */ 90 if (getuid()) 91 errx(1, "getuid: not super-user"); 92#endif 93 openlog("talkd", LOG_PID, LOG_DAEMON); 94 if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 95 syslog(LOG_ERR, "gethostname: %m"); 96 _exit(1); 97 } 98 hostname[sizeof(hostname) - 1] = '\0'; 99 if (chdir(_PATH_DEV) < 0) { 100 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 101 _exit(1); 102 } 103 if (argc > 1 && strcmp(argv[1], "-d") == 0) 104 debug = 1; 105 signal(SIGALRM, timeout); 106 alarm(TIMEOUT); 107 for (;;) { 108 cc = recv(0, (char *)mp, sizeof(*mp), 0); 109 if (cc != sizeof (*mp)) { 110 if (cc < 0 && errno != EINTR) 111 syslog(LOG_WARNING, "recv: %m"); 112 continue; 113 } 114 lastmsgtime = time(0); 115 (void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr)); 116 ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family); 117 ctl_addr.sa_len = sizeof(ctl_addr); 118 process_request(mp, &response); 119 /* can block here, is this what I want? */ 120 cc = sendto(STDIN_FILENO, (char *)&response, 121 sizeof(response), 0, &ctl_addr, sizeof(ctl_addr)); 122 if (cc != sizeof (response)) 123 syslog(LOG_WARNING, "sendto: %m"); 124 } 125} 126 127void 128timeout(int sig __unused) 129{ 130 int save_errno = errno; 131 132 if (time(0) - lastmsgtime >= MAXIDLE) 133 _exit(0); 134 alarm(TIMEOUT); 135 errno = save_errno; 136} 137