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 34#ifndef lint 35__attribute__((__used__)) 36static const char copyright[] = 37"@(#) Copyright (c) 1983, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 44#endif 45__attribute__((__used__)) 46static const char rcsid[] = 47 "$FreeBSD: src/libexec/talkd/talkd.c,v 1.17 2004/06/14 22:44:13 bms Exp $"; 48#endif /* not lint */ 49 50#include <sys/cdefs.h> 51 52/* 53 * The top level of the daemon, the format is heavily borrowed 54 * from rwhod.c. Basically: find out who and where you are; 55 * disconnect all descriptors and ttys, and then endless 56 * loop on waiting for and processing requests 57 */ 58#include <sys/types.h> 59#include <sys/socket.h> 60#include <sys/param.h> 61#include <netinet/in.h> 62#include <protocols/talkd.h> 63#include <err.h> 64#include <errno.h> 65#include <paths.h> 66#include <signal.h> 67#include <stdio.h> 68#include <stdlib.h> 69#include <string.h> 70#include <syslog.h> 71#include <time.h> 72#include <unistd.h> 73 74#include "extern.h" 75 76CTL_MSG request; 77CTL_RESPONSE response; 78 79int debug = 0; 80long lastmsgtime; 81 82char hostname[MAXHOSTNAMELEN + 1]; 83 84#define TIMEOUT 30 85#define MAXIDLE 120 86 87int 88main(int argc, char *argv[]) 89{ 90 register CTL_MSG *mp = &request; 91 int cc; 92 struct sockaddr ctl_addr; 93 94 /* 95 * removed so ntalkd can run in tty sandbox 96 */ 97 if (getuid()) 98 errx(1, "getuid: not super-user"); 99 100 openlog("talkd", LOG_PID, LOG_DAEMON); 101 if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 102 syslog(LOG_ERR, "gethostname: %m"); 103 _exit(1); 104 } 105 hostname[sizeof(hostname) - 1] = '\0'; 106 if (chdir(_PATH_DEV) < 0) { 107 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 108 _exit(1); 109 } 110 if (argc > 1 && strcmp(argv[1], "-d") == 0) 111 debug = 1; 112 signal(SIGALRM, timeout); 113 alarm(TIMEOUT); 114 for (;;) { 115 cc = recv(0, (char *)mp, sizeof(*mp), 0); 116 if (cc != sizeof (*mp)) { 117 if (cc < 0 && errno != EINTR) 118 syslog(LOG_WARNING, "recv: %m"); 119 continue; 120 } 121 lastmsgtime = time(0); 122 (void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr)); 123 ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family); 124 ctl_addr.sa_len = sizeof(ctl_addr); 125 process_request(mp, &response); 126 /* can block here, is this what I want? */ 127 cc = sendto(STDIN_FILENO, (char *)&response, 128 sizeof(response), 0, &ctl_addr, sizeof(ctl_addr)); 129 if (cc != sizeof (response)) 130 syslog(LOG_WARNING, "sendto: %m"); 131 } 132 /* NOTREACHED */ 133 return 0; 134} 135 136void 137timeout(int sig __unused) 138{ 139 int save_errno = errno; 140 141 if (time(0) - lastmsgtime >= MAXIDLE) 142 _exit(0); 143 alarm(TIMEOUT); 144 errno = save_errno; 145} 146