1 /* $NetBSD: talkd.c,v 1.16 2002/11/20 21:01:57 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) 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 #if 0 44 static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; 45 #else 46 __RCSID("$NetBSD: talkd.c,v 1.16 2002/11/20 21:01:57 itojun Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * The top level of the daemon, the format is heavily borrowed 52 * from rwhod.c. Basically: find out who and where you are; 53 * disconnect all descriptors and ttys, and then endless 54 * loop on waiting for and processing requests 55 */ 56 #include <sys/types.h> 57 #include <sys/socket.h> 58 #include <sys/param.h> 59 60 #include <protocols/talkd.h> 61 62 #include <errno.h> 63 #include <paths.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include <time.h> 70 #include <unistd.h> 71 72 #include "extern.h" 73 74 CTL_MSG request; 75 CTL_RESPONSE response; 76 77 int sockt = STDIN_FILENO; 78 int debug = 0; 79 int logging = 0; 80 long lastmsgtime; 81 82 char hostname[MAXHOSTNAMELEN + 1]; 83 84 #define TIMEOUT 30 85 #define MAXIDLE 120 86 87 static void timeout __P((int)); 88 int main __P((int, char *[])); 89 90 int 91 main(argc, argv) 92 int argc; 93 char *argv[]; 94 { 95 CTL_MSG *mp = &request; 96 int cc, ch; 97 struct sockaddr ctl_addr; 98 99 openlog("talkd", LOG_PID, LOG_DAEMON); 100 while ((ch = getopt(argc, argv, "dl")) != -1) 101 switch (ch) { 102 case 'd': 103 debug = 1; 104 break; 105 case 'l': 106 logging = 1; 107 break; 108 default: 109 syslog(LOG_ERR, "Usage: %s [-dl]", getprogname()); 110 exit(1); 111 } 112 113 if (gethostname(hostname, sizeof hostname) < 0) { 114 syslog(LOG_ERR, "gethostname: %m"); 115 _exit(1); 116 } 117 hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */ 118 if (chdir(_PATH_DEV) < 0) { 119 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 120 _exit(1); 121 } 122 signal(SIGALRM, timeout); 123 alarm(TIMEOUT); 124 for (;;) { 125 memset(&response, 0, sizeof(response)); 126 cc = recv(0, (char *)mp, sizeof (*mp), 0); 127 if (cc != sizeof (*mp)) { 128 if (cc < 0 && errno != EINTR) 129 syslog(LOG_WARNING, "recv: %m"); 130 continue; 131 } 132 133 mp->l_name[sizeof(mp->l_name) - 1] = '\0'; 134 mp->r_name[sizeof(mp->r_name) - 1] = '\0'; 135 mp->r_tty[sizeof(mp->r_tty) - 1] = '\0'; 136 137 lastmsgtime = time(0); 138 process_request(mp, &response); 139 140 (void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr)); 141 ctl_addr.sa_family = mp->ctl_addr.sa_family; 142 ctl_addr.sa_len = sizeof(ctl_addr); 143 if (ctl_addr.sa_family != AF_INET) 144 continue; 145 146 /* can block here, is this what I want? */ 147 cc = sendto(sockt, (char *)&response, sizeof (response), 0, 148 &ctl_addr, sizeof (ctl_addr)); 149 if (cc != sizeof (response)) 150 syslog(LOG_WARNING, "sendto: %m"); 151 } 152 } 153 154 void 155 timeout(n) 156 int n; 157 { 158 int save_errno = errno; 159 160 if (time(0) - lastmsgtime >= MAXIDLE) 161 _exit(0); 162 alarm(TIMEOUT); 163 errno = save_errno; 164 } 165