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