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 <netinet/in.h> 58 #include <protocols/talkd.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <paths.h> 62 #include <signal.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <string.h> 66 #include <syslog.h> 67 #include <time.h> 68 #include <unistd.h> 69 70 #include "extern.h" 71 72 CTL_MSG request; 73 CTL_RESPONSE response; 74 75 int sockt; 76 int debug = 0; 77 long lastmsgtime; 78 79 char hostname[MAXHOSTNAMELEN]; 80 81 #define TIMEOUT 30 82 #define MAXIDLE 120 83 84 int 85 main(int argc, char *argv[]) 86 { 87 register CTL_MSG *mp = &request; 88 int cc; 89 90 #ifdef NOTDEF 91 /* 92 * removed so ntalkd can run in tty sandbox 93 */ 94 if (getuid()) 95 errx(1, "getuid: not super-user"); 96 #endif 97 openlog("talkd", LOG_PID, LOG_DAEMON); 98 if (gethostname(hostname, sizeof(hostname) - 1) < 0) { 99 syslog(LOG_ERR, "gethostname: %m"); 100 _exit(1); 101 } 102 hostname[sizeof(hostname) - 1] = '\0'; 103 if (chdir(_PATH_DEV) < 0) { 104 syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); 105 _exit(1); 106 } 107 if (argc > 1 && strcmp(argv[1], "-d") == 0) 108 debug = 1; 109 signal(SIGALRM, timeout); 110 alarm(TIMEOUT); 111 for (;;) { 112 cc = recv(0, (char *)mp, sizeof (*mp), 0); 113 if (cc != sizeof (*mp)) { 114 if (cc < 0 && errno != EINTR) 115 syslog(LOG_WARNING, "recv: %m"); 116 continue; 117 } 118 lastmsgtime = time(0); 119 process_request(mp, &response); 120 /* can block here, is this what I want? */ 121 mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family); 122 cc = sendto(sockt, (char *)&response, 123 sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, 124 sizeof (mp->ctl_addr)); 125 if (cc != sizeof (response)) 126 syslog(LOG_WARNING, "sendto: %m"); 127 } 128 } 129 130 void 131 timeout(int sig __unused) 132 { 133 int save_errno = errno; 134 135 if (time(0) - lastmsgtime >= MAXIDLE) 136 _exit(0); 137 alarm(TIMEOUT); 138 errno = save_errno; 139 } 140