| | 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 | * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. |
| | 34 | * @(#)talkd.c 8.1 (Berkeley) 6/4/93 |
| | 35 | * $FreeBSD: src/libexec/talkd/talkd.c,v 1.11.2.1 2001/10/18 12:30:42 des Exp $ |
| | 36 | * $DragonFly: src/libexec/talkd/talkd.c,v 1.3 2003/11/14 03:54:31 dillon Exp $ |
| | 37 | */ |
| | 38 | |
| | 39 | /* |
| | 40 | * The top level of the daemon, the format is heavily borrowed |
| | 41 | * from rwhod.c. Basically: find out who and where you are; |
| | 42 | * disconnect all descriptors and ttys, and then endless |
| | 43 | * loop on waiting for and processing requests |
| | 44 | */ |
| | 45 | #include <sys/types.h> |
| | 46 | #include <sys/socket.h> |
| | 47 | #include <sys/param.h> |
| | 48 | #include <protocols/talkd.h> |
| | 49 | #include <err.h> |
| | 50 | #include <errno.h> |
| | 51 | #include <paths.h> |
| | 52 | #include <signal.h> |
| | 53 | #include <stdio.h> |
| | 54 | #include <stdlib.h> |
| | 55 | #include <string.h> |
| | 56 | #include <syslog.h> |
| | 57 | #include <time.h> |
| | 58 | #include <unistd.h> |
| | 59 | |
| | 60 | CTL_MSG request; |
| | 61 | CTL_RESPONSE response; |
| | 62 | |
| | 63 | int sockt; |
| | 64 | int debug = 0; |
| | 65 | long lastmsgtime; |
| | 66 | |
| | 67 | char hostname[MAXHOSTNAMELEN]; |
| | 68 | |
| | 69 | #define TIMEOUT 30 |
| | 70 | #define MAXIDLE 120 |
| | 71 | |
| | 72 | void process_request (CTL_MSG *, CTL_RESPONSE *); |
| | 73 | void timeout(); |
| | 74 | |
| | 75 | int |
| | 76 | main(argc, argv) |
| | 77 | int argc; |
| | 78 | char *argv[]; |
| | 79 | { |
| | 80 | register CTL_MSG *mp = &request; |
| | 81 | int cc; |
| | 82 | |
| | 83 | #ifdef NOTDEF |
| | 84 | /* |
| | 85 | * removed so ntalkd can run in tty sandbox |
| | 86 | */ |
| | 87 | if (getuid()) |
| | 88 | errx(1, "getuid: not super-user"); |
| | 89 | #endif |
| | 90 | openlog("talkd", LOG_PID, LOG_DAEMON); |
| | 91 | if (gethostname(hostname, sizeof(hostname) - 1) < 0) { |
| | 92 | syslog(LOG_ERR, "gethostname: %m"); |
| | 93 | _exit(1); |
| | 94 | } |
| | 95 | hostname[sizeof(hostname) - 1] = '\0'; |
| | 96 | if (chdir(_PATH_DEV) < 0) { |
| | 97 | syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); |
| | 98 | _exit(1); |
| | 99 | } |
| | 100 | if (argc > 1 && strcmp(argv[1], "-d") == 0) |
| | 101 | debug = 1; |
| | 102 | signal(SIGALRM, timeout); |
| | 103 | alarm(TIMEOUT); |
| | 104 | for (;;) { |
| | 105 | cc = recv(0, (char *)mp, sizeof (*mp), 0); |
| | 106 | if (cc != sizeof (*mp)) { |
| | 107 | if (cc < 0 && errno != EINTR) |
| | 108 | syslog(LOG_WARNING, "recv: %m"); |
| | 109 | continue; |
| | 110 | } |
| | 111 | lastmsgtime = time(0); |
| | 112 | process_request(mp, &response); |
| | 113 | /* can block here, is this what I want? */ |
| | 114 | mp->ctl_addr.sa_family = htons(mp->ctl_addr.sa_family); |
| | 115 | cc = sendto(sockt, (char *)&response, |
| | 116 | sizeof (response), 0, (struct sockaddr *)&mp->ctl_addr, |
| | 117 | sizeof (mp->ctl_addr)); |
| | 118 | if (cc != sizeof (response)) |
| | 119 | syslog(LOG_WARNING, "sendto: %m"); |
| | 120 | } |
| | 121 | } |
| | 122 | |
| | 123 | void |
| | 124 | timeout() |
| | 125 | { |
| | 126 | int save_errno = errno; |
| | 127 | |
| | 128 | if (time(0) - lastmsgtime >= MAXIDLE) |
| | 129 | _exit(0); |
| | 130 | alarm(TIMEOUT); |
| | 131 | errno = save_errno; |
| | 132 | } |
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