/* $NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1983, 1993\ The Regents of the University of California. All rights reserved."); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem Exp $"); #endif #endif /* not lint */ /* * The top level of the daemon, the format is heavily borrowed * from rwhod.c. Basically: find out who and where you are; * disconnect all descriptors and ttys, and then endless * loop on waiting for and processing requests */ #include <sys/types.h> #include <sys/socket.h> #include <sys/param.h> #include <protocols/talkd.h> #include <errno.h> #include <paths.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <time.h> #include <unistd.h> #include "extern.h" CTL_MSG request; CTL_RESPONSE response; int sockt = STDIN_FILENO; int debug = 0; int logging = 0; time_t lastmsgtime; char hostname[MAXHOSTNAMELEN + 1]; #define TIMEOUT 30 #define MAXIDLE 120 static void timeout(int); int main(int, char *[]); int main(int argc, char *argv[]) { CTL_MSG *mp = &request; int cc, ch; struct sockaddr ctl_addr; openlog("talkd", LOG_PID, LOG_DAEMON); while ((ch = getopt(argc, argv, "dl")) != -1) switch (ch) { case 'd': debug = 1; break; case 'l': logging = 1; break; default: syslog(LOG_ERR, "Usage: %s [-dl]", getprogname()); exit(1); } if (gethostname(hostname, sizeof hostname) < 0) { syslog(LOG_ERR, "gethostname: %m"); _exit(1); } hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */ if (chdir(_PATH_DEV) < 0) { syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV); _exit(1); } signal(SIGALRM, timeout); alarm(TIMEOUT); for (;;) { memset(&response, 0, sizeof(response)); cc = recv(0, (char *)mp, sizeof (*mp), 0); if (cc != sizeof (*mp)) { if (cc < 0 && errno != EINTR) syslog(LOG_WARNING, "recv: %m"); continue; } mp->l_name[sizeof(mp->l_name) - 1] = '\0'; mp->r_name[sizeof(mp->r_name) - 1] = '\0'; mp->r_tty[sizeof(mp->r_tty) - 1] = '\0'; lastmsgtime = time(0); process_request(mp, &response); tsa2sa(&ctl_addr, &mp->ctl_addr); if (ctl_addr.sa_family != AF_INET) continue; /* can block here, is this what I want? */ cc = sendto(sockt, (char *)&response, sizeof (response), 0, &ctl_addr, sizeof (ctl_addr)); if (cc != sizeof (response)) syslog(LOG_WARNING, "sendto: %m"); } } void timeout(int n) { int save_errno = errno; if (time(0) - lastmsgtime >= MAXIDLE) _exit(0); alarm(TIMEOUT); errno = save_errno; } void tsa2sa(struct sockaddr *sa, const struct talkd_sockaddr *tsa) { (void)memcpy(sa, tsa, sizeof(*tsa)); sa->sa_len = sizeof(*tsa); sa->sa_family = tsa->sa_family; }