529 lines
14 KiB
C
529 lines
14 KiB
C
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rwhod.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: rwhod.c,v 1.21 2003/07/13 12:13:49 itojun Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/signal.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <protocols/rwhod.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <util.h>
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#include "utmpentry.h"
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/*
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* Alarm interval. Don't forget to change the down time check in ruptime
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* if this is changed.
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*/
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#define AL_INTERVAL (3 * 60)
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char myname[MAXHOSTNAMELEN + 1];
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/*
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* We communicate with each neighbor in a list constructed at the time we're
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* started up. Neighbors are currently directly connected via a hardware
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* interface.
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*/
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struct neighbor {
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struct neighbor *n_next;
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char *n_name; /* interface name */
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struct sockaddr *n_addr; /* who to send to */
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int n_addrlen; /* size of address */
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int n_flags; /* should forward?, interface flags */
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};
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struct neighbor *neighbors;
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struct whod mywd;
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struct servent *sp;
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int s;
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#define WHDRSIZE (sizeof(mywd) - sizeof(mywd.wd_we))
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int configure __P((int));
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void getboottime __P((int));
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int main __P((int, char **));
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void onalrm __P((int));
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void quit __P((char *));
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void rt_xaddrs __P((caddr_t, caddr_t, struct rt_addrinfo *));
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int verify __P((char *));
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#ifdef DEBUG
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char *interval __P((int, char *));
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#define sendto Sendto
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ssize_t Sendto __P((int, const void *,
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size_t, int, const struct sockaddr *, socklen_t));
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#endif
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct sockaddr_in from;
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struct stat st;
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char path[64];
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int on = 1;
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char *cp;
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struct sockaddr_in sin;
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if (getuid())
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errx(1, "not super user");
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sp = getservbyname("who", "udp");
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if (sp == NULL)
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errx(1, "udp/who: unknown service");
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#ifndef DEBUG
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daemon(1, 0);
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pidfile(NULL);
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#endif
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if (chdir(_PATH_RWHODIR) < 0)
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err(1, "%s", _PATH_RWHODIR);
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(void)signal(SIGHUP, getboottime);
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openlog("rwhod", LOG_PID, LOG_DAEMON);
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/*
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* Establish host name as returned by system.
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*/
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if (gethostname(myname, sizeof(myname) - 1) < 0) {
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syslog(LOG_ERR, "gethostname: %m");
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exit(1);
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}
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myname[sizeof(myname) - 1] = '\0';
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if ((cp = strchr(myname, '.')) != NULL)
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*cp = '\0';
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strncpy(mywd.wd_hostname, myname, sizeof(mywd.wd_hostname) - 1);
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getboottime(0);
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "socket: %m");
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exit(1);
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}
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if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
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syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
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exit(1);
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}
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_port = sp->s_port;
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if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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syslog(LOG_ERR, "bind: %m");
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exit(1);
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}
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if (!configure(s))
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exit(1);
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signal(SIGALRM, onalrm);
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onalrm(0);
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for (;;) {
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struct whod wd;
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int cc, whod, len = sizeof(from);
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cc = recvfrom(s, (char *)&wd, sizeof(struct whod), 0,
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(struct sockaddr *)&from, &len);
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if (cc <= 0) {
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if (cc < 0 && errno != EINTR)
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syslog(LOG_WARNING, "recv: %m");
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continue;
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}
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if (from.sin_port != sp->s_port) {
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syslog(LOG_WARNING, "%d: bad from port",
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ntohs(from.sin_port));
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continue;
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}
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if (cc < WHDRSIZE) {
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syslog(LOG_WARNING, "Short packet from %s",
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inet_ntoa(from.sin_addr));
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continue;
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}
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if (wd.wd_vers != WHODVERSION)
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continue;
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if (wd.wd_type != WHODTYPE_STATUS)
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continue;
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/*
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* Ensure null termination of the name within the packet.
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* Otherwise we might overflow or read past the end.
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*/
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wd.wd_hostname[sizeof(wd.wd_hostname)-1] = 0;
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if (!verify(wd.wd_hostname)) {
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syslog(LOG_WARNING, "malformed host name from %s",
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inet_ntoa(from.sin_addr));
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continue;
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}
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snprintf(path, sizeof(path), "whod.%s", wd.wd_hostname);
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/*
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* Rather than truncating and growing the file each time,
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* use ftruncate if size is less than previous size.
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*/
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whod = open(path, O_WRONLY | O_CREAT, 0644);
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if (whod < 0) {
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syslog(LOG_WARNING, "%s: %m", path);
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continue;
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}
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#if ENDIAN != BIG_ENDIAN
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{
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int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
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struct whoent *we;
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/* undo header byte swapping before writing to file */
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wd.wd_sendtime = ntohl(wd.wd_sendtime);
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for (i = 0; i < 3; i++)
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wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
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wd.wd_boottime = ntohl(wd.wd_boottime);
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we = wd.wd_we;
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for (i = 0; i < n; i++) {
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we->we_idle = ntohl(we->we_idle);
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we->we_utmp.out_time =
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ntohl(we->we_utmp.out_time);
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we++;
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}
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}
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#endif
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(void)time((time_t *)&wd.wd_recvtime);
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(void)write(whod, (char *)&wd, cc);
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if (fstat(whod, &st) < 0 || st.st_size > cc)
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ftruncate(whod, cc);
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(void)close(whod);
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}
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}
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/*
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* Check out host name for unprintables
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* and other funnies before allowing a file
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* to be created. Sorry, but blanks aren't allowed.
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*/
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int
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verify(name)
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char *name;
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{
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int size = 0;
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while (*name) {
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if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
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return (0);
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name++, size++;
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}
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return (size > 0);
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}
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int alarmcount;
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void
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onalrm(signo)
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int signo;
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{
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struct neighbor *np;
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struct whoent *we = mywd.wd_we, *wlast;
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int i;
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struct stat stb;
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double avenrun[3];
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time_t now;
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int cc;
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static struct utmpentry *ohead = NULL;
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struct utmpentry *ep;
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int utmpent = 0;
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now = time(NULL);
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if (alarmcount % 10 == 0)
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getboottime(0);
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alarmcount++;
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(void)getutentries(NULL, &ep);
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if (ep != ohead) {
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freeutentries(ep);
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wlast = &mywd.wd_we[1024 / sizeof(struct whoent) - 1];
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for (; ep; ep = ep->next) {
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(void)strncpy(we->we_utmp.out_line, ep->line,
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sizeof(we->we_utmp.out_line) - 1);
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(void)strncpy(we->we_utmp.out_name, ep->name,
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sizeof(we->we_utmp.out_name) - 1);
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we->we_utmp.out_time = htonl(ep->tv.tv_sec);
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if (we >= wlast)
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break;
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we++;
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}
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utmpent = we - mywd.wd_we;
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}
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/*
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* The test on utmpent looks silly---after all, if no one is
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* logged on, why worry about efficiency?---but is useful on
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* (e.g.) compute servers.
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*/
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if (utmpent && chdir(_PATH_DEV)) {
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syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
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exit(1);
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}
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we = mywd.wd_we;
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for (i = 0; i < utmpent; i++) {
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if (stat(we->we_utmp.out_line, &stb) >= 0)
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we->we_idle = htonl(now - stb.st_atime);
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we++;
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}
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(void)getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
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for (i = 0; i < 3; i++)
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mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
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cc = (char *)we - (char *)&mywd;
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mywd.wd_sendtime = htonl(time(0));
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mywd.wd_vers = WHODVERSION;
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mywd.wd_type = WHODTYPE_STATUS;
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for (np = neighbors; np != NULL; np = np->n_next)
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(void)sendto(s, (char *)&mywd, cc, 0,
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np->n_addr, np->n_addrlen);
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if (utmpent && chdir(_PATH_RWHODIR)) {
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syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
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exit(1);
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}
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(void)alarm(AL_INTERVAL);
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}
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void
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getboottime(signo)
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int signo;
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{
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int mib[2];
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size_t size;
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struct timeval tm;
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mib[0] = CTL_KERN;
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mib[1] = KERN_BOOTTIME;
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size = sizeof(tm);
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if (sysctl(mib, 2, &tm, &size, NULL, 0) == -1) {
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syslog(LOG_ERR, "cannot get boottime: %m");
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exit(1);
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}
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mywd.wd_boottime = htonl(tm.tv_sec);
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}
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void
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quit(msg)
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char *msg;
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{
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syslog(LOG_ERR, "%s", msg);
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exit(1);
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}
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
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void
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rt_xaddrs(cp, cplim, rtinfo)
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caddr_t cp, cplim;
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struct rt_addrinfo *rtinfo;
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{
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struct sockaddr *sa;
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int i;
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memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
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for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
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if ((rtinfo->rti_addrs & (1 << i)) == 0)
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continue;
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rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
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ADVANCE(cp, sa);
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}
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}
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/*
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* Figure out device configuration and select
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* networks which deserve status information.
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*/
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int
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configure(s)
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int s;
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{
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struct neighbor *np;
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struct if_msghdr *ifm;
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struct ifa_msghdr *ifam;
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struct sockaddr_dl *sdl;
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size_t needed;
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int mib[6], flags = 0, len;
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char *buf, *lim, *next;
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struct rt_addrinfo info;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_IFLIST;
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mib[5] = 0;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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quit("route-sysctl-estimate");
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if ((buf = malloc(needed)) == NULL)
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quit("malloc");
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
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quit("actual retrieval of interface table");
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lim = buf + needed;
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sdl = NULL; /* XXX just to keep gcc -Wall happy */
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for (next = buf; next < lim; next += ifm->ifm_msglen) {
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ifm = (struct if_msghdr *)next;
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if (ifm->ifm_type == RTM_IFINFO) {
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sdl = (struct sockaddr_dl *)(ifm + 1);
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flags = ifm->ifm_flags;
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continue;
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}
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if ((flags & IFF_UP) == 0 ||
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(flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0)
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continue;
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if (ifm->ifm_type != RTM_NEWADDR)
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quit("out of sync parsing NET_RT_IFLIST");
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ifam = (struct ifa_msghdr *)ifm;
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info.rti_addrs = ifam->ifam_addrs;
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rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
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&info);
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/* gag, wish we could get rid of Internet dependencies */
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#define dstaddr info.rti_info[RTAX_BRD]
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#define IPADDR_SA(x) ((struct sockaddr_in *)(x))->sin_addr.s_addr
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#define PORT_SA(x) ((struct sockaddr_in *)(x))->sin_port
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if (dstaddr == 0 || dstaddr->sa_family != AF_INET)
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continue;
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PORT_SA(dstaddr) = sp->s_port;
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for (np = neighbors; np != NULL; np = np->n_next)
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if (memcmp(sdl->sdl_data, np->n_name,
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sdl->sdl_nlen) == 0 &&
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IPADDR_SA(np->n_addr) == IPADDR_SA(dstaddr))
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break;
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if (np != NULL)
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continue;
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len = sizeof(*np) + dstaddr->sa_len + sdl->sdl_nlen + 1;
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np = (struct neighbor *)malloc(len);
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if (np == NULL)
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quit("malloc of neighbor structure");
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memset(np, 0, len);
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np->n_flags = flags;
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np->n_addr = (struct sockaddr *)(np + 1);
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np->n_addrlen = dstaddr->sa_len;
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np->n_name = np->n_addrlen + (char *)np->n_addr;
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np->n_next = neighbors;
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neighbors = np;
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memcpy((char *)np->n_addr, (char *)dstaddr, np->n_addrlen);
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memcpy(np->n_name, sdl->sdl_data, sdl->sdl_nlen);
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}
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free(buf);
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return (1);
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}
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#ifdef DEBUG
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ssize_t
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Sendto(s, buf, cc, flags, to, tolen)
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int s;
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const void *buf;
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size_t cc;
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int flags;
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const struct sockaddr *to;
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socklen_t tolen;
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{
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struct whod *w = (struct whod *)buf;
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struct whoent *we;
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struct sockaddr_in *sin = (struct sockaddr_in *)to;
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printf("sendto %x.%d\n", ntohl(sin->sin_addr.s_addr),
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ntohs(sin->sin_port));
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printf("hostname %s %s\n", w->wd_hostname,
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interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
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printf("load %4.2f, %4.2f, %4.2f\n",
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ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
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ntohl(w->wd_loadav[2]) / 100.0);
|
|
cc -= WHDRSIZE;
|
|
for (we = w->wd_we, cc /= sizeof(struct whoent); cc > 0; cc--, we++) {
|
|
time_t t = ntohl(we->we_utmp.out_time);
|
|
printf("%-8.8s %s:%s %.12s", we->we_utmp.out_name,
|
|
w->wd_hostname, we->we_utmp.out_line, ctime(&t)+4);
|
|
we->we_idle = ntohl(we->we_idle) / 60;
|
|
if (we->we_idle) {
|
|
if (we->we_idle >= 100*60)
|
|
we->we_idle = 100*60 - 1;
|
|
if (we->we_idle >= 60)
|
|
printf(" %2d", we->we_idle / 60);
|
|
else
|
|
printf(" ");
|
|
printf(":%02d", we->we_idle % 60);
|
|
}
|
|
printf("\n");
|
|
}
|
|
return (ssize_t)cc;
|
|
}
|
|
|
|
char *
|
|
interval(time, updown)
|
|
int time;
|
|
char *updown;
|
|
{
|
|
static char resbuf[32];
|
|
int days, hours, minutes;
|
|
|
|
if (time < 0 || time > 3*30*24*60*60) {
|
|
(void)snprintf(resbuf, sizeof(resbuf), " %s ??:??", updown);
|
|
return (resbuf);
|
|
}
|
|
minutes = (time + 59) / 60; /* round to minutes */
|
|
hours = minutes / 60; minutes %= 60;
|
|
days = hours / 24; hours %= 24;
|
|
if (days)
|
|
(void)snprintf(resbuf, sizeof(resbuf), "%s %2d+%02d:%02d",
|
|
updown, days, hours, minutes);
|
|
else
|
|
(void)snprintf(resbuf, sizeof(resbuf), "%s %2d:%02d",
|
|
updown, hours, minutes);
|
|
return (resbuf);
|
|
}
|
|
#endif
|