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BSD 4_3_Net_2 release
[unix-history] / usr / src / usr.sbin / rwhod / rwhod.c
/*
* Copyright (c) 1983 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)rwhod.c 5.20 (Berkeley) 3/2/91";
#endif /* not lint */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <net/if.h>
#include <netinet/in.h>
#include <nlist.h>
#include <errno.h>
#include <utmp.h>
#include <ctype.h>
#include <netdb.h>
#include <syslog.h>
#include <protocols/rwhod.h>
#include <stdio.h>
#include <paths.h>
/*
* Alarm interval. Don't forget to change the down time check in ruptime
* if this is changed.
*/
#define AL_INTERVAL (3 * 60)
struct sockaddr_in sin;
char myname[MAXHOSTNAMELEN];
struct nlist nl[] = {
#define NL_BOOTTIME 0
{ "_boottime" },
0
};
/*
* We communicate with each neighbor in
* a list constructed at the time we're
* started up. Neighbors are currently
* directly connected via a hardware interface.
*/
struct neighbor {
struct neighbor *n_next;
char *n_name; /* interface name */
char *n_addr; /* who to send to */
int n_addrlen; /* size of address */
int n_flags; /* should forward?, interface flags */
};
struct neighbor *neighbors;
struct whod mywd;
struct servent *sp;
int s, utmpf, kmemf = -1;
#define WHDRSIZE (sizeof (mywd) - sizeof (mywd.wd_we))
extern int errno;
char *strcpy(), *malloc();
long lseek();
void getkmem(), onalrm();
struct in_addr inet_makeaddr();
main()
{
struct sockaddr_in from;
struct stat st;
char path[64];
int on = 1;
char *cp, *index(), *strerror();
if (getuid()) {
fprintf(stderr, "rwhod: not super user\n");
exit(1);
}
sp = getservbyname("who", "udp");
if (sp == 0) {
fprintf(stderr, "rwhod: udp/who: unknown service\n");
exit(1);
}
#ifndef DEBUG
daemon(1, 0);
#endif
if (chdir(_PATH_RWHODIR) < 0) {
(void)fprintf(stderr, "rwhod: %s: %s\n",
_PATH_RWHODIR, strerror(errno));
exit(1);
}
(void) signal(SIGHUP, getkmem);
openlog("rwhod", LOG_PID, LOG_DAEMON);
/*
* Establish host name as returned by system.
*/
if (gethostname(myname, sizeof (myname) - 1) < 0) {
syslog(LOG_ERR, "gethostname: %m");
exit(1);
}
if ((cp = index(myname, '.')) != NULL)
*cp = '\0';
strncpy(mywd.wd_hostname, myname, sizeof (myname) - 1);
utmpf = open(_PATH_UTMP, O_RDONLY|O_CREAT, 0644);
if (utmpf < 0) {
syslog(LOG_ERR, "%s: %m", _PATH_UTMP);
exit(1);
}
getkmem();
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "socket: %m");
exit(1);
}
if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
exit(1);
}
sin.sin_family = AF_INET;
sin.sin_port = sp->s_port;
if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
syslog(LOG_ERR, "bind: %m");
exit(1);
}
if (!configure(s))
exit(1);
signal(SIGALRM, onalrm);
onalrm();
for (;;) {
struct whod wd;
int cc, whod, len = sizeof (from);
cc = recvfrom(s, (char *)&wd, sizeof (struct whod), 0,
(struct sockaddr *)&from, &len);
if (cc <= 0) {
if (cc < 0 && errno != EINTR)
syslog(LOG_WARNING, "recv: %m");
continue;
}
if (from.sin_port != sp->s_port) {
syslog(LOG_WARNING, "%d: bad from port",
ntohs(from.sin_port));
continue;
}
if (wd.wd_vers != WHODVERSION)
continue;
if (wd.wd_type != WHODTYPE_STATUS)
continue;
if (!verify(wd.wd_hostname)) {
syslog(LOG_WARNING, "malformed host name from %x",
from.sin_addr);
continue;
}
(void) sprintf(path, "whod.%s", wd.wd_hostname);
/*
* Rather than truncating and growing the file each time,
* use ftruncate if size is less than previous size.
*/
whod = open(path, O_WRONLY | O_CREAT, 0644);
if (whod < 0) {
syslog(LOG_WARNING, "%s: %m", path);
continue;
}
#if ENDIAN != BIG_ENDIAN
{
int i, n = (cc - WHDRSIZE)/sizeof(struct whoent);
struct whoent *we;
/* undo header byte swapping before writing to file */
wd.wd_sendtime = ntohl(wd.wd_sendtime);
for (i = 0; i < 3; i++)
wd.wd_loadav[i] = ntohl(wd.wd_loadav[i]);
wd.wd_boottime = ntohl(wd.wd_boottime);
we = wd.wd_we;
for (i = 0; i < n; i++) {
we->we_idle = ntohl(we->we_idle);
we->we_utmp.out_time =
ntohl(we->we_utmp.out_time);
we++;
}
}
#endif
(void) time((time_t *)&wd.wd_recvtime);
(void) write(whod, (char *)&wd, cc);
if (fstat(whod, &st) < 0 || st.st_size > cc)
ftruncate(whod, cc);
(void) close(whod);
}
}
/*
* Check out host name for unprintables
* and other funnies before allowing a file
* to be created. Sorry, but blanks aren't allowed.
*/
verify(name)
register char *name;
{
register int size = 0;
while (*name) {
if (!isascii(*name) || !(isalnum(*name) || ispunct(*name)))
return (0);
name++, size++;
}
return (size > 0);
}
int utmptime;
int utmpent;
int utmpsize = 0;
struct utmp *utmp;
int alarmcount;
void
onalrm()
{
register struct neighbor *np;
register struct whoent *we = mywd.wd_we, *wlast;
register int i;
struct stat stb;
int cc;
double avenrun[3];
time_t now = time((time_t *)NULL);
char *strerror();
if (alarmcount % 10 == 0)
getkmem();
alarmcount++;
(void) fstat(utmpf, &stb);
if ((stb.st_mtime != utmptime) || (stb.st_size > utmpsize)) {
utmptime = stb.st_mtime;
if (stb.st_size > utmpsize) {
utmpsize = stb.st_size + 10 * sizeof(struct utmp);
if (utmp)
utmp = (struct utmp *)realloc(utmp, utmpsize);
else
utmp = (struct utmp *)malloc(utmpsize);
if (! utmp) {
fprintf(stderr, "rwhod: malloc failed\n");
utmpsize = 0;
goto done;
}
}
(void) lseek(utmpf, (long)0, L_SET);
cc = read(utmpf, (char *)utmp, stb.st_size);
if (cc < 0) {
fprintf(stderr, "rwhod: %s: %s\n",
_PATH_UTMP, strerror(errno));
goto done;
}
wlast = &mywd.wd_we[1024 / sizeof (struct whoent) - 1];
utmpent = cc / sizeof (struct utmp);
for (i = 0; i < utmpent; i++)
if (utmp[i].ut_name[0]) {
bcopy(utmp[i].ut_line, we->we_utmp.out_line,
sizeof (utmp[i].ut_line));
bcopy(utmp[i].ut_name, we->we_utmp.out_name,
sizeof (utmp[i].ut_name));
we->we_utmp.out_time = htonl(utmp[i].ut_time);
if (we >= wlast)
break;
we++;
}
utmpent = we - mywd.wd_we;
}
/*
* The test on utmpent looks silly---after all, if no one is
* logged on, why worry about efficiency?---but is useful on
* (e.g.) compute servers.
*/
if (utmpent && chdir(_PATH_DEV)) {
syslog(LOG_ERR, "chdir(%s): %m", _PATH_DEV);
exit(1);
}
we = mywd.wd_we;
for (i = 0; i < utmpent; i++) {
if (stat(we->we_utmp.out_line, &stb) >= 0)
we->we_idle = htonl(now - stb.st_atime);
we++;
}
(void) getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0]));
for (i = 0; i < 3; i++)
mywd.wd_loadav[i] = htonl((u_long)(avenrun[i] * 100));
cc = (char *)we - (char *)&mywd;
mywd.wd_sendtime = htonl(time(0));
mywd.wd_vers = WHODVERSION;
mywd.wd_type = WHODTYPE_STATUS;
for (np = neighbors; np != NULL; np = np->n_next)
(void) sendto(s, (char *)&mywd, cc, 0,
(struct sockaddr *)np->n_addr, np->n_addrlen);
if (utmpent && chdir(_PATH_RWHODIR)) {
syslog(LOG_ERR, "chdir(%s): %m", _PATH_RWHODIR);
exit(1);
}
done:
(void) alarm(AL_INTERVAL);
}
void
getkmem()
{
static ino_t vmunixino;
static time_t vmunixctime;
struct stat sb;
if (stat(_PATH_UNIX, &sb) < 0) {
if (vmunixctime)
return;
} else {
if (sb.st_ctime == vmunixctime && sb.st_ino == vmunixino)
return;
vmunixctime = sb.st_ctime;
vmunixino= sb.st_ino;
}
if (kmemf >= 0)
(void) close(kmemf);
loop:
if (nlist(_PATH_UNIX, nl)) {
syslog(LOG_WARNING, "%s: namelist botch", _PATH_UNIX);
sleep(300);
goto loop;
}
kmemf = open(_PATH_KMEM, O_RDONLY, 0);
if (kmemf < 0) {
syslog(LOG_ERR, "%s: %m", _PATH_KMEM);
exit(1);
}
(void) lseek(kmemf, (long)nl[NL_BOOTTIME].n_value, L_SET);
(void) read(kmemf, (char *)&mywd.wd_boottime,
sizeof (mywd.wd_boottime));
mywd.wd_boottime = htonl(mywd.wd_boottime);
}
/*
* Figure out device configuration and select
* networks which deserve status information.
*/
configure(s)
int s;
{
char buf[BUFSIZ], *cp, *cplim;
struct ifconf ifc;
struct ifreq ifreq, *ifr;
struct sockaddr_in *sin;
register struct neighbor *np;
ifc.ifc_len = sizeof (buf);
ifc.ifc_buf = buf;
if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) {
syslog(LOG_ERR, "ioctl (get interface configuration)");
return (0);
}
ifr = ifc.ifc_req;
#ifdef AF_LINK
#define max(a, b) (a > b ? a : b)
#define size(p) max((p).sa_len, sizeof(p))
#else
#define size(p) (sizeof (p))
#endif
cplim = buf + ifc.ifc_len; /*skip over if's with big ifr_addr's */
for (cp = buf; cp < cplim;
cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) {
ifr = (struct ifreq *)cp;
for (np = neighbors; np != NULL; np = np->n_next)
if (np->n_name &&
strcmp(ifr->ifr_name, np->n_name) == 0)
break;
if (np != NULL)
continue;
ifreq = *ifr;
np = (struct neighbor *)malloc(sizeof (*np));
if (np == NULL)
continue;
np->n_name = malloc(strlen(ifr->ifr_name) + 1);
if (np->n_name == NULL) {
free((char *)np);
continue;
}
strcpy(np->n_name, ifr->ifr_name);
np->n_addrlen = sizeof (ifr->ifr_addr);
np->n_addr = malloc(np->n_addrlen);
if (np->n_addr == NULL) {
free(np->n_name);
free((char *)np);
continue;
}
bcopy((char *)&ifr->ifr_addr, np->n_addr, np->n_addrlen);
if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get interface flags)");
free((char *)np);
continue;
}
if ((ifreq.ifr_flags & IFF_UP) == 0 ||
(ifreq.ifr_flags & (IFF_BROADCAST|IFF_POINTOPOINT)) == 0) {
free((char *)np);
continue;
}
np->n_flags = ifreq.ifr_flags;
if (np->n_flags & IFF_POINTOPOINT) {
if (ioctl(s, SIOCGIFDSTADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get dstaddr)");
free((char *)np);
continue;
}
/* we assume addresses are all the same size */
bcopy((char *)&ifreq.ifr_dstaddr,
np->n_addr, np->n_addrlen);
}
if (np->n_flags & IFF_BROADCAST) {
if (ioctl(s, SIOCGIFBRDADDR, (char *)&ifreq) < 0) {
syslog(LOG_ERR, "ioctl (get broadaddr)");
free((char *)np);
continue;
}
/* we assume addresses are all the same size */
bcopy((char *)&ifreq.ifr_broadaddr,
np->n_addr, np->n_addrlen);
}
/* gag, wish we could get rid of Internet dependencies */
sin = (struct sockaddr_in *)np->n_addr;
sin->sin_port = sp->s_port;
np->n_next = neighbors;
neighbors = np;
}
return (1);
}
#ifdef DEBUG
sendto(s, buf, cc, flags, to, tolen)
int s;
char *buf;
int cc, flags;
char *to;
int tolen;
{
register struct whod *w = (struct whod *)buf;
register struct whoent *we;
struct sockaddr_in *sin = (struct sockaddr_in *)to;
char *interval();
printf("sendto %x.%d\n", ntohl(sin->sin_addr), ntohs(sin->sin_port));
printf("hostname %s %s\n", w->wd_hostname,
interval(ntohl(w->wd_sendtime) - ntohl(w->wd_boottime), " up"));
printf("load %4.2f, %4.2f, %4.2f\n",
ntohl(w->wd_loadav[0]) / 100.0, ntohl(w->wd_loadav[1]) / 100.0,
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");
}
}
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) sprintf(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) sprintf(resbuf, "%s %2d+%02d:%02d",
updown, days, hours, minutes);
else
(void) sprintf(resbuf, "%s %2d:%02d",
updown, hours, minutes);
return (resbuf);
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.