tomlin@dspo.UUCP (11/27/84)
The following two servers are handy, at least, if you are running the
MIT PC/IP code on IBM PCs and have a 4.2bsd machine on a connected
network.
I don't have a real time clock card and hate typing in the date and
time every time I boot the PC. Also, I hate typing internet addresses
everytime I want to telnet to a machine or tftp a file.
-- Bob Tomlinson (dspo!tomlin@LANL)
To install:
Add the following two lines to your /etc/services file:
time 37/udp timserver # PC/IP needed a UDP time server
name 42/udp nameserver # PC/IP needed a UDP name server
Add the following to your /etc/rc.local file (NOTE: we put local
things in /usr/local/bin):
if [ -f /usr/local/bin/timed ]; then
/usr/local/bin/timed & echo -n ' timed' >/dev/console
fi
if [ -f /usr/local/bin/named ]; then
/usr/local/bin/named & echo -n ' named' >/dev/console
fi
------------------ time server
/*
* Copyright, 1984 The Regents of the University of California. This software
* was produced under a U.S. Government contract, W-7405-ENG-36, by the
* Los Alamos National Laboratory, which is operated by the University of
* California for the U.S. Department of Energy. The U.S. Government is
* licensed to use, reproduce, and distribute this software. Permission
* is granted to the public to copy and use this software without charge,
* provided that this notice and any statement of authorship are reproduced
* on all copies. Neither the Government nor the University makes any warranty
* expressed or implied, or assumes any liability or responsibility for
* the use of this software.
*
* Written by Bob Tomlinson, Los Alamos National Laboratory, E-10/Data Systems
*
* $Header: timed.c,v 1.1 84/11/21 09:58:27 tomlin Exp $
*
* $State: Exp $
*
* $Log: timed.c,v $
* Revision 1.1 84/11/21 09:58:27 tomlin
* Initial revision
*
*/
#ifndef lint
static char rcsid[] = "$Header: timed.c,v 1.1 84/11/21 09:58:27 tomlin Exp $";
#endif lint
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
struct sockaddr_in sin = { AF_INET };
extern errno;
char myname[32];
struct servent *sp;
int s = -1;
main()
{
struct sockaddr_in from;
struct hostent *hp;
sp = getservbyname("time", "udp");
if (sp == 0) {
fprintf(stderr, "timed: udp/time: unknown service\n");
exit(1);
}
#ifndef DEBUG
if (fork())
exit(0);
{ int s;
for (s = 0; s < 10; s++)
(void) close(s);
(void) open("/", 0);
(void) dup2(0, 1);
(void) dup2(0, 2);
s = open("/dev/tty", 2);
if (s >= 0) {
ioctl(s, TIOCNOTTY, 0);
(void) close(s);
}
}
#endif
if (getuid()) {
fprintf(stderr, "timed: not super user\n");
exit(1);
}
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("timed: socket");
exit(1);
}
/*
* Establish host name as returned by system.
*/
if (gethostname(myname, sizeof (myname) - 1) < 0) {
perror("gethostname");
exit(1);
}
hp = gethostbyname(myname);
if (hp == NULL) {
fprintf(stderr, "%s: don't know my own name\n", myname);
exit(1);
}
sin.sin_family = hp->h_addrtype;
sin.sin_port = sp->s_port;
if (bind(s, &sin, sizeof (sin)) < 0) {
perror("timed: bind");
exit(1);
}
for (;;) {
char foo[10];
int cc, len = sizeof (from);
struct timeval tp;
struct timezone tzp;
unsigned long atime;
cc = recvfrom(s, (char *)foo, sizeof (foo), 0,
&from, &len);
if (cc < 0 && errno != EINTR) {
perror("timed: recv");
continue;
}
if (from.sin_port != sp->s_port) {
fprintf(stderr, "timed: %d: bad from port, continuing...\n",
ntohs(from.sin_port));
/* continue; */
}
gettimeofday(&tp, &tzp);
#define SECS_PER_DAY (24*60*60)
/* 70 years between ARPA base and UNIX base 1900-1969 */
/* 365 days per year */
/* 17 leap years (extra days) */
atime = tp.tv_sec + ((70*365+17) * SECS_PER_DAY);
#if vax || pdp11
atime = htonl(atime);
#endif
(void) sendto(s, (char *)&atime, sizeof (atime), 0,
&from, len);
}
}
------------------ name server
/*
* Copyright, 1984 The Regents of the University of California. This software
* was produced under a U.S. Government contract, W-7405-ENG-36, by the
* Los Alamos National Laboratory, which is operated by the University of
* California for the U.S. Department of Energy. The U.S. Government is
* licensed to use, reproduce, and distribute this software. Permission
* is granted to the public to copy and use this software without charge,
* provided that this notice and any statement of authorship are reproduced
* on all copies. Neither the Government nor the University makes any warranty
* expressed or implied, or assumes any liability or responsibility for
* the use of this software.
*
* $Header: named.c,v 1.1 84/11/21 17:29:59 tomlin Exp $
*
* $State: Exp $
*
* $Log: named.c,v $
* Revision 1.1 84/11/21 17:29:59 tomlin
* Initial revision
*
*/
#ifndef lint
static char rcsid[] = "$Header: named.c,v 1.1 84/11/21 17:29:59 root Exp $";
#endif lint
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <netdb.h>
#include <strings.h>
struct sockaddr_in sin = { AF_INET };
typedef struct namerequest {
char nr_nameoctet;
char nr_namelen;
char nr_namestr[1024]; /* 1024 is arbitrary */
};
unsigned char *replybuf;
unsigned char *malloc();
#define ERRORMESSAGE "Unknown machine"
extern errno;
char myname[32];
struct servent *sp;
int s = -1;
main()
{
struct sockaddr_in from;
struct hostent *hp;
sp = getservbyname("name", "udp");
if (sp == 0) {
fprintf(stderr, "named: udp/name: unknown service\n");
exit(1);
}
#ifndef DEBUG
if (fork())
exit(0);
{ int s;
for (s = 0; s < 10; s++)
(void) close(s);
(void) open("/", 0);
(void) dup2(0, 1);
(void) dup2(0, 2);
s = open("/dev/tty", 2);
if (s >= 0) {
ioctl(s, TIOCNOTTY, 0);
(void) close(s);
}
}
#endif
if (getuid()) {
fprintf(stderr, "named: not super user\n");
exit(1);
}
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("named: socket");
exit(1);
}
/*
* Establish host name as returned by system.
*/
if (gethostname(myname, sizeof (myname) - 1) < 0) {
perror("gethostname");
exit(1);
}
hp = gethostbyname(myname);
if (hp == NULL) {
fprintf(stderr, "%s: don't know my own name\n", myname);
exit(1);
}
sin.sin_family = hp->h_addrtype;
sin.sin_port = sp->s_port;
if (bind(s, &sin, sizeof (sin)) < 0) {
perror("named: bind");
exit(1);
}
for (;;) {
int cc, i, len = sizeof (from);
struct namerequest request;
struct hostent *rh;
cc = recvfrom(s, (char *)&request, sizeof (request), 0,
&from, &len);
if (cc <= 0) {
if (cc < 0 && errno != EINTR)
perror("named: recv");
continue;
}
if (from.sin_port != sp->s_port) {
fprintf(stderr, "named: %d: bad from port, continuing...\n",
ntohs(from.sin_port));
/* continue; */
}
request.nr_namestr[request.nr_namelen] = '\0';
rh = gethostbyname(request.nr_namestr);
if (rh == NULL) {
fprintf(stderr, "%s: unknown machine\n", request.nr_namestr);
/* 3 = error type + length + error code */
replybuf=malloc(cc+3+sizeof (ERRORMESSAGE));
bcopy(&request, replybuf, cc);
i=cc;
replybuf[i++]=(unsigned char)3; /* 3 denotes an error */
replybuf[i++]=(unsigned char)strlen(ERRORMESSAGE);
bcopy(ERRORMESSAGE, &replybuf[i], strlen(ERRORMESSAGE));
i+=strlen(ERRORMESSAGE);
(void) sendto(s, (char *)replybuf, i, 0, &from, len);
free(replybuf);
continue;
}
/* 6 = addr type + len + internet addr */
replybuf=malloc(cc+6);
bcopy(&request, replybuf, cc);
i=cc;
replybuf[i++]=(unsigned char)2; /* 2 denotes an addr */
replybuf[i++]=(unsigned char)rh->h_length;
bcopy(rh->h_addr, &replybuf[i], rh->h_length);
i+=(rh->h_length);
(void) sendto(s, (char *)replybuf, i, 0, &from, len);
free(replybuf);
}
}
--
Bob Tomlinson - dspo!tomlin@LANL or ucbvax!unmvax!lanl!dspo!tomlin
Los Alamos National Laboratory - E-10/Data Systems
Los Alamos, New Mexico - (505) 667-8495