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3bconnect
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3bconnect
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Subject: v14i085: 3B2 Ethernet Connection and File Transfer Utility
Newsgroups: comp.sources.unix
Sender: sources
Approved: rsalz@uunet.UU.NET
Submitted-by: Dave Settle <mcvax!oscar.smb.co.uk!dave@uunet.uu.net>
Posting-number: Volume 14, Issue 85
Archive-name: 3bconnect
[ I don't have a 3B, so you're on your own. --r$ ]
This set is called 'connect', and is a utility for AT&T 3B2
3BNET (ethernet) networks, providing a remote login facility, and a
file transfer capability.
Dave.
-----------------------------------CUT HERE-----------------------------------
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create:
# README
# Makefile
# connect.1
# rcp.1
# server.c
# connect.c
# rcp.c
# eth.c
# ipaddr.c
# talk.c
# sub.c
# file.c
# terminate.c
# mynode.c
# ftp.c
# ni.h
# ftp.h
export PATH; PATH=/bin:/usr/bin:$PATH
echo shar: "extracting 'README'" '(4159 characters)'
if test -f 'README'
then
echo shar: "will not over-write existing file 'README'"
else
cat << \SHAR_EOF > 'README'
AT&T 3B2 Ethernet Connection and File Transfer Utility
This package allows you to login to other 3B2 computers connected via 3Bnet,
in a similar fashion to 'cu', and also to transfer files across the ethernet.
CONNECT
'Connect' provides a simple connection to a shell on the remote machine, linked
to your terminal via pipes. Initially, YOUR terminal will be doing the echoing
(in contrast to 'cu'), with lines shipped across the ethernet only when you
hit RETURN.
You can force the connection into 'raw' mode (each character shipped as typed,
remote end doing the echoing) by sending a QUIT signal. This allows you to
use screen editors on the remote machine.
A further QUIT signal gets you back into 'cooked' mode - this is indicated by
'[cooked]' appearing on your terminal. Unfortunately, this means that you
can't send QUIT signals to processes which you start on the remote host.
Sorry about this. Interrupts get processed OK, though.
You close the connection by typing ^D at your terminal (in cooked mode) -
if you want to send ^D to the remote end, you MUST be in 'raw' mode.
The big problem is that your remote shell has stdin, stdout, and stderr
connected to PIPES, rather than a real tty, which can cause certain commands
(e.g. stty) to fail.
PC-INTERFACE.
If you have PC-INTERFACE installed, then you can connect to one of the
pseudo-tty devices provided by the driver, by using the '-l' option of 'connect'
This gets you a remote shell connected to a 'real' tty device, and
automatically puts you in 'raw' mode.
You close this type of connection by sending a QUIT signal.
RCP
'rcp' provides a simple, but effective, method of transferring files across
the network. The syntax resembles 'uucp'.
WHAT YOU NEED TO DO TO INSTALL IT.
a) Find out the ethernet addresses of all machines on the network.
Use 'nitable', or the program 'mynode' provided.
b) Set up a map file '/usr/lib/ethernet.addr' which maps the names of
your hosts to the rightmost 2 digits of their ethernet address.
These should be unique - if not, change the value of LSB in 'ni.h'
to use any pair of digits which are unique for your network.
E.g.
oscar 80.00.10.30.18.f2
olive 80.00.10.30.0b.45
/usr/lib/ethernet.addr:
oscar f2
olive 45
c) Set up an inittab entry to run the server.
e.g. (assuming server is '/usr/lib/server')
et:2:respawn:/usr/lib/server
It's important that this line is properly defined!
DO NOT DEFINE ANY INPUT OR OUTPUT FILES FOR THIS PROCESS.
d) Make sure that you have enough 'port' structures allocated in the NI driver.
You can do this through the 'packagemgmt/3bnet/nidriver" option in 'sysadm'
I have 20 ports, 1 buffer per port, 1514 buffer size - this allows
me at least 5 concurrent 'connects' (I've not tried more)
You have to reboot for the reconfig to become effective.
e) Find out your value of NPROC, from the file /etc/master.d/KERNEL
Define this value in 'ni.h'
f) To connect, say 'connect <host>'
e.g.
connect olive
BUGS
TTY:
You're not connected to a tty at the remote end, so certain commands aren't
going to work. Screen editors will work, but only if you use them when you're
in 'raw' mode.
EOT:
There's no way to send EOT to a remote process. Typing ^D on your terminal will
close the connection. However, when you do a close, all your remote processes
get sent a hangup signal, which usually amounts to the same thing.
ETHERNET ADDRESS:
The ethernet addresses which are used by this package are NOT guaranteed to
be unique, and may interfere with other ethernet applications. (3Bnet and
PC-Interface seem to be OK, though).
If you get conflicts with other packages, you might have to change the values
in server[] and client[] in 'ni.h' ([1] and [2])
They are currently set to 0x02 0x02 - this is totally arbitrary,
so feel free to change it as you wish.
The rest of the bytes in server[] and client[] will be OK.
REMOTE SHELL TERMINATION:
If the remote shell dies, for any reason, you won't be informed until you
attempt to send it some input.
ADDING FEATURES.
If you put any fancy bits in, please let me know!
Good luck!
Dave Settle, dave@smb.co.uk
SHAR_EOF
if test 4159 -ne "`wc -c < 'README'`"
then
echo shar: "error transmitting 'README'" '(should have been 4159 characters)'
fi
fi
echo shar: "extracting 'Makefile'" '(1042 characters)'
if test -f 'Makefile'
then
echo shar: "will not over-write existing file 'Makefile'"
else
cat << \SHAR_EOF > 'Makefile'
#CFLAGS = -g
#LIBS = -lg
#
# If you wish a SECURE version (no super-user server processes),
# define SECURE. This will prevent root from using 'connect' or 'rcp'.
#
# CFLAGS = -O -DSECURE
SERVER = server.o eth.o ipaddr.o talk.o sub.o file.o ftp.o
CONNECT = connect.o eth.o terminate.o ipaddr.o
MYNODE = mynode.o ipaddr.o
RCP = rcp.o sub.o ipaddr.o eth.o ftp.o
DOCS = README Makefile connect.1 rcp.1
SOURCES = server.c connect.c rcp.c eth.c ipaddr.c talk.c \
sub.c file.c terminate.c mynode.c ftp.c ni.h ftp.h
all: server connect mynode rcp
lint:
lint ${SERVER:.o=.c}
lint ${CONNECT:.o=.c}
lint ${RCP:.o=.c}
${SERVER} ${CONNECT} ${RCP} : ni.h
rcp.o ftp.o file.o : ftp.h
server: ${SERVER}
cc -o server ${SERVER} ${LIBS}
connect: ${CONNECT}
cc -o connect ${CONNECT} ${LIBS}
rcp: ${RCP}
cc -o rcp ${RCP} ${LIBS}
mynode: ${MYNODE}
cc -o mynode ${MYNODE} ${LIBS}
shar:
shar -cv ${DOCS} ${SOURCES} > connect.shar
install:
if [ -f /usr/lib/server ] ; then \
mv /usr/lib/server /usr/lib/server.old ; fi
cp server /usr/lib
SHAR_EOF
if test 1042 -ne "`wc -c < 'Makefile'`"
then
echo shar: "error transmitting 'Makefile'" '(should have been 1042 characters)'
fi
fi
echo shar: "extracting 'connect.1'" '(3547 characters)'
if test -f 'connect.1'
then
echo shar: "will not over-write existing file 'connect.1'"
else
cat << \SHAR_EOF > 'connect.1'
.TH CONNECT 1 local
.SH NAME
connect
.SH SYNOPSIS
.B "connect [-l] remote_host"
.PP
.SH DESCRIPTION
.I connect
allows you to connect to a remote host connected via 3BNET, and to start a
remote shell on that machine. The shell started is the one specified by
your SHELL variable, or "/bin/sh" if this is not set.
.PP
Initially, all the echoing is done by the local machine, and input is
transmitted line by line (cooked mode). If you wish the remote machine to
do the echoing (e.g. you're running a screen editor there), you must put
your terminal in raw mode, by sending a QUIT signal.
.PP
In raw mode, each character is send as soon as it is typed, and no echoing
is performed by the local machine. A further QUIT signal will revert to
cooked mode again (i.e. QUIT can be used to toggle between raw and cooked modes)
.PP
The connection can be closed by typing EOT in cooked mode.
.PP
.SH "LOGIN OPTION"
.PP
If the \fB-l\fR option is specified, and if PC-INTERFACE is installed on the
remote host, then you will be connected to one of the pseudo-ttys supported
by driver.
.PP
This option gives you a remote connection which looks more like a direct
tty link, and automatically puts you in 'raw' mode.
.PP
On the other hand, you have to go through all the bother of logging on,
which takes more time.
.PP
Using the \fB-i\fR option \fBonly\fR, the connection is closed by a QUIT
signal.
.SH SECURITY
The remote server will only accept a request to start a shell if your login
name is known on the remote machine, and your remote uid matches your local uid.
.PP
The uid used to start the remote process is your \fBreal\fR uid, not your
effective uid, so that even if you're running su(1), your remote process
will not be root.
.PP
The only way you can login to a remote machine as root, is to login to your
local machine as root (on the console), and \fIconnect\fR from there.
.PP
When the remote process it started, it will have your uid, the gid assosciated
with the \fBremote\fR uid, and will be located in your remote home directory.
.SH "HOST MAPPING"
The mapping between host names and ethernet addresses is defined in the
file '/usr/lib/ethernet.addr'.
.PP
The format of the file is:
.PP
<hostname> <ID>
.PP
e.g.
.PP
olive 45
oscar f2
.PP
As shipped, the package expects each host to have a physical ethernet
address which is unique \fBin the last (lsb) byte\fR.
.PP
The addresses which are used are:
.PP
XX.YY.YY.00.00.HH Server
XX.YY.YY.PID.PID.HH Client/Remote Process.
.PP
The values of XX and YY are totally arbitrary, and you can change them if
you wish. The value of HH must be different for each host, and is taken from
the LSB of the host physical ethernet address. If this does not produce
a unique value for each server, then you can choose to take it from any other
byte of the physical address, by redefining LSB (ni.h) to pick any other byte.
.SH EXAMPLES
.PP
connect -l olive
.PP
Connect to a PC-INTERFACE pseudo-tty on host 'olive'.
.PP
connect oscar
.PP
Connect to a remote shell on host 'oscar'
.PP
.SH FILES
/dev/ni Ethernet interface.
.PP
/dev/ptty?? PC-INTERFACE pseudo-ttys
.PP
/usr/lib/ethernet.add List of hosts.
.PP
.SH SEE ALSO
.SH BUGS
You can't send QUIT signals to remote processes, 'cos QUIT does various things
to the connection.
.PP
The values of XX and YY may conflict with other applications.
.PP
There's no guarantee that you can get a unique host ID using only one byte
from the physical node address.
.PP
\fIconnect <host>\fR gets you a shell which isn't connected to a real tty
device.
SHAR_EOF
if test 3547 -ne "`wc -c < 'connect.1'`"
then
echo shar: "error transmitting 'connect.1'" '(should have been 3547 characters)'
fi
fi
echo shar: "extracting 'rcp.1'" '(2176 characters)'
if test -f 'rcp.1'
then
echo shar: "will not over-write existing file 'rcp.1'"
else
cat << \SHAR_EOF > 'rcp.1'
.TH RCP 1 local
.SH SYNOPSIS
.B "rcp [-d] source [source ...] dest"
.SH DESCRIPTION
\fIrcp\fR allows files to be transferred to or from remote machines,
using the ethernet connection between Olivetti 3B2's supporting 3BNET.
It does \fBNOT\fR use the \fInisend\fB network interface, which has
proved to be very unreliable, but uses the packet transport interface
directly.
.PP
Any of the file names specified may be prefixed with a \fBsystem name\fR,
meaning that the file should be transferred to or from the remote machine
specified. The system name is separated from the file name by either
a '!' or a ':' character.
.PP
Only one remote system may be specified for each \fIrcp\fR command,
and all the source files must live on the same system. It is not possible
to move files from one place to another on a remote machine - they
must transfer across the ethernet connection. This is a restriction
imposed by the protocol.
.SH FLAGS
.PP
.TP
.B -d
Turn debugging output on during the file transfer procedure. Useful only
if you know what the ftp protocol is supposed to be doing.
.PP
.SH EXAMPLES
.PP
rcp oscar!/usr/dave/file.c /usr/tmp
.PP
Copies the file \fB/usr/dave/file.c\fR from the system \fBoscar\fR to the
destination \fB/usr/tmp\fR on the local system.
.PP
rcp /usr/dave/src/rcp.c myprog olive:/usr/dave/public
.PP
Copies the local files \fB/usr/dave/src/rcp.c\fR and
\fBmyprog\fR, to the destination \fB/usr/dave/public\fR on the
system \fBolive\fR.
.SH "SEE ALSO"
uucp(1), cp(1), nisend(1)
.SH DIAGNOSTICS
Normal information about files which can't be read or written; this
information may come from either host.
.PP
In the event of a protocol failure, the remote server may terminate
\fIrcp\fR. There should be a diagnostic message - consult your guru.
.SH BUGS
You can't talk to more than one remote host at a time: things like
.PP
rcp a:file1 b:file2 c:dest
.PP
are \fBNOT\fR allowed.
.PP
You can't move things around on the remote host - you can only copy
from one host to another.
.PP
The file transfer protocol is a home-grown variety, and is not going
to be any sort of standard. It would be nice if it used TCP/IP, or
some other well-defined protocol.
SHAR_EOF
if test 2176 -ne "`wc -c < 'rcp.1'`"
then
echo shar: "error transmitting 'rcp.1'" '(should have been 2176 characters)'
fi
fi
echo shar: "extracting 'server.c'" '(6188 characters)'
if test -f 'server.c'
then
echo shar: "will not over-write existing file 'server.c'"
else
cat << \SHAR_EOF > 'server.c'
/*
* Copyright (C) 1988 Dave Settle. All rights reserved.
* Permission is granted to use, copy and modify this software, providing
* that it is not sold for profit, and that this copyright notice is retained
* in any copies of the source.
*/
/*
* server: ethernet server. Accepts requests, and spawns processes to
* serve remote clients.
*/
#include <sys/ni.h>
#include <stdio.h>
#include <sys/signal.h>
#include <sys/errno.h>
extern int errno;
#include <pwd.h>
struct passwd *getpwnam();
char *strrchr();
#define MAIN
#include "ni.h"
int input[2], output[2]; /* pipes for shell */
char cmd[128], program[32];
int reader, sh; /* pid of child reader process */
#define LOG "/usr/lib/server.log"
#define GIGABYTE 2*1024*1024 /* number of blocks in 1 GByte */
/*
* endproc: called when the shell has died (via SIGPIPE) by the writer process
*/
endproc(){
struct request req;
skill(reader, SIGTERM);
sprintf(req.r_data, "your shell died");
send(&req, strlen(req.r_data), TERMINATE, client);
exit(0);
}
/*
* Called when we get a TERMINATE packet from the client.
*/
sigterm(){
skill(reader, SIGTERM);
skill(sh, SIGHUP);
sleep(1);
skill(sh, SIGKILL);
exit(0);
}
main()
{
int in;
signal(SIGHUP, SIG_IGN);
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
signal(SIGTERM, sigterm);
ulimit(2, (long) GIGABYTE);
/*
* This process runs from "init" - it doesn't have ANY file descriptors open
* Check this, and if necessary, create some dummy fd's.
*/
if(in = open("/dev/null", 0) == 0) {
open("/dev/null", 1);
open("/dev/null", 1);
}
else close(in);
freopen(LOG, "a+", stderr);
if(configure(server, 2, 0) == -1) exit(1);
accept();
return(0);
}
accept(){
struct request request;
recv(&request);
/*
* Fork off child to deal with the request. We die, and are respawned by
* init.
*/
if(fork() == 0) exit(serve(&request));
/*
* parent - exit.
*/
return(0);
}
/*
* serve: set up a shell for the remote process, and pass data.
*/
#define RD 0
#define WT 1
serve(r)
register struct request *r;
{
int pid = getpid(), writer, n, uid, ok;
int oldnet;
char user[32];
struct passwd *pw;
char home[32], path[128], shell[16], mail[64], term[32], logname[64];
/*
* Get the user info from the request header, and set our parameters
*/
n = sscanf(r->r_data, "%d %s %s", &uid, user, term);
memcpy(client, r->r_port.srcaddr, ETHERSIZE);
pw = getpwnam(user);
if(pw == NULL) {
n = sprintf(r->r_data, "User '%s' not known here", user);
send(r, n, TERMINATE, client);
exit(0);
}
if(pw->pw_uid != uid) {
n = sprintf(r->r_data, "User '%s' and uid '%d' don't match",
user, uid);
send(r, n, TERMINATE, client);
exit(0);
}
#ifdef SECURE
if(uid == 0) {
n = sprintf(r->r_data, "Secure server: root access not allowed");
send(r, n, TERMINATE, client);
exit(0);
}
#endif
setpgrp(); /* Set up a process group */
setgid(pw->pw_gid);
setuid(pw->pw_uid);
sprintf(mail, "MAIL=/usr/mail/%s", user);
sprintf(path, "PATH=:/usr/ucb:/bin:/usr/bin");
sprintf(logname, "LOGNAME=%s", user);
sprintf(shell, "SHELL=%s", pw->pw_shell);
sprintf(home, "HOME=%s", pw->pw_dir);
putenv(home); putenv(path); putenv(shell);
putenv(mail); putenv(logname);
putenv(term);
chdir(pw->pw_dir);
if(debug) {
fprintf(stderr, "Server request from %s\n", getenv("LOGNAME"));
}
server[PIDMSB] = (pid >> 8) & 0xff;
server[PIDLSB] = pid & 0xff;
oldnet = ethernet; /* save old port for a bit */
if(configure(server, 3, getpid()) == -1) { /* We are this address */
ethernet = oldnet; /* Use old port */
sprintf(r->r_data, "Can't allocate port");
send(r, strlen(r->r_data), TERMINATE, client);
exit(1);
}
close(oldnet); /* OK - use the new port */
/*
* Inform the client of our new address
*/
memcpy(r->r_data, mynode, ETHERSIZE);
send(r, ETHERSIZE, ACCEPT, client);
/*
* Get the command which the client wishes us to execute
*/
recv(r);
memcpy(cmd, r->r_data, r->r_size);
/*
* Special cases:
* "login" - user wants a real login - use the PC-Interface pttys
* "fileserver" - user wants to transfer files.
*/
if(!strcmp(cmd, "login")) return(dologin(r));
if(!strcmp(cmd, "fileserver")) return(fileserver(r));
/*
* Now start off the child process, and collect it's output
*/
pipe(input);
pipe(output);
if(sh = fork()) {
close(input[WT]);
close(output[RD]);
writer = getpid();
if(reader = fork()) {
ok = 1;
signal(SIGPIPE, endproc);
while(ok) {
recv(r);
if(debug) {
fprintf(stderr, "server: got [%s] from %s\n",
r->r_data, ipaddr(r->r_port.srcaddr));
}
ok = passon(r, output[WT]);
}
sigterm();
}
else {
signal(SIGTERM, SIG_DFL);
while((n = read(input[RD], r->r_data, sizeof r->r_data)) != -1) {
send(r, n, DATA, client);
if(debug) {
fprintf(stderr, "server: %s sent to %s\n",
r->r_data, ipaddr(client));
}
}
sprintf(r->r_data, "hangup\n");
send(r, strlen(r->r_data), TERMINATE, client);
skill(writer, SIGKILL);
exit(0);
}
}
else doexec(r); /* exec the child shell */
}
/*
* doexec: perform exec of requested procedure
*/
doexec(r)
struct request *r;
{
char *argv[6];
split(cmd, argv);
close(0); close(1); close(2);
/*
* Duplicate READ side of output as stdin
*/
if(dup(output[RD]) != 0) perror("dup(input) != 0");
/*
* Duplicate WRITE side of input as stdout & stderr
*/
if(dup(input[WT]) != 1) perror("dup(output) != 1");
if(dup(input[WT]) != 2) perror("dup(output) != 2");
/*
* close all the parent's pipes - they're duplicated
*/
close(input[0]); close(input[1]);
close(output[0]); close(output[1]);
close(ethernet);
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
execvp(program, argv);
sprintf(r->r_data, "Cannot exec %s\n", cmd);
send(r, strlen(r->r_data), DATA, client);
exit(1);
}
split(p, argv)
register char *p;
char **argv;
{
int n = 1;
char *f;
static char name[16];
argv[0] = p;
while(*p) {
if(*p == ' ') {
*p++ = '\0';
while(*p == ' ') p++;
argv[n++] = p;
}
else p++;
}
strcpy(program, argv[0]);
if(f = strrchr(argv[0], '/')) f++;
else f = argv[0];
sprintf(name, "-%s", f);
argv[0] = name;
argv[n++] = NULL;
}
SHAR_EOF
if test 6188 -ne "`wc -c < 'server.c'`"
then
echo shar: "error transmitting 'server.c'" '(should have been 6188 characters)'
fi
fi
echo shar: "extracting 'connect.c'" '(6204 characters)'
if test -f 'connect.c'
then
echo shar: "will not over-write existing file 'connect.c'"
else
cat << \SHAR_EOF > 'connect.c'
/*
* Copyright (C) 1988 Dave Settle. All rights reserved.
* Permission is granted to use, copy and modify this software, providing
* that it is not sold for profit, and that this copyright notice is retained
* in any copies of the source.
*/
/*
* connect.c: connect tty to remote host.
*/
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/errno.h>
#include <sys/utsname.h>
#include <termio.h>
#include <pwd.h>
struct passwd *getpwuid(), *getpwnam();
char *getlogin();
int (*signal())();
extern int errno;
#include <stdio.h>
#define MAIN
#include "ni.h"
char remoteshell[] = {0,0,0,0,0,0};
struct request request;
int reader, writer; /* Processes */
int login = 0; /* Are we doing a login? */
#define COOKED 0
#define RAW 1
struct termio raw, cooked; /* To allow screen mode changes */
int screenmode = COOKED, toggle(), trap();
wakeup(){
signal(SIGALRM, wakeup);
}
/*
* Got a signal - die. Writer is child process here.
*/
die(sig){
if(sig) printf("Connection closed.\r\n");
if((getpid() == writer) && reader) kill(reader, SIGTERM);
else if(writer) terminate(writer);
send(&request, 0, TERMINATE, server);
if(cooked.c_oflag) ioctl(fileno(stdout), TCSETA, &cooked);
exit(0);
}
sendsig(sig)
{
struct request request;
signal(sig, sendsig);
if(sig == SIGINT) send(&request, 0, RMTSIGINT, server);
if(sig == SIGQUIT) send(&request, 0, RMTSIGQUIT, server);
}
main(argc, argv)
char **argv;
{
struct utsname uts;
register char *sys = argv[argc - 1];
int i;
if(argc < 2) {
printf("usage: %s hostname\n", argv[0]);
exit(1);
}
uname(&uts);
for(i=1;i<argc;i++) if(*argv[i] == '-') switch(argv[i][1]) {
case 'l':
login = 1;
break;
case 'd':
debug = 1;
break;
}
signal(SIGALRM, wakeup);
signal(SIGTERM, SIG_IGN);
if(configure(client, 3, getpid()) == -1) exit(1);
if((i = hostaddr(argv[argc - 1])) == -1) {
printf("Host '%s' not known\n", argv[argc - 1]);
exit(1);
}
else server[NODE] = i;
connect(server, sys);
return(0);
}
/*
* connect(addr): set up connection to ethernet address 'addr' (system 'sys')
*/
connect(addr, sys)
char *addr, *sys;
{
register struct request *r = &request;
char *shell, *user;
int n;
struct passwd *pw;
/*
* send off our login name and uid to remote host.
* also send timezone.
*/
if((user = getlogin()) == NULL)
pw = getpwuid(getuid());
else
pw = getpwnam(user);
if(pw == NULL) {
printf("Can't determine your user name!\n");
exit(1);
}
if(*pw->pw_name == 0) {
printf("Your user name is NULL! You seem to be %s\n",
user ? user : "unknown");
exit(1);
}
printf("Trying to connect to %s ... ", ipaddr(addr));
fflush(stdout);
sprintf(r->r_data, "%d %s TERM=%s",
pw->pw_uid, pw->pw_name, getenv("TERM"));
n = strlen(r->r_data);
send(r, n, REQUEST, addr);
recv(r);
if(r->r_type == TERMINATE) {
printf("rejected!\n%s: %s\n", sys, r->r_data);
exit(0);
}
memcpy(server, r->r_port.srcaddr, ETHERSIZE);
/*
* trap signals from here on, so that we can terminate the remote side.
*/
signal(SIGQUIT, toggle);
signal(SIGINT, sendsig);
signal(SIGHUP, die);
printf("OK\nStarting remote %s ... ", login ? "login" : "shell");
fflush(stdout);
if(login) n = sprintf(r->r_data, "login");
else {
shell = getenv("SHELL");
if(shell == 0) shell = "/bin/sh";
n = sprintf(r->r_data, "%s -i", shell);
}
send(r, n, REQUEST, server);
recv(r);
if(r->r_type == TERMINATE) {
printf("rejected!\n%s: %s\n", sys, r->r_data);
exit(0);
}
printf("OK\nConnection complete ... server is %s\n", ipaddr(server));
/*
* Set up the termio structures needed for mode swapping
*/
ioctl(fileno(stdin), TCGETA, &cooked);
ioctl(fileno(stdin), TCGETA, &raw);
raw.c_oflag &= ~OPOST;
raw.c_cc[VMIN] = 1;
raw.c_cc[VTIME] = 0;
raw.c_iflag = 0;
raw.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL);
screenmode = COOKED;
/*
* fork for reader and writer processes.
*/
reader = getpid();
if(writer = fork()) {
/*
* If we are starting a remote login via a ptty, then the remote host will
* echo, so set to raw mode. SIGQUIT will close the connection.
*/
if(login) {
screenmode = RAW;
ioctl(fileno(stdin), TCSETA, &raw);
signal(SIGQUIT, die);
signal(SIGINT, trap);
}
else {
/*
* Send the remote shell an initial newline, so that the user sees a prompt.
*/
r->r_data[0] = '\n';
send(r, 1, DATA, server);
}
while(n = read(fileno(stdin), r->r_data, sizeof r->r_data)) {
if(n == -1) {
if(errno == EINTR) continue;
else break;
}
if(debug) {
printf("client: sent [");
write(fileno(stdout), r->r_data, n);
printf("] to %s\n", ipaddr(server));
}
send(r, n, DATA, server);
}
send(r, 0, TERMINATE, server);
terminate(writer);
ioctl(fileno(stdout), TCSETA, &cooked);
exit(0);
}
else {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
while(1) {
recv(r);
if(debug) {
printf("client: got [");
write(fileno(stdout), r->r_data, r->r_size);
printf("] from %s\n", ipaddr(r->r_port.srcaddr));
}
if(r->r_type == TERMINATE) {
printf("Lost remote connection [");
fflush(stdout);
write(fileno(stdout), r->r_data, r->r_size);
printf("]\n");
kill(reader, SIGTERM);
ioctl(fileno(stdout), TCSETA, &cooked);
exit(0);
}
write(fileno(stdout), r->r_data, r->r_size);
}
}
}
/*
* toggle: change screen mode from RAW <-> COOKED
*/
toggle(sig){
static int (*handler)();
signal(sig, toggle);
switch(screenmode) {
case COOKED:
handler = signal(SIGINT, trap);
ioctl(fileno(stdin), TCSETA, &raw);
putchar(07); /* beep */
fflush(stdout);
screenmode = RAW;
break;
case RAW:
if(handler) signal(SIGINT, handler);
ioctl(fileno(stdin), TCSETA, &cooked);
printf("[cooked]");
fflush(stdout);
screenmode = COOKED;
break;
}
}
/*
* trap interrupts in raw mode, substitute 'del' char
* We can't just ignore interrupts, otherwise we can't switch out of raw mode.
*/
trap(sig){
struct request r;
signal(sig, trap);
switch(sig) {
default:
case SIGINT:
r.r_data[0] = cooked.c_cc[VINTR];
break;
case SIGQUIT:
r.r_data[0] = cooked.c_cc[VQUIT];
break;
}
send(&r, 1, DATA, server);
}
SHAR_EOF
if test 6204 -ne "`wc -c < 'connect.c'`"
then
echo shar: "error transmitting 'connect.c'" '(should have been 6204 characters)'
fi
fi
echo shar: "extracting 'rcp.c'" '(5486 characters)'
if test -f 'rcp.c'
then
echo shar: "will not over-write existing file 'rcp.c'"
else
cat << \SHAR_EOF > 'rcp.c'
/*
* rcp.c: NOT the Berkeley version.
*
* rcp [system!]source ... [system!]dest
* e.g. rcp a!file1 b!file2 c!/usr/tmp
*
* AUTHOR: Dave Settle, THORN EMI SMB Business Software, June 86
*
* Electronic address:
* dave%smb@ukc
* dave@smb.co.uk
*
*/
#include <stdio.h>