Date: Thu, 30 Oct 1997 12:48:33 -0800 (PST) From: sameer <sameer@c2.net> To: freebsd-hackers@freebsd.org Subject: Whee, PPP over TCP working Message-ID: <199710302048.MAA15533@gabber.c2.net>
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So I didn't see anything in the archives about how to get PPP
over TCP working, so I figured it out myself. =)
Here's how to do it.. hopefully someone can integrate this
into the docs, etc.
On the client, edit ppp.conf as follows:
ppptcp:
set device remotehost:1324
set dial ""
set ifaddr 10.1.1.1 10.1.1.2
On the server, edit ppp.conf as follows:
tcpserver:
set ifaddr 10.1.1.2 10.1.1.1
If you want to use PAP/CHAP, whatever, then you should add
appropriate configuration for PAP/CHAP.
On the server, you need to plug the ppp user-land program onto
a port. I wrote the following program to do that -- it has zero
error-checking, it probably leaks fd's left and right, and it could be
improved to do a login/password thing... there's a lot you can do to
improve it, but I didn't have the time, I just wanted to put together
a proof of concept.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main(void)
{
int s = socket(PF_INET, SOCK_STREAM, 0);
int a;
struct sockaddr_in addr;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(1324);
addr.sin_family = AF_INET;
bind(s, (struct sockaddr *) &addr, sizeof(addr));
listen(s, 15);
while(1)
{
struct sockaddr_in remote;
int size;
a = accept(s, (struct sockaddr *) &remote, &size);
/* Fork the subprocess to do proxying */
if(!fork()) {
char *message = "PPP/TCP Server Connected\n";
/* Spit out some stuff to the client to know we're connected */
write(a, message, strlen(message));
/* Dup some fd's and run ppp -direct */
dup2(a, STDOUT_FILENO);
dup2(a, STDIN_FILENO);
close(a);
execl("/usr/sbin/ppp", "ppp", "-direct", "tcpserver", NULL);
}
}
}
So then on the server, you just run
> ./ppp-tcp
Then on the client you can run
> ppp ppptcp
User Process PPP. Written by Toshiharu OHNO.
Log level is 09
can't open /etc/ppp/ppp.secret.
Warning: No password entry for this host in ppp.secret
Warning: All manipulation is allowed by anyone in the world
Using interface: tun0
Interactive mode
ppp ON gabber> dial
Dial attempt 1
dial OK!
login OK!
ppp ON gabber> Packet mode.
ppp ON gabber>
PPP ON gabber>
On the server you'll end up seeing:
{0} lachesis:sameer/ppp-tcp 12:46pm [14] > ./ppp-tcp
Log level is 281
can't open /etc/ppp/ppp.secret.
Warning: No password entry for this host in ppp.secret
Warning: All manipulation is allowed by anyone in the world
then you'll be all set. You can ping, etc.
--
Sameer Parekh Voice: 510-986-8770
President FAX: 510-986-8777
C2Net
http://www.c2.net/ sameer@c2.net
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