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/*
* The Dynix/PTX TLI implementation is not quite compatible with System V
* Release 4. Some important functions are not present so we are limited to
* IP-based services.
*
* Diagnostics are reported through syslog(3).
*
* Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
*/
#ifndef lint
static char sccsid[] = "@(#) ptx.c 1.3 94/12/28 17:42:38";
#endif
#ifdef PTX
/* System libraries. */
#include <sys/types.h>
#include <sys/tiuser.h>
#include <sys/socket.h>
#include <stropts.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <syslog.h>
/* Local stuff. */
#include "tcpd.h"
/* Forward declarations. */
static void ptx_sink();
/* tli_host - determine TLI endpoint info, PTX version */
void tli_host(request)
struct request_info *request;
{
static struct sockaddr_in client;
static struct sockaddr_in server;
/*
* getpeerinaddr() was suggested by someone at Sequent. It seems to work
* with connection-oriented (TCP) services such as rlogind and telnetd,
* but it returns 0.0.0.0 with datagram (UDP) services. No problem: UDP
* needs special treatment anyway, in case we must refuse service.
*/
if (getpeerinaddr(request->fd, &client, sizeof(client)) == 0
&& client.sin_addr.s_addr != 0) {
request->client->sin = &client;
if (getmyinaddr(request->fd, &server, sizeof(server)) == 0) {
request->server->sin = &server;
} else {
tcpd_warn("warning: getmyinaddr: %m");
}
sock_methods(request);
} else {
/*
* Another suggestion was to temporarily switch to the socket
* interface, identify the endpoint addresses with socket calls, then
* to switch back to TLI. This seems to works OK with UDP services,
* which is exactly what we should be looking at right now.
*/
#define SWAP_MODULE(f, old, new) (ioctl(f, I_POP, old), ioctl(f, I_PUSH, new))
if (SWAP_MODULE(request->fd, "timod", "sockmod") != 0)
tcpd_warn("replace timod by sockmod: %m");
sock_host(request);
if (SWAP_MODULE(request->fd, "sockmod", "timod") != 0)
tcpd_warn("replace sockmod by timod: %m");
if (request->sink != 0)
request->sink = ptx_sink;
}
}
/* ptx_sink - absorb unreceived IP datagram */
static void ptx_sink(fd)
int fd;
{
char buf[BUFSIZ];
struct sockaddr sa;
int size = sizeof(sa);
/*
* Eat up the not-yet received datagram. Where needed, switch to the
* socket programming interface.
*/
if (ioctl(fd, I_FIND, "timod") != 0)
ioctl(fd, I_POP, "timod");
if (ioctl(fd, I_FIND, "sockmod") == 0)
ioctl(fd, I_PUSH, "sockmod");
(void) recvfrom(fd, buf, sizeof(buf), 0, &sa, &size);
}
#endif /* PTX */
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