1 /*
2  * The Dynix/PTX TLI implementation is not quite compatible with System V
3  * Release 4. Some important functions are not present so we are limited to
4  * IP-based services.
5  *
6  * Diagnostics are reported through syslog(3).
7  *
8  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
9  */
10
11#ifndef lint
12static char sccsid[] = "@(#) ptx.c 1.3 94/12/28 17:42:38";
13#endif
14
15#ifdef PTX
16
17/* System libraries. */
18
19#include <sys/types.h>
20#include <sys/tiuser.h>
21#include <sys/socket.h>
22#include <stropts.h>
23#include <netinet/in.h>
24#include <netdb.h>
25#include <stdio.h>
26#include <syslog.h>
27
28/* Local stuff. */
29
30#include "tcpd.h"
31
32/* Forward declarations. */
33
34static void ptx_sink();
35
36/* tli_host - determine TLI endpoint info, PTX version */
37
38void    tli_host(struct request_info *request)
39{
40    static struct sockaddr_in client;
41    static struct sockaddr_in server;
42
43    /*
44     * getpeerinaddr() was suggested by someone at Sequent. It seems to work
45     * with connection-oriented (TCP) services such as rlogind and telnetd,
46     * but it returns 0.0.0.0 with datagram (UDP) services. No problem: UDP
47     * needs special treatment anyway, in case we must refuse service.
48     */
49
50    if (getpeerinaddr(request->fd, &client, sizeof(client)) == 0
51	&& client.sin_addr.s_addr != 0) {
52	request->client->sin = &client;
53	if (getmyinaddr(request->fd, &server, sizeof(server)) == 0) {
54	    request->server->sin = &server;
55	} else {
56	    tcpd_warn("warning: getmyinaddr: %m");
57	}
58	sock_methods(request);
59
60    } else {
61
62	/*
63	 * Another suggestion was to temporarily switch to the socket
64	 * interface, identify the endpoint addresses with socket calls, then
65	 * to switch back to TLI. This seems to works OK with UDP services,
66	 * which is exactly what we should be looking at right now.
67	 */
68
69#define SWAP_MODULE(f, old, new) (ioctl(f, I_POP, old), ioctl(f, I_PUSH, new))
70
71	if (SWAP_MODULE(request->fd, "timod", "sockmod") != 0)
72	    tcpd_warn("replace timod by sockmod: %m");
73	sock_host(request);
74	if (SWAP_MODULE(request->fd, "sockmod", "timod") != 0)
75	    tcpd_warn("replace sockmod by timod: %m");
76	if (request->sink != 0)
77	    request->sink = ptx_sink;
78    }
79}
80
81/* ptx_sink - absorb unreceived IP datagram */
82
83static void ptx_sink(int fd)
84{
85    char    buf[BUFSIZ];
86    struct sockaddr sa;
87    int     size = sizeof(sa);
88
89    /*
90     * Eat up the not-yet received datagram. Where needed, switch to the
91     * socket programming interface.
92     */
93
94    if (ioctl(fd, I_FIND, "timod") != 0)
95	ioctl(fd, I_POP, "timod");
96    if (ioctl(fd, I_FIND, "sockmod") == 0)
97	ioctl(fd, I_PUSH, "sockmod");
98    (void) recvfrom(fd, buf, sizeof(buf), 0, &sa, &size);
99}
100
101#endif /* PTX */
102