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
12 static 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
34 static void ptx_sink();
35
36 /* tli_host - determine TLI endpoint info, PTX version */
37
tli_host(struct request_info * request)38 void 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
ptx_sink(int fd)83 static 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