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