/* * 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 #include #include #include #include #include #include #include /* Local stuff. */ #include "tcpd.h" /* Forward declarations. */ static void ptx_sink(); /* tli_host - determine TLI endpoint info, PTX version */ void tli_host(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(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 */