2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part. Users
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11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 * Sun RPC is provided with no support and without any obligation on the
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15 * modification or enhancement.
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
25 * Sun Microsystems, Inc.
27 * Mountain View, California 94043
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char *rcsid = "$OpenBSD: svc_tcp.c,v 1.18 1998/05/22 04:23:01 deraadt Exp $";
32 #endif /* LIBC_SCCS and not lint */
35 * svc_tcp.c, Server side for TCP/IP based RPC.
37 * Copyright (C) 1984, Sun Microsystems, Inc.
39 * Actually implements two flavors of transporter -
40 * a tcp rendezvouser (a listner and connection establisher)
41 * and a record/tcp stream.
49 #include <sys/param.h>
50 #include <sys/socket.h>
53 #include <netinet/in_systm.h>
54 #include <netinet/in.h>
55 #include <netinet/ip.h>
57 #include <netinet/ip_var.h>
61 * Ops vector for TCP/IP based rpc service handle
63 static bool_t svctcp_recv();
64 static enum xprt_stat svctcp_stat();
65 static bool_t svctcp_getargs();
66 static bool_t svctcp_reply();
67 static bool_t svctcp_freeargs();
68 static void svctcp_destroy();
70 static struct xp_ops svctcp_op = {
80 * Ops vector for TCP/IP rendezvous handler
82 static bool_t rendezvous_request();
83 static enum xprt_stat rendezvous_stat();
85 static struct xp_ops svctcp_rendezvous_op = {
94 static int readtcp(), writetcp();
95 static SVCXPRT *makefd_xprt();
97 struct tcp_rendezvous { /* kept in xprt->xp_p1 */
102 struct tcp_conn { /* kept in xprt->xp_p1 */
103 enum xprt_stat strm_stat;
106 char verf_body[MAX_AUTH_BYTES];
111 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
113 * Creates, registers, and returns a (rpc) tcp based transporter.
114 * Once *xprt is initialized, it is registered as a transporter
115 * see (svc.h, xprt_register). This routine returns
116 * a NULL if a problem occurred.
118 * If sock<0 then a socket is created, else sock is used.
119 * If the socket, sock is not bound to a port then svctcp_create
120 * binds it to an arbitrary port. The routine then starts a tcp
121 * listener on the socket's associated port. In any (successful) case,
122 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
123 * associated port number.
125 * Since tcp streams do buffered io similar to stdio, the caller can specify
126 * how big the send and receive buffers are via the second and third parms;
127 * 0 => use the system default.
130 svctcp_create(sock, sendsize, recvsize)
135 bool_t madesock = FALSE;
136 register SVCXPRT *xprt;
137 register struct tcp_rendezvous *r;
138 struct sockaddr_in addr;
139 int len = sizeof(struct sockaddr_in);
141 if (sock == RPC_ANYSOCK) {
142 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
143 perror("svctcp_.c - udp socket creation problem");
144 return ((SVCXPRT *)NULL);
148 memset(&addr, 0, sizeof (addr));
150 addr.sin_len = sizeof(struct sockaddr_in);
152 addr.sin_family = AF_INET;
153 if (bindresvport(sock, &addr)) {
155 (void)bind(sock, (struct sockaddr *)&addr, len);
157 if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
158 (listen(sock, 2) != 0)) {
159 perror("svctcp_.c - cannot getsockname or listen");
162 return ((SVCXPRT *)NULL);
164 r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
166 (void)fprintf(stderr, "svctcp_create: out of memory\n");
171 r->sendsize = sendsize;
172 r->recvsize = recvsize;
173 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
175 (void)fprintf(stderr, "svctcp_create: out of memory\n");
182 xprt->xp_p1 = (caddr_t)r;
183 xprt->xp_auth = NULL;
184 xprt->xp_verf = _null_auth;
185 xprt->xp_ops = &svctcp_rendezvous_op;
186 xprt->xp_port = ntohs(addr.sin_port);
187 xprt->xp_sock = sock;
193 * Like svtcp_create(), except the routine takes any *open* UNIX file
194 * descriptor as its first input.
197 svcfd_create(fd, sendsize, recvsize)
203 return (makefd_xprt(fd, sendsize, recvsize));
207 makefd_xprt(fd, sendsize, recvsize)
212 register SVCXPRT *xprt;
213 register struct tcp_conn *cd;
215 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
216 if (xprt == (SVCXPRT *)NULL) {
217 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
220 cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
221 if (cd == (struct tcp_conn *)NULL) {
222 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
223 mem_free((char *) xprt, sizeof(SVCXPRT));
224 xprt = (SVCXPRT *)NULL;
227 cd->strm_stat = XPRT_IDLE;
228 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
229 (caddr_t)xprt, readtcp, writetcp);
231 xprt->xp_p1 = (caddr_t)cd;
232 xprt->xp_auth = NULL;
233 xprt->xp_verf.oa_base = cd->verf_body;
234 xprt->xp_addrlen = 0;
235 xprt->xp_ops = &svctcp_op; /* truely deals with calls */
236 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
244 rendezvous_request(xprt)
245 register SVCXPRT *xprt;
248 struct tcp_rendezvous *r;
249 struct sockaddr_in addr;
252 r = (struct tcp_rendezvous *)xprt->xp_p1;
254 len = sizeof(struct sockaddr_in);
255 if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
265 #define ipopt_list ip_opts
268 struct ipoption opts;
270 int optsize = sizeof(opts), i;
272 if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts,
273 &optsize) && optsize != 0) {
274 for (i = 0; (char *)&opts.ipopt_list[i] - (char *)&opts <
276 u_char c = (u_char)opts.ipopt_list[i];
277 if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
283 i += (c == IPOPT_NOP) ? 1 :
284 (u_char)opts.ipopt_list[i+1];
291 * XXX careful for ftp bounce attacks. If discovered, close the
292 * socket and look for another connection.
294 if (addr.sin_port == htons(20)) {
300 * make a new transporter (re-uses xprt)
302 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
303 xprt->xp_raddr = addr;
304 xprt->xp_addrlen = len;
305 return (FALSE); /* there is never an rpc msg to be processed */
308 static enum xprt_stat
317 register SVCXPRT *xprt;
319 register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
321 xprt_unregister(xprt);
322 if (xprt->xp_sock != -1)
323 (void)close(xprt->xp_sock);
325 if (xprt->xp_port != 0) {
326 /* a rendezvouser socket */
329 /* an actual connection socket */
330 XDR_DESTROY(&(cd->xdrs));
332 if (xprt->xp_auth != NULL) {
333 SVCAUTH_DESTROY(xprt->xp_auth);
334 xprt->xp_auth = NULL;
336 mem_free((caddr_t)cd, sizeof(struct tcp_conn));
337 mem_free((caddr_t)xprt, sizeof(SVCXPRT));
341 * All read operations timeout after 35 seconds.
342 * A timeout is fatal for the connection.
344 static struct timeval wait_per_try = { 35, 0 };
347 * reads data from the tcp conection.
348 * any error is fatal and the connection is closed.
349 * (And a read of zero bytes is a half closed stream => error.)
352 readtcp(xprt, buf, len)
353 register SVCXPRT *xprt;
357 register int sock = xprt->xp_sock;
358 struct timeval start, delta;
359 struct timeval tmp1, tmp2;
361 int prevbytes = 0, bytes;
362 extern int __svc_fdsetsize;
363 extern fd_set *__svc_fdset;
365 delta = wait_per_try;
366 gettimeofday(&start, NULL);
368 bytes = howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask);
369 if (bytes != prevbytes) {
372 fds = (fd_set *)malloc(bytes);
377 memcpy(fds, __svc_fdset, bytes);
380 switch (select(svc_maxfd+1, fds, NULL, NULL, &delta)) {
384 gettimeofday(&tmp1, NULL);
385 timersub(&tmp1, &start, &tmp2);
386 timersub(&wait_per_try, &tmp2, &tmp1);
387 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
394 if (!FD_ISSET(sock, fds)) {
395 svc_getreqset2(fds, svc_maxfd+1);
396 gettimeofday(&tmp1, NULL);
397 timersub(&tmp1, &start, &tmp2);
398 timersub(&wait_per_try, &tmp2, &tmp1);
399 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
405 } while (!FD_ISSET(sock, fds));
406 if ((len = read(sock, buf, len)) > 0) {
412 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
419 * writes data to the tcp connection.
420 * Any error is fatal and the connection is closed.
423 writetcp(xprt, buf, len)
424 register SVCXPRT *xprt;
430 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
431 if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
432 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
440 static enum xprt_stat
444 register struct tcp_conn *cd =
445 (struct tcp_conn *)(xprt->xp_p1);
447 if (cd->strm_stat == XPRT_DIED)
449 if (! xdrrec_eof(&(cd->xdrs)))
450 return (XPRT_MOREREQS);
455 svctcp_recv(xprt, msg)
457 register struct rpc_msg *msg;
459 register struct tcp_conn *cd =
460 (struct tcp_conn *)(xprt->xp_p1);
461 register XDR *xdrs = &(cd->xdrs);
463 xdrs->x_op = XDR_DECODE;
464 (void)xdrrec_skiprecord(xdrs);
465 if (xdr_callmsg(xdrs, msg)) {
466 cd->x_id = msg->rm_xid;
469 cd->strm_stat = XPRT_DIED; /* XXX */
474 svctcp_getargs(xprt, xdr_args, args_ptr)
479 return (SVCAUTH_UNWRAP(xprt->xp_auth,
480 &(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
481 xdr_args, args_ptr));
485 svctcp_freeargs(xprt, xdr_args, args_ptr)
491 &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
493 xdrs->x_op = XDR_FREE;
494 return ((*xdr_args)(xdrs, args_ptr));
498 svctcp_reply(xprt, msg)
500 register struct rpc_msg *msg;
502 register struct tcp_conn *cd =
503 (struct tcp_conn *)(xprt->xp_p1);
504 register XDR *xdrs = &(cd->xdrs);
508 xdrs->x_op = XDR_ENCODE;
509 msg->rm_xid = cd->x_id;
511 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
512 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
513 xdr_proc = msg->acpted_rply.ar_results.proc;
514 xdr_where = msg->acpted_rply.ar_results.where;
515 msg->acpted_rply.ar_results.proc = xdr_void;
516 msg->acpted_rply.ar_results.where = NULL;
518 if (!xdr_replymsg(xdrs, msg) ||
519 !SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_proc, xdr_where))
522 else if (!xdr_replymsg(xdrs, msg)) {
525 (void)xdrrec_endofrecord(xdrs, TRUE);