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
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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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
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
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 *sccsid = "from: @(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/
32 /*static char *sccsid = "from: @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC";*/
33 static char *rcsid = "$FreeBSD: src/lib/libc/rpc/svc_tcp.c,v 1.18.2.3 2001/09/05 22:29:23 dec Exp $";
37 * svc_tcp.c, Server side for TCP/IP based RPC.
39 * Copyright (C) 1984, Sun Microsystems, Inc.
41 * Actually implements two flavors of transporter -
42 * a tcp rendezvouser (a listner and connection establisher)
43 * and a record/tcp stream.
51 #include <sys/socket.h>
52 #include <sys/ioctl.h>
56 * Ops vector for TCP/IP based rpc service handle
58 static bool_t svctcp_recv();
59 static enum xprt_stat svctcp_stat();
60 static bool_t svctcp_getargs();
61 static bool_t svctcp_reply();
62 static bool_t svctcp_freeargs();
63 static void svctcp_destroy();
65 static struct xp_ops svctcp_op = {
75 * Ops vector for TCP/IP rendezvous handler
77 static bool_t rendezvous_request();
78 static enum xprt_stat rendezvous_stat();
80 static struct xp_ops svctcp_rendezvous_op = {
89 static int readtcp(), writetcp();
90 static SVCXPRT *makefd_xprt();
92 struct tcp_rendezvous { /* kept in xprt->xp_p1 */
97 struct tcp_conn { /* kept in xprt->xp_p1 */
98 enum xprt_stat strm_stat;
101 char verf_body[MAX_AUTH_BYTES];
106 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
108 * Creates, registers, and returns a (rpc) tcp based transporter.
109 * Once *xprt is initialized, it is registered as a transporter
110 * see (svc.h, xprt_register). This routine returns
111 * a NULL if a problem occurred.
113 * If sock<0 then a socket is created, else sock is used.
114 * If the socket, sock is not bound to a port then svctcp_create
115 * binds it to an arbitrary port. The routine then starts a tcp
116 * listener on the socket's associated port. In any (successful) case,
117 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
118 * associated port number.
120 * Since tcp streams do buffered io similar to stdio, the caller can specify
121 * how big the send and receive buffers are via the second and third parms;
122 * 0 => use the system default.
125 svctcp_create(sock, sendsize, recvsize)
130 bool_t madesock = FALSE;
131 register SVCXPRT *xprt;
132 register struct tcp_rendezvous *r;
133 struct sockaddr_in addr;
134 int len = sizeof(struct sockaddr_in);
137 if (sock == RPC_ANYSOCK) {
138 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
139 perror("svctcp_.c - tcp socket creation problem");
140 return ((SVCXPRT *)NULL);
145 if (ioctl(sock, FIONBIO, &on) < 0) {
146 perror("svc_tcp.c - cannot turn on non-blocking mode");
149 return ((SVCXPRT *)NULL);
151 memset(&addr, 0, sizeof (addr));
152 addr.sin_len = sizeof(struct sockaddr_in);
153 addr.sin_family = AF_INET;
154 if (bindresvport(sock, &addr)) {
156 (void)bind(sock, (struct sockaddr *)&addr, len);
158 if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
159 (listen(sock, 2) != 0)) {
160 perror("svctcp_.c - cannot getsockname or listen");
163 return ((SVCXPRT *)NULL);
165 r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
167 (void) fprintf(stderr, "svctcp_create: out of memory\n");
170 r->sendsize = sendsize;
171 r->recvsize = recvsize;
172 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
174 (void) fprintf(stderr, "svctcp_create: out of memory\n");
178 xprt->xp_p1 = (caddr_t)r;
179 xprt->xp_verf = _null_auth;
180 xprt->xp_ops = &svctcp_rendezvous_op;
181 xprt->xp_port = ntohs(addr.sin_port);
182 xprt->xp_sock = sock;
188 * Like svtcp_create(), except the routine takes any *open* UNIX file
189 * descriptor as its first input.
192 svcfd_create(fd, sendsize, recvsize)
198 return (makefd_xprt(fd, sendsize, recvsize));
202 makefd_xprt(fd, sendsize, recvsize)
207 register SVCXPRT *xprt;
208 register struct tcp_conn *cd;
210 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
211 if (xprt == (SVCXPRT *)NULL) {
212 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
215 cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
216 if (cd == (struct tcp_conn *)NULL) {
217 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
218 mem_free((char *) xprt, sizeof(SVCXPRT));
219 xprt = (SVCXPRT *)NULL;
222 cd->strm_stat = XPRT_IDLE;
223 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
224 (caddr_t)xprt, readtcp, writetcp);
226 xprt->xp_p1 = (caddr_t)cd;
227 xprt->xp_verf.oa_base = cd->verf_body;
228 xprt->xp_addrlen = 0;
229 xprt->xp_ops = &svctcp_op; /* truely deals with calls */
230 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
238 rendezvous_request(xprt)
239 register SVCXPRT *xprt;
242 struct tcp_rendezvous *r;
243 struct sockaddr_in addr;
247 r = (struct tcp_rendezvous *)xprt->xp_p1;
249 len = sizeof(struct sockaddr_in);
250 if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
257 * Guard against FTP bounce attacks.
259 if (addr.sin_port == htons(20)) {
264 * The listening socket is in FIONBIO mode and we inherit it.
267 if (ioctl(sock, FIONBIO, &off) < 0) {
272 * make a new transporter (re-uses xprt)
274 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
275 xprt->xp_raddr = addr;
276 xprt->xp_addrlen = len;
277 return (FALSE); /* there is never an rpc msg to be processed */
280 static enum xprt_stat
289 register SVCXPRT *xprt;
291 register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
293 xprt_unregister(xprt);
294 (void)_close(xprt->xp_sock);
295 if (xprt->xp_port != 0) {
296 /* a rendezvouser socket */
299 /* an actual connection socket */
300 XDR_DESTROY(&(cd->xdrs));
302 mem_free((caddr_t)cd, sizeof(struct tcp_conn));
303 mem_free((caddr_t)xprt, sizeof(SVCXPRT));
307 * All read operations timeout after 35 seconds.
308 * A timeout is fatal for the connection.
310 static struct timeval wait_per_try = { 35, 0 };
313 * reads data from the tcp conection.
314 * any error is fatal and the connection is closed.
315 * (And a read of zero bytes is a half closed stream => error.)
317 * Note: we have to be careful here not to allow ourselves to become
318 * blocked too long in this routine. While we're waiting for data from one
319 * client, another client may be trying to connect. To avoid this situation,
320 * some code from svc_run() is transplanted here: the select() loop checks
321 * all RPC descriptors including the one we want and calls svc_getreqset2()
322 * to handle new requests if any are detected.
325 readtcp(xprt, buf, len)
326 register SVCXPRT *xprt;
330 register int sock = xprt->xp_sock;
331 struct timeval start, delta, tv;
332 struct timeval tmp1, tmp2;
334 extern fd_set *__svc_fdset;
335 extern int __svc_fdsetsize;
337 delta = wait_per_try;
339 gettimeofday(&start, NULL);
341 int bytes = howmany(__svc_fdsetsize, NFDBITS) *
345 fds = (fd_set *)malloc(bytes);
348 memcpy(fds, __svc_fdset, bytes);
350 /* XXX we know the other bits are still clear */
352 tv = delta; /* in case select() implements writeback */
353 switch (select(svc_maxfd + 1, fds, NULL, NULL, &tv)) {
355 memset(fds, 0, bytes);
358 gettimeofday(&tmp1, NULL);
359 timersub(&tmp1, &start, &tmp2);
360 timersub(&wait_per_try, &tmp2, &tmp1);
361 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
368 if (!FD_ISSET(sock, fds)) {
369 svc_getreqset2(fds, svc_maxfd + 1);
370 gettimeofday(&tmp1, NULL);
371 timersub(&tmp1, &start, &tmp2);
372 timersub(&wait_per_try, &tmp2, &tmp1);
373 if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
379 } while (!FD_ISSET(sock, fds));
380 if ((len = _read(sock, buf, len)) > 0) {
386 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
393 * writes data to the tcp connection.
394 * Any error is fatal and the connection is closed.
397 writetcp(xprt, buf, len)
398 register SVCXPRT *xprt;
404 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
405 if ((i = _write(xprt->xp_sock, buf, cnt)) < 0) {
406 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
414 static enum xprt_stat
418 register struct tcp_conn *cd =
419 (struct tcp_conn *)(xprt->xp_p1);
421 if (cd->strm_stat == XPRT_DIED)
423 if (! xdrrec_eof(&(cd->xdrs)))
424 return (XPRT_MOREREQS);
429 svctcp_recv(xprt, msg)
431 register struct rpc_msg *msg;
433 register struct tcp_conn *cd =
434 (struct tcp_conn *)(xprt->xp_p1);
435 register XDR *xdrs = &(cd->xdrs);
437 xdrs->x_op = XDR_DECODE;
438 (void)xdrrec_skiprecord(xdrs);
439 if (xdr_callmsg(xdrs, msg)) {
440 cd->x_id = msg->rm_xid;
443 cd->strm_stat = XPRT_DIED; /* XXXX */
448 svctcp_getargs(xprt, xdr_args, args_ptr)
454 return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
458 svctcp_freeargs(xprt, xdr_args, args_ptr)
464 &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
466 xdrs->x_op = XDR_FREE;
467 return ((*xdr_args)(xdrs, args_ptr));
471 svctcp_reply(xprt, msg)
473 register struct rpc_msg *msg;
475 register struct tcp_conn *cd =
476 (struct tcp_conn *)(xprt->xp_p1);
477 register XDR *xdrs = &(cd->xdrs);
478 register bool_t stat;
480 xdrs->x_op = XDR_ENCODE;
481 msg->rm_xid = cd->x_id;
482 stat = xdr_replymsg(xdrs, msg);
483 (void)xdrrec_endofrecord(xdrs, TRUE);