1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * University Copyright- Copyright (c) 1982, 1986, 1988
32 * The Regents of the University of California
33 * All Rights Reserved
34 *
35 * University Acknowledgment- Portions of this document are derived from
36 * software developed by the University of California, Berkeley, and its
37 * contributors.
38 */
39
40 #pragma ident "%Z%%M% %I% %E% SMI"
41
42 /*
43 * svc_tcp.c, Server side for TCP/IP based RPC.
44 *
45 * Actually implements two flavors of transporter -
46 * a tcp rendezvouser (a listner and connection establisher)
47 * and a record/tcp stream.
48 */
49
50 #include <rpc/rpc.h>
51 #include <sys/socket.h>
52 #include <sys/time.h>
53 #include <errno.h>
54 #include <syslog.h>
55 #include <malloc.h>
56 #include <stdio.h>
57
58 extern bool_t abort();
59 extern int errno;
60 extern SVCXPRT *svc_xprt_alloc();
61 extern void svc_xprt_free();
62 extern int _socket(int, int, int);
63 extern int _bind(int, const struct sockaddr *, int);
64 extern int _getsockname(int, struct sockaddr *, int *);
65 extern int _listen(int, int);
66 extern int _accept(int, struct sockaddr *, int *);
67 extern int bindresvport(int, struct sockaddr_in *);
68
69 static struct xp_ops *svctcp_ops();
70 static struct xp_ops *svctcp_rendezvous_ops();
71
72 static int readtcp(), writetcp();
73 static SVCXPRT *makefd_xprt();
74
75 struct tcp_rendezvous { /* kept in xprt->xp_p1 */
76 u_int sendsize;
77 u_int recvsize;
78 };
79
80 struct tcp_conn { /* kept in xprt->xp_p1 */
81 enum xprt_stat strm_stat;
82 uint32_t x_id;
83 XDR xdrs;
84 char verf_body[MAX_AUTH_BYTES];
85 };
86
87 /*
88 * Usage:
89 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
90 *
91 * Creates, registers, and returns a (rpc) tcp based transporter.
92 * Once *xprt is initialized, it is registered as a transporter
93 * see (svc.h, xprt_register). This routine returns
94 * a NULL if a problem occurred.
95 *
96 * If sock<0 then a socket is created, else sock is used.
97 * If the socket, sock is not bound to a port then svctcp_create
98 * binds it to an arbitrary port. The routine then starts a tcp
99 * listener on the socket's associated port. In any (successful) case,
100 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
101 * associated port number.
102 *
103 * Since tcp streams do buffered io similar to stdio, the caller can specify
104 * how big the send and receive buffers are via the second and third parms;
105 * 0 => use the system default.
106 */
107 SVCXPRT *
svctcp_create(sock,sendsize,recvsize)108 svctcp_create(sock, sendsize, recvsize)
109 register int sock;
110 u_int sendsize;
111 u_int recvsize;
112 {
113 bool_t madesock = FALSE;
114 register SVCXPRT *xprt;
115 register struct tcp_rendezvous *r;
116 struct sockaddr_in addr;
117 int len = sizeof (struct sockaddr_in);
118
119 if (sock == RPC_ANYSOCK) {
120 if ((sock = _socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
121 (void) syslog(LOG_ERR, "svctcp_create - tcp",
122 " socket creation problem: %m");
123 return ((SVCXPRT *)NULL);
124 }
125 madesock = TRUE;
126 }
127 memset((char *)&addr, 0, sizeof (addr));
128 addr.sin_family = AF_INET;
129 if (bindresvport(sock, &addr)) {
130 addr.sin_port = 0;
131 (void) _bind(sock, (struct sockaddr *)&addr, len);
132 }
133 if ((_getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
134 (_listen(sock, 2) != 0)) {
135 (void) syslog(LOG_ERR, "svctcp_create - cannot",
136 " getsockname or listen: %m");
137 if (madesock)
138 (void) close(sock);
139 return ((SVCXPRT *)NULL);
140 }
141 r = (struct tcp_rendezvous *)mem_alloc(sizeof (*r));
142 if (r == NULL) {
143 (void) syslog(LOG_ERR, "svctcp_create: out of memory");
144 if (madesock)
145 (void) close(sock);
146 return (NULL);
147 }
148 r->sendsize = sendsize;
149 r->recvsize = recvsize;
150 xprt = svc_xprt_alloc();
151 if (xprt == NULL) {
152 (void) syslog(LOG_ERR, "svctcp_create: out of memory");
153 mem_free((char *) r, sizeof (*r));
154 if (madesock)
155 (void) close(sock);
156 return (NULL);
157 }
158 xprt->xp_p2 = NULL;
159 xprt->xp_netid = NULL;
160 xprt->xp_p1 = (caddr_t)r;
161 xprt->xp_verf = _null_auth;
162 xprt->xp_ops = svctcp_rendezvous_ops();
163 xprt->xp_port = ntohs(addr.sin_port);
164 xprt->xp_sock = sock;
165 xprt->xp_rtaddr.buf = xprt->xp_raddr;
166 xprt_register(xprt);
167 return (xprt);
168 }
169
170 /*
171 * Like svtcp_create(), except the routine takes any *open* UNIX file
172 * descriptor as its first input.
173 */
174 SVCXPRT *
svcfd_create(fd,sendsize,recvsize)175 svcfd_create(fd, sendsize, recvsize)
176 int fd;
177 u_int sendsize;
178 u_int recvsize;
179 {
180
181 return (makefd_xprt(fd, sendsize, recvsize));
182 }
183
184 static SVCXPRT *
makefd_xprt(fd,sendsize,recvsize)185 makefd_xprt(fd, sendsize, recvsize)
186 int fd;
187 u_int sendsize;
188 u_int recvsize;
189 {
190 register SVCXPRT *xprt;
191 register struct tcp_conn *cd;
192
193 xprt = svc_xprt_alloc();
194 if (xprt == (SVCXPRT *)NULL) {
195 (void) syslog(LOG_ERR, "svc_tcp: makefd_xprt: out of memory");
196 goto done;
197 }
198 cd = (struct tcp_conn *)mem_alloc(sizeof (struct tcp_conn));
199 if (cd == (struct tcp_conn *)NULL) {
200 (void) syslog(LOG_ERR, "svc_tcp: makefd_xprt: out of memory");
201 svc_xprt_free(xprt);
202 xprt = (SVCXPRT *)NULL;
203 goto done;
204 }
205 cd->strm_stat = XPRT_IDLE;
206 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
207 (caddr_t)xprt, readtcp, writetcp);
208 xprt->xp_p2 = NULL;
209 xprt->xp_netid = NULL;
210 xprt->xp_p1 = (caddr_t)cd;
211 xprt->xp_verf.oa_base = cd->verf_body;
212 xprt->xp_addrlen = 0;
213 xprt->xp_ops = svctcp_ops(); /* truely deals with calls */
214 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
215 xprt->xp_sock = fd;
216 /* to handle svc_getcaller() properly */
217 xprt->xp_rtaddr.buf = xprt->xp_raddr;
218 xprt_register(xprt);
219 done:
220 return (xprt);
221 }
222
223 static bool_t
rendezvous_request(xprt,rpc_msg)224 rendezvous_request(xprt, rpc_msg)
225 register SVCXPRT *xprt;
226 struct rpc_msg *rpc_msg;
227 {
228 int sock;
229 struct tcp_rendezvous *r;
230 struct sockaddr_in addr;
231 int len;
232
233 r = (struct tcp_rendezvous *)xprt->xp_p1;
234 again:
235 len = sizeof (struct sockaddr_in);
236 if ((sock = _accept(xprt->xp_sock, (struct sockaddr *)&addr,
237 &len)) < 0) {
238 if (errno == EINTR)
239 goto again;
240 return (FALSE);
241 }
242 /*
243 * make a new transporter (re-uses xprt)
244 */
245 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
246
247 memcpy((char *)&xprt->xp_raddr, (char *)&addr, len);
248 xprt->xp_addrlen = len;
249 return (FALSE); /* there is never an rpc msg to be processed */
250 }
251
252 static enum xprt_stat
rendezvous_stat(xprt)253 rendezvous_stat(xprt)
254 SVCXPRT *xprt;
255 {
256
257 return (XPRT_IDLE);
258 }
259
260 static void
svctcp_destroy(xprt)261 svctcp_destroy(xprt)
262 register SVCXPRT *xprt;
263 {
264 register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
265
266 xprt_unregister(xprt);
267 (void) close(xprt->xp_sock);
268 if (xprt->xp_port != 0) {
269 /* a rendezvouser socket */
270 xprt->xp_port = 0;
271 } else {
272 /* an actual connection socket */
273 XDR_DESTROY(&(cd->xdrs));
274 }
275 mem_free((caddr_t)cd, sizeof (struct tcp_conn));
276 svc_xprt_free(xprt);
277 }
278
279 /*
280 * All read operations timeout after 35 seconds.
281 * A timeout is fatal for the connection.
282 */
283 static struct timeval wait_per_try = { 35, 0 };
284
285 /*
286 * reads data from the tcp conection.
287 * any error is fatal and the connection is closed.
288 * (And a read of zero bytes is a half closed stream => error.)
289 */
290 static int
readtcp(xprt,buf,len)291 readtcp(xprt, buf, len)
292 register SVCXPRT *xprt;
293 caddr_t buf;
294 register int len;
295 {
296 register int sock = xprt->xp_sock;
297 fd_set mask;
298 fd_set readfds;
299
300 FD_ZERO(&mask);
301 FD_SET(sock, &mask);
302 do {
303 readfds = mask;
304 if (select(__rpc_dtbsize(), &readfds, NULL, NULL,
305 &wait_per_try) <= 0) {
306 if (errno == EINTR) {
307 continue;
308 }
309 goto fatal_err;
310 }
311 } while (!FD_ISSET(sock, &readfds));
312 if ((len = read(sock, buf, len)) > 0) {
313 return (len);
314 }
315 fatal_err:
316 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
317 return (-1);
318 }
319
320 /*
321 * writes data to the tcp connection.
322 * Any error is fatal and the connection is closed.
323 */
324 static int
writetcp(xprt,buf,len)325 writetcp(xprt, buf, len)
326 register SVCXPRT *xprt;
327 caddr_t buf;
328 int len;
329 {
330 register int i, cnt;
331
332 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
333 if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
334 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
335 XPRT_DIED;
336 return (-1);
337 }
338 }
339 return (len);
340 }
341
342 static enum xprt_stat
svctcp_stat(xprt)343 svctcp_stat(xprt)
344 SVCXPRT *xprt;
345 {
346 register struct tcp_conn *cd =
347 (struct tcp_conn *)(xprt->xp_p1);
348
349 if (cd->strm_stat == XPRT_DIED)
350 return (XPRT_DIED);
351 if (! xdrrec_eof(&(cd->xdrs)))
352 return (XPRT_MOREREQS);
353 return (XPRT_IDLE);
354 }
355
356 static bool_t
svctcp_recv(xprt,msg)357 svctcp_recv(xprt, msg)
358 SVCXPRT *xprt;
359 register struct rpc_msg *msg;
360 {
361 register struct tcp_conn *cd =
362 (struct tcp_conn *)(xprt->xp_p1);
363 register XDR *xdrs = &(cd->xdrs);
364
365 xdrs->x_op = XDR_DECODE;
366 (void) xdrrec_skiprecord(xdrs);
367 if (xdr_callmsg(xdrs, msg)) {
368 cd->x_id = msg->rm_xid;
369 return (TRUE);
370 }
371 return (FALSE);
372 }
373
374 static bool_t
svctcp_getargs(xprt,xdr_args,args_ptr)375 svctcp_getargs(xprt, xdr_args, args_ptr)
376 SVCXPRT *xprt;
377 xdrproc_t xdr_args;
378 caddr_t args_ptr;
379 {
380
381 return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
382 args_ptr));
383 }
384
385 static bool_t
svctcp_freeargs(xprt,xdr_args,args_ptr)386 svctcp_freeargs(xprt, xdr_args, args_ptr)
387 SVCXPRT *xprt;
388 xdrproc_t xdr_args;
389 caddr_t args_ptr;
390 {
391 register XDR *xdrs =
392 &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
393
394 xdrs->x_op = XDR_FREE;
395 return ((*xdr_args)(xdrs, args_ptr));
396 }
397
398 static bool_t
svctcp_reply(xprt,msg)399 svctcp_reply(xprt, msg)
400 SVCXPRT *xprt;
401 register struct rpc_msg *msg;
402 {
403 register struct tcp_conn *cd =
404 (struct tcp_conn *)(xprt->xp_p1);
405 register XDR *xdrs = &(cd->xdrs);
406 register bool_t stat;
407
408 xdrs->x_op = XDR_ENCODE;
409 msg->rm_xid = cd->x_id;
410 stat = xdr_replymsg(xdrs, msg);
411 (void) xdrrec_endofrecord(xdrs, TRUE);
412 return (stat);
413 }
414
415
416 static struct xp_ops *
svctcp_ops()417 svctcp_ops()
418 {
419 static struct xp_ops ops;
420
421 if (ops.xp_recv == NULL) {
422 ops.xp_recv = svctcp_recv;
423 ops.xp_stat = svctcp_stat;
424 ops.xp_getargs = svctcp_getargs;
425 ops.xp_reply = svctcp_reply;
426 ops.xp_freeargs = svctcp_freeargs;
427 ops.xp_destroy = svctcp_destroy;
428 }
429 return (&ops);
430 }
431
432
433 static struct xp_ops *
svctcp_rendezvous_ops()434 svctcp_rendezvous_ops()
435 {
436 static struct xp_ops ops;
437
438 if (ops.xp_recv == NULL) {
439 ops.xp_recv = rendezvous_request;
440 ops.xp_stat = rendezvous_stat;
441 ops.xp_getargs = abort;
442 ops.xp_reply = abort;
443 ops.xp_freeargs = abort,
444 ops.xp_destroy = svctcp_destroy;
445 }
446 return (&ops);
447 }
448