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