1 /* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
2 /*
3 * Copyright (c) 2010, Oracle America, Inc.
4 *
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * * Neither the name of the "Oracle America, Inc." nor the names of
19 * its contributors may be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
23 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
25 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34 #if !defined(lint) && defined(SCCSIDS)
35 static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
36 #endif
37
38 /*
39 * svc_tcp.c, Server side for TCP/IP based RPC.
40 *
41 * Actually implements two flavors of transporter -
42 * a tcp rendezvouser (a listner and connection establisher)
43 * and a record/tcp stream.
44 */
45
46 #include "k5-platform.h"
47 #include <unistd.h>
48 #include <gssrpc/rpc.h>
49 #include <sys/socket.h>
50 #include <port-sockets.h>
51 #include <socket-utils.h>
52 /*extern bool_t abort();
53 extern errno;
54 */
55
56 #ifndef FD_SETSIZE
57 #ifdef NBBY
58 #define NOFILE (sizeof(int) * NBBY)
59 #else
60 #define NOFILE (sizeof(int) * 8)
61 #endif
62 #endif
63
64 /*
65 * Ops vector for TCP/IP based rpc service handle
66 */
67 static bool_t svctcp_recv(SVCXPRT *, struct rpc_msg *);
68 static enum xprt_stat svctcp_stat(SVCXPRT *);
69 static bool_t svctcp_getargs(SVCXPRT *, xdrproc_t, void *);
70 static bool_t svctcp_reply(SVCXPRT *, struct rpc_msg *);
71 static bool_t svctcp_freeargs(SVCXPRT *, xdrproc_t, void *);
72 static void svctcp_destroy(SVCXPRT *);
73
74 static struct xp_ops svctcp_op = {
75 svctcp_recv,
76 svctcp_stat,
77 svctcp_getargs,
78 svctcp_reply,
79 svctcp_freeargs,
80 svctcp_destroy
81 };
82
83 /*
84 * Ops vector for TCP/IP rendezvous handler
85 */
86 static bool_t rendezvous_request(SVCXPRT *, struct rpc_msg *);
87 static bool_t abortx(void);
88 static bool_t abortx_getargs(SVCXPRT *, xdrproc_t, void *);
89 static bool_t abortx_reply(SVCXPRT *, struct rpc_msg *);
90 static bool_t abortx_freeargs(SVCXPRT *, xdrproc_t, void *);
91 static enum xprt_stat rendezvous_stat(SVCXPRT *);
92
93 static struct xp_ops svctcp_rendezvous_op = {
94 rendezvous_request,
95 rendezvous_stat,
96 abortx_getargs,
97 abortx_reply,
98 abortx_freeargs,
99 svctcp_destroy
100 };
101
102 static int readtcp(char *, caddr_t, int), writetcp(char *, caddr_t, int);
103 static SVCXPRT *makefd_xprt(int, u_int, u_int);
104
105 struct tcp_rendezvous { /* kept in xprt->xp_p1 */
106 u_int sendsize;
107 u_int recvsize;
108 };
109
110 struct tcp_conn { /* kept in xprt->xp_p1 */
111 enum xprt_stat strm_stat;
112 uint32_t x_id;
113 XDR xdrs;
114 char verf_body[MAX_AUTH_BYTES];
115 };
116
117 /*
118 * Usage:
119 * xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
120 *
121 * Creates, registers, and returns a (rpc) tcp based transporter.
122 * Once *xprt is initialized, it is registered as a transporter
123 * see (svc.h, xprt_register). This routine returns
124 * a NULL if a problem occurred.
125 *
126 * If sock<0 then a socket is created, else sock is used.
127 * If the socket, sock is not bound to a port then svctcp_create
128 * binds it to an arbitrary port. The routine then starts a tcp
129 * listener on the socket's associated port. In any (successful) case,
130 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
131 * associated port number.
132 *
133 * Since tcp streams do buffered io similar to stdio, the caller can specify
134 * how big the send and receive buffers are via the second and third parms;
135 * 0 => use the system default.
136 */
137 SVCXPRT *
svctcp_create(SOCKET sock,u_int sendsize,u_int recvsize)138 svctcp_create(
139 SOCKET sock,
140 u_int sendsize,
141 u_int recvsize)
142 {
143 bool_t madesock = FALSE;
144 SVCXPRT *xprt;
145 struct tcp_rendezvous *r;
146 struct sockaddr_storage ss;
147 struct sockaddr *sa = (struct sockaddr *)&ss;
148 socklen_t len;
149
150 if (sock == RPC_ANYSOCK) {
151 if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
152 perror("svctcp_.c - udp socket creation problem");
153 return ((SVCXPRT *)NULL);
154 }
155 set_cloexec_fd(sock);
156 madesock = TRUE;
157 memset(&ss, 0, sizeof(ss));
158 sa->sa_family = AF_INET;
159 } else {
160 len = sizeof(struct sockaddr_storage);
161 if (getsockname(sock, sa, &len) != 0) {
162 perror("svc_tcp.c - cannot getsockname");
163 return ((SVCXPRT *)NULL);
164 }
165 }
166
167 if (bindresvport_sa(sock, sa)) {
168 sa_setport(sa, 0);
169 (void)bind(sock, sa, sa_socklen(sa));
170 }
171 len = sizeof(struct sockaddr_storage);
172 if (getsockname(sock, sa, &len) != 0) {
173 perror("svc_tcp.c - cannot getsockname");
174 if (madesock)
175 (void)closesocket(sock);
176 return ((SVCXPRT *)NULL);
177 }
178 if (listen(sock, 2) != 0) {
179 perror("svctcp_.c - cannot listen");
180 if (madesock)
181 (void)closesocket(sock);
182 return ((SVCXPRT *)NULL);
183 }
184 r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
185 if (r == NULL) {
186 (void) fprintf(stderr, "svctcp_create: out of memory\n");
187 return (NULL);
188 }
189 r->sendsize = sendsize;
190 r->recvsize = recvsize;
191 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
192 if (xprt == NULL) {
193 (void) fprintf(stderr, "svctcp_create: out of memory\n");
194 return (NULL);
195 }
196 xprt->xp_p2 = NULL;
197 xprt->xp_p1 = (caddr_t)r;
198 xprt->xp_auth = NULL;
199 xprt->xp_verf = gssrpc__null_auth;
200 xprt->xp_ops = &svctcp_rendezvous_op;
201 xprt->xp_port = sa_getport(sa);
202 xprt->xp_sock = sock;
203 xprt->xp_laddrlen = 0;
204 xprt_register(xprt);
205 return (xprt);
206 }
207
208 /*
209 * Like svtcp_create(), except the routine takes any *open* UNIX file
210 * descriptor as its first input.
211 */
212 SVCXPRT *
svcfd_create(int fd,u_int sendsize,u_int recvsize)213 svcfd_create(
214 int fd,
215 u_int sendsize,
216 u_int recvsize)
217 {
218
219 return (makefd_xprt(fd, sendsize, recvsize));
220 }
221
222 static SVCXPRT *
makefd_xprt(int fd,u_int sendsize,u_int recvsize)223 makefd_xprt(
224 int fd,
225 u_int sendsize,
226 u_int recvsize)
227 {
228 SVCXPRT *xprt;
229 struct tcp_conn *cd;
230
231 #ifdef FD_SETSIZE
232 if (fd >= FD_SETSIZE) {
233 (void) fprintf(stderr, "svc_tcp: makefd_xprt: fd too high\n");
234 xprt = NULL;
235 goto done;
236 }
237 #else
238 if (fd >= NOFILE) {
239 (void) fprintf(stderr, "svc_tcp: makefd_xprt: fd too high\n");
240 xprt = NULL;
241 goto done;
242 }
243 #endif
244 xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
245 if (xprt == (SVCXPRT *)NULL) {
246 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
247 goto done;
248 }
249 cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
250 if (cd == (struct tcp_conn *)NULL) {
251 (void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
252 mem_free((char *) xprt, sizeof(SVCXPRT));
253 xprt = (SVCXPRT *)NULL;
254 goto done;
255 }
256 cd->strm_stat = XPRT_IDLE;
257 xdrrec_create(&(cd->xdrs), sendsize, recvsize,
258 (caddr_t)xprt, readtcp, writetcp);
259 xprt->xp_p2 = NULL;
260 xprt->xp_p1 = (caddr_t)cd;
261 xprt->xp_auth = NULL;
262 xprt->xp_verf.oa_base = cd->verf_body;
263 xprt->xp_addrlen = 0;
264 xprt->xp_laddrlen = 0;
265 xprt->xp_ops = &svctcp_op; /* truely deals with calls */
266 xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
267 xprt->xp_sock = fd;
268 xprt_register(xprt);
269 done:
270 return (xprt);
271 }
272
273 static bool_t
rendezvous_request(SVCXPRT * xprt,struct rpc_msg * msg)274 rendezvous_request(
275 SVCXPRT *xprt,
276 struct rpc_msg *msg)
277 {
278 SOCKET sock;
279 struct tcp_rendezvous *r;
280 struct sockaddr_in addr, laddr;
281 socklen_t len, llen;
282
283 r = (struct tcp_rendezvous *)xprt->xp_p1;
284 again:
285 len = llen = sizeof(struct sockaddr_in);
286 if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
287 &len)) < 0) {
288 if (errno == EINTR)
289 goto again;
290 return (FALSE);
291 }
292 set_cloexec_fd(sock);
293 if (getsockname(sock, (struct sockaddr *) &laddr, &llen) < 0)
294 return (FALSE);
295
296 /*
297 * make a new transporter (re-uses xprt)
298 */
299 xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
300 if (xprt == NULL) {
301 (void)closesocket(sock);
302 return (FALSE);
303 }
304 xprt->xp_raddr = addr;
305 xprt->xp_addrlen = len;
306 xprt->xp_laddr = laddr;
307 xprt->xp_laddrlen = llen;
308 return (FALSE); /* there is never an rpc msg to be processed */
309 }
310
311 static enum xprt_stat
rendezvous_stat(SVCXPRT * xprt)312 rendezvous_stat(SVCXPRT *xprt)
313 {
314
315 return (XPRT_IDLE);
316 }
317
318 static void
svctcp_destroy(SVCXPRT * xprt)319 svctcp_destroy(SVCXPRT *xprt)
320 {
321 struct tcp_conn *cd = xprt->xp_p1;
322
323 xprt_unregister(xprt);
324 (void)closesocket(xprt->xp_sock);
325 if (xprt->xp_port != 0) {
326 /* a rendezvouser socket */
327 xprt->xp_port = 0;
328 } else {
329 /* an actual connection socket */
330 XDR_DESTROY(&(cd->xdrs));
331 }
332 if (xprt->xp_auth != NULL) {
333 SVCAUTH_DESTROY(xprt->xp_auth);
334 xprt->xp_auth = NULL;
335 }
336 mem_free((caddr_t)cd, sizeof(struct tcp_conn));
337 mem_free((caddr_t)xprt, sizeof(SVCXPRT));
338 }
339
340 /*
341 * All read operations timeout after 35 seconds.
342 * A timeout is fatal for the connection.
343 */
344 static struct timeval wait_per_try = { 35, 0 };
345
346 /*
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.)
350 */
351 static int
readtcp(char * xprtptr,caddr_t buf,int len)352 readtcp(
353 char *xprtptr,
354 caddr_t buf,
355 int len)
356 {
357 SVCXPRT *xprt = (void *)xprtptr;
358 int sock = xprt->xp_sock;
359 struct timeval tout;
360 #ifdef FD_SETSIZE
361 fd_set mask;
362 fd_set readfds;
363
364 FD_ZERO(&mask);
365 FD_SET(sock, &mask);
366 #else
367 int mask = 1 << sock;
368 int readfds;
369 #endif /* def FD_SETSIZE */
370 #ifdef FD_SETSIZE
371 #define loopcond (!FD_ISSET(sock, &readfds))
372 #else
373 #define loopcond (readfds != mask)
374 #endif
375 do {
376 readfds = mask;
377 tout = wait_per_try;
378 if (select(sock + 1, &readfds, (fd_set*)NULL,
379 (fd_set*)NULL, &tout) <= 0) {
380 if (errno == EINTR) {
381 continue;
382 }
383 goto fatal_err;
384 }
385 } while (loopcond);
386 if ((len = read(sock, buf, (size_t) len)) > 0) {
387 return (len);
388 }
389 fatal_err:
390 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
391 return (-1);
392 }
393
394 /*
395 * writes data to the tcp connection.
396 * Any error is fatal and the connection is closed.
397 */
398 static int
writetcp(char * xprtptr,caddr_t buf,int len)399 writetcp(
400 char *xprtptr,
401 caddr_t buf,
402 int len)
403 {
404 SVCXPRT *xprt = (void *)xprtptr;
405 int i, cnt;
406
407 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
408 if ((i = write(xprt->xp_sock, buf, (size_t) cnt)) < 0) {
409 ((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
410 XPRT_DIED;
411 return (-1);
412 }
413 }
414 return (len);
415 }
416
417 static enum xprt_stat
svctcp_stat(SVCXPRT * xprt)418 svctcp_stat(SVCXPRT *xprt)
419 {
420 struct tcp_conn *cd = xprt->xp_p1;
421
422 if (cd->strm_stat == XPRT_DIED)
423 return (XPRT_DIED);
424 if (! xdrrec_eof(&(cd->xdrs)))
425 return (XPRT_MOREREQS);
426 return (XPRT_IDLE);
427 }
428
429 static bool_t
svctcp_recv(SVCXPRT * xprt,struct rpc_msg * msg)430 svctcp_recv(
431 SVCXPRT *xprt,
432 struct rpc_msg *msg)
433 {
434 struct tcp_conn *cd = xprt->xp_p1;
435 XDR *xdrs = &cd->xdrs;
436
437 xdrs->x_op = XDR_DECODE;
438 (void)xdrrec_skiprecord(xdrs);
439 if (xdr_callmsg(xdrs, msg)) {
440 cd->x_id = msg->rm_xid;
441 return (TRUE);
442 }
443 return (FALSE);
444 }
445
446 static bool_t
svctcp_getargs(SVCXPRT * xprt,xdrproc_t xdr_args,void * args_ptr)447 svctcp_getargs(
448 SVCXPRT *xprt,
449 xdrproc_t xdr_args,
450 void *args_ptr)
451 {
452 if (! SVCAUTH_UNWRAP(xprt->xp_auth,
453 &(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
454 xdr_args, args_ptr)) {
455 (void)svctcp_freeargs(xprt, xdr_args, args_ptr);
456 return FALSE;
457 }
458 return TRUE;
459 }
460
461 static bool_t
svctcp_freeargs(SVCXPRT * xprt,xdrproc_t xdr_args,void * args_ptr)462 svctcp_freeargs(
463 SVCXPRT *xprt,
464 xdrproc_t xdr_args,
465 void * args_ptr)
466 {
467 XDR *xdrs = &((struct tcp_conn *)(xprt->xp_p1))->xdrs;
468
469 xdrs->x_op = XDR_FREE;
470 return ((*xdr_args)(xdrs, args_ptr));
471 }
472
svctcp_reply(SVCXPRT * xprt,struct rpc_msg * msg)473 static bool_t svctcp_reply(
474 SVCXPRT *xprt,
475 struct rpc_msg *msg)
476 {
477 struct tcp_conn *cd = xprt->xp_p1;
478 XDR *xdrs = &cd->xdrs;
479 bool_t stat;
480
481 xdrproc_t xdr_results = NULL;
482 caddr_t xdr_location = 0;
483 bool_t has_args;
484
485 if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
486 msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
487 has_args = TRUE;
488 xdr_results = msg->acpted_rply.ar_results.proc;
489 xdr_location = msg->acpted_rply.ar_results.where;
490
491 msg->acpted_rply.ar_results.proc = xdr_void;
492 msg->acpted_rply.ar_results.where = NULL;
493 } else
494 has_args = FALSE;
495
496 xdrs->x_op = XDR_ENCODE;
497 msg->rm_xid = cd->x_id;
498 stat = FALSE;
499 if (xdr_replymsg(xdrs, msg) &&
500 (!has_args ||
501 (SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_results, xdr_location)))) {
502 stat = TRUE;
503 }
504 (void)xdrrec_endofrecord(xdrs, TRUE);
505 return (stat);
506 }
507
abortx(void)508 static bool_t abortx(void)
509 {
510 abort();
511 return 1;
512 }
513
abortx_getargs(SVCXPRT * xprt,xdrproc_t proc,void * info)514 static bool_t abortx_getargs(
515 SVCXPRT *xprt,
516 xdrproc_t proc,
517 void *info)
518 {
519 return abortx();
520 }
521
abortx_reply(SVCXPRT * xprt,struct rpc_msg * msg)522 static bool_t abortx_reply(SVCXPRT *xprt, struct rpc_msg *msg)
523 {
524 return abortx();
525 }
526
abortx_freeargs(SVCXPRT * xprt,xdrproc_t proc,void * info)527 static bool_t abortx_freeargs(
528 SVCXPRT *xprt, xdrproc_t proc,
529 void * info)
530 {
531 return abortx();
532 }
533