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28f540f4 | 1 | /* |
a7ab6ec8 | 2 | * svc_tcp.c, Server side for TCP/IP based RPC. |
cbd3dceb | 3 | * |
04277e02 | 4 | * Copyright (C) 2012-2019 Free Software Foundation, Inc. |
14bc93a9 JL |
5 | * This file is part of the GNU C Library. |
6 | * | |
7 | * The GNU C Library is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * The GNU C Library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with the GNU C Library; if not, see | |
19 | * <http://www.gnu.org/licenses/>. | |
20 | * | |
a7ab6ec8 | 21 | * Copyright (c) 2010, Oracle America, Inc. |
cbd3dceb | 22 | * |
a7ab6ec8 UD |
23 | * Redistribution and use in source and binary forms, with or without |
24 | * modification, are permitted provided that the following conditions are | |
25 | * met: | |
cbd3dceb | 26 | * |
a7ab6ec8 UD |
27 | * * Redistributions of source code must retain the above copyright |
28 | * notice, this list of conditions and the following disclaimer. | |
29 | * * Redistributions in binary form must reproduce the above | |
30 | * copyright notice, this list of conditions and the following | |
31 | * disclaimer in the documentation and/or other materials | |
32 | * provided with the distribution. | |
33 | * * Neither the name of the "Oracle America, Inc." nor the names of its | |
34 | * contributors may be used to endorse or promote products derived | |
35 | * from this software without specific prior written permission. | |
cb636bb2 | 36 | * |
a7ab6ec8 UD |
37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
38 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
39 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
40 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
41 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
42 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
43 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE | |
44 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
45 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
46 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
47 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
48 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28f540f4 RM |
49 | * |
50 | * Actually implements two flavors of transporter - | |
6d52618b | 51 | * a tcp rendezvouser (a listener and connection establisher) |
28f540f4 RM |
52 | * and a record/tcp stream. |
53 | */ | |
54 | ||
55 | #include <stdio.h> | |
e7fd8a39 UD |
56 | #include <unistd.h> |
57 | #include <string.h> | |
4360eafd | 58 | #include <libintl.h> |
28f540f4 RM |
59 | #include <rpc/rpc.h> |
60 | #include <sys/socket.h> | |
090ca000 | 61 | #include <sys/poll.h> |
28f540f4 | 62 | #include <errno.h> |
e7fd8a39 | 63 | #include <stdlib.h> |
28f540f4 | 64 | |
3ce1f295 UD |
65 | #include <wchar.h> |
66 | #include <libio/iolibio.h> | |
82f43dd2 | 67 | #include <shlib-compat.h> |
50304ef0 | 68 | |
28f540f4 RM |
69 | /* |
70 | * Ops vector for TCP/IP based rpc service handle | |
71 | */ | |
e7fd8a39 UD |
72 | static bool_t svctcp_recv (SVCXPRT *, struct rpc_msg *); |
73 | static enum xprt_stat svctcp_stat (SVCXPRT *); | |
74 | static bool_t svctcp_getargs (SVCXPRT *, xdrproc_t, caddr_t); | |
75 | static bool_t svctcp_reply (SVCXPRT *, struct rpc_msg *); | |
76 | static bool_t svctcp_freeargs (SVCXPRT *, xdrproc_t, caddr_t); | |
77 | static void svctcp_destroy (SVCXPRT *); | |
78 | ||
79 | static const struct xp_ops svctcp_op = | |
80 | { | |
81 | svctcp_recv, | |
82 | svctcp_stat, | |
83 | svctcp_getargs, | |
84 | svctcp_reply, | |
85 | svctcp_freeargs, | |
86 | svctcp_destroy | |
28f540f4 RM |
87 | }; |
88 | ||
89 | /* | |
90 | * Ops vector for TCP/IP rendezvous handler | |
91 | */ | |
e7fd8a39 UD |
92 | static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *); |
93 | static enum xprt_stat rendezvous_stat (SVCXPRT *); | |
a49d0179 | 94 | static void svctcp_rendezvous_abort (void) __attribute__ ((__noreturn__)); |
4b9afc43 UD |
95 | |
96 | /* This function makes sure abort() relocation goes through PLT | |
97 | and thus can be lazy bound. */ | |
98 | static void | |
99 | svctcp_rendezvous_abort (void) | |
100 | { | |
101 | abort (); | |
102 | }; | |
e7fd8a39 UD |
103 | |
104 | static const struct xp_ops svctcp_rendezvous_op = | |
105 | { | |
106 | rendezvous_request, | |
107 | rendezvous_stat, | |
4b9afc43 UD |
108 | (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort, |
109 | (bool_t (*) (SVCXPRT *, struct rpc_msg *)) svctcp_rendezvous_abort, | |
110 | (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) svctcp_rendezvous_abort, | |
e7fd8a39 | 111 | svctcp_destroy |
28f540f4 RM |
112 | }; |
113 | ||
e7fd8a39 UD |
114 | static int readtcp (char*, char *, int); |
115 | static int writetcp (char *, char *, int); | |
ca4ec803 | 116 | static SVCXPRT *makefd_xprt (int, u_int, u_int); |
28f540f4 | 117 | |
e7fd8a39 UD |
118 | struct tcp_rendezvous |
119 | { /* kept in xprt->xp_p1 */ | |
120 | u_int sendsize; | |
121 | u_int recvsize; | |
122 | }; | |
28f540f4 | 123 | |
e7fd8a39 UD |
124 | struct tcp_conn |
125 | { /* kept in xprt->xp_p1 */ | |
126 | enum xprt_stat strm_stat; | |
127 | u_long x_id; | |
128 | XDR xdrs; | |
129 | char verf_body[MAX_AUTH_BYTES]; | |
130 | }; | |
28f540f4 RM |
131 | |
132 | /* | |
133 | * Usage: | |
e7fd8a39 | 134 | * xprt = svctcp_create(sock, send_buf_size, recv_buf_size); |
28f540f4 RM |
135 | * |
136 | * Creates, registers, and returns a (rpc) tcp based transporter. | |
137 | * Once *xprt is initialized, it is registered as a transporter | |
138 | * see (svc.h, xprt_register). This routine returns | |
139 | * a NULL if a problem occurred. | |
140 | * | |
141 | * If sock<0 then a socket is created, else sock is used. | |
142 | * If the socket, sock is not bound to a port then svctcp_create | |
143 | * binds it to an arbitrary port. The routine then starts a tcp | |
144 | * listener on the socket's associated port. In any (successful) case, | |
145 | * xprt->xp_sock is the registered socket number and xprt->xp_port is the | |
146 | * associated port number. | |
147 | * | |
148 | * Since tcp streams do buffered io similar to stdio, the caller can specify | |
149 | * how big the send and receive buffers are via the second and third parms; | |
150 | * 0 => use the system default. | |
151 | */ | |
152 | SVCXPRT * | |
e7fd8a39 | 153 | svctcp_create (int sock, u_int sendsize, u_int recvsize) |
28f540f4 | 154 | { |
e7fd8a39 UD |
155 | bool_t madesock = FALSE; |
156 | SVCXPRT *xprt; | |
157 | struct tcp_rendezvous *r; | |
158 | struct sockaddr_in addr; | |
41df5ed4 | 159 | socklen_t len = sizeof (struct sockaddr_in); |
e7fd8a39 UD |
160 | |
161 | if (sock == RPC_ANYSOCK) | |
162 | { | |
50304ef0 | 163 | if ((sock = __socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) |
e7fd8a39 | 164 | { |
e852e889 | 165 | perror (_("svc_tcp.c - tcp socket creation problem")); |
e7fd8a39 | 166 | return (SVCXPRT *) NULL; |
28f540f4 | 167 | } |
e7fd8a39 UD |
168 | madesock = TRUE; |
169 | } | |
d99431e5 | 170 | memset ((char *) &addr, 0, sizeof (addr)); |
e7fd8a39 | 171 | addr.sin_family = AF_INET; |
a585ba22 | 172 | if (bindresvport (sock, &addr)) |
e7fd8a39 UD |
173 | { |
174 | addr.sin_port = 0; | |
b2bffca2 | 175 | (void) __bind (sock, (struct sockaddr *) &addr, len); |
e7fd8a39 | 176 | } |
b2bffca2 | 177 | if ((__getsockname (sock, (struct sockaddr *) &addr, &len) != 0) || |
a3a449c1 | 178 | (__listen (sock, SOMAXCONN) != 0)) |
e7fd8a39 | 179 | { |
e852e889 | 180 | perror (_("svc_tcp.c - cannot getsockname or listen")); |
e7fd8a39 | 181 | if (madesock) |
50304ef0 | 182 | (void) __close (sock); |
e7fd8a39 UD |
183 | return (SVCXPRT *) NULL; |
184 | } | |
185 | r = (struct tcp_rendezvous *) mem_alloc (sizeof (*r)); | |
51028f34 UD |
186 | xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); |
187 | if (r == NULL || xprt == NULL) | |
e7fd8a39 | 188 | { |
1d20f7f8 | 189 | (void) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n")); |
2e3e5db6 UD |
190 | mem_free (r, sizeof (*r)); |
191 | mem_free (xprt, sizeof (SVCXPRT)); | |
e7fd8a39 UD |
192 | return NULL; |
193 | } | |
194 | r->sendsize = sendsize; | |
195 | r->recvsize = recvsize; | |
e7fd8a39 UD |
196 | xprt->xp_p2 = NULL; |
197 | xprt->xp_p1 = (caddr_t) r; | |
198 | xprt->xp_verf = _null_auth; | |
199 | xprt->xp_ops = &svctcp_rendezvous_op; | |
200 | xprt->xp_port = ntohs (addr.sin_port); | |
201 | xprt->xp_sock = sock; | |
202 | xprt_register (xprt); | |
203 | return xprt; | |
28f540f4 | 204 | } |
7b57bfe5 UD |
205 | #ifdef EXPORT_RPC_SYMBOLS |
206 | libc_hidden_def (svctcp_create) | |
207 | #else | |
021db4be | 208 | libc_hidden_nolink_sunrpc (svctcp_create, GLIBC_2_0) |
7b57bfe5 | 209 | #endif |
28f540f4 RM |
210 | |
211 | /* | |
212 | * Like svtcp_create(), except the routine takes any *open* UNIX file | |
213 | * descriptor as its first input. | |
214 | */ | |
215 | SVCXPRT * | |
e7fd8a39 | 216 | svcfd_create (int fd, u_int sendsize, u_int recvsize) |
28f540f4 | 217 | { |
e7fd8a39 | 218 | return makefd_xprt (fd, sendsize, recvsize); |
28f540f4 | 219 | } |
021db4be | 220 | libc_hidden_nolink_sunrpc (svcfd_create, GLIBC_2_0) |
28f540f4 RM |
221 | |
222 | static SVCXPRT * | |
e7fd8a39 | 223 | makefd_xprt (int fd, u_int sendsize, u_int recvsize) |
28f540f4 | 224 | { |
e7fd8a39 UD |
225 | SVCXPRT *xprt; |
226 | struct tcp_conn *cd; | |
227 | ||
228 | xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT)); | |
e7fd8a39 | 229 | cd = (struct tcp_conn *) mem_alloc (sizeof (struct tcp_conn)); |
51028f34 | 230 | if (xprt == (SVCXPRT *) NULL || cd == NULL) |
e7fd8a39 | 231 | { |
1d20f7f8 UD |
232 | (void) __fxprintf (NULL, "%s: %s", "svc_tcp: makefd_xprt", |
233 | _("out of memory\n")); | |
2e3e5db6 UD |
234 | mem_free (xprt, sizeof (SVCXPRT)); |
235 | mem_free (cd, sizeof (struct tcp_conn)); | |
51028f34 | 236 | return NULL; |
e7fd8a39 UD |
237 | } |
238 | cd->strm_stat = XPRT_IDLE; | |
7b57bfe5 UD |
239 | xdrrec_create (&(cd->xdrs), sendsize, recvsize, |
240 | (caddr_t) xprt, readtcp, writetcp); | |
e7fd8a39 UD |
241 | xprt->xp_p2 = NULL; |
242 | xprt->xp_p1 = (caddr_t) cd; | |
243 | xprt->xp_verf.oa_base = cd->verf_body; | |
244 | xprt->xp_addrlen = 0; | |
245 | xprt->xp_ops = &svctcp_op; /* truly deals with calls */ | |
246 | xprt->xp_port = 0; /* this is a connection, not a rendezvouser */ | |
247 | xprt->xp_sock = fd; | |
248 | xprt_register (xprt); | |
e7fd8a39 | 249 | return xprt; |
28f540f4 RM |
250 | } |
251 | ||
252 | static bool_t | |
e7fd8a39 | 253 | rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg) |
28f540f4 | 254 | { |
e7fd8a39 UD |
255 | int sock; |
256 | struct tcp_rendezvous *r; | |
257 | struct sockaddr_in addr; | |
41df5ed4 | 258 | socklen_t len; |
e7fd8a39 UD |
259 | |
260 | r = (struct tcp_rendezvous *) xprt->xp_p1; | |
261 | again: | |
262 | len = sizeof (struct sockaddr_in); | |
50304ef0 | 263 | if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0) |
e7fd8a39 UD |
264 | { |
265 | if (errno == EINTR) | |
266 | goto again; | |
14bc93a9 | 267 | __svc_accept_failed (); |
e7fd8a39 UD |
268 | return FALSE; |
269 | } | |
270 | /* | |
271 | * make a new transporter (re-uses xprt) | |
272 | */ | |
273 | xprt = makefd_xprt (sock, r->sendsize, r->recvsize); | |
c1301d9a | 274 | memcpy (&xprt->xp_raddr, &addr, sizeof (addr)); |
e7fd8a39 UD |
275 | xprt->xp_addrlen = len; |
276 | return FALSE; /* there is never an rpc msg to be processed */ | |
28f540f4 RM |
277 | } |
278 | ||
279 | static enum xprt_stat | |
e7fd8a39 | 280 | rendezvous_stat (SVCXPRT *xprt) |
28f540f4 | 281 | { |
e7fd8a39 | 282 | return XPRT_IDLE; |
28f540f4 RM |
283 | } |
284 | ||
285 | static void | |
e7fd8a39 | 286 | svctcp_destroy (SVCXPRT *xprt) |
28f540f4 | 287 | { |
e7fd8a39 UD |
288 | struct tcp_conn *cd = (struct tcp_conn *) xprt->xp_p1; |
289 | ||
290 | xprt_unregister (xprt); | |
50304ef0 | 291 | (void) __close (xprt->xp_sock); |
e7fd8a39 UD |
292 | if (xprt->xp_port != 0) |
293 | { | |
294 | /* a rendezvouser socket */ | |
295 | xprt->xp_port = 0; | |
296 | } | |
297 | else | |
298 | { | |
299 | /* an actual connection socket */ | |
300 | XDR_DESTROY (&(cd->xdrs)); | |
301 | } | |
302 | mem_free ((caddr_t) cd, sizeof (struct tcp_conn)); | |
303 | mem_free ((caddr_t) xprt, sizeof (SVCXPRT)); | |
28f540f4 RM |
304 | } |
305 | ||
28f540f4 RM |
306 | |
307 | /* | |
6d52618b | 308 | * reads data from the tcp connection. |
28f540f4 RM |
309 | * any error is fatal and the connection is closed. |
310 | * (And a read of zero bytes is a half closed stream => error.) | |
311 | */ | |
312 | static int | |
e7fd8a39 | 313 | readtcp (char *xprtptr, char *buf, int len) |
28f540f4 | 314 | { |
e7fd8a39 UD |
315 | SVCXPRT *xprt = (SVCXPRT *)xprtptr; |
316 | int sock = xprt->xp_sock; | |
090ca000 UD |
317 | int milliseconds = 35 * 1000; |
318 | struct pollfd pollfd; | |
319 | ||
320 | do | |
e7fd8a39 | 321 | { |
090ca000 UD |
322 | pollfd.fd = sock; |
323 | pollfd.events = POLLIN; | |
324 | switch (__poll (&pollfd, 1, milliseconds)) | |
e7fd8a39 | 325 | { |
090ca000 | 326 | case -1: |
e7fd8a39 | 327 | if (errno == EINTR) |
fed8f7f7 | 328 | continue; |
090ca000 UD |
329 | /*FALLTHROUGH*/ |
330 | case 0: | |
e7fd8a39 | 331 | goto fatal_err; |
090ca000 | 332 | default: |
7b57bfe5 UD |
333 | if ((pollfd.revents & POLLERR) || (pollfd.revents & POLLHUP) |
334 | || (pollfd.revents & POLLNVAL)) | |
335 | goto fatal_err; | |
090ca000 | 336 | break; |
7d1de115 | 337 | } |
e7fd8a39 | 338 | } |
090ca000 | 339 | while ((pollfd.revents & POLLIN) == 0); |
fed8f7f7 | 340 | |
50304ef0 | 341 | if ((len = __read (sock, buf, len)) > 0) |
fed8f7f7 UD |
342 | return len; |
343 | ||
090ca000 | 344 | fatal_err: |
e7fd8a39 UD |
345 | ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED; |
346 | return -1; | |
28f540f4 RM |
347 | } |
348 | ||
349 | /* | |
350 | * writes data to the tcp connection. | |
351 | * Any error is fatal and the connection is closed. | |
352 | */ | |
353 | static int | |
e7fd8a39 | 354 | writetcp (char *xprtptr, char * buf, int len) |
28f540f4 | 355 | { |
e7fd8a39 UD |
356 | SVCXPRT *xprt = (SVCXPRT *)xprtptr; |
357 | int i, cnt; | |
358 | ||
359 | for (cnt = len; cnt > 0; cnt -= i, buf += i) | |
360 | { | |
50304ef0 | 361 | if ((i = __write (xprt->xp_sock, buf, cnt)) < 0) |
e7fd8a39 | 362 | { |
090ca000 UD |
363 | ((struct tcp_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED; |
364 | return -1; | |
28f540f4 | 365 | } |
e7fd8a39 | 366 | } |
090ca000 | 367 | return len; |
28f540f4 RM |
368 | } |
369 | ||
370 | static enum xprt_stat | |
e7fd8a39 | 371 | svctcp_stat (SVCXPRT *xprt) |
28f540f4 | 372 | { |
e7fd8a39 UD |
373 | struct tcp_conn *cd = |
374 | (struct tcp_conn *) (xprt->xp_p1); | |
375 | ||
376 | if (cd->strm_stat == XPRT_DIED) | |
090ca000 | 377 | return XPRT_DIED; |
7b57bfe5 | 378 | if (!xdrrec_eof (&(cd->xdrs))) |
090ca000 UD |
379 | return XPRT_MOREREQS; |
380 | return XPRT_IDLE; | |
28f540f4 RM |
381 | } |
382 | ||
383 | static bool_t | |
090ca000 | 384 | svctcp_recv (SVCXPRT *xprt, struct rpc_msg *msg) |
28f540f4 | 385 | { |
090ca000 | 386 | struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1); |
e7fd8a39 UD |
387 | XDR *xdrs = &(cd->xdrs); |
388 | ||
389 | xdrs->x_op = XDR_DECODE; | |
7b57bfe5 UD |
390 | (void) xdrrec_skiprecord (xdrs); |
391 | if (xdr_callmsg (xdrs, msg)) | |
e7fd8a39 UD |
392 | { |
393 | cd->x_id = msg->rm_xid; | |
090ca000 | 394 | return TRUE; |
e7fd8a39 | 395 | } |
41aa20c2 | 396 | cd->strm_stat = XPRT_DIED; /* XXXX */ |
090ca000 | 397 | return FALSE; |
28f540f4 RM |
398 | } |
399 | ||
400 | static bool_t | |
090ca000 | 401 | svctcp_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr) |
28f540f4 | 402 | { |
090ca000 UD |
403 | return ((*xdr_args) (&(((struct tcp_conn *) |
404 | (xprt->xp_p1))->xdrs), args_ptr)); | |
28f540f4 RM |
405 | } |
406 | ||
407 | static bool_t | |
090ca000 | 408 | svctcp_freeargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr) |
28f540f4 | 409 | { |
090ca000 | 410 | XDR *xdrs = &(((struct tcp_conn *) (xprt->xp_p1))->xdrs); |
28f540f4 | 411 | |
e7fd8a39 UD |
412 | xdrs->x_op = XDR_FREE; |
413 | return ((*xdr_args) (xdrs, args_ptr)); | |
28f540f4 RM |
414 | } |
415 | ||
416 | static bool_t | |
090ca000 | 417 | svctcp_reply (SVCXPRT *xprt, struct rpc_msg *msg) |
28f540f4 | 418 | { |
090ca000 | 419 | struct tcp_conn *cd = (struct tcp_conn *) (xprt->xp_p1); |
e7fd8a39 UD |
420 | XDR *xdrs = &(cd->xdrs); |
421 | bool_t stat; | |
422 | ||
423 | xdrs->x_op = XDR_ENCODE; | |
424 | msg->rm_xid = cd->x_id; | |
7b57bfe5 UD |
425 | stat = xdr_replymsg (xdrs, msg); |
426 | (void) xdrrec_endofrecord (xdrs, TRUE); | |
090ca000 | 427 | return stat; |
28f540f4 | 428 | } |