1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
|
/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char *rcsid = "$OpenBSD: svc_tcp.c,v 1.18 1998/05/22 04:23:01 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */
/*
* svc_tcp.c, Server side for TCP/IP based RPC.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* Actually implements two flavors of transporter -
* a tcp rendezvouser (a listner and connection establisher)
* and a record/tcp stream.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <errno.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#if !defined(__linux__) && !defined(__GNU__)
#include <netinet/ip_var.h>
#endif
/*
* Ops vector for TCP/IP based rpc service handle
*/
static bool_t svctcp_recv();
static enum xprt_stat svctcp_stat();
static bool_t svctcp_getargs();
static bool_t svctcp_reply();
static bool_t svctcp_freeargs();
static void svctcp_destroy();
static struct xp_ops svctcp_op = {
svctcp_recv,
svctcp_stat,
svctcp_getargs,
svctcp_reply,
svctcp_freeargs,
svctcp_destroy
};
/*
* Ops vector for TCP/IP rendezvous handler
*/
static bool_t rendezvous_request();
static enum xprt_stat rendezvous_stat();
static struct xp_ops svctcp_rendezvous_op = {
rendezvous_request,
rendezvous_stat,
(bool_t (*)())abort,
(bool_t (*)())abort,
(bool_t (*)())abort,
svctcp_destroy
};
static int readtcp(), writetcp();
static SVCXPRT *makefd_xprt();
struct tcp_rendezvous { /* kept in xprt->xp_p1 */
u_int sendsize;
u_int recvsize;
};
struct tcp_conn { /* kept in xprt->xp_p1 */
enum xprt_stat strm_stat;
u_long x_id;
XDR xdrs;
char verf_body[MAX_AUTH_BYTES];
};
/*
* Usage:
* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
*
* Creates, registers, and returns a (rpc) tcp based transporter.
* Once *xprt is initialized, it is registered as a transporter
* see (svc.h, xprt_register). This routine returns
* a NULL if a problem occurred.
*
* If sock<0 then a socket is created, else sock is used.
* If the socket, sock is not bound to a port then svctcp_create
* binds it to an arbitrary port. The routine then starts a tcp
* listener on the socket's associated port. In any (successful) case,
* xprt->xp_sock is the registered socket number and xprt->xp_port is the
* associated port number.
*
* Since tcp streams do buffered io similar to stdio, the caller can specify
* how big the send and receive buffers are via the second and third parms;
* 0 => use the system default.
*/
SVCXPRT *
svctcp_create(sock, sendsize, recvsize)
register int sock;
u_int sendsize;
u_int recvsize;
{
bool_t madesock = FALSE;
register SVCXPRT *xprt;
register struct tcp_rendezvous *r;
struct sockaddr_in addr;
int len = sizeof(struct sockaddr_in);
if (sock == RPC_ANYSOCK) {
if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
authgss_perror(errno,
"svctcp_create: udp socket creation problem");
return ((SVCXPRT *)NULL);
}
madesock = TRUE;
}
memset(&addr, 0, sizeof (addr));
#ifndef __linux__
addr.sin_len = sizeof(struct sockaddr_in);
#endif
addr.sin_family = AF_INET;
if (bindresvport(sock, &addr)) {
addr.sin_port = 0;
(void)bind(sock, (struct sockaddr *)&addr, len);
}
if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) ||
(listen(sock, 2) != 0)) {
authgss_perror(errno,
"svctcp_create: cannot getsockname or listen");
if (madesock)
(void)close(sock);
return ((SVCXPRT *)NULL);
}
r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
if (r == NULL) {
authgss_log_err("svctcp_create: out of memory\n");
if (madesock)
(void)close(sock);
return (NULL);
}
r->sendsize = sendsize;
r->recvsize = recvsize;
xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
if (xprt == NULL) {
authgss_log_err("svctcp_create: out of memory\n");
if (madesock)
(void)close(sock);
free(r);
return (NULL);
}
xprt->xp_p2 = NULL;
xprt->xp_p1 = (caddr_t)r;
xprt->xp_auth = NULL;
xprt->xp_verf = _null_auth;
xprt->xp_ops = &svctcp_rendezvous_op;
xprt->xp_port = ntohs(addr.sin_port);
xprt->xp_sock = sock;
xprt_register(xprt);
return (xprt);
}
/*
* Like svtcp_create(), except the routine takes any *open* UNIX file
* descriptor as its first input.
*/
SVCXPRT *
svcfd_create(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
return (makefd_xprt(fd, sendsize, recvsize));
}
static SVCXPRT *
makefd_xprt(fd, sendsize, recvsize)
int fd;
u_int sendsize;
u_int recvsize;
{
register SVCXPRT *xprt;
register struct tcp_conn *cd;
xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
if (xprt == (SVCXPRT *)NULL) {
authgss_log_err("svc_tcp: makefd_xprt: out of memory\n");
goto done;
}
cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
if (cd == (struct tcp_conn *)NULL) {
authgss_log_err("svc_tcp: makefd_xprt: out of memory\n");
mem_free((char *) xprt, sizeof(SVCXPRT));
xprt = (SVCXPRT *)NULL;
goto done;
}
cd->strm_stat = XPRT_IDLE;
xdrrec_create(&(cd->xdrs), sendsize, recvsize,
(caddr_t)xprt, readtcp, writetcp);
xprt->xp_p2 = NULL;
xprt->xp_p1 = (caddr_t)cd;
xprt->xp_auth = NULL;
xprt->xp_verf.oa_base = cd->verf_body;
xprt->xp_addrlen = 0;
xprt->xp_ops = &svctcp_op; /* truely deals with calls */
xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
xprt->xp_sock = fd;
xprt_register(xprt);
done:
return (xprt);
}
static bool_t
rendezvous_request(xprt)
register SVCXPRT *xprt;
{
int sock;
struct tcp_rendezvous *r;
struct sockaddr_in addr;
int len;
r = (struct tcp_rendezvous *)xprt->xp_p1;
again:
len = sizeof(struct sockaddr_in);
if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
&len)) < 0) {
if (errno == EINTR)
goto again;
return (FALSE);
}
#ifdef IP_OPTIONS
{
#if defined(__linux__) || defined(__GNU__)
#define ipopt_list ip_opts
struct ip_opts opts;
#else
struct ipoption opts;
#endif
int optsize = sizeof(opts), i;
if (!getsockopt(sock, IPPROTO_IP, IP_OPTIONS, (char *)&opts,
&optsize) && optsize != 0) {
for (i = 0; (char *)&opts.ipopt_list[i] - (char *)&opts <
optsize; ) {
u_char c = (u_char)opts.ipopt_list[i];
if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
close(sock);
return (FALSE);
}
if (c == IPOPT_EOL)
break;
i += (c == IPOPT_NOP) ? 1 :
(u_char)opts.ipopt_list[i+1];
}
}
}
#endif
/*
* XXX careful for ftp bounce attacks. If discovered, close the
* socket and look for another connection.
*/
if (addr.sin_port == htons(20)) {
close(sock);
return (FALSE);
}
/*
* make a new transporter (re-uses xprt)
*/
xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
xprt->xp_raddr = addr;
xprt->xp_addrlen = len;
return (FALSE); /* there is never an rpc msg to be processed */
}
static enum xprt_stat
rendezvous_stat()
{
return (XPRT_IDLE);
}
static void
svctcp_destroy(xprt)
register SVCXPRT *xprt;
{
register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;
xprt_unregister(xprt);
if (xprt->xp_sock != -1)
(void)close(xprt->xp_sock);
xprt->xp_sock = -1;
if (xprt->xp_port != 0) {
/* a rendezvouser socket */
xprt->xp_port = 0;
} else {
/* an actual connection socket */
XDR_DESTROY(&(cd->xdrs));
}
if (xprt->xp_auth != NULL) {
SVCAUTH_DESTROY(xprt->xp_auth);
xprt->xp_auth = NULL;
}
mem_free((caddr_t)cd, sizeof(struct tcp_conn));
mem_free((caddr_t)xprt, sizeof(SVCXPRT));
}
/*
* All read operations timeout after 35 seconds.
* A timeout is fatal for the connection.
*/
static struct timeval wait_per_try = { 35, 0 };
/*
* reads data from the tcp conection.
* any error is fatal and the connection is closed.
* (And a read of zero bytes is a half closed stream => error.)
*/
static int
readtcp(xprt, buf, len)
register SVCXPRT *xprt;
caddr_t buf;
register int len;
{
register int sock = xprt->xp_sock;
struct timeval start, delta;
struct timeval tmp1, tmp2;
fd_set *fds = NULL;
int prevbytes = 0, bytes;
extern int __svc_fdsetsize;
extern fd_set *__svc_fdset;
delta = wait_per_try;
gettimeofday(&start, NULL);
do {
bytes = howmany(__svc_fdsetsize, NFDBITS) * sizeof(fd_mask);
if (bytes != prevbytes) {
if (fds)
free(fds);
fds = (fd_set *)malloc(bytes);
prevbytes = bytes;
}
if (fds == NULL)
goto fatal_err;
memcpy(fds, __svc_fdset, bytes);
FD_SET(sock, fds);
switch (select(svc_maxfd+1, fds, NULL, NULL, &delta)) {
case -1:
if (errno != EINTR)
goto fatal_err;
gettimeofday(&tmp1, NULL);
timersub(&tmp1, &start, &tmp2);
timersub(&wait_per_try, &tmp2, &tmp1);
if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
goto fatal_err;
delta = tmp1;
continue;
case 0:
goto fatal_err;
default:
if (!FD_ISSET(sock, fds)) {
svc_getreqset2(fds, svc_maxfd+1);
gettimeofday(&tmp1, NULL);
timersub(&tmp1, &start, &tmp2);
timersub(&wait_per_try, &tmp2, &tmp1);
if (tmp1.tv_sec < 0 || !timerisset(&tmp1))
goto fatal_err;
delta = tmp1;
continue;
}
}
} while (!FD_ISSET(sock, fds));
if ((len = read(sock, buf, len)) > 0) {
if (fds)
free(fds);
return (len);
}
fatal_err:
((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
if (fds)
free(fds);
return (-1);
}
/*
* writes data to the tcp connection.
* Any error is fatal and the connection is closed.
*/
static int
writetcp(xprt, buf, len)
register SVCXPRT *xprt;
caddr_t buf;
int len;
{
register int i, cnt;
for (cnt = len; cnt > 0; cnt -= i, buf += i) {
if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
XPRT_DIED;
return (-1);
}
}
return (len);
}
static enum xprt_stat
svctcp_stat(xprt)
SVCXPRT *xprt;
{
register struct tcp_conn *cd =
(struct tcp_conn *)(xprt->xp_p1);
if (cd->strm_stat == XPRT_DIED)
return (XPRT_DIED);
if (! xdrrec_eof(&(cd->xdrs)))
return (XPRT_MOREREQS);
return (XPRT_IDLE);
}
static bool_t
svctcp_recv(xprt, msg)
SVCXPRT *xprt;
register struct rpc_msg *msg;
{
register struct tcp_conn *cd =
(struct tcp_conn *)(xprt->xp_p1);
register XDR *xdrs = &(cd->xdrs);
xdrs->x_op = XDR_DECODE;
(void)xdrrec_skiprecord(xdrs);
if (xdr_callmsg(xdrs, msg)) {
cd->x_id = msg->rm_xid;
return (TRUE);
}
cd->strm_stat = XPRT_DIED; /* XXX */
return (FALSE);
}
static bool_t
svctcp_getargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
return (SVCAUTH_UNWRAP(xprt->xp_auth,
&(((struct tcp_conn *)(xprt->xp_p1))->xdrs),
xdr_args, args_ptr));
}
static bool_t
svctcp_freeargs(xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
register XDR *xdrs =
&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
xdrs->x_op = XDR_FREE;
return ((*xdr_args)(xdrs, args_ptr));
}
static bool_t
svctcp_reply(xprt, msg)
SVCXPRT *xprt;
register struct rpc_msg *msg;
{
register struct tcp_conn *cd =
(struct tcp_conn *)(xprt->xp_p1);
register XDR *xdrs = &(cd->xdrs);
xdrproc_t xdr_proc;
caddr_t xdr_where;
xdrs->x_op = XDR_ENCODE;
msg->rm_xid = cd->x_id;
if (msg->rm_reply.rp_stat == MSG_ACCEPTED &&
msg->rm_reply.rp_acpt.ar_stat == SUCCESS) {
xdr_proc = msg->acpted_rply.ar_results.proc;
xdr_where = msg->acpted_rply.ar_results.where;
msg->acpted_rply.ar_results.proc = (xdrproc_t)xdr_void;
msg->acpted_rply.ar_results.where = NULL;
if (!xdr_replymsg(xdrs, msg) ||
!SVCAUTH_WRAP(xprt->xp_auth, xdrs, xdr_proc, xdr_where))
return (FALSE);
}
else if (!xdr_replymsg(xdrs, msg)) {
return (FALSE);
}
(void)xdrrec_endofrecord(xdrs, TRUE);
return (TRUE);
}
|