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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637
|
/*
* svc_udp.c,
* Server side for UDP/IP based RPC. (Does some caching in the hopes of
* achieving execute-at-most-once semantics.)
*
* Copyright (C) 2012-2014 Free Software Foundation, Inc.
* This file is part of the GNU C Library.
*
* The GNU C Library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* The GNU C Library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with the GNU C Library; if not, see
* <http://www.gnu.org/licenses/>.
*
* Copyright (c) 2010, Oracle America, Inc.
*
* 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 the "Oracle America, 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.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <errno.h>
#include <libintl.h>
#ifdef IP_PKTINFO
#include <sys/uio.h>
#endif
#include <wchar.h>
#include <libio/iolibio.h>
#define rpc_buffer(xprt) ((xprt)->xp_p1)
#ifndef MAX
#define MAX(a, b) ((a > b) ? a : b)
#endif
static bool_t svcudp_recv (SVCXPRT *, struct rpc_msg *);
static bool_t svcudp_reply (SVCXPRT *, struct rpc_msg *);
static enum xprt_stat svcudp_stat (SVCXPRT *);
static bool_t svcudp_getargs (SVCXPRT *, xdrproc_t, caddr_t);
static bool_t svcudp_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
static void svcudp_destroy (SVCXPRT *);
static const struct xp_ops svcudp_op =
{
svcudp_recv,
svcudp_stat,
svcudp_getargs,
svcudp_reply,
svcudp_freeargs,
svcudp_destroy
};
static int cache_get (SVCXPRT *, struct rpc_msg *, char **replyp,
u_long *replylenp);
static void cache_set (SVCXPRT *xprt, u_long replylen);
/*
* kept in xprt->xp_p2
*/
struct svcudp_data
{
u_int su_iosz; /* byte size of send.recv buffer */
u_long su_xid; /* transaction id */
XDR su_xdrs; /* XDR handle */
char su_verfbody[MAX_AUTH_BYTES]; /* verifier body */
char *su_cache; /* cached data, NULL if no cache */
};
#define su_data(xprt) ((struct svcudp_data *)(xprt->xp_p2))
/*
* Usage:
* xprt = svcudp_create(sock);
*
* If sock<0 then a socket is created, else sock is used.
* If the socket, sock is not bound to a port then svcudp_create
* binds it to an arbitrary port. In any (successful) case,
* xprt->xp_sock is the registered socket number and xprt->xp_port is the
* associated port number.
* Once *xprt is initialized, it is registered as a transporter;
* see (svc.h, xprt_register).
* The routines returns NULL if a problem occurred.
*/
SVCXPRT *
svcudp_bufcreate (sock, sendsz, recvsz)
int sock;
u_int sendsz, recvsz;
{
bool_t madesock = FALSE;
SVCXPRT *xprt;
struct svcudp_data *su;
struct sockaddr_in addr;
socklen_t len = sizeof (struct sockaddr_in);
int pad;
void *buf;
if (sock == RPC_ANYSOCK)
{
if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
{
perror (_("svcudp_create: socket creation problem"));
return (SVCXPRT *) NULL;
}
madesock = TRUE;
}
__bzero ((char *) &addr, sizeof (addr));
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)
{
perror (_("svcudp_create - cannot getsockname"));
if (madesock)
(void) __close (sock);
return (SVCXPRT *) NULL;
}
xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
su = (struct svcudp_data *) mem_alloc (sizeof (*su));
buf = mem_alloc (((MAX (sendsz, recvsz) + 3) / 4) * 4);
if (xprt == NULL || su == NULL || buf == NULL)
{
(void) __fxprintf (NULL, "%s: %s",
"svcudp_create", _("out of memory\n"));
mem_free (xprt, sizeof (SVCXPRT));
mem_free (su, sizeof (*su));
mem_free (buf, ((MAX (sendsz, recvsz) + 3) / 4) * 4);
return NULL;
}
su->su_iosz = ((MAX (sendsz, recvsz) + 3) / 4) * 4;
rpc_buffer (xprt) = buf;
xdrmem_create (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz, XDR_DECODE);
su->su_cache = NULL;
xprt->xp_p2 = (caddr_t) su;
xprt->xp_verf.oa_base = su->su_verfbody;
xprt->xp_ops = &svcudp_op;
xprt->xp_port = ntohs (addr.sin_port);
xprt->xp_sock = sock;
#ifdef IP_PKTINFO
if ((sizeof (struct iovec) + sizeof (struct msghdr)
+ sizeof(struct cmsghdr) + sizeof (struct in_pktinfo))
> sizeof (xprt->xp_pad))
{
(void) __fxprintf (NULL,"%s", _("\
svcudp_create: xp_pad is too small for IP_PKTINFO\n"));
return NULL;
}
pad = 1;
if (__setsockopt (sock, SOL_IP, IP_PKTINFO, (void *) &pad,
sizeof (pad)) == 0)
/* Set the padding to all 1s. */
pad = 0xff;
else
#endif
/* Clear the padding. */
pad = 0;
memset (&xprt->xp_pad [0], pad, sizeof (xprt->xp_pad));
xprt_register (xprt);
return xprt;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (svcudp_bufcreate)
#else
libc_hidden_nolink_sunrpc (svcudp_bufcreate, GLIBC_2_0)
#endif
SVCXPRT *
svcudp_create (sock)
int sock;
{
return svcudp_bufcreate (sock, UDPMSGSIZE, UDPMSGSIZE);
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (svcudp_create)
#else
libc_hidden_nolink_sunrpc (svcudp_create, GLIBC_2_0)
#endif
static enum xprt_stat
svcudp_stat (xprt)
SVCXPRT *xprt;
{
return XPRT_IDLE;
}
static bool_t
svcudp_recv (xprt, msg)
SVCXPRT *xprt;
struct rpc_msg *msg;
{
struct svcudp_data *su = su_data (xprt);
XDR *xdrs = &(su->su_xdrs);
int rlen;
char *reply;
u_long replylen;
socklen_t len;
/* It is very tricky when you have IP aliases. We want to make sure
that we are sending the packet from the IP address where the
incoming packet is addressed to. H.J. */
#ifdef IP_PKTINFO
struct iovec *iovp;
struct msghdr *mesgp;
#endif
again:
/* FIXME -- should xp_addrlen be a size_t? */
len = (socklen_t) sizeof(struct sockaddr_in);
#ifdef IP_PKTINFO
iovp = (struct iovec *) &xprt->xp_pad [0];
mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
if (mesgp->msg_iovlen)
{
iovp->iov_base = rpc_buffer (xprt);
iovp->iov_len = su->su_iosz;
mesgp->msg_iov = iovp;
mesgp->msg_iovlen = 1;
mesgp->msg_name = &(xprt->xp_raddr);
mesgp->msg_namelen = len;
mesgp->msg_control = &xprt->xp_pad [sizeof (struct iovec)
+ sizeof (struct msghdr)];
mesgp->msg_controllen = sizeof(xprt->xp_pad)
- sizeof (struct iovec) - sizeof (struct msghdr);
rlen = __recvmsg (xprt->xp_sock, mesgp, 0);
if (rlen >= 0)
{
struct cmsghdr *cmsg;
len = mesgp->msg_namelen;
cmsg = CMSG_FIRSTHDR (mesgp);
if (cmsg == NULL
|| CMSG_NXTHDR (mesgp, cmsg) != NULL
|| cmsg->cmsg_level != SOL_IP
|| cmsg->cmsg_type != IP_PKTINFO
|| cmsg->cmsg_len < (sizeof (struct cmsghdr)
+ sizeof (struct in_pktinfo)))
{
/* Not a simple IP_PKTINFO, ignore it. */
mesgp->msg_control = NULL;
mesgp->msg_controllen = 0;
}
else
{
/* It was a simple IP_PKTIFO as we expected, discard the
interface field. */
struct in_pktinfo *pkti = (struct in_pktinfo *) CMSG_DATA (cmsg);
pkti->ipi_ifindex = 0;
}
}
}
else
#endif
rlen = __recvfrom (xprt->xp_sock, rpc_buffer (xprt),
(int) su->su_iosz, 0,
(struct sockaddr *) &(xprt->xp_raddr), &len);
xprt->xp_addrlen = len;
if (rlen == -1)
{
if (errno == EINTR)
goto again;
__svc_accept_failed ();
}
if (rlen < 16) /* < 4 32-bit ints? */
return FALSE;
xdrs->x_op = XDR_DECODE;
XDR_SETPOS (xdrs, 0);
if (!xdr_callmsg (xdrs, msg))
return FALSE;
su->su_xid = msg->rm_xid;
if (su->su_cache != NULL)
{
if (cache_get (xprt, msg, &reply, &replylen))
{
#ifdef IP_PKTINFO
if (mesgp->msg_iovlen)
{
iovp->iov_base = reply;
iovp->iov_len = replylen;
(void) __sendmsg (xprt->xp_sock, mesgp, 0);
}
else
#endif
(void) __sendto (xprt->xp_sock, reply, (int) replylen, 0,
(struct sockaddr *) &xprt->xp_raddr, len);
return TRUE;
}
}
return TRUE;
}
static bool_t
svcudp_reply (xprt, msg)
SVCXPRT *xprt;
struct rpc_msg *msg;
{
struct svcudp_data *su = su_data (xprt);
XDR *xdrs = &(su->su_xdrs);
int slen, sent;
bool_t stat = FALSE;
#ifdef IP_PKTINFO
struct iovec *iovp;
struct msghdr *mesgp;
#endif
xdrs->x_op = XDR_ENCODE;
XDR_SETPOS (xdrs, 0);
msg->rm_xid = su->su_xid;
if (xdr_replymsg (xdrs, msg))
{
slen = (int) XDR_GETPOS (xdrs);
#ifdef IP_PKTINFO
mesgp = (struct msghdr *) &xprt->xp_pad [sizeof (struct iovec)];
if (mesgp->msg_iovlen)
{
iovp = (struct iovec *) &xprt->xp_pad [0];
iovp->iov_base = rpc_buffer (xprt);
iovp->iov_len = slen;
sent = __sendmsg (xprt->xp_sock, mesgp, 0);
}
else
#endif
sent = __sendto (xprt->xp_sock, rpc_buffer (xprt), slen, 0,
(struct sockaddr *) &(xprt->xp_raddr),
xprt->xp_addrlen);
if (sent == slen)
{
stat = TRUE;
if (su->su_cache && slen >= 0)
{
cache_set (xprt, (u_long) slen);
}
}
}
return stat;
}
static bool_t
svcudp_getargs (xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
return (*xdr_args) (&(su_data (xprt)->su_xdrs), args_ptr);
}
static bool_t
svcudp_freeargs (xprt, xdr_args, args_ptr)
SVCXPRT *xprt;
xdrproc_t xdr_args;
caddr_t args_ptr;
{
XDR *xdrs = &(su_data (xprt)->su_xdrs);
xdrs->x_op = XDR_FREE;
return (*xdr_args) (xdrs, args_ptr);
}
static void
svcudp_destroy (xprt)
SVCXPRT *xprt;
{
struct svcudp_data *su = su_data (xprt);
xprt_unregister (xprt);
(void) __close (xprt->xp_sock);
XDR_DESTROY (&(su->su_xdrs));
mem_free (rpc_buffer (xprt), su->su_iosz);
mem_free ((caddr_t) su, sizeof (struct svcudp_data));
mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
}
/***********this could be a separate file*********************/
/*
* Fifo cache for udp server
* Copies pointers to reply buffers into fifo cache
* Buffers are sent again if retransmissions are detected.
*/
#define SPARSENESS 4 /* 75% sparse */
#define CACHE_PERROR(msg) \
(void) __fxprintf(NULL, "%s\n", msg)
#define ALLOC(type, size) \
(type *) mem_alloc((unsigned) (sizeof(type) * (size)))
#define CALLOC(type, size) \
(type *) calloc (sizeof (type), size)
/*
* An entry in the cache
*/
typedef struct cache_node *cache_ptr;
struct cache_node
{
/*
* Index into cache is xid, proc, vers, prog and address
*/
u_long cache_xid;
u_long cache_proc;
u_long cache_vers;
u_long cache_prog;
struct sockaddr_in cache_addr;
/*
* The cached reply and length
*/
char *cache_reply;
u_long cache_replylen;
/*
* Next node on the list, if there is a collision
*/
cache_ptr cache_next;
};
/*
* The entire cache
*/
struct udp_cache
{
u_long uc_size; /* size of cache */
cache_ptr *uc_entries; /* hash table of entries in cache */
cache_ptr *uc_fifo; /* fifo list of entries in cache */
u_long uc_nextvictim; /* points to next victim in fifo list */
u_long uc_prog; /* saved program number */
u_long uc_vers; /* saved version number */
u_long uc_proc; /* saved procedure number */
struct sockaddr_in uc_addr; /* saved caller's address */
};
/*
* the hashing function
*/
#define CACHE_LOC(transp, xid) \
(xid % (SPARSENESS*((struct udp_cache *) su_data(transp)->su_cache)->uc_size))
/*
* Enable use of the cache.
* Note: there is no disable.
*/
int
svcudp_enablecache (SVCXPRT *transp, u_long size)
{
struct svcudp_data *su = su_data (transp);
struct udp_cache *uc;
if (su->su_cache != NULL)
{
CACHE_PERROR (_("enablecache: cache already enabled"));
return 0;
}
uc = ALLOC (struct udp_cache, 1);
if (uc == NULL)
{
CACHE_PERROR (_("enablecache: could not allocate cache"));
return 0;
}
uc->uc_size = size;
uc->uc_nextvictim = 0;
uc->uc_entries = CALLOC (cache_ptr, size * SPARSENESS);
if (uc->uc_entries == NULL)
{
mem_free (uc, sizeof (struct udp_cache));
CACHE_PERROR (_("enablecache: could not allocate cache data"));
return 0;
}
uc->uc_fifo = CALLOC (cache_ptr, size);
if (uc->uc_fifo == NULL)
{
mem_free (uc->uc_entries, size * SPARSENESS);
mem_free (uc, sizeof (struct udp_cache));
CACHE_PERROR (_("enablecache: could not allocate cache fifo"));
return 0;
}
su->su_cache = (char *) uc;
return 1;
}
libc_hidden_nolink_sunrpc (svcudp_enablecache, GLIBC_2_0)
/*
* Set an entry in the cache
*/
static void
cache_set (SVCXPRT *xprt, u_long replylen)
{
cache_ptr victim;
cache_ptr *vicp;
struct svcudp_data *su = su_data (xprt);
struct udp_cache *uc = (struct udp_cache *) su->su_cache;
u_int loc;
char *newbuf;
/*
* Find space for the new entry, either by
* reusing an old entry, or by mallocing a new one
*/
victim = uc->uc_fifo[uc->uc_nextvictim];
if (victim != NULL)
{
loc = CACHE_LOC (xprt, victim->cache_xid);
for (vicp = &uc->uc_entries[loc];
*vicp != NULL && *vicp != victim;
vicp = &(*vicp)->cache_next)
;
if (*vicp == NULL)
{
CACHE_PERROR (_("cache_set: victim not found"));
return;
}
*vicp = victim->cache_next; /* remote from cache */
newbuf = victim->cache_reply;
}
else
{
victim = ALLOC (struct cache_node, 1);
if (victim == NULL)
{
CACHE_PERROR (_("cache_set: victim alloc failed"));
return;
}
newbuf = mem_alloc (su->su_iosz);
if (newbuf == NULL)
{
mem_free (victim, sizeof (struct cache_node));
CACHE_PERROR (_("cache_set: could not allocate new rpc_buffer"));
return;
}
}
/*
* Store it away
*/
victim->cache_replylen = replylen;
victim->cache_reply = rpc_buffer (xprt);
rpc_buffer (xprt) = newbuf;
xdrmem_create (&(su->su_xdrs), rpc_buffer (xprt), su->su_iosz, XDR_ENCODE);
victim->cache_xid = su->su_xid;
victim->cache_proc = uc->uc_proc;
victim->cache_vers = uc->uc_vers;
victim->cache_prog = uc->uc_prog;
victim->cache_addr = uc->uc_addr;
loc = CACHE_LOC (xprt, victim->cache_xid);
victim->cache_next = uc->uc_entries[loc];
uc->uc_entries[loc] = victim;
uc->uc_fifo[uc->uc_nextvictim++] = victim;
uc->uc_nextvictim %= uc->uc_size;
}
/*
* Try to get an entry from the cache
* return 1 if found, 0 if not found
*/
static int
cache_get (xprt, msg, replyp, replylenp)
SVCXPRT *xprt;
struct rpc_msg *msg;
char **replyp;
u_long *replylenp;
{
u_int loc;
cache_ptr ent;
struct svcudp_data *su = su_data (xprt);
struct udp_cache *uc = (struct udp_cache *) su->su_cache;
#define EQADDR(a1, a2) (memcmp((char*)&a1, (char*)&a2, sizeof(a1)) == 0)
loc = CACHE_LOC (xprt, su->su_xid);
for (ent = uc->uc_entries[loc]; ent != NULL; ent = ent->cache_next)
{
if (ent->cache_xid == su->su_xid &&
ent->cache_proc == uc->uc_proc &&
ent->cache_vers == uc->uc_vers &&
ent->cache_prog == uc->uc_prog &&
EQADDR (ent->cache_addr, uc->uc_addr))
{
*replyp = ent->cache_reply;
*replylenp = ent->cache_replylen;
return 1;
}
}
/*
* Failed to find entry
* Remember a few things so we can do a set later
*/
uc->uc_proc = msg->rm_call.cb_proc;
uc->uc_vers = msg->rm_call.cb_vers;
uc->uc_prog = msg->rm_call.cb_prog;
memcpy (&uc->uc_addr, &xprt->xp_raddr, sizeof (uc->uc_addr));
return 0;
}
|