1 /* $NetBSD: rpcb_svc_com.c,v 1.28 2024/02/09 22:08:38 andvar Exp $ */ 2 /* $FreeBSD: head/usr.sbin/rpcbind/rpcb_svc_com.c 301770 2016-06-09 22:25:00Z pfg $ */ 3 4 /*- 5 * Copyright (c) 2009, Sun Microsystems, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * - Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * - Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * - Neither the name of Sun Microsystems, Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 23 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /* 32 * Copyright (c) 1986 - 1991 by Sun Microsystems, Inc. 33 */ 34 35 /* #ident "@(#)rpcb_svc_com.c 1.18 94/05/02 SMI" */ 36 37 /* 38 * rpcb_svc_com.c 39 * The commom server procedure for the rpcbind. 40 */ 41 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <sys/param.h> 45 #include <sys/socket.h> 46 #include <rpc/rpc.h> 47 #include <rpc/rpcb_prot.h> 48 #include <rpc/rpc_com.h> 49 #include <assert.h> 50 #include <netconfig.h> 51 #include <errno.h> 52 #include <syslog.h> 53 #include <unistd.h> 54 #include <stdio.h> 55 #include <poll.h> 56 #ifdef PORTMAP 57 #include <netinet/in.h> 58 #include <rpc/pmap_prot.h> 59 #endif /* PORTMAP */ 60 #include <string.h> 61 #include <stdlib.h> 62 63 #ifdef RPCBIND_RUMP 64 #include <rump/rump.h> 65 #include <rump/rump_syscallshotgun.h> 66 #include <rump/rump_syscalls.h> 67 #endif 68 69 #include "svc_dg.h" 70 #include "rpcbind.h" 71 #ifdef RPCBIND_RUMP 72 #include "svc_fdset.h" 73 #endif 74 75 #define RPC_BUF_MAX 65536 /* can be raised if required */ 76 77 static char nullstring[] = ""; 78 static int rpcb_rmtcalls; 79 80 struct rmtcallfd_list { 81 int fd; 82 SVCXPRT *xprt; 83 char *netid; 84 struct rmtcallfd_list *next; 85 }; 86 87 #define NFORWARD 64 88 #define MAXTIME_OFF 300 /* 5 minutes */ 89 90 struct finfo { 91 int flag; 92 #define FINFO_ACTIVE 0x1 93 u_int32_t caller_xid; 94 struct netbuf *caller_addr; 95 u_int32_t forward_xid; 96 int forward_fd; 97 char *uaddr; 98 rpcproc_t reply_type; 99 rpcvers_t versnum; 100 time_t time; 101 }; 102 static struct finfo FINFO[NFORWARD]; 103 104 105 static bool_t xdr_encap_parms(XDR *, struct encap_parms *); 106 static bool_t xdr_rmtcall_args(XDR *, struct r_rmtcall_args *); 107 static bool_t xdr_rmtcall_result(XDR *, struct r_rmtcall_args *); 108 static bool_t xdr_opaque_parms(XDR *, struct r_rmtcall_args *); 109 static int find_rmtcallfd_by_netid(char *); 110 static SVCXPRT *find_rmtcallxprt_by_fd(int); 111 static int forward_register(u_int32_t, struct netbuf *, int, char *, 112 rpcproc_t, rpcvers_t, u_int32_t *); 113 static struct finfo *forward_find(u_int32_t); 114 static int free_slot_by_xid(u_int32_t); 115 static int free_slot_by_index(int); 116 static int netbufcmp(struct netbuf *, struct netbuf *); 117 static struct netbuf *netbufdup(struct netbuf *); 118 static void netbuffree(struct netbuf *); 119 static int check_rmtcalls(struct pollfd *, int); 120 static void xprt_set_caller(SVCXPRT *, struct finfo *); 121 static void send_svcsyserr(SVCXPRT *, struct finfo *); 122 static void handle_reply(int, SVCXPRT *); 123 static void find_versions(rpcprog_t, char *, rpcvers_t *, rpcvers_t *); 124 static rpcblist_ptr find_service(rpcprog_t, rpcvers_t, char *); 125 static char *getowner(SVCXPRT *, char *, size_t); 126 static int add_pmaplist(RPCB *); 127 static int del_pmaplist(RPCB *); 128 129 /* 130 * Set a mapping of program, version, netid 131 */ 132 /* ARGSUSED */ 133 void * 134 rpcbproc_set_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 135 rpcvers_t rpcbversnum) 136 { 137 RPCB *regp = arg; 138 static bool_t ans; 139 char owner[64]; 140 141 #ifdef RPCBIND_DEBUG 142 if (debugging) 143 fprintf(stderr, "%s: RPCB_SET request for (%lu, %lu, %s, %s): ", 144 __func__, (unsigned long)regp->r_prog, 145 (unsigned long)regp->r_vers, regp->r_netid, regp->r_addr); 146 #endif 147 ans = map_set(regp, getowner(transp, owner, sizeof owner)); 148 #ifdef RPCBIND_DEBUG 149 if (debugging) 150 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 151 #endif 152 /* XXX: should have used some defined constant here */ 153 rpcbs_set(rpcbversnum - 2, ans); 154 return (void *)&ans; 155 } 156 157 bool_t 158 map_set(RPCB *regp, char *owner) 159 { 160 RPCB reg, *a; 161 rpcblist_ptr rbl, fnd; 162 163 reg = *regp; 164 /* 165 * check to see if already used 166 * find_service returns a hit even if 167 * the versions don't match, so check for it 168 */ 169 fnd = find_service(reg.r_prog, reg.r_vers, reg.r_netid); 170 if (fnd && (fnd->rpcb_map.r_vers == reg.r_vers)) { 171 if (!strcmp(fnd->rpcb_map.r_addr, reg.r_addr)) 172 /* 173 * if these match then it is already 174 * registered so just say "OK". 175 */ 176 return (TRUE); 177 else 178 return (FALSE); 179 } 180 /* 181 * add to the end of the list 182 */ 183 rbl = malloc(sizeof(*rbl)); 184 if (rbl == NULL) 185 return (FALSE); 186 a = &(rbl->rpcb_map); 187 a->r_prog = reg.r_prog; 188 a->r_vers = reg.r_vers; 189 a->r_netid = strdup(reg.r_netid); 190 a->r_addr = strdup(reg.r_addr); 191 a->r_owner = strdup(owner); 192 if (!a->r_addr || !a->r_netid || !a->r_owner) { 193 if (a->r_netid) 194 free(a->r_netid); 195 if (a->r_addr) 196 free(a->r_addr); 197 if (a->r_owner) 198 free(a->r_owner); 199 free(rbl); 200 return (FALSE); 201 } 202 rbl->rpcb_next = NULL; 203 if (list_rbl == NULL) { 204 list_rbl = rbl; 205 } else { 206 for (fnd = list_rbl; fnd->rpcb_next; 207 fnd = fnd->rpcb_next) 208 ; 209 fnd->rpcb_next = rbl; 210 } 211 #ifdef PORTMAP 212 (void) add_pmaplist(regp); 213 #endif 214 return (TRUE); 215 } 216 217 /* 218 * Unset a mapping of program, version, netid 219 */ 220 /* ARGSUSED */ 221 void * 222 rpcbproc_unset_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 223 rpcvers_t rpcbversnum) 224 { 225 RPCB *regp = arg; 226 static bool_t ans; 227 char owner[64]; 228 229 #ifdef RPCBIND_DEBUG 230 if (debugging) 231 fprintf(stderr, "%s: RPCB_UNSET request for (%lu, %lu, %s): ", 232 __func__, (unsigned long)regp->r_prog, 233 (unsigned long)regp->r_vers, regp->r_netid); 234 #endif 235 ans = map_unset(regp, getowner(transp, owner, sizeof owner)); 236 #ifdef RPCBIND_DEBUG 237 if (debugging) 238 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 239 #endif 240 /* XXX: should have used some defined constant here */ 241 rpcbs_unset(rpcbversnum - 2, ans); 242 return (void *)&ans; 243 } 244 245 bool_t 246 map_unset(RPCB *regp, const char *owner) 247 { 248 int ans = 0; 249 rpcblist_ptr rbl, prev, tmp; 250 251 if (owner == NULL) 252 return (0); 253 254 for (prev = NULL, rbl = list_rbl; rbl; /* cstyle */) { 255 if ((rbl->rpcb_map.r_prog != regp->r_prog) || 256 (rbl->rpcb_map.r_vers != regp->r_vers) || 257 (regp->r_netid[0] && strcasecmp(regp->r_netid, 258 rbl->rpcb_map.r_netid))) { 259 /* both rbl & prev move forwards */ 260 prev = rbl; 261 rbl = rbl->rpcb_next; 262 continue; 263 } 264 /* 265 * Check whether appropriate uid. Unset only 266 * if superuser or the owner itself. 267 */ 268 if (strcmp(owner, rpcbind_superuser) && 269 strcmp(rbl->rpcb_map.r_owner, owner)) 270 return (0); 271 /* found it; rbl moves forward, prev stays */ 272 ans = 1; 273 tmp = rbl; 274 rbl = rbl->rpcb_next; 275 if (prev == NULL) 276 list_rbl = rbl; 277 else 278 prev->rpcb_next = rbl; 279 free(tmp->rpcb_map.r_addr); 280 free(tmp->rpcb_map.r_netid); 281 free(tmp->rpcb_map.r_owner); 282 free(tmp); 283 } 284 #ifdef PORTMAP 285 if (ans) 286 (void) del_pmaplist(regp); 287 #endif 288 /* 289 * We return 1 either when the entry was not there or it 290 * was able to unset it. It can come to this point only if 291 * at least one of the conditions is true. 292 */ 293 return (1); 294 } 295 296 void 297 delete_prog(rpcprog_t prog) 298 { 299 RPCB reg; 300 rpcblist_ptr rbl; 301 302 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 303 if ((rbl->rpcb_map.r_prog != prog)) 304 continue; 305 if (is_bound(rbl->rpcb_map.r_netid, rbl->rpcb_map.r_addr)) 306 continue; 307 reg.r_prog = rbl->rpcb_map.r_prog; 308 reg.r_vers = rbl->rpcb_map.r_vers; 309 reg.r_netid = strdup(rbl->rpcb_map.r_netid); 310 if (reg.r_netid == NULL) 311 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 312 else { 313 (void)map_unset(®, rpcbind_superuser); 314 free(reg.r_netid); 315 } 316 } 317 } 318 319 void * 320 rpcbproc_getaddr_com(RPCB *regp, struct svc_req *rqstp __unused, 321 SVCXPRT *transp, rpcvers_t rpcbversnum, rpcvers_t verstype) 322 { 323 static char *uaddr; 324 char *saddr = NULL; 325 rpcblist_ptr fnd; 326 327 if (uaddr != NULL && uaddr != nullstring) { 328 free(uaddr); 329 uaddr = NULL; 330 } 331 fnd = find_service(regp->r_prog, regp->r_vers, transp->xp_netid); 332 if (fnd && ((verstype == RPCB_ALLVERS) || 333 (regp->r_vers == fnd->rpcb_map.r_vers))) { 334 if (*(regp->r_addr) != '\0') { /* may contain a hint about */ 335 saddr = regp->r_addr; /* the interface that we */ 336 } /* should use */ 337 if (!(uaddr = mergeaddr(transp, transp->xp_netid, 338 fnd->rpcb_map.r_addr, saddr))) { 339 /* Try whatever we have */ 340 uaddr = strdup(fnd->rpcb_map.r_addr); 341 } else if (!uaddr[0]) { 342 /* 343 * The server died. Unset all versions of this prog. 344 */ 345 delete_prog(regp->r_prog); 346 uaddr = nullstring; 347 } 348 } else { 349 uaddr = nullstring; 350 } 351 #ifdef RPCBIND_DEBUG 352 if (debugging) 353 fprintf(stderr, "%s: %s\n", __func__, uaddr); 354 #endif 355 /* XXX: should have used some defined constant here */ 356 rpcbs_getaddr(rpcbversnum - 2, regp->r_prog, regp->r_vers, 357 transp->xp_netid, uaddr); 358 return (void *)&uaddr; 359 } 360 361 /* ARGSUSED */ 362 void * 363 rpcbproc_gettime_com(void *arg __unused, struct svc_req *rqstp __unused, 364 SVCXPRT *transp __unused, rpcvers_t rpcbversnum __unused) 365 { 366 static time_t curtime; 367 368 (void) time(&curtime); 369 return &curtime; 370 } 371 372 /* 373 * Convert uaddr to taddr. Should be used only by 374 * local servers/clients. (kernel level stuff only) 375 */ 376 /* ARGSUSED */ 377 void * 378 rpcbproc_uaddr2taddr_com(void *arg, struct svc_req *rqstp __unused, 379 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 380 { 381 char **uaddrp = arg; 382 struct netconfig *nconf; 383 static struct netbuf nbuf; 384 static struct netbuf *taddr; 385 386 if (taddr) { 387 free(taddr->buf); 388 free(taddr); 389 taddr = NULL; 390 } 391 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 392 ((taddr = uaddr2taddr(nconf, *uaddrp)) == NULL)) { 393 (void) memset(&nbuf, 0, sizeof (struct netbuf)); 394 return &nbuf; 395 } 396 return taddr; 397 } 398 399 /* 400 * Convert taddr to uaddr. Should be used only by 401 * local servers/clients. (kernel level stuff only) 402 */ 403 /* ARGSUSED */ 404 void * 405 rpcbproc_taddr2uaddr_com(void *arg, struct svc_req *rqstp __unused, 406 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 407 { 408 struct netbuf *taddr = arg; 409 static char *uaddr; 410 struct netconfig *nconf; 411 412 #ifdef CHEW_FDS 413 int fd; 414 415 if ((fd = open("/dev/null", O_RDONLY)) == -1) { 416 uaddr = strerror(errno); 417 return (&uaddr); 418 } 419 #endif /* CHEW_FDS */ 420 if (uaddr != NULL && uaddr != nullstring) { 421 free(uaddr); 422 uaddr = NULL; 423 } 424 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 425 ((uaddr = taddr2uaddr(nconf, taddr)) == NULL)) { 426 uaddr = nullstring; 427 } 428 return (void *)&uaddr; 429 } 430 431 432 static bool_t 433 xdr_encap_parms(XDR *xdrs, struct encap_parms *epp) 434 { 435 return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), 436 RPC_MAXDATASIZE)); 437 } 438 439 /* 440 * XDR remote call arguments. It ignores the address part. 441 * written for XDR_DECODE direction only 442 */ 443 static bool_t 444 xdr_rmtcall_args(XDR *xdrs, struct r_rmtcall_args *cap) 445 { 446 /* does not get the address or the arguments */ 447 if (xdr_rpcprog(xdrs, &(cap->rmt_prog)) && 448 xdr_rpcvers(xdrs, &(cap->rmt_vers)) && 449 xdr_rpcproc(xdrs, &(cap->rmt_proc))) { 450 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 451 } 452 return (FALSE); 453 } 454 455 /* 456 * XDR remote call results along with the address. Ignore 457 * program number, version number and proc number. 458 * Written for XDR_ENCODE direction only. 459 */ 460 static bool_t 461 xdr_rmtcall_result(XDR *xdrs, struct r_rmtcall_args *cap) 462 { 463 bool_t result; 464 465 #ifdef PORTMAP 466 if (cap->rmt_localvers == PMAPVERS) { 467 int h1, h2, h3, h4, p1, p2; 468 u_long port; 469 470 /* interpret the universal address for TCP/IP */ 471 if (sscanf(cap->rmt_uaddr, "%d.%d.%d.%d.%d.%d", 472 &h1, &h2, &h3, &h4, &p1, &p2) != 6) 473 return (FALSE); 474 port = ((p1 & 0xff) << 8) + (p2 & 0xff); 475 result = xdr_u_long(xdrs, &port); 476 } else 477 #endif 478 if ((cap->rmt_localvers == RPCBVERS) || 479 (cap->rmt_localvers == RPCBVERS4)) { 480 result = xdr_wrapstring(xdrs, &(cap->rmt_uaddr)); 481 } else { 482 return (FALSE); 483 } 484 if (result == TRUE) 485 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 486 return (FALSE); 487 } 488 489 /* 490 * only worries about the struct encap_parms part of struct r_rmtcall_args. 491 * The arglen must already be set!! 492 */ 493 static bool_t 494 xdr_opaque_parms(XDR *xdrs, struct r_rmtcall_args *cap) 495 { 496 return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen)); 497 } 498 499 static struct rmtcallfd_list *rmthead; 500 static struct rmtcallfd_list *rmttail; 501 502 int 503 create_rmtcall_fd(struct netconfig *nconf) 504 { 505 int fd; 506 struct rmtcallfd_list *rmt; 507 SVCXPRT *xprt; 508 509 if ((fd = __rpc_nconf2fd(nconf)) == -1) { 510 if (debugging) 511 fprintf(stderr, "%s: couldn't open \"%s\" (%s)\n", 512 __func__, nconf->nc_device, strerror(errno)); 513 return (-1); 514 } 515 xprt = svc_tli_create(fd, 0, NULL, 0, 0); 516 if (xprt == NULL) { 517 if (debugging) 518 fprintf(stderr, 519 "%s: svc_tli_create failed\n", __func__); 520 return (-1); 521 } 522 rmt = malloc(sizeof(*rmt)); 523 if (rmt == NULL) { 524 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 525 return (-1); 526 } 527 rmt->xprt = xprt; 528 rmt->netid = strdup(nconf->nc_netid); 529 xprt->xp_netid = rmt->netid; 530 rmt->fd = fd; 531 rmt->next = NULL; 532 if (rmthead == NULL) { 533 rmthead = rmt; 534 rmttail = rmt; 535 } else { 536 rmttail->next = rmt; 537 rmttail = rmt; 538 } 539 svc_fdset_set(fd); 540 return (fd); 541 } 542 543 static int 544 find_rmtcallfd_by_netid(char *netid) 545 { 546 struct rmtcallfd_list *rmt; 547 548 for (rmt = rmthead; rmt != NULL; rmt = rmt->next) { 549 if (strcmp(netid, rmt->netid) == 0) { 550 return (rmt->fd); 551 } 552 } 553 return (-1); 554 } 555 556 static SVCXPRT * 557 find_rmtcallxprt_by_fd(int fd) 558 { 559 struct rmtcallfd_list *rmt; 560 561 for (rmt = rmthead; rmt != NULL; rmt = rmt->next) { 562 if (fd == rmt->fd) { 563 return (rmt->xprt); 564 } 565 } 566 return (NULL); 567 } 568 569 570 /* 571 * Call a remote procedure service. This procedure is very quiet when things 572 * go wrong. The proc is written to support broadcast rpc. In the broadcast 573 * case, a machine should shut-up instead of complain, lest the requestor be 574 * overrun with complaints at the expense of not hearing a valid reply. 575 * When receiving a request and verifying that the service exists, we 576 * 577 * receive the request 578 * 579 * open a new TLI endpoint on the same transport on which we received 580 * the original request 581 * 582 * remember the original request's XID (which requires knowing the format 583 * of the svc_dg_data structure) 584 * 585 * forward the request, with a new XID, to the requested service, 586 * remembering the XID used to send this request (for later use in 587 * reassociating the answer with the original request), the requestor's 588 * address, the file descriptor on which the forwarded request is 589 * made and the service's address. 590 * 591 * mark the file descriptor on which we anticipate receiving a reply from 592 * the service and one to select for in our private svc_run procedure 593 * 594 * At some time in the future, a reply will be received from the service to 595 * which we forwarded the request. At that time, we detect that the socket 596 * used was for forwarding (by looking through the finfo structures to see 597 * whether the fd corresponds to one of those) and call handle_reply() to 598 * 599 * receive the reply 600 * 601 * bundle the reply, along with the service's universal address 602 * 603 * create a SVCXPRT structure and use a version of svc_sendreply 604 * that allows us to specify the reply XID and destination, send the reply 605 * to the original requestor. 606 */ 607 608 void 609 rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp, 610 rpcproc_t reply_type, rpcvers_t versnum) 611 { 612 rpcblist_ptr rbl; 613 struct netconfig *nconf; 614 struct netbuf *caller; 615 struct r_rmtcall_args a; 616 char *buf_alloc = NULL, *outbufp; 617 char *outbuf_alloc = NULL; 618 char buf[RPC_BUF_MAX], outbuf[RPC_BUF_MAX]; 619 struct netbuf *na = NULL; 620 struct rpc_msg call_msg; 621 int outlen; 622 u_int sendsz; 623 XDR outxdr; 624 AUTH *auth; 625 int fd = -1; 626 char *uaddr, *m_uaddr = NULL, *local_uaddr = NULL; 627 u_int32_t *xidp; 628 struct __rpc_sockinfo si; 629 struct sockaddr *localsa; 630 struct netbuf tbuf; 631 632 if (!__rpc_fd2sockinfo(transp->xp_fd, &si)) { 633 if (reply_type == RPCBPROC_INDIRECT) 634 svcerr_systemerr(transp); 635 return; 636 } 637 if (si.si_socktype != SOCK_DGRAM) 638 return; /* Only datagram type accepted */ 639 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, UDPMSGSIZE); 640 if (sendsz == 0) { /* data transfer not supported */ 641 if (reply_type == RPCBPROC_INDIRECT) 642 svcerr_systemerr(transp); 643 return; 644 } 645 /* 646 * Should be multiple of 4 for XDR. 647 */ 648 sendsz = roundup(sendsz, 4); 649 if (sendsz > RPC_BUF_MAX) { 650 #ifdef notyet 651 buf_alloc = alloca(sendsz); /* not in IDR2? */ 652 #else 653 buf_alloc = malloc(sendsz); 654 #endif /* notyet */ 655 if (buf_alloc == NULL) { 656 if (debugging) 657 fprintf(stderr, "%s: No Memory!\n", __func__); 658 if (reply_type == RPCBPROC_INDIRECT) 659 svcerr_systemerr(transp); 660 return; 661 } 662 a.rmt_args.args = buf_alloc; 663 } else { 664 a.rmt_args.args = buf; 665 } 666 667 call_msg.rm_xid = 0; /* For error checking purposes */ 668 if (!svc_getargs(transp, (xdrproc_t) xdr_rmtcall_args, (char *) &a)) { 669 if (reply_type == RPCBPROC_INDIRECT) 670 svcerr_decode(transp); 671 if (debugging) 672 fprintf(stderr, "%s: svc_getargs failed\n", __func__); 673 goto error; 674 } 675 676 if (!check_callit(transp, &a, versnum)) { 677 svcerr_weakauth(transp); 678 goto error; 679 } 680 681 caller = svc_getrpccaller(transp); 682 #ifdef RPCBIND_DEBUG 683 if (debugging) { 684 uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid), caller); 685 fprintf(stderr, 686 "%s: %s %s req for (%lu, %lu, %lu, %s) from %s: ", 687 __func__, versnum == PMAPVERS ? "pmap_rmtcall" : 688 versnum == RPCBVERS ? "rpcb_rmtcall" : 689 versnum == RPCBVERS4 ? "rpcb_indirect" : 690 rpcbind_unknown, 691 reply_type == RPCBPROC_INDIRECT ? "indirect" : "callit", 692 (unsigned long)a.rmt_prog, (unsigned long)a.rmt_vers, 693 (unsigned long)a.rmt_proc, transp->xp_netid, 694 uaddr ? uaddr : rpcbind_unknown); 695 if (uaddr) 696 free(uaddr); 697 } 698 #endif 699 700 rbl = find_service(a.rmt_prog, a.rmt_vers, transp->xp_netid); 701 702 rpcbs_rmtcall(versnum - 2, reply_type, a.rmt_prog, a.rmt_vers, 703 a.rmt_proc, transp->xp_netid, rbl); 704 705 if (rbl == NULL) { 706 #ifdef RPCBIND_DEBUG 707 if (debugging) 708 fprintf(stderr, "not found\n"); 709 #endif 710 if (reply_type == RPCBPROC_INDIRECT) 711 svcerr_noprog(transp); 712 goto error; 713 } 714 if (rbl->rpcb_map.r_vers != a.rmt_vers) { 715 if (reply_type == RPCBPROC_INDIRECT) { 716 rpcvers_t vers_low, vers_high; 717 718 find_versions(a.rmt_prog, transp->xp_netid, 719 &vers_low, &vers_high); 720 svcerr_progvers(transp, vers_low, vers_high); 721 } 722 goto error; 723 } 724 725 #ifdef RPCBIND_DEBUG 726 if (debugging) 727 fprintf(stderr, "found at uaddr %s\n", rbl->rpcb_map.r_addr); 728 #endif 729 /* 730 * Check whether this entry is valid and a server is present 731 * Mergeaddr() returns NULL if no such entry is present, and 732 * returns "" if the entry was present but the server is not 733 * present (i.e., it crashed). 734 */ 735 if (reply_type == RPCBPROC_INDIRECT) { 736 uaddr = mergeaddr(transp, transp->xp_netid, 737 rbl->rpcb_map.r_addr, NULL); 738 if (uaddr == NULL || uaddr[0] == '\0') { 739 svcerr_noprog(transp); 740 free(uaddr); 741 goto error; 742 } 743 free(uaddr); 744 } 745 nconf = rpcbind_get_conf(transp->xp_netid); 746 if (nconf == NULL) { 747 if (reply_type == RPCBPROC_INDIRECT) 748 svcerr_systemerr(transp); 749 if (debugging) 750 fprintf(stderr, "%s: rpcbind_get_conf failed\n", 751 __func__); 752 goto error; 753 } 754 localsa = local_sa(((struct sockaddr *)caller->buf)->sa_family); 755 if (localsa == NULL) { 756 if (debugging) 757 fprintf(stderr, "%s: no local address\n", __func__); 758 goto error; 759 } 760 tbuf.len = tbuf.maxlen = localsa->sa_len; 761 tbuf.buf = localsa; 762 local_uaddr = 763 addrmerge(&tbuf, rbl->rpcb_map.r_addr, NULL, nconf->nc_netid); 764 m_uaddr = addrmerge(caller, rbl->rpcb_map.r_addr, NULL, 765 nconf->nc_netid); 766 #ifdef RPCBIND_DEBUG 767 if (debugging) 768 fprintf(stderr, "%s: merged uaddr %s\n", __func__, m_uaddr); 769 #endif 770 if ((fd = find_rmtcallfd_by_netid(nconf->nc_netid)) == -1) { 771 if (reply_type == RPCBPROC_INDIRECT) 772 svcerr_systemerr(transp); 773 goto error; 774 } 775 xidp = __rpcb_get_dg_xidp(transp); 776 switch (forward_register(*xidp, caller, fd, m_uaddr, reply_type, 777 versnum, &call_msg.rm_xid)) { 778 case 1: 779 /* Success; forward_register() will free m_uaddr for us. */ 780 m_uaddr = NULL; 781 break; 782 case 0: 783 /* 784 * A duplicate request for the slow server. Let's not 785 * beat on it any more. 786 */ 787 if (debugging) 788 fprintf(stderr, "%s: duplicate request\n", __func__); 789 goto error; 790 case -1: 791 /* forward_register failed. Perhaps no memory. */ 792 if (debugging) 793 fprintf(stderr, "%s: forward_register failed\n", 794 __func__); 795 goto error; 796 } 797 798 #ifdef DEBUG_RMTCALL 799 if (debugging) 800 fprintf(stderr, "%s: original XID %x, new XID %x\n", __func__, 801 *xidp, call_msg.rm_xid); 802 #endif 803 call_msg.rm_direction = CALL; 804 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 805 call_msg.rm_call.cb_prog = a.rmt_prog; 806 call_msg.rm_call.cb_vers = a.rmt_vers; 807 if (sendsz > RPC_BUF_MAX) { 808 #ifdef notyet 809 outbuf_alloc = alloca(sendsz); /* not in IDR2? */ 810 #else 811 outbuf_alloc = malloc(sendsz); 812 #endif /* notyet */ 813 if (outbuf_alloc == NULL) { 814 if (reply_type == RPCBPROC_INDIRECT) 815 svcerr_systemerr(transp); 816 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 817 goto error; 818 } 819 xdrmem_create(&outxdr, outbuf_alloc, sendsz, XDR_ENCODE); 820 } else { 821 xdrmem_create(&outxdr, outbuf, sendsz, XDR_ENCODE); 822 } 823 if (!xdr_callhdr(&outxdr, &call_msg)) { 824 if (reply_type == RPCBPROC_INDIRECT) 825 svcerr_systemerr(transp); 826 if (debugging) 827 fprintf(stderr, "%s: xdr_callhdr failed\n", __func__); 828 goto error; 829 } 830 if (!xdr_u_int32_t(&outxdr, &(a.rmt_proc))) { 831 if (reply_type == RPCBPROC_INDIRECT) 832 svcerr_systemerr(transp); 833 if (debugging) 834 fprintf(stderr, "%s: xdr_u_long failed\n", __func__); 835 goto error; 836 } 837 838 if (rqstp->rq_cred.oa_flavor == AUTH_NULL) { 839 auth = authnone_create(); 840 } else if (rqstp->rq_cred.oa_flavor == AUTH_SYS) { 841 struct authunix_parms *au; 842 843 au = (struct authunix_parms *)rqstp->rq_clntcred; 844 auth = authunix_create(au->aup_machname, 845 au->aup_uid, au->aup_gid, 846 au->aup_len, au->aup_gids); 847 if (auth == NULL) /* fall back */ 848 auth = authnone_create(); 849 } else { 850 /* we do not support any other authentication scheme */ 851 if (debugging) 852 fprintf(stderr, "%s: oa_flavor != AUTH_NONE and" 853 " oa_flavor != AUTH_SYS\n", __func__); 854 if (reply_type == RPCBPROC_INDIRECT) 855 svcerr_weakauth(transp); /* XXX too strong.. */ 856 goto error; 857 } 858 if (auth == NULL) { 859 if (reply_type == RPCBPROC_INDIRECT) 860 svcerr_systemerr(transp); 861 if (debugging) 862 fprintf(stderr, 863 "%s: authwhatever_create returned NULL\n", 864 __func__); 865 goto error; 866 } 867 if (!AUTH_MARSHALL(auth, &outxdr)) { 868 if (reply_type == RPCBPROC_INDIRECT) 869 svcerr_systemerr(transp); 870 AUTH_DESTROY(auth); 871 if (debugging) 872 fprintf(stderr, 873 "%s: AUTH_MARSHALL failed\n", __func__); 874 goto error; 875 } 876 AUTH_DESTROY(auth); 877 if (!xdr_opaque_parms(&outxdr, &a)) { 878 if (reply_type == RPCBPROC_INDIRECT) 879 svcerr_systemerr(transp); 880 if (debugging) 881 fprintf(stderr, "%s: xdr_opaque_parms failed\n", 882 __func__); 883 goto error; 884 } 885 outlen = (int) XDR_GETPOS(&outxdr); 886 if (outbuf_alloc) 887 outbufp = outbuf_alloc; 888 else 889 outbufp = outbuf; 890 891 na = uaddr2taddr(nconf, local_uaddr); 892 if (!na) { 893 if (reply_type == RPCBPROC_INDIRECT) 894 svcerr_systemerr(transp); 895 goto error; 896 } 897 898 if (sendto(fd, outbufp, outlen, 0, (struct sockaddr *)na->buf, na->len) 899 != outlen) { 900 if (debugging) 901 fprintf(stderr, "%s: sendto failed (%s)\n", __func__, 902 strerror(errno)); 903 if (reply_type == RPCBPROC_INDIRECT) 904 svcerr_systemerr(transp); 905 goto error; 906 } 907 goto out; 908 909 error: 910 if (call_msg.rm_xid != 0) 911 (void) free_slot_by_xid(call_msg.rm_xid); 912 out: 913 if (local_uaddr) 914 free(local_uaddr); 915 if (buf_alloc) 916 free(buf_alloc); 917 if (outbuf_alloc) 918 free(outbuf_alloc); 919 if (na) { 920 free(na->buf); 921 free(na); 922 } 923 if (m_uaddr != NULL) 924 free(m_uaddr); 925 } 926 927 /* 928 * Makes an entry into the FIFO for the given request. 929 * Returns 1 on success, 0 if this is a duplicate request, or -1 on error. 930 * *callxidp is set to the xid of the call. 931 */ 932 static int 933 forward_register(u_int32_t caller_xid, struct netbuf *caller_addr, 934 int forward_fd, char *uaddr, rpcproc_t reply_type, 935 rpcvers_t versnum, u_int32_t *callxidp) 936 { 937 int i; 938 int j = 0; 939 time_t min_time, time_now; 940 static u_int32_t lastxid; 941 int entry = -1; 942 943 min_time = FINFO[0].time; 944 time_now = time((time_t *)0); 945 /* initialization */ 946 if (lastxid == 0) 947 lastxid = time_now * NFORWARD; 948 949 /* 950 * Check if it is a duplicate entry. Then, 951 * try to find an empty slot. If not available, then 952 * use the slot with the earliest time. 953 */ 954 for (i = 0; i < NFORWARD; i++) { 955 if (FINFO[i].flag & FINFO_ACTIVE) { 956 if ((FINFO[i].caller_xid == caller_xid) && 957 (FINFO[i].reply_type == reply_type) && 958 (FINFO[i].versnum == versnum) && 959 (!netbufcmp(FINFO[i].caller_addr, 960 caller_addr))) { 961 FINFO[i].time = time((time_t *)0); 962 return (0); /* Duplicate entry */ 963 } else { 964 /* Should we wait any longer */ 965 if ((time_now - FINFO[i].time) > MAXTIME_OFF) 966 (void) free_slot_by_index(i); 967 } 968 } 969 if (entry == -1) { 970 if ((FINFO[i].flag & FINFO_ACTIVE) == 0) { 971 entry = i; 972 } else if (FINFO[i].time < min_time) { 973 j = i; 974 min_time = FINFO[i].time; 975 } 976 } 977 } 978 if (entry != -1) { 979 /* use this empty slot */ 980 j = entry; 981 } else { 982 (void) free_slot_by_index(j); 983 } 984 if ((FINFO[j].caller_addr = netbufdup(caller_addr)) == NULL) { 985 return (-1); 986 } 987 rpcb_rmtcalls++; /* no of pending calls */ 988 FINFO[j].flag = FINFO_ACTIVE; 989 FINFO[j].reply_type = reply_type; 990 FINFO[j].versnum = versnum; 991 FINFO[j].time = time_now; 992 FINFO[j].caller_xid = caller_xid; 993 FINFO[j].forward_fd = forward_fd; 994 /* 995 * Though uaddr is not allocated here, it will still be freed 996 * from free_slot_*(). 997 */ 998 FINFO[j].uaddr = uaddr; 999 lastxid = lastxid + NFORWARD; 1000 /* Don't allow a zero xid below. */ 1001 if ((u_int32_t)(lastxid + NFORWARD) <= NFORWARD) 1002 lastxid = NFORWARD; 1003 FINFO[j].forward_xid = lastxid + j; /* encode slot */ 1004 *callxidp = FINFO[j].forward_xid; /* forward on this xid */ 1005 return (1); 1006 } 1007 1008 static struct finfo * 1009 forward_find(u_int32_t reply_xid) 1010 { 1011 int i; 1012 1013 i = reply_xid % NFORWARD; 1014 if (i < 0) 1015 i += NFORWARD; 1016 if ((FINFO[i].flag & FINFO_ACTIVE) && 1017 (FINFO[i].forward_xid == reply_xid)) { 1018 return (&FINFO[i]); 1019 } 1020 return (NULL); 1021 } 1022 1023 static int 1024 free_slot_by_xid(u_int32_t xid) 1025 { 1026 int entry; 1027 1028 entry = xid % NFORWARD; 1029 if (entry < 0) 1030 entry += NFORWARD; 1031 return (free_slot_by_index(entry)); 1032 } 1033 1034 static int 1035 free_slot_by_index(int idx) 1036 { 1037 struct finfo *fi; 1038 1039 fi = &FINFO[idx]; 1040 if (fi->flag & FINFO_ACTIVE) { 1041 netbuffree(fi->caller_addr); 1042 /* XXX may be too big, but can't access xprt array here */ 1043 if (fi->forward_fd >= *svc_fdset_getmax()) 1044 (*svc_fdset_getmax())--; 1045 free(fi->uaddr); 1046 fi->flag &= ~FINFO_ACTIVE; 1047 rpcb_rmtcalls--; 1048 return (1); 1049 } 1050 return (0); 1051 } 1052 1053 static int 1054 netbufcmp(struct netbuf *n1, struct netbuf *n2) 1055 { 1056 return ((n1->len != n2->len) || memcmp(n1->buf, n2->buf, n1->len)); 1057 } 1058 1059 static bool_t 1060 netbuf_copybuf(struct netbuf *dst, const struct netbuf *src) 1061 { 1062 assert(src->len <= src->maxlen); 1063 1064 if (dst->maxlen < src->len || dst->buf == NULL) { 1065 if (dst->buf != NULL) 1066 free(dst->buf); 1067 if ((dst->buf = calloc(1, src->maxlen)) == NULL) 1068 return (FALSE); 1069 dst->maxlen = src->maxlen; 1070 } 1071 1072 dst->len = src->len; 1073 memcpy(dst->buf, src->buf, src->len); 1074 1075 return (TRUE); 1076 } 1077 1078 static struct netbuf * 1079 netbufdup(struct netbuf *ap) 1080 { 1081 struct netbuf *np; 1082 1083 if ((np = calloc(1, sizeof(struct netbuf))) == NULL) 1084 return (NULL); 1085 if (netbuf_copybuf(np, ap) == FALSE) { 1086 free(np); 1087 return (NULL); 1088 } 1089 return (np); 1090 } 1091 1092 static void 1093 netbuffree(struct netbuf *ap) 1094 { 1095 free(ap->buf); 1096 ap->buf = NULL; 1097 free(ap); 1098 } 1099 1100 1101 #define MASKVAL (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND) 1102 extern bool_t __svc_clean_idle(fd_set *, int, bool_t); 1103 1104 void 1105 my_svc_run(void) 1106 { 1107 size_t nfds; 1108 struct pollfd *pollfds; 1109 int npollfds, newfdcount; 1110 int poll_ret, check_ret; 1111 int n, *m; 1112 #ifdef SVC_RUN_DEBUG 1113 size_t i; 1114 #endif 1115 struct pollfd *p; 1116 1117 pollfds = NULL; 1118 npollfds = 0; 1119 1120 for (;;) { 1121 newfdcount = svc_fdset_getsize(0); 1122 if (newfdcount != npollfds) { 1123 if (reallocarr(&pollfds, 1124 newfdcount, sizeof(*pollfds)) != 0) { 1125 wait: 1126 syslog(LOG_ERR, "Cannot allocate pollfds"); 1127 sleep(1); 1128 continue; 1129 } 1130 npollfds = newfdcount; 1131 } 1132 p = pollfds; 1133 if ((m = svc_fdset_getmax()) == NULL) 1134 goto wait; 1135 for (n = 0; n <= *m; n++) { 1136 if (svc_fdset_isset(n)) { 1137 p->fd = n; 1138 p->events = MASKVAL; 1139 p++; 1140 } 1141 } 1142 nfds = p - pollfds; 1143 poll_ret = 0; 1144 #ifdef SVC_RUN_DEBUG 1145 if (debugging > 1) { 1146 fprintf(stderr, "%s: polling for read on fd < ", 1147 __func__); 1148 for (i = 0, p = pollfds; i < nfds; i++, p++) 1149 if (p->events) 1150 fprintf(stderr, "%d ", p->fd); 1151 fprintf(stderr, ">\n"); 1152 } 1153 #endif 1154 #ifdef RPCBIND_RUMP 1155 poll_ret = rump_sys_poll(pollfds, nfds, 30 * 1000); 1156 #else 1157 poll_ret = poll(pollfds, nfds, 30 * 1000); 1158 #endif 1159 switch (poll_ret) { 1160 case -1: 1161 /* 1162 * We ignore all errors, continuing with the assumption 1163 * that it was set by the signal handlers (or any 1164 * other outside event) and not caused by poll(). 1165 */ 1166 #ifdef SVC_RUN_DEBUG 1167 if (debugging > 1) { 1168 fprintf(stderr, "%s: poll returned %d (%s)\n", 1169 __func__, poll_ret, strerror(errno)); 1170 } 1171 #endif 1172 /* FALLTHROUGH */ 1173 case 0: 1174 __svc_clean_idle(NULL, 30, FALSE); 1175 continue; 1176 default: 1177 #ifdef SVC_RUN_DEBUG 1178 if (debugging) { 1179 fprintf(stderr, "%s: poll returned read fds < ", 1180 __func__); 1181 for (i = 0, p = pollfds; i < nfds; i++, p++) 1182 if (p->revents) 1183 fprintf(stderr, "%d (%#x)", 1184 p->fd, p->revents); 1185 fprintf(stderr, ">\n"); 1186 } 1187 #endif 1188 /* 1189 * If we found as many replies on callback fds 1190 * as the number of descriptors selectable which 1191 * poll() returned, there can be no more so we 1192 * don't call svc_getreq_poll. Otherwise, there 1193 * must be another so we must call svc_getreq_poll. 1194 */ 1195 if ((check_ret = check_rmtcalls(pollfds, nfds)) == 1196 poll_ret) 1197 continue; 1198 svc_getreq_poll(pollfds, poll_ret-check_ret); 1199 } 1200 #ifdef SVC_RUN_DEBUG 1201 if (debugging) { 1202 fprintf(stderr, "%s: svc_maxfd now %u\n", __func__, 1203 *svc_fdset_getmax()); 1204 } 1205 #endif 1206 } 1207 } 1208 1209 static int 1210 check_rmtcalls(struct pollfd *pfds, int nfds) 1211 { 1212 int j, ncallbacks_found = 0, rmtcalls_pending; 1213 SVCXPRT *xprt; 1214 1215 if (rpcb_rmtcalls == 0) 1216 return (0); 1217 1218 rmtcalls_pending = rpcb_rmtcalls; 1219 for (j = 0; j < nfds; j++) { 1220 if ((xprt = find_rmtcallxprt_by_fd(pfds[j].fd)) != NULL) { 1221 if (pfds[j].revents) { 1222 ncallbacks_found++; 1223 #ifdef DEBUG_RMTCALL 1224 if (debugging) 1225 fprintf(stderr, "%s: polled on forwarding " 1226 "fd %d, netid %s - calling handle_reply\n", 1227 __func__, pfds[j].fd, xprt->xp_netid); 1228 #endif 1229 handle_reply(pfds[j].fd, xprt); 1230 pfds[j].revents = 0; 1231 if (ncallbacks_found >= rmtcalls_pending) { 1232 break; 1233 } 1234 } 1235 } 1236 } 1237 return (ncallbacks_found); 1238 } 1239 1240 static void 1241 xprt_set_caller(SVCXPRT *xprt, struct finfo *fi) 1242 { 1243 u_int32_t *xidp; 1244 1245 netbuf_copybuf(svc_getrpccaller(xprt), fi->caller_addr); 1246 xidp = __rpcb_get_dg_xidp(xprt); 1247 *xidp = fi->caller_xid; 1248 } 1249 1250 /* 1251 * Call svcerr_systemerr() only if RPCBVERS4 1252 */ 1253 static void 1254 send_svcsyserr(SVCXPRT *xprt, struct finfo *fi) 1255 { 1256 if (fi->reply_type == RPCBPROC_INDIRECT) { 1257 xprt_set_caller(xprt, fi); 1258 svcerr_systemerr(xprt); 1259 } 1260 return; 1261 } 1262 1263 static void 1264 handle_reply(int fd, SVCXPRT *xprt) 1265 { 1266 XDR reply_xdrs; 1267 struct rpc_msg reply_msg; 1268 struct rpc_err reply_error; 1269 char *buffer; 1270 struct finfo *fi; 1271 int inlen, pos, len; 1272 struct r_rmtcall_args a; 1273 struct sockaddr_storage ss; 1274 socklen_t fromlen; 1275 #ifdef SVC_RUN_DEBUG 1276 char *uaddr; 1277 #endif 1278 1279 reply_msg.rm_xid = 0; 1280 1281 buffer = malloc(RPC_BUF_MAX); 1282 if (buffer == NULL) 1283 goto done; 1284 1285 do { 1286 fromlen = sizeof(ss); 1287 inlen = recvfrom(fd, buffer, RPC_BUF_MAX, 0, 1288 (struct sockaddr *)&ss, &fromlen); 1289 } while (inlen < 0 && errno == EINTR); 1290 if (inlen < 0) { 1291 if (debugging) 1292 fprintf(stderr, "%s: recvfrom returned %d (%s)\n", 1293 __func__, inlen, strerror(errno)); 1294 goto done; 1295 } 1296 1297 reply_msg.acpted_rply.ar_verf = _null_auth; 1298 reply_msg.acpted_rply.ar_results.where = 0; 1299 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 1300 1301 xdrmem_create(&reply_xdrs, buffer, (u_int)inlen, XDR_DECODE); 1302 if (!xdr_replymsg(&reply_xdrs, &reply_msg)) { 1303 if (debugging) 1304 fprintf(stderr, "%s: xdr_replymsg failed\n", __func__); 1305 goto done; 1306 } 1307 fi = forward_find(reply_msg.rm_xid); 1308 #ifdef SVC_RUN_DEBUG 1309 if (debugging) { 1310 fprintf(stderr, "%s: reply xid: %d fi addr: %p\n", 1311 __func__, reply_msg.rm_xid, fi); 1312 } 1313 #endif 1314 if (fi == NULL) { 1315 goto done; 1316 } 1317 _seterr_reply(&reply_msg, &reply_error); 1318 if (reply_error.re_status != RPC_SUCCESS) { 1319 if (debugging) 1320 fprintf(stderr, "%s: %s\n", __func__, 1321 clnt_sperrno(reply_error.re_status)); 1322 send_svcsyserr(xprt, fi); 1323 goto done; 1324 } 1325 pos = XDR_GETPOS(&reply_xdrs); 1326 len = inlen - pos; 1327 a.rmt_args.args = &buffer[pos]; 1328 a.rmt_args.arglen = len; 1329 a.rmt_uaddr = fi->uaddr; 1330 a.rmt_localvers = fi->versnum; 1331 1332 xprt_set_caller(xprt, fi); 1333 #ifdef SVC_RUN_DEBUG 1334 uaddr = taddr2uaddr(rpcbind_get_conf("udp"), 1335 svc_getrpccaller(xprt)); 1336 if (debugging) { 1337 fprintf(stderr, "%s:forwarding address %s to %s\n", 1338 __func__, a.rmt_uaddr, uaddr ? uaddr : rpcbind_unknown); 1339 } 1340 if (uaddr) 1341 free(uaddr); 1342 #endif 1343 svc_sendreply(xprt, (xdrproc_t) xdr_rmtcall_result, (char *) &a); 1344 done: 1345 if (buffer) 1346 free(buffer); 1347 1348 if (reply_msg.rm_xid == 0) { 1349 #ifdef SVC_RUN_DEBUG 1350 if (debugging) { 1351 fprintf(stderr, "%s: NULL xid on exit!\n", __func__); 1352 } 1353 #endif 1354 } else 1355 (void) free_slot_by_xid(reply_msg.rm_xid); 1356 return; 1357 } 1358 1359 static void 1360 find_versions(rpcprog_t prog, char *netid, rpcvers_t *lowvp, rpcvers_t *highvp) 1361 { 1362 rpcblist_ptr rbl; 1363 rpcvers_t lowv = 0; 1364 rpcvers_t highv = 0; 1365 1366 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 1367 if ((rbl->rpcb_map.r_prog != prog) || 1368 ((rbl->rpcb_map.r_netid != NULL) && 1369 (strcasecmp(rbl->rpcb_map.r_netid, netid) != 0))) 1370 continue; 1371 if (lowv == 0) { 1372 highv = rbl->rpcb_map.r_vers; 1373 lowv = highv; 1374 } else if (rbl->rpcb_map.r_vers < lowv) { 1375 lowv = rbl->rpcb_map.r_vers; 1376 } else if (rbl->rpcb_map.r_vers > highv) { 1377 highv = rbl->rpcb_map.r_vers; 1378 } 1379 } 1380 *lowvp = lowv; 1381 *highvp = highv; 1382 return; 1383 } 1384 1385 /* 1386 * returns the item with the given program, version number and netid. 1387 * If that version number is not found, it returns the item with that 1388 * program number, so that address is now returned to the caller. The 1389 * caller when makes a call to this program, version number, the call 1390 * will fail and it will return with PROGVERS_MISMATCH. The user can 1391 * then determine the highest and the lowest version number for this 1392 * program using clnt_geterr() and use those program version numbers. 1393 * 1394 * Returns the RPCBLIST for the given prog, vers and netid 1395 */ 1396 static rpcblist_ptr 1397 find_service(rpcprog_t prog, rpcvers_t vers, char *netid) 1398 { 1399 rpcblist_ptr hit = NULL; 1400 rpcblist_ptr rbl; 1401 1402 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 1403 if ((rbl->rpcb_map.r_prog != prog) || 1404 ((rbl->rpcb_map.r_netid != NULL) && 1405 (strcasecmp(rbl->rpcb_map.r_netid, netid) != 0))) 1406 continue; 1407 hit = rbl; 1408 if (rbl->rpcb_map.r_vers == vers) 1409 break; 1410 } 1411 return (hit); 1412 } 1413 1414 /* 1415 * Copies the name associated with the uid of the caller and returns 1416 * a pointer to it. Similar to getwd(). 1417 */ 1418 static char * 1419 getowner(SVCXPRT *transp, char *owner, size_t ownersize) 1420 { 1421 struct sockcred *sc; 1422 1423 sc = __svc_getcallercreds(transp); 1424 if (sc == NULL) 1425 strlcpy(owner, rpcbind_unknown, ownersize); 1426 else if (sc->sc_uid == 0) 1427 strlcpy(owner, rpcbind_superuser, ownersize); 1428 else 1429 snprintf(owner, ownersize, "%d", sc->sc_uid); 1430 1431 return owner; 1432 } 1433 1434 #ifdef PORTMAP 1435 /* 1436 * Add this to the pmap list only if it is UDP or TCP. 1437 */ 1438 static int 1439 add_pmaplist(RPCB *arg) 1440 { 1441 struct pmap pmap; 1442 struct pmaplist *pml; 1443 int h1, h2, h3, h4, p1, p2; 1444 1445 if (strcmp(arg->r_netid, udptrans) == 0) { 1446 /* It is UDP! */ 1447 pmap.pm_prot = IPPROTO_UDP; 1448 } else if (strcmp(arg->r_netid, tcptrans) == 0) { 1449 /* It is TCP */ 1450 pmap.pm_prot = IPPROTO_TCP; 1451 } else 1452 /* Not an IP protocol */ 1453 return (0); 1454 1455 /* interpret the universal address for TCP/IP */ 1456 if (sscanf(arg->r_addr, "%d.%d.%d.%d.%d.%d", 1457 &h1, &h2, &h3, &h4, &p1, &p2) != 6) 1458 return (0); 1459 pmap.pm_port = ((p1 & 0xff) << 8) + (p2 & 0xff); 1460 pmap.pm_prog = arg->r_prog; 1461 pmap.pm_vers = arg->r_vers; 1462 /* 1463 * add to END of list 1464 */ 1465 pml = malloc(sizeof(*pml)); 1466 if (pml == NULL) { 1467 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 1468 return (1); 1469 } 1470 pml->pml_map = pmap; 1471 pml->pml_next = NULL; 1472 if (list_pml == NULL) { 1473 list_pml = pml; 1474 } else { 1475 struct pmaplist *fnd; 1476 1477 /* Attach to the end of the list */ 1478 for (fnd = list_pml; fnd->pml_next; fnd = fnd->pml_next) 1479 continue; 1480 fnd->pml_next = pml; 1481 } 1482 return (0); 1483 } 1484 1485 /* 1486 * Delete this from the pmap list only if it is UDP or TCP. 1487 */ 1488 static int 1489 del_pmaplist(RPCB *arg) 1490 { 1491 struct pmaplist *pml; 1492 struct pmaplist *prevpml, *fnd; 1493 unsigned long prot; 1494 1495 if (strcmp(arg->r_netid, udptrans) == 0) { 1496 /* It is UDP! */ 1497 prot = IPPROTO_UDP; 1498 } else if (strcmp(arg->r_netid, tcptrans) == 0) { 1499 /* It is TCP */ 1500 prot = IPPROTO_TCP; 1501 } else if (arg->r_netid[0] == 0) { 1502 prot = 0; /* Remove all occurrences */ 1503 } else { 1504 /* Not an IP protocol */ 1505 return (0); 1506 } 1507 for (prevpml = NULL, pml = list_pml; pml; /* cstyle */) { 1508 if ((pml->pml_map.pm_prog != arg->r_prog) || 1509 (pml->pml_map.pm_vers != arg->r_vers) || 1510 (prot && (pml->pml_map.pm_prot != prot))) { 1511 /* both pml & prevpml move forwards */ 1512 prevpml = pml; 1513 pml = pml->pml_next; 1514 continue; 1515 } 1516 /* found it; pml moves forward, prevpml stays */ 1517 fnd = pml; 1518 pml = pml->pml_next; 1519 if (prevpml == NULL) 1520 list_pml = pml; 1521 else 1522 prevpml->pml_next = pml; 1523 free(fnd); 1524 } 1525 return (0); 1526 } 1527 #endif /* PORTMAP */ 1528
Indexes created Sun Sep 21 15:09:59 GMT 2025