1 /* $NetBSD: rpcb_svc_com.c,v 1.22 2019/01/03 19:26:50 christos 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_syscalls.h> 66 #endif 67 68 #include "svc_dg.h" 69 #include "rpcbind.h" 70 #ifdef RPCBIND_RUMP 71 #include "svc_fdset.h" 72 #endif 73 74 #define RPC_BUF_MAX 65536 /* can be raised if required */ 75 76 static char nullstring[] = ""; 77 static int rpcb_rmtcalls; 78 79 struct rmtcallfd_list { 80 int fd; 81 SVCXPRT *xprt; 82 char *netid; 83 struct rmtcallfd_list *next; 84 }; 85 86 #define NFORWARD 64 87 #define MAXTIME_OFF 300 /* 5 minutes */ 88 89 struct finfo { 90 int flag; 91 #define FINFO_ACTIVE 0x1 92 u_int32_t caller_xid; 93 struct netbuf *caller_addr; 94 u_int32_t forward_xid; 95 int forward_fd; 96 char *uaddr; 97 rpcproc_t reply_type; 98 rpcvers_t versnum; 99 time_t time; 100 }; 101 static struct finfo FINFO[NFORWARD]; 102 103 104 static bool_t xdr_encap_parms(XDR *, struct encap_parms *); 105 static bool_t xdr_rmtcall_args(XDR *, struct r_rmtcall_args *); 106 static bool_t xdr_rmtcall_result(XDR *, struct r_rmtcall_args *); 107 static bool_t xdr_opaque_parms(XDR *, struct r_rmtcall_args *); 108 static int find_rmtcallfd_by_netid(char *); 109 static SVCXPRT *find_rmtcallxprt_by_fd(int); 110 static int forward_register(u_int32_t, struct netbuf *, int, char *, 111 rpcproc_t, rpcvers_t, u_int32_t *); 112 static struct finfo *forward_find(u_int32_t); 113 static int free_slot_by_xid(u_int32_t); 114 static int free_slot_by_index(int); 115 static int netbufcmp(struct netbuf *, struct netbuf *); 116 static struct netbuf *netbufdup(struct netbuf *); 117 static void netbuffree(struct netbuf *); 118 static int check_rmtcalls(struct pollfd *, int); 119 static void xprt_set_caller(SVCXPRT *, struct finfo *); 120 static void send_svcsyserr(SVCXPRT *, struct finfo *); 121 static void handle_reply(int, SVCXPRT *); 122 static void find_versions(rpcprog_t, char *, rpcvers_t *, rpcvers_t *); 123 static rpcblist_ptr find_service(rpcprog_t, rpcvers_t, char *); 124 static char *getowner(SVCXPRT *, char *, size_t); 125 static int add_pmaplist(RPCB *); 126 static int del_pmaplist(RPCB *); 127 128 /* 129 * Set a mapping of program, version, netid 130 */ 131 /* ARGSUSED */ 132 void * 133 rpcbproc_set_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 134 rpcvers_t rpcbversnum) 135 { 136 RPCB *regp = arg; 137 static bool_t ans; 138 char owner[64]; 139 140 #ifdef RPCBIND_DEBUG 141 if (debugging) 142 fprintf(stderr, "RPCB_SET request for (%lu, %lu, %s, %s) : ", 143 (unsigned long)regp->r_prog, (unsigned long)regp->r_vers, 144 regp->r_netid, regp->r_addr); 145 #endif 146 ans = map_set(regp, getowner(transp, owner, sizeof owner)); 147 #ifdef RPCBIND_DEBUG 148 if (debugging) 149 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 150 #endif 151 /* XXX: should have used some defined constant here */ 152 rpcbs_set(rpcbversnum - 2, ans); 153 return (void *)&ans; 154 } 155 156 bool_t 157 map_set(RPCB *regp, char *owner) 158 { 159 RPCB reg, *a; 160 rpcblist_ptr rbl, fnd; 161 162 reg = *regp; 163 /* 164 * check to see if already used 165 * find_service returns a hit even if 166 * the versions don't match, so check for it 167 */ 168 fnd = find_service(reg.r_prog, reg.r_vers, reg.r_netid); 169 if (fnd && (fnd->rpcb_map.r_vers == reg.r_vers)) { 170 if (!strcmp(fnd->rpcb_map.r_addr, reg.r_addr)) 171 /* 172 * if these match then it is already 173 * registered so just say "OK". 174 */ 175 return (TRUE); 176 else 177 return (FALSE); 178 } 179 /* 180 * add to the end of the list 181 */ 182 rbl = malloc(sizeof(*rbl)); 183 if (rbl == NULL) 184 return (FALSE); 185 a = &(rbl->rpcb_map); 186 a->r_prog = reg.r_prog; 187 a->r_vers = reg.r_vers; 188 a->r_netid = strdup(reg.r_netid); 189 a->r_addr = strdup(reg.r_addr); 190 a->r_owner = strdup(owner); 191 if (!a->r_addr || !a->r_netid || !a->r_owner) { 192 if (a->r_netid) 193 free(a->r_netid); 194 if (a->r_addr) 195 free(a->r_addr); 196 if (a->r_owner) 197 free(a->r_owner); 198 free(rbl); 199 return (FALSE); 200 } 201 rbl->rpcb_next = NULL; 202 if (list_rbl == NULL) { 203 list_rbl = rbl; 204 } else { 205 for (fnd = list_rbl; fnd->rpcb_next; 206 fnd = fnd->rpcb_next) 207 ; 208 fnd->rpcb_next = rbl; 209 } 210 #ifdef PORTMAP 211 (void) add_pmaplist(regp); 212 #endif 213 return (TRUE); 214 } 215 216 /* 217 * Unset a mapping of program, version, netid 218 */ 219 /* ARGSUSED */ 220 void * 221 rpcbproc_unset_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 222 rpcvers_t rpcbversnum) 223 { 224 RPCB *regp = arg; 225 static bool_t ans; 226 char owner[64]; 227 228 #ifdef RPCBIND_DEBUG 229 if (debugging) 230 fprintf(stderr, "RPCB_UNSET request for (%lu, %lu, %s) : ", 231 (unsigned long)regp->r_prog, (unsigned long)regp->r_vers, 232 regp->r_netid); 233 #endif 234 ans = map_unset(regp, getowner(transp, owner, sizeof owner)); 235 #ifdef RPCBIND_DEBUG 236 if (debugging) 237 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 238 #endif 239 /* XXX: should have used some defined constant here */ 240 rpcbs_unset(rpcbversnum - 2, ans); 241 return (void *)&ans; 242 } 243 244 bool_t 245 map_unset(RPCB *regp, const char *owner) 246 { 247 int ans = 0; 248 rpcblist_ptr rbl, prev, tmp; 249 250 if (owner == NULL) 251 return (0); 252 253 for (prev = NULL, rbl = list_rbl; rbl; /* cstyle */) { 254 if ((rbl->rpcb_map.r_prog != regp->r_prog) || 255 (rbl->rpcb_map.r_vers != regp->r_vers) || 256 (regp->r_netid[0] && strcasecmp(regp->r_netid, 257 rbl->rpcb_map.r_netid))) { 258 /* both rbl & prev move forwards */ 259 prev = rbl; 260 rbl = rbl->rpcb_next; 261 continue; 262 } 263 /* 264 * Check whether appropriate uid. Unset only 265 * if superuser or the owner itself. 266 */ 267 if (strcmp(owner, rpcbind_superuser) && 268 strcmp(rbl->rpcb_map.r_owner, owner)) 269 return (0); 270 /* found it; rbl moves forward, prev stays */ 271 ans = 1; 272 tmp = rbl; 273 rbl = rbl->rpcb_next; 274 if (prev == NULL) 275 list_rbl = rbl; 276 else 277 prev->rpcb_next = rbl; 278 free(tmp->rpcb_map.r_addr); 279 free(tmp->rpcb_map.r_netid); 280 free(tmp->rpcb_map.r_owner); 281 free(tmp); 282 } 283 #ifdef PORTMAP 284 if (ans) 285 (void) del_pmaplist(regp); 286 #endif 287 /* 288 * We return 1 either when the entry was not there or it 289 * was able to unset it. It can come to this point only if 290 * atleast one of the conditions is true. 291 */ 292 return (1); 293 } 294 295 void 296 delete_prog(rpcprog_t prog) 297 { 298 RPCB reg; 299 rpcblist_ptr rbl; 300 301 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 302 if ((rbl->rpcb_map.r_prog != prog)) 303 continue; 304 if (is_bound(rbl->rpcb_map.r_netid, rbl->rpcb_map.r_addr)) 305 continue; 306 reg.r_prog = rbl->rpcb_map.r_prog; 307 reg.r_vers = rbl->rpcb_map.r_vers; 308 reg.r_netid = strdup(rbl->rpcb_map.r_netid); 309 if (reg.r_netid == NULL) 310 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 311 else { 312 (void)map_unset(®, rpcbind_superuser); 313 free(reg.r_netid); 314 } 315 } 316 } 317 318 void * 319 rpcbproc_getaddr_com(RPCB *regp, struct svc_req *rqstp __unused, 320 SVCXPRT *transp, rpcvers_t rpcbversnum, rpcvers_t verstype) 321 { 322 static char *uaddr; 323 char *saddr = NULL; 324 rpcblist_ptr fnd; 325 326 if (uaddr != NULL && uaddr != nullstring) { 327 free(uaddr); 328 uaddr = NULL; 329 } 330 fnd = find_service(regp->r_prog, regp->r_vers, transp->xp_netid); 331 if (fnd && ((verstype == RPCB_ALLVERS) || 332 (regp->r_vers == fnd->rpcb_map.r_vers))) { 333 if (*(regp->r_addr) != '\0') { /* may contain a hint about */ 334 saddr = regp->r_addr; /* the interface that we */ 335 } /* should use */ 336 if (!(uaddr = mergeaddr(transp, transp->xp_netid, 337 fnd->rpcb_map.r_addr, saddr))) { 338 /* Try whatever we have */ 339 uaddr = strdup(fnd->rpcb_map.r_addr); 340 } else if (!uaddr[0]) { 341 /* 342 * The server died. Unset all versions of this prog. 343 */ 344 delete_prog(regp->r_prog); 345 uaddr = nullstring; 346 } 347 } else { 348 uaddr = nullstring; 349 } 350 #ifdef RPCBIND_DEBUG 351 if (debugging) 352 fprintf(stderr, "getaddr: %s\n", uaddr); 353 #endif 354 /* XXX: should have used some defined constant here */ 355 rpcbs_getaddr(rpcbversnum - 2, regp->r_prog, regp->r_vers, 356 transp->xp_netid, uaddr); 357 return (void *)&uaddr; 358 } 359 360 /* ARGSUSED */ 361 void * 362 rpcbproc_gettime_com(void *arg __unused, struct svc_req *rqstp __unused, 363 SVCXPRT *transp __unused, rpcvers_t rpcbversnum __unused) 364 { 365 static time_t curtime; 366 367 (void) time(&curtime); 368 return &curtime; 369 } 370 371 /* 372 * Convert uaddr to taddr. Should be used only by 373 * local servers/clients. (kernel level stuff only) 374 */ 375 /* ARGSUSED */ 376 void * 377 rpcbproc_uaddr2taddr_com(void *arg, struct svc_req *rqstp __unused, 378 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 379 { 380 char **uaddrp = arg; 381 struct netconfig *nconf; 382 static struct netbuf nbuf; 383 static struct netbuf *taddr; 384 385 if (taddr) { 386 free(taddr->buf); 387 free(taddr); 388 taddr = NULL; 389 } 390 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 391 ((taddr = uaddr2taddr(nconf, *uaddrp)) == NULL)) { 392 (void) memset(&nbuf, 0, sizeof (struct netbuf)); 393 return &nbuf; 394 } 395 return taddr; 396 } 397 398 /* 399 * Convert taddr to uaddr. Should be used only by 400 * local servers/clients. (kernel level stuff only) 401 */ 402 /* ARGSUSED */ 403 void * 404 rpcbproc_taddr2uaddr_com(void *arg, struct svc_req *rqstp __unused, 405 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 406 { 407 struct netbuf *taddr = arg; 408 static char *uaddr; 409 struct netconfig *nconf; 410 411 #ifdef CHEW_FDS 412 int fd; 413 414 if ((fd = open("/dev/null", O_RDONLY)) == -1) { 415 uaddr = strerror(errno); 416 return (&uaddr); 417 } 418 #endif /* CHEW_FDS */ 419 if (uaddr != NULL && uaddr != nullstring) { 420 free(uaddr); 421 uaddr = NULL; 422 } 423 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 424 ((uaddr = taddr2uaddr(nconf, taddr)) == NULL)) { 425 uaddr = nullstring; 426 } 427 return (void *)&uaddr; 428 } 429 430 431 static bool_t 432 xdr_encap_parms(XDR *xdrs, struct encap_parms *epp) 433 { 434 return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), 435 RPC_MAXDATASIZE)); 436 } 437 438 /* 439 * XDR remote call arguments. It ignores the address part. 440 * written for XDR_DECODE direction only 441 */ 442 static bool_t 443 xdr_rmtcall_args(XDR *xdrs, struct r_rmtcall_args *cap) 444 { 445 /* does not get the address or the arguments */ 446 if (xdr_rpcprog(xdrs, &(cap->rmt_prog)) && 447 xdr_rpcvers(xdrs, &(cap->rmt_vers)) && 448 xdr_rpcproc(xdrs, &(cap->rmt_proc))) { 449 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 450 } 451 return (FALSE); 452 } 453 454 /* 455 * XDR remote call results along with the address. Ignore 456 * program number, version number and proc number. 457 * Written for XDR_ENCODE direction only. 458 */ 459 static bool_t 460 xdr_rmtcall_result(XDR *xdrs, struct r_rmtcall_args *cap) 461 { 462 bool_t result; 463 464 #ifdef PORTMAP 465 if (cap->rmt_localvers == PMAPVERS) { 466 int h1, h2, h3, h4, p1, p2; 467 u_long port; 468 469 /* interpret the universal address for TCP/IP */ 470 if (sscanf(cap->rmt_uaddr, "%d.%d.%d.%d.%d.%d", 471 &h1, &h2, &h3, &h4, &p1, &p2) != 6) 472 return (FALSE); 473 port = ((p1 & 0xff) << 8) + (p2 & 0xff); 474 result = xdr_u_long(xdrs, &port); 475 } else 476 #endif 477 if ((cap->rmt_localvers == RPCBVERS) || 478 (cap->rmt_localvers == RPCBVERS4)) { 479 result = xdr_wrapstring(xdrs, &(cap->rmt_uaddr)); 480 } else { 481 return (FALSE); 482 } 483 if (result == TRUE) 484 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 485 return (FALSE); 486 } 487 488 /* 489 * only worries about the struct encap_parms part of struct r_rmtcall_args. 490 * The arglen must already be set!! 491 */ 492 static bool_t 493 xdr_opaque_parms(XDR *xdrs, struct r_rmtcall_args *cap) 494 { 495 return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen)); 496 } 497 498 static struct rmtcallfd_list *rmthead; 499 static struct rmtcallfd_list *rmttail; 500 501 int 502 create_rmtcall_fd(struct netconfig *nconf) 503 { 504 int fd; 505 struct rmtcallfd_list *rmt; 506 SVCXPRT *xprt; 507 508 if ((fd = __rpc_nconf2fd(nconf)) == -1) { 509 if (debugging) 510 fprintf(stderr, 511 "create_rmtcall_fd: couldn't open \"%s\" (errno %d)\n", 512 nconf->nc_device, 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, 658 "rpcbproc_callit_com: No Memory!\n"); 659 if (reply_type == RPCBPROC_INDIRECT) 660 svcerr_systemerr(transp); 661 return; 662 } 663 a.rmt_args.args = buf_alloc; 664 } else { 665 a.rmt_args.args = buf; 666 } 667 668 call_msg.rm_xid = 0; /* For error checking purposes */ 669 if (!svc_getargs(transp, (xdrproc_t) xdr_rmtcall_args, (char *) &a)) { 670 if (reply_type == RPCBPROC_INDIRECT) 671 svcerr_decode(transp); 672 if (debugging) 673 fprintf(stderr, 674 "rpcbproc_callit_com: svc_getargs failed\n"); 675 goto error; 676 } 677 678 if (!check_callit(transp, &a, versnum)) { 679 svcerr_weakauth(transp); 680 goto error; 681 } 682 683 caller = svc_getrpccaller(transp); 684 #ifdef RPCBIND_DEBUG 685 if (debugging) { 686 uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid), caller); 687 fprintf(stderr, "%s %s req for (%lu, %lu, %lu, %s) from %s : ", 688 versnum == PMAPVERS ? "pmap_rmtcall" : 689 versnum == RPCBVERS ? "rpcb_rmtcall" : 690 versnum == RPCBVERS4 ? "rpcb_indirect" : 691 rpcbind_unknown, 692 reply_type == RPCBPROC_INDIRECT ? "indirect" : "callit", 693 (unsigned long)a.rmt_prog, (unsigned long)a.rmt_vers, 694 (unsigned long)a.rmt_proc, transp->xp_netid, 695 uaddr ? uaddr : rpcbind_unknown); 696 if (uaddr) 697 free(uaddr); 698 } 699 #endif 700 701 rbl = find_service(a.rmt_prog, a.rmt_vers, transp->xp_netid); 702 703 rpcbs_rmtcall(versnum - 2, reply_type, a.rmt_prog, a.rmt_vers, 704 a.rmt_proc, transp->xp_netid, rbl); 705 706 if (rbl == NULL) { 707 #ifdef RPCBIND_DEBUG 708 if (debugging) 709 fprintf(stderr, "not found\n"); 710 #endif 711 if (reply_type == RPCBPROC_INDIRECT) 712 svcerr_noprog(transp); 713 goto error; 714 } 715 if (rbl->rpcb_map.r_vers != a.rmt_vers) { 716 if (reply_type == RPCBPROC_INDIRECT) { 717 rpcvers_t vers_low, vers_high; 718 719 find_versions(a.rmt_prog, transp->xp_netid, 720 &vers_low, &vers_high); 721 svcerr_progvers(transp, vers_low, vers_high); 722 } 723 goto error; 724 } 725 726 #ifdef RPCBIND_DEBUG 727 if (debugging) 728 fprintf(stderr, "found at uaddr %s\n", rbl->rpcb_map.r_addr); 729 #endif 730 /* 731 * Check whether this entry is valid and a server is present 732 * Mergeaddr() returns NULL if no such entry is present, and 733 * returns "" if the entry was present but the server is not 734 * present (i.e., it crashed). 735 */ 736 if (reply_type == RPCBPROC_INDIRECT) { 737 uaddr = mergeaddr(transp, transp->xp_netid, 738 rbl->rpcb_map.r_addr, NULL); 739 if (uaddr == NULL || uaddr[0] == '\0') { 740 svcerr_noprog(transp); 741 free(uaddr); 742 goto error; 743 } 744 free(uaddr); 745 } 746 nconf = rpcbind_get_conf(transp->xp_netid); 747 if (nconf == NULL) { 748 if (reply_type == RPCBPROC_INDIRECT) 749 svcerr_systemerr(transp); 750 if (debugging) 751 fprintf(stderr, 752 "rpcbproc_callit_com: rpcbind_get_conf failed\n"); 753 goto error; 754 } 755 localsa = local_sa(((struct sockaddr *)caller->buf)->sa_family); 756 if (localsa == NULL) { 757 if (debugging) 758 fprintf(stderr, 759 "rpcbproc_callit_com: no local address\n"); 760 goto error; 761 } 762 tbuf.len = tbuf.maxlen = localsa->sa_len; 763 tbuf.buf = localsa; 764 local_uaddr = 765 addrmerge(&tbuf, rbl->rpcb_map.r_addr, NULL, nconf->nc_netid); 766 m_uaddr = addrmerge(caller, rbl->rpcb_map.r_addr, NULL, 767 nconf->nc_netid); 768 #ifdef RPCBIND_DEBUG 769 if (debugging) 770 fprintf(stderr, "merged uaddr %s\n", m_uaddr); 771 #endif 772 if ((fd = find_rmtcallfd_by_netid(nconf->nc_netid)) == -1) { 773 if (reply_type == RPCBPROC_INDIRECT) 774 svcerr_systemerr(transp); 775 goto error; 776 } 777 xidp = __rpcb_get_dg_xidp(transp); 778 switch (forward_register(*xidp, caller, fd, m_uaddr, reply_type, 779 versnum, &call_msg.rm_xid)) { 780 case 1: 781 /* Success; forward_register() will free m_uaddr for us. */ 782 m_uaddr = NULL; 783 break; 784 case 0: 785 /* 786 * A duplicate request for the slow server. Let's not 787 * beat on it any more. 788 */ 789 if (debugging) 790 fprintf(stderr, 791 "rpcbproc_callit_com: duplicate request\n"); 792 goto error; 793 case -1: 794 /* forward_register failed. Perhaps no memory. */ 795 if (debugging) 796 fprintf(stderr, 797 "rpcbproc_callit_com: forward_register failed\n"); 798 goto error; 799 } 800 801 #ifdef DEBUG_RMTCALL 802 if (debugging) 803 fprintf(stderr, 804 "rpcbproc_callit_com: original XID %x, new XID %x\n", 805 *xidp, call_msg.rm_xid); 806 #endif 807 call_msg.rm_direction = CALL; 808 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 809 call_msg.rm_call.cb_prog = a.rmt_prog; 810 call_msg.rm_call.cb_vers = a.rmt_vers; 811 if (sendsz > RPC_BUF_MAX) { 812 #ifdef notyet 813 outbuf_alloc = alloca(sendsz); /* not in IDR2? */ 814 #else 815 outbuf_alloc = malloc(sendsz); 816 #endif /* notyet */ 817 if (outbuf_alloc == NULL) { 818 if (reply_type == RPCBPROC_INDIRECT) 819 svcerr_systemerr(transp); 820 syslog(LOG_ERR, "%s: Cannot allocate memory", __func__); 821 goto error; 822 } 823 xdrmem_create(&outxdr, outbuf_alloc, sendsz, XDR_ENCODE); 824 } else { 825 xdrmem_create(&outxdr, outbuf, sendsz, XDR_ENCODE); 826 } 827 if (!xdr_callhdr(&outxdr, &call_msg)) { 828 if (reply_type == RPCBPROC_INDIRECT) 829 svcerr_systemerr(transp); 830 if (debugging) 831 fprintf(stderr, 832 "rpcbproc_callit_com: xdr_callhdr failed\n"); 833 goto error; 834 } 835 if (!xdr_u_int32_t(&outxdr, &(a.rmt_proc))) { 836 if (reply_type == RPCBPROC_INDIRECT) 837 svcerr_systemerr(transp); 838 if (debugging) 839 fprintf(stderr, 840 "rpcbproc_callit_com: xdr_u_long failed\n"); 841 goto error; 842 } 843 844 if (rqstp->rq_cred.oa_flavor == AUTH_NULL) { 845 auth = authnone_create(); 846 } else if (rqstp->rq_cred.oa_flavor == AUTH_SYS) { 847 struct authunix_parms *au; 848 849 au = (struct authunix_parms *)rqstp->rq_clntcred; 850 auth = authunix_create(au->aup_machname, 851 au->aup_uid, au->aup_gid, 852 au->aup_len, au->aup_gids); 853 if (auth == NULL) /* fall back */ 854 auth = authnone_create(); 855 } else { 856 /* we do not support any other authentication scheme */ 857 if (debugging) 858 fprintf(stderr, 859 "rpcbproc_callit_com: oa_flavor != AUTH_NONE and oa_flavor != AUTH_SYS\n"); 860 if (reply_type == RPCBPROC_INDIRECT) 861 svcerr_weakauth(transp); /* XXX too strong.. */ 862 goto error; 863 } 864 if (auth == NULL) { 865 if (reply_type == RPCBPROC_INDIRECT) 866 svcerr_systemerr(transp); 867 if (debugging) 868 fprintf(stderr, 869 "rpcbproc_callit_com: authwhatever_create returned NULL\n"); 870 goto error; 871 } 872 if (!AUTH_MARSHALL(auth, &outxdr)) { 873 if (reply_type == RPCBPROC_INDIRECT) 874 svcerr_systemerr(transp); 875 AUTH_DESTROY(auth); 876 if (debugging) 877 fprintf(stderr, 878 "rpcbproc_callit_com: AUTH_MARSHALL failed\n"); 879 goto error; 880 } 881 AUTH_DESTROY(auth); 882 if (!xdr_opaque_parms(&outxdr, &a)) { 883 if (reply_type == RPCBPROC_INDIRECT) 884 svcerr_systemerr(transp); 885 if (debugging) 886 fprintf(stderr, 887 "rpcbproc_callit_com: xdr_opaque_parms failed\n"); 888 goto error; 889 } 890 outlen = (int) XDR_GETPOS(&outxdr); 891 if (outbuf_alloc) 892 outbufp = outbuf_alloc; 893 else 894 outbufp = outbuf; 895 896 na = uaddr2taddr(nconf, local_uaddr); 897 if (!na) { 898 if (reply_type == RPCBPROC_INDIRECT) 899 svcerr_systemerr(transp); 900 goto error; 901 } 902 903 if (sendto(fd, outbufp, outlen, 0, (struct sockaddr *)na->buf, na->len) 904 != outlen) { 905 if (debugging) 906 fprintf(stderr, 907 "rpcbproc_callit_com: sendto failed: errno %d\n", errno); 908 if (reply_type == RPCBPROC_INDIRECT) 909 svcerr_systemerr(transp); 910 goto error; 911 } 912 goto out; 913 914 error: 915 if (call_msg.rm_xid != 0) 916 (void) free_slot_by_xid(call_msg.rm_xid); 917 out: 918 if (local_uaddr) 919 free(local_uaddr); 920 if (buf_alloc) 921 free(buf_alloc); 922 if (outbuf_alloc) 923 free(outbuf_alloc); 924 if (na) { 925 free(na->buf); 926 free(na); 927 } 928 if (m_uaddr != NULL) 929 free(m_uaddr); 930 } 931 932 /* 933 * Makes an entry into the FIFO for the given request. 934 * Returns 1 on success, 0 if this is a duplicate request, or -1 on error. 935 * *callxidp is set to the xid of the call. 936 */ 937 static int 938 forward_register(u_int32_t caller_xid, struct netbuf *caller_addr, 939 int forward_fd, char *uaddr, rpcproc_t reply_type, 940 rpcvers_t versnum, u_int32_t *callxidp) 941 { 942 int i; 943 int j = 0; 944 time_t min_time, time_now; 945 static u_int32_t lastxid; 946 int entry = -1; 947 948 min_time = FINFO[0].time; 949 time_now = time((time_t *)0); 950 /* initialization */ 951 if (lastxid == 0) 952 lastxid = time_now * NFORWARD; 953 954 /* 955 * Check if it is a duplicate entry. Then, 956 * try to find an empty slot. If not available, then 957 * use the slot with the earliest time. 958 */ 959 for (i = 0; i < NFORWARD; i++) { 960 if (FINFO[i].flag & FINFO_ACTIVE) { 961 if ((FINFO[i].caller_xid == caller_xid) && 962 (FINFO[i].reply_type == reply_type) && 963 (FINFO[i].versnum == versnum) && 964 (!netbufcmp(FINFO[i].caller_addr, 965 caller_addr))) { 966 FINFO[i].time = time((time_t *)0); 967 return (0); /* Duplicate entry */ 968 } else { 969 /* Should we wait any longer */ 970 if ((time_now - FINFO[i].time) > MAXTIME_OFF) 971 (void) free_slot_by_index(i); 972 } 973 } 974 if (entry == -1) { 975 if ((FINFO[i].flag & FINFO_ACTIVE) == 0) { 976 entry = i; 977 } else if (FINFO[i].time < min_time) { 978 j = i; 979 min_time = FINFO[i].time; 980 } 981 } 982 } 983 if (entry != -1) { 984 /* use this empty slot */ 985 j = entry; 986 } else { 987 (void) free_slot_by_index(j); 988 } 989 if ((FINFO[j].caller_addr = netbufdup(caller_addr)) == NULL) { 990 return (-1); 991 } 992 rpcb_rmtcalls++; /* no of pending calls */ 993 FINFO[j].flag = FINFO_ACTIVE; 994 FINFO[j].reply_type = reply_type; 995 FINFO[j].versnum = versnum; 996 FINFO[j].time = time_now; 997 FINFO[j].caller_xid = caller_xid; 998 FINFO[j].forward_fd = forward_fd; 999 /* 1000 * Though uaddr is not allocated here, it will still be freed 1001 * from free_slot_*(). 1002 */ 1003 FINFO[j].uaddr = uaddr; 1004 lastxid = lastxid + NFORWARD; 1005 /* Don't allow a zero xid below. */ 1006 if ((u_int32_t)(lastxid + NFORWARD) <= NFORWARD) 1007 lastxid = NFORWARD; 1008 FINFO[j].forward_xid = lastxid + j; /* encode slot */ 1009 *callxidp = FINFO[j].forward_xid; /* forward on this xid */ 1010 return (1); 1011 } 1012 1013 static struct finfo * 1014 forward_find(u_int32_t reply_xid) 1015 { 1016 int i; 1017 1018 i = reply_xid % NFORWARD; 1019 if (i < 0) 1020 i += NFORWARD; 1021 if ((FINFO[i].flag & FINFO_ACTIVE) && 1022 (FINFO[i].forward_xid == reply_xid)) { 1023 return (&FINFO[i]); 1024 } 1025 return (NULL); 1026 } 1027 1028 static int 1029 free_slot_by_xid(u_int32_t xid) 1030 { 1031 int entry; 1032 1033 entry = xid % NFORWARD; 1034 if (entry < 0) 1035 entry += NFORWARD; 1036 return (free_slot_by_index(entry)); 1037 } 1038 1039 static int 1040 free_slot_by_index(int idx) 1041 { 1042 struct finfo *fi; 1043 1044 fi = &FINFO[idx]; 1045 if (fi->flag & FINFO_ACTIVE) { 1046 netbuffree(fi->caller_addr); 1047 /* XXX may be too big, but can't access xprt array here */ 1048 if (fi->forward_fd >= *svc_fdset_getmax()) 1049 (*svc_fdset_getmax())--; 1050 free(fi->uaddr); 1051 fi->flag &= ~FINFO_ACTIVE; 1052 rpcb_rmtcalls--; 1053 return (1); 1054 } 1055 return (0); 1056 } 1057 1058 static int 1059 netbufcmp(struct netbuf *n1, struct netbuf *n2) 1060 { 1061 return ((n1->len != n2->len) || memcmp(n1->buf, n2->buf, n1->len)); 1062 } 1063 1064 static bool_t 1065 netbuf_copybuf(struct netbuf *dst, const struct netbuf *src) 1066 { 1067 assert(src->len <= src->maxlen); 1068 1069 if (dst->maxlen < src->len || dst->buf == NULL) { 1070 if (dst->buf != NULL) 1071 free(dst->buf); 1072 if ((dst->buf = calloc(1, src->maxlen)) == NULL) 1073 return (FALSE); 1074 dst->maxlen = src->maxlen; 1075 } 1076 1077 dst->len = src->len; 1078 memcpy(dst->buf, src->buf, src->len); 1079 1080 return (TRUE); 1081 } 1082 1083 static struct netbuf * 1084 netbufdup(struct netbuf *ap) 1085 { 1086 struct netbuf *np; 1087 1088 if ((np = calloc(1, sizeof(struct netbuf))) == NULL) 1089 return (NULL); 1090 if (netbuf_copybuf(np, ap) == FALSE) { 1091 free(np); 1092 return (NULL); 1093 } 1094 return (np); 1095 } 1096 1097 static void 1098 netbuffree(struct netbuf *ap) 1099 { 1100 free(ap->buf); 1101 ap->buf = NULL; 1102 free(ap); 1103 } 1104 1105 1106 #define MASKVAL (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND) 1107 extern bool_t __svc_clean_idle(fd_set *, int, bool_t); 1108 1109 void 1110 my_svc_run(void) 1111 { 1112 size_t nfds; 1113 struct pollfd *pollfds; 1114 int npollfds; 1115 int poll_ret, check_ret; 1116 int n, *m; 1117 #ifdef SVC_RUN_DEBUG 1118 int i; 1119 #endif 1120 struct pollfd *p; 1121 1122 pollfds = NULL; 1123 npollfds = 0; 1124 1125 for (;;) { 1126 if (svc_fdset_getsize(0) != npollfds) { 1127 npollfds = svc_fdset_getsize(0); 1128 pollfds = realloc(pollfds, npollfds * sizeof(*pollfds)); 1129 } 1130 p = pollfds; 1131 if (p == NULL) { 1132 out: 1133 syslog(LOG_ERR, "Cannot allocate pollfds"); 1134 sleep(1); 1135 continue; 1136 } 1137 if ((m = svc_fdset_getmax()) == NULL) 1138 goto out; 1139 for (n = 0; n <= *m; n++) { 1140 if (svc_fdset_isset(n)) { 1141 p->fd = n; 1142 p->events = MASKVAL; 1143 p++; 1144 } 1145 } 1146 nfds = p - pollfds; 1147 poll_ret = 0; 1148 #ifdef SVC_RUN_DEBUG 1149 if (debugging) { 1150 fprintf(stderr, "polling for read on fd < "); 1151 for (i = 0, p = pollfds; i < nfds; i++, p++) 1152 if (p->events) 1153 fprintf(stderr, "%d ", p->fd); 1154 fprintf(stderr, ">\n"); 1155 } 1156 #endif 1157 #ifdef RPCBIND_RUMP 1158 poll_ret = rump_sys_poll(pollfds, nfds, 30 * 1000); 1159 #else 1160 poll_ret = poll(pollfds, nfds, 30 * 1000); 1161 #endif 1162 switch (poll_ret) { 1163 case -1: 1164 /* 1165 * We ignore all errors, continuing with the assumption 1166 * that it was set by the signal handlers (or any 1167 * other outside event) and not caused by poll(). 1168 */ 1169 #ifdef SVC_RUN_DEBUG 1170 if (debugging) { 1171 fprintf(stderr, "poll returned %d (%s)\n", 1172 poll_ret, strerror(errno)); 1173 } 1174 #endif 1175 case 0: 1176 __svc_clean_idle(NULL, 30, FALSE); 1177 continue; 1178 default: 1179 #ifdef SVC_RUN_DEBUG 1180 if (debugging) { 1181 fprintf(stderr, "poll returned read fds < "); 1182 for (i = 0, p = pollfds; i < nfds; i++, p++) 1183 if (p->revents) 1184 fprintf(stderr, "%d (%#x)", 1185 p->fd, p->revents); 1186 fprintf(stderr, ">\n"); 1187 } 1188 #endif 1189 /* 1190 * If we found as many replies on callback fds 1191 * as the number of descriptors selectable which 1192 * poll() returned, there can be no more so we 1193 * don't call svc_getreq_poll. Otherwise, there 1194 * must be another so we must call svc_getreq_poll. 1195 */ 1196 if ((check_ret = check_rmtcalls(pollfds, nfds)) == 1197 poll_ret) 1198 continue; 1199 svc_getreq_poll(pollfds, poll_ret-check_ret); 1200 } 1201 #ifdef SVC_RUN_DEBUG 1202 if (debugging) { 1203 fprintf(stderr, "svc_maxfd now %u\n", 1204 *svc_fdset_getmax()); 1205 } 1206 #endif 1207 } 1208 } 1209 1210 static int 1211 check_rmtcalls(struct pollfd *pfds, int nfds) 1212 { 1213 int j, ncallbacks_found = 0, rmtcalls_pending; 1214 SVCXPRT *xprt; 1215 1216 if (rpcb_rmtcalls == 0) 1217 return (0); 1218 1219 rmtcalls_pending = rpcb_rmtcalls; 1220 for (j = 0; j < nfds; j++) { 1221 if ((xprt = find_rmtcallxprt_by_fd(pfds[j].fd)) != NULL) { 1222 if (pfds[j].revents) { 1223 ncallbacks_found++; 1224 #ifdef DEBUG_RMTCALL 1225 if (debugging) 1226 fprintf(stderr, 1227 "my_svc_run: polled on forwarding fd %d, netid %s - calling handle_reply\n", 1228 pfds[j].fd, xprt->xp_netid); 1229 #endif 1230 handle_reply(pfds[j].fd, xprt); 1231 pfds[j].revents = 0; 1232 if (ncallbacks_found >= rmtcalls_pending) { 1233 break; 1234 } 1235 } 1236 } 1237 } 1238 return (ncallbacks_found); 1239 } 1240 1241 static void 1242 xprt_set_caller(SVCXPRT *xprt, struct finfo *fi) 1243 { 1244 u_int32_t *xidp; 1245 1246 netbuf_copybuf(svc_getrpccaller(xprt), fi->caller_addr); 1247 xidp = __rpcb_get_dg_xidp(xprt); 1248 *xidp = fi->caller_xid; 1249 } 1250 1251 /* 1252 * Call svcerr_systemerr() only if RPCBVERS4 1253 */ 1254 static void 1255 send_svcsyserr(SVCXPRT *xprt, struct finfo *fi) 1256 { 1257 if (fi->reply_type == RPCBPROC_INDIRECT) { 1258 xprt_set_caller(xprt, fi); 1259 svcerr_systemerr(xprt); 1260 } 1261 return; 1262 } 1263 1264 static void 1265 handle_reply(int fd, SVCXPRT *xprt) 1266 { 1267 XDR reply_xdrs; 1268 struct rpc_msg reply_msg; 1269 struct rpc_err reply_error; 1270 char *buffer; 1271 struct finfo *fi; 1272 int inlen, pos, len; 1273 struct r_rmtcall_args a; 1274 struct sockaddr_storage ss; 1275 socklen_t fromlen; 1276 #ifdef SVC_RUN_DEBUG 1277 char *uaddr; 1278 #endif 1279 1280 buffer = malloc(RPC_BUF_MAX); 1281 if (buffer == NULL) 1282 goto done; 1283 1284 do { 1285 fromlen = sizeof(ss); 1286 inlen = recvfrom(fd, buffer, RPC_BUF_MAX, 0, 1287 (struct sockaddr *)&ss, &fromlen); 1288 } while (inlen < 0 && errno == EINTR); 1289 if (inlen < 0) { 1290 if (debugging) 1291 fprintf(stderr, 1292 "handle_reply: recvfrom returned %d, errno %d\n", inlen, errno); 1293 goto done; 1294 } 1295 1296 reply_msg.acpted_rply.ar_verf = _null_auth; 1297 reply_msg.acpted_rply.ar_results.where = 0; 1298 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 1299 1300 xdrmem_create(&reply_xdrs, buffer, (u_int)inlen, XDR_DECODE); 1301 if (!xdr_replymsg(&reply_xdrs, &reply_msg)) { 1302 if (debugging) 1303 (void) fprintf(stderr, 1304 "handle_reply: xdr_replymsg failed\n"); 1305 goto done; 1306 } 1307 fi = forward_find(reply_msg.rm_xid); 1308 #ifdef SVC_RUN_DEBUG 1309 if (debugging) { 1310 fprintf(stderr, "handle_reply: reply xid: %d fi addr: %p\n", 1311 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 (void) fprintf(stderr, "handle_reply: %s\n", 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, "handle_reply: forwarding address %s to %s\n", 1338 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, "handle_reply: NULL xid on exit!\n"); 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