1 /* $NetBSD: rpcb_svc_com.c,v 1.9 2002/11/08 00:16:39 fvdl Exp $ */ 2 /* $FreeBSD$ */ 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/poll.h> 46 #include <sys/socket.h> 47 #include <rpc/rpc.h> 48 #include <rpc/rpcb_prot.h> 49 #include <rpc/svc_dg.h> 50 #include <assert.h> 51 #include <netconfig.h> 52 #include <errno.h> 53 #include <syslog.h> 54 #include <unistd.h> 55 #include <stdio.h> 56 #ifdef PORTMAP 57 #include <netinet/in.h> 58 #include <rpc/rpc_com.h> 59 #include <rpc/pmap_prot.h> 60 #endif /* PORTMAP */ 61 #include <string.h> 62 #include <stdlib.h> 63 64 #include "rpcbind.h" 65 66 #define RPC_BUF_MAX 65536 /* can be raised if required */ 67 68 static char *nullstring = ""; 69 static int rpcb_rmtcalls; 70 71 struct rmtcallfd_list { 72 int fd; 73 SVCXPRT *xprt; 74 char *netid; 75 struct rmtcallfd_list *next; 76 }; 77 78 #define NFORWARD 64 79 #define MAXTIME_OFF 300 /* 5 minutes */ 80 81 struct finfo { 82 int flag; 83 #define FINFO_ACTIVE 0x1 84 u_int32_t caller_xid; 85 struct netbuf *caller_addr; 86 u_int32_t forward_xid; 87 int forward_fd; 88 char *uaddr; 89 rpcproc_t reply_type; 90 rpcvers_t versnum; 91 time_t time; 92 }; 93 static struct finfo FINFO[NFORWARD]; 94 95 96 static bool_t xdr_encap_parms(XDR *, struct encap_parms *); 97 static bool_t xdr_rmtcall_args(XDR *, struct r_rmtcall_args *); 98 static bool_t xdr_rmtcall_result(XDR *, struct r_rmtcall_args *); 99 static bool_t xdr_opaque_parms(XDR *, struct r_rmtcall_args *); 100 static int find_rmtcallfd_by_netid(char *); 101 static SVCXPRT *find_rmtcallxprt_by_fd(int); 102 static int forward_register(u_int32_t, struct netbuf *, int, char *, 103 rpcproc_t, rpcvers_t, u_int32_t *); 104 static struct finfo *forward_find(u_int32_t); 105 static int free_slot_by_xid(u_int32_t); 106 static int free_slot_by_index(int); 107 static int netbufcmp(struct netbuf *, struct netbuf *); 108 static struct netbuf *netbufdup(struct netbuf *); 109 static void netbuffree(struct netbuf *); 110 static int check_rmtcalls(struct pollfd *, int); 111 static void xprt_set_caller(SVCXPRT *, struct finfo *); 112 static void send_svcsyserr(SVCXPRT *, struct finfo *); 113 static void handle_reply(int, SVCXPRT *); 114 static void find_versions(rpcprog_t, char *, rpcvers_t *, rpcvers_t *); 115 static rpcblist_ptr find_service(rpcprog_t, rpcvers_t, char *); 116 static char *getowner(SVCXPRT *, char *, size_t); 117 static int add_pmaplist(RPCB *); 118 static int del_pmaplist(RPCB *); 119 120 /* 121 * Set a mapping of program, version, netid 122 */ 123 /* ARGSUSED */ 124 void * 125 rpcbproc_set_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 126 rpcvers_t rpcbversnum) 127 { 128 RPCB *regp = (RPCB *)arg; 129 static bool_t ans; 130 char owner[64]; 131 132 #ifdef RPCBIND_DEBUG 133 if (debugging) 134 fprintf(stderr, "RPCB_SET request for (%lu, %lu, %s, %s) : ", 135 (unsigned long)regp->r_prog, (unsigned long)regp->r_vers, 136 regp->r_netid, regp->r_addr); 137 #endif 138 ans = map_set(regp, getowner(transp, owner, sizeof owner)); 139 #ifdef RPCBIND_DEBUG 140 if (debugging) 141 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 142 #endif 143 /* XXX: should have used some defined constant here */ 144 rpcbs_set(rpcbversnum - 2, ans); 145 return (void *)&ans; 146 } 147 148 bool_t 149 map_set(RPCB *regp, char *owner) 150 { 151 RPCB reg, *a; 152 rpcblist_ptr rbl, fnd; 153 154 reg = *regp; 155 /* 156 * check to see if already used 157 * find_service returns a hit even if 158 * the versions don't match, so check for it 159 */ 160 fnd = find_service(reg.r_prog, reg.r_vers, reg.r_netid); 161 if (fnd && (fnd->rpcb_map.r_vers == reg.r_vers)) { 162 if (!strcmp(fnd->rpcb_map.r_addr, reg.r_addr)) 163 /* 164 * if these match then it is already 165 * registered so just say "OK". 166 */ 167 return (TRUE); 168 else 169 return (FALSE); 170 } 171 /* 172 * add to the end of the list 173 */ 174 rbl = malloc(sizeof (RPCBLIST)); 175 if (rbl == NULL) 176 return (FALSE); 177 a = &(rbl->rpcb_map); 178 a->r_prog = reg.r_prog; 179 a->r_vers = reg.r_vers; 180 a->r_netid = strdup(reg.r_netid); 181 a->r_addr = strdup(reg.r_addr); 182 a->r_owner = strdup(owner); 183 if (!a->r_addr || !a->r_netid || !a->r_owner) { 184 if (a->r_netid) 185 free(a->r_netid); 186 if (a->r_addr) 187 free(a->r_addr); 188 if (a->r_owner) 189 free(a->r_owner); 190 free(rbl); 191 return (FALSE); 192 } 193 rbl->rpcb_next = (rpcblist_ptr)NULL; 194 if (list_rbl == NULL) { 195 list_rbl = rbl; 196 } else { 197 for (fnd = list_rbl; fnd->rpcb_next; 198 fnd = fnd->rpcb_next) 199 ; 200 fnd->rpcb_next = rbl; 201 } 202 #ifdef PORTMAP 203 (void) add_pmaplist(regp); 204 #endif 205 return (TRUE); 206 } 207 208 /* 209 * Unset a mapping of program, version, netid 210 */ 211 /* ARGSUSED */ 212 void * 213 rpcbproc_unset_com(void *arg, struct svc_req *rqstp __unused, SVCXPRT *transp, 214 rpcvers_t rpcbversnum) 215 { 216 RPCB *regp = (RPCB *)arg; 217 static bool_t ans; 218 char owner[64]; 219 220 #ifdef RPCBIND_DEBUG 221 if (debugging) 222 fprintf(stderr, "RPCB_UNSET request for (%lu, %lu, %s) : ", 223 (unsigned long)regp->r_prog, (unsigned long)regp->r_vers, 224 regp->r_netid); 225 #endif 226 ans = map_unset(regp, getowner(transp, owner, sizeof owner)); 227 #ifdef RPCBIND_DEBUG 228 if (debugging) 229 fprintf(stderr, "%s\n", ans == TRUE ? "succeeded" : "failed"); 230 #endif 231 /* XXX: should have used some defined constant here */ 232 rpcbs_unset(rpcbversnum - 2, ans); 233 return (void *)&ans; 234 } 235 236 bool_t 237 map_unset(RPCB *regp, char *owner) 238 { 239 int ans = 0; 240 rpcblist_ptr rbl, prev, tmp; 241 242 if (owner == NULL) 243 return (0); 244 245 for (prev = NULL, rbl = list_rbl; rbl; /* cstyle */) { 246 if ((rbl->rpcb_map.r_prog != regp->r_prog) || 247 (rbl->rpcb_map.r_vers != regp->r_vers) || 248 (regp->r_netid[0] && strcasecmp(regp->r_netid, 249 rbl->rpcb_map.r_netid))) { 250 /* both rbl & prev move forwards */ 251 prev = rbl; 252 rbl = rbl->rpcb_next; 253 continue; 254 } 255 /* 256 * Check whether appropriate uid. Unset only 257 * if superuser or the owner itself. 258 */ 259 if (strcmp(owner, "superuser") && 260 strcmp(rbl->rpcb_map.r_owner, owner)) 261 return (0); 262 /* found it; rbl moves forward, prev stays */ 263 ans = 1; 264 tmp = rbl; 265 rbl = rbl->rpcb_next; 266 if (prev == NULL) 267 list_rbl = rbl; 268 else 269 prev->rpcb_next = rbl; 270 free(tmp->rpcb_map.r_addr); 271 free(tmp->rpcb_map.r_netid); 272 free(tmp->rpcb_map.r_owner); 273 free(tmp); 274 } 275 #ifdef PORTMAP 276 if (ans) 277 (void) del_pmaplist(regp); 278 #endif 279 /* 280 * We return 1 either when the entry was not there or it 281 * was able to unset it. It can come to this point only if 282 * atleast one of the conditions is true. 283 */ 284 return (1); 285 } 286 287 void 288 delete_prog(unsigned int prog) 289 { 290 RPCB reg; 291 register rpcblist_ptr rbl; 292 293 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 294 if ((rbl->rpcb_map.r_prog != prog)) 295 continue; 296 if (is_bound(rbl->rpcb_map.r_netid, rbl->rpcb_map.r_addr)) 297 continue; 298 reg.r_prog = rbl->rpcb_map.r_prog; 299 reg.r_vers = rbl->rpcb_map.r_vers; 300 reg.r_netid = strdup(rbl->rpcb_map.r_netid); 301 (void) map_unset(®, "superuser"); 302 free(reg.r_netid); 303 } 304 } 305 306 void * 307 rpcbproc_getaddr_com(RPCB *regp, struct svc_req *rqstp __unused, 308 SVCXPRT *transp, rpcvers_t rpcbversnum, rpcvers_t verstype) 309 { 310 static char *uaddr; 311 char *saddr = NULL; 312 rpcblist_ptr fnd; 313 314 if (uaddr != NULL && uaddr != nullstring) { 315 free(uaddr); 316 uaddr = NULL; 317 } 318 fnd = find_service(regp->r_prog, regp->r_vers, transp->xp_netid); 319 if (fnd && ((verstype == RPCB_ALLVERS) || 320 (regp->r_vers == fnd->rpcb_map.r_vers))) { 321 if (*(regp->r_addr) != '\0') { /* may contain a hint about */ 322 saddr = regp->r_addr; /* the interface that we */ 323 } /* should use */ 324 if (!(uaddr = mergeaddr(transp, transp->xp_netid, 325 fnd->rpcb_map.r_addr, saddr))) { 326 /* Try whatever we have */ 327 uaddr = strdup(fnd->rpcb_map.r_addr); 328 } else if (!uaddr[0]) { 329 /* 330 * The server died. Unset all versions of this prog. 331 */ 332 delete_prog(regp->r_prog); 333 uaddr = nullstring; 334 } 335 } else { 336 uaddr = nullstring; 337 } 338 #ifdef RPCBIND_DEBUG 339 if (debugging) 340 fprintf(stderr, "getaddr: %s\n", uaddr); 341 #endif 342 /* XXX: should have used some defined constant here */ 343 rpcbs_getaddr(rpcbversnum - 2, regp->r_prog, regp->r_vers, 344 transp->xp_netid, uaddr); 345 return (void *)&uaddr; 346 } 347 348 /* ARGSUSED */ 349 void * 350 rpcbproc_gettime_com(void *arg __unused, struct svc_req *rqstp __unused, 351 SVCXPRT *transp __unused, rpcvers_t rpcbversnum __unused) 352 { 353 static time_t curtime; 354 355 (void) time(&curtime); 356 return (void *)&curtime; 357 } 358 359 /* 360 * Convert uaddr to taddr. Should be used only by 361 * local servers/clients. (kernel level stuff only) 362 */ 363 /* ARGSUSED */ 364 void * 365 rpcbproc_uaddr2taddr_com(void *arg, struct svc_req *rqstp __unused, 366 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 367 { 368 char **uaddrp = (char **)arg; 369 struct netconfig *nconf; 370 static struct netbuf nbuf; 371 static struct netbuf *taddr; 372 373 if (taddr) { 374 free(taddr->buf); 375 free(taddr); 376 taddr = NULL; 377 } 378 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 379 ((taddr = uaddr2taddr(nconf, *uaddrp)) == NULL)) { 380 (void) memset((char *)&nbuf, 0, sizeof (struct netbuf)); 381 return (void *)&nbuf; 382 } 383 return (void *)taddr; 384 } 385 386 /* 387 * Convert taddr to uaddr. Should be used only by 388 * local servers/clients. (kernel level stuff only) 389 */ 390 /* ARGSUSED */ 391 void * 392 rpcbproc_taddr2uaddr_com(void *arg, struct svc_req *rqstp __unused, 393 SVCXPRT *transp, rpcvers_t rpcbversnum __unused) 394 { 395 struct netbuf *taddr = (struct netbuf *)arg; 396 static char *uaddr; 397 struct netconfig *nconf; 398 399 #ifdef CHEW_FDS 400 int fd; 401 402 if ((fd = open("/dev/null", O_RDONLY)) == -1) { 403 uaddr = (char *)strerror(errno); 404 return (&uaddr); 405 } 406 #endif /* CHEW_FDS */ 407 if (uaddr != NULL && uaddr != nullstring) { 408 free(uaddr); 409 uaddr = NULL; 410 } 411 if (((nconf = rpcbind_get_conf(transp->xp_netid)) == NULL) || 412 ((uaddr = taddr2uaddr(nconf, taddr)) == NULL)) { 413 uaddr = nullstring; 414 } 415 return (void *)&uaddr; 416 } 417 418 419 static bool_t 420 xdr_encap_parms(XDR *xdrs, struct encap_parms *epp) 421 { 422 return (xdr_bytes(xdrs, &(epp->args), (u_int *) &(epp->arglen), 423 RPC_MAXDATASIZE)); 424 } 425 426 /* 427 * XDR remote call arguments. It ignores the address part. 428 * written for XDR_DECODE direction only 429 */ 430 static bool_t 431 xdr_rmtcall_args(XDR *xdrs, struct r_rmtcall_args *cap) 432 { 433 /* does not get the address or the arguments */ 434 if (xdr_rpcprog(xdrs, &(cap->rmt_prog)) && 435 xdr_rpcvers(xdrs, &(cap->rmt_vers)) && 436 xdr_rpcproc(xdrs, &(cap->rmt_proc))) { 437 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 438 } 439 return (FALSE); 440 } 441 442 /* 443 * XDR remote call results along with the address. Ignore 444 * program number, version number and proc number. 445 * Written for XDR_ENCODE direction only. 446 */ 447 static bool_t 448 xdr_rmtcall_result(XDR *xdrs, struct r_rmtcall_args *cap) 449 { 450 bool_t result; 451 452 #ifdef PORTMAP 453 if (cap->rmt_localvers == PMAPVERS) { 454 int h1, h2, h3, h4, p1, p2; 455 u_long port; 456 457 /* interpret the universal address for TCP/IP */ 458 if (sscanf(cap->rmt_uaddr, "%d.%d.%d.%d.%d.%d", 459 &h1, &h2, &h3, &h4, &p1, &p2) != 6) 460 return (FALSE); 461 port = ((p1 & 0xff) << 8) + (p2 & 0xff); 462 result = xdr_u_long(xdrs, &port); 463 } else 464 #endif 465 if ((cap->rmt_localvers == RPCBVERS) || 466 (cap->rmt_localvers == RPCBVERS4)) { 467 result = xdr_wrapstring(xdrs, &(cap->rmt_uaddr)); 468 } else { 469 return (FALSE); 470 } 471 if (result == TRUE) 472 return (xdr_encap_parms(xdrs, &(cap->rmt_args))); 473 return (FALSE); 474 } 475 476 /* 477 * only worries about the struct encap_parms part of struct r_rmtcall_args. 478 * The arglen must already be set!! 479 */ 480 static bool_t 481 xdr_opaque_parms(XDR *xdrs, struct r_rmtcall_args *cap) 482 { 483 return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen)); 484 } 485 486 static struct rmtcallfd_list *rmthead; 487 static struct rmtcallfd_list *rmttail; 488 489 int 490 create_rmtcall_fd(struct netconfig *nconf) 491 { 492 int fd; 493 struct rmtcallfd_list *rmt; 494 SVCXPRT *xprt; 495 496 if ((fd = __rpc_nconf2fd(nconf)) == -1) { 497 if (debugging) 498 fprintf(stderr, 499 "create_rmtcall_fd: couldn't open \"%s\" (errno %d)\n", 500 nconf->nc_device, errno); 501 return (-1); 502 } 503 xprt = svc_tli_create(fd, 0, (struct t_bind *) 0, 0, 0); 504 if (xprt == NULL) { 505 if (debugging) 506 fprintf(stderr, 507 "create_rmtcall_fd: svc_tli_create failed\n"); 508 return (-1); 509 } 510 rmt = malloc(sizeof (struct rmtcallfd_list)); 511 if (rmt == NULL) { 512 syslog(LOG_ERR, "create_rmtcall_fd: no memory!"); 513 return (-1); 514 } 515 rmt->xprt = xprt; 516 rmt->netid = strdup(nconf->nc_netid); 517 xprt->xp_netid = rmt->netid; 518 rmt->fd = fd; 519 rmt->next = NULL; 520 if (rmthead == NULL) { 521 rmthead = rmt; 522 rmttail = rmt; 523 } else { 524 rmttail->next = rmt; 525 rmttail = rmt; 526 } 527 /* XXX not threadsafe */ 528 if (fd > svc_maxfd) 529 svc_maxfd = fd; 530 FD_SET(fd, &svc_fdset); 531 return (fd); 532 } 533 534 static int 535 find_rmtcallfd_by_netid(char *netid) 536 { 537 struct rmtcallfd_list *rmt; 538 539 for (rmt = rmthead; rmt != NULL; rmt = rmt->next) { 540 if (strcmp(netid, rmt->netid) == 0) { 541 return (rmt->fd); 542 } 543 } 544 return (-1); 545 } 546 547 static SVCXPRT * 548 find_rmtcallxprt_by_fd(int fd) 549 { 550 struct rmtcallfd_list *rmt; 551 552 for (rmt = rmthead; rmt != NULL; rmt = rmt->next) { 553 if (fd == rmt->fd) { 554 return (rmt->xprt); 555 } 556 } 557 return (NULL); 558 } 559 560 561 /* 562 * Call a remote procedure service. This procedure is very quiet when things 563 * go wrong. The proc is written to support broadcast rpc. In the broadcast 564 * case, a machine should shut-up instead of complain, lest the requestor be 565 * overrun with complaints at the expense of not hearing a valid reply. 566 * When receiving a request and verifying that the service exists, we 567 * 568 * receive the request 569 * 570 * open a new TLI endpoint on the same transport on which we received 571 * the original request 572 * 573 * remember the original request's XID (which requires knowing the format 574 * of the svc_dg_data structure) 575 * 576 * forward the request, with a new XID, to the requested service, 577 * remembering the XID used to send this request (for later use in 578 * reassociating the answer with the original request), the requestor's 579 * address, the file descriptor on which the forwarded request is 580 * made and the service's address. 581 * 582 * mark the file descriptor on which we anticipate receiving a reply from 583 * the service and one to select for in our private svc_run procedure 584 * 585 * At some time in the future, a reply will be received from the service to 586 * which we forwarded the request. At that time, we detect that the socket 587 * used was for forwarding (by looking through the finfo structures to see 588 * whether the fd corresponds to one of those) and call handle_reply() to 589 * 590 * receive the reply 591 * 592 * bundle the reply, along with the service's universal address 593 * 594 * create a SVCXPRT structure and use a version of svc_sendreply 595 * that allows us to specify the reply XID and destination, send the reply 596 * to the original requestor. 597 */ 598 599 void 600 rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp, 601 rpcproc_t reply_type, rpcvers_t versnum) 602 { 603 register rpcblist_ptr rbl; 604 struct netconfig *nconf; 605 struct netbuf *caller; 606 struct r_rmtcall_args a; 607 char *buf_alloc = NULL, *outbufp; 608 char *outbuf_alloc = NULL; 609 char buf[RPC_BUF_MAX], outbuf[RPC_BUF_MAX]; 610 struct netbuf *na = (struct netbuf *) NULL; 611 struct rpc_msg call_msg; 612 int outlen; 613 u_int sendsz; 614 XDR outxdr; 615 AUTH *auth; 616 int fd = -1; 617 char *uaddr, *m_uaddr = NULL, *local_uaddr = NULL; 618 u_int32_t *xidp; 619 struct __rpc_sockinfo si; 620 struct sockaddr *localsa; 621 struct netbuf tbuf; 622 623 if (!__rpc_fd2sockinfo(transp->xp_fd, &si)) { 624 if (reply_type == RPCBPROC_INDIRECT) 625 svcerr_systemerr(transp); 626 return; 627 } 628 if (si.si_socktype != SOCK_DGRAM) 629 return; /* Only datagram type accepted */ 630 sendsz = __rpc_get_t_size(si.si_af, si.si_proto, UDPMSGSIZE); 631 if (sendsz == 0) { /* data transfer not supported */ 632 if (reply_type == RPCBPROC_INDIRECT) 633 svcerr_systemerr(transp); 634 return; 635 } 636 /* 637 * Should be multiple of 4 for XDR. 638 */ 639 sendsz = roundup(sendsz, 4); 640 if (sendsz > RPC_BUF_MAX) { 641 #ifdef notyet 642 buf_alloc = alloca(sendsz); /* not in IDR2? */ 643 #else 644 buf_alloc = malloc(sendsz); 645 #endif /* notyet */ 646 if (buf_alloc == NULL) { 647 if (debugging) 648 fprintf(stderr, 649 "rpcbproc_callit_com: No Memory!\n"); 650 if (reply_type == RPCBPROC_INDIRECT) 651 svcerr_systemerr(transp); 652 return; 653 } 654 a.rmt_args.args = buf_alloc; 655 } else { 656 a.rmt_args.args = buf; 657 } 658 659 call_msg.rm_xid = 0; /* For error checking purposes */ 660 if (!svc_getargs(transp, (xdrproc_t) xdr_rmtcall_args, (char *) &a)) { 661 if (reply_type == RPCBPROC_INDIRECT) 662 svcerr_decode(transp); 663 if (debugging) 664 fprintf(stderr, 665 "rpcbproc_callit_com: svc_getargs failed\n"); 666 goto error; 667 } 668 669 if (!check_callit(transp, &a, versnum)) { 670 svcerr_weakauth(transp); 671 goto error; 672 } 673 674 caller = svc_getrpccaller(transp); 675 #ifdef RPCBIND_DEBUG 676 if (debugging) { 677 uaddr = taddr2uaddr(rpcbind_get_conf(transp->xp_netid), caller); 678 fprintf(stderr, "%s %s req for (%lu, %lu, %lu, %s) from %s : ", 679 versnum == PMAPVERS ? "pmap_rmtcall" : 680 versnum == RPCBVERS ? "rpcb_rmtcall" : 681 versnum == RPCBVERS4 ? "rpcb_indirect" : "unknown", 682 reply_type == RPCBPROC_INDIRECT ? "indirect" : "callit", 683 (unsigned long)a.rmt_prog, (unsigned long)a.rmt_vers, 684 (unsigned long)a.rmt_proc, transp->xp_netid, 685 uaddr ? uaddr : "unknown"); 686 if (uaddr) 687 free(uaddr); 688 } 689 #endif 690 691 rbl = find_service(a.rmt_prog, a.rmt_vers, transp->xp_netid); 692 693 rpcbs_rmtcall(versnum - 2, reply_type, a.rmt_prog, a.rmt_vers, 694 a.rmt_proc, transp->xp_netid, rbl); 695 696 if (rbl == (rpcblist_ptr)NULL) { 697 #ifdef RPCBIND_DEBUG 698 if (debugging) 699 fprintf(stderr, "not found\n"); 700 #endif 701 if (reply_type == RPCBPROC_INDIRECT) 702 svcerr_noprog(transp); 703 goto error; 704 } 705 if (rbl->rpcb_map.r_vers != a.rmt_vers) { 706 if (reply_type == RPCBPROC_INDIRECT) { 707 rpcvers_t vers_low, vers_high; 708 709 find_versions(a.rmt_prog, transp->xp_netid, 710 &vers_low, &vers_high); 711 svcerr_progvers(transp, vers_low, vers_high); 712 } 713 goto error; 714 } 715 716 #ifdef RPCBIND_DEBUG 717 if (debugging) 718 fprintf(stderr, "found at uaddr %s\n", rbl->rpcb_map.r_addr); 719 #endif 720 /* 721 * Check whether this entry is valid and a server is present 722 * Mergeaddr() returns NULL if no such entry is present, and 723 * returns "" if the entry was present but the server is not 724 * present (i.e., it crashed). 725 */ 726 if (reply_type == RPCBPROC_INDIRECT) { 727 uaddr = mergeaddr(transp, transp->xp_netid, 728 rbl->rpcb_map.r_addr, NULL); 729 if (uaddr == NULL || uaddr[0] == '\0') { 730 svcerr_noprog(transp); 731 if (uaddr != NULL) 732 free(uaddr); 733 goto error; 734 } 735 free(uaddr); 736 } 737 nconf = rpcbind_get_conf(transp->xp_netid); 738 if (nconf == (struct netconfig *)NULL) { 739 if (reply_type == RPCBPROC_INDIRECT) 740 svcerr_systemerr(transp); 741 if (debugging) 742 fprintf(stderr, 743 "rpcbproc_callit_com: rpcbind_get_conf failed\n"); 744 goto error; 745 } 746 localsa = local_sa(((struct sockaddr *)caller->buf)->sa_family); 747 if (localsa == NULL) { 748 if (debugging) 749 fprintf(stderr, 750 "rpcbproc_callit_com: no local address\n"); 751 goto error; 752 } 753 tbuf.len = tbuf.maxlen = localsa->sa_len; 754 tbuf.buf = localsa; 755 local_uaddr = 756 addrmerge(&tbuf, rbl->rpcb_map.r_addr, NULL, nconf->nc_netid); 757 m_uaddr = addrmerge(caller, rbl->rpcb_map.r_addr, NULL, 758 nconf->nc_netid); 759 #ifdef RPCBIND_DEBUG 760 if (debugging) 761 fprintf(stderr, "merged uaddr %s\n", m_uaddr); 762 #endif 763 if ((fd = find_rmtcallfd_by_netid(nconf->nc_netid)) == -1) { 764 if (reply_type == RPCBPROC_INDIRECT) 765 svcerr_systemerr(transp); 766 goto error; 767 } 768 xidp = __rpcb_get_dg_xidp(transp); 769 switch (forward_register(*xidp, caller, fd, m_uaddr, reply_type, 770 versnum, &call_msg.rm_xid)) { 771 case 1: 772 /* Success; forward_register() will free m_uaddr for us. */ 773 m_uaddr = NULL; 774 break; 775 case 0: 776 /* 777 * A duplicate request for the slow server. Let's not 778 * beat on it any more. 779 */ 780 if (debugging) 781 fprintf(stderr, 782 "rpcbproc_callit_com: duplicate request\n"); 783 goto error; 784 case -1: 785 /* forward_register failed. Perhaps no memory. */ 786 if (debugging) 787 fprintf(stderr, 788 "rpcbproc_callit_com: forward_register failed\n"); 789 goto error; 790 } 791 792 #ifdef DEBUG_RMTCALL 793 if (debugging) 794 fprintf(stderr, 795 "rpcbproc_callit_com: original XID %x, new XID %x\n", 796 *xidp, call_msg.rm_xid); 797 #endif 798 call_msg.rm_direction = CALL; 799 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; 800 call_msg.rm_call.cb_prog = a.rmt_prog; 801 call_msg.rm_call.cb_vers = a.rmt_vers; 802 if (sendsz > RPC_BUF_MAX) { 803 #ifdef notyet 804 outbuf_alloc = alloca(sendsz); /* not in IDR2? */ 805 #else 806 outbuf_alloc = malloc(sendsz); 807 #endif /* notyet */ 808 if (outbuf_alloc == NULL) { 809 if (reply_type == RPCBPROC_INDIRECT) 810 svcerr_systemerr(transp); 811 if (debugging) 812 fprintf(stderr, 813 "rpcbproc_callit_com: No memory!\n"); 814 goto error; 815 } 816 xdrmem_create(&outxdr, outbuf_alloc, sendsz, XDR_ENCODE); 817 } else { 818 xdrmem_create(&outxdr, outbuf, sendsz, XDR_ENCODE); 819 } 820 if (!xdr_callhdr(&outxdr, &call_msg)) { 821 if (reply_type == RPCBPROC_INDIRECT) 822 svcerr_systemerr(transp); 823 if (debugging) 824 fprintf(stderr, 825 "rpcbproc_callit_com: xdr_callhdr failed\n"); 826 goto error; 827 } 828 if (!xdr_u_int32_t(&outxdr, &(a.rmt_proc))) { 829 if (reply_type == RPCBPROC_INDIRECT) 830 svcerr_systemerr(transp); 831 if (debugging) 832 fprintf(stderr, 833 "rpcbproc_callit_com: xdr_u_long failed\n"); 834 goto error; 835 } 836 837 if (rqstp->rq_cred.oa_flavor == AUTH_NULL) { 838 auth = authnone_create(); 839 } else if (rqstp->rq_cred.oa_flavor == AUTH_SYS) { 840 struct authunix_parms *au; 841 842 au = (struct authunix_parms *)rqstp->rq_clntcred; 843 auth = authunix_create(au->aup_machname, 844 au->aup_uid, au->aup_gid, 845 au->aup_len, au->aup_gids); 846 if (auth == NULL) /* fall back */ 847 auth = authnone_create(); 848 } else { 849 /* we do not support any other authentication scheme */ 850 if (debugging) 851 fprintf(stderr, 852 "rpcbproc_callit_com: oa_flavor != AUTH_NONE and oa_flavor != AUTH_SYS\n"); 853 if (reply_type == RPCBPROC_INDIRECT) 854 svcerr_weakauth(transp); /* XXX too strong.. */ 855 goto error; 856 } 857 if (auth == NULL) { 858 if (reply_type == RPCBPROC_INDIRECT) 859 svcerr_systemerr(transp); 860 if (debugging) 861 fprintf(stderr, 862 "rpcbproc_callit_com: authwhatever_create returned NULL\n"); 863 goto error; 864 } 865 if (!AUTH_MARSHALL(auth, &outxdr)) { 866 if (reply_type == RPCBPROC_INDIRECT) 867 svcerr_systemerr(transp); 868 AUTH_DESTROY(auth); 869 if (debugging) 870 fprintf(stderr, 871 "rpcbproc_callit_com: AUTH_MARSHALL failed\n"); 872 goto error; 873 } 874 AUTH_DESTROY(auth); 875 if (!xdr_opaque_parms(&outxdr, &a)) { 876 if (reply_type == RPCBPROC_INDIRECT) 877 svcerr_systemerr(transp); 878 if (debugging) 879 fprintf(stderr, 880 "rpcbproc_callit_com: xdr_opaque_parms failed\n"); 881 goto error; 882 } 883 outlen = (int) XDR_GETPOS(&outxdr); 884 if (outbuf_alloc) 885 outbufp = outbuf_alloc; 886 else 887 outbufp = outbuf; 888 889 na = uaddr2taddr(nconf, local_uaddr); 890 if (!na) { 891 if (reply_type == RPCBPROC_INDIRECT) 892 svcerr_systemerr(transp); 893 goto error; 894 } 895 896 if (sendto(fd, outbufp, outlen, 0, (struct sockaddr *)na->buf, na->len) 897 != outlen) { 898 if (debugging) 899 fprintf(stderr, 900 "rpcbproc_callit_com: sendto failed: errno %d\n", errno); 901 if (reply_type == RPCBPROC_INDIRECT) 902 svcerr_systemerr(transp); 903 goto error; 904 } 905 goto out; 906 907 error: 908 if (call_msg.rm_xid != 0) 909 (void) free_slot_by_xid(call_msg.rm_xid); 910 out: 911 if (local_uaddr) 912 free(local_uaddr); 913 if (buf_alloc) 914 free(buf_alloc); 915 if (outbuf_alloc) 916 free(outbuf_alloc); 917 if (na) { 918 free(na->buf); 919 free(na); 920 } 921 if (m_uaddr != NULL) 922 free(m_uaddr); 923 } 924 925 /* 926 * Makes an entry into the FIFO for the given request. 927 * Returns 1 on success, 0 if this is a duplicate request, or -1 on error. 928 * *callxidp is set to the xid of the call. 929 */ 930 static int 931 forward_register(u_int32_t caller_xid, struct netbuf *caller_addr, 932 int forward_fd, char *uaddr, rpcproc_t reply_type, 933 rpcvers_t versnum, u_int32_t *callxidp) 934 { 935 int i; 936 int j = 0; 937 time_t min_time, time_now; 938 static u_int32_t lastxid; 939 int entry = -1; 940 941 min_time = FINFO[0].time; 942 time_now = time((time_t *)0); 943 /* initialization */ 944 if (lastxid == 0) 945 lastxid = time_now * NFORWARD; 946 947 /* 948 * Check if it is a duplicate entry. Then, 949 * try to find an empty slot. If not available, then 950 * use the slot with the earliest time. 951 */ 952 for (i = 0; i < NFORWARD; i++) { 953 if (FINFO[i].flag & FINFO_ACTIVE) { 954 if ((FINFO[i].caller_xid == caller_xid) && 955 (FINFO[i].reply_type == reply_type) && 956 (FINFO[i].versnum == versnum) && 957 (!netbufcmp(FINFO[i].caller_addr, 958 caller_addr))) { 959 FINFO[i].time = time((time_t *)0); 960 return (0); /* Duplicate entry */ 961 } else { 962 /* Should we wait any longer */ 963 if ((time_now - FINFO[i].time) > MAXTIME_OFF) 964 (void) free_slot_by_index(i); 965 } 966 } 967 if (entry == -1) { 968 if ((FINFO[i].flag & FINFO_ACTIVE) == 0) { 969 entry = i; 970 } else if (FINFO[i].time < min_time) { 971 j = i; 972 min_time = FINFO[i].time; 973 } 974 } 975 } 976 if (entry != -1) { 977 /* use this empty slot */ 978 j = entry; 979 } else { 980 (void) free_slot_by_index(j); 981 } 982 if ((FINFO[j].caller_addr = netbufdup(caller_addr)) == NULL) { 983 return (-1); 984 } 985 rpcb_rmtcalls++; /* no of pending calls */ 986 FINFO[j].flag = FINFO_ACTIVE; 987 FINFO[j].reply_type = reply_type; 988 FINFO[j].versnum = versnum; 989 FINFO[j].time = time_now; 990 FINFO[j].caller_xid = caller_xid; 991 FINFO[j].forward_fd = forward_fd; 992 /* 993 * Though uaddr is not allocated here, it will still be freed 994 * from free_slot_*(). 995 */ 996 FINFO[j].uaddr = uaddr; 997 lastxid = lastxid + NFORWARD; 998 /* Don't allow a zero xid below. */ 999 if ((u_int32_t)(lastxid + NFORWARD) <= NFORWARD) 1000 lastxid = NFORWARD; 1001 FINFO[j].forward_xid = lastxid + j; /* encode slot */ 1002 *callxidp = FINFO[j].forward_xid; /* forward on this xid */ 1003 return (1); 1004 } 1005 1006 static struct finfo * 1007 forward_find(u_int32_t reply_xid) 1008 { 1009 int i; 1010 1011 i = reply_xid % (u_int32_t)NFORWARD; 1012 if ((FINFO[i].flag & FINFO_ACTIVE) && 1013 (FINFO[i].forward_xid == reply_xid)) { 1014 return (&FINFO[i]); 1015 } 1016 return (NULL); 1017 } 1018 1019 static int 1020 free_slot_by_xid(u_int32_t xid) 1021 { 1022 int entry; 1023 1024 entry = xid % (u_int32_t)NFORWARD; 1025 return (free_slot_by_index(entry)); 1026 } 1027 1028 static int 1029 free_slot_by_index(int index) 1030 { 1031 struct finfo *fi; 1032 1033 fi = &FINFO[index]; 1034 if (fi->flag & FINFO_ACTIVE) { 1035 netbuffree(fi->caller_addr); 1036 /* XXX may be too big, but can't access xprt array here */ 1037 if (fi->forward_fd >= svc_maxfd) 1038 svc_maxfd--; 1039 free(fi->uaddr); 1040 fi->flag &= ~FINFO_ACTIVE; 1041 rpcb_rmtcalls--; 1042 return (1); 1043 } 1044 return (0); 1045 } 1046 1047 static int 1048 netbufcmp(struct netbuf *n1, struct netbuf *n2) 1049 { 1050 return ((n1->len != n2->len) || memcmp(n1->buf, n2->buf, n1->len)); 1051 } 1052 1053 static bool_t 1054 netbuf_copybuf(struct netbuf *dst, const struct netbuf *src) 1055 { 1056 assert(src->len <= src->maxlen); 1057 1058 if (dst->maxlen < src->len || dst->buf == NULL) { 1059 if (dst->buf != NULL) 1060 free(dst->buf); 1061 if ((dst->buf = calloc(1, src->maxlen)) == NULL) 1062 return (FALSE); 1063 dst->maxlen = src->maxlen; 1064 } 1065 1066 dst->len = src->len; 1067 memcpy(dst->buf, src->buf, src->len); 1068 1069 return (TRUE); 1070 } 1071 1072 static struct netbuf * 1073 netbufdup(struct netbuf *ap) 1074 { 1075 struct netbuf *np; 1076 1077 if ((np = calloc(1, sizeof(struct netbuf))) == NULL) 1078 return (NULL); 1079 if (netbuf_copybuf(np, ap) == FALSE) { 1080 free(np); 1081 return (NULL); 1082 } 1083 return (np); 1084 } 1085 1086 static void 1087 netbuffree(struct netbuf *ap) 1088 { 1089 free(ap->buf); 1090 ap->buf = NULL; 1091 free(ap); 1092 } 1093 1094 1095 #define MASKVAL (POLLIN | POLLPRI | POLLRDNORM | POLLRDBAND) 1096 extern bool_t __svc_clean_idle(fd_set *, int, bool_t); 1097 1098 void 1099 my_svc_run(void) 1100 { 1101 size_t nfds; 1102 struct pollfd pollfds[FD_SETSIZE]; 1103 int poll_ret, check_ret; 1104 int n; 1105 #ifdef SVC_RUN_DEBUG 1106 int i; 1107 #endif 1108 register struct pollfd *p; 1109 fd_set cleanfds; 1110 1111 for (;;) { 1112 p = pollfds; 1113 for (n = 0; n <= svc_maxfd; n++) { 1114 if (FD_ISSET(n, &svc_fdset)) { 1115 p->fd = n; 1116 p->events = MASKVAL; 1117 p++; 1118 } 1119 } 1120 nfds = p - pollfds; 1121 poll_ret = 0; 1122 #ifdef SVC_RUN_DEBUG 1123 if (debugging) { 1124 fprintf(stderr, "polling for read on fd < "); 1125 for (i = 0, p = pollfds; i < nfds; i++, p++) 1126 if (p->events) 1127 fprintf(stderr, "%d ", p->fd); 1128 fprintf(stderr, ">\n"); 1129 } 1130 #endif 1131 switch (poll_ret = poll(pollfds, nfds, 30 * 1000)) { 1132 case -1: 1133 /* 1134 * We ignore all errors, continuing with the assumption 1135 * that it was set by the signal handlers (or any 1136 * other outside event) and not caused by poll(). 1137 */ 1138 case 0: 1139 cleanfds = svc_fdset; 1140 __svc_clean_idle(&cleanfds, 30, FALSE); 1141 continue; 1142 default: 1143 #ifdef SVC_RUN_DEBUG 1144 if (debugging) { 1145 fprintf(stderr, "poll returned read fds < "); 1146 for (i = 0, p = pollfds; i < nfds; i++, p++) 1147 if (p->revents) 1148 fprintf(stderr, "%d ", p->fd); 1149 fprintf(stderr, ">\n"); 1150 } 1151 #endif 1152 /* 1153 * If we found as many replies on callback fds 1154 * as the number of descriptors selectable which 1155 * poll() returned, there can be no more so we 1156 * don't call svc_getreq_poll. Otherwise, there 1157 * must be another so we must call svc_getreq_poll. 1158 */ 1159 if ((check_ret = check_rmtcalls(pollfds, nfds)) == 1160 poll_ret) 1161 continue; 1162 svc_getreq_poll(pollfds, poll_ret-check_ret); 1163 } 1164 #ifdef SVC_RUN_DEBUG 1165 if (debugging) { 1166 fprintf(stderr, "svc_maxfd now %u\n", svc_maxfd); 1167 } 1168 #endif 1169 } 1170 } 1171 1172 static int 1173 check_rmtcalls(struct pollfd *pfds, int nfds) 1174 { 1175 int j, ncallbacks_found = 0, rmtcalls_pending; 1176 SVCXPRT *xprt; 1177 1178 if (rpcb_rmtcalls == 0) 1179 return (0); 1180 1181 rmtcalls_pending = rpcb_rmtcalls; 1182 for (j = 0; j < nfds; j++) { 1183 if ((xprt = find_rmtcallxprt_by_fd(pfds[j].fd)) != NULL) { 1184 if (pfds[j].revents) { 1185 ncallbacks_found++; 1186 #ifdef DEBUG_RMTCALL 1187 if (debugging) 1188 fprintf(stderr, 1189 "my_svc_run: polled on forwarding fd %d, netid %s - calling handle_reply\n", 1190 pfds[j].fd, xprt->xp_netid); 1191 #endif 1192 handle_reply(pfds[j].fd, xprt); 1193 pfds[j].revents = 0; 1194 if (ncallbacks_found >= rmtcalls_pending) { 1195 break; 1196 } 1197 } 1198 } 1199 } 1200 return (ncallbacks_found); 1201 } 1202 1203 static void 1204 xprt_set_caller(SVCXPRT *xprt, struct finfo *fi) 1205 { 1206 u_int32_t *xidp; 1207 1208 netbuf_copybuf(svc_getrpccaller(xprt), fi->caller_addr); 1209 xidp = __rpcb_get_dg_xidp(xprt); 1210 *xidp = fi->caller_xid; 1211 } 1212 1213 /* 1214 * Call svcerr_systemerr() only if RPCBVERS4 1215 */ 1216 static void 1217 send_svcsyserr(SVCXPRT *xprt, struct finfo *fi) 1218 { 1219 if (fi->reply_type == RPCBPROC_INDIRECT) { 1220 xprt_set_caller(xprt, fi); 1221 svcerr_systemerr(xprt); 1222 } 1223 return; 1224 } 1225 1226 static void 1227 handle_reply(int fd, SVCXPRT *xprt) 1228 { 1229 XDR reply_xdrs; 1230 struct rpc_msg reply_msg; 1231 struct rpc_err reply_error; 1232 char *buffer; 1233 struct finfo *fi; 1234 int inlen, pos, len; 1235 struct r_rmtcall_args a; 1236 struct sockaddr_storage ss; 1237 socklen_t fromlen; 1238 #ifdef SVC_RUN_DEBUG 1239 char *uaddr; 1240 #endif 1241 1242 buffer = malloc(RPC_BUF_MAX); 1243 if (buffer == NULL) 1244 goto done; 1245 1246 do { 1247 fromlen = sizeof(ss); 1248 inlen = recvfrom(fd, buffer, RPC_BUF_MAX, 0, 1249 (struct sockaddr *)&ss, &fromlen); 1250 } while (inlen < 0 && errno == EINTR); 1251 if (inlen < 0) { 1252 if (debugging) 1253 fprintf(stderr, 1254 "handle_reply: recvfrom returned %d, errno %d\n", inlen, errno); 1255 goto done; 1256 } 1257 1258 reply_msg.acpted_rply.ar_verf = _null_auth; 1259 reply_msg.acpted_rply.ar_results.where = 0; 1260 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void; 1261 1262 xdrmem_create(&reply_xdrs, buffer, (u_int)inlen, XDR_DECODE); 1263 if (!xdr_replymsg(&reply_xdrs, &reply_msg)) { 1264 if (debugging) 1265 (void) fprintf(stderr, 1266 "handle_reply: xdr_replymsg failed\n"); 1267 goto done; 1268 } 1269 fi = forward_find(reply_msg.rm_xid); 1270 #ifdef SVC_RUN_DEBUG 1271 if (debugging) { 1272 fprintf(stderr, "handle_reply: reply xid: %d fi addr: %p\n", 1273 reply_msg.rm_xid, fi); 1274 } 1275 #endif 1276 if (fi == NULL) { 1277 goto done; 1278 } 1279 _seterr_reply(&reply_msg, &reply_error); 1280 if (reply_error.re_status != RPC_SUCCESS) { 1281 if (debugging) 1282 (void) fprintf(stderr, "handle_reply: %s\n", 1283 clnt_sperrno(reply_error.re_status)); 1284 send_svcsyserr(xprt, fi); 1285 goto done; 1286 } 1287 pos = XDR_GETPOS(&reply_xdrs); 1288 len = inlen - pos; 1289 a.rmt_args.args = &buffer[pos]; 1290 a.rmt_args.arglen = len; 1291 a.rmt_uaddr = fi->uaddr; 1292 a.rmt_localvers = fi->versnum; 1293 1294 xprt_set_caller(xprt, fi); 1295 #ifdef SVC_RUN_DEBUG 1296 uaddr = taddr2uaddr(rpcbind_get_conf("udp"), 1297 svc_getrpccaller(xprt)); 1298 if (debugging) { 1299 fprintf(stderr, "handle_reply: forwarding address %s to %s\n", 1300 a.rmt_uaddr, uaddr ? uaddr : "unknown"); 1301 } 1302 if (uaddr) 1303 free(uaddr); 1304 #endif 1305 svc_sendreply(xprt, (xdrproc_t) xdr_rmtcall_result, (char *) &a); 1306 done: 1307 if (buffer) 1308 free(buffer); 1309 1310 if (reply_msg.rm_xid == 0) { 1311 #ifdef SVC_RUN_DEBUG 1312 if (debugging) { 1313 fprintf(stderr, "handle_reply: NULL xid on exit!\n"); 1314 } 1315 #endif 1316 } else 1317 (void) free_slot_by_xid(reply_msg.rm_xid); 1318 return; 1319 } 1320 1321 static void 1322 find_versions(rpcprog_t prog, char *netid, rpcvers_t *lowvp, rpcvers_t *highvp) 1323 { 1324 register rpcblist_ptr rbl; 1325 unsigned int lowv = 0; 1326 unsigned int highv = 0; 1327 1328 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 1329 if ((rbl->rpcb_map.r_prog != prog) || 1330 ((rbl->rpcb_map.r_netid != NULL) && 1331 (strcasecmp(rbl->rpcb_map.r_netid, netid) != 0))) 1332 continue; 1333 if (lowv == 0) { 1334 highv = rbl->rpcb_map.r_vers; 1335 lowv = highv; 1336 } else if (rbl->rpcb_map.r_vers < lowv) { 1337 lowv = rbl->rpcb_map.r_vers; 1338 } else if (rbl->rpcb_map.r_vers > highv) { 1339 highv = rbl->rpcb_map.r_vers; 1340 } 1341 } 1342 *lowvp = lowv; 1343 *highvp = highv; 1344 return; 1345 } 1346 1347 /* 1348 * returns the item with the given program, version number and netid. 1349 * If that version number is not found, it returns the item with that 1350 * program number, so that address is now returned to the caller. The 1351 * caller when makes a call to this program, version number, the call 1352 * will fail and it will return with PROGVERS_MISMATCH. The user can 1353 * then determine the highest and the lowest version number for this 1354 * program using clnt_geterr() and use those program version numbers. 1355 * 1356 * Returns the RPCBLIST for the given prog, vers and netid 1357 */ 1358 static rpcblist_ptr 1359 find_service(rpcprog_t prog, rpcvers_t vers, char *netid) 1360 { 1361 register rpcblist_ptr hit = NULL; 1362 register rpcblist_ptr rbl; 1363 1364 for (rbl = list_rbl; rbl != NULL; rbl = rbl->rpcb_next) { 1365 if ((rbl->rpcb_map.r_prog != prog) || 1366 ((rbl->rpcb_map.r_netid != NULL) && 1367 (strcasecmp(rbl->rpcb_map.r_netid, netid) != 0))) 1368 continue; 1369 hit = rbl; 1370 if (rbl->rpcb_map.r_vers == vers) 1371 break; 1372 } 1373 return (hit); 1374 } 1375 1376 /* 1377 * Copies the name associated with the uid of the caller and returns 1378 * a pointer to it. Similar to getwd(). 1379 */ 1380 static char * 1381 getowner(SVCXPRT *transp, char *owner, size_t ownersize) 1382 { 1383 uid_t uid; 1384 1385 if (__rpc_get_local_uid(transp, &uid) < 0) 1386 strlcpy(owner, "unknown", ownersize); 1387 else if (uid == 0) 1388 strlcpy(owner, "superuser", ownersize); 1389 else 1390 snprintf(owner, ownersize, "%d", uid); 1391 1392 return owner; 1393 } 1394 1395 #ifdef PORTMAP 1396 /* 1397 * Add this to the pmap list only if it is UDP or TCP. 1398 */ 1399 static int 1400 add_pmaplist(RPCB *arg) 1401 { 1402 struct pmap pmap; 1403 struct pmaplist *pml; 1404 int h1, h2, h3, h4, p1, p2; 1405 1406 if (strcmp(arg->r_netid, udptrans) == 0) { 1407 /* It is UDP! */ 1408 pmap.pm_prot = IPPROTO_UDP; 1409 } else if (strcmp(arg->r_netid, tcptrans) == 0) { 1410 /* It is TCP */ 1411 pmap.pm_prot = IPPROTO_TCP; 1412 } else 1413 /* Not an IP protocol */ 1414 return (0); 1415 1416 /* interpret the universal address for TCP/IP */ 1417 if (sscanf(arg->r_addr, "%d.%d.%d.%d.%d.%d", 1418 &h1, &h2, &h3, &h4, &p1, &p2) != 6) 1419 return (0); 1420 pmap.pm_port = ((p1 & 0xff) << 8) + (p2 & 0xff); 1421 pmap.pm_prog = arg->r_prog; 1422 pmap.pm_vers = arg->r_vers; 1423 /* 1424 * add to END of list 1425 */ 1426 pml = malloc(sizeof (struct pmaplist)); 1427 if (pml == NULL) { 1428 (void) syslog(LOG_ERR, "rpcbind: no memory!\n"); 1429 return (1); 1430 } 1431 pml->pml_map = pmap; 1432 pml->pml_next = NULL; 1433 if (list_pml == NULL) { 1434 list_pml = pml; 1435 } else { 1436 struct pmaplist *fnd; 1437 1438 /* Attach to the end of the list */ 1439 for (fnd = list_pml; fnd->pml_next; fnd = fnd->pml_next) 1440 ; 1441 fnd->pml_next = pml; 1442 } 1443 return (0); 1444 } 1445 1446 /* 1447 * Delete this from the pmap list only if it is UDP or TCP. 1448 */ 1449 static int 1450 del_pmaplist(RPCB *arg) 1451 { 1452 struct pmaplist *pml; 1453 struct pmaplist *prevpml, *fnd; 1454 unsigned long prot; 1455 1456 if (strcmp(arg->r_netid, udptrans) == 0) { 1457 /* It is UDP! */ 1458 prot = IPPROTO_UDP; 1459 } else if (strcmp(arg->r_netid, tcptrans) == 0) { 1460 /* It is TCP */ 1461 prot = IPPROTO_TCP; 1462 } else if (arg->r_netid[0] == 0) { 1463 prot = 0; /* Remove all occurrences */ 1464 } else { 1465 /* Not an IP protocol */ 1466 return (0); 1467 } 1468 for (prevpml = NULL, pml = list_pml; pml; /* cstyle */) { 1469 if ((pml->pml_map.pm_prog != arg->r_prog) || 1470 (pml->pml_map.pm_vers != arg->r_vers) || 1471 (prot && (pml->pml_map.pm_prot != prot))) { 1472 /* both pml & prevpml move forwards */ 1473 prevpml = pml; 1474 pml = pml->pml_next; 1475 continue; 1476 } 1477 /* found it; pml moves forward, prevpml stays */ 1478 fnd = pml; 1479 pml = pml->pml_next; 1480 if (prevpml == NULL) 1481 list_pml = pml; 1482 else 1483 prevpml->pml_next = pml; 1484 free(fnd); 1485 } 1486 return (0); 1487 } 1488 #endif /* PORTMAP */ 1489