lib/libc/rpc/rpc_generic.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  * @(#)rpc_generic.c    1.17    94/04/24 SMI
  29  * $NetBSD: rpc_generic.c,v 1.4 2000/09/28 09:07:04 kleink Exp $
  30  * $FreeBSD: src/lib/libc/rpc/rpc_generic.c,v 1.14 2007/09/20 22:35:24 matteo Exp $
  31  */
  32 /*
  33  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  34  */
  35
  36 /*
  37  * rpc_generic.c, Misc routines for RPC.
  38  *
  39  */
  40
  41 #include "namespace.h"
  42 #include "reentrant.h"
  43 #include <sys/types.h>
  44 #include <sys/param.h>
  45 #include <sys/socket.h>
  46 #include <sys/time.h>
  47 #include <sys/un.h>
  48 #include <sys/resource.h>
  49 #include <netinet/in.h>
  50 #include <arpa/inet.h>
  51 #include <rpc/rpc.h>
  52 #include <ctype.h>
  53 #include <stddef.h>
  54 #include <stdio.h>
  55 #include <netdb.h>
  56 #include <netconfig.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <syslog.h>
  60 #include <rpc/nettype.h>
  61 #include "un-namespace.h"
  62 #include "rpc_com.h"
  63 #include "mt_misc.h"
  64
  65 struct handle {
  66         NCONF_HANDLE *nhandle;
  67         int nflag;              /* Whether NETPATH or NETCONFIG */
  68         int nettype;
  69 };
  70
  71 static const struct _rpcnettype {
  72         const char *name;
  73         const int type;
  74 } _rpctypelist[] = {
  75         { "netpath", _RPC_NETPATH },
  76         { "visible", _RPC_VISIBLE },
  77         { "circuit_v", _RPC_CIRCUIT_V },
  78         { "datagram_v", _RPC_DATAGRAM_V },
  79         { "circuit_n", _RPC_CIRCUIT_N },
  80         { "datagram_n", _RPC_DATAGRAM_N },
  81         { "tcp", _RPC_TCP },
  82         { "udp", _RPC_UDP },
  83         { 0, _RPC_NONE }
  84 };
  85
  86 struct netid_af {
  87         const char      *netid;
  88         int             af;
  89         int             protocol;
  90 };
  91
  92 static const struct netid_af na_cvt[] = {
  93         { "udp",  AF_INET,  IPPROTO_UDP },
  94         { "tcp",  AF_INET,  IPPROTO_TCP },
  95 #ifdef INET6
  96         { "udp6", AF_INET6, IPPROTO_UDP },
  97         { "tcp6", AF_INET6, IPPROTO_TCP },
  98 #endif
  99         { "local", AF_LOCAL, 0 }
 100 };
 101
 102 #if 0
 103 static char *strlocase(char *);
 104 #endif
 105 static int getnettype(const char *);
 106
 107 /*
 108  * Cache the result of getrlimit(), so we don't have to do an
 109  * expensive call every time.
 110  */
 111 int
 112 __rpc_dtbsize(void)
 113 {
 114         static int tbsize;
 115         struct rlimit rl;
 116
 117         if (tbsize) {
 118                 return (tbsize);
 119         }
 120         if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
 121                 return (tbsize = (int)rl.rlim_max);
 122         }
 123         /*
 124          * Something wrong.  I'll try to save face by returning a
 125          * pessimistic number.
 126          */
 127         return (32);
 128 }
 129
 130
 131 /*
 132  * Find the appropriate buffer size
 133  */
 134 u_int
 135 /*ARGSUSED*/
 136 __rpc_get_t_size(int af, int proto,
 137                  int size)      /* Size requested */
 138 {
 139         int maxsize, defsize;
 140
 141         maxsize = 256 * 1024;   /* XXX */
 142         switch (proto) {
 143         case IPPROTO_TCP:
 144                 defsize = 64 * 1024;    /* XXX */
 145                 break;
 146         case IPPROTO_UDP:
 147                 defsize = UDPMSGSIZE;
 148                 break;
 149         default:
 150                 defsize = RPC_MAXDATASIZE;
 151                 break;
 152         }
 153         if (size == 0)
 154                 return defsize;
 155
 156         /* Check whether the value is within the upper max limit */
 157         return (size > maxsize ? (u_int)maxsize : (u_int)size);
 158 }
 159
 160 /*
 161  * Find the appropriate address buffer size
 162  */
 163 u_int
 164 __rpc_get_a_size(int af)
 165 {
 166         switch (af) {
 167         case AF_INET:
 168                 return sizeof (struct sockaddr_in);
 169 #ifdef INET6
 170         case AF_INET6:
 171                 return sizeof (struct sockaddr_in6);
 172 #endif
 173         case AF_LOCAL:
 174                 return sizeof (struct sockaddr_un);
 175         default:
 176                 break;
 177         }
 178         return ((u_int)RPC_MAXADDRSIZE);
 179 }
 180
 181 #if 0
 182 static char *
 183 strlocase(char *p)
 184 {
 185         char *t = p;
 186
 187         for (; *p; p++)
 188                 if (isupper(*p))
 189                         *p = tolower(*p);
 190         return (t);
 191 }
 192 #endif
 193
 194 /*
 195  * Returns the type of the network as defined in <rpc/nettype.h>
 196  * If nettype is NULL, it defaults to NETPATH.
 197  */
 198 static int
 199 getnettype(const char *nettype)
 200 {
 201         int i;
 202
 203         if ((nettype == NULL) || (nettype[0] == 0)) {
 204                 return (_RPC_NETPATH);  /* Default */
 205         }
 206
 207 #if 0
 208         nettype = strlocase(nettype);
 209 #endif
 210         for (i = 0; _rpctypelist[i].name; i++)
 211                 if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
 212                         return (_rpctypelist[i].type);
 213                 }
 214         return (_rpctypelist[i].type);
 215 }
 216
 217 /*
 218  * For the given nettype (tcp or udp only), return the first structure found.
 219  * This should be freed by calling freenetconfigent()
 220  */
 221 struct netconfig *
 222 __rpc_getconfip(const char *nettype)
 223 {
 224         char *netid;
 225         char *netid_tcp = NULL;
 226         char *netid_udp = NULL;
 227         static char *netid_tcp_main;
 228         static char *netid_udp_main;
 229         struct netconfig *dummy;
 230         int main_thread;
 231         static thread_key_t tcp_key, udp_key;
 232
 233         if ((main_thread = thr_main())) {
 234                 netid_udp = netid_udp_main;
 235                 netid_tcp = netid_tcp_main;
 236         } else {
 237                 if (tcp_key == 0) {
 238                         mutex_lock(&tsd_lock);
 239                         if (tcp_key == 0)
 240                                 thr_keycreate(&tcp_key, free);
 241                         mutex_unlock(&tsd_lock);
 242                 }
 243                 netid_tcp = (char *)thr_getspecific(tcp_key);
 244                 if (udp_key == 0) {
 245                         mutex_lock(&tsd_lock);
 246                         if (udp_key == 0)
 247                                 thr_keycreate(&udp_key, free);
 248                         mutex_unlock(&tsd_lock);
 249                 }
 250                 netid_udp = (char *)thr_getspecific(udp_key);
 251         }
 252         if (!netid_udp && !netid_tcp) {
 253                 struct netconfig *nconf;
 254                 void *confighandle;
 255
 256                 if (!(confighandle = setnetconfig())) {
 257                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 258                         return (NULL);
 259                 }
 260                 while ((nconf = getnetconfig(confighandle)) != NULL) {
 261                         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 262                                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 263                                         netid_tcp = strdup(nconf->nc_netid);
 264                                         if (main_thread)
 265                                                 netid_tcp_main = netid_tcp;
 266                                         else
 267                                                 thr_setspecific(tcp_key,
 268                                                         (void *) netid_tcp);
 269                                 } else
 270                                 if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
 271                                         netid_udp = strdup(nconf->nc_netid);
 272                                         if (main_thread)
 273                                                 netid_udp_main = netid_udp;
 274                                         else
 275                                                 thr_setspecific(udp_key,
 276                                                 (void *) netid_udp);
 277                                 }
 278                         }
 279                 }
 280                 endnetconfig(confighandle);
 281         }
 282         if (strcmp(nettype, "udp") == 0)
 283                 netid = netid_udp;
 284         else if (strcmp(nettype, "tcp") == 0)
 285                 netid = netid_tcp;
 286         else {
 287                 return (NULL);
 288         }
 289         if ((netid == NULL) || (netid[0] == 0)) {
 290                 return (NULL);
 291         }
 292         dummy = getnetconfigent(netid);
 293         return (dummy);
 294 }
 295
 296 /*
 297  * Returns the type of the nettype, which should then be used with
 298  * __rpc_getconf().
 299  */
 300 void *
 301 __rpc_setconf(const char *nettype)
 302 {
 303         struct handle *handle;
 304
 305         handle = (struct handle *) malloc(sizeof (struct handle));
 306         if (handle == NULL) {
 307                 return (NULL);
 308         }
 309         switch (handle->nettype = getnettype(nettype)) {
 310         case _RPC_NETPATH:
 311         case _RPC_CIRCUIT_N:
 312         case _RPC_DATAGRAM_N:
 313                 if (!(handle->nhandle = setnetpath()))
 314                         goto failed;
 315                 handle->nflag = TRUE;
 316                 break;
 317         case _RPC_VISIBLE:
 318         case _RPC_CIRCUIT_V:
 319         case _RPC_DATAGRAM_V:
 320         case _RPC_TCP:
 321         case _RPC_UDP:
 322                 if (!(handle->nhandle = setnetconfig())) {
 323                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 324                         goto failed;
 325                 }
 326                 handle->nflag = FALSE;
 327                 break;
 328         default:
 329                 goto failed;
 330         }
 331
 332         return (handle);
 333
 334 failed:
 335         free(handle);
 336         return (NULL);
 337 }
 338
 339 /*
 340  * Returns the next netconfig struct for the given "net" type.
 341  * __rpc_setconf() should have been called previously.
 342  */
 343 struct netconfig *
 344 __rpc_getconf(void *vhandle)
 345 {
 346         struct handle *handle;
 347         struct netconfig *nconf;
 348
 349         handle = (struct handle *)vhandle;
 350         if (handle == NULL) {
 351                 return (NULL);
 352         }
 353         for (;;) {
 354                 if (handle->nflag)
 355                         nconf = getnetpath(handle->nhandle);
 356                 else
 357                         nconf = getnetconfig(handle->nhandle);
 358                 if (nconf == NULL)
 359                         break;
 360                 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 361                         (nconf->nc_semantics != NC_TPI_COTS) &&
 362                         (nconf->nc_semantics != NC_TPI_COTS_ORD))
 363                         continue;
 364                 switch (handle->nettype) {
 365                 case _RPC_VISIBLE:
 366                         if (!(nconf->nc_flag & NC_VISIBLE))
 367                                 continue;
 368                         /* FALLTHROUGH */
 369                 case _RPC_NETPATH:      /* Be happy */
 370                         break;
 371                 case _RPC_CIRCUIT_V:
 372                         if (!(nconf->nc_flag & NC_VISIBLE))
 373                                 continue;
 374                         /* FALLTHROUGH */
 375                 case _RPC_CIRCUIT_N:
 376                         if ((nconf->nc_semantics != NC_TPI_COTS) &&
 377                                 (nconf->nc_semantics != NC_TPI_COTS_ORD))
 378                                 continue;
 379                         break;
 380                 case _RPC_DATAGRAM_V:
 381                         if (!(nconf->nc_flag & NC_VISIBLE))
 382                                 continue;
 383                         /* FALLTHROUGH */
 384                 case _RPC_DATAGRAM_N:
 385                         if (nconf->nc_semantics != NC_TPI_CLTS)
 386                                 continue;
 387                         break;
 388                 case _RPC_TCP:
 389                         if (((nconf->nc_semantics != NC_TPI_COTS) &&
 390                                 (nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
 391                                 (strcmp(nconf->nc_protofmly, NC_INET)
 392 #ifdef INET6
 393                                  && strcmp(nconf->nc_protofmly, NC_INET6))
 394 #else
 395                                 )
 396 #endif
 397                                 ||
 398                                 strcmp(nconf->nc_proto, NC_TCP))
 399                                 continue;
 400                         break;
 401                 case _RPC_UDP:
 402                         if ((nconf->nc_semantics != NC_TPI_CLTS) ||
 403                                 (strcmp(nconf->nc_protofmly, NC_INET)
 404 #ifdef INET6
 405                                 && strcmp(nconf->nc_protofmly, NC_INET6))
 406 #else
 407                                 )
 408 #endif
 409                                 ||
 410                                 strcmp(nconf->nc_proto, NC_UDP))
 411                                 continue;
 412                         break;
 413                 }
 414                 break;
 415         }
 416         return (nconf);
 417 }
 418
 419 void
 420 __rpc_endconf(void *vhandle)
 421 {
 422         struct handle *handle;
 423
 424         handle = (struct handle *) vhandle;
 425         if (handle == NULL) {
 426                 return;
 427         }
 428         if (handle->nflag) {
 429                 endnetpath(handle->nhandle);
 430         } else {
 431                 endnetconfig(handle->nhandle);
 432         }
 433         free(handle);
 434 }
 435
 436 /*
 437  * Used to ping the NULL procedure for clnt handle.
 438  * Returns NULL if fails, else a non-NULL pointer.
 439  */
 440 void *
 441 rpc_nullproc(CLIENT *clnt)
 442 {
 443         struct timeval TIMEOUT = {25, 0};
 444
 445         if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
 446                 (xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
 447                 return (NULL);
 448         }
 449         return ((void *) clnt);
 450 }
 451
 452 /*
 453  * Try all possible transports until
 454  * one succeeds in finding the netconf for the given fd.
 455  */
 456 struct netconfig *
 457 __rpcgettp(int fd)
 458 {
 459         const char *netid;
 460         struct __rpc_sockinfo si;
 461
 462         if (!__rpc_fd2sockinfo(fd, &si))
 463                 return NULL;
 464
 465         if (!__rpc_sockinfo2netid(&si, &netid))
 466                 return NULL;
 467
 468         /*LINTED const castaway*/
 469         return getnetconfigent((char *)netid);
 470 }
 471
 472 int
 473 __rpc_fd2sockinfo(int fd, struct __rpc_sockinfo *sip)
 474 {
 475         socklen_t len;
 476         int type, proto;
 477         struct sockaddr_storage ss;
 478
 479         len = sizeof ss;
 480         if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &len) < 0)
 481                 return 0;
 482         sip->si_alen = len;
 483
 484         len = sizeof type;
 485         if (_getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
 486                 return 0;
 487
 488         /* XXX */
 489         if (ss.ss_family != AF_LOCAL) {
 490                 if (type == SOCK_STREAM)
 491                         proto = IPPROTO_TCP;
 492                 else if (type == SOCK_DGRAM)
 493                         proto = IPPROTO_UDP;
 494                 else
 495                         return 0;
 496         } else
 497                 proto = 0;
 498
 499         sip->si_af = ss.ss_family;
 500         sip->si_proto = proto;
 501         sip->si_socktype = type;
 502
 503         return 1;
 504 }
 505
 506 /*
 507  * Linear search, but the number of entries is small.
 508  */
 509 int
 510 __rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
 511 {
 512         int i;
 513
 514         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
 515                 if (strcmp(na_cvt[i].netid, nconf->nc_netid) == 0 || (
 516                     strcmp(nconf->nc_netid, "unix") == 0 &&
 517                     strcmp(na_cvt[i].netid, "local") == 0)) {
 518                         sip->si_af = na_cvt[i].af;
 519                         sip->si_proto = na_cvt[i].protocol;
 520                         sip->si_socktype =
 521                             __rpc_seman2socktype((int)nconf->nc_semantics);
 522                         if (sip->si_socktype == -1)
 523                                 return 0;
 524                         sip->si_alen = __rpc_get_a_size(sip->si_af);
 525                         return 1;
 526                 }
 527
 528         return 0;
 529 }
 530
 531 int
 532 __rpc_nconf2fd(const struct netconfig *nconf)
 533 {
 534         struct __rpc_sockinfo si;
 535
 536         if (!__rpc_nconf2sockinfo(nconf, &si))
 537                 return 0;
 538
 539         return _socket(si.si_af, si.si_socktype, si.si_proto);
 540 }
 541
 542 int
 543 __rpc_sockinfo2netid(struct __rpc_sockinfo *sip, const char **netid)
 544 {
 545         int i;
 546         struct netconfig *nconf;
 547
 548         nconf = getnetconfigent("local");
 549
 550         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++) {
 551                 if (na_cvt[i].af == sip->si_af &&
 552                     na_cvt[i].protocol == sip->si_proto) {
 553                         if (strcmp(na_cvt[i].netid, "local") == 0 && nconf == NULL) {
 554                                 if (netid)
 555                                         *netid = "unix";
 556                         } else {
 557                                 if (netid)
 558                                         *netid = na_cvt[i].netid;
 559                         }
 560                         if (nconf != NULL)
 561                                 freenetconfigent(nconf);
 562                         return 1;
 563                 }
 564         }
 565         if (nconf != NULL)
 566                 freenetconfigent(nconf);
 567
 568         return 0;
 569 }
 570
 571 char *
 572 taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
 573 {
 574         struct __rpc_sockinfo si;
 575
 576         if (!__rpc_nconf2sockinfo(nconf, &si))
 577                 return NULL;
 578         return __rpc_taddr2uaddr_af(si.si_af, nbuf);
 579 }
 580
 581 struct netbuf *
 582 uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
 583 {
 584         struct __rpc_sockinfo si;
 585
 586         if (!__rpc_nconf2sockinfo(nconf, &si))
 587                 return NULL;
 588         return __rpc_uaddr2taddr_af(si.si_af, uaddr);
 589 }
 590
 591 char *
 592 __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
 593 {
 594         char *ret;
 595         struct sockaddr_in *sin;
 596         struct sockaddr_un *sun;
 597         char namebuf[INET_ADDRSTRLEN];
 598 #ifdef INET6
 599         struct sockaddr_in6 *sin6;
 600         char namebuf6[INET6_ADDRSTRLEN];
 601 #endif
 602         u_int16_t port;
 603
 604         switch (af) {
 605         case AF_INET:
 606                 sin = nbuf->buf;
 607                 if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
 608                     == NULL)
 609                         return NULL;
 610                 port = ntohs(sin->sin_port);
 611                 if (asprintf(&ret, "%s.%u.%u", namebuf, ((u_int32_t)port) >> 8,
 612                     port & 0xff) < 0)
 613                         return NULL;
 614                 break;
 615 #ifdef INET6
 616         case AF_INET6:
 617                 sin6 = nbuf->buf;
 618                 if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
 619                     == NULL)
 620                         return NULL;
 621                 port = ntohs(sin6->sin6_port);
 622                 if (asprintf(&ret, "%s.%u.%u", namebuf6, ((u_int32_t)port) >> 8,
 623                     port & 0xff) < 0)
 624                         return NULL;
 625                 break;
 626 #endif
 627         case AF_LOCAL:
 628                 sun = nbuf->buf;
 629                 if (asprintf(&ret, "%.*s", (int)(sun->sun_len -
 630                     offsetof(struct sockaddr_un, sun_path)),
 631                     sun->sun_path) < 0)
 632                         return (NULL);
 633                 break;
 634         default:
 635                 return NULL;
 636         }
 637
 638         return ret;
 639 }
 640
 641 struct netbuf *
 642 __rpc_uaddr2taddr_af(int af, const char *uaddr)
 643 {
 644         struct netbuf *ret = NULL;
 645         char *addrstr, *p;
 646         unsigned port, portlo, porthi;
 647         struct sockaddr_in *sin;
 648 #ifdef INET6
 649         struct sockaddr_in6 *sin6;
 650 #endif
 651         struct sockaddr_un *sun;
 652
 653         port = 0;
 654         sin = NULL;
 655         addrstr = strdup(uaddr);
 656         if (addrstr == NULL)
 657                 return NULL;
 658
 659         /*
 660          * AF_LOCAL addresses are expected to be absolute
 661          * pathnames, anything else will be AF_INET or AF_INET6.
 662          */
 663         if (*addrstr != '/') {
 664                 p = strrchr(addrstr, '.');
 665                 if (p == NULL)
 666                         goto out;
 667                 portlo = (unsigned)atoi(p + 1);
 668                 *p = '\0';
 669
 670                 p = strrchr(addrstr, '.');
 671                 if (p == NULL)
 672                         goto out;
 673                 porthi = (unsigned)atoi(p + 1);
 674                 *p = '\0';
 675                 port = (porthi << 8) | portlo;
 676         }
 677
 678         ret = (struct netbuf *)malloc(sizeof *ret);
 679         if (ret == NULL)
 680                 goto out;
 681
 682         switch (af) {
 683         case AF_INET:
 684                 sin = (struct sockaddr_in *)malloc(sizeof *sin);
 685                 if (sin == NULL)
 686                         goto out;
 687                 memset(sin, 0, sizeof *sin);
 688                 sin->sin_family = AF_INET;
 689                 sin->sin_port = htons(port);
 690                 if (inet_pton(AF_INET, addrstr, &sin->sin_addr) <= 0) {
 691                         free(sin);
 692                         free(ret);
 693                         ret = NULL;
 694                         goto out;
 695                 }
 696                 sin->sin_len = ret->maxlen = ret->len = sizeof *sin;
 697                 ret->buf = sin;
 698                 break;
 699 #ifdef INET6
 700         case AF_INET6:
 701                 sin6 = (struct sockaddr_in6 *)malloc(sizeof *sin6);
 702                 if (sin6 == NULL)
 703                         goto out;
 704                 memset(sin6, 0, sizeof *sin6);
 705                 sin6->sin6_family = AF_INET6;
 706                 sin6->sin6_port = htons(port);
 707                 if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
 708                         free(sin6);
 709                         free(ret);
 710                         ret = NULL;
 711                         goto out;
 712                 }
 713                 sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
 714                 ret->buf = sin6;
 715                 break;
 716 #endif
 717         case AF_LOCAL:
 718                 sun = (struct sockaddr_un *)malloc(sizeof *sun);
 719                 if (sun == NULL)
 720                         goto out;
 721                 memset(sun, 0, sizeof *sun);
 722                 sun->sun_family = AF_LOCAL;
 723                 strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
 724                 ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
 725                 ret->buf = sun;
 726                 break;
 727         default:
 728                 break;
 729         }
 730 out:
 731         free(addrstr);
 732         return ret;
 733 }
 734
 735 int
 736 __rpc_seman2socktype(int semantics)
 737 {
 738         switch (semantics) {
 739         case NC_TPI_CLTS:
 740                 return SOCK_DGRAM;
 741         case NC_TPI_COTS_ORD:
 742                 return SOCK_STREAM;
 743         case NC_TPI_RAW:
 744                 return SOCK_RAW;
 745         default:
 746                 break;
 747         }
 748
 749         return -1;
 750 }
 751
 752 int
 753 __rpc_socktype2seman(int socktype)
 754 {
 755         switch (socktype) {
 756         case SOCK_DGRAM:
 757                 return NC_TPI_CLTS;
 758         case SOCK_STREAM:
 759                 return NC_TPI_COTS_ORD;
 760         case SOCK_RAW:
 761                 return NC_TPI_RAW;
 762         default:
 763                 break;
 764         }
 765
 766         return -1;
 767 }
 768
 769 /*
 770  * XXXX - IPv6 scope IDs can't be handled in universal addresses.
 771  * Here, we compare the original server address to that of the RPC
 772  * service we just received back from a call to rpcbind on the remote
 773  * machine. If they are both "link local" or "site local", copy
 774  * the scope id of the server address over to the service address.
 775  */
 776 int
 777 __rpc_fixup_addr(struct netbuf *new, const struct netbuf *svc)
 778 {
 779 #ifdef INET6
 780         struct sockaddr *sa_new, *sa_svc;
 781         struct sockaddr_in6 *sin6_new, *sin6_svc;
 782
 783         sa_svc = (struct sockaddr *)svc->buf;
 784         sa_new = (struct sockaddr *)new->buf;
 785
 786         if (sa_new->sa_family == sa_svc->sa_family &&
 787             sa_new->sa_family == AF_INET6) {
 788                 sin6_new = (struct sockaddr_in6 *)new->buf;
 789                 sin6_svc = (struct sockaddr_in6 *)svc->buf;
 790
 791                 if ((IN6_IS_ADDR_LINKLOCAL(&sin6_new->sin6_addr) &&
 792                      IN6_IS_ADDR_LINKLOCAL(&sin6_svc->sin6_addr)) ||
 793                     (IN6_IS_ADDR_SITELOCAL(&sin6_new->sin6_addr) &&
 794                      IN6_IS_ADDR_SITELOCAL(&sin6_svc->sin6_addr))) {
 795                         sin6_new->sin6_scope_id = sin6_svc->sin6_scope_id;
 796                 }
 797         }
 798 #endif
 799         return 1;
 800 }
 801
 802 int
 803 __rpc_sockisbound(int fd)
 804 {
 805         struct sockaddr_storage ss;
 806         socklen_t slen;
 807
 808         slen = sizeof (struct sockaddr_storage);
 809         if (_getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
 810                 return 0;
 811
 812         switch (ss.ss_family) {
 813                 case AF_INET:
 814                         return (((struct sockaddr_in *)
 815                             (void *)&ss)->sin_port != 0);
 816 #ifdef INET6
 817                 case AF_INET6:
 818                         return (((struct sockaddr_in6 *)
 819                             (void *)&ss)->sin6_port != 0);
 820 #endif
 821                 case AF_LOCAL:
 822                         /* XXX check this */
 823                         return (((struct sockaddr_un *)
 824                             (void *)&ss)->sun_path[0] != '\0');
 825                 default:
 826                         break;
 827         }
 828
 829         return 0;
 830 }