lib/libc/rpc/rpc_generic.c

   1 /*      $NetBSD: rpc_generic.c,v 1.24 2010/12/08 02:06:38 joerg Exp $   */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31 /*
  32  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  33  */
  34
  35 /* #pragma ident        "@(#)rpc_generic.c      1.17    94/04/24 SMI" */
  36
  37 /*
  38  * rpc_generic.c, Miscl routines for RPC.
  39  *
  40  */
  41
  42 #include <sys/cdefs.h>
  43 #if defined(LIBC_SCCS) && !defined(lint)
  44 __RCSID("$NetBSD: rpc_generic.c,v 1.24 2010/12/08 02:06:38 joerg Exp $");
  45 #endif
  46
  47 #include "namespace.h"
  48 #include "reentrant.h"
  49 #include <sys/types.h>
  50 #include <sys/param.h>
  51 #include <sys/socket.h>
  52 #include <sys/un.h>
  53 #include <sys/resource.h>
  54 #include <netinet/in.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57 #include <rpc/rpc.h>
  58 #include <assert.h>
  59 #include <ctype.h>
  60 #include <stdio.h>
  61 #include <netdb.h>
  62 #include <netconfig.h>
  63 #include <malloc.h>
  64 #include <string.h>
  65 #include <syslog.h>
  66 #include <rpc/nettype.h>
  67 #include "rpc_internal.h"
  68
  69 #ifdef __weak_alias
  70 __weak_alias(taddr2uaddr,_taddr2uaddr)
  71 __weak_alias(uaddr2taddr,_uaddr2taddr)
  72 #endif
  73
  74 struct handle {
  75         NCONF_HANDLE *nhandle;
  76         int nflag;              /* Whether NETPATH or NETCONFIG */
  77         int nettype;
  78 };
  79
  80 static const struct _rpcnettype {
  81         const char *name;
  82         const int type;
  83 } _rpctypelist[] = {
  84         { "netpath", _RPC_NETPATH },
  85         { "visible", _RPC_VISIBLE },
  86         { "circuit_v", _RPC_CIRCUIT_V },
  87         { "datagram_v", _RPC_DATAGRAM_V },
  88         { "circuit_n", _RPC_CIRCUIT_N },
  89         { "datagram_n", _RPC_DATAGRAM_N },
  90         { "tcp", _RPC_TCP },
  91         { "udp", _RPC_UDP },
  92         { 0, _RPC_NONE }
  93 };
  94
  95 struct netid_af {
  96         const char      *netid;
  97         int             af;
  98         int             protocol;
  99 };
 100
 101 static const struct netid_af na_cvt[] = {
 102         { "udp",  AF_INET,  IPPROTO_UDP },
 103         { "tcp",  AF_INET,  IPPROTO_TCP },
 104 #ifdef INET6
 105         { "udp6", AF_INET6, IPPROTO_UDP },
 106         { "tcp6", AF_INET6, IPPROTO_TCP },
 107 #endif
 108         { "local", AF_LOCAL, 0 }
 109 };
 110
 111 #if 0
 112 static char *strlocase __P((char *));
 113 #endif
 114 static int getnettype __P((const char *));
 115
 116 /*
 117  * Cache the result of getrlimit(), so we don't have to do an
 118  * expensive call every time.
 119  */
 120 int
 121 __rpc_dtbsize()
 122 {
 123         static int tbsize;
 124         struct rlimit rl;
 125
 126         if (tbsize) {
 127                 return (tbsize);
 128         }
 129         if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
 130                 return (tbsize = (int)rl.rlim_max);
 131         }
 132         /*
 133          * Something wrong.  I'll try to save face by returning a
 134          * pessimistic number.
 135          */
 136         return (32);
 137 }
 138
 139
 140 /*
 141  * Find the appropriate buffer size
 142  */
 143 u_int
 144 /*ARGSUSED*/
 145 __rpc_get_t_size(af, proto, size)
 146         int af, proto;
 147         int size;       /* Size requested */
 148 {
 149         int maxsize, defsize;
 150
 151         maxsize = 256 * 1024;   /* XXX */
 152         switch (proto) {
 153         case IPPROTO_TCP:
 154                 defsize = 64 * 1024;    /* XXX */
 155                 break;
 156         case IPPROTO_UDP:
 157                 defsize = UDPMSGSIZE;
 158                 break;
 159         default:
 160                 defsize = RPC_MAXDATASIZE;
 161                 break;
 162         }
 163         if (size == 0)
 164                 return defsize;
 165
 166         /* Check whether the value is within the upper max limit */
 167         return (size > maxsize ? (u_int)maxsize : (u_int)size);
 168 }
 169
 170 /*
 171  * Find the appropriate address buffer size
 172  */
 173 u_int
 174 __rpc_get_a_size(af)
 175         int af;
 176 {
 177         switch (af) {
 178         case AF_INET:
 179                 return sizeof (struct sockaddr_in);
 180 #ifdef INET6
 181         case AF_INET6:
 182                 return sizeof (struct sockaddr_in6);
 183 #endif
 184         case AF_LOCAL:
 185                 return sizeof (struct sockaddr_un);
 186         default:
 187                 break;
 188         }
 189         return ((u_int)RPC_MAXADDRSIZE);
 190 }
 191
 192 #if 0
 193 static char *
 194 strlocase(p)
 195         char *p;
 196 {
 197         char *t = p;
 198
 199         _DIAGASSERT(p != NULL);
 200
 201         for (; *p; p++)
 202                 if (isupper(*p))
 203                         *p = tolower(*p);
 204         return (t);
 205 }
 206 #endif
 207
 208 /*
 209  * Returns the type of the network as defined in <rpc/nettype.h>
 210  * If nettype is NULL, it defaults to NETPATH.
 211  */
 212 static int
 213 getnettype(nettype)
 214         const char *nettype;
 215 {
 216         int i;
 217
 218         if ((nettype == NULL) || (nettype[0] == 0)) {
 219                 return (_RPC_NETPATH);  /* Default */
 220         }
 221
 222 #if 0
 223         nettype = strlocase(nettype);
 224 #endif
 225         for (i = 0; _rpctypelist[i].name; i++)
 226                 if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
 227                         return (_rpctypelist[i].type);
 228                 }
 229         return (_rpctypelist[i].type);
 230 }
 231
 232 /*
 233  * For the given nettype (tcp or udp only), return the first structure found.
 234  * This should be freed by calling freenetconfigent()
 235  */
 236
 237 #ifdef _REENTRANT
 238 static thread_key_t tcp_key, udp_key;
 239 static once_t __rpc_getconfigp_once = ONCE_INITIALIZER;
 240
 241 static void
 242 __rpc_getconfigp_setup(void)
 243 {
 244
 245         thr_keycreate(&tcp_key, free);
 246         thr_keycreate(&udp_key, free);
 247 }
 248 #endif
 249
 250 struct netconfig *
 251 __rpc_getconfip(nettype)
 252         const char *nettype;
 253 {
 254         char *netid;
 255         char *netid_tcp = NULL;
 256         char *netid_udp = NULL;
 257         static char *netid_tcp_main;
 258         static char *netid_udp_main;
 259         struct netconfig *dummy;
 260 #ifdef _REENTRANT
 261         if (__isthreaded == 0) {
 262                 netid_udp = netid_udp_main;
 263                 netid_tcp = netid_tcp_main;
 264         } else {
 265                 thr_once(&__rpc_getconfigp_once, __rpc_getconfigp_setup);
 266                 netid_tcp = thr_getspecific(tcp_key);
 267                 netid_udp = thr_getspecific(udp_key);
 268         }
 269 #else
 270         netid_udp = netid_udp_main;
 271         netid_tcp = netid_tcp_main;
 272 #endif
 273
 274         _DIAGASSERT(nettype != NULL);
 275
 276         if (!netid_udp && !netid_tcp) {
 277                 struct netconfig *nconf;
 278                 void *confighandle;
 279
 280                 if (!(confighandle = setnetconfig())) {
 281                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 282                         return (NULL);
 283                 }
 284                 while ((nconf = getnetconfig(confighandle)) != NULL) {
 285                         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 286                                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 287                                         netid_tcp = strdup(nconf->nc_netid);
 288                                         if (netid_tcp == NULL)
 289                                                 return NULL;
 290 #ifdef _REENTRANT
 291                                         if (__isthreaded == 0)
 292                                                 netid_tcp_main = netid_tcp;
 293                                         else
 294                                                 thr_setspecific(tcp_key,
 295                                                         (void *) netid_tcp);
 296 #else
 297                                         netid_tcp_main = netid_tcp;
 298 #endif
 299                                 } else
 300                                 if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
 301                                         netid_udp = strdup(nconf->nc_netid);
 302                                         if (netid_udp == NULL)
 303                                                 return NULL;
 304 #ifdef _REENTRANT
 305                                         if (__isthreaded == 0)
 306                                                 netid_udp_main = netid_udp;
 307                                         else
 308                                                 thr_setspecific(udp_key,
 309                                                         (void *) netid_udp);
 310 #else
 311                                         netid_udp_main = netid_udp;
 312 #endif
 313                                 }
 314                         }
 315                 }
 316                 endnetconfig(confighandle);
 317         }
 318         if (strcmp(nettype, "udp") == 0)
 319                 netid = netid_udp;
 320         else if (strcmp(nettype, "tcp") == 0)
 321                 netid = netid_tcp;
 322         else {
 323                 return (NULL);
 324         }
 325         if ((netid == NULL) || (netid[0] == 0)) {
 326                 return (NULL);
 327         }
 328         dummy = getnetconfigent(netid);
 329         return (dummy);
 330 }
 331
 332 /*
 333  * Returns the type of the nettype, which should then be used with
 334  * __rpc_getconf().
 335  */
 336 void *
 337 __rpc_setconf(nettype)
 338         const char *nettype;
 339 {
 340         struct handle *handle;
 341
 342         /* nettype may be NULL; getnettype() supports that */
 343
 344         handle = malloc(sizeof(*handle));
 345         if (handle == NULL) {
 346                 return (NULL);
 347         }
 348         switch (handle->nettype = getnettype(nettype)) {
 349         case _RPC_NETPATH:
 350         case _RPC_CIRCUIT_N:
 351         case _RPC_DATAGRAM_N:
 352                 if (!(handle->nhandle = setnetpath())) {
 353                         free(handle);
 354                         return (NULL);
 355                 }
 356                 handle->nflag = TRUE;
 357                 break;
 358         case _RPC_VISIBLE:
 359         case _RPC_CIRCUIT_V:
 360         case _RPC_DATAGRAM_V:
 361         case _RPC_TCP:
 362         case _RPC_UDP:
 363                 if (!(handle->nhandle = setnetconfig())) {
 364                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 365                         free(handle);
 366                         return (NULL);
 367                 }
 368                 handle->nflag = FALSE;
 369                 break;
 370         default:
 371                 free(handle);
 372                 return (NULL);
 373         }
 374
 375         return (handle);
 376 }
 377
 378 /*
 379  * Returns the next netconfig struct for the given "net" type.
 380  * __rpc_setconf() should have been called previously.
 381  */
 382 struct netconfig *
 383 __rpc_getconf(vhandle)
 384         void *vhandle;
 385 {
 386         struct handle *handle;
 387         struct netconfig *nconf;
 388
 389         handle = (struct handle *)vhandle;
 390         if (handle == NULL) {
 391                 return (NULL);
 392         }
 393         for (;;) {
 394                 if (handle->nflag)
 395                         nconf = getnetpath(handle->nhandle);
 396                 else
 397                         nconf = getnetconfig(handle->nhandle);
 398                 if (nconf == NULL)
 399                         break;
 400                 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 401                         (nconf->nc_semantics != NC_TPI_COTS) &&
 402                         (nconf->nc_semantics != NC_TPI_COTS_ORD))
 403                         continue;
 404                 switch (handle->nettype) {
 405                 case _RPC_VISIBLE:
 406                         if (!(nconf->nc_flag & NC_VISIBLE))
 407                                 continue;
 408                         /* FALLTHROUGH */
 409                 case _RPC_NETPATH:      /* Be happy */
 410                         break;
 411                 case _RPC_CIRCUIT_V:
 412                         if (!(nconf->nc_flag & NC_VISIBLE))
 413                                 continue;
 414                         /* FALLTHROUGH */
 415                 case _RPC_CIRCUIT_N:
 416                         if ((nconf->nc_semantics != NC_TPI_COTS) &&
 417                                 (nconf->nc_semantics != NC_TPI_COTS_ORD))
 418                                 continue;
 419                         break;
 420                 case _RPC_DATAGRAM_V:
 421                         if (!(nconf->nc_flag & NC_VISIBLE))
 422                                 continue;
 423                         /* FALLTHROUGH */
 424                 case _RPC_DATAGRAM_N:
 425                         if (nconf->nc_semantics != NC_TPI_CLTS)
 426                                 continue;
 427                         break;
 428                 case _RPC_TCP:
 429                         if (((nconf->nc_semantics != NC_TPI_COTS) &&
 430                                 (nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
 431                                 (strcmp(nconf->nc_protofmly, NC_INET)
 432 #ifdef INET6
 433                                  && strcmp(nconf->nc_protofmly, NC_INET6))
 434 #else
 435                                 )
 436 #endif
 437                                 ||
 438                                 strcmp(nconf->nc_proto, NC_TCP))
 439                                 continue;
 440                         break;
 441                 case _RPC_UDP:
 442                         if ((nconf->nc_semantics != NC_TPI_CLTS) ||
 443                                 (strcmp(nconf->nc_protofmly, NC_INET)
 444 #ifdef INET6
 445                                 && strcmp(nconf->nc_protofmly, NC_INET6))
 446 #else
 447                                 )
 448 #endif
 449                                 ||
 450                                 strcmp(nconf->nc_proto, NC_UDP))
 451                                 continue;
 452                         break;
 453                 }
 454                 break;
 455         }
 456         return (nconf);
 457 }
 458
 459 void
 460 __rpc_endconf(vhandle)
 461         void * vhandle;
 462 {
 463         struct handle *handle;
 464
 465         handle = (struct handle *) vhandle;
 466         if (handle == NULL) {
 467                 return;
 468         }
 469         if (handle->nflag) {
 470                 endnetpath(handle->nhandle);
 471         } else {
 472                 endnetconfig(handle->nhandle);
 473         }
 474         free(handle);
 475 }
 476
 477 /*
 478  * Used to ping the NULL procedure for clnt handle.
 479  * Returns NULL if fails, else a non-NULL pointer.
 480  */
 481 void *
 482 rpc_nullproc(clnt)
 483         CLIENT *clnt;
 484 {
 485         struct timeval TIMEOUT = {25, 0};
 486
 487         if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
 488                 (xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
 489                 return (NULL);
 490         }
 491         return ((void *) clnt);
 492 }
 493
 494 /*
 495  * Try all possible transports until
 496  * one succeeds in finding the netconf for the given fd.
 497  */
 498 struct netconfig *
 499 __rpcgettp(fd)
 500         int fd;
 501 {
 502         const char *netid;
 503         struct __rpc_sockinfo si;
 504
 505         if (!__rpc_fd2sockinfo(fd, &si))
 506                 return NULL;
 507
 508         if (!__rpc_sockinfo2netid(&si, &netid))
 509                 return NULL;
 510
 511         return getnetconfigent(__UNCONST(netid));
 512 }
 513
 514 int
 515 __rpc_fd2sockinfo(int fd, struct __rpc_sockinfo *sip)
 516 {
 517         socklen_t len;
 518         int type, proto;
 519         struct sockaddr_storage ss;
 520
 521         _DIAGASSERT(sip != NULL);
 522
 523         len = sizeof ss;
 524         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &len) < 0)
 525                 return 0;
 526         sip->si_alen = len;
 527
 528         len = sizeof type;
 529         if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
 530                 return 0;
 531
 532         /* XXX */
 533         if (ss.ss_family != AF_LOCAL) {
 534                 if (type == SOCK_STREAM)
 535                         proto = IPPROTO_TCP;
 536                 else if (type == SOCK_DGRAM)
 537                         proto = IPPROTO_UDP;
 538                 else
 539                         return 0;
 540         } else
 541                 proto = 0;
 542
 543         sip->si_af = ss.ss_family;
 544         sip->si_proto = proto;
 545         sip->si_socktype = type;
 546
 547         return 1;
 548 }
 549
 550 /*
 551  * Linear search, but the number of entries is small.
 552  */
 553 int
 554 __rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
 555 {
 556         size_t i;
 557
 558         _DIAGASSERT(nconf != NULL);
 559         _DIAGASSERT(sip != NULL);
 560
 561         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
 562                 if (!strcmp(na_cvt[i].netid, nconf->nc_netid)) {
 563                         sip->si_af = na_cvt[i].af;
 564                         sip->si_proto = na_cvt[i].protocol;
 565                         sip->si_socktype =
 566                             __rpc_seman2socktype((int)nconf->nc_semantics);
 567                         if (sip->si_socktype == -1)
 568                                 return 0;
 569                         sip->si_alen = __rpc_get_a_size(sip->si_af);
 570                         return 1;
 571                 }
 572
 573         return 0;
 574 }
 575
 576 int
 577 __rpc_nconf2fd(const struct netconfig *nconf)
 578 {
 579         struct __rpc_sockinfo si;
 580
 581         _DIAGASSERT(nconf != NULL);
 582
 583         if (!__rpc_nconf2sockinfo(nconf, &si))
 584                 return 0;
 585
 586         return socket(si.si_af, si.si_socktype, si.si_proto);
 587 }
 588
 589 int
 590 __rpc_sockinfo2netid(struct __rpc_sockinfo *sip, const char **netid)
 591 {
 592         size_t i;
 593
 594         _DIAGASSERT(sip != NULL);
 595         /* netid may be NULL */
 596
 597         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
 598                 if (na_cvt[i].af == sip->si_af &&
 599                     na_cvt[i].protocol == sip->si_proto) {
 600                         if (netid)
 601                                 *netid = na_cvt[i].netid;
 602                         return 1;
 603                 }
 604
 605         return 0;
 606 }
 607
 608 char *
 609 taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
 610 {
 611         struct __rpc_sockinfo si;
 612
 613         _DIAGASSERT(nconf != NULL);
 614         _DIAGASSERT(nbuf != NULL);
 615
 616         if (!__rpc_nconf2sockinfo(nconf, &si))
 617                 return NULL;
 618         return __rpc_taddr2uaddr_af(si.si_af, nbuf);
 619 }
 620
 621 struct netbuf *
 622 uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
 623 {
 624         struct __rpc_sockinfo si;
 625
 626         _DIAGASSERT(nconf != NULL);
 627         _DIAGASSERT(uaddr != NULL);
 628
 629         if (!__rpc_nconf2sockinfo(nconf, &si))
 630                 return NULL;
 631         return __rpc_uaddr2taddr_af(si.si_af, uaddr);
 632 }
 633
 634 char *
 635 __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
 636 {
 637         char *ret;
 638         struct sockaddr_in *sinp;
 639         struct sockaddr_un *sun;
 640         char namebuf[INET_ADDRSTRLEN];
 641 #ifdef INET6
 642         struct sockaddr_in6 *sin6;
 643         char namebuf6[INET6_ADDRSTRLEN];
 644 #endif
 645         u_int16_t port;
 646
 647         _DIAGASSERT(nbuf != NULL);
 648
 649         switch (af) {
 650         case AF_INET:
 651                 sinp = nbuf->buf;
 652                 if (inet_ntop(af, &sinp->sin_addr, namebuf, sizeof namebuf)
 653                     == NULL)
 654                         return NULL;
 655                 port = ntohs(sinp->sin_port);
 656                 if (asprintf(&ret, "%s.%u.%u", namebuf, ((u_int32_t)port) >> 8,
 657                     port & 0xff) < 0)
 658                         return NULL;
 659                 break;
 660 #ifdef INET6
 661         case AF_INET6:
 662                 sin6 = nbuf->buf;
 663                 if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
 664                     == NULL)
 665                         return NULL;
 666                 port = ntohs(sin6->sin6_port);
 667                 if (asprintf(&ret, "%s.%u.%u", namebuf6, ((u_int32_t)port) >> 8,
 668                     port & 0xff) < 0)
 669                         return NULL;
 670                 break;
 671 #endif
 672         case AF_LOCAL:
 673                 sun = nbuf->buf;
 674                 sun->sun_path[sizeof(sun->sun_path) - 1] = '\0'; /* safety */
 675                 ret = strdup(sun->sun_path);
 676                 break;
 677         default:
 678                 return NULL;
 679         }
 680
 681         return ret;
 682 }
 683
 684 struct netbuf *
 685 __rpc_uaddr2taddr_af(int af, const char *uaddr)
 686 {
 687         struct netbuf *ret = NULL;
 688         char *addrstr, *p;
 689         unsigned port, portlo, porthi;
 690         struct sockaddr_in *sinp;
 691 #ifdef INET6
 692         struct sockaddr_in6 *sin6;
 693 #endif
 694         struct sockaddr_un *sun;
 695
 696         _DIAGASSERT(uaddr != NULL);
 697
 698         addrstr = strdup(uaddr);
 699         if (addrstr == NULL)
 700                 return NULL;
 701
 702         /*
 703          * AF_LOCAL addresses are expected to be absolute
 704          * pathnames, anything else will be AF_INET or AF_INET6.
 705          */
 706         port = 0;
 707         if (*addrstr != '/') {
 708                 p = strrchr(addrstr, '.');
 709                 if (p == NULL)
 710                         goto out;
 711                 portlo = (unsigned)atoi(p + 1);
 712                 *p = '\0';
 713
 714                 p = strrchr(addrstr, '.');
 715                 if (p == NULL)
 716                         goto out;
 717                 porthi = (unsigned)atoi(p + 1);
 718                 *p = '\0';
 719                 port = (porthi << 8) | portlo;
 720         }
 721
 722         ret = malloc(sizeof(*ret));
 723         if (ret == NULL)
 724                 goto out;
 725
 726         switch (af) {
 727         case AF_INET:
 728                 sinp = malloc(sizeof(*sinp));
 729                 if (sinp == NULL)
 730                         goto out;
 731                 memset(sinp, 0, sizeof *sinp);
 732                 sinp->sin_family = AF_INET;
 733                 sinp->sin_port = htons(port);
 734                 if (inet_pton(AF_INET, addrstr, &sinp->sin_addr) <= 0) {
 735                         free(sinp);
 736                         free(ret);
 737                         ret = NULL;
 738                         goto out;
 739                 }
 740                 sinp->sin_len = ret->maxlen = ret->len = sizeof *sinp;
 741                 ret->buf = sinp;
 742                 break;
 743 #ifdef INET6
 744         case AF_INET6:
 745                 sin6 = malloc(sizeof(*sin6));
 746                 if (sin6 == NULL)
 747                         goto out;
 748                 memset(sin6, 0, sizeof *sin6);
 749                 sin6->sin6_family = AF_INET6;
 750                 sin6->sin6_port = htons(port);
 751                 if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
 752                         free(sin6);
 753                         free(ret);
 754                         ret = NULL;
 755                         goto out;
 756                 }
 757                 sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
 758                 ret->buf = sin6;
 759                 break;
 760 #endif
 761         case AF_LOCAL:
 762                 sun = malloc(sizeof(*sun));
 763                 if (sun == NULL)
 764                         goto out;
 765                 memset(sun, 0, sizeof *sun);
 766                 sun->sun_family = AF_LOCAL;
 767                 strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
 768                 ret->len = ret->maxlen = sun->sun_len = SUN_LEN(sun);
 769                 ret->buf = sun;
 770                 break;
 771         default:
 772                 break;
 773         }
 774 out:
 775         free(addrstr);
 776         return ret;
 777 }
 778
 779 int
 780 __rpc_seman2socktype(int semantics)
 781 {
 782         switch (semantics) {
 783         case NC_TPI_CLTS:
 784                 return SOCK_DGRAM;
 785         case NC_TPI_COTS_ORD:
 786                 return SOCK_STREAM;
 787         case NC_TPI_RAW:
 788                 return SOCK_RAW;
 789         default:
 790                 break;
 791         }
 792
 793         return -1;
 794 }
 795
 796 int
 797 __rpc_socktype2seman(int socktype)
 798 {
 799         switch (socktype) {
 800         case SOCK_DGRAM:
 801                 return NC_TPI_CLTS;
 802         case SOCK_STREAM:
 803                 return NC_TPI_COTS_ORD;
 804         case SOCK_RAW:
 805                 return NC_TPI_RAW;
 806         default:
 807                 break;
 808         }
 809
 810         return -1;
 811 }
 812
 813 /*
 814  * XXXX - IPv6 scope IDs can't be handled in universal addresses.
 815  * Here, we compare the original server address to that of the RPC
 816  * service we just received back from a call to rpcbind on the remote
 817  * machine. If they are both "link local" or "site local", copy
 818  * the scope id of the server address over to the service address.
 819  */
 820 /* ARGSUSED */
 821 int
 822 __rpc_fixup_addr(struct netbuf *new, const struct netbuf *svc)
 823 {
 824 #ifdef INET6
 825         struct sockaddr *sa_new, *sa_svc;
 826         struct sockaddr_in6 *sin6_new, *sin6_svc;
 827
 828         _DIAGASSERT(new != NULL);
 829         _DIAGASSERT(svc != NULL);
 830
 831         sa_svc = (struct sockaddr *)svc->buf;
 832         sa_new = (struct sockaddr *)new->buf;
 833
 834         if (sa_new->sa_family == sa_svc->sa_family &&
 835             sa_new->sa_family == AF_INET6) {
 836                 sin6_new = (struct sockaddr_in6 *)new->buf;
 837                 sin6_svc = (struct sockaddr_in6 *)svc->buf;
 838
 839                 if ((IN6_IS_ADDR_LINKLOCAL(&sin6_new->sin6_addr) &&
 840                      IN6_IS_ADDR_LINKLOCAL(&sin6_svc->sin6_addr)) ||
 841                     (IN6_IS_ADDR_SITELOCAL(&sin6_new->sin6_addr) &&
 842                      IN6_IS_ADDR_SITELOCAL(&sin6_svc->sin6_addr))) {
 843                         sin6_new->sin6_scope_id = sin6_svc->sin6_scope_id;
 844                 }
 845         }
 846 #endif
 847         return 1;
 848 }
 849
 850 int
 851 __rpc_sockisbound(int fd)
 852 {
 853         struct sockaddr_storage ss;
 854         socklen_t slen;
 855
 856         slen = sizeof (struct sockaddr_storage);
 857         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
 858                 return 0;
 859
 860         switch (ss.ss_family) {
 861                 case AF_INET:
 862                         return (((struct sockaddr_in *)
 863                             (void *)&ss)->sin_port != 0);
 864 #ifdef INET6
 865                 case AF_INET6:
 866                         return (((struct sockaddr_in6 *)
 867                             (void *)&ss)->sin6_port != 0);
 868 #endif
 869                 case AF_LOCAL:
 870                         /* XXX check this */
 871                         return (((struct sockaddr_un *)
 872                             (void *)&ss)->sun_path[0] != '\0');
 873                 default:
 874                         break;
 875         }
 876
 877         return 0;
 878 }
 879
 880 /*
 881  * For TCP transport, Host Requirements RFCs mandate
 882  * Nagle (RFC-896) processing.  But for RPC, Nagle
 883  * processing adds adds unwanted latency to the last,
 884  * partial TCP segment of each RPC message. See:
 885  *   R. W. Scheifler and J. Gettys, The X Window System,
 886  *   ACM Transactions on Graphics 16:8 (Aug. 1983), pp. 57-69.
 887  * So for TCP transport, disable Nagle via TCP_NODELAY.
 888  * XXX: moral equivalent for non-TCP protocols?
 889  */
 890 int
 891 __rpc_setnodelay(int fd, const struct __rpc_sockinfo *si)
 892 {
 893         int one = 1;
 894         if (si->si_proto != IPPROTO_TCP)
 895                 return 0;
 896         return setsockopt(fd, si->si_proto, TCP_NODELAY, &one, sizeof(one));
 897 }