lib/libc/rpc/rpc_generic.c

   1 /*      $NetBSD: rpc_generic.c,v 1.29 2013/04/05 03:17:38 dholland Exp $        */
   2
   3 /*
   4  * Copyright (c) 2010, Oracle America, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are
   8  * met:
   9  *
  10  *     * Redistributions of source code must retain the above copyright
  11  *       notice, this list of conditions and the following disclaimer.
  12  *     * Redistributions in binary form must reproduce the above
  13  *       copyright notice, this list of conditions and the following
  14  *       disclaimer in the documentation and/or other materials
  15  *       provided with the distribution.
  16  *     * Neither the name of the "Oracle America, Inc." nor the names of its
  17  *       contributors may be used to endorse or promote products derived
  18  *       from this software without specific prior written permission.
  19  *
  20  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27  *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  29  *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  30  *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33 /*
  34  * Copyright (c) 1986-1991 by Sun Microsystems Inc.
  35  */
  36
  37 /* #pragma ident        "@(#)rpc_generic.c      1.17    94/04/24 SMI" */
  38
  39 /*
  40  * rpc_generic.c, Miscl routines for RPC.
  41  *
  42  */
  43
  44 #include <sys/cdefs.h>
  45 #if defined(LIBC_SCCS) && !defined(lint)
  46 __RCSID("$NetBSD: rpc_generic.c,v 1.29 2013/04/05 03:17:38 dholland Exp $");
  47 #endif
  48
  49 #include "namespace.h"
  50 #include "reentrant.h"
  51 #include <sys/types.h>
  52 #include <sys/param.h>
  53 #include <sys/socket.h>
  54 #include <sys/un.h>
  55 #include <sys/resource.h>
  56 #include <netinet/in.h>
  57 #include <netinet/tcp.h>
  58 #include <arpa/inet.h>
  59 #include <rpc/rpc.h>
  60 #include <assert.h>
  61 #include <ctype.h>
  62 #include <stdio.h>
  63 #include <netdb.h>
  64 #include <netconfig.h>
  65 #include <stdlib.h>
  66 #include <string.h>
  67 #include <syslog.h>
  68 #include <rpc/nettype.h>
  69
  70 #include "svc_fdset.h"
  71 #include "rpc_internal.h"
  72
  73 #ifdef __weak_alias
  74 __weak_alias(taddr2uaddr,_taddr2uaddr)
  75 __weak_alias(uaddr2taddr,_uaddr2taddr)
  76 #endif
  77
  78 struct handle {
  79         NCONF_HANDLE *nhandle;
  80         int nflag;              /* Whether NETPATH or NETCONFIG */
  81         int nettype;
  82 };
  83
  84 static const struct _rpcnettype {
  85         const char *name;
  86         const int type;
  87 } _rpctypelist[] = {
  88         { "netpath", _RPC_NETPATH },
  89         { "visible", _RPC_VISIBLE },
  90         { "circuit_v", _RPC_CIRCUIT_V },
  91         { "datagram_v", _RPC_DATAGRAM_V },
  92         { "circuit_n", _RPC_CIRCUIT_N },
  93         { "datagram_n", _RPC_DATAGRAM_N },
  94         { "tcp", _RPC_TCP },
  95         { "udp", _RPC_UDP },
  96         { 0, _RPC_NONE }
  97 };
  98
  99 struct netid_af {
 100         const char      *netid;
 101         int             af;
 102         int             protocol;
 103 };
 104
 105 static const struct netid_af na_cvt[] = {
 106         { "udp",  AF_INET,  IPPROTO_UDP },
 107         { "tcp",  AF_INET,  IPPROTO_TCP },
 108 #ifdef INET6
 109         { "udp6", AF_INET6, IPPROTO_UDP },
 110         { "tcp6", AF_INET6, IPPROTO_TCP },
 111 #endif
 112         { "local", AF_LOCAL, 0 }
 113 };
 114
 115 #if 0
 116 static char *strlocase(char *);
 117 #endif
 118 static int getnettype(const char *);
 119
 120 /*
 121  * Cache the result of getrlimit(), so we don't have to do an
 122  * expensive call every time.
 123  */
 124 int
 125 __rpc_dtbsize(void)
 126 {
 127         static int tbsize;
 128         struct rlimit rl;
 129
 130         if (tbsize) {
 131                 return (tbsize);
 132         }
 133         if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
 134                 return (tbsize = (int)rl.rlim_max);
 135         }
 136         /*
 137          * Something wrong.  I'll try to save face by returning a
 138          * pessimistic number.
 139          */
 140         return (32);
 141 }
 142
 143
 144 /*
 145  * Find the appropriate buffer size
 146  */
 147 u_int
 148 /*ARGSUSED*/
 149 __rpc_get_t_size(
 150         int af,
 151         int proto,
 152         int size)       /* Size requested */
 153 {
 154         int maxsize, defsize;
 155
 156         maxsize = 256 * 1024;   /* XXX */
 157         switch (proto) {
 158         case IPPROTO_TCP:
 159                 defsize = 64 * 1024;    /* XXX */
 160                 break;
 161         case IPPROTO_UDP:
 162                 defsize = UDPMSGSIZE;
 163                 break;
 164         default:
 165                 defsize = RPC_MAXDATASIZE;
 166                 break;
 167         }
 168         if (size == 0)
 169                 return defsize;
 170
 171         /* Check whether the value is within the upper max limit */
 172         return (size > maxsize ? (u_int)maxsize : (u_int)size);
 173 }
 174
 175 /*
 176  * Find the appropriate address buffer size
 177  */
 178 u_int
 179 __rpc_get_a_size(int af)
 180 {
 181         switch (af) {
 182         case AF_INET:
 183                 return sizeof (struct sockaddr_in);
 184 #ifdef INET6
 185         case AF_INET6:
 186                 return sizeof (struct sockaddr_in6);
 187 #endif
 188         case AF_LOCAL:
 189                 return sizeof (struct sockaddr_un);
 190         default:
 191                 break;
 192         }
 193         return ((u_int)RPC_MAXADDRSIZE);
 194 }
 195
 196 #if 0
 197 static char *
 198 strlocase(char *p)
 199 {
 200         char *t = p;
 201
 202         _DIAGASSERT(p != NULL);
 203
 204         for (; *p; p++)
 205                 if (isupper(*p))
 206                         *p = tolower(*p);
 207         return (t);
 208 }
 209 #endif
 210
 211 /*
 212  * Returns the type of the network as defined in <rpc/nettype.h>
 213  * If nettype is NULL, it defaults to NETPATH.
 214  */
 215 static int
 216 getnettype(const char *nettype)
 217 {
 218         int i;
 219
 220         if ((nettype == NULL) || (nettype[0] == 0)) {
 221                 return (_RPC_NETPATH);  /* Default */
 222         }
 223
 224 #if 0
 225         nettype = strlocase(nettype);
 226 #endif
 227         for (i = 0; _rpctypelist[i].name; i++)
 228                 if (strcasecmp(nettype, _rpctypelist[i].name) == 0) {
 229                         return (_rpctypelist[i].type);
 230                 }
 231         return (_rpctypelist[i].type);
 232 }
 233
 234 /*
 235  * For the given nettype (tcp or udp only), return the first structure found.
 236  * This should be freed by calling freenetconfigent()
 237  */
 238
 239 #ifdef _REENTRANT
 240 static thread_key_t tcp_key, udp_key;
 241 static once_t __rpc_getconfigp_once = ONCE_INITIALIZER;
 242
 243 static void
 244 __rpc_getconfigp_setup(void)
 245 {
 246
 247         thr_keycreate(&tcp_key, free);
 248         thr_keycreate(&udp_key, free);
 249 }
 250 #endif
 251
 252 struct netconfig *
 253 __rpc_getconfip(const char *nettype)
 254 {
 255         char *netid;
 256         char *netid_tcp = NULL;
 257         char *netid_udp = NULL;
 258         static char *netid_tcp_main;
 259         static char *netid_udp_main;
 260         struct netconfig *dummy;
 261 #ifdef _REENTRANT
 262         if (__isthreaded == 0) {
 263                 netid_udp = netid_udp_main;
 264                 netid_tcp = netid_tcp_main;
 265         } else {
 266                 thr_once(&__rpc_getconfigp_once, __rpc_getconfigp_setup);
 267                 netid_tcp = thr_getspecific(tcp_key);
 268                 netid_udp = thr_getspecific(udp_key);
 269         }
 270 #else
 271         netid_udp = netid_udp_main;
 272         netid_tcp = netid_tcp_main;
 273 #endif
 274
 275         _DIAGASSERT(nettype != NULL);
 276
 277         if (!netid_udp && !netid_tcp) {
 278                 struct netconfig *nconf;
 279                 void *confighandle;
 280
 281                 if (!(confighandle = setnetconfig())) {
 282                         syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
 283                         return (NULL);
 284                 }
 285                 while ((nconf = getnetconfig(confighandle)) != NULL) {
 286                         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 287                                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 288                                         netid_tcp = strdup(nconf->nc_netid);
 289                                         if (netid_tcp == NULL)
 290                                                 return NULL;
 291 #ifdef _REENTRANT
 292                                         if (__isthreaded == 0)
 293                                                 netid_tcp_main = netid_tcp;
 294                                         else
 295                                                 thr_setspecific(tcp_key,
 296                                                         (void *) netid_tcp);
 297 #else
 298                                         netid_tcp_main = netid_tcp;
 299 #endif
 300                                 } else
 301                                 if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
 302                                         netid_udp = strdup(nconf->nc_netid);
 303                                         if (netid_udp == NULL)
 304                                                 return NULL;
 305 #ifdef _REENTRANT
 306                                         if (__isthreaded == 0)
 307                                                 netid_udp_main = netid_udp;
 308                                         else
 309                                                 thr_setspecific(udp_key,
 310                                                         (void *) netid_udp);
 311 #else
 312                                         netid_udp_main = netid_udp;
 313 #endif
 314                                 }
 315                         }
 316                 }
 317                 endnetconfig(confighandle);
 318         }
 319         if (strcmp(nettype, "udp") == 0)
 320                 netid = netid_udp;
 321         else if (strcmp(nettype, "tcp") == 0)
 322                 netid = netid_tcp;
 323         else {
 324                 return (NULL);
 325         }
 326         if ((netid == NULL) || (netid[0] == 0)) {
 327                 return (NULL);
 328         }
 329         dummy = getnetconfigent(netid);
 330         return (dummy);
 331 }
 332
 333 /*
 334  * Returns the type of the nettype, which should then be used with
 335  * __rpc_getconf().
 336  */
 337 void *
 338 __rpc_setconf(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(void *vhandle)
 384 {
 385         struct handle *handle;
 386         struct netconfig *nconf;
 387
 388         handle = (struct handle *)vhandle;
 389         if (handle == NULL) {
 390                 return (NULL);
 391         }
 392         for (;;) {
 393                 if (handle->nflag)
 394                         nconf = getnetpath(handle->nhandle);
 395                 else
 396                         nconf = getnetconfig(handle->nhandle);
 397                 if (nconf == NULL)
 398                         break;
 399                 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 400                         (nconf->nc_semantics != NC_TPI_COTS) &&
 401                         (nconf->nc_semantics != NC_TPI_COTS_ORD))
 402                         continue;
 403                 switch (handle->nettype) {
 404                 case _RPC_VISIBLE:
 405                         if (!(nconf->nc_flag & NC_VISIBLE))
 406                                 continue;
 407                         /* FALLTHROUGH */
 408                 case _RPC_NETPATH:      /* Be happy */
 409                         break;
 410                 case _RPC_CIRCUIT_V:
 411                         if (!(nconf->nc_flag & NC_VISIBLE))
 412                                 continue;
 413                         /* FALLTHROUGH */
 414                 case _RPC_CIRCUIT_N:
 415                         if ((nconf->nc_semantics != NC_TPI_COTS) &&
 416                                 (nconf->nc_semantics != NC_TPI_COTS_ORD))
 417                                 continue;
 418                         break;
 419                 case _RPC_DATAGRAM_V:
 420                         if (!(nconf->nc_flag & NC_VISIBLE))
 421                                 continue;
 422                         /* FALLTHROUGH */
 423                 case _RPC_DATAGRAM_N:
 424                         if (nconf->nc_semantics != NC_TPI_CLTS)
 425                                 continue;
 426                         break;
 427                 case _RPC_TCP:
 428                         if (((nconf->nc_semantics != NC_TPI_COTS) &&
 429                                 (nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
 430                                 (strcmp(nconf->nc_protofmly, NC_INET)
 431 #ifdef INET6
 432                                  && strcmp(nconf->nc_protofmly, NC_INET6))
 433 #else
 434                                 )
 435 #endif
 436                                 ||
 437                                 strcmp(nconf->nc_proto, NC_TCP))
 438                                 continue;
 439                         break;
 440                 case _RPC_UDP:
 441                         if ((nconf->nc_semantics != NC_TPI_CLTS) ||
 442                                 (strcmp(nconf->nc_protofmly, NC_INET)
 443 #ifdef INET6
 444                                 && strcmp(nconf->nc_protofmly, NC_INET6))
 445 #else
 446                                 )
 447 #endif
 448                                 ||
 449                                 strcmp(nconf->nc_proto, NC_UDP))
 450                                 continue;
 451                         break;
 452                 }
 453                 break;
 454         }
 455         return (nconf);
 456 }
 457
 458 void
 459 __rpc_endconf(void *vhandle)
 460 {
 461         struct handle *handle;
 462
 463         handle = (struct handle *) vhandle;
 464         if (handle == NULL) {
 465                 return;
 466         }
 467         if (handle->nflag) {
 468                 endnetpath(handle->nhandle);
 469         } else {
 470                 endnetconfig(handle->nhandle);
 471         }
 472         free(handle);
 473 }
 474
 475 /*
 476  * Used to ping the NULL procedure for clnt handle.
 477  * Returns NULL if fails, else a non-NULL pointer.
 478  */
 479 void *
 480 rpc_nullproc(CLIENT *clnt)
 481 {
 482         struct timeval TIMEOUT = {25, 0};
 483
 484         if (clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, NULL,
 485                 (xdrproc_t) xdr_void, NULL, TIMEOUT) != RPC_SUCCESS) {
 486                 return (NULL);
 487         }
 488         return ((void *) clnt);
 489 }
 490
 491 /*
 492  * Try all possible transports until
 493  * one succeeds in finding the netconf for the given fd.
 494  */
 495 struct netconfig *
 496 __rpcgettp(int fd)
 497 {
 498         const char *netid;
 499         struct __rpc_sockinfo si;
 500
 501         if (!__rpc_fd2sockinfo(fd, &si))
 502                 return NULL;
 503
 504         if (!__rpc_sockinfo2netid(&si, &netid))
 505                 return NULL;
 506
 507         return getnetconfigent(__UNCONST(netid));
 508 }
 509
 510 int
 511 __rpc_fd2sockinfo(int fd, struct __rpc_sockinfo *sip)
 512 {
 513         socklen_t len;
 514         int type, proto;
 515         struct sockaddr_storage ss;
 516
 517         _DIAGASSERT(sip != NULL);
 518
 519         len = sizeof ss;
 520         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &len) < 0)
 521                 return 0;
 522         sip->si_alen = len;
 523
 524         len = sizeof type;
 525         if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &len) < 0)
 526                 return 0;
 527
 528         /* XXX */
 529         if (ss.ss_family != AF_LOCAL) {
 530                 if (type == SOCK_STREAM)
 531                         proto = IPPROTO_TCP;
 532                 else if (type == SOCK_DGRAM)
 533                         proto = IPPROTO_UDP;
 534                 else
 535                         return 0;
 536         } else
 537                 proto = 0;
 538
 539         sip->si_af = ss.ss_family;
 540         sip->si_proto = proto;
 541         sip->si_socktype = type;
 542
 543         return 1;
 544 }
 545
 546 /*
 547  * Linear search, but the number of entries is small.
 548  */
 549 int
 550 __rpc_nconf2sockinfo(const struct netconfig *nconf, struct __rpc_sockinfo *sip)
 551 {
 552         size_t i;
 553
 554         _DIAGASSERT(nconf != NULL);
 555         _DIAGASSERT(sip != NULL);
 556
 557         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
 558                 if (!strcmp(na_cvt[i].netid, nconf->nc_netid)) {
 559                         sip->si_af = na_cvt[i].af;
 560                         sip->si_proto = na_cvt[i].protocol;
 561                         sip->si_socktype =
 562                             __rpc_seman2socktype((int)nconf->nc_semantics);
 563                         if (sip->si_socktype == -1)
 564                                 return 0;
 565                         sip->si_alen = __rpc_get_a_size(sip->si_af);
 566                         return 1;
 567                 }
 568
 569         return 0;
 570 }
 571
 572 int
 573 __rpc_nconf2fd(const struct netconfig *nconf)
 574 {
 575         struct __rpc_sockinfo si;
 576
 577         _DIAGASSERT(nconf != NULL);
 578
 579         if (!__rpc_nconf2sockinfo(nconf, &si))
 580                 return 0;
 581
 582         return socket(si.si_af, si.si_socktype, si.si_proto);
 583 }
 584
 585 int
 586 __rpc_sockinfo2netid(struct __rpc_sockinfo *sip, const char **netid)
 587 {
 588         size_t i;
 589
 590         _DIAGASSERT(sip != NULL);
 591         /* netid may be NULL */
 592
 593         for (i = 0; i < (sizeof na_cvt) / (sizeof (struct netid_af)); i++)
 594                 if (na_cvt[i].af == sip->si_af &&
 595                     na_cvt[i].protocol == sip->si_proto) {
 596                         if (netid)
 597                                 *netid = na_cvt[i].netid;
 598                         return 1;
 599                 }
 600
 601         return 0;
 602 }
 603
 604 char *
 605 taddr2uaddr(const struct netconfig *nconf, const struct netbuf *nbuf)
 606 {
 607         struct __rpc_sockinfo si;
 608
 609         _DIAGASSERT(nconf != NULL);
 610         _DIAGASSERT(nbuf != NULL);
 611
 612         if (!__rpc_nconf2sockinfo(nconf, &si))
 613                 return NULL;
 614         return __rpc_taddr2uaddr_af(si.si_af, nbuf);
 615 }
 616
 617 struct netbuf *
 618 uaddr2taddr(const struct netconfig *nconf, const char *uaddr)
 619 {
 620         struct __rpc_sockinfo si;
 621
 622         _DIAGASSERT(nconf != NULL);
 623         _DIAGASSERT(uaddr != NULL);
 624
 625         if (!__rpc_nconf2sockinfo(nconf, &si))
 626                 return NULL;
 627         return __rpc_uaddr2taddr_af(si.si_af, uaddr);
 628 }
 629
 630 char *
 631 __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
 632 {
 633         char *ret;
 634         struct sockaddr_in *sinp;
 635         struct sockaddr_un *sun;
 636         char namebuf[INET_ADDRSTRLEN];
 637 #ifdef INET6
 638         struct sockaddr_in6 *sin6;
 639         char namebuf6[INET6_ADDRSTRLEN];
 640 #endif
 641         u_int16_t port;
 642
 643         _DIAGASSERT(nbuf != NULL);
 644
 645         switch (af) {
 646         case AF_INET:
 647                 sinp = nbuf->buf;
 648                 if (inet_ntop(af, &sinp->sin_addr, namebuf,
 649                     (socklen_t)sizeof namebuf) == NULL)
 650                         return NULL;
 651                 port = ntohs(sinp->sin_port);
 652                 if (asprintf(&ret, "%s.%u.%u", namebuf, ((u_int32_t)port) >> 8,
 653                     port & 0xff) < 0)
 654                         return NULL;
 655                 break;
 656 #ifdef INET6
 657         case AF_INET6:
 658                 sin6 = nbuf->buf;
 659                 if (inet_ntop(af, &sin6->sin6_addr, namebuf6,
 660                     (socklen_t)sizeof namebuf6) == NULL)
 661                         return NULL;
 662                 port = ntohs(sin6->sin6_port);
 663                 if (asprintf(&ret, "%s.%u.%u", namebuf6, ((u_int32_t)port) >> 8,
 664                     port & 0xff) < 0)
 665                         return NULL;
 666                 break;
 667 #endif
 668         case AF_LOCAL:
 669                 sun = nbuf->buf;
 670                 sun->sun_path[sizeof(sun->sun_path) - 1] = '\0'; /* safety */
 671                 ret = strdup(sun->sun_path);
 672                 break;
 673         default:
 674                 return NULL;
 675         }
 676
 677         return ret;
 678 }
 679
 680 struct netbuf *
 681 __rpc_uaddr2taddr_af(int af, const char *uaddr)
 682 {
 683         struct netbuf *ret = NULL;
 684         char *addrstr, *p;
 685         unsigned port, portlo, porthi;
 686         size_t len;
 687         struct sockaddr_in *sinp;
 688 #ifdef INET6
 689         struct sockaddr_in6 *sin6;
 690 #endif
 691         struct sockaddr_un *sun;
 692
 693         _DIAGASSERT(uaddr != NULL);
 694
 695         addrstr = strdup(uaddr);
 696         if (addrstr == NULL)
 697                 return NULL;
 698
 699         /*
 700          * AF_LOCAL addresses are expected to be absolute
 701          * pathnames, anything else will be AF_INET or AF_INET6.
 702          */
 703         port = 0;
 704         if (*addrstr != '/') {
 705                 p = strrchr(addrstr, '.');
 706                 if (p == NULL)
 707                         goto out;
 708                 portlo = (unsigned)atoi(p + 1);
 709                 *p = '\0';
 710
 711                 p = strrchr(addrstr, '.');
 712                 if (p == NULL)
 713                         goto out;
 714                 porthi = (unsigned)atoi(p + 1);
 715                 *p = '\0';
 716                 port = (porthi << 8) | portlo;
 717         }
 718
 719         ret = malloc(sizeof(*ret));
 720         if (ret == NULL)
 721                 goto out;
 722
 723         switch (af) {
 724         case AF_INET:
 725                 sinp = malloc(sizeof(*sinp));
 726                 if (sinp == NULL)
 727                         goto out;
 728                 memset(sinp, 0, sizeof *sinp);
 729                 sinp->sin_family = AF_INET;
 730                 sinp->sin_port = htons(port);
 731                 if (inet_pton(AF_INET, addrstr, &sinp->sin_addr) <= 0) {
 732                         free(sinp);
 733                         free(ret);
 734                         ret = NULL;
 735                         goto out;
 736                 }
 737                 sinp->sin_len = ret->maxlen = ret->len = sizeof *sinp;
 738                 ret->buf = sinp;
 739                 break;
 740 #ifdef INET6
 741         case AF_INET6:
 742                 sin6 = malloc(sizeof(*sin6));
 743                 if (sin6 == NULL)
 744                         goto out;
 745                 memset(sin6, 0, sizeof *sin6);
 746                 sin6->sin6_family = AF_INET6;
 747                 sin6->sin6_port = htons(port);
 748                 if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) <= 0) {
 749                         free(sin6);
 750                         free(ret);
 751                         ret = NULL;
 752                         goto out;
 753                 }
 754                 sin6->sin6_len = ret->maxlen = ret->len = sizeof *sin6;
 755                 ret->buf = sin6;
 756                 break;
 757 #endif
 758         case AF_LOCAL:
 759                 sun = malloc(sizeof(*sun));
 760                 if (sun == NULL)
 761                         goto out;
 762                 memset(sun, 0, sizeof *sun);
 763                 sun->sun_family = AF_LOCAL;
 764                 strncpy(sun->sun_path, addrstr, sizeof(sun->sun_path) - 1);
 765                 len = SUN_LEN(sun);
 766                 _DIAGASSERT(__type_fit(uint8_t, len));
 767                 ret->len = ret->maxlen = sun->sun_len = (uint8_t)len;
 768                 ret->buf = sun;
 769                 break;
 770         default:
 771                 break;
 772         }
 773 out:
 774         free(addrstr);
 775         return ret;
 776 }
 777
 778 int
 779 __rpc_seman2socktype(int semantics)
 780 {
 781         switch (semantics) {
 782         case NC_TPI_CLTS:
 783                 return SOCK_DGRAM;
 784         case NC_TPI_COTS_ORD:
 785                 return SOCK_STREAM;
 786         case NC_TPI_RAW:
 787                 return SOCK_RAW;
 788         default:
 789                 break;
 790         }
 791
 792         return -1;
 793 }
 794
 795 int
 796 __rpc_socktype2seman(int socktype)
 797 {
 798         switch (socktype) {
 799         case SOCK_DGRAM:
 800                 return NC_TPI_CLTS;
 801         case SOCK_STREAM:
 802                 return NC_TPI_COTS_ORD;
 803         case SOCK_RAW:
 804                 return NC_TPI_RAW;
 805         default:
 806                 break;
 807         }
 808
 809         return -1;
 810 }
 811
 812 /*
 813  * XXXX - IPv6 scope IDs can't be handled in universal addresses.
 814  * Here, we compare the original server address to that of the RPC
 815  * service we just received back from a call to rpcbind on the remote
 816  * machine. If they are both "link local" or "site local", copy
 817  * the scope id of the server address over to the service address.
 818  */
 819 /* ARGSUSED */
 820 int
 821 __rpc_fixup_addr(struct netbuf *new, const struct netbuf *svc)
 822 {
 823 #ifdef INET6
 824         struct sockaddr *sa_new, *sa_svc;
 825         struct sockaddr_in6 *sin6_new, *sin6_svc;
 826
 827         _DIAGASSERT(new != NULL);
 828         _DIAGASSERT(svc != NULL);
 829
 830         sa_svc = (struct sockaddr *)svc->buf;
 831         sa_new = (struct sockaddr *)new->buf;
 832
 833         if (sa_new->sa_family == sa_svc->sa_family &&
 834             sa_new->sa_family == AF_INET6) {
 835                 sin6_new = (struct sockaddr_in6 *)new->buf;
 836                 sin6_svc = (struct sockaddr_in6 *)svc->buf;
 837
 838                 if ((IN6_IS_ADDR_LINKLOCAL(&sin6_new->sin6_addr) &&
 839                      IN6_IS_ADDR_LINKLOCAL(&sin6_svc->sin6_addr)) ||
 840                     (IN6_IS_ADDR_SITELOCAL(&sin6_new->sin6_addr) &&
 841                      IN6_IS_ADDR_SITELOCAL(&sin6_svc->sin6_addr))) {
 842                         sin6_new->sin6_scope_id = sin6_svc->sin6_scope_id;
 843                 }
 844         }
 845 #endif
 846         return 1;
 847 }
 848
 849 int
 850 __rpc_sockisbound(int fd)
 851 {
 852         struct sockaddr_storage ss;
 853         socklen_t slen;
 854
 855         slen = sizeof (struct sockaddr_storage);
 856         if (getsockname(fd, (struct sockaddr *)(void *)&ss, &slen) < 0)
 857                 return 0;
 858
 859         switch (ss.ss_family) {
 860                 case AF_INET:
 861                         return (((struct sockaddr_in *)
 862                             (void *)&ss)->sin_port != 0);
 863 #ifdef INET6
 864                 case AF_INET6:
 865                         return (((struct sockaddr_in6 *)
 866                             (void *)&ss)->sin6_port != 0);
 867 #endif
 868                 case AF_LOCAL:
 869                         /* XXX check this */
 870                         return (((struct sockaddr_un *)
 871                             (void *)&ss)->sun_path[0] != '\0');
 872                 default:
 873                         break;
 874         }
 875
 876         return 0;
 877 }
 878
 879 /*
 880  * For TCP transport, Host Requirements RFCs mandate
 881  * Nagle (RFC-896) processing.  But for RPC, Nagle
 882  * processing adds adds unwanted latency to the last,
 883  * partial TCP segment of each RPC message. See:
 884  *   R. W. Scheifler and J. Gettys, The X Window System,
 885  *   ACM Transactions on Graphics 16:8 (Aug. 1983), pp. 57-69.
 886  * So for TCP transport, disable Nagle via TCP_NODELAY.
 887  * XXX: moral equivalent for non-TCP protocols?
 888  */
 889 int
 890 __rpc_setnodelay(int fd, const struct __rpc_sockinfo *si)
 891 {
 892         int one = 1;
 893         if (si->si_proto != IPPROTO_TCP)
 894                 return 0;
 895         return setsockopt(fd, si->si_proto, TCP_NODELAY, &one,
 896             (socklen_t)sizeof(one));
 897 }