usr/src/lib/libc/port/nsl/rpc_generic.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  28 /* All Rights Reserved */
  29 /*
  30  * Portions of this source code were derived from Berkeley
  31  * 4.3 BSD under license from the Regents of the University of
  32  * California.
  33  */
  34
  35
  36 /*
  37  * Miscl routines for RPC.
  38  */
  39
  40 #include "mt.h"
  41 #include "rpc_mt.h"
  42 #include <stdio.h>
  43 #include <sys/types.h>
  44 #include <rpc/rpc.h>
  45 #include <rpc/nettype.h>
  46 #include <sys/param.h>
  47 #include <sys/mkdev.h>
  48 #include <sys/stat.h>
  49 #include <ctype.h>
  50 #include <errno.h>
  51 #include <sys/resource.h>
  52 #include <netconfig.h>
  53 #include <malloc.h>
  54 #include <syslog.h>
  55 #include <string.h>
  56 #include <sys/systeminfo.h>
  57 #include <netdir.h>
  58 #include <netdb.h>
  59
  60 struct handle {
  61         NCONF_HANDLE *nhandle;
  62         int nflag;              /* Whether NETPATH or NETCONFIG */
  63         int nettype;
  64 };
  65
  66 struct _rpcnettype {
  67         const char *name;
  68         const int type;
  69 } _rpctypelist[] = {
  70         "netpath", _RPC_NETPATH,
  71         "visible", _RPC_VISIBLE,
  72         "circuit_v", _RPC_CIRCUIT_V,
  73         "datagram_v", _RPC_DATAGRAM_V,
  74         "circuit_n", _RPC_CIRCUIT_N,
  75         "datagram_n", _RPC_DATAGRAM_N,
  76         "tcp", _RPC_TCP,
  77         "udp", _RPC_UDP,
  78         "local", _RPC_LOCAL,
  79         "door", _RPC_DOOR,
  80         "door_local", _RPC_DOOR_LOCAL,
  81         "door_netpath", _RPC_DOOR_NETPATH,
  82         0, _RPC_NONE
  83 };
  84
  85 /*
  86  * Cache the result of getrlimit(), so we don't have to do an
  87  * expensive call every time. Since many old programs assume
  88  * it will not return more than 1024 and use svc_fdset, return
  89  * maximum of FD_SETSIZE.
  90  */
  91 int
  92 __rpc_dtbsize(void)
  93 {
  94         static int tbsize;
  95         struct rlimit rl;
  96
  97         if (tbsize)
  98                 return (tbsize);
  99         if (getrlimit(RLIMIT_NOFILE, &rl) == 0) {
 100                 tbsize = rl.rlim_max;
 101                 /*
 102                  * backward compatibility; too many places
 103                  * this function is called assuming it returns
 104                  * maximum of 1024.
 105                  */
 106                 if (tbsize > FD_SETSIZE)
 107                         tbsize = FD_SETSIZE;
 108                 return (tbsize);
 109         }
 110         /*
 111          * Something wrong.  I'll try to save face by returning a
 112          * pessimistic number.
 113          */
 114         return (32);
 115 }
 116
 117 /*
 118  * Find the appropriate buffer size
 119  */
 120 uint_t
 121 __rpc_get_t_size(
 122         t_scalar_t size,        /* Size requested */
 123         t_scalar_t bufsize)     /* Supported by the transport */
 124 {
 125         if (bufsize == -2)      /* transfer of data unsupported */
 126                 return (0);
 127         if (size == 0) {
 128                 if ((bufsize == -1) || (bufsize == 0)) {
 129                         /*
 130                          * bufsize == -1 : No limit on the size
 131                          * bufsize == 0 : Concept of tsdu foreign. Choose
 132                          *                      a value.
 133                          */
 134                         return ((uint_t)RPC_MAXDATASIZE);
 135                 }
 136                 return ((uint_t)bufsize);
 137         }
 138         if ((bufsize == -1) || (bufsize == 0))
 139                 return ((uint_t)size);
 140         /* Check whether the value is within the upper max limit */
 141         return (size > bufsize ? (uint_t)bufsize : (uint_t)size);
 142 }
 143
 144 /*
 145  * Find the appropriate address buffer size
 146  */
 147 uint_t
 148 __rpc_get_a_size(
 149         t_scalar_t size)        /* normally tinfo.addr */
 150 {
 151         if (size >= 0)
 152                 return ((uint_t)size);
 153         if (size <= -2)
 154                 return (0);
 155         /*
 156          * (size == -1) No limit on the size. we impose a limit here.
 157          */
 158         return ((uint_t)RPC_MAXADDRSIZE);
 159 }
 160
 161 /*
 162  * Returns the type of the network as defined in <rpc/nettype.h>
 163  * If nettype is NULL, it defaults to NETPATH.
 164  */
 165 static int
 166 getnettype(const char *nettype)
 167 {
 168         int i;
 169
 170         if ((nettype == NULL) || (nettype[0] == '\0'))
 171                 return (_RPC_NETPATH);  /* Default */
 172
 173         for (i = 0; _rpctypelist[i].name; i++)
 174                 if (strcasecmp(nettype, _rpctypelist[i].name) == 0)
 175                         return (_rpctypelist[i].type);
 176         return (_rpctypelist[i].type);
 177 }
 178
 179 /*
 180  * For the given nettype (tcp or udp only), return the first structure found.
 181  * This should be freed by calling freenetconfigent()
 182  */
 183 struct netconfig *
 184 __rpc_getconfip(char *nettype)
 185 {
 186         char *netid;
 187         char *netid_tcp;
 188         char *netid_udp;
 189         static char *netid_tcp_main = NULL;
 190         static char *netid_udp_main = NULL;
 191         static pthread_key_t tcp_key = PTHREAD_ONCE_KEY_NP;
 192         static pthread_key_t udp_key = PTHREAD_ONCE_KEY_NP;
 193         int main_thread;
 194
 195         if ((main_thread = thr_main())) {
 196                 netid_udp = netid_udp_main;
 197                 netid_tcp = netid_tcp_main;
 198         } else {
 199                 (void) pthread_key_create_once_np(&tcp_key, free);
 200                 netid_tcp = pthread_getspecific(tcp_key);
 201                 (void) pthread_key_create_once_np(&udp_key, free);
 202                 netid_udp = pthread_getspecific(udp_key);
 203         }
 204         if (!netid_udp && !netid_tcp) {
 205                 struct netconfig *nconf;
 206                 void *confighandle;
 207
 208                 if (!(confighandle = setnetconfig()))
 209                         return (NULL);
 210                 while (nconf = getnetconfig(confighandle)) {
 211                         if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
 212                                 if (strcmp(nconf->nc_proto, NC_TCP) == 0) {
 213                                         netid_tcp = strdup(nconf->nc_netid);
 214                                         if (netid_tcp == NULL) {
 215                                                 syslog(LOG_ERR,
 216                                                     "__rpc_getconfip : "
 217                                                     "strdup failed");
 218                                                 return (NULL);
 219                                         }
 220                                         if (main_thread)
 221                                                 netid_tcp_main = netid_tcp;
 222                                         else
 223                                                 (void) pthread_setspecific(
 224                                                     tcp_key,
 225                                                     (void *)netid_tcp);
 226                                 } else
 227                                 if (strcmp(nconf->nc_proto, NC_UDP) == 0) {
 228                                         netid_udp = strdup(nconf->nc_netid);
 229                                         if (netid_udp == NULL) {
 230                                                 syslog(LOG_ERR,
 231                                                     "__rpc_getconfip : "
 232                                                     "strdup failed");
 233                                                 return (NULL);
 234                                         }
 235                                         if (main_thread)
 236                                                 netid_udp_main = netid_udp;
 237                                         else
 238                                                 (void) pthread_setspecific(
 239                                                     udp_key,
 240                                                     (void *)netid_udp);
 241                                 }
 242                         }
 243                 }
 244                 (void) endnetconfig(confighandle);
 245         }
 246         if (strcmp(nettype, "udp") == 0)
 247                 netid = netid_udp;
 248         else if (strcmp(nettype, "tcp") == 0)
 249                 netid = netid_tcp;
 250         else
 251                 return (NULL);
 252         if ((netid == NULL) || (netid[0] == '\0'))
 253                 return (NULL);
 254         return (getnetconfigent(netid));
 255 }
 256
 257
 258 /*
 259  * Returns the type of the nettype, which should then be used with
 260  * __rpc_getconf().
 261  */
 262 void *
 263 __rpc_setconf(char *nettype)
 264 {
 265         struct handle *handle;
 266
 267         handle = malloc(sizeof (struct handle));
 268         if (handle == NULL)
 269                 return (NULL);
 270         switch (handle->nettype = getnettype(nettype)) {
 271         case _RPC_DOOR_NETPATH:
 272         case _RPC_NETPATH:
 273         case _RPC_CIRCUIT_N:
 274         case _RPC_DATAGRAM_N:
 275                 if (!(handle->nhandle = setnetpath())) {
 276                         free(handle);
 277                         return (NULL);
 278                 }
 279                 handle->nflag = TRUE;
 280                 break;
 281         case _RPC_VISIBLE:
 282         case _RPC_CIRCUIT_V:
 283         case _RPC_DATAGRAM_V:
 284         case _RPC_TCP:
 285         case _RPC_UDP:
 286         case _RPC_LOCAL:
 287         case _RPC_DOOR_LOCAL:
 288                 if (!(handle->nhandle = setnetconfig())) {
 289                         free(handle);
 290                         return (NULL);
 291                 }
 292                 handle->nflag = FALSE;
 293                 break;
 294         default:
 295                 free(handle);
 296                 return (NULL);
 297         }
 298
 299         return (handle);
 300 }
 301
 302 /*
 303  * Returns the next netconfig struct for the given "net" type.
 304  * __rpc_setconf() should have been called previously.
 305  */
 306 struct netconfig *
 307 __rpc_getconf(void *vhandle)
 308 {
 309         struct handle *handle;
 310         struct netconfig *nconf;
 311
 312         handle = (struct handle *)vhandle;
 313         if (handle == NULL)
 314                 return (NULL);
 315         for (;;) {
 316                 if (handle->nflag)
 317                         nconf = getnetpath(handle->nhandle);
 318                 else
 319                         nconf = getnetconfig(handle->nhandle);
 320                 if (nconf == NULL)
 321                         break;
 322                 if ((nconf->nc_semantics != NC_TPI_CLTS) &&
 323                     (nconf->nc_semantics != NC_TPI_COTS) &&
 324                     (nconf->nc_semantics != NC_TPI_COTS_ORD))
 325                         continue;
 326                 switch (handle->nettype) {
 327                 case _RPC_VISIBLE:
 328                         if (!(nconf->nc_flag & NC_VISIBLE))
 329                                 continue;
 330                         /*FALLTHROUGH*/
 331                 case _RPC_DOOR_NETPATH:
 332                         /*FALLTHROUGH*/
 333                 case _RPC_NETPATH:      /* Be happy */
 334                         break;
 335                 case _RPC_CIRCUIT_V:
 336                         if (!(nconf->nc_flag & NC_VISIBLE))
 337                                 continue;
 338                         /*FALLTHROUGH*/
 339                 case _RPC_CIRCUIT_N:
 340                         if ((nconf->nc_semantics != NC_TPI_COTS) &&
 341                             (nconf->nc_semantics != NC_TPI_COTS_ORD))
 342                                 continue;
 343                         break;
 344                 case _RPC_DATAGRAM_V:
 345                         if (!(nconf->nc_flag & NC_VISIBLE))
 346                                 continue;
 347                         /*FALLTHROUGH*/
 348                 case _RPC_DATAGRAM_N:
 349                         if (nconf->nc_semantics != NC_TPI_CLTS)
 350                                 continue;
 351                         break;
 352                 case _RPC_TCP:
 353                         if (((nconf->nc_semantics != NC_TPI_COTS) &&
 354                             (nconf->nc_semantics != NC_TPI_COTS_ORD)) ||
 355                             (strcmp(nconf->nc_protofmly, NC_INET) &&
 356                             strcmp(nconf->nc_protofmly, NC_INET6)) ||
 357                             strcmp(nconf->nc_proto, NC_TCP))
 358                                 continue;
 359                         break;
 360                 case _RPC_UDP:
 361                         if ((nconf->nc_semantics != NC_TPI_CLTS) ||
 362                             (strcmp(nconf->nc_protofmly, NC_INET) &&
 363                             strcmp(nconf->nc_protofmly, NC_INET6)) ||
 364                             strcmp(nconf->nc_proto, NC_UDP))
 365                                 continue;
 366                         break;
 367                 case _RPC_LOCAL:
 368                 case _RPC_DOOR_LOCAL:
 369                         if (!(nconf->nc_flag & NC_VISIBLE))
 370                                 continue;
 371                         if (strcmp(nconf->nc_protofmly, NC_LOOPBACK))
 372                                 continue;
 373                         break;
 374                 }
 375                 break;
 376         }
 377         return (nconf);
 378 }
 379
 380 void
 381 __rpc_endconf(void *vhandle)
 382 {
 383         struct handle *handle;
 384
 385         handle = (struct handle *)vhandle;
 386         if (handle == NULL)
 387                 return;
 388         if (handle->nflag) {
 389                 (void) endnetpath(handle->nhandle);
 390         } else {
 391                 (void) endnetconfig(handle->nhandle);
 392         }
 393         free(handle);
 394 }
 395
 396 /*
 397  * Used to ping the NULL procedure for clnt handle.
 398  * Returns NULL if fails, else a non-NULL pointer.
 399  */
 400 void *
 401 rpc_nullproc(CLIENT *clnt)
 402 {
 403         struct timeval TIMEOUT = {25, 0};
 404
 405         if (clnt_call(clnt, NULLPROC, (xdrproc_t)xdr_void, NULL,
 406             (xdrproc_t)xdr_void, NULL, TIMEOUT) != RPC_SUCCESS)
 407                 return (NULL);
 408         return ((void *)clnt);
 409 }
 410
 411 /*
 412  * Given a fd, find the transport device it is using and return the
 413  * netconf entry corresponding to it.
 414  * Note: It assumes servtpe parameter is 0 when uninitialized.
 415  *      That is true for xprt->xp_type field.
 416  */
 417 struct netconfig *
 418 __rpcfd_to_nconf(int fd, int servtype)
 419 {
 420         struct stat statbuf;
 421         void *hndl;
 422         struct netconfig *nconf, *newnconf = NULL;
 423         major_t fdmajor;
 424         struct t_info tinfo;
 425
 426         if (fstat(fd, &statbuf) == -1)
 427                 return (NULL);
 428
 429         fdmajor = major(statbuf.st_rdev);
 430         if (servtype == 0) {
 431                 if (t_getinfo(fd, &tinfo) == -1) {
 432                         char errorstr[100];
 433
 434                         __tli_sys_strerror(errorstr, sizeof (errorstr),
 435                             t_errno, errno);
 436                         (void) syslog(LOG_ERR, "__rpcfd_to_nconf : %s : %s",
 437                             "could not get transport information",
 438                             errorstr);
 439                         return (NULL);
 440                 }
 441                 servtype = tinfo.servtype;
 442         }
 443
 444         hndl = setnetconfig();
 445         if (hndl == NULL)
 446                 return (NULL);
 447         /*
 448          * Go through all transports listed in /etc/netconfig looking for
 449          *      transport device in use on fd.
 450          * - Match on service type first
 451          * - if that succeeds, match on major numbers (used for new local
 452          *      transport code that is self cloning)
 453          * - if that fails, assume transport device uses clone driver
 454          *      and try match the fdmajor with minor number of device path
 455          *      which will be the major number of transport device since it
 456          *      uses the clone driver.
 457          */
 458
 459         while (nconf = getnetconfig(hndl)) {
 460                 if (__rpc_matchserv(servtype, nconf->nc_semantics) == TRUE) {
 461                         if (!stat(nconf->nc_device, &statbuf)) {
 462                                 if (fdmajor == major(statbuf.st_rdev))
 463                                         break; /* self cloning driver ? */
 464                                 if (fdmajor == minor(statbuf.st_rdev))
 465                                         break; /* clone driver! */
 466                         }
 467                 }
 468         }
 469         if (nconf)
 470                 newnconf = getnetconfigent(nconf->nc_netid);
 471         (void) endnetconfig(hndl);
 472         return (newnconf);
 473 }
 474
 475 int
 476 __rpc_matchserv(int servtype, unsigned int nc_semantics)
 477 {
 478         switch (servtype) {
 479         case T_COTS:
 480                 if (nc_semantics == NC_TPI_COTS)
 481                         return (TRUE);
 482                 break;
 483
 484         case T_COTS_ORD:
 485                 if (nc_semantics == NC_TPI_COTS_ORD)
 486                         return (TRUE);
 487                 break;
 488
 489         case T_CLTS:
 490                 if (nc_semantics == NC_TPI_CLTS)
 491                         return (TRUE);
 492                 break;
 493
 494         default:
 495                 /* FALSE! */
 496                 break;
 497
 498         }
 499         return (FALSE);
 500 }
 501
 502 /*
 503  * Routines for RPC/Doors support.
 504  */
 505
 506 extern bool_t __inet_netdir_is_my_host(const char *);
 507
 508 bool_t
 509 __rpc_is_local_host(const char *host)
 510 {
 511         char    buf[MAXHOSTNAMELEN + 1];
 512
 513         if (host == NULL || strcmp(host, "localhost") == 0 ||
 514             strcmp(host, HOST_SELF) == 0 ||
 515             strcmp(host, HOST_SELF_CONNECT) == 0 ||
 516             strlen(host) == 0)
 517                 return (TRUE);
 518         if (sysinfo(SI_HOSTNAME, buf, sizeof (buf)) < 0)
 519                 return (FALSE);
 520         if (strcmp(host, buf) == 0)
 521                 return (TRUE);
 522         return (__inet_netdir_is_my_host(host));
 523 }
 524
 525 bool_t
 526 __rpc_try_doors(const char *nettype, bool_t *try_others)
 527 {
 528         switch (getnettype(nettype)) {
 529         case _RPC_DOOR:
 530                 *try_others = FALSE;
 531                 return (TRUE);
 532         case _RPC_DOOR_LOCAL:
 533         case _RPC_DOOR_NETPATH:
 534                 *try_others = TRUE;
 535                 return (TRUE);
 536         default:
 537                 *try_others = TRUE;
 538                 return (FALSE);
 539         }
 540 }