clnt_generic.c revision 1.32
1 /* $NetBSD: clnt_generic.c,v 1.32 2014/05/28 14:41:47 christos 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 /* #ident "@(#)clnt_generic.c 1.20 94/05/03 SMI" */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)clnt_generic.c 1.32 89/03/16 Copyr 1988 Sun Micro"; 43 #else 44 __RCSID("$NetBSD: clnt_generic.c,v 1.32 2014/05/28 14:41:47 christos Exp $"); 45 #endif 46 #endif 47 48 #include "namespace.h" 49 #include "reentrant.h" 50 #include <sys/types.h> 51 #include <sys/socket.h> 52 #include <netinet/in.h> 53 #include <assert.h> 54 #include <stdio.h> 55 #include <errno.h> 56 #include <rpc/rpc.h> 57 #include <rpc/nettype.h> 58 #include <string.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 62 #include "svc_fdset.h" 63 #include "rpc_internal.h" 64 65 #ifdef __weak_alias 66 __weak_alias(clnt_create_vers,_clnt_create_vers) 67 __weak_alias(clnt_create,_clnt_create) 68 __weak_alias(clnt_tp_create,_clnt_tp_create) 69 __weak_alias(clnt_tli_create,_clnt_tli_create) 70 #endif 71 72 /* 73 * Generic client creation with version checking the value of 74 * vers_out is set to the highest server supported value 75 * vers_low <= vers_out <= vers_high AND an error results 76 * if this can not be done. 77 */ 78 CLIENT * 79 clnt_create_vers( 80 const char * hostname, 81 rpcprog_t prog, 82 rpcvers_t * vers_out, 83 rpcvers_t vers_low, 84 rpcvers_t vers_high, 85 const char * nettype) 86 { 87 CLIENT *clnt; 88 struct timeval to; 89 enum clnt_stat rpc_stat; 90 struct rpc_err rpcerr; 91 92 _DIAGASSERT(hostname != NULL); 93 _DIAGASSERT(vers_out != NULL); 94 /* XXX: nettype appears to support being NULL */ 95 96 clnt = clnt_create(hostname, prog, vers_high, nettype); 97 if (clnt == NULL) { 98 return (NULL); 99 } 100 to.tv_sec = 10; 101 to.tv_usec = 0; 102 rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, 103 NULL, (xdrproc_t) xdr_void, NULL, to); 104 if (rpc_stat == RPC_SUCCESS) { 105 *vers_out = vers_high; 106 return (clnt); 107 } 108 if (rpc_stat == RPC_PROGVERSMISMATCH) { 109 unsigned long minvers, maxvers; 110 111 clnt_geterr(clnt, &rpcerr); 112 minvers = rpcerr.re_vers.low; 113 maxvers = rpcerr.re_vers.high; 114 if (maxvers < vers_high) 115 vers_high = (rpcvers_t)maxvers; 116 if (minvers > vers_low) 117 vers_low = (rpcvers_t)minvers; 118 if (vers_low > vers_high) { 119 goto error; 120 } 121 CLNT_CONTROL(clnt, CLSET_VERS, (char *)(void *)&vers_high); 122 rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t) xdr_void, 123 NULL, (xdrproc_t) xdr_void, NULL, to); 124 if (rpc_stat == RPC_SUCCESS) { 125 *vers_out = vers_high; 126 return (clnt); 127 } 128 } 129 clnt_geterr(clnt, &rpcerr); 130 131 error: 132 rpc_createerr.cf_stat = rpc_stat; 133 rpc_createerr.cf_error = rpcerr; 134 clnt_destroy(clnt); 135 return (NULL); 136 } 137 138 /* 139 * Top level client creation routine. 140 * Generic client creation: takes (servers name, program-number, nettype) and 141 * returns client handle. Default options are set, which the user can 142 * change using the rpc equivalent of ioctl()'s. 143 * 144 * It tries for all the netids in that particular class of netid until 145 * it succeeds. 146 * XXX The error message in the case of failure will be the one 147 * pertaining to the last create error. 148 * 149 * It calls clnt_tp_create(); 150 */ 151 CLIENT * 152 clnt_create( 153 const char * hostname, /* server name */ 154 rpcprog_t prog, /* program number */ 155 rpcvers_t vers, /* version number */ 156 const char * nettype) /* net type */ 157 { 158 struct netconfig *nconf; 159 CLIENT *clnt = NULL; 160 void *handle; 161 enum clnt_stat save_cf_stat = RPC_SUCCESS; 162 struct rpc_err save_cf_error; 163 164 _DIAGASSERT(hostname != NULL); 165 /* XXX: nettype appears to support being NULL */ 166 167 if ((handle = __rpc_setconf(nettype)) == NULL) { 168 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 169 return (NULL); 170 } 171 rpc_createerr.cf_stat = RPC_SUCCESS; 172 while (clnt == NULL) { 173 if ((nconf = __rpc_getconf(handle)) == NULL) { 174 if (rpc_createerr.cf_stat == RPC_SUCCESS) 175 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 176 break; 177 } 178 #ifdef CLNT_DEBUG 179 printf("trying netid %s\n", nconf->nc_netid); 180 #endif 181 clnt = clnt_tp_create(hostname, prog, vers, nconf); 182 if (clnt) 183 break; 184 else 185 /* 186 * Since we didn't get a name-to-address 187 * translation failure here, we remember 188 * this particular error. The object of 189 * this is to enable us to return to the 190 * caller a more-specific error than the 191 * unhelpful ``Name to address translation 192 * failed'' which might well occur if we 193 * merely returned the last error (because 194 * the local loopbacks are typically the 195 * last ones in /etc/netconfig and the most 196 * likely to be unable to translate a host 197 * name). 198 */ 199 if (rpc_createerr.cf_stat != RPC_N2AXLATEFAILURE) { 200 save_cf_stat = rpc_createerr.cf_stat; 201 save_cf_error = rpc_createerr.cf_error; 202 } 203 } 204 205 /* 206 * Attempt to return an error more specific than ``Name to address 207 * translation failed'' 208 */ 209 if ((rpc_createerr.cf_stat == RPC_N2AXLATEFAILURE) && 210 (save_cf_stat != RPC_SUCCESS)) { 211 rpc_createerr.cf_stat = save_cf_stat; 212 rpc_createerr.cf_error = save_cf_error; 213 } 214 __rpc_endconf(handle); 215 return (clnt); 216 } 217 218 /* 219 * Generic client creation: takes (servers name, program-number, netconf) and 220 * returns client handle. Default options are set, which the user can 221 * change using the rpc equivalent of ioctl()'s : clnt_control() 222 * It finds out the server address from rpcbind and calls clnt_tli_create() 223 */ 224 CLIENT * 225 clnt_tp_create( 226 const char * hostname, /* server name */ 227 rpcprog_t prog, /* program number */ 228 rpcvers_t vers, /* version number */ 229 const struct netconfig *nconf) /* net config struct */ 230 { 231 struct netbuf *svcaddr; /* servers address */ 232 CLIENT *cl = NULL; /* client handle */ 233 234 _DIAGASSERT(hostname != NULL); 235 /* nconf is handled below */ 236 237 if (nconf == NULL) { 238 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 239 return (NULL); 240 } 241 242 /* 243 * Get the address of the server 244 */ 245 if ((svcaddr = __rpcb_findaddr(prog, vers, nconf, hostname, 246 &cl)) == NULL) { 247 /* appropriate error number is set by rpcbind libraries */ 248 return (NULL); 249 } 250 if (cl == NULL) { 251 cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr, 252 prog, vers, 0, 0); 253 } else { 254 /* Reuse the CLIENT handle and change the appropriate fields */ 255 if (CLNT_CONTROL(cl, CLSET_SVC_ADDR, (void *)svcaddr) == TRUE) { 256 if (cl->cl_netid == NULL) { 257 cl->cl_netid = strdup(nconf->nc_netid); 258 if (cl->cl_netid == NULL) 259 goto out; 260 } 261 if (cl->cl_tp == NULL) { 262 cl->cl_tp = strdup(nconf->nc_device); 263 if (cl->cl_tp == NULL) 264 goto out; 265 } 266 (void) CLNT_CONTROL(cl, CLSET_PROG, (void *)&prog); 267 (void) CLNT_CONTROL(cl, CLSET_VERS, (void *)&vers); 268 } else { 269 CLNT_DESTROY(cl); 270 cl = clnt_tli_create(RPC_ANYFD, nconf, svcaddr, 271 prog, vers, 0, 0); 272 } 273 } 274 free(svcaddr->buf); 275 free(svcaddr); 276 return (cl); 277 out: 278 clnt_destroy(cl); 279 return NULL; 280 } 281 282 /* 283 * Generic client creation: returns client handle. 284 * Default options are set, which the user can 285 * change using the rpc equivalent of ioctl()'s : clnt_control(). 286 * If fd is RPC_ANYFD, it will be opened using nconf. 287 * It will be bound if not so. 288 * If sizes are 0; appropriate defaults will be chosen. 289 */ 290 CLIENT * 291 clnt_tli_create( 292 int fd, /* fd */ 293 const struct netconfig *nconf, /* netconfig structure */ 294 const struct netbuf *svcaddr, /* servers address */ 295 rpcprog_t prog, /* program number */ 296 rpcvers_t vers, /* version number */ 297 u_int sendsz, /* send size */ 298 u_int recvsz) /* recv size */ 299 { 300 CLIENT *cl; /* client handle */ 301 bool_t madefd = FALSE; /* whether fd opened here */ 302 long servtype; 303 struct __rpc_sockinfo si; 304 305 /* nconf is handled below */ 306 _DIAGASSERT(svcaddr != NULL); 307 308 if (fd == RPC_ANYFD) { 309 if (nconf == NULL) { 310 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 311 return (NULL); 312 } 313 314 fd = __rpc_nconf2fd(nconf); 315 316 if (fd == -1) 317 goto err; 318 319 madefd = TRUE; 320 servtype = nconf->nc_semantics; 321 if (!__rpc_fd2sockinfo(fd, &si)) 322 goto err; 323 324 (void)bindresvport(fd, NULL); 325 } else { 326 if (!__rpc_fd2sockinfo(fd, &si)) 327 goto err; 328 servtype = __rpc_socktype2seman(si.si_socktype); 329 if (servtype == -1) { 330 rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; 331 return NULL; 332 } 333 334 } 335 336 if (si.si_af != ((struct sockaddr *)svcaddr->buf)->sa_family) { 337 rpc_createerr.cf_stat = RPC_UNKNOWNHOST; /* XXX */ 338 goto err1; 339 } 340 341 switch (servtype) { 342 case NC_TPI_COTS_ORD: 343 cl = clnt_vc_create(fd, svcaddr, prog, vers, sendsz, recvsz); 344 if (!nconf || !cl) 345 break; 346 __rpc_setnodelay(fd, &si); 347 break; 348 case NC_TPI_CLTS: 349 cl = clnt_dg_create(fd, svcaddr, prog, vers, sendsz, recvsz); 350 break; 351 default: 352 goto err; 353 } 354 355 if (cl == NULL) 356 goto err1; /* borrow errors from clnt_dg/vc creates */ 357 if (nconf) { 358 cl->cl_netid = strdup(nconf->nc_netid); 359 if (cl->cl_netid == NULL) 360 goto err0; 361 cl->cl_tp = strdup(nconf->nc_device); 362 if (cl->cl_tp == NULL) 363 goto err0; 364 } else { 365 cl->cl_netid = __UNCONST(""); 366 cl->cl_tp = __UNCONST(""); 367 } 368 if (madefd) { 369 (void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL); 370 /* (void) CLNT_CONTROL(cl, CLSET_POP_TIMOD, NULL); */ 371 }; 372 373 return (cl); 374 375 err0: 376 clnt_destroy(cl); 377 err: 378 rpc_createerr.cf_stat = RPC_SYSTEMERROR; 379 rpc_createerr.cf_error.re_errno = errno; 380 err1: if (madefd) 381 (void) close(fd); 382 return (NULL); 383 } 384 385 /* 386 * Don't block thse so interactive programs don't get stuck in lalaland. 387 * (easier to do this than making connect(2) non-blocking..) 388 */ 389 int 390 __clnt_sigfillset(sigset_t *ss) { 391 static const int usersig[] = { 392 SIGHUP, SIGINT, SIGQUIT, SIGTERM, SIGTSTP 393 }; 394 if (sigfillset(ss) == -1) 395 return -1; 396 for (size_t i = 0; i < __arraycount(usersig); i++) 397 if (sigdelset(ss, usersig[i]) == -1) 398 return -1; 399 return 0; 400 } 401
Indexes created Sun Sep 21 19:09:51 GMT 2025