1 /* $NetBSD: rpc_prot.c,v 1.16 2000/06/02 23:11:13 fvdl Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2009, Sun Microsystems, Inc. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are met: 11 * - Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * - Redistributions in binary form must reproduce the above copyright notice, 14 * this list of conditions and the following disclaimer in the documentation 15 * and/or other materials provided with the distribution. 16 * - Neither the name of Sun Microsystems, 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 "AS IS" 21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char *sccsid2 = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro"; 35 static char *sccsid = "@(#)rpc_prot.c 2.3 88/08/07 4.0 RPCSRC"; 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * rpc_prot.c 42 * 43 * Copyright (C) 1984, Sun Microsystems, Inc. 44 * 45 * This set of routines implements the rpc message definition, 46 * its serializer and some common rpc utility routines. 47 * The routines are meant for various implementations of rpc - 48 * they are NOT for the rpc client or rpc service implementations! 49 * Because authentication stuff is easy and is part of rpc, the opaque 50 * routines are also in this program. 51 */ 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/kernel.h> 56 #include <sys/malloc.h> 57 58 #include <rpc/types.h> 59 #include <rpc/xdr.h> 60 #include <rpc/auth.h> 61 #include <rpc/clnt.h> 62 #include <rpc/rpc_msg.h> 63 64 #define assert(exp) KASSERT(exp, ("bad arguments")) 65 66 static enum clnt_stat accepted(enum accept_stat, struct rpc_err *); 67 static enum clnt_stat rejected(enum reject_stat, struct rpc_err *); 68 69 /* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */ 70 71 struct opaque_auth _null_auth; 72 73 /* 74 * XDR an opaque authentication struct 75 * (see auth.h) 76 */ 77 bool_t 78 xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap) 79 { 80 81 assert(xdrs != NULL); 82 assert(ap != NULL); 83 84 if (xdr_enum(xdrs, &(ap->oa_flavor))) 85 return (xdr_bytes(xdrs, &ap->oa_base, 86 &ap->oa_length, MAX_AUTH_BYTES)); 87 return (FALSE); 88 } 89 90 /* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */ 91 92 /* 93 * XDR the MSG_ACCEPTED part of a reply message union 94 */ 95 bool_t 96 xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar) 97 { 98 enum accept_stat *par_stat; 99 100 assert(xdrs != NULL); 101 assert(ar != NULL); 102 103 par_stat = &ar->ar_stat; 104 105 /* personalized union, rather than calling xdr_union */ 106 if (! xdr_opaque_auth(xdrs, &(ar->ar_verf))) 107 return (FALSE); 108 if (! xdr_enum(xdrs, (enum_t *) par_stat)) 109 return (FALSE); 110 switch (ar->ar_stat) { 111 112 case SUCCESS: 113 if (ar->ar_results.proc != (xdrproc_t) xdr_void) 114 return ((*(ar->ar_results.proc))(xdrs, 115 ar->ar_results.where)); 116 else 117 return (TRUE); 118 119 case PROG_MISMATCH: 120 if (! xdr_uint32_t(xdrs, &(ar->ar_vers.low))) 121 return (FALSE); 122 return (xdr_uint32_t(xdrs, &(ar->ar_vers.high))); 123 124 case GARBAGE_ARGS: 125 case SYSTEM_ERR: 126 case PROC_UNAVAIL: 127 case PROG_UNAVAIL: 128 break; 129 } 130 return (TRUE); /* TRUE => open ended set of problems */ 131 } 132 133 /* 134 * XDR the MSG_DENIED part of a reply message union 135 */ 136 bool_t 137 xdr_rejected_reply(XDR *xdrs, struct rejected_reply *rr) 138 { 139 enum reject_stat *prj_stat; 140 enum auth_stat *prj_why; 141 142 assert(xdrs != NULL); 143 assert(rr != NULL); 144 145 prj_stat = &rr->rj_stat; 146 147 /* personalized union, rather than calling xdr_union */ 148 if (! xdr_enum(xdrs, (enum_t *) prj_stat)) 149 return (FALSE); 150 switch (rr->rj_stat) { 151 152 case RPC_MISMATCH: 153 if (! xdr_uint32_t(xdrs, &(rr->rj_vers.low))) 154 return (FALSE); 155 return (xdr_uint32_t(xdrs, &(rr->rj_vers.high))); 156 157 case AUTH_ERROR: 158 prj_why = &rr->rj_why; 159 return (xdr_enum(xdrs, (enum_t *) prj_why)); 160 } 161 /* NOTREACHED */ 162 assert(0); 163 return (FALSE); 164 } 165 166 static const struct xdr_discrim reply_dscrm[3] = { 167 { (int)MSG_ACCEPTED, (xdrproc_t)xdr_accepted_reply }, 168 { (int)MSG_DENIED, (xdrproc_t)xdr_rejected_reply }, 169 { __dontcare__, NULL_xdrproc_t } }; 170 171 /* 172 * XDR a reply message 173 */ 174 bool_t 175 xdr_replymsg(XDR *xdrs, struct rpc_msg *rmsg) 176 { 177 int32_t *buf; 178 enum msg_type *prm_direction; 179 enum reply_stat *prp_stat; 180 181 assert(xdrs != NULL); 182 assert(rmsg != NULL); 183 184 if (xdrs->x_op == XDR_DECODE) { 185 buf = XDR_INLINE(xdrs, 3 * BYTES_PER_XDR_UNIT); 186 if (buf != NULL) { 187 rmsg->rm_xid = IXDR_GET_UINT32(buf); 188 rmsg->rm_direction = IXDR_GET_ENUM(buf, enum msg_type); 189 if (rmsg->rm_direction != REPLY) { 190 return (FALSE); 191 } 192 rmsg->rm_reply.rp_stat = 193 IXDR_GET_ENUM(buf, enum reply_stat); 194 if (rmsg->rm_reply.rp_stat == MSG_ACCEPTED) 195 return (xdr_accepted_reply(xdrs, 196 &rmsg->acpted_rply)); 197 else if (rmsg->rm_reply.rp_stat == MSG_DENIED) 198 return (xdr_rejected_reply(xdrs, 199 &rmsg->rjcted_rply)); 200 else 201 return (FALSE); 202 } 203 } 204 205 prm_direction = &rmsg->rm_direction; 206 prp_stat = &rmsg->rm_reply.rp_stat; 207 208 if ( 209 xdr_uint32_t(xdrs, &(rmsg->rm_xid)) && 210 xdr_enum(xdrs, (enum_t *) prm_direction) && 211 (rmsg->rm_direction == REPLY) ) 212 return (xdr_union(xdrs, (enum_t *) prp_stat, 213 (caddr_t)(void *)&(rmsg->rm_reply.ru), reply_dscrm, 214 NULL_xdrproc_t)); 215 return (FALSE); 216 } 217 218 219 /* 220 * Serializes the "static part" of a call message header. 221 * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers. 222 * The rm_xid is not really static, but the user can easily munge on the fly. 223 */ 224 bool_t 225 xdr_callhdr(XDR *xdrs, struct rpc_msg *cmsg) 226 { 227 enum msg_type *prm_direction; 228 229 assert(xdrs != NULL); 230 assert(cmsg != NULL); 231 232 prm_direction = &cmsg->rm_direction; 233 234 cmsg->rm_direction = CALL; 235 cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION; 236 if ( 237 (xdrs->x_op == XDR_ENCODE) && 238 xdr_uint32_t(xdrs, &(cmsg->rm_xid)) && 239 xdr_enum(xdrs, (enum_t *) prm_direction) && 240 xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) && 241 xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_prog)) ) 242 return (xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_vers))); 243 return (FALSE); 244 } 245 246 /* ************************** Client utility routine ************* */ 247 248 static enum clnt_stat 249 accepted(enum accept_stat acpt_stat, struct rpc_err *error) 250 { 251 252 assert(error != NULL); 253 254 switch (acpt_stat) { 255 256 case PROG_UNAVAIL: 257 error->re_status = RPC_PROGUNAVAIL; 258 return (RPC_PROGUNAVAIL); 259 260 case PROG_MISMATCH: 261 error->re_status = RPC_PROGVERSMISMATCH; 262 return (RPC_PROGVERSMISMATCH); 263 264 case PROC_UNAVAIL: 265 return (RPC_PROCUNAVAIL); 266 267 case GARBAGE_ARGS: 268 return (RPC_CANTDECODEARGS); 269 270 case SYSTEM_ERR: 271 return (RPC_SYSTEMERROR); 272 273 case SUCCESS: 274 return (RPC_SUCCESS); 275 } 276 /* NOTREACHED */ 277 /* something's wrong, but we don't know what ... */ 278 error->re_lb.s1 = (int32_t)MSG_ACCEPTED; 279 error->re_lb.s2 = (int32_t)acpt_stat; 280 return (RPC_FAILED); 281 } 282 283 static enum clnt_stat 284 rejected(enum reject_stat rjct_stat, struct rpc_err *error) 285 { 286 287 assert(error != NULL); 288 289 switch (rjct_stat) { 290 case RPC_MISMATCH: 291 return (RPC_VERSMISMATCH); 292 293 case AUTH_ERROR: 294 return (RPC_AUTHERROR); 295 } 296 /* something's wrong, but we don't know what ... */ 297 /* NOTREACHED */ 298 error->re_lb.s1 = (int32_t)MSG_DENIED; 299 error->re_lb.s2 = (int32_t)rjct_stat; 300 return (RPC_FAILED); 301 } 302 303 /* 304 * given a reply message, fills in the error 305 */ 306 enum clnt_stat 307 _seterr_reply(struct rpc_msg *msg, struct rpc_err *error) 308 { 309 enum clnt_stat stat; 310 311 assert(msg != NULL); 312 assert(error != NULL); 313 314 /* optimized for normal, SUCCESSful case */ 315 switch (msg->rm_reply.rp_stat) { 316 317 case MSG_ACCEPTED: 318 if (msg->acpted_rply.ar_stat == SUCCESS) { 319 stat = RPC_SUCCESS; 320 return (stat); 321 } 322 stat = accepted(msg->acpted_rply.ar_stat, error); 323 break; 324 325 case MSG_DENIED: 326 stat = rejected(msg->rjcted_rply.rj_stat, error); 327 break; 328 329 default: 330 stat = RPC_FAILED; 331 error->re_lb.s1 = (int32_t)(msg->rm_reply.rp_stat); 332 break; 333 } 334 error->re_status = stat; 335 336 switch (stat) { 337 338 case RPC_VERSMISMATCH: 339 error->re_vers.low = msg->rjcted_rply.rj_vers.low; 340 error->re_vers.high = msg->rjcted_rply.rj_vers.high; 341 break; 342 343 case RPC_AUTHERROR: 344 error->re_why = msg->rjcted_rply.rj_why; 345 break; 346 347 case RPC_PROGVERSMISMATCH: 348 error->re_vers.low = msg->acpted_rply.ar_vers.low; 349 error->re_vers.high = msg->acpted_rply.ar_vers.high; 350 break; 351 352 case RPC_FAILED: 353 case RPC_SUCCESS: 354 case RPC_PROGNOTREGISTERED: 355 case RPC_PMAPFAILURE: 356 case RPC_UNKNOWNPROTO: 357 case RPC_UNKNOWNHOST: 358 case RPC_SYSTEMERROR: 359 case RPC_CANTDECODEARGS: 360 case RPC_PROCUNAVAIL: 361 case RPC_PROGUNAVAIL: 362 case RPC_TIMEDOUT: 363 case RPC_CANTRECV: 364 case RPC_CANTSEND: 365 case RPC_CANTDECODERES: 366 case RPC_CANTENCODEARGS: 367 default: 368 break; 369 } 370 371 return (stat); 372 } 373