lib/libc/rpc/rpc_prot.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)rpc_prot.c       2.3 88/08/07 4.0 RPCSRC
  31  * $NetBSD: rpc_prot.c,v 1.16 2000/06/02 23:11:13 fvdl Exp $
  32  * $FreeBSD: src/lib/libc/rpc/rpc_prot.c,v 1.13 2007/11/20 01:51:20 jb Exp $
  33  * $DragonFly: src/lib/libc/rpc/rpc_prot.c,v 1.4 2005/11/13 12:27:04 swildner Exp $
  34  */
  35
  36 /*
  37  * rpc_prot.c
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  *
  41  * This set of routines implements the rpc message definition,
  42  * its serializer and some common rpc utility routines.
  43  * The routines are meant for various implementations of rpc -
  44  * they are NOT for the rpc client or rpc service implementations!
  45  * Because authentication stuff is easy and is part of rpc, the opaque
  46  * routines are also in this program.
  47  */
  48
  49 #include "namespace.h"
  50 #include <sys/param.h>
  51
  52 #include <assert.h>
  53
  54 #include <rpc/rpc.h>
  55 #include "un-namespace.h"
  56
  57 static void accepted(enum accept_stat, struct rpc_err *);
  58 static void rejected(enum reject_stat, struct rpc_err *);
  59
  60 /* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */
  61
  62 extern struct opaque_auth _null_auth;
  63
  64 /*
  65  * XDR an opaque authentication struct
  66  * (see auth.h)
  67  */
  68 bool_t
  69 xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)
  70 {
  71
  72         assert(xdrs != NULL);
  73         assert(ap != NULL);
  74
  75         if (xdr_enum(xdrs, &(ap->oa_flavor)))
  76                 return (xdr_bytes(xdrs, &ap->oa_base,
  77                         &ap->oa_length, MAX_AUTH_BYTES));
  78         return (FALSE);
  79 }
  80
  81 /*
  82  * XDR a DES block
  83  */
  84 bool_t
  85 xdr_des_block(XDR *xdrs, des_block *blkp)
  86 {
  87
  88         assert(xdrs != NULL);
  89         assert(blkp != NULL);
  90
  91         return (xdr_opaque(xdrs, (caddr_t)(void *)blkp, sizeof(des_block)));
  92 }
  93
  94 /* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */
  95
  96 /*
  97  * XDR the MSG_ACCEPTED part of a reply message union
  98  */
  99 bool_t
 100 xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar)
 101 {
 102         enum accept_stat *par_stat;
 103
 104         assert(xdrs != NULL);
 105         assert(ar != NULL);
 106
 107         par_stat = &ar->ar_stat;
 108
 109         /* personalized union, rather than calling xdr_union */
 110         if (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))
 111                 return (FALSE);
 112         if (! xdr_enum(xdrs, (enum_t *) par_stat))
 113                 return (FALSE);
 114         switch (ar->ar_stat) {
 115
 116         case SUCCESS:
 117                 return ((*(ar->ar_results.proc))(xdrs, ar->ar_results.where));
 118
 119         case PROG_MISMATCH:
 120                 if (! xdr_u_int32_t(xdrs, &(ar->ar_vers.low)))
 121                         return (FALSE);
 122                 return (xdr_u_int32_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_u_int32_t(xdrs, &(rr->rj_vers.low)))
 154                         return (FALSE);
 155                 return (xdr_u_int32_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         enum msg_type *prm_direction;
 178         enum reply_stat *prp_stat;
 179
 180         assert(xdrs != NULL);
 181         assert(rmsg != NULL);
 182
 183         prm_direction = &rmsg->rm_direction;
 184         prp_stat = &rmsg->rm_reply.rp_stat;
 185
 186         if (
 187             xdr_u_int32_t(xdrs, &(rmsg->rm_xid)) &&
 188             xdr_enum(xdrs, (enum_t *) prm_direction) &&
 189             (rmsg->rm_direction == REPLY) )
 190                 return (xdr_union(xdrs, (enum_t *) prp_stat,
 191                    (caddr_t)(void *)&(rmsg->rm_reply.ru), reply_dscrm,
 192                    NULL_xdrproc_t));
 193         return (FALSE);
 194 }
 195
 196
 197 /*
 198  * Serializes the "static part" of a call message header.
 199  * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.
 200  * The rm_xid is not really static, but the user can easily munge on the fly.
 201  */
 202 bool_t
 203 xdr_callhdr(XDR *xdrs, struct rpc_msg *cmsg)
 204 {
 205         enum msg_type *prm_direction;
 206
 207         assert(xdrs != NULL);
 208         assert(cmsg != NULL);
 209
 210         prm_direction = &cmsg->rm_direction;
 211
 212         cmsg->rm_direction = CALL;
 213         cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
 214         if (
 215             (xdrs->x_op == XDR_ENCODE) &&
 216             xdr_u_int32_t(xdrs, &(cmsg->rm_xid)) &&
 217             xdr_enum(xdrs, (enum_t *) prm_direction) &&
 218             xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
 219             xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_prog)) )
 220                 return (xdr_u_int32_t(xdrs, &(cmsg->rm_call.cb_vers)));
 221         return (FALSE);
 222 }
 223
 224 /* ************************** Client utility routine ************* */
 225
 226 static void
 227 accepted(enum accept_stat acpt_stat, struct rpc_err *error)
 228 {
 229
 230         assert(error != NULL);
 231
 232         switch (acpt_stat) {
 233
 234         case PROG_UNAVAIL:
 235                 error->re_status = RPC_PROGUNAVAIL;
 236                 return;
 237
 238         case PROG_MISMATCH:
 239                 error->re_status = RPC_PROGVERSMISMATCH;
 240                 return;
 241
 242         case PROC_UNAVAIL:
 243                 error->re_status = RPC_PROCUNAVAIL;
 244                 return;
 245
 246         case GARBAGE_ARGS:
 247                 error->re_status = RPC_CANTDECODEARGS;
 248                 return;
 249
 250         case SYSTEM_ERR:
 251                 error->re_status = RPC_SYSTEMERROR;
 252                 return;
 253
 254         case SUCCESS:
 255                 error->re_status = RPC_SUCCESS;
 256                 return;
 257         }
 258         /* NOTREACHED */
 259         /* something's wrong, but we don't know what ... */
 260         error->re_status = RPC_FAILED;
 261         error->re_lb.s1 = (int32_t)MSG_ACCEPTED;
 262         error->re_lb.s2 = (int32_t)acpt_stat;
 263 }
 264
 265 static void
 266 rejected(enum reject_stat rjct_stat, struct rpc_err *error)
 267 {
 268
 269         assert(error != NULL);
 270
 271         switch (rjct_stat) {
 272         case RPC_MISMATCH:
 273                 error->re_status = RPC_VERSMISMATCH;
 274                 return;
 275
 276         case AUTH_ERROR:
 277                 error->re_status = RPC_AUTHERROR;
 278                 return;
 279         }
 280         /* something's wrong, but we don't know what ... */
 281         /* NOTREACHED */
 282         error->re_status = RPC_FAILED;
 283         error->re_lb.s1 = (int32_t)MSG_DENIED;
 284         error->re_lb.s2 = (int32_t)rjct_stat;
 285 }
 286
 287 /*
 288  * given a reply message, fills in the error
 289  */
 290 void
 291 _seterr_reply(struct rpc_msg *msg, struct rpc_err *error)
 292 {
 293
 294         assert(msg != NULL);
 295         assert(error != NULL);
 296
 297         /* optimized for normal, SUCCESSful case */
 298         switch (msg->rm_reply.rp_stat) {
 299
 300         case MSG_ACCEPTED:
 301                 if (msg->acpted_rply.ar_stat == SUCCESS) {
 302                         error->re_status = RPC_SUCCESS;
 303                         return;
 304                 }
 305                 accepted(msg->acpted_rply.ar_stat, error);
 306                 break;
 307
 308         case MSG_DENIED:
 309                 rejected(msg->rjcted_rply.rj_stat, error);
 310                 break;
 311
 312         default:
 313                 error->re_status = RPC_FAILED;
 314                 error->re_lb.s1 = (int32_t)(msg->rm_reply.rp_stat);
 315                 break;
 316         }
 317         switch (error->re_status) {
 318
 319         case RPC_VERSMISMATCH:
 320                 error->re_vers.low = msg->rjcted_rply.rj_vers.low;
 321                 error->re_vers.high = msg->rjcted_rply.rj_vers.high;
 322                 break;
 323
 324         case RPC_AUTHERROR:
 325                 error->re_why = msg->rjcted_rply.rj_why;
 326                 break;
 327
 328         case RPC_PROGVERSMISMATCH:
 329                 error->re_vers.low = msg->acpted_rply.ar_vers.low;
 330                 error->re_vers.high = msg->acpted_rply.ar_vers.high;
 331                 break;
 332
 333         case RPC_FAILED:
 334         case RPC_SUCCESS:
 335         case RPC_PROGNOTREGISTERED:
 336         case RPC_PMAPFAILURE:
 337         case RPC_UNKNOWNPROTO:
 338         case RPC_UNKNOWNHOST:
 339         case RPC_SYSTEMERROR:
 340         case RPC_CANTDECODEARGS:
 341         case RPC_PROCUNAVAIL:
 342         case RPC_PROGUNAVAIL:
 343         case RPC_TIMEDOUT:
 344         case RPC_CANTRECV:
 345         case RPC_CANTSEND:
 346         case RPC_CANTDECODERES:
 347         case RPC_CANTENCODEARGS:
 348         default:
 349                 break;
 350         }
 351 }