The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/rpc/rpc_prot.c

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    1 /*      $NetBSD: rpc_prot.c,v 1.16 2000/06/02 23:11:13 fvdl Exp $       */
    2 
    3 /*-
    4  * Copyright (c) 2009, Sun Microsystems, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without 
    8  * modification, are permitted provided that the following conditions are met:
    9  * - Redistributions of source code must retain the above copyright notice, 
   10  *   this list of conditions and the following disclaimer.
   11  * - Redistributions in binary form must reproduce the above copyright notice, 
   12  *   this list of conditions and the following disclaimer in the documentation 
   13  *   and/or other materials provided with the distribution.
   14  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   15  *   contributors may be used to endorse or promote products derived 
   16  *   from this software without specific prior written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #if defined(LIBC_SCCS) && !defined(lint)
   32 static char *sccsid2 = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
   33 static char *sccsid = "@(#)rpc_prot.c   2.3 88/08/07 4.0 RPCSRC";
   34 #endif
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.2/sys/rpc/rpc_prot.c 331722 2018-03-29 02:50:57Z eadler $");
   37 
   38 /*
   39  * rpc_prot.c
   40  *
   41  * Copyright (C) 1984, Sun Microsystems, Inc.
   42  *
   43  * This set of routines implements the rpc message definition,
   44  * its serializer and some common rpc utility routines.
   45  * The routines are meant for various implementations of rpc -
   46  * they are NOT for the rpc client or rpc service implementations!
   47  * Because authentication stuff is easy and is part of rpc, the opaque
   48  * routines are also in this program.
   49  */
   50 
   51 #include <sys/param.h>
   52 #include <sys/systm.h>
   53 #include <sys/kernel.h>
   54 #include <sys/malloc.h>
   55 
   56 #include <rpc/types.h>
   57 #include <rpc/xdr.h>
   58 #include <rpc/auth.h>
   59 #include <rpc/clnt.h>
   60 #include <rpc/rpc_msg.h>
   61 
   62 MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
   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 }

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