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  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    5  * unrestricted use provided that this legend is included on all tape
    6  * media and as a part of the software program in whole or part.  Users
    7  * may copy or modify Sun RPC without charge, but are not authorized
    8  * to license or distribute it to anyone else except as part of a product or
    9  * program developed by the user.
   10  *
   11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   14  *
   15  * Sun RPC is provided with no support and without any obligation on the
   16  * part of Sun Microsystems, Inc. to assist in its use, correction,
   17  * modification or enhancement.
   18  *
   19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   21  * OR ANY PART THEREOF.
   22  *
   23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   24  * or profits or other special, indirect and consequential damages, even if
   25  * Sun has been advised of the possibility of such damages.
   26  *
   27  * Sun Microsystems, Inc.
   28  * 2550 Garcia Avenue
   29  * Mountain View, California  94043
   30  */
   31 
   32 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char *sccsid2 = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
   34 static char *sccsid = "@(#)rpc_prot.c   2.3 88/08/07 4.0 RPCSRC";
   35 #endif
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 /*
   40  * rpc_prot.c
   41  *
   42  * Copyright (C) 1984, Sun Microsystems, Inc.
   43  *
   44  * This set of routines implements the rpc message definition,
   45  * its serializer and some common rpc utility routines.
   46  * The routines are meant for various implementations of rpc -
   47  * they are NOT for the rpc client or rpc service implementations!
   48  * Because authentication stuff is easy and is part of rpc, the opaque
   49  * routines are also in this program.
   50  */
   51 
   52 #include <sys/param.h>
   53 #include <sys/systm.h>
   54 #include <sys/kernel.h>
   55 #include <sys/malloc.h>
   56 
   57 #include <rpc/types.h>
   58 #include <rpc/xdr.h>
   59 #include <rpc/auth.h>
   60 #include <rpc/clnt.h>
   61 #include <rpc/rpc_msg.h>
   62 
   63 MALLOC_DEFINE(M_RPC, "rpc", "Remote Procedure Call");
   64 
   65 #define assert(exp)     KASSERT(exp, ("bad arguments"))
   66 
   67 static void accepted(enum accept_stat, struct rpc_err *);
   68 static void rejected(enum reject_stat, struct rpc_err *);
   69 
   70 /* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */
   71 
   72 struct opaque_auth _null_auth;
   73 
   74 /*
   75  * XDR an opaque authentication struct
   76  * (see auth.h)
   77  */
   78 bool_t
   79 xdr_opaque_auth(XDR *xdrs, struct opaque_auth *ap)
   80 {
   81 
   82         assert(xdrs != NULL);
   83         assert(ap != NULL);
   84 
   85         if (xdr_enum(xdrs, &(ap->oa_flavor)))
   86                 return (xdr_bytes(xdrs, &ap->oa_base,
   87                         &ap->oa_length, MAX_AUTH_BYTES));
   88         return (FALSE);
   89 }
   90 
   91 /* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */
   92 
   93 /*
   94  * XDR the MSG_ACCEPTED part of a reply message union
   95  */
   96 bool_t
   97 xdr_accepted_reply(XDR *xdrs, struct accepted_reply *ar)
   98 {
   99         enum accept_stat *par_stat;
  100 
  101         assert(xdrs != NULL);
  102         assert(ar != NULL);
  103 
  104         par_stat = &ar->ar_stat;
  105 
  106         /* personalized union, rather than calling xdr_union */
  107         if (! xdr_opaque_auth(xdrs, &(ar->ar_verf)))
  108                 return (FALSE);
  109         if (! xdr_enum(xdrs, (enum_t *) par_stat))
  110                 return (FALSE);
  111         switch (ar->ar_stat) {
  112 
  113         case SUCCESS:
  114                 return ((*(ar->ar_results.proc))(xdrs, ar->ar_results.where));
  115 
  116         case PROG_MISMATCH:
  117                 if (! xdr_uint32_t(xdrs, &(ar->ar_vers.low)))
  118                         return (FALSE);
  119                 return (xdr_uint32_t(xdrs, &(ar->ar_vers.high)));
  120 
  121         case GARBAGE_ARGS:
  122         case SYSTEM_ERR:
  123         case PROC_UNAVAIL:
  124         case PROG_UNAVAIL:
  125                 break;
  126         }
  127         return (TRUE);  /* TRUE => open ended set of problems */
  128 }
  129 
  130 /*
  131  * XDR the MSG_DENIED part of a reply message union
  132  */
  133 bool_t 
  134 xdr_rejected_reply(XDR *xdrs, struct rejected_reply *rr)
  135 {
  136         enum reject_stat *prj_stat;
  137         enum auth_stat *prj_why;
  138 
  139         assert(xdrs != NULL);
  140         assert(rr != NULL);
  141 
  142         prj_stat = &rr->rj_stat;
  143 
  144         /* personalized union, rather than calling xdr_union */
  145         if (! xdr_enum(xdrs, (enum_t *) prj_stat))
  146                 return (FALSE);
  147         switch (rr->rj_stat) {
  148 
  149         case RPC_MISMATCH:
  150                 if (! xdr_uint32_t(xdrs, &(rr->rj_vers.low)))
  151                         return (FALSE);
  152                 return (xdr_uint32_t(xdrs, &(rr->rj_vers.high)));
  153 
  154         case AUTH_ERROR:
  155                 prj_why = &rr->rj_why;
  156                 return (xdr_enum(xdrs, (enum_t *) prj_why));
  157         }
  158         /* NOTREACHED */
  159         assert(0);
  160         return (FALSE);
  161 }
  162 
  163 static const struct xdr_discrim reply_dscrm[3] = {
  164         { (int)MSG_ACCEPTED, (xdrproc_t)xdr_accepted_reply },
  165         { (int)MSG_DENIED, (xdrproc_t)xdr_rejected_reply },
  166         { __dontcare__, NULL_xdrproc_t } };
  167 
  168 /*
  169  * XDR a reply message
  170  */
  171 bool_t
  172 xdr_replymsg(XDR *xdrs, struct rpc_msg *rmsg)
  173 {
  174         enum msg_type *prm_direction;
  175         enum reply_stat *prp_stat;
  176 
  177         assert(xdrs != NULL);
  178         assert(rmsg != NULL);
  179 
  180         prm_direction = &rmsg->rm_direction;
  181         prp_stat = &rmsg->rm_reply.rp_stat;
  182 
  183         if (
  184             xdr_uint32_t(xdrs, &(rmsg->rm_xid)) && 
  185             xdr_enum(xdrs, (enum_t *) prm_direction) &&
  186             (rmsg->rm_direction == REPLY) )
  187                 return (xdr_union(xdrs, (enum_t *) prp_stat,
  188                    (caddr_t)(void *)&(rmsg->rm_reply.ru), reply_dscrm,
  189                    NULL_xdrproc_t));
  190         return (FALSE);
  191 }
  192 
  193 
  194 /*
  195  * Serializes the "static part" of a call message header.
  196  * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.
  197  * The rm_xid is not really static, but the user can easily munge on the fly.
  198  */
  199 bool_t
  200 xdr_callhdr(XDR *xdrs, struct rpc_msg *cmsg)
  201 {
  202         enum msg_type *prm_direction;
  203 
  204         assert(xdrs != NULL);
  205         assert(cmsg != NULL);
  206 
  207         prm_direction = &cmsg->rm_direction;
  208 
  209         cmsg->rm_direction = CALL;
  210         cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
  211         if (
  212             (xdrs->x_op == XDR_ENCODE) &&
  213             xdr_uint32_t(xdrs, &(cmsg->rm_xid)) &&
  214             xdr_enum(xdrs, (enum_t *) prm_direction) &&
  215             xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
  216             xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_prog)) )
  217                 return (xdr_uint32_t(xdrs, &(cmsg->rm_call.cb_vers)));
  218         return (FALSE);
  219 }
  220 
  221 /* ************************** Client utility routine ************* */
  222 
  223 static void
  224 accepted(enum accept_stat acpt_stat, struct rpc_err *error)
  225 {
  226 
  227         assert(error != NULL);
  228 
  229         switch (acpt_stat) {
  230 
  231         case PROG_UNAVAIL:
  232                 error->re_status = RPC_PROGUNAVAIL;
  233                 return;
  234 
  235         case PROG_MISMATCH:
  236                 error->re_status = RPC_PROGVERSMISMATCH;
  237                 return;
  238 
  239         case PROC_UNAVAIL:
  240                 error->re_status = RPC_PROCUNAVAIL;
  241                 return;
  242 
  243         case GARBAGE_ARGS:
  244                 error->re_status = RPC_CANTDECODEARGS;
  245                 return;
  246 
  247         case SYSTEM_ERR:
  248                 error->re_status = RPC_SYSTEMERROR;
  249                 return;
  250 
  251         case SUCCESS:
  252                 error->re_status = RPC_SUCCESS;
  253                 return;
  254         }
  255         /* NOTREACHED */
  256         /* something's wrong, but we don't know what ... */
  257         error->re_status = RPC_FAILED;
  258         error->re_lb.s1 = (int32_t)MSG_ACCEPTED;
  259         error->re_lb.s2 = (int32_t)acpt_stat;
  260 }
  261 
  262 static void 
  263 rejected(enum reject_stat rjct_stat, struct rpc_err *error)
  264 {
  265 
  266         assert(error != NULL);
  267 
  268         switch (rjct_stat) {
  269         case RPC_MISMATCH:
  270                 error->re_status = RPC_VERSMISMATCH;
  271                 return;
  272 
  273         case AUTH_ERROR:
  274                 error->re_status = RPC_AUTHERROR;
  275                 return;
  276         }
  277         /* something's wrong, but we don't know what ... */
  278         /* NOTREACHED */
  279         error->re_status = RPC_FAILED;
  280         error->re_lb.s1 = (int32_t)MSG_DENIED;
  281         error->re_lb.s2 = (int32_t)rjct_stat;
  282 }
  283 
  284 /*
  285  * given a reply message, fills in the error
  286  */
  287 void
  288 _seterr_reply(struct rpc_msg *msg, struct rpc_err *error)
  289 {
  290 
  291         assert(msg != NULL);
  292         assert(error != NULL);
  293 
  294         /* optimized for normal, SUCCESSful case */
  295         switch (msg->rm_reply.rp_stat) {
  296 
  297         case MSG_ACCEPTED:
  298                 if (msg->acpted_rply.ar_stat == SUCCESS) {
  299                         error->re_status = RPC_SUCCESS;
  300                         return;
  301                 }
  302                 accepted(msg->acpted_rply.ar_stat, error);
  303                 break;
  304 
  305         case MSG_DENIED:
  306                 rejected(msg->rjcted_rply.rj_stat, error);
  307                 break;
  308 
  309         default:
  310                 error->re_status = RPC_FAILED;
  311                 error->re_lb.s1 = (int32_t)(msg->rm_reply.rp_stat);
  312                 break;
  313         }
  314         switch (error->re_status) {
  315 
  316         case RPC_VERSMISMATCH:
  317                 error->re_vers.low = msg->rjcted_rply.rj_vers.low;
  318                 error->re_vers.high = msg->rjcted_rply.rj_vers.high;
  319                 break;
  320 
  321         case RPC_AUTHERROR:
  322                 error->re_why = msg->rjcted_rply.rj_why;
  323                 break;
  324 
  325         case RPC_PROGVERSMISMATCH:
  326                 error->re_vers.low = msg->acpted_rply.ar_vers.low;
  327                 error->re_vers.high = msg->acpted_rply.ar_vers.high;
  328                 break;
  329 
  330         case RPC_FAILED:
  331         case RPC_SUCCESS:
  332         case RPC_PROGNOTREGISTERED:
  333         case RPC_PMAPFAILURE:
  334         case RPC_UNKNOWNPROTO:
  335         case RPC_UNKNOWNHOST:
  336         case RPC_SYSTEMERROR:
  337         case RPC_CANTDECODEARGS:
  338         case RPC_PROCUNAVAIL:
  339         case RPC_PROGUNAVAIL:
  340         case RPC_TIMEDOUT:
  341         case RPC_CANTRECV:
  342         case RPC_CANTSEND:
  343         case RPC_CANTDECODERES:
  344         case RPC_CANTENCODEARGS:
  345         default:
  346                 break;
  347         }
  348 }

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