rpc_prot.c

   1 /* @(#)rpc_prot.c       2.3 88/08/07 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if 0
  31 static char sccsid[] = "@(#)rpc_prot.c 1.36 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * rpc_prot.c
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  *
  39  * This set of routines implements the rpc message definition,
  40  * its serializer and some common rpc utility routines.
  41  * The routines are meant for various implementations of rpc -
  42  * they are NOT for the rpc client or rpc service implementations!
  43  * Because authentication stuff is easy and is part of rpc, the opaque
  44  * routines are also in this program.
  45  */
  46
  47 #define __FORCE_GLIBC
  48 #include <features.h>
  49
  50 #include <sys/param.h>
  51
  52 #include <rpc/rpc.h>
  53
  54
  55 /* * * * * * * * * * * * * * XDR Authentication * * * * * * * * * * * */
  56
  57 /*
  58  * XDR an opaque authentication struct
  59  * (see auth.h)
  60  */
  61 bool_t
  62 xdr_opaque_auth (XDR *xdrs, struct opaque_auth *ap)
  63 {
  64
  65   if (xdr_enum (xdrs, &(ap->oa_flavor)))
  66     return xdr_bytes (xdrs, &ap->oa_base,
  67                       &ap->oa_length, MAX_AUTH_BYTES);
  68   return FALSE;
  69 }
  70 libc_hidden_def(xdr_opaque_auth)
  71
  72 /*
  73  * XDR a DES block
  74  */
  75 bool_t
  76 xdr_des_block (XDR *xdrs, des_block *blkp)
  77 {
  78   return xdr_opaque (xdrs, (caddr_t) blkp, sizeof (des_block));
  79 }
  80
  81 /* * * * * * * * * * * * * * XDR RPC MESSAGE * * * * * * * * * * * * * * * */
  82
  83 /*
  84  * XDR the MSG_ACCEPTED part of a reply message union
  85  */
  86 bool_t
  87 xdr_accepted_reply (XDR *xdrs, struct accepted_reply *ar)
  88 {
  89   /* personalized union, rather than calling xdr_union */
  90   if (!xdr_opaque_auth (xdrs, &(ar->ar_verf)))
  91     return FALSE;
  92   if (!xdr_enum (xdrs, (enum_t *) & (ar->ar_stat)))
  93     return FALSE;
  94   switch (ar->ar_stat)
  95     {
  96     case SUCCESS:
  97       return ((*(ar->ar_results.proc)) (xdrs, ar->ar_results.where));
  98     case PROG_MISMATCH:
  99       if (!xdr_u_long (xdrs, &(ar->ar_vers.low)))
 100         return FALSE;
 101       return (xdr_u_long (xdrs, &(ar->ar_vers.high)));
 102     default:
 103       return TRUE;
 104     }
 105   return TRUE;          /* TRUE => open ended set of problems */
 106 }
 107 libc_hidden_def(xdr_accepted_reply)
 108
 109 /*
 110  * XDR the MSG_DENIED part of a reply message union
 111  */
 112 bool_t
 113 xdr_rejected_reply (XDR *xdrs, struct rejected_reply *rr)
 114 {
 115   /* personalized union, rather than calling xdr_union */
 116   if (!xdr_enum (xdrs, (enum_t *) & (rr->rj_stat)))
 117     return FALSE;
 118   switch (rr->rj_stat)
 119     {
 120     case RPC_MISMATCH:
 121       if (!xdr_u_long (xdrs, &(rr->rj_vers.low)))
 122         return FALSE;
 123       return xdr_u_long (xdrs, &(rr->rj_vers.high));
 124
 125     case AUTH_ERROR:
 126       return xdr_enum (xdrs, (enum_t *) & (rr->rj_why));
 127     }
 128   return FALSE;
 129 }
 130 libc_hidden_def(xdr_rejected_reply)
 131
 132 static const struct xdr_discrim reply_dscrm[3] =
 133 {
 134   {(int) MSG_ACCEPTED, (xdrproc_t) xdr_accepted_reply},
 135   {(int) MSG_DENIED, (xdrproc_t) xdr_rejected_reply},
 136   {__dontcare__, NULL_xdrproc_t}};
 137
 138 /*
 139  * XDR a reply message
 140  */
 141 bool_t
 142 xdr_replymsg (XDR *xdrs, struct rpc_msg *rmsg)
 143 {
 144   if (xdr_u_long (xdrs, &(rmsg->rm_xid)) &&
 145       xdr_enum (xdrs, (enum_t *) & (rmsg->rm_direction)) &&
 146       (rmsg->rm_direction == REPLY))
 147     return xdr_union (xdrs, (enum_t *) & (rmsg->rm_reply.rp_stat),
 148                       (caddr_t) & (rmsg->rm_reply.ru), reply_dscrm,
 149                       NULL_xdrproc_t);
 150   return FALSE;
 151 }
 152 libc_hidden_def(xdr_replymsg)
 153
 154
 155 /*
 156  * Serializes the "static part" of a call message header.
 157  * The fields include: rm_xid, rm_direction, rpcvers, prog, and vers.
 158  * The rm_xid is not really static, but the user can easily munge on the fly.
 159  */
 160 bool_t
 161 xdr_callhdr (XDR *xdrs, struct rpc_msg *cmsg)
 162 {
 163
 164   cmsg->rm_direction = CALL;
 165   cmsg->rm_call.cb_rpcvers = RPC_MSG_VERSION;
 166   if (
 167        (xdrs->x_op == XDR_ENCODE) &&
 168        xdr_u_long (xdrs, &(cmsg->rm_xid)) &&
 169        xdr_enum (xdrs, (enum_t *) & (cmsg->rm_direction)) &&
 170        xdr_u_long (xdrs, &(cmsg->rm_call.cb_rpcvers)) &&
 171        xdr_u_long (xdrs, &(cmsg->rm_call.cb_prog)))
 172     return xdr_u_long (xdrs, &(cmsg->rm_call.cb_vers));
 173   return FALSE;
 174 }
 175 libc_hidden_def(xdr_callhdr)
 176
 177 /* ************************** Client utility routine ************* */
 178
 179 static void
 180 accepted (enum accept_stat acpt_stat,
 181           struct rpc_err *error)
 182 {
 183   switch (acpt_stat)
 184     {
 185
 186     case PROG_UNAVAIL:
 187       error->re_status = RPC_PROGUNAVAIL;
 188       return;
 189
 190     case PROG_MISMATCH:
 191       error->re_status = RPC_PROGVERSMISMATCH;
 192       return;
 193
 194     case PROC_UNAVAIL:
 195       error->re_status = RPC_PROCUNAVAIL;
 196       return;
 197
 198     case GARBAGE_ARGS:
 199       error->re_status = RPC_CANTDECODEARGS;
 200       return;
 201
 202     case SYSTEM_ERR:
 203       error->re_status = RPC_SYSTEMERROR;
 204       return;
 205
 206     case SUCCESS:
 207       error->re_status = RPC_SUCCESS;
 208       return;
 209     }
 210   /* something's wrong, but we don't know what ... */
 211   error->re_status = RPC_FAILED;
 212   error->re_lb.s1 = (long) MSG_ACCEPTED;
 213   error->re_lb.s2 = (long) acpt_stat;
 214 }
 215
 216 static void
 217 rejected (enum reject_stat rjct_stat,
 218           struct rpc_err *error)
 219 {
 220   switch (rjct_stat)
 221     {
 222     case RPC_MISMATCH:
 223       error->re_status = RPC_VERSMISMATCH;
 224       return;
 225     case AUTH_ERROR:
 226       error->re_status = RPC_AUTHERROR;
 227       return;
 228     default:
 229       /* something's wrong, but we don't know what ... */
 230       error->re_status = RPC_FAILED;
 231       error->re_lb.s1 = (long) MSG_DENIED;
 232       error->re_lb.s2 = (long) rjct_stat;
 233       return;
 234     }
 235 }
 236
 237 /*
 238  * given a reply message, fills in the error
 239  */
 240 void
 241 _seterr_reply (struct rpc_msg *msg,
 242                struct rpc_err *error)
 243 {
 244   /* optimized for normal, SUCCESSful case */
 245   switch (msg->rm_reply.rp_stat)
 246     {
 247     case MSG_ACCEPTED:
 248       if (msg->acpted_rply.ar_stat == SUCCESS)
 249         {
 250           error->re_status = RPC_SUCCESS;
 251           return;
 252         };
 253       accepted (msg->acpted_rply.ar_stat, error);
 254       break;
 255
 256     case MSG_DENIED:
 257       rejected (msg->rjcted_rply.rj_stat, error);
 258       break;
 259
 260     default:
 261       error->re_status = RPC_FAILED;
 262       error->re_lb.s1 = (long) (msg->rm_reply.rp_stat);
 263       break;
 264     }
 265   switch (error->re_status)
 266     {
 267
 268     case RPC_VERSMISMATCH:
 269       error->re_vers.low = msg->rjcted_rply.rj_vers.low;
 270       error->re_vers.high = msg->rjcted_rply.rj_vers.high;
 271       break;
 272
 273     case RPC_AUTHERROR:
 274       error->re_why = msg->rjcted_rply.rj_why;
 275       break;
 276
 277     case RPC_PROGVERSMISMATCH:
 278       error->re_vers.low = msg->acpted_rply.ar_vers.low;
 279       error->re_vers.high = msg->acpted_rply.ar_vers.high;
 280       break;
 281     default:
 282       break;
 283     }
 284 }
 285 libc_hidden_def(_seterr_reply)