external/bsd/am-utils/dist/libamu/misc_rpc.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1997-2009 Erez Zadok
   5  * Copyright (c) 1990 Jan-Simon Pendry
   6  * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
   7  * Copyright (c) 1990 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to Berkeley by
  11  * Jan-Simon Pendry at Imperial College, London.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgment:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  *
  42  * File: am-utils/libamu/misc_rpc.c
  43  *
  44  */
  45
  46 /*
  47  * Additions to Sun RPC.
  48  */
  49
  50 #ifdef HAVE_CONFIG_H
  51 # include <config.h>
  52 #endif /* HAVE_CONFIG_H */
  53 #include <am_defs.h>
  54 #include <amu.h>
  55
  56 /*
  57  * Some systems renamed _seterr_reply to __seterr_reply (with two
  58  * leading underscores)
  59  */
  60 #if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
  61 # define _seterr_reply  __seterr_reply
  62 #endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
  63
  64
  65 void
  66 rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
  67 {
  68   /*
  69    * Initialize the message
  70    */
  71   memset((voidp) mp, 0, sizeof(*mp));
  72   mp->rm_xid = 0;
  73   mp->rm_direction = CALL;
  74   mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
  75   mp->rm_call.cb_prog = prog;
  76   mp->rm_call.cb_vers = vers;
  77   mp->rm_call.cb_proc = proc;
  78 }
  79
  80
  81 /*
  82  * Field reply to call to mountd
  83  */
  84 int
  85 pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
  86 {
  87   XDR reply_xdr;
  88   int ok;
  89   struct rpc_err err;
  90   struct rpc_msg reply_msg;
  91   int error = 0;
  92
  93   /* memset((voidp) &err, 0, sizeof(err)); */
  94   memset((voidp) &reply_msg, 0, sizeof(reply_msg));
  95   memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
  96
  97   reply_msg.acpted_rply.ar_results.where = where;
  98   reply_msg.acpted_rply.ar_results.proc = where_xdr;
  99
 100   xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
 101
 102   ok = xdr_replymsg(&reply_xdr, &reply_msg);
 103   if (!ok) {
 104     error = EIO;
 105     goto drop;
 106   }
 107   _seterr_reply(&reply_msg, &err);
 108   if (err.re_status != RPC_SUCCESS) {
 109     error = EIO;
 110     goto drop;
 111   }
 112
 113 drop:
 114   if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
 115       reply_msg.acpted_rply.ar_verf.oa_base) {
 116     reply_xdr.x_op = XDR_FREE;
 117     (void) xdr_opaque_auth(&reply_xdr,
 118                            &reply_msg.acpted_rply.ar_verf);
 119   }
 120   xdr_destroy(&reply_xdr);
 121
 122   return error;
 123 }
 124
 125
 126 int
 127 make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
 128 {
 129   XDR msg_xdr;
 130   int len;
 131   /*
 132    * Never cast pointers between different integer types, it breaks badly
 133    * on big-endian platforms if those types have different sizes.
 134    *
 135    * Cast to a local variable instead, and use that variable's address.
 136    */
 137   enum_t local_proc = (enum_t) proc;
 138
 139   xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
 140
 141   /*
 142    * Basic protocol header
 143    */
 144   if (!xdr_callhdr(&msg_xdr, mp))
 145     return -EIO;
 146
 147   /*
 148    * Called procedure number
 149    */
 150   if (!xdr_enum(&msg_xdr, &local_proc))
 151     return -EIO;
 152
 153   /*
 154    * Authorization
 155    */
 156   if (!AUTH_MARSHALL(auth, &msg_xdr))
 157     return -EIO;
 158
 159   /*
 160    * Arguments
 161    */
 162   if (!(*arg_xdr) (&msg_xdr, arg))
 163     return -EIO;
 164
 165   /*
 166    * Determine length
 167    */
 168   len = xdr_getpos(&msg_xdr);
 169
 170   /*
 171    * Throw away xdr
 172    */
 173   xdr_destroy(&msg_xdr);
 174
 175   return len;
 176 }
 177
 178
 179 /* get uid/gid from RPC credentials */
 180 int
 181 getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
 182 {
 183   struct authunix_parms *aup = (struct authunix_parms *) NULL;
 184 #ifdef HAVE_RPC_AUTH_DES_H
 185   struct authdes_cred *adp;
 186 #endif /* HAVE_RPC_AUTH_DES_H */
 187
 188   switch (rp->rq_cred.oa_flavor) {
 189
 190   case AUTH_UNIX:
 191     aup = (struct authunix_parms *) rp->rq_clntcred;
 192     *u = aup->aup_uid;
 193     *g = aup->aup_gid;
 194     break;
 195
 196 #ifdef HAVE_RPC_AUTH_DES_H
 197   case AUTH_DES:
 198     adp = (struct authdes_cred *) rp->rq_clntcred;
 199     *g = INVALIDID;             /* some unknown group id */
 200     if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
 201         break;
 202     /* fall through */
 203 #endif /* HAVE_RPC_AUTH_DES_H */
 204
 205   default:
 206     *u = *g = INVALIDID;        /* just in case */
 207     svcerr_weakauth(nfsxprt);
 208     return -1;
 209   }
 210
 211   return 0;                     /* everything is ok */
 212 }