service_runtime/nrd_xfer_lib/nrd_xfer_effector.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NRD xfer effector for trusted code use.
  34  */
  35
  36 #include "native_client/include/nacl_base.h"
  37
  38 #include "native_client/service_runtime/nacl_desc_base.h"
  39 #include "native_client/service_runtime/nacl_desc_effector.h"
  40 #include "native_client/service_runtime/nacl_log.h"
  41 #include "native_client/service_runtime/nrd_xfer_lib/nrd_xfer_effector.h"
  42
  43 /* fwd */
  44 static struct NaClDescEffectorVtbl NaClNrdXferEffectorVtbl;
  45
  46 int NaClNrdXferEffectorCtor(struct NaClNrdXferEffector  *self,
  47                             struct NaClDesc             *src_desc)
  48 {
  49   self->src_desc = src_desc;
  50   NaClDescRef(src_desc);
  51   self->out_desc = NULL;
  52
  53   self->base.vtbl = &NaClNrdXferEffectorVtbl;
  54   return 1;
  55 }
  56
  57 static void NaClNrdXferEffectorDtor(struct NaClDescEffector *vself)
  58 {
  59   struct NaClNrdXferEffector *self = (struct NaClNrdXferEffector *) vself;
  60
  61   NaClDescUnref(self->src_desc);
  62   self->src_desc = NULL;
  63   if (NULL != self->out_desc) {
  64     NaClLog(LOG_WARNING,
  65             ("NaClNrdXferEffectorDtor: called with out_desc non-NULL,"
  66              " unref'ing\n"));
  67     NaClDescUnref(self->out_desc);
  68     self->out_desc = NULL;
  69   }
  70   return;
  71 }
  72
  73 struct NaClDesc *NaClNrdXferEffectorTakeDesc(struct NaClNrdXferEffector *self)
  74 {
  75   struct NaClDesc *ndp = self->out_desc;
  76   self->out_desc = NULL;
  77   return ndp;
  78 }
  79
  80 static int NaClNrdXferEffectorReturnCreatedDesc(struct NaClDescEffector *vself,
  81                                                 struct NaClDesc         *ndp)
  82 {
  83   struct NaClNrdXferEffector *self = (struct NaClNrdXferEffector *) vself;
  84   if (NULL != self->out_desc) {
  85     NaClLog(LOG_WARNING,
  86             ("NaClNrdXferEffectorReturnCreatedDesc: "
  87              " got new return descriptor at 0x%08"PRIxPTR", but"
  88              " previously returned one at 0x%08"PRIxPTR" not retrieved"
  89              " (unref'ing)\n"),
  90             (uintptr_t) ndp,
  91             (uintptr_t) self->out_desc);
  92     NaClDescUnref(self->out_desc);
  93   }
  94   if (NULL == ndp) {
  95     NaClLog(LOG_WARNING,
  96             "NaClNrdXferEffectorReturnCreatedDesc: "
  97             " called with NULL returned NaClDesc object\n");
  98   }
  99   self->out_desc = ndp;
 100   return 0;
 101 }
 102
 103 static void NaClNrdXferEffectorUpdateAddrMap(struct NaClDescEffector  *vself,
 104                                              uintptr_t                sysaddr,
 105                                              size_t                   nbytes,
 106                                              int                      sysprot,
 107                                              struct NaClDesc          *bkobj,
 108                                              size_t                   bksize,
 109                                              off_t                    offbytes,
 110                                              int                      del_mem)
 111 {
 112   /* No records are kept */
 113   return;
 114 }
 115
 116 static int NaClNrdXferEffectorUnmapMemory(struct NaClDescEffector *vself,
 117                                           uintptr_t               sysaddr,
 118                                           size_t                  nbytes)
 119 {
 120   return 0;
 121 }
 122
 123 static int NaClNrdXferEffectorMapAnonymousMemory(
 124     struct NaClDescEffector *vself,
 125     uintptr_t               sysaddr,
 126     size_t                  nbytes,
 127     int                     prot)
 128 {
 129   return 0;
 130 }
 131
 132 static struct NaClDescImcBoundDesc *NaClNrdXferEffectorSourceSock(
 133     struct NaClDescEffector *vself)
 134 {
 135   struct NaClNrdXferEffector *self = (struct NaClNrdXferEffector *) vself;
 136
 137   return (struct NaClDescImcBoundDesc *) self->src_desc;
 138   /* does not inc refcount */
 139 }
 140
 141 static struct NaClDescEffectorVtbl NaClNrdXferEffectorVtbl = {
 142   NaClNrdXferEffectorDtor,
 143   NaClNrdXferEffectorReturnCreatedDesc,
 144   NaClNrdXferEffectorUpdateAddrMap,
 145   NaClNrdXferEffectorUnmapMemory,
 146   NaClNrdXferEffectorMapAnonymousMemory,
 147   NaClNrdXferEffectorSourceSock,
 148 };