sandbox/mac/os_compatibility.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "sandbox/mac/os_compatibility.h"
   6
   7 #include <servers/bootstrap.h>
   8 #include <unistd.h>
   9
  10 #include "base/mac/mac_util.h"
  11
  12 namespace sandbox {
  13
  14 namespace {
  15
  16 // Verified from launchd-329.3.3 (10.6.8).
  17 struct look_up2_request_10_6 {
  18   mach_msg_header_t Head;
  19   NDR_record_t NDR;
  20   name_t servicename;
  21   pid_t targetpid;
  22   uint64_t flags;
  23 };
  24
  25 struct look_up2_reply_10_6 {
  26   mach_msg_header_t Head;
  27   mach_msg_body_t msgh_body;
  28   mach_msg_port_descriptor_t service_port;
  29 };
  30
  31 // Verified from:
  32 //   launchd-392.39 (10.7.5)
  33 //   launchd-442.26.2 (10.8.5)
  34 //   launchd-842.1.4 (10.9.0)
  35 struct look_up2_request_10_7 {
  36   mach_msg_header_t Head;
  37   NDR_record_t NDR;
  38   name_t servicename;
  39   pid_t targetpid;
  40   uuid_t instanceid;
  41   uint64_t flags;
  42 };
  43
  44 // look_up2_reply_10_7 is the same as the 10_6 version.
  45
  46 // Verified from:
  47 //   launchd-329.3.3 (10.6.8)
  48 //   launchd-392.39 (10.7.5)
  49 //   launchd-442.26.2 (10.8.5)
  50 //   launchd-842.1.4 (10.9.0)
  51 typedef int vproc_gsk_t;  // Defined as an enum in liblaunch/vproc_priv.h.
  52 struct swap_integer_request_10_6 {
  53   mach_msg_header_t Head;
  54   NDR_record_t NDR;
  55   vproc_gsk_t inkey;
  56   vproc_gsk_t outkey;
  57   int64_t inval;
  58 };
  59
  60 // TODO(rsesek): Libc provides strnlen() starting in 10.7.
  61 size_t strnlen(const char* str, size_t maxlen) {
  62   size_t len = 0;
  63   for (; len < maxlen; ++len, ++str) {
  64     if (*str == '\0')
  65       break;
  66   }
  67   return len;
  68 }
  69
  70 template <typename R>
  71 std::string LaunchdLookUp2GetRequestName(const mach_msg_header_t* header) {
  72   DCHECK_EQ(sizeof(R), header->msgh_size);
  73   const R* request = reinterpret_cast<const R*>(header);
  74   // Make sure the name is properly NUL-terminated.
  75   const size_t name_length =
  76       strnlen(request->servicename, BOOTSTRAP_MAX_NAME_LEN);
  77   std::string name = std::string(request->servicename, name_length);
  78   return name;
  79 }
  80
  81 template <typename R>
  82 void LaunchdLookUp2FillReply(mach_msg_header_t* header, mach_port_t port) {
  83   R* reply = reinterpret_cast<R*>(header);
  84   reply->Head.msgh_size = sizeof(R);
  85   reply->Head.msgh_bits =
  86       MACH_MSGH_BITS_REMOTE(MACH_MSG_TYPE_MOVE_SEND_ONCE) |
  87       MACH_MSGH_BITS_COMPLEX;
  88   reply->msgh_body.msgh_descriptor_count = 1;
  89   reply->service_port.name = port;
  90   reply->service_port.disposition = MACH_MSG_TYPE_COPY_SEND;
  91   reply->service_port.type = MACH_MSG_PORT_DESCRIPTOR;
  92 }
  93
  94 template <typename R>
  95 bool LaunchdSwapIntegerIsGetOnly(const mach_msg_header_t* header) {
  96   const R* request = reinterpret_cast<const R*>(header);
  97   return request->inkey == 0 && request->inval == 0 && request->outkey != 0;
  98 }
  99
 100 }  // namespace
 101
 102 const LaunchdCompatibilityShim GetLaunchdCompatibilityShim() {
 103   LaunchdCompatibilityShim shim = {
 104     .msg_id_look_up2 = 404,
 105     .msg_id_swap_integer = 416,
 106     .look_up2_fill_reply = &LaunchdLookUp2FillReply<look_up2_reply_10_6>,
 107     .swap_integer_is_get_only =
 108         &LaunchdSwapIntegerIsGetOnly<swap_integer_request_10_6>,
 109   };
 110
 111   if (base::mac::IsOSSnowLeopard()) {
 112     shim.look_up2_get_request_name =
 113         &LaunchdLookUp2GetRequestName<look_up2_request_10_6>;
 114   } else if (base::mac::IsOSLionOrLater() &&
 115              !base::mac::IsOSLaterThanMavericks_DontCallThis()) {
 116     shim.look_up2_get_request_name =
 117         &LaunchdLookUp2GetRequestName<look_up2_request_10_7>;
 118   } else {
 119     DLOG(ERROR) << "Unknown OS, using launchd compatibility shim from 10.7.";
 120     shim.look_up2_get_request_name =
 121         &LaunchdLookUp2GetRequestName<look_up2_request_10_7>;
 122   }
 123
 124   return shim;
 125 }
 126
 127 }  // namespace sandbox