content/common/child_process_sandbox_support_impl_linux.cc

   1 // Copyright (c) 2012 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 "content/common/child_process_sandbox_support_impl_linux.h"
   6
   7 #include <sys/stat.h>
   8
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/pickle.h"
  11 #include "base/posix/eintr_wrapper.h"
  12 #include "base/posix/unix_domain_socket.h"
  13 #include "content/common/sandbox_linux.h"
  14 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/linux/WebFontFamily.h"
  15 #include "third_party/WebKit/Source/WebKit/chromium/public/linux/WebFontRenderStyle.h"
  16
  17 namespace content {
  18
  19 void GetFontFamilyForCharacters(const uint16_t* utf16,
  20                                 size_t num_utf16,
  21                                 const char* preferred_locale,
  22                                 WebKit::WebFontFamily* family) {
  23   Pickle request;
  24   request.WriteInt(LinuxSandbox::METHOD_GET_FONT_FAMILY_FOR_CHARS);
  25   request.WriteInt(num_utf16);
  26   for (size_t i = 0; i < num_utf16; ++i)
  27     request.WriteUInt32(utf16[i]);
  28   request.WriteString(preferred_locale);
  29
  30   uint8_t buf[512];
  31   const ssize_t n = UnixDomainSocket::SendRecvMsg(GetSandboxFD(), buf,
  32                                                   sizeof(buf), NULL, request);
  33
  34   std::string family_name;
  35   bool isBold = false;
  36   bool isItalic = false;
  37   if (n != -1) {
  38     Pickle reply(reinterpret_cast<char*>(buf), n);
  39     PickleIterator pickle_iter(reply);
  40     if (reply.ReadString(&pickle_iter, &family_name) &&
  41         reply.ReadBool(&pickle_iter, &isBold) &&
  42         reply.ReadBool(&pickle_iter, &isItalic)) {
  43       family->name = family_name;
  44       family->isBold = isBold;
  45       family->isItalic = isItalic;
  46     }
  47   }
  48 }
  49
  50 void GetRenderStyleForStrike(const char* family, int sizeAndStyle,
  51                              WebKit::WebFontRenderStyle* out) {
  52   Pickle request;
  53   request.WriteInt(LinuxSandbox::METHOD_GET_STYLE_FOR_STRIKE);
  54   request.WriteString(family);
  55   request.WriteInt(sizeAndStyle);
  56
  57   uint8_t buf[512];
  58   const ssize_t n = UnixDomainSocket::SendRecvMsg(GetSandboxFD(), buf,
  59                                                   sizeof(buf), NULL, request);
  60
  61   out->setDefaults();
  62   if (n == -1) {
  63     return;
  64   }
  65
  66   Pickle reply(reinterpret_cast<char*>(buf), n);
  67   PickleIterator pickle_iter(reply);
  68   int useBitmaps, useAutoHint, useHinting, hintStyle, useAntiAlias;
  69   int useSubpixelRendering, useSubpixelPositioning;
  70   if (reply.ReadInt(&pickle_iter, &useBitmaps) &&
  71       reply.ReadInt(&pickle_iter, &useAutoHint) &&
  72       reply.ReadInt(&pickle_iter, &useHinting) &&
  73       reply.ReadInt(&pickle_iter, &hintStyle) &&
  74       reply.ReadInt(&pickle_iter, &useAntiAlias) &&
  75       reply.ReadInt(&pickle_iter, &useSubpixelRendering) &&
  76       reply.ReadInt(&pickle_iter, &useSubpixelPositioning)) {
  77     out->useBitmaps = useBitmaps;
  78     out->useAutoHint = useAutoHint;
  79     out->useHinting = useHinting;
  80     out->hintStyle = hintStyle;
  81     out->useAntiAlias = useAntiAlias;
  82     out->useSubpixelRendering = useSubpixelRendering;
  83     out->useSubpixelPositioning = useSubpixelPositioning;
  84   }
  85 }
  86
  87 int MatchFontWithFallback(const std::string& face, bool bold,
  88                           bool italic, int charset) {
  89   Pickle request;
  90   request.WriteInt(LinuxSandbox::METHOD_MATCH_WITH_FALLBACK);
  91   request.WriteString(face);
  92   request.WriteBool(bold);
  93   request.WriteBool(italic);
  94   request.WriteUInt32(charset);
  95   uint8_t reply_buf[64];
  96   int fd = -1;
  97   UnixDomainSocket::SendRecvMsg(GetSandboxFD(), reply_buf, sizeof(reply_buf),
  98                                 &fd, request);
  99   return fd;
 100 }
 101
 102 bool GetFontTable(int fd, uint32_t table, uint8_t* output,
 103                   size_t* output_length) {
 104   if (table == 0) {
 105     struct stat st;
 106     if (fstat(fd, &st) < 0)
 107       return false;
 108     size_t length = st.st_size;
 109     if (!output) {
 110       *output_length = length;
 111       return true;
 112     }
 113     if (*output_length < length)
 114       return false;
 115     *output_length = length;
 116     ssize_t n = HANDLE_EINTR(pread(fd, output, length, 0));
 117     if (n != static_cast<ssize_t>(length))
 118       return false;
 119     return true;
 120   }
 121
 122   unsigned num_tables;
 123   uint8_t num_tables_buf[2];
 124
 125   ssize_t n = HANDLE_EINTR(pread(fd, &num_tables_buf, sizeof(num_tables_buf),
 126                            4 /* skip the font type */));
 127   if (n != sizeof(num_tables_buf))
 128     return false;
 129
 130   num_tables = static_cast<unsigned>(num_tables_buf[0]) << 8 |
 131                num_tables_buf[1];
 132
 133   // The size in bytes of an entry in the table directory.
 134   static const unsigned kTableEntrySize = 16;
 135   scoped_array<uint8_t> table_entries(
 136       new uint8_t[num_tables * kTableEntrySize]);
 137   n = HANDLE_EINTR(pread(fd, table_entries.get(), num_tables * kTableEntrySize,
 138                          12 /* skip the SFNT header */));
 139   if (n != static_cast<ssize_t>(num_tables * kTableEntrySize))
 140     return false;
 141
 142   size_t offset;
 143   size_t length = 0;
 144   for (unsigned i = 0; i < num_tables; i++) {
 145     const uint8_t* entry = table_entries.get() + i * kTableEntrySize;
 146     if (memcmp(entry, &table, sizeof(table)) == 0) {
 147       offset = static_cast<size_t>(entry[8]) << 24 |
 148                static_cast<size_t>(entry[9]) << 16 |
 149                static_cast<size_t>(entry[10]) << 8  |
 150                static_cast<size_t>(entry[11]);
 151       length = static_cast<size_t>(entry[12]) << 24 |
 152                static_cast<size_t>(entry[13]) << 16 |
 153                static_cast<size_t>(entry[14]) << 8  |
 154                static_cast<size_t>(entry[15]);
 155
 156       break;
 157     }
 158   }
 159
 160   if (!length)
 161     return false;
 162
 163   if (!output) {
 164     *output_length = length;
 165     return true;
 166   }
 167
 168   if (*output_length < length)
 169     return false;
 170
 171   *output_length = length;
 172   n = HANDLE_EINTR(pread(fd, output, length, offset));
 173   if (n != static_cast<ssize_t>(length))
 174     return false;
 175
 176   return true;
 177 }
 178
 179 }  // namespace content