net/spdy/fuzzing/hpack_example_generator.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 "base/at_exit.h"
   6 #include "base/command_line.h"
   7 #include "base/files/file.h"
   8 #include "base/files/file_util.h"
   9 #include "base/strings/string_number_conversions.h"
  10 #include "net/spdy/fuzzing/hpack_fuzz_util.h"
  11 #include "net/spdy/hpack/hpack_constants.h"
  12 #include "net/spdy/hpack/hpack_encoder.h"
  13 #include "net/spdy/spdy_protocol.h"
  14
  15 namespace {
  16
  17 // Target file for generated HPACK header sets.
  18 const char kFileToWrite[] = "file-to-write";
  19
  20 // Number of header sets to generate.
  21 const char kExampleCount[] = "example-count";
  22
  23 }  // namespace
  24
  25 using net::HpackFuzzUtil;
  26 using std::map;
  27 using std::string;
  28
  29 // Generates a configurable number of header sets (using HpackFuzzUtil), and
  30 // sequentially encodes each header set with an HpackEncoder. Encoded header
  31 // sets are written to the output file in length-prefixed blocks.
  32 int main(int argc, char** argv) {
  33   base::AtExitManager exit_manager;
  34
  35   base::CommandLine::Init(argc, argv);
  36   const base::CommandLine& command_line =
  37       *base::CommandLine::ForCurrentProcess();
  38
  39   if (!command_line.HasSwitch(kFileToWrite) ||
  40       !command_line.HasSwitch(kExampleCount)) {
  41     LOG(ERROR) << "Usage: " << argv[0]
  42                << " --" << kFileToWrite << "=/path/to/file.out"
  43                << " --" << kExampleCount << "=1000";
  44     return -1;
  45   }
  46   string file_to_write = command_line.GetSwitchValueASCII(kFileToWrite);
  47
  48   int example_count = 0;
  49   base::StringToInt(command_line.GetSwitchValueASCII(kExampleCount),
  50                     &example_count);
  51
  52   DVLOG(1) << "Writing output to " << file_to_write;
  53   base::File file_out(base::FilePath::FromUTF8Unsafe(file_to_write),
  54                       base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE);
  55   CHECK(file_out.IsValid()) << file_out.error_details();
  56
  57   HpackFuzzUtil::GeneratorContext context;
  58   HpackFuzzUtil::InitializeGeneratorContext(&context);
  59   net::HpackEncoder encoder(net::ObtainHpackHuffmanTable());
  60
  61   for (int i = 0; i != example_count; ++i) {
  62     net::SpdyHeaderBlock headers =
  63         HpackFuzzUtil::NextGeneratedHeaderSet(&context);
  64
  65     string buffer;
  66     CHECK(encoder.EncodeHeaderSet(headers, &buffer));
  67
  68     string prefix = HpackFuzzUtil::HeaderBlockPrefix(buffer.size());
  69
  70     CHECK_LT(0, file_out.WriteAtCurrentPos(prefix.data(), prefix.size()));
  71     CHECK_LT(0, file_out.WriteAtCurrentPos(buffer.data(), buffer.size()));
  72   }
  73   CHECK(file_out.Flush());
  74   DVLOG(1) << "Generated " << example_count << " blocks.";
  75   return 0;
  76 }