Line data    Source code

       1             : // Copyright (c) 2020-2021 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #include <netaddress.h>
       6             : #include <util/asmap.h>
       7             : #include <test/fuzz/fuzz.h>
       8             : 
       9             : #include <cstdint>
      10             : #include <optional>
      11             : #include <vector>
      12             : 
      13             : #include <assert.h>
      14             : 
      15           4 : FUZZ_TARGET(asmap_direct)
      16             : {
      17             :     // Encoding: [asmap using 1 bit / byte] 0xFF [addr using 1 bit / byte]
      18           0 :     std::optional<size_t> sep_pos_opt;
      19           0 :     for (size_t pos = 0; pos < buffer.size(); ++pos) {
      20           0 :         uint8_t x = buffer[pos];
      21           0 :         if ((x & 0xFE) == 0) continue;
      22           0 :         if (x == 0xFF) {
      23           0 :             if (sep_pos_opt) return;
      24           0 :             sep_pos_opt = pos;
      25           2 :         } else {
      26           0 :             return;
      27             :         }
      28           0 :     }
      29           0 :     if (!sep_pos_opt) return; // Needs exactly 1 separator
      30           0 :     const size_t sep_pos{sep_pos_opt.value()};
      31           0 :     if (buffer.size() - sep_pos - 1 > 128) return; // At most 128 bits in IP address
      32             : 
      33             :     // Checks on asmap
      34           0 :     std::vector<bool> asmap(buffer.begin(), buffer.begin() + sep_pos);
      35           0 :     if (SanityCheckASMap(asmap, buffer.size() - 1 - sep_pos)) {
      36             :         // Verify that for valid asmaps, no prefix (except up to 7 zero padding bits) is valid.
      37           0 :         std::vector<bool> asmap_prefix = asmap;
      38           0 :         while (!asmap_prefix.empty() && asmap_prefix.size() + 7 > asmap.size() && asmap_prefix.back() == false) {
      39           0 :             asmap_prefix.pop_back();
      40             :         }
      41           0 :         while (!asmap_prefix.empty()) {
      42           0 :             asmap_prefix.pop_back();
      43           0 :             assert(!SanityCheckASMap(asmap_prefix, buffer.size() - 1 - sep_pos));
      44             :         }
      45             :         // No address input should trigger assertions in interpreter
      46           0 :         std::vector<bool> addr(buffer.begin() + sep_pos + 1, buffer.end());
      47           0 :         (void)Interpret(asmap, addr);
      48           0 :     }
      49           0 : }