LCOV - code coverage report
Current view: top level - src/test/fuzz - asmap.cpp (source / functions) Hit Total Coverage
Test: fuzz_coverage.info Lines: 5 30 16.7 %
Date: 2023-10-05 12:38:51 Functions: 5 6 83.3 %
Branches: 3 46 6.5 %

           Branch data     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 <netgroup.h>
       7                 :            : #include <test/fuzz/fuzz.h>
       8                 :            : #include <util/asmap.h>
       9                 :            : 
      10                 :            : #include <cstdint>
      11                 :            : #include <vector>
      12                 :            : 
      13                 :            : //! asmap code that consumes nothing
      14                 :          2 : static const std::vector<bool> IPV6_PREFIX_ASMAP = {};
      15                 :            : 
      16                 :            : //! asmap code that consumes the 96 prefix bits of ::ffff:0/96 (IPv4-in-IPv6 map)
      17         [ +  - ]:          2 : static const std::vector<bool> IPV4_PREFIX_ASMAP = {
      18                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      19                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      20                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      21                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      22                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      23                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      24                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      25         [ +  - ]:          2 :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      26                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      27                 :            :     true, true, false, true, true, true, true, true, true, true, false, false, false, false, false, false, false, false, // Match 0x00
      28                 :            :     true, true, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true,         // Match 0xFF
      29                 :            :     true, true, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true          // Match 0xFF
      30                 :            : };
      31                 :            : 
      32         [ -  + ]:          4 : FUZZ_TARGET(asmap)
      33                 :            : {
      34                 :            :     // Encoding: [7 bits: asmap size] [1 bit: ipv6?] [3-130 bytes: asmap] [4 or 16 bytes: addr]
      35         [ #  # ]:          0 :     if (buffer.size() < 1 + 3 + 4) return;
      36                 :          0 :     int asmap_size = 3 + (buffer[0] & 127);
      37                 :          0 :     bool ipv6 = buffer[0] & 128;
      38                 :          0 :     const size_t addr_size = ipv6 ? ADDR_IPV6_SIZE : ADDR_IPV4_SIZE;
      39         [ #  # ]:          0 :     if (buffer.size() < size_t(1 + asmap_size + addr_size)) return;
      40         [ #  # ]:          0 :     std::vector<bool> asmap = ipv6 ? IPV6_PREFIX_ASMAP : IPV4_PREFIX_ASMAP;
      41         [ #  # ]:          0 :     asmap.reserve(asmap.size() + 8 * asmap_size);
      42         [ #  # ]:          0 :     for (int i = 0; i < asmap_size; ++i) {
      43         [ #  # ]:          0 :         for (int j = 0; j < 8; ++j) {
      44         [ #  # ]:          0 :             asmap.push_back((buffer[1 + i] >> j) & 1);
      45                 :          0 :         }
      46                 :          0 :     }
      47   [ #  #  #  # ]:          0 :     if (!SanityCheckASMap(asmap, 128)) return;
      48                 :            : 
      49                 :          0 :     const uint8_t* addr_data = buffer.data() + 1 + asmap_size;
      50         [ #  # ]:          0 :     CNetAddr net_addr;
      51         [ #  # ]:          0 :     if (ipv6) {
      52         [ #  # ]:          0 :         assert(addr_size == ADDR_IPV6_SIZE);
      53         [ #  # ]:          0 :         net_addr.SetLegacyIPv6({addr_data, addr_size});
      54                 :          0 :     } else {
      55         [ #  # ]:          0 :         assert(addr_size == ADDR_IPV4_SIZE);
      56                 :            :         in_addr ipv4;
      57                 :          0 :         memcpy(&ipv4, addr_data, addr_size);
      58   [ #  #  #  # ]:          0 :         net_addr.SetIP(CNetAddr{ipv4});
      59                 :            :     }
      60   [ #  #  #  # ]:          0 :     NetGroupManager netgroupman{asmap};
      61         [ #  # ]:          0 :     (void)netgroupman.GetMappedAS(net_addr);
      62         [ #  # ]:          0 : }

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