LCOV - code coverage report
Current view: top level - dns/rdata/generic/detail - nsec_bitmap.cc (source / functions) Hit Total Coverage
Test: report.info Lines: 64 64 100.0 %
Date: 2012-05-15 Functions: 3 3 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 72 104 69.2 %

           Branch data     Line data    Source code
       1                 :            : // Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
       2                 :            : //
       3                 :            : // Permission to use, copy, modify, and/or distribute this software for any
       4                 :            : // purpose with or without fee is hereby granted, provided that the above
       5                 :            : // copyright notice and this permission notice appear in all copies.
       6                 :            : //
       7                 :            : // THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
       8                 :            : // REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
       9                 :            : // AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
      10                 :            : // INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
      11                 :            : // LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
      12                 :            : // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
      13                 :            : // PERFORMANCE OF THIS SOFTWARE.
      14                 :            : 
      15                 :            : #include <exceptions/exceptions.h>
      16                 :            : 
      17                 :            : #include <dns/exceptions.h>
      18                 :            : #include <dns/rdata.h>
      19                 :            : #include <dns/rrtype.h>
      20                 :            : 
      21                 :            : #include <cassert>
      22                 :            : #include <sstream>
      23                 :            : #include <vector>
      24                 :            : #include <cstring>
      25                 :            : #include <stdint.h>
      26                 :            : 
      27                 :            : using namespace std;
      28                 :            : 
      29                 :            : namespace isc {
      30                 :            : namespace dns {
      31                 :            : namespace rdata {
      32                 :            : namespace generic {
      33                 :            : namespace detail {
      34                 :            : namespace nsec {
      35                 :            : void
      36                 :         23 : checkRRTypeBitmaps(const char* const rrtype_name,
      37                 :            :                    const vector<uint8_t>& typebits)
      38                 :            : {
      39                 :         23 :     bool first = true;
      40                 :         23 :     unsigned int lastblock = 0;
      41                 :         23 :     const size_t total_len = typebits.size();
      42                 :         23 :     size_t i = 0;
      43                 :            : 
      44         [ +  + ]:         34 :     while (i < total_len) {
      45         [ +  + ]:         25 :         if (i + 2 > total_len) {
      46 [ +  - ][ +  - ]:          4 :             isc_throw(DNSMessageFORMERR, rrtype_name <<
                 [ +  - ]
      47                 :            :                       " RDATA from wire: incomplete bit map field");
      48                 :            :         }
      49                 :         23 :         const unsigned int block = typebits[i];
      50                 :         46 :         const size_t len = typebits[i + 1];
      51                 :            :         // Check that bitmap window blocks are in the correct order.
      52 [ +  + ][ +  - ]:         23 :         if (!first && block <= lastblock) {
      53 [ +  - ][ +  - ]:          8 :             isc_throw(DNSMessageFORMERR, rrtype_name <<
         [ +  - ][ +  - ]
      54                 :            :                       " RDATA from wire: Disordered window blocks found: "
      55                 :            :                       << lastblock << " then " << block);
      56                 :            :         }
      57                 :            :         // Check for legal length
      58         [ +  + ]:         21 :         if (len < 1 || len > 32) {
      59 [ +  - ][ +  - ]:         18 :             isc_throw(DNSMessageFORMERR, rrtype_name <<
                 [ +  - ]
      60                 :            :                       " RDATA from wire: Invalid bitmap length: " << len);
      61                 :            :         }
      62                 :            :         // Check for overflow.
      63                 :         15 :         i += 2;
      64         [ +  + ]:         15 :         if (i + len > total_len) {
      65 [ +  - ][ +  - ]:          6 :             isc_throw(DNSMessageFORMERR, rrtype_name <<
                 [ +  - ]
      66                 :            :                       " RDATA from wire: bitmap length too large: " << len);
      67                 :            :         }
      68                 :            :         // The last octet of the bitmap must be non zero.
      69         [ +  + ]:         13 :         if (typebits[i + len - 1] == 0) {
      70 [ +  - ][ +  - ]:          4 :             isc_throw(DNSMessageFORMERR, rrtype_name <<
                 [ +  - ]
      71                 :            :                       " RDATA from wire: bitmap ending an all-zero byte");
      72                 :            :         }
      73                 :            : 
      74                 :         11 :         i += len;
      75                 :         11 :         lastblock = block;
      76                 :         11 :         first = false;
      77                 :            :     }
      78                 :          9 : }
      79                 :            : 
      80                 :            : void
      81                 :       2762 : buildBitmapsFromText(const char* const rrtype_name,
      82                 :            :                      istringstream& iss, vector<uint8_t>& typebits)
      83                 :            : {
      84                 :            :     uint8_t bitmap[8 * 1024];       // 64k bits
      85                 :            :     memset(bitmap, 0, sizeof(bitmap));
      86                 :            : 
      87         [ +  + ]:       8043 :     do {
      88                 :       8048 :         string type;
      89         [ +  - ]:       8048 :         iss >> type;
      90 [ +  - ][ +  + ]:       8048 :         if (iss.bad() || iss.fail()) {
                 [ +  + ]
      91 [ +  - ][ +  - ]:          4 :             isc_throw(InvalidRdataText, "Unexpected input for "
         [ +  - ][ +  - ]
      92                 :            :                       << rrtype_name << " bitmap");
      93                 :            :         }
      94                 :            :         try {
      95         [ +  + ]:       8046 :             const int code = RRType(type).getCode();
      96                 :       8043 :             bitmap[code / 8] |= (0x80 >> (code % 8));
      97         [ -  + ]:          6 :         } catch (const InvalidRRType&) {
      98 [ -  + ][ -  + ]:          6 :             isc_throw(InvalidRdataText, "Invalid RRtype in "
         [ -  + ][ -  + ]
                 [ -  + ]
      99                 :            :                       << rrtype_name << " bitmap: " << type);
     100                 :            :         }
     101                 :       8043 :     } while (!iss.eof());
     102                 :            : 
     103         [ +  + ]:     708549 :     for (int window = 0; window < 256; ++window) {
     104                 :            :         int octet;
     105         [ +  + ]:   23274287 :         for (octet = 31; octet >= 0; octet--) {
     106         [ +  + ]:   22571256 :             if (bitmap[window * 32 + octet] != 0) {
     107                 :            :                 break;
     108                 :            :             }
     109                 :            :         }
     110         [ +  + ]:     705792 :         if (octet < 0) {
     111                 :     703031 :             continue;
     112                 :            :         }
     113                 :       2761 :         typebits.push_back(window);
     114                 :       2761 :         typebits.push_back(octet + 1);
     115         [ +  + ]:      19610 :         for (int i = 0; i <= octet; ++i) {
     116                 :      16849 :             typebits.push_back(bitmap[window * 32 + i]);
     117                 :            :         }
     118                 :            :     }
     119                 :       2757 : }
     120                 :            : 
     121                 :            : void
     122                 :        608 : bitmapsToText(const vector<uint8_t>& typebits, ostringstream& oss) {
     123                 :            :     // In the following loop we use string::at() rather than operator[].
     124                 :            :     // Since the index calculation is a bit complicated, it will be safer
     125                 :            :     // and easier to find a bug (if any).  Note that this conversion method
     126                 :            :     // is generally not expected to be very efficient, so the slight overhead
     127                 :            :     // of at() should be acceptable.
     128                 :        608 :     const size_t typebits_len = typebits.size();
     129                 :        608 :     size_t len = 0;
     130         [ +  + ]:       1214 :     for (size_t i = 0; i < typebits_len; i += len) {
     131         [ -  + ]:        606 :         assert(i + 2 <= typebits.size());
     132                 :        606 :         const unsigned int block = typebits.at(i);
     133                 :        606 :         len = typebits.at(i + 1);
     134         [ -  + ]:        606 :         assert(len > 0 && len <= 32);
     135                 :        606 :         i += 2;
     136         [ +  + ]:       4785 :         for (size_t j = 0; j < len; ++j) {
     137         [ +  + ]:       4179 :             if (typebits.at(i + j) == 0) {
     138                 :       2984 :                 continue;
     139                 :            :             }
     140         [ +  + ]:      10755 :             for (size_t k = 0; k < 8; ++k) {
     141         [ +  + ]:       9560 :                 if ((typebits.at(i + j) & (0x80 >> k)) == 0) {
     142                 :       8031 :                     continue;
     143                 :            :                 }
     144                 :       1529 :                 const unsigned int t = block * 256 + j * 8 + k;
     145         [ -  + ]:       1529 :                 assert(t < 65536);
     146                 :       1529 :                 oss << " " << RRType(t);
     147                 :            :             }
     148                 :            :         }
     149                 :            :     }
     150                 :        608 : }
     151                 :            : }
     152                 :            : }
     153                 :            : }
     154                 :            : }
     155                 :            : }
     156                 :      66614 : }

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