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Member "snort3_extra-3.1.51.0/src/codecs/cd_linux_sll/cd_linux_sll.cc" (20 Dec 2022, 2925 Bytes) of package /linux/misc/snort3_extra-3.1.51.0.tar.gz:

    1 //--------------------------------------------------------------------------
    2 // Copyright (C) 2014-2022 Cisco and/or its affiliates. All rights reserved.
    3 //
    4 // This program is free software; you can redistribute it and/or modify it
    5 // under the terms of the GNU General Public License Version 2 as published
    6 // by the Free Software Foundation.  You may not use, modify or distribute
    7 // this program under any other version of the GNU General Public License.
    8 //
    9 // This program is distributed in the hope that it will be useful, but
   10 // WITHOUT ANY WARRANTY; without even the implied warranty of
   11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12 // General Public License for more details.
   13 //
   14 // You should have received a copy of the GNU General Public License along
   15 // with this program; if not, write to the Free Software Foundation, Inc.,
   16 // 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   17 //--------------------------------------------------------------------------
   18 // cd_linux_sll.cc author Josh Rosenbaum <jrosenba@cisco.com>
   19 
   20 #include <daq_dlt.h>
   21 
   22 #include "framework/codec.h"
   23 #include "protocols/linux_sll.h"
   24 
   25 #define CD_LINUX_SLL_NAME "linux_sll"
   26 #define CD_LINUX_SLL_HELP_STR "support for Linux SLL"
   27 #define CD_LINUX_SLL_HELP ADD_DLT(CD_LINUX_SLL_HELP_STR, DLT_LINUX_SLL)
   28 
   29 using namespace snort;
   30 
   31 namespace
   32 {
   33 class LinuxSllCodec : public Codec
   34 {
   35 public:
   36     LinuxSllCodec() : Codec(CD_LINUX_SLL_NAME) { }
   37 
   38     void get_data_link_type(std::vector<int>&) override;
   39     bool decode(const RawData&, CodecData&, DecodeData&) override;
   40 };
   41 } // namespace
   42 
   43 void LinuxSllCodec::get_data_link_type(std::vector<int>& v)
   44 {
   45     v.push_back(DLT_LINUX_SLL);
   46 }
   47 
   48 bool LinuxSllCodec::decode(const RawData& raw, CodecData& data, DecodeData&)
   49 {
   50     /* do a little validation */
   51     if (raw.len < linux_sll::SLL_HDR_LEN)
   52         return false;
   53 
   54     /* lay the ethernet structure over the packet data */
   55     const linux_sll::SLLHdr* const sllh = reinterpret_cast<const linux_sll::SLLHdr*>(raw.data);
   56 
   57     /* grab out the network type */
   58     data.next_prot_id = static_cast<ProtocolId>(ntohs(sllh->sll_protocol));
   59     data.lyr_len = linux_sll::SLL_HDR_LEN;
   60     data.codec_flags |= CODEC_ETHER_NEXT;
   61     return true;
   62 }
   63 
   64 //-------------------------------------------------------------------------
   65 // api
   66 //-------------------------------------------------------------------------
   67 
   68 static Codec* ctor(Module*)
   69 { return new LinuxSllCodec(); }
   70 
   71 static void dtor(Codec* cd)
   72 { delete cd; }
   73 
   74 static const CodecApi linux_ssl_api =
   75 {
   76     {
   77         PT_CODEC,
   78         sizeof(CodecApi),
   79         CDAPI_VERSION,
   80         0,
   81         API_RESERVED,
   82         API_OPTIONS,
   83         CD_LINUX_SLL_NAME,
   84         CD_LINUX_SLL_HELP,
   85         nullptr,
   86         nullptr,
   87     },
   88     nullptr,
   89     nullptr,
   90     nullptr,
   91     nullptr,
   92     ctor,
   93     dtor,
   94 };
   95 
   96 SO_PUBLIC const BaseApi* snort_plugins[] =
   97 {
   98     &linux_ssl_api.base,
   99     nullptr
  100 };