163 lines
4.8 KiB
C++
163 lines
4.8 KiB
C++
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/*
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; Project: Open Vehicle Monitor System
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; Module: CAN dump framework
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; Date: 18th January 2018
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;
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; (C) 2018 Mark Webb-Johnson
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;
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; Permission is hereby granted, free of charge, to any person obtaining a copy
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; of this software and associated documentation files (the "Software"), to deal
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; in the Software without restriction, including without limitation the rights
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; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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; copies of the Software, and to permit persons to whom the Software is
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; furnished to do so, subject to the following conditions:
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;
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; The above copyright notice and this permission notice shall be included in
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; all copies or substantial portions of the Software.
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;
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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; THE SOFTWARE.
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*/
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#include "ovms_log.h"
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static const char *TAG = "canformat-pcap";
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#include "canformat_pcap.h"
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#include <errno.h>
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#include <endian.h>
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#include "pcp.h"
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class OvmsCanFormatPCAPInit
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{
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public: OvmsCanFormatPCAPInit();
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} MyOvmsCanFormatPCAPInit __attribute__ ((init_priority (4505)));
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OvmsCanFormatPCAPInit::OvmsCanFormatPCAPInit()
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{
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ESP_LOGI(TAG, "Registering CAN Format: PCAP (4505)");
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MyCanFormatFactory.RegisterCanFormat<canformat_pcap>("pcap");
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}
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canformat_pcap::canformat_pcap(const char* type)
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: canformat(type)
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{
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}
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canformat_pcap::~canformat_pcap()
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{
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}
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std::string canformat_pcap::get(CAN_log_message_t* message)
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{
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pcaprec_can_t m;
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if (message->type != CAN_LogFrame_RX)
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{
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return std::string("");
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}
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memset(&m,0,sizeof(m));
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m.hdr.ts_sec = htobe32(message->timestamp.tv_sec);
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m.hdr.ts_usec = htobe32(message->timestamp.tv_usec);
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m.hdr.incl_len = htobe32(16);
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m.hdr.orig_len = htobe32(16);
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uint32_t idfl = message->frame.MsgID;
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if (message->frame.FIR.B.FF == CAN_frame_ext) idfl |= CANFORMAT_PCAP_FL_EXT;
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if (message->frame.FIR.B.RTR == CAN_RTR) idfl |= CANFORMAT_PCAP_FL_RTR;
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m.phdr.idflags = htobe32(idfl);
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m.phdr.len = message->frame.FIR.B.DLC;
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memcpy(m.data, message->frame.data.u8, message->frame.FIR.B.DLC);
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return std::string((const char*)&m, sizeof(m));
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}
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std::string canformat_pcap::getheader(struct timeval *time)
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{
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pcap_hdr_t h;
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struct timeval t;
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if (time == NULL)
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{
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gettimeofday(&t,NULL);
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time = &t;
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}
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memset(&h,0,sizeof(h));
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h.magic_number = htobe32(0xa1b2c3d4);
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h.version_major = htobe16(2);
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h.version_minor = htobe16(4);
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h.snaplen = htobe32(8);
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h.network = htobe32(0xe3);
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return std::string((const char*)&h, sizeof(h));
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}
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size_t canformat_pcap::put(CAN_log_message_t* message, uint8_t *buffer, size_t len, bool* hasmore, canlogconnection* clc)
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{
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union
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{
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pcap_hdr_t header;
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pcaprec_can_t record;
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} m;
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if (m_buf.FreeSpace()==0) SetServeDiscarding(true); // Buffer full, so discard from now on
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if (IsServeDiscarding()) return len; // Quick return if discarding
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size_t consumed = Stuff(buffer,len); // Stuff m_buf with as much as possible
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if (m_buf.UsedSpace() < 24) return consumed; // Insufficient data so far
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// At this point, we have our 24 bytes...
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*hasmore = true; // Call us again to see if we have more frames to process
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m_buf.Peek(24,(uint8_t*)&m);
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uint32_t magic = be32toh(m.header.magic_number);
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if (magic == 0xa1b2c3d4)
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{
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// This is a PCAP header - just ignore it
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if (be32toh(m.header.network) != 0xe3)
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{
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ESP_LOGE(TAG,"PCAP header network != 0xe3: Discarding");
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SetServeDiscarding(true);
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return consumed;
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}
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m_buf.Pop(24,(uint8_t*)&m);
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}
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else if ((magic == 0xd4c3b2a1)||
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(magic == 0xa1b23c4d)||
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(magic == 0x4d3cb2a1))
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{
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ESP_LOGE(TAG,"pcap format %08x not supported: Discarding",magic);
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SetServeDiscarding(true);
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return consumed;
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}
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if (m_buf.UsedSpace() < sizeof(pcaprec_can_t)) return consumed; // Insufficient data so far
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m_buf.Pop(sizeof(pcaprec_can_t), (uint8_t*)&m);
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uint32_t idf = be32toh(m.record.phdr.idflags);
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if (idf & CANFORMAT_PCAP_FL_MSG)
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{
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// Just ignore it
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return consumed;
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}
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message->type = CAN_LogFrame_RX;
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message->frame.FIR.B.RTR = (idf & CANFORMAT_PCAP_FL_RTR)?CAN_RTR:CAN_no_RTR;
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message->frame.FIR.B.FF = (idf & CANFORMAT_PCAP_FL_EXT)?CAN_frame_ext:CAN_frame_std;
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message->frame.MsgID = idf & CANFORMAT_PCAP_FL_MASK;
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message->origin = MyCan.GetBus(0);
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message->frame.FIR.B.DLC = m.record.phdr.len;
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memcpy(message->frame.data.u8, m.record.data, m.record.phdr.len);
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return consumed;
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}
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