low-can-binding/utils/socketcan-j1939/socketcan-j1939.cpp

   1 /*
   2  * Copyright (C) 2018, 2019 "IoT.bzh"
   3  * Author "Arthur Guyader" <arthur.guyader@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *       http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #include <unistd.h>
  19 #include <sys/ioctl.h>
  20 #include <fcntl.h>
  21 #include <iostream>
  22 #include <algorithm>
  23 #include <vector>
  24 #include "./socketcan-j1939.hpp"
  25 #include "socketcan-j1939-addressclaiming.hpp"
  26
  27 namespace utils
  28 {
  29         std::mutex socketcan_j1939_t::mutex_claiming_;
  30         std::condition_variable socketcan_j1939_t::signal_address_claiming_;
  31
  32         /**
  33          * @brief Apply a filter to the socket
  34          *
  35          * @param name - The name you want to receive
  36          * @param pgn - The pgn you want to receive
  37          * @param addr - The addr you want to receive
  38          * @param name_mask - The mask to apply to the name (No mask : J1939_NO_NAME)
  39          * @param pgn_mask - The mask to apply to the pgn (No mask : J1939_NO_PGN)
  40          * @param addr_mask - The mask to apply to the addr (No mask : J1939_NO_ADDR)
  41          */
  42         void socketcan_j1939_t::add_filter(name_t name, pgn_t pgn, uint8_t addr, name_t name_mask, pgn_t pgn_mask, uint8_t addr_mask)
  43         {
  44         //      AFB_DEBUG("[socketcan_j1939_t][add_filter] PGN : %" PRIu32 " ; NAME : %" PRIu64 " ; ADDR : %" PRIu8,pgn,(long unsigned int)name,addr);
  45         //      AFB_DEBUG("PGN_MASK : %" PRIu32 " ; NAME_MASK : %" PRIu64 "; ADDR_MASK : %" PRIu8,pgn_mask,(long unsigned int)name_mask,addr_mask);
  46                 int filter_on = 0;
  47                 struct j1939_filter filter;
  48                 memset(&filter, 0, sizeof(filter));
  49                 if (name)
  50                 {
  51                         filter.name = name;
  52                         if(name_mask != J1939_NO_NAME)
  53                         {
  54                                 filter.name_mask = name_mask;
  55                         } else
  56                         {
  57                                 filter.name_mask = ~0ULL;
  58                         }
  59                         ++filter_on;
  60                 }
  61
  62                 if (addr < 0xff)
  63                 {
  64                         filter.addr = addr;
  65                         if(addr_mask != J1939_NO_ADDR)
  66                         {
  67                                 filter.addr_mask = addr_mask;
  68                         } else
  69                         {
  70                                 filter.addr_mask = ~0;
  71                         }
  72                         ++filter_on;
  73                 }
  74                 if (pgn <= J1939_PGN_MAX)
  75                 {
  76                         filter.pgn = pgn;
  77                         if(pgn_mask != J1939_NO_PGN)
  78                         {
  79                                 filter.pgn_mask = pgn_mask;
  80                         } else
  81                         {
  82                                 filter.pgn_mask = ~0;
  83                         }
  84                         ++filter_on;
  85                 }
  86                 if(filter_on)
  87                 {
  88                         setopt(SOL_CAN_J1939, SO_J1939_FILTER, &filter, sizeof(filter));
  89                 }
  90         }
  91
  92         /**
  93          * @brief Define some parameters on the socket
  94          *
  95          * @param promisc - Allows to accept all packets that the socket receives even if they are not addressed directly to it
  96          * @param recv_own_msgs - Allows you to receive your own packets
  97          * @param broadcast - Allows to write message with address brodcast (255)
  98          */
  99         void socketcan_j1939_t::define_opt(bool promisc, bool recv_own_msgs, bool broadcast)
 100         {
 101                 int promisc_i = 0;
 102                 int recv_own_msgs_i = 0;
 103                 int broadcast_i = 0;
 104
 105                 if(promisc) promisc_i = 1;
 106                 if(recv_own_msgs) recv_own_msgs_i=1;
 107                 if(broadcast) broadcast_i = 1;
 108
 109                 setopt(SOL_CAN_J1939, SO_J1939_PROMISC, &promisc_i, sizeof(promisc_i));
 110                 setopt(SOL_SOCKET, SO_BROADCAST, &broadcast_i, sizeof(broadcast_i));
 111         }
 112
 113
 114         /**
 115          * @brief Define the tx address for the bind function
 116          *
 117          * @param device_name - The device can that you want to bind
 118          * @param name - The name that you want to bind
 119          * @param pgn - The pgn that you want to bind
 120          * @param addr - The addr that you want to bindthat you want to bind
 121          */
 122         void socketcan_j1939_t::define_tx_address(std::string device_name, name_t name, pgn_t pgn, uint8_t addr)
 123         {
 124
 125                 ::strcpy(ifr_.ifr_name, device_name.c_str());
 126                 AFB_DEBUG("ifr_name is : %s", ifr_.ifr_name);
 127
 128
 129                 if(::ioctl(socket_, SIOCGIFINDEX, &ifr_) < 0)
 130                 {
 131                         AFB_ERROR("ioctl failed. Error was : %s", strerror(errno));
 132                         close();
 133                 }
 134                 else
 135                 {
 136                         tx_address_.can_ifindex = ifr_.ifr_ifindex;
 137                 }
 138
 139                 tx_address_.can_family = AF_CAN;
 140
 141
 142                 if(addr <= 0 || addr >= UINT8_MAX )
 143                 {
 144                         tx_address_.can_addr.j1939.addr = J1939_NO_ADDR;
 145                 }
 146                 else
 147                 {
 148                         tx_address_.can_addr.j1939.addr = addr;
 149                 }
 150
 151                 if(name <= 0 || name >= UINT64_MAX )
 152                 {
 153                         tx_address_.can_addr.j1939.name = J1939_NO_NAME;
 154                 }
 155                 else
 156                 {
 157                         tx_address_.can_addr.j1939.name = name;
 158                 }
 159
 160                 if(pgn <= 0 || pgn > J1939_PGN_MAX)
 161                 {
 162                         tx_address_.can_addr.j1939.pgn = J1939_NO_PGN;
 163                 }
 164                 else
 165                 {
 166                         tx_address_.can_addr.j1939.pgn = pgn;
 167                 }
 168
 169         }
 170
 171
 172         /**
 173          * @brief Open default socket
 174          *
 175          * @param device_name The device name to open the socket
 176          * @return int The number of the socket
 177          */
 178         int socketcan_j1939_t::open(std::string device_name)
 179         {
 180                 return open(device_name,0,0,0);
 181         }
 182
 183         /**
 184          * @brief Open a socket with name pgn and address
 185          *
 186          * @param device_name The device name to open the socket
 187          * @param name - The name that you want to bind
 188          * @param pgn - The pgn that you want to bind
 189          * @param addr - The addr that you want to bindthat you want to bind
 190          * @return int The number of the socket
 191          */
 192         int socketcan_j1939_t::open(std::string device_name, name_t name, pgn_t pgn, uint8_t addr)
 193         {
 194
 195                 socket_ = socketcan_t::open(PF_CAN, SOCK_DGRAM, CAN_J1939);
 196
 197                 define_tx_address(device_name,name,pgn,addr);
 198
 199                 if(bind((struct sockaddr *)&tx_address_, sizeof(tx_address_)) < 0)
 200                 {
 201                         AFB_ERROR("Bind failed. %s", strerror(errno));
 202                         close();
 203                 }
 204
 205                 return socket_;
 206         }
 207
 208         /**
 209          * @brief Launch recvfrom on the socket with blocking flag
 210          *
 211          * @return std::shared_ptr<message_t> The j1939 message that is read
 212          */
 213         std::shared_ptr<message_t> socketcan_j1939_t::read_message()
 214         {
 215                 return read_message(0);
 216         }
 217
 218         /**
 219          * @brief Launch recvfrom on the socket with the flag you want
 220          *
 221          * @param flag The flag param for the recvfrom
 222          * @return std::shared_ptr<message_t> The j1939 message that is read
 223          */
 224         std::shared_ptr<message_t> socketcan_j1939_t::read_message(int flag)
 225         {
 226                 socklen_t peernamelen;
 227                 std::shared_ptr<j1939_message_t> jm = std::make_shared<j1939_message_t>();
 228                 uint8_t data[128] = {0};
 229
 230                 struct sockaddr_can peername;
 231                 peernamelen = sizeof(peername);
 232                 ssize_t nbytes = recvfrom(socket_, &data, sizeof(data), flag, (struct sockaddr *)&peername,  &peernamelen);
 233
 234                 if(nbytes < 0)
 235                 {
 236                         return nullptr;
 237                 }
 238                 //AFB_DEBUG("Data available: %i bytes read", (int)nbytes);
 239
 240                 struct timeval tv;
 241                 ioctl(socket(), SIOCGSTAMP, &tv);
 242                 uint64_t timestamp = 1000000 * tv.tv_sec + tv.tv_usec;
 243                 jm = j1939_message_t::convert_from_addr(peername, data , nbytes, timestamp);
 244                 jm->set_sub_id((int)socket());
 245                 return jm;
 246         }
 247
 248         /**
 249          * @brief Write a j1939 message
 250          *
 251          * @param pgn The pgn that you want to emmit
 252          * @param data The data that you want to emmit
 253          * @param len_data The size of the data to emmit
 254          * @return int 0 if the message is correctly send
 255          */
 256         int socketcan_j1939_t::write_j1939_message(pgn_t pgn, std::vector<uint8_t> &data, uint32_t len_data)
 257         {
 258                 j1939_message_t msg = j1939_message_t(len_data, data, 0, 0, pgn, 0);
 259                 msg.set_sockname(pgn,J1939_NO_NAME,J1939_NO_ADDR);
 260                 return write_message(msg);
 261         }
 262
 263         /**
 264          * @brief Write a j1939 message
 265          *
 266          * @param m A j1939 message
 267          * @return int 0 if the message is correctly send
 268          */
 269         int socketcan_j1939_t::write_message(message_t& m)
 270         {
 271                 j1939_message_t& jm = reinterpret_cast<j1939_message_t&>(m);
 272                 sockaddr_can sockname =  jm.get_sockname();
 273                 uint8_t data[jm.get_data_vector().size()];
 274
 275                 for(int i=0; i<jm.get_data_vector().size(); i++)
 276                 {
 277                         data[i] = jm.get_data_vector()[i];
 278                 }
 279
 280                 if (sendto(socket_, &data, sizeof(data), 0, (const struct sockaddr *)&sockname, sizeof(sockname)) < 0)
 281                 {
 282                         AFB_ERROR("Error sending : %i %s", errno, ::strerror(errno));
 283                         return -errno;
 284                 }
 285                 return 0;
 286         }
 287 }