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[apps/agl-service-can-low-level.git] / CAN-binder / low-can-binding / utils / socketcan-bcm.cpp
1 /*
2  * Copyright (C) 2015, 2016 ,2017 "IoT.bzh"
3  * Author "Romain Forlot" <romain.forlot@iot.bzh>
4  * Author "Loïc Collignon" <loic.collignon@iot.bzh>
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 "socketcan-bcm.hpp"
19
20 #include <net/if.h>
21 #include <sys/ioctl.h>
22 #include <fcntl.h>
23
24 #include "../binding/application.hpp"
25
26 namespace utils
27 {
28         /// @brief Connect the socket.
29         /// @return 0 if success.
30         int socketcan_bcm_t::connect(const struct sockaddr* addr, socklen_t len)
31         {
32                 return socket_ != INVALID_SOCKET ? ::connect(socket_, addr, len) : 0;
33         }
34
35         /// @brief Open a raw socket CAN.
36         /// @param[in] device_name is the kernel network device name of the CAN interface.
37         ///
38         /// @return Upon successful completion, shall return a non-negative integer, the socket file descriptor. Otherwise, a value of -1 shall be returned and errno set to indicate the error.
39         int socketcan_bcm_t::open(std::string device_name)
40         {
41                 close();
42                 
43                 struct ifreq ifr;
44                 socket_ = socketcan_t::open(PF_CAN, SOCK_DGRAM, CAN_BCM);
45
46                 // Attempts to open a socket to CAN bus
47                 ::strcpy(ifr.ifr_name, device_name.c_str());
48                 DEBUG(binder_interface, "%s: BCM socket ifr_name is : %s", __FUNCTION__, ifr.ifr_name);
49                 if(::ioctl(socket_, SIOCGIFINDEX, &ifr) < 0)
50                 {
51                         ERROR(binder_interface, "%s: ioctl failed. Error was : %s", __FUNCTION__, strerror(errno));
52                         close();
53                 }
54                 else
55                 {
56                         tx_address_.can_family = AF_CAN;
57                         tx_address_.can_ifindex = ifr.ifr_ifindex;
58
59                         if(connect((struct sockaddr *)&tx_address_, sizeof(tx_address_)) < 0)
60                         {
61                                 ERROR(binder_interface, "%s: Connect failed. %s", __FUNCTION__, strerror(errno));
62                                 close();
63                         }
64                         // Needed because of using systemD event loop. See sd_event_add_io manual.
65                         fcntl(socketcan_t::socket_, F_SETFL, O_NONBLOCK);
66                 }
67                 return socket_;
68         }
69
70         socketcan_bcm_t& operator>>(socketcan_bcm_t& s, can_message_t& cm)
71         {
72                 struct {
73                         struct bcm_msg_head msg_head;
74                         struct can_frame frames;
75                 } msg;
76
77                 const struct sockaddr_can& addr = s.get_tx_address();
78                 socklen_t addrlen = sizeof(addr);
79                 struct ifreq ifr;
80
81                 ssize_t nbytes = ::recvfrom(s.socket(), &msg, sizeof(msg), 0, (struct sockaddr*)&addr, &addrlen);
82                 ifr.ifr_ifindex = addr.can_ifindex;
83                 ioctl(s.socket(), SIOCGIFNAME, &ifr);
84
85                 DEBUG(binder_interface, "Data available: %i bytes read", (int)nbytes);
86                 DEBUG(binder_interface, "read: Found on bus %s:\n id: %X, length: %X, data %02X%02X%02X%02X%02X%02X%02X%02X", ifr.ifr_name, msg.msg_head.can_id, msg.frames.can_dlc,
87                         msg.frames.data[0], msg.frames.data[1], msg.frames.data[2], msg.frames.data[3], msg.frames.data[4], msg.frames.data[5], msg.frames.data[6], msg.frames.data[7]);
88
89                 struct timeval tv;
90                 ioctl(s.socket(), SIOCGSTAMP, &tv);
91                 uint64_t timestamp = 1000000 * tv.tv_sec + tv.tv_usec;
92                 cm = ::can_message_t::convert_from_frame(msg.frames ,
93                                 nbytes-sizeof(struct bcm_msg_head),
94                                 timestamp);
95                 if(application_t::instance().get_diagnostic_manager().is_diagnostic_response(cm))
96                         {cm.set_sub_id(msg.frames.data[2]);}
97                 else
98                         {cm.set_sub_id((int)s.socket());}
99
100                 return s;
101         }
102 }