Linux SocketCan client server demo hacking

时间:2021-07-20 12:52:49
/***********************************************************************
* Linux SocketCan client server demo hacking
* 说明:
* 本文主要是解读Linux上的SocketCan的基本使用方法,内容和Linux上的
* 网络编程差不多。
*
* 2016-3-28 深圳 南山平山村 曾剑锋
**********************************************************************/ 一、cat client.c
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/can.h> #ifndef PF_CAN
#define PF_CAN 29
#endif #ifndef AF_CAN
#define AF_CAN PF_CAN
#endif int main()
{
int s;
unsigned long nbytes;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame; // 创建一个SocketCan
s = socket(PF_CAN,SOCK_RAW,CAN_RAW); // 设置一些参数,这个是使用的can网络的设备号
strcpy((char *)(ifr.ifr_name),"can0");
ioctl(s,SIOCGIFINDEX,&ifr);
printf("can0 can_ifindex = %x\n",ifr.ifr_ifindex); // 设置使用CAN协议
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
bind(s,(struct sockaddr*)&addr,sizeof(addr)); // 设置发送到的设备id
frame.can_id = 0x123;
strcpy((char *)frame.data,"hello");
frame.can_dlc = strlen(frame.data); printf("Send a CAN frame from interface %s\n",ifr.ifr_name); // 发送数据
nbytes = sendto(s,&frame,sizeof(struct can_frame),,(struct sockaddr*)&addr,sizeof(addr)); return ;
} 二、cat server.c
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/can.h> #ifndef PF_CAN
#define PF_CAN 29
#endif #ifndef AF_CAN
#define AF_CAN PF_CAN
#endif int main()
{
int s;
unsigned long nbytes,len;
struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame; // 创建一个SocketCan
s = socket(PF_CAN,SOCK_RAW,CAN_RAW); // 指定使用的Can网络
strcpy(ifr.ifr_name,"can0");
ioctl(s,SIOCGIFINDEX,&ifr);
printf("can0 can_ifindex = %x\n",ifr.ifr_ifindex); // 指定使用的协议,并绑定
//bind to all enabled can interface
addr.can_family = AF_CAN;
addr.can_ifindex =;
bind(s,(struct sockaddr*)&addr,sizeof(addr)); // 获取数据
nbytes = recvfrom(s,&frame,sizeof(struct can_frame),,(struct sockaddr *)&addr,&len); /*get interface name of the received CAN frame*/
ifr.ifr_ifindex = addr.can_ifindex;
ioctl(s,SIOCGIFNAME,&ifr);
printf("Received a CAN frame from interface %s\n",ifr.ifr_name);
printf("frame message\n"
"--can_id = %x\n"
"--can_dlc = %x\n"
"--data = %s\n",frame.can_id,frame.can_dlc,frame.data); return ;
}