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#include <arpa/inet.h>
#include <linux/if_packet.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/ether.h>
 
#define BUF_SIZ		65536
#define SEND 0
#define RECV 1
 
 
 
void send_message(){
 
	//Do something here
memset(&sk_addr, 0, sk_addr_size); 
//set sk_addr for 0
sk_addr.sll_ifindex = if_idx.ifr_ifindex;
sk_addr.sll_halen = ETH_ALEN; 
 
byteSent = sendto(sockfd, buf, BUF_SIZ, 0, (struct socketaddr*)&sk_addr, sizeof(struct sockaddr_ll));
printf("success");
 
}
 
void recv_message(){
 
	//Do something here
memset(&sk_addr, 0, sk_addr_size);
 
recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
printf("receive %s\n", buf);
}
//Sub function
 
int main(int argc, char *argv[])
{
	int mode;
	char hw_addr[6];
	char interfaceName[IFNAMSIZ];
	char buf[BUF_SIZ];
	memset(buf, 0, BUF_SIZ);
	//set buf for 0
 
	int correct=0;
	if (argc > 1){
		if(strncmp(argv[1],"Send", 4)==0){
			if (argc == 5){
				mode=SEND; 
				sscanf(argv[3], "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &hw_addr[0], &hw_addr[1], &hw_addr[2], &hw_addr[3], &hw_addr[4], &hw_addr[5]);
				//set hw_addr
				strncpy(buf, argv[4], BUF_SIZ);
				//set buf
				correct=1;
				printf("  buf: %s\n", buf);
			}
		}
		else if(strncmp(argv[1],"Recv", 4)==0){
			if (argc == 3){
				mode=RECV;
				correct=1;
			}
		}
		strncpy(interfaceName, argv[2], IFNAMSIZ);   //set interfacename  
	 }   //set mode
	 if(!correct){
		fprintf(stderr, "./455_proj2 Send <InterfaceName>  <DestHWAddr> <Message>\n");
		fprintf(stderr, "./455_proj2 Recv <InterfaceName>\n");
		exit(1);
	 }
 
	//Do something here
int sockfd = 0;
struct sockaddr_ll sk_addr;
int sk_addr_size = sizeof(struct sockaddr_ll);
 
//Do something here
 
if((sockfd = ioctl(sockfd, SIOCGIFINDEX, htons(ETH_P_IP))) < 0){ //set sockfd
perror("socket fail");
exit(1);
}
 
 
	if(mode == SEND){
		send_message();
	}
	else if (mode == RECV){
		recv_message();
	}
 
	return 0;
}

prog.cpp: In function ‘void send_message()’:
prog.cpp:20:9: error: ‘sk_addr’ was not declared in this scope
 memset(&sk_addr, 0, sk_addr_size);
         ^~~~~~~
prog.cpp:20:9: note: suggested alternative: ‘s6_addr’
 memset(&sk_addr, 0, sk_addr_size);
         ^~~~~~~
         s6_addr
prog.cpp:20:21: error: ‘sk_addr_size’ was not declared in this scope
 memset(&sk_addr, 0, sk_addr_size);
                     ^~~~~~~~~~~~
prog.cpp:20:21: note: suggested alternative: ‘sockaddr_in6’
 memset(&sk_addr, 0, sk_addr_size);
                     ^~~~~~~~~~~~
                     sockaddr_in6
prog.cpp:22:23: error: ‘if_idx’ was not declared in this scope
 sk_addr.sll_ifindex = if_idx.ifr_ifindex;
                       ^~~~~~
prog.cpp:22:23: note: suggested alternative: ‘ifaddr’
 sk_addr.sll_ifindex = if_idx.ifr_ifindex;
                       ^~~~~~
                       ifaddr
prog.cpp:25:1: error: ‘byteSent’ was not declared in this scope
 byteSent = sendto(sockfd, buf, BUF_SIZ, 0, (struct socketaddr*)&sk_addr, sizeof(struct sockaddr_ll));
 ^~~~~~~~
prog.cpp:25:19: error: ‘sockfd’ was not declared in this scope
 byteSent = sendto(sockfd, buf, BUF_SIZ, 0, (struct socketaddr*)&sk_addr, sizeof(struct sockaddr_ll));
                   ^~~~~~
prog.cpp:25:19: note: suggested alternative: ‘socket’
 byteSent = sendto(sockfd, buf, BUF_SIZ, 0, (struct socketaddr*)&sk_addr, sizeof(struct sockaddr_ll));
                   ^~~~~~
                   socket
prog.cpp:25:27: error: ‘buf’ was not declared in this scope
 byteSent = sendto(sockfd, buf, BUF_SIZ, 0, (struct socketaddr*)&sk_addr, sizeof(struct sockaddr_ll));
                           ^~~
prog.cpp: In function ‘void recv_message()’:
prog.cpp:33:9: error: ‘sk_addr’ was not declared in this scope
 memset(&sk_addr, 0, sk_addr_size);
         ^~~~~~~
prog.cpp:33:9: note: suggested alternative: ‘s6_addr’
 memset(&sk_addr, 0, sk_addr_size);
         ^~~~~~~
         s6_addr
prog.cpp:33:21: error: ‘sk_addr_size’ was not declared in this scope
 memset(&sk_addr, 0, sk_addr_size);
                     ^~~~~~~~~~~~
prog.cpp:33:21: note: suggested alternative: ‘sockaddr_in6’
 memset(&sk_addr, 0, sk_addr_size);
                     ^~~~~~~~~~~~
                     sockaddr_in6
prog.cpp:35:1: error: ‘recvLen’ was not declared in this scope
 recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
 ^~~~~~~
prog.cpp:35:1: note: suggested alternative: ‘recvmsg’
 recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
 ^~~~~~~
 recvmsg
prog.cpp:35:20: error: ‘sockfd’ was not declared in this scope
 recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
                    ^~~~~~
prog.cpp:35:20: note: suggested alternative: ‘socket’
 recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
                    ^~~~~~
                    socket
prog.cpp:35:28: error: ‘buf’ was not declared in this scope
 recvLen = recvfrom(sockfd, buf, BUF_SIZ, 0, (struct sockaddr*)&sk_addr, &sk_addr_size);
                            ^~~

Standard output is empty