android firmware 利用UDP socket发送Magic Packet--c语言版本

android firmware 利用UDP socket发送Magic Packet

1 Magic Packet格式：

  6个0xFF + 16个Dst Mac Address

2 代码需要设置目的MAC地址， 目的IP地址和使用的端口

#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 
#include <unistd.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include <netdb.h> 

void generate_magic_packet(void *magic_buf, void *mac) 
{ 
         int i; 
         char *ptr; 

         ptr = magic_buf; 
         memset(ptr, 0xFF, 6); 
         ptr += 6; 

         for(i = 0; i < 16; ++i) { 
                 memcpy(ptr, mac, 6); 
                 ptr += 6; 
         } 
} 

int main(int argc, char **argv) 
{ 
         int s; 
         int packet_num = 10; 
         char c; 

         unsigned char mac[6] = {0x94, 0x39, 0xE5, 0x02, 0x5E, 0xC9}; 
         char dstip[256] = "192.168.1.106"; 
         int port = 1900; 

         struct sockaddr_in address; 
         char magic_buf[6 + 6 * 16] = {0}; 

         daemon(0,0);    /* run in background */ 

         s = socket(AF_INET, SOCK_DGRAM, 0); 
         if (s == -1) { 
                 perror("Opening socket"); 
                 exit(EXIT_FAILURE); 
         } 

         memset(&address, 0, sizeof(struct sockaddr_in)); 
         address.sin_family = AF_INET; 
         address.sin_addr.s_addr = inet_addr(dstip); 
         address.sin_port = htons(port); 

         generate_magic_packet(magic_buf, mac); 

         /* ten packets. TODO: use ping to check whether the destination is on or else. */ 
         while (packet_num-- > 0) { 
                 if (sendto(s, magic_buf, sizeof(magic_buf), 0, 
                      (struct sockaddr *)&address, sizeof(address)) < 0) { 
                         printf("sendto
"); 
                         exit(EXIT_FAILURE); 
                 } 
                 sleep(1); 
         } 

         exit(EXIT_SUCCESS); 
}