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, );
          ptr += ; 

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

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

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

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

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

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

          memset(&address, , 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-- > ) {
                  if (sendto(s, magic_buf, sizeof(magic_buf), ,
                       (struct sockaddr *)&address, sizeof(address)) < ) {
                          printf("sendto\n");
                          exit(EXIT_FAILURE);
                  }
                  sleep();
          } 

          exit(EXIT_SUCCESS);
 }