PING-pingwithbaremin

Posted 2020-10-28 bird-xu

/*      */
 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<arpa/inet.h>
 4 #include<sys/socket.h>
 5 #include<fcntl.h>
 6 #include<unistd.h>
 7 #include<netdb.h>
 8 
 9 int main(){
10      int s = socket(PF_INET,SOCK_RAW,1);
11     printf("--%d--\\n",s);
12      if (s <= 0){
13       perror("socket erro");
14       exit(0);
15   }
16      typedef struct{
17          uint8_t type;
18          uint8_t code;
19          uint16_t chksum;
20          uint32_t data;
21   }icmp_hdr_t;
22 
23   icmp_hdr_t  pckt;
24 
25   pckt.type=8;
26   pckt.code=0;
27   pckt.chksum=0xfff7;//
28   pckt.data=0;//4Byte
29 
30     struct sockaddr_in addr;
31  
32   addr.sin_family=AF_INET;
33   addr.sin_port=0;
34   addr.sin_addr.s_addr=inet_addr("8.8.8.8");//
35   //addr.sin_zero[]="";
36     int actionSendResult=sendto(s,&pckt,sizeof(pckt),0,(struct sockaddr *)&addr,sizeof(addr));
37 
38     if(actionSendResult<=0){
39       perror("ping erro");
40       exit(0);
41   }
42     unsigned int resAddressSize;
43     unsigned char res[100]="";
44     struct sockaddr resAddress;
45       printf("%u\\n",resAddressSize);
46     int ressponse=recvfrom(s,res,sizeof(res),0,&resAddress,&resAddressSize);
47     if(ressponse>0){
48      printf("message is %d bytes long, and looks like this :\\n",ressponse);
49     for(int i=0;i<ressponse;i++) printf("%02hhx ",res[i]);
50     printf("\\n");
51     //exit(0);
52   
53   }else{
54     perror("ressponse error");
55     exit(0);
56   }
57   printf("resAddressSize:%u\\n",resAddressSize);
58     struct sockaddr_in * temp;
59   temp=(struct sockaddr_in *)&resAddress;
60   printf("protocol:%d\\n",temp->sin_family);
61   printf("port:%d\\n",temp->sin_port);
62     return 0;
63 }