ICMP-Ping Can not Touch

Reference:https://github.com/davidgatti/How-to-Deconstruct-Ping-with-C-and-NodeJS

 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 int32_t checksum(uint16_t * buf,int32_t len);
10 int main(int argc,char * argv[]){
11   int s = socket(PF_INET,SOCK_RAW,1);
12   if(s <= 0){
13     perror("Socker error");
14     exit(0);
15   }
16   typedef struct{
17     uint8_t type;
18     uint8_t code;
19     uint16_t chksum;
20     uint16_t identifier;
21     uint16_t sequence_number;
22     uint32_t data;
23   }icmp_hdr_t;
24   icmp_hdr_t pckt;
25   pckt.type = 8;
26   pckt.code = 0;
27   pckt.chksum = 0;
28   pckt.identifier = getpid();
29   printf("My pid:%04X\n\n", pckt.identifier);
30   pckt.sequence_number = 1;
31   pckt.data = 0;
32   pckt.chksum = checksum((uint16_t * )&pckt,sizeof(pckt));
33   struct sockaddr_in addr;
34   addr.sin_family=AF_INET;
35   addr.sin_port = 0;
36   addr.sin_addr.s_addr = inet_addr(argv[1]);
37   int actionSendResult = sendto(s,&pckt,sizeof(pckt),0,(struct sockaddr *)&addr,sizeof(addr));
38   if(actionSendResult<=0){
39     perror("Ping Error");
40     exit(0);
41   }
42   unsigned int resAddressSize;
43   unsigned char res[100]="";
44   struct sockaddr resAddress;
45   typedef struct{
46     uint8_t type;
47     uint8_t code;
48     uint16_t chksum;
49     uint16_t identifier;
50     uint16_t sequence_number;
51   }icmp_response_t;
52   int ressponse = recvfrom(s,res,sizeof(res),0,&resAddress,&resAddressSize);
53   if(ressponse>0){
54     icmp_response_t * echo_response;
55     echo_response = (icmp_response_t * )&res[20];
56     printf("Response looks like:\n");
57     for(int i=0;i<ressponse;i++) printf("%02hhX ",res[i]);
58     printf("\n\n" );
59     printf("type:%02hhX,code:%02hhX,chksum:%04X\nidentifier:%04X,sequence:%04X\n\n",echo_response->type,echo_response->code,echo_response->chksum,echo_response->identifier,echo_response->sequence_number );
60     exit(0);
61   }
62   else{
63     perror("Response Error");
64     exit(0);
65   }
66   return 0;
67 }
68 int32_t checksum(uint16_t * buf,int32_t len){
69   int32_t nleft=len;
70   int32_t sum=0;
71   uint16_t * w=buf;
72   uint16_t answer=0;
73   while (nleft>1) {
74     sum+=*w++;
75     nleft-=2;
76   }
77   if(nleft==1){
78     sum+=*(uint8_t * )w;
79   }
80   sum=(sum>>16)+(sum&0xFFFF);
81   sum+=(sum>>16);
82   answer=~sum;
83   return answer;}

 

 

Ping Can not Touch

Wireshark has catch nothing but recvfrom() get blows response

 

My pid:10F5

Response looks like:
45 [C0] [00 3C] [3D BD] 00 00 40 01 [E3 77]

區分服務領域 1100 Identification      HeaderCheckSum
                                                        
[AC 10 00 56] [AC 10 00 56] 03 01 FC FE 00 00 00 00
                   
                            Host Unreachable

45 00 [00 20]:32 [05 DB] 40 00 40 01 [DC 54]

[AC 10 00 56] [AC 10 00 37]

08 00 16 0E [F5 10] EC E0 00 00 00 00

                  
type:03,code:01,chksum:FEFC
identifier:0000,sequence:0000

 _________________________________________
|___type____|___code____|____checksum_______|
|____identifier___|____sequence_number________|
|________________data_____________________|

 

the package include ac100037 all about:
ARP: Who has 172.16.0.55? Tell 172.16.0.86