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#pragma pack(4)
#define WIN32_LEAN_AND_MEAN
#include
#include
#include
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 // minimum 8 byte icmp packet (just header)
/* The IP header */
typedef struct iphdr {
unsigned int h_len:4; // length of the header
unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // total length of the packet
unsigned short ident; // unique identifier
unsigned short frag_and_flags; // flags
unsigned char ttl;
unsigned char proto; // protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP;
unsigned int destIP;
}IpHeader;
//
// ICMP header
//
typedef struct _ihdr {
BYTE i_type;
BYTE i_code; /* type sub code */
USHORT i_cksum;
USHORT i_id;
USHORT i_seq;
/* This is not the std header, but we reserve space for time */
ULONG timestamp;
}IcmpHeader;
#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE 32
#define MAX_PACKET 1024
#define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s))
#define xfree(p) HeapFree (GetProcessHeap(),0,(p))
void fill_icmp_data(char *, int);
USHORT checksum(USHORT *, int);
void decode_resp(char *,int ,struct sockaddr_in *);
void Usage(char *progname){
fprintf(stderr,"Usage:\n");
fprintf(stderr,"%s [data_size]\n",progname);
fprintf(stderr,"datasize can be up to 1Kb\n");
ExitProcess(STATUS_FAILED);
}
int main(int argc, char **argv){
WSADATA wsaData;
SOCKET sockRaw;
struct sockaddr_in dest,from;
struct hostent * hp;
int bread,datasize;
int fromlen = sizeof(from);
int timeout = 1000;
char *dest_ip;
char *icmp_data;
char *recvbuf;
unsigned int addr=0;
USHORT seq_no = 0;
if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){
fprintf(stderr,"WSAStartup failed: %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
}
if (argc <2 ) {
Usage(argv[0]);
}
sockRaw = WSASocket (AF_INET,
SOCK_RAW,
IPPROTO_ICMP,
NULL, 0,0);
if (sockRaw == INVALID_SOCKET) {
fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
timeout = 1000;
bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
memset(&dest,0,sizeof(dest));
hp = gethostbyname(argv[1]);
if (!hp){
addr = inet_addr(argv[1]);
}
if ((!hp) &&(addr == INADDR_NONE) ) {
fprintf(stderr,"Unable to resolve %s\n",argv[1]);
ExitProcess(STATUS_FAILED);
}
if (hp != NULL)
memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);
else
dest.sin_addr.s_addr = addr;
if (hp)
dest.sin_family = hp->h_addrtype;
else
dest.sin_family = AF_INET;
dest_ip = inet_ntoa(dest.sin_addr);
if (argc >2) {
datasize = atoi(argv[2]);
if (datasize == 0)
datasize = DEF_PACKET_SIZE;
}
else
datasize = DEF_PACKET_SIZE;
datasize += sizeof(IcmpHeader);
icmp_data = xmalloc(MAX_PACKET);
recvbuf = xmalloc(MAX_PACKET);
if (!icmp_data) {
fprintf(stderr,"HeapAlloc failed %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
}
memset(icmp_data,0,MAX_PACKET);
fill_icmp_data(icmp_data,datasize);
while(1) {
int bwrote;
((IcmpHeader*)icmp_data)->i_cksum = 0;
((IcmpHeader*)icmp_data)->timestamp = GetTickCount();
((IcmpHeader*)icmp_data)->i_seq = seq_no++;
((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,
datasize);
bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,
sizeof(dest));
if (bwrote == SOCKET_ERROR){
if (WSAGetLastError() == WSAETIMEDOUT) {
printf("timed out\n");
continue;
}
fprintf(stderr,"sendto failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
if (bwrote fprintf(stdout,"Wrote %d bytes\n",bwrote); } bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from, &fromlen); if (bread == SOCKET_ERROR){ if (WSAGetLastError() == WSAETIMEDOUT) { printf("timed out\n"); continue; } fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } decode_resp(recvbuf,bread,&from); Sleep(1000); } return 0; } /* The response is an IP packet. We must decode the IP header to locate the ICMP data */ void decode_resp(char *buf, int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr = (IpHeader *)buf; iphdrlen = iphdr->h_len * 4 ;// number of 32-bit words *4 = bytes if (bytes printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr)); } icmphdr = (IcmpHeader*)(buf + iphdrlen); if (icmphdr->i_type != ICMP_ECHOREPLY) { fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type); return; } if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) { fprintf(stderr,"someone else's packet!\n"); return ; } printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr)); printf(" icmp_seq = %d. ",icmphdr->i_seq); printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp); printf("\n"); } USHORT checksum(USHORT *buffer, int size) { unsigned long cksum=0; while(size >1) { cksum+=*buffer++; size -=sizeof(USHORT); } if(size ) { cksum += *(UCHAR*)buffer; } cksum = (cksum >> 16) + (cksum &0xffff); cksum += (cksum >>16); return (USHORT)(~cksum); } /* Helper function to fill in various stuff in our ICMP request. */ void fill_icmp_data(char * icmp_data, int datasize){ IcmpHeader *icmp_hdr; char *datapart; icmp_hdr = (IcmpHeader*)icmp_data; icmp_hdr->i_type = ICMP_ECHO; icmp_hdr->i_code = 0; icmp_hdr->i_id = (USHORT)GetCurrentProcessId(); icmp_hdr->i_cksum = 0; icmp_hdr->i_seq = 0; datapart = icmp_data + sizeof(IcmpHeader); // // Place some junk in the buffer. // memset(datapart,'E', datasize - sizeof(IcmpHeader)); }
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