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Ping的原代码 网络安全者必看
2008-04-22   

 

  #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;
  #p#副标题#e#
  }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 1Kbn");
  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: %dn",GetLastError());
  ExitProcess(STATUS_FAILED);
  }
  
  if (argc <2 ) {
  Usage(argv[0]);
  }
  sockRaw = WSASocket (AF_INET,
  SOCK_RAW,
  IPPROTO_ICMP,
  NULL, 0,0);
  #p#副标题#e#
  if (sockRaw == INVALID_SOCKET) {
  fprintf(stderr,"WSASocket() failed: %dn",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: %dn",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: %dn",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 %sn",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 %dn",GetLastError());
  ExitProcess(STATUS_FAILED);
  }
  
  
  memset(icmp_data,0,MAX_PACKET);
  fill_icmp_data(icmp_data,datasize);
  
  while(1) {
  int bwrote;
  #p#副标题#e#
  ((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 outn");
  continue;
  }
  fprintf(stderr,"sendto failed: %dn",WSAGetLastError());
  ExitProcess(STATUS_FAILED);
  }
  if (bwrote < datasize ) {
  fprintf(stdout,"Wrote %d bytesn",bwrote);
  }
  bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,
  &fromlen);
  if (bread == SOCKET_ERROR){
  if (WSAGetLastError() == WSAETIMEDOUT) {
  printf("timed outn");
  continue;
  }
  fprintf(stderr,"recvfrom failed: %dn",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 < iphdrlen + ICMP_MIN) {
  printf("Too few bytes from %sn",inet_ntoa(from->sin_addr));
  }
  
  icmphdr = (IcmpHeader*)(buf + iphdrlen);
  
  if (icmphdr->i_type != ICMP_ECHOREPLY) {
  fprintf(stderr,"non-echo type %d recvdn",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");
  
  }
  #p#副标题#e#
  
  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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