(Help needed)Getting error in ping program

• • Reply

  14 years ago

  by nisha.singh

  Nishant

  , Australia

  Joined 14 years ago

  Hi,

    Plz give some suggestion why I am getting this compile time error in this ping code.(Error msgs I have pasted below) I m new to C .....Thanks in advance:-

  // PING.C -- Ping program using ICMP and RAW Sockets
  //
  

  #include <stdio.h>
  #include <stdlib.h>
  #include <winsock.h>
  
  #include "Ping.h"
  
  
  
  

  // Internal Functions

  
  void Ping(LPCSTR pstrHost);
  void ReportError(LPCSTR pstrFrom);
  int  WaitForEchoReply(SOCKET s);
  u_short in_cksum(u_short *addr, int len);
  
  
  
  

  // ICMP Echo Request/Reply functions

  
  int  SendEchoRequest(SOCKET, LPSOCKADDR_IN);
  DWORD RecvEchoReply(SOCKET, LPSOCKADDR_IN, u_char *);
  
  

  
  // main()
  void main(int argc, char **argv)
  {
      WSADATA wsaData;
      WORD wVersionRequested = MAKEWORD(1,1);
      int nRet;
  
  
  
  
  
  

   // Check arguments
      if (argc != 2)
      {
    fprintf(stderr,"\nUsage: ping hostname\n");
    return;
      }
  
  
  
  
  

   // Init WinSock
   /*
      nRet = WSAStartup(wVersionRequested, &wsaData);
      if (nRet)
      {
    fprintf(stderr,"\nError initializing WinSock\n");
    return;
      }*/
  
  
  
  
  
  
  

   // Check version
   if (wsaData.wVersion != wVersionRequested)
   {
    fprintf(stderr,"\nWinSock version not supported\n");
    return;
   }
  
  
  
  
  

   // Go do the ping
   Ping(argv[1]);
  

   // Free WinSock
      //WSACleanup();
  }
  
  

  
  // Ping()
  // Calls SendEchoRequest() and
  // RecvEchoReply() and prints results
  void Ping(LPCSTR pstrHost)
  {
   SOCKET   rawSocket;
   LPHOSTENT lpHost;
   struct    sockaddr_in saDest;
   struct    sockaddr_in saSrc;
   DWORD   dwTimeSent;
   DWORD   dwElapsed;
   u_char    cTTL;
   int       nLoop;
   int       nRet;
  
  
  
  
  
  
  
  
  
  
  
  
  
  

   // Create a Raw socket
   rawSocket = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
   if (rawSocket == SOCKET_ERROR)
   {
    ReportError("socket()");
    return;
   }
   
   // Lookup host
   lpHost = gethostbyname(pstrHost);
   if (lpHost == NULL)
   {
    fprintf(stderr,"\nHost not found: %s\n", pstrHost);
    return;
   }
   
   // Setup destination socket address
   saDest.sin_addr.s_addr = *((u_long FAR *) (lpHost->h_addr));
   saDest.sin_family = AF_INET;
   saDest.sin_port = 0;
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  

   // Tell the user what we're doing
   printf("\nPinging %s [%s] with %d bytes of data:\n",
      pstrHost,
      inet_ntoa(saDest.sin_addr),
      REQ_DATASIZE);
  
  
  
  

   // Ping multiple times
   for (nLoop = 0; nLoop < 4; nLoop++)
   {
    // Send ICMP echo request
    SendEchoRequest(rawSocket, &saDest);
  
  
  
  

    // Use select() to wait for data to be received
    nRet = WaitForEchoReply(rawSocket);
    if (nRet == SOCKET_ERROR)
    {
     ReportError("select()");
     break;
    }
    if (!nRet)
    {
     printf("\nTimeOut");
     break;
    }
  
  
  
  
  
  
  
  
  
  
  

    // Receive reply
    dwTimeSent = RecvEchoReply(rawSocket, &saSrc, &cTTL);
  

    // Calculate elapsed time
    dwElapsed = GetTickCount() - dwTimeSent;
    printf("\nReply from: %s: bytes=%d time=%ldms TTL=%d",
                 inet_ntoa(saSrc.sin_addr),
        REQ_DATASIZE,
                 dwElapsed,
                 cTTL);
   }
   printf("\n");
   nRet = closesocket(rawSocket);
   if (nRet == SOCKET_ERROR)
    ReportError("closesocket()");
  }
  
  
  
  
  
  
  
  
  
  
  
  

  
  // SendEchoRequest()
  // Fill in echo request header
  // and send to destination
  int SendEchoRequest(SOCKET s,LPSOCKADDR_IN lpstToAddr)
  {
   static ECHOREQUEST echoReq;
   static nId = 1;
   static nSeq = 1;
   int nRet;
  
  
  
  
  
  
  
  
  

   // Fill in echo request
   echoReq.icmpHdr.Type  = ICMP_ECHOREQ;
   echoReq.icmpHdr.Code  = 0;
   echoReq.icmpHdr.Checksum = 0;
   echoReq.icmpHdr.ID   = nId++;
   echoReq.icmpHdr.Seq   = nSeq++;
  
  
  
  
  

   // Fill in some data to send
   for (nRet = 0; nRet < REQ_DATASIZE; nRet++)
    echoReq.cData[nRet] = ' '+nRet;
  
  

   // Save tick count when sent
   echoReq.dwTime    = GetTickCount();
  

   // Put data in packet and compute checksum
   echoReq.icmpHdr.Checksum = in_cksum((u_short *)&echoReq, sizeof(ECHOREQUEST));
  

   // Send the echo request           
   nRet = sendto(s,      /* socket */
       (LPSTR)&echoReq,   /* buffer */
       sizeof(ECHOREQUEST),
       0,       /* flags */
       (LPSOCKADDR)lpstToAddr, /* destination */
       sizeof(SOCKADDR_IN));   /* address length */
  
  
  
  
  
  

   if (nRet == SOCKET_ERROR)
    ReportError("sendto()");
   return (nRet);
  }
  
  
  

  
  // RecvEchoReply()
  // Receive incoming data
  // and parse out fields
  DWORD RecvEchoReply(SOCKET s, LPSOCKADDR_IN lpsaFrom, u_char *pTTL)
  {
   ECHOREPLY echoReply;
   int nRet;
   int nAddrLen = sizeof(struct sockaddr_in);
  
  
  
  
  
  
  
  

   // Receive the echo reply 
   nRet = recvfrom(s,     // socket
       (LPSTR)&echoReply, // buffer
       sizeof(ECHOREPLY), // size of buffer
       0,     // flags
       (LPSOCKADDR)lpsaFrom, // From address
       &nAddrLen);   // pointer to address len
  
  
  
  
  
  

   // Check return value
   if (nRet == SOCKET_ERROR)
    ReportError("recvfrom()");
  
  

   // return time sent and IP TTL
   *pTTL = echoReply.ipHdr.TTL;
   return(echoReply.echoRequest.dwTime);     
  }
  
  
  

  // What happened?
  void ReportError(LPCSTR pWhere)
  {
   fprintf(stderr,"\n%s error: %d\n",
    WSAGetLastError());
  }
  
  
  
  
  

  
  // WaitForEchoReply()
  // Use select() to determine when
  // data is waiting to be read
  int WaitForEchoReply(SOCKET s)
  {
   struct timeval Timeout;
   fd_set readfds;
  
  
  
  
  
  
  

   readfds.fd_count = 1;
   readfds.fd_array[0] = s;
   Timeout.tv_sec = 5;
      Timeout.tv_usec = 0;
  
  
  

   return(select(1, &readfds, NULL, NULL, &Timeout));
  }
  

  
  //
  // Mike Muuss' in_cksum() function
  // and his comments from the original
  // ping program
  //
  // * Author -
  // * Mike Muuss
  // * U. S. Army Ballistic Research Laboratory
  // * December, 1983
  
  
  
  
  
  
  
  
  

  /*
   *   I N _ C K S U M
   *
   * Checksum routine for Internet Protocol family headers (C Version)
   *
   */
  u_short in_cksum(u_short *addr, int len)
  {
   register int nleft = len;
   register u_short *w = addr;
   register u_short answer;
   register int sum = 0;
  
  
  
  
  
  
  
  
  
  
  

   /*
    *  Our algorithm is simple, using a 32 bit accumulator (sum),
    *  we add sequential 16 bit words to it, and at the end, fold
    *  back all the carry bits from the top 16 bits into the lower
    *  16 bits.
    */
   while( nleft > 1 )  {
    sum += *w++;
    nleft -= 2;
   }
  
  
  
  
  
  
  
  
  

   /* mop up an odd byte, if necessary */
   if( nleft == 1 ) {
    u_short u = 0;
  
  

    *(u_char *)(&u) = *(u_char *)w ;
    sum += u;
   }
  
  

   /*
    * add back carry outs from top 16 bits to low 16 bits
    */
   sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
   sum += (sum >> 16);   /* add carry */
   answer = ~sum;    /* truncate to 16 bits */
   return (answer);
  }
  
  
  
  
  
  
  
  
  

  ///////////////////// errors are

  Ping.obj : error LNK2001: unresolved external symbol _WSACleanup@0
  Ping.obj : error LNK2001: unresolved external symbol _WSAStartup@8
  Ping.obj : error LNK2001: unresolved external symbol _closesocket@4
  Ping.obj : error LNK2001: unresolved external symbol _inet_ntoa@4
  Ping.obj : error LNK2001: unresolved external symbol _gethostbyname@4
  Ping.obj : error LNK2001: unresolved external symbol _socket@12
  Ping.obj : error LNK2001: unresolved external symbol _sendto@24
  Ping.obj : error LNK2001: unresolved external symbol _recvfrom@24
  Ping.obj : error LNK2001: unresolved external symbol _WSAGetLastError@0
  Ping.obj : error LNK2001: unresolved external symbol _select@20
  LIBCD.lib(wincrt0.obj) : error LNK2001: unresolved external symbol _WinMain@16
  Debug/AnotherCPing.exe : fatal error LNK1120: 11 unresolved externals
  Error executing link.exe.
  
  
  
  
  
  
  
  
  
  
  
  

   

  ///Header file Ping.h is

  // Ping.h
  //
  

  #pragma pack(1)

  #define ICMP_ECHOREPLY 0
  #define ICMP_ECHOREQ 8
  

  // IP Header -- RFC 791
  typedef struct tagIPHDR
  {
   u_char  VIHL;   // Version and IHL
   u_char TOS;   // Type Of Service
   short TotLen;   // Total Length
   short ID;    // Identification
   short FlagOff;  // Flags and Fragment Offset
   u_char TTL;   // Time To Live
   u_char Protocol;  // Protocol
   u_short Checksum;  // Checksum
   struct in_addr iaSrc; // Internet Address - Source
   struct in_addr iaDst; // Internet Address - Destination
  }IPHDR, *PIPHDR;
  
  
  
  
  
  
  
  
  
  
  
  
  

  
  // ICMP Header - RFC 792
  typedef struct tagICMPHDR
  {
   u_char Type;   // Type
   u_char Code;   // Code
   u_short Checksum;  // Checksum
   u_short ID;    // Identification
   u_short Seq;   // Sequence
   char Data;   // Data
  }ICMPHDR, *PICMPHDR;
  
  
  
  
  
  
  
  
  
  

  
  #define REQ_DATASIZE 32  // Echo Request Data size
  

  // ICMP Echo Request
  typedef struct tagECHOREQUEST
  {
   ICMPHDR icmpHdr;
   DWORD dwTime;
   char cData[REQ_DATASIZE];
  }ECHOREQUEST, *PECHOREQUEST;
  
  
  
  
  
  

  
  // ICMP Echo Reply
  typedef struct tagECHOREPLY
  {
   IPHDR ipHdr;
   ECHOREQUEST echoRequest;
   char    cFiller[256];
  }ECHOREPLY, *PECHOREPLY;
  
  
  
  
  
  
  

  
  #pragma pack()
  

   

   

   

  Report abuse