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RE: Win32 port
From: "Heine, Matthew" <mheine () harris com>
Date: Wed, 27 Feb 2002 09:29:02 -0500

Actual diff on that patch is as follows for those wondering what changed...
==========================================================
107c107
< 
---
              
110a111

113c114
<       //      Note: I could use SO_RCVTIMEO but I don't trust it...
---
      // Note: I could use SO_RCVTIMEO but I don't trust it...
119c120,126
<       if(0 == select(0, &fds, 0, 0, &tv)) return 0;
---
      if(0 == select(0, &fds, 0, 0, &tv))
      {
              if(len) *len = 0;
              return 0;
      }


122a130

146c154,155
< 
---
              
              
==========================================================


-----Original Message-----
From: KevinĀ³ Davis [mailto:kevin.davis () mindless com]
Sent: Wednesday, February 27, 2002 6:29 AM
To: Stou Sandalski; 'Paul Ellison'; nmap-dev () insecure org
Subject: Re: Win32 port


A while back I posted a problem I had with nmap crashing on Windows boxes -
sometimes.  Andy Lutomirski posted a patch that fixed things for me.
Hopefully this has made it into the developer's hands and will be
implemented in the next release.  See below for the fix:




Change readip_rawrecv in rawrecv.c to this:

char *rawrecv_readip(pcap_t *pd, unsigned int *len, long to_usec)
{
 int rcvlen;
 DWORD time1, time2;
 fd_set fds;
 TIMEVAL tv;

 if(-2 != (long)pd)
  fatal("rawrecv_readip: called with non-rawrecv handle\n");

begin:

 // Note: I could use SO_RCVTIMEO but I don't trust it...
 time1 = GetTickCount();
 FD_ZERO(&fds);
 FD_SET(s, &fds);
 tv.tv_usec = to_usec % 1000000;
 tv.tv_sec = to_usec / 1000000;
 if(0 == select(0, &fds, 0, 0, &tv))
 {
  if(len) *len = 0;
  return 0;
 }

 rcvlen = recv(s, buf, sizeof(buf), 0);
 time2 = GetTickCount() + 10;

 if(rcvlen > 0)
 {
  if(rcvlen >= sizeof(struct ip) && filter(buf, rcvlen))
  {
   if(len) *len = rcvlen;
   return buf;
  }
  else
  {
   to_usec -= 1000 * (time2 - time1);
   if(to_usec < 0)
   {
    if(len) *len = 0;
    return 0;
   }
   goto begin;
  }
 }
 else
 {
  DWORD err = WSAGetLastError();
  if(err != WSAETIMEDOUT && err != WSAEWOULDBLOCK)
   fatal("rawrecv: recv failed (%lu)\n", err);

  if(len) *len = 0;
  return 0;
 }
}


---------------------------------------
KevinĀ³ Davis

What could possibly go wrong?

kevin.davis () mindless com

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