vpr::sim::DNS Class Reference

Do lookups on addresses, giving results for each unique query. More...

#include <vpr/md/SIM/DNS.h>

Inheritance diagram for vpr::sim::DNS:

[legend]Collaboration diagram for vpr::sim::DNS:

[legend]List of all members.

Public Member Functions
	DNS ()
vpr::Uint32	lookupAddress (const std::string &addr)
	Given an Internet name or dotted-decimal address, this returns the IP address in network byte order.
Protected Attributes
std::map< std::string, vpr::Uint32 >	mDnsAddressLookup
	Use this to look up an address from a name.
vpr::Uint32	mUniqueGenerator

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Detailed Description

Do lookups on addresses, giving results for each unique query.

Definition at line 64 of file DNS.h.

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Constructor & Destructor Documentation

vpr::sim::DNS::DNS

(

)

[inline]

Definition at line 67 of file DNS.h.

            : mUniqueGenerator(0)
      {
         mDnsAddressLookup["localhost"] = 0x7F000001;
      }

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Member Function Documentation

vpr::Uint32 vpr::sim::DNS::lookupAddress

(

const std::string &

addr

)

Given an Internet name or dotted-decimal address, this returns the IP address in network byte order.

Definition at line 57 of file DNS.cpp.

References mDnsAddressLookup, mUniqueGenerator, and vpr::SystemPosix::Ntohl().

{
   vpr::Uint32 found_addr;

   // if name is found in lookup, return the address
   if ( mDnsAddressLookup.count(addr_str) > 0 )
   {
      found_addr = mDnsAddressLookup[addr_str];
   }
   // if not found, then make an entry for the new address.
   else
   {
      union
      {
         vpr::Uint8 bytes[4];
         vpr::Uint32 value;
      } addr;
      int retval;

      vpr::Uint32 temp1, temp2, temp3, temp4;
      retval = sscanf(addr_str.c_str(), "%3u.%3u.%3u.%3u", &temp1, &temp2,
                      &temp3, &temp4);
      addr.bytes[0] = (vpr::Uint8) temp1;
      addr.bytes[1] = (vpr::Uint8) temp2;
      addr.bytes[2] = (vpr::Uint8) temp3;
      addr.bytes[3] = (vpr::Uint8) temp4;

      if ( retval == 4 )
      {
         found_addr = vpr::System::Ntohl(addr.value);
      }
      else
      {
         found_addr = mUniqueGenerator++;
      }

      mDnsAddressLookup[addr_str] = found_addr;
   }

   return found_addr;
}

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Member Data Documentation

std::map< std::string, vpr::Uint32 > vpr::sim::DNS::mDnsAddressLookup [protected]

Use this to look up an address from a name.

Definition at line 81 of file DNS.h.

Referenced by lookupAddress().

vpr::Uint32 vpr::sim::DNS::mUniqueGenerator [protected]

Definition at line 83 of file DNS.h.

Referenced by lookupAddress().

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The documentation for this class was generated from the following files:

• DNS.h
• DNS.cpp

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