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UUIDGenerator.cpp

//
// UUIDGenerator.cpp
//
// $Id: //poco/1.2/Foundation/src/UUIDGenerator.cpp#1 $
//
// Library: Foundation
// Package: UUID
// Module:  UUID
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/UUIDGenerator.h"
#include "Poco/Thread.h"
#include "Poco/RandomStream.h"
#include "Poco/DigestEngine.h"
#include "Poco/MD5Engine.h"
#include "Poco/SingletonHolder.h"
#include <string.h>


namespace Poco {


UUIDGenerator::UUIDGenerator(): _ticks(0), _haveNode(false)
{
}


00054 UUIDGenerator::~UUIDGenerator()
{
}


00059 UUID UUIDGenerator::create()
{
      FastMutex::ScopedLock lock(_mutex);

      if (!_haveNode)
      {
            getNode();
            _haveNode = true;
      }
      Timestamp::UtcTimeVal tv = timeStamp();
      UInt32 timeLow = UInt32(tv & 0xFFFFFFFF);
      UInt16 timeMid = UInt16((tv >> 32) & 0xFFFF);
      UInt16 timeHiAndVersion = UInt16((tv >> 48) & 0x0FFF) + (UUID::UUID_TIME_BASED << 12);
      UInt16 clockSeq = (UInt16(_random.next() >> 4) & 0x3FFF) | 0x8000;
      return UUID(timeLow, timeMid, timeHiAndVersion, clockSeq, _node);
}


00077 UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name)
{
      MD5Engine md5;
      return createFromName(nsid, name, md5);
}


00084 UUID UUIDGenerator::createFromName(const UUID& nsid, const std::string& name, DigestEngine& de)
{
      poco_assert_dbg (de.digestLength() >= 16);

      UUID netNsid = nsid;
      netNsid.toNetwork();
      de.reset();
      de.update(&netNsid, sizeof(netNsid));
      de.update(name);
      char buffer[16];
      const DigestEngine::Digest& d = de.digest();
      for (int i = 0; i < 16; ++i)
      {
            buffer[i] = d[i];
      }
      return UUID(buffer, UUID::UUID_NAME_BASED);
}

      
00103 UUID UUIDGenerator::createRandom()
{
      char buffer[16];
      RandomInputStream ris;
      ris.read(buffer, sizeof(buffer));
      return UUID(buffer, UUID::UUID_RANDOM);
}


00112 Timestamp::UtcTimeVal UUIDGenerator::timeStamp()
{
      Timestamp now;
      for (;;)
      {
            if (now != _lastTime)
            {
                  _lastTime = now;
                  _ticks = 0;
                  break;
            }
            if (_ticks < 100)
            {
                  ++_ticks;
                  break;
            }
            now.update();
      }
      Timestamp::UtcTimeVal tv = now.utcTime();
      return tv + _ticks;
}


00135 UUID UUIDGenerator::createOne()
{
      try
      {
            return create();
      }
      catch (Exception&)
      {
            return createRandom();
      }
}


00148 UUIDGenerator& UUIDGenerator::defaultGenerator()
{
      static SingletonHolder<UUIDGenerator> sh;
      return *sh.get();
}


} // namespace Poco


//
// platform-specific code below
//


#if defined(POCO_OS_FAMILY_WINDOWS)
//
// Windows
//
#include <windows.h>
#include <iphlpapi.h>


namespace Poco {


void UUIDGenerator::getNode()
{
      PIP_ADAPTER_INFO pAdapterInfo;
      PIP_ADAPTER_INFO pAdapter = 0;
      ULONG len    = sizeof(IP_ADAPTER_INFO);
      pAdapterInfo = reinterpret_cast<IP_ADAPTER_INFO*>(new char[len]);
      // Make an initial call to GetAdaptersInfo to get
      // the necessary size into len
      DWORD rc = GetAdaptersInfo(pAdapterInfo, &len);
      if (rc == ERROR_BUFFER_OVERFLOW) 
      {
            delete [] reinterpret_cast<char*>(pAdapterInfo);
            pAdapterInfo = reinterpret_cast<IP_ADAPTER_INFO*>(new char[len]);
      }
      else if (rc != ERROR_SUCCESS)
      {
            throw SystemException("cannot get network adapter list");
      }
      try
      {
            bool found = false;
            if (GetAdaptersInfo(pAdapterInfo, &len) == NO_ERROR) 
            {
                  pAdapter = pAdapterInfo;
                  while (pAdapter && !found) 
                  {
                        if (pAdapter->Type == MIB_IF_TYPE_ETHERNET && pAdapter->AddressLength == sizeof(_node))
                        {
                              memcpy(_node, pAdapter->Address, pAdapter->AddressLength);
                              found = true;
                        }
                  }
            }
            else throw SystemException("cannot get network adapter list");
            if (!found) throw SystemException("no Ethernet adapter found");
      }
      catch (Exception&)
      {
            delete [] reinterpret_cast<char*>(pAdapterInfo);
            throw;
      }
      delete [] reinterpret_cast<char*>(pAdapterInfo);
}


} // namespace Poco


#elif defined(POCO_OS_FAMILY_BSD) || POCO_OS == POCO_OS_QNX
//
// BSD variants
//
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <net/if_dl.h>


namespace Poco {


void UUIDGenerator::getNode()
{
      struct ifaddrs* ifaphead;
      int rc = getifaddrs(&ifaphead);
      if (rc) throw SystemException("cannot get network adapter list");

      bool foundAdapter = false;
      for (struct ifaddrs* ifap = ifaphead; ifap; ifap = ifap->ifa_next) 
      {
            if (ifap->ifa_addr && ifap->ifa_addr->sa_family == AF_LINK) 
            {
                  struct sockaddr_dl* sdl = reinterpret_cast<struct sockaddr_dl*>(ifap->ifa_addr);
                  caddr_t ap = (caddr_t) (sdl->sdl_data + sdl->sdl_nlen);
                  int alen = sdl->sdl_alen;
                  if (ap && alen > 0) 
                  {
                        memcpy(_node, ap, sizeof(_node));
                        foundAdapter = true;
                        break;
                  }
            }
      }
      freeifaddrs(ifaphead);
      if (!foundAdapter) throw SystemException("cannot determine MAC address (no suitable network adapter found)");
}


} // namespace Poco


#elif defined(__CYGWIN__) || POCO_OS == POCO_OS_LINUX
//
// Linux
//
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <unistd.h>


namespace Poco {


void UUIDGenerator::getNode()
{
      struct ifreq ifr;

      int s = socket(PF_INET, SOCK_DGRAM, 0);
      if (s == -1) throw SystemException("cannot open socket");

      strcpy(ifr.ifr_name, "eth0");
      int rc = ioctl(s, SIOCGIFHWADDR, &ifr);
      close(s);
      if (rc < 0) throw SystemException("cannot get MAC address");
      struct sockaddr* sa = reinterpret_cast<struct sockaddr*>(&ifr.ifr_addr);
      memcpy(_node, sa->sa_data, sizeof(_node));
}


} // namespace Poco


#elif defined(POCO_OS_FAMILY_UNIX) || defined(POCO_OS_FAMILY_VMS)
//
// Unix/VMS
//
#if defined(__VMS)
#include <ioctl.h>
#else
#include <sys/ioctl.h>
#endif
#if defined(sun) || defined(__sun)
#include <sys/sockio.h>
#endif
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <net/if.h>
#if defined(__VMS)
#include <inet.h>
#else
#include <arpa/inet.h>
#endif
#include <netdb.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <unistd.h>


#if defined(__VMS)
#define MAXHOSTNAMELEN 64
#endif


namespace Poco {


void UUIDGenerator::getNode()
{
      char name[MAXHOSTNAMELEN];
      if (gethostname(name, sizeof(name)))
            throw SystemException("cannot get host name");

      struct hostent* pHost = gethostbyname(name);
      if (!pHost) throw SystemException("cannot get host IP address");

      int s = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
      if (s == -1) throw SystemException("cannot open socket");

      struct arpreq ar;
      memset(&ar, 0, sizeof(ar));
      struct sockaddr_in* pAddr = reinterpret_cast<struct sockaddr_in*>(&ar.arp_pa);
      pAddr->sin_family = AF_INET;
      memcpy(&pAddr->sin_addr, *pHost->h_addr_list, sizeof(struct in_addr));
      int rc = ioctl(s, SIOCGARP, &ar);
      close(s);
      if (rc < 0) throw SystemException("cannot get MAC address");
      memcpy(_node, ar.arp_ha.sa_data, sizeof(_node));
}


} // namespace Poco


#endif

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