Environment_VMS.cpp

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//
// Environment_VMS.cpp
//
// $Id: //poco/1.3/Foundation/src/Environment_VMS.cpp#2 $
//
// Library: Foundation
// Package: Core
// Module:  Environment
//
// 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/Environment_VMS.h"
#include "Poco/Exception.h"
#include <stdlib.h>
#include <starlet.h>
#include <descrip.h>
#include <ssdef.h>
#include <syidef.h>
#include <iledef.h>
#include <lnmdef.h>
#include <ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <net/if.h>
#include <inet.h>
#include <netdb.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <unistd.h>


#define MAXHOSTNAMELEN 64


namespace Poco {


FastMutex EnvironmentImpl::_mutex;


std::string EnvironmentImpl::getImpl(const std::string& name)
{
        FastMutex::ScopedLock lock(_mutex);
        
        const char* val = getenv(name.c_str());
        if (val)
                return std::string(val);
        else
                throw NotFoundException(name);
}


bool EnvironmentImpl::hasImpl(const std::string& name)
{
        FastMutex::ScopedLock lock(_mutex);

        return getenv(name.c_str()) != 0;
}


void EnvironmentImpl::setImpl(const std::string& name, const std::string& value)
{
        FastMutex::ScopedLock lock(_mutex);
        
        if (setenv(name.c_str(), value.c_str(), 1))
        {
                std::string msg = "cannot set environment variable: ";
                msg.append(name);
                throw SystemException(msg);
        }
}


std::string EnvironmentImpl::osNameImpl()
{
        return getsyi(SYI$_NODE_SWTYPE);
}


std::string EnvironmentImpl::osVersionImpl()
{
        return getsyi(SYI$_VERSION);
}


std::string EnvironmentImpl::osArchitectureImpl()
{
        return getsyi(SYI$_ARCH_NAME);
}


std::string EnvironmentImpl::nodeNameImpl()
{
        return getsyi(SYI$_NODENAME);
}


void EnvironmentImpl::nodeIdImpl(NodeId& id)
{
        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;
        std::memset(&ar, 0, sizeof(ar));
        struct sockaddr_in* pAddr = reinterpret_cast<struct sockaddr_in*>(&ar.arp_pa);
        pAddr->sin_family = AF_INET;
        std::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");
        std::memcpy(&id, ar.arp_ha.sa_data, sizeof(id));
}


std::string EnvironmentImpl::getsyi(unsigned short code)
{
        #pragma pointer_size save
        #pragma pointer_size 32

        unsigned char result[16];
        unsigned short length;

        ILE3 items[2];
        items[0].ile3$w_code         = code;
        items[0].ile3$w_length       = sizeof(result);
        items[0].ile3$ps_bufaddr     = result;
        items[0].ile3$ps_retlen_addr = &length;
        items[1].ile3$w_code         = 0;
        items[1].ile3$w_length       = 0;

        if (sys$getsyiw(0, 0, 0, items, 0, 0, 0) == 1)
                return std::string((char*) result, length);
        else
                throw SystemException("$GETSYI failed");

        #pragma pointer_size restore
}


std::string EnvironmentImpl::trnlnm(const std::string& name)
{
        #pragma pointer_size save
        #pragma pointer_size 32

        unsigned char result[LNM$C_NAMLENGTH];
        unsigned short length;
        
        ILE3 items[2];
        items[0].ile3$w_code         = LNM$_STRING;
        items[0].ile3$w_length       = sizeof(result);
        items[0].ile3$ps_bufaddr     = result;
        items[0].ile3$ps_retlen_addr = &length;
        items[1].ile3$w_code         = 0;
        items[1].ile3$w_length       = 0;

        #pragma pointer_size restore

        unsigned int trnAttr = LNM$M_CASE_BLIND;
        POCO_DESCRIPTOR_LITERAL(tableDsc, "LNM$FILE_DEV");
        POCO_DESCRIPTOR_STRING(nameDsc, name);
        if (sys$trnlnm(&trnAttr, &tableDsc, &nameDsc, 0, &items) == 1)
        {
                if (result[0] == 0x1B)
                        return std::string((char*) result + 4, length - 4);
                else
                        return std::string((char*) result, length);
        }
        else
        {
                return std::string();
        }
}


} // namespace Poco