root/trunk/dep/src/sockets/Utility.cpp @ 67

/** \file Utility.cpp
 **     \date  2004-02-13
 **     \author grymse@alhem.net
**/
/*
Copyright (C) 2004-2007  Anders Hedstrom

This library is made available under the terms of the GNU GPL.

If you would like to use this library in a closed-source application,
a separate license agreement is available. For information about 
the closed-source license agreement for the C++ sockets library,
please visit http://www.alhem.net/Sockets/license.html and/or
email license@alhem.net.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
#include "Utility.h"
#include "Parse.h"
#include "Ipv4Address.h"
#include "Ipv6Address.h"
#include "Base64.h"
#include <vector>
#ifdef _WIN32
#include <time.h>
#else
#include <netdb.h>
#include <pthread.h>
#endif
#include <map>

#ifdef SOCKETS_NAMESPACE
namespace SOCKETS_NAMESPACE {
#endif


// defines for the random number generator
#define TWIST_IA        397
#define TWIST_IB       (TWIST_LEN - TWIST_IA)
#define UMASK           0x80000000
#define LMASK           0x7FFFFFFF
#define MATRIX_A        0x9908B0DF
#define TWIST(b,i,j)   ((b)[i] & UMASK) | ((b)[j] & LMASK)
#define MAGIC_TWIST(s) (((s) & 1) * MATRIX_A)


// statics
std::string Utility::m_host;
bool Utility::m_local_resolved = false;
ipaddr_t Utility::m_ip = 0;
std::string Utility::m_addr;
#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
struct in6_addr Utility::m_local_ip6;
std::string Utility::m_local_addr6;
#endif
#endif


std::string Utility::base64(const std::string& str_in)
{
        std::string str;
        Base64 m_b;
        m_b.encode(str_in, str, false); // , false == do not add cr/lf
        return str;
}


std::string Utility::base64d(const std::string& str_in)
{
        std::string str;
        Base64 m_b;
        m_b.decode(str_in, str);
        return str;
}


std::string Utility::l2string(long l)
{
        std::string str;
        char tmp[100];
        sprintf(tmp,"%ld",l);
        str = tmp;
        return str;
}


std::string Utility::bigint2string(uint64_t l)
{
        std::string str;
        uint64_t tmp = l;
        while (tmp)
        {
                uint64_t a = tmp % 10;
                str = (char)(a + 48) + str;
                tmp /= 10;
        }
        if (str.empty())
        {
                str = "0";
        }
        return str;
}


uint64_t Utility::atoi64(const std::string& str) 
{
        uint64_t l = 0;
        for (size_t i = 0; i < str.size(); i++)
        {
                l = l * 10 + str[i] - 48;
        }
        return l;
}


unsigned int Utility::hex2unsigned(const std::string& str)
{
        unsigned int r = 0;
        for (size_t i = 0; i < str.size(); i++)
        {
                r = r * 16 + str[i] - 48 - ((str[i] >= 'A') ? 7 : 0) - ((str[i] >= 'a') ? 32 : 0);
        }
        return r;
}


/*
* Encode string per RFC1738 URL encoding rules
* tnx rstaveley
*/
std::string Utility::rfc1738_encode(const std::string& src)
{
static  char hex[] = "0123456789ABCDEF";
        std::string dst;
        for (size_t i = 0; i < src.size(); i++)
        {
                if (isalnum(src[i]))
                {
                        dst += src[i];
                }
                else
                if (src[i] == ' ')
                {
                        dst += '+';
                }
                else
                {
                        unsigned char c = static_cast<unsigned char>(src[i]);
                        dst += '%';
                        dst += hex[c / 16];
                        dst += hex[c % 16];
                }
        }
        return dst;
} // rfc1738_encode


/*
* Decode string per RFC1738 URL encoding rules
* tnx rstaveley
*/
std::string Utility::rfc1738_decode(const std::string& src)
{
        std::string dst;
        for (size_t i = 0; i < src.size(); i++)
        {
                if (src[i] == '%' && isxdigit(src[i + 1]) && isxdigit(src[i + 2]))
                {
                        char c1 = src[++i];
                        char c2 = src[++i];
                        c1 = c1 - 48 - ((c1 >= 'A') ? 7 : 0) - ((c1 >= 'a') ? 32 : 0);
                        c2 = c2 - 48 - ((c2 >= 'A') ? 7 : 0) - ((c2 >= 'a') ? 32 : 0);
                        dst += (char)(c1 * 16 + c2);
                }
                else
                if (src[i] == '+')
                {
                        dst += ' ';
                }
                else
                {
                        dst += src[i];
                }
        }
        return dst;
} // rfc1738_decode


bool Utility::isipv4(const std::string& str)
{
        int dots = 0;
        // %! ignore :port?
        for (size_t i = 0; i < str.size(); i++)
        {
                if (str[i] == '.')
                        dots++;
                else
                if (!isdigit(str[i]))
                        return false;
        }
        if (dots != 3)
                return false;
        return true;
}


bool Utility::isipv6(const std::string& str)
{
        size_t qc = 0;
        size_t qd = 0;
        for (size_t i = 0; i < str.size(); i++)
        {
                qc += (str[i] == ':') ? 1 : 0;
                qd += (str[i] == '.') ? 1 : 0;
        }
        if (qc > 7)
        {
                return false;
        }
        if (qd && qd != 3)
        {
                return false;
        }
        Parse pa(str,":.");
        std::string tmp = pa.getword();
        while (!tmp.empty())
        {
                if (tmp.size() > 4)
                {
                        return false;
                }
                for (size_t i = 0; i < tmp.size(); i++)
                {
                        if (tmp[i] < '0' || (tmp[i] > '9' && tmp[i] < 'A') ||
                                (tmp[i] > 'F' && tmp[i] < 'a') || tmp[i] > 'f')
                        {
                                return false;
                        }
                }
                //
                tmp = pa.getword();
        }
        return true;
}


bool Utility::u2ip(const std::string& str, ipaddr_t& l)
{
        struct sockaddr_in sa;
        bool r = Utility::u2ip(str, sa);
        memcpy(&l, &sa.sin_addr, sizeof(l));
        return r;
}


#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
bool Utility::u2ip(const std::string& str, struct in6_addr& l)
{
        struct sockaddr_in6 sa;
        bool r = Utility::u2ip(str, sa);
        l = sa.sin6_addr;
        return r;
}
#endif
#endif


void Utility::l2ip(const ipaddr_t ip, std::string& str)
{
        struct sockaddr_in sa;
        memset(&sa, 0, sizeof(sa));
        sa.sin_family = AF_INET;
        memcpy(&sa.sin_addr, &ip, sizeof(sa.sin_addr));
        Utility::reverse( (struct sockaddr *)&sa, sizeof(sa), str, NI_NUMERICHOST);
}


void Utility::l2ip(const in_addr& ip, std::string& str)
{
        struct sockaddr_in sa;
        memset(&sa, 0, sizeof(sa));
        sa.sin_family = AF_INET;
        sa.sin_addr = ip;
        Utility::reverse( (struct sockaddr *)&sa, sizeof(sa), str, NI_NUMERICHOST);
}


#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
void Utility::l2ip(const struct in6_addr& ip, std::string& str,bool mixed)
{
        char slask[100]; // l2ip temporary
        *slask = 0;
        unsigned int prev = 0;
        bool skipped = false;
        bool ok_to_skip = true;
        if (mixed)
        {
                unsigned short x;
                unsigned short addr16[8];
                memcpy(addr16, &ip, sizeof(addr16));
                for (size_t i = 0; i < 6; i++)
                {
                        x = ntohs(addr16[i]);
                        if (*slask && (x || !ok_to_skip || prev))
                                strcat(slask,":");
                        if (x || !ok_to_skip)
                        {
                                sprintf(slask + strlen(slask),"%x", x);
                                if (x && skipped)
                                        ok_to_skip = false;
                        }
                        else
                        {
                                skipped = true;
                        }
                        prev = x;
                }
                x = ntohs(addr16[6]);
                sprintf(slask + strlen(slask),":%u.%u",x / 256,x & 255);
                x = ntohs(addr16[7]);
                sprintf(slask + strlen(slask),".%u.%u",x / 256,x & 255);
        }
        else
        {
                struct sockaddr_in6 sa;
                memset(&sa, 0, sizeof(sa));
                sa.sin6_family = AF_INET6;
                sa.sin6_addr = ip;
                Utility::reverse( (struct sockaddr *)&sa, sizeof(sa), str, NI_NUMERICHOST);
                return;
        }
        str = slask;
}


int Utility::in6_addr_compare(in6_addr a,in6_addr b)
{
        for (size_t i = 0; i < 16; i++)
        {
                if (a.s6_addr[i] < b.s6_addr[i])
                        return -1;
                if (a.s6_addr[i] > b.s6_addr[i])
                        return 1;
        }
        return 0;
}
#endif
#endif


void Utility::ResolveLocal()
{
        char h[256];

        // get local hostname and translate into ip-address
        *h = 0;
        gethostname(h,255);
        {
                if (Utility::u2ip(h, m_ip))
                {
                        Utility::l2ip(m_ip, m_addr);
                }
        }
#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
        memset(&m_local_ip6, 0, sizeof(m_local_ip6));
        {
                if (Utility::u2ip(h, m_local_ip6))
                {
                        Utility::l2ip(m_local_ip6, m_local_addr6);
                }
        }
#endif
#endif
        m_host = h;
        m_local_resolved = true;
}


const std::string& Utility::GetLocalHostname()
{
        if (!m_local_resolved)
        {
                ResolveLocal();
        }
        return m_host;
}


ipaddr_t Utility::GetLocalIP()
{
        if (!m_local_resolved)
        {
                ResolveLocal();
        }
        return m_ip;
}


const std::string& Utility::GetLocalAddress()
{
        if (!m_local_resolved)
        {
                ResolveLocal();
        }
        return m_addr;
}


#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
const struct in6_addr& Utility::GetLocalIP6()
{
        if (!m_local_resolved)
        {
                ResolveLocal();
        }
        return m_local_ip6;
}


const std::string& Utility::GetLocalAddress6()
{
        if (!m_local_resolved)
        {
                ResolveLocal();
        }
        return m_local_addr6;
}
#endif
#endif


void Utility::SetEnv(const std::string& var,const std::string& value)
{
#if (defined(SOLARIS8) || defined(SOLARIS))
        {
                static std::map<std::string, char *> vmap;
                if (vmap.find(var) != vmap.end())
                {
                        delete[] vmap[var];
                }
                vmap[var] = new char[var.size() + 1 + value.size() + 1];
                sprintf(vmap[var], "%s=%s", var.c_str(), value.c_str());
                putenv( vmap[var] );
        }
#elif defined _WIN32
        {
                std::string slask = var + "=" + value;
                _putenv( (char *)slask.c_str());
        }
#else
        setenv(var.c_str(), value.c_str(), 1);
#endif
}


std::string Utility::Sa2String(struct sockaddr *sa)
{
#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
        if (sa -> sa_family == AF_INET6)
        {
                struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
                std::string tmp;
                Utility::l2ip(sa6 -> sin6_addr, tmp);
                return tmp + ":" + Utility::l2string(ntohs(sa6 -> sin6_port));
        }
#endif
#endif
        if (sa -> sa_family == AF_INET)
        {
                struct sockaddr_in *sa4 = (struct sockaddr_in *)sa;
                ipaddr_t a;
                memcpy(&a, &sa4 -> sin_addr, 4);
                std::string tmp;
                Utility::l2ip(a, tmp);
                return tmp + ":" + Utility::l2string(ntohs(sa4 -> sin_port));
        }
        return "";
}


void Utility::GetTime(struct timeval *p)
{
#ifdef _WIN32
        FILETIME ft; // Contains a 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 (UTC).
        GetSystemTimeAsFileTime(&ft);
        uint64_t tt;
        memcpy(&tt, &ft, sizeof(tt));
        tt /= 10; // make it usecs
        p->tv_sec = (long)tt / 1000000;
        p->tv_usec = (long)tt % 1000000;
#else
        gettimeofday(p, NULL);
#endif
}


std::auto_ptr<SocketAddress> Utility::CreateAddress(struct sockaddr *sa,socklen_t sa_len)
{
        switch (sa -> sa_family)
        {
        case AF_INET:
                if (sa_len == sizeof(struct sockaddr_in))
                {
                        struct sockaddr_in *p = (struct sockaddr_in *)sa;
                        return std::auto_ptr<SocketAddress>(new Ipv4Address(*p));
                }
                break;
#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
        case AF_INET6:
                if (sa_len == sizeof(struct sockaddr_in6))
                {
                        struct sockaddr_in6 *p = (struct sockaddr_in6 *)sa;
                        return std::auto_ptr<SocketAddress>(new Ipv6Address(*p));
                }
                break;
#endif
#endif
        }
        return std::auto_ptr<SocketAddress>(NULL);
}


bool Utility::u2ip(const std::string& host, struct sockaddr_in& sa, int ai_flags)
{
        memset(&sa, 0, sizeof(sa));
        sa.sin_family = AF_INET;
#ifdef NO_GETADDRINFO
        if ((ai_flags & AI_NUMERICHOST) != 0 || isipv4(host))
        {
                Parse pa((char *)host.c_str(), ".");
                union {
                        struct {
                                unsigned char b1;
                                unsigned char b2;
                                unsigned char b3;
                                unsigned char b4;
                        } a;
                        ipaddr_t l;
                } u;
                u.a.b1 = static_cast<unsigned char>(pa.getvalue());
                u.a.b2 = static_cast<unsigned char>(pa.getvalue());
                u.a.b3 = static_cast<unsigned char>(pa.getvalue());
                u.a.b4 = static_cast<unsigned char>(pa.getvalue());
                memcpy(&sa.sin_addr, &u.l, sizeof(sa.sin_addr));
                return true;
        }
#ifndef LINUX
        struct hostent *he = gethostbyname( host.c_str() );
        if (!he)
        {
                return false;
        }
        memcpy(&sa.sin_addr, he -> h_addr, sizeof(sa.sin_addr));
#else
        struct hostent he;
        struct hostent *result = NULL;
        int myerrno = 0;
        char buf[2000];
        int n = gethostbyname_r(host.c_str(), &he, buf, sizeof(buf), &result, &myerrno);
        if (n || !result)
        {
                return false;
        }
        if (he.h_addr_list && he.h_addr_list[0])
                memcpy(&sa.sin_addr, he.h_addr, 4);
        else
                return false;
#endif
        return true;
#else
        struct addrinfo hints;
        memset(&hints, 0, sizeof(hints));
        // AI_NUMERICHOST
        // AI_CANONNAME
        // AI_PASSIVE - server
        // AI_ADDRCONFIG
        // AI_V4MAPPED
        // AI_ALL
        // AI_NUMERICSERV
        hints.ai_flags = ai_flags;
        hints.ai_family = AF_INET;
        hints.ai_socktype = 0;
        hints.ai_protocol = 0;
        struct addrinfo *res;
        if (Utility::isipv4(host))
                hints.ai_flags |= AI_NUMERICHOST;
        int n = getaddrinfo(host.c_str(), NULL, &hints, &res);
        if (!n)
        {
                std::vector<struct addrinfo *> vec;
                struct addrinfo *ai = res;
                while (ai)
                {
                        if (ai -> ai_addrlen == sizeof(sa))
                                vec.push_back( ai );
                        ai = ai -> ai_next;
                }
                if (vec.empty())
                        return false;
                ai = vec[Utility::Rnd() % vec.size()];
                {
                        memcpy(&sa, ai -> ai_addr, ai -> ai_addrlen);
                }
                freeaddrinfo(res);
                return true;
        }
        std::string error = "Error: ";
#ifndef __CYGWIN__
        error += gai_strerror(n);
#endif
        return false;
#endif // NO_GETADDRINFO
}


#ifdef ENABLE_IPV6
#ifdef IPPROTO_IPV6
bool Utility::u2ip(const std::string& host, struct sockaddr_in6& sa, int ai_flags)
{
        memset(&sa, 0, sizeof(sa));
        sa.sin6_family = AF_INET6;
#ifdef NO_GETADDRINFO
        if ((ai_flags & AI_NUMERICHOST) != 0 || isipv6(host))
        {
                std::list<std::string> vec;
                size_t x = 0;
                for (size_t i = 0; i <= host.size(); i++)
                {
                        if (i == host.size() || host[i] == ':')
                        {
                                std::string s = host.substr(x, i - x);
                                //
                                if (strstr(s.c_str(),".")) // x.x.x.x
                                {
                                        Parse pa(s,".");
                                        char slask[100]; // u2ip temporary hex2string conversion
                                        unsigned long b0 = static_cast<unsigned long>(pa.getvalue());
                                        unsigned long b1 = static_cast<unsigned long>(pa.getvalue());
                                        unsigned long b2 = static_cast<unsigned long>(pa.getvalue());
                                        unsigned long b3 = static_cast<unsigned long>(pa.getvalue());
                                        sprintf(slask,"%lx",b0 * 256 + b1);
                                        vec.push_back(slask);
                                        sprintf(slask,"%lx",b2 * 256 + b3);
                                        vec.push_back(slask);
                                }
                                else
                                {
                                        vec.push_back(s);
                                }
                                //
                                x = i + 1;
                        }
                }
                size_t sz = vec.size(); // number of byte pairs
                size_t i = 0; // index in in6_addr.in6_u.u6_addr16[] ( 0 .. 7 )
                unsigned short addr16[8];
                for (std::list<std::string>::iterator it = vec.begin(); it != vec.end(); it++)
                {
                        std::string bytepair = *it;
                        if (!bytepair.empty())
                        {
                                addr16[i++] = htons(Utility::hex2unsigned(bytepair));
                        }
                        else
                        {
                                addr16[i++] = 0;
                                while (sz++ < 8)
                                {
                                        addr16[i++] = 0;
                                }
                        }
                }
                memcpy(&sa.sin6_addr, addr16, sizeof(addr16));
                return true;
        }
#ifdef SOLARIS
        int errnum = 0;
        struct hostent *he = getipnodebyname( host.c_str(), AF_INET6, 0, &errnum );
#else
        struct hostent *he = gethostbyname2( host.c_str(), AF_INET6 );
#endif
        if (!he)
        {
                return false;
        }
        memcpy(&sa.sin6_addr,he -> h_addr_list[0],he -> h_length);
#ifdef SOLARIS
        free(he);
#endif
        return true;
#else
        struct addrinfo hints;
        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = ai_flags;
        hints.ai_family = AF_INET6;
        hints.ai_socktype = 0;
        hints.ai_protocol = 0;
        struct addrinfo *res;
        if (Utility::isipv6(host))
                hints.ai_flags |= AI_NUMERICHOST;
        int n = getaddrinfo(host.c_str(), NULL, &hints, &res);
        if (!n)
        {
                std::vector<struct addrinfo *> vec;
                struct addrinfo *ai = res;
                while (ai)
                {
                        if (ai -> ai_addrlen == sizeof(sa))
                                vec.push_back( ai );
                        ai = ai -> ai_next;
                }
                if (vec.empty())
                        return false;
                ai = vec[Utility::Rnd() % vec.size()];
                {
                        memcpy(&sa, ai -> ai_addr, ai -> ai_addrlen);
                }
                freeaddrinfo(res);
                return true;
        }
        std::string error = "Error: ";
#ifndef __CYGWIN__
        error += gai_strerror(n);
#endif
        return false;
#endif // NO_GETADDRINFO
}
#endif // IPPROTO_IPV6
#endif // ENABLE_IPV6


bool Utility::reverse(struct sockaddr *sa, socklen_t sa_len, std::string& hostname, int flags)
{
        std::string service;
        return Utility::reverse(sa, sa_len, hostname, service, flags);
}


bool Utility::reverse(struct sockaddr *sa, socklen_t sa_len, std::string& hostname, std::string& service, int flags)
{
        hostname = "";
        service = "";
#ifdef NO_GETADDRINFO
        switch (sa -> sa_family)
        {
        case AF_INET:
                if (flags & NI_NUMERICHOST)
                {
                        union {
                                struct {
                                        unsigned char b1;
                                        unsigned char b2;
                                        unsigned char b3;
                                        unsigned char b4;
                                } a;
                                ipaddr_t l;
                        } u;
                        struct sockaddr_in *sa_in = (struct sockaddr_in *)sa;
                        memcpy(&u.l, &sa_in -> sin_addr, sizeof(u.l));
                        char tmp[100];
                        sprintf(tmp, "%u.%u.%u.%u", u.a.b1, u.a.b2, u.a.b3, u.a.b4);
                        hostname = tmp;
                        return true;
                }
                else
                {
                        struct sockaddr_in *sa_in = (struct sockaddr_in *)sa;
                        struct hostent *h = gethostbyaddr( (const char *)&sa_in -> sin_addr, sizeof(sa_in -> sin_addr), AF_INET);
                        if (h)
                        {
                                hostname = h -> h_name;
                                return true;
                        }
                }
                break;
#ifdef ENABLE_IPV6
        case AF_INET6:
                if (flags & NI_NUMERICHOST)
                {
                        char slask[100]; // l2ip temporary
                        *slask = 0;
                        unsigned int prev = 0;
                        bool skipped = false;
                        bool ok_to_skip = true;
                        {
                                unsigned short addr16[8];
                                struct sockaddr_in6 *sa_in6 = (struct sockaddr_in6 *)sa;
                                memcpy(addr16, &sa_in6 -> sin6_addr, sizeof(addr16));
                                for (size_t i = 0; i < 8; i++)
                                {
                                        unsigned short x = ntohs(addr16[i]);
                                        if (*slask && (x || !ok_to_skip || prev))
                                                strcat(slask,":");
                                        if (x || !ok_to_skip)
                                        {
                                                sprintf(slask + strlen(slask),"%x", x);
                                                if (x && skipped)
                                                        ok_to_skip = false;
                                        }
                                        else
                                        {
                                                skipped = true;
                                        }
                                        prev = x;
                                }
                        }
                        if (!*slask)
                                strcpy(slask, "::");
                        hostname = slask;
                        return true;
                }
                else
                {
                        // %! TODO: ipv6 reverse lookup
                        struct sockaddr_in6 *sa_in = (struct sockaddr_in6 *)sa;
                        struct hostent *h = gethostbyaddr( (const char *)&sa_in -> sin6_addr, sizeof(sa_in -> sin6_addr), AF_INET6);
                        if (h)
                        {
                                hostname = h -> h_name;
                                return true;
                        }
                }
                break;
#endif
        }
        return false;
#else
        char host[NI_MAXHOST];
        char serv[NI_MAXSERV];
        // NI_NOFQDN
        // NI_NUMERICHOST
        // NI_NAMEREQD
        // NI_NUMERICSERV
        // NI_DGRAM
        int n = getnameinfo(sa, sa_len, host, sizeof(host), serv, sizeof(serv), flags);
        if (n)
        {
                // EAI_AGAIN
                // EAI_BADFLAGS
                // EAI_FAIL
                // EAI_FAMILY
                // EAI_MEMORY
                // EAI_NONAME
                // EAI_OVERFLOW
                // EAI_SYSTEM
                return false;
        }
        hostname = host;
        service = serv;
        return true;
#endif // NO_GETADDRINFO
}


bool Utility::u2service(const std::string& name, int& service, int ai_flags)
{
#ifdef NO_GETADDRINFO
        // %!
        return false;
#else
        struct addrinfo hints;
        service = 0;
        memset(&hints, 0, sizeof(hints));
        // AI_NUMERICHOST
        // AI_CANONNAME
        // AI_PASSIVE - server
        // AI_ADDRCONFIG
        // AI_V4MAPPED
        // AI_ALL
        // AI_NUMERICSERV
        hints.ai_flags = ai_flags;
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = 0;
        hints.ai_protocol = 0;
        struct addrinfo *res;
        int n = getaddrinfo(NULL, name.c_str(), &hints, &res);
        if (!n)
        {
                service = res -> ai_protocol;
                freeaddrinfo(res);
                return true;
        }
        return false;
#endif // NO_GETADDRINFO
}


unsigned long Utility::ThreadID()
{
#ifdef _WIN32
        return GetCurrentThreadId();
#else
        return (unsigned long)pthread_self();
#endif
}


std::string Utility::ToLower(const std::string& str)
{
        std::string r;
        for (size_t i = 0; i < str.size(); i++)
        {
                if (str[i] >= 'A' && str[i] <= 'Z')
                        r += str[i] | 32;
                else
                        r += str[i];
        }
        return r;
}


std::string Utility::ToUpper(const std::string& str)
{
        std::string r;
        for (size_t i = 0; i < str.size(); i++)
        {
                if (str[i] >= 'a' && str[i] <= 'z')
                        r += (char)(str[i] - 32);
                else
                        r += str[i];
        }
        return r;
}


std::string Utility::ToString(double d)
{
        char tmp[100];
        sprintf(tmp, "%f", d);
        return tmp;
}


unsigned long Utility::Rnd()
{
static  Utility::Rng generator( (unsigned long)time(NULL) );
        return generator.Get();
}


Utility::Rng::Rng(unsigned long seed) : m_value( 0 )
{
        m_tmp[0]= seed & 0xffffffffUL;
        for (int i = 1; i < TWIST_LEN; i++)
        {
                m_tmp[i] = (1812433253UL * (m_tmp[i - 1] ^ (m_tmp[i - 1] >> 30)) + i);
        }
}
                                        

unsigned long Utility::Rng::Get()
{
        unsigned long val = m_tmp[m_value];
        ++m_value;
        if (m_value == TWIST_LEN)
        {
                for (int i = 0; i < TWIST_IB; ++i)
                {
                        unsigned long s = TWIST(m_tmp, i, i + 1);
                        m_tmp[i] = m_tmp[i + TWIST_IA] ^ (s >> 1) ^ MAGIC_TWIST(s);
                }
                {
                        for (int i = 0; i < TWIST_LEN - 1; ++i)
                        {
                                unsigned long s = TWIST(m_tmp, i, i + 1);
                                m_tmp[i] = m_tmp[i - TWIST_IB] ^ (s >> 1) ^ MAGIC_TWIST(s);
                        }
                }
                unsigned long s = TWIST(m_tmp, TWIST_LEN - 1, 0);
                m_tmp[TWIST_LEN - 1] = m_tmp[TWIST_IA - 1] ^ (s >> 1) ^ MAGIC_TWIST(s);

                m_value = 0;
        }
        return val;
}

#ifdef SOCKETS_NAMESPACE
}
#endif