llhost.cpp

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#include "linden_common.h"

#include "llhost.h"

#include "llerror.h"

#if LL_WINDOWS
        #define WIN32_LEAN_AND_MEAN
        #include <winsock2.h>
#else
        #include <netdb.h>
        #include <netinet/in.h> // ntonl()
        #include <sys/types.h>
        #include <sys/socket.h>
        #include <arpa/inet.h>
#endif

LLHost LLHost::invalid(INVALID_PORT,INVALID_HOST_IP_ADDRESS);

LLHost::LLHost(const std::string& ip_and_port)
{
        std::string::size_type colon_index = ip_and_port.find(":");
        if (colon_index == std::string::npos)
        {
                mIP = ip_string_to_u32(ip_and_port.c_str());
                mPort = 0;
        }
        else
        {
                std::string ip_str(ip_and_port, 0, colon_index);
                std::string port_str(ip_and_port, colon_index+1);

                mIP = ip_string_to_u32(ip_str.c_str());
                mPort = atol(port_str.c_str());
        }
}

void LLHost::getString(char* buffer, S32 length) const
{
        if (((U32) length) < MAXADDRSTR + 1 + 5)
        {
                llerrs << "LLHost::getString - string too short" << llendl;
                return;
        }

        snprintf(buffer, length, "%s:%u", u32_to_ip_string(mIP), mPort);        /* Flawfinder: ignore */
}

void LLHost::getIPString(char* buffer, S32 length) const
{
        if ( ((U32) length) < MAXADDRSTR)
        {
                llerrs << "LLHost::getIPString - string too short" << llendl;
                return;
        }

        snprintf(buffer, length, "%s", u32_to_ip_string(mIP));  /* Flawfinder: ignore */
}


std::string LLHost::getIPandPort() const
{
        char buffer[MAXADDRSTR + 1 + 5];        /*Flawfinder: ignore*/
        getString(buffer, sizeof(buffer));
        return buffer;
}


std::string LLHost::getIPString() const
{
        return std::string( u32_to_ip_string( mIP ) );
}


void LLHost::getHostName(char *buf, S32 len) const
{
        hostent *he;

        if (INVALID_HOST_IP_ADDRESS == mIP)
        {
                llwarns << "LLHost::getHostName() : Invalid IP address" << llendl;
                buf[0] = '\0';
                return;
        }
        he = gethostbyaddr((char *)&mIP, sizeof(mIP), AF_INET);
        if (!he)
        {
#if LL_WINDOWS
                llwarns << "LLHost::getHostName() : Couldn't find host name for address " << mIP << ", Error: " 
                        << WSAGetLastError() << llendl;
#else
                llwarns << "LLHost::getHostName() : Couldn't find host name for address " << mIP << ", Error: " 
                        << h_errno << llendl;
#endif
                buf[0] = '\0';                                          
        }
        else
        {
                strncpy(buf, he->h_name, len); /*Flawfinder: ignore*/
                buf[len-1] = '\0';
        }
}

std::string LLHost::getHostName() const
{
        hostent* he;
        if (INVALID_HOST_IP_ADDRESS == mIP)
        {
                llwarns << "LLHost::getHostName() : Invalid IP address" << llendl;
                return std::string();
        }
        he = gethostbyaddr((char *)&mIP, sizeof(mIP), AF_INET);
        if (!he)
        {
#if LL_WINDOWS
                llwarns << "LLHost::getHostName() : Couldn't find host name for address " << mIP << ", Error: " 
                        << WSAGetLastError() << llendl;
#else
                llwarns << "LLHost::getHostName() : Couldn't find host name for address " << mIP << ", Error: " 
                        << h_errno << llendl;
#endif
                return std::string();
        }
        else
        {
                return ll_safe_string(he->h_name);
        }
}

BOOL LLHost::setHostByName(const char *string)
{
        hostent *he;
        char local_name[MAX_STRING];  /*Flawfinder: ignore*/

        if (strlen(string)+1 > MAX_STRING) /*Flawfinder: ignore*/
        {
                llerrs << "LLHost::setHostByName() : Address string is too long: " 
                        << string << llendl;
        }

        strncpy(local_name, string,MAX_STRING);  /*Flawfinder: ignore*/
        local_name[MAX_STRING-1] = '\0';
#if LL_WINDOWS
        // We may need an equivalent for Linux, but not sure - djs
        _strupr(local_name);
#endif

        he = gethostbyname(local_name); 
        if(!he) 
        {
                U32 ip_address = inet_addr(string);
                he = gethostbyaddr((char *)&ip_address, sizeof(ip_address), AF_INET);
        }

        if (he)
        {
                mIP = *(U32 *)he->h_addr_list[0];
                return TRUE;
        }
        else 
        {
                setAddress(local_name);

                // In windows, h_errno is a macro for WSAGetLastError(), so store value here
                S32 error_number = h_errno;
                switch(error_number) 
                {
                        case TRY_AGAIN: // XXX how to handle this case? 
                                llwarns << "LLHost::setAddress(): try again" << llendl;
                                break;
                        case HOST_NOT_FOUND:
                        case NO_ADDRESS:        // NO_DATA
                                llwarns << "LLHost::setAddress(): host not found" << llendl;
                                break;
                        case NO_RECOVERY:
                                llwarns << "LLHost::setAddress(): unrecoverable error" << llendl;
                                break;
                        default:
                                llwarns << "LLHost::setAddress(): unknown error - " << error_number << llendl;
                                break;
                }
                return FALSE;
        }
}

LLHost& LLHost::operator=(const LLHost &rhs)
{ 
        if (this != &rhs)
        {
                set(rhs.getAddress(), rhs.getPort());
        }
        return *this;           
}


std::ostream& operator<< (std::ostream& os, const LLHost &hh)
{
        os << u32_to_ip_string(hh.mIP) << ":" << hh.mPort ;
        return os;
}


//std::istream& operator>> (std::istream& is, LLHost &rh)
//{
//      is >> rh.mIP;
//    is >> rh.mPort;
//    return is;
//}

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