Вот мультиплатформенное решение ... Windows, Linux и MacOSX.
Вы можете получить IP-адрес, порт, sockaddr_in, порт.
BOOL GetMyHostName(LPSTR pszBuffer, UINT nLen)
{
BOOL ret;
ret = FALSE;
if (pszBuffer && nLen)
{
if ( gethostname(pszBuffer, nLen) == 0 )
ret = TRUE;
else
*pszBuffer = '\0';
}
return ret;
}
ULONG GetPeerName(SOCKET _clientSock, LPSTR _pIPStr, UINT _IPMaxLen, int *_pport)
{
struct sockaddr_in sin;
unsigned long ipaddr;
ipaddr = INADDR_NONE;
if (_pIPStr && _IPMaxLen)
*_pIPStr = '\0';
if (_clientSock!=INVALID_SOCKET)
{
#if defined(_WIN32)
int locallen;
#else
UINT locallen;
#endif
locallen = sizeof(struct sockaddr_in);
memset(&sin, '\0', locallen);
if (getpeername(_clientSock, (struct sockaddr *) &sin, &locallen) == 0)
{
ipaddr = GetSinIP(&sin, _pIPStr, _IPMaxLen);
if (_pport)
*_pport = GetSinPort(&sin);
}
}
return ipaddr;
}
ULONG GetSinIP(struct sockaddr_in *_psin, LPSTR pIPStr, UINT IPMaxLen)
{
unsigned long ipaddr;
ipaddr = INADDR_NONE;
if (pIPStr && IPMaxLen)
*pIPStr = '\0';
if ( _psin )
{
#if defined(_WIN32)
ipaddr = _psin->sin_addr.S_un.S_addr;
#else
ipaddr = _psin->sin_addr.s_addr;
#endif
if (pIPStr && IPMaxLen)
{
char *pIP;
struct in_addr in;
#if defined(_WIN32)
in.S_un.S_addr = ipaddr;
#else
in.s_addr = ipaddr;
#endif
pIP = inet_ntoa(in);
if (pIP && strlen(pIP) < IPMaxLen)
strcpy(pIPStr, pIP);
}
}
return ipaddr;
}
int GetSinPort(struct sockaddr_in *_psin)
{
int port;
port = 0;
if ( _psin )
port = _Xntohs(_psin->sin_port);
return port;
}