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/*
* Ivy League
*
* INET Addresses
*
* Copyright 1990-2000
* Laboratoire de Recherche en Informatique (LRI)
* Centre d'Etudes de la Navigation Aerienne (CENA)
*
* original code by Michel Beaudouin-Lafon,
* modified by Stephane Chatty
*
* $Id$
*
*/
#include "InetAddress.h"
#include <sys/utsname.h>
#include <stdio.h>
#ifdef __osf__
extern "C" {
unsigned short htons (unsigned short);
unsigned short ntohs (unsigned short);
int gethostname (char*, int);
#endif
#include <netdb.h>
#ifdef __osf__
}
#endif
// constructors for inet addresses
// inet address specified by:
// hostname / port# (ANY if hostname is NIL, LOOPBACK if hostname is "")
// hostid / port# (predefined hostids ANYADDR, ...)
// todo:
// hostname / service name ??
//
/*?
IvlInetAddresses should only be allocated with new because they
can be deleted and reallocated by \type{IvlSocket} class.
?*/
IvlInetAddress :: IvlInetAddress ()
: IvlAddress (),
HostName (),
HasHostName (false)
{
}
/*?
Construct an inet address, from a hostname and a port number.
The address is valid only if the host is valid.
If \var{host} is the empty string, the loopback host is used;
if it is the nil pointer, the wildcard (INADDR_ANY) is used.
If the port number is 0, it will be allocated by the system.
?*/
IvlInetAddress :: IvlInetAddress (const char* name, sword port)
: IvlAddress (),
HostName (),
HasHostName (false)
{
if (name && *name) {
struct hostent *host = gethostbyname (name);
if (! host)
return;
memcpy (&Addr.sin_addr, host->h_addr, host->h_length);
} else
Addr.sin_addr.s_addr = name ? INADDR_LOOPBACK : INADDR_ANY;
Addr.sin_family = AF_INET;
Addr.sin_port = htons (port);
Valid = true;
}
/*?
Construct an inet address, from a host id (internet address) and a port number.
If the port number is 0, it is assigned by the system.
The host ids \var{^{ANYADDR}}, \var{^{LOOPBACK}} and \var{^{BROADCAST}} are predefined.
\var{ANYADDR} is used to receive messages from anywhere.
\var{LOOPBACK} is the local host address.
\var{BROADCAST} makes it possible to send data to all the hosts of a local area network.
?*/
IvlInetAddress :: IvlInetAddress (lword host, sword port)
: IvlAddress (),
HostName (),
HasHostName (false)
{
Addr.sin_family = AF_INET;
Addr.sin_port = htons (port);
Addr.sin_addr.s_addr = htonl (host);
Valid = true;
}
/*?nodoc?*/
IvlInetAddress :: ~IvlInetAddress ()
{
}
/*?nodoc?*/
int
IvlInetAddress :: Family ()
{
return AF_INET;
}
/*?nodoc?*/
int
IvlInetAddress :: Length ()
{
return sizeof (Addr);
}
/*?nodoc?*/
SockAddr*
IvlInetAddress :: GetSockAddr ()
{
return (SockAddr*) &Addr;
}
/*?
This is a global function (static member of class \typ{IvlInetAddress}.
It returns the internet address of the local host.
This is different from the predefined address \var{LOOPBACK}:
\var{LOOPBACK} is the same constant on each machine, so that it cannot
be communicated across the network.
The value returned by \fun{LoopBack} is the unique internet address of the local host.
Thus it can be communicated to another host across the network.
?*/
lword
IvlInetAddress :: LoopBack ()
{
static lword loopback = 0;
if (loopback)
return loopback;
struct hostent *host;
#if 0
char name [128];
gethostname (name, sizeof (name));
host = gethostbyname (name);
#else
struct utsname un;
if (uname (&un) < 0) {
Error (ErrFatal, "address", "cannot get name of local host");
return 0;
}
host = gethostbyname (un.nodename);
#endif
if (! host) {
Error (ErrFatal, "address", "cannot get address of local host");
return 0;
}
return loopback = * ((lword *) host->h_addr);
}
/*?
Return the host number of the address.
?*/
lword
IvlInetAddress :: Host ()
{
return ntohl (Addr.sin_addr.s_addr);
}
/*?
Return the port number of the address.
?*/
sword
IvlInetAddress :: Port ()
{
return ntohs (Addr.sin_port);
}
/*?
Return a const string representing the hostname part of the address if any
or NULL if it does not exist (INADDR_ANY, INADDR_LOOPBACK or INADDR_BROADCAST).
This is an interface to unix \fun{gethostbyaddr} system call.
?*/
const char*
IvlInetAddress :: GetHostName ()
{
struct hostent *host;
unsigned long saddr;
if (HasHostName)
return HostName;
saddr = Addr.sin_addr.s_addr;
host = gethostbyaddr ((char*) &saddr, sizeof (long), AF_INET);
if (host)
HostName = host->h_name;
#if 0
} else
HostName = GetNoHostName();
#endif
else {
struct utsname un;
if (uname (&un) < 0) {
Error (ErrFatal, "GetHostName", "cannot get name of local host");
HostName = 0;
}
HostName = un.nodename;
}
HasHostName = true;
return HostName;
}
/*?nodoc?*/
const char*
IvlInetAddress :: GetNoHostName ()
{
const char* hname;
unsigned long saddr = Addr.sin_addr.s_addr;
if (saddr == INADDR_ANY)
hname = "ANY";
else if (saddr == INADDR_LOOPBACK)
hname = "LOOPBACK";
else if (saddr == INADDR_BROADCAST)
hname = "BROADCAST";
else
hname = "???";
return hname;
}
/*?
Return a newly allocated \typ{char*} pointing to a string representing
the internet address as "hostname:port". If no host name can be found
then it can be "ANY" (INADDR_ANY), "LOOPBACK" (INADDR_LOOPBACK), "BROADCAST"
(INADDR_BROADCAST) or "???".
If argument \var{buf} is not null, return it's value in buf and do not
allocate any memory.
?*/
char*
IvlInetAddress :: StrRepr (char* buf)
{
const char* hname;
if (HasHostName) {
hname = HostName;
if (!hname)
hname = GetNoHostName ();
} else
hname = GetHostName ();
if (! buf)
buf = new char [ strlen(hname) + 2 + 7 ];
sprintf (buf, "%s::%d",hname, ntohs (Addr.sin_port));
return buf;
}
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