Hi,

Sorry for using English, but it's much faster (for me) . :)

I've written a Java application that runs on a Linux machine and communicates (via UDP) with the local (to its net) and remote (other nets) hosts.
A text file had to be created to contain these nets IPs for broadcasting(locally)/multicasting(remotely). As well some services were added, to access these IPs.
~zeev/nets.txt
--------
my_net 190.12.144
remote_net 222.12.150
...

I would prefer to use the same method that I'm using in C/C++, i.e '/etc/networks' configuration file and the 'getnetbyname()' service to retrieve the requested net's IP (instead of the method I've implemented in Java).
/etc/networks
-------------
127
my_net 190.12.144
remote_net 222.12.150
...

The problem is that I couldn't find the 'getnetbyname()' service under any Java package.

Is there a way to perform it properly ?

Sincerely

Zeev

Thanks for the response.

But the java.net.InetAddress class handles only the '/etc/hosts' file - all the methods retrieve only the host oriented attributes: hostIp by name, hostName by IP, ... etc.
There are verification methods, such as isAnyLocalAddress(), isMulticastAddress(), ...,
but the provided services are dealing with the already retrieved IP address.

http://linux.die.net/man/3/getnetbyname

авторgetnetbyname(3) - Linux man page
NAME
getnetent, getnetbyname, getnetbyaddr, setnetent, endnetent - get network entry
SYNOPSIS
#include <netdb.h>

struct netent *getnetent(void);

struct netent *getnetbyname(const char *name);

struct netent *getnetbyaddr(long net, int type);

void setnetent(int stayopen);

void endnetent(void);
DESCRIPTION
The getnetent() function reads the next line from the file /etc/networks and returns a structure netent containing the broken out fields from the line. The /etc/networks file is opened if necessary.
The getnetbyname() function returns a netent structure for the line from /etc/networks that matches the network name.

The getnetbyaddr() function returns a netent structure for the line that matches the network number net of type type.

The setnetent() function opens and rewinds the /etc/networks file. If stayopen is true (1), then the file will not be closed between calls to getnetbyname() and getnetbyaddr().

The endnetent() function closes /etc/networks.

The netent structure is defined in <netdb.h> as follows:

struct netent {
char *n_name; /* official network name */
char **n_aliases; /* alias list */
int n_addrtype; /* net address type */
unsigned long int n_net; /* network number */
}
The members of the netent structure are:

n_name
The official name of the network.
n_aliases
A zero terminated list of alternative names for the network.
n_addrtype
The type of the network number; always AF_INET.
n_net
The network number in host byte order.
RETURN VALUE
The getnetent(), getnetbyname() and getnetbyaddr() functions return the netent structure, or a NULL pointer if an error occurs or the end of the file is reached.
FILES
/etc/networks
networks database file
CONFORMING TO
4.3BSD, POSIX.1-2001.
SEE ALSO
getprotoent(3), getservent(3), networks(5) RFC 1101
REFERENCED BY
ipsec_atoaddr(3), ipsec_ttoaddr(3)