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trustlix
n00b
Joined: 25 May 2004
Posts: 22
Location: Brazil
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 Posted: Tue Oct 18, 2005 2:45 pm Post subject: [SOLVED]Problem when get hostname and domainname in java cod |
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Hy all,
Im having some terrible time with the java code above (Im using the sun-jdk-1.4.2.09):
| Code: |
import java.net.InetAddress;
public class Teste {
public static void main(String args[]) throws Exception{
String host = InetAddress.getLocalHost().getHostName();
System.out.println("host- getHostName: "+host);
host = InetAddress.getLocalHost().getCanonicalHostName();
System.out.println("host- getCanonical: "+host);
host = InetAddress.getLocalHost().getHostAddress();
System.out.println("host- getHostAddress: "+host);
host = InetAddress.getByName(InetAddress.getLocalHost().
getHostAddress()).getHostName();
System.out.println("host- getByName: "+host);
}
}
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When I run this app, I get the following output:
| Quote: | $ java Teste
host- getHostName: notexerozo.gentuxxx
host- getCanonical: notexerozo.gentuxxx
host- getHostAddress: 10.10.1.27
host- getByName: notexerozo.gentuxxx
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But it should be:
| Quote: | $ java Teste
host- getHostName: notexerozo
host- getCanonical: notexerozo.gentuxxx
host- getHostAddress: 10.10.1.27
host- getByName: notexerozo.gentuxxx
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Where the getHostName is just the name of the host, whitout dommain....
Here is my /etc/hosts:
| Code: |
127.0.0.1 localhost.localdomain localhost
10.10.1.27 notexerozo.gentuxxx notexerozo
# IPV6 versions of localhost and co
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
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and the output of the commands:
| Quote: | #hostname
notexerozo
#dnsdomainname
gentuxxx
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I hope anyone nows what's going on here.... thanksss.
Last edited by trustlix on Sun Oct 23, 2005 8:21 pm; edited 1 time in total |
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kloune
Apprentice
Joined: 09 May 2004
Posts: 185
Location: lost
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| Posted: Wed Oct 19, 2005 10:06 am Post subject: |
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Hi,
Did you try to revers the names in this line ?
| Code: |
10.10.1.27 notexerozo.gentuxxx notexerozo
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Had same problem a while ago in another program, I think that solved it. |
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trustlix
n00b
Joined: 25 May 2004
Posts: 22
Location: Brazil
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| Posted: Wed Oct 19, 2005 1:36 pm Post subject: |
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Humm...
I tried that trick, but doing this i also lost the canonical-name of my host (that should be notexerozo.gentuxxx).
All I got was the hostname.
I also used some code from a Linux book: a C program that does the same thing, and it worked without problems.
I really don't know if this is a JVM problem, or some compillation issue in my system... I'll keep trying 
Thanks.
| Code: |
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
char *host, **names, **addrs;
struct hostent *hostinfo;
if(argc == 1) {
char myname[256];
gethostname(myname, 255);
host = myname;
}
else
host = argv[1];
hostinfo = gethostbyname(host);
if(!hostinfo) {
fprintf(stderr, "cannot get info for host: %s\n", host);
exit(1);
}
printf("results for host %s:\n", host);
printf("Name: %s\n", hostinfo -> h_name);
printf("Aliases:");
names = hostinfo -> h_aliases;
while(*names) {
printf(" %s", *names);
names++;
}
printf("\n");
if(hostinfo -> h_addrtype != AF_INET) {
fprintf(stderr, "not an IP host!\n");
exit(1);
}
addrs = hostinfo -> h_addr_list;
printf("IP Address: ");
while(*addrs) {
printf(" %s", inet_ntoa(*(struct in_addr *)*addrs));
addrs++;
}
printf("\n");
exit(0);
}
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The output was:
| Quote: | $./net_information
results for host notexerozo:
Name: notexerozo.gentuxxx
Aliases: notexerozo
IP Address: 10.10.1.27
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trustlix
n00b
Joined: 25 May 2004
Posts: 22
Location: Brazil
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| Posted: Sun Oct 23, 2005 8:19 pm Post subject: |
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I think i found the problem.
I use DHCP here, and my /etc/hosts was wrong.
I changed the line:
| Code: |
127.0.0.1 localhost.localdomain localhost
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to
| Code: |
127.0.0.1 localhost.localdomain notexerozo localhost
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Just included the second alias, and now it's working.
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