Getting eth0 ip address
Teemu
Can anyone tell me howto read the external ip adress of i.e. eth0?
And no I don't want to use ifconfig for it.
-Teemu
Juha Laiho
>Can anyone tell me howto read the external ip adress of i.e. eth0?
>And no I don't want to use ifconfig for it.
~$ /sbin/ip -f inet -o addr show dev eth0 primary
2: eth0 inet 192.168.105.10/24 brd 192.168.105.255 scope global eth0
.. but if you meant that you don't want to use an external command for
finding the address, then I guess you could look at the source of
ifconfig (or 'ip') command to find out how they do it.
--
Wolf a.k.a. Juha Laiho Espoo, Finland
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Lew Pitcher
Hash: SHA1
I was once told (and I quote):
open a
fh=socket(PF_INET,SOCK_DGRAM,IPPROTO_IP);
then use a
struct ifreq if;
and set
strcpy(if.ifr_name,"eth0");
then query by
ioctl(fh,SIOGIFADDR,&if);
and see in
if.ifr_addr
the value!.
HTH
- --
Lew Pitcher
IT Specialist, Enterprise Data Systems,
Enterprise Technology Solutions, TD Bank Financial Group
(Opinions expressed are my own, not my employers')
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Jose Maria Lopez Hernandez
ip address show eth0
> -Teemu
Regards.
--
Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
jker...@bgsec.com
bgSEC Seguridad y Consultoria de Sistemas Informaticos
http://www.bgsec.com
ESPAÑA
The only people for me are the mad ones -- the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn, burn
like fabulous yellow Roman candles.
-- Jack Kerouac, "On the Road"
Kasper Dupont
Robert Larsen
#include <iostream>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
using namespace std;
int main(int argc, char ** argv)
{
char hostname[256];
if(gethostname(hostname,256) != 0)
{
cout << "Could not get hostname." << endl;
return -1;
}
cout << hostname << endl;
struct ifreq my_ifreqs[10];
struct ifconf my_ifconf;
my_ifconf.ifc_len = sizeof(my_ifreqs);
my_ifconf.ifc_req = my_ifreqs;
int num, i, sock = socket(AF_INET,SOCK_DGRAM,0);
if(socket == 0)
{
cout << "Could not create socket." << endl;
return -1;
}
if(ioctl(sock,SIOCGIFCONF,&my_ifconf) < 0)
{
cout << "Error in ioctl()." << endl;
close(sock);
return -1;
}
close(sock);
num = my_ifconf.ifc_len / sizeof(struct ifreq);
for(i = 0; i < num; i++)
{
struct sockaddr_in * adr = (struct sockaddr_in *)&my_ifreqs[ i
].ifr_ifru.ifru_addr;
cout << inet_ntoa((struct in_addr)adr->sin_addr) << endl;
}
return 0;
}
robert@robert:~/code$ ./test
robert
127.0.0.1
192.168.1.106
robert@robert:~/code$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:02:B3:A2:1B:66
inet addr:192.168.1.106 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:35556 errors:0 dropped:0 overruns:0 frame:0
TX packets:35647 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12387898 (11.8 MiB) TX bytes:5655407 (5.3 MiB)
Interrupt:9 Base address:0xd800 Memory:dd800000-dd800038
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:304659 errors:0 dropped:0 overruns:0 frame:0
TX packets:304659 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:25107465 (23.9 MiB) TX bytes:25107465 (23.9 MiB)
robert@robert:~/code$