RE: Information abt rotuing and interfaces

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Check this link.
http://www.daimi.au.dk/~kasperd/comp.os.linux.development.faq.html

One of the queries is related to getting the IP address.

-Mani


-----Original Message-----
From: kernelnewbies-bounce@nl.linux.org
[mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of paridhi bansal
Sent: Tuesday, November 19, 2002 4:36 PM
To: Mani Mahadevan; kernelnewbies@nl.linux.org
Subject: RE: Information abt rotuing and interfaces


Hi

I don't think this call will help becoz i am getting
the correct ip in this form.:

For 151.2.123.75 i am getting 0.0.151.2
127.0.0.0 i am getting 0.0.127.0

SO it is getting the right ips but somehow there is
some minor problem.What's the way out??

Paridhi
--- Mani Mahadevan <mrsmani@cisco.com> wrote:
> Its just one of the ioctl commands.
> ioctl (sockfd, SIOCGIFINDEX,ifr)
> 
> -Mani
> 
> -----Original Message-----
> From: paridhi bansal
> [mailto:paridhibansal@yahoo.com]
> Sent: Tuesday, November 19, 2002 4:06 PM
> To: Mani Mahadevan
> Subject: RE: Information abt rotuing and interfaces
> 
> 
> I am new to nw prog..Could u pls tell me how to use
> SIOCGIFINDEX..
> 
> Paridhi
> --- Mani Mahadevan <mrsmani@cisco.com> wrote:
> > * Fill in the Index Value using SIOCGIFINDEX
> > (Preventive measure)
> > * Dump the contents in Hex..say from ifr
> > ->ifr_addr.sa_data[0]
> > to ifr ->ifr_addr.sa_data[3] and check.
> > 
> > HTH
> > -Mani
> > 
> > 
> > -----Original Message-----
> > From: paridhi bansal
> > [mailto:paridhibansal@yahoo.com]
> > Sent: Tuesday, November 19, 2002 3:05 PM
> > To: Mani Mahadevan; kernelnewbies@nl.linux.org;
> > dharmenderr@cybage.comT
> > Subject: RE: Information abt rotuing and
> interfaces
> > 
> > 
> > Thanx for the answers. I am able to get the some
> > portion of the ips but not the complete ip of the
> > interfaces. Here's the code i am using. Could u
> pls
> > tell me whre exactly is the error??Thanx in
> advance.
> > 
> > #include<stdio.h>
> > #include<net/if.h>
> > #include<sys/ioctl.h>
> > #include<sys/socket.h>
> > #include<netdb.h>
> > 
> > #define BUFSIZ 4096 
> > 
> > main()
> > {
> > 
> > 	int s,n;
> > 	struct ifconf ifc;
> > 	char buf[BUFSIZ];
> >       	struct ifreq *ifr;
> > 	struct in_addr *iff;
> > 
> > 	s=socket(AF_INET, SOCK_DGRAM, 0);
> > 	ifc.ifc_len = sizeof(buf);
> > 	ifc.ifc_buf = buf;
> > 	if (ioctl(s, SIOCGIFCONF, (char *) &ifc) < 0) 
> > 	{
> >            printf("\nError1");
> > 	}
> >  
> > 	ifr = ifc.ifc_req;
> > 	printf("Before for loop");
> > 
> > 	for (n=ifc.ifc_len/sizeof(struct ifreq); --n >=
> 0;
> > ifr++) 
> > 	{
> > 		printf("\nPrinting name: %s" ,ifr->ifr_name);
> > 		
> > 		if(ioctl(s, SIOCGIFADDR, (char *)ifr) < 0)
> > 			printf("\nError2");
> > 		else 
> > 		{
> > 		      iff=(struct in_addr *)(ifr
> > ->ifr_addr.sa_data
> > );
> > 		      printf("\nPrinting address:
> > %s",inet_aton(*iff));
> > 		}
> > 				
> > 		if(ioctl(s, SIOCGIFNETMASK, (char *)ifr) < 0)
> > 			printf("\nError3");
> > 		else 
> > 		{
> > 		      iff=(struct in_addr *)(ifr
> > ->ifr_netmask.sa_data );
> > 		      printf("\nPrinting mask:
> > %s",inet_aton(*iff));
> > 		}
> > 				
> > 
> > Paridhi
> > --- Mani Mahadevan <mrsmani@cisco.com> wrote:
> > > Thanks for correcting me.
> > > 
> > > -Mani
> > > 
> > > -----Original Message-----
> > > From: kernelnewbies-bounce@nl.linux.org
> > > [mailto:kernelnewbies-bounce@nl.linux.org]On
> > Behalf
> > > Of Dharmender Rai
> > > Sent: Tuesday, November 19, 2002 12:08 PM
> > > To: Mani Mahadevan; paridhi bansal;
> > > kernelnewbies@nl.linux.org
> > > Subject: RE: Information abt rotuing and
> > interfaces
> > > 
> > > 
> > > routing info can be found in /etc/gateways
> > >  --- Mani Mahadevan <mrsmani@cisco.com> wrote: >
> *
> > > For
> > > getting the Interface List use SIOCGIFCONF cmd
> > > > in ioctl.
> > > > * Then use the SIOCGIFFLAGS ioctl cmd for each
> > of
> > > > the above found interface
> > > >   and check for ifr.ifr_flags to be IFF_UP.
> This
> > > > would tell you whether the
> > > > interface is
> > > >   Up or not.
> > > > * Go thru the list of ioctl commands in
> > > > linux/sockios.h & use them
> > > > appropriately
> > > >   as per your requirement.
> > > > 
> > > > * Reg routing it should be in the /proc, but
> not
> > > > sure about the exact
> > > > loaction.
> > > > 
> > > > -Mani
> > > > 
> > > > 
> > > > -----Original Message-----
> > > > From: kernelnewbies-bounce@nl.linux.org
> > > > [mailto:kernelnewbies-bounce@nl.linux.org]On
> > > Behalf
> > > > Of paridhi bansal
> > > > Sent: Monday, November 18, 2002 2:40 PM
> > > > To: kernelnewbies@nl.linux.org
> > > > Subject: Information abt rotuing and
> interfaces
> > > > 
> > > > 
> > > > Hi!!
> > > > 
> > > > Can somebody tell me how can i get the all
> > > > information
> > > > abt the interfaces that r up on my machine
> using
> > > > ioctl
> > > > call???
> > > > 
> > > > Where is the kernel file that stores the
> routing
> > > > information??
> > > > 
> > > > Paridhi 
> > > > 
> > > >
> > __________________________________________________
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> 
=== message truncated ===


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