regarding getaddrinfo and getnameinfo

hi,

I was trying to get the corresponding hostname/canonical name for an
IP address.
I tried using both getaddrinfo and getnameinfo, but i am not getting
proper results.

For example
getaddrinfo:
Usage:
hints.ai_socktype = 0;
hints.ai_protocol = 0;
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_INET;
hints.ai_addrlen = 0;
hints.ai_addr = 0;
hints.ai_canonname = 0;

if (error = getaddrinfo("203.200.202.207", NULL, &hints, &result))
{
cout <<"ERROR USING getaddrinfo \n";
}


Output:
IP address 0 = 203.200.202.207 Canonical name 0 = 203.200.202.207
You will see that canonical name is being shown same as that of IP
address.




Example: I tried getnameinfo:
struct sockaddr_in a;
int error=0;
char hostname[NI_MAXHOST];

memset((void*)&a, 0 , sizeof(a));
a.sin_family = AF_INET;

if(inet_aton("203.27.235.25",
&(a.sin_addr)) == 0)
{
cout <<"inet_aton returned zero \n";
return;
}

if((error = getnameinfo((struct sockaddr*)&a, sizeof(struct
sockaddr),
hostname, sizeof(hostname), NULL,0,0)))
{

cout <<"getnameinfo returned error \n";
}

cout <<"Hostname obtained is >> \n";
cout <<hostname;



Observed Output is:
Hostname obtained is >> 203.27.235.25

Expected Output was:
Hostname obtained is >> icicibank.com


Can anyone tell me if my code is proper?
If anyone has code for converting ip address to hostname, can you
please forward me the code?

On Fri, 03 Aug 2007 22:54:21 -0700, amitkeerti wrote:

> hi,
>
> I was trying to get the corresponding hostname/canonical name for an
> IP address.
> I tried using both getaddrinfo and getnameinfo, but i am not getting
> proper results.

Try "whois"

--
Experience is that marvelous thing that enables you to
recognize a mistake when you make it again.
-- Anonymous
================================
Registered Linux User No. 306834

On Aug 5, 9:16 am, Agricolae Maximus <a...@mail15.com> wrote:
> On Fri, 03 Aug 2007 22:54:21 -0700, amitkeerti wrote:
> > hi,
>
> > I was trying to get the corresponding hostname/canonical name for an
> > IP address.
> > I tried using both getaddrinfo and getnameinfo, but i am not getting
> > proper results.
>
> Try "whois"
>
> --
> Experience is that marvelous thing that enables you to
> recognize a mistake when you make it again.
> -- Anonymous
> ================================
> Registered Linux User No. 306834


I am not looking at a command to do this.
I am looking for code to do this. So API or sequence of APIs which
will do this.
I tried getnameinfo and getaddrinfo. Probably the way I am calling
these 2 functions might be wrong...
can anybody provide me the code?

amitkeerti <(E-Mail Removed)> writes:

>On Aug 5, 9:16 am, Agricolae Maximus <a...@mail15.com> wrote:
>> On Fri, 03 Aug 2007 22:54:21 -0700, amitkeerti wrote:
>> > hi,
>>
>> > I was trying to get the corresponding hostname/canonical name for an
>> > IP address.
>> > I tried using both getaddrinfo and getnameinfo, but i am not getting
>> > proper results.

man getaddrinfo
If you told us what you were getting we might be able to help. As it is,
we are entirely in the dark.

Ie show us your code fragment and what the output is.



>>
>> Try "whois"
>>
>> --
>> Experience is that marvelous thing that enables you to
>> recognize a mistake when you make it again.
>> -- Anonymous
>> ================================
>> Registered Linux User No. 306834


>I am not looking at a command to do this.
>I am looking for code to do this. So API or sequence of APIs which
>will do this.
>I tried getnameinfo and getaddrinfo. Probably the way I am calling
>these 2 functions might be wrong...
>can anybody provide me the code?