Hi all,

i'm having problems grabbing the IP out of the h_addr_list (or h_addr)
sturct on a
freshly gethostbyname'd hostent structure.

observe:

struct  in_addr **address;

......

if((h=gethostbyname(node)) == NULL) {
herror("gethostbyname");
exit(1);
}

address=(struct in_addr **)h->h_addr;

for(; *address != NULL; address++);
printf("addr: %s\n",*address);
exit(1);


just to purely see if I can get the address..
I am unable to get the IP...

can anyone help pls?

thanks

bm

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"BM" <b.marsh@gmx.net> wrote in message
news:1106858791.993371.9910@z14g2000cwz.googlegroups.com...
> Hi all,
>
> i'm having problems grabbing the IP out of the h_addr_list (or h_addr)
> sturct on a
> freshly gethostbyname'd hostent structure.
>
> observe:
>
> struct  in_addr **address;
>
> ......
>
> if((h=gethostbyname(node)) == NULL) {
> herror("gethostbyname");
> exit(1);
> }
>
> address=(struct in_addr **)h->h_addr;
>
> for(; *address != NULL; address++);
> printf("addr: %s\n",*address);
> exit(1);
>
>
> just to purely see if I can get the address..
> I am unable to get the IP...
>
> can anyone help pls?
>
> thanks
>
> bm
>

Your printf is incorrect. If you want to print it, you need to do a
inet_ntoa(*address).
As in printf("addr: %s\n", inet_ntoa(*address));

--

Fletcher Glenn

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BM <b.marsh@gmx.net> wrote:
> i'm having problems grabbing the IP out of the h_addr_list (or h_addr)
> sturct on a
> freshly gethostbyname'd hostent structure.

> struct  in_addr **address;

> if((h=gethostbyname(node)) == NULL) {
> herror("gethostbyname");
> exit(1);
> }

> address=(struct in_addr **)h->h_addr;

You need

address = ( struct in_addr ** ) h->h_addr_list;

h_addr is just defined to h_addr_list[ 0 ].

> for(; *address != NULL; address++);

Here you've got a semicolon at the end of the line that definitely
shouldn't be there...

> printf("addr: %s\n",*address);

Whats pointed to by address isn't a simple string so you need

printf( "addr = %s\n", inet_ntoa( *address );

to convert it to a string in numbers-and-dots notation.

Regards, Jens
--
\   Jens Thoms Toerring  ___  Jens.Toerring@physik.fu-berlin.de
\__________________________  http://www.toerring.de

[ Post a follow-up to this message ]

All, thanks for your help.

Interestingly enough, inet_ntop didnt work; i had to indeed use
inet_ntoa. Hmm, i will dig round the manpages to suss this out.
thanks again all.

bry.

[ Post a follow-up to this message ]

BM <b.marsh@gmx.net> wrote:
> Interestingly enough, inet_ntop didnt work; i had to indeed use
> inet_ntoa. Hmm, i will dig round the manpages to suss this out.

Show us how you tried to invoke inet_ntop(), perhaps we can help...

Regards, Jens
--
\   Jens Thoms Toerring  ___  Jens.Toerring@physik.fu-berlin.de
\__________________________  http://www.toerring.de

[ Post a follow-up to this message ]