can anyone help me with this?

[vinney143]

i need a C program which gets hostname as the input and prints the IP address of that hostname.
(Hostname's IP addresses will be given using a seperate file in define.....

just guide me with respect to this...

thanks....

[Cucumber]

look into the winsock functions, there are a couple that can do the translation between hostnames and ip addresses

[vinney143]

i need a C program which gets hostname as the input and prints the IP address of that hostname.
(Hostname's IP addresses will be given using a seperate file in define.....

just guide me with respect to this...

thanks....

#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>

struct hostent *he;
struct in_addr a;

int
main (int argc, char **argv)
{
if (argc != 2)
{
fprintf(stderr, "usage: %s hostname\n", argv[0]);
return 1;
}
he = gethostbyname (argv[1]);
if (he)
{
printf("name: %s\n", he->h_name);
while (*he->h_aliases)
printf("alias: %s\n", *he->h_aliases++);
while (*he->h_addr_list)
{
bcopy(*he->h_addr_list++, (char *) &a, sizeof(a));
printf("address: %s\n", inet_ntoa(a));
}
}
else
herror(argv[0]);
return 0;
}


can any one please explain me this program....

struct hostent *he;
struct in_addr a;

what these two structures are? waht they will do?

[patrickhogan]

#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>

struct hostent *he;
struct in_addr a;

int
main (int argc, char **argv)
{
if (argc != 2)
{
fprintf(stderr, "usage: %s hostname\n", argv[0]);
return 1;
}
he = gethostbyname (argv[1]);
if (he)
{
printf("name: %s\n", he->h_name);
while (*he->h_aliases)
printf("alias: %s\n", *he->h_aliases++);
while (*he->h_addr_list)
{
bcopy(*he->h_addr_list++, (char *) &a, sizeof(a));
printf("address: %s\n", inet_ntoa(a));
}
}
else
herror(argv[0]);
return 0;
}


can any one please explain me this program....

struct hostent *he;
struct in_addr a;

what these two structures are? waht they will do?

You will need to find the structure definitions, this will tell you what elements are within the structure. This in turn will give you the answer.