can anyone tell me what this program does?

[clickshah]

#include <stdlib.h>
#include <stdio.h>
#include <iostream.h>

#define _System __syscall
extern &quot;C&quot;
{
#include &quot;types.h&quot;
#include &quot;netdb.h&quot;
#include &quot;sys/socket.h&quot;
#include &quot;netinet/in.h&quot;
}


void EXCEPTION(int cond, char szMsg[]);

int main(int argc, char* argv[])
{

sockaddr_in host_addr;
hostent *phost_entry;
char szIPAddr[256];
char inp_addr[256];
char inet_ver[256];
int res_code;

// Init .dll and get the version number.
res_code = sock_init();
EXCEPTION(res_code != 0,&quot;EXCEPTION:Sockinit error!&quot;
res_code = getinetversion(inet_ver);
EXCEPTION(res_code != 0,&quot;EXCEPTION:getinetversion error!&quot;
cout << &quot;Inet version: &quot; << inet_ver << endl;

switch(argc)
{
case 1: cout << &quot;Enter the host name: &quot;;
cin >> inp_addr;
break;
case 2: cout << &quot;Looking up &quot; << argv[1] << endl;
strcpy(inp_addr, argv[1]);
break;
default: cout << &quot;Format: prog1.exe [hostname]\n&quot;;
return 1;
}


phost_entry = prog1byname(inp_addr);
EXCEPTION(phost_entry == NULL,&quot;EXCEPTIONrog1byname error!&quot;
cout << &quot;Host name: &quot; << phost_entry->h_name << endl;

bcopy(phost_entry->h_addr, (caddr_t)&host_addr.sin_addr, phost_entry->h_length);
strcpy(szIPAddr, inet_ntoa(host_addr.sin_addr));
cout << &quot;Dotted address: &quot; << szIPAddr << endl;

return 0;
}


void EXCEPTION(int cond, char szMsg[])
{
if(cond)
{
cerr << szMsg <<endl;
exit(1);
}
}

 

[MikeCox]

Returns the IP address of the host name passed into the command line?
Any man willing to sacrifice liberty for security deserves neither liberty nor security.

-Ben Franklin