need help with the C code.
designing a proxy server.
can't find a function that would return client IP address.
help please.

let me google that for you
http://unixwiz.net/tools/whoamip.html
is this what you had in mind?

some codes here:
http://forums.debian.net/viewtopic.php?t=31673&sid=77365c8c16168343211ec674e17826cc

Thanks Sedif. :-)

wow sedif..didnt know abt let me google that for you, that was nice

http://tinyurl.com/6p2z7d (This just for test)

Dont know much abt C, but got following from http://www.cygwin.com/ml/cygwin/2004-04/msg00894.html, might be of some help.

/* little utility to get the IP address of the machine

- prints the IP address in triple-dotted form xxx.yyy.zzz.www,

or nothing if can't get it.

- this code is a fragment from EpidEm code.

*/

#include <stdio.h>

#include <arpa/inet.h>

#include <netinet/in.h>

#include <unistd.h>

#include <netdb.h>

/*

Returns the IP address of this host.

- if host have more than 1 IP, only 1 (the first) is returned.

- return is in network byte order

- thanks to Doct. Ghini (www.cs.unibo.it/~ghini)

return: 0 if unsuccessful, the IP otherwise

*/

in_addr_t get_my_IP()

{

/* have you ever seen a hostname longer than a screen (80cols)?*/

char name[80]; /*store my hostname*/

struct hostent * hostent_ptr;

int ret;

ret = gethostname (name, 80);

if(ret == -1) {

/*printf ("ERROR gethostname() failed, Errno=%d \nDescription: %s\n", errno,

strerror(errno));*/

return 0;

}


hostent_ptr = gethostbyname(name);


if(hostent_ptr == NULL)

{

/*printf ("ERROR gethostbyname() failed, h_errno=%d \nDescription: %s\n",
h_errno, hstrerror(h_errno));*/

return 0;

}

/*h_addr_list contains IPs of this host in network byte order */

return ((struct in_addr *)hostent_ptr->h_addr_list[0])->s_addr; /*get the
first IP.*/

}

int main()

{

in_addr_t my_ip = get_my_IP();

if (my_ip != 0)

{

struct in_addr temp;

temp.s_addr = my_ip;

printf("%s\n", inet_ntoa(temp));

}

return 0;

}

np
@techGuy: ya read a Digg post on it, cleaver idea.

Yes , gethostbyname( ) does it.

But werent you looking for Client's IP Address? And if you are coding for a Proxy Server, and all you can do is code in that server? I'd suggest you use connection request headers from the clients to find its IP Address.

Can someone know how to crack these array problems please.

 1. Write a program to double the array elements with odd indices?

Eg. Element 1, 2,3,4,5,6,7,8

Soln: 1,6,10,14 <program only double the element with odd indices>

 

2. Find the first element larger than 100.

 

    

thank you

;