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1. getting the network interface information and default gateway information ??

hi,
  iam trying to get the network interface information and the default
information.After doing some googling i found out the relevant
structures and the ioctl calls for getting the interfaces information(
i suppose i have all that right).
struct ifconf(and using the ioctl SIOCGIFCONF).
there is another structure
struct ifreq
but i dont think i need that one.

Now how do i do to get the interface address(aliases also).i have
written a small program, but dont know where iam going wrong.the code
is

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <net/if.h>
#include <netinet/in.h>

int
main(int argc, char* argv[])
{
    struct ifconf ifc;
    struct ifreq *ifr;
    struct sockaddr_in *sin;
    char buf[128];

    if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        perror("socket");
        return 1;
    }

    ifc.ifc_buf = buf;
    ifc.ifc_len = sizeof(buf);
    if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
        perror("ioctl SIOCGIFCONF");
        return 1;
    }

    ifc.ifc_len /= sizeof(struct ifreq);
    for (i=0; i<ifc.ifc_len; i++) {
        ifr = (struct ifreq *) &ifc.ifc_req[i];
        sin = (struct sockaddr_in *) &ifr->ifr_addr;
        printf("%s \n",sin->sin_addr);
        }
    }
    return 0;

And how can i get the default gateway address within my program.

any help will be highly appreciated.

thanks
rohit

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