#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>

#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <sys/uio.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

#define SIZEOF_ARRAY(array) (sizeof(array)/sizeof(array[0]))

#define PROFILE(X) printtime(X, __FUNCTION__, __LINE__)

static void printtime(const char *s, const char *func, int line)
{
        struct timeval tv;

        if (gettimeofday(&tv, NULL) == 0) {
                printf("DEBUG %10ld.%06ld %s %d: %s\n", tv.tv_sec, tv.tv_usec, func, line, s);
        } else {
                printf("DEBUG                  %s %d: %s\n", func, line, s);
        }
}

int main(void)
{
	char   buf[1024];
	struct ifconf  ifc;
	struct intf_t *intf;         // Interfaces
    struct ifreq  *ifr;
	int    sock;
	int    result;
	
	int    devices = 0;
	char  *ptr;
	
	ifc.ifc_buf = buf;
	ifc.ifc_len = SIZEOF_ARRAY(buf);
	
	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0) {
		perror("Couldn't open socket\n");
		return EXIT_FAILURE;
	}
	
	PROFILE("SIOCGIFCONF start");
	result = ioctl(sock, SIOCGIFCONF, &ifc);
	PROFILE("SIOCGIFCONF end");
	
	ptr = buf;
	while (ptr < buf + ifc.ifc_len) {
		ifr = (struct ifreq *)ptr;
		
		printf("Interface: %s\n", ifr->ifr_name);
		PROFILE("SIOCGIFADDR start");
		result = ioctl(sock, SIOCGIFADDR, ifr);
		PROFILE("SIOCGIFADDR end");
		switch (ifr->ifr_addr.sa_family) {
			/*
			case AF_LINK:
				printf("  Family: AF_LINK\n";
				break;
			*/
			case AF_INET:
				printf("  Family: AF_INET\n");
				printf("  Address: %08x\n", ntohl(((struct sockaddr_in *)(&ifr->ifr_addr))->sin_addr.s_addr));
				
				PROFILE("SIOCGIFNETMASK start");
				result = ioctl(sock, SIOCGIFNETMASK, ifr);
				PROFILE("SIOCGIFNETMASK end");
				printf("  Mask: %08x\n", ntohl(((struct sockaddr_in *)(&ifr->ifr_addr))->sin_addr.s_addr));
				
				PROFILE("SIOCGIFBRDADDR start");
				result = ioctl(sock, SIOCGIFBRDADDR, ifr);
				PROFILE("SIOCGIFBRDADDR end");
				printf("  Broadcast: %08x\n", ntohl(((struct sockaddr_in *)(&ifr->ifr_addr))->sin_addr.s_addr));
				
				PROFILE("SIOCGIFDSTADDR start");
				result = ioctl(sock, SIOCGIFDSTADDR, ifr);
				PROFILE("SIOCGIFDSTADDR end");
				printf("  Dest: %08x\n", ntohl(((struct sockaddr_in *)(&ifr->ifr_addr))->sin_addr.s_addr));
				
				PROFILE("SIOCGIFFLAGS start");
				result = ioctl(sock, SIOCGIFFLAGS, ifr);
				PROFILE("SIOCGIFFLAGS end");
				printf("  Flags: %08x\n", ifr->ifr_flags);
				break;
			case AF_INET6:
				printf("  Family: AF_INET6\n");
				break;
			default:
				printf("  Family: %d\n", ifr->ifr_addr.sa_family);
				break;
		}
		
		ptr += sizeof(struct ifreq);
	}
	
	return EXIT_SUCCESS;
}