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/*************************************************************************
 * (C) 2010 AITNET - Sofia/Bulgaria - <office@aitbg.com>
 *  by Michael Pounov <misho@aitbg.com>
 *
 * $Author: misho $
 * $Id: get1steth.c,v 1.4.2.1 2013/10/14 07:11:04 misho Exp $
 *
 *************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"
#include "get1steth.h"


char szIface[STRSIZ];
int Verbose;
extern char compiled[], compiledby[], compilehost[];


static void
Usage()
{
	printf("-= GET_FIRST_ETHERNET =- Get First Ethernet Interface tool\n"
		"=== %s === %s@%s ===\n\n"
		"Syntax: get1steth [option] [custom_first_interface]\n\n"
		"\t-v\t\tVerbose (more -v more verbosity)\n"
		"\t-g\t\tOnly get first interface, print and exit ...\n"
		"\n", compiled, compiledby, compilehost);
}

#ifdef HAVE_KLDNEXT
static int
kldLoad()
{
	struct module_stat mstat;
	register int i, j;
	u_char flg = 0;

	memset(&mstat, 0, sizeof mstat);
	mstat.version = sizeof mstat;
	for (i = kldnext(0); i > 0; i = kldnext(i))
		for (j = kldfirstmod(i); j > 0; j = modfnext(j)) {
			if (modstat(j, &mstat) == -1)
				continue;

			if (!strncmp(MODVLAN, mstat.name, sizeof MODVLAN)) {
				flg = 1;
				break;
			}
		}
	if (flg)
		return 0;

	if (kldload(MODVLAN) == -1)
		return -1;

	return 1;
}
#endif

// -------------------------------

int
main(int argc, char **argv)
{
	char ch, GetOnly = 0;
	struct ifaddrs *ifa, *ifp;
	struct sockaddr_dl *sdl;
	struct sockaddr_in *sin;
	struct ifreq ifr;
	struct vlanreq vlr;
	struct ifaliasreq ifra;
	struct ifmediareq ifmr;
	int s;

	while ((ch = getopt(argc, argv, "hvg")) != -1)
		switch (ch) {
			case 'g':
				GetOnly = 1;
				break;
			case 'v':
				Verbose++;
				break;
			case 'h':
			default:
				Usage();
				return 1;
		}
	argc -= optind;
	argv += optind;

	openlog("get1steth", LOG_CONS | LOG_PERROR, LOG_USER);

	if (argc) {
		strlcpy(szIface, *argv, sizeof szIface);
		VERB(1) syslog(LOG_NOTICE, "Info:: Get CUSTOM first interface %s\n", szIface);
	} else {
		s = socket(PF_INET, SOCK_DGRAM, 0);
		if (-1 == s) {
			syslog(LOG_ERR, "Error:: socket(INET) #%d - %s\n", errno, strerror(errno));
			closelog();
			return 1;
		}

		getifaddrs(&ifa);
		for (ifp = ifa; ifp; ifp = ifp->ifa_next) {
			if (PF_LINK == ifp->ifa_addr->sa_family && 
					IFT_ETHER == ((struct sockaddr_dl*) ifp->ifa_addr)->sdl_type) {
				memset(&ifmr, 0, sizeof ifmr);
				strlcpy(ifmr.ifm_name, ifp->ifa_name, IFNAMSIZ);
				if (ioctl(s, SIOCGIFMEDIA, &ifmr) == -1) {
					syslog(LOG_ERR, "Error:: media interface=%s ioctl(SIOCGIFMEDIA) #%d - %s\n", 
							ifmr.ifm_name, errno, strerror(errno));
					close(s);
					closelog();
					return 1;
				}

				if (IFM_ETHER == IFM_TYPE(ifmr.ifm_current)) {
					strlcpy(szIface, ifp->ifa_name, sizeof szIface);
					sdl = (struct sockaddr_dl*) ifp->ifa_addr;
					VERB(2) syslog(LOG_NOTICE, "Info:: Get first interface=%s MAC=%s\n", szIface, 
							ether_ntoa((struct ether_addr*) LLADDR(sdl)));
					break;
				}
			}
		}
		freeifaddrs(ifa);

		close(s);
	}
	if (!*szIface) {
		syslog(LOG_NOTICE, "Info:: Ethernet interface not found!!!\n");

		closelog();
		return 1;
	}

	if (GetOnly) {
		printf("%s\n", szIface);

		closelog();
		return 0;
	}

#ifdef HAVE_KLDNEXT
	s = kldLoad();
	if (s == -1) {
		syslog(LOG_ERR, "Error:: kldload(if_vlan) Can`t operate with vlans ...\n");
		return 1;
	} else
		VERB(3) syslog(LOG_NOTICE, "VLAN module ... %s\n", s ? "Loaded" : "Already loaded");
#endif
	/* up parent interface */

	/* create vlan */
	memset(&ifr, 0, sizeof ifr);
	strlcpy(vlr.vlr_parent, szIface, IFNAMSIZ);
	vlr.vlr_tag = MGMT_VTAG;

	strlcpy(ifr.ifr_name, MGMT_IFACE, IFNAMSIZ);
	ifr.ifr_data = (void *) &vlr;

	s = socket(PF_INET, SOCK_DGRAM, 0);
	if (-1 == s) {
		syslog(LOG_ERR, "Error:: socket(INET) #%d - %s\n", errno, strerror(errno));
		closelog();
		return 2;
	}
#ifdef SIOCIFCREATE2
	if (ioctl(s, SIOCIFCREATE2, &ifr) == -1 && errno != EEXIST) {
#else
	if (ioctl(s, SIOCIFCREATE, &ifr) == -1 && errno != EEXIST) {
#endif
		syslog(LOG_ERR, "Error:: Create interface=%s ioctl(SIOCIFCREATE2) #%d - %s\n", 
				MGMT_IFACE, errno, strerror(errno));
		close(s);
		return 2;
	}

	memset(&ifra, 0, sizeof ifra);
#if defined(__FreeBSD__)
	/* rename iface */
	VERB(2) syslog(LOG_NOTICE, "Info:: Created interface=%s\n", MGMT_IFACE);
	ifr.ifr_data = MGMT_NAME;
	if (errno != EEXIST && ioctl(s, SIOCSIFNAME, &ifr) == -1) {
		syslog(LOG_ERR, "Error:: Managment interface=%s ioctl(SIOCSIFNAME) #%d - %s\n", 
				MGMT_NAME, errno, strerror(errno));
		close(s);
		return 2;
	} else
		VERB(2) syslog(LOG_NOTICE, "Info:: Managment interface=%s\n", MGMT_NAME);
	strlcpy(ifra.ifra_name, MGMT_NAME, IFNAMSIZ);
#else
	strlcpy(ifra.ifra_name, MGMT_IFACE, IFNAMSIZ);
#endif

	/* assign address & up */
	sin = (struct sockaddr_in*) &ifra.ifra_addr;
	sin->sin_len = sizeof ifra.ifra_addr;
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = inet_addr(MGMT_ADDR);
	sin = (struct sockaddr_in*) &ifra.ifra_mask;
	sin->sin_len = sizeof ifra.ifra_mask;
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = inet_addr(MGMT_MASK);
	if (ioctl(s, SIOCAIFADDR, &ifra) == -1) {
		syslog(LOG_ERR, "Error:: IP %s ioctl(SIOCAIFADDR) #%d - %s\n", 
				MGMT_ADDR, errno, strerror(errno));
		close(s);
		return 2;
	} else
		VERB(2) syslog(LOG_NOTICE, "Info:: IP %s\n", MGMT_ADDR);

	close(s);
	closelog();
	return 0;
}