Initial commit.

15 files changed, 994 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..3912109
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+These restrictions translate to certain responsibilities for you if you
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+
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+
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+
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+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+
+Activities other than copying, distribution and modification are not
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+
+  1. You may copy and distribute verbatim copies of the Program's
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+
+You may charge a fee for the physical act of transferring a copy, and
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+  2. You may modify your copy or copies of the Program or any portion
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+
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+
+    c) If the modified program normally reads commands interactively
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+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
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+Thus, it is not the intent of this section to claim rights or contest
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+In addition, mere aggregation of another work not based on the Program
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+  3. You may copy and distribute the Program (or a work based on it,
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+
+  4. You may not copy, modify, sublicense, or distribute the Program
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+  5. You are not required to accept this License, since you have not
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+prohibited by law if you do not accept this License.  Therefore, by
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+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
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+
+  6. Each time you redistribute the Program (or any work based on the
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+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
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+
+It is not the purpose of this section to induce you to infringe any
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+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
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+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
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+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/README b/README
new file mode 100644
index 0000000..5959e2e
--- /dev/null
+++ b/README
@@ -0,0 +1,5 @@
+This is one of my first personal projects I've been working on. It is so old
+that looking at the code gives me creeps :D. Back in the day (when I was
+building a hacker personality :)) I was amazed by networking, so I wrote netdt
+- a LAN scanner that uses ARP protocol to find which hosts are up. Code
+compiles only on Linux and you will need root privileges to run it.
diff --git a/src/Makefile b/src/Makefile
new file mode 100644
index 0000000..23291a7
--- /dev/null
+++ b/src/Makefile
@@ -0,0 +1,18 @@
+CC=gcc
+CFLAGS+=-O2 -Wall -s
+OBJS=netdt.o arp.o iface.o param.o network.o
+
+all: $(OBJS)
+	$(CC) -I./includes $(CFLAGS) -o netdt $(OBJS)
+netdt.o: netdt.c ./includes/netdt.h ./includes/defs.h
+	$(CC) -I./includes $(CFLAGS) -c -o netdt.o netdt.c
+arp.o: arp.c ./includes/arp.h ./includes/defs.h
+	$(CC) -I./includes $(CFLAGS) -c -o arp.o arp.c
+iface.o: iface.c ./includes/iface.h
+	$(CC) -I./includes $(CFLAGS) -c -o iface.o iface.c
+param.o: param.c ./includes/param.h
+	$(CC) -I./includes $(CFLAGS) -c -o param.o param.c
+network.o: network.c ./includes/network.h
+	$(CC) -I./includes $(CFLAGS) -c -o network.o network.c
+clean:
+	rm -rf netdt $(OBJS)
diff --git a/src/arp.c b/src/arp.c
new file mode 100644
index 0000000..7ad7555
--- /dev/null
+++ b/src/arp.c
@@ -0,0 +1,145 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+ 
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/ether.h>
+#include <netinet/if_ether.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netpacket/packet.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "netdt.h"
+#include "defs.h"
+#include "param.h"
+#include "iface.h"
+#include "network.h"
+
+void arp_generate_packet(struct in_addr, struct in_addr, struct ether_addr, u_int8_t *);
+
+int arp_init(int argc, char **argv)
+{
+	PDEBUG("arp_init called\n");
+	
+	extern struct param param;
+	struct in_addr sip, tip, netmask, tmp;
+	int sock_fd;
+	struct sockaddr_ll saddr_ll;
+	socklen_t sa_size = sizeof(struct sockaddr_ll);
+	struct ether_addr mac;
+	struct ether_arp *arp_header;
+	u_int8_t packet[sizeof(struct ether_header) + sizeof(struct ether_arp)];
+	//printf("%d\n", sizeof(packet)); exit(0);
+	
+	/* ETH_ALEN, ARPHDR_ETHER, ETHERTYPE_ARP */
+
+	if ( (sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ARP))) == -1) {
+		PDEBUG("ERROR: socket() failed\n");
+		fprintf(stderr, "Error: can't create socket\n");
+		exit(1);
+	}
+	if (fcntl(sock_fd, F_SETFL, O_NONBLOCK) == -1) {
+		PDEBUG("ERROR: fcntl() failed\n");
+		fprintf(stderr, "Error: can't make socket non-blocking\n");
+		close(sock_fd);
+		exit(1);
+	}
+	
+	iface_init(sock_fd, param.iface);
+
+	if ( (saddr_ll.sll_ifindex = iface_get_index()) == -1) {
+		fprintf(stderr, "Error: no such device %s\n", param.iface);
+		close(sock_fd);
+		exit(1);
+	}
+
+	/*
+	XXX
+	po situ veiksmu reiketu atlikti 
+	patikrinima ar yra teisingas IP adresas
+	*/
+	iface_get_ip(&sip);
+	iface_get_netmask(&netmask);
+	iface_get_mac(&mac);
+	
+	saddr_ll.sll_family = PF_PACKET;
+	saddr_ll.sll_halen = ETH_ALEN;
+	memset(&saddr_ll.sll_addr, 0, ETH_ALEN);
+	
+	net_calc_network(sip, netmask);
+	tip.s_addr = sip.s_addr & netmask.s_addr;
+	arp_header = (struct ether_arp*)(packet + sizeof(struct ether_header));
+	
+	fprintf(stdout, "Discovering network with %s/%s\n\n", inet_ntoa(sip), ether_ntoa(&mac));
+	
+	while ( (tip.s_addr = net_next_ip(tip)) != 0) {
+		//printf("%s\n", inet_ntoa(tip));
+		memset(packet, 0, sizeof(packet));
+		arp_generate_packet(sip, tip, mac, packet);
+		sendto(sock_fd, &packet, 42, 0, (struct sockaddr*)&saddr_ll, sizeof(struct sockaddr_ll));
+		usleep(param.packet_delay * 100);
+		if (recvfrom(sock_fd, &packet, 42, 0, (struct sockaddr*)&saddr_ll, &sa_size) == 42) {
+			if (arp_header->arp_op == htons(ARPOP_REPLY)) {
+				memcpy((void*)&tmp, (void*)&arp_header->arp_spa, 4);
+				fprintf(stdout, "%-15s %s\n", inet_ntoa(tmp),
+						ether_ntoa((struct ether_addr*)&arp_header->arp_sha));
+			}
+		}
+	}
+	return (0);
+}
+
+void arp_generate_packet(struct in_addr sip, struct in_addr tip, struct ether_addr smac, u_int8_t *packet)
+{
+	struct ether_header *eth_header;
+	struct ether_arp *arp_header;
+	
+	eth_header = (struct ether_header*)packet;
+	memset((void*)&eth_header->ether_dhost, 0xff, ETH_ALEN);	/* broadcast */
+	memcpy((void*)&eth_header->ether_shost, (void*)&smac.ether_addr_octet, ETH_ALEN);
+	eth_header->ether_type = htons(ETHERTYPE_ARP);
+	
+	arp_header = (struct ether_arp*)(packet + sizeof(struct ether_header));
+	arp_header->arp_hrd = htons(ARPHRD_ETHER);
+	arp_header->arp_pro = htons(ETHERTYPE_IP);
+	arp_header->arp_hln = ETH_ALEN;
+	arp_header->arp_pln = 4; /* reikia susiziureti ar nera kokios konstantos */
+	arp_header->arp_op = htons(ARPOP_REQUEST);
+	memcpy((void*)arp_header->arp_sha, (void*)&smac.ether_addr_octet, ETH_ALEN);
+	memcpy((void*)arp_header->arp_spa, (void*)&sip.s_addr, 4);
+	memcpy((void*)arp_header->arp_tpa, (void*)&tip.s_addr, 4);
+}
+
+void arp_usage(char *pname)
+{
+	fprintf(stderr, "The Network Discovery Tool " PROGRAM_VERSION " by " PROGRAM_AUTHOR "\n"
+			"Usage: %s arp <options>\n"
+					"Options:\n"
+					" -i <if>   Network interface\n"
+					" -t <time> Delay between packets\n"
+					" -h        Help screen\n"
+					, pname);
+	exit(0);
+}
diff --git a/src/iface.c b/src/iface.c
new file mode 100644
index 0000000..8c67218
--- /dev/null
+++ b/src/iface.c
@@ -0,0 +1,119 @@
+/* 
+ * The Network Discovery Tool
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Ultimate Network Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <netinet/ether.h>
+#include "iface.h"
+#include "defs.h"
+
+struct ifreq iface;
+
+struct interface
+{
+	int index,
+	    mtu,
+	    metric;
+	short flags;
+	struct in_addr ip, netmask, broadcast;
+	struct ether_addr mac;
+	
+} interface;
+	
+void iface_init(int socket, char *name)
+{
+	PDEBUG("iface_init() called\n");
+	memset(&iface, 0, sizeof(struct ifreq));
+	strncpy(iface.ifr_name, name, strlen(name));
+	
+	if (ioctl(socket, SIOCGIFINDEX, &iface) == -1)
+		interface.index = -1;
+	else {
+		interface.index = iface.ifr_ifindex;
+
+		if (ioctl(socket, SIOCGIFADDR, &iface) != -1)
+			//memcpy(&iface_ip, &(((struct sockaddr_in * )&iface.ifr_addr)->sin_addr), 4);
+			interface.ip = ((struct sockaddr_in * )&iface.ifr_addr)->sin_addr;
+
+		if (ioctl(socket, SIOCGIFNETMASK, &iface) != -1)
+			//memcpy(&iface_nmask, &(((struct sockaddr_in * )&iface.ifr_netmask)->sin_addr), 4);
+			interface.netmask = ((struct sockaddr_in * )&iface.ifr_netmask)->sin_addr;
+
+		if (ioctl(socket, SIOCGIFBRDADDR, &iface) != -1)
+			//memcpy(&iface_bcast, &(((struct sockaddr_in * )&iface.ifr_broadaddr)->sin_addr), 4);
+			interface.broadcast = ((struct sockaddr_in * )&iface.ifr_broadaddr)->sin_addr;
+
+		if (ioctl(socket, SIOCGIFHWADDR, &iface) != -1)
+			memcpy((void*)interface.mac.ether_addr_octet, (void*)&iface.ifr_hwaddr.sa_data, 6);
+
+		if (ioctl(socket, SIOCGIFMTU, &iface) != -1)
+			interface.mtu = iface.ifr_mtu;
+		
+		if (ioctl(socket, SIOCGIFFLAGS, &iface) != -1)
+			interface.flags = iface.ifr_flags;
+
+		if (ioctl(socket, SIOCGIFMETRIC, &iface) != -1)
+			interface.metric = iface.ifr_metric;
+	}
+	PDEBUG("iface_init() ended\n");
+}
+
+int inline iface_get_index()
+{
+	return (interface.index);
+}
+
+int inline iface_get_mtu()
+{
+	return (interface.mtu);
+}
+
+int inline iface_get_metric()
+{
+	return (interface.metric);
+}
+
+short inline iface_get_flags()
+{
+	return (interface.flags);
+}
+
+void inline iface_get_ip(struct in_addr *ip)
+{
+	(*ip) = interface.ip;
+}
+
+void inline iface_get_netmask(struct in_addr *netmask)
+{
+	(*netmask) = interface.netmask;
+}
+
+void inline iface_get_broadcast(struct in_addr *broadcast)
+{
+	(*broadcast) = interface.broadcast;
+}
+
+void inline iface_get_mac(struct ether_addr *mac)
+{
+	(*mac) = interface.mac;
+}
diff --git a/src/includes/arp.h b/src/includes/arp.h
new file mode 100644
index 0000000..d012894
--- /dev/null
+++ b/src/includes/arp.h
@@ -0,0 +1,27 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#ifndef __NETDT_ARP_H__
+#define __NETDT_ARP_H__ 1
+
+int arp_init(int, char **);
+void arp_usage(char *);
+
+#endif
diff --git a/src/includes/defs.h b/src/includes/defs.h
new file mode 100644
index 0000000..ac8a07c
--- /dev/null
+++ b/src/includes/defs.h
@@ -0,0 +1,31 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#ifndef __NETDT_DEFS_H__
+#define __NETDT_DEFS_H__ 1
+
+#undef PDEBUG
+#ifdef DEBUG
+#define PDEBUG(format, args...) fprintf(stderr, "DEBUG:%s:%d " format, __FILE__, __LINE__, ## args)
+#else
+#define PDEBUG(format, args...)
+#endif
+
+#endif
diff --git a/src/includes/iface.h b/src/includes/iface.h
new file mode 100644
index 0000000..da2f86a
--- /dev/null
+++ b/src/includes/iface.h
@@ -0,0 +1,39 @@
+/* 
+ * The Network Discovery Tool
+ * Copyright (C) 2005 Virtual Pointer
+ * 
+ * The Ultimate Network Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *                       
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA. 
+ */
+
+#ifndef __NETDT_IFACE_H__
+#define __NETDT_IFACE_H__ 1
+
+/*
+ * /usr/include/bits/ioctls.h
+ */
+
+/* Initialize global interface variables, call first */
+void iface_init(int, char *);
+int inline iface_get_index();
+int inline iface_get_mtu();
+int inline iface_get_metric();
+short inline iface_get_flags();
+void inline iface_get_ip(struct in_addr *);
+void inline iface_get_netmask(struct in_addr *);
+void inline iface_get_broadcast(struct in_addr *);
+void inline iface_get_mac(struct ether_addr *);
+		
+#endif
diff --git a/src/includes/netdt.h b/src/includes/netdt.h
new file mode 100644
index 0000000..3763d37
--- /dev/null
+++ b/src/includes/netdt.h
@@ -0,0 +1,27 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#ifndef __NETDT_H__
+#define __NETDT_H__ 1
+
+#define PROGRAM_VERSION	"0.0.1"
+#define PROGRAM_AUTHOR	"Tadas Vilkeliskis"
+
+#endif
diff --git a/src/includes/network.h b/src/includes/network.h
new file mode 100644
index 0000000..0b6a984
--- /dev/null
+++ b/src/includes/network.h
@@ -0,0 +1,27 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#ifndef __NETDT_NETWORK_H__
+#define __NETDT_NETWORK_H__ 1
+
+void inline net_calc_network(struct in_addr, struct in_addr);
+in_addr_t net_next_ip(struct in_addr);
+
+#endif
diff --git a/src/includes/param.h b/src/includes/param.h
new file mode 100644
index 0000000..bf5789d
--- /dev/null
+++ b/src/includes/param.h
@@ -0,0 +1,33 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#ifndef __NETDT_PARAM_H__
+#define __NETDT_PARAM_H__ 1
+
+struct param
+{
+	char *iface;
+	int flags;
+	unsigned long packet_delay;
+};
+
+int get_opt(int, char **);
+
+#endif
diff --git a/src/netdt.c b/src/netdt.c
new file mode 100644
index 0000000..968b303
--- /dev/null
+++ b/src/netdt.c
@@ -0,0 +1,72 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <string.h>
+#include "defs.h"
+#include "param.h"
+#include "netdt.h"
+#include "arp.h"
+
+void usage(char *);
+void sigh(int);
+
+int main(int argc, char **argv)
+{
+	extern struct param param;
+#ifdef DEBUG
+	int i;
+	for (i = 0; i < argc; i++)
+		PDEBUG("Command line argv[%d] = %s\n", i, argv[i]);
+#endif
+	if (argc < 2) usage(argv[0]);
+
+	signal(SIGQUIT, sigh);
+	signal(SIGTERM, sigh);
+	signal(SIGINT, sigh);
+
+	if (get_opt(argc, argv) == -1) usage(argv[0]);
+	//PDEBUG("%s", param.iface);
+	if (strncmp(argv[1], "arp", 3) == 0) {
+		if ((param.flags & 0xFFFFFFFF) == 0xFFFFFFFF) arp_usage(argv[0]);
+		return (arp_init(argc, argv));
+	} else usage(argv[0]);
+	
+	return (0);
+}
+
+void usage(char *pname)
+{
+	fprintf(stderr, "The Network Discovery Tool " PROGRAM_VERSION " by " PROGRAM_AUTHOR "\n"
+			"Usage: %s <type> <options>\n"
+			"Types:\n"
+			" arp  Network discovery using ARP\n"
+			"Options:\n"
+			" -h   Help screen\n"
+			, pname);
+	exit(0);
+}
+
+void sigh(int type)
+{
+	exit(1);
+}
diff --git a/src/netdt.o b/src/netdt.o
new file mode 100644
index 0000000..1c5bcab
--- /dev/null
+++ b/src/netdt.o
diff --git a/src/network.c b/src/network.c
new file mode 100644
index 0000000..5f0bf42
--- /dev/null
+++ b/src/network.c
@@ -0,0 +1,42 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#include <netinet/in.h>
+
+struct network
+{
+	unsigned long start, end;
+} network;
+
+void inline net_calc_network(struct in_addr ip, struct in_addr netmask)
+{
+	network.start = ip.s_addr & netmask.s_addr; /* sitas isvis niekam nereikalingas, reikia sugalvoti kur i kisti */
+	network.end = ip.s_addr | (~netmask.s_addr);
+}
+
+in_addr_t net_next_ip(struct in_addr curr_ip)
+{
+	unsigned long curr;
+	curr = ntohl(curr_ip.s_addr);
+	if (curr + 1 <= ntohl(network.end)) {
+		curr++;
+		return (htonl(curr));
+	} else return (0);
+}
diff --git a/src/param.c b/src/param.c
new file mode 100644
index 0000000..3c7f5fb
--- /dev/null
+++ b/src/param.c
@@ -0,0 +1,69 @@
+/* 
+ * The Network Discovery Tool.
+ * Copyright (C) 2005 Tadas Vilkeliskis aka vptr (vpointer@gmail.com)
+ *
+ * The Network Discovery Tool is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <limits.h>
+#include <unistd.h>
+#define _GNU_SOURCE
+#include <getopt.h>
+#include "param.h"
+ 
+struct param param;
+
+int get_opt(int argc, char **argv)
+{
+	extern char *optarg;
+	extern int optind, opterr, optopt;
+	int c;
+	
+	optind = 2;
+	
+	param.packet_delay = 90;
+	
+	while ( (c = getopt(argc, argv, "i:t:h")) != -1) {
+		switch (c) {
+			case 'i':
+				param.iface = optarg;
+				break;
+			case 't':
+				param.packet_delay = strtol(optarg, (char**)NULL, 10);
+				if (param.packet_delay == LONG_MIN || param.packet_delay == LONG_MAX) {
+					fprintf(stderr, "Error: incorrect packet delay, using defaults.\n");
+					param.packet_delay = 90;
+				}
+				break;
+			case 'h':
+				param.flags |= 0xFFFFFFFF; /* ijungiam paskutini bita */
+				break;
+			default:
+				//fprintf(stderr, "Unknown option -%c\n", optopt);
+				return (-1);
+				break;
+		}
+	}
+	
+	if (optind - 2 == 0) {
+		fprintf(stderr, "Error: too few arguments\n");
+		return (-1);
+	}
+	
+	return (0);
+}