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DNET(8)			  BSD System Manager's Manual		       DNET(8)

NAME
     dnet — dumb networking library test program

SYNOPSIS
     dnet command args [...]

DESCRIPTION
     dnet is a simple test program for the dnet(3) library. It can be used to
     compose and transmit network datagrams as a Unix-style filter (e.g. read‐
     ing from or writing to files and pipes) or modify the local system net‐
     work configuration (including the ARP cache, firewall ruleset, network
     interfaces, and routing table).

   Payload generation commands
     addr address [...]
	  Convert the address (specified as a hostname, IP address, or MAC
	  address) into its binary representation on standard output.

     hex string [...]
	  Convert the C-style escaped string (shellcode, for instance) into
	  its binary representation on standard output.

     rand len
	  Write len random bytes to standard output.

   Packet encapsulation commands
     eth [type type] [src mac] [dst mac]
	  Prepend the data read from standard input with an Ethernet header on
	  standard output. The Ethernet type may be specified as ‘arp’, ‘ip’,
	  or as a hex, octal, or decimal number.

     arp [op op] [sha mac] [spa host] [tha mac] [tpa host]
	  Prepend the data read from standard input with an ARP header on
	  standard output. The ARP op may be specified as ‘req’, ‘rep’,
	  ‘revreq’, ‘revrep’, or as a hex, octal, or decimal number.

     ip [tos num] [id num] [off offset] [ttl num] [proto protocol] [src host]
	  [dst dst]
	  Prepend the data read from standard input with an IP header on stan‐
	  dard output. The fragmentation offset may be specified as a decimal
	  number (optionally concatenated with ‘+’ to indicate more fragments)
	  or as a hex number. The protocol may be specified by name, or as a
	  hex, octal, or decimal number.

     icmp [type num] [code num]
	  Prepend the data read from standard input with an ICMP header on
	  standard output.

     tcp [sport port] [dport port] [flags flags] [seq num] [ack num] [win num]
	  [urp num]
	  Prepend the data read from standard input with a TCP header on stan‐
	  dard output. A port may be specified by name or hex, octal, or deci‐
	  mal number. The TCP flags may be specified as some combination of
	  the characters in the set ‘SAFRPU’ or as a hex number.

     udp [sport port] [dport port]
	  Prepend the data read from standard input with a UDP header on stan‐
	  dard output. A port may be specified by name or hex, octal, or deci‐
	  mal number.

   Packet transmission commands
     send [device]
	  Read a packet from standard input and send it over the network. If
	  no device is specified, the packet is assumed to be an IP datagram
	  and routed to its destination. Otherwise, the packet is assumed to
	  be an Ethernet frame and is transmitted on the specified interface.

   Kernel interface commands
     arp show
	  Display the kernel ARP cache.

     arp get host
	  Display the kernel ARP entry for host.

     arp add host mac
	  Add an ARP entry mapping the mac address for host.

     arp delete host
	  Delete the ARP entry for host.

     fw show
	  Display the kernel firewall ruleset.

     fw add|delete action direction device protocol src[:port[-max]]
	  dst[:port[-max]] [type[/code]]
	  Add a rule to or delete a rule from the active firewall ruleset. The
	  action must be either ‘allow’ or ‘block’.  The direction must be
	  either ‘in’ or ‘out’.	 The device may specify an interface name, or
	  ‘any’.  The protocol may be specified by name, or as a decimal num‐
	  ber. For TCP and UDP protocols, a port (or range, if specified with
	  a max value) may be specified in decimal and appended to the source
	  and/or destination address. For ICMP, a type (and optional code) may
	  be specified in decimal.

     intf show
	  Display the configuration of all network interfaces.

     intf get device
	  Display the configuration for the interface specified by device.

     intf set device [alias host] [dst host] [inet host] [link mac] [up|down]
	  [arp|noarp]
	  Configure the interface specified by device.

     route show
	  Display the kernel routing table.

     route get dst
	  Display the route for the destination dst, specified as a hostname,
	  IP address, or network prefix in CIDR notation.

     route add dst gw
	  Add a route for the destination dst through the gateway gw.

     route delete dst
	  Delete the route for the destination dst.

EXAMPLES
     Send a UDP datagram containing random shellcode:

	   dnet hex "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89" \
	   "\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80" \
	   "\x31\xdb\x89\xd8\x40\xcd\x80\xe8\xdc\xff\xff\xff/bin/sh" | \
	   dnet udp sport 555 dport 666 | \
	   dnet ip proto udp src 1.2.3.4 dst 5.6.7.8 | dnet send

     Save an ARP request in a file and send it twice:

	   dnet arp op req sha 0:d:e:a:d:0 spa 10.0.0.3 tpa 10.0.0.4 | \
	   dnet eth type arp src 0:d:e:a:d:0 dst ff:ff:ff:ff:ff:ff > arp.pkt
	   dnet send fxp0 < arp.pkt
	   dnet send fxp0 < arp.pkt

     Send a fragmented ping packet:

	   # Create ping packet with IP header, to set ICMP checksum
	   echo "monkey monkey monkey monkey" | dnet icmp type 8 code 0 | \
	   dnet ip proto icmp src 1.2.3.4 dst 5.6.7.8 > ping.pkt

	   # Chop off IP header
	   dd if=ping.pkt of=ping.data bs=20 skip=1

	   # Fragment IP payload
	   split -b 24 ping.data p.

	   # Send fragments
	   dnet ip id 1 off 0+ proto icmp src 1.2.3.4 dst 5.6.7.8 < p.aa | \
	   dnet send
	   dnet ip id 1 off 24 proto icmp src 1.2.3.4 dst 5.6.7.8 < p.ab | \
	   dnet send

SEE ALSO
     dnet(3)

AUTHORS
     Dug Song ⟨dugsong@monkey.org⟩

BSD			       October 17, 2001				   BSD
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