Provided by: libdumbnet-dev_1.8-1.3_i386 bug

NAME

     dumbnet - dumb networking library test program

SYNOPSIS

     dumbnet command args [...]

DESCRIPTION

     dumbnet is a simple test program for the dumbnet(3) library. It can be
     used to compose and transmit network datagrams as a Unix-style filter
     (e.g. reading from or writing to files and pipes) or modify the local
     system network 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
          standard 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
          standard output. A port may be specified by name or hex, octal, or
          decimal 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
          standard output. A port may be specified by name or hex, octal, or
          decimal 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
          number. 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:

           dumbnet 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" | \
           dumbnet udp sport 555 dport 666 | \
           dumbnet ip proto udp src 1.2.3.4 dst 5.6.7.8 | dumbnet send

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

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

     Send a fragmented ping packet:

           # Create ping packet with IP header, to set ICMP checksum
           echo "monkey monkey monkey monkey" | dumbnet icmp type 8 code 0 | \
           dumbnet 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
           dumbnet ip id 1 off 0+ proto icmp src 1.2.3.4 dst 5.6.7.8 < p.aa | \
           dumbnet send
           dumbnet ip id 1 off 24 proto icmp src 1.2.3.4 dst 5.6.7.8 < p.ab | \
           dumbnet send

SEE ALSO

     dumbnet(3)

AUTHORS

     Dug Song 〈dugsong@monkey.org