man dumbnet (Administration système) - dumbnet
NAME
SYNOPSIS
DESCRIPTION
is a simple test program for the dumbnet() 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
- Xo
- 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 or as a hex, octal, or decimal number.
- Xo
- 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 or as a hex, octal, or decimal number.
- Xo
- 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.
- Xo
- icmp [type num] [code num] Prepend the data read from standard input with an ICMP header on standard output.
- Xo
- 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 or as a hex number.
- Xo
- 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.
- Xo
- fw add Ns | Ns delete action direction device protocol src Ns [: Ns port[-max]] dst Ns [: Ns port[-max]] [type Ns [/code]] Add a rule to or delete a rule from the active firewall ruleset. The action must be either or The direction must be either or The device may specify an interface name, or 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 .
- Xo
- intf set device [alias host] [dst host] [inet host] [link mac] [up Ns | Ns down] [arp Ns | Ns 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
AUTHORS
Dug Song