/*

* Copyright (c) 2001-2010 Aaron Turner <aturner at synfin dot net>

* Copyright (c) 2013-2022 Fred Klassen <tcpreplay at appneta dot com> - AppNeta

*

* The Tcpreplay Suite of tools 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 3 of the

* License, or with the authors permission any later version.

*

* The Tcpreplay Suite 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 the Tcpreplay Suite. If not, see <http://www.gnu.org/licenses/>.

*/

flag = {

name = tcpedit;

documentation;

lib-name = tcpedit;

};

flag = {

name = portmap;

value = r;

arg-type = string;

max = 9999;

stack-arg;

descrip = "Rewrite TCP/UDP ports";

doc = <<- EOText

Specify a list of comma delimited port mappings consisting of

colon delimited port number pairs. Each colon delimited port pair

consists of the port to match followed by the port number to rewrite.

Examples:

@example

--portmap=80:8000 --portmap=8080:80 # 80->8000 and 8080->80

--portmap=8000,8080,88888:80 # 3 different ports become 80

--portmap=8000-8999:80 # ports 8000 to 8999 become 80

@end example

EOText;

};

flag = {

name = seed;

flags-cant = fuzz-seed;

value = s;

arg-type = number;

descrip = "Randomize src/dst IPv4/v6 addresses w/ given seed";

max = 1;

doc = <<- EOText

Causes the source and destination IPv4/v6 addresses to be pseudo

randomized but still maintain client/server relationships.

Since the randomization is deterministic based on the seed,

you can reuse the same seed value to recreate the traffic.

EOText;

};

flag = {

name = pnat;

value = N;

arg-type = string;

max = 2;

stack-arg;

flags-cant = srcipmap;

flass-cant = dstipmap;

descrip = "Rewrite IPv4/v6 addresses using pseudo-NAT";

doc = <<- EOText

Takes a comma delimited series of colon delimited CIDR

netblock pairs. Each netblock pair is evaluated in order against

the IP addresses. If the IP address in the packet matches the

first netblock, it is rewritten using the second netblock as a

mask against the high order bits.

IPv4 Example:

@example

--pnat=192.168.0.0/16:10.77.0.0/16,172.16.0.0/12:10.1.0.0/24

@end example

IPv6 Example:

@example

--pnat=[2001:db8::/32]:[dead::/16],[2001:db8::/32]:[::ffff:0:0/96]

@end example

EOText;

};

flag = {

name = srcipmap;

value = S;

arg-type = string;

max = 1;

flags-cant = pnat;

descrip = "Rewrite source IPv4/v6 addresses using pseudo-NAT";

doc = <<- EOText

Works just like the --pnat option, but only affects the source IP

addresses in the IPv4/v6 header.

EOText;

};

flag = {

name = dstipmap;

value = D;

arg-type = string;

max = 1;

flags-cant = pnat;

descrip = "Rewrite destination IPv4/v6 addresses using pseudo-NAT";

doc = <<- EOText

Works just like the --pnat option, but only affects the destination IP

addresses in the IPv4/v6 header.

EOText;

};

flag = {

ifdef = HAVE_CACHEFILE_SUPPORT;

name = endpoints;

value = e;

arg-type = string;

max = 1;

flags-must = cachefile;

descrip = "Rewrite IP addresses to be between two endpoints";

doc = <<- EOText

Takes a pair of colon delimited IPv4/v6 addresses which will be used to rewrite

all traffic to appear to be between the two IP addresses.

IPv4 Example:

@example

--endpoints=172.16.0.1:172.16.0.2

@end example

IPv6 Example:

@example

--endpoints=[2001:db8::dead:beef]:[::ffff:0:0:ac:f:0:2]

@end example

EOText;

};

flag = {

name = tcp-sequence;

arg-type = number;

arg-default = 0;

arg-range = "1->";

descrip = "Change TCP Sequence (and ACK) numbers /w given seed";

doc = <<- EOText

Change all TCP sequence numbers, and related sequence-acknowledgement numbers.

They will be shifted by a random amount based on the provided seed.

EOText;

};

flag = {

name = skipbroadcast;

value = b;

descrip = "Skip rewriting broadcast/multicast IPv4/v6 addresses";

doc = <<- EOText

By default --seed, --pnat and --endpoints will rewrite

broadcast and multicast IPv4/v6 and MAC addresses. Setting this flag

will keep broadcast/multicast IPv4/v6 and MAC addresses from being rewritten.

EOText;

};

flag = {

name = fixcsum;

value = C;

descrip = "Force recalculation of IPv4/TCP/UDP header checksums";

doc = <<- EOText

Causes each IPv4/v6 packet to have their checksums recalculated and

fixed. Automatically enabled for packets modified with @samp{--seed},

@samp{--pnat}, @samp{--endpoints} or @samp{--fixlen}.

EOText;

};

flag = {

name = mtu;

value = m;

arg-type = number;

max = 1;

arg-range = "1->MAX_SNAPLEN";

default = DEFAULT_MTU;

descrip = "Override default MTU length (1500 bytes)";

doc = <<- EOText

Override the default 1500 byte MTU size for determining the maximum padding length

(--fixlen=pad) or when truncating (--mtu-trunc).

EOText;

};

flag = {

name = mtu-trunc;

max = 1;

descrip = "Truncate packets larger then specified MTU";

doc = <<- EOText

Similar to --fixlen, this option will truncate data in packets from Layer 3 and above to be

no larger then the MTU.

EOText;

};

flag = {

name = efcs;

value = E;

descrip = "Remove Ethernet checksums (FCS) from end of frames";

doc = <<- EOText

Note, this option is pretty dangerous! We do not actually check to see if a FCS

actually exists in the frame, we just blindly delete the last 4 bytes. Hence,

you should only use this if you know know that your OS provides the FCS when

reading raw packets.

EOText;

};

flag = {

name = ttl;

descrip = "Modify the IPv4/v6 TTL/Hop Limit";

arg-type = string;

doc = <<- EOText

Allows you to modify the TTL/Hop Limit of all the IPv4/v6 packets. Specify a number to hard-code

the value or +/-value to increase or decrease by the value provided (limited to 1-255).

Examples:

@example

--ttl=10

--ttl=+7

--ttl=-64

@end example

EOText;

};

flag = {

name = tos;

descrip = "Set the IPv4 TOS/DiffServ/ECN byte";

arg-type = number;

arg-range = "0->255";

max = 1;

doc = <<- EOText

Allows you to override the TOS (also known as DiffServ/ECN) value in IPv4.

EOText;

};

flag = {

name = tclass;

descrip = "Set the IPv6 Traffic Class byte";

arg-type = number;

arg-range = "0->255";

max = 1;

doc = <<- EOText

Allows you to override the IPv6 Traffic Class field.

EOText;

};

flag = {

name = flowlabel;

descrip = "Set the IPv6 Flow Label";

arg-type = number;

arg-range = "0->1048575";

max = 1;

doc = <<- EOText

Allows you to override the 20bit IPv6 Flow Label field. Has no effect on IPv4

packets.

EOText;

};

flag = {

name = fixlen;

value = F;

arg-type = string;

descrip = "Pad or truncate packet data to match header length";

max = 1;

doc = <<- EOText

Packets may be truncated during capture if the snaplen is smaller then the

packet. This option allows you to modify the packet to pad the packet back

out to the size stored in the IPv4/v6 header or rewrite the IP header total length

to reflect the stored packet length.

@table @bullet

@item

@var{pad}

Truncated packets will be padded out so that the packet length matches the

IPv4 total length

@item

@var{trunc}

Truncated packets will have their IPv4 total length field rewritten to match

the actual packet length

@item

@var{del}

Delete the packet

EOText;

};

flag = {

name = fuzz-seed;

arg-type = number;

arg-default = 0;

arg-range = "0->";

descrip = "Fuzz 1 in X packets. Edit bytes, length, or emulate packet drop";

doc = <<- EOText

This fuzzing was designed as to test layer 7 protocols such as voip protocols.

It modifies randomly 1 out of X packets (where X = @var{--fuzz-factor}) in order

for stateful protocols to cover more of their code. The random fuzzing actions

focus on data start and end because it often is the part of the data application

protocols base their decisions on.

Possible fuzzing actions list:

* drop packet

* reduce packet size

* edit packet Bytes:

* Not all Bytes have the same probability of appearance in real life.

Replace with 0x00, 0xFF, or a random byte with equal likelihood.

* Not all Bytes have the same significance in a packet.

Replace the start, the end, or the middle of the packet with equal likelihood.

* do nothing (7 out of 8 packets)

EOText;

};

flag = {

name = fuzz-factor;

flags-must = fuzz-seed;

arg-type = number;

arg-default = 8;

arg-range = "1->";

descrip = "Set the Fuzz 1 in X packet ratio (default 1 in 8 packets)";

doc = <<- EOText

Sets the ratio of for @var{--fuzz-seed} option. By default this value is 8,

which means 1 in 8 packets are modified by fuzzing. Note that this ratio is

based on the random number generated by the supplied fuzz seed. Therefore by

default you cannot expect that exactly every eighth packet will be modified.

EOText;

};

#include plugins/dlt_stub.def