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--fake-gen option: generate random-filled Fake Packets

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This option is similar to fake-from-hex, but generates number of
packets with random payload.
This commit is contained in:
ValdikSS
2024-09-14 22:35:28 +03:00
parent f0d42129aa
commit 15793fb84f
3 changed files with 34 additions and 0 deletions
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2
README.md
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@@ -67,6 +67,8 @@ Usage: goodbyedpi.exe [OPTION...]
--fake-from-hex <value> Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF). --fake-from-hex <value> Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF).
This option can be supplied multiple times, in this case each fake packet This option can be supplied multiple times, in this case each fake packet
would be sent on every request in the command line argument order. would be sent on every request in the command line argument order.
--fake-gen <value> Generate random-filled fake packets for Fake Request Mode, value of them
(up to 30).
--max-payload [value] packets with TCP payload data more than [value] won't be processed. --max-payload [value] packets with TCP payload data more than [value] won't be processed.
Use this option to reduce CPU usage by skipping huge amount of data Use this option to reduce CPU usage by skipping huge amount of data
(like file transfers) in already established sessions. (like file transfers) in already established sessions.

24
src/fakepackets.c
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@@ -1,4 +1,5 @@
#include <stdio.h> #include <stdio.h>
#define _CRT_RAND_S
#include <stdlib.h> #include <stdlib.h>
#include <stdbool.h> #include <stdbool.h>
#include <ctype.h> #include <ctype.h>
@@ -284,3 +285,26 @@ int fake_load_from_hex(const char *data) {
return fake_add(finaldata, len / 2); return fake_add(finaldata, len / 2);
} }
int fake_load_random(unsigned int count, unsigned int maxsize) {
if (count < 1 || count > sizeof(fakes) / sizeof(*fakes))
return 1;
unsigned int random = 0;
for (unsigned int i=0; i<count; i++) {
unsigned int len = 0;
if (rand_s(&len))
return 1;
len = 8 + (len % maxsize);
unsigned char *data = calloc(len, 1);
for (unsigned int j=0; j<len; j++) {
rand_s(&random);
data[j] = random % 0xFF;
}
if (fake_add(data, len))
return 2;
}
return 0;
}

8
src/goodbyedpi.c
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@@ -189,6 +189,7 @@ static struct option long_options[] = {
{"reverse-frag",no_argument, 0, '(' }, {"reverse-frag",no_argument, 0, '(' },
{"max-payload", optional_argument, 0, '|' }, {"max-payload", optional_argument, 0, '|' },
{"fake-from-hex", required_argument, 0, 'u' }, {"fake-from-hex", required_argument, 0, 'u' },
{"fake-gen", required_argument, 0, 'j' },
{"debug-exit", optional_argument, 0, 'x' }, {"debug-exit", optional_argument, 0, 'x' },
{0, 0, 0, 0 } {0, 0, 0, 0 }
}; };
@@ -946,6 +947,11 @@ int main(int argc, char *argv[]) {
printf("WARNING: bad fake HEX value %s\n", optarg); printf("WARNING: bad fake HEX value %s\n", optarg);
} }
break; break;
case 'j': // --fake-gen
if (fake_load_random(atoub(optarg, "Fake generator parameter error!"))) {
puts("WARNING: fake generator has failed!");
}
break;
case 'x': // --debug-exit case 'x': // --debug-exit
debug_exit = true; debug_exit = true;
break; break;
@@ -997,6 +1003,8 @@ int main(int argc, char *argv[]) {
" --fake-from-hex <value> Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF).\n" " --fake-from-hex <value> Load fake packets for Fake Request Mode from HEX values (like 1234abcDEF).\n"
" This option can be supplied multiple times, in this case each fake packet\n" " This option can be supplied multiple times, in this case each fake packet\n"
" would be sent on every request in the command line argument order.\n" " would be sent on every request in the command line argument order.\n"
" --fake-gen <value> Generate random-filled fake packets for Fake Request Mode, value of them\n"
" (up to 30).\n"
" --max-payload [value] packets with TCP payload data more than [value] won't be processed.\n" " --max-payload [value] packets with TCP payload data more than [value] won't be processed.\n"
" Use this option to reduce CPU usage by skipping huge amount of data\n" " Use this option to reduce CPU usage by skipping huge amount of data\n"
" (like file transfers) in already established sessions.\n" " (like file transfers) in already established sessions.\n"