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Update faking strategies

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Use random ip4 id for frags, use sequential ip4 id for fakes
This commit is contained in:
Vadim Vetrov
2024-10-12 12:19:33 +03:00
parent 30bc3a8d3f
commit e9b033ccca
14 changed files with 397 additions and 270 deletions
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81
utils.h
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@@ -2,6 +2,7 @@
#define UTILS_H
#include "types.h"
#include "config.h"
#define IP4VERSION 4
#define IP6VERSION 6
@@ -101,6 +102,45 @@ int set_tcp_checksum(struct tcphdr *tcph, void *iph, uint32_t iphb_len);
void z_function(const char *str, int *zbuf, size_t len);
/**
* Shifts data left delta bytes. Fills delta buffer with zeroes.
*/
void shift_data(uint8_t *data, uint32_t dlen, uint32_t delta);
struct failing_strategy {
unsigned int strategy;
uint8_t faking_ttl;
uint32_t randseq_offset;
};
struct fake_type {
#define FAKE_PAYLOAD_RANDOM 0
#define FAKE_PAYLOAD_DATA 1
// In default mode all other options will be skipped.
#define FAKE_PAYLOAD_DEFAULT 2
int type;
// Length of the final fake message.
// Pass 0 in RANDOM mode to make it random
uint16_t fake_len;
// Payload of the fake message of fake_len length.
// Will be omitted in RANDOM mode.
const char *fake_data;
unsigned int sequence_len;
// If non-0 the packet send will be delayed for n milliseconds
unsigned int seg2delay;
// faking strategy of the fake packet.
// Does not support bitmask, pass standalone strategy.
// Pass 0 if you don't want any faking procedures.
struct failing_strategy strategy;
};
/**
* Invalidates the raw packet. The function aims to invalid the packet
@@ -108,7 +148,46 @@ void z_function(const char *str, int *zbuf, size_t len);
*
* Does not support bitmask, pass standalone strategy.
*/
int fail_packet(unsigned int strategy, uint8_t *payload, uint32_t *plen, uint32_t avail_buflen);
int fail_packet(struct failing_strategy strategy, uint8_t *payload, uint32_t *plen, uint32_t avail_buflen);
/**
* Shifts the payload right and pushes zeroes before it. Useful for TCP TLS faking.
*/
int seqovl_packet(uint8_t *payload, uint32_t *plen, uint32_t seq_delta);
static inline struct failing_strategy args_default_failing_strategy(void) {
struct failing_strategy fl_strat = {
.strategy = (unsigned int)config.faking_strategy,
.faking_ttl = config.faking_ttl,
.randseq_offset = (uint32_t)config.fakeseq_offset
};
return fl_strat;
}
static inline struct fake_type args_default_fake_type(void) {
struct fake_type f_type = {
.sequence_len = config.fake_sni_seq_len,
.strategy = args_default_failing_strategy(),
};
switch (config.fake_sni_type) {
case FAKE_PAYLOAD_RANDOM:
f_type.type = FAKE_PAYLOAD_RANDOM;
break;
case FAKE_PAYLOAD_CUSTOM:
f_type.type = FAKE_PAYLOAD_CUSTOM;
f_type.fake_data = config.fake_custom_pkt;
f_type.fake_len = config.fake_custom_pkt_sz;
break;
default:
f_type.type = FAKE_PAYLOAD_CUSTOM;
f_type.fake_data = config.fake_sni_pkt;
f_type.fake_len = config.fake_sni_pkt_sz;
}
return f_type;
}
#endif /* UTILS_H */