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Add Timestamp faking strategy

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This commit is contained in:
Vadim Vetrov
2026-01-31 14:54:51 +03:00
parent da650bd09f
commit c9b59f9ce7
8 changed files with 295 additions and 114 deletions
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164
src/args.c
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@@ -159,6 +159,62 @@ static long parse_numeric_option(const char* value) {
return result;
}
static int parse_faking_strategy(char *optarg, int *faking_strategy) {
*faking_strategy = 0;
char *p = optarg;
char *ep = p;
while (1) {
if (*ep == '\0' || *ep == ',') {
if (ep == p) {
if (*ep == '\0')
break;
p++, ep++;
continue;
}
char ep_endsym = *ep;
*ep = '\0';
if (strcmp(p, "randseq") == 0) {
*faking_strategy |= FAKE_STRAT_RAND_SEQ;
} else if (strcmp(p, "ttl") == 0) {
*faking_strategy |= FAKE_STRAT_TTL;
} else if (strcmp(p, "tcp_check") == 0) {
*faking_strategy |= FAKE_STRAT_TCP_CHECK;
} else if (strcmp(p, "pastseq") == 0) {
*faking_strategy |= FAKE_STRAT_PAST_SEQ;
} else if (strcmp(p, "md5sum") == 0) {
*faking_strategy |= FAKE_STRAT_TCP_MD5SUM;
} else if (strcmp(p, "timestamp") == 0) {
*faking_strategy |= FAKE_STRAT_TCP_TS;
} else {
return -1;
}
*ep = ep_endsym;
if (*ep == '\0') {
break;
} else {
p = ep + 1;
ep = p;
}
} else {
ep++;
}
}
if ( CHECK_BITFIELD(*faking_strategy, FAKE_STRAT_PAST_SEQ) &&
CHECK_BITFIELD(*faking_strategy, FAKE_STRAT_RAND_SEQ)) {
lgerr("Strategies pastseq and randseq are incompatible\n");
return -1;
}
return 0;
}
static int parse_udp_dport_range(char *str, struct udp_dport_range **udpr, int *udpr_len) {
int seclen = 1;
const char *p = str;
@@ -297,6 +353,7 @@ enum {
OPT_FAKE_SNI,
OPT_FAKING_TTL,
OPT_FAKING_STRATEGY,
OPT_FAKING_TIMESTAMP_DECREASE,
OPT_FAKE_SNI_SEQ_LEN,
OPT_FAKE_SNI_TYPE,
OPT_FAKE_CUSTOM_PAYLOAD,
@@ -360,6 +417,7 @@ static struct option long_opt[] = {
{"faking-strategy", 1, 0, OPT_FAKING_STRATEGY},
{"fake-seq-offset", 1, 0, OPT_FAKE_SEQ_OFFSET},
{"faking-ttl", 1, 0, OPT_FAKING_TTL},
{"faking-timestamp-decrease", 1, 0, OPT_FAKING_TIMESTAMP_DECREASE},
{"frag", 1, 0, OPT_FRAG},
{"frag-sni-reverse", 1, 0, OPT_FRAG_SNI_REVERSE},
{"frag-sni-faked", 1, 0, OPT_FRAG_SNI_FAKED},
@@ -425,7 +483,8 @@ void print_usage(const char *argv0) {
printf("\t--fake-custom-payload-file=<binary file containing TLS message>\n");
printf("\t--fake-seq-offset=<offset>\n");
printf("\t--faking-ttl=<ttl>\n");
printf("\t--faking-strategy={randseq|ttl|tcp_check|pastseq|md5sum}\n");
printf("\t--faking-timestamp-decrease=<val>\n");
printf("\t--faking-strategy={randseq|ttl|tcp_check|pastseq|md5sum|timestamp}\n");
printf("\t--synfake={1|0}\n");
printf("\t--synfake-len=<len>\n");
printf("\t--frag={tcp,ip,none}\n");
@@ -730,21 +789,11 @@ int yparse_args(struct config_t *config, int argc, char *argv[]) {
sect_config->frag_sni_pos = num;
break;
case OPT_FAKING_STRATEGY:
if (strcmp(optarg, "randseq") == 0) {
sect_config->faking_strategy = FAKE_STRAT_RAND_SEQ;
} else if (strcmp(optarg, "ttl") == 0) {
sect_config->faking_strategy = FAKE_STRAT_TTL;
} else if (strcmp(optarg, "tcp_check") == 0) {
sect_config->faking_strategy = FAKE_STRAT_TCP_CHECK;
} else if (strcmp(optarg, "pastseq") == 0) {
sect_config->faking_strategy = FAKE_STRAT_PAST_SEQ;
} else if (strcmp(optarg, "md5sum") == 0) {
sect_config->faking_strategy = FAKE_STRAT_TCP_MD5SUM;
} else {
if (parse_faking_strategy(
optarg, &sect_config->faking_strategy) < 0) {
goto invalid_opt;
}
break;
break;
case OPT_FAKING_TTL:
num = parse_numeric_option(optarg);
if (errno != 0 || num < 0 || num > 255) {
@@ -753,6 +802,14 @@ int yparse_args(struct config_t *config, int argc, char *argv[]) {
sect_config->faking_ttl = num;
break;
case OPT_FAKING_TIMESTAMP_DECREASE:
num = parse_numeric_option(optarg);
if (errno != 0) {
goto invalid_opt;
}
sect_config->faking_timestamp_decrease = num;
break;
case OPT_FAKE_SEQ_OFFSET:
num = parse_numeric_option(optarg);
if (errno != 0) {
@@ -1033,33 +1090,66 @@ static size_t print_config_section(const struct section_config_t *section, char
case FAKE_PAYLOAD_DEFAULT:
print_cnf_buf("--fake-sni-type=default");
break;
}
switch(section->faking_strategy) {
case FAKE_STRAT_TTL:
print_cnf_buf("--faking-strategy=ttl");
print_cnf_buf("--faking-ttl=%d", section->faking_ttl);
break;
case FAKE_STRAT_RAND_SEQ:
print_cnf_buf("--faking-strategy=randseq");
break;
case FAKE_STRAT_TCP_CHECK:
print_cnf_buf("--faking-strategy=tcp_check");
break;
case FAKE_STRAT_TCP_MD5SUM:
print_cnf_buf("--faking-strategy=md5sum");
break;
case FAKE_STRAT_PAST_SEQ:
print_cnf_buf("--faking-strategy=pastseq");
print_cnf_buf("--fake-seq-offset=%d", section->fakeseq_offset);
break;
}
print_cnf_buf("--seg2delay=%d", section->seg2_delay);
} else {
print_cnf_buf("--fake-sni=0");
}
if (section->fake_sni && section->faking_strategy) {
int show_ttl = 0;
int show_seq_offset = 0;
int show_faking_ts_decr = 0;
print_cnf_raw("--faking-strategy=");
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_TTL)) {
print_cnf_raw("ttl");
print_cnf_raw(",");
show_ttl = 1;
}
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_RAND_SEQ)) {
print_cnf_raw("randseq");
print_cnf_raw(",");
show_ttl = 1;
}
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_TCP_CHECK)) {
print_cnf_raw("tcp_check");
print_cnf_raw(",");
}
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_TCP_MD5SUM)) {
print_cnf_raw("md5sum");
print_cnf_raw(",");
}
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_TCP_TS)) {
print_cnf_raw("timestamp");
print_cnf_raw(",");
show_faking_ts_decr = 1;
}
if (CHECK_BITFIELD(section->faking_strategy, FAKE_STRAT_PAST_SEQ)) {
print_cnf_raw("pastseq");
print_cnf_raw(",");
}
// delete comma and write space
print_cnf_raw("\b ");
if (show_ttl) {
print_cnf_buf("--faking-ttl=%d", section->faking_ttl);
}
if (show_seq_offset) {
print_cnf_buf("--fake-seq-offset=%d", section->fakeseq_offset);
}
if (show_faking_ts_decr) {
print_cnf_buf("--faking-timestamp-decrease=%d",
section->faking_timestamp_decrease);
}
}
} else {
print_cnf_buf("--tls=disabled");
}
@@ -1247,8 +1337,8 @@ int init_section_config(struct section_config_t **section, struct section_config
return ret;
}
def_section->fake_sni_pkt = fake_sni_old;
def_section->fake_sni_pkt_sz = sizeof(fake_sni_old) - 1;
def_section->fake_sni_pkt = fake_sni;
def_section->fake_sni_pkt_sz = sizeof(fake_sni) - 1;
*section = def_section;
return 0;