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oob2 -> disoob, send only one OOB byte

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This commit is contained in:
ruti 2024-08-16 19:08:22 +03:00
parent 550f2d2f5f
commit db47c7841d
3 changed files with 58 additions and 71 deletions
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51
desync.c
View File

@ -365,13 +365,10 @@ ssize_t send_fake(int sfd, char *buffer,
#endif
ssize_t send_oob(int sfd, char *buffer,
ssize_t n, long pos)
ssize_t n, long pos, char *c)
{
ssize_t size = oob_data.size - 1;
char *data = oob_data.data + 1;
char rchar = buffer[pos];
buffer[pos] = oob_data.data[0];
buffer[pos] = c[1] ? c[0] : 'a';
ssize_t len = send(sfd, buffer, pos + 1, MSG_OOB);
buffer[pos] = rchar;
@ -380,24 +377,12 @@ ssize_t send_oob(int sfd, char *buffer,
uniperror("send");
return -1;
}
wait_send_if_support(sfd);
len--;
if (len != pos) {
return len;
}
if (size) {
wait_send(sfd);
}
for (long i = 0; i < size; i++) {
if (send(sfd, data + i, 1, MSG_OOB) < 0) {
uniperror("send");
if (get_e() == EAGAIN) {
return len;
}
}
if (size != 1) {
wait_send(sfd);
}
}
return len;
}
@ -414,7 +399,7 @@ ssize_t send_disorder(int sfd,
if (len < 0) {
uniperror("send");
}
wait_send_if_support(sfd);
else wait_send_if_support(sfd);
if (setttl(sfd, params.def_ttl, fa) < 0) {
return -1;
@ -424,19 +409,17 @@ ssize_t send_disorder(int sfd,
ssize_t send_late_oob(int sfd, char *buffer,
ssize_t n, long pos, int fa)
ssize_t n, long pos, int fa, char *c)
{
int bttl = 1;
if (setttl(sfd, bttl, fa) < 0) {
return -1;
}
ssize_t len = send_oob(sfd, buffer, n, pos);
ssize_t len = send_oob(sfd, buffer, n, pos, c);
if (len < 0) {
uniperror("send");
}
wait_send_if_support(sfd);
if (setttl(sfd, params.def_ttl, fa) < 0) {
return -1;
}
@ -529,7 +512,7 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
if (offset && pos <= offset) {
continue;
}
else if (pos <= 0 || pos >= n || pos <= lp) {
else if (pos < 0 || pos > n || pos < lp) {
LOG(LOG_E, "split cancel: pos=%ld-%ld, n=%zd\n", lp, pos, n);
break;
}
@ -538,7 +521,7 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
switch (part.m) {
#ifdef FAKE_SUPPORT
case DESYNC_FAKE:
s = send_fake(sfd,
if (pos != lp) s = send_fake(sfd,
buffer + lp, type, pos - lp, fa, &dp);
break;
#endif
@ -549,14 +532,12 @@ ssize_t desync(int sfd, char *buffer, size_t bfsize,
case DESYNC_OOB:
s = send_oob(sfd,
buffer + lp, n - lp, pos - lp);
wait_send_if_support(sfd);
buffer + lp, n - lp, pos - lp, dp.oob_char);
break;
case DESYNC_OOB2:
case DESYNC_DISOOB:
s = send_late_oob(sfd,
buffer + lp, n - lp, pos - lp, fa);
//wait_send_if_support(sfd);
buffer + lp, n - lp, pos - lp, fa, dp.oob_char);
break;
case DESYNC_SPLIT:
@ -628,7 +609,13 @@ ssize_t desync_udp(int sfd, char *buffer, size_t bfsize,
else {
pkt = fake_udp;
}
if (dp->fake_offset) {
if (pkt.size > dp->fake_offset) {
pkt.size -= dp->fake_offset;
pkt.data += dp->fake_offset;
}
else pkt.size = 0;
}
int bttl = dp->ttl ? dp->ttl : 8;
if (setttl(sfd, bttl, fa) < 0) {
return -1;

71
main.c
View File

@ -25,7 +25,6 @@
#define VERSION "12"
char oob_char[1] = "a";
char ip_option[1] = "\0";
struct packet fake_tls = {
@ -34,9 +33,6 @@ struct packet fake_tls = {
fake_http = {
sizeof(http_data), http_data
},
oob_data = {
sizeof(oob_char), oob_char
},
fake_udp = {
sizeof(udp_data), udp_data
};
@ -90,7 +86,7 @@ const char help_text[] = {
" +h - add HTTP Host offset\n"
" -d, --disorder <n[+s]> Split and send reverse order\n"
" -o, --oob <n[+s]> Split and send as OOB data\n"
" -O, --oob2 <n[+s]> Insert OOB data\n"
" -q, --disoob <n[+s]> Split and send reverse order as OOB data\n"
#ifdef FAKE_SUPPORT
" -f, --fake <n[+s]> Split and send fake packet\n"
" -t, --ttl <num> TTL of fake packets, default 8\n"
@ -98,11 +94,11 @@ const char help_text[] = {
" -k, --ip-opt[=f|:str] IP options of fake packets\n"
" -S, --md5sig Add MD5 Signature option for fake packets\n"
#endif
" -R, --fake-offset <n> Fake data start offset\n"
" -O, --fake-offset <n> Fake data start offset\n"
" -l, --fake-data <f|:str> Set custom fake packet\n"
" -n, --tls-sni <str> Change SNI in fake ClientHello\n"
#endif
" -e, --oob-data <f|:str> Set custom OOB data, filename or :string\n"
" -e, --oob-data <str> Set custom OOB data\n"
" -M, --mod-http <h,d,r> Modify HTTP: hcsmix,dcsmix,rmspace\n"
" -r, --tlsrec <n[+s]> Make TLS record at position\n"
" -a, --udp-fake <count> UDP fakes count, default 0\n"
@ -139,7 +135,7 @@ const struct option options[] = {
{"split", 1, 0, 's'},
{"disorder", 1, 0, 'd'},
{"oob", 1, 0, 'o'},
{"oob2", 1, 0, 'O'},
{"disoob", 1, 0, 'q'},
#ifdef FAKE_SUPPORT
{"fake", 1, 0, 'f'},
{"ttl", 1, 0, 't'},
@ -149,7 +145,7 @@ const struct option options[] = {
#endif
{"fake-data", 1, 0, 'l'},
{"tls-sni", 1, 0, 'n'},
{"fake-offset", 1, 0, 'R'},
{"fake-offset", 1, 0, 'O'},
#endif
{"oob-data", 1, 0, 'e'},
{"mod-http", 1, 0, 'M'},
@ -166,28 +162,24 @@ const struct option options[] = {
};
char *parse_cform(const char *str, ssize_t *size)
size_t parse_cform(char *buffer, size_t blen,
const char *str, size_t slen)
{
ssize_t len = strlen(str);
char *d = malloc(len);
if (!d) {
return 0;
}
static char esca[] = {
'r','\r','n','\n','t','\t','\\','\\',
'f','\f','b','\b','v','\v','a','\a', 0
};
ssize_t i = 0, p = 0;
for (; p < len; ++p && ++i) {
for (; p < slen && i < blen; ++p && ++i) {
if (str[p] != '\\') {
d[i] = str[p];
buffer[i] = str[p];
continue;
}
p++;
char *e = esca;
for (; *e; e += 2) {
if (*e == str[p]) {
d[i] = *(e + 1);
buffer[i] = *(e + 1);
break;
}
}
@ -195,14 +187,30 @@ char *parse_cform(const char *str, ssize_t *size)
continue;
}
int n = 0;
if (sscanf(&str[p], "x%2hhx%n", &d[i], &n) == 1
|| sscanf(&str[p], "%3hho%n", &d[i], &n) == 1) {
if (sscanf(&str[p], "x%2hhx%n", &buffer[i], &n) == 1
|| sscanf(&str[p], "%3hho%n", &buffer[i], &n) == 1) {
p += (n - 1);
continue;
}
i--; p--;
}
char *m = realloc(d, i);
return i;
}
char *data_from_str(const char *str, ssize_t *size)
{
ssize_t len = strlen(str);
if (len == 0) {
return 0;
}
char *d = malloc(len);
if (!d) {
return 0;
}
size_t i = parse_cform(d, len, str, len);
char *m = len != i ? realloc(d, i) : 0;
if (i == 0) {
return 0;
}
@ -214,7 +222,7 @@ char *parse_cform(const char *str, ssize_t *size)
char *ftob(const char *str, ssize_t *sl)
{
if (*str == ':') {
return parse_cform(str + 1, sl);
return data_from_str(str + 1, sl);
}
char *buffer = 0;
long size;
@ -424,10 +432,6 @@ void clear_params(void)
free(params.dp);
params.dp = 0;
}
if (oob_data.data != oob_char) {
free(oob_data.data);
oob_data.data = oob_char;
}
}
@ -641,7 +645,7 @@ int main(int argc, char **argv)
case 's':
case 'd':
case 'o':
case 'O':
case 'q':
case 'f':
;
struct part *part = add((void *)&dp->parts,
@ -661,7 +665,7 @@ int main(int argc, char **argv)
break;
case 'o': part->m = DESYNC_OOB;
break;
case 'O': part->m = DESYNC_OOB2;
case 'q': part->m = DESYNC_DISOOB;
break;
case 'f': part->m = DESYNC_FAKE;
}
@ -695,7 +699,7 @@ int main(int argc, char **argv)
dp->md5sig = 1;
break;
case 'R':
case 'O':
val = strtol(optarg, &end, 0);
if (val <= 0 || *end)
invalid = 1;
@ -724,14 +728,11 @@ int main(int argc, char **argv)
break;
case 'e':
if (oob_data.data != oob_char) {
continue;
}
oob_data.data = ftob(optarg, &oob_data.size);
if (!oob_data.data) {
uniperror("read/parse");
val = parse_cform(dp->oob_char, 1, optarg, strlen(optarg));
if (val != 1) {
invalid = 1;
}
else dp->oob_char[1] = 1;
break;
case 'M':

7
params.h
View File

@ -33,7 +33,7 @@ enum demode {
DESYNC_SPLIT,
DESYNC_DISORDER,
DESYNC_OOB,
DESYNC_OOB2,
DESYNC_DISOOB,
DESYNC_FAKE
};
@ -43,7 +43,7 @@ char *demode_str[] = {
"DESYNC_SPLIT",
"DESYNC_DISORDER",
"DESYNC_OOB",
"DESYNC_OOB2",
"DESYNC_DISOOB",
"DESYNC_FAKE"
};
#endif
@ -68,6 +68,7 @@ struct desync_params {
int udp_fake_count;
int fake_offset;
char drop_sack;
char oob_char[2];
int parts_n;
struct part *parts;
@ -113,9 +114,7 @@ extern struct params params;
extern struct packet fake_tls;
extern struct packet fake_http;
extern struct packet oob_data;
extern struct packet fake_udp;
extern char ip_option[1];
#endif