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GoodbyeDPI
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Update goodbyedpi.c

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SashaXser 2023-11-14 12:11:50 +04:00 committed by GitHub
parent 7724fff4e2
commit 3f4a99cc54
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 7 additions and 4 deletions
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src/goodbyedpi.c
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@ -390,14 +390,15 @@ static int find_header_and_get_info(const char *pktdata, unsigned int pktlen,
*/
static int extract_sni(const char *pktdata, unsigned int pktlen,
char **hostnameaddr, unsigned int *hostnamelen) {
unsigned int ptr = 0;
const unsigned char *d = (const unsigned char *)pktdata;
const unsigned char *hnaddr = NULL;
size_t hnlen = 0;
int hnlen = 0;
for (size_t ptr = 0; ptr + 8 < pktlen; ptr++) {
while (ptr + 8 < pktlen) {
if (d[ptr] == '\0' && d[ptr+1] == '\0' && d[ptr+2] == '\0' &&
d[ptr+4] == '\0' && d[ptr+6] == '\0' && d[ptr+7] == '\0' &&
d[ptr+3] - d[ptr+5] == 2 && d[ptr+5] - d[ptr+8] == 3)
(d[ptr+3] ^ d[ptr+5]) == 2 && (d[ptr+5] ^ d[ptr+8]) == 3)
{
hnaddr = &d[ptr+9];
hnlen = d[ptr+8];
@ -406,7 +407,7 @@ static int extract_sni(const char *pktdata, unsigned int pktlen,
return FALSE;
}
for (size_t i = 0; i < hnlen; i++) {
for (int i = 0; i < hnlen; i++) {
if (!((hnaddr[i] >= '0' && hnaddr[i] <= '9') ||
(hnaddr[i] >= 'a' && hnaddr[i] <= 'z') ||
hnaddr[i] == '.' || hnaddr[i] == '-'))
@ -419,12 +420,14 @@ static int extract_sni(const char *pktdata, unsigned int pktlen,
*hostnamelen = (unsigned int)hnlen;
return TRUE;
}
ptr++;
}
return FALSE;
}
static inline void change_window_size(const PWINDIVERT_TCPHDR ppTcpHdr, unsigned int size) {
if (size >= 1 && size <= 0xFFFFu) {
ppTcpHdr->Window = htons((u_short)size);