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Code Issues Releases Wiki Activity

Decode TCP window scale option

This commit is contained in:
M66B 2016-03-03 12:40:05 +01:00
parent a6bbb1b1a2
commit fe5f9370a3
1 changed files with 6 additions and 2 deletions
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8
app/src/main/jni/netguard/tcp.c
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@ -426,6 +426,7 @@ jboolean handle_tcp(const struct arguments *args,
// Decode options
// http://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-parameters-1
uint16_t mss = 0;
uint8_t ws = 0;
int optlen = tcpoptlen;
uint8_t *options = tcpoptions;
while (optlen > 0) {
@ -434,9 +435,12 @@ jboolean handle_tcp(const struct arguments *args,
if (kind == 0) // End of options list
break;
if (kind == 2)
if (kind == 2 && len == 4)
mss = ntohs(*((uint16_t *) (options + 2)));
else if (kind == 3 && len == 3)
ws = *(options + 2);
if (kind == 1) {
optlen--;
options++;
@ -447,7 +451,7 @@ jboolean handle_tcp(const struct arguments *args,
}
}
log_android(ANDROID_LOG_WARN, "%s new session mss %d", packet, mss);
log_android(ANDROID_LOG_WARN, "%s new session mss %d ws %d", packet, mss, ws);
// Register session
struct tcp_session *syn = malloc(sizeof(struct tcp_session));