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Code Issues Releases Wiki Activity

Decode TCP window scale option

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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 // Decode options
// http://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-parameters-1 // http://www.iana.org/assignments/tcp-parameters/tcp-parameters.xhtml#tcp-parameters-1
uint16_t mss = 0; uint16_t mss = 0;
uint8_t ws = 0;
int optlen = tcpoptlen; int optlen = tcpoptlen;
uint8_t *options = tcpoptions; uint8_t *options = tcpoptions;
while (optlen > 0) { while (optlen > 0) {
@ -434,9 +435,12 @@ jboolean handle_tcp(const struct arguments *args,
if (kind == 0) // End of options list if (kind == 0) // End of options list
break; break;
if (kind == 2) if (kind == 2 && len == 4)
mss = ntohs(*((uint16_t *) (options + 2))); mss = ntohs(*((uint16_t *) (options + 2)));
else if (kind == 3 && len == 3)
ws = *(options + 2);
if (kind == 1) { if (kind == 1) {
optlen--; optlen--;
options++; 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 // Register session
struct tcp_session *syn = malloc(sizeof(struct tcp_session)); struct tcp_session *syn = malloc(sizeof(struct tcp_session));