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Code Issues Releases Wiki Activity

Native uid retry, ignore unknown sessions

This commit is contained in:
M66B 2016-01-17 16:48:39 +01:00
parent 49b15e261d
commit 12c74b24ab
1 changed files with 21 additions and 15 deletions
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36
app/src/main/jni/netguard/netguard.c
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@ -34,7 +34,8 @@
#define TCPTIMEOUT 300 // seconds ~net.inet.tcp.keepidle
#define TCPTTL 64
#define TCPWINDOW 32768
#define UIDDELAY 10 // milliseconds
#define UIDDELAY 100 // milliseconds
#define UIDTRIES 10
#define MAXPCAP 80
struct arguments {
@ -659,19 +660,22 @@ void handle_ip(JNIEnv *env, jobject instance, const struct arguments *args,
// Get uid
jint uid = -1;
if ((protocol == IPPROTO_TCP && syn) || protocol == IPPROTO_UDP) {
// Sleep 10 ms
// TODO uid retry
usleep(1000 * UIDDELAY);
// Lookup uid
uid = getUid(protocol, version, saddr, sport);
if (uid < 0 && version == 4) {
int8_t saddr128[16];
memset(saddr128, 0, 10);
saddr128[10] = 0xFF;
saddr128[11] = 0xFF;
memcpy(saddr128 + 12, saddr, 4);
uid = getUid(protocol, 6, saddr128, sport);
int tries = 0;
while (tries++ < UIDTRIES && uid < 0) {
// Lookup uid
uid = getUid(protocol, version, saddr, sport);
if (uid < 0 && version == 4) {
int8_t saddr128[16];
memset(saddr128, 0, 10);
saddr128[10] = 0xFF;
saddr128[11] = 0xFF;
memcpy(saddr128 + 12, saddr, 4);
uid = getUid(protocol, 6, saddr128, sport);
}
if (uid < 0 && tries < UIDTRIES) {
ng_log("get uid try %d", tries);
usleep(1000 * UIDDELAY);
}
}
}
@ -753,7 +757,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const struct arguments *args,
if (cur == NULL) {
if (tcphdr->syn) {
ng_log(ANDROID_LOG_DEBUG, "New SYN");
ng_log(ANDROID_LOG_INFO, "New session %s/%u uid %d", dest, ntohs(tcphdr->dest), uid);
// Register session
struct session *syn = malloc(sizeof(struct session));
@ -799,6 +803,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const struct arguments *args,
}
else {
ng_log(ANDROID_LOG_WARN, "Unknown session");
/*
struct session rst;
memset(&rst, 0, sizeof(struct session));
rst.saddr = iphdr->saddr;
@ -810,6 +815,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const struct arguments *args,
ng_log(ANDROID_LOG_ERROR,
"write RST error %d: %s",
errno, strerror((errno)));
*/
}
}
else {