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Code Issues Releases Wiki Activity

Native SYN data

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This commit is contained in:
M66B 2016-01-13 20:17:21 +01:00
parent ec2485ac1a
commit 3363595327
1 changed files with 30 additions and 16 deletions
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46
app/src/main/jni/netguard/netguard.c
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@ -37,6 +37,7 @@ struct arguments {
struct data {
uint32_t seq; // host notation
jbyte *data;
uint32_t len;
struct data *next;
};
@ -109,9 +110,11 @@ JNIEXPORT void JNICALL
Java_eu_faircode_netguard_SinkholeService_jni_1stop(JNIEnv *env, jobject instance, jint tun) {
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Stop");
if (running) {
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Kill");
int err = pthread_kill(thread_id, SIGUSR1);
if (err != 0)
__android_log_print(ANDROID_LOG_WARN, TAG, "pthread_kill error %d", err);
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Join");
pthread_join(thread_id, NULL);
if (err != 0)
__android_log_print(ANDROID_LOG_WARN, TAG, "pthread_join error %d", err);
@ -190,9 +193,11 @@ void *handle_events(void *a) {
dest, ntohs(cur->dest), cur->lport);
// TODO check if open
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Shutdown");
shutdown(cur->socket, SHUT_RDWR);
// TODO check for errors
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Unlink");
if (last == NULL)
connection = cur->next;
else
@ -200,6 +205,7 @@ void *handle_events(void *a) {
struct data *prev;
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Free received");
struct data *received = cur->received;
while (received != NULL) {
prev = received;
@ -209,6 +215,7 @@ void *handle_events(void *a) {
free(prev);
}
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Free send");
struct data *sent = cur->sent;
while (sent != NULL) {
prev = sent;
@ -218,6 +225,7 @@ void *handle_events(void *a) {
free(prev);
}
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Free");
free(cur);
} else {
@ -373,6 +381,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const uint8_t *buffer, uint16_t l
data->next = NULL;
if (datalen)
memcpy(data->data, buffer + dataoff, datalen);
data->len = datalen;
// Search connection
struct connection *last = NULL;
@ -385,10 +394,10 @@ void handle_tcp(JNIEnv *env, jobject instance, const uint8_t *buffer, uint16_t l
// Log
char dest[20];
inet_ntop(AF_INET, &(iphdr->daddr), dest, sizeof(dest));
__android_log_print(ANDROID_LOG_DEBUG, TAG, "%s/%u seq %u ack %u data %d",
__android_log_print(ANDROID_LOG_DEBUG, TAG, "%s/%u seq %u ack %u data %d %s",
dest, ntohs(tcphdr->dest),
ntohl(tcphdr->seq), ntohl(tcphdr->ack_seq),
datalen);
datalen, hex(data->data, data->len));
if (cur == NULL) {
if (tcphdr->syn) {
@ -407,7 +416,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const uint8_t *buffer, uint16_t l
syn->received = data;
syn->sent = NULL;
syn->next = NULL;
// TODO handle data
syn->received = data;
// Build target address
struct sockaddr_in daddr;
@ -443,11 +452,15 @@ void handle_tcp(JNIEnv *env, jobject instance, const uint8_t *buffer, uint16_t l
cur->time = time(NULL);
if (cur->state == TCP_SYN_SENT) {
// TODO check seq
if (ntohl(tcphdr->ack_seq) == cur->local_seq + 1 &&
ntohl(tcphdr->seq) == cur->remote_seq + 1) {
cur->local_seq++;
cur->remote_seq++;
ntohl(tcphdr->seq) == cur->remote_seq + cur->received->len + 1) {
cur->local_seq += 1;
cur->remote_seq += cur->received->len + 1;
if (cur->received->data != NULL)
free(cur->received->data);
free(cur->received);
cur->received = NULL;
__android_log_print(ANDROID_LOG_DEBUG, TAG, "Established");
cur->state = TCP_ESTABLISHED;
@ -557,7 +570,7 @@ int writeSYN(const struct connection *cur, int tun) {
tcp->source = cur->dest;
tcp->dest = cur->source;
tcp->seq = htonl(cur->local_seq);
tcp->ack_seq = htonl(cur->remote_seq + 1); // TODO proper wrap around
tcp->ack_seq = htonl(cur->remote_seq + cur->received->len + 1); // TODO proper wrap around
tcp->doff = sizeof(struct tcphdr) >> 2;
tcp->syn = 1;
tcp->ack = 1;
@ -835,18 +848,19 @@ void nsleep(const long ns) {
nanosleep(&tim, &tim2);
}
char hexout[250];
char *hex(const u_int8_t *data, const u_int16_t len) {
char hex_str[] = "0123456789ABCDEF";
char *out;
out = (char *) malloc(len * 2 + 1); // TODO free
(out)[len * 2] = 0;
if (!len) return NULL;
//char *out;
//out = (char *) malloc(len * 3 + 1); // TODO free
hexout[len * 3] = 0;
for (size_t i = 0; i < len; i++) {
(out)[i * 2 + 0] = hex_str[(data[i] >> 4) & 0x0F];
(out)[i * 2 + 1] = hex_str[(data[i]) & 0x0F];
hexout[i * 3 + 0] = hex_str[(data[i] >> 4) & 0x0F];
hexout[i * 3 + 1] = hex_str[(data[i]) & 0x0F];
hexout[i * 3 + 2] = ' ';
}
return out;
return hexout;
}