mirror of https://github.com/M66B/NetGuard.git
Native rough FIN
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12e701004b
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65cc667d71
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@ -67,7 +67,7 @@ int canWrite(const int);
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int writeSYN(const struct connection *, const int);
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int writeACK(const struct connection *, struct data *, uint16_t confirm, int);
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int writeACK(const struct connection *, struct data *, uint16_t, int, int);
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void decode(JNIEnv *, jobject, const struct arguments *args, const uint8_t *, const uint16_t);
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@ -358,7 +358,8 @@ void *handle_events(void *a) {
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data->data = malloc(bytes);
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memcpy(data->data, buffer, bytes);
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// canWrite(args->tun)
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writeACK(cur, data, 0, args->tun);
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writeACK(cur, data, 0, 0, args->tun);
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// TODO check result
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// TODO retransmits
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free(data->data);
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free(data);
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@ -480,7 +481,7 @@ void handle_tcp(JNIEnv *env, jobject instance, const struct arguments *args,
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if (tcphdr->syn)
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__android_log_print(ANDROID_LOG_DEBUG, TAG, "Ignoring repeated SYN");
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else if (tcphdr->ack) {
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if (tcphdr->ack) {
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cur->time = time(NULL);
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if (cur->state == TCP_SYN_SENT) {
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@ -515,17 +516,39 @@ void handle_tcp(JNIEnv *env, jobject instance, const struct arguments *args,
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__android_log_print(ANDROID_LOG_ERROR, TAG, "send error %d: %s",
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errno, strerror(errno));
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else {
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if (writeACK(cur, NULL, data->len, args->tun))
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if (writeACK(cur, NULL, data->len, 0, args->tun))
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cur->remote_seq += data->len;
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}
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}
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}
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}
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else if (cur->state == TCP_LAST_ACK) {
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// TODO check seq/ack
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__android_log_print(ANDROID_LOG_DEBUG, TAG, "Full close");
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cur->state = TCP_CLOSE;
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}
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else {
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__android_log_print(ANDROID_LOG_WARN, TAG, "Ignored state %d", cur->state);
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}
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}
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if (tcphdr->fin) {
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if (cur->state == TCP_ESTABLISHED) {
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// TODO close socket
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__android_log_print(ANDROID_LOG_DEBUG, TAG, "Partial close");
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if (writeACK(cur, NULL, 1, 1, args->tun) >= 0) {
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cur->local_seq += 1;
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cur->remote_seq += 1;
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cur->state = TCP_LAST_ACK;
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}
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}
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}
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if (tcphdr->rst) {
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cur->state = TCP_CLOSE;
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}
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}
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}
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@ -673,7 +696,7 @@ int writeSYN(const struct connection *cur, int tun) {
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return res;
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}
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int writeACK(const struct connection *cur, struct data *data, uint16_t confirm, int tun) {
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int writeACK(const struct connection *cur, struct data *data, uint16_t confirm, int fin, int tun) {
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// Build packet
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uint16_t datalen = (data == NULL ? 0 : data->len);
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uint16_t len = sizeof(struct iphdr) + sizeof(struct tcphdr) + datalen; // no data
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@ -702,6 +725,7 @@ int writeACK(const struct connection *cur, struct data *data, uint16_t confirm,
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tcp->ack_seq = htonl(cur->remote_seq + confirm); // TODO proper wrap around
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tcp->doff = sizeof(struct tcphdr) >> 2;
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tcp->ack = 1;
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tcp->fin = fin;
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tcp->window = htons(2048);
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// Calculate TCP checksum
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@ -728,8 +752,8 @@ int writeACK(const struct connection *cur, struct data *data, uint16_t confirm,
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// Send packet
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__android_log_print(ANDROID_LOG_DEBUG, TAG,
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"Sending ACK to tun %s/%u seq %u ack %u data %u confirm %u",
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to, ntohs(tcp->dest),
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"Sending ACK%s to tun %s/%u seq %u ack %u data %u confirm %u",
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(fin ? "/FIN" : ""), to, ntohs(tcp->dest),
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ntohl(tcp->seq), ntohl(tcp->ack_seq), datalen, confirm);
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int res = write(tun, buffer, len);
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if (res < 0) {
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