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Add unpad function

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This commit is contained in:
Quentin 2019-08-28 11:35:43 +02:00
parent 298d0f7f26
commit 4d5dd554c5
1 changed files with 29 additions and 5 deletions
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34
src/algo_thunder.c
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@ -8,15 +8,16 @@
// A Tor cell size is 512 bytes but handle only 498 bytes of data
#define TOR_CELL_SIZE 498
#define ALLOWED_JITTER_MS 200
#define MAX_LINKS 64
struct thunder_ctx {
uint16_t recv_id;
uint16_t emit_id;
uint8_t selected_link;
uint8_t total_links;
uint8_t delta_t_per_link[64];
uint64_t received_pkts_on_link[64];
uint8_t blacklisted[64];
uint8_t delta_t_per_link[MAX_LINKS];
uint64_t received_pkts_on_link[MAX_LINKS];
uint8_t blacklisted[MAX_LINKS];
size_t monit_pkt_size;
struct timespec prev_link_time, prev_packet_time;
};
@ -193,8 +194,29 @@ void classify(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct b
}
}
void unpad() {
struct unpad_info {
union abstract_packet *ap_arr_pl[MAX_LINKS], *ap_arr_meta[MAX_LINKS];
uint8_t ap_arr_vals;
};
void unpad(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp, struct unpad_info *ui) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct thunder_ctx* thunderc = app_ctx->misc;
for (union abstract_packet* ap = buffer_first_ap (bp); ap != NULL; ap = ap_next(ap)) {
if (ap->fmt.headers.cmd != CMD_UDP_ENCAPSULATED) continue;
union abstract_packet* ap_meta = ap_next(ap);
if (ap_meta == NULL || ap_meta->fmt.headers.cmd != CMD_UDP_METADATA_THUNDER) {
fprintf(stderr, "Unexpected packet, expecting udp metadata\n");
}
if (ap_meta->fmt.content.udp_metadata_thunder.id > thunderc->recv_id) {
ui->ap_arr_pl[ui->ap_arr_vals] = ap;
ui->ap_arr_meta[ui->ap_arr_vals] = ap_meta;
ui->ap_arr_vals++;
}
}
}
void adapt() {
@ -202,8 +224,10 @@ void adapt() {
}
int algo_thunder_on_stream(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
struct unpad_info ui = {0};
classify(ctx, fdinfo, bp);
unpad();
unpad(ctx, fdinfo, bp, &ui);
adapt();
return 0;
}