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Merge branch 'feature/better_adaptivity'

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This commit is contained in:
Quentin 2019-05-14 14:09:59 +02:00
commit bc3ac8e9db
8 changed files with 197 additions and 178 deletions
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8
src/algo_dup2.c
View file

@ -22,15 +22,15 @@ int algo_dup2_on_stream(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo
// Check that we didn't already received the packet
struct dup2_ctx* dup2c = app_ctx->misc;
if (ring_ge(dup2c->recv_id, bp->ip.ap.str.id)) {
if (ring_ge(dup2c->recv_id, bp->ip.ap.fmt.content.clear.id)) {
mv_buffer_rtof(app_ctx, fdinfo);
return 0;
}
dup2c->recv_id = bp->ip.ap.str.id;
dup2c->recv_id = bp->ip.ap.fmt.content.clear.id;
// 1. Find destination
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.str.port);
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.fmt.content.clear.port);
to_fdinfo = evt_core_get_from_url (ctx, url);
if (to_fdinfo == NULL) {
fprintf(stderr, "No fd for URL %s in tcp-read. Dropping packet :( \n", url);
@ -49,7 +49,7 @@ int algo_dup2_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdin
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct dup2_ctx* dup2c = app_ctx->misc;
bp->ip.ap.str.id = dup2c->emit_id;
bp->ip.ap.fmt.content.clear.id = dup2c->emit_id;
dup2c->emit_id = dup2c->emit_id + 1;
struct evt_core_cat* cat = evt_core_get_from_cat (ctx, "tcp-write");

2
src/algo_naive.c
View file

@ -11,7 +11,7 @@ int algo_naive_on_stream(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinf
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
// 1. Find destination
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.str.port);
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.fmt.content.clear.port);
to_fdinfo = evt_core_get_from_url (ctx, url);
if (to_fdinfo == NULL) {
fprintf(stderr, "No fd for URL %s in tcp-read. Dropping packet :( \n", url);

283
src/algo_rr.c
View file

@ -5,34 +5,35 @@
#include "proxy.h"
#include "timer.h"
struct waited_pkt {
uint16_t id;
int link_num;
uint8_t on;
struct timer_info {
uint16_t health_id;
uint8_t prevlink;
uint16_t min_blocked_pkt;
struct algo_ctx* algo;
};
struct deferred_pkt {
struct queued_pkt {
uint8_t on;
int link_fd;
int idx;
uint16_t id;
uint8_t on;
struct algo_ctx* algo;
};
struct rr_ctx {
uint8_t my_links;
uint16_t my_links_ver;
uint8_t remote_links;
int64_t mjit;
uint16_t recv_id;
uint16_t recv_id_late;
uint16_t sent_id;
uint8_t current_link;
int64_t mjit;
uint16_t health_id;
uint16_t health_id_late;
uint16_t content_id;
uint16_t sent_health_id;
uint16_t sent_content_id;
struct internet_packet prev_packet;
struct timespec emit_time;
struct deferred_pkt real[PACKET_BUFFER_SIZE];
struct waited_pkt wait[PACKET_BUFFER_SIZE];
struct queued_pkt real[PACKET_BUFFER_SIZE];
struct timer_info wait[PACKET_BUFFER_SIZE];
};
void show_link_availability(struct rr_ctx* rr) {
@ -49,110 +50,53 @@ void show_link_availability(struct rr_ctx* rr) {
printf("]\n");
}
void expired_wait (struct evt_core_ctx* ctx, void* user);
void expired_late(struct evt_core_ctx* ctx, void* user);
void on_timeout_health (struct evt_core_ctx* ctx, void* user);
void rr_pkt_register(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct rr_ctx* rr = app_ctx->misc;
char buffer[16];
url_get_port (buffer, fdinfo->url);
int link_num = atoi(buffer) - 7500; // @FIXME Hardcoded
uint16_t real_idx = bp->ip.ap.str.id % PACKET_BUFFER_SIZE;
uint16_t wait_idx = (bp->ip.ap.str.id - 1) % PACKET_BUFFER_SIZE;
uint16_t real_idx = bp->ip.ap.fmt.content.clear.id % PACKET_BUFFER_SIZE;
//printf("Selected url %s for pkt %d to be queued for delivery\n", fdinfo->url, bp->ip.ap.str.id);
assert(bp->ip.ap.headers.cmd == CMD_CLEAR);
// 0. Update remote links
if (ring_lt(rr->recv_id_late, bp->ip.ap.str.id) && !(rr->remote_links & 1 << link_num)) {
printf("Activate link=%d | ", link_num);
rr->remote_links |= 1 << link_num; // Make sure that the link is marked as working
show_link_availability (rr);
}
// 1. Update my links I can use thanks to target feedback
if (bp->ip.ap.str.id > rr->my_links_ver && bp->ip.ap.str.bitfield != rr->my_links) {
rr->my_links = bp->ip.ap.str.bitfield;
rr->my_links_ver = bp->ip.ap.str.id;
printf("Update my links | ");
show_link_availability (rr);
}
// 2. If packet arrived too late or already queued, we discard it
if (ring_ge(rr->recv_id, bp->ip.ap.str.id) || rr->real[real_idx].id == bp->ip.ap.str.id) {
// Packet has already been delivered or dropped, we free the buffer
fprintf(stderr, "Packet %d arrived too late (current: %d) or already received\n", bp->ip.ap.str.id, rr->recv_id);
mv_buffer_wtof (app_ctx, fdinfo);
return;
}
// 3. If packet arrived too early, we wait for its predecessors
//printf("%d < %d = %d\n", rr->recv_id, bp->ip.ap.str.id - 1, ring_lt(rr->recv_id, bp->ip.ap.str.id - 1));
if (ring_lt(rr->recv_id, bp->ip.ap.str.id - 1)) {
int64_t timeout = rr->mjit - (int64_t) bp->ip.ap.str.deltat;
//printf("%ld - %ld = %ld\n", rr->mjit, (int64_t) bp->ip.ap.str.deltat, timeout);
if (timeout <= 0) timeout = 0;
if (rr->wait[wait_idx].on && rr->wait[wait_idx].id != bp->ip.ap.str.id - 1) {
fprintf(stderr, "Waiting array overlap, BUG: [\n");
for (int i = 0; i < PACKET_BUFFER_SIZE; i++) {
printf("\t%d => %d\n", rr->wait[i].id, rr->wait[i].on);
}
printf("] - could be replaced by drop\n");
exit(EXIT_FAILURE);
} else if (!rr->wait[wait_idx].on) {
rr->wait[wait_idx].on = 1;
rr->wait[wait_idx].id = bp->ip.ap.str.id - 1;
rr->wait[wait_idx].link_num = bp->ip.ap.str.prevlink;
rr->wait[wait_idx].algo = app_ctx;
set_timeout(ctx, timeout, &rr->wait[wait_idx], expired_wait);
}
}
// 4. We queue the packet to keep it
if (rr->real[real_idx].on && rr->real[real_idx].id != bp->ip.ap.str.id) {
fprintf(stderr, "Real array is full for id=%d, idx=%d, BUG: [\n", bp->ip.ap.str.id, real_idx);
// 1. We queue the packet to keep it
if (rr->real[real_idx].on && rr->real[real_idx].id != bp->ip.ap.fmt.content.clear.id) {
fprintf(stderr, "Real array is full for id=%d, idx=%d, BUG: [\n", bp->ip.ap.fmt.content.clear.id, real_idx);
for (int i = 0; i < PACKET_BUFFER_SIZE; i++) {
printf("\t%d => %d\n", rr->real[i].id, rr->real[i].on);
}
printf("] - could be replaced by drop\n");
exit(EXIT_FAILURE);
} else if (!rr->real[real_idx].on) {
rr->real[real_idx].on = 2;
rr->real[real_idx].id = bp->ip.ap.str.id;
} else if (!rr->real[real_idx].on && ring_gt(bp->ip.ap.fmt.content.clear.id, rr->content_id)) {
rr->real[real_idx].on = 1;
rr->real[real_idx].id = bp->ip.ap.fmt.content.clear.id;
rr->real[real_idx].idx = real_idx;
rr->real[real_idx].link_fd = fdinfo->fd;
rr->real[real_idx].algo = app_ctx;
mv_buffer_rtoa(app_ctx, fdinfo, &rr->real[real_idx].idx);
// 5. We register a timer for this packet to create a reactivation window for broken links
set_timeout(ctx, rr->mjit + 1, &rr->real[real_idx], expired_late);
//printf("%d is added to real as %d\n", bp->ip.ap.str.id, idx_real);
} else {
fprintf(stdout, "Packet %d already received (current: %d)\n", bp->ip.ap.str.id, rr->recv_id);
mv_buffer_wtof (app_ctx, fdinfo);
if (ctx->verbose) fprintf(stdout, "Packet %d already received (current: %d)\n", bp->ip.ap.fmt.content.clear.id, rr->content_id);
mv_buffer_rtof (app_ctx, fdinfo);
}
}
}
void rr_deliver(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct deferred_pkt* dp) {
void rr_deliver(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx, struct queued_pkt* dp) {
struct evt_core_fdinfo *to_fdinfo = NULL;
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct rr_ctx* rr = app_ctx->misc;
char url[255];
// 1. Marked the packet as handled
dp->on--;
dp->on = 0;
// 2. Get the buffer
struct buffer_packet* bp = get_app_buffer (app_ctx, &dp->idx);
assert(bp->ip.ap.headers.cmd == CMD_CLEAR);
// 3. We update our cursor
rr->recv_id = bp->ip.ap.str.id;
rr->content_id = bp->ip.ap.fmt.content.clear.id;
// 4. Find its target
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.str.port);
sprintf(url, "udp:write:127.0.0.1:%d", bp->ip.ap.fmt.content.clear.port);
to_fdinfo = evt_core_get_from_url (ctx, url);
if (to_fdinfo == NULL) {
fprintf(stderr, "No fd for URL %s in udp:write for tcp-read. Dropping packet :( \n", url);
@ -166,6 +110,54 @@ void rr_deliver(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct
main_on_udp_write(ctx, to_fdinfo);
}
void rr_pkt_manage_links(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo, struct buffer_packet* bp) {
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct rr_ctx* rr = app_ctx->misc;
assert(bp->ip.ap.headers.cmd == CMD_HEALTH);
// 1. Health packet was received too late, dropping it
if (ring_le(bp->ip.ap.fmt.content.health.id, rr->health_id_late)) goto release;
// 2. Reactivate link if deactivated
char buffer[16];
url_get_port (buffer, fdinfo->url);
int link_num = atoi(buffer) - 7500; // @FIXME Hardcoded
if (!(rr->remote_links & (1 << link_num))) {
printf("Activate link=%d | ", link_num);
rr->remote_links |= 1 << link_num; // Make sure that the link is marked as working
show_link_availability (rr);
}
// 3. Update RR structure if its the greatest health_id we received
if (ring_gt(bp->ip.ap.fmt.content.health.id, rr->health_id)) {
// 3.1. Update current health id
rr->health_id = bp->ip.ap.fmt.content.health.id;
// 3.2. Update my links I can use thanks to target feedback
if (bp->ip.ap.fmt.content.health.bitfield != rr->my_links) {
rr->my_links = bp->ip.ap.fmt.content.health.bitfield;
printf("Update my links | ");
show_link_availability (rr);
}
}
// 4. Set callback to close this health packet window
int64_t timeout = rr->mjit - (int64_t) bp->ip.ap.fmt.content.health.deltat;
if (timeout <= 0) timeout = 0;
uint64_t idx = bp->ip.ap.fmt.content.health.id % PACKET_BUFFER_SIZE;
rr->wait[idx].health_id = bp->ip.ap.fmt.content.health.id;
rr->wait[idx].prevlink = bp->ip.ap.fmt.content.health.prevlink;
rr->wait[idx].min_blocked_pkt = bp->ip.ap.fmt.content.health.min_blocked_pkt;
rr->wait[idx].algo = app_ctx;
set_timeout (ctx, timeout, &rr->wait[idx], on_timeout_health);
release:
mv_buffer_rtof(app_ctx, fdinfo);
}
void rr_pkt_unroll(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx) {
struct rr_ctx* rr = app_ctx->misc;
struct evt_core_fdinfo* fdinfo = NULL;
@ -173,16 +165,9 @@ void rr_pkt_unroll(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx) {
while(1) {
//printf("Trying to deliver %d\n", rr->recv_id+1);
struct deferred_pkt* def = &rr->real[(rr->recv_id+1) % PACKET_BUFFER_SIZE];
struct queued_pkt* def = &rr->real[(rr->content_id+1) % PACKET_BUFFER_SIZE];
if (!def->on) break;
fdinfo = evt_core_get_from_fd (ctx, def->link_fd);
if (fdinfo == NULL) {
fprintf(stderr, "An error occured as the link seems to be closed for the requested fd\n");
rr->recv_id++;
continue;
}
rr_deliver(ctx, fdinfo, def);
rr_deliver(ctx, app_ctx, def);
//printf("Delivered %d\n", rr->recv_id);
}
}
@ -193,11 +178,17 @@ int algo_rr_on_stream(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo,
struct algo_ctx* app_ctx = fdinfo->cat->app_ctx;
struct rr_ctx* rr = app_ctx->misc;
if (bp->ip.ap.fmt.headers.cmd == CMD_CLEAR) {
if (ctx->verbose) printf("Received a CLEAR packet of size %d\n", bp->ip.ap.fmt.headers.size);
// 1. Register packet in our queue
rr_pkt_register(ctx, fdinfo, bp);
// 2. Process queue
rr_pkt_unroll (ctx, app_ctx);
} else if (bp->ip.ap.fmt.headers.cmd == CMD_HEALTH) {
if (ctx->verbose) printf("Received a HEALTH packet of size %d\n", bp->ip.ap.fmt.headers.size);
rr_pkt_manage_links(ctx, fdinfo, bp);
}
return 0;
co_error:
@ -221,28 +212,45 @@ int algo_rr_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo
exit(EXIT_FAILURE);
}
// 2. Compute delta t
secs = curr.tv_sec - rr->emit_time.tv_sec;
nsecs = curr.tv_nsec - rr->emit_time.tv_nsec;
rr->emit_time = curr;
mili_sec = secs * 1000 + nsecs / 1000000;
if (mili_sec > rr->mjit) mili_sec = rr->mjit;
bp->ip.ap.str.id = rr->sent_id;
bp->ip.ap.str.flags = 0;
bp->ip.ap.str.deltat = mili_sec;
bp->ip.ap.str.bitfield = rr->remote_links;
bp->ip.ap.str.prevlink = rr->current_link;
// 3. Backup clear packet
struct buffer_packet clear_packet;
assert(bp->ip.ap.headers.cmd == CMD_CLEAR);
append_buffer (&clear_packet.ip.ap, 0, &bp->ip.ap);
// 4. Set health packet
bp->ip.ap.fmt.headers.cmd = CMD_HEALTH;
bp->ip.ap.fmt.headers.size = sizeof(bp->ip.ap.fmt.headers) + sizeof(bp->ip.ap.fmt.content.health);
bp->ip.ap.fmt.content.health.id = rr->sent_health_id;
bp->ip.ap.fmt.content.health.deltat = mili_sec;
bp->ip.ap.fmt.content.health.prevlink = rr->current_link;
bp->ip.ap.fmt.content.health.bitfield = rr->remote_links;
rr->sent_health_id++;
// 5. Append clear packet
clear_packet.ip.ap.fmt.content.clear.id = rr->sent_content_id;
rr->sent_content_id++;
bp->ip.ap.fmt.content.health.min_blocked_pkt = clear_packet.ip.ap.fmt.content.clear.id;
append_buffer (&bp->ip.ap, 1, &clear_packet.ip.ap);
bp->ap_count++;
// 6. Append redundancy if needed
if (app_ctx->ap.redundant_data == 1) {
append_buffer(&bp->ip.ap, 1, &rr->prev_packet.ap); // We append previous packet
append_buffer(&rr->prev_packet.ap, 0, &bp->ip.ap); // We store current packet for next time
assert(ring_gt(bp->ip.ap.fmt.content.health.min_blocked_pkt, rr->prev_packet.ap.fmt.content.clear.id));
bp->ip.ap.fmt.content.health.min_blocked_pkt = rr->prev_packet.ap.fmt.content.clear.id;
append_buffer(&bp->ip.ap, 2, &rr->prev_packet.ap); // We append previous packet
append_buffer(&rr->prev_packet.ap, 0, &clear_packet.ip.ap); // We store current packet for next time
bp->ap_count++;
}
//printf("Will send packet id=%d\n", bp->ip.ap.str.id);
rr->emit_time = curr;
rr->sent_id++;
// 2. Try to find someone to send it
// 7. Try to find someone to send it
int max = 16;
uint8_t sel_link = rr->current_link;
while(max-- >= 0) {
@ -251,13 +259,14 @@ int algo_rr_on_datagram(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo
to_fdinfo = evt_core_get_from_url (ctx, url);
if (to_fdinfo == NULL) continue; // Missing link
if (app_ctx->ap.is_waiting_bootstrap && !app_ctx->is_rdy) goto not_ready; // Some links are down
if (!app_ctx->ap.is_healing || rr->my_links & (1 << sel_link)) {
if (!app_ctx->ap.is_healing /* if healing deactivated */|| rr->my_links & (1 << sel_link) /* if link not down */ ) {
rr->current_link = sel_link;
mv_buffer_rtow (app_ctx, fdinfo, to_fdinfo);
main_on_tcp_write(ctx, to_fdinfo);
return 0;
} else {
dup_buffer_tow(app_ctx, bp, to_fdinfo);
struct buffer_packet* dup_bp = dup_buffer_tow(app_ctx, bp, to_fdinfo);
dup_bp->ap_count = 1; // We want to send only health packet to help link recover... Bwarf same traffic on Tor...
main_on_tcp_write(ctx, to_fdinfo);
}
}
@ -273,39 +282,30 @@ co_error:
exit(EXIT_FAILURE);
}
void expired_wait(struct evt_core_ctx* ctx, void* user) {
struct waited_pkt* pkt = user;
struct rr_ctx* rr = pkt->algo->misc;
void on_timeout_health (struct evt_core_ctx* ctx, void* raw) {
struct timer_info* t = raw;
struct algo_ctx* app_ctx = t->algo;
struct rr_ctx* rr = app_ctx->misc;
// 1. Release lock
pkt->on = 0;
// 1. Update link recovery window if needed
if (ring_gt(t->health_id, rr->health_id_late)) rr->health_id_late = t->health_id;
// 2. We will not reactivate link for this packet
if (ring_lt(rr->recv_id_late, pkt->id)) rr->recv_id_late = pkt->id;
// 3. Stop if packet has been received and delivered
if (ring_le (pkt->id, rr->recv_id)) return;
printf("Timer reached for packet %d\n", pkt->id);
// 4. BLACKLIST LINK
printf("Blacklist link=%d | ", pkt->link_num);
rr->remote_links &= 0xff ^ 1 << pkt->link_num;
// 2. Blacklist previous link if needed
uint16_t prev_health_id = (t->health_id - 1);
uint16_t prev_health_idx = prev_health_id % PACKET_BUFFER_SIZE;
struct timer_info* t_old = &rr->wait[prev_health_idx];
if (t_old->health_id != prev_health_id) {
printf("Blacklist link=%d | ", t->prevlink);
rr->remote_links &= 0xff ^ 1 << t->prevlink;
show_link_availability (rr);
// 5. Deliver following packets
while (ring_lt(rr->recv_id, pkt->id)) {
rr->recv_id++;
rr_pkt_unroll (ctx, pkt->algo);
}
}
void expired_late(struct evt_core_ctx* ctx, void* user) {
struct deferred_pkt* pkt = user;
struct rr_ctx* rr = pkt->algo->misc;
pkt->on--;
if (ring_lt(rr->recv_id_late, pkt->id)) rr->recv_id_late = pkt->id;
// 3. Deliver blocked packets
//printf("t->min_blocked_pkt=%d, rr->content_id=%d\n", t->min_blocked_pkt, rr->content_id);
while (ring_gt(t->min_blocked_pkt, rr->content_id)) {
rr->content_id++;
rr_pkt_unroll (ctx, app_ctx);
}
}
int algo_rr_on_err(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
@ -328,9 +328,12 @@ void algo_rr_init(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx, struct alg
rr->mjit = 200;
rr->my_links = 0xff;
rr->remote_links = 0xff;
rr->sent_id = 1;
rr->recv_id = 0;
rr->recv_id_late = 0;
rr->sent_health_id = 1;
rr->sent_content_id = 1;
rr->health_id = 0;
rr->health_id_late = 0;
rr->content_id = 0;
rr->current_link = 0;
app_ctx->misc = rr;
app_ctx->free_misc = algo_rr_free;

11
src/algo_utils.c
View file

@ -43,7 +43,7 @@ struct buffer_packet* get_read_buffer(struct algo_ctx *app_ctx, struct evt_core_
struct buffer_packet* bp;
// 1. Check if we don't have a buffer
bp = g_hash_table_lookup (app_ctx->used_buffer, &fdinfo->fd);
bp = fdinfo == NULL ? NULL : g_hash_table_lookup (app_ctx->used_buffer, &fdinfo->fd);
if (bp != NULL) return bp;
// 2. Get a new buffer otherwise
@ -189,14 +189,14 @@ void mv_buffer_atof(struct algo_ctx* app_ctx, void* from) {
g_queue_push_tail (app_ctx->free_buffer, bp);
}
void dup_buffer_tow(struct algo_ctx* app_ctx, struct buffer_packet* bp, struct evt_core_fdinfo* to) {
struct buffer_packet* dup_buffer_tow(struct algo_ctx* app_ctx, struct buffer_packet* bp, struct evt_core_fdinfo* to) {
GQueue* q;
// 1. We get a free buffer
struct buffer_packet* bp_dest = g_queue_pop_head(app_ctx->free_buffer);
if (bp_dest == NULL) {
debug_buffer(app_ctx, to);
return;
return NULL;
}
// 2. We duplicate the data
@ -211,6 +211,7 @@ void dup_buffer_tow(struct algo_ctx* app_ctx, struct buffer_packet* bp, struct e
// 4. We push the content to the appropriate destination
g_queue_push_tail(q, bp_dest);
return bp_dest;
}
struct buffer_packet* get_app_buffer(struct algo_ctx *app_ctx, void* idx) {
@ -238,9 +239,9 @@ void notify_read(struct evt_core_ctx* ctx, struct algo_ctx* app_ctx) {
int append_buffer(union abstract_packet* dest, int pos, union abstract_packet* src) {
char* target = &(dest->raw);
while (pos-- > 0) {
target += dest->str.size;
target += ((union abstract_packet*) target)->fmt.headers.size;
}
memcpy(target, src, src->str.size);
memcpy(target, src, src->fmt.headers.size);
return 0;
}

2
src/algo_utils.h
View file

@ -51,7 +51,7 @@ void mv_buffer_wtof(struct algo_ctx* app_ctx, struct evt_core_fdinfo* from);
void mv_buffer_rtoa(struct algo_ctx* app_ctx, struct evt_core_fdinfo* from, void* to);
void mv_buffer_atow(struct algo_ctx* app_ctx, void* from, struct evt_core_fdinfo* to);
void mv_buffer_atof(struct algo_ctx* app_ctx, void* from);
void dup_buffer_tow(struct algo_ctx* app_ctx, struct buffer_packet* bp, struct evt_core_fdinfo* to);
struct buffer_packet* dup_buffer_tow(struct algo_ctx* app_ctx, struct buffer_packet* bp, struct evt_core_fdinfo* to);
int append_buffer(union abstract_packet* dest, int pos, union abstract_packet* src);

23
src/packet.c
View file

@ -3,14 +3,14 @@
size_t get_full_size(struct buffer_packet* bp) {
union abstract_packet* ap = &bp->ip.ap;
for (int i = 0; i < bp->ap_count; i++) {
ap = (union abstract_packet*)(&ap->raw + ap->str.size);
ap = (union abstract_packet*)(&ap->raw + ap->fmt.headers.size);
}
return &ap->raw - &bp->ip.ap.raw;
}
enum FD_STATE read_packet_from_tcp(int fd, struct buffer_packet* bp) {
ssize_t nread;
size_t pkt_size_size = sizeof(bp->ip.ap.str.size);
size_t pkt_size_size = sizeof(bp->ip.ap.fmt.headers.size);
if (bp->mode != BP_READING) return FDS_ERR;
while (bp->aread < pkt_size_size) {
@ -21,8 +21,8 @@ enum FD_STATE read_packet_from_tcp(int fd, struct buffer_packet* bp) {
bp->aread += nread;
}
while (bp->aread < bp->ip.ap.str.size) {
nread = read(fd, &(bp->ip.ap.raw) + bp->aread, bp->ip.ap.str.size - bp->aread);
while (bp->aread < bp->ip.ap.fmt.headers.size) {
nread = read(fd, &(bp->ip.ap.raw) + bp->aread, bp->ip.ap.fmt.headers.size - bp->aread);
if (nread == 0) return FDS_AGAIN;
if (nread == -1 && errno == EAGAIN) return FDS_AGAIN;
if (nread == -1) return FDS_ERR;
@ -46,7 +46,6 @@ enum FD_STATE write_packet_to_tcp(int fd, struct buffer_packet* bp) {
if (nwrite == -1) return FDS_ERR;
bp->awrite += nwrite;
}
bp->mode = BP_READING;
bp->aread = 0;
bp->ap_count = 0;
@ -57,7 +56,8 @@ enum FD_STATE write_packet_to_tcp(int fd, struct buffer_packet* bp) {
enum FD_STATE write_packet_to_udp(int fd, struct buffer_packet* bp, struct udp_target* udp_t) {
ssize_t nwrite;
size_t bytes_to_send;
size_t pkt_header_size = sizeof(bp->ip.ap.str) - sizeof(char);
assert(bp->ip.ap.headers.cmd == CMD_CLEAR);
size_t pkt_header_size = sizeof(bp->ip.ap.fmt.headers) + sizeof(bp->ip.ap.fmt.content.clear) - sizeof(char);
struct sockaddr* addr = NULL;
socklen_t addrlen = 0;
if (udp_t->set) {
@ -67,9 +67,9 @@ enum FD_STATE write_packet_to_udp(int fd, struct buffer_packet* bp, struct udp_t
if (bp->mode != BP_WRITING) return FDS_ERR;
bytes_to_send = bp->ip.ap.str.size - pkt_header_size;
bytes_to_send = bp->ip.ap.fmt.headers.size - pkt_header_size;
nwrite = sendto(fd,
&(bp->ip.ap.str.payload),
&(bp->ip.ap.fmt.content.clear.payload),
bytes_to_send,
0,
addr,
@ -89,12 +89,12 @@ enum FD_STATE read_packet_from_udp (int fd, struct buffer_packet* bp, struct udp
ssize_t nread;
if (bp->mode != BP_READING) return FDS_ERR;
size_t pkt_header_size = sizeof(bp->ip.ap.str) - sizeof(char); // We remove the payload
size_t pkt_header_size = sizeof(bp->ip.ap.fmt.headers) + sizeof(bp->ip.ap.fmt.content.clear) - sizeof(char); // We remove the payload
size_t udp_packet_size = sizeof(struct internet_packet) - pkt_header_size;
socklen_t addrlen = sizeof(struct sockaddr_in);
nread = recvfrom(fd,
&(bp->ip.ap.str.payload),
&(bp->ip.ap.fmt.content.clear.payload),
udp_packet_size,
MSG_TRUNC,
(struct sockaddr*)&udp_t->addr,
@ -106,7 +106,8 @@ enum FD_STATE read_packet_from_udp (int fd, struct buffer_packet* bp, struct udp
udp_t->set = 1;
udp_t->addrlen = addrlen;
bp->ip.ap.str.size = nread + pkt_header_size;
bp->ip.ap.fmt.headers.size = nread + pkt_header_size;
bp->ip.ap.fmt.headers.cmd = CMD_CLEAR;
bp->mode = BP_WRITING;
bp->awrite = 0;

24
src/packet.h
View file

@ -1,4 +1,5 @@
#pragma once
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -28,22 +29,35 @@ enum BP_MODE {
BP_WRITING
};
enum PKT_FLAGS {
PKT_CONTROL = 1 << 0
enum PKT_CMD {
CMD_HEALTH,
CMD_CLEAR,
CMD_XOR
};
union abstract_packet {
char raw;
struct {
struct {
uint16_t size;
uint16_t port;
enum PKT_CMD cmd;
} headers;
union {
struct {
uint16_t id;
uint8_t bitfield;
uint8_t prevlink;
uint16_t deltat;
uint8_t flags;
uint16_t min_blocked_pkt;
} health;
struct {
uint16_t id;
uint16_t port;
char payload;
} str;
} clear;
} content;
} fmt;
};
struct internet_packet {

2
src/proxy.c
View file

@ -71,7 +71,7 @@ int main_on_udp_read(struct evt_core_ctx* ctx, struct evt_core_fdinfo* fdinfo) {
if ((bp = get_read_buffer(app_ctx, fdinfo)) == NULL) return 1;
// 2. Read packet from socket
bp->ip.ap.str.port = url_get_port_int (fdinfo->url);
bp->ip.ap.fmt.content.clear.port = url_get_port_int (fdinfo->url);
read_res = read_packet_from_udp (fdinfo->fd, bp, fdinfo->other);
if (read_res == FDS_ERR) goto co_error;
if (read_res == FDS_AGAIN) return 1;