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#include "util.h"
#include "psched.h"
flxPacketScheduler *flx_packet_scheduler_new(flxServer *server, flxInterface *i, guchar protocol) {
flxPacketScheduler *s;
g_assert(server);
g_assert(i);
s = g_new(flxPacketScheduler, 1);
s->server = server;
s->interface = i;
s->protocol = protocol;
FLX_LLIST_HEAD_INIT(flxQueryJob, s->query_jobs);
FLX_LLIST_HEAD_INIT(flxResponseJob, s->response_jobs);
return s;
}
static void query_job_free(flxPacketScheduler *s, flxQueryJob *qj) {
g_assert(qj);
if (qj->time_event)
flx_time_event_queue_remove(qj->scheduler->server->time_event_queue, qj->time_event);
FLX_LLIST_REMOVE(flxQueryJob, jobs, s->query_jobs, qj);
flx_key_unref(qj->key);
g_free(qj);
}
static void response_job_free(flxPacketScheduler *s, flxResponseJob *rj) {
g_assert(rj);
if (rj->time_event)
flx_time_event_queue_remove(rj->scheduler->server->time_event_queue, rj->time_event);
FLX_LLIST_REMOVE(flxResponseJob, jobs, s->response_jobs, rj);
flx_record_unref(rj->record);
g_free(rj);
}
void flx_packet_scheduler_free(flxPacketScheduler *s) {
flxQueryJob *qj;
flxResponseJob *rj;
flxTimeEvent *e;
g_assert(s);
while ((qj = s->query_jobs))
query_job_free(s, qj);
while ((rj = s->response_jobs))
response_job_free(s, rj);
g_free(s);
}
static guint8* packet_add_query_job(flxPacketScheduler *s, flxDnsPacket *p, flxQueryJob *qj) {
guint8 *d;
g_assert(s);
g_assert(p);
g_assert(qj);
if ((d = flx_dns_packet_append_key(p, qj->key))) {
GTimeVal tv;
qj->done = 1;
/* Drop query after 100ms from history */
flx_elapse_time(&tv, 100, 0);
flx_time_event_queue_update(s->server->time_event_queue, qj->time_event, &tv);
}
return d;
}
static void query_elapse(flxTimeEvent *e, gpointer data) {
flxQueryJob *qj = data;
flxPacketScheduler *s;
flxDnsPacket *p;
guint n;
guint8 *d;
g_assert(qj);
s = qj->scheduler;
if (qj->done) {
/* Lets remove it from the history */
query_job_free(s, qj);
return;
}
p = flx_dns_packet_new_query(s->interface->mtu - 48);
d = packet_add_query_job(s, p, qj);
g_assert(d);
n = 1;
/* Try to fill up packet with more queries, if available */
for (qj = s->query_jobs; qj; qj = qj->jobs_next) {
if (qj->done)
continue;
if (!packet_add_query_job(s, p, qj))
break;
n++;
}
flx_dns_packet_set_field(p, DNS_FIELD_QDCOUNT, n);
flx_interface_send_packet(s->interface, s->protocol, p);
flx_dns_packet_free(p);
}
static flxQueryJob* look_for_query(flxPacketScheduler *s, flxKey *key) {
flxQueryJob *qj;
g_assert(s);
g_assert(key);
for (qj = s->query_jobs; qj; qj = qj->jobs_next)
if (flx_key_equal(qj->key, key))
return qj;
return NULL;
}
void flx_packet_scheduler_post_query(flxPacketScheduler *s, flxKey *key) {
flxQueryJob *qj;
GTimeVal tv;
g_assert(s);
g_assert(key);
if (look_for_query(s, key))
return;
qj = g_new(flxQueryJob, 1);
qj->key = flx_key_ref(key);
qj->done = FALSE;
flx_elapse_time(&tv, 100, 0);
qj->time_event = flx_time_event_queue_add(s->server->time_event_queue, &tv, query_elapse, qj);
qj->scheduler = s;
FLX_LLIST_PREPEND(flxQueryJob, jobs, s->query_jobs, qj);
}
static guint8* packet_add_response_job(flxPacketScheduler *s, flxDnsPacket *p, flxResponseJob *rj) {
guint8 *d;
g_assert(s);
g_assert(p);
g_assert(rj);
if ((d = flx_dns_packet_append_record(p, rj->record, FALSE))) {
GTimeVal tv;
rj->done = 1;
/* Drop response after 1s from history */
flx_elapse_time(&tv, 1000, 0);
flx_time_event_queue_update(s->server->time_event_queue, rj->time_event, &tv);
}
return d;
}
static void response_elapse(flxTimeEvent *e, gpointer data) {
flxResponseJob *rj = data;
flxPacketScheduler *s;
flxDnsPacket *p;
guint n;
guint8 *d;
g_assert(rj);
s = rj->scheduler;
if (rj->done) {
/* Lets remove it from the history */
response_job_free(s, rj);
return;
}
p = flx_dns_packet_new_response(s->interface->mtu - 200);
d = packet_add_response_job(s, p, rj);
g_assert(d);
n = 1;
/* Try to fill up packet with more responses, if available */
for (rj = s->response_jobs; rj; rj = rj->jobs_next) {
if (rj->done)
continue;
if (!packet_add_response_job(s, p, rj))
break;
n++;
}
flx_dns_packet_set_field(p, DNS_FIELD_ANCOUNT, n);
flx_interface_send_packet(s->interface, s->protocol, p);
flx_dns_packet_free(p);
}
static flxResponseJob* look_for_response(flxPacketScheduler *s, flxRecord *record) {
flxResponseJob *rj;
g_assert(s);
g_assert(record);
for (rj = s->response_jobs; rj; rj = rj->jobs_next)
if (flx_record_equal(rj->record, record))
return rj;
return NULL;
}
void flx_packet_scheduler_post_response(flxPacketScheduler *s, flxRecord *record) {
flxResponseJob *rj;
GTimeVal tv;
g_assert(s);
g_assert(record);
if (look_for_response(s, record))
return;
rj = g_new(flxResponseJob, 1);
rj->record = flx_record_ref(record);
rj->done = FALSE;
flx_elapse_time(&tv, 20, 100);
rj->time_event = flx_time_event_queue_add(s->server->time_event_queue, &tv, response_elapse, rj);
rj->scheduler = s;
FLX_LLIST_PREPEND(flxResponseJob, jobs, s->response_jobs, rj);
}
void flx_packet_scheduler_drop_query(flxPacketScheduler *s, flxKey *key) {
flxQueryJob *qj;
g_assert(s);
g_assert(key);
for (qj = s->query_jobs; qj; qj = qj->jobs_next)
if (flx_key_equal(qj->key, key)) {
if (!qj->done) {
GTimeVal tv;
qj->done = TRUE;
/* Drop query after 100ms from history */
flx_elapse_time(&tv, 100, 0);
flx_time_event_queue_update(s->server->time_event_queue, qj->time_event, &tv);
}
break;
}
}
void flx_packet_scheduler_drop_response(flxPacketScheduler *s, flxRecord *record) {
flxResponseJob *rj;
g_assert(s);
g_assert(record);
for (rj = s->response_jobs; rj; rj = rj->jobs_next)
if (flx_record_equal(rj->record, record)) {
if (!rj->done) {
GTimeVal tv;
rj->done = TRUE;
/* Drop response after 100ms from history */
flx_elapse_time(&tv, 100, 0);
flx_time_event_queue_update(s->server->time_event_queue, rj->time_event, &tv);
}
break;
}
}
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