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/* Copyright (c) 2014, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/* Unit tests for OOM handling logic */
#define RELAY_PRIVATE
#define BUFFERS_PRIVATE
#define CIRCUITLIST_PRIVATE
#include "or.h"
#include "buffers.h"
#include "circuitlist.h"
#include "compat_libevent.h"
#include "connection.h"
#include "config.h"
#include "mempool.h"
#include "relay.h"
#include "test.h"
/* small replacement mock for circuit_mark_for_close_ to avoid doing all
* the other bookkeeping that comes with marking circuits. */
static void
circuit_mark_for_close_dummy_(circuit_t *circ, int reason, int line,
const char *file)
{
(void) reason;
if (circ->marked_for_close) {
TT_FAIL(("Circuit already marked for close at %s:%d, but we are marking "
"it again at %s:%d",
circ->marked_for_close_file, (int)circ->marked_for_close,
file, line));
}
circ->marked_for_close = line;
circ->marked_for_close_file = file;
}
static circuit_t *
dummy_or_circuit_new(int n_p_cells, int n_n_cells)
{
or_circuit_t *circ = or_circuit_new(0, NULL);
int i;
cell_t cell;
for (i=0; i < n_p_cells; ++i) {
crypto_rand((void*)&cell, sizeof(cell));
cell_queue_append_packed_copy(TO_CIRCUIT(circ), &circ->p_chan_cells,
0, &cell, 1, 0);
}
for (i=0; i < n_n_cells; ++i) {
crypto_rand((void*)&cell, sizeof(cell));
cell_queue_append_packed_copy(TO_CIRCUIT(circ),
&TO_CIRCUIT(circ)->n_chan_cells,
1, &cell, 1, 0);
}
TO_CIRCUIT(circ)->purpose = CIRCUIT_PURPOSE_OR;
return TO_CIRCUIT(circ);
}
static circuit_t *
dummy_origin_circuit_new(int n_cells)
{
origin_circuit_t *circ = origin_circuit_new();
int i;
cell_t cell;
for (i=0; i < n_cells; ++i) {
crypto_rand((void*)&cell, sizeof(cell));
cell_queue_append_packed_copy(TO_CIRCUIT(circ),
&TO_CIRCUIT(circ)->n_chan_cells,
1, &cell, 1, 0);
}
TO_CIRCUIT(circ)->purpose = CIRCUIT_PURPOSE_C_GENERAL;
return TO_CIRCUIT(circ);
}
#if 0
static void
add_bytes_to_buf(generic_buffer_t *buf, size_t n_bytes)
{
char b[3000];
while (n_bytes) {
size_t this_add = n_bytes > sizeof(buf) ? sizeof(buf) : n_bytes;
crypto_rand(b, sizeof(b));
generic_buffer_add(buf, b, this_add);
n_bytes -= this_add;
}
}
static edge_connection_t *
dummy_edge_conn_new(int type, size_t in_bytes, size_t out_bytes)
{
edge_connection_t *conn = edge_connection_new(type, AF_INET);
/* We add these bytes directly to the buffers, to avoid all the
* edge connection read/write machinery. */
add_bytes_to_buf(TO_CONN(conn)->inbuf, in_bytes);
add_bytes_to_buf(TO_CONN(conn)->outbuf, out_bytes);
return conn;
}
#endif
/** Run unit tests for buffers.c */
static void
test_oom_circbuf(void *arg)
{
or_options_t *options = get_options_mutable();
circuit_t *c1 = NULL, *c2 = NULL, *c3 = NULL, *c4 = NULL;
struct timeval tv = { 1389631048, 0 };
(void) arg;
MOCK(circuit_mark_for_close_, circuit_mark_for_close_dummy_);
init_cell_pool();
/* Far too low for real life. */
options->MaxMemInQueues = 256*packed_cell_mem_cost();
options->CellStatistics = 0;
tt_int_op(cell_queues_check_size(), ==, 0); /* We don't start out OOM. */
tt_int_op(cell_queues_get_total_allocation(), ==, 0);
tt_int_op(buf_get_total_allocation(), ==, 0);
/* Now we're going to fake up some circuits and get them added to the global
circuit list. */
tv.tv_usec = 0;
tor_gettimeofday_cache_set(&tv);
c1 = dummy_origin_circuit_new(30);
tv.tv_usec = 10*1000;
tor_gettimeofday_cache_set(&tv);
c2 = dummy_or_circuit_new(20, 20);
tt_int_op(packed_cell_mem_cost(), ==,
sizeof(packed_cell_t) + MP_POOL_ITEM_OVERHEAD);
tt_int_op(cell_queues_get_total_allocation(), ==,
packed_cell_mem_cost() * 70);
tt_int_op(cell_queues_check_size(), ==, 0); /* We are still not OOM */
tv.tv_usec = 20*1000;
tor_gettimeofday_cache_set(&tv);
c3 = dummy_or_circuit_new(100, 85);
tt_int_op(cell_queues_check_size(), ==, 0); /* We are still not OOM */
tt_int_op(cell_queues_get_total_allocation(), ==,
packed_cell_mem_cost() * 255);
tv.tv_usec = 30*1000;
tor_gettimeofday_cache_set(&tv);
/* Adding this cell will trigger our OOM handler. */
c4 = dummy_or_circuit_new(2, 0);
tt_int_op(cell_queues_get_total_allocation(), ==,
packed_cell_mem_cost() * 257);
tt_int_op(cell_queues_check_size(), ==, 1); /* We are now OOM */
tt_assert(c1->marked_for_close);
tt_assert(! c2->marked_for_close);
tt_assert(! c3->marked_for_close);
tt_assert(! c4->marked_for_close);
tt_int_op(cell_queues_get_total_allocation(), ==,
packed_cell_mem_cost() * (257 - 30));
circuit_free(c1);
tv.tv_usec = 0;
tor_gettimeofday_cache_set(&tv); /* go back in time */
c1 = dummy_or_circuit_new(90, 0);
tv.tv_usec = 40*1000; /* go back to the future */
tor_gettimeofday_cache_set(&tv);
tt_int_op(cell_queues_check_size(), ==, 1); /* We are now OOM */
tt_assert(c1->marked_for_close);
tt_assert(! c2->marked_for_close);
tt_assert(! c3->marked_for_close);
tt_assert(! c4->marked_for_close);
tt_int_op(cell_queues_get_total_allocation(), ==,
packed_cell_mem_cost() * (257 - 30));
done:
circuit_free(c1);
circuit_free(c2);
circuit_free(c3);
circuit_free(c4);
UNMOCK(circuit_mark_for_close_);
}
struct testcase_t oom_tests[] = {
{ "circbuf", test_oom_circbuf, TT_FORK, NULL, NULL },
END_OF_TESTCASES
};
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