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/*
This file is part of GNUnet
Copyright (C) 2004, 2009 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file fragmentation/test_fragmentation.c
* @brief test for fragmentation.c
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_fragmentation_lib.h"
#define DETAILS GNUNET_NO
/**
* Number of messages to transmit (note: each uses ~32k memory!)
*/
#define NUM_MSGS 500
/**
* MTU to force on fragmentation (must be > 1k + 12)
*/
#define MTU 1111
/**
* Simulate dropping of 1 out of how many messages? (must be > 1)
*/
#define DROPRATE 5
static int ret = 1;
static unsigned int dups;
static unsigned int fragc;
static unsigned int frag_drops;
static unsigned int acks;
static unsigned int ack_drops;
static struct GNUNET_DEFRAGMENT_Context *defrag;
static struct GNUNET_BANDWIDTH_Tracker trackers[NUM_MSGS];
static struct GNUNET_FRAGMENT_Context *frags[NUM_MSGS];
static struct GNUNET_SCHEDULER_Task *shutdown_task;
static void
do_shutdown (void *cls)
{
unsigned int i;
ret = 0;
shutdown_task = NULL;
GNUNET_DEFRAGMENT_context_destroy (defrag);
defrag = NULL;
for (i = 0; i < NUM_MSGS; i++)
{
if (frags[i] == NULL)
continue;
GNUNET_FRAGMENT_context_destroy (frags[i], NULL, NULL);
frags[i] = NULL;
}
}
static void
proc_msgs (void *cls, const struct GNUNET_MessageHeader *hdr)
{
static unsigned int total;
unsigned int i;
const char *buf;
#if DETAILS
FPRINTF (stderr, "%s", "!"); /* message complete, good! */
#endif
buf = (const char *) hdr;
for (i = sizeof (struct GNUNET_MessageHeader); i < ntohs (hdr->size); i++)
GNUNET_assert (buf[i] == (char) i);
total++;
#if ! DETAILS
if (0 == (total % (NUM_MSGS / 100)))
FPRINTF (stderr, "%s", ".");
#endif
/* tolerate 10% loss, i.e. due to duplicate fragment IDs */
if ((total >= NUM_MSGS - (NUM_MSGS / 10)) && (ret != 0))
{
if (NULL == shutdown_task)
shutdown_task = GNUNET_SCHEDULER_add_now (&do_shutdown, NULL);
}
}
/**
* Process ACK (by passing to fragmenter)
*/
static void
proc_acks (void *cls, uint32_t msg_id, const struct GNUNET_MessageHeader *hdr)
{
unsigned int i;
int ret;
if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, DROPRATE))
{
ack_drops++;
return; /* random drop */
}
for (i = 0; i < NUM_MSGS; i++)
{
if (frags[i] == NULL)
continue;
ret = GNUNET_FRAGMENT_process_ack (frags[i], hdr);
if (ret == GNUNET_OK)
{
#if DETAILS
FPRINTF (stderr, "%s", "@"); /* good ACK */
#endif
GNUNET_FRAGMENT_context_destroy (frags[i], NULL, NULL);
frags[i] = NULL;
acks++;
return;
}
if (ret == GNUNET_NO)
{
#if DETAILS
FPRINTF (stderr, "%s", "@"); /* good ACK */
#endif
acks++;
return;
}
}
#if DETAILS
FPRINTF (stderr, "%s", "_"); /* BAD: ack that nobody feels responsible for... */
#endif
}
/**
* Process fragment (by passing to defrag).
*/
static void
proc_frac (void *cls, const struct GNUNET_MessageHeader *hdr)
{
struct GNUNET_FRAGMENT_Context **fc = cls;
int ret;
GNUNET_FRAGMENT_context_transmission_done (*fc);
if (0 == GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, DROPRATE))
{
frag_drops++;
return; /* random drop */
}
if (NULL == defrag)
{
FPRINTF (stderr, "%s", "E"); /* Error: frag after shutdown!? */
return;
}
ret = GNUNET_DEFRAGMENT_process_fragment (defrag, hdr);
if (ret == GNUNET_NO)
{
#if DETAILS
FPRINTF (stderr, "%s", "?"); /* duplicate fragment */
#endif
dups++;
}
else if (ret == GNUNET_OK)
{
#if DETAILS
FPRINTF (stderr, "%s", "."); /* good fragment */
#endif
fragc++;
}
}
/**
* Main function run with scheduler.
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
unsigned int i;
struct GNUNET_MessageHeader *msg;
char buf[MTU + 32 * 1024];
defrag = GNUNET_DEFRAGMENT_context_create (NULL, MTU, NUM_MSGS /* enough space for all */
, NULL, &proc_msgs, &proc_acks);
for (i = 0; i < sizeof (buf); i++)
buf[i] = (char) i;
msg = (struct GNUNET_MessageHeader *) buf;
for (i = 0; i < NUM_MSGS; i++)
{
msg->type = htons ((uint16_t) i);
msg->size =
htons (sizeof (struct GNUNET_MessageHeader) + (17 * i) % (32 * 1024));
frags[i] = GNUNET_FRAGMENT_context_create (NULL /* no stats */ ,
MTU, &trackers[i],
GNUNET_TIME_UNIT_MILLISECONDS,
GNUNET_TIME_UNIT_SECONDS,
msg,
&proc_frac, &frags[i]);
}
}
int
main (int argc, char *argv[])
{
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_OPTION_END
};
char *const argv_prog[] = {
"test-fragmentation",
"-c",
"test_fragmentation_data.conf",
"-L",
"WARNING",
NULL
};
unsigned int i;
GNUNET_log_setup ("test-fragmentation",
"WARNING",
NULL);
for (i = 0; i < NUM_MSGS; i++)
GNUNET_BANDWIDTH_tracker_init (&trackers[i], NULL, NULL,
GNUNET_BANDWIDTH_value_init ((i + 1) * 1024),
100);
GNUNET_PROGRAM_run (5, argv_prog, "test-fragmentation", "nohelp", options,
&run, NULL);
FPRINTF (stderr,
"\nHad %u good fragments, %u duplicate fragments, %u acks and %u simulated drops of acks\n",
fragc, dups, acks, ack_drops);
return ret;
}
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