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/* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only */
/* Copyright (c) 2017-2024 Brett Sheffield <bacs@librecast.net> */
#include "testnet.h"
#include <librecast/crypto.h>
#include <librecast/net.h>
#include <assert.h>
#include <pthread.h>
#include <fcntl.h>
#include <stdio.h>
#include <semaphore.h>
#include <unistd.h>
#include <sys/param.h>
#undef TESTDEBUG
#ifdef TESTDEBUG
# define PKTS 10
# define PKTSZ 4
#else
# define PKTS 20
# define PKTSZ 1024
#endif
#define WAITS 20
#ifdef HAVE_LIBSODIUM
#ifdef HAVE_LIBLCRQ
enum {
TID_SEND,
TID_RECV
};
static const size_t SZ = PKTS * PKTSZ + 5;
static char channel_name[] = "0000-0040";
static sem_t receiver_ready, timeout;
static int fec;
static unsigned char key[crypto_secretbox_KEYBYTES];
#ifdef TESTDEBUG
#if 0
static void dumppkt(uint8_t *pkt, int haseq)
{
uint16_t seq;
uint8_t *dat = pkt;
if (haseq) {
dat += sizeof seq;
seq = ntohs(*(uint16_t *)pkt);
fprintf(stderr, "%u: ", seq);
}
else fprintf(stderr, " ");
for (size_t z = 0; z < PKTSZ * 8; z++) {
if (isset(dat, z)) putc('1', stderr);
else putc('0', stderr);
}
putc('\n', stderr);
}
#endif
static void dump_bufs(uint8_t buf[2][SZ])
{
for (size_t p = 0; p < PKTS; p++) {
fprintf(stderr, "%zu: ", p);
for (int i = 0; i < 2; i++) {
for (size_t z = 0; z < PKTSZ * 8; z++) {
uint8_t *b = buf[i];
if (isset(b, p * PKTSZ * 8 + z)) putc('1', stderr);
else putc('0', stderr);
}
putc(' ', stderr);
}
putc('\n', stderr);
}
putc('\n', stderr);
}
#endif
static void generate_source_data(uint8_t *buf, size_t sz)
{
ssize_t rc;
int f;
f = open("/dev/urandom", O_RDONLY);
if (f == -1) return;
rc = read(f, buf, sz);
test_assert(rc == (ssize_t)sz, "%zi random bytes read", rc);
close(f);
}
static void *recv_data_fec(void *arg)
{
uint8_t *buf = (uint8_t *)arg;
ssize_t rc;
lc_ctx_t *lctx = lc_ctx_new();
lc_socket_t * sock = lc_socket_new(lctx);
lc_channel_t * chan = lc_channel_new(lctx, channel_name);
memset(buf, 0, SZ); /* clear receive buffer */
lc_channel_bind(sock, chan);
lc_channel_join(chan);
lc_channel_set_sym_key(chan, key, crypto_secretbox_KEYBYTES);
lc_channel_coding_set(chan, LC_CODE_SYMM | LC_CODE_FEC_RQ);
sem_post(&receiver_ready);
rc = lc_channel_recv(chan, buf, SZ, 0);
test_log("lc_channel_recv returned %zi\n", rc);
test_assert(rc >= (ssize_t)SZ, "data received %zi/%zu bytes", rc, SZ);
lc_channel_part(chan);
lc_ctx_free(lctx);
sem_post(&timeout);
return arg;
}
static void *send_data_fec(void *arg)
{
uint8_t *buf = (uint8_t *)arg;
lc_ctx_t *lctx;
lc_socket_t *sock;
lc_channel_t *chan;
rq_t *rq;
ssize_t rc;
size_t byt = 0;
lctx = lc_ctx_new();
pthread_cleanup_push((void (*)(void *))lc_ctx_free, lctx);
sock = lc_socket_new(lctx);
chan = lc_channel_new(lctx, channel_name);
lc_socket_loop(sock, 1);
lc_channel_bind(sock, chan);
lc_channel_set_sym_key(chan, key, crypto_secretbox_KEYBYTES);
lc_channel_coding_set(chan, LC_CODE_SYMM | LC_CODE_FEC_RQ);
test_log("sending data with FEC + symmetric encryption\n");
sem_wait(&receiver_ready);
rc = lc_channel_send(chan, buf, SZ, 0);
test_assert(rc > 0, "lc_channel_send encoded data, returned %zi", rc);
if (rc == -1) goto err_ctx_free;
byt = rc;
rq = lc_channel_rq(chan);
/* Send packets. Drop packet 3 */
int pkts = rq_KP(rq) + RQ_OVERHEAD * 2;
test_log("sending %u packets\n", pkts);
for (int i = 1; i < pkts; i++) {
int flags = (i == 3) ? MSG_DROP : 0;
rc = lc_channel_send(chan, NULL, 0, flags);
test_assert(rc > 0, "lc_channel_send encoded data, returned %zi", rc);
if (rc > 0) byt += rc;
}
test_assert(byt >= SZ, "data sent %zi bytes (buffer = %zu)", byt, SZ);
err_ctx_free:
pthread_cleanup_pop(1); /* lc_ctx_free(lctx); */
return arg;
}
#endif
#endif
int main(void)
{
#if !defined(HAVE_LIBLCRQ) || !(HAVE_LIBSODIUM)
return test_skip("lc_channel_send() / lc_socket_recv() - FEC + encrypt");
#else
pthread_t tid[2];
uint8_t buf[2][SZ];
struct timespec ts;
test_name("lc_channel_send() / lc_socket_recv() - FEC + encrypt");
test_require_net(TEST_NET_BASIC);
/* run test twice */
for (fec = 0; fec < 2; fec++) {
/* generate symmetric encryption key */
crypto_secretbox_keygen(key);
/* clear buffers */
memset(buf[0], 0, SZ);
memset(buf[1], 0, SZ);
sem_init(&timeout, 0, 0);
sem_init(&receiver_ready, 0, 0);
generate_source_data(buf[TID_SEND], SZ);
test_assert(memcmp(buf[TID_RECV], buf[TID_SEND], SZ), "buffer differ before sync");
pthread_create(&tid[TID_SEND], NULL, &send_data_fec, buf[TID_SEND]);
pthread_create(&tid[TID_RECV], NULL, &recv_data_fec, buf[TID_RECV]);
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += WAITS;
test_assert(!sem_timedwait(&timeout, &ts), "timeout");
pthread_cancel(tid[TID_RECV]);
pthread_join(tid[TID_RECV], NULL);
pthread_cancel(tid[TID_SEND]);
pthread_join(tid[TID_SEND], NULL);
sem_destroy(&receiver_ready);
sem_destroy(&timeout);
test_assert(!memcmp(buf[TID_RECV], buf[TID_SEND], SZ), "send buffer matches received");
#ifdef TESTDEBUG
dump_bufs(buf);
#endif
}
return test_status;
#endif
}
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