// Connect to the server, and send the first datagram
void initiate_tx(void) {
sockfd = Socket(AF_INET, SOCK_DGRAM, 0);
if (conn->is_local) {
set_dontroute(sockfd);
}
// Bind to port 0
Bind(sockfd, conn->cli_sa, (socklen_t)sizeof(SA));
struct sockaddr_in sin;
UINT addrlen = sizeof(SA);
// Fetch port number at which kernel bound this socket.
Getsockname(sockfd, (SA *)&sin, &addrlen);
cliport = ntohs(sin.sin_port);
INFO("Client's ephemeral Port Number: %d\n", cliport);
// Connect to the server.
Connect(sockfd, conn->serv_sa, sizeof(SA));
// TODO
// Do we need getpeername here?
// Start a timer here to re-send the file name till we receive an
// ACK.
struct timeval timeout;
timeout.tv_sec = 3;
timeout.tv_usec = 0;
fdset_init(&fds, timeout, ack_timeout);
fdset_add(&fds, &fds.rev, sockfd, &sockfd, send_file);
fdset_add(&fds, &fds.exev, sockfd, &sockfd, handle_tx_error);
// Send the packet to the server
INFO("Trying to send the SYN packet to the Server with the file name%s\n", "");
send_filename_pkt();
int r = fdset_poll2(&fds);
if (r < 0) {
perror("select");
ASSERT(errno != EINTR);
exit(1);
}
}
void
server_loop(void) {
struct timeval timeout;
int r;
VERBOSE("server_loop()%s\n", "");
timeout.tv_sec = 10; // FIXME when we know better
timeout.tv_usec = 0;
fdset_init(&fds, timeout, NULL);
fdset_add(&fds, &fds.rev, s.sockfd, &s.sockfd, on_recv);
fdset_add(&fds, &fds.exev, s.sockfd, &s.sockfd, on_error);
r = fdset_poll(&fds, &timeout, on_recv_timedout);
if (r < 0) {
perror("select");
ASSERT(errno != EINTR);
exit(1);
}
}
int tcp_master(dthread_t *thread)
{
if (!thread || !thread->data) {
return KNOT_EINVAL;
}
iohandler_t *handler = (iohandler_t *)thread->data;
unsigned *iostate = &handler->thread_state[dt_get_id(thread)];
int ret = KNOT_EOK;
ref_t *ref = NULL;
tcp_context_t tcp;
memset(&tcp, 0, sizeof(tcp_context_t));
/* Create big enough memory cushion. */
knot_mm_t mm;
mm_ctx_mempool(&mm, 16 * MM_DEFAULT_BLKSIZE);
/* Create TCP answering context. */
tcp.server = handler->server;
tcp.thread_id = handler->thread_id[dt_get_id(thread)];
tcp.overlay.mm = &mm;
/* Prepare structures for bound sockets. */
conf_val_t val = conf_get(conf(), C_SRV, C_LISTEN);
fdset_init(&tcp.set, conf_val_count(&val) + CONF_XFERS);
/* Create iovec abstraction. */
for (unsigned i = 0; i < 2; ++i) {
tcp.iov[i].iov_len = KNOT_WIRE_MAX_PKTSIZE;
tcp.iov[i].iov_base = malloc(tcp.iov[i].iov_len);
if (tcp.iov[i].iov_base == NULL) {
ret = KNOT_ENOMEM;
goto finish;
}
}
/* Initialize sweep interval. */
timev_t next_sweep = {0};
time_now(&next_sweep);
next_sweep.tv_sec += TCP_SWEEP_INTERVAL;
for(;;) {
/* Check handler state. */
if (unlikely(*iostate & ServerReload)) {
*iostate &= ~ServerReload;
/* Cancel client connections. */
for (unsigned i = tcp.client_threshold; i < tcp.set.n; ++i) {
close(tcp.set.pfd[i].fd);
}
ref_release(ref);
ref = server_set_ifaces(handler->server, &tcp.set, IO_TCP, tcp.thread_id);
if (tcp.set.n == 0) {
break; /* Terminate on zero interfaces. */
}
tcp.client_threshold = tcp.set.n;
}
/* Check for cancellation. */
if (dt_is_cancelled(thread)) {
break;
}
/* Serve client requests. */
tcp_wait_for_events(&tcp);
/* Sweep inactive clients. */
if (tcp.last_poll_time.tv_sec >= next_sweep.tv_sec) {
fdset_sweep(&tcp.set, &tcp_sweep, NULL);
time_now(&next_sweep);
next_sweep.tv_sec += TCP_SWEEP_INTERVAL;
}
}
finish:
free(tcp.iov[0].iov_base);
free(tcp.iov[1].iov_base);
mp_delete(mm.ctx);
fdset_clear(&tcp.set);
ref_release(ref);
return ret;
}
int main(int argc, char *argv[])
{
plan(12);
/* 1. Create fdset. */
fdset_t set;
int ret = fdset_init(&set, 32);
is_int(0, ret, "fdset: init");
/* 2. Create pipe. */
int fds[2], tmpfds[2];
ret = pipe(fds);
ok(ret >= 0, "fdset: pipe() works");
ret = pipe(tmpfds);
ok(ret >= 0, "fdset: 2nd pipe() works");
/* 3. Add fd to set. */
ret = fdset_add(&set, fds[0], POLLIN, NULL);
is_int(0, ret, "fdset: add to set works");
fdset_add(&set, tmpfds[0], POLLIN, NULL);
/* Schedule write. */
struct timeval ts, te;
gettimeofday(&ts, 0);
pthread_t t;
pthread_create(&t, 0, thr_action, &fds[1]);
/* 4. Watch fdset. */
int nfds = poll(set.pfd, set.n, 60 * 1000);
gettimeofday(&te, 0);
size_t diff = timeval_diff(&ts, &te);
ok(nfds > 0, "fdset: poll returned %d events in %zu ms", nfds, diff);
/* 5. Prepare event set. */
ok(set.pfd[0].revents & POLLIN, "fdset: pipe is active");
/* 6. Receive data. */
char buf = 0x00;
ret = read(set.pfd[0].fd, &buf, WRITE_PATTERN_LEN);
ok(ret >= 0 && buf == WRITE_PATTERN, "fdset: contains valid data");
/* 7-9. Remove from event set. */
ret = fdset_remove(&set, 0);
is_int(0, ret, "fdset: remove from fdset works");
close(fds[0]);
close(fds[1]);
ret = fdset_remove(&set, 0);
close(tmpfds[1]);
close(tmpfds[1]);
is_int(0, ret, "fdset: remove from fdset works (2)");
ret = fdset_remove(&set, 0);
ok(ret != 0, "fdset: removing nonexistent item");
/* 10. Crash test. */
fdset_init(0, 0);
fdset_add(0, 1, 1, 0);
fdset_add(0, 0, 1, 0);
fdset_remove(0, 1);
fdset_remove(0, 0);
ok(1, "fdset: crash test successful");
/* 11. Destroy fdset. */
ret = fdset_clear(&set);
is_int(0, ret, "fdset: destroyed");
/* Cleanup. */
pthread_join(t, 0);
return 0;
}