/* process command within a request
*/
static int
process_command( int new_sockfd, struct server_ctx* ctx,
const char* param, size_t plen )
{
int rc = 0;
const int STAT_OPTIONS = 0;
const int RESTART_OPTIONS = MSO_SKIP_CLIENTS | MSO_RESTART;
assert( (new_sockfd > 0) && ctx && param );
if( 0 == strncmp( ctx->cmd, CMD_UDP, sizeof(ctx->cmd) ) ||
0 == strncmp( ctx->cmd, CMD_RTP, sizeof(ctx->cmd) ) ) {
if( ctx->clfree ) {
rc = udp_relay( new_sockfd, param, plen,
&(ctx->mcast_inaddr), ctx );
}
else {
send_http_response( new_sockfd, 401, "Bad request" );
(void)tmfprintf( g_flog, "Client limit [%d] has been reached.\n",
ctx->clmax);
}
}
else if( 0 == strncmp( ctx->cmd, CMD_STATUS, sizeof(ctx->cmd) ) ) {
rc = report_status( new_sockfd, ctx, STAT_OPTIONS );
}
else if( 0 == strncmp( ctx->cmd, CMD_RESTART, sizeof(ctx->cmd) ) ) {
(void) report_status( new_sockfd, ctx, RESTART_OPTIONS );
terminate_all_clients( ctx );
wait_all( ctx );
}
else {
TRACE( (void)tmfprintf( g_flog, "Unrecognized command [%s]"
" - ignoring.\n", ctx->cmd) );
send_http_response( new_sockfd, 401, "Unrecognized request" );
}
return rc;
}
/* process client requests */
int
srv_loop( const char* ipaddr, int port,
const char* mcast_addr )
{
int rc, maxfd, err, nrdy, i;
fd_set rset;
struct timeval tmout, idle_tmout, *ptmout = NULL;
tmfd_t *asock = NULL;
size_t n = 0, nasock = 0, max_nasock = LQ_BACKLOG;
sigset_t oset, bset;
static const long IDLE_TMOUT_SEC = 30;
assert( (port > 0) && mcast_addr && ipaddr );
(void)tmfprintf( g_flog, "Server is starting up, max clients = [%u]\n",
g_uopt.max_clients );
asock = calloc (max_nasock, sizeof(*asock));
if (!asock) {
mperror (g_flog, ENOMEM, "%s: calloc", __func__);
return ERR_INTERNAL;
}
init_server_ctx( &g_srv, g_uopt.max_clients,
(ipaddr[0] ? ipaddr : "0.0.0.0") , (uint16_t)port, mcast_addr );
g_srv.rcv_tmout = (u_short)g_uopt.rcv_tmout;
g_srv.snd_tmout = RLY_SOCK_TIMEOUT;
/* NB: server socket is non-blocking! */
if( 0 != (rc = setup_listener( ipaddr, port, &g_srv.lsockfd,
g_uopt.lq_backlog )) ) {
return rc;
}
sigemptyset (&bset);
sigaddset (&bset, SIGINT);
sigaddset (&bset, SIGQUIT);
sigaddset (&bset, SIGCHLD);
sigaddset (&bset, SIGTERM);
(void) sigprocmask (SIG_BLOCK, &bset, &oset);
TRACE( (void)tmfprintf( g_flog, "Entering server loop [%s]\n",
SLOOP_TAG) );
while (1) {
FD_ZERO( &rset );
FD_SET( g_srv.lsockfd, &rset );
FD_SET( g_srv.cpipe[0], &rset );
maxfd = (g_srv.lsockfd > g_srv.cpipe[0] ) ? g_srv.lsockfd : g_srv.cpipe[0];
for (i = 0; (size_t)i < nasock; ++i) {
assert (asock[i].fd >= 0);
FD_SET (asock[i].fd, &rset);
if (asock[i].fd > maxfd) maxfd = asock[i].fd;
}
/* if there are accepted sockets - apply specified time-out
*/
tmout.tv_sec = g_uopt.ssel_tmout;
tmout.tv_usec = 0;
idle_tmout.tv_sec = IDLE_TMOUT_SEC;
idle_tmout.tv_usec = 0;
/* enforce *idle* select(2) timeout to alleviate signal contention */
ptmout = ((nasock > 0) && (g_uopt.ssel_tmout > 0)) ? &tmout : &idle_tmout;
TRACE( (void)tmfprintf( g_flog, "Waiting for input from [%ld] fd's, "
"%s timeout\n", (long)(2 + nasock), (ptmout ? "with" : "NO")));
if (ptmout && ptmout->tv_sec) {
TRACE( (void)tmfprintf (g_flog, "select() timeout set to "
"[%ld] seconds\n", ptmout->tv_sec) );
}
(void) sigprocmask (SIG_UNBLOCK, &bset, NULL);
if( must_quit() ) {
TRACE( (void)tmfputs( "Must quit now\n", g_flog ) );
rc = 0; break;
}
nrdy = select (maxfd + 1, &rset, NULL, NULL, ptmout);
err = errno;
(void) sigprocmask (SIG_BLOCK, &bset, NULL);
if( must_quit() ) {
TRACE( (void)tmfputs( "Must quit now\n", g_flog ) );
rc = 0; break;
}
wait_terminated( &g_srv );
if( nrdy < 0 ) {
if (EINTR == err) {
TRACE( (void)tmfputs ("INTERRUPTED, yet "
"will continue.\n", g_flog) );
rc = 0; continue;
}
mperror( g_flog, err, "%s: select", __func__ );
break;
}
TRACE( (void)tmfprintf (g_flog, "Got %ld requests\n", (long)nrdy) );
if (0 == nrdy) { /* time-out */
tmout_requests (asock, &nasock);
rc = 0; continue;
}
if( FD_ISSET(g_srv.cpipe[0], &rset) ) {
(void) tpstat_read( &g_srv );
if (--nrdy <= 0) continue;
}
if ((0 < nasock) &&
(0 < (nrdy - (FD_ISSET(g_srv.lsockfd, &rset) ? 1 : 0)))) {
process_requests (asock, &nasock, &rset, &g_srv);
/* n now contains # (yet) unprocessed accepted sockets */
}
if (FD_ISSET(g_srv.lsockfd, &rset)) {
if (nasock >= max_nasock) {
(void) tmfprintf (g_flog, "Cannot accept sockets beyond "
"the limit [%ld/%ld], skipping\n",
(long)nasock, (long)max_nasock);
}
else {
n = max_nasock - nasock; /* append asock */
accept_requests (g_srv.lsockfd, &(asock[nasock]), &n);
nasock += n;
}
}
} /* server loop */
TRACE( (void)tmfprintf( g_flog, "Exited server loop [%s]\n", SLOOP_TAG) );
for (i = 0; (size_t)i < nasock; ++i) {
if (asock[i].fd > 0) (void) close (asock[i].fd);
}
free (asock);
/* receive additional (blocked signals) */
(void) sigprocmask (SIG_SETMASK, &oset, NULL);
wait_terminated( &g_srv );
terminate_all_clients( &g_srv );
wait_all( &g_srv );
if (0 != close( g_srv.lsockfd )) {
mperror (g_flog, errno, "server socket close");
}
free_server_ctx( &g_srv );
(void)tmfprintf( g_flog, "Server exits with rc=[%d]\n", rc );
return rc;
}
