/*
* This function performs a shutdown-read on a stream interface attached to
* a connection in a connected or init state (it does nothing for other
* states). It either shuts the read side or marks itself as closed. The buffer
* flags are updated to reflect the new state. If the stream interface has
* SI_FL_NOHALF, we also forward the close to the write side. If a control
* layer is defined, then it is supposed to be a socket layer and file
* descriptors are then shutdown or closed accordingly. The function
* automatically disables polling if needed.
*/
static void stream_int_shutr_conn(struct stream_interface *si)
{
struct connection *conn = __objt_conn(si->end);
si->ib->flags &= ~CF_SHUTR_NOW;
if (si->ib->flags & CF_SHUTR)
return;
si->ib->flags |= CF_SHUTR;
si->ib->rex = TICK_ETERNITY;
si->flags &= ~SI_FL_WAIT_ROOM;
if (si->state != SI_ST_EST && si->state != SI_ST_CON)
return;
if (si->ob->flags & CF_SHUTW) {
conn_full_close(conn);
si->state = SI_ST_DIS;
si->exp = TICK_ETERNITY;
}
else if (si->flags & SI_FL_NOHALF) {
/* we want to immediately forward this close to the write side */
return stream_int_shutw_conn(si);
}
else if (conn->ctrl) {
/* we want the caller to disable polling on this FD */
conn_data_stop_recv(conn);
}
}
/*
* This function propagates a null read received on a socket-based connection.
* It updates the stream interface. If the stream interface has SI_FL_NOHALF,
* the close is also forwarded to the write side as an abort. This function is
* still socket-specific as it handles a setsockopt() call to set the SO_LINGER
* state on the socket.
*/
void stream_sock_read0(struct stream_interface *si)
{
struct connection *conn = __objt_conn(si->end);
si->ib->flags &= ~CF_SHUTR_NOW;
if (si->ib->flags & CF_SHUTR)
return;
si->ib->flags |= CF_SHUTR;
si->ib->rex = TICK_ETERNITY;
si->flags &= ~SI_FL_WAIT_ROOM;
if (si->state != SI_ST_EST && si->state != SI_ST_CON)
return;
if (si->ob->flags & CF_SHUTW)
goto do_close;
if (si->flags & SI_FL_NOHALF) {
/* we want to immediately forward this close to the write side */
/* force flag on ssl to keep session in cache */
if (conn->xprt->shutw)
conn->xprt->shutw(conn, 0);
goto do_close;
}
/* otherwise that's just a normal read shutdown */
if (conn_ctrl_ready(conn))
fdtab[conn->t.sock.fd].linger_risk = 0;
__conn_data_stop_recv(conn);
return;
do_close:
/* OK we completely close the socket here just as if we went through si_shut[rw]() */
conn_full_close(conn);
si->ib->flags &= ~CF_SHUTR_NOW;
si->ib->flags |= CF_SHUTR;
si->ib->rex = TICK_ETERNITY;
si->ob->flags &= ~CF_SHUTW_NOW;
si->ob->flags |= CF_SHUTW;
si->ob->wex = TICK_ETERNITY;
si->flags &= ~(SI_FL_WAIT_DATA | SI_FL_WAIT_ROOM);
si->state = SI_ST_DIS;
si->exp = TICK_ETERNITY;
return;
}
/*
* This function propagates a null read received on a socket-based connection.
* It updates the stream interface. If the stream interface has SI_FL_NOHALF,
* the close is also forwarded to the write side as an abort.
*/
void stream_sock_read0(struct stream_interface *si)
{
struct connection *conn = __objt_conn(si->end);
struct channel *ic = si_ic(si);
struct channel *oc = si_oc(si);
HA_DBG("stream_sock_read0\n");
ic->flags &= ~CF_SHUTR_NOW;
if (ic->flags & CF_SHUTR)
return;
ic->flags |= CF_SHUTR;
ic->rex = TICK_ETERNITY;
si->flags &= ~SI_FL_WAIT_ROOM;
if (si->state != SI_ST_EST && si->state != SI_ST_CON)
return;
if (oc->flags & CF_SHUTW)
goto do_close;
if (si->flags & SI_FL_NOHALF) {
/* we want to immediately forward this close to the write side */
/* force flag on ssl to keep stream in cache */
conn_data_shutw_hard(conn);
goto do_close;
}
/* otherwise that's just a normal read shutdown */
__conn_data_stop_recv(conn);
return;
do_close:
/* OK we completely close the socket here just as if we went through si_shut[rw]() */
conn_full_close(conn);
ic->flags &= ~CF_SHUTR_NOW;
ic->flags |= CF_SHUTR;
ic->rex = TICK_ETERNITY;
oc->flags &= ~CF_SHUTW_NOW;
oc->flags |= CF_SHUTW;
oc->wex = TICK_ETERNITY;
si->flags &= ~(SI_FL_WAIT_DATA | SI_FL_WAIT_ROOM);
si->state = SI_ST_DIS;
si->exp = TICK_ETERNITY;
return;
}
/* This function kills an existing embryonic session. It stops the connection's
* transport layer, releases assigned resources, resumes the listener if it was
* disabled and finally kills the file descriptor. This function requires that
* sess->origin points to the incoming connection.
*/
static void session_kill_embryonic(struct session *sess)
{
int level = LOG_INFO;
struct connection *conn = __objt_conn(sess->origin);
struct task *task = sess->task;
unsigned int log = sess->fe->to_log;
const char *err_msg;
if (sess->fe->options2 & PR_O2_LOGERRORS)
level = LOG_ERR;
if (log && (sess->fe->options & PR_O_NULLNOLOG)) {
/* with "option dontlognull", we don't log connections with no transfer */
if (!conn->err_code ||
conn->err_code == CO_ER_PRX_EMPTY || conn->err_code == CO_ER_PRX_ABORT ||
conn->err_code == CO_ER_CIP_EMPTY || conn->err_code == CO_ER_CIP_ABORT ||
conn->err_code == CO_ER_SSL_EMPTY || conn->err_code == CO_ER_SSL_ABORT)
log = 0;
}
if (log) {
if (!conn->err_code && (task->state & TASK_WOKEN_TIMER)) {
if (conn->flags & CO_FL_ACCEPT_PROXY)
conn->err_code = CO_ER_PRX_TIMEOUT;
else if (conn->flags & CO_FL_ACCEPT_CIP)
conn->err_code = CO_ER_CIP_TIMEOUT;
else if (conn->flags & CO_FL_SSL_WAIT_HS)
conn->err_code = CO_ER_SSL_TIMEOUT;
}
session_prepare_log_prefix(sess);
err_msg = conn_err_code_str(conn);
if (err_msg)
send_log(sess->fe, level, "%s: %s\n", trash.str, err_msg);
else
send_log(sess->fe, level, "%s: unknown connection error (code=%d flags=%08x)\n",
trash.str, conn->err_code, conn->flags);
}
/* kill the connection now */
conn_stop_tracking(conn);
conn_full_close(conn);
conn_free(conn);
task_delete(task);
task_free(task);
session_free(sess);
}
/* This function is used for inter-stream-interface calls. It is called by the
* consumer to inform the producer side that it may be interested in checking
* for free space in the buffer. Note that it intentionally does not update
* timeouts, so that we can still check them later at wake-up. This function is
* dedicated to connection-based stream interfaces.
*/
static void stream_int_chk_rcv_conn(struct stream_interface *si)
{
struct channel *ib = si->ib;
struct connection *conn = __objt_conn(si->end);
if (unlikely(si->state > SI_ST_EST || (ib->flags & CF_SHUTR)))
return;
conn_refresh_polling_flags(conn);
if ((ib->flags & CF_DONT_READ) || channel_full(ib)) {
/* stop reading */
if (!(ib->flags & CF_DONT_READ)) /* full */
si->flags |= SI_FL_WAIT_ROOM;
__conn_data_stop_recv(conn);
}
else {
/* (re)start reading */
si->flags &= ~SI_FL_WAIT_ROOM;
__conn_data_want_recv(conn);
}
conn_cond_update_data_polling(conn);
}
/* prepare the trash with a log prefix for session <sess>. It only works with
* embryonic sessions based on a real connection. This function requires that
* at sess->origin points to the incoming connection.
*/
static void session_prepare_log_prefix(struct session *sess)
{
struct tm tm;
char pn[INET6_ADDRSTRLEN];
int ret;
char *end;
struct connection *cli_conn = __objt_conn(sess->origin);
ret = addr_to_str(&cli_conn->addr.from, pn, sizeof(pn));
if (ret <= 0)
chunk_printf(&trash, "unknown [");
else if (ret == AF_UNIX)
chunk_printf(&trash, "%s:%d [", pn, sess->listener->luid);
else
chunk_printf(&trash, "%s:%d [", pn, get_host_port(&cli_conn->addr.from));
get_localtime(sess->accept_date.tv_sec, &tm);
end = date2str_log(trash.str + trash.len, &tm, &(sess->accept_date), trash.size - trash.len);
trash.len = end - trash.str;
if (sess->listener->name)
chunk_appendf(&trash, "] %s/%s", sess->fe->id, sess->listener->name);
else
chunk_appendf(&trash, "] %s/%d", sess->fe->id, sess->listener->luid);
}
/* Updates the polling status of a connection outside of the connection handler
* based on the channel's flags and the stream interface's flags. It needs to be
* called once after the channels' flags have settled down and the stream has
* been updated. It is not designed to be called from within the connection
* handler itself.
*/
void stream_int_update_conn(struct stream_interface *si)
{
struct channel *ic = si_ic(si);
struct channel *oc = si_oc(si);
struct connection *conn = __objt_conn(si->end);
if (!(ic->flags & CF_SHUTR)) {
/* Read not closed */
if ((ic->flags & CF_DONT_READ) || !channel_may_recv(ic))
__conn_data_stop_recv(conn);
else
__conn_data_want_recv(conn);
}
if (!(oc->flags & CF_SHUTW)) {
/* Write not closed */
if (channel_is_empty(oc))
__conn_data_stop_send(conn);
else
__conn_data_want_send(conn);
}
conn_cond_update_data_polling(conn);
}
/* This function kills an existing embryonic session. It stops the connection's
* transport layer, releases assigned resources, resumes the listener if it was
* disabled and finally kills the file descriptor. This function requires that
* sess->origin points to the incoming connection.
*/
static void session_kill_embryonic(struct session *sess)
{
int level = LOG_INFO;
struct connection *conn = __objt_conn(sess->origin);
struct task *task = conn->owner;
unsigned int log = sess->fe->to_log;
const char *err_msg;
if (sess->fe->options2 & PR_O2_LOGERRORS)
level = LOG_ERR;
if (log && (sess->fe->options & PR_O_NULLNOLOG)) {
/* with "option dontlognull", we don't log connections with no transfer */
if (!conn->err_code ||
conn->err_code == CO_ER_PRX_EMPTY || conn->err_code == CO_ER_PRX_ABORT ||
conn->err_code == CO_ER_SSL_EMPTY || conn->err_code == CO_ER_SSL_ABORT)
log = 0;
}
if (log) {
if (!conn->err_code && (task->state & TASK_WOKEN_TIMER)) {
if (conn->flags & CO_FL_ACCEPT_PROXY)
conn->err_code = CO_ER_PRX_TIMEOUT;
else if (conn->flags & CO_FL_SSL_WAIT_HS)
conn->err_code = CO_ER_SSL_TIMEOUT;
}
session_prepare_log_prefix(sess);
err_msg = conn_err_code_str(conn);
if (err_msg)
send_log(sess->fe, level, "%s: %s\n", trash.str, err_msg);
else
send_log(sess->fe, level, "%s: unknown connection error (code=%d flags=%08x)\n",
trash.str, conn->err_code, conn->flags);
}
/* kill the connection now */
conn_force_close(conn);
conn_free(conn);
sess->fe->feconn--;
if (!(sess->listener->options & LI_O_UNLIMITED))
actconn--;
jobs--;
sess->listener->nbconn--;
if (sess->listener->state == LI_FULL)
resume_listener(sess->listener);
/* Dequeues all of the listeners waiting for a resource */
if (!LIST_ISEMPTY(&global_listener_queue))
dequeue_all_listeners(&global_listener_queue);
if (!LIST_ISEMPTY(&sess->fe->listener_queue) &&
(!sess->fe->fe_sps_lim || freq_ctr_remain(&sess->fe->fe_sess_per_sec, sess->fe->fe_sps_lim, 0) > 0))
dequeue_all_listeners(&sess->fe->listener_queue);
task_delete(task);
task_free(task);
session_free(sess);
}
/* This function is used for inter-stream-interface calls. It is called by the
* producer to inform the consumer side that it may be interested in checking
* for data in the buffer. Note that it intentionally does not update timeouts,
* so that we can still check them later at wake-up.
*/
static void stream_int_chk_snd_conn(struct stream_interface *si)
{
struct channel *ob = si->ob;
struct connection *conn = __objt_conn(si->end);
if (unlikely(si->state > SI_ST_EST || (ob->flags & CF_SHUTW)))
return;
if (unlikely(channel_is_empty(ob))) /* called with nothing to send ! */
return;
if (!ob->pipe && /* spliced data wants to be forwarded ASAP */
!(si->flags & SI_FL_WAIT_DATA)) /* not waiting for data */
return;
if (conn->flags & (CO_FL_DATA_WR_ENA|CO_FL_CURR_WR_ENA)) {
/* already subscribed to write notifications, will be called
* anyway, so let's avoid calling it especially if the reader
* is not ready.
*/
return;
}
/* Before calling the data-level operations, we have to prepare
* the polling flags to ensure we properly detect changes.
*/
conn_refresh_polling_flags(conn);
__conn_data_want_send(conn);
if (!(conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN))) {
si_conn_send(conn);
if (conn->flags & CO_FL_ERROR) {
/* Write error on the file descriptor */
__conn_data_stop_both(conn);
si->flags |= SI_FL_ERR;
goto out_wakeup;
}
}
/* OK, so now we know that some data might have been sent, and that we may
* have to poll first. We have to do that too if the buffer is not empty.
*/
if (channel_is_empty(ob)) {
/* the connection is established but we can't write. Either the
* buffer is empty, or we just refrain from sending because the
* ->o limit was reached. Maybe we just wrote the last
* chunk and need to close.
*/
__conn_data_stop_send(conn);
if (((ob->flags & (CF_SHUTW|CF_AUTO_CLOSE|CF_SHUTW_NOW)) ==
(CF_AUTO_CLOSE|CF_SHUTW_NOW)) &&
(si->state == SI_ST_EST)) {
si_shutw(si);
goto out_wakeup;
}
if ((ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0)
si->flags |= SI_FL_WAIT_DATA;
ob->wex = TICK_ETERNITY;
}
else {
/* Otherwise there are remaining data to be sent in the buffer,
* which means we have to poll before doing so.
*/
__conn_data_want_send(conn);
si->flags &= ~SI_FL_WAIT_DATA;
if (!tick_isset(ob->wex))
ob->wex = tick_add_ifset(now_ms, ob->wto);
}
if (likely(ob->flags & CF_WRITE_ACTIVITY)) {
/* update timeout if we have written something */
if ((ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
!channel_is_empty(ob))
ob->wex = tick_add_ifset(now_ms, ob->wto);
if (tick_isset(si->ib->rex) && !(si->flags & SI_FL_INDEP_STR)) {
/* Note: to prevent the client from expiring read timeouts
* during writes, we refresh it. We only do this if the
* interface is not configured for "independent streams",
* because for some applications it's better not to do this,
* for instance when continuously exchanging small amounts
* of data which can full the socket buffers long before a
* write timeout is detected.
*/
si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
}
}
/* in case of special condition (error, shutdown, end of write...), we
* have to notify the task.
*/
if (likely((ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR|CF_SHUTW)) ||
((ob->flags & CF_WAKE_WRITE) &&
((channel_is_empty(si->ob) && !ob->to_forward) ||
si->state != SI_ST_EST)))) {
out_wakeup:
if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
task_wakeup(si->owner, TASK_WOKEN_IO);
}
/* commit possible polling changes */
conn_cond_update_polling(conn);
}
/*
* This function performs a shutdown-write on a stream interface attached to
* a connection in a connected or init state (it does nothing for other
* states). It either shuts the write side or marks itself as closed. The
* buffer flags are updated to reflect the new state. It does also close
* everything if the SI was marked as being in error state. If there is a
* data-layer shutdown, it is called. If a control layer is defined, then it is
* supposed to be a socket layer and file descriptors are then shutdown or
* closed accordingly. The function automatically disables polling if needed.
* Note: at the moment, we continue to check conn->ctrl eventhough we *know* it
* is valid. This will help selecting the proper shutdown() and setsockopt()
* calls if/when we implement remote sockets later.
*/
static void stream_int_shutw_conn(struct stream_interface *si)
{
struct connection *conn = __objt_conn(si->end);
si->ob->flags &= ~CF_SHUTW_NOW;
if (si->ob->flags & CF_SHUTW)
return;
si->ob->flags |= CF_SHUTW;
si->ob->wex = TICK_ETERNITY;
si->flags &= ~SI_FL_WAIT_DATA;
switch (si->state) {
case SI_ST_EST:
/* we have to shut before closing, otherwise some short messages
* may never leave the system, especially when there are remaining
* unread data in the socket input buffer, or when nolinger is set.
* However, if SI_FL_NOLINGER is explicitly set, we know there is
* no risk so we close both sides immediately.
*/
if (si->flags & SI_FL_ERR) {
/* quick close, the socket is alredy shut anyway */
}
else if (si->flags & SI_FL_NOLINGER) {
/* unclean data-layer shutdown */
if (conn->xprt && conn->xprt->shutw)
conn->xprt->shutw(conn, 0);
}
else {
/* clean data-layer shutdown */
if (conn->xprt && conn->xprt->shutw)
conn->xprt->shutw(conn, 1);
/* If the stream interface is configured to disable half-open
* connections, we'll skip the shutdown(), but only if the
* read size is already closed. Otherwise we can't support
* closed write with pending read (eg: abortonclose while
* waiting for the server).
*/
if (!(si->flags & SI_FL_NOHALF) || !(si->ib->flags & (CF_SHUTR|CF_DONT_READ))) {
/* We shutdown transport layer */
if (conn_ctrl_ready(conn))
shutdown(conn->t.sock.fd, SHUT_WR);
if (!(si->ib->flags & (CF_SHUTR|CF_DONT_READ))) {
/* OK just a shutw, but we want the caller
* to disable polling on this FD if exists.
*/
if (conn->ctrl)
conn_data_stop_send(conn);
return;
}
}
}
/* fall through */
case SI_ST_CON:
/* we may have to close a pending connection, and mark the
* response buffer as shutr
*/
conn_full_close(conn);
/* fall through */
case SI_ST_CER:
case SI_ST_QUE:
case SI_ST_TAR:
si->state = SI_ST_DIS;
/* fall through */
default:
si->flags &= ~(SI_FL_WAIT_ROOM | SI_FL_NOLINGER);
si->ib->flags &= ~CF_SHUTR_NOW;
si->ib->flags |= CF_SHUTR;
si->ib->rex = TICK_ETERNITY;
si->exp = TICK_ETERNITY;
}
}
/* Updates the timers and flags of a stream interface attached to a connection,
* depending on the buffers' flags. It should only be called once after the
* buffer flags have settled down, and before they are cleared. It doesn't
* harm to call it as often as desired (it just slightly hurts performance).
* It is only meant to be called by upper layers after buffer flags have been
* manipulated by analysers.
*/
void stream_int_update_conn(struct stream_interface *si)
{
struct channel *ib = si->ib;
struct channel *ob = si->ob;
struct connection *conn = __objt_conn(si->end);
/* Check if we need to close the read side */
if (!(ib->flags & CF_SHUTR)) {
/* Read not closed, update FD status and timeout for reads */
if ((ib->flags & CF_DONT_READ) || channel_full(ib)) {
/* stop reading */
if (!(si->flags & SI_FL_WAIT_ROOM)) {
if (!(ib->flags & CF_DONT_READ)) /* full */
si->flags |= SI_FL_WAIT_ROOM;
conn_data_stop_recv(conn);
ib->rex = TICK_ETERNITY;
}
}
else {
/* (re)start reading and update timeout. Note: we don't recompute the timeout
* everytime we get here, otherwise it would risk never to expire. We only
* update it if is was not yet set. The stream socket handler will already
* have updated it if there has been a completed I/O.
*/
si->flags &= ~SI_FL_WAIT_ROOM;
conn_data_want_recv(conn);
if (!(ib->flags & (CF_READ_NOEXP|CF_DONT_READ)) && !tick_isset(ib->rex))
ib->rex = tick_add_ifset(now_ms, ib->rto);
}
}
/* Check if we need to close the write side */
if (!(ob->flags & CF_SHUTW)) {
/* Write not closed, update FD status and timeout for writes */
if (channel_is_empty(ob)) {
/* stop writing */
if (!(si->flags & SI_FL_WAIT_DATA)) {
if ((ob->flags & CF_SHUTW_NOW) == 0)
si->flags |= SI_FL_WAIT_DATA;
conn_data_stop_send(conn);
ob->wex = TICK_ETERNITY;
}
}
else {
/* (re)start writing and update timeout. Note: we don't recompute the timeout
* everytime we get here, otherwise it would risk never to expire. We only
* update it if is was not yet set. The stream socket handler will already
* have updated it if there has been a completed I/O.
*/
si->flags &= ~SI_FL_WAIT_DATA;
conn_data_want_send(conn);
if (!tick_isset(ob->wex)) {
ob->wex = tick_add_ifset(now_ms, ob->wto);
if (tick_isset(ib->rex) && !(si->flags & SI_FL_INDEP_STR)) {
/* Note: depending on the protocol, we don't know if we're waiting
* for incoming data or not. So in order to prevent the socket from
* expiring read timeouts during writes, we refresh the read timeout,
* except if it was already infinite or if we have explicitly setup
* independent streams.
*/
ib->rex = tick_add_ifset(now_ms, ib->rto);
}
}
}
}
}
