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Willy Tarreaucff64112008-11-03 06:26:53 +01001/*
2 * Functions managing stream_interface structures
3 *
Willy Tarreauf873d752012-05-11 17:47:17 +02004 * Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
Willy Tarreaucff64112008-11-03 06:26:53 +01005 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <errno.h>
14#include <fcntl.h>
15#include <stdio.h>
16#include <stdlib.h>
17
18#include <sys/socket.h>
19#include <sys/stat.h>
20#include <sys/types.h>
21
22#include <common/compat.h>
23#include <common/config.h>
24#include <common/debug.h>
25#include <common/standard.h>
26#include <common/ticks.h>
27#include <common/time.h>
28
Willy Tarreauc7e42382012-08-24 19:22:53 +020029#include <proto/channel.h>
Willy Tarreau8b117082012-08-06 15:06:49 +020030#include <proto/connection.h>
Willy Tarreaucff64112008-11-03 06:26:53 +010031#include <proto/fd.h>
Willy Tarreau96199b12012-08-24 00:46:52 +020032#include <proto/pipe.h>
Willy Tarreau269358d2009-09-20 20:14:49 +020033#include <proto/stream_interface.h>
Willy Tarreaucff64112008-11-03 06:26:53 +010034#include <proto/task.h>
35
Willy Tarreaufd31e532012-07-23 18:24:25 +020036#include <types/pipe.h>
37
Willy Tarreauf873d752012-05-11 17:47:17 +020038/* socket functions used when running a stream interface as a task */
39static void stream_int_update(struct stream_interface *si);
40static void stream_int_update_embedded(struct stream_interface *si);
Willy Tarreauf873d752012-05-11 17:47:17 +020041static void stream_int_chk_rcv(struct stream_interface *si);
42static void stream_int_chk_snd(struct stream_interface *si);
Willy Tarreauc5788912012-08-24 18:12:41 +020043static void stream_int_update_conn(struct stream_interface *si);
44static void stream_int_chk_rcv_conn(struct stream_interface *si);
45static void stream_int_chk_snd_conn(struct stream_interface *si);
Willy Tarreau4aa36832012-10-02 20:07:22 +020046static void si_conn_recv_cb(struct connection *conn);
47static void si_conn_send_cb(struct connection *conn);
Willy Tarreau2396c1c2012-10-03 21:12:16 +020048static int si_conn_wake_cb(struct connection *conn);
Willy Tarreauf873d752012-05-11 17:47:17 +020049
Willy Tarreauc5788912012-08-24 18:12:41 +020050/* stream-interface operations for embedded tasks */
51struct si_ops si_embedded_ops = {
Willy Tarreau5c979a92012-05-07 17:15:39 +020052 .update = stream_int_update_embedded,
Willy Tarreau5c979a92012-05-07 17:15:39 +020053 .chk_rcv = stream_int_chk_rcv,
54 .chk_snd = stream_int_chk_snd,
Willy Tarreau5c979a92012-05-07 17:15:39 +020055};
56
Willy Tarreauc5788912012-08-24 18:12:41 +020057/* stream-interface operations for external tasks */
58struct si_ops si_task_ops = {
Willy Tarreau5c979a92012-05-07 17:15:39 +020059 .update = stream_int_update,
Willy Tarreau5c979a92012-05-07 17:15:39 +020060 .chk_rcv = stream_int_chk_rcv,
61 .chk_snd = stream_int_chk_snd,
Willy Tarreau5c979a92012-05-07 17:15:39 +020062};
63
Willy Tarreauc5788912012-08-24 18:12:41 +020064/* stream-interface operations for connections */
65struct si_ops si_conn_ops = {
66 .update = stream_int_update_conn,
67 .chk_rcv = stream_int_chk_rcv_conn,
68 .chk_snd = stream_int_chk_snd_conn,
69};
70
Willy Tarreau74beec32012-10-03 00:41:04 +020071struct data_cb si_conn_cb = {
Willy Tarreauc5788912012-08-24 18:12:41 +020072 .recv = si_conn_recv_cb,
73 .send = si_conn_send_cb,
Willy Tarreau4aa36832012-10-02 20:07:22 +020074 .wake = si_conn_wake_cb,
Willy Tarreauc5788912012-08-24 18:12:41 +020075};
76
Willy Tarreaucff64112008-11-03 06:26:53 +010077/*
78 * This function only has to be called once after a wakeup event in case of
79 * suspected timeout. It controls the stream interface timeouts and sets
80 * si->flags accordingly. It does NOT close anything, as this timeout may
81 * be used for any purpose. It returns 1 if the timeout fired, otherwise
82 * zero.
83 */
84int stream_int_check_timeouts(struct stream_interface *si)
85{
86 if (tick_is_expired(si->exp, now_ms)) {
87 si->flags |= SI_FL_EXP;
88 return 1;
89 }
90 return 0;
91}
92
Willy Tarreaufe3718a2008-11-30 18:14:12 +010093/* to be called only when in SI_ST_DIS with SI_FL_ERR */
Willy Tarreaucff64112008-11-03 06:26:53 +010094void stream_int_report_error(struct stream_interface *si)
95{
96 if (!si->err_type)
97 si->err_type = SI_ET_DATA_ERR;
98
Willy Tarreau03cdb7c2012-08-27 23:14:58 +020099 si->ob->flags |= CF_WRITE_ERROR;
100 si->ib->flags |= CF_READ_ERROR;
Willy Tarreaucff64112008-11-03 06:26:53 +0100101}
102
103/*
Willy Tarreaudded32d2008-11-30 19:48:07 +0100104 * Returns a message to the client ; the connection is shut down for read,
105 * and the request is cleared so that no server connection can be initiated.
106 * The buffer is marked for read shutdown on the other side to protect the
107 * message, and the buffer write is enabled. The message is contained in a
Willy Tarreau148d0992010-01-10 10:21:21 +0100108 * "chunk". If it is null, then an empty message is used. The reply buffer does
109 * not need to be empty before this, and its contents will not be overwritten.
110 * The primary goal of this function is to return error messages to a client.
Willy Tarreaudded32d2008-11-30 19:48:07 +0100111 */
112void stream_int_retnclose(struct stream_interface *si, const struct chunk *msg)
113{
Willy Tarreau8263d2b2012-08-28 00:06:31 +0200114 channel_auto_read(si->ib);
115 channel_abort(si->ib);
116 channel_auto_close(si->ib);
117 channel_erase(si->ib);
Willy Tarreau798e1282010-12-12 13:06:00 +0100118
Willy Tarreau9dab5fc2012-05-07 11:56:55 +0200119 bi_erase(si->ob);
Willy Tarreau148d0992010-01-10 10:21:21 +0100120 if (likely(msg && msg->len))
Willy Tarreau9dab5fc2012-05-07 11:56:55 +0200121 bo_inject(si->ob, msg->str, msg->len);
Willy Tarreaudded32d2008-11-30 19:48:07 +0100122
123 si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);
Willy Tarreau8263d2b2012-08-28 00:06:31 +0200124 channel_auto_read(si->ob);
125 channel_auto_close(si->ob);
126 channel_shutr_now(si->ob);
Willy Tarreau5d881d02009-12-27 22:51:06 +0100127}
128
Willy Tarreaufb90d942009-09-05 20:57:35 +0200129/* default update function for scheduled tasks, not used for embedded tasks */
Willy Tarreauf873d752012-05-11 17:47:17 +0200130static void stream_int_update(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200131{
132 DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
133 __FUNCTION__,
134 si, si->state, si->ib->flags, si->ob->flags);
135
136 if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
137 task_wakeup(si->owner, TASK_WOKEN_IO);
138}
139
140/* default update function for embedded tasks, to be used at the end of the i/o handler */
Willy Tarreauf873d752012-05-11 17:47:17 +0200141static void stream_int_update_embedded(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200142{
Willy Tarreau3488e252010-08-09 16:24:56 +0200143 int old_flags = si->flags;
144
Willy Tarreaufb90d942009-09-05 20:57:35 +0200145 DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
146 __FUNCTION__,
147 si, si->state, si->ib->flags, si->ob->flags);
148
149 if (si->state != SI_ST_EST)
150 return;
151
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200152 if ((si->ob->flags & (CF_SHUTW|CF_HIJACK|CF_SHUTW_NOW)) == CF_SHUTW_NOW &&
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200153 channel_is_empty(si->ob))
Willy Tarreau73b013b2012-05-21 16:31:45 +0200154 si_shutw(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200155
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200156 if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW|CF_HIJACK)) == 0 && !channel_full(si->ob))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200157 si->flags |= SI_FL_WAIT_DATA;
158
Willy Tarreau96fd4b52009-10-04 17:18:35 +0200159 /* we're almost sure that we need some space if the buffer is not
160 * empty, even if it's not full, because the applets can't fill it.
161 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200162 if ((si->ib->flags & (CF_SHUTR|CF_DONT_READ)) == 0 && !channel_is_empty(si->ib))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200163 si->flags |= SI_FL_WAIT_ROOM;
164
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200165 if (si->ob->flags & CF_WRITE_ACTIVITY) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200166 if (tick_isset(si->ob->wex))
167 si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);
168 }
169
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200170 if (si->ib->flags & CF_READ_ACTIVITY ||
171 (si->ob->flags & CF_WRITE_ACTIVITY && !(si->flags & SI_FL_INDEP_STR))) {
Willy Tarreauf27b5ea2009-10-03 22:01:18 +0200172 if (tick_isset(si->ib->rex))
173 si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
174 }
175
Willy Tarreau3488e252010-08-09 16:24:56 +0200176 /* save flags to detect changes */
177 old_flags = si->flags;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200178 if (likely((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200179 !channel_full(si->ob) &&
Willy Tarreau96fd4b52009-10-04 17:18:35 +0200180 (si->ob->prod->flags & SI_FL_WAIT_ROOM)))
Willy Tarreau73b013b2012-05-21 16:31:45 +0200181 si_chk_rcv(si->ob->prod);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200182
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200183 if (((si->ib->flags & CF_READ_PARTIAL) && !channel_is_empty(si->ib)) &&
Willy Tarreau3488e252010-08-09 16:24:56 +0200184 (si->ib->cons->flags & SI_FL_WAIT_DATA)) {
Willy Tarreau73b013b2012-05-21 16:31:45 +0200185 si_chk_snd(si->ib->cons);
Willy Tarreau3488e252010-08-09 16:24:56 +0200186 /* check if the consumer has freed some space */
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200187 if (!channel_full(si->ib))
Willy Tarreau3488e252010-08-09 16:24:56 +0200188 si->flags &= ~SI_FL_WAIT_ROOM;
189 }
Willy Tarreaufb90d942009-09-05 20:57:35 +0200190
191 /* Note that we're trying to wake up in two conditions here :
192 * - special event, which needs the holder task attention
193 * - status indicating that the applet can go on working. This
194 * is rather hard because we might be blocking on output and
195 * don't want to wake up on input and vice-versa. The idea is
Willy Tarreau3488e252010-08-09 16:24:56 +0200196 * to only rely on the changes the chk_* might have performed.
Willy Tarreaufb90d942009-09-05 20:57:35 +0200197 */
198 if (/* check stream interface changes */
Willy Tarreau3488e252010-08-09 16:24:56 +0200199 ((old_flags & ~si->flags) & (SI_FL_WAIT_ROOM|SI_FL_WAIT_DATA)) ||
200
201 /* changes on the production side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200202 (si->ib->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
Willy Tarreau3488e252010-08-09 16:24:56 +0200203 si->state != SI_ST_EST ||
204 (si->flags & SI_FL_ERR) ||
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200205 ((si->ib->flags & CF_READ_PARTIAL) &&
Willy Tarreau3488e252010-08-09 16:24:56 +0200206 (!si->ib->to_forward || si->ib->cons->state != SI_ST_EST)) ||
207
208 /* changes on the consumption side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200209 (si->ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
210 ((si->ob->flags & CF_WRITE_ACTIVITY) &&
211 ((si->ob->flags & CF_SHUTW) ||
Willy Tarreau3488e252010-08-09 16:24:56 +0200212 si->ob->prod->state != SI_ST_EST ||
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200213 (channel_is_empty(si->ob) && !si->ob->to_forward)))) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200214 if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
215 task_wakeup(si->owner, TASK_WOKEN_IO);
216 }
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200217 if (si->ib->flags & CF_READ_ACTIVITY)
218 si->ib->flags &= ~CF_READ_DONTWAIT;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200219}
220
Willy Tarreau4a36b562012-08-06 19:31:45 +0200221/*
222 * This function performs a shutdown-read on a stream interface in a connected
223 * or init state (it does nothing for other states). It either shuts the read
224 * side or marks itself as closed. The buffer flags are updated to reflect the
225 * new state. If the stream interface has SI_FL_NOHALF, we also forward the
226 * close to the write side. If a control layer is defined, then it is supposed
227 * to be a socket layer and file descriptors are then shutdown or closed
228 * accordingly. If no control layer is defined, then the SI is supposed to be
229 * an embedded one and the owner task is woken up if it exists. The function
230 * does not disable polling on the FD by itself, it returns non-zero instead
231 * if the caller needs to do so (except when the FD is deleted where this is
232 * implicit).
233 */
234int stream_int_shutr(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200235{
Willy Tarreau4a36b562012-08-06 19:31:45 +0200236 struct connection *conn = &si->conn;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200237
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200238 si->ib->flags &= ~CF_SHUTR_NOW;
239 if (si->ib->flags & CF_SHUTR)
Willy Tarreau4a36b562012-08-06 19:31:45 +0200240 return 0;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200241 si->ib->flags |= CF_SHUTR;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200242 si->ib->rex = TICK_ETERNITY;
243 si->flags &= ~SI_FL_WAIT_ROOM;
244
245 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
Willy Tarreau4a36b562012-08-06 19:31:45 +0200246 return 0;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200247
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200248 if (si->ob->flags & CF_SHUTW) {
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200249 conn_xprt_close(&si->conn);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200250 if (conn->ctrl)
251 fd_delete(si_fd(si));
Willy Tarreaufb90d942009-09-05 20:57:35 +0200252 si->state = SI_ST_DIS;
253 si->exp = TICK_ETERNITY;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200254
Willy Tarreaud8ccffe2010-09-07 16:16:50 +0200255 if (si->release)
256 si->release(si);
257 }
Willy Tarreau4a36b562012-08-06 19:31:45 +0200258 else if (si->flags & SI_FL_NOHALF) {
259 /* we want to immediately forward this close to the write side */
260 return stream_int_shutw(si);
261 }
262 else if (conn->ctrl) {
263 /* we want the caller to disable polling on this FD */
264 return 1;
265 }
Willy Tarreau0bd05ea2010-07-02 11:18:03 +0200266
Willy Tarreau4a36b562012-08-06 19:31:45 +0200267 /* note that if the task exists, it must unregister itself once it runs */
268 if (!conn->ctrl && !(si->flags & SI_FL_DONT_WAKE) && si->owner)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200269 task_wakeup(si->owner, TASK_WOKEN_IO);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200270 return 0;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200271}
272
Willy Tarreau4a36b562012-08-06 19:31:45 +0200273/*
274 * This function performs a shutdown-write on a stream interface in a connected or
275 * init state (it does nothing for other states). It either shuts the write side
276 * or marks itself as closed. The buffer flags are updated to reflect the new state.
277 * It does also close everything if the SI was marked as being in error state. If
278 * there is a data-layer shutdown, it is called. If a control layer is defined, then
279 * it is supposed to be a socket layer and file descriptors are then shutdown or
280 * closed accordingly. If no control layer is defined, then the SI is supposed to
281 * be an embedded one and the owner task is woken up if it exists. The function
282 * does not disable polling on the FD by itself, it returns non-zero instead if
283 * the caller needs to do so (except when the FD is deleted where this is implicit).
284 */
285int stream_int_shutw(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200286{
Willy Tarreau4a36b562012-08-06 19:31:45 +0200287 struct connection *conn = &si->conn;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200288
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200289 si->ob->flags &= ~CF_SHUTW_NOW;
290 if (si->ob->flags & CF_SHUTW)
Willy Tarreau4a36b562012-08-06 19:31:45 +0200291 return 0;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200292 si->ob->flags |= CF_SHUTW;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200293 si->ob->wex = TICK_ETERNITY;
294 si->flags &= ~SI_FL_WAIT_DATA;
295
296 switch (si->state) {
297 case SI_ST_EST:
Willy Tarreau4a36b562012-08-06 19:31:45 +0200298 /* we have to shut before closing, otherwise some short messages
299 * may never leave the system, especially when there are remaining
300 * unread data in the socket input buffer, or when nolinger is set.
301 * However, if SI_FL_NOLINGER is explicitly set, we know there is
302 * no risk so we close both sides immediately.
303 */
304 if (si->flags & SI_FL_ERR) {
305 /* quick close, the socket is already shut. Remove pending flags. */
306 si->flags &= ~SI_FL_NOLINGER;
307 } else if (si->flags & SI_FL_NOLINGER) {
308 si->flags &= ~SI_FL_NOLINGER;
309 if (conn->ctrl) {
310 setsockopt(si_fd(si), SOL_SOCKET, SO_LINGER,
311 (struct linger *) &nolinger, sizeof(struct linger));
312 }
313 /* unclean data-layer shutdown */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200314 if (conn->xprt && conn->xprt->shutw)
315 conn->xprt->shutw(conn, 0);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200316 } else {
317 /* clean data-layer shutdown */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200318 if (conn->xprt && conn->xprt->shutw)
319 conn->xprt->shutw(conn, 1);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200320
321 if (!(si->flags & SI_FL_NOHALF)) {
322 /* We shutdown transport layer */
323 if (conn->ctrl)
324 shutdown(si_fd(si), SHUT_WR);
325
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200326 if (!(si->ib->flags & (CF_SHUTR|CF_DONT_READ))) {
Willy Tarreau4a36b562012-08-06 19:31:45 +0200327 /* OK just a shutw, but we want the caller
328 * to disable polling on this FD if exists.
329 */
330 return !!conn->ctrl;
331 }
332 }
333 }
Willy Tarreaufb90d942009-09-05 20:57:35 +0200334
335 /* fall through */
336 case SI_ST_CON:
Willy Tarreau4a36b562012-08-06 19:31:45 +0200337 /* we may have to close a pending connection, and mark the
338 * response buffer as shutr
339 */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200340 conn_xprt_close(&si->conn);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200341 if (conn->ctrl)
342 fd_delete(si_fd(si));
343 /* fall through */
Willy Tarreaufb90d942009-09-05 20:57:35 +0200344 case SI_ST_CER:
Willy Tarreau32d3ee92010-12-29 14:03:02 +0100345 case SI_ST_QUE:
346 case SI_ST_TAR:
Willy Tarreaufb90d942009-09-05 20:57:35 +0200347 si->state = SI_ST_DIS;
Willy Tarreaud8ccffe2010-09-07 16:16:50 +0200348
349 if (si->release)
350 si->release(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200351 default:
352 si->flags &= ~SI_FL_WAIT_ROOM;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200353 si->ib->flags |= CF_SHUTR;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200354 si->ib->rex = TICK_ETERNITY;
355 si->exp = TICK_ETERNITY;
356 }
357
Willy Tarreau4a36b562012-08-06 19:31:45 +0200358 /* note that if the task exists, it must unregister itself once it runs */
359 if (!conn->ctrl && !(si->flags & SI_FL_DONT_WAKE) && si->owner)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200360 task_wakeup(si->owner, TASK_WOKEN_IO);
Willy Tarreau4a36b562012-08-06 19:31:45 +0200361 return 0;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200362}
363
364/* default chk_rcv function for scheduled tasks */
Willy Tarreauf873d752012-05-11 17:47:17 +0200365static void stream_int_chk_rcv(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200366{
Willy Tarreau7421efb2012-07-02 15:11:27 +0200367 struct channel *ib = si->ib;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200368
369 DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
370 __FUNCTION__,
371 si, si->state, si->ib->flags, si->ob->flags);
372
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200373 if (unlikely(si->state != SI_ST_EST || (ib->flags & (CF_SHUTR|CF_HIJACK|CF_DONT_READ))))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200374 return;
375
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200376 if (channel_full(ib)) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200377 /* stop reading */
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200378 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200379 }
380 else {
381 /* (re)start reading */
382 si->flags &= ~SI_FL_WAIT_ROOM;
383 if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
384 task_wakeup(si->owner, TASK_WOKEN_IO);
385 }
386}
387
388/* default chk_snd function for scheduled tasks */
Willy Tarreauf873d752012-05-11 17:47:17 +0200389static void stream_int_chk_snd(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200390{
Willy Tarreau7421efb2012-07-02 15:11:27 +0200391 struct channel *ob = si->ob;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200392
393 DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
394 __FUNCTION__,
395 si, si->state, si->ib->flags, si->ob->flags);
396
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200397 if (unlikely(si->state != SI_ST_EST || (si->ob->flags & CF_SHUTW)))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200398 return;
399
400 if (!(si->flags & SI_FL_WAIT_DATA) || /* not waiting for data */
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200401 channel_is_empty(ob)) /* called with nothing to send ! */
Willy Tarreaufb90d942009-09-05 20:57:35 +0200402 return;
403
404 /* Otherwise there are remaining data to be sent in the buffer,
405 * so we tell the handler.
406 */
407 si->flags &= ~SI_FL_WAIT_DATA;
408 if (!tick_isset(ob->wex))
409 ob->wex = tick_add_ifset(now_ms, ob->wto);
410
411 if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
412 task_wakeup(si->owner, TASK_WOKEN_IO);
413}
414
Willy Tarreaub24281b2011-02-13 13:16:36 +0100415/* Register an applet to handle a stream_interface as part of the stream
Willy Tarreaufb90d942009-09-05 20:57:35 +0200416 * interface's owner task, which is returned. The SI will wake it up everytime
Willy Tarreaub24281b2011-02-13 13:16:36 +0100417 * it is solicited. The task's processing function must call the applet's
Willy Tarreaufb90d942009-09-05 20:57:35 +0200418 * function before returning. It must be deleted by the task handler using
Willy Tarreaub24281b2011-02-13 13:16:36 +0100419 * stream_int_unregister_handler(), possibly from within the function itself.
Willy Tarreaufa6bac62012-05-31 14:16:59 +0200420 * It also pre-initializes applet.state to zero and the connection context
421 * to NULL.
Willy Tarreaufb90d942009-09-05 20:57:35 +0200422 */
Willy Tarreaub24281b2011-02-13 13:16:36 +0100423struct task *stream_int_register_handler(struct stream_interface *si, struct si_applet *app)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200424{
Simon Horman7abd00d2011-08-13 08:03:51 +0900425 DPRINTF(stderr, "registering handler %p for si %p (was %p)\n", app, si, si->owner);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200426
Willy Tarreauc5788912012-08-24 18:12:41 +0200427 si_prepare_embedded(si);
Willy Tarreau3cefd522012-08-30 15:49:18 +0200428 set_target_applet(&si->conn.target, app);
Aman Gupta9a13e842012-04-02 18:57:53 -0700429 si->release = app->release;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200430 si->flags |= SI_FL_WAIT_DATA;
431 return si->owner;
432}
433
434/* Register a function to handle a stream_interface as a standalone task. The
435 * new task itself is returned and is assigned as si->owner. The stream_interface
436 * pointer will be pointed to by the task's context. The handler can be detached
437 * by using stream_int_unregister_handler().
Willy Tarreau7c0a1512011-03-10 11:17:02 +0100438 * FIXME: the code should be updated to ensure that we don't change si->owner
439 * anymore as this is not needed. However, process_session still relies on it.
Willy Tarreaufb90d942009-09-05 20:57:35 +0200440 */
441struct task *stream_int_register_handler_task(struct stream_interface *si,
442 struct task *(*fct)(struct task *))
443{
444 struct task *t;
445
446 DPRINTF(stderr, "registering handler %p for si %p (was %p)\n", fct, si, si->owner);
447
Willy Tarreauc5788912012-08-24 18:12:41 +0200448 si_prepare_task(si);
Willy Tarreau3cefd522012-08-30 15:49:18 +0200449 clear_target(&si->conn.target);
Willy Tarreau0bd05ea2010-07-02 11:18:03 +0200450 si->release = NULL;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200451 si->flags |= SI_FL_WAIT_DATA;
452
453 t = task_new();
454 si->owner = t;
455 if (!t)
456 return t;
Willy Tarreau7c0a1512011-03-10 11:17:02 +0100457
Willy Tarreau3cefd522012-08-30 15:49:18 +0200458 set_target_task(&si->conn.target, t);
Willy Tarreau7c0a1512011-03-10 11:17:02 +0100459
Willy Tarreaufb90d942009-09-05 20:57:35 +0200460 t->process = fct;
461 t->context = si;
462 task_wakeup(si->owner, TASK_WOKEN_INIT);
463
464 return t;
465}
466
467/* Unregister a stream interface handler. This must be called by the handler task
468 * itself when it detects that it is in the SI_ST_DIS state. This function can
469 * both detach standalone handlers and embedded handlers.
470 */
471void stream_int_unregister_handler(struct stream_interface *si)
472{
Willy Tarreau3cefd522012-08-30 15:49:18 +0200473 if (si->conn.target.type == TARG_TYPE_TASK) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200474 /* external handler : kill the task */
Willy Tarreau3cefd522012-08-30 15:49:18 +0200475 task_delete(si->conn.target.ptr.t);
476 task_free(si->conn.target.ptr.t);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200477 }
Willy Tarreau0bd05ea2010-07-02 11:18:03 +0200478 si->release = NULL;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200479 si->owner = NULL;
Willy Tarreau3cefd522012-08-30 15:49:18 +0200480 clear_target(&si->conn.target);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200481}
482
Willy Tarreau2c6be842012-07-06 17:12:34 +0200483/* This callback is used to send a valid PROXY protocol line to a socket being
Willy Tarreauafad0e02012-08-09 14:45:22 +0200484 * established. It returns 0 if it fails in a fatal way or needs to poll to go
485 * further, otherwise it returns non-zero and removes itself from the connection's
Willy Tarreaua1a74742012-08-24 12:14:49 +0200486 * flags (the bit is provided in <flag> by the caller). It is designed to be
487 * called by the connection handler and relies on it to commit polling changes.
Willy Tarreau2c6be842012-07-06 17:12:34 +0200488 */
489int conn_si_send_proxy(struct connection *conn, unsigned int flag)
490{
Willy Tarreaue603e692012-09-27 22:20:41 +0200491 struct stream_interface *si = conn->owner;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200492
493 /* we might have been called just after an asynchronous shutw */
Willy Tarreaua1a74742012-08-24 12:14:49 +0200494 if (conn->flags & CO_FL_SOCK_WR_SH)
Willy Tarreau2c6be842012-07-06 17:12:34 +0200495 goto out_error;
496
497 /* If we have a PROXY line to send, we'll use this to validate the
498 * connection, in which case the connection is validated only once
499 * we've sent the whole proxy line. Otherwise we use connect().
500 */
501 if (si->send_proxy_ofs) {
502 int ret;
503
504 /* The target server expects a PROXY line to be sent first.
505 * If the send_proxy_ofs is negative, it corresponds to the
506 * offset to start sending from then end of the proxy string
507 * (which is recomputed every time since it's constant). If
508 * it is positive, it means we have to send from the start.
509 */
Willy Tarreau986a9d22012-08-30 21:11:38 +0200510 ret = make_proxy_line(trash, trashlen, &si->ob->prod->conn.addr.from, &si->ob->prod->conn.addr.to);
Willy Tarreau2c6be842012-07-06 17:12:34 +0200511 if (!ret)
512 goto out_error;
513
514 if (si->send_proxy_ofs > 0)
515 si->send_proxy_ofs = -ret; /* first call */
516
Willy Tarreaua1a74742012-08-24 12:14:49 +0200517 /* we have to send trash from (ret+sp for -sp bytes). If the
518 * data layer has a pending write, we'll also set MSG_MORE.
519 */
520 ret = send(conn->t.sock.fd, trash + ret + si->send_proxy_ofs, -si->send_proxy_ofs,
521 (conn->flags & CO_FL_DATA_WR_ENA) ? MSG_MORE : 0);
Willy Tarreau2c6be842012-07-06 17:12:34 +0200522
523 if (ret == 0)
524 goto out_wait;
525
526 if (ret < 0) {
527 if (errno == EAGAIN)
528 goto out_wait;
529 goto out_error;
530 }
531
532 si->send_proxy_ofs += ret; /* becomes zero once complete */
533 if (si->send_proxy_ofs != 0)
534 goto out_wait;
535
536 /* OK we've sent the whole line, we're connected */
537 }
538
Willy Tarreaua1a74742012-08-24 12:14:49 +0200539 /* The connection is ready now, simply return and let the connection
540 * handler notify upper layers if needed.
Willy Tarreau2c6be842012-07-06 17:12:34 +0200541 */
542 if (conn->flags & CO_FL_WAIT_L4_CONN)
543 conn->flags &= ~CO_FL_WAIT_L4_CONN;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200544 conn->flags &= ~flag;
Willy Tarreauafad0e02012-08-09 14:45:22 +0200545 return 1;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200546
547 out_error:
Willy Tarreauafad0e02012-08-09 14:45:22 +0200548 /* Write error on the file descriptor */
Willy Tarreau2c6be842012-07-06 17:12:34 +0200549 conn->flags |= CO_FL_ERROR;
Willy Tarreauafad0e02012-08-09 14:45:22 +0200550 conn->flags &= ~flag;
Willy Tarreauafad0e02012-08-09 14:45:22 +0200551 return 0;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200552
553 out_wait:
Willy Tarreaua1a74742012-08-24 12:14:49 +0200554 __conn_sock_stop_recv(conn);
555 __conn_sock_poll_send(conn);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200556 return 0;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200557}
558
Willy Tarreau100c4672012-08-20 12:06:26 +0200559/* Callback to be used by connection I/O handlers upon completion. It differs from
Willy Tarreau4aa36832012-10-02 20:07:22 +0200560 * the update function in that it is designed to be called by lower layers after I/O
Willy Tarreau100c4672012-08-20 12:06:26 +0200561 * events have been completed. It will also try to wake the associated task up if
Willy Tarreauf16723e2012-08-24 12:52:22 +0200562 * an important event requires special handling. It relies on the connection handler
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200563 * to commit any polling updates. The function always returns 0.
Willy Tarreau100c4672012-08-20 12:06:26 +0200564 */
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200565static int si_conn_wake_cb(struct connection *conn)
Willy Tarreaufd31e532012-07-23 18:24:25 +0200566{
Willy Tarreaue603e692012-09-27 22:20:41 +0200567 struct stream_interface *si = conn->owner;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200568
569 DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
570 __FUNCTION__,
571 si, si->state, si->ib->flags, si->ob->flags);
572
Willy Tarreau3c55ec22012-07-23 19:19:51 +0200573 if (conn->flags & CO_FL_ERROR)
574 si->flags |= SI_FL_ERR;
575
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200576 /* check for recent connection establishment */
Willy Tarreauc76ae332012-07-12 15:32:13 +0200577 if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) {
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200578 si->exp = TICK_ETERNITY;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200579 si->ob->flags |= CF_WRITE_NULL;
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200580 }
581
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200582 /* process consumer side */
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200583 if (channel_is_empty(si->ob)) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200584 if (((si->ob->flags & (CF_SHUTW|CF_HIJACK|CF_SHUTW_NOW)) == CF_SHUTW_NOW) &&
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200585 (si->state == SI_ST_EST))
586 stream_int_shutw(si);
Willy Tarreauf16723e2012-08-24 12:52:22 +0200587 __conn_data_stop_send(conn);
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200588 si->ob->wex = TICK_ETERNITY;
589 }
Willy Tarreaufd31e532012-07-23 18:24:25 +0200590
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200591 if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW|CF_HIJACK)) == 0 && !channel_full(si->ob))
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200592 si->flags |= SI_FL_WAIT_DATA;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200593
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200594 if (si->ob->flags & CF_WRITE_ACTIVITY) {
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200595 /* update timeouts if we have written something */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200596 if ((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200597 !channel_is_empty(si->ob))
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200598 if (tick_isset(si->ob->wex))
599 si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200600
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200601 if (!(si->flags & SI_FL_INDEP_STR))
602 if (tick_isset(si->ib->rex))
603 si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200604
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200605 if (likely((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200606 !channel_full(si->ob) &&
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200607 (si->ob->prod->flags & SI_FL_WAIT_ROOM)))
608 si_chk_rcv(si->ob->prod);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200609 }
610
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200611 /* process producer side.
612 * We might have some data the consumer is waiting for.
613 * We can do fast-forwarding, but we avoid doing this for partial
614 * buffers, because it is very likely that it will be done again
615 * immediately afterwards once the following data is parsed (eg:
616 * HTTP chunking).
617 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200618 if (((si->ib->flags & CF_READ_PARTIAL) && !channel_is_empty(si->ib)) &&
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200619 (si->ib->pipe /* always try to send spliced data */ ||
620 (si->ib->buf.i == 0 && (si->ib->cons->flags & SI_FL_WAIT_DATA)))) {
621 int last_len = si->ib->pipe ? si->ib->pipe->data : 0;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200622
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200623 si_chk_snd(si->ib->cons);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200624
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200625 /* check if the consumer has freed some space either in the
626 * buffer or in the pipe.
627 */
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200628 if (!channel_full(si->ib) &&
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200629 (!last_len || !si->ib->pipe || si->ib->pipe->data < last_len))
630 si->flags &= ~SI_FL_WAIT_ROOM;
631 }
Willy Tarreaufd31e532012-07-23 18:24:25 +0200632
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200633 if (si->flags & SI_FL_WAIT_ROOM) {
Willy Tarreauf16723e2012-08-24 12:52:22 +0200634 __conn_data_stop_recv(conn);
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200635 si->ib->rex = TICK_ETERNITY;
636 }
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200637 else if ((si->ib->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ|CF_READ_NOEXP)) == CF_READ_PARTIAL &&
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200638 !channel_full(si->ib)) {
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200639 if (tick_isset(si->ib->rex))
640 si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200641 }
642
643 /* wake the task up only when needed */
644 if (/* changes on the production side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200645 (si->ib->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
Willy Tarreaufd31e532012-07-23 18:24:25 +0200646 si->state != SI_ST_EST ||
647 (si->flags & SI_FL_ERR) ||
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200648 ((si->ib->flags & CF_READ_PARTIAL) &&
Willy Tarreaufd31e532012-07-23 18:24:25 +0200649 (!si->ib->to_forward || si->ib->cons->state != SI_ST_EST)) ||
650
651 /* changes on the consumption side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200652 (si->ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
653 ((si->ob->flags & CF_WRITE_ACTIVITY) &&
654 ((si->ob->flags & CF_SHUTW) ||
Willy Tarreaufd31e532012-07-23 18:24:25 +0200655 si->ob->prod->state != SI_ST_EST ||
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200656 (channel_is_empty(si->ob) && !si->ob->to_forward)))) {
Willy Tarreaufd31e532012-07-23 18:24:25 +0200657 task_wakeup(si->owner, TASK_WOKEN_IO);
658 }
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200659 if (si->ib->flags & CF_READ_ACTIVITY)
660 si->ib->flags &= ~CF_READ_DONTWAIT;
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200661 return 0;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200662}
Willy Tarreau2c6be842012-07-06 17:12:34 +0200663
Willy Tarreau5368d802012-08-21 18:22:06 +0200664/*
665 * This function is called to send buffer data to a stream socket.
666 * It returns -1 in case of unrecoverable error, otherwise zero.
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200667 * It iterates the transport layer's snd_buf function. It relies on the
Willy Tarreauf16723e2012-08-24 12:52:22 +0200668 * caller to commit polling changes.
Willy Tarreau5368d802012-08-21 18:22:06 +0200669 */
670static int si_conn_send_loop(struct connection *conn)
671{
Willy Tarreaue603e692012-09-27 22:20:41 +0200672 struct stream_interface *si = conn->owner;
Willy Tarreau5368d802012-08-21 18:22:06 +0200673 struct channel *b = si->ob;
674 int write_poll = MAX_WRITE_POLL_LOOPS;
675 int ret;
676
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200677 if (b->pipe && conn->xprt->snd_pipe) {
678 ret = conn->xprt->snd_pipe(conn, b->pipe);
Willy Tarreau96199b12012-08-24 00:46:52 +0200679 if (ret > 0)
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200680 b->flags |= CF_WRITE_PARTIAL;
Willy Tarreau5368d802012-08-21 18:22:06 +0200681
682 if (!b->pipe->data) {
683 put_pipe(b->pipe);
684 b->pipe = NULL;
Willy Tarreau5368d802012-08-21 18:22:06 +0200685 }
686
Willy Tarreau96199b12012-08-24 00:46:52 +0200687 if (conn->flags & CO_FL_ERROR)
688 return -1;
Willy Tarreau5368d802012-08-21 18:22:06 +0200689 }
690
691 /* At this point, the pipe is empty, but we may still have data pending
692 * in the normal buffer.
693 */
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200694 if (!b->buf.o)
Willy Tarreau5368d802012-08-21 18:22:06 +0200695 return 0;
Willy Tarreau5368d802012-08-21 18:22:06 +0200696
697 /* when we're in this loop, we already know that there is no spliced
698 * data left, and that there are sendable buffered data.
699 */
Willy Tarreau56a77e52012-09-02 18:34:44 +0200700 while (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_DATA_WR_SH | CO_FL_WAIT_DATA | CO_FL_WAIT_WR | CO_FL_HANDSHAKE))) {
Willy Tarreau5368d802012-08-21 18:22:06 +0200701 /* check if we want to inform the kernel that we're interested in
702 * sending more data after this call. We want this if :
703 * - we're about to close after this last send and want to merge
704 * the ongoing FIN with the last segment.
705 * - we know we can't send everything at once and must get back
706 * here because of unaligned data
707 * - there is still a finite amount of data to forward
708 * The test is arranged so that the most common case does only 2
709 * tests.
710 */
711 unsigned int send_flag = MSG_DONTWAIT | MSG_NOSIGNAL;
712
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200713 if ((!(b->flags & (CF_NEVER_WAIT|CF_SEND_DONTWAIT)) &&
714 ((b->to_forward && b->to_forward != CHN_INFINITE_FORWARD) ||
715 (b->flags & CF_EXPECT_MORE))) ||
716 ((b->flags & (CF_SHUTW|CF_SHUTW_NOW|CF_HIJACK)) == CF_SHUTW_NOW))
Willy Tarreau5368d802012-08-21 18:22:06 +0200717 send_flag |= MSG_MORE;
718
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200719 ret = conn->xprt->snd_buf(conn, &b->buf, send_flag);
Willy Tarreau5368d802012-08-21 18:22:06 +0200720 if (ret <= 0)
721 break;
722
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200723 b->flags |= CF_WRITE_PARTIAL;
Willy Tarreau5368d802012-08-21 18:22:06 +0200724
Willy Tarreau5368d802012-08-21 18:22:06 +0200725 if (!b->buf.o) {
726 /* Always clear both flags once everything has been sent, they're one-shot */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200727 b->flags &= ~(CF_EXPECT_MORE | CF_SEND_DONTWAIT);
Willy Tarreau5368d802012-08-21 18:22:06 +0200728 break;
729 }
730
731 if (--write_poll <= 0)
732 break;
733 } /* while */
734
735 if (conn->flags & CO_FL_ERROR)
736 return -1;
737
Willy Tarreau5368d802012-08-21 18:22:06 +0200738 return 0;
739}
740
741
Willy Tarreau100c4672012-08-20 12:06:26 +0200742/* Updates the timers and flags of a stream interface attached to a connection,
743 * depending on the buffers' flags. It should only be called once after the
744 * buffer flags have settled down, and before they are cleared. It doesn't
745 * harm to call it as often as desired (it just slightly hurts performance).
746 * It is only meant to be called by upper layers after buffer flags have been
747 * manipulated by analysers.
748 */
749void stream_int_update_conn(struct stream_interface *si)
750{
Willy Tarreau7421efb2012-07-02 15:11:27 +0200751 struct channel *ib = si->ib;
752 struct channel *ob = si->ob;
Willy Tarreau100c4672012-08-20 12:06:26 +0200753
Willy Tarreau100c4672012-08-20 12:06:26 +0200754 /* Check if we need to close the read side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200755 if (!(ib->flags & CF_SHUTR)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200756 /* Read not closed, update FD status and timeout for reads */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200757 if ((ib->flags & (CF_HIJACK|CF_DONT_READ)) || channel_full(ib)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200758 /* stop reading */
759 if (!(si->flags & SI_FL_WAIT_ROOM)) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200760 if (!(ib->flags & (CF_HIJACK|CF_DONT_READ))) /* full */
Willy Tarreau100c4672012-08-20 12:06:26 +0200761 si->flags |= SI_FL_WAIT_ROOM;
762 conn_data_stop_recv(&si->conn);
763 ib->rex = TICK_ETERNITY;
764 }
765 }
766 else {
767 /* (re)start reading and update timeout. Note: we don't recompute the timeout
768 * everytime we get here, otherwise it would risk never to expire. We only
769 * update it if is was not yet set. The stream socket handler will already
770 * have updated it if there has been a completed I/O.
771 */
772 si->flags &= ~SI_FL_WAIT_ROOM;
773 conn_data_want_recv(&si->conn);
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200774 if (!(ib->flags & (CF_READ_NOEXP|CF_DONT_READ)) && !tick_isset(ib->rex))
Willy Tarreau100c4672012-08-20 12:06:26 +0200775 ib->rex = tick_add_ifset(now_ms, ib->rto);
776 }
777 }
778
779 /* Check if we need to close the write side */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200780 if (!(ob->flags & CF_SHUTW)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200781 /* Write not closed, update FD status and timeout for writes */
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200782 if (channel_is_empty(ob)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200783 /* stop writing */
784 if (!(si->flags & SI_FL_WAIT_DATA)) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200785 if ((ob->flags & (CF_HIJACK|CF_SHUTW_NOW)) == 0)
Willy Tarreau100c4672012-08-20 12:06:26 +0200786 si->flags |= SI_FL_WAIT_DATA;
787 conn_data_stop_send(&si->conn);
788 ob->wex = TICK_ETERNITY;
789 }
790 }
791 else {
792 /* (re)start writing and update timeout. Note: we don't recompute the timeout
793 * everytime we get here, otherwise it would risk never to expire. We only
794 * update it if is was not yet set. The stream socket handler will already
795 * have updated it if there has been a completed I/O.
796 */
797 si->flags &= ~SI_FL_WAIT_DATA;
798 conn_data_want_send(&si->conn);
799 if (!tick_isset(ob->wex)) {
800 ob->wex = tick_add_ifset(now_ms, ob->wto);
801 if (tick_isset(ib->rex) && !(si->flags & SI_FL_INDEP_STR)) {
802 /* Note: depending on the protocol, we don't know if we're waiting
803 * for incoming data or not. So in order to prevent the socket from
804 * expiring read timeouts during writes, we refresh the read timeout,
805 * except if it was already infinite or if we have explicitly setup
806 * independent streams.
807 */
808 ib->rex = tick_add_ifset(now_ms, ib->rto);
809 }
810 }
811 }
812 }
813}
814
Willy Tarreau46a8d922012-08-20 12:38:36 +0200815/* This function is used for inter-stream-interface calls. It is called by the
816 * consumer to inform the producer side that it may be interested in checking
817 * for free space in the buffer. Note that it intentionally does not update
818 * timeouts, so that we can still check them later at wake-up. This function is
819 * dedicated to connection-based stream interfaces.
820 */
Willy Tarreauc5788912012-08-24 18:12:41 +0200821static void stream_int_chk_rcv_conn(struct stream_interface *si)
Willy Tarreau46a8d922012-08-20 12:38:36 +0200822{
Willy Tarreau7421efb2012-07-02 15:11:27 +0200823 struct channel *ib = si->ib;
Willy Tarreau46a8d922012-08-20 12:38:36 +0200824
Willy Tarreau34ffd772012-09-03 16:51:27 +0200825 if (unlikely(si->state > SI_ST_EST || (ib->flags & CF_SHUTR)))
Willy Tarreau46a8d922012-08-20 12:38:36 +0200826 return;
827
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200828 if ((ib->flags & (CF_HIJACK|CF_DONT_READ)) || channel_full(ib)) {
Willy Tarreau46a8d922012-08-20 12:38:36 +0200829 /* stop reading */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200830 if (!(ib->flags & (CF_HIJACK|CF_DONT_READ))) /* full */
Willy Tarreau46a8d922012-08-20 12:38:36 +0200831 si->flags |= SI_FL_WAIT_ROOM;
832 conn_data_stop_recv(&si->conn);
833 }
834 else {
835 /* (re)start reading */
836 si->flags &= ~SI_FL_WAIT_ROOM;
837 conn_data_want_recv(&si->conn);
838 }
839}
840
841
Willy Tarreaude5722c2012-08-20 15:01:10 +0200842/* This function is used for inter-stream-interface calls. It is called by the
843 * producer to inform the consumer side that it may be interested in checking
844 * for data in the buffer. Note that it intentionally does not update timeouts,
845 * so that we can still check them later at wake-up.
846 */
Willy Tarreauc5788912012-08-24 18:12:41 +0200847static void stream_int_chk_snd_conn(struct stream_interface *si)
Willy Tarreaude5722c2012-08-20 15:01:10 +0200848{
Willy Tarreau7421efb2012-07-02 15:11:27 +0200849 struct channel *ob = si->ob;
Willy Tarreaude5722c2012-08-20 15:01:10 +0200850
Willy Tarreau34ffd772012-09-03 16:51:27 +0200851 if (unlikely(si->state > SI_ST_EST || (ob->flags & CF_SHUTW)))
Willy Tarreaude5722c2012-08-20 15:01:10 +0200852 return;
Willy Tarreaude5722c2012-08-20 15:01:10 +0200853
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200854 if (unlikely(channel_is_empty(ob))) /* called with nothing to send ! */
Willy Tarreaude5722c2012-08-20 15:01:10 +0200855 return;
856
857 if (!ob->pipe && /* spliced data wants to be forwarded ASAP */
858 (!(si->flags & SI_FL_WAIT_DATA) || /* not waiting for data */
859 (fdtab[si_fd(si)].ev & FD_POLL_OUT))) /* we'll be called anyway */
860 return;
861
Willy Tarreau34ffd772012-09-03 16:51:27 +0200862 if (!(si->conn.flags & CO_FL_HANDSHAKE) && si_conn_send_loop(&si->conn) < 0) {
Willy Tarreaude5722c2012-08-20 15:01:10 +0200863 /* Write error on the file descriptor. We mark the FD as STERROR so
864 * that we don't use it anymore and we notify the task.
865 */
866 fdtab[si_fd(si)].ev &= ~FD_POLL_STICKY;
Willy Tarreauf16723e2012-08-24 12:52:22 +0200867 __conn_data_stop_both(&si->conn);
Willy Tarreaude5722c2012-08-20 15:01:10 +0200868 si->flags |= SI_FL_ERR;
869 si->conn.flags |= CO_FL_ERROR;
870 goto out_wakeup;
871 }
872
873 /* OK, so now we know that some data might have been sent, and that we may
874 * have to poll first. We have to do that too if the buffer is not empty.
875 */
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200876 if (channel_is_empty(ob)) {
Willy Tarreaude5722c2012-08-20 15:01:10 +0200877 /* the connection is established but we can't write. Either the
878 * buffer is empty, or we just refrain from sending because the
879 * ->o limit was reached. Maybe we just wrote the last
880 * chunk and need to close.
881 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200882 if (((ob->flags & (CF_SHUTW|CF_HIJACK|CF_AUTO_CLOSE|CF_SHUTW_NOW)) ==
883 (CF_AUTO_CLOSE|CF_SHUTW_NOW)) &&
Willy Tarreaude5722c2012-08-20 15:01:10 +0200884 (si->state == SI_ST_EST)) {
885 si_shutw(si);
886 goto out_wakeup;
887 }
888
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200889 if ((ob->flags & (CF_SHUTW|CF_SHUTW_NOW|CF_HIJACK)) == 0)
Willy Tarreaude5722c2012-08-20 15:01:10 +0200890 si->flags |= SI_FL_WAIT_DATA;
891 ob->wex = TICK_ETERNITY;
892 }
893 else {
894 /* Otherwise there are remaining data to be sent in the buffer,
895 * which means we have to poll before doing so.
896 */
Willy Tarreauf16723e2012-08-24 12:52:22 +0200897 __conn_data_want_send(&si->conn);
Willy Tarreaude5722c2012-08-20 15:01:10 +0200898 si->flags &= ~SI_FL_WAIT_DATA;
899 if (!tick_isset(ob->wex))
900 ob->wex = tick_add_ifset(now_ms, ob->wto);
901 }
902
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200903 if (likely(ob->flags & CF_WRITE_ACTIVITY)) {
Willy Tarreaude5722c2012-08-20 15:01:10 +0200904 /* update timeout if we have written something */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200905 if ((ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200906 !channel_is_empty(ob))
Willy Tarreaude5722c2012-08-20 15:01:10 +0200907 ob->wex = tick_add_ifset(now_ms, ob->wto);
908
909 if (tick_isset(si->ib->rex) && !(si->flags & SI_FL_INDEP_STR)) {
910 /* Note: to prevent the client from expiring read timeouts
911 * during writes, we refresh it. We only do this if the
912 * interface is not configured for "independent streams",
913 * because for some applications it's better not to do this,
914 * for instance when continuously exchanging small amounts
915 * of data which can full the socket buffers long before a
916 * write timeout is detected.
917 */
918 si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
919 }
920 }
921
922 /* in case of special condition (error, shutdown, end of write...), we
923 * have to notify the task.
924 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200925 if (likely((ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR|CF_SHUTW)) ||
Willy Tarreau8e21bb92012-08-24 22:40:29 +0200926 (channel_is_empty(ob) && !ob->to_forward) ||
Willy Tarreaude5722c2012-08-20 15:01:10 +0200927 si->state != SI_ST_EST)) {
928 out_wakeup:
929 if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
930 task_wakeup(si->owner, TASK_WOKEN_IO);
931 }
Willy Tarreauf16723e2012-08-24 12:52:22 +0200932
933 /* commit possible polling changes */
934 conn_cond_update_polling(&si->conn);
Willy Tarreaude5722c2012-08-20 15:01:10 +0200935}
936
Willy Tarreaueecf6ca2012-08-20 15:09:53 +0200937/*
Willy Tarreauce323de2012-08-20 21:41:06 +0200938 * This is the callback which is called by the connection layer to receive data
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200939 * into the buffer from the connection. It iterates over the transport layer's
940 * rcv_buf function.
Willy Tarreauce323de2012-08-20 21:41:06 +0200941 */
Willy Tarreau4aa36832012-10-02 20:07:22 +0200942static void si_conn_recv_cb(struct connection *conn)
Willy Tarreauce323de2012-08-20 21:41:06 +0200943{
Willy Tarreaue603e692012-09-27 22:20:41 +0200944 struct stream_interface *si = conn->owner;
Willy Tarreauce323de2012-08-20 21:41:06 +0200945 struct channel *b = si->ib;
946 int ret, max, cur_read;
947 int read_poll = MAX_READ_POLL_LOOPS;
948
949 /* stop immediately on errors. Note that we DON'T want to stop on
950 * POLL_ERR, as the poller might report a write error while there
951 * are still data available in the recv buffer. This typically
952 * happens when we send too large a request to a backend server
953 * which rejects it before reading it all.
954 */
955 if (conn->flags & CO_FL_ERROR)
956 goto out_error;
957
958 /* stop here if we reached the end of data */
959 if (conn_data_read0_pending(conn))
960 goto out_shutdown_r;
961
962 /* maybe we were called immediately after an asynchronous shutr */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200963 if (b->flags & CF_SHUTR)
Willy Tarreauce323de2012-08-20 21:41:06 +0200964 return;
965
Willy Tarreau96199b12012-08-24 00:46:52 +0200966 cur_read = 0;
Willy Tarreau96199b12012-08-24 00:46:52 +0200967
968 /* First, let's see if we may splice data across the channel without
969 * using a buffer.
970 */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200971 if (conn->xprt->rcv_pipe &&
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200972 b->to_forward >= MIN_SPLICE_FORWARD && b->flags & CF_KERN_SPLICING) {
Willy Tarreau96199b12012-08-24 00:46:52 +0200973 if (buffer_not_empty(&b->buf)) {
974 /* We're embarrassed, there are already data pending in
975 * the buffer and we don't want to have them at two
976 * locations at a time. Let's indicate we need some
977 * place and ask the consumer to hurry.
978 */
979 goto abort_splice;
980 }
Willy Tarreauce323de2012-08-20 21:41:06 +0200981
Willy Tarreau96199b12012-08-24 00:46:52 +0200982 if (unlikely(b->pipe == NULL)) {
983 if (pipes_used >= global.maxpipes || !(b->pipe = get_pipe())) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200984 b->flags &= ~CF_KERN_SPLICING;
Willy Tarreau96199b12012-08-24 00:46:52 +0200985 goto abort_splice;
986 }
987 }
988
Willy Tarreauf7bc57c2012-10-03 00:19:48 +0200989 ret = conn->xprt->rcv_pipe(conn, b->pipe, b->to_forward);
Willy Tarreau96199b12012-08-24 00:46:52 +0200990 if (ret < 0) {
991 /* splice not supported on this end, let's disable it */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200992 b->flags &= ~CF_KERN_SPLICING;
Willy Tarreau96199b12012-08-24 00:46:52 +0200993 goto abort_splice;
994 }
Willy Tarreauce323de2012-08-20 21:41:06 +0200995
Willy Tarreau96199b12012-08-24 00:46:52 +0200996 if (ret > 0) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +0200997 if (b->to_forward != CHN_INFINITE_FORWARD)
Willy Tarreau96199b12012-08-24 00:46:52 +0200998 b->to_forward -= ret;
999 b->total += ret;
1000 cur_read += ret;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001001 b->flags |= CF_READ_PARTIAL;
Willy Tarreauce323de2012-08-20 21:41:06 +02001002 }
Willy Tarreau96199b12012-08-24 00:46:52 +02001003
1004 if (conn_data_read0_pending(conn))
1005 goto out_shutdown_r;
1006
1007 if (conn->flags & CO_FL_ERROR)
1008 goto out_error;
1009
Willy Tarreau56a77e52012-09-02 18:34:44 +02001010 if (conn->flags & CO_FL_WAIT_ROOM) /* most likely the pipe is full */
1011 si->flags |= SI_FL_WAIT_ROOM;
1012
Willy Tarreauce323de2012-08-20 21:41:06 +02001013 /* splice not possible (anymore), let's go on on standard copy */
1014 }
Willy Tarreau96199b12012-08-24 00:46:52 +02001015
1016 abort_splice:
1017 /* release the pipe if we can, which is almost always the case */
1018 if (b->pipe && !b->pipe->data) {
1019 put_pipe(b->pipe);
1020 b->pipe = NULL;
1021 }
1022
Willy Tarreau56a77e52012-09-02 18:34:44 +02001023 while (!b->pipe && !(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_DATA_RD_SH | CO_FL_WAIT_RD | CO_FL_WAIT_ROOM | CO_FL_HANDSHAKE))) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001024 max = bi_avail(b);
1025
1026 if (!max) {
Willy Tarreau56a77e52012-09-02 18:34:44 +02001027 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreauce323de2012-08-20 21:41:06 +02001028 break;
1029 }
1030
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001031 ret = conn->xprt->rcv_buf(conn, &b->buf, max);
Willy Tarreauce323de2012-08-20 21:41:06 +02001032 if (ret <= 0)
1033 break;
1034
1035 cur_read += ret;
1036
1037 /* if we're allowed to directly forward data, we must update ->o */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001038 if (b->to_forward && !(b->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001039 unsigned long fwd = ret;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001040 if (b->to_forward != CHN_INFINITE_FORWARD) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001041 if (fwd > b->to_forward)
1042 fwd = b->to_forward;
1043 b->to_forward -= fwd;
1044 }
Willy Tarreaua75bcef2012-08-24 22:56:11 +02001045 b_adv(&b->buf, fwd);
Willy Tarreauce323de2012-08-20 21:41:06 +02001046 }
1047
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001048 b->flags |= CF_READ_PARTIAL;
Willy Tarreauce323de2012-08-20 21:41:06 +02001049 b->total += ret;
1050
Willy Tarreauad1cc3d2012-08-27 18:54:20 +02001051 if (channel_full(b)) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001052 /* The buffer is now full, there's no point in going through
1053 * the loop again.
1054 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001055 if (!(b->flags & CF_STREAMER_FAST) && (cur_read == buffer_len(&b->buf))) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001056 b->xfer_small = 0;
1057 b->xfer_large++;
1058 if (b->xfer_large >= 3) {
1059 /* we call this buffer a fast streamer if it manages
1060 * to be filled in one call 3 consecutive times.
1061 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001062 b->flags |= (CF_STREAMER | CF_STREAMER_FAST);
Willy Tarreauce323de2012-08-20 21:41:06 +02001063 //fputc('+', stderr);
1064 }
1065 }
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001066 else if ((b->flags & (CF_STREAMER | CF_STREAMER_FAST)) &&
Willy Tarreauce323de2012-08-20 21:41:06 +02001067 (cur_read <= b->buf.size / 2)) {
1068 b->xfer_large = 0;
1069 b->xfer_small++;
1070 if (b->xfer_small >= 2) {
1071 /* if the buffer has been at least half full twice,
1072 * we receive faster than we send, so at least it
1073 * is not a "fast streamer".
1074 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001075 b->flags &= ~CF_STREAMER_FAST;
Willy Tarreauce323de2012-08-20 21:41:06 +02001076 //fputc('-', stderr);
1077 }
1078 }
1079 else {
1080 b->xfer_small = 0;
1081 b->xfer_large = 0;
1082 }
1083
Willy Tarreauce323de2012-08-20 21:41:06 +02001084 si->flags |= SI_FL_WAIT_ROOM;
1085 break;
1086 }
1087
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001088 if ((b->flags & CF_READ_DONTWAIT) || --read_poll <= 0)
Willy Tarreauce323de2012-08-20 21:41:06 +02001089 break;
1090
1091 /* if too many bytes were missing from last read, it means that
1092 * it's pointless trying to read again because the system does
1093 * not have them in buffers.
1094 */
1095 if (ret < max) {
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001096 if ((b->flags & (CF_STREAMER | CF_STREAMER_FAST)) &&
Willy Tarreauce323de2012-08-20 21:41:06 +02001097 (cur_read <= b->buf.size / 2)) {
1098 b->xfer_large = 0;
1099 b->xfer_small++;
1100 if (b->xfer_small >= 3) {
1101 /* we have read less than half of the buffer in
1102 * one pass, and this happened at least 3 times.
1103 * This is definitely not a streamer.
1104 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001105 b->flags &= ~(CF_STREAMER | CF_STREAMER_FAST);
Willy Tarreauce323de2012-08-20 21:41:06 +02001106 //fputc('!', stderr);
1107 }
1108 }
1109
1110 /* if a streamer has read few data, it may be because we
1111 * have exhausted system buffers. It's not worth trying
1112 * again.
1113 */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001114 if (b->flags & CF_STREAMER)
Willy Tarreauce323de2012-08-20 21:41:06 +02001115 break;
1116
1117 /* if we read a large block smaller than what we requested,
1118 * it's almost certain we'll never get anything more.
1119 */
1120 if (ret >= global.tune.recv_enough)
1121 break;
1122 }
1123 } /* while !flags */
1124
Willy Tarreau96199b12012-08-24 00:46:52 +02001125 if (conn->flags & CO_FL_ERROR)
1126 goto out_error;
1127
Willy Tarreauce323de2012-08-20 21:41:06 +02001128 if (conn_data_read0_pending(conn))
1129 /* connection closed */
1130 goto out_shutdown_r;
1131
1132 return;
1133
1134 out_shutdown_r:
1135 /* we received a shutdown */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001136 b->flags |= CF_READ_NULL;
1137 if (b->flags & CF_AUTO_CLOSE)
Willy Tarreau8263d2b2012-08-28 00:06:31 +02001138 channel_shutw_now(b);
Willy Tarreauce323de2012-08-20 21:41:06 +02001139 stream_sock_read0(si);
1140 conn_data_read0(conn);
1141 return;
1142
1143 out_error:
1144 /* Read error on the connection, report the error and stop I/O */
1145 conn->flags |= CO_FL_ERROR;
Willy Tarreauce323de2012-08-20 21:41:06 +02001146}
1147
1148/*
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001149 * This is the callback which is called by the connection layer to send data
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001150 * from the buffer to the connection. It iterates over the transport layer's
1151 * snd_buf function.
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001152 */
Willy Tarreau4aa36832012-10-02 20:07:22 +02001153static void si_conn_send_cb(struct connection *conn)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001154{
Willy Tarreaue603e692012-09-27 22:20:41 +02001155 struct stream_interface *si = conn->owner;
Willy Tarreau7421efb2012-07-02 15:11:27 +02001156 struct channel *b = si->ob;
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001157
1158 if (conn->flags & CO_FL_ERROR)
1159 goto out_error;
1160
1161 if (si->conn.flags & CO_FL_HANDSHAKE)
1162 /* a handshake was requested */
1163 return;
1164
1165 /* we might have been called just after an asynchronous shutw */
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001166 if (b->flags & CF_SHUTW)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001167 return;
1168
1169 /* OK there are data waiting to be sent */
Willy Tarreau5368d802012-08-21 18:22:06 +02001170 if (si_conn_send_loop(conn) < 0)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001171 goto out_error;
1172
1173 /* OK all done */
1174 return;
1175
1176 out_error:
1177 /* Write error on the connection, report the error and stop I/O */
1178 conn->flags |= CO_FL_ERROR;
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001179}
1180
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001181/*
1182 * This function propagates a null read received on a socket-based connection.
1183 * It updates the stream interface. If the stream interface has SI_FL_NOHALF,
1184 * the close is also forwarded to the write side as an abort. This function is
1185 * still socket-specific as it handles a setsockopt() call to set the SO_LINGER
1186 * state on the socket.
1187 */
1188void stream_sock_read0(struct stream_interface *si)
1189{
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001190 si->ib->flags &= ~CF_SHUTR_NOW;
1191 if (si->ib->flags & CF_SHUTR)
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001192 return;
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001193 si->ib->flags |= CF_SHUTR;
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001194 si->ib->rex = TICK_ETERNITY;
1195 si->flags &= ~SI_FL_WAIT_ROOM;
1196
1197 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
1198 return;
1199
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001200 if (si->ob->flags & CF_SHUTW)
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001201 goto do_close;
1202
1203 if (si->flags & SI_FL_NOHALF) {
1204 /* we want to immediately forward this close to the write side */
1205 if (si->flags & SI_FL_NOLINGER) {
1206 si->flags &= ~SI_FL_NOLINGER;
1207 setsockopt(si_fd(si), SOL_SOCKET, SO_LINGER,
1208 (struct linger *) &nolinger, sizeof(struct linger));
1209 }
1210 /* force flag on ssl to keep session in cache */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001211 if (si->conn.xprt->shutw)
1212 si->conn.xprt->shutw(&si->conn, 0);
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001213 goto do_close;
1214 }
1215
1216 /* otherwise that's just a normal read shutdown */
Willy Tarreauf16723e2012-08-24 12:52:22 +02001217 __conn_data_stop_recv(&si->conn);
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001218 return;
1219
1220 do_close:
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001221 conn_xprt_close(&si->conn);
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001222 fd_delete(si_fd(si));
1223 si->state = SI_ST_DIS;
1224 si->exp = TICK_ETERNITY;
1225 if (si->release)
1226 si->release(si);
1227 return;
1228}
1229
Willy Tarreaudded32d2008-11-30 19:48:07 +01001230/*
Willy Tarreaucff64112008-11-03 06:26:53 +01001231 * Local variables:
1232 * c-indent-level: 8
1233 * c-basic-offset: 8
1234 * End:
1235 */