blob: 5213dcdc26cfac1fe3c666b2f937841baf9aa2e2 [file] [log] [blame]
/*
* Server management functions.
*
* Copyright 2000-2008 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdlib.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/memory.h>
#include <types/capture.h>
#include <types/global.h>
#include <proto/acl.h>
#include <proto/backend.h>
#include <proto/buffers.h>
#include <proto/hdr_idx.h>
#include <proto/log.h>
#include <proto/session.h>
#include <proto/pipe.h>
#include <proto/proto_http.h>
#include <proto/proto_tcp.h>
#include <proto/proxy.h>
#include <proto/queue.h>
#include <proto/server.h>
#include <proto/stream_interface.h>
#include <proto/stream_sock.h>
#include <proto/task.h>
struct pool_head *pool2_session;
struct list sessions;
/*
* frees the context associated to a session. It must have been removed first.
*/
void session_free(struct session *s)
{
struct http_txn *txn = &s->txn;
struct proxy *fe = s->fe;
struct bref *bref, *back;
if (s->pend_pos)
pendconn_free(s->pend_pos);
if (s->srv) { /* there may be requests left pending in queue */
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
}
if (unlikely(s->srv_conn)) {
/* the session still has a reserved slot on a server, but
* it should normally be only the same as the one above,
* so this should not happen in fact.
*/
sess_change_server(s, NULL);
}
if (s->req->pipe)
put_pipe(s->req->pipe);
if (s->rep->pipe)
put_pipe(s->rep->pipe);
pool_free2(pool2_buffer, s->req);
pool_free2(pool2_buffer, s->rep);
if (fe) {
pool_free2(fe->hdr_idx_pool, txn->hdr_idx.v);
if (txn->rsp.cap != NULL) {
struct cap_hdr *h;
for (h = fe->rsp_cap; h; h = h->next)
pool_free2(h->pool, txn->rsp.cap[h->index]);
pool_free2(fe->rsp_cap_pool, txn->rsp.cap);
}
if (txn->req.cap != NULL) {
struct cap_hdr *h;
for (h = fe->req_cap; h; h = h->next)
pool_free2(h->pool, txn->req.cap[h->index]);
pool_free2(fe->req_cap_pool, txn->req.cap);
}
}
pool_free2(pool2_requri, txn->uri);
pool_free2(pool2_capture, txn->cli_cookie);
pool_free2(pool2_capture, txn->srv_cookie);
list_for_each_entry_safe(bref, back, &s->back_refs, users) {
/* we have to unlink all watchers. We must not relink them if
* this session was the last one in the list.
*/
LIST_DEL(&bref->users);
LIST_INIT(&bref->users);
if (s->list.n != &sessions)
LIST_ADDQ(&LIST_ELEM(s->list.n, struct session *, list)->back_refs, &bref->users);
bref->ref = s->list.n;
}
LIST_DEL(&s->list);
pool_free2(pool2_session, s);
/* We may want to free the maximum amount of pools if the proxy is stopping */
if (fe && unlikely(fe->state == PR_STSTOPPED)) {
pool_flush2(pool2_buffer);
pool_flush2(fe->hdr_idx_pool);
pool_flush2(pool2_requri);
pool_flush2(pool2_capture);
pool_flush2(pool2_session);
pool_flush2(fe->req_cap_pool);
pool_flush2(fe->rsp_cap_pool);
}
}
/* perform minimal intializations, report 0 in case of error, 1 if OK. */
int init_session()
{
LIST_INIT(&sessions);
pool2_session = create_pool("session", sizeof(struct session), MEM_F_SHARED);
return pool2_session != NULL;
}
void session_process_counters(struct session *s)
{
unsigned long long bytes;
if (s->req) {
bytes = s->req->total - s->logs.bytes_in;
s->logs.bytes_in = s->req->total;
if (bytes) {
s->fe->bytes_in += bytes;
if (s->be != s->fe)
s->be->bytes_in += bytes;
if (s->srv)
s->srv->bytes_in += bytes;
}
}
if (s->rep) {
bytes = s->rep->total - s->logs.bytes_out;
s->logs.bytes_out = s->rep->total;
if (bytes) {
s->fe->bytes_out += bytes;
if (s->be != s->fe)
s->be->bytes_out += bytes;
if (s->srv)
s->srv->bytes_out += bytes;
}
}
}
/* This function is called with (si->state == SI_ST_CON) meaning that a
* connection was attempted and that the file descriptor is already allocated.
* We must check for establishment, error and abort. Possible output states
* are SI_ST_EST (established), SI_ST_CER (error), SI_ST_DIS (abort), and
* SI_ST_CON (no change). The function returns 0 if it switches to SI_ST_CER,
* otherwise 1.
*/
int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
{
struct buffer *req = si->ob;
struct buffer *rep = si->ib;
/* If we got an error, or if nothing happened and the connection timed
* out, we must give up. The CER state handler will take care of retry
* attempts and error reports.
*/
if (unlikely(si->flags & (SI_FL_EXP|SI_FL_ERR))) {
si->exp = TICK_ETERNITY;
si->state = SI_ST_CER;
si->flags &= ~SI_FL_CAP_SPLICE;
fd_delete(si->fd);
if (si->err_type)
return 0;
si->err_loc = s->srv;
if (si->flags & SI_FL_ERR)
si->err_type = SI_ET_CONN_ERR;
else
si->err_type = SI_ET_CONN_TO;
return 0;
}
/* OK, maybe we want to abort */
if (unlikely((req->flags & BF_SHUTW_NOW) ||
(rep->flags & BF_SHUTW) ||
((req->flags & BF_SHUTR) && /* FIXME: this should not prevent a connection from establishing */
(((req->flags & (BF_EMPTY|BF_WRITE_ACTIVITY)) == BF_EMPTY) ||
s->be->options & PR_O_ABRT_CLOSE)))) {
/* give up */
si->shutw(si);
si->err_type |= SI_ET_CONN_ABRT;
si->err_loc = s->srv;
si->flags &= ~SI_FL_CAP_SPLICE;
if (s->srv_error)
s->srv_error(s, si);
return 1;
}
/* we need to wait a bit more if there was no activity either */
if (!(req->flags & BF_WRITE_ACTIVITY))
return 1;
/* OK, this means that a connection succeeded. The caller will be
* responsible for handling the transition from CON to EST.
*/
s->logs.t_connect = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->exp = TICK_ETERNITY;
si->state = SI_ST_EST;
si->err_type = SI_ET_NONE;
si->err_loc = NULL;
return 1;
}
/* This function is called with (si->state == SI_ST_CER) meaning that a
* previous connection attempt has failed and that the file descriptor
* has already been released. Possible causes include asynchronous error
* notification and time out. Possible output states are SI_ST_CLO when
* retries are exhausted, SI_ST_TAR when a delay is wanted before a new
* connection attempt, SI_ST_ASS when it's wise to retry on the same server,
* and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
* marked as in error state. It returns 0.
*/
int sess_update_st_cer(struct session *s, struct stream_interface *si)
{
/* we probably have to release last session from the server */
if (s->srv) {
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
}
/* ensure that we have enough retries left */
s->conn_retries--;
if (s->conn_retries < 0) {
if (!si->err_type) {
si->err_type = SI_ET_CONN_ERR;
si->err_loc = s->srv;
}
if (s->srv)
s->srv->failed_conns++;
s->be->failed_conns++;
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
/* shutw is enough so stop a connecting socket */
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
si->ib->flags |= BF_READ_ERROR;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return 0;
}
/* If the "redispatch" option is set on the backend, we are allowed to
* retry on another server for the last retry. In order to achieve this,
* we must mark the session unassigned, and eventually clear the DIRECT
* bit to ignore any persistence cookie. We won't count a retry nor a
* redispatch yet, because this will depend on what server is selected.
*/
if (s->srv && s->conn_retries == 0 && s->be->options & PR_O_REDISP) {
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
s->flags &= ~(SN_DIRECT | SN_ASSIGNED | SN_ADDR_SET);
s->prev_srv = s->srv;
si->state = SI_ST_REQ;
} else {
if (s->srv)
s->srv->retries++;
s->be->retries++;
si->state = SI_ST_ASS;
}
if (si->flags & SI_FL_ERR) {
/* The error was an asynchronous connection error, and we will
* likely have to retry connecting to the same server, most
* likely leading to the same result. To avoid this, we wait
* one second before retrying.
*/
if (!si->err_type)
si->err_type = SI_ET_CONN_ERR;
si->state = SI_ST_TAR;
si->exp = tick_add(now_ms, MS_TO_TICKS(1000));
return 0;
}
return 0;
}
/*
* This function handles the transition between the SI_ST_CON state and the
* SI_ST_EST state. It must only be called after switching from SI_ST_CON to
* SI_ST_EST.
*/
void sess_establish(struct session *s, struct stream_interface *si)
{
struct buffer *req = si->ob;
struct buffer *rep = si->ib;
if (s->be->mode == PR_MODE_TCP) { /* let's allow immediate data connection in this case */
buffer_set_rlim(rep, BUFSIZE); /* no rewrite needed */
/* if the user wants to log as soon as possible, without counting
* bytes from the server, then this is the right moment. */
if (s->fe->to_log && !(s->logs.logwait & LW_BYTES)) {
s->logs.t_close = s->logs.t_connect; /* to get a valid end date */
s->do_log(s);
}
}
else {
rep->analysers |= AN_RTR_HTTP_HDR;
buffer_set_rlim(rep, BUFSIZE - MAXREWRITE); /* rewrite needed */
s->txn.rsp.msg_state = HTTP_MSG_RPBEFORE;
/* reset hdr_idx which was already initialized by the request.
* right now, the http parser does it.
* hdr_idx_init(&s->txn.hdr_idx);
*/
}
rep->flags |= BF_READ_ATTACHED; /* producer is now attached */
req->wex = TICK_ETERNITY;
}
/* Update stream interface status for input states SI_ST_ASS, SI_ST_QUE, SI_ST_TAR.
* Other input states are simply ignored.
* Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON.
* Flags must have previously been updated for timeouts and other conditions.
*/
void sess_update_stream_int(struct session *s, struct stream_interface *si)
{
DPRINTF(stderr,"[%u] %s: sess=%p rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d\n",
now_ms, __FUNCTION__,
s,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state);
if (si->state == SI_ST_ASS) {
/* Server assigned to connection request, we have to try to connect now */
int conn_err;
conn_err = connect_server(s);
if (conn_err == SN_ERR_NONE) {
/* state = SI_ST_CON now */
if (s->srv)
srv_inc_sess_ctr(s->srv);
return;
}
/* We have received a synchronous error. We might have to
* abort, retry immediately or redispatch.
*/
if (conn_err == SN_ERR_INTERNAL) {
if (!si->err_type) {
si->err_type = SI_ET_CONN_OTHER;
si->err_loc = s->srv;
}
if (s->srv)
srv_inc_sess_ctr(s->srv);
if (s->srv)
s->srv->failed_conns++;
s->be->failed_conns++;
/* release other sessions waiting for this server */
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
/* Failed and not retryable. */
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
/* no session was ever accounted for this server */
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* We are facing a retryable error, but we don't want to run a
* turn-around now, as the problem is likely a source port
* allocation problem, so we want to retry now.
*/
si->state = SI_ST_CER;
si->flags &= ~SI_FL_ERR;
sess_update_st_cer(s, si);
/* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
return;
}
else if (si->state == SI_ST_QUE) {
/* connection request was queued, check for any update */
if (!s->pend_pos) {
/* The connection is not in the queue anymore. Either
* we have a server connection slot available and we
* go directly to the assigned state, or we need to
* load-balance first and go to the INI state.
*/
si->exp = TICK_ETERNITY;
if (unlikely(!(s->flags & SN_ASSIGNED)))
si->state = SI_ST_REQ;
else {
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->state = SI_ST_ASS;
}
return;
}
/* Connection request still in queue... */
if (si->flags & SI_FL_EXP) {
/* ... and timeout expired */
si->exp = TICK_ETERNITY;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
if (s->srv)
s->srv->failed_conns++;
s->be->failed_conns++;
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_TIMEOUT;
if (!si->err_type)
si->err_type = SI_ET_QUEUE_TO;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* Connection remains in queue, check if we have to abort it */
if ((si->ob->flags & (BF_READ_ERROR|BF_SHUTW_NOW)) || /* abort requested */
((si->ob->flags & BF_SHUTR) && /* empty and client stopped */
(si->ob->flags & BF_EMPTY || s->be->options & PR_O_ABRT_CLOSE))) {
/* give up */
si->exp = TICK_ETERNITY;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->shutr(si);
si->shutw(si);
si->err_type |= SI_ET_QUEUE_ABRT;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* Nothing changed */
return;
}
else if (si->state == SI_ST_TAR) {
/* Connection request might be aborted */
if ((si->ob->flags & (BF_READ_ERROR|BF_SHUTW_NOW)) || /* abort requested */
((si->ob->flags & BF_SHUTR) && /* empty and client stopped */
(si->ob->flags & BF_EMPTY || s->be->options & PR_O_ABRT_CLOSE))) {
/* give up */
si->exp = TICK_ETERNITY;
si->shutr(si);
si->shutw(si);
si->err_type |= SI_ET_CONN_ABRT;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
if (!(si->flags & SI_FL_EXP))
return; /* still in turn-around */
si->exp = TICK_ETERNITY;
/* we keep trying on the same server as long as the session is
* marked "assigned".
* FIXME: Should we force a redispatch attempt when the server is down ?
*/
if (s->flags & SN_ASSIGNED)
si->state = SI_ST_ASS;
else
si->state = SI_ST_REQ;
return;
}
}
/* This function initiates a server connection request on a stream interface
* already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS,
* indicating that a server has been assigned. It may also return SI_ST_QUE,
* or SI_ST_CLO upon error.
*/
static void sess_prepare_conn_req(struct session *s, struct stream_interface *si) {
DPRINTF(stderr,"[%u] %s: sess=%p rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d\n",
now_ms, __FUNCTION__,
s,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state);
if (si->state != SI_ST_REQ)
return;
/* Try to assign a server */
if (srv_redispatch_connect(s) != 0) {
/* We did not get a server. Either we queued the
* connection request, or we encountered an error.
*/
if (si->state == SI_ST_QUE)
return;
/* we did not get any server, let's check the cause */
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
if (!si->err_type)
si->err_type = SI_ET_CONN_OTHER;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* The server is assigned */
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->state = SI_ST_ASS;
}
/* This stream analyser checks the switching rules and changes the backend
* if appropriate. The default_backend rule is also considered.
* It returns 1 if the processing can continue on next analysers, or zero if it
* either needs more data or wants to immediately abort the request.
*/
int process_switching_rules(struct session *s, struct buffer *req, int an_bit)
{
req->analysers &= ~an_bit;
req->analyse_exp = TICK_ETERNITY;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
req->l,
req->analysers);
/* now check whether we have some switching rules for this request */
if (!(s->flags & SN_BE_ASSIGNED)) {
struct switching_rule *rule;
list_for_each_entry(rule, &s->fe->switching_rules, list) {
int ret;
ret = acl_exec_cond(rule->cond, s->fe, s, &s->txn, ACL_DIR_REQ);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
if (ret) {
if (!session_set_backend(s, rule->be.backend))
goto sw_failed;
break;
}
}
/* To ensure correct connection accounting on the backend, we
* have to assign one if it was not set (eg: a listen). This
* measure also takes care of correctly setting the default
* backend if any.
*/
if (!(s->flags & SN_BE_ASSIGNED))
if (!session_set_backend(s, s->fe->defbe.be ? s->fe->defbe.be : s->be))
goto sw_failed;
}
/* we don't want to run the HTTP filters again if the backend has not changed */
if (s->fe == s->be)
s->req->analysers &= ~AN_REQ_HTTP_PROCESS_BE;
return 1;
sw_failed:
/* immediately abort this request in case of allocation failure */
buffer_abort(s->req);
buffer_abort(s->rep);
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_RESOURCE;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_R;
s->txn.status = 500;
s->req->analysers = 0;
s->req->analyse_exp = TICK_ETERNITY;
return 0;
}
/* Processes the client, server, request and response jobs of a session task,
* then puts it back to the wait queue in a clean state, or cleans up its
* resources if it must be deleted. Returns in <next> the date the task wants
* to be woken up, or TICK_ETERNITY. In order not to call all functions for
* nothing too many times, the request and response buffers flags are monitored
* and each function is called only if at least another function has changed at
* least one flag it is interested in.
*/
struct task *process_session(struct task *t)
{
struct session *s = t->context;
unsigned int rqf_last, rpf_last;
//DPRINTF(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__,
// s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s->rep->flags);
/* This flag must explicitly be set every time */
s->req->flags &= ~BF_READ_NOEXP;
/* Keep a copy of req/rep flags so that we can detect shutdowns */
rqf_last = s->req->flags;
rpf_last = s->rep->flags;
/* 1a: Check for low level timeouts if needed. We just set a flag on
* stream interfaces when their timeouts have expired.
*/
if (unlikely(t->state & TASK_WOKEN_TIMER)) {
stream_int_check_timeouts(&s->si[0]);
stream_int_check_timeouts(&s->si[1]);
/* check buffer timeouts, and close the corresponding stream interfaces
* for future reads or writes. Note: this will also concern upper layers
* but we do not touch any other flag. We must be careful and correctly
* detect state changes when calling them.
*/
buffer_check_timeouts(s->req);
if (unlikely((s->req->flags & (BF_SHUTR|BF_READ_TIMEOUT)) == BF_READ_TIMEOUT))
s->req->prod->shutr(s->req->prod);
if (unlikely((s->req->flags & (BF_SHUTW|BF_WRITE_TIMEOUT)) == BF_WRITE_TIMEOUT))
s->req->cons->shutw(s->req->cons);
buffer_check_timeouts(s->rep);
if (unlikely((s->rep->flags & (BF_SHUTR|BF_READ_TIMEOUT)) == BF_READ_TIMEOUT))
s->rep->prod->shutr(s->rep->prod);
if (unlikely((s->rep->flags & (BF_SHUTW|BF_WRITE_TIMEOUT)) == BF_WRITE_TIMEOUT))
s->rep->cons->shutw(s->rep->cons);
}
/* 1b: check for low-level errors reported at the stream interface.
* First we check if it's a retryable error (in which case we don't
* want to tell the buffer). Otherwise we report the error one level
* upper by setting flags into the buffers. Note that the side towards
* the client cannot have connect (hence retryable) errors. Also, the
* connection setup code must be able to deal with any type of abort.
*/
if (unlikely(s->si[0].flags & SI_FL_ERR)) {
if (s->si[0].state == SI_ST_EST || s->si[0].state == SI_ST_DIS) {
s->si[0].shutr(&s->si[0]);
s->si[0].shutw(&s->si[0]);
stream_int_report_error(&s->si[0]);
if (!(s->req->analysers) && !(s->rep->analysers)) {
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_CLICL;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_D;
}
}
}
if (unlikely(s->si[1].flags & SI_FL_ERR)) {
if (s->si[1].state == SI_ST_EST || s->si[1].state == SI_ST_DIS) {
s->si[1].shutr(&s->si[1]);
s->si[1].shutw(&s->si[1]);
stream_int_report_error(&s->si[1]);
s->be->failed_resp++;
if (s->srv)
s->srv->failed_resp++;
if (!(s->req->analysers) && !(s->rep->analysers)) {
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_SRVCL;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_D;
}
}
/* note: maybe we should process connection errors here ? */
}
if (s->si[1].state == SI_ST_CON) {
/* we were trying to establish a connection on the server side,
* maybe it succeeded, maybe it failed, maybe we timed out, ...
*/
if (unlikely(!sess_update_st_con_tcp(s, &s->si[1])))
sess_update_st_cer(s, &s->si[1]);
else if (s->si[1].state == SI_ST_EST)
sess_establish(s, &s->si[1]);
/* state is now one of SI_ST_CON (still in progress), SI_ST_EST
* (established), SI_ST_DIS (abort), SI_ST_CLO (last error),
* SI_ST_ASS/SI_ST_TAR/SI_ST_REQ for retryable errors.
*/
}
resync_stream_interface:
/* Check for connection closure */
DPRINTF(stderr,
"[%u] %s:%d: task=%p s=%p, sfl=0x%08x, rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d, cet=0x%x set=0x%x retr=%d\n",
now_ms, __FUNCTION__, __LINE__,
t,
s, s->flags,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state,
s->rep->cons->err_type, s->req->cons->err_type,
s->conn_retries);
/* nothing special to be done on client side */
if (unlikely(s->req->prod->state == SI_ST_DIS))
s->req->prod->state = SI_ST_CLO;
/* When a server-side connection is released, we have to count it and
* check for pending connections on this server.
*/
if (unlikely(s->req->cons->state == SI_ST_DIS)) {
s->req->cons->state = SI_ST_CLO;
if (s->srv) {
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
}
}
/*
* Note: of the transient states (REQ, CER, DIS), only REQ may remain
* at this point.
*/
resync_request:
/* Analyse request */
if ((s->req->flags & BF_MASK_ANALYSER) ||
(s->req->flags ^ rqf_last) & BF_MASK_STATIC) {
unsigned int flags = s->req->flags;
if (s->req->prod->state >= SI_ST_EST) {
unsigned int last_ana = 0;
/* it's up to the analysers to reset write_ena */
buffer_write_ena(s->req);
/* We will call all analysers for which a bit is set in
* s->req->analysers, following the bit order from LSB
* to MSB. The analysers must remove themselves from
* the list when not needed. Any analyser may return 0
* to break out of the loop, either because of missing
* data to take a decision, or because it decides to
* kill the session. We loop at least once through each
* analyser, and we may loop again if other analysers
* are added in the middle.
*/
while (s->req->analysers & ~last_ana) {
last_ana = s->req->analysers;
if (s->req->analysers & AN_REQ_INSPECT) {
last_ana |= AN_REQ_INSPECT;
if (!tcp_inspect_request(s, s->req, AN_REQ_INSPECT))
break;
}
if (s->req->analysers & AN_REQ_WAIT_HTTP) {
last_ana |= AN_REQ_WAIT_HTTP;
if (!http_wait_for_request(s, s->req, AN_REQ_WAIT_HTTP))
break;
}
if (s->req->analysers & AN_REQ_HTTP_PROCESS_FE) {
last_ana |= AN_REQ_HTTP_PROCESS_FE;
if (!http_process_req_common(s, s->req, AN_REQ_HTTP_PROCESS_FE, s->fe))
break;
}
if (s->req->analysers & AN_REQ_SWITCHING_RULES) {
last_ana |= AN_REQ_SWITCHING_RULES;
if (!process_switching_rules(s, s->req, AN_REQ_SWITCHING_RULES))
break;
/* FIXME: we mait switch from TCP to HTTP and want to
* immediately loop back to the top. This is a dirty way
* of doing it, and we should find a cleaner method relying
* on a circular list of function pointers.
*/
if ((s->req->analysers & ~last_ana) & AN_REQ_WAIT_HTTP)
continue;
}
if (s->req->analysers & AN_REQ_HTTP_PROCESS_BE) {
last_ana |= AN_REQ_HTTP_PROCESS_BE;
if (!http_process_req_common(s, s->req, AN_REQ_HTTP_PROCESS_BE, s->be))
break;
}
if (s->req->analysers & AN_REQ_HTTP_INNER) {
last_ana |= AN_REQ_HTTP_INNER;
if (!http_process_request(s, s->req, AN_REQ_HTTP_INNER))
break;
}
if (s->req->analysers & AN_REQ_HTTP_TARPIT) {
last_ana |= AN_REQ_HTTP_TARPIT;
if (!http_process_tarpit(s, s->req, AN_REQ_HTTP_TARPIT))
break;
}
if (s->req->analysers & AN_REQ_HTTP_BODY) {
last_ana |= AN_REQ_HTTP_BODY;
if (!http_process_request_body(s, s->req, AN_REQ_HTTP_BODY))
break;
}
if (s->req->analysers & AN_REQ_PRST_RDP_COOKIE) {
last_ana |= AN_REQ_PRST_RDP_COOKIE;
if (!tcp_persist_rdp_cookie(s, s->req, AN_REQ_PRST_RDP_COOKIE))
break;
}
}
}
if ((s->req->flags ^ flags) & BF_MASK_STATIC) {
rqf_last = s->req->flags;
goto resync_request;
}
}
resync_response:
/* Analyse response */
if (unlikely(s->rep->flags & BF_HIJACK)) {
/* In inject mode, we wake up everytime something has
* happened on the write side of the buffer.
*/
unsigned int flags = s->rep->flags;
if ((s->rep->flags & (BF_WRITE_PARTIAL|BF_WRITE_ERROR|BF_SHUTW)) &&
!(s->rep->flags & BF_FULL)) {
s->rep->hijacker(s, s->rep);
}
if ((s->rep->flags ^ flags) & BF_MASK_STATIC) {
rpf_last = s->rep->flags;
goto resync_response;
}
}
else if ((s->rep->flags & BF_MASK_ANALYSER) ||
(s->rep->flags ^ rpf_last) & BF_MASK_STATIC) {
unsigned int flags = s->rep->flags;
if (s->rep->prod->state >= SI_ST_EST) {
/* it's up to the analysers to reset write_ena */
buffer_write_ena(s->rep);
if (s->rep->analysers)
process_response(s);
}
if ((s->rep->flags ^ flags) & BF_MASK_STATIC) {
rpf_last = s->rep->flags;
goto resync_response;
}
}
/* FIXME: here we should call protocol handlers which rely on
* both buffers.
*/
/*
* Now we propagate unhandled errors to the session
*/
if (!(s->flags & SN_ERR_MASK)) {
if (s->req->flags & (BF_READ_ERROR|BF_READ_TIMEOUT|BF_WRITE_ERROR|BF_WRITE_TIMEOUT)) {
/* Report it if the client got an error or a read timeout expired */
s->req->analysers = 0;
if (s->req->flags & BF_READ_ERROR)
s->flags |= SN_ERR_CLICL;
else if (s->req->flags & BF_READ_TIMEOUT)
s->flags |= SN_ERR_CLITO;
else if (s->req->flags & BF_WRITE_ERROR)
s->flags |= SN_ERR_SRVCL;
else
s->flags |= SN_ERR_SRVTO;
sess_set_term_flags(s);
}
else if (s->rep->flags & (BF_READ_ERROR|BF_READ_TIMEOUT|BF_WRITE_ERROR|BF_WRITE_TIMEOUT)) {
/* Report it if the server got an error or a read timeout expired */
s->rep->analysers = 0;
if (s->rep->flags & BF_READ_ERROR)
s->flags |= SN_ERR_SRVCL;
else if (s->rep->flags & BF_READ_TIMEOUT)
s->flags |= SN_ERR_SRVTO;
else if (s->rep->flags & BF_WRITE_ERROR)
s->flags |= SN_ERR_CLICL;
else
s->flags |= SN_ERR_CLITO;
sess_set_term_flags(s);
}
}
/*
* Here we take care of forwarding unhandled data. This also includes
* connection establishments and shutdown requests.
*/
/* If noone is interested in analysing data, it's time to forward
* everything. We will wake up from time to time when either send_max
* or to_forward are reached.
*/
if (!s->req->analysers &&
!(s->req->flags & (BF_HIJACK|BF_SHUTW)) &&
(s->req->prod->state >= SI_ST_EST)) {
/* This buffer is freewheeling, there's no analyser nor hijacker
* attached to it. If any data are left in, we'll permit them to
* move.
*/
buffer_flush(s->req);
/* If the producer is still connected, we'll schedule large blocks
* of data to be forwarded from the producer to the consumer (which
* might possibly not be connected yet).
*/
if (!(s->req->flags & BF_SHUTR) &&
s->req->to_forward < FORWARD_DEFAULT_SIZE)
buffer_forward(s->req, FORWARD_DEFAULT_SIZE);
}
/* check if it is wise to enable kernel splicing to forward request data */
if (!(s->req->flags & (BF_KERN_SPLICING|BF_SHUTR)) &&
s->req->to_forward &&
(global.tune.options & GTUNE_USE_SPLICE) &&
(s->si[0].flags & s->si[1].flags & SI_FL_CAP_SPLICE) &&
(pipes_used < global.maxpipes) &&
(((s->fe->options2|s->be->options2) & PR_O2_SPLIC_REQ) ||
(((s->fe->options2|s->be->options2) & PR_O2_SPLIC_AUT) &&
(s->req->flags & BF_STREAMER_FAST)))) {
s->req->flags |= BF_KERN_SPLICING;
}
/* reflect what the L7 analysers have seen last */
rqf_last = s->req->flags;
/*
* Now forward all shutdown requests between both sides of the buffer
*/
/* first, let's check if the request buffer needs to shutdown(write) */
if (unlikely((s->req->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_EMPTY|BF_HIJACK|BF_WRITE_ENA|BF_SHUTR)) ==
(BF_EMPTY|BF_WRITE_ENA|BF_SHUTR)))
buffer_shutw_now(s->req);
else if ((s->req->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_EMPTY|BF_WRITE_ENA)) == (BF_EMPTY|BF_WRITE_ENA) &&
(s->req->cons->state == SI_ST_EST) &&
s->be->options & PR_O_FORCE_CLO &&
s->rep->flags & BF_READ_ACTIVITY) {
/* We want to force the connection to the server to close,
* and the server has begun to respond. That's the right
* time.
*/
buffer_shutw_now(s->req);
}
/* shutdown(write) pending */
if (unlikely((s->req->flags & (BF_SHUTW|BF_SHUTW_NOW)) == BF_SHUTW_NOW))
s->req->cons->shutw(s->req->cons);
/* shutdown(write) done on server side, we must stop the client too */
if (unlikely((s->req->flags & (BF_SHUTW|BF_SHUTR|BF_SHUTR_NOW)) == BF_SHUTW &&
!s->req->analysers))
buffer_shutr_now(s->req);
/* shutdown(read) pending */
if (unlikely((s->req->flags & (BF_SHUTR|BF_SHUTR_NOW)) == BF_SHUTR_NOW))
s->req->prod->shutr(s->req->prod);
/* it's possible that an upper layer has requested a connection setup or abort */
if (s->req->cons->state == SI_ST_INI &&
(s->req->flags & (BF_WRITE_ENA|BF_SHUTW|BF_SHUTW_NOW))) {
if ((s->req->flags & (BF_WRITE_ENA|BF_SHUTW|BF_SHUTW_NOW)) == BF_WRITE_ENA)
s->req->cons->state = SI_ST_REQ; /* new connection requested */
else
s->req->cons->state = SI_ST_CLO; /* shutw+ini = abort */
}
/* we may have a pending connection request, or a connection waiting
* for completion.
*/
if (s->si[1].state >= SI_ST_REQ && s->si[1].state < SI_ST_CON) {
do {
/* nb: step 1 might switch from QUE to ASS, but we first want
* to give a chance to step 2 to perform a redirect if needed.
*/
if (s->si[1].state != SI_ST_REQ)
sess_update_stream_int(s, &s->si[1]);
if (s->si[1].state == SI_ST_REQ)
sess_prepare_conn_req(s, &s->si[1]);
if (s->si[1].state == SI_ST_ASS && s->srv &&
s->srv->rdr_len && (s->flags & SN_REDIRECTABLE))
perform_http_redirect(s, &s->si[1]);
} while (s->si[1].state == SI_ST_ASS);
}
/* Benchmarks have shown that it's optimal to do a full resync now */
if (s->req->prod->state == SI_ST_DIS || s->req->cons->state == SI_ST_DIS)
goto resync_stream_interface;
/* otherwise wewant to check if we need to resync the req buffer or not */
if ((s->req->flags ^ rqf_last) & BF_MASK_STATIC)
goto resync_request;
/* perform output updates to the response buffer */
/* If noone is interested in analysing data, it's time to forward
* everything. We will wake up from time to time when either send_max
* or to_forward are reached.
*/
if (!s->rep->analysers &&
!(s->rep->flags & (BF_HIJACK|BF_SHUTW)) &&
(s->rep->prod->state >= SI_ST_EST)) {
/* This buffer is freewheeling, there's no analyser nor hijacker
* attached to it. If any data are left in, we'll permit them to
* move.
*/
buffer_flush(s->rep);
/* If the producer is still connected, we'll schedule large blocks
* of data to be forwarded from the producer to the consumer (which
* might possibly not be connected yet).
*/
if (!(s->rep->flags & BF_SHUTR) &&
s->rep->to_forward < FORWARD_DEFAULT_SIZE)
buffer_forward(s->rep, FORWARD_DEFAULT_SIZE);
}
/* check if it is wise to enable kernel splicing to forward response data */
if (!(s->rep->flags & (BF_KERN_SPLICING|BF_SHUTR)) &&
s->rep->to_forward &&
(global.tune.options & GTUNE_USE_SPLICE) &&
(s->si[0].flags & s->si[1].flags & SI_FL_CAP_SPLICE) &&
(pipes_used < global.maxpipes) &&
(((s->fe->options2|s->be->options2) & PR_O2_SPLIC_RTR) ||
(((s->fe->options2|s->be->options2) & PR_O2_SPLIC_AUT) &&
(s->rep->flags & BF_STREAMER_FAST)))) {
s->rep->flags |= BF_KERN_SPLICING;
}
/* reflect what the L7 analysers have seen last */
rpf_last = s->rep->flags;
/*
* Now forward all shutdown requests between both sides of the buffer
*/
/*
* FIXME: this is probably where we should produce error responses.
*/
/* first, let's check if the response buffer needs to shutdown(write) */
if (unlikely((s->rep->flags & (BF_SHUTW|BF_SHUTW_NOW|BF_EMPTY|BF_HIJACK|BF_WRITE_ENA|BF_SHUTR)) ==
(BF_EMPTY|BF_WRITE_ENA|BF_SHUTR)))
buffer_shutw_now(s->rep);
/* shutdown(write) pending */
if (unlikely((s->rep->flags & (BF_SHUTW|BF_SHUTW_NOW)) == BF_SHUTW_NOW))
s->rep->cons->shutw(s->rep->cons);
/* shutdown(write) done on the client side, we must stop the server too */
if (unlikely((s->rep->flags & (BF_SHUTW|BF_SHUTR|BF_SHUTR_NOW)) == BF_SHUTW) &&
!s->rep->analysers)
buffer_shutr_now(s->rep);
/* shutdown(read) pending */
if (unlikely((s->rep->flags & (BF_SHUTR|BF_SHUTR_NOW)) == BF_SHUTR_NOW))
s->rep->prod->shutr(s->rep->prod);
if (s->req->prod->state == SI_ST_DIS || s->req->cons->state == SI_ST_DIS)
goto resync_stream_interface;
if (s->req->flags != rqf_last)
goto resync_request;
if ((s->rep->flags ^ rpf_last) & BF_MASK_STATIC)
goto resync_response;
/* This is needed only when debugging is enabled, to indicate
* client-side or server-side close. Please note that in the unlikely
* event where both sides would close at once, the sequence is reported
* on the server side first.
*/
if (unlikely((global.mode & MODE_DEBUG) &&
(!(global.mode & MODE_QUIET) ||
(global.mode & MODE_VERBOSE)))) {
int len;
if (s->si[1].state == SI_ST_CLO &&
s->si[1].prev_state == SI_ST_EST) {
len = sprintf(trash, "%08x:%s.srvcls[%04x:%04x]\n",
s->uniq_id, s->be->id,
(unsigned short)s->si[0].fd,
(unsigned short)s->si[1].fd);
write(1, trash, len);
}
if (s->si[0].state == SI_ST_CLO &&
s->si[0].prev_state == SI_ST_EST) {
len = sprintf(trash, "%08x:%s.clicls[%04x:%04x]\n",
s->uniq_id, s->be->id,
(unsigned short)s->si[0].fd,
(unsigned short)s->si[1].fd);
write(1, trash, len);
}
}
if (likely((s->rep->cons->state != SI_ST_CLO) ||
(s->req->cons->state > SI_ST_INI && s->req->cons->state < SI_ST_CLO))) {
if ((s->fe->options & PR_O_CONTSTATS) && (s->flags & SN_BE_ASSIGNED))
session_process_counters(s);
if (s->rep->cons->state == SI_ST_EST)
stream_sock_data_finish(s->rep->cons);
if (s->req->cons->state == SI_ST_EST)
stream_sock_data_finish(s->req->cons);
s->req->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL);
s->rep->flags &= ~(BF_READ_NULL|BF_READ_PARTIAL|BF_WRITE_NULL|BF_WRITE_PARTIAL);
s->si[0].prev_state = s->si[0].state;
s->si[1].prev_state = s->si[1].state;
s->si[0].flags &= ~(SI_FL_ERR|SI_FL_EXP);
s->si[1].flags &= ~(SI_FL_ERR|SI_FL_EXP);
/* Trick: if a request is being waiting for the server to respond,
* and if we know the server can timeout, we don't want the timeout
* to expire on the client side first, but we're still interested
* in passing data from the client to the server (eg: POST). Thus,
* we can cancel the client's request timeout if the server's
* request timeout is set and the server has not yet sent a response.
*/
if ((s->rep->flags & (BF_WRITE_ENA|BF_SHUTR)) == 0 &&
(tick_isset(s->req->wex) || tick_isset(s->rep->rex))) {
s->req->flags |= BF_READ_NOEXP;
s->req->rex = TICK_ETERNITY;
}
t->expire = tick_first(tick_first(s->req->rex, s->req->wex),
tick_first(s->rep->rex, s->rep->wex));
if (s->req->analysers)
t->expire = tick_first(t->expire, s->req->analyse_exp);
if (s->si[0].exp)
t->expire = tick_first(t->expire, s->si[0].exp);
if (s->si[1].exp)
t->expire = tick_first(t->expire, s->si[1].exp);
#ifdef DEBUG_FULL
fprintf(stderr,
"[%u] queuing with exp=%u req->rex=%u req->wex=%u req->ana_exp=%u"
" rep->rex=%u rep->wex=%u, si[0].exp=%u, si[1].exp=%u, cs=%d, ss=%d\n",
now_ms, t->expire, s->req->rex, s->req->wex, s->req->analyse_exp,
s->rep->rex, s->rep->wex, s->si[0].exp, s->si[1].exp, s->si[0].state, s->si[1].state);
#endif
#ifdef DEBUG_DEV
/* this may only happen when no timeout is set or in case of an FSM bug */
if (!tick_isset(t->expire))
ABORT_NOW();
#endif
return t; /* nothing more to do */
}
s->fe->feconn--;
if (s->flags & SN_BE_ASSIGNED)
s->be->beconn--;
actconn--;
if (unlikely((global.mode & MODE_DEBUG) &&
(!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
int len;
len = sprintf(trash, "%08x:%s.closed[%04x:%04x]\n",
s->uniq_id, s->be->id,
(unsigned short)s->req->prod->fd, (unsigned short)s->req->cons->fd);
write(1, trash, len);
}
s->logs.t_close = tv_ms_elapsed(&s->logs.tv_accept, &now);
session_process_counters(s);
/* let's do a final log if we need it */
if (s->logs.logwait &&
!(s->flags & SN_MONITOR) &&
(!(s->fe->options & PR_O_NULLNOLOG) || s->req->total)) {
s->do_log(s);
}
/* the task MUST not be in the run queue anymore */
session_free(s);
task_delete(t);
task_free(t);
return NULL;
}
/*
* This function adjusts sess->srv_conn and maintains the previous and new
* server's served session counts. Setting newsrv to NULL is enough to release
* current connection slot. This function also notifies any LB algo which might
* expect to be informed about any change in the number of active sessions on a
* server.
*/
void sess_change_server(struct session *sess, struct server *newsrv)
{
if (sess->srv_conn == newsrv)
return;
if (sess->srv_conn) {
sess->srv_conn->served--;
if (sess->srv_conn->proxy->lbprm.server_drop_conn)
sess->srv_conn->proxy->lbprm.server_drop_conn(sess->srv_conn);
sess->srv_conn = NULL;
}
if (newsrv) {
newsrv->served++;
if (newsrv->proxy->lbprm.server_take_conn)
newsrv->proxy->lbprm.server_take_conn(newsrv);
sess->srv_conn = newsrv;
}
}
/* Set correct session termination flags in case no analyser has done it. It
* also counts a failed request if the server state has not reached the request
* stage.
*/
void sess_set_term_flags(struct session *s)
{
if (!(s->flags & SN_FINST_MASK)) {
if (s->si[1].state < SI_ST_REQ) {
s->fe->failed_req++;
s->flags |= SN_FINST_R;
}
else if (s->si[1].state == SI_ST_QUE)
s->flags |= SN_FINST_Q;
else if (s->si[1].state < SI_ST_EST)
s->flags |= SN_FINST_C;
else if (s->si[1].state == SI_ST_EST)
s->flags |= SN_FINST_D;
else
s->flags |= SN_FINST_L;
}
}
/* Handle server-side errors for default protocols. It is called whenever a a
* connection setup is aborted or a request is aborted in queue. It sets the
* session termination flags so that the caller does not have to worry about
* them. It's installed as ->srv_error for the server-side stream_interface.
*/
void default_srv_error(struct session *s, struct stream_interface *si)
{
int err_type = si->err_type;
int err = 0, fin = 0;
if (err_type & SI_ET_QUEUE_ABRT) {
err = SN_ERR_CLICL;
fin = SN_FINST_Q;
}
else if (err_type & SI_ET_CONN_ABRT) {
err = SN_ERR_CLICL;
fin = SN_FINST_C;
}
else if (err_type & SI_ET_QUEUE_TO) {
err = SN_ERR_SRVTO;
fin = SN_FINST_Q;
}
else if (err_type & SI_ET_QUEUE_ERR) {
err = SN_ERR_SRVCL;
fin = SN_FINST_Q;
}
else if (err_type & SI_ET_CONN_TO) {
err = SN_ERR_SRVTO;
fin = SN_FINST_C;
}
else if (err_type & SI_ET_CONN_ERR) {
err = SN_ERR_SRVCL;
fin = SN_FINST_C;
}
else /* SI_ET_CONN_OTHER and others */ {
err = SN_ERR_INTERNAL;
fin = SN_FINST_C;
}
if (!(s->flags & SN_ERR_MASK))
s->flags |= err;
if (!(s->flags & SN_FINST_MASK))
s->flags |= fin;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/