mirrors/haproxy
1
0
Fork 0
mirror of https://git.haproxy.org/git/haproxy.git/ synced 2025-10-31 08:30:59 +01:00
Code Issues Projects Releases Wiki Activity
haproxy/src/backend.c
Willy Tarreau b082186528 MEDIUM: backend: remove impossible cases from connect_server() 
Now that we start by releasing any possibly existing connection,
the conditions simplify a little bit and some of the complex cases
can be removed. A few comments were also added for non-obvious cases.
2019-07-19 13:50:09 +02:00

2337 lines
68 KiB
C
Raw Blame History

/*
* Backend variables and functions.
*
* Copyright 2000-2013 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 <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <common/buffer.h>
#include <common/compat.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/hash.h>
#include <common/htx.h>
#include <common/initcall.h>
#include <common/ticks.h>
#include <common/time.h>
#include <common/namespace.h>
#include <types/global.h>
#include <proto/acl.h>
#include <proto/arg.h>
#include <proto/backend.h>
#include <proto/channel.h>
#include <proto/frontend.h>
#include <proto/http_htx.h>
#include <proto/lb_chash.h>
#include <proto/lb_fas.h>
#include <proto/lb_fwlc.h>
#include <proto/lb_fwrr.h>
#include <proto/lb_map.h>
#include <proto/log.h>
#include <proto/mux_pt.h>
#include <proto/obj_type.h>
#include <proto/payload.h>
#include <proto/protocol.h>
#include <proto/http_ana.h>
#include <proto/proto_tcp.h>
#include <proto/proxy.h>
#include <proto/queue.h>
#include <proto/sample.h>
#include <proto/server.h>
#include <proto/session.h>
#include <proto/stream.h>
#include <proto/stream_interface.h>
#include <proto/ssl_sock.h>
#include <proto/task.h>
int be_lastsession(const struct proxy *be)
{
if (be->be_counters.last_sess)
return now.tv_sec - be->be_counters.last_sess;
return -1;
}
/* helper function to invoke the correct hash method */
static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
{
unsigned int hash;
switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
case BE_LB_HFCN_DJB2:
hash = hash_djb2(key, len);
break;
case BE_LB_HFCN_WT6:
hash = hash_wt6(key, len);
break;
case BE_LB_HFCN_CRC32:
hash = hash_crc32(key, len);
break;
case BE_LB_HFCN_SDBM:
/* this is the default hash function */
default:
hash = hash_sdbm(key, len);
break;
}
return hash;
}
/*
* This function recounts the number of usable active and backup servers for
* proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
* This function also recomputes the total active and backup weights. However,
* it does not update tot_weight nor tot_used. Use update_backend_weight() for
* this.
* This functions is designed to be called before server's weight and state
* commit so it uses 'next' weight and states values.
*
* threads: this is the caller responsibility to lock data. For now, this
* function is called from lb modules, so it should be ok. But if you need to
* call it from another place, be careful (and update this comment).
*/
void recount_servers(struct proxy *px)
{
struct server *srv;
px->srv_act = px->srv_bck = 0;
px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
px->lbprm.fbck = NULL;
for (srv = px->srv; srv != NULL; srv = srv->next) {
if (!srv_willbe_usable(srv))
continue;
if (srv->flags & SRV_F_BACKUP) {
if (!px->srv_bck &&
!(px->options & PR_O_USE_ALL_BK))
px->lbprm.fbck = srv;
px->srv_bck++;
srv->cumulative_weight = px->lbprm.tot_wbck;
px->lbprm.tot_wbck += srv->next_eweight;
} else {
px->srv_act++;
srv->cumulative_weight = px->lbprm.tot_wact;
px->lbprm.tot_wact += srv->next_eweight;
}
}
}
/* This function simply updates the backend's tot_weight and tot_used values
* after servers weights have been updated. It is designed to be used after
* recount_servers() or equivalent.
*
* threads: this is the caller responsibility to lock data. For now, this
* function is called from lb modules, so it should be ok. But if you need to
* call it from another place, be careful (and update this comment).
*/
void update_backend_weight(struct proxy *px)
{
if (px->srv_act) {
px->lbprm.tot_weight = px->lbprm.tot_wact;
px->lbprm.tot_used = px->srv_act;
}
else if (px->lbprm.fbck) {
/* use only the first backup server */
px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
px->lbprm.tot_used = 1;
}
else {
px->lbprm.tot_weight = px->lbprm.tot_wbck;
px->lbprm.tot_used = px->srv_bck;
}
}
/*
* This function tries to find a running server for the proxy <px> following
* the source hash method. Depending on the number of active/backup servers,
* it will either look for active servers, or for backup servers.
* If any server is found, it will be returned. If no valid server is found,
* NULL is returned.
*/
static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
{
unsigned int h, l;
if (px->lbprm.tot_weight == 0)
return NULL;
l = h = 0;
/* note: we won't hash if there's only one server left */
if (px->lbprm.tot_used == 1)
goto hash_done;
while ((l + sizeof (int)) <= len) {
h ^= ntohl(*(unsigned int *)(&addr[l]));
l += sizeof (int);
}
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
h = full_hash(h);
hash_done:
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, h, avoid);
else
return map_get_server_hash(px, h);
}
/*
* This function tries to find a running server for the proxy <px> following
* the URI hash method. In order to optimize cache hits, the hash computation
* ends at the question mark. Depending on the number of active/backup servers,
* it will either look for active servers, or for backup servers.
* If any server is found, it will be returned. If no valid server is found,
* NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
* the "whole" optional argument (boolean), the "len" argument (numeric) and
* the "depth" argument (numeric).
*
* This code was contributed by Guillaume Dallaire, who also selected this hash
* algorithm out of a tens because it gave him the best results.
*
*/
static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
{
unsigned int hash = 0;
int c;
int slashes = 0;
const char *start, *end;
if (px->lbprm.tot_weight == 0)
return NULL;
/* note: we won't hash if there's only one server left */
if (px->lbprm.tot_used == 1)
goto hash_done;
if (px->lbprm.arg_opt2) // "len"
uri_len = MIN(uri_len, px->lbprm.arg_opt2);
start = end = uri;
while (uri_len--) {
c = *end;
if (c == '/') {
slashes++;
if (slashes == px->lbprm.arg_opt3) /* depth+1 */
break;
}
else if (c == '?' && !px->lbprm.arg_opt1) // "whole"
break;
end++;
}
hash = gen_hash(px, start, (end - start));
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
hash = full_hash(hash);
hash_done:
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, hash, avoid);
else
return map_get_server_hash(px, hash);
}
/*
* This function tries to find a running server for the proxy <px> following
* the URL parameter hash method. It looks for a specific parameter in the
* URL and hashes it to compute the server ID. This is useful to optimize
* performance by avoiding bounces between servers in contexts where sessions
* are shared but cookies are not usable. If the parameter is not found, NULL
* is returned. If any server is found, it will be returned. If no valid server
* is found, NULL is returned.
*/
static struct server *get_server_ph(struct proxy *px, const char *uri, int uri_len, const struct server *avoid)
{
unsigned int hash = 0;
const char *start, *end;
const char *p;
const char *params;
int plen;
/* when tot_weight is 0 then so is srv_count */
if (px->lbprm.tot_weight == 0)
return NULL;
if ((p = memchr(uri, '?', uri_len)) == NULL)
return NULL;
p++;
uri_len -= (p - uri);
plen = px->lbprm.arg_len;
params = p;
while (uri_len > plen) {
/* Look for the parameter name followed by an equal symbol */
if (params[plen] == '=') {
if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
/* OK, we have the parameter here at <params>, and
* the value after the equal sign, at <p>
* skip the equal symbol
*/
p += plen + 1;
start = end = p;
uri_len -= plen + 1;
while (uri_len && *end != '&') {
uri_len--;
end++;
}
hash = gen_hash(px, start, (end - start));
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
hash = full_hash(hash);
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, hash, avoid);
else
return map_get_server_hash(px, hash);
}
}
/* skip to next parameter */
p = memchr(params, '&', uri_len);
if (!p)
return NULL;
p++;
uri_len -= (p - params);
params = p;
}
return NULL;
}
/*
* this does the same as the previous server_ph, but check the body contents
*/
static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
{
unsigned int hash = 0;
struct channel *req = &s->req;
struct proxy *px = s->be;
struct htx *htx = htxbuf(&req->buf);
struct htx_blk *blk;
unsigned int plen = px->lbprm.arg_len;
unsigned long len;
const char *params, *p, *start, *end;
if (px->lbprm.tot_weight == 0)
return NULL;
p = params = NULL;
len = 0;
for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
enum htx_blk_type type = htx_get_blk_type(blk);
struct ist v;
if (type != HTX_BLK_DATA)
continue;
v = htx_get_blk_value(htx, blk);
p = params = v.ptr;
len = v.len;
break;
}
while (len > plen) {
/* Look for the parameter name followed by an equal symbol */
if (params[plen] == '=') {
if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
/* OK, we have the parameter here at <params>, and
* the value after the equal sign, at <p>
* skip the equal symbol
*/
p += plen + 1;
start = end = p;
len -= plen + 1;
while (len && *end != '&') {
if (unlikely(!HTTP_IS_TOKEN(*p))) {
/* if in a POST, body must be URI encoded or it's not a URI.
* Do not interpret any possible binary data as a parameter.
*/
if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
break;
return NULL; /* oh, no; this is not uri-encoded.
* This body does not contain parameters.
*/
}
len--;
end++;
/* should we break if vlen exceeds limit? */
}
hash = gen_hash(px, start, (end - start));
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
hash = full_hash(hash);
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, hash, avoid);
else
return map_get_server_hash(px, hash);
}
}
/* skip to next parameter */
p = memchr(params, '&', len);
if (!p)
return NULL;
p++;
len -= (p - params);
params = p;
}
return NULL;
}
/*
* This function tries to find a running server for the proxy <px> following
* the Header parameter hash method. It looks for a specific parameter in the
* URL and hashes it to compute the server ID. This is useful to optimize
* performance by avoiding bounces between servers in contexts where sessions
* are shared but cookies are not usable. If the parameter is not found, NULL
* is returned. If any server is found, it will be returned. If no valid server
* is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
* apply to the middle part of a domain name ("use_domain_only" option).
*/
static struct server *get_server_hh(struct stream *s, const struct server *avoid)
{
unsigned int hash = 0;
struct proxy *px = s->be;
unsigned int plen = px->lbprm.arg_len;
unsigned long len;
const char *p;
const char *start, *end;
struct htx *htx = htxbuf(&s->req.buf);
struct http_hdr_ctx ctx = { .blk = NULL };
/* tot_weight appears to mean srv_count */
if (px->lbprm.tot_weight == 0)
return NULL;
/* note: we won't hash if there's only one server left */
if (px->lbprm.tot_used == 1)
goto hash_done;
http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
/* if the header is not found or empty, let's fallback to round robin */
if (!ctx.blk || !ctx.value.len)
return NULL;
/* Found a the param_name in the headers.
* we will compute the hash based on this value ctx.val.
*/
len = ctx.value.len;
p = ctx.value.ptr;
if (!px->lbprm.arg_opt1) {
hash = gen_hash(px, p, len);
} else {
int dohash = 0;
p += len;
/* special computation, use only main domain name, not tld/host
* going back from the end of string, start hashing at first
* dot stop at next.
* This is designed to work with the 'Host' header, and requires
* a special option to activate this.
*/
end = p;
while (len) {
if (dohash) {
/* Rewind the pointer until the previous char
* is a dot, this will allow to set the start
* position of the domain. */
if (*(p - 1) == '.')
break;
}
else if (*p == '.') {
/* The pointer is rewinded to the dot before the
* tld, we memorize the end of the domain and
* can enter the domain processing. */
end = p;
dohash = 1;
}
p--;
len--;
}
start = p;
hash = gen_hash(px, start, (end - start));
}
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
hash = full_hash(hash);
hash_done:
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, hash, avoid);
else
return map_get_server_hash(px, hash);
}
/* RDP Cookie HASH. */
static struct server *get_server_rch(struct stream *s, const struct server *avoid)
{
unsigned int hash = 0;
struct proxy *px = s->be;
unsigned long len;
int ret;
struct sample smp;
int rewind;
/* tot_weight appears to mean srv_count */
if (px->lbprm.tot_weight == 0)
return NULL;
memset(&smp, 0, sizeof(smp));
rewind = co_data(&s->req);
c_rew(&s->req, rewind);
ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
len = smp.data.u.str.data;
c_adv(&s->req, rewind);
if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
return NULL;
/* note: we won't hash if there's only one server left */
if (px->lbprm.tot_used == 1)
goto hash_done;
/* Found the param_name in the headers.
* we will compute the hash based on this value ctx.val.
*/
hash = gen_hash(px, smp.data.u.str.area, len);
if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
hash = full_hash(hash);
hash_done:
if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
return chash_get_server_hash(px, hash, avoid);
else
return map_get_server_hash(px, hash);
}
/* random value */
static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
{
unsigned int hash = 0;
struct proxy *px = s->be;
struct server *prev, *curr;
int draws = px->lbprm.arg_opt1; // number of draws
/* tot_weight appears to mean srv_count */
if (px->lbprm.tot_weight == 0)
return NULL;
curr = NULL;
do {
prev = curr;
/* ensure all 32 bits are covered as long as RAND_MAX >= 65535 */
hash = ((uint64_t)random() * ((uint64_t)RAND_MAX + 1)) ^ random();
curr = chash_get_server_hash(px, hash, avoid);
if (!curr)
break;
/* compare the new server to the previous best choice and pick
* the one with the least currently served requests.
*/
if (prev && prev != curr &&
curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
curr = prev;
} while (--draws > 0);
return curr;
}
/*
* This function applies the load-balancing algorithm to the stream, as
* defined by the backend it is assigned to. The stream is then marked as
* 'assigned'.
*
* This function MAY NOT be called with SF_ASSIGNED already set. If the stream
* had a server previously assigned, it is rebalanced, trying to avoid the same
* server, which should still be present in target_srv(&s->target) before the call.
* The function tries to keep the original connection slot if it reconnects to
* the same server, otherwise it releases it and tries to offer it.
*
* It is illegal to call this function with a stream in a queue.
*
* It may return :
* SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
* SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
* SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
* SRV_STATUS_INTERNAL for other unrecoverable errors.
*
* Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
* it does not need to be called anymore. This means that target_srv(&s->target)
* can be trusted in balance and direct modes.
*
*/
int assign_server(struct stream *s)
{
struct connection *conn = NULL;
struct server *conn_slot;
struct server *srv = NULL, *prev_srv;
int err;
DPRINTF(stderr,"assign_server : s=%p\n",s);
err = SRV_STATUS_INTERNAL;
if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
goto out_err;
prev_srv = objt_server(s->target);
conn_slot = s->srv_conn;
/* We have to release any connection slot before applying any LB algo,
* otherwise we may erroneously end up with no available slot.
*/
if (conn_slot)
sess_change_server(s, NULL);
/* We will now try to find the good server and store it into <objt_server(s->target)>.
* Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
* as well as if no server is available (check error code).
*/
srv = NULL;
s->target = NULL;
if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
((s->sess->flags & SESS_FL_PREFER_LAST) ||
(s->be->options & PR_O_PREF_LAST))) {
struct sess_srv_list *srv_list;
list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
struct server *tmpsrv = objt_server(srv_list->target);
if (tmpsrv && tmpsrv->proxy == s->be &&
((s->sess->flags & SESS_FL_PREFER_LAST) ||
(!s->be->max_ka_queue ||
server_has_room(tmpsrv) || (
tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
srv_currently_usable(tmpsrv)) {
list_for_each_entry(conn, &srv_list->conn_list, session_list) {
if (conn->flags & CO_FL_CONNECTED) {
srv = tmpsrv;
s->target = &srv->obj_type;
goto out_ok;
}
}
}
}
}
if (s->be->lbprm.algo & BE_LB_KIND) {
/* we must check if we have at least one server available */
if (!s->be->lbprm.tot_weight) {
err = SRV_STATUS_NOSRV;
goto out;
}
/* First check whether we need to fetch some data or simply call
* the LB lookup function. Only the hashing functions will need
* some input data in fact, and will support multiple algorithms.
*/
switch (s->be->lbprm.algo & BE_LB_LKUP) {
case BE_LB_LKUP_RRTREE:
srv = fwrr_get_next_server(s->be, prev_srv);
break;
case BE_LB_LKUP_FSTREE:
srv = fas_get_next_server(s->be, prev_srv);
break;
case BE_LB_LKUP_LCTREE:
srv = fwlc_get_next_server(s->be, prev_srv);
break;
case BE_LB_LKUP_CHTREE:
case BE_LB_LKUP_MAP:
if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
srv = get_server_rnd(s, prev_srv);
else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
srv = chash_get_next_server(s->be, prev_srv);
else
srv = map_get_server_rr(s->be, prev_srv);
break;
}
else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
/* unknown balancing algorithm */
err = SRV_STATUS_INTERNAL;
goto out;
}
switch (s->be->lbprm.algo & BE_LB_PARM) {
case BE_LB_HASH_SRC:
conn = objt_conn(strm_orig(s));
if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
srv = get_server_sh(s->be,
(void *)&((struct sockaddr_in *)conn->src)->sin_addr,
4, prev_srv);
}
else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
srv = get_server_sh(s->be,
(void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
16, prev_srv);
}
else {
/* unknown IP family */
err = SRV_STATUS_INTERNAL;
goto out;
}
break;
case BE_LB_HASH_URI:
/* URI hashing */
if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
struct ist uri;
uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
}
break;
case BE_LB_HASH_PRM:
/* URL Parameter hashing */
if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
struct ist uri;
uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
if (!srv && s->txn->meth == HTTP_METH_POST)
srv = get_server_ph_post(s, prev_srv);
}
break;
case BE_LB_HASH_HDR:
/* Header Parameter hashing */
if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
srv = get_server_hh(s, prev_srv);
break;
case BE_LB_HASH_RDP:
/* RDP Cookie hashing */
srv = get_server_rch(s, prev_srv);
break;
default:
/* unknown balancing algorithm */
err = SRV_STATUS_INTERNAL;
goto out;
}
/* If the hashing parameter was not found, let's fall
* back to round robin on the map.
*/
if (!srv) {
if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
srv = chash_get_next_server(s->be, prev_srv);
else
srv = map_get_server_rr(s->be, prev_srv);
}
/* end of map-based LB */
break;
default:
/* unknown balancing algorithm */
err = SRV_STATUS_INTERNAL;
goto out;
}
if (!srv) {
err = SRV_STATUS_FULL;
goto out;
}
else if (srv != prev_srv) {
_HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
_HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
}
s->target = &srv->obj_type;
}
else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
s->target = &s->be->obj_type;
}
else if ((s->be->options & PR_O_HTTP_PROXY)) {
conn = cs_conn(objt_cs(s->si[1].end));
if (conn && conn->dst && is_addr(conn->dst)) {
/* in proxy mode, we need a valid destination address */
s->target = &s->be->obj_type;
} else {
err = SRV_STATUS_NOSRV;
goto out;
}
}
else {
err = SRV_STATUS_NOSRV;
goto out;
}
out_ok:
s->flags |= SF_ASSIGNED;
err = SRV_STATUS_OK;
out:
/* Either we take back our connection slot, or we offer it to someone
* else if we don't need it anymore.
*/
if (conn_slot) {
if (conn_slot == srv) {
sess_change_server(s, srv);
} else {
if (may_dequeue_tasks(conn_slot, s->be))
process_srv_queue(conn_slot);
}
}
out_err:
return err;
}
/*
* This function assigns a server address to a stream, and sets SF_ADDR_SET.
* The address is taken from the currently assigned server, or from the
* dispatch or transparent address.
*
* It may return :
* SRV_STATUS_OK if everything is OK.
* SRV_STATUS_INTERNAL for other unrecoverable errors.
*
* Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
* not cleared, so it's to the caller to clear it if required.
*/
int assign_server_address(struct stream *s)
{
struct connection *cli_conn = objt_conn(strm_orig(s));
DPRINTF(stderr,"assign_server_address : s=%p\n",s);
if (!sockaddr_alloc(&s->target_addr))
return SRV_STATUS_INTERNAL;
if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
/* A server is necessarily known for this stream */
if (!(s->flags & SF_ASSIGNED))
return SRV_STATUS_INTERNAL;
*s->target_addr = __objt_server(s->target)->addr;
set_host_port(s->target_addr, __objt_server(s->target)->svc_port);
if (!is_addr(s->target_addr) && cli_conn) {
/* if the server has no address, we use the same address
* the client asked, which is handy for remapping ports
* locally on multiple addresses at once. Nothing is done
* for AF_UNIX addresses.
*/
if (!conn_get_dst(cli_conn)) {
/* do nothing if we can't retrieve the address */
} else if (cli_conn->dst->ss_family == AF_INET) {
((struct sockaddr_in *)s->target_addr)->sin_addr = ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
} else if (cli_conn->dst->ss_family == AF_INET6) {
((struct sockaddr_in6 *)s->target_addr)->sin6_addr = ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
}
}
/* if this server remaps proxied ports, we'll use
* the port the client connected to with an offset. */
if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
int base_port;
if (conn_get_dst(cli_conn)) {
/* First, retrieve the port from the incoming connection */
base_port = get_host_port(cli_conn->dst);
/* Second, assign the outgoing connection's port */
base_port += get_host_port(s->target_addr);
set_host_port(s->target_addr, base_port);
}
}
}
else if (s->be->options & PR_O_DISPATCH) {
/* connect to the defined dispatch addr */
*s->target_addr = s->be->dispatch_addr;
}
else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
/* in transparent mode, use the original dest addr if no dispatch specified */
if (conn_get_dst(cli_conn) &&
(cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
*s->target_addr = *cli_conn->dst;
}
else if (s->be->options & PR_O_HTTP_PROXY) {
/* If HTTP PROXY option is set, then server is already assigned
* during incoming client request parsing. */
}
else {
/* no server and no LB algorithm ! */
return SRV_STATUS_INTERNAL;
}
s->flags |= SF_ADDR_SET;
return SRV_STATUS_OK;
}
/* This function assigns a server to stream <s> if required, and can add the
* connection to either the assigned server's queue or to the proxy's queue.
* If ->srv_conn is set, the stream is first released from the server.
* It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
* be called before any connection and after any retry or redispatch occurs.
*
* It is not allowed to call this function with a stream in a queue.
*
* Returns :
*
* SRV_STATUS_OK if everything is OK.
* SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
* SRV_STATUS_QUEUED if the connection has been queued.
* SRV_STATUS_FULL if the server(s) is/are saturated and the
* connection could not be queued at the server's,
* which may be NULL if we queue on the backend.
* SRV_STATUS_INTERNAL for other unrecoverable errors.
*
*/
int assign_server_and_queue(struct stream *s)
{
struct pendconn *p;
struct server *srv;
int err;
if (s->pend_pos)
return SRV_STATUS_INTERNAL;
err = SRV_STATUS_OK;
if (!(s->flags & SF_ASSIGNED)) {
struct server *prev_srv = objt_server(s->target);
err = assign_server(s);
if (prev_srv) {
/* This stream was previously assigned to a server. We have to
* update the stream's and the server's stats :
* - if the server changed :
* - set TX_CK_DOWN if txn.flags was TX_CK_VALID
* - set SF_REDISP if it was successfully redispatched
* - increment srv->redispatches and be->redispatches
* - if the server remained the same : update retries.
*/
if (prev_srv != objt_server(s->target)) {
if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
s->txn->flags &= ~TX_CK_MASK;
s->txn->flags |= TX_CK_DOWN;
}
s->flags |= SF_REDISP;
_HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
_HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
} else {
_HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
_HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
}
}
}
switch (err) {
case SRV_STATUS_OK:
/* we have SF_ASSIGNED set */
srv = objt_server(s->target);
if (!srv)
return SRV_STATUS_OK; /* dispatch or proxy mode */
/* If we already have a connection slot, no need to check any queue */
if (s->srv_conn == srv)
return SRV_STATUS_OK;
/* OK, this stream already has an assigned server, but no
* connection slot yet. Either it is a redispatch, or it was
* assigned from persistence information (direct mode).
*/
if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
/* server scheduled for redirection, and already assigned. We
* don't want to go further nor check the queue.
*/
sess_change_server(s, srv); /* not really needed in fact */
return SRV_STATUS_OK;
}
/* We might have to queue this stream if the assigned server is full.
* We know we have to queue it into the server's queue, so if a maxqueue
* is set on the server, we must also check that the server's queue is
* not full, in which case we have to return FULL.
*/
if (srv->maxconn &&
(srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
return SRV_STATUS_FULL;
p = pendconn_add(s);
if (p)
return SRV_STATUS_QUEUED;
else
return SRV_STATUS_INTERNAL;
}
/* OK, we can use this server. Let's reserve our place */
sess_change_server(s, srv);
return SRV_STATUS_OK;
case SRV_STATUS_FULL:
/* queue this stream into the proxy's queue */
p = pendconn_add(s);
if (p)
return SRV_STATUS_QUEUED;
else
return SRV_STATUS_INTERNAL;
case SRV_STATUS_NOSRV:
return err;
case SRV_STATUS_INTERNAL:
return err;
default:
return SRV_STATUS_INTERNAL;
}
}
/* If an explicit source binding is specified on the server and/or backend, and
* this source makes use of the transparent proxy, then it is extracted now and
* assigned to the stream's pending connection. This function assumes that an
* outgoing connection has already been assigned to s->si[1].end.
*/
static void assign_tproxy_address(struct stream *s)
{
#if defined(CONFIG_HAP_TRANSPARENT)
struct server *srv = objt_server(s->target);
struct conn_src *src;
struct connection *cli_conn;
struct connection *srv_conn;
if (objt_cs(s->si[1].end))
srv_conn = cs_conn(__objt_cs(s->si[1].end));
else
srv_conn = objt_conn(s->si[1].end);
if (srv && srv->conn_src.opts & CO_SRC_BIND)
src = &srv->conn_src;
else if (s->be->conn_src.opts & CO_SRC_BIND)
src = &s->be->conn_src;
else
return;
if (!sockaddr_alloc(&srv_conn->src))
return;
switch (src->opts & CO_SRC_TPROXY_MASK) {
case CO_SRC_TPROXY_ADDR:
*srv_conn->src = src->tproxy_addr;
break;
case CO_SRC_TPROXY_CLI:
case CO_SRC_TPROXY_CIP:
/* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
cli_conn = objt_conn(strm_orig(s));
if (cli_conn && conn_get_src(cli_conn))
*srv_conn->src = *cli_conn->src;
else {
sockaddr_free(&srv_conn->src);
}
break;
case CO_SRC_TPROXY_DYN:
if (src->bind_hdr_occ && IS_HTX_STRM(s)) {
char *vptr;
size_t vlen;
/* bind to the IP in a header */
((struct sockaddr_in *)srv_conn->src)->sin_family = AF_INET;
((struct sockaddr_in *)srv_conn->src)->sin_port = 0;
((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr = 0;
if (http_get_htx_hdr(htxbuf(&s->req.buf),
ist2(src->bind_hdr_name, src->bind_hdr_len),
src->bind_hdr_occ, NULL, &vptr, &vlen)) {
((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr =
htonl(inetaddr_host_lim(vptr, vptr + vlen));
}
}
break;
default:
sockaddr_free(&srv_conn->src);
}
#endif
}
#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
/*
* Pick the right mux once the connection is established, we should now have
* an alpn if available, so we are now able to choose. In this specific case
* the connection's context is &si[i].end.
*/
static int conn_complete_server(struct connection *conn)
{
struct conn_stream *cs = NULL;
struct stream *s = container_of(conn->ctx, struct stream, si[1].end);
struct server *srv;
task_wakeup(s->task, TASK_WOKEN_IO);
conn_clear_xprt_done_cb(conn);
/* Verify if the connection just established. */
if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED))))
conn->flags |= CO_FL_CONNECTED;
if (conn->flags & CO_FL_ERROR)
goto fail;
si_detach_endpoint(&s->si[1]);
cs = si_alloc_cs(&s->si[1], conn);
if (!cs)
goto fail;
if (conn_install_mux_be(conn, cs, s->sess) < 0)
goto fail;
srv = objt_server(s->target);
if (srv && ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR) &&
conn->mux->avail_streams(conn) > 0)
LIST_ADD(&srv->idle_conns[tid], &conn->list);
return 0;
fail:
si_detach_endpoint(&s->si[1]);
if (cs)
cs_free(cs);
/* kill the connection now */
conn_stop_tracking(conn);
conn_full_close(conn);
conn_free(conn);
/* Let process_stream know it went wrong */
s->si[1].flags |= SI_FL_ERR;
return -1;
}
#endif
/*
* This function initiates a connection to the server assigned to this stream
* (s->target, s->si[1].addr.to). It will assign a server if none
* is assigned yet.
* It can return one of :
* - SF_ERR_NONE if everything's OK
* - SF_ERR_SRVTO if there are no more servers
* - SF_ERR_SRVCL if the connection was refused by the server
* - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
* - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
* - SF_ERR_INTERNAL for any other purely internal errors
* Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
* The server-facing stream interface is expected to hold a pre-allocated connection
* in s->si[1].conn.
*/
int connect_server(struct stream *s)
{
struct connection *cli_conn = objt_conn(strm_orig(s));
struct connection *srv_conn = NULL;
struct connection *old_conn = NULL;
struct conn_stream *srv_cs = NULL;
struct sess_srv_list *srv_list;
struct server *srv;
int reuse = 0;
int reuse_orphan = 0;
int init_mux = 0;
int alloced_cs = 0;
int err;
/* This will catch some corner cases such as lying connections resulting from
* retries or connect timeouts but will rarely trigger.
*/
si_release_endpoint(&s->si[1]);
/* first, search for a matching connection in the session's idle conns */
list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
if (srv_list->target == s->target) {
list_for_each_entry(srv_conn, &srv_list->conn_list, session_list) {
if (conn_xprt_ready(srv_conn) &&
srv_conn->mux && (srv_conn->mux->avail_streams(srv_conn) > 0)) {
reuse = 1;
break;
}
}
break;
}
}
if (!reuse) {
/* no connection was found in our session's list. Pick any
* random one that we could trade against another one.
*/
srv_conn = NULL;
if (!LIST_ISEMPTY(&s->sess->srv_list)) {
srv_list = LIST_ELEM(s->sess->srv_list.n, struct sess_srv_list *, srv_list);
if (!LIST_ISEMPTY(&srv_list->conn_list))
srv_conn = LIST_ELEM(srv_list->conn_list.n, struct connection *, session_list);
}
}
/* OK at this point we have this :
* - srv_conn points to an existing connection or NULL
* - if reuse is set, srv_conn holds a valid connection, otherwise it
* points to any of our old connections we may want to trade against
* another one
*/
old_conn = srv_conn;
srv = objt_server(s->target);
if (srv && !reuse) {
srv_conn = NULL;
/* Below we pick connections from the safe or idle lists based
* on the strategy, the fact that this is a first or second
* (retryable) request, with the indicated priority (1 or 2) :
*
* SAFE AGGR ALWS
*
* +-----+-----+ +-----+-----+ +-----+-----+
* req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
* ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
* safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
* ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
* idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
* ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
*
* Idle conns are necessarily looked up on the same thread so
* that there is no concurrency issues.
*/
if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
s->txn && (s->txn->flags & TX_NOT_FIRST))) {
srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
}
else if (srv->safe_conns && !LIST_ISEMPTY(&srv->safe_conns[tid]) &&
((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
(s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR)) {
srv_conn = LIST_ELEM(srv->safe_conns[tid].n, struct connection *, list);
}
else if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
(s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) {
srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
} else if (srv->idle_orphan_conns && !LIST_ISEMPTY(&srv->idle_orphan_conns[tid]) &&
(((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) ||
(((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR) &&
s->txn && (s->txn->flags & TX_NOT_FIRST)))) {
srv_conn = LIST_POP_LOCKED(&srv->idle_orphan_conns[tid],
struct connection *, list);
if (srv_conn)
reuse_orphan = 1;
}
/* If we've picked a connection from the pool, we now have to
* detach it. We may have to get rid of the previous idle
* connection we had, so for this we try to swap it with the
* other owner's. That way it may remain alive for others to
* pick.
*/
if (srv_conn)
reuse = 1;
}
/* here reuse might have been set above, indicating srv_conn finally
* is OK.
*/
if (reuse) {
/* Disable connection reuse if a dynamic source is used.
* As long as we don't share connections between servers,
* we don't need to disable connection reuse on no-idempotent
* requests nor when PROXY protocol is used.
*/
if (srv && srv->conn_src.opts & CO_SRC_BIND) {
if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
reuse = 0;
}
else if (s->be->conn_src.opts & CO_SRC_BIND) {
if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
reuse = 0;
}
}
if (((!reuse || (srv_conn && !(srv_conn->flags & CO_FL_CONNECTED)))
&& ha_used_fds > global.tune.pool_high_count) && srv->idle_orphan_conns) {
struct connection *tokill_conn;
/* We can't reuse a connection, and e have more FDs than deemd
* acceptable, attempt to kill an idling connection
*/
/* First, try from our own idle list */
tokill_conn = LIST_POP_LOCKED(&srv->idle_orphan_conns[tid],
struct connection *, list);
if (tokill_conn)
tokill_conn->mux->destroy(tokill_conn->ctx);
/* If not, iterate over other thread's idling pool, and try to grab one */
else {
int i;
for (i = 0; i < global.nbthread; i++) {
if (i == tid)
continue;
// just silence stupid gcc which reports an absurd
// out-of-bounds warning for <i> which is always
// exactly zero without threads, but it seems to
// see it possibly larger.
ALREADY_CHECKED(i);
tokill_conn = LIST_POP_LOCKED(&srv->idle_orphan_conns[i],
struct connection *, list);
if (tokill_conn) {
/* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
LIST_ADDQ_LOCKED(&toremove_connections[i],
&tokill_conn->list);
task_wakeup(idle_conn_cleanup[i], TASK_WOKEN_OTHER);
break;
}
}
}
}
/* If we're really reusing the connection, remove it from the orphan
* list and add it back to the idle list.
*/
if (reuse) {
if (reuse_orphan) {
srv_conn->idle_time = 0;
_HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
__ha_barrier_atomic_store();
srv->curr_idle_thr[tid]--;
LIST_ADDQ(&srv->idle_conns[tid], &srv_conn->list);
}
else {
if (srv_conn->flags & CO_FL_SESS_IDLE) {
struct session *sess = srv_conn->owner;
srv_conn->flags &= ~CO_FL_SESS_IDLE;
sess->idle_conns--;
}
}
}
/* We're about to use another connection, let the mux know we're
* done with this one.
*/
if (old_conn != srv_conn && old_conn && reuse && !reuse_orphan) {
struct session *sess = srv_conn->owner;
if (sess) {
if (old_conn && !(old_conn->flags & CO_FL_PRIVATE) &&
old_conn->mux != NULL) {
if (old_conn->flags & CO_FL_SESS_IDLE)
s->sess->idle_conns--;
session_unown_conn(s->sess, old_conn);
old_conn->owner = sess;
if (!session_add_conn(sess, old_conn, old_conn->target)) {
old_conn->flags &= ~CO_FL_SESS_IDLE;
old_conn->owner = NULL;
old_conn->mux->destroy(old_conn->ctx);
} else
session_check_idle_conn(sess, old_conn);
}
}
}
if (reuse) {
if (srv_conn->mux) {
int avail = srv_conn->mux->avail_streams(srv_conn);
if (avail <= 1) {
/* No more streams available, remove it from the list */
LIST_DEL(&srv_conn->list);
LIST_INIT(&srv_conn->list);
}
if (avail >= 1) {
srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
if (srv_cs) {
alloced_cs = 1;
si_attach_cs(&s->si[1], srv_cs);
} else
srv_conn = NULL;
}
else
srv_conn = NULL;
}
/* otherwise srv_conn is left intact */
}
else
srv_conn = NULL;
/* no reuse or failed to reuse the connection above, pick a new one */
if (!srv_conn) {
srv_conn = conn_new();
if (srv_conn)
srv_conn->target = s->target;
srv_cs = NULL;
}
if (srv_conn && old_conn != srv_conn) {
if (srv_conn->owner)
session_unown_conn(srv_conn->owner, srv_conn);
srv_conn->owner = s->sess;
if (!session_add_conn(s->sess, srv_conn, srv_conn->target)) {
/* If we failed to attach the connection, detach the
* conn_stream, possibly destroying the connection */
if (alloced_cs)
si_release_endpoint(&s->si[1]);
srv_conn->owner = NULL;
if (srv_conn->mux && !srv_add_to_idle_list(objt_server(srv_conn->target), srv_conn))
/* The server doesn't want it, let's kill the connection right away */
srv_conn->mux->destroy(srv_conn->ctx);
srv_conn = NULL;
}
}
if (!srv_conn || !sockaddr_alloc(&srv_conn->dst))
return SF_ERR_RESOURCE;
if (!(s->flags & SF_ADDR_SET)) {
err = assign_server_address(s);
if (err != SRV_STATUS_OK)
return SF_ERR_INTERNAL;
}
/* copy the target address into the connection */
*srv_conn->dst = *s->target_addr;
/* Copy network namespace from client connection */
srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
/* set the correct protocol on the output stream interface */
if (srv)
conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
/* proxies exclusively run on raw_sock right now */
conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
if (!(srv_conn->ctrl))
return SF_ERR_INTERNAL;
}
else
return SF_ERR_INTERNAL; /* how did we get there ? */
#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
if (!srv ||
((!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
srv->mux_proto || s->be->mode != PR_MODE_HTTP))
#endif
{
srv_cs = objt_cs(s->si[1].end);
if (!srv_cs || srv_cs->conn != srv_conn)
srv_cs = si_alloc_cs(&s->si[1], srv_conn);
if (!srv_cs) {
conn_free(srv_conn);
return SF_ERR_RESOURCE;
}
init_mux = 1;
}
#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
else {
srv_conn->ctx = &s->si[1].end;
/* Store the connection into the stream interface,
* while we still don't have a mux, so that if the
* stream is destroyed before the connection is
* established, we have a chance to destroy it even
* if it is no longer referenced in the session.
*/
s->si[1].end = &srv_conn->obj_type;
conn_set_xprt_done_cb(srv_conn, conn_complete_server);
}
#endif
/* process the case where the server requires the PROXY protocol to be sent */
srv_conn->send_proxy_ofs = 0;
if (srv && srv->pp_opts) {
srv_conn->flags |= CO_FL_PRIVATE;
srv_conn->flags |= CO_FL_SEND_PROXY;
srv_conn->send_proxy_ofs = 1; /* must compute size */
if (cli_conn)
conn_get_dst(cli_conn);
}
assign_tproxy_address(s);
if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
srv_conn->send_proxy_ofs = 1;
srv_conn->flags |= CO_FL_SOCKS4;
}
}
else if (!conn_xprt_ready(srv_conn)) {
if (srv_conn->mux->reset)
srv_conn->mux->reset(srv_conn);
}
else
s->flags |= SF_SRV_REUSED;
/* flag for logging source ip/port */
if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
s->si[1].flags |= SI_FL_SRC_ADDR;
/* disable lingering */
if (s->be->options & PR_O_TCP_NOLING)
s->si[1].flags |= SI_FL_NOLINGER;
if (s->flags & SF_SRV_REUSED) {
_HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
if (srv)
_HA_ATOMIC_ADD(&srv->counters.reuse, 1);
} else {
_HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
if (srv)
_HA_ATOMIC_ADD(&srv->counters.connect, 1);
}
err = si_connect(&s->si[1], srv_conn);
if (err != SF_ERR_NONE)
return err;
/* We have to defer the mux initialization until after si_connect()
* has been called, as we need the xprt to have been properly
* initialized, or any attempt to recv during the mux init may
* fail, and flag the connection as CO_FL_ERROR.
*/
if (init_mux) {
if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
conn_full_close(srv_conn);
return SF_ERR_INTERNAL;
}
/* If we're doing http-reuse always, and the connection
* is an http2 connection, add it to the available list,
* so that others can use it right away.
*/
if (srv && ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
srv_conn->mux->avail_streams(srv_conn) > 0)
LIST_ADD(&srv->idle_conns[tid], &srv_conn->list);
}
/* The CO_FL_SEND_PROXY flag may have been set by the connect method,
* if so, add our handshake pseudo-XPRT now.
*/
if ((srv_conn->flags & CO_FL_HANDSHAKE_NOSSL)) {
if (xprt_add_hs(srv_conn) < 0) {
conn_full_close(srv_conn);
return SF_ERR_INTERNAL;
}
}
#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
if (!reuse && cli_conn && srv && srv_conn->mux &&
(srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
/* Only attempt to use early data if either the client sent
* early data, so that we know it can handle a 425, or if
* we are allwoed to retry requests on early data failure, and
* it's our first try
*/
((cli_conn->flags & CO_FL_EARLY_DATA) ||
((s->be->retry_type & PR_RE_EARLY_ERROR) &&
s->si[1].conn_retries == s->be->conn_retries)) &&
!channel_is_empty(si_oc(&s->si[1])) &&
srv_conn->flags & CO_FL_SSL_WAIT_HS)
srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
#endif
/* set connect timeout */
s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
if (srv) {
int count;
s->flags |= SF_CURR_SESS;
count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
if (s->be->lbprm.server_take_conn)
s->be->lbprm.server_take_conn(srv);
#ifdef USE_OPENSSL
if (srv->ssl_ctx.sni) {
struct sample *smp;
smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
srv->ssl_ctx.sni, SMP_T_STR);
if (smp_make_safe(smp)) {
ssl_sock_set_servername(srv_conn,
smp->data.u.str.area);
srv_conn->flags |= CO_FL_PRIVATE;
}
}
#endif /* USE_OPENSSL */
}
return SF_ERR_NONE; /* connection is OK */
}
/* This function performs the "redispatch" part of a connection attempt. It
* will assign a server if required, queue the connection if required, and
* handle errors that might arise at this level. It can change the server
* state. It will return 1 if it encounters an error, switches the server
* state, or has to queue a connection. Otherwise, it will return 0 indicating
* that the connection is ready to use.
*/
int srv_redispatch_connect(struct stream *s)
{
struct server *srv;
int conn_err;
/* We know that we don't have any connection pending, so we will
* try to get a new one, and wait in this state if it's queued
*/
redispatch:
conn_err = assign_server_and_queue(s);
srv = objt_server(s->target);
switch (conn_err) {
case SRV_STATUS_OK:
break;
case SRV_STATUS_FULL:
/* The server has reached its maxqueue limit. Either PR_O_REDISP is set
* and we can redispatch to another server, or it is not and we return
* 503. This only makes sense in DIRECT mode however, because normal LB
* algorithms would never select such a server, and hash algorithms
* would bring us on the same server again. Note that s->target is set
* in this case.
*/
if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
(s->be->options & PR_O_REDISP)) {
s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
sockaddr_free(&s->target_addr);
goto redispatch;
}
if (!s->si[1].err_type) {
s->si[1].err_type = SI_ET_QUEUE_ERR;
}
_HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
_HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
return 1;
case SRV_STATUS_NOSRV:
/* note: it is guaranteed that srv == NULL here */
if (!s->si[1].err_type) {
s->si[1].err_type = SI_ET_CONN_ERR;
}
_HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
return 1;
case SRV_STATUS_QUEUED:
s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
s->si[1].state = SI_ST_QUE;
/* do nothing else and do not wake any other stream up */
return 1;
case SRV_STATUS_INTERNAL:
default:
if (!s->si[1].err_type) {
s->si[1].err_type = SI_ET_CONN_OTHER;
}
if (srv)
srv_inc_sess_ctr(srv);
if (srv)
srv_set_sess_last(srv);
if (srv)
_HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
_HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
/* release other streams waiting for this server */
if (may_dequeue_tasks(srv, s->be))
process_srv_queue(srv);
return 1;
}
/* if we get here, it's because we got SRV_STATUS_OK, which also
* means that the connection has not been queued.
*/
return 0;
}
/* sends a log message when a backend goes down, and also sets last
* change date.
*/
void set_backend_down(struct proxy *be)
{
be->last_change = now.tv_sec;
_HA_ATOMIC_ADD(&be->down_trans, 1);
if (!(global.mode & MODE_STARTING)) {
ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
}
}
/* Apply RDP cookie persistence to the current stream. For this, the function
* tries to extract an RDP cookie from the request buffer, and look for the
* matching server in the list. If the server is found, it is assigned to the
* stream. This always returns 1, and the analyser removes itself from the
* list. Nothing is performed if a server was already assigned.
*/
int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
{
struct proxy *px = s->be;
int ret;
struct sample smp;
struct server *srv = px->srv;
uint16_t port;
uint32_t addr;
char *p;
DPRINTF(stderr,"[%u] %s: stream=%p b=%p, exp(r,w)=%u,%u bf=%08x bh=%lu analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
ci_data(req),
req->analysers);
if (s->flags & SF_ASSIGNED)
goto no_cookie;
memset(&smp, 0, sizeof(smp));
ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
goto no_cookie;
/* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
* The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
* server's IP address in network order, and "port" is the integer corresponding to the
* server's port in network order. Comments please Emeric.
*/
addr = strtoul(smp.data.u.str.area, &p, 10);
if (*p != '.')
goto no_cookie;
p++;
port = ntohs(strtoul(p, &p, 10));
if (*p != '.')
goto no_cookie;
s->target = NULL;
while (srv) {
if (srv->addr.ss_family == AF_INET &&
port == srv->svc_port &&
addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
/* we found the server and it is usable */
s->flags |= SF_DIRECT | SF_ASSIGNED;
s->target = &srv->obj_type;
break;
}
}
srv = srv->next;
}
no_cookie:
req->analysers &= ~an_bit;
req->analyse_exp = TICK_ETERNITY;
return 1;
}
int be_downtime(struct proxy *px) {
if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
return px->down_time;
return now.tv_sec - px->last_change + px->down_time;
}
/*
* This function returns a string containing the balancing
* mode of the proxy in a format suitable for stats.
*/
const char *backend_lb_algo_str(int algo) {
if (algo == BE_LB_ALGO_RR)
return "roundrobin";
else if (algo == BE_LB_ALGO_SRR)
return "static-rr";
else if (algo == BE_LB_ALGO_FAS)
return "first";
else if (algo == BE_LB_ALGO_LC)
return "leastconn";
else if (algo == BE_LB_ALGO_SH)
return "source";
else if (algo == BE_LB_ALGO_UH)
return "uri";
else if (algo == BE_LB_ALGO_PH)
return "url_param";
else if (algo == BE_LB_ALGO_HH)
return "hdr";
else if (algo == BE_LB_ALGO_RCH)
return "rdp-cookie";
else if (algo == BE_LB_ALGO_NONE)
return "none";
else
return "unknown";
}
/* This function parses a "balance" statement in a backend section describing
* <curproxy>. It returns -1 if there is any error, otherwise zero. If it
* returns -1, it will write an error message into the <err> buffer which will
* automatically be allocated and must be passed as NULL. The trailing '\n'
* will not be written. The function must be called with <args> pointing to the
* first word after "balance".
*/
int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
{
if (!*(args[0])) {
/* if no option is set, use round-robin by default */
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_RR;
return 0;
}
if (!strcmp(args[0], "roundrobin")) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_RR;
}
else if (!strcmp(args[0], "static-rr")) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
}
else if (!strcmp(args[0], "first")) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
}
else if (!strcmp(args[0], "leastconn")) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_LC;
}
else if (!strncmp(args[0], "random", 6)) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_RND;
curproxy->lbprm.arg_opt1 = 2;
if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
const char *beg;
char *end;
beg = args[0] + 7;
curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
if (*end != ')') {
if (!*end)
memprintf(err, "random : missing closing parenthesis.");
else
memprintf(err, "random : unexpected character '%c' after argument.", *end);
return -1;
}
if (curproxy->lbprm.arg_opt1 < 1) {
memprintf(err, "random : number of draws must be at least 1.");
return -1;
}
}
}
else if (!strcmp(args[0], "source")) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_SH;
}
else if (!strcmp(args[0], "uri")) {
int arg = 1;
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_UH;
curproxy->lbprm.arg_opt1 = 0; // "whole"
curproxy->lbprm.arg_opt2 = 0; // "len"
curproxy->lbprm.arg_opt3 = 0; // "depth"
while (*args[arg]) {
if (!strcmp(args[arg], "len")) {
if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
return -1;
}
curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
arg += 2;
}
else if (!strcmp(args[arg], "depth")) {
if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
return -1;
}
/* hint: we store the position of the ending '/' (depth+1) so
* that we avoid a comparison while computing the hash.
*/
curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
arg += 2;
}
else if (!strcmp(args[arg], "whole")) {
curproxy->lbprm.arg_opt1 = 1;
arg += 1;
}
else {
memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
return -1;
}
}
}
else if (!strcmp(args[0], "url_param")) {
if (!*args[1]) {
memprintf(err, "%s requires an URL parameter name.", args[0]);
return -1;
}
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_PH;
free(curproxy->lbprm.arg_str);
curproxy->lbprm.arg_str = strdup(args[1]);
curproxy->lbprm.arg_len = strlen(args[1]);
if (*args[2]) {
if (strcmp(args[2], "check_post")) {
memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
return -1;
}
}
}
else if (!strncmp(args[0], "hdr(", 4)) {
const char *beg, *end;
beg = args[0] + 4;
end = strchr(beg, ')');
if (!end || end == beg) {
memprintf(err, "hdr requires an http header field name.");
return -1;
}
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_HH;
free(curproxy->lbprm.arg_str);
curproxy->lbprm.arg_len = end - beg;
curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
curproxy->lbprm.arg_opt1 = 0;
if (*args[1]) {
if (strcmp(args[1], "use_domain_only")) {
memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
return -1;
}
curproxy->lbprm.arg_opt1 = 1;
}
}
else if (!strncmp(args[0], "rdp-cookie", 10)) {
curproxy->lbprm.algo &= ~BE_LB_ALGO;
curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
const char *beg, *end;
beg = args[0] + 11;
end = strchr(beg, ')');
if (!end || end == beg) {
memprintf(err, "rdp-cookie : missing cookie name.");
return -1;
}
free(curproxy->lbprm.arg_str);
curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
curproxy->lbprm.arg_len = end - beg;
}
else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
free(curproxy->lbprm.arg_str);
curproxy->lbprm.arg_str = strdup("mstshash");
curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
}
else { /* syntax */
memprintf(err, "rdp-cookie : missing cookie name.");
return -1;
}
}
else {
memprintf(err, "only supports 'roundrobin', 'static-rr', 'leastconn', 'source', 'uri', 'url_param', 'hdr(name)' and 'rdp-cookie(name)' options.");
return -1;
}
return 0;
}
/************************************************************************/
/* All supported sample and ACL keywords must be declared here. */
/************************************************************************/
/* set temp integer to the number of enabled servers on the proxy.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
struct proxy *px;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
px = args->data.prx;
smp->data.u.sint = be_usable_srv(px);
return 1;
}
/* report in smp->flags a success or failure depending on the designated
* server's state. There is no match function involved since there's no pattern.
* Accepts exactly 1 argument. Argument is a server, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
struct server *srv = args->data.srv;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_BOOL;
if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
(!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
smp->data.u.sint = 1;
else
smp->data.u.sint = 0;
return 1;
}
/* set temp integer to the number of enabled servers on the proxy.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
struct server *iterator;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = 0;
for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
if (iterator->cur_state == SRV_ST_STOPPED)
continue;
if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
/* configuration is stupid */
smp->data.u.sint = -1; /* FIXME: stupid value! */
return 1;
}
smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
+ (iterator->maxqueue - iterator->nbpend);
}
return 1;
}
/* set temp integer to the id of the backend */
static int
smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->strm)
return 0;
smp->flags = SMP_F_VOL_TXN;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = smp->strm->be->uuid;
return 1;
}
/* set string to the name of the backend */
static int
smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->strm)
return 0;
smp->data.u.str.area = (char *)smp->strm->be->id;
if (!smp->data.u.str.area)
return 0;
smp->data.type = SMP_T_STR;
smp->flags = SMP_F_CONST;
smp->data.u.str.data = strlen(smp->data.u.str.area);
return 1;
}
/* set temp integer to the id of the server */
static int
smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
if (!smp->strm)
return 0;
if (!objt_server(smp->strm->target))
return 0;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = __objt_server(smp->strm->target)->puid;
return 1;
}
/* set temp integer to the number of connections per second reaching the backend.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
return 1;
}
/* set temp integer to the number of concurrent connections on the backend.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = args->data.prx->beconn;
return 1;
}
/* set temp integer to the number of available connections across available
* servers on the backend.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
struct server *iterator;
struct proxy *px;
unsigned int maxconn;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = 0;
for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
if (iterator->cur_state == SRV_ST_STOPPED)
continue;
px = iterator->proxy;
if (!srv_currently_usable(iterator) ||
((iterator->flags & SRV_F_BACKUP) &&
(px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
continue;
if (iterator->maxconn == 0) {
/* one active server is unlimited, return -1 */
smp->data.u.sint = -1;
return 1;
}
maxconn = srv_dynamic_maxconn(iterator);
if (maxconn > iterator->cur_sess)
smp->data.u.sint += maxconn - iterator->cur_sess;
}
return 1;
}
/* set temp integer to the total number of queued connections on the backend.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = args->data.prx->totpend;
return 1;
}
/* set temp integer to the total number of queued connections on the backend divided
* by the number of running servers and rounded up. If there is no running
* server, we return twice the total, just as if we had half a running server.
* This is more or less correct anyway, since we expect the last server to come
* back soon.
* Accepts exactly 1 argument. Argument is a backend, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
int nbsrv;
struct proxy *px;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
px = args->data.prx;
nbsrv = be_usable_srv(px);
if (nbsrv > 0)
smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
else
smp->data.u.sint = px->totpend * 2;
return 1;
}
/* set temp integer to the number of concurrent connections on the server in the backend.
* Accepts exactly 1 argument. Argument is a server, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = args->data.srv->cur_sess;
return 1;
}
/* set temp integer to the number of available connections on the server in the backend.
* Accepts exactly 1 argument. Argument is a server, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
unsigned int maxconn;
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
if (args->data.srv->maxconn == 0) {
/* one active server is unlimited, return -1 */
smp->data.u.sint = -1;
return 1;
}
maxconn = srv_dynamic_maxconn(args->data.srv);
if (maxconn > args->data.srv->cur_sess)
smp->data.u.sint = maxconn - args->data.srv->cur_sess;
else
smp->data.u.sint = 0;
return 1;
}
/* set temp integer to the number of connections pending in the server's queue.
* Accepts exactly 1 argument. Argument is a server, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = args->data.srv->nbpend;
return 1;
}
/* set temp integer to the number of enabled servers on the proxy.
* Accepts exactly 1 argument. Argument is a server, other types will lead to
* undefined behaviour.
*/
static int
smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
smp->flags = SMP_F_VOL_TEST;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
return 1;
}
static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
{
struct proxy *px;
if (!smp_make_safe(smp))
return 0;
px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
if (!px)
return 0;
smp->data.type = SMP_T_SINT;
smp->data.u.sint = be_usable_srv(px);
return 1;
}
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct sample_fetch_kw_list smp_kws = {ILH, {
{ "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
{ "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
{ "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
{ "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
{ "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
{ /* END */ },
}};
INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_conv_kw_list sample_conv_kws = {ILH, {
{ "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
{ /* END */ },
}};
INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted.
*/
static struct acl_kw_list acl_kws = {ILH, {
{ /* END */ },
}};
INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
Reference in New Issue View Git Blame Copy Permalink