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git01.mediatek.com / haproxy / 97880bb46d592e4bd184bffe4c9a71c5f549aff2 / . / src / server.c
blob: 5a2c58a8f2d410605b5a4ba11deb7cab4bc749c3 [file] [log] [blame]
/*
* Server management functions.
*
* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
* Copyright 2007-2008 Krzysztof Piotr Oledzki <ole@ans.pl>
*
* 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 <ctype.h>
#include <errno.h>
#include <common/cfgparse.h>
#include <common/config.h>
#include <common/errors.h>
#include <common/namespace.h>
#include <common/time.h>
#include <types/global.h>
#include <types/dns.h>
#include <proto/checks.h>
#include <proto/port_range.h>
#include <proto/protocol.h>
#include <proto/queue.h>
#include <proto/raw_sock.h>
#include <proto/server.h>
#include <proto/stream.h>
#include <proto/task.h>
#include <proto/dns.h>
static void srv_update_state(struct server *srv, int version, char **params);
/* List head of all known server keywords */
static struct srv_kw_list srv_keywords = {
.list = LIST_HEAD_INIT(srv_keywords.list)
};
int srv_downtime(const struct server *s)
{
if ((s->state != SRV_ST_STOPPED) && s->last_change < now.tv_sec) // ignore negative time
return s->down_time;
return now.tv_sec - s->last_change + s->down_time;
}
int srv_lastsession(const struct server *s)
{
if (s->counters.last_sess)
return now.tv_sec - s->counters.last_sess;
return -1;
}
int srv_getinter(const struct check *check)
{
const struct server *s = check->server;
if ((check->state & CHK_ST_CONFIGURED) && (check->health == check->rise + check->fall - 1))
return check->inter;
if ((s->state == SRV_ST_STOPPED) && check->health == 0)
return (check->downinter)?(check->downinter):(check->inter);
return (check->fastinter)?(check->fastinter):(check->inter);
}
/*
* Registers the server keyword list <kwl> as a list of valid keywords for next
* parsing sessions.
*/
void srv_register_keywords(struct srv_kw_list *kwl)
{
LIST_ADDQ(&srv_keywords.list, &kwl->list);
}
/* Return a pointer to the server keyword <kw>, or NULL if not found. If the
* keyword is found with a NULL ->parse() function, then an attempt is made to
* find one with a valid ->parse() function. This way it is possible to declare
* platform-dependant, known keywords as NULL, then only declare them as valid
* if some options are met. Note that if the requested keyword contains an
* opening parenthesis, everything from this point is ignored.
*/
struct srv_kw *srv_find_kw(const char *kw)
{
int index;
const char *kwend;
struct srv_kw_list *kwl;
struct srv_kw *ret = NULL;
kwend = strchr(kw, '(');
if (!kwend)
kwend = kw + strlen(kw);
list_for_each_entry(kwl, &srv_keywords.list, list) {
for (index = 0; kwl->kw[index].kw != NULL; index++) {
if ((strncmp(kwl->kw[index].kw, kw, kwend - kw) == 0) &&
kwl->kw[index].kw[kwend-kw] == 0) {
if (kwl->kw[index].parse)
return &kwl->kw[index]; /* found it !*/
else
ret = &kwl->kw[index]; /* may be OK */
}
}
}
return ret;
}
/* Dumps all registered "server" keywords to the <out> string pointer. The
* unsupported keywords are only dumped if their supported form was not
* found.
*/
void srv_dump_kws(char **out)
{
struct srv_kw_list *kwl;
int index;
*out = NULL;
list_for_each_entry(kwl, &srv_keywords.list, list) {
for (index = 0; kwl->kw[index].kw != NULL; index++) {
if (kwl->kw[index].parse ||
srv_find_kw(kwl->kw[index].kw) == &kwl->kw[index]) {
memprintf(out, "%s[%4s] %s%s%s%s\n", *out ? *out : "",
kwl->scope,
kwl->kw[index].kw,
kwl->kw[index].skip ? " <arg>" : "",
kwl->kw[index].default_ok ? " [dflt_ok]" : "",
kwl->kw[index].parse ? "" : " (not supported)");
}
}
}
}
/* parse the "id" server keyword */
static int srv_parse_id(char **args, int *cur_arg, struct proxy *curproxy, struct server *newsrv, char **err)
{
struct eb32_node *node;
if (!*args[*cur_arg + 1]) {
memprintf(err, "'%s' : expects an integer argument", args[*cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
newsrv->puid = atol(args[*cur_arg + 1]);
newsrv->conf.id.key = newsrv->puid;
if (newsrv->puid <= 0) {
memprintf(err, "'%s' : custom id has to be > 0", args[*cur_arg]);
return ERR_ALERT | ERR_FATAL;
}
node = eb32_lookup(&curproxy->conf.used_server_id, newsrv->puid);
if (node) {
struct server *target = container_of(node, struct server, conf.id);
memprintf(err, "'%s' : custom id %d already used at %s:%d ('server %s')",
args[*cur_arg], newsrv->puid, target->conf.file, target->conf.line,
target->id);
return ERR_ALERT | ERR_FATAL;
}
eb32_insert(&curproxy->conf.used_server_id, &newsrv->conf.id);
newsrv->flags |= SRV_F_FORCED_ID;
return 0;
}
/* Shutdown all connections of a server. The caller must pass a termination
* code in <why>, which must be one of SF_ERR_* indicating the reason for the
* shutdown.
*/
void srv_shutdown_streams(struct server *srv, int why)
{
struct stream *stream, *stream_bck;
list_for_each_entry_safe(stream, stream_bck, &srv->actconns, by_srv)
if (stream->srv_conn == srv)
stream_shutdown(stream, why);
}
/* Shutdown all connections of all backup servers of a proxy. The caller must
* pass a termination code in <why>, which must be one of SF_ERR_* indicating
* the reason for the shutdown.
*/
void srv_shutdown_backup_streams(struct proxy *px, int why)
{
struct server *srv;
for (srv = px->srv; srv != NULL; srv = srv->next)
if (srv->flags & SRV_F_BACKUP)
srv_shutdown_streams(srv, why);
}
/* Appends some information to a message string related to a server going UP or
* DOWN. If both <forced> and <reason> are null and the server tracks another
* one, a "via" information will be provided to know where the status came from.
* If <reason> is non-null, the entire string will be appended after a comma and
* a space (eg: to report some information from the check that changed the state).
* If <xferred> is non-negative, some information about requeued streams are
* provided.
*/
void srv_append_status(struct chunk *msg, struct server *s, const char *reason, int xferred, int forced)
{
if (reason)
chunk_appendf(msg, ", %s", reason);
else if (!forced && s->track)
chunk_appendf(msg, " via %s/%s", s->track->proxy->id, s->track->id);
if (xferred >= 0) {
if (s->state == SRV_ST_STOPPED)
chunk_appendf(msg, ". %d active and %d backup servers left.%s"
" %d sessions active, %d requeued, %d remaining in queue",
s->proxy->srv_act, s->proxy->srv_bck,
(s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "",
s->cur_sess, xferred, s->nbpend);
else
chunk_appendf(msg, ". %d active and %d backup servers online.%s"
" %d sessions requeued, %d total in queue",
s->proxy->srv_act, s->proxy->srv_bck,
(s->proxy->srv_bck && !s->proxy->srv_act) ? " Running on backup." : "",
xferred, s->nbpend);
}
}
/* Marks server <s> down, regardless of its checks' statuses, notifies by all
* available means, recounts the remaining servers on the proxy and transfers
* queued streams whenever possible to other servers. It automatically
* recomputes the number of servers, but not the map. Maintenance servers are
* ignored. It reports <reason> if non-null as the reason for going down. Note
* that it makes use of the trash to build the log strings, so <reason> must
* not be placed there.
*/
void srv_set_stopped(struct server *s, const char *reason)
{
struct server *srv;
int prev_srv_count = s->proxy->srv_bck + s->proxy->srv_act;
int srv_was_stopping = (s->state == SRV_ST_STOPPING);
int log_level;
int xferred;
if ((s->admin & SRV_ADMF_MAINT) || s->state == SRV_ST_STOPPED)
return;
s->last_change = now.tv_sec;
s->state = SRV_ST_STOPPED;
if (s->proxy->lbprm.set_server_status_down)
s->proxy->lbprm.set_server_status_down(s);
if (s->onmarkeddown & HANA_ONMARKEDDOWN_SHUTDOWNSESSIONS)
srv_shutdown_streams(s, SF_ERR_DOWN);
/* we might have streams queued on this server and waiting for
* a connection. Those which are redispatchable will be queued
* to another server or to the proxy itself.
*/
xferred = pendconn_redistribute(s);
chunk_printf(&trash,
"%sServer %s/%s is DOWN", s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
srv_append_status(&trash, s, reason, xferred, 0);
Warning("%s.\n", trash.str);
/* we don't send an alert if the server was previously paused */
log_level = srv_was_stopping ? LOG_NOTICE : LOG_ALERT;
send_log(s->proxy, log_level, "%s.\n", trash.str);
send_email_alert(s, log_level, "%s", trash.str);
if (prev_srv_count && s->proxy->srv_bck == 0 && s->proxy->srv_act == 0)
set_backend_down(s->proxy);
s->counters.down_trans++;
for (srv = s->trackers; srv; srv = srv->tracknext)
srv_set_stopped(srv, NULL);
}
/* Marks server <s> up regardless of its checks' statuses and provided it isn't
* in maintenance. Notifies by all available means, recounts the remaining
* servers on the proxy and tries to grab requests from the proxy. It
* automatically recomputes the number of servers, but not the map. Maintenance
* servers are ignored. It reports <reason> if non-null as the reason for going
* up. Note that it makes use of the trash to build the log strings, so <reason>
* must not be placed there.
*/
void srv_set_running(struct server *s, const char *reason)
{
struct server *srv;
int xferred;
if (s->admin & SRV_ADMF_MAINT)
return;
if (s->state == SRV_ST_STARTING || s->state == SRV_ST_RUNNING)
return;
if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
if (s->proxy->last_change < now.tv_sec) // ignore negative times
s->proxy->down_time += now.tv_sec - s->proxy->last_change;
s->proxy->last_change = now.tv_sec;
}
if (s->state == SRV_ST_STOPPED && s->last_change < now.tv_sec) // ignore negative times
s->down_time += now.tv_sec - s->last_change;
s->last_change = now.tv_sec;
s->state = SRV_ST_STARTING;
if (s->slowstart > 0)
task_schedule(s->warmup, tick_add(now_ms, MS_TO_TICKS(MAX(1000, s->slowstart / 20))));
else
s->state = SRV_ST_RUNNING;
server_recalc_eweight(s);
/* If the server is set with "on-marked-up shutdown-backup-sessions",
* and it's not a backup server and its effective weight is > 0,
* then it can accept new connections, so we shut down all streams
* on all backup servers.
*/
if ((s->onmarkedup & HANA_ONMARKEDUP_SHUTDOWNBACKUPSESSIONS) &&
!(s->flags & SRV_F_BACKUP) && s->eweight)
srv_shutdown_backup_streams(s->proxy, SF_ERR_UP);
/* check if we can handle some connections queued at the proxy. We
* will take as many as we can handle.
*/
xferred = pendconn_grab_from_px(s);
chunk_printf(&trash,
"%sServer %s/%s is UP", s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
srv_append_status(&trash, s, reason, xferred, 0);
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
send_email_alert(s, LOG_NOTICE, "%s", trash.str);
for (srv = s->trackers; srv; srv = srv->tracknext)
srv_set_running(srv, NULL);
}
/* Marks server <s> stopping regardless of its checks' statuses and provided it
* isn't in maintenance. Notifies by all available means, recounts the remaining
* servers on the proxy and tries to grab requests from the proxy. It
* automatically recomputes the number of servers, but not the map. Maintenance
* servers are ignored. It reports <reason> if non-null as the reason for going
* up. Note that it makes use of the trash to build the log strings, so <reason>
* must not be placed there.
*/
void srv_set_stopping(struct server *s, const char *reason)
{
struct server *srv;
int xferred;
if (s->admin & SRV_ADMF_MAINT)
return;
if (s->state == SRV_ST_STOPPING)
return;
s->last_change = now.tv_sec;
s->state = SRV_ST_STOPPING;
if (s->proxy->lbprm.set_server_status_down)
s->proxy->lbprm.set_server_status_down(s);
/* we might have streams queued on this server and waiting for
* a connection. Those which are redispatchable will be queued
* to another server or to the proxy itself.
*/
xferred = pendconn_redistribute(s);
chunk_printf(&trash,
"%sServer %s/%s is stopping", s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
srv_append_status(&trash, s, reason, xferred, 0);
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
if (!s->proxy->srv_bck && !s->proxy->srv_act)
set_backend_down(s->proxy);
for (srv = s->trackers; srv; srv = srv->tracknext)
srv_set_stopping(srv, NULL);
}
/* Enables admin flag <mode> (among SRV_ADMF_*) on server <s>. This is used to
* enforce either maint mode or drain mode. It is not allowed to set more than
* one flag at once. The equivalent "inherited" flag is propagated to all
* tracking servers. Maintenance mode disables health checks (but not agent
* checks). When either the flag is already set or no flag is passed, nothing
* is done.
*/
void srv_set_admin_flag(struct server *s, enum srv_admin mode)
{
struct check *check = &s->check;
struct server *srv;
int xferred;
if (!mode)
return;
/* stop going down as soon as we meet a server already in the same state */
if (s->admin & mode)
return;
s->admin |= mode;
/* stop going down if the equivalent flag was already present (forced or inherited) */
if (((mode & SRV_ADMF_MAINT) && (s->admin & ~mode & SRV_ADMF_MAINT)) ||
((mode & SRV_ADMF_DRAIN) && (s->admin & ~mode & SRV_ADMF_DRAIN)))
return;
/* Maintenance must also disable health checks */
if (mode & SRV_ADMF_MAINT) {
if (s->check.state & CHK_ST_ENABLED) {
s->check.state |= CHK_ST_PAUSED;
check->health = 0;
}
if (s->state == SRV_ST_STOPPED) { /* server was already down */
chunk_printf(&trash,
"%sServer %s/%s was DOWN and now enters maintenance",
s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id);
srv_append_status(&trash, s, NULL, -1, (mode & SRV_ADMF_FMAINT));
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
else { /* server was still running */
int srv_was_stopping = (s->state == SRV_ST_STOPPING) || (s->admin & SRV_ADMF_DRAIN);
int prev_srv_count = s->proxy->srv_bck + s->proxy->srv_act;
check->health = 0; /* failure */
s->last_change = now.tv_sec;
s->state = SRV_ST_STOPPED;
if (s->proxy->lbprm.set_server_status_down)
s->proxy->lbprm.set_server_status_down(s);
if (s->onmarkeddown & HANA_ONMARKEDDOWN_SHUTDOWNSESSIONS)
srv_shutdown_streams(s, SF_ERR_DOWN);
/* we might have streams queued on this server and waiting for
* a connection. Those which are redispatchable will be queued
* to another server or to the proxy itself.
*/
xferred = pendconn_redistribute(s);
chunk_printf(&trash,
"%sServer %s/%s is going DOWN for maintenance",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
srv_append_status(&trash, s, NULL, xferred, (mode & SRV_ADMF_FMAINT));
Warning("%s.\n", trash.str);
send_log(s->proxy, srv_was_stopping ? LOG_NOTICE : LOG_ALERT, "%s.\n", trash.str);
if (prev_srv_count && s->proxy->srv_bck == 0 && s->proxy->srv_act == 0)
set_backend_down(s->proxy);
s->counters.down_trans++;
}
}
/* drain state is applied only if not yet in maint */
if ((mode & SRV_ADMF_DRAIN) && !(s->admin & SRV_ADMF_MAINT)) {
int prev_srv_count = s->proxy->srv_bck + s->proxy->srv_act;
s->last_change = now.tv_sec;
if (s->proxy->lbprm.set_server_status_down)
s->proxy->lbprm.set_server_status_down(s);
/* we might have streams queued on this server and waiting for
* a connection. Those which are redispatchable will be queued
* to another server or to the proxy itself.
*/
xferred = pendconn_redistribute(s);
chunk_printf(&trash, "%sServer %s/%s enters drain state",
s->flags & SRV_F_BACKUP ? "Backup " : "", s->proxy->id, s->id);
srv_append_status(&trash, s, NULL, xferred, (mode & SRV_ADMF_FDRAIN));
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
send_email_alert(s, LOG_NOTICE, "%s", trash.str);
if (prev_srv_count && s->proxy->srv_bck == 0 && s->proxy->srv_act == 0)
set_backend_down(s->proxy);
}
/* compute the inherited flag to propagate */
if (mode & SRV_ADMF_MAINT)
mode = SRV_ADMF_IMAINT;
else if (mode & SRV_ADMF_DRAIN)
mode = SRV_ADMF_IDRAIN;
for (srv = s->trackers; srv; srv = srv->tracknext)
srv_set_admin_flag(srv, mode);
}
/* Disables admin flag <mode> (among SRV_ADMF_*) on server <s>. This is used to
* stop enforcing either maint mode or drain mode. It is not allowed to set more
* than one flag at once. The equivalent "inherited" flag is propagated to all
* tracking servers. Leaving maintenance mode re-enables health checks. When
* either the flag is already cleared or no flag is passed, nothing is done.
*/
void srv_clr_admin_flag(struct server *s, enum srv_admin mode)
{
struct check *check = &s->check;
struct server *srv;
int xferred = -1;
if (!mode)
return;
/* stop going down as soon as we see the flag is not there anymore */
if (!(s->admin & mode))
return;
s->admin &= ~mode;
if (s->admin & SRV_ADMF_MAINT) {
/* remaining in maintenance mode, let's inform precisely about the
* situation.
*/
if (mode & SRV_ADMF_FMAINT) {
chunk_printf(&trash,
"%sServer %s/%s is leaving forced maintenance but remains in maintenance",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
if (s->track) /* normally it's mandatory here */
chunk_appendf(&trash, " via %s/%s",
s->track->proxy->id, s->track->id);
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
else if (mode & SRV_ADMF_IMAINT) {
chunk_printf(&trash,
"%sServer %s/%s remains in forced maintenance",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
/* don't report anything when leaving drain mode and remaining in maintenance */
}
else if (mode & SRV_ADMF_MAINT) {
/* OK here we're leaving maintenance, we have many things to check,
* because the server might possibly be coming back up depending on
* its state. In practice, leaving maintenance means that we should
* immediately turn to UP (more or less the slowstart) under the
* following conditions :
* - server is neither checked nor tracked
* - server tracks another server which is not checked
* - server tracks another server which is already up
* Which sums up as something simpler :
* "either the tracking server is up or the server's checks are disabled
* or up". Otherwise we only re-enable health checks. There's a special
* case associated to the stopping state which can be inherited. Note
* that the server might still be in drain mode, which is naturally dealt
* with by the lower level functions.
*/
if (s->check.state & CHK_ST_ENABLED) {
s->check.state &= ~CHK_ST_PAUSED;
check->health = check->rise; /* start OK but check immediately */
}
if ((!s->track || s->track->state != SRV_ST_STOPPED) &&
(!(s->agent.state & CHK_ST_ENABLED) || (s->agent.health >= s->agent.rise)) &&
(!(s->check.state & CHK_ST_ENABLED) || (s->check.health >= s->check.rise))) {
if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
if (s->proxy->last_change < now.tv_sec) // ignore negative times
s->proxy->down_time += now.tv_sec - s->proxy->last_change;
s->proxy->last_change = now.tv_sec;
}
if (s->last_change < now.tv_sec) // ignore negative times
s->down_time += now.tv_sec - s->last_change;
s->last_change = now.tv_sec;
if (s->track && s->track->state == SRV_ST_STOPPING)
s->state = SRV_ST_STOPPING;
else {
s->state = SRV_ST_STARTING;
if (s->slowstart > 0)
task_schedule(s->warmup, tick_add(now_ms, MS_TO_TICKS(MAX(1000, s->slowstart / 20))));
else
s->state = SRV_ST_RUNNING;
}
server_recalc_eweight(s);
/* If the server is set with "on-marked-up shutdown-backup-sessions",
* and it's not a backup server and its effective weight is > 0,
* then it can accept new connections, so we shut down all streams
* on all backup servers.
*/
if ((s->onmarkedup & HANA_ONMARKEDUP_SHUTDOWNBACKUPSESSIONS) &&
!(s->flags & SRV_F_BACKUP) && s->eweight)
srv_shutdown_backup_streams(s->proxy, SF_ERR_UP);
/* check if we can handle some connections queued at the proxy. We
* will take as many as we can handle.
*/
xferred = pendconn_grab_from_px(s);
}
if (mode & SRV_ADMF_FMAINT) {
chunk_printf(&trash,
"%sServer %s/%s is %s/%s (leaving forced maintenance)",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id,
(s->state == SRV_ST_STOPPED) ? "DOWN" : "UP",
(s->admin & SRV_ADMF_DRAIN) ? "DRAIN" : "READY");
}
else {
chunk_printf(&trash,
"%sServer %s/%s is %s/%s (leaving maintenance)",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id,
(s->state == SRV_ST_STOPPED) ? "DOWN" : "UP",
(s->admin & SRV_ADMF_DRAIN) ? "DRAIN" : "READY");
srv_append_status(&trash, s, NULL, xferred, 0);
}
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
else if ((mode & SRV_ADMF_DRAIN) && (s->admin & SRV_ADMF_DRAIN)) {
/* remaining in drain mode after removing one of its flags */
if (mode & SRV_ADMF_FDRAIN) {
chunk_printf(&trash,
"%sServer %s/%s is leaving forced drain but remains in drain mode",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
if (s->track) /* normally it's mandatory here */
chunk_appendf(&trash, " via %s/%s",
s->track->proxy->id, s->track->id);
}
else {
chunk_printf(&trash,
"%sServer %s/%s remains in forced drain mode",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id);
}
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
else if (mode & SRV_ADMF_DRAIN) {
/* OK completely leaving drain mode */
if (s->proxy->srv_bck == 0 && s->proxy->srv_act == 0) {
if (s->proxy->last_change < now.tv_sec) // ignore negative times
s->proxy->down_time += now.tv_sec - s->proxy->last_change;
s->proxy->last_change = now.tv_sec;
}
if (s->last_change < now.tv_sec) // ignore negative times
s->down_time += now.tv_sec - s->last_change;
s->last_change = now.tv_sec;
server_recalc_eweight(s);
if (mode & SRV_ADMF_FDRAIN) {
chunk_printf(&trash,
"%sServer %s/%s is %s (leaving forced drain)",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id,
(s->state == SRV_ST_STOPPED) ? "DOWN" : "UP");
}
else {
chunk_printf(&trash,
"%sServer %s/%s is %s (leaving drain)",
s->flags & SRV_F_BACKUP ? "Backup " : "",
s->proxy->id, s->id,
(s->state == SRV_ST_STOPPED) ? "DOWN" : "UP");
if (s->track) /* normally it's mandatory here */
chunk_appendf(&trash, " via %s/%s",
s->track->proxy->id, s->track->id);
}
Warning("%s.\n", trash.str);
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
/* stop going down if the equivalent flag is still present (forced or inherited) */
if (((mode & SRV_ADMF_MAINT) && (s->admin & SRV_ADMF_MAINT)) ||
((mode & SRV_ADMF_DRAIN) && (s->admin & SRV_ADMF_DRAIN)))
return;
if (mode & SRV_ADMF_MAINT)
mode = SRV_ADMF_IMAINT;
else if (mode & SRV_ADMF_DRAIN)
mode = SRV_ADMF_IDRAIN;
for (srv = s->trackers; srv; srv = srv->tracknext)
srv_clr_admin_flag(srv, mode);
}
/* Note: must not be declared <const> as its list will be overwritten.
* Please take care of keeping this list alphabetically sorted, doing so helps
* all code contributors.
* Optional keywords are also declared with a NULL ->parse() function so that
* the config parser can report an appropriate error when a known keyword was
* not enabled.
*/
static struct srv_kw_list srv_kws = { "ALL", { }, {
{ "id", srv_parse_id, 1, 0 }, /* set id# of server */
{ NULL, NULL, 0 },
}};
__attribute__((constructor))
static void __listener_init(void)
{
srv_register_keywords(&srv_kws);
}
/* Recomputes the server's eweight based on its state, uweight, the current time,
* and the proxy's algorihtm. To be used after updating sv->uweight. The warmup
* state is automatically disabled if the time is elapsed.
*/
void server_recalc_eweight(struct server *sv)
{
struct proxy *px = sv->proxy;
unsigned w;
if (now.tv_sec < sv->last_change || now.tv_sec >= sv->last_change + sv->slowstart) {
/* go to full throttle if the slowstart interval is reached */
if (sv->state == SRV_ST_STARTING)
sv->state = SRV_ST_RUNNING;
}
/* We must take care of not pushing the server to full throttle during slow starts.
* It must also start immediately, at least at the minimal step when leaving maintenance.
*/
if ((sv->state == SRV_ST_STARTING) && (px->lbprm.algo & BE_LB_PROP_DYN))
w = (px->lbprm.wdiv * (now.tv_sec - sv->last_change) + sv->slowstart) / sv->slowstart;
else
w = px->lbprm.wdiv;
sv->eweight = (sv->uweight * w + px->lbprm.wmult - 1) / px->lbprm.wmult;
/* now propagate the status change to any LB algorithms */
if (px->lbprm.update_server_eweight)
px->lbprm.update_server_eweight(sv);
else if (srv_is_usable(sv)) {
if (px->lbprm.set_server_status_up)
px->lbprm.set_server_status_up(sv);
}
else {
if (px->lbprm.set_server_status_down)
px->lbprm.set_server_status_down(sv);
}
}
/*
* Parses weight_str and configures sv accordingly.
* Returns NULL on success, error message string otherwise.
*/
const char *server_parse_weight_change_request(struct server *sv,
const char *weight_str)
{
struct proxy *px;
long int w;
char *end;
px = sv->proxy;
/* if the weight is terminated with '%', it is set relative to
* the initial weight, otherwise it is absolute.
*/
if (!*weight_str)
return "Require <weight> or <weight%>.\n";
w = strtol(weight_str, &end, 10);
if (end == weight_str)
return "Empty weight string empty or preceded by garbage";
else if (end[0] == '%' && end[1] == '\0') {
if (w < 0)
return "Relative weight must be positive.\n";
/* Avoid integer overflow */
if (w > 25600)
w = 25600;
w = sv->iweight * w / 100;
if (w > 256)
w = 256;
}
else if (w < 0 || w > 256)
return "Absolute weight can only be between 0 and 256 inclusive.\n";
else if (end[0] != '\0')
return "Trailing garbage in weight string";
if (w && w != sv->iweight && !(px->lbprm.algo & BE_LB_PROP_DYN))
return "Backend is using a static LB algorithm and only accepts weights '0%' and '100%'.\n";
sv->uweight = w;
server_recalc_eweight(sv);
return NULL;
}
/*
* Parses <addr_str> and configures <sv> accordingly. <from> precise
* the source of the change in the associated message log.
* Returns:
* - error string on error
* - NULL on success
*/
const char *server_parse_addr_change_request(struct server *sv,
const char *addr_str, const char *updater)
{
unsigned char ip[INET6_ADDRSTRLEN];
if (inet_pton(AF_INET6, addr_str, ip)) {
update_server_addr(sv, ip, AF_INET6, updater);
return NULL;
}
if (inet_pton(AF_INET, addr_str, ip)) {
update_server_addr(sv, ip, AF_INET, updater);
return NULL;
}
return "Could not understand IP address format.\n";
}
int parse_server(const char *file, int linenum, char **args, struct proxy *curproxy, struct proxy *defproxy)
{
struct server *newsrv = NULL;
const char *err;
char *errmsg = NULL;
int err_code = 0;
unsigned val;
char *fqdn = NULL;
if (!strcmp(args[0], "server") || !strcmp(args[0], "default-server")) { /* server address */
int cur_arg;
short realport = 0;
int do_agent = 0, do_check = 0, defsrv = (*args[0] == 'd');
if (!defsrv && curproxy == defproxy) {
Alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
else if (warnifnotcap(curproxy, PR_CAP_BE, file, linenum, args[0], NULL))
err_code |= ERR_ALERT | ERR_FATAL;
if (!*args[2]) {
Alert("parsing [%s:%d] : '%s' expects <name> and <addr>[:<port>] as arguments.\n",
file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
err = invalid_char(args[1]);
if (err && !defsrv) {
Alert("parsing [%s:%d] : character '%c' is not permitted in server name '%s'.\n",
file, linenum, *err, args[1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (!defsrv) {
struct sockaddr_storage *sk;
int port1, port2;
struct protocol *proto;
struct dns_resolution *curr_resolution;
if ((newsrv = calloc(1, sizeof(*newsrv))) == NULL) {
Alert("parsing [%s:%d] : out of memory.\n", file, linenum);
err_code |= ERR_ALERT | ERR_ABORT;
goto out;
}
/* the servers are linked backwards first */
newsrv->next = curproxy->srv;
curproxy->srv = newsrv;
newsrv->proxy = curproxy;
newsrv->conf.file = strdup(file);
newsrv->conf.line = linenum;
newsrv->obj_type = OBJ_TYPE_SERVER;
LIST_INIT(&newsrv->actconns);
LIST_INIT(&newsrv->pendconns);
LIST_INIT(&newsrv->priv_conns);
LIST_INIT(&newsrv->idle_conns);
LIST_INIT(&newsrv->safe_conns);
do_check = 0;
do_agent = 0;
newsrv->flags = 0;
newsrv->admin = 0;
newsrv->state = SRV_ST_RUNNING; /* early server setup */
newsrv->last_change = now.tv_sec;
newsrv->id = strdup(args[1]);
/* several ways to check the port component :
* - IP => port=+0, relative (IPv4 only)
* - IP: => port=+0, relative
* - IP:N => port=N, absolute
* - IP:+N => port=+N, relative
* - IP:-N => port=-N, relative
*/
sk = str2sa_range(args[2], &port1, &port2, &errmsg, NULL, &fqdn, 1);
if (!sk) {
Alert("parsing [%s:%d] : '%s %s' : %s\n", file, linenum, args[0], args[1], errmsg);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
proto = protocol_by_family(sk->ss_family);
if (!proto || !proto->connect) {
Alert("parsing [%s:%d] : '%s %s' : connect() not supported for this address family.\n",
file, linenum, args[0], args[1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (!port1 || !port2) {
/* no port specified, +offset, -offset */
newsrv->flags |= SRV_F_MAPPORTS;
}
else if (port1 != port2) {
/* port range */
Alert("parsing [%s:%d] : '%s %s' : port ranges are not allowed in '%s'\n",
file, linenum, args[0], args[1], args[2]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
else {
/* used by checks */
realport = port1;
}
/* save hostname and create associated name resolution */
newsrv->hostname = fqdn;
if (!fqdn)
goto skip_name_resolution;
fqdn = NULL;
if ((curr_resolution = calloc(1, sizeof(*curr_resolution))) == NULL)
goto skip_name_resolution;
curr_resolution->hostname_dn_len = dns_str_to_dn_label_len(newsrv->hostname);
if ((curr_resolution->hostname_dn = calloc(curr_resolution->hostname_dn_len + 1, sizeof(char))) == NULL)
goto skip_name_resolution;
if ((dns_str_to_dn_label(newsrv->hostname, curr_resolution->hostname_dn, curr_resolution->hostname_dn_len + 1)) == NULL) {
Alert("parsing [%s:%d] : Invalid hostname '%s'\n",
file, linenum, args[2]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
curr_resolution->requester = newsrv;
curr_resolution->requester_cb = snr_resolution_cb;
curr_resolution->requester_error_cb = snr_resolution_error_cb;
curr_resolution->status = RSLV_STATUS_NONE;
curr_resolution->step = RSLV_STEP_NONE;
/* a first resolution has been done by the configuration parser */
curr_resolution->last_resolution = 0;
newsrv->resolution = curr_resolution;
skip_name_resolution:
newsrv->addr = *sk;
newsrv->xprt = newsrv->check.xprt = newsrv->agent.xprt = &raw_sock;
if (!protocol_by_family(newsrv->addr.ss_family)) {
Alert("parsing [%s:%d] : Unknown protocol family %d '%s'\n",
file, linenum, newsrv->addr.ss_family, args[2]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.use_ssl = curproxy->defsrv.check.use_ssl;
newsrv->check.port = curproxy->defsrv.check.port;
newsrv->check.inter = curproxy->defsrv.check.inter;
newsrv->check.fastinter = curproxy->defsrv.check.fastinter;
newsrv->check.downinter = curproxy->defsrv.check.downinter;
newsrv->agent.use_ssl = curproxy->defsrv.agent.use_ssl;
newsrv->agent.port = curproxy->defsrv.agent.port;
if (curproxy->defsrv.agent.send_string != NULL)
newsrv->agent.send_string = strdup(curproxy->defsrv.agent.send_string);
newsrv->agent.send_string_len = curproxy->defsrv.agent.send_string_len;
newsrv->agent.inter = curproxy->defsrv.agent.inter;
newsrv->agent.fastinter = curproxy->defsrv.agent.fastinter;
newsrv->agent.downinter = curproxy->defsrv.agent.downinter;
newsrv->maxqueue = curproxy->defsrv.maxqueue;
newsrv->minconn = curproxy->defsrv.minconn;
newsrv->maxconn = curproxy->defsrv.maxconn;
newsrv->slowstart = curproxy->defsrv.slowstart;
newsrv->onerror = curproxy->defsrv.onerror;
newsrv->onmarkeddown = curproxy->defsrv.onmarkeddown;
newsrv->onmarkedup = curproxy->defsrv.onmarkedup;
newsrv->consecutive_errors_limit
= curproxy->defsrv.consecutive_errors_limit;
#ifdef OPENSSL
newsrv->use_ssl = curproxy->defsrv.use_ssl;
#endif
newsrv->uweight = newsrv->iweight
= curproxy->defsrv.iweight;
newsrv->check.status = HCHK_STATUS_INI;
newsrv->check.rise = curproxy->defsrv.check.rise;
newsrv->check.fall = curproxy->defsrv.check.fall;
newsrv->check.health = newsrv->check.rise; /* up, but will fall down at first failure */
newsrv->check.server = newsrv;
newsrv->check.tcpcheck_rules = &curproxy->tcpcheck_rules;
newsrv->agent.status = HCHK_STATUS_INI;
newsrv->agent.rise = curproxy->defsrv.agent.rise;
newsrv->agent.fall = curproxy->defsrv.agent.fall;
newsrv->agent.health = newsrv->agent.rise; /* up, but will fall down at first failure */
newsrv->agent.server = newsrv;
newsrv->dns_opts.family_prio = curproxy->defsrv.dns_opts.family_prio;
if (newsrv->dns_opts.family_prio == AF_UNSPEC)
newsrv->dns_opts.family_prio = AF_INET6;
memcpy(newsrv->dns_opts.pref_net,
curproxy->defsrv.dns_opts.pref_net,
sizeof(newsrv->dns_opts.pref_net));
newsrv->dns_opts.pref_net_nb = curproxy->defsrv.dns_opts.pref_net_nb;
cur_arg = 3;
} else {
newsrv = &curproxy->defsrv;
cur_arg = 1;
newsrv->dns_opts.family_prio = AF_INET6;
}
while (*args[cur_arg]) {
if (!strcmp(args[cur_arg], "agent-check")) {
global.maxsock++;
do_agent = 1;
cur_arg += 1;
} else if (!strcmp(args[cur_arg], "agent-inter")) {
const char *err = parse_time_err(args[cur_arg + 1], &val, TIME_UNIT_MS);
if (err) {
Alert("parsing [%s:%d] : unexpected character '%c' in 'agent-inter' argument of server %s.\n",
file, linenum, *err, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (val <= 0) {
Alert("parsing [%s:%d]: invalid value %d for argument '%s' of server %s.\n",
file, linenum, val, args[cur_arg], newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->agent.inter = val;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "agent-port")) {
global.maxsock++;
newsrv->agent.port = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "agent-send")) {
global.maxsock++;
free(newsrv->agent.send_string);
newsrv->agent.send_string_len = strlen(args[cur_arg + 1]);
newsrv->agent.send_string = calloc(1, newsrv->agent.send_string_len + 1);
memcpy(newsrv->agent.send_string, args[cur_arg + 1], newsrv->agent.send_string_len);
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "cookie")) {
newsrv->cookie = strdup(args[cur_arg + 1]);
newsrv->cklen = strlen(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "redir")) {
newsrv->rdr_pfx = strdup(args[cur_arg + 1]);
newsrv->rdr_len = strlen(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "resolvers")) {
newsrv->resolvers_id = strdup(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "resolve-prefer")) {
if (!strcmp(args[cur_arg + 1], "ipv4"))
newsrv->dns_opts.family_prio = AF_INET;
else if (!strcmp(args[cur_arg + 1], "ipv6"))
newsrv->dns_opts.family_prio = AF_INET6;
else {
Alert("parsing [%s:%d]: '%s' expects either ipv4 or ipv6 as argument.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "resolve-net")) {
char *p, *e;
unsigned char mask;
struct dns_options *opt;
if (!args[cur_arg + 1] || args[cur_arg + 1][0] == '\0') {
Alert("parsing [%s:%d]: '%s' expects a list of networks.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
opt = &newsrv->dns_opts;
/* Split arguments by comma, and convert it from ipv4 or ipv6
* string network in in_addr or in6_addr.
*/
p = args[cur_arg + 1];
e = p;
while (*p != '\0') {
/* If no room avalaible, return error. */
if (opt->pref_net_nb >= SRV_MAX_PREF_NET) {
Alert("parsing [%s:%d]: '%s' exceed %d networks.\n",
file, linenum, args[cur_arg], SRV_MAX_PREF_NET);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
/* look for end or comma. */
while (*e != ',' && *e != '\0')
e++;
if (*e == ',') {
*e = '\0';
e++;
}
if (str2net(p, 0, &opt->pref_net[opt->pref_net_nb].addr.in4,
&opt->pref_net[opt->pref_net_nb].mask.in4)) {
/* Try to convert input string from ipv4 or ipv6 network. */
opt->pref_net[opt->pref_net_nb].family = AF_INET;
} else if (str62net(p, &opt->pref_net[opt->pref_net_nb].addr.in6,
&mask)) {
/* Try to convert input string from ipv6 network. */
len2mask6(mask, &opt->pref_net[opt->pref_net_nb].mask.in6);
opt->pref_net[opt->pref_net_nb].family = AF_INET6;
} else {
/* All network conversions fail, retrun error. */
Alert("parsing [%s:%d]: '%s': invalid network '%s'.\n",
file, linenum, args[cur_arg], p);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
opt->pref_net_nb++;
p = e;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "rise")) {
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d]: '%s' expects an integer argument.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.rise = atol(args[cur_arg + 1]);
if (newsrv->check.rise <= 0) {
Alert("parsing [%s:%d]: '%s' has to be > 0.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (newsrv->check.health)
newsrv->check.health = newsrv->check.rise;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "fall")) {
newsrv->check.fall = atol(args[cur_arg + 1]);
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d]: '%s' expects an integer argument.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (newsrv->check.fall <= 0) {
Alert("parsing [%s:%d]: '%s' has to be > 0.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "inter")) {
const char *err = parse_time_err(args[cur_arg + 1], &val, TIME_UNIT_MS);
if (err) {
Alert("parsing [%s:%d] : unexpected character '%c' in 'inter' argument of server %s.\n",
file, linenum, *err, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (val <= 0) {
Alert("parsing [%s:%d]: invalid value %d for argument '%s' of server %s.\n",
file, linenum, val, args[cur_arg], newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.inter = val;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "fastinter")) {
const char *err = parse_time_err(args[cur_arg + 1], &val, TIME_UNIT_MS);
if (err) {
Alert("parsing [%s:%d]: unexpected character '%c' in 'fastinter' argument of server %s.\n",
file, linenum, *err, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (val <= 0) {
Alert("parsing [%s:%d]: invalid value %d for argument '%s' of server %s.\n",
file, linenum, val, args[cur_arg], newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.fastinter = val;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "downinter")) {
const char *err = parse_time_err(args[cur_arg + 1], &val, TIME_UNIT_MS);
if (err) {
Alert("parsing [%s:%d]: unexpected character '%c' in 'downinter' argument of server %s.\n",
file, linenum, *err, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (val <= 0) {
Alert("parsing [%s:%d]: invalid value %d for argument '%s' of server %s.\n",
file, linenum, val, args[cur_arg], newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.downinter = val;
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "addr")) {
struct sockaddr_storage *sk;
int port1, port2;
struct protocol *proto;
sk = str2sa_range(args[cur_arg + 1], &port1, &port2, &errmsg, NULL, NULL, 1);
if (!sk) {
Alert("parsing [%s:%d] : '%s' : %s\n",
file, linenum, args[cur_arg], errmsg);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
proto = protocol_by_family(sk->ss_family);
if (!proto || !proto->connect) {
Alert("parsing [%s:%d] : '%s %s' : connect() not supported for this address family.\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (port1 != port2) {
Alert("parsing [%s:%d] : '%s' : port ranges and offsets are not allowed in '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->check.addr = newsrv->agent.addr = *sk;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "port")) {
newsrv->check.port = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "backup")) {
newsrv->flags |= SRV_F_BACKUP;
cur_arg ++;
}
else if (!defsrv && !strcmp(args[cur_arg], "non-stick")) {
newsrv->flags |= SRV_F_NON_STICK;
cur_arg ++;
}
else if (!defsrv && !strcmp(args[cur_arg], "send-proxy")) {
newsrv->pp_opts |= SRV_PP_V1;
cur_arg ++;
}
else if (!defsrv && !strcmp(args[cur_arg], "send-proxy-v2")) {
newsrv->pp_opts |= SRV_PP_V2;
cur_arg ++;
}
else if (!defsrv && !strcmp(args[cur_arg], "check-send-proxy")) {
newsrv->check.send_proxy = 1;
cur_arg ++;
}
else if (!strcmp(args[cur_arg], "weight")) {
int w;
w = atol(args[cur_arg + 1]);
if (w < 0 || w > SRV_UWGHT_MAX) {
Alert("parsing [%s:%d] : weight of server %s is not within 0 and %d (%d).\n",
file, linenum, newsrv->id, SRV_UWGHT_MAX, w);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->uweight = newsrv->iweight = w;
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "minconn")) {
newsrv->minconn = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "maxconn")) {
newsrv->maxconn = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "maxqueue")) {
newsrv->maxqueue = atol(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "slowstart")) {
/* slowstart is stored in seconds */
const char *err = parse_time_err(args[cur_arg + 1], &val, TIME_UNIT_MS);
if (err) {
Alert("parsing [%s:%d] : unexpected character '%c' in 'slowstart' argument of server %s.\n",
file, linenum, *err, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->slowstart = (val + 999) / 1000;
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "track")) {
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d]: 'track' expects [<proxy>/]<server> as argument.\n",
file, linenum);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->trackit = strdup(args[cur_arg + 1]);
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "check")) {
global.maxsock++;
do_check = 1;
cur_arg += 1;
}
else if (!defsrv && !strcmp(args[cur_arg], "disabled")) {
newsrv->admin |= SRV_ADMF_CMAINT;
newsrv->admin |= SRV_ADMF_FMAINT;
newsrv->state = SRV_ST_STOPPED;
newsrv->check.state |= CHK_ST_PAUSED;
newsrv->check.health = 0;
cur_arg += 1;
}
else if (!defsrv && !strcmp(args[cur_arg], "observe")) {
if (!strcmp(args[cur_arg + 1], "none"))
newsrv->observe = HANA_OBS_NONE;
else if (!strcmp(args[cur_arg + 1], "layer4"))
newsrv->observe = HANA_OBS_LAYER4;
else if (!strcmp(args[cur_arg + 1], "layer7")) {
if (curproxy->mode != PR_MODE_HTTP) {
Alert("parsing [%s:%d]: '%s' can only be used in http proxies.\n",
file, linenum, args[cur_arg + 1]);
err_code |= ERR_ALERT;
}
newsrv->observe = HANA_OBS_LAYER7;
}
else {
Alert("parsing [%s:%d]: '%s' expects one of 'none', "
"'layer4', 'layer7' but got '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "on-error")) {
if (!strcmp(args[cur_arg + 1], "fastinter"))
newsrv->onerror = HANA_ONERR_FASTINTER;
else if (!strcmp(args[cur_arg + 1], "fail-check"))
newsrv->onerror = HANA_ONERR_FAILCHK;
else if (!strcmp(args[cur_arg + 1], "sudden-death"))
newsrv->onerror = HANA_ONERR_SUDDTH;
else if (!strcmp(args[cur_arg + 1], "mark-down"))
newsrv->onerror = HANA_ONERR_MARKDWN;
else {
Alert("parsing [%s:%d]: '%s' expects one of 'fastinter', "
"'fail-check', 'sudden-death' or 'mark-down' but got '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "on-marked-down")) {
if (!strcmp(args[cur_arg + 1], "shutdown-sessions"))
newsrv->onmarkeddown = HANA_ONMARKEDDOWN_SHUTDOWNSESSIONS;
else {
Alert("parsing [%s:%d]: '%s' expects 'shutdown-sessions' but got '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "on-marked-up")) {
if (!strcmp(args[cur_arg + 1], "shutdown-backup-sessions"))
newsrv->onmarkedup = HANA_ONMARKEDUP_SHUTDOWNBACKUPSESSIONS;
else {
Alert("parsing [%s:%d]: '%s' expects 'shutdown-backup-sessions' but got '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!strcmp(args[cur_arg], "error-limit")) {
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d]: '%s' expects an integer argument.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->consecutive_errors_limit = atoi(args[cur_arg + 1]);
if (newsrv->consecutive_errors_limit <= 0) {
Alert("parsing [%s:%d]: %s has to be > 0.\n",
file, linenum, args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
cur_arg += 2;
}
else if (!defsrv && !strcmp(args[cur_arg], "source")) { /* address to which we bind when connecting */
int port_low, port_high;
struct sockaddr_storage *sk;
struct protocol *proto;
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d] : '%s' expects <addr>[:<port>[-<port>]], and optionally '%s' <addr>, and '%s' <name> as argument.\n",
file, linenum, "source", "usesrc", "interface");
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->conn_src.opts |= CO_SRC_BIND;
sk = str2sa_range(args[cur_arg + 1], &port_low, &port_high, &errmsg, NULL, NULL, 1);
if (!sk) {
Alert("parsing [%s:%d] : '%s %s' : %s\n",
file, linenum, args[cur_arg], args[cur_arg+1], errmsg);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
proto = protocol_by_family(sk->ss_family);
if (!proto || !proto->connect) {
Alert("parsing [%s:%d] : '%s %s' : connect() not supported for this address family.\n",
file, linenum, args[cur_arg], args[cur_arg+1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->conn_src.source_addr = *sk;
if (port_low != port_high) {
int i;
if (!port_low || !port_high) {
Alert("parsing [%s:%d] : %s does not support port offsets (found '%s').\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (port_low <= 0 || port_low > 65535 ||
port_high <= 0 || port_high > 65535 ||
port_low > port_high) {
Alert("parsing [%s:%d] : invalid source port range %d-%d.\n",
file, linenum, port_low, port_high);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->conn_src.sport_range = port_range_alloc_range(port_high - port_low + 1);
for (i = 0; i < newsrv->conn_src.sport_range->size; i++)
newsrv->conn_src.sport_range->ports[i] = port_low + i;
}
cur_arg += 2;
while (*(args[cur_arg])) {
if (!strcmp(args[cur_arg], "usesrc")) { /* address to use outside */
#if defined(CONFIG_HAP_TRANSPARENT)
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d] : '%s' expects <addr>[:<port>], 'client', 'clientip', or 'hdr_ip(name,#)' as argument.\n",
file, linenum, "usesrc");
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (!strcmp(args[cur_arg + 1], "client")) {
newsrv->conn_src.opts &= ~CO_SRC_TPROXY_MASK;
newsrv->conn_src.opts |= CO_SRC_TPROXY_CLI;
} else if (!strcmp(args[cur_arg + 1], "clientip")) {
newsrv->conn_src.opts &= ~CO_SRC_TPROXY_MASK;
newsrv->conn_src.opts |= CO_SRC_TPROXY_CIP;
} else if (!strncmp(args[cur_arg + 1], "hdr_ip(", 7)) {
char *name, *end;
name = args[cur_arg+1] + 7;
while (isspace(*name))
name++;
end = name;
while (*end && !isspace(*end) && *end != ',' && *end != ')')
end++;
newsrv->conn_src.opts &= ~CO_SRC_TPROXY_MASK;
newsrv->conn_src.opts |= CO_SRC_TPROXY_DYN;
newsrv->conn_src.bind_hdr_name = calloc(1, end - name + 1);
newsrv->conn_src.bind_hdr_len = end - name;
memcpy(newsrv->conn_src.bind_hdr_name, name, end - name);
newsrv->conn_src.bind_hdr_name[end-name] = '\0';
newsrv->conn_src.bind_hdr_occ = -1;
/* now look for an occurrence number */
while (isspace(*end))
end++;
if (*end == ',') {
end++;
name = end;
if (*end == '-')
end++;
while (isdigit((int)*end))
end++;
newsrv->conn_src.bind_hdr_occ = strl2ic(name, end-name);
}
if (newsrv->conn_src.bind_hdr_occ < -MAX_HDR_HISTORY) {
Alert("parsing [%s:%d] : usesrc hdr_ip(name,num) does not support negative"
" occurrences values smaller than %d.\n",
file, linenum, MAX_HDR_HISTORY);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
} else {
struct sockaddr_storage *sk;
int port1, port2;
sk = str2sa_range(args[cur_arg + 1], &port1, &port2, &errmsg, NULL, NULL, 1);
if (!sk) {
Alert("parsing [%s:%d] : '%s %s' : %s\n",
file, linenum, args[cur_arg], args[cur_arg+1], errmsg);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
proto = protocol_by_family(sk->ss_family);
if (!proto || !proto->connect) {
Alert("parsing [%s:%d] : '%s %s' : connect() not supported for this address family.\n",
file, linenum, args[cur_arg], args[cur_arg+1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (port1 != port2) {
Alert("parsing [%s:%d] : '%s' : port ranges and offsets are not allowed in '%s'\n",
file, linenum, args[cur_arg], args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
newsrv->conn_src.tproxy_addr = *sk;
newsrv->conn_src.opts |= CO_SRC_TPROXY_ADDR;
}
global.last_checks |= LSTCHK_NETADM;
cur_arg += 2;
continue;
#else /* no TPROXY support */
Alert("parsing [%s:%d] : '%s' not allowed here because support for TPROXY was not compiled in.\n",
file, linenum, "usesrc");
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
#endif /* defined(CONFIG_HAP_TRANSPARENT) */
} /* "usesrc" */
if (!strcmp(args[cur_arg], "interface")) { /* specifically bind to this interface */
#ifdef SO_BINDTODEVICE
if (!*args[cur_arg + 1]) {
Alert("parsing [%s:%d] : '%s' : missing interface name.\n",
file, linenum, args[0]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
free(newsrv->conn_src.iface_name);
newsrv->conn_src.iface_name = strdup(args[cur_arg + 1]);
newsrv->conn_src.iface_len = strlen(newsrv->conn_src.iface_name);
global.last_checks |= LSTCHK_NETADM;
#else
Alert("parsing [%s:%d] : '%s' : '%s' option not implemented.\n",
file, linenum, args[0], args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
#endif
cur_arg += 2;
continue;
}
/* this keyword in not an option of "source" */
break;
} /* while */
}
else if (!defsrv && !strcmp(args[cur_arg], "usesrc")) { /* address to use outside: needs "source" first */
Alert("parsing [%s:%d] : '%s' only allowed after a '%s' statement.\n",
file, linenum, "usesrc", "source");
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
else if (!defsrv && !strcmp(args[cur_arg], "namespace")) {
#ifdef CONFIG_HAP_NS
char *arg = args[cur_arg + 1];
if (!strcmp(arg, "*")) {
newsrv->flags |= SRV_F_USE_NS_FROM_PP;
} else {
newsrv->netns = netns_store_lookup(arg, strlen(arg));
if (newsrv->netns == NULL)
newsrv->netns = netns_store_insert(arg);
if (newsrv->netns == NULL) {
Alert("Cannot open namespace '%s'.\n", args[cur_arg + 1]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
}
#else
Alert("parsing [%s:%d] : '%s' : '%s' option not implemented.\n",
file, linenum, args[0], args[cur_arg]);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
#endif
cur_arg += 2;
}
else {
static int srv_dumped;
struct srv_kw *kw;
char *err;
kw = srv_find_kw(args[cur_arg]);
if (kw) {
char *err = NULL;
int code;
if (!kw->parse) {
Alert("parsing [%s:%d] : '%s %s' : '%s' option is not implemented in this version (check build options).\n",
file, linenum, args[0], args[1], args[cur_arg]);
cur_arg += 1 + kw->skip ;
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (defsrv && !kw->default_ok) {
Alert("parsing [%s:%d] : '%s %s' : '%s' option is not accepted in default-server sections.\n",
file, linenum, args[0], args[1], args[cur_arg]);
cur_arg += 1 + kw->skip ;
err_code |= ERR_ALERT;
continue;
}
code = kw->parse(args, &cur_arg, curproxy, newsrv, &err);
err_code |= code;
if (code) {
if (err && *err) {
indent_msg(&err, 2);
Alert("parsing [%s:%d] : '%s %s' : %s\n", file, linenum, args[0], args[1], err);
}
else
Alert("parsing [%s:%d] : '%s %s' : error encountered while processing '%s'.\n",
file, linenum, args[0], args[1], args[cur_arg]);
if (code & ERR_FATAL) {
free(err);
cur_arg += 1 + kw->skip;
goto out;
}
}
free(err);
cur_arg += 1 + kw->skip;
continue;
}
err = NULL;
if (!srv_dumped) {
srv_dump_kws(&err);
indent_msg(&err, 4);
srv_dumped = 1;
}
Alert("parsing [%s:%d] : '%s %s' unknown keyword '%s'.%s%s\n",
file, linenum, args[0], args[1], args[cur_arg],
err ? " Registered keywords :" : "", err ? err : "");
free(err);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
}
if (do_check) {
const char *ret;
if (newsrv->trackit) {
Alert("parsing [%s:%d]: unable to enable checks and tracking at the same time!\n",
file, linenum);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
/* If neither a port nor an addr was specified and no check transport
* layer is forced, then the transport layer used by the checks is the
* same as for the production traffic. Otherwise we use raw_sock by
* default, unless one is specified.
*/
if (!newsrv->check.port && !is_addr(&newsrv->check.addr)) {
#ifdef USE_OPENSSL
newsrv->check.use_ssl |= (newsrv->use_ssl || (newsrv->proxy->options & PR_O_TCPCHK_SSL));
#endif
newsrv->check.send_proxy |= (newsrv->pp_opts);
}
/* try to get the port from check_core.addr if check.port not set */
if (!newsrv->check.port)
newsrv->check.port = get_host_port(&newsrv->check.addr);
if (!newsrv->check.port)
newsrv->check.port = realport; /* by default */
if (!newsrv->check.port) {
/* not yet valid, because no port was set on
* the server either. We'll check if we have
* a known port on the first listener.
*/
struct listener *l;
list_for_each_entry(l, &curproxy->conf.listeners, by_fe) {
newsrv->check.port = get_host_port(&l->addr);
if (newsrv->check.port)
break;
}
}
/*
* We need at least a service port, a check port or the first tcp-check rule must
* be a 'connect' one when checking an IPv4/IPv6 server.
*/
if (!newsrv->check.port &&
(is_inet_addr(&newsrv->check.addr) ||
(!is_addr(&newsrv->check.addr) && is_inet_addr(&newsrv->addr)))) {
struct tcpcheck_rule *r = NULL;
struct list *l;
r = (struct tcpcheck_rule *)newsrv->proxy->tcpcheck_rules.n;
if (!r) {
Alert("parsing [%s:%d] : server %s has neither service port nor check port. Check has been disabled.\n",
file, linenum, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
/* search the first action (connect / send / expect) in the list */
l = &newsrv->proxy->tcpcheck_rules;
list_for_each_entry(r, l, list) {
if (r->action != TCPCHK_ACT_COMMENT)
break;
}
if ((r->action != TCPCHK_ACT_CONNECT) || !r->port) {
Alert("parsing [%s:%d] : server %s has neither service port nor check port nor tcp_check rule 'connect' with port information. Check has been disabled.\n",
file, linenum, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
else {
/* scan the tcp-check ruleset to ensure a port has been configured */
l = &newsrv->proxy->tcpcheck_rules;
list_for_each_entry(r, l, list) {
if ((r->action == TCPCHK_ACT_CONNECT) && (!r->port)) {
Alert("parsing [%s:%d] : server %s has neither service port nor check port, and a tcp_check rule 'connect' with no port information. Check has been disabled.\n",
file, linenum, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
}
}
}
/* note: check type will be set during the config review phase */
ret = init_check(&newsrv->check, 0);
if (ret) {
Alert("parsing [%s:%d] : %s.\n", file, linenum, ret);
err_code |= ERR_ALERT | ERR_ABORT;
goto out;
}
if (newsrv->resolution)
newsrv->resolution->opts = &newsrv->dns_opts;
newsrv->check.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED;
}
if (do_agent) {
const char *ret;
if (!newsrv->agent.port) {
Alert("parsing [%s:%d] : server %s does not have agent port. Agent check has been disabled.\n",
file, linenum, newsrv->id);
err_code |= ERR_ALERT | ERR_FATAL;
goto out;
}
if (!newsrv->agent.inter)
newsrv->agent.inter = newsrv->check.inter;
ret = init_check(&newsrv->agent, PR_O2_LB_AGENT_CHK);
if (ret) {
Alert("parsing [%s:%d] : %s.\n", file, linenum, ret);
err_code |= ERR_ALERT | ERR_ABORT;
goto out;
}
newsrv->agent.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_AGENT;
}
if (!defsrv) {
if (newsrv->flags & SRV_F_BACKUP)
curproxy->srv_bck++;
else
curproxy->srv_act++;
srv_lb_commit_status(newsrv);
}
}
free(fqdn);
return 0;
out:
free(fqdn);
free(errmsg);
return err_code;
}
/* Returns a pointer to the first server matching either id <id>.
* NULL is returned if no match is found.
* the lookup is performed in the backend <bk>
*/
struct server *server_find_by_id(struct proxy *bk, int id)
{
struct eb32_node *eb32;
struct server *curserver;
if (!bk || (id ==0))
return NULL;
/* <bk> has no backend capabilities, so it can't have a server */
if (!(bk->cap & PR_CAP_BE))
return NULL;
curserver = NULL;
eb32 = eb32_lookup(&bk->conf.used_server_id, id);
if (eb32)
curserver = container_of(eb32, struct server, conf.id);
return curserver;
}
/* Returns a pointer to the first server matching either name <name>, or id
* if <name> starts with a '#'. NULL is returned if no match is found.
* the lookup is performed in the backend <bk>
*/
struct server *server_find_by_name(struct proxy *bk, const char *name)
{
struct server *curserver;
if (!bk || !name)
return NULL;
/* <bk> has no backend capabilities, so it can't have a server */
if (!(bk->cap & PR_CAP_BE))
return NULL;
curserver = NULL;
if (*name == '#') {
curserver = server_find_by_id(bk, atoi(name + 1));
if (curserver)
return curserver;
}
else {
curserver = bk->srv;
while (curserver && (strcmp(curserver->id, name) != 0))
curserver = curserver->next;
if (curserver)
return curserver;
}
return NULL;
}
struct server *server_find_best_match(struct proxy *bk, char *name, int id, int *diff)
{
struct server *byname;
struct server *byid;
if (!name && !id)
return NULL;
if (diff)
*diff = 0;
byname = byid = NULL;
if (name) {
byname = server_find_by_name(bk, name);
if (byname && (!id || byname->puid == id))
return byname;
}
/* remaining possibilities :
* - name not set
* - name set but not found
* - name found but ID doesn't match
*/
if (id) {
byid = server_find_by_id(bk, id);
if (byid) {
if (byname) {
/* use id only if forced by configuration */
if (byid->flags & SRV_F_FORCED_ID) {
if (diff)
*diff |= 2;
return byid;
}
else {
if (diff)
*diff |= 1;
return byname;
}
}
/* remaining possibilities:
* - name not set
* - name set but not found
*/
if (name && diff)
*diff |= 2;
return byid;
}
/* id bot found */
if (byname) {
if (diff)
*diff |= 1;
return byname;
}
}
return NULL;
}
/* Update a server state using the parameters available in the params list */
static void srv_update_state(struct server *srv, int version, char **params)
{
char *p;
struct chunk *msg;
/* fields since version 1
* and common to all other upcoming versions
*/
enum srv_state srv_op_state;
enum srv_admin srv_admin_state;
unsigned srv_uweight, srv_iweight;
unsigned long srv_last_time_change;
short srv_check_status;
enum chk_result srv_check_result;
int srv_check_health;
int srv_check_state, srv_agent_state;
int bk_f_forced_id;
int srv_f_forced_id;
msg = get_trash_chunk();
switch (version) {
case 1:
/*
* now we can proceed with server's state update:
* srv_addr: params[0]
* srv_op_state: params[1]
* srv_admin_state: params[2]
* srv_uweight: params[3]
* srv_iweight: params[4]
* srv_last_time_change: params[5]
* srv_check_status: params[6]
* srv_check_result: params[7]
* srv_check_health: params[8]
* srv_check_state: params[9]
* srv_agent_state: params[10]
* bk_f_forced_id: params[11]
* srv_f_forced_id: params[12]
*/
/* validating srv_op_state */
p = NULL;
errno = 0;
srv_op_state = strtol(params[1], &p, 10);
if ((p == params[1]) || errno == EINVAL || errno == ERANGE ||
(srv_op_state != SRV_ST_STOPPED &&
srv_op_state != SRV_ST_STARTING &&
srv_op_state != SRV_ST_RUNNING &&
srv_op_state != SRV_ST_STOPPING)) {
chunk_appendf(msg, ", invalid srv_op_state value '%s'", params[1]);
}
/* validating srv_admin_state */
p = NULL;
errno = 0;
srv_admin_state = strtol(params[2], &p, 10);
if ((p == params[2]) || errno == EINVAL || errno == ERANGE ||
(srv_admin_state != 0 &&
srv_admin_state != SRV_ADMF_FMAINT &&
srv_admin_state != SRV_ADMF_IMAINT &&
srv_admin_state != SRV_ADMF_CMAINT &&
srv_admin_state != (SRV_ADMF_CMAINT | SRV_ADMF_FMAINT) &&
srv_admin_state != SRV_ADMF_FDRAIN &&
srv_admin_state != SRV_ADMF_IDRAIN)) {
chunk_appendf(msg, ", invalid srv_admin_state value '%s'", params[2]);
}
/* validating srv_uweight */
p = NULL;
errno = 0;
srv_uweight = strtol(params[3], &p, 10);
if ((p == params[3]) || errno == EINVAL || errno == ERANGE || (srv_uweight > SRV_UWGHT_MAX))
chunk_appendf(msg, ", invalid srv_uweight value '%s'", params[3]);
/* validating srv_iweight */
p = NULL;
errno = 0;
srv_iweight = strtol(params[4], &p, 10);
if ((p == params[4]) || errno == EINVAL || errno == ERANGE || (srv_iweight > SRV_UWGHT_MAX))
chunk_appendf(msg, ", invalid srv_iweight value '%s'", params[4]);
/* validating srv_last_time_change */
p = NULL;
errno = 0;
srv_last_time_change = strtol(params[5], &p, 10);
if ((p == params[5]) || errno == EINVAL || errno == ERANGE)
chunk_appendf(msg, ", invalid srv_last_time_change value '%s'", params[5]);
/* validating srv_check_status */
p = NULL;
errno = 0;
srv_check_status = strtol(params[6], &p, 10);
if (p == params[6] || errno == EINVAL || errno == ERANGE ||
(srv_check_status >= HCHK_STATUS_SIZE))
chunk_appendf(msg, ", invalid srv_check_status value '%s'", params[6]);
/* validating srv_check_result */
p = NULL;
errno = 0;
srv_check_result = strtol(params[7], &p, 10);
if ((p == params[7]) || errno == EINVAL || errno == ERANGE ||
(srv_check_result != CHK_RES_UNKNOWN &&
srv_check_result != CHK_RES_NEUTRAL &&
srv_check_result != CHK_RES_FAILED &&
srv_check_result != CHK_RES_PASSED &&
srv_check_result != CHK_RES_CONDPASS)) {
chunk_appendf(msg, ", invalid srv_check_result value '%s'", params[7]);
}
/* validating srv_check_health */
p = NULL;
errno = 0;
srv_check_health = strtol(params[8], &p, 10);
if (p == params[8] || errno == EINVAL || errno == ERANGE)
chunk_appendf(msg, ", invalid srv_check_health value '%s'", params[8]);
/* validating srv_check_state */
p = NULL;
errno = 0;
srv_check_state = strtol(params[9], &p, 10);
if (p == params[9] || errno == EINVAL || errno == ERANGE ||
(srv_check_state & ~(CHK_ST_INPROGRESS | CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_PAUSED | CHK_ST_AGENT)))
chunk_appendf(msg, ", invalid srv_check_state value '%s'", params[9]);
/* validating srv_agent_state */
p = NULL;
errno = 0;
srv_agent_state = strtol(params[10], &p, 10);
if (p == params[10] || errno == EINVAL || errno == ERANGE ||
(srv_agent_state & ~(CHK_ST_INPROGRESS | CHK_ST_CONFIGURED | CHK_ST_ENABLED | CHK_ST_PAUSED | CHK_ST_AGENT)))
chunk_appendf(msg, ", invalid srv_agent_state value '%s'", params[10]);
/* validating bk_f_forced_id */
p = NULL;
errno = 0;
bk_f_forced_id = strtol(params[11], &p, 10);
if (p == params[11] || errno == EINVAL || errno == ERANGE || !((bk_f_forced_id == 0) || (bk_f_forced_id == 1)))
chunk_appendf(msg, ", invalid bk_f_forced_id value '%s'", params[11]);
/* validating srv_f_forced_id */
p = NULL;
errno = 0;
srv_f_forced_id = strtol(params[12], &p, 10);
if (p == params[12] || errno == EINVAL || errno == ERANGE || !((srv_f_forced_id == 0) || (srv_f_forced_id == 1)))
chunk_appendf(msg, ", invalid srv_f_forced_id value '%s'", params[12]);
/* don't apply anything if one error has been detected */
if (msg->len)
goto out;
/* recover operational state and apply it to this server
* and all servers tracking this one */
switch (srv_op_state) {
case SRV_ST_STOPPED:
srv->check.health = 0;
srv_set_stopped(srv, "changed from server-state after a reload");
break;
case SRV_ST_STARTING:
srv->state = srv_op_state;
break;
case SRV_ST_STOPPING:
srv->check.health = srv->check.rise + srv->check.fall - 1;
srv_set_stopping(srv, "changed from server-state after a reload");
break;
case SRV_ST_RUNNING:
srv->check.health = srv->check.rise + srv->check.fall - 1;
srv_set_running(srv, "");
break;
}
/* When applying server state, the following rules apply:
* - in case of a configuration change, we apply the setting from the new
* configuration, regardless of old running state
* - if no configuration change, we apply old running state only if old running
* state is different from new configuration state
*/
/* configuration has changed */
if ((srv_admin_state & SRV_ADMF_CMAINT) != (srv->admin & SRV_ADMF_CMAINT)) {
if (srv->admin & SRV_ADMF_CMAINT)
srv_adm_set_maint(srv);
else
srv_adm_set_ready(srv);
}
/* configuration is the same, let's compate old running state and new conf state */
else {
if (srv_admin_state & SRV_ADMF_FMAINT && !(srv->admin & SRV_ADMF_CMAINT))
srv_adm_set_maint(srv);
else if (!(srv_admin_state & SRV_ADMF_FMAINT) && (srv->admin & SRV_ADMF_CMAINT))
srv_adm_set_ready(srv);
}
/* apply drain mode if server is currently enabled */
if (!(srv->admin & SRV_ADMF_FMAINT) && (srv_admin_state & SRV_ADMF_FDRAIN)) {
/* The SRV_ADMF_FDRAIN flag is inherited when srv->iweight is 0
* (srv->iweight is the weight set up in configuration)
* so we don't want to apply it when srv_iweight is 0 and
* srv->iweight is greater than 0. Purpose is to give the
* chance to the admin to re-enable this server from configuration
* file by setting a new weight > 0.
*/
if ((srv_iweight == 0) && (srv->iweight > 0)) {
srv_adm_set_drain(srv);
}
}
srv->last_change = date.tv_sec - srv_last_time_change;
srv->check.status = srv_check_status;
srv->check.result = srv_check_result;
srv->check.health = srv_check_health;
/* Only case we want to apply is removing ENABLED flag which could have been
* done by the "disable health" command over the stats socket
*/
if ((srv->check.state & CHK_ST_CONFIGURED) &&
(srv_check_state & CHK_ST_CONFIGURED) &&
!(srv_check_state & CHK_ST_ENABLED))
srv->check.state &= ~CHK_ST_ENABLED;
/* Only case we want to apply is removing ENABLED flag which could have been
* done by the "disable agent" command over the stats socket
*/
if ((srv->agent.state & CHK_ST_CONFIGURED) &&
(srv_agent_state & CHK_ST_CONFIGURED) &&
!(srv_agent_state & CHK_ST_ENABLED))
srv->agent.state &= ~CHK_ST_ENABLED;
/* We want to apply the previous 'running' weight (srv_uweight) only if there
* was no change in the configuration: both previous and new iweight are equals
*
* It means that a configuration file change has precedence over a unix socket change
* for server's weight
*
* by default, HAProxy applies the following weight when parsing the configuration
* srv->uweight = srv->iweight
*/
if (srv_iweight == srv->iweight) {
srv->uweight = srv_uweight;
}
server_recalc_eweight(srv);
/* update server IP only if DNS resolution is used on the server */
if (srv->resolution) {
struct sockaddr_storage addr;
memset(&addr, 0, sizeof(struct sockaddr_storage));
if (str2ip2(params[0], &addr, AF_UNSPEC)) {
int port;
/* save the port, applies the new IP then reconfigure the port */
port = get_host_port(&srv->addr);
srv->addr.ss_family = addr.ss_family;
str2ip2(params[0], &srv->addr, srv->addr.ss_family);
set_host_port(&srv->addr, port);
}
else
chunk_appendf(msg, ", can't parse IP: %s", params[0]);
}
break;
default:
chunk_appendf(msg, ", version '%d' not supported", version);
}
out:
if (msg->len) {
chunk_appendf(msg, "\n");
Warning("server-state application failed for server '%s/%s'%s",
srv->proxy->id, srv->id, msg->str);
}
}
/* This function parses all the proxies and only take care of the backends (since we're looking for server)
* For each proxy, it does the following:
* - opens its server state file (either one or local one)
* - read whole file, line by line
* - analyse each line to check if it matches our current backend:
* - backend name matches
* - backend id matches if id is forced and name doesn't match
* - if the server pointed by the line is found, then state is applied
*
* If the running backend uuid or id differs from the state file, then HAProxy reports
* a warning.
*/
void apply_server_state(void)
{
char *cur, *end;
char mybuf[SRV_STATE_LINE_MAXLEN];
int mybuflen;
char *params[SRV_STATE_FILE_MAX_FIELDS];
char *srv_params[SRV_STATE_FILE_MAX_FIELDS];
int arg, srv_arg, version, diff;
FILE *f;
char *filepath;
char globalfilepath[MAXPATHLEN + 1];
char localfilepath[MAXPATHLEN + 1];
int len, fileopenerr, globalfilepathlen, localfilepathlen;
extern struct proxy *proxy;
struct proxy *curproxy, *bk;
struct server *srv;
globalfilepathlen = 0;
/* create the globalfilepath variable */
if (global.server_state_file) {
/* absolute path or no base directory provided */
if ((global.server_state_file[0] == '/') || (!global.server_state_base)) {
len = strlen(global.server_state_file);
if (len > MAXPATHLEN) {
globalfilepathlen = 0;
goto globalfileerror;
}
memcpy(globalfilepath, global.server_state_file, len);
globalfilepath[len] = '\0';
globalfilepathlen = len;
}
else if (global.server_state_base) {
len = strlen(global.server_state_base);
globalfilepathlen += len;
if (globalfilepathlen > MAXPATHLEN) {
globalfilepathlen = 0;
goto globalfileerror;
}
strncpy(globalfilepath, global.server_state_base, len);
globalfilepath[globalfilepathlen] = 0;
/* append a slash if needed */
if (!globalfilepathlen || globalfilepath[globalfilepathlen - 1] != '/') {
if (globalfilepathlen + 1 > MAXPATHLEN) {
globalfilepathlen = 0;
goto globalfileerror;
}
globalfilepath[globalfilepathlen++] = '/';
}
len = strlen(global.server_state_file);
if (globalfilepathlen + len > MAXPATHLEN) {
globalfilepathlen = 0;
goto globalfileerror;
}
memcpy(globalfilepath + globalfilepathlen, global.server_state_file, len);
globalfilepathlen += len;
globalfilepath[globalfilepathlen++] = 0;
}
}
globalfileerror:
if (globalfilepathlen == 0)
globalfilepath[0] = '\0';
/* read servers state from local file */
for (curproxy = proxy; curproxy != NULL; curproxy = curproxy->next) {
/* servers are only in backends */
if (!(curproxy->cap & PR_CAP_BE))
continue;
fileopenerr = 0;
filepath = NULL;
/* search server state file path and name */
switch (curproxy->load_server_state_from_file) {
/* read servers state from global file */
case PR_SRV_STATE_FILE_GLOBAL:
/* there was an error while generating global server state file path */
if (globalfilepathlen == 0)
continue;
filepath = globalfilepath;
fileopenerr = 1;
break;
/* this backend has its own file */
case PR_SRV_STATE_FILE_LOCAL:
localfilepathlen = 0;
localfilepath[0] = '\0';
len = 0;
/* create the localfilepath variable */
/* absolute path or no base directory provided */
if ((curproxy->server_state_file_name[0] == '/') || (!global.server_state_base)) {
len = strlen(curproxy->server_state_file_name);
if (len > MAXPATHLEN) {
localfilepathlen = 0;
goto localfileerror;
}
memcpy(localfilepath, curproxy->server_state_file_name, len);
localfilepath[len] = '\0';
localfilepathlen = len;
}
else if (global.server_state_base) {
len = strlen(global.server_state_base);
localfilepathlen += len;
if (localfilepathlen > MAXPATHLEN) {
localfilepathlen = 0;
goto localfileerror;
}
strncpy(localfilepath, global.server_state_base, len);
localfilepath[localfilepathlen] = 0;
/* append a slash if needed */
if (!localfilepathlen || localfilepath[localfilepathlen - 1] != '/') {
if (localfilepathlen + 1 > MAXPATHLEN) {
localfilepathlen = 0;
goto localfileerror;
}
localfilepath[localfilepathlen++] = '/';
}
len = strlen(curproxy->server_state_file_name);
if (localfilepathlen + len > MAXPATHLEN) {
localfilepathlen = 0;
goto localfileerror;
}
memcpy(localfilepath + localfilepathlen, curproxy->server_state_file_name, len);
localfilepathlen += len;
localfilepath[localfilepathlen++] = 0;
}
filepath = localfilepath;
localfileerror:
if (localfilepathlen == 0)
localfilepath[0] = '\0';
break;
case PR_SRV_STATE_FILE_NONE:
default:
continue;
}
/* preload global state file */
errno = 0;
f = fopen(filepath, "r");
if (errno && fileopenerr)
Warning("Can't open server state file '%s': %s\n", filepath, strerror(errno));
if (!f)
continue;
mybuf[0] = '\0';
mybuflen = 0;
version = 0;
/* first character of first line of the file must contain the version of the export */
if (fgets(mybuf, SRV_STATE_LINE_MAXLEN, f) == NULL) {
Warning("Can't read first line of the server state file '%s'\n", filepath);
goto fileclose;
}
cur = mybuf;
version = atoi(cur);
if ((version < SRV_STATE_FILE_VERSION_MIN) ||
(version > SRV_STATE_FILE_VERSION_MAX))
goto fileclose;
while (fgets(mybuf, SRV_STATE_LINE_MAXLEN, f)) {
int bk_f_forced_id = 0;
int check_id = 0;
int check_name = 0;
mybuflen = strlen(mybuf);
cur = mybuf;
end = cur + mybuflen;
bk = NULL;
srv = NULL;
/* we need at least one character */
if (mybuflen == 0)
continue;
/* ignore blank characters at the beginning of the line */
while (isspace(*cur))
++cur;
if (cur == end)
continue;
/* ignore comment line */
if (*cur == '#')
continue;
/* we're now ready to move the line into *srv_params[] */
params[0] = cur;
arg = 1;
srv_arg = 0;
while (*cur && arg < SRV_STATE_FILE_MAX_FIELDS) {
if (isspace(*cur)) {
*cur = '\0';
++cur;
while (isspace(*cur))
++cur;
switch (version) {
case 1:
/*
* srv_addr: params[4] => srv_params[0]
* srv_op_state: params[5] => srv_params[1]
* srv_admin_state: params[6] => srv_params[2]
* srv_uweight: params[7] => srv_params[3]
* srv_iweight: params[8] => srv_params[4]
* srv_last_time_change: params[9] => srv_params[5]
* srv_check_status: params[10] => srv_params[6]
* srv_check_result: params[11] => srv_params[7]
* srv_check_health: params[12] => srv_params[8]
* srv_check_state: params[13] => srv_params[9]
* srv_agent_state: params[14] => srv_params[10]
* bk_f_forced_id: params[15] => srv_params[11]
* srv_f_forced_id: params[16] => srv_params[12]
*/
if (arg >= 4) {
srv_params[srv_arg] = cur;
++srv_arg;
}
break;
}
params[arg] = cur;
++arg;
}
else {
++cur;
}
}
/* if line is incomplete line, then ignore it.
* otherwise, update useful flags */
switch (version) {
case 1:
if (arg < SRV_STATE_FILE_NB_FIELDS_VERSION_1)
continue;
bk_f_forced_id = (atoi(params[15]) & PR_O_FORCED_ID);
check_id = (atoi(params[0]) == curproxy->uuid);
check_name = (strcmp(curproxy->id, params[1]) == 0);
break;
}
diff = 0;
bk = curproxy;
/* if backend can't be found, let's continue */
if (!check_id && !check_name)
continue;
else if (!check_id && check_name) {
Warning("backend ID mismatch: from server state file: '%s', from running config '%d'\n", params[0], bk->uuid);
send_log(bk, LOG_NOTICE, "backend ID mismatch: from server state file: '%s', from running config '%d'\n", params[0], bk->uuid);
}
else if (check_id && !check_name) {
Warning("backend name mismatch: from server state file: '%s', from running config '%s'\n", params[1], bk->id);
send_log(bk, LOG_NOTICE, "backend name mismatch: from server state file: '%s', from running config '%s'\n", params[1], bk->id);
/* if name doesn't match, we still want to update curproxy if the backend id
* was forced in previous the previous configuration */
if (!bk_f_forced_id)
continue;
}
/* look for the server by its id: param[2] */
/* else look for the server by its name: param[3] */
diff = 0;
srv = server_find_best_match(bk, params[3], atoi(params[2]), &diff);
if (!srv) {
/* if no server found, then warning and continue with next line */
Warning("can't find server '%s' with id '%s' in backend with id '%s' or name '%s'\n",
params[3], params[2], params[0], params[1]);
send_log(bk, LOG_NOTICE, "can't find server '%s' with id '%s' in backend with id '%s' or name '%s'\n",
params[3], params[2], params[0], params[1]);
continue;
}
else if (diff & PR_FBM_MISMATCH_ID) {
Warning("In backend '%s' (id: '%d'): server ID mismatch: from server state file: '%s', from running config %d\n", bk->id, bk->uuid, params[2], srv->puid);
send_log(bk, LOG_NOTICE, "In backend '%s' (id: %d): server ID mismatch: from server state file: '%s', from running config %d\n", bk->id, bk->uuid, params[2], srv->puid);
}
else if (diff & PR_FBM_MISMATCH_NAME) {
Warning("In backend '%s' (id: %d): server name mismatch: from server state file: '%s', from running config '%s'\n", bk->id, bk->uuid, params[3], srv->id);
send_log(bk, LOG_NOTICE, "In backend '%s' (id: %d): server name mismatch: from server state file: '%s', from running config '%s'\n", bk->id, bk->uuid, params[3], srv->id);
}
/* now we can proceed with server's state update */
srv_update_state(srv, version, srv_params);
}
fileclose:
fclose(f);
}
}
/*
* update a server's current IP address.
* ip is a pointer to the new IP address, whose address family is ip_sin_family.
* ip is in network format.
* updater is a string which contains an information about the requester of the update.
* updater is used if not NULL.
*
* A log line and a stderr warning message is generated based on server's backend options.
*/
int update_server_addr(struct server *s, void *ip, int ip_sin_family, const char *updater)
{
/* generates a log line and a warning on stderr */
if (1) {
/* book enough space for both IPv4 and IPv6 */
char oldip[INET6_ADDRSTRLEN];
char newip[INET6_ADDRSTRLEN];
memset(oldip, '\0', INET6_ADDRSTRLEN);
memset(newip, '\0', INET6_ADDRSTRLEN);
/* copy old IP address in a string */
switch (s->addr.ss_family) {
case AF_INET:
inet_ntop(s->addr.ss_family, &((struct sockaddr_in *)&s->addr)->sin_addr, oldip, INET_ADDRSTRLEN);
break;
case AF_INET6:
inet_ntop(s->addr.ss_family, &((struct sockaddr_in6 *)&s->addr)->sin6_addr, oldip, INET6_ADDRSTRLEN);
break;
};
/* copy new IP address in a string */
switch (ip_sin_family) {
case AF_INET:
inet_ntop(ip_sin_family, ip, newip, INET_ADDRSTRLEN);
break;
case AF_INET6:
inet_ntop(ip_sin_family, ip, newip, INET6_ADDRSTRLEN);
break;
};
/* save log line into a buffer */
chunk_printf(&trash, "%s/%s changed its IP from %s to %s by %s",
s->proxy->id, s->id, oldip, newip, updater);
/* write the buffer on stderr */
Warning("%s.\n", trash.str);
/* send a log */
send_log(s->proxy, LOG_NOTICE, "%s.\n", trash.str);
}
/* save the new IP family */
s->addr.ss_family = ip_sin_family;
/* save the new IP address */
switch (ip_sin_family) {
case AF_INET:
((struct sockaddr_in *)&s->addr)->sin_addr.s_addr = *(uint32_t *)ip;
break;
case AF_INET6:
memcpy(((struct sockaddr_in6 *)&s->addr)->sin6_addr.s6_addr, ip, 16);
break;
};
return 0;
}
/*
* update server status based on result of name resolution
* returns:
* 0 if server status is updated
* 1 if server status has not changed
*/
int snr_update_srv_status(struct server *s)
{
struct dns_resolution *resolution = s->resolution;
switch (resolution->status) {
case RSLV_STATUS_NONE:
/* status when HAProxy has just (re)started */
trigger_resolution(s);
break;
default:
break;
}
return 1;
}
/*
* Server Name Resolution valid response callback
* It expects:
* - <nameserver>: the name server which answered the valid response
* - <response>: buffer containing a valid DNS response
* - <response_len>: size of <response>
* It performs the following actions:
* - ignore response if current ip found and server family not met
* - update with first new ip found if family is met and current IP is not found
* returns:
* 0 on error
* 1 when no error or safe ignore
*/
int snr_resolution_cb(struct dns_resolution *resolution, struct dns_nameserver *nameserver, unsigned char *response, int response_len)
{
struct server *s;
void *serverip, *firstip;
short server_sin_family, firstip_sin_family;
unsigned char *response_end;
int ret;
struct chunk *chk = get_trash_chunk();
/* initializing variables */
response_end = response + response_len; /* pointer to mark the end of the response */
firstip = NULL; /* pointer to the first valid response found */
/* it will be used as the new IP if a change is required */
firstip_sin_family = AF_UNSPEC;
serverip = NULL; /* current server IP address */
/* shortcut to the server whose name is being resolved */
s = resolution->requester;
/* initializing server IP pointer */
server_sin_family = s->addr.ss_family;
switch (server_sin_family) {
case AF_INET:
serverip = &((struct sockaddr_in *)&s->addr)->sin_addr.s_addr;
break;
case AF_INET6:
serverip = &((struct sockaddr_in6 *)&s->addr)->sin6_addr.s6_addr;
break;
default:
goto invalid;
}
ret = dns_get_ip_from_response(response, response_end, resolution,
serverip, server_sin_family, &firstip,
&firstip_sin_family);
switch (ret) {
case DNS_UPD_NO:
if (resolution->status != RSLV_STATUS_VALID) {
resolution->status = RSLV_STATUS_VALID;
resolution->last_status_change = now_ms;
}
goto stop_resolution;
case DNS_UPD_SRVIP_NOT_FOUND:
goto save_ip;
case DNS_UPD_CNAME:
if (resolution->status != RSLV_STATUS_VALID) {
resolution->status = RSLV_STATUS_VALID;
resolution->last_status_change = now_ms;
}
goto invalid;
case DNS_UPD_NO_IP_FOUND:
if (resolution->status != RSLV_STATUS_OTHER) {
resolution->status = RSLV_STATUS_OTHER;
resolution->last_status_change = now_ms;
}
goto stop_resolution;
case DNS_UPD_NAME_ERROR:
/* if this is not the last expected response, we ignore it */
if (resolution->nb_responses < nameserver->resolvers->count_nameservers)
return 0;
/* update resolution status to OTHER error type */
if (resolution->status != RSLV_STATUS_OTHER) {
resolution->status = RSLV_STATUS_OTHER;
resolution->last_status_change = now_ms;
}
goto stop_resolution;
default:
goto invalid;
}
save_ip:
nameserver->counters.update += 1;
if (resolution->status != RSLV_STATUS_VALID) {
resolution->status = RSLV_STATUS_VALID;
resolution->last_status_change = now_ms;
}
/* save the first ip we found */
chunk_printf(chk, "%s/%s", nameserver->resolvers->id, nameserver->id);
update_server_addr(s, firstip, firstip_sin_family, (char *)chk->str);
stop_resolution:
/* update last resolution date and time */
resolution->last_resolution = now_ms;
/* reset current status flag */
resolution->step = RSLV_STEP_NONE;
/* reset values */
dns_reset_resolution(resolution);
dns_update_resolvers_timeout(nameserver->resolvers);
snr_update_srv_status(s);
return 0;
invalid:
nameserver->counters.invalid += 1;
if (resolution->nb_responses >= nameserver->resolvers->count_nameservers)
goto stop_resolution;
snr_update_srv_status(s);
return 0;
}
/*
* Server Name Resolution error management callback
* returns:
* 0 on error
* 1 when no error or safe ignore
*/
int snr_resolution_error_cb(struct dns_resolution *resolution, int error_code)
{
struct server *s;
struct dns_resolvers *resolvers;
int res_preferred_afinet, res_preferred_afinet6;
/* shortcut to the server whose name is being resolved */
s = resolution->requester;
resolvers = resolution->resolvers;
/* can be ignored if this is not the last response */
if ((error_code != DNS_RESP_TIMEOUT) && (resolution->nb_responses < resolvers->count_nameservers)) {
return 1;
}
switch (error_code) {
case DNS_RESP_INVALID:
case DNS_RESP_WRONG_NAME:
if (resolution->status != RSLV_STATUS_INVALID) {
resolution->status = RSLV_STATUS_INVALID;
resolution->last_status_change = now_ms;
}
break;
case DNS_RESP_ANCOUNT_ZERO:
case DNS_RESP_TRUNCATED:
case DNS_RESP_ERROR:
case DNS_RESP_NO_EXPECTED_RECORD:
res_preferred_afinet = resolution->opts->family_prio == AF_INET && resolution->query_type == DNS_RTYPE_A;
res_preferred_afinet6 = resolution->opts->family_prio == AF_INET6 && resolution->query_type == DNS_RTYPE_AAAA;
if ((res_preferred_afinet || res_preferred_afinet6)
|| (resolution->try > 0)) {
/* let's change the query type */
if (res_preferred_afinet6) {
/* fallback from AAAA to A */
resolution->query_type = DNS_RTYPE_A;
}
else if (res_preferred_afinet) {
/* fallback from A to AAAA */
resolution->query_type = DNS_RTYPE_AAAA;
}
else {
resolution->try -= 1;
if (resolution->opts->family_prio == AF_INET) {
resolution->query_type = DNS_RTYPE_A;
} else {
resolution->query_type = DNS_RTYPE_AAAA;
}
}
dns_send_query(resolution);
/*
* move the resolution to the last element of the FIFO queue
* and update timeout wakeup based on the new first entry
*/
if (dns_check_resolution_queue(resolvers) > 1) {
/* second resolution becomes first one */
LIST_DEL(&resolution->list);
/* ex first resolution goes to the end of the queue */
LIST_ADDQ(&resolvers->curr_resolution, &resolution->list);
}
dns_update_resolvers_timeout(resolvers);
goto leave;
}
else {
if (resolution->status != RSLV_STATUS_OTHER) {
resolution->status = RSLV_STATUS_OTHER;
resolution->last_status_change = now_ms;
}
}
break;
case DNS_RESP_NX_DOMAIN:
if (resolution->status != RSLV_STATUS_NX) {
resolution->status = RSLV_STATUS_NX;
resolution->last_status_change = now_ms;
}
break;
case DNS_RESP_REFUSED:
if (resolution->status != RSLV_STATUS_REFUSED) {
resolution->status = RSLV_STATUS_REFUSED;
resolution->last_status_change = now_ms;
}
break;
case DNS_RESP_CNAME_ERROR:
break;
case DNS_RESP_TIMEOUT:
if (resolution->status != RSLV_STATUS_TIMEOUT) {
resolution->status = RSLV_STATUS_TIMEOUT;
resolution->last_status_change = now_ms;
}
break;
}
/* update last resolution date and time */
resolution->last_resolution = now_ms;
/* reset current status flag */
resolution->step = RSLV_STEP_NONE;
/* reset values */
dns_reset_resolution(resolution);
LIST_DEL(&resolution->list);
dns_update_resolvers_timeout(resolvers);
leave:
snr_update_srv_status(s);
return 1;
}
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/