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411 lines
20 KiB
411 lines
20 KiB
/*
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* include/haproxy/server-t.h
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* This file defines everything related to servers.
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*
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* Copyright (C) 2000-2012 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_SERVER_T_H
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#define _HAPROXY_SERVER_T_H
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <import/eb32tree.h>
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#include <import/ebmbtree.h>
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#include <haproxy/api-t.h>
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#include <haproxy/check-t.h>
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#include <haproxy/connection-t.h>
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#include <haproxy/counters-t.h>
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#include <haproxy/dns-t.h>
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#include <haproxy/freq_ctr-t.h>
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#include <haproxy/listener-t.h>
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#include <haproxy/obj_type-t.h>
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#include <haproxy/openssl-compat.h>
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#include <haproxy/ssl_sock-t.h>
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#include <haproxy/stats-t.h>
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#include <haproxy/task-t.h>
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#include <haproxy/thread-t.h>
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#include <haproxy/xprt_quic-t.h>
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/* server states. Only SRV_ST_STOPPED indicates a down server. */
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enum srv_state {
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SRV_ST_STOPPED = 0, /* the server is down. Please keep set to zero. */
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SRV_ST_STARTING, /* the server is warming up (up but throttled) */
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SRV_ST_RUNNING, /* the server is fully up */
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SRV_ST_STOPPING, /* the server is up but soft-stopping (eg: 404) */
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} __attribute__((packed));
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/* Administrative status : a server runs in one of these 3 stats :
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* - READY : normal mode
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* - DRAIN : takes no new visitor, equivalent to weight == 0
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* - MAINT : maintenance mode, no more traffic nor health checks.
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*
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* Each server may be in maintenance by itself or may inherit this status from
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* another server it tracks. It can also be in drain mode by itself or inherit
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* it from another server. Let's store these origins here as flags. These flags
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* are combined this way :
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*
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* FMAINT IMAINT FDRAIN IDRAIN Resulting state
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* 0 0 0 0 READY
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* 0 0 0 1 DRAIN
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* 0 0 1 x DRAIN
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* 0 1 x x MAINT
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* 1 x x x MAINT
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*
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* This can be simplified this way :
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*
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* state_str = (state & MAINT) ? "MAINT" : (state & DRAIN) : "DRAIN" : "READY"
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*/
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enum srv_admin {
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SRV_ADMF_FMAINT = 0x01, /* the server was explicitly forced into maintenance */
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SRV_ADMF_IMAINT = 0x02, /* the server has inherited the maintenance status from a tracked server */
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SRV_ADMF_MAINT = 0x23, /* mask to check if any maintenance flag is present */
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SRV_ADMF_CMAINT = 0x04, /* the server is in maintenance because of the configuration */
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SRV_ADMF_FDRAIN = 0x08, /* the server was explicitly forced into drain state */
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SRV_ADMF_IDRAIN = 0x10, /* the server has inherited the drain status from a tracked server */
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SRV_ADMF_DRAIN = 0x18, /* mask to check if any drain flag is present */
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SRV_ADMF_RMAINT = 0x20, /* the server is down because of an IP address resolution failure */
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SRV_ADMF_HMAINT = 0x40, /* the server FQDN has been set from socket stats */
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} __attribute__((packed));
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/* options for servers' "init-addr" parameter
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* this parameter may be used to drive HAProxy's behavior when parsing a server
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* address at start up time.
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* These values are stored as a list into an integer ordered from first to last
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* starting with the lowest to highest bits. SRV_IADDR_END (0) is used to
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* indicate the end of the list. 3 bits are enough to store each value.
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*/
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enum srv_initaddr {
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SRV_IADDR_END = 0, /* end of the list */
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SRV_IADDR_NONE = 1, /* the server won't have any address at start up */
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SRV_IADDR_LIBC = 2, /* address set using the libc DNS resolver */
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SRV_IADDR_LAST = 3, /* we set the IP address found in state-file for this server */
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SRV_IADDR_IP = 4, /* we set an arbitrary IP address to the server */
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} __attribute__((packed));
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/* server-state-file version */
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#define SRV_STATE_FILE_VERSION 1
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#define SRV_STATE_FILE_VERSION_MIN 1
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#define SRV_STATE_FILE_VERSION_MAX 1
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#define SRV_STATE_FILE_FIELD_NAMES \
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"be_id " \
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"be_name " \
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"srv_id " \
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"srv_name " \
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"srv_addr " \
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"srv_op_state " \
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"srv_admin_state " \
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"srv_uweight " \
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"srv_iweight " \
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"srv_time_since_last_change " \
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"srv_check_status " \
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"srv_check_result " \
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"srv_check_health " \
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"srv_check_state " \
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"srv_agent_state " \
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"bk_f_forced_id " \
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"srv_f_forced_id " \
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"srv_fqdn " \
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"srv_port " \
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"srvrecord " \
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"srv_use_ssl"
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#define SRV_STATE_FILE_MAX_FIELDS 21
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#define SRV_STATE_FILE_NB_FIELDS_VERSION_1 20
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#define SRV_STATE_LINE_MAXLEN 512
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/* server flags -- 32 bits */
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#define SRV_F_BACKUP 0x0001 /* this server is a backup server */
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#define SRV_F_MAPPORTS 0x0002 /* this server uses mapped ports */
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#define SRV_F_NON_STICK 0x0004 /* never add connections allocated to this server to a stick table */
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#define SRV_F_USE_NS_FROM_PP 0x0008 /* use namespace associated with connection if present */
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#define SRV_F_FORCED_ID 0x0010 /* server's ID was forced in the configuration */
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#define SRV_F_CHECKADDR 0x0020 /* this server has a check addr configured */
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#define SRV_F_CHECKPORT 0x0040 /* this server has a check port configured */
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#define SRV_F_AGENTADDR 0x0080 /* this server has a agent addr configured */
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#define SRV_F_COOKIESET 0x0100 /* this server has a cookie configured, so don't generate dynamic cookies */
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#define SRV_F_FASTOPEN 0x0200 /* Use TCP Fast Open to connect to server */
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#define SRV_F_SOCKS4_PROXY 0x0400 /* this server uses SOCKS4 proxy */
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#define SRV_F_NO_RESOLUTION 0x0800 /* disable runtime DNS resolution on this server */
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/* configured server options for send-proxy (server->pp_opts) */
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#define SRV_PP_V1 0x0001 /* proxy protocol version 1 */
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#define SRV_PP_V2 0x0002 /* proxy protocol version 2 */
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#define SRV_PP_V2_SSL 0x0004 /* proxy protocol version 2 with SSL */
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#define SRV_PP_V2_SSL_CN 0x0008 /* proxy protocol version 2 with CN */
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#define SRV_PP_V2_SSL_KEY_ALG 0x0010 /* proxy protocol version 2 with cert key algorithm */
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#define SRV_PP_V2_SSL_SIG_ALG 0x0020 /* proxy protocol version 2 with cert signature algorithm */
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#define SRV_PP_V2_SSL_CIPHER 0x0040 /* proxy protocol version 2 with cipher used */
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#define SRV_PP_V2_AUTHORITY 0x0080 /* proxy protocol version 2 with authority */
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#define SRV_PP_V2_CRC32C 0x0100 /* proxy protocol version 2 with crc32c */
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#define SRV_PP_V2_UNIQUE_ID 0x0200 /* proxy protocol version 2 with unique ID */
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/* function which act on servers need to return various errors */
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#define SRV_STATUS_OK 0 /* everything is OK. */
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#define SRV_STATUS_INTERNAL 1 /* other unrecoverable errors. */
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#define SRV_STATUS_NOSRV 2 /* no server is available */
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#define SRV_STATUS_FULL 3 /* the/all server(s) are saturated */
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#define SRV_STATUS_QUEUED 4 /* the/all server(s) are saturated but the connection was queued */
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/* various constants */
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#define SRV_UWGHT_RANGE 256
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#define SRV_UWGHT_MAX (SRV_UWGHT_RANGE)
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#define SRV_EWGHT_RANGE (SRV_UWGHT_RANGE * BE_WEIGHT_SCALE)
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#define SRV_EWGHT_MAX (SRV_UWGHT_MAX * BE_WEIGHT_SCALE)
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/* server ssl options */
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#define SRV_SSL_O_NONE 0x0000
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#define SRV_SSL_O_NO_TLS_TICKETS 0x0100 /* disable session resumption tickets */
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#define SRV_SSL_O_NO_REUSE 0x200 /* disable session reuse */
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#define SRV_SSL_O_EARLY_DATA 0x400 /* Allow using early data */
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/* log servers ring's protocols options */
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enum srv_log_proto {
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SRV_LOG_PROTO_LEGACY, // messages on TCP separated by LF
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SRV_LOG_PROTO_OCTET_COUNTING, // TCP frames: MSGLEN SP MSG
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};
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struct pid_list {
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struct list list;
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pid_t pid;
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struct task *t;
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int status;
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int exited;
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};
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/* A tree occurrence is a descriptor of a place in a tree, with a pointer back
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* to the server itself.
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*/
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struct server;
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struct tree_occ {
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struct server *server;
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struct eb32_node node;
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};
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struct proxy;
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struct server {
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enum obj_type obj_type; /* object type == OBJ_TYPE_SERVER */
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enum srv_state next_state, cur_state; /* server state among SRV_ST_* */
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enum srv_admin next_admin, cur_admin; /* server maintenance status : SRV_ADMF_* */
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signed char use_ssl; /* ssl enabled (1: on, 0: disabled, -1 forced off) */
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unsigned int pp_opts; /* proxy protocol options (SRV_PP_*) */
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struct server *next;
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int cklen; /* the len of the cookie, to speed up checks */
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int rdr_len; /* the length of the redirection prefix */
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char *cookie; /* the id set in the cookie */
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char *rdr_pfx; /* the redirection prefix */
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struct proxy *proxy; /* the proxy this server belongs to */
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const struct mux_proto_list *mux_proto; /* the mux to use for all outgoing connections (specified by the "proto" keyword) */
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int served; /* # of active sessions currently being served (ie not pending) */
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int cur_sess; /* number of currently active sessions (including syn_sent) */
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unsigned maxconn, minconn; /* max # of active sessions (0 = unlimited), min# for dynamic limit. */
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int nbpend; /* number of pending connections */
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unsigned int queue_idx; /* count of pending connections which have been de-queued */
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int maxqueue; /* maximum number of pending connections allowed */
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struct freq_ctr sess_per_sec; /* sessions per second on this server */
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struct be_counters counters; /* statistics counters */
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struct eb_root pendconns; /* pending connections */
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struct list actconns; /* active connections */
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struct mt_list *idle_conns; /* shareable idle connections*/
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struct mt_list *safe_conns; /* safe idle connections */
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struct list *available_conns; /* Connection in used, but with still new streams available */
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unsigned int pool_purge_delay; /* Delay before starting to purge the idle conns pool */
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unsigned int low_idle_conns; /* min idle connection count to start picking from other threads */
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unsigned int max_idle_conns; /* Max number of connection allowed in the orphan connections list */
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unsigned int curr_idle_conns; /* Current number of orphan idling connections, both the idle and the safe lists */
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unsigned int curr_idle_nb; /* Current number of connections in the idle list */
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unsigned int curr_safe_nb; /* Current number of connections in the safe list */
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unsigned int curr_used_conns; /* Current number of used connections */
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unsigned int max_used_conns; /* Max number of used connections (the counter is reset at each connection purges */
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unsigned int est_need_conns; /* Estimate on the number of needed connections (max of curr and previous max_used) */
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unsigned int next_takeover; /* thread ID to try to steal connections from next time */
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unsigned int *curr_idle_thr; /* Current number of orphan idling connections per thread */
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int max_reuse; /* Max number of requests on a same connection */
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__decl_thread(HA_SPINLOCK_T lock); /* may enclose the proxy's lock, must not be taken under */
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struct eb32_node idle_node; /* When to next do cleanup in the idle connections */
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struct task *warmup; /* the task dedicated to the warmup when slowstart is set */
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struct conn_src conn_src; /* connection source settings */
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struct server *track; /* the server we're currently tracking, if any */
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struct server *trackers; /* the list of servers tracking us, if any */
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struct server *tracknext; /* next server tracking <track> in <track>'s trackers list */
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char *trackit; /* temporary variable to make assignment deferrable */
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int consecutive_errors; /* current number of consecutive errors */
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int consecutive_errors_limit; /* number of consecutive errors that triggers an event */
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short observe, onerror; /* observing mode: one of HANA_OBS_*; what to do on error: on of ANA_ONERR_* */
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short onmarkeddown; /* what to do when marked down: one of HANA_ONMARKEDDOWN_* */
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short onmarkedup; /* what to do when marked up: one of HANA_ONMARKEDUP_* */
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unsigned int flags; /* server flags (SRV_F_*) */
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int slowstart; /* slowstart time in seconds (ms in the conf) */
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char *id; /* just for identification */
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unsigned iweight,uweight, cur_eweight; /* initial weight, user-specified weight, and effective weight */
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unsigned wscore; /* weight score, used during srv map computation */
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unsigned next_eweight; /* next pending eweight to commit */
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unsigned rweight; /* remainer of weight in the current LB tree */
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unsigned cumulative_weight; /* weight of servers prior to this one in the same group, for chash balancing */
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unsigned npos, lpos; /* next and last positions in the LB tree */
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struct eb32_node lb_node; /* node used for tree-based load balancing */
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struct eb_root *lb_tree; /* we want to know in what tree the server is */
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struct server *next_full; /* next server in the temporary full list */
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unsigned lb_nodes_tot; /* number of allocated lb_nodes (C-HASH) */
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unsigned lb_nodes_now; /* number of lb_nodes placed in the tree (C-HASH) */
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struct tree_occ *lb_nodes; /* lb_nodes_tot * struct tree_occ */
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const struct netns_entry *netns; /* contains network namespace name or NULL. Network namespace comes from configuration */
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/* warning, these structs are huge, keep them at the bottom */
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struct sockaddr_storage addr; /* the address to connect to, doesn't include the port */
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struct xprt_ops *xprt; /* transport-layer operations */
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unsigned int svc_port; /* the port to connect to (for relevant families) */
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unsigned down_time; /* total time the server was down */
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time_t last_change; /* last time, when the state was changed */
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int puid; /* proxy-unique server ID, used for SNMP, and "first" LB algo */
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int tcp_ut; /* for TCP, user timeout */
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int do_check; /* temporary variable used during parsing to denote if health checks must be enabled */
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int do_agent; /* temporary variable used during parsing to denote if an auxiliary agent check must be enabled */
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struct check check; /* health-check specific configuration */
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struct check agent; /* agent specific configuration */
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struct dns_requester *dns_requester; /* used to link a server to its DNS resolution */
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char *resolvers_id; /* resolvers section used by this server */
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struct dns_resolvers *resolvers; /* pointer to the resolvers structure used by this server */
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char *lastaddr; /* the address string provided by the server-state file */
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struct dns_options dns_opts;
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int hostname_dn_len; /* string length of the server hostname in Domain Name format */
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char *hostname_dn; /* server hostname in Domain Name format */
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char *hostname; /* server hostname */
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struct sockaddr_storage init_addr; /* plain IP address specified on the init-addr line */
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unsigned int init_addr_methods; /* initial address setting, 3-bit per method, ends at 0, enough to store 10 entries */
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enum srv_log_proto log_proto; /* used proto to emit messages on server lines from ring section */
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#ifdef USE_OPENSSL
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char *sni_expr; /* Temporary variable to store a sample expression for SNI */
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struct {
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SSL_CTX *ctx;
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struct {
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unsigned char *ptr;
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int size;
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int allocated_size;
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} * reused_sess;
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char *ciphers; /* cipher suite to use if non-null */
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#ifdef HAVE_SSL_CTX_SET_CIPHERSUITES
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char *ciphersuites; /* TLS 1.3 cipher suite to use if non-null */
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#endif
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int options; /* ssl options */
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int verify; /* verify method (set of SSL_VERIFY_* flags) */
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struct tls_version_filter methods; /* ssl methods */
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char *verify_host; /* hostname of certificate must match this host */
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char *ca_file; /* CAfile to use on verify */
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char *crl_file; /* CRLfile to use on verify */
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char *client_crt; /* client certificate to send */
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struct sample_expr *sni; /* sample expression for SNI */
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#ifdef OPENSSL_NPN_NEGOTIATED
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char *npn_str; /* NPN protocol string */
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int npn_len; /* NPN protocol string length */
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#endif
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#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
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char *alpn_str; /* ALPN protocol string */
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int alpn_len; /* ALPN protocol string length */
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#endif
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} ssl_ctx;
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#ifdef USE_QUIC
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struct quic_transport_params quic_params; /* QUIC transport parameters */
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struct eb_root cids; /* QUIC connections IDs. */
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#endif
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#endif
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struct dns_srvrq *srvrq; /* Pointer representing the DNS SRV requeest, if any */
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struct {
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const char *file; /* file where the section appears */
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struct eb32_node id; /* place in the tree of used IDs */
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struct ebpt_node name; /* place in the tree of used names */
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int line; /* line where the section appears */
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} conf; /* config information */
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struct ebpt_node addr_node; /* Node for string representation of address for the server (including port number) */
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/* Template information used only for server objects which
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* serve as template filled at parsing time and used during
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* server allocations from server templates.
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*/
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struct {
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char *prefix;
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int nb_low;
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int nb_high;
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} tmpl_info;
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struct {
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long duration;
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short status, code;
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char reason[128];
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} op_st_chg; /* operational status change's reason */
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char adm_st_chg_cause[48]; /* administrative status change's cause */
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struct sockaddr_storage socks4_addr; /* the address of the SOCKS4 Proxy, including the port */
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EXTRA_COUNTERS(extra_counters);
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};
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/* Storage structure to load server-state lines from a flat file into
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* an ebtree, for faster processing
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*/
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struct state_line {
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char *line;
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struct ebmb_node name_name;
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/* WARNING don't put anything after name_name, it's used by the key */
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};
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/* Descriptor for a "server" keyword. The ->parse() function returns 0 in case of
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* success, or a combination of ERR_* flags if an error is encountered. The
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* function pointer can be NULL if not implemented. The function also has an
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* access to the current "server" config line. The ->skip value tells the parser
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* how many words have to be skipped after the keyword. If the function needs to
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* parse more keywords, it needs to update cur_arg.
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*/
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struct srv_kw {
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const char *kw;
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int (*parse)(char **args, int *cur_arg, struct proxy *px, struct server *srv, char **err);
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int skip; /* nb min of args to skip, for use when kw is not handled */
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int default_ok; /* non-zero if kw is supported in default-server section */
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};
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/*
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* A keyword list. It is a NULL-terminated array of keywords. It embeds a
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* struct list in order to be linked to other lists, allowing it to easily
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* be declared where it is needed, and linked without duplicating data nor
|
|
* allocating memory. It is also possible to indicate a scope for the keywords.
|
|
*/
|
|
struct srv_kw_list {
|
|
const char *scope;
|
|
struct list list;
|
|
struct srv_kw kw[VAR_ARRAY];
|
|
};
|
|
|
|
#endif /* _HAPROXY_SERVER_T_H */
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-indent-level: 8
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|
|
|