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183 lines
7.5 KiB
183 lines
7.5 KiB
/*
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* include/haproxy/check-t.h
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* Health-checks definitions, enums, macros and bitfields.
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*
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* Copyright 2008-2009 Krzysztof Piotr Oledzki <ole@ans.pl>
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* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#ifndef _HAPROXY_CHECKS_T_H
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#define _HAPROXY_CHECKS_T_H
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#include <import/ebpttree.h>
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#include <import/ist.h>
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#include <haproxy/api-t.h>
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#include <haproxy/buf-t.h>
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#include <haproxy/connection-t.h>
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#include <haproxy/dynbuf-t.h>
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#include <haproxy/obj_type-t.h>
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#include <haproxy/vars-t.h>
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/* Please note: this file tends to commonly be part of circular dependencies,
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* so it is important to keep its includes list to the minimum possible (i.e.
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* only types whose size needs to be known). Since there are no function
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* prototypes nor pointers here, forward declarations are not really necessary.
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* This file oughtt to be split into multiple parts, at least regular checks vs
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* tcp-checks.
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*/
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/* enum used by check->result. Must remain in this order, as some code uses
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* result >= CHK_RES_PASSED to declare success.
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*/
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enum chk_result {
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CHK_RES_UNKNOWN = 0, /* initialized to this by default */
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CHK_RES_NEUTRAL, /* valid check but no status information */
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CHK_RES_FAILED, /* check failed */
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CHK_RES_PASSED, /* check succeeded and server is fully up again */
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CHK_RES_CONDPASS, /* check reports the server doesn't want new sessions */
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};
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/* flags used by check->state */
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#define CHK_ST_INPROGRESS 0x0001 /* a check is currently running */
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#define CHK_ST_CONFIGURED 0x0002 /* this check is configured and may be enabled */
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#define CHK_ST_ENABLED 0x0004 /* this check is currently administratively enabled */
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#define CHK_ST_PAUSED 0x0008 /* checks are paused because of maintenance (health only) */
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#define CHK_ST_AGENT 0x0010 /* check is an agent check (otherwise it's a health check) */
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#define CHK_ST_PORT_MISS 0x0020 /* check can't be send because no port is configured to run it */
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#define CHK_ST_IN_ALLOC 0x0040 /* check blocked waiting for input buffer allocation */
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#define CHK_ST_OUT_ALLOC 0x0080 /* check blocked waiting for output buffer allocation */
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/* check status */
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enum healthcheck_status {
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HCHK_STATUS_UNKNOWN = 0, /* Unknown */
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HCHK_STATUS_INI, /* Initializing */
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HCHK_STATUS_START, /* Check started - SPECIAL STATUS */
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/* Below we have finished checks */
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HCHK_STATUS_CHECKED, /* DUMMY STATUS */
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HCHK_STATUS_HANA, /* Health analyze detected enough consecutive errors */
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HCHK_STATUS_SOCKERR, /* Socket error */
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HCHK_STATUS_L4OK, /* L4 check passed, for example tcp connect */
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HCHK_STATUS_L4TOUT, /* L4 timeout */
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HCHK_STATUS_L4CON, /* L4 connection problem, for example: */
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/* "Connection refused" (tcp rst) or "No route to host" (icmp) */
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HCHK_STATUS_L6OK, /* L6 check passed */
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HCHK_STATUS_L6TOUT, /* L6 (SSL) timeout */
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HCHK_STATUS_L6RSP, /* L6 invalid response - protocol error */
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HCHK_STATUS_L7TOUT, /* L7 (HTTP/SMTP) timeout */
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HCHK_STATUS_L7RSP, /* L7 invalid response - protocol error */
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/* Below we have layer 5-7 data available */
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HCHK_STATUS_L57DATA, /* DUMMY STATUS */
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HCHK_STATUS_L7OKD, /* L7 check passed */
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HCHK_STATUS_L7OKCD, /* L7 check conditionally passed */
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HCHK_STATUS_L7STS, /* L7 response error, for example HTTP 5xx */
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HCHK_STATUS_PROCERR, /* External process check failure */
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HCHK_STATUS_PROCTOUT, /* External process check timeout */
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HCHK_STATUS_PROCOK, /* External process check passed */
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HCHK_STATUS_SIZE
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};
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/* health status for response tracking */
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enum {
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HANA_STATUS_UNKNOWN = 0,
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HANA_STATUS_L4_OK, /* L4 successful connection */
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HANA_STATUS_L4_ERR, /* L4 unsuccessful connection */
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HANA_STATUS_HTTP_OK, /* Correct http response */
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HANA_STATUS_HTTP_STS, /* Wrong http response, for example HTTP 5xx */
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HANA_STATUS_HTTP_HDRRSP, /* Invalid http response (headers) */
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HANA_STATUS_HTTP_RSP, /* Invalid http response */
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HANA_STATUS_HTTP_READ_ERROR, /* Read error */
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HANA_STATUS_HTTP_READ_TIMEOUT, /* Read timeout */
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HANA_STATUS_HTTP_BROKEN_PIPE, /* Unexpected close from server */
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HANA_STATUS_SIZE
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};
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enum {
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HANA_ONERR_UNKNOWN = 0,
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HANA_ONERR_FASTINTER, /* Force fastinter*/
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HANA_ONERR_FAILCHK, /* Simulate a failed check */
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HANA_ONERR_SUDDTH, /* Enters sudden death - one more failed check will mark this server down */
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HANA_ONERR_MARKDWN, /* Mark this server down, now! */
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};
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enum {
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HANA_ONMARKEDDOWN_NONE = 0,
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HANA_ONMARKEDDOWN_SHUTDOWNSESSIONS, /* Shutdown peer sessions */
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};
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enum {
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HANA_ONMARKEDUP_NONE = 0,
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HANA_ONMARKEDUP_SHUTDOWNBACKUPSESSIONS, /* Shutdown peer sessions */
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};
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enum {
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HANA_OBS_NONE = 0,
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HANA_OBS_LAYER4, /* Observe L4 - for example tcp */
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HANA_OBS_LAYER7, /* Observe L7 - for example http */
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HANA_OBS_SIZE
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};
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struct tcpcheck_rule;
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struct tcpcheck_rules;
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struct check {
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enum obj_type obj_type; /* object type == OBJ_TYPE_CHECK */
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struct session *sess; /* Health check session. */
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struct vars vars; /* Health check dynamic variables. */
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struct xprt_ops *xprt; /* transport layer operations for health checks */
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struct conn_stream *cs; /* conn_stream state for health checks */
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struct buffer bi, bo; /* input and output buffers to send/recv check */
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struct buffer_wait buf_wait; /* Wait list for buffer allocation */
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struct task *task; /* the task associated to the health check processing, NULL if disabled */
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struct timeval start; /* last health check start time */
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long duration; /* time in ms took to finish last health check */
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short status, code; /* check result, check code */
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unsigned short port; /* the port to use for the health checks */
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char desc[HCHK_DESC_LEN]; /* health check description */
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signed char use_ssl; /* use SSL for health checks (1: on, 0: server mode, -1: off) */
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int send_proxy; /* send a PROXY protocol header with checks */
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struct tcpcheck_rules *tcpcheck_rules; /* tcp-check send / expect rules */
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struct tcpcheck_rule *current_step; /* current step when using tcpcheck */
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int inter, fastinter, downinter; /* checks: time in milliseconds */
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enum chk_result result; /* health-check result : CHK_RES_* */
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int state; /* state of the check : CHK_ST_* */
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int health; /* 0 to rise-1 = bad;
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* rise to rise+fall-1 = good */
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int rise, fall; /* time in iterations */
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int type; /* Check type, one of PR_O2_*_CHK */
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struct server *server; /* back-pointer to server */
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struct proxy *proxy; /* proxy to be used */
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char **argv; /* the arguments to use if running a process-based check */
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char **envp; /* the environment to use if running a process-based check */
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struct pid_list *curpid; /* entry in pid_list used for current process-based test, or -1 if not in test */
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struct sockaddr_storage addr; /* the address to check */
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struct wait_event wait_list; /* Waiting for I/O events */
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char *sni; /* Server name */
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char *alpn_str; /* ALPN to use for checks */
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int alpn_len; /* ALPN string length */
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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 via_socks4; /* check the connection via socks4 proxy */
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};
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#endif /* _HAPROXY_CHECKS_T_H */
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