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