| /* |
| * Health-checks. |
| * |
| * Copyright 2008-2009 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. |
| * |
| */ |
| |
| #ifndef _TYPES_CHECKS_H |
| #define _TYPES_CHECKS_H |
| |
| #include <sys/time.h> |
| |
| #include <common/config.h> |
| #include <common/mini-clist.h> |
| #include <common/regex.h> |
| |
| #include <types/connection.h> |
| #include <types/obj_type.h> |
| #include <types/task.h> |
| #include <types/server.h> |
| |
| /* 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_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 */ |
| |
| /* check status */ |
| enum { |
| 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_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 check { |
| struct connection *conn; /* connection state for health checks */ |
| unsigned short port; /* the port to use for the health checks */ |
| struct buffer *bi, *bo; /* input and output buffers to send/recv check */ |
| 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 */ |
| char desc[HCHK_DESC_LEN]; /* health check descritpion */ |
| int use_ssl; /* use SSL for health checks */ |
| int send_proxy; /* send a PROXY protocol header with checks */ |
| 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 check_status { |
| short result; /* one of SRV_CHK_* */ |
| char *info; /* human readable short info */ |
| char *desc; /* long description */ |
| }; |
| |
| struct analyze_status { |
| char *desc; /* description */ |
| unsigned char lr[HANA_OBS_SIZE]; /* result for l4/l7: 0 = ignore, 1 - error, 2 - OK */ |
| }; |
| |
| /* possible actions for tcpcheck_rule->action */ |
| enum { |
| TCPCHK_ACT_SEND = 0, /* send action, regular string format */ |
| TCPCHK_ACT_EXPECT, /* expect action, either regular or binary string */ |
| }; |
| |
| struct tcpcheck_rule { |
| struct list list; /* list linked to from the proxy */ |
| int action; /* action: send or expect */ |
| /* match type uses NON-NULL pointer from either string or expect_regex below */ |
| /* sent string is string */ |
| char *string; /* sent or expected string */ |
| int string_len; /* string lenght */ |
| regex_t *expect_regex; /* expected */ |
| int inverse; /* 0 = regular match, 1 = inverse match */ |
| }; |
| |
| #endif /* _TYPES_CHECKS_H */ |