| /* |
| * 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 <common/buf.h> |
| |
| #include <types/connection.h> |
| #include <types/obj_type.h> |
| #include <types/task.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_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 */ |
| |
| /* 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_PROCERR, /* External process check failure */ |
| HCHK_STATUS_PROCTOUT, /* External process check timeout */ |
| HCHK_STATUS_PROCOK, /* External process check passed */ |
| |
| HCHK_STATUS_SIZE |
| }; |
| |
| /* environment variables memory requirement for different types of data */ |
| #define EXTCHK_SIZE_EVAL_INIT 0 /* size determined during the init phase, |
| * such environment variables are not updatable. */ |
| #define EXTCHK_SIZE_ULONG 20 /* max string length for an unsigned long value */ |
| #define EXTCHK_SIZE_UINT 11 /* max string length for an unsigned int value */ |
| #define EXTCHK_SIZE_ADDR INET6_ADDRSTRLEN+1 /* max string length for an address */ |
| |
| /* external checks environment variables */ |
| enum { |
| EXTCHK_PATH = 0, |
| |
| /* Proxy specific environment variables */ |
| EXTCHK_HAPROXY_PROXY_NAME, /* the backend name */ |
| EXTCHK_HAPROXY_PROXY_ID, /* the backend id */ |
| EXTCHK_HAPROXY_PROXY_ADDR, /* the first bind address if available (or empty) */ |
| EXTCHK_HAPROXY_PROXY_PORT, /* the first bind port if available (or empty) */ |
| |
| /* Server specific environment variables */ |
| EXTCHK_HAPROXY_SERVER_NAME, /* the server name */ |
| EXTCHK_HAPROXY_SERVER_ID, /* the server id */ |
| EXTCHK_HAPROXY_SERVER_ADDR, /* the server address */ |
| EXTCHK_HAPROXY_SERVER_PORT, /* the server port if available (or empty) */ |
| EXTCHK_HAPROXY_SERVER_MAXCONN, /* the server max connections */ |
| EXTCHK_HAPROXY_SERVER_CURCONN, /* the current number of connections on the server */ |
| |
| EXTCHK_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 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 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 */ |
| 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 list *tcpcheck_rules; /* tcp-check send / expect rules */ |
| struct tcpcheck_rule *current_step; /* current step when using tcpcheck */ |
| struct tcpcheck_rule *last_started_step;/* pointer to latest tcpcheck rule started */ |
| 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 */ |
| int send_string_len; /* length of agent command string */ |
| char *send_string; /* optionally send a string when connecting to the agent */ |
| 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 */ |
| |
| int via_socks4; /* check the connection via socks4 proxy */ |
| }; |
| |
| struct check_status { |
| short result; /* one of SRV_CHK_* */ |
| char *info; /* human readable short info */ |
| char *desc; /* long description */ |
| }; |
| |
| struct extcheck_env { |
| char *name; /* environment variable name */ |
| int vmaxlen; /* value maximum length, used to determine the required memory allocation */ |
| }; |
| |
| 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 tcpcheck_rule_type { |
| TCPCHK_ACT_SEND = 0, /* send action, regular string format */ |
| TCPCHK_ACT_EXPECT, /* expect action, either regular or binary string */ |
| TCPCHK_ACT_CONNECT, /* connect action, to probe a new port */ |
| TCPCHK_ACT_COMMENT, /* no action, simply a comment used for logs */ |
| }; |
| |
| /* flags used by tcpcheck_rule->conn_opts */ |
| #define TCPCHK_OPT_NONE 0x0000 /* no options specified, default */ |
| #define TCPCHK_OPT_SEND_PROXY 0x0001 /* send proxy-protocol string */ |
| #define TCPCHK_OPT_SSL 0x0002 /* SSL connection */ |
| #define TCPCHK_OPT_LINGER 0x0004 /* Do not RST connection, let it linger */ |
| |
| struct tcpcheck_rule { |
| struct list list; /* list linked to from the proxy */ |
| enum tcpcheck_rule_type action; /* type of the rule. */ |
| char *comment; /* comment to be used in the logs and on the stats socket */ |
| /* 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 length */ |
| int min_recv; /* Minimum amount of data before an expect can be applied. (default: -1, ignored) */ |
| struct my_regex *expect_regex; /* expected */ |
| int inverse; /* 0 = regular match, 1 = inverse match */ |
| unsigned short port; /* port to connect to */ |
| unsigned short conn_opts; /* options when setting up a new connection */ |
| struct tcpcheck_rule *expect_head; /* first expect of a chain. */ |
| }; |
| |
| #endif /* _TYPES_CHECKS_H */ |