haproxy/include/common/defaults.h

/*
 * include/common/defaults.h
 * Miscellaneous default values.
 *
 * Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, version 2.1
 * exclusively.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef _COMMON_DEFAULTS_H
#define _COMMON_DEFAULTS_H

/*
 * BUFSIZE defines the size of a read and write buffer. It is the maximum
 * amount of bytes which can be stored by the proxy for each session. However,
 * when reading HTTP headers, the proxy needs some spare space to add or rewrite
 * headers if needed. The size of this spare is defined with MAXREWRITE. So it
 * is not possible to process headers longer than BUFSIZE-MAXREWRITE bytes. By
 * default, BUFSIZE=16384 bytes and MAXREWRITE=BUFSIZE/2, so the maximum length
 * of headers accepted is 8192 bytes, which is in line with Apache's limits.
 */
#ifndef BUFSIZE
#define BUFSIZE	        16384
#endif

// reserved buffer space for header rewriting
#ifndef MAXREWRITE
#define MAXREWRITE      (BUFSIZE / 2)
#endif

#define REQURI_LEN      1024
#define CAPTURE_LEN     64

// maximum line size when parsing config
#ifndef LINESIZE
#define LINESIZE	2048
#endif

// max # args on a configuration line
#define MAX_LINE_ARGS   64

// max # args on a stats socket
#define MAX_STATS_ARGS  16

// max # of matches per regexp
#define	MAX_MATCH       10

// max # of headers in one HTTP request or response
// By default, about 100 headers per 8 kB.
#ifndef MAX_HTTP_HDR
#define MAX_HTTP_HDR    ((BUFSIZE+79)/80)
#endif

// max # of loops we can perform around a read() which succeeds.
// It's very frequent that the system returns a few TCP segments at a time.
#ifndef MAX_READ_POLL_LOOPS
#define MAX_READ_POLL_LOOPS 4
#endif

// minimum number of bytes read at once above which we don't try to read
// more, in order not to risk facing an EAGAIN. Most often, if we read
// at least 10 kB, we can consider that the system has tried to read a
// full buffer and got multiple segments (>1 MSS for jumbo frames, >7 MSS
// for normal frames) did not bother truncating the last segment.
#ifndef MIN_RECV_AT_ONCE_ENOUGH
#define MIN_RECV_AT_ONCE_ENOUGH (7*1448)
#endif

// same, but for writes. Generally, it's enough to write twice: one time for
// first half of the buffer, and a second time for the last half after a
// wrap-around.
#ifndef MAX_WRITE_POLL_LOOPS
#define MAX_WRITE_POLL_LOOPS 2
#endif

// the number of bytes returned by a read below which we will not try to
// poll the socket again. Generally, return values below the MSS are worthless
// to try again.
#ifndef MIN_RET_FOR_READ_LOOP
#define MIN_RET_FOR_READ_LOOP 1460
#endif

// the max number of events returned in one call to poll/epoll. Too small a
// value will cause lots of calls, and too high a value may cause high latency.
#ifndef MAX_POLL_EVENTS
#define MAX_POLL_EVENTS 200
#endif

// cookie delimitor in "prefix" mode. This character is inserted between the
// persistence cookie and the original value. The '~' is allowed by RFC2965,
// and should not be too common in server names.
#ifndef COOKIE_DELIM
#define COOKIE_DELIM    '~'
#endif

#define CONN_RETRIES    3

#define	CHK_CONNTIME    2000
#define	DEF_CHKINTR     2000
#define DEF_FALLTIME    3
#define DEF_RISETIME    2
#define DEF_CHECK_REQ   "OPTIONS / HTTP/1.0\r\n"
#define DEF_SMTP_CHECK_REQ   "HELO localhost\r\n"

#define DEF_HANA_ONERR		HANA_ONERR_FAILCHK
#define DEF_HANA_ERRLIMIT	10

// X-Forwarded-For header default
#define DEF_XFORWARDFOR_HDR	"X-Forwarded-For"

// X-Original-To header default
#define DEF_XORIGINALTO_HDR	"X-Original-To"

/* Default connections limit.
 *
 * A system limit can be enforced at build time in order to avoid using haproxy
 * beyond reasonable system limits. For this, just define SYSTEM_MAXCONN to the
 * absolute limit accepted by the system. If the configuration specifies a
 * higher value, it will be capped to SYSTEM_MAXCONN and a warning will be
 * emitted. The only way to override this limit will be to set it via the
 * command-line '-n' argument.
 */
#ifndef SYSTEM_MAXCONN
#ifndef DEFAULT_MAXCONN
#define DEFAULT_MAXCONN 2000
#endif
#else
#undef  DEFAULT_MAXCONN
#define DEFAULT_MAXCONN SYSTEM_MAXCONN
#endif

/* Minimum check interval for spread health checks. Servers with intervals
 * greater than or equal to this value will have their checks spread apart
 * and will be considered when searching the minimal interval.
 * Others will be ignored for the minimal interval and will have their checks
 * scheduled on a different basis.
 */
#ifndef SRV_CHK_INTER_THRES
#define SRV_CHK_INTER_THRES 1000
#endif

/* Specifies the string used to report the version and release date on the
 * statistics page. May be defined to the empty string ("") to permanently
 * disable the feature.
 */
#ifndef STATS_VERSION_STRING
#define STATS_VERSION_STRING " version " HAPROXY_VERSION ", released " HAPROXY_DATE
#endif

/* Maximum signal queue size, and also number of different signals we can
 * handle.
 */
#ifndef MAX_SIGNAL
#define MAX_SIGNAL 256
#endif

/* Maximum host name length */
#ifndef MAX_HOSTNAME_LEN
#define MAX_HOSTNAME_LEN	32
#endif

/* Maximum health check description length */
#ifndef HCHK_DESC_LEN
#define HCHK_DESC_LEN	128
#endif

#endif /* _COMMON_DEFAULTS_H */