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server.h

/*
  include/types/server.h
  This file defines everything related to servers.

  Copyright (C) 2000-2006 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 _TYPES_SERVER_H
#define _TYPES_SERVER_H

#include <netinet/in.h>
#include <arpa/inet.h>

#include <common/config.h>
#include <common/mini-clist.h>

#include <types/buffers.h>
#include <types/proxy.h>
#include <types/queue.h>
#include <types/task.h>


/* server flags */
#define SRV_RUNNING     0x0001      /* the server is UP */
#define SRV_BACKUP      0x0002      /* this server is a backup server */
#define SRV_MAPPORTS    0x0004      /* this server uses mapped ports */
#define SRV_BIND_SRC    0x0008      /* this server uses a specific source address */
#define SRV_CHECKED     0x0010      /* this server needs to be checked */

#define SRV_TPROXY_ADDR 0x0020      /* bind to this non-local address to reach this server */
#define SRV_TPROXY_CIP  0x0040      /* bind to the client's IP address to reach this server */
#define SRV_TPROXY_CLI  0x0060      /* bind to the client's IP+port to reach this server */
#define SRV_TPROXY_MASK 0x0060      /* bind to a non-local address to reach this server */

/* function which act on servers need to return various errors */
#define SRV_STATUS_OK       0   /* everything is OK. */
#define SRV_STATUS_INTERNAL 1   /* other unrecoverable errors. */
#define SRV_STATUS_NOSRV    2   /* no server is available */
#define SRV_STATUS_FULL     3   /* the/all server(s) are saturated */
#define SRV_STATUS_QUEUED   4   /* the/all server(s) are saturated but the connection was queued */


struct server {
      struct server *next;
      int state;                    /* server state (SRV_*) */
      int  cklen;                   /* the len of the cookie, to speed up checks */
      char *cookie;                       /* the id set in the cookie */

      struct proxy *proxy;                /* the proxy this server belongs to */
      int cur_sess, cur_sess_max;         /* number of currently active sessions (including syn_sent) */
      unsigned maxconn, minconn;          /* max # of active sessions (0 = unlimited), min# for dynamic limit. */
      int nbpend, nbpend_max;             /* number of pending connections */
      struct list pendconns;              /* pending connections */
      struct task *queue_mgt;             /* the task associated to the queue processing */

      struct sockaddr_in addr;            /* the address to connect to */
      struct sockaddr_in source_addr;           /* the address to which we want to bind for connect() */
#ifdef CONFIG_HAP_CTTPROXY
      struct sockaddr_in tproxy_addr;           /* non-local address we want to bind to for connect() */
#endif

      struct sockaddr_in check_addr;            /* the address to check, if different from <addr> */
      short check_port;             /* the port to use for the health checks */
      int health;                   /* 0->rise-1 = bad; rise->rise+fall-1 = good */
      int rise, fall;                     /* time in iterations */
      int inter;                    /* time in milliseconds */
      int result;                   /* 0 = connect OK, -1 = connect KO */
      int curfd;                    /* file desc used for current test, or -1 if not in test */

      char *id;                     /* just for identification */
      unsigned uweight, eweight;          /* user-specified weight, and effective weight */
      unsigned wscore;              /* weight score, used during srv map computation */

      unsigned failed_checks, down_trans; /* failed checks and up-down transitions */
      unsigned failed_conns, failed_resp; /* failed connect() and responses */
      unsigned failed_secu;               /* blocked responses because of security concerns */
      unsigned cum_sess;                  /* cumulated number of sessions really sent to this server */
      long long bytes_in;                 /* number of bytes transferred from the client to the server */
      long long bytes_out;                /* number of bytes transferred from the server to the client */
};


#endif /* _TYPES_SERVER_H */

/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */

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