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/*
* Definition of the lbcd wire protocol.
*
* Written by Larry Schwimmer
* Copyright 1996, 1997, 1998, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#ifndef LBCD_PROTOCOL_H
#define LBCD_PROTOCOL_H 1
#include <config.h>
#if HAVE_INTTYPES_H
# include <inttypes.h>
#endif
#if HAVE_STDINT_H
# include <stdint.h>
#endif
#if HAVE_SYS_BITYPES_H
# include <sys/bitypes.h>
#endif
#include <sys/types.h>
#define LBCD_PORTNUM 4330 /* Default port */
#define LBCD_MAXMESG 2048 /* Max UDP message to receive */
#define LBCD_MAX_SERVICES 5 /* Max service requests to allow */
#define LBCD_VERSION 3 /* Protocol version client speaks */
#define LBCD_TIMEOUT 5 /* Default service poll timeout */
/* Protocol operation codes. Currently, there's only one. */
enum lbcd_op {
LBCD_OP_LBINFO = 1 /* Load balance info, request and reply */
};
/* Status codes returned in the header. Some of these aren't used. */
enum lbcd_status {
LBCD_STATUS_REQUEST = 0, /* A request packet */
LBCD_STATUS_OK = 1, /* Load balance info, request and reply */
LBCD_STATUS_ERROR = 2, /* Generic error */
LBCD_STATUS_VERSION = 3, /* Protocol version error */
LBCD_STATUS_PROTOCOL = 4, /* Generic protocol error */
LBCD_STATUS_UNKNOWN_OP = 5, /* Unknown operation requested */
};
/* Service name as sent on the wire (nul-terminated). */
typedef char lbcd_name_type[32];
/* Service weight information as included in the reply. */
struct lbcd_service {
uint32_t host_weight; /* Computed host lb weight */
uint32_t host_incr; /* Computed host lb increment */
};
/*
* Packet header. This is the entirety of the v2 request, and the header of
* the v3 request. It's also the header of the response from the server.
*/
struct lbcd_header {
uint16_t version; /* Protocol version */
uint16_t id; /* Requestor's unique request id */
uint16_t op; /* Operation requested */
uint16_t status; /* Number of services requested */
};
/* Extended request packet. */
struct lbcd_request {
struct lbcd_header h;
lbcd_name_type names[LBCD_MAX_SERVICES];
};
/* Reply packet. */
struct lbcd_reply {
struct lbcd_header h;
uint32_t boot_time; /* Boot time */
uint32_t current_time; /* Host time */
uint32_t user_mtime; /* Time user information last changed */
uint16_t l1; /* 1 minute load (int) (load*100) */
uint16_t l5; /* 5 minute load */
uint16_t l15; /* 15 minute load */
uint16_t tot_users; /* Total number of users logged in */
uint16_t uniq_users; /* Total number of uniq users */
uint8_t on_console; /* True if somone on console */
uint8_t reserved; /* Future use, padding ... */
uint8_t tmp_full; /* Percent of tmp full */
uint8_t tmpdir_full; /* Percent of P_tmpdir full */
uint8_t pad; /* Padding */
uint8_t services; /* Number of service requests */
struct lbcd_service weights[LBCD_MAX_SERVICES + 1];
/* Host service weight/increment pairs */
};
#endif /* !LBCD_PROTOCOL_H */
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