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/*-------------------------------------------------------------------------
*
* libpq-be.h--
* This file contains definitions for structures and
* externs for functions used by the POSTGRES backend.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: libpq-be.h,v 1.13 1999/01/11 03:56:11 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LIBPQ_BE_H
#define LIBPQ_BE_H
#include <stdio.h>
#include <sys/types.h>
#include "libpq/pqcomm.h"
#include "libpq/hba.h"
/* Protocol v0 password packet. */
typedef struct PasswordPacketV0
{
uint32 unused;
char data[288]; /* User and password as strings. */
} PasswordPacketV0;
/*
* Password packet. The length of the password can be changed without
* affecting anything.
*/
typedef struct PasswordPacket
{
char passwd[100]; /* The password. */
} PasswordPacket;
/* Error message packet. */
typedef struct ErrorMessagePacket
{
char data[1 + 100]; /* 'E' + the message. */
} ErrorMessagePacket;
/* Authentication request packet. */
typedef struct AuthRequestPacket
{
char data[1 + sizeof(AuthRequest) + 2]; /* 'R' + the request +
* optional salt. */
} AuthRequestPacket;
/* These are used by the packet handling routines. */
typedef enum
{
Idle,
ReadingPacketLength,
ReadingPacket,
WritingPacket
} PacketState;
typedef int (*PacketDoneProc) (void *arg, PacketLen pktlen, void *pktdata);
typedef struct Packet
{
PacketState state; /* What's in progress. */
PacketLen len; /* Actual length */
int nrtodo; /* Bytes still to transfer */
char *ptr; /* Buffer pointer */
PacketDoneProc iodone; /* I/O complete callback */
void *arg; /* Argument to callback */
/*
* We declare the data buffer as a union of the allowed packet types,
* mainly to ensure that enough space is allocated for the largest
* one.
*/
union
{
/* These are outgoing so have no packet length prepended. */
ErrorMessagePacket em;
AuthRequestPacket ar;
/* These are incoming and have a packet length prepended. */
StartupPacket si;
CancelRequestPacket canc;
PasswordPacketV0 pwv0;
PasswordPacket pw;
} pkt;
} Packet;
/*
* This is used by the postmaster in its communication with frontends. It is
* contains all state information needed during this communication before the
* backend is run.
*/
typedef struct Port
{
int sock; /* File descriptor */
Packet pktInfo; /* For the packet handlers */
SockAddr laddr; /* local addr (us) */
SockAddr raddr; /* remote addr (them) */
char salt[2]; /* Password salt */
/*
* Information that needs to be held during the fe/be authentication
* handshake.
*/
ProtocolVersion proto;
char database[SM_DATABASE + 1];
char user[SM_USER + 1];
char options[SM_OPTIONS + 1];
char tty[SM_TTY + 1];
char auth_arg[MAX_AUTH_ARG];
UserAuth auth_method;
} Port;
extern ProtocolVersion FrontendProtocol;
/*
* prototypes for functions in pqpacket.c
*/
void PacketReceiveSetup(Packet *pkt, PacketDoneProc iodone, void *arg);
int PacketReceiveFragment(Packet *pkt, int sock);
void PacketSendSetup(Packet *pkt, int nbytes, PacketDoneProc iodone, void *arg);
int PacketSendFragment(Packet *pkt, int sock);
void PacketSendError(Packet *pkt, char *errormsg);
#endif /* LIBPQ_BE_H */
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