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| Current File : //usr/local/include/postgresql/internal/libpq-int.h |
/*-------------------------------------------------------------------------
*
* libpq-int.h
* This file contains internal definitions meant to be used only by
* the frontend libpq library, not by applications that call it.
*
* An application can include this file if it wants to bypass the
* official API defined by libpq-fe.h, but code that does so is much
* more likely to break across PostgreSQL releases than code that uses
* only the official API.
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/interfaces/libpq/libpq-int.h,v 1.129 2008/01/01 19:46:00 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef LIBPQ_INT_H
#define LIBPQ_INT_H
/* We assume libpq-fe.h has already been included. */
#include "postgres_fe.h"
#include <time.h>
#include <sys/types.h>
#ifndef WIN32
#include <sys/time.h>
#endif
#ifdef ENABLE_THREAD_SAFETY
#ifdef WIN32
#include "pthread-win32.h"
#else
#include <pthread.h>
#endif
#include <signal.h>
#endif
/* include stuff common to fe and be */
#include "getaddrinfo.h"
#include "libpq/pqcomm.h"
/* include stuff found in fe only */
#include "pqexpbuffer.h"
#ifdef ENABLE_GSS
#if defined(HAVE_GSSAPI_H)
#include <gssapi.h>
#else
#include <gssapi/gssapi.h>
#endif
#endif
#ifdef ENABLE_SSPI
#define SECURITY_WIN32
#include <security.h>
#undef SECURITY_WIN32
#ifndef ENABLE_GSS
/*
* Define a fake structure compatible with GSSAPI on Unix.
*/
typedef struct
{
void *value;
int length;
} gss_buffer_desc;
#endif
#endif /* ENABLE_SSPI */
#ifdef USE_SSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
/*
* POSTGRES backend dependent Constants.
*/
#define CMDSTATUS_LEN 64 /* should match COMPLETION_TAG_BUFSIZE */
/*
* PGresult and the subsidiary types PGresAttDesc, PGresAttValue
* represent the result of a query (or more precisely, of a single SQL
* command --- a query string given to PQexec can contain multiple commands).
* Note we assume that a single command can return at most one tuple group,
* hence there is no need for multiple descriptor sets.
*/
/* Subsidiary-storage management structure for PGresult.
* See space management routines in fe-exec.c for details.
* Note that space[k] refers to the k'th byte starting from the physical
* head of the block --- it's a union, not a struct!
*/
typedef union pgresult_data PGresult_data;
union pgresult_data
{
PGresult_data *next; /* link to next block, or NULL */
char space[1]; /* dummy for accessing block as bytes */
};
/* Data about a single attribute (column) of a query result */
typedef struct pgresAttDesc
{
char *name; /* column name */
Oid tableid; /* source table, if known */
int columnid; /* source column, if known */
int format; /* format code for value (text/binary) */
Oid typid; /* type id */
int typlen; /* type size */
int atttypmod; /* type-specific modifier info */
} PGresAttDesc;
/* Data about a single parameter of a prepared statement */
typedef struct pgresParamDesc
{
Oid typid; /* type id */
} PGresParamDesc;
/*
* Data for a single attribute of a single tuple
*
* We use char* for Attribute values.
*
* The value pointer always points to a null-terminated area; we add a
* null (zero) byte after whatever the backend sends us. This is only
* particularly useful for text values ... with a binary value, the
* value might have embedded nulls, so the application can't use C string
* operators on it. But we add a null anyway for consistency.
* Note that the value itself does not contain a length word.
*
* A NULL attribute is a special case in two ways: its len field is NULL_LEN
* and its value field points to null_field in the owning PGresult. All the
* NULL attributes in a query result point to the same place (there's no need
* to store a null string separately for each one).
*/
#define NULL_LEN (-1) /* pg_result len for NULL value */
typedef struct pgresAttValue
{
int len; /* length in bytes of the value */
char *value; /* actual value, plus terminating zero byte */
} PGresAttValue;
/* Typedef for message-field list entries */
typedef struct pgMessageField
{
struct pgMessageField *next; /* list link */
char code; /* field code */
char contents[1]; /* field value (VARIABLE LENGTH) */
} PGMessageField;
/* Fields needed for notice handling */
typedef struct
{
PQnoticeReceiver noticeRec; /* notice message receiver */
void *noticeRecArg;
PQnoticeProcessor noticeProc; /* notice message processor */
void *noticeProcArg;
} PGNoticeHooks;
struct pg_result
{
int ntups;
int numAttributes;
PGresAttDesc *attDescs;
PGresAttValue **tuples; /* each PGresTuple is an array of
* PGresAttValue's */
int tupArrSize; /* allocated size of tuples array */
int numParameters;
PGresParamDesc *paramDescs;
ExecStatusType resultStatus;
char cmdStatus[CMDSTATUS_LEN]; /* cmd status from the query */
int binary; /* binary tuple values if binary == 1,
* otherwise text */
/*
* These fields are copied from the originating PGconn, so that operations
* on the PGresult don't have to reference the PGconn.
*/
PGNoticeHooks noticeHooks;
int client_encoding; /* encoding id */
/*
* Error information (all NULL if not an error result). errMsg is the
* "overall" error message returned by PQresultErrorMessage. If we have
* per-field info then it is stored in a linked list.
*/
char *errMsg; /* error message, or NULL if no error */
PGMessageField *errFields; /* message broken into fields */
/* All NULL attributes in the query result point to this null string */
char null_field[1];
/*
* Space management information. Note that attDescs and error stuff, if
* not null, point into allocated blocks. But tuples points to a
* separately malloc'd block, so that we can realloc it.
*/
PGresult_data *curBlock; /* most recently allocated block */
int curOffset; /* start offset of free space in block */
int spaceLeft; /* number of free bytes remaining in block */
};
/* PGAsyncStatusType defines the state of the query-execution state machine */
typedef enum
{
PGASYNC_IDLE, /* nothing's happening, dude */
PGASYNC_BUSY, /* query in progress */
PGASYNC_READY, /* result ready for PQgetResult */
PGASYNC_COPY_IN, /* Copy In data transfer in progress */
PGASYNC_COPY_OUT /* Copy Out data transfer in progress */
} PGAsyncStatusType;
/* PGQueryClass tracks which query protocol we are now executing */
typedef enum
{
PGQUERY_SIMPLE, /* simple Query protocol (PQexec) */
PGQUERY_EXTENDED, /* full Extended protocol (PQexecParams) */
PGQUERY_PREPARE, /* Parse only (PQprepare) */
PGQUERY_DESCRIBE /* Describe Statement or Portal */
} PGQueryClass;
/* PGSetenvStatusType defines the state of the PQSetenv state machine */
/* (this is used only for 2.0-protocol connections) */
typedef enum
{
SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
SETENV_STATE_QUERY1_SEND, /* About to send a status query */
SETENV_STATE_QUERY1_WAIT, /* Waiting for query to complete */
SETENV_STATE_QUERY2_SEND, /* About to send a status query */
SETENV_STATE_QUERY2_WAIT, /* Waiting for query to complete */
SETENV_STATE_IDLE
} PGSetenvStatusType;
/* Typedef for the EnvironmentOptions[] array */
typedef struct PQEnvironmentOption
{
const char *envName, /* name of an environment variable */
*pgName; /* name of corresponding SET variable */
} PQEnvironmentOption;
/* Typedef for parameter-status list entries */
typedef struct pgParameterStatus
{
struct pgParameterStatus *next; /* list link */
char *name; /* parameter name */
char *value; /* parameter value */
/* Note: name and value are stored in same malloc block as struct is */
} pgParameterStatus;
/* large-object-access data ... allocated only if large-object code is used. */
typedef struct pgLobjfuncs
{
Oid fn_lo_open; /* OID of backend function lo_open */
Oid fn_lo_close; /* OID of backend function lo_close */
Oid fn_lo_creat; /* OID of backend function lo_creat */
Oid fn_lo_create; /* OID of backend function lo_create */
Oid fn_lo_unlink; /* OID of backend function lo_unlink */
Oid fn_lo_lseek; /* OID of backend function lo_lseek */
Oid fn_lo_tell; /* OID of backend function lo_tell */
Oid fn_lo_truncate; /* OID of backend function lo_truncate */
Oid fn_lo_read; /* OID of backend function LOread */
Oid fn_lo_write; /* OID of backend function LOwrite */
} PGlobjfuncs;
/*
* PGconn stores all the state data associated with a single connection
* to a backend.
*/
struct pg_conn
{
/* Saved values of connection options */
char *pghost; /* the machine on which the server is running */
char *pghostaddr; /* the IPv4 address of the machine on which
* the server is running, in IPv4
* numbers-and-dots notation. Takes precedence
* over above. */
char *pgport; /* the server's communication port */
char *pgunixsocket; /* the Unix-domain socket that the server is
* listening on; if NULL, uses a default
* constructed from pgport */
char *pgtty; /* tty on which the backend messages is
* displayed (OBSOLETE, NOT USED) */
char *connect_timeout; /* connection timeout (numeric string) */
char *pgoptions; /* options to start the backend with */
char *dbName; /* database name */
char *pguser; /* Postgres username and password, if any */
char *pgpass;
bool pgpass_from_client; /* did password come from connect args? */
char *sslmode; /* SSL mode (require,prefer,allow,disable) */
#if defined(KRB5) || defined(ENABLE_GSS) || defined(ENABLE_SSPI)
char *krbsrvname; /* Kerberos service name */
#endif
/* Optional file to write trace info to */
FILE *Pfdebug;
/* Callback procedures for notice message processing */
PGNoticeHooks noticeHooks;
/* Status indicators */
ConnStatusType status;
PGAsyncStatusType asyncStatus;
PGTransactionStatusType xactStatus; /* never changes to ACTIVE */
PGQueryClass queryclass;
char *last_query; /* last SQL command, or NULL if unknown */
bool options_valid; /* true if OK to attempt connection */
bool nonblocking; /* whether this connection is using nonblock
* sending semantics */
char copy_is_binary; /* 1 = copy binary, 0 = copy text */
int copy_already_done; /* # bytes already returned in COPY
* OUT */
PGnotify *notifyHead; /* oldest unreported Notify msg */
PGnotify *notifyTail; /* newest unreported Notify msg */
/* Connection data */
int sock; /* Unix FD for socket, -1 if not connected */
SockAddr laddr; /* Local address */
SockAddr raddr; /* Remote address */
ProtocolVersion pversion; /* FE/BE protocol version in use */
int sversion; /* server version, e.g. 70401 for 7.4.1 */
bool password_needed; /* true if server demanded a password */
/* Transient state needed while establishing connection */
struct addrinfo *addrlist; /* list of possible backend addresses */
struct addrinfo *addr_cur; /* the one currently being tried */
int addrlist_family; /* needed to know how to free addrlist */
PGSetenvStatusType setenv_state; /* for 2.0 protocol only */
const PQEnvironmentOption *next_eo;
/* Miscellaneous stuff */
int be_pid; /* PID of backend --- needed for cancels */
int be_key; /* key of backend --- needed for cancels */
char md5Salt[4]; /* password salt received from backend */
char cryptSalt[2]; /* password salt received from backend */
pgParameterStatus *pstatus; /* ParameterStatus data */
int client_encoding; /* encoding id */
bool std_strings; /* standard_conforming_strings */
PGVerbosity verbosity; /* error/notice message verbosity */
PGlobjfuncs *lobjfuncs; /* private state for large-object access fns */
/* Buffer for data received from backend and not yet processed */
char *inBuffer; /* currently allocated buffer */
int inBufSize; /* allocated size of buffer */
int inStart; /* offset to first unconsumed data in buffer */
int inCursor; /* next byte to tentatively consume */
int inEnd; /* offset to first position after avail data */
/* Buffer for data not yet sent to backend */
char *outBuffer; /* currently allocated buffer */
int outBufSize; /* allocated size of buffer */
int outCount; /* number of chars waiting in buffer */
/* State for constructing messages in outBuffer */
int outMsgStart; /* offset to msg start (length word); if -1,
* msg has no length word */
int outMsgEnd; /* offset to msg end (so far) */
/* Status for asynchronous result construction */
PGresult *result; /* result being constructed */
PGresAttValue *curTuple; /* tuple currently being read */
#ifdef USE_SSL
bool allow_ssl_try; /* Allowed to try SSL negotiation */
bool wait_ssl_try; /* Delay SSL negotiation until after
* attempting normal connection */
SSL *ssl; /* SSL status, if have SSL connection */
X509 *peer; /* X509 cert of server */
char peer_dn[256 + 1]; /* peer distinguished name */
char peer_cn[SM_USER + 1]; /* peer common name */
#endif
#ifdef ENABLE_GSS
gss_ctx_id_t gctx; /* GSS context */
gss_name_t gtarg_nam; /* GSS target name */
gss_buffer_desc ginbuf; /* GSS input token */
gss_buffer_desc goutbuf; /* GSS output token */
#endif
#ifdef ENABLE_SSPI
#ifndef ENABLE_GSS
gss_buffer_desc ginbuf; /* GSS input token */
#else
char *gsslib; /* What GSS librart to use ("gssapi" or
* "sspi") */
#endif
CredHandle *sspicred; /* SSPI credentials handle */
CtxtHandle *sspictx; /* SSPI context */
char *sspitarget; /* SSPI target name */
int usesspi; /* Indicate if SSPI is in use on the
* connection */
#endif
/* Buffer for current error message */
PQExpBufferData errorMessage; /* expansible string */
/* Buffer for receiving various parts of messages */
PQExpBufferData workBuffer; /* expansible string */
};
/* PGcancel stores all data necessary to cancel a connection. A copy of this
* data is required to safely cancel a connection running on a different
* thread.
*/
struct pg_cancel
{
SockAddr raddr; /* Remote address */
int be_pid; /* PID of backend --- needed for cancels */
int be_key; /* key of backend --- needed for cancels */
};
/* String descriptions of the ExecStatusTypes.
* direct use of this array is deprecated; call PQresStatus() instead.
*/
extern char *const pgresStatus[];
/* ----------------
* Internal functions of libpq
* Functions declared here need to be visible across files of libpq,
* but are not intended to be called by applications. We use the
* convention "pqXXX" for internal functions, vs. the "PQxxx" names
* used for application-visible routines.
* ----------------
*/
/* === in fe-connect.c === */
extern int pqPacketSend(PGconn *conn, char pack_type,
const void *buf, size_t buf_len);
extern bool pqGetHomeDirectory(char *buf, int bufsize);
#ifdef ENABLE_THREAD_SAFETY
extern pgthreadlock_t pg_g_threadlock;
#define pglock_thread() pg_g_threadlock(true)
#define pgunlock_thread() pg_g_threadlock(false)
#else
#define pglock_thread() ((void) 0)
#define pgunlock_thread() ((void) 0)
#endif
/* === in fe-exec.c === */
extern void pqSetResultError(PGresult *res, const char *msg);
extern void pqCatenateResultError(PGresult *res, const char *msg);
extern void *pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary);
extern char *pqResultStrdup(PGresult *res, const char *str);
extern void pqClearAsyncResult(PGconn *conn);
extern void pqSaveErrorResult(PGconn *conn);
extern PGresult *pqPrepareAsyncResult(PGconn *conn);
extern void
pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
/* This lets gcc check the format string for consistency. */
__attribute__((format(printf, 2, 3)));
extern int pqAddTuple(PGresult *res, PGresAttValue *tup);
extern void pqSaveMessageField(PGresult *res, char code,
const char *value);
extern void pqSaveParameterStatus(PGconn *conn, const char *name,
const char *value);
extern void pqHandleSendFailure(PGconn *conn);
/* === in fe-protocol2.c === */
extern PostgresPollingStatusType pqSetenvPoll(PGconn *conn);
extern char *pqBuildStartupPacket2(PGconn *conn, int *packetlen,
const PQEnvironmentOption *options);
extern void pqParseInput2(PGconn *conn);
extern int pqGetCopyData2(PGconn *conn, char **buffer, int async);
extern int pqGetline2(PGconn *conn, char *s, int maxlen);
extern int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize);
extern int pqEndcopy2(PGconn *conn);
extern PGresult *pqFunctionCall2(PGconn *conn, Oid fnid,
int *result_buf, int *actual_result_len,
int result_is_int,
const PQArgBlock *args, int nargs);
/* === in fe-protocol3.c === */
extern char *pqBuildStartupPacket3(PGconn *conn, int *packetlen,
const PQEnvironmentOption *options);
extern void pqParseInput3(PGconn *conn);
extern int pqGetErrorNotice3(PGconn *conn, bool isError);
extern int pqGetCopyData3(PGconn *conn, char **buffer, int async);
extern int pqGetline3(PGconn *conn, char *s, int maxlen);
extern int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize);
extern int pqEndcopy3(PGconn *conn);
extern PGresult *pqFunctionCall3(PGconn *conn, Oid fnid,
int *result_buf, int *actual_result_len,
int result_is_int,
const PQArgBlock *args, int nargs);
/* === in fe-misc.c === */
/*
* "Get" and "Put" routines return 0 if successful, EOF if not. Note that for
* Get, EOF merely means the buffer is exhausted, not that there is
* necessarily any error.
*/
extern int pqCheckOutBufferSpace(int bytes_needed, PGconn *conn);
extern int pqCheckInBufferSpace(int bytes_needed, PGconn *conn);
extern int pqGetc(char *result, PGconn *conn);
extern int pqPutc(char c, PGconn *conn);
extern int pqGets(PQExpBuffer buf, PGconn *conn);
extern int pqPuts(const char *s, PGconn *conn);
extern int pqGetnchar(char *s, size_t len, PGconn *conn);
extern int pqPutnchar(const char *s, size_t len, PGconn *conn);
extern int pqGetInt(int *result, size_t bytes, PGconn *conn);
extern int pqPutInt(int value, size_t bytes, PGconn *conn);
extern int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn);
extern int pqPutMsgEnd(PGconn *conn);
extern int pqReadData(PGconn *conn);
extern int pqFlush(PGconn *conn);
extern int pqWait(int forRead, int forWrite, PGconn *conn);
extern int pqWaitTimed(int forRead, int forWrite, PGconn *conn,
time_t finish_time);
extern int pqReadReady(PGconn *conn);
extern int pqWriteReady(PGconn *conn);
/* === in fe-secure.c === */
extern int pqsecure_initialize(PGconn *);
extern void pqsecure_destroy(void);
extern PostgresPollingStatusType pqsecure_open_client(PGconn *);
extern void pqsecure_close(PGconn *);
extern ssize_t pqsecure_read(PGconn *, void *ptr, size_t len);
extern ssize_t pqsecure_write(PGconn *, const void *ptr, size_t len);
#if defined(ENABLE_THREAD_SAFETY) && !defined(WIN32)
extern int pq_block_sigpipe(sigset_t *osigset, bool *sigpipe_pending);
extern void pq_reset_sigpipe(sigset_t *osigset, bool sigpipe_pending,
bool got_epipe);
#endif
/*
* this is so that we can check if a connection is non-blocking internally
* without the overhead of a function call
*/
#define pqIsnonblocking(conn) ((conn)->nonblocking)
#ifdef ENABLE_NLS
extern char *
libpq_gettext(const char *msgid)
__attribute__((format_arg(1)));
#else
#define libpq_gettext(x) (x)
#endif
/*
* These macros are needed to let error-handling code be portable between
* Unix and Windows. (ugh)
*/
#ifdef WIN32
#define SOCK_ERRNO (WSAGetLastError())
#define SOCK_STRERROR winsock_strerror
#define SOCK_ERRNO_SET(e) WSASetLastError(e)
#else
#define SOCK_ERRNO errno
#define SOCK_STRERROR pqStrerror
#define SOCK_ERRNO_SET(e) (errno = (e))
#endif
#endif /* LIBPQ_INT_H */