612 lines
21 KiB
C
612 lines
21 KiB
C
/*-------------------------------------------------------------------------
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*
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* libpq-int.h
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* This file contains internal definitions meant to be used only by
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* the frontend libpq library, not by applications that call it.
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*
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* An application can include this file if it wants to bypass the
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* official API defined by libpq-fe.h, but code that does so is much
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* more likely to break across PostgreSQL releases than code that uses
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* only the official API.
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*
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* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/interfaces/libpq/libpq-int.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LIBPQ_INT_H
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#define LIBPQ_INT_H
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/* We assume libpq-fe.h has already been included. */
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#include "postgres_fe.h"
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#include "libpq-events.h"
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#include <time.h>
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#include <sys/types.h>
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#ifndef WIN32
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#include <sys/time.h>
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#endif
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#ifdef ENABLE_THREAD_SAFETY
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#ifdef WIN32
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#include "pthread-win32.h"
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#else
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#include <pthread.h>
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#endif
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#include <signal.h>
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#endif
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/* include stuff common to fe and be */
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#include "getaddrinfo.h"
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#include "libpq/pqcomm.h"
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/* include stuff found in fe only */
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#include "pqexpbuffer.h"
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#ifdef ENABLE_GSS
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#if defined(HAVE_GSSAPI_H)
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#include <gssapi.h>
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#else
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#include <gssapi/gssapi.h>
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#endif
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#endif
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#ifdef ENABLE_SSPI
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#define SECURITY_WIN32
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#if defined(WIN32) && !defined(WIN32_ONLY_COMPILER)
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#include <ntsecapi.h>
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#endif
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#include <security.h>
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#undef SECURITY_WIN32
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#ifndef ENABLE_GSS
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/*
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* Define a fake structure compatible with GSSAPI on Unix.
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*/
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typedef struct
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{
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void *value;
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int length;
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} gss_buffer_desc;
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#endif
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#endif /* ENABLE_SSPI */
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#ifdef USE_SSL
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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#if (SSLEAY_VERSION_NUMBER >= 0x00907000L) && !defined(OPENSSL_NO_ENGINE)
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#define USE_SSL_ENGINE
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#endif
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#endif /* USE_SSL */
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/*
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* POSTGRES backend dependent Constants.
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*/
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#define CMDSTATUS_LEN 64 /* should match COMPLETION_TAG_BUFSIZE */
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/*
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* PGresult and the subsidiary types PGresAttDesc, PGresAttValue
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* represent the result of a query (or more precisely, of a single SQL
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* command --- a query string given to PQexec can contain multiple commands).
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* Note we assume that a single command can return at most one tuple group,
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* hence there is no need for multiple descriptor sets.
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*/
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/* Subsidiary-storage management structure for PGresult.
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* See space management routines in fe-exec.c for details.
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* Note that space[k] refers to the k'th byte starting from the physical
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* head of the block --- it's a union, not a struct!
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*/
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typedef union pgresult_data PGresult_data;
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union pgresult_data
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{
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PGresult_data *next; /* link to next block, or NULL */
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char space[1]; /* dummy for accessing block as bytes */
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};
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/* Data about a single parameter of a prepared statement */
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typedef struct pgresParamDesc
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{
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Oid typid; /* type id */
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} PGresParamDesc;
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/*
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* Data for a single attribute of a single tuple
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*
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* We use char* for Attribute values.
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*
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* The value pointer always points to a null-terminated area; we add a
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* null (zero) byte after whatever the backend sends us. This is only
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* particularly useful for text values ... with a binary value, the
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* value might have embedded nulls, so the application can't use C string
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* operators on it. But we add a null anyway for consistency.
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* Note that the value itself does not contain a length word.
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*
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* A NULL attribute is a special case in two ways: its len field is NULL_LEN
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* and its value field points to null_field in the owning PGresult. All the
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* NULL attributes in a query result point to the same place (there's no need
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* to store a null string separately for each one).
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*/
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#define NULL_LEN (-1) /* pg_result len for NULL value */
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typedef struct pgresAttValue
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{
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int len; /* length in bytes of the value */
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char *value; /* actual value, plus terminating zero byte */
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} PGresAttValue;
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/* Typedef for message-field list entries */
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typedef struct pgMessageField
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{
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struct pgMessageField *next; /* list link */
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char code; /* field code */
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char contents[1]; /* field value (VARIABLE LENGTH) */
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} PGMessageField;
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/* Fields needed for notice handling */
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typedef struct
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{
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PQnoticeReceiver noticeRec; /* notice message receiver */
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void *noticeRecArg;
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PQnoticeProcessor noticeProc; /* notice message processor */
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void *noticeProcArg;
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} PGNoticeHooks;
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typedef struct PGEvent
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{
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PGEventProc proc; /* the function to call on events */
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char *name; /* used only for error messages */
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void *passThrough; /* pointer supplied at registration time */
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void *data; /* optional state (instance) data */
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bool resultInitialized; /* T if RESULTCREATE/COPY succeeded */
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} PGEvent;
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struct pg_result
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{
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int ntups;
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int numAttributes;
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PGresAttDesc *attDescs;
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PGresAttValue **tuples; /* each PGresTuple is an array of
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* PGresAttValue's */
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int tupArrSize; /* allocated size of tuples array */
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int numParameters;
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PGresParamDesc *paramDescs;
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ExecStatusType resultStatus;
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char cmdStatus[CMDSTATUS_LEN]; /* cmd status from the query */
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int binary; /* binary tuple values if binary == 1,
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* otherwise text */
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/*
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* These fields are copied from the originating PGconn, so that operations
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* on the PGresult don't have to reference the PGconn.
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*/
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PGNoticeHooks noticeHooks;
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PGEvent *events;
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int nEvents;
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int client_encoding; /* encoding id */
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/*
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* Error information (all NULL if not an error result). errMsg is the
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* "overall" error message returned by PQresultErrorMessage. If we have
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* per-field info then it is stored in a linked list.
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*/
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char *errMsg; /* error message, or NULL if no error */
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PGMessageField *errFields; /* message broken into fields */
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/* All NULL attributes in the query result point to this null string */
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char null_field[1];
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/*
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* Space management information. Note that attDescs and error stuff, if
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* not null, point into allocated blocks. But tuples points to a
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* separately malloc'd block, so that we can realloc it.
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*/
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PGresult_data *curBlock; /* most recently allocated block */
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int curOffset; /* start offset of free space in block */
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int spaceLeft; /* number of free bytes remaining in block */
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};
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/* PGAsyncStatusType defines the state of the query-execution state machine */
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typedef enum
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{
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PGASYNC_IDLE, /* nothing's happening, dude */
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PGASYNC_BUSY, /* query in progress */
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PGASYNC_READY, /* result ready for PQgetResult */
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PGASYNC_COPY_IN, /* Copy In data transfer in progress */
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PGASYNC_COPY_OUT /* Copy Out data transfer in progress */
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} PGAsyncStatusType;
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/* PGQueryClass tracks which query protocol we are now executing */
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typedef enum
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{
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PGQUERY_SIMPLE, /* simple Query protocol (PQexec) */
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PGQUERY_EXTENDED, /* full Extended protocol (PQexecParams) */
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PGQUERY_PREPARE, /* Parse only (PQprepare) */
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PGQUERY_DESCRIBE /* Describe Statement or Portal */
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} PGQueryClass;
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/* PGSetenvStatusType defines the state of the PQSetenv state machine */
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/* (this is used only for 2.0-protocol connections) */
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typedef enum
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{
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SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */
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SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */
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SETENV_STATE_QUERY1_SEND, /* About to send a status query */
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SETENV_STATE_QUERY1_WAIT, /* Waiting for query to complete */
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SETENV_STATE_QUERY2_SEND, /* About to send a status query */
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SETENV_STATE_QUERY2_WAIT, /* Waiting for query to complete */
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SETENV_STATE_IDLE
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} PGSetenvStatusType;
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/* Typedef for the EnvironmentOptions[] array */
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typedef struct PQEnvironmentOption
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{
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const char *envName, /* name of an environment variable */
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*pgName; /* name of corresponding SET variable */
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} PQEnvironmentOption;
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/* Typedef for parameter-status list entries */
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typedef struct pgParameterStatus
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{
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struct pgParameterStatus *next; /* list link */
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char *name; /* parameter name */
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char *value; /* parameter value */
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/* Note: name and value are stored in same malloc block as struct is */
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} pgParameterStatus;
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/* large-object-access data ... allocated only if large-object code is used. */
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typedef struct pgLobjfuncs
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{
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Oid fn_lo_open; /* OID of backend function lo_open */
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Oid fn_lo_close; /* OID of backend function lo_close */
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Oid fn_lo_creat; /* OID of backend function lo_creat */
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Oid fn_lo_create; /* OID of backend function lo_create */
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Oid fn_lo_unlink; /* OID of backend function lo_unlink */
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Oid fn_lo_lseek; /* OID of backend function lo_lseek */
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Oid fn_lo_tell; /* OID of backend function lo_tell */
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Oid fn_lo_truncate; /* OID of backend function lo_truncate */
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Oid fn_lo_read; /* OID of backend function LOread */
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Oid fn_lo_write; /* OID of backend function LOwrite */
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} PGlobjfuncs;
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/*
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* PGconn stores all the state data associated with a single connection
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* to a backend.
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*/
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struct pg_conn
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{
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/* Saved values of connection options */
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char *pghost; /* the machine on which the server is running */
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char *pghostaddr; /* the numeric IP address of the machine on
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* which the server is running. Takes
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* precedence over above. */
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char *pgport; /* the server's communication port */
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char *pgunixsocket; /* the Unix-domain socket that the server is
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* listening on; if NULL, uses a default
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* constructed from pgport */
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char *pgtty; /* tty on which the backend messages is
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* displayed (OBSOLETE, NOT USED) */
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char *connect_timeout; /* connection timeout (numeric string) */
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char *pgoptions; /* options to start the backend with */
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char *appname; /* application name */
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char *fbappname; /* fallback application name */
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char *dbName; /* database name */
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char *replication; /* connect as the replication standby? */
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char *pguser; /* Postgres username and password, if any */
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char *pgpass;
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char *keepalives; /* use TCP keepalives? */
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char *keepalives_idle; /* time between TCP keepalives */
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char *keepalives_interval; /* time between TCP keepalive
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* retransmits */
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char *keepalives_count; /* maximum number of TCP keepalive
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* retransmits */
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char *sslmode; /* SSL mode (require,prefer,allow,disable) */
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char *sslkey; /* client key filename */
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char *sslcert; /* client certificate filename */
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char *sslrootcert; /* root certificate filename */
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char *sslcrl; /* certificate revocation list filename */
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char *requirepeer; /* required peer credentials for local sockets */
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#if defined(KRB5) || defined(ENABLE_GSS) || defined(ENABLE_SSPI)
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char *krbsrvname; /* Kerberos service name */
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#endif
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/* Optional file to write trace info to */
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FILE *Pfdebug;
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/* Callback procedures for notice message processing */
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PGNoticeHooks noticeHooks;
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/* Event procs registered via PQregisterEventProc */
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PGEvent *events; /* expandable array of event data */
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int nEvents; /* number of active events */
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int eventArraySize; /* allocated array size */
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/* Status indicators */
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ConnStatusType status;
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PGAsyncStatusType asyncStatus;
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PGTransactionStatusType xactStatus; /* never changes to ACTIVE */
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PGQueryClass queryclass;
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char *last_query; /* last SQL command, or NULL if unknown */
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bool options_valid; /* true if OK to attempt connection */
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bool nonblocking; /* whether this connection is using nonblock
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* sending semantics */
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char copy_is_binary; /* 1 = copy binary, 0 = copy text */
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int copy_already_done; /* # bytes already returned in COPY
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* OUT */
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PGnotify *notifyHead; /* oldest unreported Notify msg */
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PGnotify *notifyTail; /* newest unreported Notify msg */
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/* Connection data */
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int sock; /* Unix FD for socket, -1 if not connected */
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SockAddr laddr; /* Local address */
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SockAddr raddr; /* Remote address */
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ProtocolVersion pversion; /* FE/BE protocol version in use */
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int sversion; /* server version, e.g. 70401 for 7.4.1 */
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bool password_needed; /* true if server demanded a password */
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bool dot_pgpass_used; /* true if used .pgpass */
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bool sigpipe_so; /* have we masked SIGPIPE via SO_NOSIGPIPE? */
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bool sigpipe_flag; /* can we mask SIGPIPE via MSG_NOSIGNAL? */
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/* Transient state needed while establishing connection */
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struct addrinfo *addrlist; /* list of possible backend addresses */
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struct addrinfo *addr_cur; /* the one currently being tried */
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int addrlist_family; /* needed to know how to free addrlist */
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PGSetenvStatusType setenv_state; /* for 2.0 protocol only */
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const PQEnvironmentOption *next_eo;
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bool send_appname; /* okay to send application_name? */
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/* Miscellaneous stuff */
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int be_pid; /* PID of backend --- needed for cancels */
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int be_key; /* key of backend --- needed for cancels */
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char md5Salt[4]; /* password salt received from backend */
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pgParameterStatus *pstatus; /* ParameterStatus data */
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int client_encoding; /* encoding id */
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bool std_strings; /* standard_conforming_strings */
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PGVerbosity verbosity; /* error/notice message verbosity */
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PGlobjfuncs *lobjfuncs; /* private state for large-object access fns */
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/* Buffer for data received from backend and not yet processed */
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char *inBuffer; /* currently allocated buffer */
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int inBufSize; /* allocated size of buffer */
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int inStart; /* offset to first unconsumed data in buffer */
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int inCursor; /* next byte to tentatively consume */
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int inEnd; /* offset to first position after avail data */
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/* Buffer for data not yet sent to backend */
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char *outBuffer; /* currently allocated buffer */
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int outBufSize; /* allocated size of buffer */
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int outCount; /* number of chars waiting in buffer */
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/* State for constructing messages in outBuffer */
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int outMsgStart; /* offset to msg start (length word); if -1,
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* msg has no length word */
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int outMsgEnd; /* offset to msg end (so far) */
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/* Status for asynchronous result construction */
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PGresult *result; /* result being constructed */
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PGresAttValue *curTuple; /* tuple currently being read */
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#ifdef USE_SSL
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bool allow_ssl_try; /* Allowed to try SSL negotiation */
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bool wait_ssl_try; /* Delay SSL negotiation until after
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* attempting normal connection */
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SSL *ssl; /* SSL status, if have SSL connection */
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X509 *peer; /* X509 cert of server */
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char peer_dn[256 + 1]; /* peer distinguished name */
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char peer_cn[SM_USER + 1]; /* peer common name */
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#ifdef USE_SSL_ENGINE
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ENGINE *engine; /* SSL engine, if any */
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#else
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void *engine; /* dummy field to keep struct the same if
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* OpenSSL version changes */
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#endif
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#endif /* USE_SSL */
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#ifdef ENABLE_GSS
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gss_ctx_id_t gctx; /* GSS context */
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gss_name_t gtarg_nam; /* GSS target name */
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gss_buffer_desc ginbuf; /* GSS input token */
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gss_buffer_desc goutbuf; /* GSS output token */
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#endif
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#ifdef ENABLE_SSPI
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#ifndef ENABLE_GSS
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gss_buffer_desc ginbuf; /* GSS input token */
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#else
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char *gsslib; /* What GSS librart to use ("gssapi" or
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* "sspi") */
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#endif
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CredHandle *sspicred; /* SSPI credentials handle */
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CtxtHandle *sspictx; /* SSPI context */
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char *sspitarget; /* SSPI target name */
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int usesspi; /* Indicate if SSPI is in use on the
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* connection */
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#endif
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/* Buffer for current error message */
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PQExpBufferData errorMessage; /* expansible string */
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/* Buffer for receiving various parts of messages */
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PQExpBufferData workBuffer; /* expansible string */
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};
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/* PGcancel stores all data necessary to cancel a connection. A copy of this
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* data is required to safely cancel a connection running on a different
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* thread.
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*/
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struct pg_cancel
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{
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SockAddr raddr; /* Remote address */
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int be_pid; /* PID of backend --- needed for cancels */
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int be_key; /* key of backend --- needed for cancels */
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};
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/* String descriptions of the ExecStatusTypes.
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* direct use of this array is deprecated; call PQresStatus() instead.
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*/
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extern char *const pgresStatus[];
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/* ----------------
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* Internal functions of libpq
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* Functions declared here need to be visible across files of libpq,
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* but are not intended to be called by applications. We use the
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* convention "pqXXX" for internal functions, vs. the "PQxxx" names
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* used for application-visible routines.
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* ----------------
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*/
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/* === in fe-connect.c === */
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extern int pqPacketSend(PGconn *conn, char pack_type,
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const void *buf, size_t buf_len);
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extern bool pqGetHomeDirectory(char *buf, int bufsize);
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#ifdef ENABLE_THREAD_SAFETY
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extern pgthreadlock_t pg_g_threadlock;
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#define PGTHREAD_ERROR(msg) \
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do { \
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fprintf(stderr, "%s\n", msg); \
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exit(1); \
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} while (0)
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#define pglock_thread() pg_g_threadlock(true)
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#define pgunlock_thread() pg_g_threadlock(false)
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#else
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#define pglock_thread() ((void) 0)
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#define pgunlock_thread() ((void) 0)
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#endif
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/* === in fe-exec.c === */
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extern void pqSetResultError(PGresult *res, const char *msg);
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extern void pqCatenateResultError(PGresult *res, const char *msg);
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extern void *pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary);
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extern char *pqResultStrdup(PGresult *res, const char *str);
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extern void pqClearAsyncResult(PGconn *conn);
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extern void pqSaveErrorResult(PGconn *conn);
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extern PGresult *pqPrepareAsyncResult(PGconn *conn);
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extern void
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pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...)
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/* This lets gcc check the format string for consistency. */
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__attribute__((format(printf, 2, 3)));
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extern int pqAddTuple(PGresult *res, PGresAttValue *tup);
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extern void pqSaveMessageField(PGresult *res, char code,
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|
const char *value);
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extern void pqSaveParameterStatus(PGconn *conn, const char *name,
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const char *value);
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extern void pqHandleSendFailure(PGconn *conn);
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|
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/* === in fe-protocol2.c === */
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|
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extern PostgresPollingStatusType pqSetenvPoll(PGconn *conn);
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|
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extern char *pqBuildStartupPacket2(PGconn *conn, int *packetlen,
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const PQEnvironmentOption *options);
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extern void pqParseInput2(PGconn *conn);
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extern int pqGetCopyData2(PGconn *conn, char **buffer, int async);
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extern int pqGetline2(PGconn *conn, char *s, int maxlen);
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extern int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize);
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extern int pqEndcopy2(PGconn *conn);
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extern PGresult *pqFunctionCall2(PGconn *conn, Oid fnid,
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int *result_buf, int *actual_result_len,
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int result_is_int,
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const PQArgBlock *args, int nargs);
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|
|
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/* === in fe-protocol3.c === */
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|
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extern char *pqBuildStartupPacket3(PGconn *conn, int *packetlen,
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|
const PQEnvironmentOption *options);
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|
extern void pqParseInput3(PGconn *conn);
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extern int pqGetErrorNotice3(PGconn *conn, bool isError);
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extern int pqGetCopyData3(PGconn *conn, char **buffer, int async);
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|
extern int pqGetline3(PGconn *conn, char *s, int maxlen);
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|
extern int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize);
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|
extern int pqEndcopy3(PGconn *conn);
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|
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(size_t bytes_needed, PGconn *conn);
|
|
extern int pqCheckInBufferSpace(size_t 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 pqGets_append(PQExpBuffer buf, PGconn *conn);
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|
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 */
|