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file.c
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/*
* Attention - this functionality doesn't work when Orace is not linked with
* correct runtime library. The combination "vcruntime140.dll" is working for
* PostgreSQL 12 (vcruntime140d.dll doesn't work). Probably this runtime should
* be same like Postgres server runtime (what is used can be detected by
* dependency walker). Without correct linking the server crash when IO related
* functionality is used.
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_DEPRECATE
#endif
#include "postgres.h"
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include "executor/spi.h"
#include "access/htup_details.h"
#include "catalog/pg_type.h"
#include "fmgr.h"
#include "funcapi.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "port.h"
#include "storage/fd.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "orafce.h"
#include "builtins.h"
#ifndef ERRCODE_NO_DATA_FOUND
#define ERRCODE_NO_DATA_FOUND MAKE_SQLSTATE('P','0', '0','0','2')
#endif
#define INVALID_OPERATION "UTL_FILE_INVALID_OPERATION"
#define WRITE_ERROR "UTL_FILE_WRITE_ERROR"
#define READ_ERROR "UTL_FILE_READ_ERROR"
#define INVALID_FILEHANDLE "UTL_FILE_INVALID_FILEHANDLE"
#define INVALID_MAXLINESIZE "UTL_FILE_INVALID_MAXLINESIZE"
#define INVALID_MODE "UTL_FILE_INVALID_MODE"
#define INVALID_PATH "UTL_FILE_INVALID_PATH"
#define VALUE_ERROR "UTL_FILE_VALUE_ERROR"
PG_FUNCTION_INFO_V1(utl_file_fopen);
PG_FUNCTION_INFO_V1(utl_file_is_open);
PG_FUNCTION_INFO_V1(utl_file_get_line);
PG_FUNCTION_INFO_V1(utl_file_get_nextline);
PG_FUNCTION_INFO_V1(utl_file_put);
PG_FUNCTION_INFO_V1(utl_file_put_line);
PG_FUNCTION_INFO_V1(utl_file_new_line);
PG_FUNCTION_INFO_V1(utl_file_putf);
PG_FUNCTION_INFO_V1(utl_file_fflush);
PG_FUNCTION_INFO_V1(utl_file_fclose);
PG_FUNCTION_INFO_V1(utl_file_fclose_all);
PG_FUNCTION_INFO_V1(utl_file_fremove);
PG_FUNCTION_INFO_V1(utl_file_frename);
PG_FUNCTION_INFO_V1(utl_file_fcopy);
PG_FUNCTION_INFO_V1(utl_file_fgetattr);
PG_FUNCTION_INFO_V1(utl_file_tmpdir);
#define CUSTOM_EXCEPTION(msg, detail) \
ereport(ERROR, \
(errcode(ERRCODE_RAISE_EXCEPTION), \
errmsg("%s", msg), \
errdetail("%s", detail)))
#define STRERROR_EXCEPTION(msg) \
do { char *strerr = strerror(errno); CUSTOM_EXCEPTION(msg, strerr); } while(0);
#define INVALID_FILEHANDLE_EXCEPTION() CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "Used file handle isn't valid.")
#define CHECK_FILE_HANDLE() \
if (PG_ARGISNULL(0)) \
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "Used file handle isn't valid.")
#define NON_EMPTY_TEXT(dat) \
if (VARSIZE(dat) - VARHDRSZ == 0) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("invalid parameter"), \
errdetail("Empty string isn't allowed.")));
#define NOT_NULL_ARG(n) \
if (PG_ARGISNULL(n)) \
ereport(ERROR, \
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED), \
errmsg("null value not allowed"), \
errhint("%dth argument is NULL.", n)));
#define MAX_LINESIZE 32767
#define CHECK_LINESIZE(max_linesize) \
do { \
if ((max_linesize) < 1 || (max_linesize) > MAX_LINESIZE) \
CUSTOM_EXCEPTION(INVALID_MAXLINESIZE, "maxlinesize is out of range"); \
} while(0)
typedef struct FileSlot
{
FILE *file;
int max_linesize;
int encoding;
int32 id;
} FileSlot;
#define MAX_SLOTS 50 /* Oracle 10g supports 50 files */
#define INVALID_SLOTID 0 /* invalid slot id */
static FileSlot slots[MAX_SLOTS]; /* initilaized with zeros */
static int32 slotid = 0; /* next slot id */
static void check_secure_locality(const char *path);
static char *get_safe_path(text *location, text *filename);
static int copy_text_file(FILE *srcfile, FILE *dstfile,
int start_line, int end_line);
/*
* get_descriptor(FILE *file) find any free slot for FILE pointer.
* If isn't realloc array slots and add 32 new free slots.
*
*/
static int
get_descriptor(FILE *file, int max_linesize, int encoding)
{
int i;
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == INVALID_SLOTID)
{
slots[i].id = ++slotid;
if (slots[i].id == INVALID_SLOTID)
slots[i].id = ++slotid; /* skip INVALID_SLOTID */
slots[i].file = file;
slots[i].max_linesize = max_linesize;
slots[i].encoding = encoding;
return slots[i].id;
}
}
return INVALID_SLOTID;
}
/* return stored pointer to FILE */
static FILE *
get_stream(int d, size_t *max_linesize, int *encoding)
{
int i;
if (d == INVALID_SLOTID)
INVALID_FILEHANDLE_EXCEPTION();
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
{
if (max_linesize)
*max_linesize = slots[i].max_linesize;
if (encoding)
*encoding = slots[i].encoding;
return slots[i].file;
}
}
INVALID_FILEHANDLE_EXCEPTION();
return NULL; /* keep compiler quiet */
}
static void
IO_EXCEPTION(void)
{
switch (errno)
{
case EACCES:
case ENAMETOOLONG:
case ENOENT:
case ENOTDIR:
STRERROR_EXCEPTION(INVALID_PATH);
break;
default:
STRERROR_EXCEPTION(INVALID_OPERATION);
}
}
/*
* FUNCTION UTL_FILE.FOPEN(location text,
* filename text,
* open_mode text,
* max_linesize integer)
* RETURNS UTL_FILE.FILE_TYPE;
*
* The FOPEN function opens specified file and returns file handle.
* open_mode: ['R', 'W', 'A']
* max_linesize: [1 .. 32767]
*
* Exceptions:
* INVALID_MODE, INVALID_OPERATION, INVALID_PATH, INVALID_MAXLINESIZE
*/
Datum
utl_file_fopen(PG_FUNCTION_ARGS)
{
text *open_mode;
int max_linesize;
int encoding;
const char *mode = NULL;
FILE *file;
char *fullname;
int d;
NOT_NULL_ARG(0);
NOT_NULL_ARG(1);
NOT_NULL_ARG(2);
NOT_NULL_ARG(3);
open_mode = PG_GETARG_TEXT_P(2);
NON_EMPTY_TEXT(open_mode);
max_linesize = PG_GETARG_INT32(3);
CHECK_LINESIZE(max_linesize);
if (PG_NARGS() > 4 && !PG_ARGISNULL(4))
{
const char *encname = NameStr(*PG_GETARG_NAME(4));
encoding = pg_char_to_encoding(encname);
if (encoding < 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid encoding name \"%s\"", encname)));
}
else
encoding = GetDatabaseEncoding();
if (VARSIZE(open_mode) - VARHDRSZ != 1)
CUSTOM_EXCEPTION(INVALID_MODE, "open mode is different than [R,W,A]");
switch (*((char*)VARDATA(open_mode)))
{
case 'a':
case 'A':
mode = "a";
break;
case 'r':
case 'R':
mode = "r";
break;
case 'w':
case 'W':
mode = "w";
break;
default:
CUSTOM_EXCEPTION(INVALID_MODE, "open mode is different than [R,W,A]");
}
/* open file */
fullname = get_safe_path(PG_GETARG_TEXT_P(0), PG_GETARG_TEXT_P(1));
/*
* We cannot use AllocateFile here because those files are automatically
* closed at the end of (sub)transactions, but we want to keep them open
* for oracle compatibility.
*/
#if NOT_USED
fullname = convert_encoding_server_to_platform(fullname);
#endif
file = fopen(fullname, mode);
if (!file)
IO_EXCEPTION();
d = get_descriptor(file, max_linesize, encoding);
if (d == INVALID_SLOTID)
{
fclose(file);
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("program limit exceeded"),
errdetail("Too much concurent opened files"),
errhint("You can only open a maximum of ten files for each session")));
}
PG_RETURN_INT32(d);
}
Datum
utl_file_is_open(PG_FUNCTION_ARGS)
{
if (!PG_ARGISNULL(0))
{
int i;
int d = PG_GETARG_INT32(0);
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
PG_RETURN_BOOL(slots[i].file != NULL);
}
}
PG_RETURN_BOOL(false);
}
#define CHECK_LENGTH(l) \
if (l > max_linesize) \
CUSTOM_EXCEPTION(VALUE_ERROR, "buffer is too short");
/* read line from file. set eof if is EOF */
static text *
get_line(FILE *f, size_t max_linesize, int encoding, bool *iseof)
{
int c;
char *buffer = NULL;
char *bpt;
size_t csize = 0;
text *result = NULL;
bool eof = true;
buffer = palloc(max_linesize + 2);
bpt = buffer;
errno = 0;
while (csize < max_linesize && (c = fgetc(f)) != EOF)
{
eof = false; /* I was able read one char */
if (c == '\r') /* lookin ahead \n */
{
c = fgetc(f);
if (c == EOF)
break; /* last char */
if (c != '\n')
ungetc(c, f);
/* skip \r\n */
break;
}
else if (c == '\n')
break;
++csize;
*bpt++ = c;
}
if (!eof)
{
char *decoded;
size_t len;
pg_verify_mbstr(encoding, buffer, size2int(csize), false);
decoded = (char *) pg_do_encoding_conversion((unsigned char *) buffer,
size2int(csize), encoding, GetDatabaseEncoding());
len = (decoded == buffer ? csize : strlen(decoded));
result = palloc(len + VARHDRSZ);
memcpy(VARDATA(result), decoded, len);
SET_VARSIZE(result, len + VARHDRSZ);
if (decoded != buffer)
pfree(decoded);
*iseof = false;
}
else
{
switch (errno)
{
case 0:
break;
case EBADF:
CUSTOM_EXCEPTION(INVALID_OPERATION, "file descriptor isn't valid for reading");
break;
default:
STRERROR_EXCEPTION(READ_ERROR);
break;
}
*iseof = true;
}
pfree(buffer);
return result;
}
/*
* FUNCTION UTL_FILE.GET_LINE(file UTL_TYPE.FILE_TYPE, line int DEFAULT NULL)
* RETURNS text;
*
* Reads one line from file.
*
* Exceptions:
* NO_DATA_FOUND, INVALID_FILEHANDLE, INVALID_OPERATION, READ_ERROR
*/
Datum
utl_file_get_line(PG_FUNCTION_ARGS)
{
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
FILE *f;
text *result;
bool iseof;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
/* 'len' overwrites max_linesize, but must be smaller than max_linesize */
if (PG_NARGS() > 1 && !PG_ARGISNULL(1))
{
size_t len = (size_t) PG_GETARG_INT32(1);
CHECK_LINESIZE(len);
if (max_linesize > len)
max_linesize = len;
}
result = get_line(f, max_linesize, encoding, &iseof);
if (iseof)
ereport(ERROR,
(errcode(ERRCODE_NO_DATA_FOUND),
errmsg("no data found")));
PG_RETURN_TEXT_P(result);
}
/*
* FUNCTION UTL_FILE.GET_NEXTLINE(file UTL_TYPE.FILE_TYPE)
* RETURNS text;
*
* Reads one line from file or retutns NULL
* by Steven Feuerstein.
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, READ_ERROR
*/
Datum
utl_file_get_nextline(PG_FUNCTION_ARGS)
{
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
FILE *f;
text *result;
bool iseof;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
result = get_line(f, max_linesize, encoding, &iseof);
if (iseof)
PG_RETURN_NULL();
PG_RETURN_TEXT_P(result);
}
static void
do_flush(FILE *f)
{
if (fflush(f) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_OPERATION, "File is not an opened, or is not open for writing");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
}
/*
* FUNCTION UTL_FILE.PUT(file UTL_FILE.FILE_TYPE, buffer text)
* RETURNS bool;
*
* The PUT function puts data out to specified file. Buffer length allowed is
* 32K or 1024 (max_linesize);
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR, VALUE_ERROR
*
* Note: returns bool because I cannot do envelope over void function
*/
#define CHECK_ERRNO_PUT() \
switch (errno) \
{ \
case EBADF: \
CUSTOM_EXCEPTION(INVALID_OPERATION, "file descriptor isn't valid for writing"); \
break; \
default: \
STRERROR_EXCEPTION(WRITE_ERROR); \
}
/* encode(t, encoding) */
static char *
encode_text(int encoding, text *t, size_t *length)
{
char *src = VARDATA_ANY(t);
char *encoded;
encoded = (char *) pg_do_encoding_conversion((unsigned char *) src,
VARSIZE_ANY_EXHDR(t), GetDatabaseEncoding(), encoding);
*length = (src == encoded ? VARSIZE_ANY_EXHDR(t) : strlen(encoded));
return encoded;
}
/* fwrite(encode(args[n], encoding), f) */
static size_t
do_write(PG_FUNCTION_ARGS, int n, FILE *f, size_t max_linesize, int encoding)
{
text *arg = PG_GETARG_TEXT_P(n);
char *str;
size_t len;
str = encode_text(encoding, arg, &len);
CHECK_LENGTH(len);
if (fwrite(str, 1, len, f) != len)
CHECK_ERRNO_PUT();
if (VARDATA(arg) != str)
pfree(str);
PG_FREE_IF_COPY(arg, n);
return len;
}
static FILE *
do_put(PG_FUNCTION_ARGS)
{
FILE *f;
size_t max_linesize = 0; /* keep compiler quiet */
int encoding = 0; /* keep compiler quiet */
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
NOT_NULL_ARG(1);
do_write(fcinfo, 1, f, max_linesize, encoding);
return f;
}
Datum
utl_file_put(PG_FUNCTION_ARGS)
{
do_put(fcinfo);
PG_RETURN_BOOL(true);
}
static void
do_new_line(FILE *f, int lines)
{
int i;
for (i = 0; i < lines; i++)
{
#ifndef WIN32
if (fputc('\n', f) == EOF)
CHECK_ERRNO_PUT();
#else
if (fputs("\r\n", f) == EOF)
CHECK_ERRNO_PUT();
#endif
}
}
Datum
utl_file_put_line(PG_FUNCTION_ARGS)
{
FILE *f;
bool autoflush;
f = do_put(fcinfo);
autoflush = PG_GETARG_IF_EXISTS(2, BOOL, false);
do_new_line(f, 1);
if (autoflush)
do_flush(f);
PG_RETURN_BOOL(true);
}
Datum
utl_file_new_line(PG_FUNCTION_ARGS)
{
FILE *f;
int lines;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), NULL, NULL);
lines = PG_GETARG_IF_EXISTS(1, INT32, 1);
do_new_line(f, lines);
PG_RETURN_BOOL(true);
}
/*
* FUNCTION UTL_FILE.PUTF(file UTL_FILE.FILE_TYPE,
* format text,
* arg1 text,
* arg2 text,
* arg3 text,
* arg4 text,
* arg5 text)
* RETURNS bool;
*
* Puts formated data to file. Allows %s like subst symbol.
*
* Exception:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR
*/
Datum
utl_file_putf(PG_FUNCTION_ARGS)
{
FILE *f;
char *format;
size_t max_linesize;
int encoding;
size_t format_length;
char *fpt;
int cur_par = 0;
size_t cur_len = 0;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), &max_linesize, &encoding);
NOT_NULL_ARG(1);
format = encode_text(encoding, PG_GETARG_TEXT_P(1), &format_length);
for (fpt = format; format_length > 0; fpt++, format_length--)
{
if (format_length == 1)
{
/* last char */
CHECK_LENGTH(++cur_len);
if (fputc(*fpt, f) == EOF)
CHECK_ERRNO_PUT();
continue;
}
/* ansi compatible string */
if (fpt[0] == '\\' && fpt[1] == 'n')
{
CHECK_LENGTH(++cur_len);
if (fputc('\n', f) == EOF)
CHECK_ERRNO_PUT();
fpt++; format_length--;
continue;
}
if (fpt[0] == '%')
{
if (fpt[1] == '%')
{
CHECK_LENGTH(++cur_len);
if (fputc('%', f) == EOF)
CHECK_ERRNO_PUT();
}
else if (fpt[1] == 's' && ++cur_par <= 5 && !PG_ARGISNULL(cur_par + 1))
{
cur_len += do_write(fcinfo, cur_par + 1, f, max_linesize - cur_len, encoding);
}
fpt++; format_length--;
continue;
}
CHECK_LENGTH(++cur_len);
if (fputc(fpt[0], f) == EOF)
CHECK_ERRNO_PUT();
}
PG_RETURN_BOOL(true);
}
/*
* FUNCTION UTL_FILE.FFLUSH(file UTL_FILE.FILE_TYPE)
* RETURNS void;
*
* This function makes sure that all pending data for the specified file is written
* physically out to file.
*
* Exceptions:
* INVALID_FILEHANDLE, INVALID_OPERATION, WRITE_ERROR
*/
Datum
utl_file_fflush(PG_FUNCTION_ARGS)
{
FILE *f;
CHECK_FILE_HANDLE();
f = get_stream(PG_GETARG_INT32(0), NULL, NULL);
do_flush(f);
PG_RETURN_VOID();
}
/*
* FUNCTION UTL_FILE.FCLOSE(file UTL_FILE.FILE_TYPE)
* RETURNS NULL
*
* Close an open file. This function reset file handle to NULL on Oracle platform.
* It isn't possible in PostgreSQL, and then you have to call fclose function
* like:
* file := utl_file.fclose(file);
*
* Exception:
* INVALID_FILEHANDLE, WRITE_ERROR
*/
Datum
utl_file_fclose(PG_FUNCTION_ARGS)
{
int i;
int d = PG_GETARG_INT32(0);
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id == d)
{
if (slots[i].file && fclose(slots[i].file) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "File is not an opened");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
slots[i].file = NULL;
slots[i].id = INVALID_SLOTID;
PG_RETURN_NULL();
}
}
INVALID_FILEHANDLE_EXCEPTION();
PG_RETURN_NULL();
}
/*
* FUNCTION UTL_FILE.FCLOSE_ALL()
* RETURNS void
*
* Close all opened files.
*
* Exceptions: WRITE_ERROR
*/
Datum
utl_file_fclose_all(PG_FUNCTION_ARGS)
{
int i;
for (i = 0; i < MAX_SLOTS; i++)
{
if (slots[i].id != INVALID_SLOTID)
{
if (slots[i].file && fclose(slots[i].file) != 0)
{
if (errno == EBADF)
CUSTOM_EXCEPTION(INVALID_FILEHANDLE, "File is not an opened");
else
STRERROR_EXCEPTION(WRITE_ERROR);
}
slots[i].file = NULL;
slots[i].id = INVALID_SLOTID;
}
}
PG_RETURN_VOID();
}
/*
* utl_file_dir security .. is solved with aux. table.
*
* Raise exception if don't find string in table.
*/
static void
check_secure_locality(const char *path)
{
static SPIPlanPtr plan = NULL;
Oid argtypes[] = {TEXTOID};
Datum values[1];
char nulls[1] = {' '};
values[0] = CStringGetTextDatum(path);
/*
* SELECT 1 FROM utl_file.utl_file_dir
* WHERE CASE WHEN substring(dir from '.$') = '/' THEN
* substring($1, 1, length(dir)) = dir
* ELSE
* substring($1, 1, length(dir) + 1) = dir || '/'
* END
*/
if (SPI_connect() < 0)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_connect failed")));
if (!plan)
{
/* Don't use LIKE not to escape '_' and '%' */
SPIPlanPtr p = SPI_prepare(
"SELECT 1 FROM utl_file.utl_file_dir"
" WHERE CASE WHEN substring(dir from '.$') = '/' THEN"
" substring($1, 1, length(dir)) = dir"
" ELSE"
" substring($1, 1, length(dir) + 1) = dir || '/'"
" END",
1, argtypes);
if (p == NULL || (plan = SPI_saveplan(p)) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_prepare_failed")));
}
if (SPI_OK_SELECT != SPI_execute_plan(plan, values, nulls, false, 1))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("can't execute sql")));
if (SPI_processed == 0)
ereport(ERROR,
(errcode(ERRCODE_RAISE_EXCEPTION),
errmsg(INVALID_PATH),
errdetail("you cannot access locality"),
errhint("locality is not found in utl_file_dir table")));
SPI_finish();
}
static char *
safe_named_location(text *location)
{
static SPIPlanPtr plan = NULL;
MemoryContext old_cxt;
Oid argtypes[] = {TEXTOID};
Datum values[1];
char nulls[1] = {' '};
char *result;
old_cxt = CurrentMemoryContext;
values[0] = PointerGetDatum(location);
if (SPI_connect() < 0)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_connect failed")));
if (!plan)
{
/* Don't use LIKE not to escape '_' and '%' */
SPIPlanPtr p = SPI_prepare(
"SELECT dir FROM utl_file.utl_file_dir WHERE dirname = $1",
1, argtypes);
if (p == NULL || (plan = SPI_saveplan(p)) == NULL)
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("SPI_prepare_failed")));
}
if (SPI_OK_SELECT != SPI_execute_plan(plan, values, nulls, false, 1))
ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR),
errmsg("can't execute sql")));
if (SPI_processed > 0)
{
char *loc = SPI_getvalue(SPI_tuptable->vals[0],
SPI_tuptable->tupdesc, 1);
if (loc)
result = MemoryContextStrdup(old_cxt, loc);
else
result = NULL;
}
else
result = NULL;
SPI_finish();
MemoryContextSwitchTo(old_cxt);
return result;
}
/*
* get_safe_path - make a fullpath and check security.
*/
static char *
get_safe_path(text *location_or_dirname, text *filename)
{
char *fullname;
char *location;
bool check_locality;
NON_EMPTY_TEXT(location_or_dirname);
NON_EMPTY_TEXT(filename);
location = safe_named_location(location_or_dirname);
if (location)
{
int aux_pos = size2int(strlen(location));
int aux_len = VARSIZE_ANY_EXHDR(filename);
fullname = palloc(aux_pos + 1 + aux_len + 1);
strcpy(fullname, location);
fullname[aux_pos] = '/';
memcpy(fullname + aux_pos + 1, VARDATA(filename), aux_len);
fullname[aux_pos + aux_len + 1] = '\0';
/* location is safe (ensured by dirname) */
check_locality = false;
pfree(location);
}
else
{
int aux_pos = VARSIZE_ANY_EXHDR(location_or_dirname);
int aux_len = VARSIZE_ANY_EXHDR(filename);
fullname = palloc(aux_pos + 1 + aux_len + 1);
memcpy(fullname, VARDATA(location_or_dirname), aux_pos);
fullname[aux_pos] = '/';
memcpy(fullname + aux_pos + 1, VARDATA(filename), aux_len);
fullname[aux_pos + aux_len + 1] = '\0';
check_locality = true;
}
/* check locality in canonizalized form of path */
canonicalize_path(fullname);
if (check_locality)
check_secure_locality(fullname);
return fullname;
}
/*
* CREATE FUNCTION utl_file.fremove(
* location text,
* filename text)
*/
Datum
utl_file_fremove(PG_FUNCTION_ARGS)
{
char *fullname;
NOT_NULL_ARG(0);
NOT_NULL_ARG(1);
fullname = get_safe_path(PG_GETARG_TEXT_P(0), PG_GETARG_TEXT_P(1));
if (unlink(fullname) != 0)
IO_EXCEPTION();
PG_RETURN_VOID();
}
/*
* CREATE FUNCTION utl_file.frename(
* location text,
* filename text,
* dest_dir text,
* dest_file text,
* overwrite boolean DEFAULT false)
*/
Datum
utl_file_frename(PG_FUNCTION_ARGS)
{
char *srcpath;
char *dstpath;
bool overwrite;
NOT_NULL_ARG(0);
NOT_NULL_ARG(1);
NOT_NULL_ARG(2);
NOT_NULL_ARG(3);
overwrite = PG_GETARG_IF_EXISTS(4, BOOL, false);
srcpath = get_safe_path(PG_GETARG_TEXT_P(0), PG_GETARG_TEXT_P(1));
dstpath = get_safe_path(PG_GETARG_TEXT_P(2), PG_GETARG_TEXT_P(3));
if (!overwrite)
{
struct stat st;
if (stat(dstpath, &st) == 0)
CUSTOM_EXCEPTION(WRITE_ERROR, "File exists");
else if (errno != ENOENT)
IO_EXCEPTION();