mirror of
https://github.com/postgres/postgres.git
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384 lines
8.3 KiB
C
384 lines
8.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* adminpack.c
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*
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*
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* Copyright (c) 2002-2016, PostgreSQL Global Development Group
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*
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* Author: Andreas Pflug <pgadmin@pse-consulting.de>
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*
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* IDENTIFICATION
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* contrib/adminpack/adminpack.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "catalog/pg_type.h"
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#include "funcapi.h"
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#include "miscadmin.h"
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#include "postmaster/syslogger.h"
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#include "storage/fd.h"
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#include "utils/builtins.h"
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#include "utils/datetime.h"
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#ifdef WIN32
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#ifdef rename
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#undef rename
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#endif
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#ifdef unlink
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#undef unlink
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#endif
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#endif
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PG_MODULE_MAGIC;
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PG_FUNCTION_INFO_V1(pg_file_write);
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PG_FUNCTION_INFO_V1(pg_file_rename);
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PG_FUNCTION_INFO_V1(pg_file_unlink);
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PG_FUNCTION_INFO_V1(pg_logdir_ls);
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typedef struct
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{
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char *location;
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DIR *dirdesc;
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} directory_fctx;
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/*-----------------------
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* some helper functions
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*/
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/*
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* Convert a "text" filename argument to C string, and check it's allowable.
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*
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* Filename may be absolute or relative to the DataDir, but we only allow
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* absolute paths that match DataDir or Log_directory.
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*/
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static char *
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convert_and_check_filename(text *arg, bool logAllowed)
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{
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char *filename = text_to_cstring(arg);
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canonicalize_path(filename); /* filename can change length here */
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if (is_absolute_path(filename))
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{
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/* Disallow '/a/b/data/..' */
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if (path_contains_parent_reference(filename))
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("reference to parent directory (\"..\") not allowed"))));
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/*
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* Allow absolute paths if within DataDir or Log_directory, even
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* though Log_directory might be outside DataDir.
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*/
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if (!path_is_prefix_of_path(DataDir, filename) &&
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(!logAllowed || !is_absolute_path(Log_directory) ||
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!path_is_prefix_of_path(Log_directory, filename)))
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("absolute path not allowed"))));
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}
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else if (!path_is_relative_and_below_cwd(filename))
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("path must be in or below the current directory"))));
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return filename;
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}
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/*
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* check for superuser, bark if not.
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*/
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static void
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requireSuperuser(void)
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{
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("only superuser may access generic file functions"))));
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}
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/* ------------------------------------
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* generic file handling functions
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*/
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Datum
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pg_file_write(PG_FUNCTION_ARGS)
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{
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FILE *f;
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char *filename;
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text *data;
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int64 count = 0;
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requireSuperuser();
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filename = convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
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data = PG_GETARG_TEXT_P(1);
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if (!PG_GETARG_BOOL(2))
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{
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struct stat fst;
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if (stat(filename, &fst) >= 0)
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ereport(ERROR,
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(ERRCODE_DUPLICATE_FILE,
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errmsg("file \"%s\" exists", filename)));
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f = fopen(filename, "wb");
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}
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else
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f = fopen(filename, "ab");
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if (!f)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not open file \"%s\" for writing: %m",
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filename)));
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if (VARSIZE(data) != 0)
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{
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count = fwrite(VARDATA(data), 1, VARSIZE(data) - VARHDRSZ, f);
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if (count != VARSIZE(data) - VARHDRSZ)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not write file \"%s\": %m", filename)));
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}
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fclose(f);
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PG_RETURN_INT64(count);
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}
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Datum
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pg_file_rename(PG_FUNCTION_ARGS)
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{
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char *fn1,
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*fn2,
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*fn3;
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int rc;
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requireSuperuser();
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if (PG_ARGISNULL(0) || PG_ARGISNULL(1))
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PG_RETURN_NULL();
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fn1 = convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
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fn2 = convert_and_check_filename(PG_GETARG_TEXT_P(1), false);
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if (PG_ARGISNULL(2))
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fn3 = 0;
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else
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fn3 = convert_and_check_filename(PG_GETARG_TEXT_P(2), false);
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if (access(fn1, W_OK) < 0)
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{
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ereport(WARNING,
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(errcode_for_file_access(),
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errmsg("file \"%s\" is not accessible: %m", fn1)));
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PG_RETURN_BOOL(false);
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}
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if (fn3 && access(fn2, W_OK) < 0)
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{
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ereport(WARNING,
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(errcode_for_file_access(),
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errmsg("file \"%s\" is not accessible: %m", fn2)));
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PG_RETURN_BOOL(false);
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}
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rc = access(fn3 ? fn3 : fn2, 2);
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if (rc >= 0 || errno != ENOENT)
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{
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ereport(ERROR,
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(ERRCODE_DUPLICATE_FILE,
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errmsg("cannot rename to target file \"%s\"",
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fn3 ? fn3 : fn2)));
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}
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if (fn3)
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{
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if (rename(fn2, fn3) != 0)
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{
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not rename \"%s\" to \"%s\": %m",
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fn2, fn3)));
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}
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if (rename(fn1, fn2) != 0)
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{
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ereport(WARNING,
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(errcode_for_file_access(),
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errmsg("could not rename \"%s\" to \"%s\": %m",
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fn1, fn2)));
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if (rename(fn3, fn2) != 0)
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{
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not rename \"%s\" back to \"%s\": %m",
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fn3, fn2)));
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}
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else
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{
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ereport(ERROR,
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(ERRCODE_UNDEFINED_FILE,
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errmsg("renaming \"%s\" to \"%s\" was reverted",
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fn2, fn3)));
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}
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}
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}
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else if (rename(fn1, fn2) != 0)
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{
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not rename \"%s\" to \"%s\": %m", fn1, fn2)));
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}
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PG_RETURN_BOOL(true);
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}
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Datum
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pg_file_unlink(PG_FUNCTION_ARGS)
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{
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char *filename;
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requireSuperuser();
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filename = convert_and_check_filename(PG_GETARG_TEXT_P(0), false);
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if (access(filename, W_OK) < 0)
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{
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if (errno == ENOENT)
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PG_RETURN_BOOL(false);
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else
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("file \"%s\" is not accessible: %m", filename)));
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}
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if (unlink(filename) < 0)
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{
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ereport(WARNING,
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(errcode_for_file_access(),
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errmsg("could not unlink file \"%s\": %m", filename)));
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PG_RETURN_BOOL(false);
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}
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PG_RETURN_BOOL(true);
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}
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Datum
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pg_logdir_ls(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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struct dirent *de;
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directory_fctx *fctx;
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if (!superuser())
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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(errmsg("only superuser can list the log directory"))));
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if (strcmp(Log_filename, "postgresql-%Y-%m-%d_%H%M%S.log") != 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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(errmsg("the log_filename parameter must equal 'postgresql-%%Y-%%m-%%d_%%H%%M%%S.log'"))));
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if (SRF_IS_FIRSTCALL())
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{
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MemoryContext oldcontext;
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TupleDesc tupdesc;
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funcctx = SRF_FIRSTCALL_INIT();
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
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fctx = palloc(sizeof(directory_fctx));
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tupdesc = CreateTemplateTupleDesc(2, false);
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TupleDescInitEntry(tupdesc, (AttrNumber) 1, "starttime",
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TIMESTAMPOID, -1, 0);
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TupleDescInitEntry(tupdesc, (AttrNumber) 2, "filename",
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TEXTOID, -1, 0);
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funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
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fctx->location = pstrdup(Log_directory);
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fctx->dirdesc = AllocateDir(fctx->location);
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if (!fctx->dirdesc)
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not read directory \"%s\": %m",
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fctx->location)));
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funcctx->user_fctx = fctx;
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MemoryContextSwitchTo(oldcontext);
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}
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funcctx = SRF_PERCALL_SETUP();
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fctx = (directory_fctx *) funcctx->user_fctx;
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while ((de = ReadDir(fctx->dirdesc, fctx->location)) != NULL)
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{
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char *values[2];
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HeapTuple tuple;
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char timestampbuf[32];
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char *field[MAXDATEFIELDS];
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char lowstr[MAXDATELEN + 1];
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int dtype;
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int nf,
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ftype[MAXDATEFIELDS];
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fsec_t fsec;
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int tz = 0;
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struct pg_tm date;
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/*
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* Default format: postgresql-YYYY-MM-DD_HHMMSS.log
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*/
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if (strlen(de->d_name) != 32
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|| strncmp(de->d_name, "postgresql-", 11) != 0
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|| de->d_name[21] != '_'
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|| strcmp(de->d_name + 28, ".log") != 0)
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continue;
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/* extract timestamp portion of filename */
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strcpy(timestampbuf, de->d_name + 11);
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timestampbuf[17] = '\0';
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/* parse and decode expected timestamp to verify it's OK format */
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if (ParseDateTime(timestampbuf, lowstr, MAXDATELEN, field, ftype, MAXDATEFIELDS, &nf))
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continue;
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if (DecodeDateTime(field, ftype, nf, &dtype, &date, &fsec, &tz))
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continue;
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/* Seems the timestamp is OK; prepare and return tuple */
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values[0] = timestampbuf;
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values[1] = psprintf("%s/%s", fctx->location, de->d_name);
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tuple = BuildTupleFromCStrings(funcctx->attinmeta, values);
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SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
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}
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FreeDir(fctx->dirdesc);
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SRF_RETURN_DONE(funcctx);
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}
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