Add mkdtemp() to libpgport.

nmisch · nmisch · commit 52c37346aa51 · 2014-06-14T09:41:18.000-04:00
This function is pervasive on free software operating systems; import
NetBSD's implementation.  Back-patch to 8.4, like the commit that will
harness it.
diff --git a/configure b/configure
@@ -20328,7 +20328,8 @@ fi
 
 
 
-for ac_func in crypt erand48 getopt getrusage inet_aton random rint srandom strdup strerror strlcat strlcpy strtol strtoul
+
+for ac_func in crypt erand48 getopt getrusage inet_aton mkdtemp random rint srandom strdup strerror strlcat strlcpy strtol strtoul
 do
 as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { $as_echo "$as_me:$LINENO: checking for $ac_func" >&5
diff --git a/configure.in b/configure.in
@@ -1295,7 +1295,7 @@ else
   AC_CHECK_FUNCS([fpclass fp_class fp_class_d class], [break])
 fi
 
-AC_REPLACE_FUNCS([crypt erand48 getopt getrusage inet_aton random rint srandom strdup strerror strlcat strlcpy strtol strtoul])
+AC_REPLACE_FUNCS([crypt erand48 getopt getrusage inet_aton mkdtemp random rint srandom strdup strerror strlcat strlcpy strtol strtoul])
 
 case $host_os in
 
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
@@ -345,6 +345,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
+/* Define to 1 if you have the `mkdtemp' function. */
+#undef HAVE_MKDTEMP
+
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #undef HAVE_NETINET_IN_H
 
diff --git a/src/include/pg_config.h.win32 b/src/include/pg_config.h.win32
@@ -258,6 +258,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #define HAVE_MEMORY_H 1
 
+/* Define to 1 if you have the `mkdtemp' function. */
+/* #undef HAVE_MKDTEMP */
+
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #define HAVE_NETINET_IN_H 1
 
diff --git a/src/include/port.h b/src/include/port.h
@@ -464,4 +464,7 @@ extern void qsort_arg(void *base, size_t nel, size_t elsize,
 /* port/chklocale.c */
 extern int	pg_get_encoding_from_locale(const char *ctype);
 
+/* port/mkdtemp.c */
+extern char *mkdtemp(char *path);
+
 #endif   /* PG_PORT_H */
diff --git a/src/port/mkdtemp.c b/src/port/mkdtemp.c
@@ -0,0 +1,293 @@
+/*-------------------------------------------------------------------------
+ *
+ * mkdtemp.c
+ *	  create a mode-0700 temporary directory
+ *
+ * Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
+ *
+ *
+ * IDENTIFICATION
+ *	  src/port/mkdtemp.c
+ *
+ * This code was taken from NetBSD to provide an implementation for platforms
+ * that lack it.  (Among compatibly-licensed implementations, the OpenBSD
+ * version better resists denial-of-service attacks.  However, it has a
+ * cryptographic dependency.)  The NetBSD copyright terms follow.
+ *-------------------------------------------------------------------------
+ */
+
+#include "c.h"
+
+#define _DIAGASSERT(x) do {} while (0)
+
+
+/*	$NetBSD: gettemp.c,v 1.17 2014/01/21 19:09:48 seanb Exp $	*/
+
+/*
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *	  notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *	  notice, this list of conditions and the following disclaimer in the
+ *	  documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *	  may be used to endorse or promote products derived from this software
+ *	  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+#endif
+
+#if !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP || !HAVE_MKDTEMP
+
+#ifdef NOT_POSTGRESQL
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: gettemp.c,v 1.17 2014/01/21 19:09:48 seanb Exp $");
+#endif
+#endif   /* LIBC_SCCS and not lint */
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#ifdef NOT_POSTGRESQL
+#if HAVE_NBTOOL_CONFIG_H
+#define GETTEMP		__nbcompat_gettemp
+#else
+#include "reentrant.h"
+#include "local.h"
+#define GETTEMP		__gettemp
+#endif
+#endif
+
+static int
+GETTEMP(char *path, int *doopen, int domkdir)
+{
+	char	   *start,
+			   *trv;
+	struct stat sbuf;
+	u_int		pid;
+
+	/*
+	 * To guarantee multiple calls generate unique names even if the file is
+	 * not created. 676 different possibilities with 7 or more X's, 26 with 6
+	 * or less.
+	 */
+	static char xtra[2] = "aa";
+	int			xcnt = 0;
+
+	_DIAGASSERT(path != NULL);
+	/* doopen may be NULL */
+
+	pid = getpid();
+
+	/* Move to end of path and count trailing X's. */
+	for (trv = path; *trv; ++trv)
+		if (*trv == 'X')
+			xcnt++;
+		else
+			xcnt = 0;
+
+	/* Use at least one from xtra.  Use 2 if more than 6 X's. */
+	if (xcnt > 0)
+	{
+		*--trv = xtra[0];
+		xcnt--;
+	}
+	if (xcnt > 5)
+	{
+		*--trv = xtra[1];
+		xcnt--;
+	}
+
+	/* Set remaining X's to pid digits with 0's to the left. */
+	for (; xcnt > 0; xcnt--)
+	{
+		*--trv = (pid % 10) + '0';
+		pid /= 10;
+	}
+
+	/* update xtra for next call. */
+	if (xtra[0] != 'z')
+		xtra[0]++;
+	else
+	{
+		xtra[0] = 'a';
+		if (xtra[1] != 'z')
+			xtra[1]++;
+		else
+			xtra[1] = 'a';
+	}
+
+	/*
+	 * check the target directory; if you have six X's and it doesn't exist
+	 * this runs for a *very* long time.
+	 */
+	for (start = trv + 1;; --trv)
+	{
+		if (trv <= path)
+			break;
+		if (*trv == '/')
+		{
+			int			e;
+
+			*trv = '\0';
+			e = stat(path, &sbuf);
+			*trv = '/';
+			if (e == -1)
+				return doopen == NULL && !domkdir;
+			if (!S_ISDIR(sbuf.st_mode))
+			{
+				errno = ENOTDIR;
+				return doopen == NULL && !domkdir;
+			}
+			break;
+		}
+	}
+
+	for (;;)
+	{
+		if (doopen)
+		{
+			if ((*doopen =
+				 open(path, O_CREAT | O_EXCL | O_RDWR, 0600)) >= 0)
+				return 1;
+			if (errno != EEXIST)
+				return 0;
+		}
+		else if (domkdir)
+		{
+			if (mkdir(path, 0700) >= 0)
+				return 1;
+			if (errno != EEXIST)
+				return 0;
+		}
+		else if (lstat(path, &sbuf))
+			return errno == ENOENT ? 1 : 0;
+
+		/* tricky little algorithm for backward compatibility */
+		for (trv = start;;)
+		{
+			if (!*trv)
+				return 0;
+			if (*trv == 'z')
+				*trv++ = 'a';
+			else
+			{
+				if (isdigit((unsigned char) *trv))
+					*trv = 'a';
+				else
+					++* trv;
+				break;
+			}
+		}
+	}
+	/* NOTREACHED */
+}
+
+#endif   /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKSTEMP ||
+								 * !HAVE_MKDTEMP */
+
+
+/*	$NetBSD: mkdtemp.c,v 1.11 2012/03/15 18:22:30 christos Exp $	*/
+
+/*
+ * Copyright (c) 1987, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *	  notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *	  notice, this list of conditions and the following disclaimer in the
+ *	  documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *	  may be used to endorse or promote products derived from this software
+ *	  without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+#endif
+
+#if !HAVE_NBTOOL_CONFIG_H || !HAVE_MKDTEMP
+
+#ifdef NOT_POSTGRESQL
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)mktemp.c	8.1 (Berkeley) 6/4/93";
+#else
+__RCSID("$NetBSD: mkdtemp.c,v 1.11 2012/03/15 18:22:30 christos Exp $");
+#endif
+#endif   /* LIBC_SCCS and not lint */
+
+#if HAVE_NBTOOL_CONFIG_H
+#define GETTEMP		__nbcompat_gettemp
+#else
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "reentrant.h"
+#include "local.h"
+#define GETTEMP		__gettemp
+#endif
+
+#endif
+
+char *
+mkdtemp(char *path)
+{
+	_DIAGASSERT(path != NULL);
+
+	return GETTEMP(path, NULL, 1) ? path : NULL;
+}
+
+#endif   /* !HAVE_NBTOOL_CONFIG_H || !HAVE_MKDTEMP */
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
@@ -50,7 +50,7 @@ sub mkvcbuild
 
     our @pgportfiles = qw(
       chklocale.c crypt.c fseeko.c getrusage.c inet_aton.c random.c srandom.c
-      getaddrinfo.c gettimeofday.c kill.c open.c erand48.c
+      getaddrinfo.c gettimeofday.c kill.c open.c erand48.c mkdtemp.c
       snprintf.c strlcat.c strlcpy.c dirmod.c exec.c noblock.c path.c pipe.c
       pgsleep.c pgstrcasecmp.c qsort.c qsort_arg.c sprompt.c thread.c
       getopt.c getopt_long.c dirent.c rint.c win32env.c win32error.c);
