Adding upstream version 1.9.5p2.upstream/1.9.5p2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 244 insertions, 0 deletions

diff --git a/lib/util/getcwd.c b/lib/util/getcwd.c
new file mode 100644
index 0000000..2ad3d37
--- /dev/null
+++ b/lib/util/getcwd.c
@@ -0,0 +1,244 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1989, 1991, 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.
+ */
+
+#include <config.h>
+
+#ifndef HAVE_GETCWD
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <limits.h>
+
+#include "sudo_compat.h"
+
+#define	ISDOT(dp) \
+	(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
+	    (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
+
+#if defined(HAVE_STRUCT_DIRENT_D_NAMLEN) && HAVE_STRUCT_DIRENT_D_NAMLEN
+# define NAMLEN(dirent)	(dirent)->d_namlen
+#else
+# define NAMLEN(dirent)	strlen((dirent)->d_name)
+#endif
+
+char *
+sudo_getcwd(char *pt, size_t size)
+{
+	struct dirent *dp;
+	DIR *dir = NULL;
+	dev_t dev;
+	ino_t ino;
+	int first;
+	char *bpt, *bup;
+	struct stat s;
+	dev_t root_dev;
+	ino_t root_ino;
+	size_t ptsize, upsize;
+	int save_errno;
+	char *ept, *eup, *up;
+
+	/*
+	 * If no buffer specified by the user, allocate one as necessary.
+	 * If a buffer is specified, the size has to be non-zero.  The path
+	 * is built from the end of the buffer backwards.
+	 */
+	if (pt) {
+		ptsize = 0;
+		if (!size) {
+			errno = EINVAL;
+			return NULL;
+		}
+		ept = pt + size;
+	} else {
+		if ((pt = malloc(ptsize = 1024 - 4)) == NULL)
+			return NULL;
+		ept = pt + ptsize;
+	}
+	bpt = ept - 1;
+	*bpt = '\0';
+
+	/*
+	 * Allocate bytes (1024 - malloc space) for the string of "../"'s.
+	 * Should always be enough (it's 340 levels).  If it's not, allocate
+	 * as necessary.  Special * case the first stat, it's ".", not "..".
+	 */
+	if ((up = malloc(upsize = 1024 - 4)) == NULL)
+		goto err;
+	eup = up + PATH_MAX;
+	bup = up;
+	up[0] = '.';
+	up[1] = '\0';
+
+	/* Save root values, so know when to stop. */
+	if (stat("/", &s))
+		goto err;
+	root_dev = s.st_dev;
+	root_ino = s.st_ino;
+
+	errno = 0;			/* XXX readdir has no error return. */
+
+	for (first = 1;; first = 0) {
+		/* Stat the current level. */
+		if (lstat(up, &s))
+			goto err;
+
+		/* Save current node values. */
+		ino = s.st_ino;
+		dev = s.st_dev;
+
+		/* Check for reaching root. */
+		if (root_dev == dev && root_ino == ino) {
+			*--bpt = '/';
+			/*
+			 * It's unclear that it's a requirement to copy the
+			 * path to the beginning of the buffer, but it's always
+			 * been that way and stuff would probably break.
+			 */
+			memcpy(pt, bpt, ept - bpt);
+			free(up);
+			return pt;
+		}
+
+		/*
+		 * Build pointer to the parent directory, allocating memory
+		 * as necessary.  Max length is 3 for "../", the largest
+		 * possible component name, plus a trailing NULL.
+		 */
+		if (bup + 3  + MAXNAMLEN + 1 >= eup) {
+			char *nup;
+
+			if ((nup = reallocarray(up, upsize, 2)) == NULL)
+				goto err;
+			upsize *= 2;
+			up = nup;
+			bup = up;
+			eup = up + upsize;
+		}
+		*bup++ = '.';
+		*bup++ = '.';
+		*bup = '\0';
+
+		/* Open and stat parent directory. */
+		if (!(dir = opendir(up)) || fstat(dirfd(dir), &s))
+			goto err;
+
+		/* Add trailing slash for next directory. */
+		*bup++ = '/';
+
+		/*
+		 * If it's a mount point, have to stat each element because
+		 * the inode number in the directory is for the entry in the
+		 * parent directory, not the inode number of the mounted file.
+		 */
+		save_errno = 0;
+		if (s.st_dev == dev) {
+			for (;;) {
+				if (!(dp = readdir(dir)))
+					goto notfound;
+				if (dp->d_fileno == ino)
+					break;
+			}
+		} else
+			for (;;) {
+				if (!(dp = readdir(dir)))
+					goto notfound;
+				if (ISDOT(dp))
+					continue;
+				memcpy(bup, dp->d_name, NAMLEN(dp) + 1);
+
+				/* Save the first error for later. */
+				if (lstat(up, &s)) {
+					if (!save_errno)
+						save_errno = errno;
+					errno = 0;
+					continue;
+				}
+				if (s.st_dev == dev && s.st_ino == ino)
+					break;
+			}
+
+		/*
+		 * Check for length of the current name, preceding slash,
+		 * leading slash.
+		 */
+		if (bpt - pt <= NAMLEN(dp) + (first ? 1 : 2)) {
+			size_t len, off;
+			char *npt;
+
+			if (!ptsize) {
+				errno = ERANGE;
+				goto err;
+			}
+			off = bpt - pt;
+			len = ept - bpt;
+			if ((npt = reallocarray(pt, ptsize, 2)) == NULL)
+				goto err;
+			ptsize *= 2;
+			pt = npt;
+			bpt = pt + off;
+			ept = pt + ptsize;
+			memcpy(ept - len, bpt, len);
+			bpt = ept - len;
+		}
+		if (!first)
+			*--bpt = '/';
+		bpt -= NAMLEN(dp);
+		memcpy(bpt, dp->d_name, NAMLEN(dp));
+		(void)closedir(dir);
+
+		/* Truncate any file name. */
+		*bup = '\0';
+	}
+
+notfound:
+	/*
+	 * If readdir set errno, use it, not any saved error; otherwise,
+	 * didn't find the current directory in its parent directory, set
+	 * errno to ENOENT.
+	 */
+	if (!errno)
+		errno = save_errno ? save_errno : ENOENT;
+	/* FALLTHROUGH */
+err:
+	if (ptsize)
+		free(pt);
+	if (up)
+		free(up);
+	if (dir)
+		(void)closedir(dir);
+	return NULL;
+}
+#endif /* HAVE_GETCWD */