From 55ae0eaea8684aa78089bbd0c2116e0c8cb25585 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <dvlasenk@redhat.com>
Date: Tue, 1 Feb 2011 16:04:30 +0100
Subject: abrt-cli -r DIR: copy non-writable DIR into $HOME/abrt/spool

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
---
 src/lib/copy_file_recursive.c | 139 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 src/lib/copy_file_recursive.c

(limited to 'src/lib/copy_file_recursive.c')

diff --git a/src/lib/copy_file_recursive.c b/src/lib/copy_file_recursive.c
new file mode 100644
index 00000000..c3f021c7
--- /dev/null
+++ b/src/lib/copy_file_recursive.c
@@ -0,0 +1,139 @@
+/*
+    Copyright (C) 2011  ABRT team
+    Copyright (C) 2011  RedHat Inc
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "abrtlib.h"
+
+int copy_file_recursive(const char *source, const char *dest)
+{
+	/* This is a recursive function, try to minimize stack usage */
+	/* NB: each struct stat is ~100 bytes */
+	struct stat source_stat;
+	struct stat dest_stat;
+	int retval = 0;
+	int dest_exists = 0;
+
+	if (strcmp(source, ".lock") == 0)
+		goto skip;
+
+	if (stat(source, &source_stat) < 0) {
+		perror_msg("Can't stat '%s'", source);
+		return -1;
+	}
+
+	if (lstat(dest, &dest_stat) < 0) {
+		if (errno != ENOENT) {
+			perror_msg("Can't stat '%s'", dest);
+			return -1;
+		}
+	} else {
+		if (source_stat.st_dev == dest_stat.st_dev
+		 && source_stat.st_ino == dest_stat.st_ino
+		) {
+			error_msg("'%s' and '%s' are the same file", source, dest);
+			return -1;
+		}
+		dest_exists = 1;
+	}
+
+	if (S_ISDIR(source_stat.st_mode)) {
+		DIR *dp;
+		struct dirent *d;
+
+		if (dest_exists) {
+			if (!S_ISDIR(dest_stat.st_mode)) {
+				error_msg("Target '%s' is not a directory", dest);
+				return -1;
+			}
+			/* race here: user can substitute a symlink between
+			 * this check and actual creation of files inside dest */
+		} else {
+			/* Create DEST */
+			mode_t mode = source_stat.st_mode;
+			/* Allow owner to access new dir (at least for now) */
+			mode |= S_IRWXU;
+			if (mkdir(dest, mode) < 0) {
+				perror_msg("Can't create directory '%s'", dest);
+				return -1;
+			}
+		}
+		/* Recursively copy files in SOURCE */
+		dp = opendir(source);
+		if (dp == NULL) {
+			retval = -1;
+			goto ret;
+		}
+
+		while (retval == 0 && (d = readdir(dp)) != NULL) {
+			char *new_source, *new_dest;
+
+			if (dot_or_dotdot(d->d_name))
+				continue;
+			new_source = concat_path_file(source, d->d_name);
+			new_dest = concat_path_file(dest, d->d_name);
+			if (copy_file_recursive(new_source, new_dest) < 0)
+				retval = -1;
+			free(new_source);
+			free(new_dest);
+		}
+		closedir(dp);
+
+		goto ret;
+	}
+
+	if (S_ISREG(source_stat.st_mode)) {
+		int src_fd;
+		int dst_fd;
+		mode_t new_mode;
+
+		src_fd = open(source, O_RDONLY);
+		if (src_fd < 0) {
+			perror_msg("Can't open '%s'", source);
+			return -1;
+		}
+
+		/* Do not try to open with weird mode fields */
+		new_mode = source_stat.st_mode;
+
+		// security problem versus (sym)link attacks
+		// dst_fd = open(dest, O_WRONLY|O_CREAT|O_TRUNC, new_mode);
+		/* safe way: */
+		dst_fd = open(dest, O_WRONLY|O_CREAT|O_EXCL, new_mode);
+		if (dst_fd < 0) {
+			close(src_fd);
+			return -1;
+		}
+
+		if (copyfd_eof(src_fd, dst_fd, COPYFD_SPARSE) == -1)
+			retval = -1;
+		close(src_fd);
+		/* Careful: do check that buffered writes succeeded... */
+		if (close(dst_fd) < 0) {
+			perror_msg("Error writing to '%s'", dest);
+			retval = -1;
+		}
+		goto ret;
+	}
+
+	/* Neither dir not regular file: skip */
+
+ skip:
+	log("Skipping '%s'", source);
+ ret:
+	return retval;
+}
-- 
cgit