michael@0: // Copyright (c) 2011, Google Inc.
michael@0: // All rights reserved.
michael@0: //
michael@0: // Redistribution and use in source and binary forms, with or without
michael@0: // modification, are permitted provided that the following conditions are
michael@0: // met:
michael@0: //
michael@0: //     * Redistributions of source code must retain the above copyright
michael@0: // notice, this list of conditions and the following disclaimer.
michael@0: //     * Redistributions in binary form must reproduce the above
michael@0: // copyright notice, this list of conditions and the following disclaimer
michael@0: // in the documentation and/or other materials provided with the
michael@0: // distribution.
michael@0: //     * Neither the name of Google Inc. nor the names of its
michael@0: // contributors may be used to endorse or promote products derived from
michael@0: // this software without specific prior written permission.
michael@0: //
michael@0: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0: // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0: // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0: // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
michael@0: // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
michael@0: // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
michael@0: // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
michael@0: // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
michael@0: // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
michael@0: // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
michael@0: // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: 
michael@0: // safe_readlink_unittest.cc: Unit tests for google_breakpad::SafeReadLink.
michael@0: 
michael@0: #include "breakpad_googletest_includes.h"
michael@0: #include "common/linux/safe_readlink.h"
michael@0: 
michael@0: using google_breakpad::SafeReadLink;
michael@0: 
michael@0: TEST(SafeReadLinkTest, ZeroBufferSize) {
michael@0:   char buffer[1];
michael@0:   EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 0));
michael@0: }
michael@0: 
michael@0: TEST(SafeReadLinkTest, BufferSizeTooSmall) {
michael@0:   char buffer[1];
michael@0:   EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 1));
michael@0: }
michael@0: 
michael@0: TEST(SafeReadLinkTest, BoundaryBufferSize) {
michael@0:   char buffer[PATH_MAX];
michael@0:   EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer, sizeof(buffer)));
michael@0:   size_t path_length = strlen(buffer);
michael@0:   EXPECT_LT(0U, path_length);
michael@0:   EXPECT_GT(sizeof(buffer), path_length);
michael@0: 
michael@0:   // Buffer size equals to the expected path length plus 1 for the NULL byte.
michael@0:   char buffer2[PATH_MAX];
michael@0:   EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2, path_length + 1));
michael@0:   EXPECT_EQ(path_length, strlen(buffer2));
michael@0:   EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
michael@0: 
michael@0:   // Buffer size equals to the expected path length.
michael@0:   EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, path_length));
michael@0: }
michael@0: 
michael@0: TEST(SafeReadLinkTest, NonexistentPath) {
michael@0:   char buffer[PATH_MAX];
michael@0:   EXPECT_FALSE(SafeReadLink("nonexistent_path", buffer, sizeof(buffer)));
michael@0: }
michael@0: 
michael@0: TEST(SafeReadLinkTest, NonSymbolicLinkPath) {
michael@0:   char actual_path[PATH_MAX];
michael@0:   EXPECT_TRUE(SafeReadLink("/proc/self/exe", actual_path, sizeof(actual_path)));
michael@0: 
michael@0:   char buffer[PATH_MAX];
michael@0:   EXPECT_FALSE(SafeReadLink(actual_path, buffer, sizeof(buffer)));
michael@0: }
michael@0: 
michael@0: TEST(SafeReadLinkTest, DeduceBufferSizeFromCharArray) {
michael@0:   char buffer[PATH_MAX];
michael@0:   char* buffer_pointer = buffer;
michael@0:   EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer_pointer, sizeof(buffer)));
michael@0:   size_t path_length = strlen(buffer);
michael@0: 
michael@0:   // Use the template version of SafeReadLink to deduce the buffer size
michael@0:   // from the char array.
michael@0:   char buffer2[PATH_MAX];
michael@0:   EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2));
michael@0:   EXPECT_EQ(path_length, strlen(buffer2));
michael@0:   EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
michael@0: }