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29
30 // safe_readlink_unittest.cc: Unit tests for google_breakpad::SafeReadLink.
31
32 #include "breakpad_googletest_includes.h"
33 #include "common/linux/safe_readlink.h"
34
35 using google_breakpad::SafeReadLink;
36
TEST(SafeReadLinkTest,ZeroBufferSize)37 TEST(SafeReadLinkTest, ZeroBufferSize) {
38 char buffer[1];
39 EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 0));
40 }
41
TEST(SafeReadLinkTest,BufferSizeTooSmall)42 TEST(SafeReadLinkTest, BufferSizeTooSmall) {
43 char buffer[1];
44 EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, 1));
45 }
46
TEST(SafeReadLinkTest,BoundaryBufferSize)47 TEST(SafeReadLinkTest, BoundaryBufferSize) {
48 char buffer[PATH_MAX];
49 EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer, sizeof(buffer)));
50 size_t path_length = strlen(buffer);
51 EXPECT_LT(0U, path_length);
52 EXPECT_GT(sizeof(buffer), path_length);
53
54 // Buffer size equals to the expected path length plus 1 for the NULL byte.
55 char buffer2[PATH_MAX];
56 EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2, path_length + 1));
57 EXPECT_EQ(path_length, strlen(buffer2));
58 EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
59
60 // Buffer size equals to the expected path length.
61 EXPECT_FALSE(SafeReadLink("/proc/self/exe", buffer, path_length));
62 }
63
TEST(SafeReadLinkTest,NonexistentPath)64 TEST(SafeReadLinkTest, NonexistentPath) {
65 char buffer[PATH_MAX];
66 EXPECT_FALSE(SafeReadLink("nonexistent_path", buffer, sizeof(buffer)));
67 }
68
TEST(SafeReadLinkTest,NonSymbolicLinkPath)69 TEST(SafeReadLinkTest, NonSymbolicLinkPath) {
70 char actual_path[PATH_MAX];
71 EXPECT_TRUE(SafeReadLink("/proc/self/exe", actual_path, sizeof(actual_path)));
72
73 char buffer[PATH_MAX];
74 EXPECT_FALSE(SafeReadLink(actual_path, buffer, sizeof(buffer)));
75 }
76
TEST(SafeReadLinkTest,DeduceBufferSizeFromCharArray)77 TEST(SafeReadLinkTest, DeduceBufferSizeFromCharArray) {
78 char buffer[PATH_MAX];
79 char* buffer_pointer = buffer;
80 EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer_pointer, sizeof(buffer)));
81 size_t path_length = strlen(buffer);
82
83 // Use the template version of SafeReadLink to deduce the buffer size
84 // from the char array.
85 char buffer2[PATH_MAX];
86 EXPECT_TRUE(SafeReadLink("/proc/self/exe", buffer2));
87 EXPECT_EQ(path_length, strlen(buffer2));
88 EXPECT_EQ(0, strncmp(buffer, buffer2, PATH_MAX));
89 }
90