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fusefs: handle evil servers that return illegal inode numbers
[FreeBSD/FreeBSD.git] / tests / sys / fs / fusefs / readlink.cc
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2019 The FreeBSD Foundation
5  *
6  * This software was developed by BFF Storage Systems, LLC under sponsorship
7  * from the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  * $FreeBSD$
31  */
32
33 extern "C" {
34 #include <sys/param.h>
35
36 #include <unistd.h>
37 }
38
39 #include "mockfs.hh"
40 #include "utils.hh"
41
42 using namespace testing;
43
44 class Readlink: public FuseTest {
45 public:
46 void expect_lookup(const char *relpath, uint64_t ino)
47 {
48         FuseTest::expect_lookup(relpath, ino, S_IFLNK | 0777, 0, 1);
49 }
50 void expect_readlink(uint64_t ino, ProcessMockerT r)
51 {
52         EXPECT_CALL(*m_mock, process(
53                 ResultOf([=](auto in) {
54                         return (in.header.opcode == FUSE_READLINK &&
55                                 in.header.nodeid == ino);
56                 }, Eq(true)),
57                 _)
58         ).WillOnce(Invoke(r));
59 }
60
61 };
62
63 class PushSymlinksIn: public Readlink {
64         virtual void SetUp() {
65                 m_push_symlinks_in = true;
66                 Readlink::SetUp();
67         }
68 };
69
70 TEST_F(Readlink, eloop)
71 {
72         const char FULLPATH[] = "mountpoint/src";
73         const char RELPATH[] = "src";
74         const uint64_t ino = 42;
75         char buf[80];
76
77         expect_lookup(RELPATH, ino);
78         expect_readlink(ino, ReturnErrno(ELOOP));
79
80         EXPECT_EQ(-1, readlink(FULLPATH, buf, sizeof(buf)));
81         EXPECT_EQ(ELOOP, errno);
82 }
83
84 TEST_F(Readlink, ok)
85 {
86         const char FULLPATH[] = "mountpoint/src";
87         const char RELPATH[] = "src";
88         const char dst[] = "dst";
89         const uint64_t ino = 42;
90         char buf[80];
91
92         expect_lookup(RELPATH, ino);
93         expect_readlink(ino, ReturnImmediate([=](auto in __unused, auto& out) {
94                 strlcpy(out.body.str, dst, sizeof(out.body.str));
95                 out.header.len = sizeof(out.header) + strlen(dst) + 1;
96         }));
97
98         EXPECT_EQ(static_cast<ssize_t>(strlen(dst)) + 1,
99                   readlink(FULLPATH, buf, sizeof(buf)));
100         EXPECT_STREQ(dst, buf);
101 }
102
103 TEST_F(PushSymlinksIn, readlink)
104 {
105         const char FULLPATH[] = "mountpoint/src";
106         const char RELPATH[] = "src";
107         const char dst[] = "/dst";
108         const uint64_t ino = 42;
109         char buf[MAXPATHLEN], wd[MAXPATHLEN], want[MAXPATHLEN];
110         int len;
111
112         expect_lookup(RELPATH, ino);
113         expect_readlink(ino, ReturnImmediate([=](auto in __unused, auto& out) {
114                 strlcpy(out.body.str, dst, sizeof(out.body.str));
115                 out.header.len = sizeof(out.header) + strlen(dst) + 1;
116         }));
117
118         ASSERT_NE(nullptr, getcwd(wd, sizeof(wd))) << strerror(errno);
119         len = snprintf(want, sizeof(want), "%s/mountpoint%s", wd, dst);
120         ASSERT_LE(0, len) << strerror(errno);
121
122         EXPECT_EQ(static_cast<ssize_t>(len) + 1,
123                 readlink(FULLPATH, buf, sizeof(buf)));
124         EXPECT_STREQ(want, buf);
125 }