1 /*
2 Copyright (c) 2020 Contributors as noted in the AUTHORS file
3
4 This file is part of libzmq, the ZeroMQ core engine in C++.
5
6 libzmq is free software; you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 As a special exception, the Contributors give you permission to link
12 this library with independent modules to produce an executable,
13 regardless of the license terms of these independent modules, and to
14 copy and distribute the resulting executable under terms of your choice,
15 provided that you also meet, for each linked independent module, the
16 terms and conditions of the license of that module. An independent
17 module is a module which is not derived from or based on this library.
18 If you modify this library, you must extend this exception to your
19 version of the library.
20
21 libzmq is distributed in the hope that it will be useful, but WITHOUT
22 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
24 License for more details.
25
26 You should have received a copy of the GNU Lesser General Public License
27 along with this program. If not, see <http://www.gnu.org/licenses/>.
28 */
29
30 #ifdef ZMQ_USE_FUZZING_ENGINE
31 #include <fuzzer/FuzzedDataProvider.h>
32 #endif
33
34 #include "testutil.hpp"
35 #include "testutil_unity.hpp"
36
37 // Test that the ZMTP engine handles invalid handshake when binding
38 // https://rfc.zeromq.org/spec/37/
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)39 extern "C" int LLVMFuzzerTestOneInput (const uint8_t *data, size_t size)
40 {
41 setup_test_context ();
42 char my_endpoint[MAX_SOCKET_STRING];
43 void *server = test_context_socket (ZMQ_STREAM);
44 // As per API by default there's no limit to the size of a message,
45 // but the sanitizer allocator will barf over a gig or so
46 int64_t max_msg_size = 64 * 1024 * 1024;
47 TEST_ASSERT_SUCCESS_ERRNO (
48 zmq_setsockopt (server, ZMQ_MAXMSGSIZE, &max_msg_size, sizeof (int64_t)));
49 bind_loopback_ipv4 (server, my_endpoint, sizeof (my_endpoint));
50 fd_t client = connect_socket (my_endpoint);
51
52 // If there is not enough data for a full greeting, just send what we can
53 // Otherwise send greeting first, as expected by the protocol
54 uint8_t buf[64];
55 if (size >= 64) {
56 send (client, (void *) data, 64, MSG_NOSIGNAL);
57 data += 64;
58 size -= 64;
59 }
60 recv (client, buf, 64, MSG_DONTWAIT);
61 msleep (250);
62 for (ssize_t sent = 0; size > 0 && (sent != -1 || errno == EINTR);
63 size -= sent > 0 ? sent : 0, data += sent > 0 ? sent : 0)
64 sent = send (client, (const char *) data, size, MSG_NOSIGNAL);
65 msleep (250);
66
67 zmq_msg_t msg;
68 zmq_msg_init (&msg);
69 while (-1 != zmq_msg_recv (&msg, server, ZMQ_DONTWAIT)) {
70 zmq_msg_close (&msg);
71 zmq_msg_init (&msg);
72 }
73
74 void *client_good = test_context_socket (ZMQ_DEALER);
75 TEST_ASSERT_SUCCESS_ERRNO (zmq_connect (client_good, my_endpoint));
76
77 TEST_ASSERT_EQUAL_INT (6, zmq_send_const (client_good, "HELLO", 6, 0));
78 zmq_msg_t routing_id;
79 TEST_ASSERT_SUCCESS_ERRNO (zmq_msg_init (&routing_id));
80 TEST_ASSERT_SUCCESS_ERRNO (zmq_msg_recv (&routing_id, server, 0));
81 TEST_ASSERT_TRUE (zmq_msg_more (&routing_id));
82 char const *peer_address = zmq_msg_gets (&routing_id, "Peer-Address");
83 zmq_msg_close (&routing_id);
84 TEST_ASSERT_NOT_NULL (peer_address);
85 TEST_ASSERT_EQUAL_STRING ("127.0.0.1", peer_address);
86 TEST_ASSERT_EQUAL_INT (
87 0, TEST_ASSERT_SUCCESS_ERRNO (zmq_recv (server, buf, 64, 0)));
88 zmq_msg_init (&msg);
89 while (-1 != zmq_msg_recv (&msg, server, ZMQ_DONTWAIT)) {
90 zmq_msg_close (&msg);
91 zmq_msg_init (&msg);
92 }
93
94 close (client);
95 test_context_socket_close_zero_linger (client_good);
96 test_context_socket_close_zero_linger (server);
97 teardown_test_context ();
98
99 return 0;
100 }
101
102 #ifndef ZMQ_USE_FUZZING_ENGINE
test_bind_stream_fuzzer()103 void test_bind_stream_fuzzer ()
104 {
105 uint8_t **data;
106 size_t *len, num_cases = 0;
107 if (fuzzer_corpus_encode (
108 "tests/libzmq-fuzz-corpora/test_bind_stream_fuzzer_seed_corpus",
109 &data, &len, &num_cases)
110 != 0)
111 exit (77);
112
113 while (num_cases-- > 0) {
114 TEST_ASSERT_SUCCESS_ERRNO (
115 LLVMFuzzerTestOneInput (data[num_cases], len[num_cases]));
116 free (data[num_cases]);
117 }
118
119 free (data);
120 free (len);
121 }
122
main(int argc,char ** argv)123 int main (int argc, char **argv)
124 {
125 setup_test_environment ();
126
127 UNITY_BEGIN ();
128 RUN_TEST (test_bind_stream_fuzzer);
129
130 return UNITY_END ();
131 }
132 #endif
133