A C library for asynchronous DNS requests (grpc依赖)
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test: Add initial unit tests for c-ares library The tests are written in C++11, using the GoogleTest and GoogleMock frameworks. They have their own independent autoconf setup, so that users of the library need not have a C++ compiler just to get c-ares working (however, the test/configure.ac file does assume the use of a shared top-level m4/ directory). However, this autoconf setup has only been tested on Linux and OSX so far. Run with "./arestest", or "./arestest -v" to see extra debug info. The GoogleTest options for running specific tests are also available (e.g. "./arestest --gtest_filter=*Live*"). The tests are nowhere near complete yet (currently hitting around 60% coverage as reported by gcov), but they do include examples of a few different styles of testing: - There are live tests (ares-test-live.cc), which assume that the current machine has a valid DNS setup and connection to the internet; these tests issue queries for real domains but don't particularly check what gets returned. The tests will fail on an offline machine. - There a few mock tests (ares-test-mock.cc) that set up a fake DNS server and inject its port into the c-ares library configuration. These tests allow specific response messages to be crafted and injected, and so are likely to be used for many more tests in future. - To make this generation/injection easier, the dns-proto.h file includes C++ helper classes for building DNS packets. - Other library entrypoints that don't require network activity (e.g. ares_parse_*_reply) are tested directly. - There are few tests of library-internal functions that are not normally visible to API users (in ares-test-internal.cc). - A couple of the tests use a helper method of the test fixture to inject memory allocation failures, using the earlier change to the library to allow override of malloc/realloc/free. - There is also an entrypoint to allow Clang's libfuzzer to drive the packet parsing code in ares_parse_*_reply, together with a standalone wrapper for it (./aresfuzz) to allow use of afl-fuzz for further fuzz testing.
9 years ago
// General driver to allow command-line fuzzer (i.e. afl) to
// fuzz the libfuzzer entrypoint.
#include <stdio.h>
#include <unistd.h>
#include <vector>
extern "C" void LLVMFuzzerTestOneInput(const unsigned char *data,
unsigned long size);
int main() {
std::vector<unsigned char> input;
while (true) {
unsigned char buffer[1024];
int len = read(fileno(stdin), buffer, sizeof(buffer));
if (len <= 0) break;
input.insert(input.end(), buffer, buffer + len);
}
LLVMFuzzerTestOneInput(input.data(), input.size());
return 0;
}