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-rw-r--r--src/c-ares/test/ares-test.cc677
1 files changed, 677 insertions, 0 deletions
diff --git a/src/c-ares/test/ares-test.cc b/src/c-ares/test/ares-test.cc
new file mode 100644
index 000000000..f08d3db56
--- /dev/null
+++ b/src/c-ares/test/ares-test.cc
@@ -0,0 +1,677 @@
+#include "ares-test.h"
+#include "dns-proto.h"
+
+// Include ares internal files for DNS protocol details
+#include "nameser.h"
+#include "ares_dns.h"
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+#ifdef HAVE_NETINET_TCP_H
+#include <netinet/tcp.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <functional>
+#include <sstream>
+
+#ifdef WIN32
+#define BYTE_CAST (char *)
+#define sclose(x) closesocket(x)
+#define mkdir_(d, p) mkdir(d)
+#else
+#define BYTE_CAST
+#define sclose(x) close(x)
+#define mkdir_(d, p) mkdir(d, p)
+#endif
+
+namespace ares {
+namespace test {
+
+bool verbose = false;
+int mock_port = 5300;
+
+unsigned long long LibraryTest::fails_ = 0;
+std::map<size_t, int> LibraryTest::size_fails_;
+
+void ProcessWork(ares_channel channel,
+ std::function<std::set<int>()> get_extrafds,
+ std::function<void(int)> process_extra) {
+ int nfds, count;
+ fd_set readers, writers;
+ struct timeval tv;
+ while (true) {
+ // Retrieve the set of file descriptors that the library wants us to monitor.
+ FD_ZERO(&readers);
+ FD_ZERO(&writers);
+ nfds = ares_fds(channel, &readers, &writers);
+ if (nfds == 0) // no work left to do in the library
+ return;
+
+ // Add in the extra FDs if present.
+ std::set<int> extrafds = get_extrafds();
+ for (int extrafd : extrafds) {
+ FD_SET(extrafd, &readers);
+ if (extrafd >= nfds) {
+ nfds = extrafd + 1;
+ }
+ }
+
+ // Wait for activity or timeout.
+ tv.tv_sec = 0;
+ tv.tv_usec = 100000; // 100ms
+ count = select(nfds, &readers, &writers, nullptr, &tv);
+ if (count < 0) {
+ fprintf(stderr, "select() failed, errno %d\n", errno);
+ return;
+ }
+
+ // Let the library process any activity.
+ ares_process(channel, &readers, &writers);
+
+ // Let the provided callback process any activity on the extra FD.
+ for (int extrafd : extrafds) {
+ if (FD_ISSET(extrafd, &readers)) {
+ process_extra(extrafd);
+ }
+ }
+ }
+}
+
+// static
+void LibraryTest::SetAllocFail(int nth) {
+ assert(nth > 0);
+ assert(nth <= (int)(8 * sizeof(fails_)));
+ fails_ |= (1LL << (nth - 1));
+}
+
+// static
+void LibraryTest::SetAllocSizeFail(size_t size) {
+ size_fails_[size]++;
+}
+
+// static
+void LibraryTest::ClearFails() {
+ fails_ = 0;
+ size_fails_.clear();
+}
+
+
+// static
+bool LibraryTest::ShouldAllocFail(size_t size) {
+ bool fail = (fails_ & 0x01);
+ fails_ >>= 1;
+ if (size_fails_[size] > 0) {
+ size_fails_[size]--;
+ fail = true;
+ }
+ return fail;
+}
+
+// static
+void* LibraryTest::amalloc(size_t size) {
+ if (ShouldAllocFail(size)) {
+ if (verbose) std::cerr << "Failing malloc(" << size << ") request" << std::endl;
+ return nullptr;
+ } else {
+ return malloc(size);
+ }
+}
+
+// static
+void* LibraryTest::arealloc(void *ptr, size_t size) {
+ if (ShouldAllocFail(size)) {
+ if (verbose) std::cerr << "Failing realloc(" << ptr << ", " << size << ") request" << std::endl;
+ return nullptr;
+ } else {
+ return realloc(ptr, size);
+ }
+}
+
+// static
+void LibraryTest::afree(void *ptr) {
+ free(ptr);
+}
+
+std::set<int> NoExtraFDs() {
+ return std::set<int>();
+}
+
+void DefaultChannelTest::Process() {
+ ProcessWork(channel_, NoExtraFDs, nullptr);
+}
+
+void DefaultChannelModeTest::Process() {
+ ProcessWork(channel_, NoExtraFDs, nullptr);
+}
+
+MockServer::MockServer(int family, int port, int tcpport)
+ : udpport_(port), tcpport_(tcpport ? tcpport : udpport_), qid_(-1) {
+ // Create a TCP socket to receive data on.
+ tcpfd_ = socket(family, SOCK_STREAM, 0);
+ EXPECT_NE(-1, tcpfd_);
+ int optval = 1;
+ setsockopt(tcpfd_, SOL_SOCKET, SO_REUSEADDR,
+ BYTE_CAST &optval , sizeof(int));
+ // Send TCP data right away.
+ setsockopt(tcpfd_, IPPROTO_TCP, TCP_NODELAY,
+ BYTE_CAST &optval , sizeof(int));
+
+ // Create a UDP socket to receive data on.
+ udpfd_ = socket(family, SOCK_DGRAM, 0);
+ EXPECT_NE(-1, udpfd_);
+
+ // Bind the sockets to the given port.
+ if (family == AF_INET) {
+ struct sockaddr_in addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl(INADDR_ANY);
+ addr.sin_port = htons(tcpport_);
+ int tcprc = bind(tcpfd_, (struct sockaddr*)&addr, sizeof(addr));
+ EXPECT_EQ(0, tcprc) << "Failed to bind AF_INET to TCP port " << tcpport_;
+ addr.sin_port = htons(udpport_);
+ int udprc = bind(udpfd_, (struct sockaddr*)&addr, sizeof(addr));
+ EXPECT_EQ(0, udprc) << "Failed to bind AF_INET to UDP port " << udpport_;
+ } else {
+ EXPECT_EQ(AF_INET6, family);
+ struct sockaddr_in6 addr;
+ memset(&addr, 0, sizeof(addr));
+ addr.sin6_family = AF_INET6;
+ memset(&addr.sin6_addr, 0, sizeof(addr.sin6_addr)); // in6addr_any
+ addr.sin6_port = htons(tcpport_);
+ int tcprc = bind(tcpfd_, (struct sockaddr*)&addr, sizeof(addr));
+ EXPECT_EQ(0, tcprc) << "Failed to bind AF_INET6 to TCP port " << tcpport_;
+ addr.sin6_port = htons(udpport_);
+ int udprc = bind(udpfd_, (struct sockaddr*)&addr, sizeof(addr));
+ EXPECT_EQ(0, udprc) << "Failed to bind AF_INET6 to UDP port " << udpport_;
+ }
+ if (verbose) std::cerr << "Configured "
+ << (family == AF_INET ? "IPv4" : "IPv6")
+ << " mock server with TCP socket " << tcpfd_
+ << " on port " << tcpport_
+ << " and UDP socket " << udpfd_
+ << " on port " << udpport_ << std::endl;
+
+ // For TCP, also need to listen for connections.
+ EXPECT_EQ(0, listen(tcpfd_, 5)) << "Failed to listen for TCP connections";
+}
+
+MockServer::~MockServer() {
+ for (int fd : connfds_) {
+ sclose(fd);
+ }
+ sclose(tcpfd_);
+ sclose(udpfd_);
+}
+
+void MockServer::ProcessFD(int fd) {
+ if (fd != tcpfd_ && fd != udpfd_ && connfds_.find(fd) == connfds_.end()) {
+ // Not one of our FDs.
+ return;
+ }
+ if (fd == tcpfd_) {
+ int connfd = accept(tcpfd_, NULL, NULL);
+ if (connfd < 0) {
+ std::cerr << "Error accepting connection on fd " << fd << std::endl;
+ } else {
+ connfds_.insert(connfd);
+ }
+ return;
+ }
+
+ // Activity on a data-bearing file descriptor.
+ struct sockaddr_storage addr;
+ socklen_t addrlen = sizeof(addr);
+ byte buffer[2048];
+ int len = recvfrom(fd, BYTE_CAST buffer, sizeof(buffer), 0,
+ (struct sockaddr *)&addr, &addrlen);
+ byte* data = buffer;
+ if (fd != udpfd_) {
+ if (len == 0) {
+ connfds_.erase(std::find(connfds_.begin(), connfds_.end(), fd));
+ sclose(fd);
+ return;
+ }
+ if (len < 2) {
+ std::cerr << "Packet too short (" << len << ")" << std::endl;
+ return;
+ }
+ int tcplen = (data[0] << 8) + data[1];
+ data += 2;
+ len -= 2;
+ if (tcplen != len) {
+ std::cerr << "Warning: TCP length " << tcplen
+ << " doesn't match remaining data length " << len << std::endl;
+ }
+ }
+
+ // Assume the packet is a well-formed DNS request and extract the request
+ // details.
+ if (len < NS_HFIXEDSZ) {
+ std::cerr << "Packet too short (" << len << ")" << std::endl;
+ return;
+ }
+ int qid = DNS_HEADER_QID(data);
+ if (DNS_HEADER_QR(data) != 0) {
+ std::cerr << "Not a request" << std::endl;
+ return;
+ }
+ if (DNS_HEADER_OPCODE(data) != ns_o_query) {
+ std::cerr << "Not a query (opcode " << DNS_HEADER_OPCODE(data)
+ << ")" << std::endl;
+ return;
+ }
+ if (DNS_HEADER_QDCOUNT(data) != 1) {
+ std::cerr << "Unexpected question count (" << DNS_HEADER_QDCOUNT(data)
+ << ")" << std::endl;
+ return;
+ }
+ byte* question = data + 12;
+ int qlen = len - 12;
+
+ char *name = nullptr;
+ long enclen;
+ ares_expand_name(question, data, len, &name, &enclen);
+ if (!name) {
+ std::cerr << "Failed to retrieve name" << std::endl;
+ return;
+ }
+ qlen -= enclen;
+ question += enclen;
+ std::string namestr(name);
+ free(name);
+
+ if (qlen < 4) {
+ std::cerr << "Unexpected question size (" << qlen
+ << " bytes after name)" << std::endl;
+ return;
+ }
+ if (DNS_QUESTION_CLASS(question) != ns_c_in) {
+ std::cerr << "Unexpected question class (" << DNS_QUESTION_CLASS(question)
+ << ")" << std::endl;
+ return;
+ }
+ int rrtype = DNS_QUESTION_TYPE(question);
+
+ if (verbose) {
+ std::vector<byte> req(data, data + len);
+ std::cerr << "received " << (fd == udpfd_ ? "UDP" : "TCP") << " request " << PacketToString(req)
+ << " on port " << (fd == udpfd_ ? udpport_ : tcpport_) << std::endl;
+ std::cerr << "ProcessRequest(" << qid << ", '" << namestr
+ << "', " << RRTypeToString(rrtype) << ")" << std::endl;
+ }
+ ProcessRequest(fd, &addr, addrlen, qid, namestr, rrtype);
+}
+
+std::set<int> MockServer::fds() const {
+ std::set<int> result = connfds_;
+ result.insert(tcpfd_);
+ result.insert(udpfd_);
+ return result;
+}
+
+void MockServer::ProcessRequest(int fd, struct sockaddr_storage* addr, int addrlen,
+ int qid, const std::string& name, int rrtype) {
+ // Before processing, let gMock know the request is happening.
+ OnRequest(name, rrtype);
+
+ if (reply_.size() == 0) {
+ return;
+ }
+
+ // Make a local copy of the current pending reply.
+ std::vector<byte> reply = reply_;
+
+ if (qid_ >= 0) {
+ // Use the explicitly specified query ID.
+ qid = qid_;
+ }
+ if (reply.size() >= 2) {
+ // Overwrite the query ID if space to do so.
+ reply[0] = (byte)((qid >> 8) & 0xff);
+ reply[1] = (byte)(qid & 0xff);
+ }
+ if (verbose) std::cerr << "sending reply " << PacketToString(reply)
+ << " on port " << ((fd == udpfd_) ? udpport_ : tcpport_) << std::endl;
+
+ // Prefix with 2-byte length if TCP.
+ if (fd != udpfd_) {
+ int len = reply.size();
+ std::vector<byte> vlen = {(byte)((len & 0xFF00) >> 8), (byte)(len & 0xFF)};
+ reply.insert(reply.begin(), vlen.begin(), vlen.end());
+ // Also, don't bother with the destination address.
+ addr = nullptr;
+ addrlen = 0;
+ }
+
+ int rc = sendto(fd, BYTE_CAST reply.data(), reply.size(), 0,
+ (struct sockaddr *)addr, addrlen);
+ if (rc < static_cast<int>(reply.size())) {
+ std::cerr << "Failed to send full reply, rc=" << rc << std::endl;
+ }
+}
+
+// static
+MockChannelOptsTest::NiceMockServers MockChannelOptsTest::BuildServers(int count, int family, int base_port) {
+ NiceMockServers servers;
+ assert(count > 0);
+ for (int ii = 0; ii < count; ii++) {
+ std::unique_ptr<NiceMockServer> server(new NiceMockServer(family, base_port + ii));
+ servers.push_back(std::move(server));
+ }
+ return servers;
+}
+
+MockChannelOptsTest::MockChannelOptsTest(int count,
+ int family,
+ bool force_tcp,
+ struct ares_options* givenopts,
+ int optmask)
+ : servers_(BuildServers(count, family, mock_port)),
+ server_(*servers_[0].get()), channel_(nullptr) {
+ // Set up channel options.
+ struct ares_options opts;
+ if (givenopts) {
+ memcpy(&opts, givenopts, sizeof(opts));
+ } else {
+ memset(&opts, 0, sizeof(opts));
+ }
+
+ // Point the library at the first mock server by default (overridden below).
+ opts.udp_port = mock_port;
+ optmask |= ARES_OPT_UDP_PORT;
+ opts.tcp_port = mock_port;
+ optmask |= ARES_OPT_TCP_PORT;
+
+ // If not already overridden, set short-ish timeouts.
+ if (!(optmask & (ARES_OPT_TIMEOUTMS|ARES_OPT_TIMEOUT))) {
+ opts.timeout = 1500;
+ optmask |= ARES_OPT_TIMEOUTMS;
+ }
+ // If not already overridden, set 3 retries.
+ if (!(optmask & ARES_OPT_TRIES)) {
+ opts.tries = 3;
+ optmask |= ARES_OPT_TRIES;
+ }
+ // If not already overridden, set search domains.
+ const char *domains[3] = {"first.com", "second.org", "third.gov"};
+ if (!(optmask & ARES_OPT_DOMAINS)) {
+ opts.ndomains = 3;
+ opts.domains = (char**)domains;
+ optmask |= ARES_OPT_DOMAINS;
+ }
+ if (force_tcp) {
+ opts.flags |= ARES_FLAG_USEVC;
+ optmask |= ARES_OPT_FLAGS;
+ }
+
+ EXPECT_EQ(ARES_SUCCESS, ares_init_options(&channel_, &opts, optmask));
+ EXPECT_NE(nullptr, channel_);
+
+ // Set up servers after construction so we can set individual ports
+ struct ares_addr_port_node* prev = nullptr;
+ struct ares_addr_port_node* first = nullptr;
+ for (const auto& server : servers_) {
+ struct ares_addr_port_node* node = (struct ares_addr_port_node*)malloc(sizeof(*node));
+ if (prev) {
+ prev->next = node;
+ } else {
+ first = node;
+ }
+ node->next = nullptr;
+ node->family = family;
+ node->udp_port = server->udpport();
+ node->tcp_port = server->tcpport();
+ if (family == AF_INET) {
+ node->addr.addr4.s_addr = htonl(0x7F000001);
+ } else {
+ memset(&node->addr.addr6, 0, sizeof(node->addr.addr6));
+ node->addr.addr6._S6_un._S6_u8[15] = 1;
+ }
+ prev = node;
+ }
+ EXPECT_EQ(ARES_SUCCESS, ares_set_servers_ports(channel_, first));
+
+ while (first) {
+ prev = first;
+ first = first->next;
+ free(prev);
+ }
+ if (verbose) {
+ std::cerr << "Configured library with servers:";
+ std::vector<std::string> servers = GetNameServers(channel_);
+ for (const auto& server : servers) {
+ std::cerr << " " << server;
+ }
+ std::cerr << std::endl;
+ }
+}
+
+MockChannelOptsTest::~MockChannelOptsTest() {
+ if (channel_) {
+ ares_destroy(channel_);
+ }
+ channel_ = nullptr;
+}
+
+std::set<int> MockChannelOptsTest::fds() const {
+ std::set<int> fds;
+ for (const auto& server : servers_) {
+ std::set<int> serverfds = server->fds();
+ fds.insert(serverfds.begin(), serverfds.end());
+ }
+ return fds;
+}
+
+void MockChannelOptsTest::ProcessFD(int fd) {
+ for (auto& server : servers_) {
+ server->ProcessFD(fd);
+ }
+}
+
+void MockChannelOptsTest::Process() {
+ using namespace std::placeholders;
+ ProcessWork(channel_,
+ std::bind(&MockChannelOptsTest::fds, this),
+ std::bind(&MockChannelOptsTest::ProcessFD, this, _1));
+}
+
+std::ostream& operator<<(std::ostream& os, const HostResult& result) {
+ os << '{';
+ if (result.done_) {
+ os << StatusToString(result.status_) << " " << result.host_;
+ } else {
+ os << "(incomplete)";
+ }
+ os << '}';
+ return os;
+}
+
+HostEnt::HostEnt(const struct hostent *hostent) : addrtype_(-1) {
+ if (!hostent)
+ return;
+ if (hostent->h_name)
+ name_ = hostent->h_name;
+ if (hostent->h_aliases) {
+ char** palias = hostent->h_aliases;
+ while (*palias != nullptr) {
+ aliases_.push_back(*palias);
+ palias++;
+ }
+ }
+ addrtype_ = hostent->h_addrtype;
+ if (hostent->h_addr_list) {
+ char** paddr = hostent->h_addr_list;
+ while (*paddr != nullptr) {
+ std::string addr = AddressToString(*paddr, hostent->h_length);
+ addrs_.push_back(addr);
+ paddr++;
+ }
+ }
+}
+
+std::ostream& operator<<(std::ostream& os, const HostEnt& host) {
+ os << '{';
+ os << "'" << host.name_ << "' "
+ << "aliases=[";
+ for (size_t ii = 0; ii < host.aliases_.size(); ii++) {
+ if (ii > 0) os << ", ";
+ os << host.aliases_[ii];
+ }
+ os << "] ";
+ os << "addrs=[";
+ for (size_t ii = 0; ii < host.addrs_.size(); ii++) {
+ if (ii > 0) os << ", ";
+ os << host.addrs_[ii];
+ }
+ os << "]";
+ os << '}';
+ return os;
+}
+
+void HostCallback(void *data, int status, int timeouts,
+ struct hostent *hostent) {
+ EXPECT_NE(nullptr, data);
+ HostResult* result = reinterpret_cast<HostResult*>(data);
+ result->done_ = true;
+ result->status_ = status;
+ result->timeouts_ = timeouts;
+ result->host_ = HostEnt(hostent);
+ if (verbose) std::cerr << "HostCallback(" << *result << ")" << std::endl;
+}
+
+std::ostream& operator<<(std::ostream& os, const SearchResult& result) {
+ os << '{';
+ if (result.done_) {
+ os << StatusToString(result.status_) << " " << PacketToString(result.data_);
+ } else {
+ os << "(incomplete)";
+ }
+ os << '}';
+ return os;
+}
+
+void SearchCallback(void *data, int status, int timeouts,
+ unsigned char *abuf, int alen) {
+ EXPECT_NE(nullptr, data);
+ SearchResult* result = reinterpret_cast<SearchResult*>(data);
+ result->done_ = true;
+ result->status_ = status;
+ result->timeouts_ = timeouts;
+ result->data_.assign(abuf, abuf + alen);
+ if (verbose) std::cerr << "SearchCallback(" << *result << ")" << std::endl;
+}
+
+std::ostream& operator<<(std::ostream& os, const NameInfoResult& result) {
+ os << '{';
+ if (result.done_) {
+ os << StatusToString(result.status_) << " " << result.node_ << " " << result.service_;
+ } else {
+ os << "(incomplete)";
+ }
+ os << '}';
+ return os;
+}
+
+void NameInfoCallback(void *data, int status, int timeouts,
+ char *node, char *service) {
+ EXPECT_NE(nullptr, data);
+ NameInfoResult* result = reinterpret_cast<NameInfoResult*>(data);
+ result->done_ = true;
+ result->status_ = status;
+ result->timeouts_ = timeouts;
+ result->node_ = std::string(node ? node : "");
+ result->service_ = std::string(service ? service : "");
+ if (verbose) std::cerr << "NameInfoCallback(" << *result << ")" << std::endl;
+}
+
+std::vector<std::string> GetNameServers(ares_channel channel) {
+ struct ares_addr_port_node* servers = nullptr;
+ EXPECT_EQ(ARES_SUCCESS, ares_get_servers_ports(channel, &servers));
+ struct ares_addr_port_node* server = servers;
+ std::vector<std::string> results;
+ while (server) {
+ std::stringstream ss;
+ switch (server->family) {
+ case AF_INET:
+ ss << AddressToString((char*)&server->addr.addr4, 4);
+ break;
+ case AF_INET6:
+ if (server->udp_port != 0) {
+ ss << '[';
+ }
+ ss << AddressToString((char*)&server->addr.addr6, 16);
+ if (server->udp_port != 0) {
+ ss << ']';
+ }
+ break;
+ default:
+ results.push_back("<unknown family>");
+ break;
+ }
+ if (server->udp_port != 0) {
+ ss << ":" << server->udp_port;
+ }
+ results.push_back(ss.str());
+ server = server->next;
+ }
+ if (servers) ares_free_data(servers);
+ return results;
+}
+
+TransientDir::TransientDir(const std::string& dirname) : dirname_(dirname) {
+ if (mkdir_(dirname_.c_str(), 0755) != 0) {
+ std::cerr << "Failed to create subdirectory '" << dirname_ << "'" << std::endl;
+ }
+}
+
+TransientDir::~TransientDir() {
+ rmdir(dirname_.c_str());
+}
+
+TransientFile::TransientFile(const std::string& filename,
+ const std::string& contents)
+ : filename_(filename) {
+ FILE *f = fopen(filename.c_str(), "w");
+ if (f == nullptr) {
+ std::cerr << "Error: failed to create '" << filename << "'" << std::endl;
+ return;
+ }
+ int rc = fwrite(contents.data(), 1, contents.size(), f);
+ if (rc != (int)contents.size()) {
+ std::cerr << "Error: failed to write contents of '" << filename << "'" << std::endl;
+ }
+ fclose(f);
+}
+
+TransientFile::~TransientFile() {
+ unlink(filename_.c_str());
+}
+
+std::string TempNam(const char *dir, const char *prefix) {
+ char *p = tempnam(dir, prefix);
+ std::string result(p);
+ free(p);
+ return result;
+}
+
+TempFile::TempFile(const std::string& contents)
+ : TransientFile(TempNam(nullptr, "ares"), contents) {
+
+}
+
+VirtualizeIO::VirtualizeIO(ares_channel c)
+ : channel_(c)
+{
+ ares_set_socket_functions(channel_, &default_functions, 0);
+}
+
+VirtualizeIO::~VirtualizeIO() {
+ ares_set_socket_functions(channel_, 0, 0);
+}
+
+} // namespace test
+} // namespace ares
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