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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/test/ares-test-parse-ptr.cc

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#include "ares-test.h"
#include "dns-proto.h"
#include <sstream>
#include <vector>
namespace ares {
namespace test {
TEST_F(LibraryTest, ParsePtrReplyOK) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyCname) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"))
.add_answer(new DNSPtrRR("64.48.32.8.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
struct DNSMalformedCnameRR : public DNSCnameRR {
DNSMalformedCnameRR(const std::string& name, int ttl, const std::string& other)
: DNSCnameRR(name, ttl, other) {}
std::vector<byte> data() const {
std::vector<byte> data = DNSRR::data();
std::vector<byte> encname = EncodeString(other_);
encname[0] = encname[0] + 63; // invalid label length
int len = encname.size();
PushInt16(&data, len);
data.insert(data.end(), encname.begin(), encname.end());
return data;
}
};
TEST_F(LibraryTest, ParsePtrReplyMalformedCname) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSMalformedCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"))
.add_answer(new DNSPtrRR("64.48.32.8.in-addr.arpa", 100, "other.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
ASSERT_EQ(nullptr, host);
}
TEST_F(LibraryTest, ParseManyPtrReply) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other4.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other5.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other6.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other7.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other8.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other9.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
ASSERT_NE(nullptr, host);
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyAdditional) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 55, "other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "ns1.other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "bb.ns2.other.com"))
.add_auth(new DNSNsRR("16.in-addr.arpa", 234, "ns3.other.com"))
.add_additional(new DNSARR("ns1.other.com", 229, {10,20,30,41}))
.add_additional(new DNSARR("bb.ns2.other.com", 229, {10,20,30,42}))
.add_additional(new DNSARR("ns3.other.com", 229, {10,20,30,43}));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
EXPECT_EQ(ARES_SUCCESS, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
ASSERT_NE(nullptr, host);
std::stringstream ss;
ss << HostEnt(host);
EXPECT_EQ("{'other.com' aliases=[other.com] addrs=[16.32.48.64]}", ss.str());
ares_free_hostent(host);
}
TEST_F(LibraryTest, ParsePtrReplyErrors) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
std::vector<byte> data;
struct hostent *host = nullptr;
// No question.
pkt.questions_.clear();
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR));
// Question != answer
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("99.48.32.16.in-addr.arpa", T_PTR));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR));
// Two questions.
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR));
data = pkt.data();
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
pkt.questions_.clear();
pkt.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR));
// Wrong sort of answer.
pkt.answers_.clear();
pkt.add_answer(new DNSMxRR("example.com", 100, 100, "mx1.example.com"));
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
pkt.answers_.clear();
pkt.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
// No answer.
pkt.answers_.clear();
data = pkt.data();
EXPECT_EQ(ARES_ENODATA, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
pkt.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other.com"));
// Truncated packets.
data = pkt.data();
for (size_t len = 1; len < data.size(); len++) {
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), len,
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
}
// Truncated packets with CNAME.
pkt.add_answer(new DNSCnameRR("64.48.32.16.in-addr.arpa", 50, "64.48.32.8.in-addr.arpa"));
data = pkt.data();
for (size_t len = 1; len < data.size(); len++) {
EXPECT_EQ(ARES_EBADRESP, ares_parse_ptr_reply(data.data(), len,
addrv4, sizeof(addrv4), AF_INET, &host));
EXPECT_EQ(nullptr, host);
}
}
TEST_F(LibraryTest, ParsePtrReplyAllocFailSome) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
for (int ii = 1; ii <= 18; ii++) {
ClearFails();
SetAllocFail(ii);
EXPECT_EQ(ARES_ENOMEM, ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host)) << ii;
}
}
TEST_F(LibraryTest, ParsePtrReplyAllocFailMany) {
byte addrv4[4] = {0x10, 0x20, 0x30, 0x40};
DNSPacket pkt;
pkt.set_qid(0x1234).set_response().set_aa()
.add_question(new DNSQuestion("64.48.32.16.in-addr.arpa", T_PTR))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "main.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other1.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other2.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other3.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other4.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other5.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other6.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other7.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other8.com"))
.add_answer(new DNSPtrRR("64.48.32.16.in-addr.arpa", 100, "other9.com"));
std::vector<byte> data = pkt.data();
struct hostent *host = nullptr;
for (int ii = 1; ii <= 63; ii++) {
ClearFails();
SetAllocFail(ii);
int rc = ares_parse_ptr_reply(data.data(), data.size(),
addrv4, sizeof(addrv4), AF_INET, &host);
if (rc != ARES_ENOMEM) {
EXPECT_EQ(ARES_SUCCESS, rc);
ares_free_hostent(host);
host = nullptr;
}
}
}
} // namespace test
} // namespace ares