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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <resolv.h>
#include "base/sys_byteorder.h"
#include "net/dns/dns_config_service_posix.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
void CompareConfig(const struct __res_state &res, const DnsConfig& config) {
EXPECT_EQ(config.ndots, static_cast<int>(res.ndots));
EXPECT_EQ(config.edns0, (res.options & RES_USE_EDNS0) != 0);
EXPECT_EQ(config.rotate, (res.options & RES_ROTATE) != 0);
EXPECT_EQ(config.timeout.InSeconds(), res.retrans);
EXPECT_EQ(config.attempts, res.retry);
// Compare nameservers. IPv6 precede IPv4.
#if defined(OS_LINUX)
size_t nscount6 = res._u._ext.nscount6;
#else
size_t nscount6 = 0;
#endif
size_t nscount4 = res.nscount;
ASSERT_EQ(config.nameservers.size(), nscount6 + nscount4);
#if defined(OS_LINUX)
for (size_t i = 0; i < nscount6; ++i) {
IPEndPoint ipe;
EXPECT_TRUE(ipe.FromSockAddr(
reinterpret_cast<const struct sockaddr*>(res._u._ext.nsaddrs[i]),
sizeof *res._u._ext.nsaddrs[i]));
EXPECT_EQ(config.nameservers[i], ipe);
}
#endif
for (size_t i = 0; i < nscount4; ++i) {
IPEndPoint ipe;
EXPECT_TRUE(ipe.FromSockAddr(
reinterpret_cast<const struct sockaddr*>(&res.nsaddr_list[i]),
sizeof res.nsaddr_list[i]));
EXPECT_EQ(config.nameservers[nscount6 + i], ipe);
}
ASSERT_TRUE(config.search.size() <= MAXDNSRCH);
EXPECT_TRUE(res.dnsrch[config.search.size()] == NULL);
for (size_t i = 0; i < config.search.size(); ++i) {
EXPECT_EQ(config.search[i], res.dnsrch[i]);
}
}
// Fills in |res| with sane configuration. Change |generation| to add diversity.
void InitializeResState(res_state res, int generation) {
memset(res, 0, sizeof(*res));
res->options = RES_INIT | RES_ROTATE;
res->ndots = 2;
res->retrans = 8;
res->retry = 7;
const char kDnsrch[] = "chromium.org" "\0" "example.com";
memcpy(res->defdname, kDnsrch, sizeof(kDnsrch));
res->dnsrch[0] = res->defdname;
res->dnsrch[1] = res->defdname + sizeof("chromium.org");
const char* ip4addr[3] = {
"8.8.8.8",
"192.168.1.1",
"63.1.2.4",
};
for (int i = 0; i < 3; ++i) {
struct sockaddr_in sa;
sa.sin_family = AF_INET;
sa.sin_port = htons(NS_DEFAULTPORT + i - generation);
inet_pton(AF_INET, ip4addr[i], &sa.sin_addr);
res->nsaddr_list[i] = sa;
}
res->nscount = 3;
#if defined(OS_LINUX)
const char* ip6addr[2] = {
"2001:db8:0::42",
"::FFFF:129.144.52.38",
};
for (int i = 0; i < 2; ++i) {
// Must use malloc to mimick res_ninit.
struct sockaddr_in6 *sa6;
sa6 = (struct sockaddr_in6 *)malloc(sizeof(*sa6));
sa6->sin6_family = AF_INET6;
sa6->sin6_port = htons(NS_DEFAULTPORT - i);
inet_pton(AF_INET6, ip6addr[i], &sa6->sin6_addr);
res->_u._ext.nsaddrs[i] = sa6;
}
res->_u._ext.nscount6 = 2;
#endif
}
void CloseResState(res_state res) {
#if defined(OS_LINUX)
for (int i = 0; i < res->_u._ext.nscount6; ++i) {
ASSERT_TRUE(res->_u._ext.nsaddrs[i] != NULL);
free(res->_u._ext.nsaddrs[i]);
}
#endif
}
} // namespace
TEST(DnsConfigTest, ResolverConfigConvertAndEquals) {
struct __res_state res[2];
DnsConfig config[2];
for (int i = 0; i < 2; ++i) {
EXPECT_FALSE(config[i].IsValid());
InitializeResState(&res[i], i);
ASSERT_TRUE(ConvertResToConfig(res[i], &config[i]));
}
for (int i = 0; i < 2; ++i) {
EXPECT_TRUE(config[i].IsValid());
CompareConfig(res[i], config[i]);
CloseResState(&res[i]);
}
EXPECT_TRUE(config[0].Equals(config[0]));
EXPECT_FALSE(config[0].Equals(config[1]));
EXPECT_FALSE(config[1].Equals(config[0]));
}
} // namespace net
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