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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/sockaddr_util_posix.h"
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "net/base/sockaddr_storage.h"
#include "testing/gmock/include/gmock/gmock-matchers.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net {
namespace {
size_t MaxPathLength(SockaddrStorage* storage) {
// |storage.addr_len| is initialized to the largest possible platform-
// dependent value. Subtracting the size of the initial fields in
// sockaddr_un gives us the longest permissible path value including space
// for an extra NUL character at the front or back.
return storage->addr_len - offsetof(struct sockaddr_un, sun_path) - 1;
}
} // namespace
TEST(FillUnixAddressTest, SimpleAddress) {
SockaddrStorage storage;
std::string path = "/tmp/socket/path";
EXPECT_TRUE(
FillUnixAddress(path, /*use_abstract_namespace=*/false, &storage));
// |storage.addr_len| indicates the full size of the data in sockaddr_un.
// The size is increased by one byte to include the string NUL terminator.
EXPECT_EQ(path.size() + 1U + offsetof(struct sockaddr_un, sun_path),
(unsigned int)storage.addr_len);
struct sockaddr_un* socket_addr =
reinterpret_cast<struct sockaddr_un*>(storage.addr);
EXPECT_EQ(socket_addr->sun_family, AF_UNIX);
// Implicit conversion to std::string for comparison is fine since the path
// is always NUL terminated.
EXPECT_EQ(socket_addr->sun_path, path);
}
TEST(FillUnixAddressTest, PathEmpty) {
SockaddrStorage storage;
std::string path = "";
EXPECT_FALSE(
FillUnixAddress(path, /*use_abstract_namespace=*/false, &storage));
}
TEST(FillUnixAddressTest, AddressMaxLength) {
SockaddrStorage storage;
size_t path_max = MaxPathLength(&storage);
std::string path(path_max, '0');
EXPECT_TRUE(
FillUnixAddress(path, /*use_abstract_namespace=*/false, &storage));
struct sockaddr_un* socket_addr =
reinterpret_cast<struct sockaddr_un*>(storage.addr);
EXPECT_EQ(socket_addr->sun_family, AF_UNIX);
EXPECT_EQ(socket_addr->sun_path, path);
}
TEST(FillUnixAddressTest, AddressTooLong) {
SockaddrStorage storage;
size_t path_max = MaxPathLength(&storage);
std::string path(path_max + 1, '0');
EXPECT_FALSE(
FillUnixAddress(path, /*use_abstract_namespace=*/false, &storage));
}
TEST(FillUnixAddressTest, AbstractLinuxAddress) {
SockaddrStorage storage;
size_t path_max = MaxPathLength(&storage);
std::string path(path_max, '0');
#if BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
EXPECT_TRUE(FillUnixAddress(path, /*use_abstract_namespace=*/true, &storage));
EXPECT_EQ(path.size() + 1U + offsetof(struct sockaddr_un, sun_path),
(unsigned int)storage.addr_len);
struct sockaddr_un* socket_addr =
reinterpret_cast<struct sockaddr_un*>(storage.addr);
EXPECT_EQ(socket_addr->sun_family, AF_UNIX);
// The path buffer is preceded by a NUL character for abstract Linux
// addresses.
EXPECT_EQ(socket_addr->sun_path[0], '\0');
// The path string may not be NUL terminated, so do a buffer copy when
// converting to std::string.
std::string unix_path(reinterpret_cast<char*>(socket_addr->sun_path + 1),
path.size());
EXPECT_EQ(unix_path, path);
#else
// Other platforms don't support the abstract Linux namespace.
EXPECT_FALSE(
FillUnixAddress(path, /*use_abstract_namespace=*/true, &storage));
#endif
}
} // namespace net
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