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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <errno.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "test/util/test_util.h"
namespace gvisor {
namespace testing {
// MatchesStringLength checks that a tuple argument of (struct iovec *, int)
// corresponding to an iovec array and its length, contains data that matches
// the string length strlen.
MATCHER_P(MatchesStringLength, strlen, "") {
struct iovec* iovs = arg.first;
int niov = arg.second;
int offset = 0;
for (int i = 0; i < niov; i++) {
offset += iovs[i].iov_len;
}
if (offset != static_cast<int>(strlen)) {
*result_listener << offset;
return false;
}
return true;
}
// MatchesStringValue checks that a tuple argument of (struct iovec *, int)
// corresponding to an iovec array and its length, contains data that matches
// the string value str.
MATCHER_P(MatchesStringValue, str, "") {
struct iovec* iovs = arg.first;
int len = strlen(str);
int niov = arg.second;
int offset = 0;
for (int i = 0; i < niov; i++) {
struct iovec iov = iovs[i];
if (len < offset) {
*result_listener << "strlen " << len << " < offset " << offset;
return false;
}
if (strncmp(static_cast<char*>(iov.iov_base), &str[offset], iov.iov_len)) {
absl::string_view iovec_string(static_cast<char*>(iov.iov_base),
iov.iov_len);
*result_listener << iovec_string << " @offset " << offset;
return false;
}
offset += iov.iov_len;
}
return true;
}
extern const char kReadvTestData[] =
"127.0.0.1 localhost"
""
"# The following lines are desirable for IPv6 capable hosts"
"::1 ip6-localhost ip6-loopback"
"fe00::0 ip6-localnet"
"ff00::0 ip6-mcastprefix"
"ff02::1 ip6-allnodes"
"ff02::2 ip6-allrouters"
"ff02::3 ip6-allhosts"
"192.168.1.100 a"
"93.184.216.34 foo.bar.example.com xcpu";
extern const size_t kReadvTestDataSize = sizeof(kReadvTestData);
static void ReadAllOneProvidedBuffer(int fd, std::vector<char>* buffer) {
struct iovec iovs[1];
iovs[0].iov_base = buffer->data();
iovs[0].iov_len = kReadvTestDataSize;
ASSERT_THAT(readv(fd, iovs, 1), SyscallSucceedsWithValue(kReadvTestDataSize));
std::pair<struct iovec*, int> iovec_desc(iovs, 1);
EXPECT_THAT(iovec_desc, MatchesStringLength(kReadvTestDataSize));
EXPECT_THAT(iovec_desc, MatchesStringValue(kReadvTestData));
}
void ReadAllOneBuffer(int fd) {
std::vector<char> buffer(kReadvTestDataSize);
ReadAllOneProvidedBuffer(fd, &buffer);
}
void ReadAllOneLargeBuffer(int fd) {
std::vector<char> buffer(10 * kReadvTestDataSize);
ReadAllOneProvidedBuffer(fd, &buffer);
}
void ReadOneHalfAtATime(int fd) {
int len0 = kReadvTestDataSize / 2;
int len1 = kReadvTestDataSize - len0;
std::vector<char> buffer0(len0);
std::vector<char> buffer1(len1);
struct iovec iovs[2];
iovs[0].iov_base = buffer0.data();
iovs[0].iov_len = len0;
iovs[1].iov_base = buffer1.data();
iovs[1].iov_len = len1;
ASSERT_THAT(readv(fd, iovs, 2), SyscallSucceedsWithValue(kReadvTestDataSize));
std::pair<struct iovec*, int> iovec_desc(iovs, 2);
EXPECT_THAT(iovec_desc, MatchesStringLength(kReadvTestDataSize));
EXPECT_THAT(iovec_desc, MatchesStringValue(kReadvTestData));
}
void ReadOneBufferPerByte(int fd) {
std::vector<char> buffer(kReadvTestDataSize);
std::vector<struct iovec> iovs(kReadvTestDataSize);
char* buffer_ptr = buffer.data();
struct iovec* iovs_ptr = iovs.data();
for (int i = 0; i < static_cast<int>(kReadvTestDataSize); i++) {
struct iovec iov = {
.iov_base = &buffer_ptr[i],
.iov_len = 1,
};
iovs_ptr[i] = iov;
}
ASSERT_THAT(readv(fd, iovs_ptr, kReadvTestDataSize),
SyscallSucceedsWithValue(kReadvTestDataSize));
std::pair<struct iovec*, int> iovec_desc(iovs.data(), kReadvTestDataSize);
EXPECT_THAT(iovec_desc, MatchesStringLength(kReadvTestDataSize));
EXPECT_THAT(iovec_desc, MatchesStringValue(kReadvTestData));
}
void ReadBuffersOverlapping(int fd) {
// overlap the first overlap_bytes.
int overlap_bytes = 8;
std::vector<char> buffer(kReadvTestDataSize);
// overlapping causes us to get more data.
int expected_size = kReadvTestDataSize + overlap_bytes;
std::vector<char> expected(expected_size);
char* expected_ptr = expected.data();
memcpy(expected_ptr, &kReadvTestData[overlap_bytes], overlap_bytes);
memcpy(&expected_ptr[overlap_bytes], &kReadvTestData[overlap_bytes],
kReadvTestDataSize - overlap_bytes);
struct iovec iovs[2];
iovs[0].iov_base = buffer.data();
iovs[0].iov_len = overlap_bytes;
iovs[1].iov_base = buffer.data();
iovs[1].iov_len = kReadvTestDataSize;
ASSERT_THAT(readv(fd, iovs, 2), SyscallSucceedsWithValue(kReadvTestDataSize));
std::pair<struct iovec*, int> iovec_desc(iovs, 2);
EXPECT_THAT(iovec_desc, MatchesStringLength(expected_size));
EXPECT_THAT(iovec_desc, MatchesStringValue(expected_ptr));
}
void ReadBuffersDiscontinuous(int fd) {
// Each iov is 1 byte separated by 1 byte.
std::vector<char> buffer(kReadvTestDataSize * 2);
std::vector<struct iovec> iovs(kReadvTestDataSize);
char* buffer_ptr = buffer.data();
struct iovec* iovs_ptr = iovs.data();
for (int i = 0; i < static_cast<int>(kReadvTestDataSize); i++) {
struct iovec iov = {
.iov_base = &buffer_ptr[i * 2],
.iov_len = 1,
};
iovs_ptr[i] = iov;
}
ASSERT_THAT(readv(fd, iovs_ptr, kReadvTestDataSize),
SyscallSucceedsWithValue(kReadvTestDataSize));
std::pair<struct iovec*, int> iovec_desc(iovs.data(), kReadvTestDataSize);
EXPECT_THAT(iovec_desc, MatchesStringLength(kReadvTestDataSize));
EXPECT_THAT(iovec_desc, MatchesStringValue(kReadvTestData));
}
void ReadIovecsCompletelyFilled(int fd) {
int half = kReadvTestDataSize / 2;
std::vector<char> buffer(kReadvTestDataSize);
char* buffer_ptr = buffer.data();
memset(buffer.data(), '\0', kReadvTestDataSize);
struct iovec iovs[2];
iovs[0].iov_base = buffer.data();
iovs[0].iov_len = half;
iovs[1].iov_base = &buffer_ptr[half];
iovs[1].iov_len = half;
ASSERT_THAT(readv(fd, iovs, 2), SyscallSucceedsWithValue(half * 2));
std::pair<struct iovec*, int> iovec_desc(iovs, 2);
EXPECT_THAT(iovec_desc, MatchesStringLength(half * 2));
EXPECT_THAT(iovec_desc, MatchesStringValue(kReadvTestData));
char* str = static_cast<char*>(iovs[0].iov_base);
str[iovs[0].iov_len - 1] = '\0';
ASSERT_EQ(half - 1, strlen(str));
}
} // namespace testing
} // namespace gvisor
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