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android13/system/logging/logd/logd_test.cpp

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/*
* Copyright (C) 2014 The Android Open Source Project
*
* 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 <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <string>
#include <android-base/file.h>
#include <android-base/macros.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <cutils/sockets.h>
#include <gtest/gtest-death-test.h>
#include <gtest/gtest.h>
#include <log/log_read.h>
#include <private/android_filesystem_config.h>
#include <private/android_logger.h>
#ifdef __ANDROID__
#include <selinux/selinux.h>
#endif
#include "LogUtils.h" // For LOGD_SNDTIMEO.
using android::base::unique_fd;
#ifdef __ANDROID__
static bool write_command(int sock, const char* command) {
// The command sent to logd must include the '\0' character at the end.
size_t command_length = strlen(command) + 1;
ssize_t bytes_written = TEMP_FAILURE_RETRY(write(sock, command, command_length));
if (bytes_written != static_cast<ssize_t>(command_length)) {
if (bytes_written == -1) {
printf("Failed to send '%s' command: %s\n", command, strerror(errno));
} else {
printf("Failed to send '%s' command: bytes written %zd, expected written %zu\n",
command, bytes_written, command_length);
}
return false;
}
return true;
}
static bool write_command(int sock, const std::string& command) {
return write_command(sock, command.c_str());
}
static void send_to_control(const char* command, std::string& result) {
unique_fd sock(socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM));
ASSERT_LT(0, sock) << "Failed to open logd: " << strerror(errno);
ASSERT_TRUE(write_command(sock, command));
result.clear();
while (true) {
struct pollfd p = {.fd = sock, .events = POLLIN, .revents = 0};
// Timeout after 20 seconds.
int ret = TEMP_FAILURE_RETRY(poll(&p, 1, 20000));
ASSERT_TRUE(ret != -1) << "Poll call failed for command '" << command
<< "': " << strerror(errno);
ASSERT_NE(0, ret) << "Timeout sending command '" << command << "'";
ASSERT_TRUE(p.revents & POLLIN)
<< "Command socket not readable for command '" << command << "'";
char buffer[256];
ssize_t bytes_read = TEMP_FAILURE_RETRY(read(sock, buffer, sizeof(buffer)));
ASSERT_GE(bytes_read, 0) << "Read failed for command '" << command
<< "': " << strerror(errno);
result += std::string(buffer, bytes_read);
if (bytes_read == 0 || static_cast<size_t>(bytes_read) < sizeof(buffer)) {
return;
}
}
}
#endif
#ifdef LOGD_ENABLE_FLAKY_TESTS
TEST(logd, statistics) {
#ifdef __ANDROID__
// Drop cache so that any access problems can be discovered.
if (!android::base::WriteStringToFile("3\n", "/proc/sys/vm/drop_caches")) {
GTEST_LOG_(INFO) << "Could not open trigger dropping inode cache";
}
std::string result;
send_to_control("getStatistics 0 1 2 3 4", result);
ASSERT_FALSE(result.empty());
EXPECT_NE(std::string::npos, result.find("\nChattiest UIDs in main "));
EXPECT_NE(std::string::npos, result.find("\nChattiest UIDs in radio "));
EXPECT_NE(std::string::npos, result.find("\nChattiest UIDs in system "));
EXPECT_NE(std::string::npos, result.find("\nChattiest UIDs in events "));
// Look for any u0_a or u0_a[0-9]+ values. If found, it indicates the
// libpackagelistparser failed.
static const char getpwuid_prefix[] = " u0_a";
size_t pos = 0;
while ((pos = result.find(getpwuid_prefix, pos)) != std::string::npos) {
// Check to see if the value following u0_a is all digits, or empty.
size_t uid_name_pos = pos + strlen(getpwuid_prefix);
size_t i = 0;
while (isdigit(result[uid_name_pos + i])) {
i++;
}
ASSERT_FALSE(isspace(result[uid_name_pos + i]))
<< "libpackagelistparser failed to pick up " << result.substr(uid_name_pos, i);
pos = uid_name_pos + i;
}
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
#endif
#ifdef __ANDROID__
static void caught_signal(int /* signum */) {
}
static void dump_log_msg(const char* prefix, log_msg* msg, int lid) {
std::cout << std::flush;
std::cerr << std::flush;
fflush(stdout);
fflush(stderr);
EXPECT_GE(msg->entry.hdr_size, sizeof(logger_entry));
fprintf(stderr, "%s: [%u] ", prefix, msg->len());
fprintf(stderr, "hdr_size=%u ", msg->entry.hdr_size);
fprintf(stderr, "pid=%u tid=%u %u.%09u ", msg->entry.pid, msg->entry.tid, msg->entry.sec,
msg->entry.nsec);
lid = msg->entry.lid;
switch (lid) {
case 0:
fprintf(stderr, "lid=main ");
break;
case 1:
fprintf(stderr, "lid=radio ");
break;
case 2:
fprintf(stderr, "lid=events ");
break;
case 3:
fprintf(stderr, "lid=system ");
break;
case 4:
fprintf(stderr, "lid=crash ");
break;
case 5:
fprintf(stderr, "lid=security ");
break;
case 6:
fprintf(stderr, "lid=kernel ");
break;
default:
if (lid >= 0) {
fprintf(stderr, "lid=%d ", lid);
}
}
unsigned int len = msg->entry.len;
fprintf(stderr, "msg[%u]={", len);
unsigned char* cp = reinterpret_cast<unsigned char*>(msg->msg());
if (!cp) {
static const unsigned char garbage[] = "<INVALID>";
cp = const_cast<unsigned char*>(garbage);
len = strlen(reinterpret_cast<const char*>(garbage));
}
while (len) {
unsigned char* p = cp;
while (*p && (((' ' <= *p) && (*p < 0x7F)) || (*p == '\n'))) {
++p;
}
if (((p - cp) > 3) && !*p && ((unsigned int)(p - cp) < len)) {
fprintf(stderr, "\"");
while (*cp) {
if (*cp != '\n') {
fprintf(stderr, "%c", *cp);
} else {
fprintf(stderr, "\\n");
}
++cp;
--len;
}
fprintf(stderr, "\"");
} else {
fprintf(stderr, "%02x", *cp);
}
++cp;
if (--len) {
fprintf(stderr, ", ");
}
}
fprintf(stderr, "}\n");
fflush(stderr);
}
#endif
// b/26447386 confirm fixed
void timeout_negative(const char* command) {
#ifdef __ANDROID__
log_msg msg_wrap, msg_timeout;
bool content_wrap = false, content_timeout = false, written = false;
unsigned int alarm_wrap = 0, alarm_timeout = 0;
// A few tries to get it right just in case wrap kicks in due to
// content providers being active during the test.
int i = 3;
while (--i) {
unique_fd fd(
socket_local_client("logdr", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET));
ASSERT_LT(0, fd) << "Failed to open logdr: " << strerror(errno);
struct sigaction ignore = {.sa_handler = caught_signal};
sigemptyset(&ignore.sa_mask);
struct sigaction old_sigaction;
sigaction(SIGALRM, &ignore, &old_sigaction);
unsigned int old_alarm = alarm(3);
written = write_command(fd, command);
if (!written) {
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, nullptr);
continue;
}
// alarm triggers at 50% of the --wrap time out
content_wrap = TEMP_FAILURE_RETRY(recv(fd, msg_wrap.buf, sizeof(msg_wrap), 0)) > 0;
alarm_wrap = alarm(5);
// alarm triggers at 133% of the --wrap time out
content_timeout = TEMP_FAILURE_RETRY(recv(fd, msg_timeout.buf, sizeof(msg_timeout), 0)) > 0;
if (!content_timeout) { // make sure we hit dumpAndClose
content_timeout =
TEMP_FAILURE_RETRY(recv(fd, msg_timeout.buf, sizeof(msg_timeout), 0)) > 0;
}
if (old_alarm > 0) {
unsigned int time_spent = 3 - alarm_wrap;
if (old_alarm > time_spent + 1) {
old_alarm -= time_spent;
} else {
old_alarm = 2;
}
}
alarm_timeout = alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, nullptr);
if (content_wrap && alarm_wrap && content_timeout && alarm_timeout) {
break;
}
}
if (content_wrap) {
dump_log_msg("wrap", &msg_wrap, -1);
}
if (content_timeout) {
dump_log_msg("timeout", &msg_timeout, -1);
}
EXPECT_TRUE(written);
EXPECT_TRUE(content_wrap);
EXPECT_NE(0U, alarm_wrap);
EXPECT_TRUE(content_timeout);
EXPECT_NE(0U, alarm_timeout);
#else
command = nullptr;
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
TEST(logd, timeout_no_start) {
timeout_negative("dumpAndClose lids=0,1,2,3,4,5 timeout=6");
}
TEST(logd, timeout_start_epoch) {
timeout_negative(
"dumpAndClose lids=0,1,2,3,4,5 timeout=6 start=0.000000000");
}
#ifdef LOGD_ENABLE_FLAKY_TESTS
// b/26447386 refined behavior
TEST(logd, timeout) {
#ifdef __ANDROID__
// b/33962045 This test interferes with other log reader tests that
// follow because of file descriptor socket persistence in the same
// process. So let's fork it to isolate it from giving us pain.
pid_t pid = fork();
if (pid) {
siginfo_t info = {};
ASSERT_EQ(0, TEMP_FAILURE_RETRY(waitid(P_PID, pid, &info, WEXITED)));
ASSERT_EQ(0, info.si_status);
return;
}
log_msg msg_wrap, msg_timeout;
bool content_wrap = false, content_timeout = false, written = false;
unsigned int alarm_wrap = 0, alarm_timeout = 0;
// A few tries to get it right just in case wrap kicks in due to
// content providers being active during the test.
int i = 5;
log_time start(CLOCK_REALTIME);
start.tv_sec -= 30; // reach back a moderate period of time
while (--i) {
unique_fd fd(
socket_local_client("logdr", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET));
ASSERT_LT(0, fd) << "Failed to open logdr: " << strerror(errno);
std::string ask = android::base::StringPrintf(
"dumpAndClose lids=0,1,2,3,4,5 timeout=6 start=%" PRIu32
".%09" PRIu32,
start.tv_sec, start.tv_nsec);
struct sigaction ignore = {.sa_handler = caught_signal};
sigemptyset(&ignore.sa_mask);
struct sigaction old_sigaction;
sigaction(SIGALRM, &ignore, &old_sigaction);
unsigned int old_alarm = alarm(3);
written = write_command(fd, ask);
if (!written) {
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, nullptr);
continue;
}
// alarm triggers at 50% of the --wrap time out
content_wrap = TEMP_FAILURE_RETRY(recv(fd, msg_wrap.buf, sizeof(msg_wrap), 0)) > 0;
alarm_wrap = alarm(5);
// alarm triggers at 133% of the --wrap time out
content_timeout = TEMP_FAILURE_RETRY(recv(fd, msg_timeout.buf, sizeof(msg_timeout), 0)) > 0;
if (!content_timeout) { // make sure we hit dumpAndClose
content_timeout =
TEMP_FAILURE_RETRY(recv(fd, msg_timeout.buf, sizeof(msg_timeout), 0)) > 0;
}
if (old_alarm > 0) {
unsigned int time_spent = 3 - alarm_wrap;
if (old_alarm > time_spent + 1) {
old_alarm -= time_spent;
} else {
old_alarm = 2;
}
}
alarm_timeout = alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, nullptr);
if (!content_wrap && !alarm_wrap && content_timeout && alarm_timeout) {
break;
}
// modify start time in case content providers are relatively
// active _or_ inactive during the test.
if (content_timeout) {
log_time msg(msg_timeout.entry.sec, msg_timeout.entry.nsec);
if (msg < start) {
fprintf(stderr, "%u.%09u < %u.%09u\n", msg_timeout.entry.sec,
msg_timeout.entry.nsec, (unsigned)start.tv_sec,
(unsigned)start.tv_nsec);
_exit(-1);
}
if (msg > start) {
start = msg;
start.tv_sec += 30;
log_time now = log_time(CLOCK_REALTIME);
if (start > now) {
start = now;
--start.tv_sec;
}
}
} else {
start.tv_sec -= 120; // inactive, reach further back!
}
}
if (content_wrap) {
dump_log_msg("wrap", &msg_wrap, -1);
}
if (content_timeout) {
dump_log_msg("timeout", &msg_timeout, -1);
}
if (content_wrap || !content_timeout) {
fprintf(stderr, "start=%" PRIu32 ".%09" PRIu32 "\n", start.tv_sec,
start.tv_nsec);
}
EXPECT_TRUE(written);
EXPECT_FALSE(content_wrap);
EXPECT_EQ(0U, alarm_wrap);
EXPECT_TRUE(content_timeout);
EXPECT_NE(0U, alarm_timeout);
_exit(!written + content_wrap + alarm_wrap + !content_timeout +
!alarm_timeout);
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
#endif
#ifdef LOGD_ENABLE_FLAKY_TESTS
// b/27242723 confirmed fixed
TEST(logd, SNDTIMEO) {
#ifdef __ANDROID__
static const unsigned sndtimeo =
LOGD_SNDTIMEO; // <sigh> it has to be done!
static const unsigned sleep_time = sndtimeo + 3;
static const unsigned alarm_time = sleep_time + 5;
unique_fd fd(socket_local_client("logdr", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_SEQPACKET));
ASSERT_LT(0, fd) << "Failed to open logdr: " << strerror(errno);
struct sigaction ignore = {.sa_handler = caught_signal};
sigemptyset(&ignore.sa_mask);
struct sigaction old_sigaction;
sigaction(SIGALRM, &ignore, &old_sigaction);
unsigned int old_alarm = alarm(alarm_time);
// Stream all sources.
ASSERT_TRUE(write_command(fd, "stream lids=0,1,2,3,4,5,6"));
log_msg msg;
bool read_one = TEMP_FAILURE_RETRY(recv(fd, msg.buf, sizeof(msg), 0)) > 0;
EXPECT_TRUE(read_one);
if (read_one) {
dump_log_msg("user", &msg, -1);
}
fprintf(stderr, "Sleep for >%d seconds logd SO_SNDTIMEO ...\n", sndtimeo);
sleep(sleep_time);
// flush will block if we did not trigger. if it did, last entry returns 0
int recv_ret;
do {
recv_ret = TEMP_FAILURE_RETRY(recv(fd, msg.buf, sizeof(msg), 0));
} while (recv_ret > 0);
int save_errno = (recv_ret < 0) ? errno : 0;
EXPECT_NE(0U, alarm(old_alarm));
sigaction(SIGALRM, &old_sigaction, nullptr);
EXPECT_EQ(0, recv_ret);
if (recv_ret > 0) {
dump_log_msg("user", &msg, -1);
}
EXPECT_EQ(0, save_errno);
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
#endif
TEST(logd, getEventTag_list) {
#ifdef __ANDROID__
std::string result;
send_to_control("getEventTag name=*", result);
ASSERT_FALSE(result.empty());
char* cp;
long ret = strtol(result.c_str(), &cp, 10);
EXPECT_GT(ret, 4096) << "Command result: " << result;
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
TEST(logd, getEventTag_42) {
#ifdef __ANDROID__
std::string result;
send_to_control("getEventTag id=42", result);
ASSERT_FALSE(result.empty());
char* cp;
long ret = strtol(result.c_str(), &cp, 10);
EXPECT_GT(ret, 16) << "Command result: " << result;
EXPECT_NE(std::string::npos, result.find("\t(to life the universe etc|3)"))
<< "Command result: " << result;
EXPECT_NE(std::string::npos, result.find("answer")) << "Command result: " << result;
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
TEST(logd, getEventTag_newentry) {
#ifdef __ANDROID__
log_time now(CLOCK_MONOTONIC);
std::string name;
name = android::base::StringPrintf("a%" PRIu64, now.nsec());
std::string command;
command = android::base::StringPrintf("getEventTag name=%s format=\"(new|1)\"", name.c_str());
std::string result;
send_to_control(command.c_str(), result);
ASSERT_FALSE(result.empty());
char* cp;
long ret = strtol(result.c_str(), &cp, 10);
EXPECT_GT(ret, 16) << "Command result: " << result;
EXPECT_NE(std::string::npos, result.find("\t(new|1)")) << "Command result: " << result;
EXPECT_NE(std::string::npos, result.find(name)) << "Command result: " << result;
// ToDo: also look for this in /data/misc/logd/event-log-tags and
// /dev/event-log-tags.
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
TEST(logd, no_epipe) {
#ifdef __ANDROID__
// Actually generating SIGPIPE in logd is racy, since we need to close the socket quicker than
// logd finishes writing the data to it, so we try 5 times, which should be enough to trigger
// SIGPIPE if logd isn't ignoring SIGPIPE
for (int i = 0; i < 5; ++i) {
unique_fd sock1(
socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM));
ASSERT_LT(0, sock1) << "Failed to open logd: " << strerror(errno);
unique_fd sock2(
socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_RESERVED, SOCK_STREAM));
ASSERT_LT(0, sock2) << "Failed to open logd: " << strerror(errno);
std::string message = "getStatistics 0 1 2 3 4 5 6 7";
ASSERT_TRUE(write_command(sock1, message));
sock1.reset();
ASSERT_TRUE(write_command(sock2, message));
struct pollfd p = {.fd = sock2, .events = POLLIN, .revents = 0};
int ret = TEMP_FAILURE_RETRY(poll(&p, 1, 1000));
EXPECT_EQ(ret, 1);
EXPECT_TRUE(p.revents & POLLIN);
EXPECT_FALSE(p.revents & POLL_ERR);
}
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
// Only AID_ROOT, AID_SYSTEM, and AID_LOG can set log sizes. Ensure that a different user, AID_BIN,
// cannot set the log size.
TEST(logd, logging_permissions) {
#ifdef __ANDROID__
if (getuid() != 0) {
GTEST_SKIP() << "This test requires root";
}
auto child_main = [] {
setgroups(0, nullptr);
setgid(AID_BIN);
setuid(AID_BIN);
std::unique_ptr<logger_list, decltype(&android_logger_list_free)> logger_list{
android_logger_list_alloc(0, 0, 0), &android_logger_list_free};
if (!logger_list) {
_exit(1);
}
auto logger = android_logger_open(logger_list.get(), LOG_ID_MAIN);
if (!logger) {
_exit(2);
}
// This line should fail, so if it returns 0, we exit with an error.
if (android_logger_set_log_size(logger, 2 * 1024 * 1024) == 0) {
_exit(3);
}
_exit(EXIT_SUCCESS);
};
ASSERT_EXIT(child_main(), testing::ExitedWithCode(0), "");
#else
GTEST_LOG_(INFO) << "This test does nothing.\n";
#endif
}
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