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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2025 Asynchronous B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Asynchronous B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <Shared/Fundamentals/Initialization.h>
#include <Shared/Fundamentals/AbortHandler.h>
#include <Shared/Fundamentals/Utils.h>
#include <oxt/initialize.hpp>
#include <oxt/backtrace.hpp>
#include <string>
#include <vector>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <Exceptions.h>
#include <ResourceLocator.h>
#include <LoggingKit/LoggingKit.h>
#include <LoggingKit/Context.h>
#include <StrIntTools/StrIntUtils.h>
#include <IOTools/MessageIO.h>
#include <SystemTools/SystemTime.h>
namespace Passenger {
namespace Agent {
namespace Fundamentals {
using namespace std;
Context *context = NULL;
bool
feedbackFdAvailable() {
return context->feedbackFdAvailable;
}
static int
lookupErrno(const char *name) {
struct Entry {
int errorCode;
const char * const name;
};
static const Entry entries[] = {
{ EPERM, "EPERM" },
{ ENOENT, "ENOENT" },
{ ESRCH, "ESRCH" },
{ EINTR, "EINTR" },
{ EBADF, "EBADF" },
{ ENOMEM, "ENOMEM" },
{ EACCES, "EACCES" },
{ EBUSY, "EBUSY" },
{ EEXIST, "EEXIST" },
{ ENOTDIR, "ENOTDIR" },
{ EISDIR, "EISDIR" },
{ EINVAL, "EINVAL" },
{ ENFILE, "ENFILE" },
{ EMFILE, "EMFILE" },
{ ENOTTY, "ENOTTY" },
{ ETXTBSY, "ETXTBSY" },
{ ENOSPC, "ENOSPC" },
{ ESPIPE, "ESPIPE" },
{ EMLINK, "EMLINK" },
{ EPIPE, "EPIPE" },
{ EAGAIN, "EAGAIN" },
{ EWOULDBLOCK, "EWOULDBLOCK" },
{ EINPROGRESS, "EINPROGRESS" },
{ EADDRINUSE, "EADDRINUSE" },
{ EADDRNOTAVAIL, "EADDRNOTAVAIL" },
{ ENETUNREACH, "ENETUNREACH" },
{ ECONNABORTED, "ECONNABORTED" },
{ ECONNRESET, "ECONNRESET" },
{ EISCONN, "EISCONN" },
{ ENOTCONN, "ENOTCONN" },
{ ETIMEDOUT, "ETIMEDOUT" },
{ ECONNREFUSED, "ECONNREFUSED" },
{ EHOSTDOWN, "EHOSTDOWN" },
{ EHOSTUNREACH, "EHOSTUNREACH" },
#ifdef EIO
{ EIO, "EIO" },
#endif
#ifdef ENXIO
{ ENXIO, "ENXIO" },
#endif
#ifdef E2BIG
{ E2BIG, "E2BIG" },
#endif
#ifdef ENOEXEC
{ ENOEXEC, "ENOEXEC" },
#endif
#ifdef ECHILD
{ ECHILD, "ECHILD" },
#endif
#ifdef EDEADLK
{ EDEADLK, "EDEADLK" },
#endif
#ifdef EFAULT
{ EFAULT, "EFAULT" },
#endif
#ifdef ENOTBLK
{ ENOTBLK, "ENOTBLK" },
#endif
#ifdef EXDEV
{ EXDEV, "EXDEV" },
#endif
#ifdef ENODEV
{ ENODEV, "ENODEV" },
#endif
#ifdef EFBIG
{ EFBIG, "EFBIG" },
#endif
#ifdef EROFS
{ EROFS, "EROFS" },
#endif
#ifdef EDOM
{ EDOM, "EDOM" },
#endif
#ifdef ERANGE
{ ERANGE, "ERANGE" },
#endif
#ifdef EALREADY
{ EALREADY, "EALREADY" },
#endif
#ifdef ENOTSOCK
{ ENOTSOCK, "ENOTSOCK" },
#endif
#ifdef EDESTADDRREQ
{ EDESTADDRREQ, "EDESTADDRREQ" },
#endif
#ifdef EMSGSIZE
{ EMSGSIZE, "EMSGSIZE" },
#endif
#ifdef EPROTOTYPE
{ EPROTOTYPE, "EPROTOTYPE" },
#endif
#ifdef ENOPROTOOPT
{ ENOPROTOOPT, "ENOPROTOOPT" },
#endif
#ifdef EPROTONOSUPPORT
{ EPROTONOSUPPORT, "EPROTONOSUPPORT" },
#endif
#ifdef ESOCKTNOSUPPORT
{ ESOCKTNOSUPPORT, "ESOCKTNOSUPPORT" },
#endif
#ifdef ENOTSUP
{ ENOTSUP, "ENOTSUP" },
#endif
#ifdef EOPNOTSUPP
{ EOPNOTSUPP, "EOPNOTSUPP" },
#endif
#ifdef EPFNOSUPPORT
{ EPFNOSUPPORT, "EPFNOSUPPORT" },
#endif
#ifdef EAFNOSUPPORT
{ EAFNOSUPPORT, "EAFNOSUPPORT" },
#endif
#ifdef ENETDOWN
{ ENETDOWN, "ENETDOWN" },
#endif
#ifdef ENETRESET
{ ENETRESET, "ENETRESET" },
#endif
#ifdef ENOBUFS
{ ENOBUFS, "ENOBUFS" },
#endif
#ifdef ESHUTDOWN
{ ESHUTDOWN, "ESHUTDOWN" },
#endif
#ifdef ETOOMANYREFS
{ ETOOMANYREFS, "ETOOMANYREFS" },
#endif
#ifdef ELOOP
{ ELOOP, "ELOOP" },
#endif
#ifdef ENAMETOOLONG
{ ENAMETOOLONG, "ENAMETOOLONG" },
#endif
#ifdef ENOTEMPTY
{ ENOTEMPTY, "ENOTEMPTY" },
#endif
#ifdef EPROCLIM
{ EPROCLIM, "EPROCLIM" },
#endif
#ifdef EUSERS
{ EUSERS, "EUSERS" },
#endif
#ifdef EDQUOT
{ EDQUOT, "EDQUOT" },
#endif
#ifdef ESTALE
{ ESTALE, "ESTALE" },
#endif
#ifdef EREMOTE
{ EREMOTE, "EREMOTE" },
#endif
#ifdef EBADRPC
{ EBADRPC, "EBADRPC" },
#endif
#ifdef ERPCMISMATCH
{ ERPCMISMATCH, "ERPCMISMATCH" },
#endif
#ifdef EPROGUNAVAIL
{ EPROGUNAVAIL, "EPROGUNAVAIL" },
#endif
#ifdef EPROGMISMATCH
{ EPROGMISMATCH, "EPROGMISMATCH" },
#endif
#ifdef EPROCUNAVAIL
{ EPROCUNAVAIL, "EPROCUNAVAIL" },
#endif
#ifdef ENOLCK
{ ENOLCK, "ENOLCK" },
#endif
#ifdef ENOSYS
{ ENOSYS, "ENOSYS" },
#endif
#ifdef EFTYPE
{ EFTYPE, "EFTYPE" },
#endif
#ifdef EAUTH
{ EAUTH, "EAUTH" },
#endif
#ifdef ENEEDAUTH
{ ENEEDAUTH, "ENEEDAUTH" },
#endif
#ifdef EPWROFF
{ EPWROFF, "EPWROFF" },
#endif
#ifdef EDEVERR
{ EDEVERR, "EDEVERR" },
#endif
#ifdef EOVERFLOW
{ EOVERFLOW, "EOVERFLOW" },
#endif
#ifdef EBADEXEC
{ EBADEXEC, "EBADEXEC" },
#endif
#ifdef EBADARCH
{ EBADARCH, "EBADARCH" },
#endif
#ifdef ESHLIBVERS
{ ESHLIBVERS, "ESHLIBVERS" },
#endif
#ifdef EBADMACHO
{ EBADMACHO, "EBADMACHO" },
#endif
#ifdef ECANCELED
{ ECANCELED, "ECANCELED" },
#endif
#ifdef EIDRM
{ EIDRM, "EIDRM" },
#endif
#ifdef ENOMSG
{ ENOMSG, "ENOMSG" },
#endif
#ifdef EILSEQ
{ EILSEQ, "EILSEQ" },
#endif
#ifdef ENOATTR
{ ENOATTR, "ENOATTR" },
#endif
#ifdef EBADMSG
{ EBADMSG, "EBADMSG" },
#endif
#ifdef EMULTIHOP
{ EMULTIHOP, "EMULTIHOP" },
#endif
#ifdef ENODATA
{ ENODATA, "ENODATA" },
#endif
#ifdef ENOLINK
{ ENOLINK, "ENOLINK" },
#endif
#ifdef ENOSR
{ ENOSR, "ENOSR" },
#endif
#ifdef ENOSTR
{ ENOSTR, "ENOSTR" },
#endif
#ifdef EPROTO
{ EPROTO, "EPROTO" },
#endif
#ifdef ETIME
{ ETIME, "ETIME" },
#endif
#ifdef EOPNOTSUPP
{ EOPNOTSUPP, "EOPNOTSUPP" },
#endif
#ifdef ENOPOLICY
{ ENOPOLICY, "ENOPOLICY" },
#endif
#ifdef ENOTRECOVERABLE
{ ENOTRECOVERABLE, "ENOTRECOVERABLE" },
#endif
#ifdef EOWNERDEAD
{ EOWNERDEAD, "EOWNERDEAD" },
#endif
};
for (unsigned int i = 0; i < sizeof(entries) / sizeof(Entry); i++) {
if (strcmp(entries[i].name, name) == 0) {
return entries[i].errorCode;
}
}
return -1;
}
static void
initializeSyscallFailureSimulation(const char *processName) {
// Format:
// PassengerAgent watchdog=EMFILE:0.1,ECONNREFUSED:0.25;PassengerAgent core=ESPIPE=0.4
const char *spec = getenv("PASSENGER_SIMULATE_SYSCALL_FAILURES");
string prefix = string(processName) + "=";
vector<string> components;
unsigned int i;
// Lookup this process in the specification string.
split(spec, ';', components);
for (i = 0; i < components.size(); i++) {
if (startsWith(components[i], prefix)) {
// Found!
string value = components[i].substr(prefix.size());
split(value, ',', components);
vector<string> keyAndValue;
vector<ErrorChance> chances;
// Process each errorCode:chance pair.
for (i = 0; i < components.size(); i++) {
split(components[i], ':', keyAndValue);
if (keyAndValue.size() != 2) {
fprintf(stderr, "%s: invalid syntax in PASSENGER_SIMULATE_SYSCALL_FAILURES: '%s'\n",
processName, components[i].c_str());
continue;
}
int e = lookupErrno(keyAndValue[0].c_str());
if (e == -1) {
fprintf(stderr, "%s: invalid error code in PASSENGER_SIMULATE_SYSCALL_FAILURES: '%s'\n",
processName, components[i].c_str());
continue;
}
ErrorChance chance;
chance.chance = atof(keyAndValue[1].c_str());
if (chance.chance < 0 || chance.chance > 1) {
fprintf(stderr, "%s: invalid chance PASSENGER_SIMULATE_SYSCALL_FAILURES: '%s' - chance must be between 0 and 1\n",
processName, components[i].c_str());
continue;
}
chance.errorCode = e;
chances.push_back(chance);
}
// Install the chances.
setup_random_failure_simulation(&chances[0], chances.size());
return;
}
}
}
static bool
isBlank(const char *str) {
while (*str != '\0') {
if (*str != ' ') {
return false;
}
str++;
}
return true;
}
static bool
extraArgumentsPassed(int argc, char *argv[], int argStartIndex) {
assert(argc >= argStartIndex);
return argc > argStartIndex + 1
// Allow the Watchdog to pass an all-whitespace argument. This
// argument provides the memory space for us to change the process title.
|| (argc == argStartIndex + 1 && !isBlank(argv[argStartIndex]));
}
static void
parseAndCommitConfig(ConfigKit::Store &config, const StaticString &jsonData) {
Json::Reader reader;
Json::Value doc;
if (getEnvBool("PASSENGER_DEBUG_INITIAL_CONFIG", false)) {
P_NOTICE("Initial raw configuration: " << jsonData);
}
if (reader.parse(jsonData, doc)) {
vector<ConfigKit::Error> errors;
if (!config.update(doc, errors)) {
vector<ConfigKit::Error>::const_iterator it, end = errors.end();
fprintf(stderr, "ERROR: invalid configuration:\n");
for (it = errors.begin(); it != end; it++) {
fprintf(stderr, "- %s\n", it->getMessage().c_str());
}
fprintf(stderr, "Raw configuration: %s\n", doc.toStyledString().c_str());
exit(1);
}
} else {
fprintf(stderr, "ERROR: JSON configuration parse error: %s\n",
reader.getFormattedErrorMessages().c_str());
fprintf(stderr, "Raw JSON data: %s\n", jsonData.toString().c_str());
exit(1);
}
}
static void
readConfigFromFd(int fd, ConfigKit::Store &config) {
parseAndCommitConfig(config, readScalarMessage(fd));
}
static void
readConfigFromJsonPassedToArgs(int argc, char **argv[], int argStartIndex, ConfigKit::Store &config) {
if (argc <= argStartIndex) {
return;
}
parseAndCommitConfig(config, (*argv)[argStartIndex]);
}
static void
maybeInitializeAbortHandler() {
if (!getEnvBool("PASSENGER_ABORT_HANDLER", true)) {
return;
}
AbortHandlerConfig *config = &context->abortHandlerConfig;
config->origArgv = context->origArgv;
config->randomSeed = context->randomSeed;
config->dumpWithCrashWatch = getEnvBool("PASSENGER_DUMP_WITH_CRASH_WATCH", true);
config->beep = getEnvBool("PASSENGER_BEEP_ON_ABORT");
config->stopProcess = getEnvBool("PASSENGER_STOP_ON_ABORT");
config->forceTerminateProcess = getEnvBool("PASSENGER_FORCE_TERMINATE_ON_ABORT");
installAbortHandler(config);
}
static void
maybeInitializeSyscallFailureSimulation(const char *processName) {
if (getEnvBool("PASSENGER_SIMULATE_SYSCALL_FAILURES")) {
initializeSyscallFailureSimulation(processName);
}
}
static void
initializeLoggingKit(const char *processName, ConfigKit::Store &config,
const ConfigKit::Translator &loggingKitTranslator,
const LoggingKitPreInitFunc &loggingKitPreInitFunc)
{
Json::Value initialConfig = config.inspectEffectiveValues();
if (loggingKitPreInitFunc != NULL) {
loggingKitPreInitFunc(initialConfig);
}
LoggingKit::initialize(initialConfig, loggingKitTranslator);
Json::Value dump = LoggingKit::context->inspectConfig();
if (!dump["file_descriptor_log_target"]["effective_value"].isNull()) {
// This information helps ./dev/parse_file_descriptor_log.
FastStringStream<> stream;
LoggingKit::_prepareLogEntry(stream, LoggingKit::CRIT, __FILE__, __LINE__);
stream << "Starting agent: " << processName << "\n";
_writeFileDescriptorLogEntry(LoggingKit::context->getConfigRealization(),
stream.data(), stream.size());
P_LOG_FILE_DESCRIPTOR_OPEN4(
LoggingKit::context->getConfigRealization()->fileDescriptorLogTargetFd,
__FILE__, __LINE__,
"file descriptor log file "
<< dump["file_descriptor_log_target"]["effective_value"]["path"].asString());
} else {
// This information helps ./dev/parse_file_descriptor_log.
P_DEBUG("Starting agent: " << processName);
}
if (getEnvBool("PASSENGER_USE_FEEDBACK_FD")) {
P_LOG_FILE_DESCRIPTOR_OPEN2(FEEDBACK_FD, "feedback FD");
}
if (abortHandlerInstalled()) {
abortHandlerLogFds();
}
}
static void
storeArgvCopy(int argc, char *argv[]) {
// Make a copy of the arguments before changing process title.
context->origArgc = argc;
context->origArgv = (char **) malloc(argc * sizeof(char *));
for (int i = 0; i < argc; i++) {
context->origArgv[i] = strdup(argv[i]);
}
if (abortHandlerInstalled()) {
// Let AbortHandler use the copy.
context->abortHandlerConfig.origArgv = context->origArgv;
abortHandlerConfigChanged();
}
}
static void
changeProcessTitle(int argc, char **argv[], const char *processName) {
size_t totalArgLen = strlen((*argv)[0]);
for (int i = 1; i < argc; i++) {
size_t len = strlen((*argv)[i]);
totalArgLen += len + 1;
memset((*argv)[i], '\0', len);
}
strncpy((*argv)[0], processName, totalArgLen);
*argv = context->origArgv;
}
static string
dumpConfigForDebugging(const ConfigKit::Store &config) {
Json::Value result = config.inspectEffectiveValues();
if (!result["config_manifest"].isNull()) {
// The config manifest is too large so we omit it from the debug output.
result["config_manifest"] = "[OMITTED]";
}
return result.toStyledString();
}
void
initializeAgent(int argc, char **argv[], const char *processName,
ConfigKit::Store &config, const ConfigKit::Translator &loggingKitTranslator,
OptionParserFunc optionParser,
const LoggingKitPreInitFunc &loggingKitPreInitFunc,
int argStartIndex)
{
const char *seedStr;
context = new Context(argc, *argv);
seedStr = getEnvString("PASSENGER_RANDOM_SEED");
if (seedStr == NULL) {
context->randomSeed = (unsigned int) time(NULL);
} else {
context->randomSeed = (unsigned int) atoll(seedStr);
}
srand(context->randomSeed);
srandom(context->randomSeed);
ignoreSigpipe();
maybeInitializeAbortHandler();
oxt::initialize();
setup_syscall_interruption_support();
maybeInitializeSyscallFailureSimulation(processName);
SystemTime::initialize();
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
TRACE_POINT();
try {
if (getEnvBool("PASSENGER_USE_FEEDBACK_FD")) {
if (extraArgumentsPassed(argc, *argv, argStartIndex)) {
fprintf(stderr, "No arguments may be passed when using the feedback FD.\n");
exit(1);
}
context->feedbackFdAvailable = true;
readConfigFromFd(FEEDBACK_FD, config);
} else if (optionParser != NULL) {
optionParser(argc, const_cast<const char **>(*argv), config);
} else {
readConfigFromJsonPassedToArgs(argc, argv, argStartIndex, config);
}
if (!config["passenger_root"].isNull()) {
context->resourceLocator = new ResourceLocator(config["passenger_root"].asString());
if (abortHandlerInstalled()) {
string defaultRuby = config["default_ruby"].asString();
if (defaultRuby.empty()) {
defaultRuby = DEFAULT_RUBY;
}
context->abortHandlerConfig.ruby = strdup(defaultRuby.c_str());
context->abortHandlerConfig.resourceLocator = context->resourceLocator;
abortHandlerConfigChanged();
}
}
initializeLoggingKit(processName, config, loggingKitTranslator,
loggingKitPreInitFunc);
} catch (const tracable_exception &e) {
P_ERROR("*** ERROR: " << e.what() << "\n" << e.backtrace());
exit(1);
}
storeArgvCopy(argc, *argv);
changeProcessTitle(argc, argv, processName);
P_DEBUG(processName << " config: " << dumpConfigForDebugging(config));
P_DEBUG(processName << " random seed: " << context->randomSeed);
}
void
shutdownAgent(ConfigKit::Schema *schema, ConfigKit::Store *config) {
LoggingKit::shutdown();
oxt::shutdown();
if (abortHandlerInstalled()) {
shutdownAbortHandler();
free(context->abortHandlerConfig.ruby);
}
for (int i = 0; i < context->origArgc; i++) {
free(context->origArgv[i]);
}
free(context->origArgv);
delete context->resourceLocator;
delete context;
context = NULL;
delete config;
delete schema;
}
void
restoreOomScore(const string &score) {
bool isLegacy;
int ret = tryRestoreOomScore(score, isLegacy);
if (ret != 0) {
P_WARN("Unable to set OOM score to " << score << " (legacy: " << isLegacy
<< ") due to error: " << strerror(ret)
<< " (process will remain at inherited OOM score)");
}
}
} // namespace Fundamentals
} // namespace Agent
} // namespace Passenger