telodendria/src/Main.c

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/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* 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 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <grp.h>
#include <pwd.h>
#include <Telodendria.h>
#include <Memory.h>
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#include <Config.h>
#include <Log.h>
#include <HashMap.h>
#include <Json.h>
#include <HttpServer.h>
#include <Matrix.h>
#include <Db.h>
#include <Cron.h>
#include <Uia.h>
#include <Util.h>
static Array *httpServers = NULL;
static void
TelodendriaSignalHandler(int signal)
{
size_t i;
switch (signal)
{
case SIGPIPE:
return;
case SIGINT:
if (!httpServers)
{
return;
}
for (i = 0; i < ArraySize(httpServers); i++)
{
HttpServer *server = ArrayGet(httpServers, i);
HttpServerStop(server);
}
break;
}
}
typedef enum ArgFlag
{
ARG_VERSION = (1 << 0),
ARG_CONFIGTEST = (1 << 1),
ARG_VERBOSE = (1 << 2)
} ArgFlag;
int
main(int argc, char **argv)
{
int exit = EXIT_SUCCESS;
/* Arg parsing */
int opt;
int flags = 0;
char *configArg = NULL;
/* Config file */
Stream *configFile = NULL;
HashMap *config = NULL;
/* Program configuration */
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Config *tConfig = NULL;
/* User validation */
struct passwd *userInfo = NULL;
struct group *groupInfo = NULL;
/* HTTP server management */
size_t i;
HttpServer *server;
/* Signal handling */
struct sigaction sigAction;
MatrixHttpHandlerArgs matrixArgs;
Cron *cron = NULL;
memset(&matrixArgs, 0, sizeof(matrixArgs));
if (!LogConfigGlobal())
{
printf("Fatal error: unable to allocate memory for logger.\n");
return EXIT_FAILURE;
}
TelodendriaPrintHeader();
while ((opt = getopt(argc, argv, "f:Vvn")) != -1)
{
switch (opt)
{
case 'f':
configArg = optarg;
break;
case 'V':
flags |= ARG_VERSION;
break;
case 'v':
flags |= ARG_VERBOSE;
break;
case 'n':
flags |= ARG_CONFIGTEST;
break;
case '?':
exit = EXIT_FAILURE;
goto finish;
default:
break;
}
}
if (flags & ARG_VERBOSE)
{
LogConfigLevelSet(LogConfigGlobal(), LOG_DEBUG);
MemoryHook(TelodendriaMemoryHook, NULL);
}
if (flags & ARG_VERSION)
{
goto finish;
}
if (!configArg)
{
Log(LOG_ERR, "No configuration file specified.");
exit = EXIT_FAILURE;
goto finish;
}
else if (strcmp(configArg, "-") == 0)
{
configFile = StreamStdin();
}
else
{
StreamClose(StreamStdin());
configFile = StreamOpen(configArg, "r");
if (!configFile)
{
Log(LOG_ERR, "Unable to open configuration file '%s' for reading.", configArg);
exit = EXIT_FAILURE;
goto finish;
}
}
Log(LOG_NOTICE, "Processing configuration file '%s'.", configArg);
config = JsonDecode(configFile);
StreamClose(configFile);
if (!config)
{
Log(LOG_ERR, "Syntax error in configuration file.");
exit = EXIT_FAILURE;
goto finish;
}
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tConfig = ConfigParse(config);
JsonFree(config);
if (!tConfig)
{
exit = EXIT_FAILURE;
goto finish;
}
if (flags & ARG_CONFIGTEST)
{
Log(LOG_INFO, "Configuration is OK.");
goto finish;
}
if (!tConfig->logTimestamp || strcmp(tConfig->logTimestamp, "default") != 0)
{
LogConfigTimeStampFormatSet(LogConfigGlobal(), tConfig->logTimestamp);
}
else
{
Free(tConfig->logTimestamp);
tConfig->logTimestamp = NULL;
}
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if (tConfig->flags & CONFIG_LOG_COLOR)
{
LogConfigFlagSet(LogConfigGlobal(), LOG_FLAG_COLOR);
}
else
{
LogConfigFlagClear(LogConfigGlobal(), LOG_FLAG_COLOR);
}
LogConfigLevelSet(LogConfigGlobal(), flags & ARG_VERBOSE ? LOG_DEBUG : tConfig->logLevel);
if (chdir(tConfig->dataDir) != 0)
{
Log(LOG_ERR, "Unable to change into data directory: %s.", strerror(errno));
exit = EXIT_FAILURE;
goto finish;
}
else
{
Log(LOG_DEBUG, "Changed working directory to: %s", tConfig->dataDir);
}
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if (tConfig->flags & CONFIG_LOG_FILE)
{
Stream *logFile = StreamOpen("telodendria.log", "a");
if (!logFile)
{
Log(LOG_ERR, "Unable to open log file for appending.");
exit = EXIT_FAILURE;
tConfig->flags &= CONFIG_LOG_STDOUT;
goto finish;
}
Log(LOG_INFO, "Logging to the log file. Check there for all future messages.");
LogConfigOutputSet(LogConfigGlobal(), logFile);
StreamClose(StreamStdout());
}
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else if (tConfig->flags & CONFIG_LOG_STDOUT)
{
Log(LOG_DEBUG, "Already logging to standard output.");
}
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else if (tConfig->flags & CONFIG_LOG_SYSLOG)
{
Log(LOG_INFO, "Logging to the syslog. Check there for all future messages.");
LogConfigFlagSet(LogConfigGlobal(), LOG_FLAG_SYSLOG);
openlog("telodendria", LOG_PID | LOG_NDELAY, LOG_DAEMON);
/* Always log everything, because the Log API will control what
* messages get passed to the syslog */
setlogmask(LOG_UPTO(LOG_DEBUG));
}
else
{
Log(LOG_ERR, "Unknown logging method in flags: '%d'", tConfig->flags);
Log(LOG_ERR, "This is a programmer error; please report it.");
exit = EXIT_FAILURE;
goto finish;
}
Log(LOG_DEBUG, "Configuration:");
LogConfigIndent(LogConfigGlobal());
Log(LOG_DEBUG, "Server Name: %s", tConfig->serverName);
Log(LOG_DEBUG, "Base URL: %s", tConfig->baseUrl);
Log(LOG_DEBUG, "Identity Server: %s", tConfig->identityServer);
Log(LOG_DEBUG, "Run As: %s:%s", tConfig->uid, tConfig->gid);
Log(LOG_DEBUG, "Data Directory: %s", tConfig->dataDir);
Log(LOG_DEBUG, "Max Cache: %ld", tConfig->maxCache);
Log(LOG_DEBUG, "Flags: %x", tConfig->flags);
LogConfigUnindent(LogConfigGlobal());
/* Arguments to pass into the HTTP handler */
matrixArgs.config = tConfig;
httpServers = ArrayCreate();
if (!httpServers)
{
Log(LOG_ERR, "Error setting up HTTP server.");
exit = EXIT_FAILURE;
goto finish;
}
/* Bind servers before possibly dropping permissions. */
for (i = 0; i < ArraySize(tConfig->servers); i++)
{
HttpServerConfig *serverCfg = ArrayGet(tConfig->servers, i);
Log(LOG_DEBUG, "HTTP listener: %lu", i);
LogConfigIndent(LogConfigGlobal());
Log(LOG_DEBUG, "Port: %hu", serverCfg->port);
Log(LOG_DEBUG, "Threads: %u", serverCfg->threads);
Log(LOG_DEBUG, "Max Connections: %u", serverCfg->maxConnections);
Log(LOG_DEBUG, "Flags: %d", serverCfg->flags);
Log(LOG_DEBUG, "TLS Cert: %s", serverCfg->tlsCert);
Log(LOG_DEBUG, "TLS Key: %s", serverCfg->tlsKey);
LogConfigUnindent(LogConfigGlobal());
serverCfg->handler = MatrixHttpHandler;
serverCfg->handlerArgs = &matrixArgs;
if (serverCfg->flags & HTTP_FLAG_TLS)
{
if (!UtilLastModified(serverCfg->tlsCert))
{
Log(LOG_ERR, "%s: %s", strerror(errno), serverCfg->tlsCert);
exit = EXIT_FAILURE;
goto finish;
}
if (!UtilLastModified(serverCfg->tlsKey))
{
Log(LOG_ERR, "%s: %s", strerror(errno), serverCfg->tlsKey);
exit = EXIT_FAILURE;
goto finish;
}
}
server = HttpServerCreate(serverCfg);
if (!server)
{
Log(LOG_ERR, "Unable to create HTTP server on port %d: %s",
serverCfg->port, strerror(errno));
exit = EXIT_FAILURE;
goto finish;
}
ArrayAdd(httpServers, server);
}
if (!ArraySize(httpServers))
{
Log(LOG_ERR, "No valid HTTP listeners specified in the configuration.");
exit = EXIT_FAILURE;
goto finish;
}
Log(LOG_DEBUG, "Running as uid:gid: %d:%d.", getuid(), getgid());
if (tConfig->uid && tConfig->gid)
{
userInfo = getpwnam(tConfig->uid);
groupInfo = getgrnam(tConfig->gid);
if (!userInfo || !groupInfo)
{
Log(LOG_ERR, "Unable to locate the user/group specified in the configuration.");
exit = EXIT_FAILURE;
goto finish;
}
else
{
Log(LOG_DEBUG, "Found user/group information using getpwnam() and getgrnam().");
}
}
else
{
Log(LOG_DEBUG, "No user/group info specified in the config.");
}
if (getuid() == 0)
{
if (userInfo && groupInfo)
{
if (setgid(groupInfo->gr_gid) != 0 || setuid(userInfo->pw_uid) != 0)
{
Log(LOG_ERR, "Unable to set process uid/gid.");
exit = EXIT_FAILURE;
goto finish;
}
else
{
Log(LOG_DEBUG, "Set uid/gid to %s:%s.", tConfig->uid, tConfig->gid);
}
}
else
{
Log(LOG_WARNING, "We are running as root, and we are not dropping to another user");
Log(LOG_WARNING, "because none was specified in the configuration file.");
Log(LOG_WARNING, "This is probably a security issue.");
}
}
else
{
if (tConfig->uid && tConfig->gid)
{
if (getuid() != userInfo->pw_uid || getgid() != groupInfo->gr_gid)
{
Log(LOG_WARNING, "Not running as the uid/gid specified in the configuration.");
}
else
{
Log(LOG_DEBUG, "Running as the uid/gid specified in the configuration.");
}
}
}
/* These config values are no longer needed; don't hold them in
* memory anymore */
Free(tConfig->dataDir);
Free(tConfig->uid);
Free(tConfig->gid);
tConfig->dataDir = NULL;
tConfig->uid = NULL;
tConfig->gid = NULL;
if (!tConfig->maxCache)
{
Log(LOG_WARNING, "Database caching is disabled.");
Log(LOG_WARNING, "If this is not what you intended, check the config file");
Log(LOG_WARNING, "and ensure that maxCache is a valid number of bytes.");
}
matrixArgs.db = DbOpen(".", tConfig->maxCache);
if (!matrixArgs.db)
{
Log(LOG_ERR, "Unable to open data directory as a database.");
exit = EXIT_FAILURE;
goto finish;
}
else
{
Log(LOG_DEBUG, "Opened database.");
}
cron = CronCreate(60 * 1000); /* 1-minute tick */
if (!cron)
{
Log(LOG_ERR, "Unable to set up job scheduler.");
exit = EXIT_FAILURE;
goto finish;
}
Log(LOG_DEBUG, "Registering jobs...");
CronEvery(cron, 30 * 60 * 1000, (JobFunc *) UiaCleanup, &matrixArgs);
Log(LOG_NOTICE, "Starting job scheduler...");
CronStart(cron);
Log(LOG_NOTICE, "Starting server...");
for (i = 0; i < ArraySize(httpServers); i++)
{
HttpServerConfig *serverCfg;
server = ArrayGet(httpServers, i);
serverCfg = HttpServerConfigGet(server);
if (!HttpServerStart(server))
{
Log(LOG_ERR, "Unable to start HTTP server %lu on port %hu.", i, serverCfg->port);
exit = EXIT_FAILURE;
goto finish;
}
else
{
Log(LOG_DEBUG, "Started HTTP server %lu.", i);
Log(LOG_INFO, "Listening on port: %hu", serverCfg->port);
}
}
sigAction.sa_handler = TelodendriaSignalHandler;
sigfillset(&sigAction.sa_mask);
sigAction.sa_flags = SA_RESTART;
#define SIGACTION(sig, act, oact) \
if (sigaction(sig, act, oact) < 0) \
{ \
Log(LOG_ERR, "Unable to install signal handler: %s", #sig); \
exit = EXIT_FAILURE; \
goto finish; \
} \
else \
{ \
Log(LOG_DEBUG, "Installed signal handler: %s", #sig); \
}
SIGACTION(SIGINT, &sigAction, NULL);
SIGACTION(SIGPIPE, &sigAction, NULL);
#undef SIGACTION
/* Block this thread until the servers are terminated by a signal
* handler */
for (i = 0; i < ArraySize(httpServers); i++)
{
server = ArrayGet(httpServers, i);
HttpServerJoin(server);
Log(LOG_DEBUG, "Joined HTTP server %lu.", i);
}
finish:
Log(LOG_NOTICE, "Shutting down...");
if (httpServers)
{
for (i = 0; i < ArraySize(httpServers); i++)
{
Log(LOG_DEBUG, "Freeing HTTP server %lu...", i);
server = ArrayGet(httpServers, i);
HttpServerStop(server);
HttpServerFree(server);
Log(LOG_DEBUG, "Freed HTTP server %lu.", i);
}
ArrayFree(httpServers);
Log(LOG_DEBUG, "Freed HTTP servers array.");
}
if (cron)
{
CronStop(cron);
CronFree(cron);
Log(LOG_DEBUG, "Stopped and freed job scheduler.");
}
DbClose(matrixArgs.db);
Log(LOG_DEBUG, "Closed database.");
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ConfigFree(tConfig);
Log(LOG_DEBUG, "Exiting with code '%d'.", exit);
/*
* Uninstall the memory hook because it uses the Log
* API, whose configuration is being freed now, so it
* won't work anymore.
*/
MemoryHook(NULL, NULL);
LogConfigFree(LogConfigGlobal());
/* Standard error should never have been opened, but just in case
* it was, this doesn't hurt anything. */
StreamClose(StreamStderr());
/* Generate a memory report if any leaks occurred. At this point no
* memory should be allocated. */
TelodendriaGenerateMemReport();
/* Free any leaked memory now, just in case the operating system
* we're running on won't do it for us. */
MemoryFreeAll();
return exit;
}