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tor-android/external/badvpn_dns/ncd/ncd.c

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/**
* @file ncd.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <misc/version.h>
#include <misc/loglevel.h>
#include <misc/open_standard_streams.h>
#include <misc/string_begins_with.h>
#include <base/BLog.h>
#include <system/BReactor.h>
#include <system/BSignal.h>
#include <system/BProcess.h>
#include <udevmonitor/NCDUdevManager.h>
#include <random/BRandom2.h>
#include <ncd/NCDInterpreter.h>
#include <ncd/NCDBuildProgram.h>
#ifdef BADVPN_USE_SYSLOG
#include <base/BLog_syslog.h>
#endif
#include "ncd.h"
#include <generated/blog_channel_ncd.h>
#define LOGGER_STDOUT 1
#define LOGGER_STDERR 2
#define LOGGER_SYSLOG 3
// command-line options
static struct {
int help;
int version;
int logger;
#ifdef BADVPN_USE_SYSLOG
char *logger_syslog_facility;
char *logger_syslog_ident;
#endif
int loglevel;
int loglevels[BLOG_NUM_CHANNELS];
char *config_file;
int syntax_only;
int retry_time;
int no_udev;
char **extra_args;
int num_extra_args;
} options;
// reactor
static BReactor reactor;
// process manager
static BProcessManager manager;
// udev manager
static NCDUdevManager umanager;
// random number generator
static BRandom2 random2;
// interpreter
static NCDInterpreter interpreter;
// forward declarations of functions
static void print_help (const char *name);
static void print_version (void);
static int parse_arguments (int argc, char *argv[]);
static void signal_handler (void *unused);
static void interpreter_handler_finished (void *user, int exit_code);
int main (int argc, char **argv)
{
if (argc <= 0) {
return 1;
}
int main_exit_code = 1;
// open standard streams
open_standard_streams();
// parse command-line arguments
if (!parse_arguments(argc, argv)) {
fprintf(stderr, "Failed to parse arguments\n");
print_help(argv[0]);
goto fail0;
}
// handle --help and --version
if (options.help) {
print_version();
print_help(argv[0]);
return 0;
}
if (options.version) {
print_version();
return 0;
}
// initialize logger
switch (options.logger) {
case LOGGER_STDOUT:
BLog_InitStdout();
break;
case LOGGER_STDERR:
BLog_InitStderr();
break;
#ifdef BADVPN_USE_SYSLOG
case LOGGER_SYSLOG:
if (!BLog_InitSyslog(options.logger_syslog_ident, options.logger_syslog_facility)) {
fprintf(stderr, "Failed to initialize syslog logger\n");
goto fail0;
}
break;
#endif
default:
ASSERT(0);
}
// configure logger channels
for (int i = 0; i < BLOG_NUM_CHANNELS; i++) {
if (options.loglevels[i] >= 0) {
BLog_SetChannelLoglevel(i, options.loglevels[i]);
}
else if (options.loglevel >= 0) {
BLog_SetChannelLoglevel(i, options.loglevel);
} else {
BLog_SetChannelLoglevel(i, DEFAULT_LOGLEVEL);
}
}
BLog(BLOG_NOTICE, "initializing "GLOBAL_PRODUCT_NAME" "PROGRAM_NAME" "GLOBAL_VERSION);
// initialize network
if (!BNetwork_GlobalInit()) {
BLog(BLOG_ERROR, "BNetwork_GlobalInit failed");
goto fail1;
}
// init time
BTime_Init();
// init reactor
if (!BReactor_Init(&reactor)) {
BLog(BLOG_ERROR, "BReactor_Init failed");
goto fail1;
}
// init process manager
if (!BProcessManager_Init(&manager, &reactor)) {
BLog(BLOG_ERROR, "BProcessManager_Init failed");
goto fail2;
}
// init udev manager
NCDUdevManager_Init(&umanager, options.no_udev, &reactor, &manager);
// init random number generator
if (!BRandom2_Init(&random2, BRANDOM2_INIT_LAZY)) {
BLog(BLOG_ERROR, "BRandom2_Init failed");
goto fail3;
}
// setup signal handler
if (!BSignal_Init(&reactor, signal_handler, NULL)) {
BLog(BLOG_ERROR, "BSignal_Init failed");
goto fail4;
}
// build program
NCDProgram program;
if (!NCDBuildProgram_Build(options.config_file, &program)) {
BLog(BLOG_ERROR, "failed to build program");
goto fail5;
}
// setup interpreter parameters
struct NCDInterpreter_params params;
params.handler_finished = interpreter_handler_finished;
params.user = NULL;
params.retry_time = options.retry_time;
params.extra_args = options.extra_args;
params.num_extra_args = options.num_extra_args;
params.reactor = &reactor;
params.manager = &manager;
params.umanager = &umanager;
params.random2 = &random2;
// initialize interpreter
if (!NCDInterpreter_Init(&interpreter, program, params)) {
goto fail5;
}
// don't enter event loop if syntax check is requested
if (options.syntax_only) {
main_exit_code = 0;
goto fail6;
}
BLog(BLOG_NOTICE, "entering event loop");
// enter event loop
main_exit_code = BReactor_Exec(&reactor);
fail6:
// free interpreter
NCDInterpreter_Free(&interpreter);
fail5:
// remove signal handler
BSignal_Finish();
fail4:
// free random number generator
BRandom2_Free(&random2);
fail3:
// free udev manager
NCDUdevManager_Free(&umanager);
// free process manager
BProcessManager_Free(&manager);
fail2:
// free reactor
BReactor_Free(&reactor);
fail1:
// free logger
BLog(BLOG_NOTICE, "exiting");
BLog_Free();
fail0:
// finish objects
DebugObjectGlobal_Finish();
return main_exit_code;
}
void print_help (const char *name)
{
printf(
"Usage:\n"
" %s\n"
" [--help]\n"
" [--version]\n"
" [--logger <stdout/stderr/syslog>]\n"
" (logger=syslog?\n"
" [--syslog-facility <string>]\n"
" [--syslog-ident <string>]\n"
" )\n"
" [--loglevel <0-5/none/error/warning/notice/info/debug>]\n"
" [--channel-loglevel <channel-name> <0-5/none/error/warning/notice/info/debug>] ...\n"
" [--retry-time <ms>]\n"
" [--no-udev]\n"
" [--config-file <ncd_program_file>]\n"
" [--syntax-only]\n"
" [-- program_args...]\n"
" [<ncd_program_file> program_args...]\n" ,
name
);
}
void print_version (void)
{
printf(GLOBAL_PRODUCT_NAME" "PROGRAM_NAME" "GLOBAL_VERSION"\n"GLOBAL_COPYRIGHT_NOTICE"\n");
}
int parse_arguments (int argc, char *argv[])
{
if (argc <= 0) {
return 0;
}
options.help = 0;
options.version = 0;
options.logger = LOGGER_STDERR;
#ifdef BADVPN_USE_SYSLOG
options.logger_syslog_facility = "daemon";
options.logger_syslog_ident = argv[0];
#endif
options.loglevel = -1;
for (int i = 0; i < BLOG_NUM_CHANNELS; i++) {
options.loglevels[i] = -1;
}
options.config_file = NULL;
options.syntax_only = 0;
options.retry_time = DEFAULT_RETRY_TIME;
options.no_udev = 0;
options.extra_args = NULL;
options.num_extra_args = 0;
for (int i = 1; i < argc; i++) {
char *arg = argv[i];
if (!strcmp(arg, "--help")) {
options.help = 1;
}
else if (!strcmp(arg, "--version")) {
options.version = 1;
}
else if (!strcmp(arg, "--logger")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
char *arg2 = argv[i + 1];
if (!strcmp(arg2, "stdout")) {
options.logger = LOGGER_STDOUT;
}
else if (!strcmp(arg2, "stderr")) {
options.logger = LOGGER_STDERR;
}
#ifdef BADVPN_USE_SYSLOG
else if (!strcmp(arg2, "syslog")) {
options.logger = LOGGER_SYSLOG;
}
#endif
else {
fprintf(stderr, "%s: wrong argument\n", arg);
return 0;
}
i++;
}
#ifdef BADVPN_USE_SYSLOG
else if (!strcmp(arg, "--syslog-facility")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
options.logger_syslog_facility = argv[i + 1];
i++;
}
else if (!strcmp(arg, "--syslog-ident")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
options.logger_syslog_ident = argv[i + 1];
i++;
}
#endif
else if (!strcmp(arg, "--loglevel")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
if ((options.loglevel = parse_loglevel(argv[i + 1])) < 0) {
fprintf(stderr, "%s: wrong argument\n", arg);
return 0;
}
i++;
}
else if (!strcmp(arg, "--channel-loglevel")) {
if (2 >= argc - i) {
fprintf(stderr, "%s: requires two arguments\n", arg);
return 0;
}
int channel = BLogGlobal_GetChannelByName(argv[i + 1]);
if (channel < 0) {
fprintf(stderr, "%s: wrong channel argument\n", arg);
return 0;
}
int loglevel = parse_loglevel(argv[i + 2]);
if (loglevel < 0) {
fprintf(stderr, "%s: wrong loglevel argument\n", arg);
return 0;
}
options.loglevels[channel] = loglevel;
i += 2;
}
else if (!strcmp(arg, "--config-file")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
options.config_file = argv[i + 1];
i++;
}
else if (!strcmp(arg, "--syntax-only")) {
options.syntax_only = 1;
}
else if (!strcmp(arg, "--retry-time")) {
if (1 >= argc - i) {
fprintf(stderr, "%s: requires an argument\n", arg);
return 0;
}
if ((options.retry_time = atoi(argv[i + 1])) < 0) {
fprintf(stderr, "%s: wrong argument\n", arg);
return 0;
}
i++;
}
else if (!strcmp(arg, "--no-udev")) {
options.no_udev = 1;
}
else if (!strcmp(arg, "--")) {
options.extra_args = &argv[i + 1];
options.num_extra_args = argc - i - 1;
i += options.num_extra_args;
}
else if (!string_begins_with(arg, "--")) {
if (options.config_file) {
fprintf(stderr, "%s: program is already specified (did you mean to use -- ?)\n", arg);
return 0;
}
options.config_file = argv[i];
options.extra_args = &argv[i + 1];
options.num_extra_args = argc - i - 1;
i += options.num_extra_args;
}
else {
fprintf(stderr, "unknown option: %s\n", arg);
return 0;
}
}
if (options.help || options.version) {
return 1;
}
if (!options.config_file) {
fprintf(stderr, "No program is specified.\n");
return 0;
}
return 1;
}
void signal_handler (void *unused)
{
BLog(BLOG_NOTICE, "termination requested");
NCDInterpreter_RequestShutdown(&interpreter, 1);
}
void interpreter_handler_finished (void *user, int exit_code)
{
BReactor_Quit(&reactor, exit_code);
}
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