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// -*- mode: c++; c-basic-offset: 2; -*-
#include "common.hh"
#include <cstring>
#include <memory>
#include <signal.h>
#include <unistd.h>
#include "args.hh"
#include "config.hh"
#include "io.hh"
#include "logger.hh"
#include "looper.hh"
#include "proxy.hh"
#include "resolver.hh"
namespace {
Proxy* g_proxy;
void proxy_quit(int UNUSED(sig)) {
g_proxy->quit();
}
void proxy_reload(int UNUSED(sig)) {
g_proxy->reload();
}
void setup_signals(Proxy* proxy) {
g_proxy = proxy;
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_handler = proxy_quit;
action.sa_flags = SA_RESTART;
sigaction(SIGINT, &action, nullptr);
sigaction(SIGQUIT, &action, nullptr);
action.sa_handler = proxy_reload;
sigaction(SIGHUP, &action, nullptr);
}
std::string get_cwd() {
std::string ret;
char buf[128];
auto ptr = getcwd(buf, 128);
if (ptr) {
ret.assign(ptr, strlen(ptr));
return ret;
}
if (errno != ERANGE) return ret;
ret.resize(1024);
while (true) {
ptr = getcwd(&ret[0], ret.size());
if (ptr) {
ret.resize(strlen(ret.data()));
break;
}
if (errno != ERANGE) {
ret.resize(0);
break;
}
ret.resize(ret.size() * 2);
}
return ret;
}
} // namespace
int main(int argc, char** argv) {
std::unique_ptr<Args> args(Args::create());
args->add('C', "config", "FILE", "load config from FILE instead of default");
args->add('F', "foreground", "do not fork into background and log to stdout");
args->add('m', "monitor", "HOST:PORT", "accept monitors on HOST:PORT");
args->add('h', "help", "display this text and exit.");
args->add('V', "version", "display version and exit.");
if (!args->run(argc, argv)) {
std::cerr << "Try `tp --help` for usage." << std::endl;
return EXIT_FAILURE;
}
if (args->is_set('h')) {
std::cout << "Usage: `tp [OPTIONS...] [BIND][:PORT]`\n"
<< "Transparent proxy.\n"
<< '\n';
args->print_help();
return EXIT_SUCCESS;
}
if (args->is_set('V')) {
std::cout << "TransparentProxy version " VERSION
<< " written by Joel Klinghed <the_jk@yahoo.com>" << std::endl;
return EXIT_SUCCESS;
}
std::unique_ptr<Config> config(Config::create());
switch (args->arguments().size()) {
case 0:
break;
case 1: {
auto arg = args->arguments().front();
auto colon = arg.find(':');
if (colon == std::string::npos) {
config->set("proxy_bind", arg);
} else {
if (colon > 0) {
config->set("proxy_bind", arg.substr(0, colon));
}
config->set("proxy_port", arg.substr(colon + 1));
}
break;
}
default:
std::cerr << "Too many arguments.\n"
<< "Try `tp --help` for usage." << std::endl;
return EXIT_FAILURE;
}
if (args->is_set('F')) {
config->set("foreground", "true");
}
auto monitor = args->arg('m', nullptr);
if (monitor) {
auto str = std::string(monitor);
auto colon = str.find(':');
if (colon == 0 || colon == std::string::npos) {
std::cerr << "Invalid argument to monitor, expected HOST:PORT not: "
<< str << std::endl;
return EXIT_FAILURE;
}
config->set("monitor", "true");
config->set("monitor_bind", str.substr(0, colon));
config->set("monitor_port", str.substr(colon + 1));
}
auto configfile = args->arg('C', nullptr);
if (configfile) {
config->load_file(configfile);
} else {
config->load_name("tp");
}
if (!config->good()) {
std::cerr << "Error loading config\n"
<< config->last_error() << std::endl;
return EXIT_FAILURE;
}
std::unique_ptr<Logger> logger(Logger::create_stderr());
std::unique_ptr<Logger> file_logger;
auto logfile = args->arg('l', nullptr);
bool logfile_from_argument;
if (!logfile) {
logfile = config->get("logfile", nullptr);
logfile_from_argument = false;
} else {
logfile_from_argument = true;
}
if (logfile) {
if (logfile[0] != '/') {
logger->out(Logger::ERR, "Logfile need to be an absolute path, not: %s",
logfile);
return EXIT_FAILURE;
}
file_logger.reset(Logger::create_file(logfile));
if (!file_logger) {
logger->out(Logger::ERR, "Unable to open %s for logging: %s",
logfile, strerror(errno));
return EXIT_FAILURE;
}
}
io::auto_fd accept_socket(Proxy::setup_accept_socket(config.get(),
logger.get()));
if (!accept_socket) return EXIT_FAILURE;
io::auto_fd monitor_socket;
if (config->get("monitor", false)) {
monitor_socket.reset(Proxy::setup_monitor_socket(config.get(),
logger.get()));
}
auto foreground = config->get("foreground", false);
auto cwd = get_cwd();
std::unique_ptr<Looper> looper(Looper::create());
std::unique_ptr<Resolver> resolver(Resolver::create(looper.get()));
std::unique_ptr<Proxy> proxy(
Proxy::create(config.get(), cwd, configfile,
foreground ? "bogus" :
(logfile_from_argument ? logfile : nullptr),
foreground ? logger.get() : file_logger.get(),
accept_socket.release(),
monitor_socket.release(),
looper.get(), resolver.get()));
if (!foreground) {
if (daemon(0, 0)) {
logger->out(Logger::ERR, "Failed to fork: %s", strerror(errno));
return EXIT_FAILURE;
}
}
setup_signals(proxy.get());
return proxy->run() ? EXIT_SUCCESS : EXIT_FAILURE;
}
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