lolautoaccept/src/clientaccess.cpp

#include "clientaccess.h"

#include <cstring>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>

#include <algorithm>
#include <fstream>
#include <iomanip>
#include <string>
#include <vector>

#include <Log.h>

#include "defer.h"

static bool endsWith(const std::string& all, const std::string& end) {
	return all.rfind(end) == all.size() - end.size();
}

// reads a procfile into a vector (strings are \0 seperated)
static std::vector<std::string> readProcFile(const std::string& path) {
	std::ifstream in(path);
	std::vector<std::string> out;
	std::string line;
	while(std::getline(in, line, '\0')) {
		if(!line.empty()) {
			out.push_back(line);
		}
	}
	return out;
}

ClientAccess::ClientAccess() {}

ClientAccess::ClientAccess(const std::string& token, uint16_t port) : authcode(token), port(port) {}

std::shared_ptr<ClientAccess> ClientAccess::find(bool uselockfile) {

	DIR* procdir = opendir("/proc");
	if(!procdir) return nullptr;

	defer( closedir(procdir) );

	dirent* entry = nullptr;
	while ((entry = readdir(procdir)) != NULL) {
		if (entry->d_type != DT_DIR) continue;

		std::string name(entry->d_name);

		pid_t pid = -1;
		try {
			pid = std::stoi(name);
		} catch(std::exception& e) {
			// could not parse -> not a pid
			continue;
		}

		// get info on the exe
		std::string cmdfile = "/proc/" + std::to_string(pid) + "/cmdline";
		std::vector<std::string> args = readProcFile(cmdfile);

		// Log::debug << "process: " << pid << " has " << args.size() << " args";

		if(args.empty()) continue;

		std::string& exename = args.at(0);
		if(endsWith(exename, "LeagueClientUx.exe")) {
			Log::info << "LeagueClientUx.exe found";

			std::shared_ptr<ClientAccess> out;

			if(uselockfile) {
				out = findUsingLockfile(args, pid);
			} else {
				out = findUsingArgs(args);
			}

			if(out) {
				return out;
			}
		}
	}

	return nullptr;
}

std::string ClientAccess::parseArg(const std::string& input, std::string& value) {
	if(input.find("--") != 0) return {};

	size_t pos = input.find('=');
	if(pos == std::string::npos) return {};

	value = input.substr(pos+1);
	return input.substr(2, pos-2);
}

std::shared_ptr<ClientAccess> ClientAccess::findUsingArgs(const std::vector<std::string>& cmdline) {
	// parse args
	std::shared_ptr<ClientAccess> access(new ClientAccess());
	for(const std::string& arg : cmdline) {
		std::string value;
		std::string argname = parseArg(arg, value);

		if(argname == "riotclient-auth-token") {
			access->authcode = value;
		} else if(argname == "riotclient-app-port") {
			try {
				access->port = std::stoi(value);
			} catch(std::exception& e) {
				Log::warn << "could not parse port: " << std::quoted(value);
			}
		}
	}

	if(access->port > 0 && !access->authcode.empty()) {
		return access;
	}
	return nullptr;
}

std::shared_ptr<ClientAccess> ClientAccess::findUsingLockfile(const std::vector<std::string>& cmdline, pid_t pid) {
	// get WINEPREFIX env
	std::vector<std::string> envs = readProcFile("/proc/" + std::to_string(pid) + "/environ");

	const static std::string WINEPREFIX = "WINEPREFIX=";

	// find WINEPREFIX
	auto found = std::find_if(envs.begin(), envs.end(), [](const std::string& s) {
		return s.find(WINEPREFIX) == 0;
	});

	// WINEPREFIX env not present
	if(found == envs.end()) {
		Log::debug << "WINEPREFIX environment variable not set";
		return {};
	}

	const std::string wineprefix = found->substr(WINEPREFIX.size());
	const std::string binarypath = cmdline.at(0);
	std::string gamefolder = binarypath.substr(2, binarypath.rfind('/')-1); // remove the "C:" and the name of the binary
	// TODO: gamefoldre could contain '\' so replacing every occurance with '/' would be a good idea
	const std::string lockfilepath = wineprefix + "/drive_c/" + gamefolder + "/lockfile";

	Log::debug << "lockfilepath: " << std::quoted(lockfilepath);

	// read lockfile
	std::ifstream lockfile(lockfilepath);
	std::vector<std::string> parts;
	std::string content;
	while(std::getline(lockfile, content, ':')) {
		parts.push_back(content);
	}

	if(parts.size() != 5) {
		Log::error << "lockfile contained " << parts.size() << " parts, expected 5";
		return {};
	}

	const std::string portstr = parts.at(2);
	const std::string token = parts.at(3);

	// try to parse port
	try {
		uint16_t port = std::stoi(portstr);

		return std::shared_ptr<ClientAccess>(new ClientAccess(token, port));
	} catch(std::exception& e) {
		Log::error << "could not parse port: " << std::quoted(portstr);
	}

	return {};
}

std::string ClientAccess::getBasicAuth() const {
	return "riot:" + authcode;
}

uint16_t ClientAccess::getPort() const {
	return port;
}

std::string ClientAccess::getURL() const {
	return "https://127.0.0.1:" + std::to_string(port) + "/";
}