protocol.cpp

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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <rpc/protocol.h>

#include <random.h>
#include <tinyformat.h>
#include <util.h>
#include <utilstrencodings.h>
#include <utiltime.h>
#include <version.h>

#include <stdint.h>
#include <fstream>

UniValue JSONRPCRequestObj(const std::string& strMethod, const UniValue& params, const UniValue& id)
{
    UniValue request(UniValue::VOBJ);
    request.push_back(Pair("method", strMethod));
    request.push_back(Pair("params", params));
    request.push_back(Pair("id", id));
    return request;
}

UniValue JSONRPCReplyObj(const UniValue& result, const UniValue& error, const UniValue& id)
{
    UniValue reply(UniValue::VOBJ);
    if (!error.isNull())
        reply.push_back(Pair("result", NullUniValue));
    else
        reply.push_back(Pair("result", result));
    reply.push_back(Pair("error", error));
    reply.push_back(Pair("id", id));
    return reply;
}

std::string JSONRPCReply(const UniValue& result, const UniValue& error, const UniValue& id)
{
    UniValue reply = JSONRPCReplyObj(result, error, id);
    return reply.write() + "\n";
}

UniValue JSONRPCError(int code, const std::string& message)
{
    UniValue error(UniValue::VOBJ);
    error.push_back(Pair("code", code));
    error.push_back(Pair("message", message));
    return error;
}

static const std::string COOKIEAUTH_USER = "__cookie__";
static const std::string COOKIEAUTH_FILE = ".cookie";

static fs::path GetAuthCookieFile(bool temp=false)
{
    std::string arg = gArgs.GetArg("-rpccookiefile", COOKIEAUTH_FILE);
    if (temp) {
        arg += ".tmp";
    }
    fs::path path(arg);
    if (!path.is_complete()) path = GetDataDir() / path;
    return path;
}

bool GenerateAuthCookie(std::string *cookie_out)
{
    const size_t COOKIE_SIZE = 32;
    unsigned char rand_pwd[COOKIE_SIZE];
    GetRandBytes(rand_pwd, COOKIE_SIZE);
    std::string cookie = COOKIEAUTH_USER + ":" + HexStr(rand_pwd, rand_pwd+COOKIE_SIZE);

    std::ofstream file;
    fs::path filepath_tmp = GetAuthCookieFile(true);
    file.open(filepath_tmp.string().c_str());
    if (!file.is_open()) {
        LogPrintf("Unable to open cookie authentication file %s for writing\n", filepath_tmp.string());
        return false;
    }
    file << cookie;
    file.close();

    fs::path filepath = GetAuthCookieFile(false);
    if (!RenameOver(filepath_tmp, filepath)) {
        LogPrintf("Unable to rename cookie authentication file %s to %s\n", filepath_tmp.string(), filepath.string());
        return false;
    }
    LogPrintf("Generated RPC authentication cookie %s\n", filepath.string());

    if (cookie_out)
        *cookie_out = cookie;
    return true;
}

bool GetAuthCookie(std::string *cookie_out)
{
    std::ifstream file;
    std::string cookie;
    fs::path filepath = GetAuthCookieFile();
    file.open(filepath.string().c_str());
    if (!file.is_open())
        return false;
    std::getline(file, cookie);
    file.close();

    if (cookie_out)
        *cookie_out = cookie;
    return true;
}

void DeleteAuthCookie()
{
    try {
        fs::remove(GetAuthCookieFile());
    } catch (const fs::filesystem_error& e) {
        LogPrintf("%s: Unable to remove random auth cookie file: %s\n", __func__, e.what());
    }
}