mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
424 lines
9.1 KiB
C++
424 lines
9.1 KiB
C++
#include <llarp/crypto_async.h>
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#include <llarp/nodedb.hpp>
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#include <llarp/router_contact.hpp>
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#include <fstream>
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#include <llarp/crypto.hpp>
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#include <unordered_map>
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#include "buffer.hpp"
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#include "encode.hpp"
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#include "fs.hpp"
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#include "logger.hpp"
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#include "mem.hpp"
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static const char skiplist_subdirs[] = "0123456789abcdef";
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static const std::string RC_FILE_EXT = ".signed";
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struct llarp_nodedb
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{
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llarp_nodedb(llarp_crypto *c) : crypto(c)
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{
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}
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llarp_crypto *crypto;
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// std::map< llarp::pubkey, llarp_rc > entries;
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llarp::util::Mutex access;
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std::unordered_map< llarp::PubKey, llarp::RouterContact, llarp::PubKey::Hash >
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entries;
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fs::path nodePath;
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void
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Clear()
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{
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llarp::util::Lock lock(access);
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entries.clear();
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}
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bool
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Get(const llarp::PubKey &pk, llarp::RouterContact &result)
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{
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llarp::util::Lock lock(access);
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auto itr = entries.find(pk);
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if(itr == entries.end())
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return false;
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result = itr->second;
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return true;
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}
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bool
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Has(const llarp::PubKey &pk)
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{
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llarp::util::Lock lock(access);
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return entries.find(pk) != entries.end();
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}
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std::string
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getRCFilePath(const byte_t *pubkey) const
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{
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char ftmp[68] = {0};
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const char *hexname =
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llarp::HexEncode< llarp::PubKey, decltype(ftmp) >(pubkey, ftmp);
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std::string hexString(hexname);
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std::string skiplistDir;
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skiplistDir += hexString[hexString.length() - 1];
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hexString += RC_FILE_EXT;
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fs::path filepath = nodePath / skiplistDir / hexString;
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return filepath.string();
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}
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/// insert and write to disk
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bool
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Insert(const llarp::RouterContact &rc)
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{
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byte_t tmp[MAX_RC_SIZE];
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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{
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llarp::util::Lock lock(access);
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entries.insert(std::make_pair(rc.pubkey, rc));
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}
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if(!rc.BEncode(&buf))
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return false;
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buf.sz = buf.cur - buf.base;
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auto filepath = getRCFilePath(rc.pubkey);
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llarp::LogDebug("saving RC.pubkey ", filepath);
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std::ofstream ofs(
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filepath,
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std::ofstream::out & std::ofstream::binary & std::ofstream::trunc);
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ofs.write((char *)buf.base, buf.sz);
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ofs.close();
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if(!ofs)
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{
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llarp::LogError("Failed to write: ", filepath);
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return false;
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}
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llarp::LogDebug("saved RC.pubkey: ", filepath);
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return true;
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}
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ssize_t
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Load(const fs::path &path)
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{
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std::error_code ec;
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if(!fs::exists(path, ec))
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{
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return -1;
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}
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ssize_t loaded = 0;
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for(const char &ch : skiplist_subdirs)
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{
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if(!ch)
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continue;
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std::string p;
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p += ch;
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fs::path sub = path / p;
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ssize_t l = loadSubdir(sub);
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if(l > 0)
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loaded += l;
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}
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return loaded;
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}
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ssize_t
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loadSubdir(const fs::path &dir)
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{
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ssize_t sz = 0;
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llarp::util::IterDir(dir, [&](const fs::path &f) -> bool {
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if(fs::is_regular_file(f) && loadfile(f))
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sz++;
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return true;
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});
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return sz;
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}
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bool
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loadfile(const fs::path &fpath)
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{
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if(fpath.extension() != RC_FILE_EXT)
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return false;
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llarp::RouterContact rc;
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if(!rc.Read(fpath.string().c_str()))
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{
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llarp::LogError("failed to read file ", fpath);
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return false;
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}
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if(!rc.VerifySignature(crypto))
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{
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llarp::LogError("Signature verify failed", fpath);
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return false;
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}
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{
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llarp::util::Lock lock(access);
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entries.insert(std::make_pair(rc.pubkey, rc));
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}
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return true;
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}
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bool
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iterate(struct llarp_nodedb_iter i)
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{
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i.index = 0;
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llarp::util::Lock lock(access);
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auto itr = entries.begin();
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while(itr != entries.end())
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{
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i.rc = &itr->second;
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i.visit(&i);
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// advance
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i.index++;
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itr++;
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}
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return true;
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}
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/*
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bool Save()
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{
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auto itr = entries.begin();
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while(itr != entries.end())
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{
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llarp::pubkey pk = itr->first;
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llarp_rc *rc= itr->second;
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itr++; // advance
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}
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return true;
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}
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*/
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};
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// call request hook
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void
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logic_threadworker_callback(void *user)
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{
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llarp_async_verify_rc *verify_request =
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static_cast< llarp_async_verify_rc * >(user);
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verify_request->hook(verify_request);
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}
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// write it to disk
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void
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disk_threadworker_setRC(void *user)
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{
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llarp_async_verify_rc *verify_request =
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static_cast< llarp_async_verify_rc * >(user);
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verify_request->valid = verify_request->nodedb->Insert(verify_request->rc);
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if(verify_request->logic)
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llarp_logic_queue_job(verify_request->logic,
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{verify_request, &logic_threadworker_callback});
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}
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// we run the crypto verify in the crypto threadpool worker
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void
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crypto_threadworker_verifyrc(void *user)
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{
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llarp_async_verify_rc *verify_request =
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static_cast< llarp_async_verify_rc * >(user);
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llarp::RouterContact rc = verify_request->rc;
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verify_request->valid = rc.VerifySignature(verify_request->nodedb->crypto);
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// if it's valid we need to set it
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if(verify_request->valid && rc.IsPublicRouter())
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{
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llarp::LogDebug("RC is valid, saving to disk");
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llarp_threadpool_queue_job(verify_request->diskworker,
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{verify_request, &disk_threadworker_setRC});
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}
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else
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{
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// callback to logic thread
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if(!verify_request->valid)
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llarp::LogWarn("RC is not valid, can't save to disk");
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llarp_logic_queue_job(verify_request->logic,
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{verify_request, &logic_threadworker_callback});
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}
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}
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void
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nodedb_inform_load_rc(void *user)
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{
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llarp_async_load_rc *job = static_cast< llarp_async_load_rc * >(user);
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job->hook(job);
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}
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void
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nodedb_async_load_rc(void *user)
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{
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llarp_async_load_rc *job = static_cast< llarp_async_load_rc * >(user);
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auto fpath = job->nodedb->getRCFilePath(job->pubkey);
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job->loaded = job->nodedb->loadfile(fpath);
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if(job->loaded)
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{
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job->nodedb->Get(job->pubkey, job->result);
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}
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llarp_logic_queue_job(job->logic, {job, &nodedb_inform_load_rc});
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}
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struct llarp_nodedb *
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llarp_nodedb_new(struct llarp_crypto *crypto)
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{
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return new llarp_nodedb(crypto);
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}
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void
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llarp_nodedb_free(struct llarp_nodedb **n)
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{
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if(*n)
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{
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auto i = *n;
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*n = nullptr;
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i->Clear();
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delete i;
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}
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}
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bool
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llarp_nodedb_put_rc(struct llarp_nodedb *n, const llarp::RouterContact &rc)
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{
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return n->Insert(rc);
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}
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bool
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llarp_nodedb_ensure_dir(const char *dir)
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{
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fs::path path(dir);
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std::error_code ec;
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if(!fs::exists(dir, ec))
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fs::create_directories(path, ec);
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if(ec)
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return false;
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if(!fs::is_directory(path))
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return false;
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for(const char &ch : skiplist_subdirs)
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{
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// this seems to be a problem on all targets
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// perhaps cpp17::fs is just as screwed-up
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// attempting to create a folder with no name
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if(!ch)
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return true;
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std::string p;
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p += ch;
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fs::path sub = path / p;
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fs::create_directory(sub, ec);
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if(ec)
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return false;
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}
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return true;
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}
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void
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llarp_nodedb_set_dir(struct llarp_nodedb *n, const char *dir)
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{
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n->nodePath = dir;
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}
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ssize_t
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llarp_nodedb_load_dir(struct llarp_nodedb *n, const char *dir)
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{
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std::error_code ec;
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if(!fs::exists(dir, ec))
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{
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return -1;
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}
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llarp_nodedb_set_dir(n, dir);
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return n->Load(dir);
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}
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int
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llarp_nodedb_iterate_all(struct llarp_nodedb *n, struct llarp_nodedb_iter i)
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{
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n->iterate(i);
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return n->entries.size();
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}
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/// maybe rename to verify_and_set
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void
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llarp_nodedb_async_verify(struct llarp_async_verify_rc *job)
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{
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// switch to crypto threadpool and continue with
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// crypto_threadworker_verifyrc
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llarp_threadpool_queue_job(job->cryptoworker,
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{job, &crypto_threadworker_verifyrc});
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}
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// disabled for now
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/*
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void
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llarp_nodedb_async_load_rc(struct llarp_async_load_rc *job)
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{
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// call in the disk io thread so we don't bog down the others
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llarp_threadpool_queue_job(job->diskworker, {job, &nodedb_async_load_rc});
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}
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*/
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bool
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llarp_nodedb_get_rc(struct llarp_nodedb *n, const llarp::RouterID &pk,
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llarp::RouterContact &result)
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{
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// llarp::LogInfo("llarp_nodedb_get_rc [", pk, "]");
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return n->Get(pk, result);
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}
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size_t
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llarp_nodedb_num_loaded(struct llarp_nodedb *n)
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{
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return n->entries.size();
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}
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bool
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llarp_nodedb_select_random_hop(struct llarp_nodedb *n,
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const llarp::RouterContact &prev,
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llarp::RouterContact &result, size_t N)
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{
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/// checking for "guard" status for N = 0 is done by caller inside of
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/// pathbuilder's scope
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auto sz = n->entries.size();
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if(sz < 3)
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return false;
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size_t tries = 5;
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if(N)
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{
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do
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{
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auto itr = n->entries.begin();
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if(sz > 1)
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{
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auto idx = llarp_randint() % sz;
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if(idx)
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std::advance(itr, idx - 1);
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}
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if(prev.pubkey == itr->second.pubkey)
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{
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if(tries--)
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continue;
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return false;
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}
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if(itr->second.addrs.size())
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{
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result = itr->second;
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return true;
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}
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} while(tries--);
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return false;
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}
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else
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{
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auto itr = n->entries.begin();
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if(sz > 1)
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{
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auto idx = llarp_randint() % sz;
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if(idx)
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std::advance(itr, idx - 1);
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}
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result = itr->second;
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return true;
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}
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}
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