mirror of
https://github.com/oxen-io/lokinet
synced 2023-12-14 06:53:00 +01:00
364 lines
8.4 KiB
C++
364 lines
8.4 KiB
C++
#include <router_contact.hpp>
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#include <constants/version.hpp>
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#include <crypto/crypto.hpp>
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#include <net/net.hpp>
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#include <util/bencode.hpp>
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#include <util/buffer.hpp>
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#include <util/logger.hpp>
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#include <util/mem.hpp>
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#include <util/time.hpp>
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#include <fstream>
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namespace llarp
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{
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NetID &
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NetID::DefaultValue()
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{
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static NetID defaultID(
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reinterpret_cast< const byte_t * >(Version::LLARP_NET_ID));
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return defaultID;
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}
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bool RouterContact::IgnoreBogons = false;
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#ifdef TESTNET
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// 1 minute for testnet
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llarp_time_t RouterContact::Lifetime = 60 * 1000;
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#else
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/// 1 day for real network
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llarp_time_t RouterContact::Lifetime = 24 * 60 * 60 * 1000;
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#endif
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NetID::NetID(const byte_t *val) : AlignedBuffer< 8 >()
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{
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size_t len = strnlen(reinterpret_cast< const char * >(val), size());
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std::copy(val, val + len, begin());
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}
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NetID::NetID() : NetID(DefaultValue().data())
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{
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}
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bool
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NetID::operator==(const NetID &other) const
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{
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return ToString() == other.ToString();
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}
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std::string
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NetID::ToString() const
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{
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auto term = std::find(begin(), end(), '\0');
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return std::string(begin(), term);
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}
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bool
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NetID::BDecode(llarp_buffer_t *buf)
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{
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Zero();
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llarp_buffer_t strbuf;
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if(!bencode_read_string(buf, &strbuf))
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return false;
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if(strbuf.sz > size())
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return false;
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std::copy(strbuf.base, strbuf.base + strbuf.sz, begin());
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return true;
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}
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bool
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NetID::BEncode(llarp_buffer_t *buf) const
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{
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auto term = std::find(begin(), end(), '\0');
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return bencode_write_bytestring(buf, begin(), std::distance(begin(), term));
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}
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bool
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RouterContact::BEncode(llarp_buffer_t *buf) const
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{
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/* write dict begin */
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if(!bencode_start_dict(buf))
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return false;
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/* write ai if they exist */
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if(!bencode_write_bytestring(buf, "a", 1))
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return false;
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if(!BEncodeWriteList(addrs.begin(), addrs.end(), buf))
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return false;
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/* write netid */
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if(!bencode_write_bytestring(buf, "i", 1))
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return false;
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if(!netID.BEncode(buf))
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return false;
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/* write signing pubkey */
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if(!bencode_write_bytestring(buf, "k", 1))
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return false;
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if(!pubkey.BEncode(buf))
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return false;
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std::string nick = Nick();
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if(nick.size())
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{
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/* write nickname */
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if(!bencode_write_bytestring(buf, "n", 1))
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return false;
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if(!bencode_write_bytestring(buf, nick.c_str(), nick.size()))
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return false;
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}
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/* write encryption pubkey */
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if(!bencode_write_bytestring(buf, "p", 1))
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return false;
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if(!enckey.BEncode(buf))
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return false;
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/* write last updated */
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if(!bencode_write_bytestring(buf, "u", 1))
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return false;
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if(!bencode_write_uint64(buf, last_updated))
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return false;
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/* write version */
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if(!bencode_write_version_entry(buf))
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return false;
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/* write xi if they exist */
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if(!bencode_write_bytestring(buf, "x", 1))
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return false;
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if(!BEncodeWriteList(exits.begin(), exits.end(), buf))
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return false;
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/* write signature */
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if(!bencode_write_bytestring(buf, "z", 1))
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return false;
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if(!signature.BEncode(buf))
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return false;
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return bencode_end(buf);
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}
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void
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RouterContact::Clear()
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{
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addrs.clear();
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exits.clear();
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signature.Zero();
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nickname.Zero();
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enckey.Zero();
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pubkey.Zero();
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last_updated = 0;
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}
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bool
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RouterContact::DecodeKey(llarp_buffer_t key, llarp_buffer_t *buf)
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{
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bool read = false;
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if(!BEncodeMaybeReadDictList("a", addrs, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictEntry("i", netID, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictEntry("k", pubkey, read, key, buf))
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return false;
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if(llarp_buffer_eq(key, "n"))
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{
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llarp_buffer_t strbuf;
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if(!bencode_read_string(buf, &strbuf))
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return false;
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if(strbuf.sz > nickname.size())
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return false;
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nickname.Zero();
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std::copy(strbuf.base, strbuf.base + strbuf.sz, nickname.begin());
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return true;
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}
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if(!BEncodeMaybeReadDictEntry("p", enckey, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictInt("u", last_updated, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictInt("v", version, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictList("x", exits, read, key, buf))
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return false;
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if(!BEncodeMaybeReadDictEntry("z", signature, read, key, buf))
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return false;
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return read;
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}
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bool
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RouterContact::IsPublicRouter() const
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{
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return addrs.size() > 0;
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}
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bool
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RouterContact::HasNick() const
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{
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return nickname[0] != 0;
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}
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void
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RouterContact::SetNick(const std::string &nick)
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{
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nickname.Zero();
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std::copy(nick.begin(),
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nick.begin() + std::min(nick.size(), nickname.size()),
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nickname.begin());
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}
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bool
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RouterContact::IsExpired(llarp_time_t now) const
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{
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auto expiresAt = last_updated + Lifetime;
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return now >= expiresAt;
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}
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bool
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RouterContact::ExpiresSoon(llarp_time_t now, llarp_time_t dlt) const
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{
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if(IsExpired(now))
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{
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return true;
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}
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auto expiresAt = last_updated + Lifetime;
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return expiresAt - now <= dlt;
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}
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std::string
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RouterContact::Nick() const
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{
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auto term = std::find(nickname.begin(), nickname.end(), '\0');
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return std::string(nickname.begin(), term);
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}
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bool
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RouterContact::Sign(llarp::Crypto *crypto, const SecretKey &secretkey)
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{
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pubkey = llarp::seckey_topublic(secretkey);
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byte_t tmp[MAX_RC_SIZE] = {0};
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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signature.Zero();
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last_updated = time_now_ms();
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if(!BEncode(&buf))
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return false;
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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return crypto->sign(signature, secretkey, buf);
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}
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bool
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RouterContact::Verify(llarp::Crypto *crypto, llarp_time_t now) const
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{
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if(netID != NetID::DefaultValue())
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{
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llarp::LogError("netid missmatch: '", netID, "' != '",
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NetID::DefaultValue(), "'");
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return false;
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}
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if(IsExpired(now))
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{
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llarp::LogError("RC is expired");
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return false;
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}
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for(const auto &a : addrs)
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{
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if(IsBogon(a.ip) && !IgnoreBogons)
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{
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llarp::LogError("invalid address info: ", a);
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return false;
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}
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}
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for(const auto &exit : exits)
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{
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if(IsBogonRange(exit.address, exit.netmask))
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return false;
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}
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if(!VerifySignature(crypto))
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{
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llarp::LogError("invalid signature");
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return false;
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}
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return true;
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}
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bool
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RouterContact::VerifySignature(llarp::Crypto *crypto) const
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{
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RouterContact copy;
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copy = *this;
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copy.signature.Zero();
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byte_t tmp[MAX_RC_SIZE] = {0};
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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if(!copy.BEncode(&buf))
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{
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llarp::LogError("bencode failed");
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return false;
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}
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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return crypto->verify(pubkey, buf, signature);
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}
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bool
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RouterContact::Write(const char *fname) const
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{
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byte_t tmp[MAX_RC_SIZE] = {0};
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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if(!BEncode(&buf))
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return false;
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buf.sz = buf.cur - buf.base;
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buf.cur = buf.base;
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std::ofstream f; // why was this in its own scope?
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f.open(fname, std::ios::binary);
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if(!f.is_open())
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return false;
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f.write((char *)buf.base, buf.sz);
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return true;
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}
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bool
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RouterContact::Read(const char *fname)
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{
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byte_t tmp[MAX_RC_SIZE] = {0};
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std::ifstream f;
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f.open(fname, std::ios::binary);
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if(!f.is_open())
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{
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llarp::LogError("Failed to open ", fname);
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return false;
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}
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f.seekg(0, std::ios::end);
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auto l = f.tellg();
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if(l > sizeof(tmp))
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return false;
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f.seekg(0, std::ios::beg);
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f.read((char *)tmp, l);
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auto buf = llarp::StackBuffer< decltype(tmp) >(tmp);
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return BDecode(&buf);
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}
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RouterContact &
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RouterContact::operator=(const RouterContact &other)
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{
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addrs = other.addrs;
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exits = other.exits;
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signature = other.signature;
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last_updated = other.last_updated;
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enckey = other.enckey;
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pubkey = other.pubkey;
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nickname = other.nickname;
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version = other.version;
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netID = other.netID;
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return *this;
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}
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} // namespace llarp
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