void receive_block(const std::vector<unsigned char> hash, const std::shared_ptr<std::vector<unsigned char> >& block) {
if (connected != 2)
return;
{
std::lock_guard<std::mutex> lock(seen_mutex);
if (!blocksAlreadySeen.insert(hash).second)
return;
}
do_send_bytes(block);
}
void insert(int n)
{
mru.insert(n);
set.insert(n);
BOOST_CHECK(mru == set);
}
mrutester() { mru.max_size(MAX_SIZE); }
void net_process(const std::function<void(std::string)>& disconnect) {
while (true) {
struct bitcoin_msg_header header;
if (read_all((char*)&header, sizeof(header)) != sizeof(header))
return disconnect("failed to read message header");
if (header.magic != BITCOIN_MAGIC)
return disconnect("invalid magic bytes");
struct timeval start_read;
gettimeofday(&start_read, NULL);
header.length = le32toh(header.length);
if (header.length > 5000000)
return disconnect("got message too large");
auto msg = std::make_shared<std::vector<unsigned char> > (sizeof(struct bitcoin_msg_header) + uint32_t(header.length));
if (read_all((char*)&(*msg)[sizeof(struct bitcoin_msg_header)], header.length) != int(header.length))
return disconnect("failed to read message");
unsigned char fullhash[32];
double_sha256(&(*msg)[sizeof(struct bitcoin_msg_header)], fullhash, header.length);
if (memcmp((char*)fullhash, header.checksum, sizeof(header.checksum)))
return disconnect("got invalid message checksum");
if (!strncmp(header.command, "version", strlen("version"))) {
if (connected != 0)
return disconnect("got invalid version");
connected = 1;
if (header.length < sizeof(struct bitcoin_version_start))
return disconnect("got short version");
struct bitcoin_version_start *their_version = (struct bitcoin_version_start*) &(*msg)[sizeof(struct bitcoin_msg_header)];
printf("%s Protocol version %u\n", host.c_str(), le32toh(their_version->protocol_version));
struct bitcoin_version_with_header version_msg;
version_msg.version.start.timestamp = htole64(time(0));
memcpy(((char*)&version_msg.version.end.user_agent) + 27, location, 7);
static_assert(BITCOIN_UA_LENGTH == 27 + 7 + 2 /* 27 + 7 + '/' + '\0' */, "BITCOIN_UA changed in header but file not updated");
prepare_message("version", (unsigned char*)&version_msg, sizeof(struct bitcoin_version));
do_send_bytes((char*)&version_msg, sizeof(struct bitcoin_version_with_header));
struct bitcoin_msg_header verack_header;
prepare_message("verack", (unsigned char*)&verack_header, 0);
do_send_bytes((char*)&verack_header, sizeof(struct bitcoin_msg_header));
continue;
} else if (!strncmp(header.command, "verack", strlen("verack"))) {
if (connected != 1)
return disconnect("got invalid verack");
connected = 2;
continue;
}
if (connected != 2)
return disconnect("got non-version, non-verack before version+verack");
if (!strncmp(header.command, "ping", strlen("ping"))) {
memcpy(&header.command, "pong", sizeof("pong"));
memcpy(&(*msg)[0], &header, sizeof(struct bitcoin_msg_header));
do_send_bytes((char*)&(*msg)[0], sizeof(struct bitcoin_msg_header) + header.length);
continue;
} else if (!strncmp(header.command, "inv", strlen("inv"))) {
std::lock_guard<std::mutex> lock(seen_mutex);
try {
std::set<std::vector<unsigned char> > setRequestBlocks;
std::set<std::vector<unsigned char> > setRequestTxn;
std::vector<unsigned char>::const_iterator it = msg->begin();
it += sizeof(struct bitcoin_msg_header);
uint64_t count = read_varint(it, msg->end());
if (count > 50000)
return disconnect("inv count > MAX_INV_SZ");
uint32_t MSG_TX = htole32(1);
uint32_t MSG_BLOCK = htole32(2);
for (uint64_t i = 0; i < count; i++) {
move_forward(it, 4 + 32, msg->end());
std::vector<unsigned char> hash(it-32, it);
const uint32_t type = (*(it-(1+32)) << 24) | (*(it-(2+32)) << 16) | (*(it-(3+32)) << 8) | *(it-(4+32));
if (type == MSG_TX) {
if (!txnAlreadySeen.insert(hash).second)
continue;
setRequestTxn.insert(hash);
} else if (type == MSG_BLOCK) {
if (!blocksAlreadySeen.insert(hash).second)
continue;
setRequestBlocks.insert(hash);
} else
return disconnect("unknown inv type");
}
if (setRequestBlocks.size()) {
std::vector<unsigned char> getdataMsg;
std::vector<unsigned char> invCount = varint(setRequestBlocks.size());
getdataMsg.reserve(sizeof(struct bitcoin_msg_header) + invCount.size() + setRequestBlocks.size()*36);
getdataMsg.insert(getdataMsg.end(), sizeof(struct bitcoin_msg_header), 0);
getdataMsg.insert(getdataMsg.end(), invCount.begin(), invCount.end());
for (auto& hash : setRequestBlocks) {
getdataMsg.insert(getdataMsg.end(), (unsigned char*)&MSG_BLOCK, ((unsigned char*)&MSG_BLOCK) + 4);
getdataMsg.insert(getdataMsg.end(), hash.begin(), hash.end());
}
prepare_message("getdata", (unsigned char*)&getdataMsg[0], invCount.size() + setRequestBlocks.size()*36);
do_send_bytes((char*)&getdataMsg[0], sizeof(struct bitcoin_msg_header) + invCount.size() + setRequestBlocks.size()*36);
for (auto& hash : setRequestBlocks) {
struct timeval tv;
gettimeofday(&tv, NULL);
for (unsigned int i = 0; i < hash.size(); i++)
printf("%02x", hash[hash.size() - i - 1]);
printf(" requested from %s at %lu\n", host.c_str(), uint64_t(tv.tv_sec) * 1000 + uint64_t(tv.tv_usec) / 1000);
}
}
if (setRequestTxn.size()) {
std::vector<unsigned char> getdataMsg;
std::vector<unsigned char> invCount = varint(setRequestTxn.size());
getdataMsg.reserve(sizeof(struct bitcoin_msg_header) + invCount.size() + setRequestTxn.size()*36);
getdataMsg.insert(getdataMsg.end(), sizeof(struct bitcoin_msg_header), 0);
getdataMsg.insert(getdataMsg.end(), invCount.begin(), invCount.end());
for (const std::vector<unsigned char>& hash : setRequestTxn) {
getdataMsg.insert(getdataMsg.end(), (unsigned char*)&MSG_TX, ((unsigned char*)&MSG_TX) + 4);
getdataMsg.insert(getdataMsg.end(), hash.begin(), hash.end());
}
prepare_message("getdata", (unsigned char*)&getdataMsg[0], invCount.size() + setRequestTxn.size()*36);
do_send_bytes((char*)&getdataMsg[0], sizeof(struct bitcoin_msg_header) + invCount.size() + setRequestTxn.size()*36);
}
} catch (read_exception) {
return disconnect("failed to process inv");
}
continue;
}
memcpy(&(*msg)[0], &header, sizeof(struct bitcoin_msg_header));
if (!strncmp(header.command, "block", strlen("block"))) {
provide_block(this, msg, start_read);
} else if (!strncmp(header.command, "tx", strlen("tx"))) {
provide_transaction(this, msg);
}
}
}
