static void
send_version()
{
CBByteArray *ip = CBNewByteArrayWithDataCopy((uint8_t [16]){0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 127, 0, 0, 1}, 16);
CBByteArray *ua = CBNewByteArrayFromString("cmsc417versiona", '\00');
CBNetworkAddress * sourceAddr = CBNewNetworkAddress(0, ip, 0, CB_SERVICE_FULL_BLOCKS, false);
int32_t vers = 70001;
int nonce = rand();
CBVersion * version = CBNewVersion(vers, CB_SERVICE_FULL_BLOCKS, time(NULL), &peer->base, sourceAddr, nonce, ua, 0);
CBMessage *message = CBGetMessage(version);
char header[24];
memcpy(header + CB_MESSAGE_HEADER_TYPE, "version\0\0\0\0\0", 12);
/* Compute length, serialized, and checksum */
uint32_t len = CBVersionCalculateLength(version);
message->bytes = CBNewByteArrayOfSize(len);
len = CBVersionSerialise(version, false);
if (message->bytes) {
// Make checksum
uint8_t hash[32];
uint8_t hash2[32];
CBSha256(CBByteArrayGetData(message->bytes), message->bytes->length, hash);
CBSha256(hash, 32, hash2);
message->checksum[0] = hash2[0];
message->checksum[1] = hash2[1];
message->checksum[2] = hash2[2];
message->checksum[3] = hash2[3];
}
CBInt32ToArray(header, CB_MESSAGE_HEADER_NETWORK_ID, NETMAGIC);
CBInt32ToArray(header, CB_MESSAGE_HEADER_LENGTH, message->bytes->length);
// Checksum
memcpy(header + CB_MESSAGE_HEADER_CHECKSUM, message->checksum, 4);
// Send the header
send(sd, header, 24, 0);
// Send the message
printf("message len: %d\n", message->bytes->length);
printf("checksum: %x\n", *((uint32_t *) message->checksum));
send(sd, message->bytes->sharedData->data+message->bytes->offset, message->bytes->length, 0);
print_hex(message->bytes);
}
void BRSendVersion(BRConnection *c) {
/* current version number according to http://bitcoin.stackexchange.com/questions/13537/how-do-i-find-out-what-the-latest-protocol-version-is */
CBVersionServices services = CB_SERVICE_FULL_BLOCKS;
int64_t t = time(NULL);
CBNetworkAddress *r_addr = c->address;
CBNetworkAddress *s_addr = c->my_address;
uint64_t nonce = rand();
CBByteArray *ua = CBNewByteArrayFromString("br_cmsc417_v0.1", false);
int32_t block_height = 0; /* TODO get real number */
CBVersion *v = CBNewVersion(VERSION_NUM, services, t, r_addr, s_addr,
nonce, ua, block_height);
uint32_t length = CBVersionCalculateLength(v);
v->base.bytes = CBNewByteArrayOfSize(length);
CBVersionSerialise(v, false);
BRSendMessage(c, &v->base, "version");
/* don't release remote and local addresses just yet.
* need them for other messages */
CBReleaseObject(ua);
CBFreeVersion(v);
}