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implemented announce. finished

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mykola2312 2022-03-31 18:13:00 +03:00
parent 3a8c091da4
commit e271b38544
1 changed files with 67 additions and 9 deletions
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76
udptracker.c
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@ -42,17 +42,18 @@ struct announce_request_s {
uint16_t port;
} __attribute__((packed));
struct peer_s {
uint32_t ip_address;
uint16_t port;
} __attribute__((packed));
struct announce_response_s {
uint32_t action;
uint32_t transaction_id;
uint32_t interval;
uint32_t leechers;
uint32_t seeders;
} __attribute__((packed));
struct peer_s {
uint32_t ip_address;
uint16_t port;
struct peer_s peers[1];
} __attribute__((packed));
static void _sendto(int sockfd, const void* data, size_t size,
@ -79,11 +80,22 @@ static ssize_t _recvfrom(int sockfd, void* data, size_t size,
return read;
}
int htoi(char h)
{
return h < 0x3A ? h - 0x30 : h - 0x57;
}
void strhex(const char* str, uint8_t* out)
{
for (unsigned i = 0; i < strlen(str) >> 1; i++)
out[i] = htoi(str[i<<1]) << 4 | htoi(str[i<<1|1]);
}
int main(int argc, char** argv)
{
if (argc < 3)
if (argc < 4)
{
fprintf(stderr, "%s <host> <port>\n", argv[0]);
fprintf(stderr, "%s <host> <port> <hash>\n", argv[0]);
return 1;
}
@ -115,9 +127,10 @@ int main(int argc, char** argv)
srand(time(NULL));
uint64_t connection_id = INIT_CONNECTION_ID;
uint32_t transaction_id = rand();
printf("connect\ttransaction\t%u\n", transaction_id);
{
uint32_t transaction_id = rand();
printf("connect\ttransaction\t%u\n", transaction_id);
struct connect_request_s req = {
.connection_id = __bswap_64(INIT_CONNECTION_ID),
.action = __bswap_32(ACTION_CONNECT),
@ -136,6 +149,51 @@ int main(int argc, char** argv)
connection_id = res.connection_id;
}
{
uint32_t transaction_id = rand();
printf("announce\ttransaction\t%u\n", transaction_id);
struct announce_request_s req = {
.connection_id = __bswap_64(connection_id),
.action = __bswap_32(ACTION_ANNOUNCE),
.transaction_id = __bswap_32(transaction_id),
.downloaded = __bswap_64(0),
.left = __bswap_64(0),
.uploaded = __bswap_64(0),
.event = __bswap_32(0),
.ip_address = INADDR_LOOPBACK,
.key = __bswap_32(0),
.numwant = __bswap_32(ANNOUNCE_NUMWANT),
.port = htons(10126)
};
for (unsigned i = 0; i < 20; i++)
req.peer_id[i] = rand() & 0xFF;
strhex(argv[3], req.info_hash);
_sendto(sockfd, &req, sizeof(req), paddr, addrlen);
uint8_t* packet = (uint8_t*)malloc(65536);
struct announce_response_s* res = (struct announce_response_s*)packet;
_recvfrom(sockfd, res, 65536, paddr, &addrlen);
res->action = __bswap_32(res->action);
res->transaction_id = __bswap_32(res->transaction_id);
res->interval = __bswap_32(res->interval);
res->leechers = __bswap_32(res->leechers);
res->seeders = __bswap_32(res->seeders);
printf("%u\t%u\t%u\t%u\t%u\n", res->action, res->transaction_id,
res->interval, res->leechers, res->seeders);
unsigned count = res->leechers + res->seeders;
for (unsigned i = 0; i < count; i++)
{
struct peer_s* peer = &res->peers[i];
struct in_addr addr = {.s_addr = peer->ip_address};
unsigned port = ntohs(peer->port);
printf("%s\t%d\n", inet_ntoa(addr), port);
}
free(packet);
}
close(sockfd);
return 0;