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#include <string.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include "mctypes.h"
int main(int argc, char *argv[])
{
char *port_s, *address;
unsigned short port;
size_t p_size, v_size;
unsigned char *raw_handshake, *raw_packet;
varint packet_id;
int protocol_ver;
int p_flag = 0;
if (argc == 1) {
printf
("Usage: mcping ADDRESS[:PORT]\nPings a Minecraft server using the PING protocol.\n\n -h\tdisplay this help and exit\n -p [PROTOCOL NUMBER]\tUses specified protocol number.");
exit(EXIT_SUCCESS);
}
int opt;
while ((opt = getopt(argc, argv, "hp:")) != -1) {
switch (opt) {
case 'h':
exit(EXIT_SUCCESS);
case 'p':
protocol_ver = atoi(optarg);
p_flag = 1;
break;
default:
break;
}
}
address = argv[1];
if ((port_s = strchr(address, ':')) != NULL) {
address[strlen(address) - strlen(port_s)] = '\0';
port_s++;
} else
port_s = "25565";
if (p_flag == 0) {
protocol_ver = 756;
}
port = atoi(port_s);
int s;
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror("bad socket\n");
struct addrinfo *mc_info = malloc(sizeof(struct addrinfo));
memset(mc_info, 0, sizeof(struct addrinfo));
struct addrinfo hints;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (getaddrinfo(address, "80", &hints, &mc_info) != 0)
perror("bad addrinfo\n");
struct sockaddr_in mc_sock;
mc_sock.sin_family = AF_INET;
mc_sock.sin_port = htons(port);
memcpy(&mc_sock.sin_addr, mc_info->ai_addr->sa_data + 2, mc_info->ai_addrlen); // stupidity
if (connect(s, (struct sockaddr *) &mc_sock, sizeof(mc_sock)) < 0)
perror("connection failed\n");
handshake hs = {
to_varint(protocol_ver),
{to_varint(strlen(address)), address},
port,
to_varint(1)
};
size_t handshake_size = serialize_handshake(hs, (void**)&raw_handshake);
// printf("%lu\n", hs_size);
printf(" ");
for (int i = 0; i < handshake_size; ++i) {
printf("%02X ", raw_handshake[i]);
}
printf("\n");
packet_id = to_varint(0x00);
for (v_size = 1; (packet_id[v_size - 1] & 0x80) != 0; v_size++);
packet handshake_packet = {
to_varint(handshake_size + v_size),
packet_id,
(void*) raw_handshake
};
p_size = serialize_packet(handshake_packet, (void**)&raw_packet);
for (int i = 0; i < p_size; ++i) {
printf("%02X ", raw_packet[i]);
}
printf("\n");
for (v_size = 1; (packet_id[v_size - 1] & 0x80) != 0; v_size++);
packet request_packet = {
to_varint(len_varint(to_varint(0x0))),
to_varint(0x0),
NULL
};
p_size = serialize_packet(request_packet, (void**)&raw_packet);
return 0;
}
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