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mcsrv
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presque login

This commit is contained in:
nemo 2025-01-27 19:24:42 +01:00
parent 4ee7f7a1e9
commit 710e7aece7
2 changed files with 169 additions and 30 deletions
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193
main.c
View File

@ -1,5 +1,6 @@
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@ -12,6 +13,10 @@
#define SEGMENT_BITS 0x7F
#define CONTINUE_BIT 0x80
#define UUID_STR_LEN (32 + 4)
#define sizeof_member(type, member) (sizeof( ((type *)0)->member ))
typedef uint8_t byte;
typedef struct MCString_view {
@ -19,9 +24,14 @@ typedef struct MCString_view {
unsigned char* str;
} MCString_view;
typedef struct MCUUID {
byte byte[16];
char str[UUID_STR_LEN];
} MCUUID;
typedef struct File {
int len;
char* data;
int len;
} File;
byte buffer[BUFFER_SIZE] = {0};
@ -64,9 +74,9 @@ byte read_byte(int client_fd)
if (bytes_received > 0) {
buffer[bytes_received] = '\0';
printf("[TCP] %ld bytes reçu :\n", bytes_received);
print_hex((const char*)buffer, bytes_received);
print_hex((const char*)buffer, bytes_received > 20 ? 20 : bytes_received);
// print_str(buffer, bytes_received);
printf("\n[TCP] fin %ld bytes\n", bytes_received);
printf("%s\n[TCP] fin %ld bytes\n", bytes_received > 20 ? "..." : "", bytes_received);
}
else if (bytes_received < 0) {
perror("[ERR] Erreur lors de la réception des données");
@ -108,6 +118,47 @@ MCString_view read_String_view(int client_fd)
return str;
}
char byte_to_char(byte b)
{
return b >= 10 ? b-10 + 'a' : b + '0';
}
MCUUID read_UUID(int client_fd)
{
MCUUID uuid = {0};
int c = 0;
for (int i = 0; i < 4; i++) {
uuid.byte[i] = read_byte(client_fd);
uuid.str[c++] = byte_to_char(uuid.byte[i] >> 4);
uuid.str[c++] = byte_to_char((uint8_t)(uuid.byte[i] << 4) >> 4);
}
uuid.str[c++] = '-';
for (int i = 4; i < 6; i++) {
uuid.byte[i] = read_byte(client_fd);
uuid.str[c++] = byte_to_char(uuid.byte[i] >> 4);
uuid.str[c++] = byte_to_char((uint8_t)(uuid.byte[i] << 4) >> 4);
}
uuid.str[c++] = '-';
for (int i = 6; i < 8; i++) {
uuid.byte[i] = read_byte(client_fd);
uuid.str[c++] = byte_to_char(uuid.byte[i] >> 4);
uuid.str[c++] = byte_to_char((uint8_t)(uuid.byte[i] << 4) >> 4);
}
uuid.str[c++] = '-';
for (int i = 8; i < 10; i++) {
uuid.byte[i] = read_byte(client_fd);
uuid.str[c++] = byte_to_char(uuid.byte[i] >> 4);
uuid.str[c++] = byte_to_char((uint8_t)(uuid.byte[i] << 4) >> 4);
}
uuid.str[c++] = '-';
for (int i = 10; i < 16; i++) {
uuid.byte[i] = read_byte(client_fd);
uuid.str[c++] = byte_to_char(uuid.byte[i] >> 4);
uuid.str[c++] = byte_to_char((uint8_t)(uuid.byte[i] << 4) >> 4);
}
return uuid;
}
uint16_t read_UShort(int client_fd)
{
uint8_t var1 = read_byte(client_fd);
@ -123,6 +174,18 @@ void write_byte(int client_fd, int value)
request[req_current_byte++] = value;
}
void write_UUID(int client_fd, MCUUID value)
{
for (int i = 0; i < (int) sizeof_member(MCUUID, byte); i++) {
write_byte(client_fd, value.byte[i]);
}
}
void write_Boolean(int client_fd, bool value)
{
write_byte(client_fd, value);
}
void write_VarInt(int client_fd, int value)
{
while (true) {
@ -159,7 +222,7 @@ void send_request(int client_fd)
printf("[INFO] %d byte request sent: ", req_current_byte);
print_hex((const char*) request, req_current_byte > 10 ? 10 : req_current_byte);
printf("...\n");
printf("%s\n", req_current_byte > 10 ? "..." : "");
req_current_byte = 0;
}
@ -181,11 +244,94 @@ File read_entire_file(const char *filename)
};
}
void write_entire_file(const char *filename, File file)
{
FILE *f = fopen(filename, "w");
fwrite(file.data, file.len, 1, f);
fclose(f);
}
void file_free(File file)
{
free(file.data);
}
void status_protocol(int client_fd)
{
File status_rep = read_entire_file("status_response.json");
// TODO: get VarInt byte size from int, for /*str len*/
write_VarInt(client_fd, 1 /*packet id*/ + 2 /*str len*/ + status_rep.len); // packet length
write_VarInt(client_fd, 0);
write_String(client_fd, status_rep.data, status_rep.len);
send_request(client_fd);
printf("\n[STEP] Ping Status\n");
file_free(status_rep);
int request_status_len = read_VarInt(client_fd);
int request_status_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", request_status_id, request_status_len);
if (request_status_id != 0 || request_status_len != 1) {
printf("[ERR] client not in the status state\n");
close_connection(client_fd);
return;
}
write_VarInt(client_fd, 1 /*packet id*/ + 8 /*Long len*/);
write_VarInt(client_fd, 1); // protocol id
write_Long(client_fd, (long)time(NULL));
send_request(client_fd);
printf("\n[STEP] Switch To Login Start\n");
int login_len = read_VarInt(client_fd);
int login_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", login_id, login_len);
printf("[NOTE] je ne sais pas a quoi sert cet requete du client\n");
close_connection(client_fd);
}
void login_protocol(int client_fd)
{
printf("\n[STEP] Login Start\n");
int request_len = read_VarInt(client_fd);
int request_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", request_id, request_len);
MCString_view pseudo = read_String_view(client_fd);
// NOTE: le client envoie l'uuid a la fin de la requete et je n'ai aucune
// idée de ce qu'il envoie entre le pseudo et l'uuid
current_byte = bytes_received - sizeof_member(MCUUID, byte);
MCUUID uuid = read_UUID(client_fd);
printf("[INFO] player pseudo = %.*s\n", pseudo.len, pseudo.str);
printf("[INFO] player UUID = %.*s\n", UUID_STR_LEN, uuid.str);
printf("\n[STEP] Login Success / Acknowledge\n");
write_VarInt(client_fd, 1 /*id*/ + 16 /*uuid*/ + pseudo.len + 2 /*list len & bool*/);
write_VarInt(client_fd, 2);
write_UUID(client_fd, uuid);
write_String(client_fd, (char*)pseudo.str, pseudo.len);
write_VarInt(client_fd, 0); // len list de property
// write_Boolean(client_fd, true);
write_entire_file("debug.hex", (File){(char*)request, req_current_byte});
send_request(client_fd);
request_len = read_VarInt(client_fd);
request_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", request_id, request_len);
close_connection(client_fd);
}
int main()
{
int server_fd, client_fd;
@ -232,6 +378,8 @@ int main()
printf("[TCP] connection %s:%d\n",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
printf("\n[STEP] Handshake / List Ping\n");
int packet_length = read_VarInt(client_fd);
int packet_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", packet_id, packet_length);
@ -252,33 +400,22 @@ int main()
int next_state = read_VarInt(client_fd);
printf("[INFO] next state: %d\n", next_state);
File status_rep = read_entire_file("status_response.json");
// TODO: get VarInt byte size from int, for /*str len*/
write_VarInt(client_fd, 1 /*packet id*/ + 2 /*str len*/ + status_rep.len); // packet length
write_VarInt(client_fd, packet_id);
write_String(client_fd, status_rep.data, status_rep.len);
send_request(client_fd);
file_free(status_rep);
int request_status_len = read_VarInt(client_fd);
int request_status_id = read_VarInt(client_fd);
printf("[MCPACKET %d] packet length: %d\n", request_status_id, request_status_len);
if (request_status_id != 0 || request_status_len != 1) {
printf("[ERR] client not in the status state\n");
switch (next_state) {
case 1: // status
status_protocol(client_fd);
break;
case 2: // login
login_protocol(client_fd);
break;
case 3: // transfer
printf("[TODO] transfer protocol not programmed\n");
close_connection(client_fd);
break;
default:
printf("[ERR] state n°%d not supported\n", next_state);
close_connection(client_fd);
continue;
}
write_VarInt(client_fd, 1 /*packet id*/ + 8 /*Long len*/);
write_VarInt(client_fd, 1); // protocol id
write_Long(client_fd, (long)time(NULL));
send_request(client_fd);
close_connection(client_fd);
}
// Fermeture de la socket du serveur

6
status_response.json
View File

@ -4,10 +4,12 @@
"protocol": 760
},
"players": {
"max": 100,
"online": 1,
"max": 20,
"online": 2,
"sample": [
{
"id": "4566e69f-c907-48ee-8d71-d7ba5aa00d20",
"name": "thinkofdeath",
"name": "Le caca est cuit ?",
"id": "83e2e372-1df3-485d-a360-d9c4caf8b8c4"
}