From c33c2a90d775837f23fc0fd482f13680881a7e5f Mon Sep 17 00:00:00 2001
From: sam <multisniperism@gmail.com>
Date: Mon, 21 Oct 2024 14:49:28 +1300
Subject: [PATCH] first commit

---
 .clang-format |  25 +++++++++
 .gitignore    |   8 +++
 src/main.c    | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++
 xmake.lua     |   5 ++
 4 files changed, 177 insertions(+)
 create mode 100644 .clang-format
 create mode 100644 .gitignore
 create mode 100644 src/main.c
 create mode 100644 xmake.lua

diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..c17e64a
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,25 @@
+BasedOnStyle: WebKit
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+AlignConsecutiveDeclarations: false
+AlignConsecutiveAssignments: false
+AlignTrailingComments: true
+ColumnLimit: 105
+BreakBeforeBraces: Attach
+AllowShortIfStatementsOnASingleLine: false
+AllowShortLoopsOnASingleLine: false
+AllowShortFunctionsOnASingleLine: false
+AllowShortLambdasOnASingleLine: false
+PointerAlignment: Left
+SpaceBeforeParens: Never
+SpacesInParentheses: false
+SpacesInConditionalStatement: false
+SpacesInContainerLiterals: false
+SpaceAfterCStyleCast: false
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeSquareBrackets: false
+SpacesBeforeTrailingComments: 2
+PenaltyBreakAssignment: 1000
+NamespaceIndentation: All
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..19e2669
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+# Xmake cache
+.xmake/
+build/
+
+# MacOS Cache
+.DS_Store
+
+.session.vim
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..0c3aa6a
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,139 @@
+#include <arpa/inet.h>
+#include <assert.h>
+#include <netinet/in.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define MAX_CONNECTIONS 5
+#define STRING_LEN 64
+
+typedef struct {
+    uint8_t packet_id;
+    uint8_t protocol_version;
+    char username[STRING_LEN];
+    char key[STRING_LEN];
+    uint8_t unused;
+} __attribute__((packed)) player_ident_t;
+
+typedef struct {
+    uint8_t packet_id;
+    uint8_t protocol_version;
+    char name[STRING_LEN];
+    char motd[STRING_LEN];
+    uint8_t user_type;
+} __attribute__((packed)) server_ident_t;
+
+typedef struct {
+    uint8_t packet_id;
+} __attribute__((packed)) level_initialize_t;
+
+typedef struct {
+    uint8_t packet_id;
+    uint16_t length;
+    uint8_t data[1024];
+    uint8_t percent_complete;
+} __attribute__((packed)) chunk_t;
+
+typedef struct {
+    uint8_t packet_id;
+    uint16_t x_size;
+    uint16_t y_size;
+    uint16_t z_size;
+} __attribute__((packed)) level_finalize_t;
+
+void trim_string(char* str) {
+    for(int i = STRING_LEN - 1; i > 0; i--) {
+        if(str[i] != 0x20)
+            break;
+        str[i] = 0;
+    }
+}
+
+int main() {
+    int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    assert(sock >= 0 && "Failed to create socket");
+
+    int opt = 1;
+    int result = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+    assert(result == 0 && "Failed to set option to reuse socket");
+
+    struct sockaddr_in serv_addr = {
+        .sin_family = AF_INET,
+        .sin_addr.s_addr = INADDR_ANY,
+        .sin_port = htons(25565),
+    };
+
+    result = bind(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
+    assert(result == 0 && "Socket bind failed");
+
+    while(1) {
+        result = listen(sock, MAX_CONNECTIONS);
+        assert(result == 0 && "Failed to listen on socket");
+
+        struct sockaddr_in client_addr = { 0 };
+        socklen_t size = sizeof(client_addr);
+        int conn = accept(sock, (struct sockaddr*)&client_addr, &size);
+        assert(conn >= 0 && "Failed to accept connection");
+
+        char client_ip[INET_ADDRSTRLEN];
+        inet_ntop(AF_INET, &client_addr.sin_addr, client_ip, sizeof(client_ip));
+        printf("Connection accepted from %s\n", client_ip);
+
+        char buf[1024] = { 0 };
+        result = recv(conn, buf, 1024, 0);
+        assert(result >= 0 && "Failed to recieve data");
+
+        if(buf[0] == 0x00) {
+            player_ident_t* player_ident = (player_ident_t*)&buf;
+            trim_string(player_ident->username);
+            trim_string(player_ident->key);
+
+            if(player_ident->protocol_version == 0) {
+                continue;
+            }
+
+            printf("Protocol Version: %x\nUsername: %s\nVerification Key: %s\n",
+                player_ident->protocol_version, player_ident->username, player_ident->key);
+
+            send(conn,
+                &(server_ident_t){
+                    .packet_id = 0x00,
+                    .protocol_version = 0x07,
+                    .name = "hello",
+                    .motd = "world",
+                    .user_type = 0x00,
+                },
+                sizeof(server_ident_t), 0);
+
+            send(conn,
+                &(level_initialize_t){
+                    .packet_id = 0x02,
+                },
+                sizeof(level_initialize_t), 0);
+
+            send(conn,
+                &(chunk_t){
+                    .packet_id = 0x03,
+                    .length = 0,
+                    .data = { 0 },
+                    .percent_complete = 100,
+                },
+                sizeof(chunk_t), 0);
+
+            send(conn,
+                &(level_finalize_t){
+                    .packet_id = 0x04,
+                    .x_size = htons(0),
+                    .y_size = htons(0),
+                    .z_size = htons(0),
+                },
+                sizeof(level_finalize_t), 0);
+        }
+    }
+
+    close(sock);
+
+    return 0;
+}
diff --git a/xmake.lua b/xmake.lua
new file mode 100644
index 0000000..35cf5c0
--- /dev/null
+++ b/xmake.lua
@@ -0,0 +1,5 @@
+add_rules("mode.debug", "mode.release")
+
+target("minecraft-server")
+    set_kind("binary")
+    add_files("src/*.c")