feat: initial commit of Ghaymah internal DNS, TCP and security testing suite and report

scripts/tar_util.js

@@ -0,0 +1,67 @@
+const zlib = require('zlib');
+const fs = require('fs');
+
+function createTar(files) {
+  const chunks = [];
+
+  for (const file of files) {
+    const name = file.name;
+    const content = Buffer.isBuffer(file.content) ? file.content : Buffer.from(file.content, 'utf8');
+    const size = content.length;
+
+    const header = Buffer.alloc(512);
+    // name (0..99)
+    header.write(name, 0, 100, 'utf8');
+    // mode (100..107)
+    header.write('0000644\0', 100, 8, 'utf8');
+    // uid (108..115)
+    header.write('0000000\0', 108, 8, 'utf8');
+    // gid (116..123)
+    header.write('0000000\0', 116, 8, 'utf8');
+    // size (124..135)
+    header.write(size.toString(8).padStart(11, '0') + '\0', 124, 12, 'utf8');
+    // mtime (136..147)
+    const mtime = Math.floor(Date.now() / 1000);
+    header.write(mtime.toString(8).padStart(11, '0') + '\0', 136, 12, 'utf8');
+    // chksum placeholder (148..155) - 8 spaces
+    header.write('        ', 148, 8, 'utf8');
+    // typeflag (156) - '0' regular file
+    header.write('0', 156, 1, 'utf8');
+    // magic (257..262) - 'ustar\0'
+    header.write('ustar\0', 257, 6, 'utf8');
+    // version (263..264) - '00'
+    header.write('00', 263, 2, 'utf8');
+
+    // calculate checksum
+    let sum = 0;
+    for (let i = 0; i < 512; i++) {
+      sum += header[i];
+    }
+    header.write(sum.toString(8).padStart(6, '0') + '\0 ', 148, 8, 'utf8');
+
+    chunks.push(header);
+    chunks.push(content);
+
+    // pad content to 512 bytes
+    const remainder = size % 512;
+    if (remainder > 0) {
+      chunks.push(Buffer.alloc(512 - remainder));
+    }
+  }
+
+  // 2 blocks of 512 zeros at end of tar
+  chunks.push(Buffer.alloc(1024));
+
+  const tarBuffer = Buffer.concat(chunks);
+  return zlib.gzipSync(tarBuffer);
+}
+
+const testTarGz = createTar([
+  { name: 'Dockerfile', content: 'FROM alpine:latest\nCMD ["echo", "hello"]\n' },
+  { name: 'test.txt', content: 'hello world\n' }
+]);
+
+console.log('Tar.gz created successfully, size:', testTarGz.length);
+// verify decompression
+const uncompressed = zlib.gunzipSync(testTarGz);
+console.log('Uncompressed tar size:', uncompressed.length);