fix: harden FTP/send paths and driver registration (audit round)

- send_all(): full send loop for the elfldr payload push and the FTP STOR
  (a single send() can legally transfer less than requested)
- PASV: check command result and zero the buffer before parsing (no more
  parsing of uninitialized stack on FTP failure)
- DllRegisterServer: verify the per-user key was actually written and
  return a real HRESULT instead of unconditional S_OK
- README: 'Verify the download' section with release checksums

.gitignore

@@ -14,3 +14,4 @@ _BOZZE/
 # runtime
 pscapture-app.log
 pscapture.ini
+dist/SHA256SUMS.txt

README.md

@@ -76,6 +76,20 @@ IP — the app retries by itself every 2 seconds.
 🔧 What the app does under the hood when you press Start:
 [`docs/INSTALLER.md`](docs/INSTALLER.md).
 
+## 🔒 Verify the download
+
+The release binaries are built from this repository's sources. Every release
+carries a `SHA256SUMS.txt` — check it before running the exe:
+
+```
+certutil -hashfile pscapture.exe SHA256     (Windows)
+sha256sum -c SHA256SUMS.txt                 (Linux/macOS)
+```
+
+And you never have to trust any binary: the whole toolchain is documented in
+[`docs/BUILD.md`](docs/BUILD.md) — rebuild `pscapture.exe` from the sources
+yourself and compare.
+
 ## 📦 Repository layout
 
 ```

pc/ps5cam.c

@@ -2545,11 +2545,22 @@ __declspec(dllexport) HRESULT WINAPI
 DllRegisterServer(void)
 {
   WCHAR dll[MAX_PATH];
+  WCHAR p[512];
+  WCHAR guid[64];
+  HKEY k;
 
   if(!GetModuleFileNameW(g_hinst_ps5cam, dll, MAX_PATH)) return E_FAIL;
   registra(HKEY_CURRENT_USER, dll);          /* niente admin */
   registra(HKEY_LOCAL_MACHINE, dll);         /* se siamo admin, meglio */
-  return S_OK;
+  /* il risultato si verifica davvero: se almeno la chiave per-utente e'
+   * leggibile la registrazione e' utilizzabile (HKCR unisce HKCU+HKLM) */
+  StringFromGUID2(&CLSID_Ps5Cam, guid, 64);
+  wsprintfW(p, L"Software\\Classes\\CLSID\\%s\\InprocServer32", guid);
+  if(RegOpenKeyExW(HKEY_CURRENT_USER, p, 0, KEY_READ, &k) == ERROR_SUCCESS) {
+    RegCloseKey(k);
+    return S_OK;
+  }
+  return E_FAIL;
 }
 
 __declspec(dllexport) HRESULT WINAPI

pc/pscapture.c

@@ -243,6 +243,22 @@ ftp_cmd(int c, const char *cmd, char *risp, int sz)
   return buf[0] == '2' || buf[0] == '3' || buf[0] == '1' ? 0 : -1;
 }
 
+/* invio completo: TCP non garantisce che una singola send() trasferisca
+ * tutti i byte richiesti */
+static int
+send_all(int s, const char *d, int len)
+{
+  int off = 0;
+
+  while(off < len) {
+    int n = send((SOCKET)s, d + off, len - off, 0);
+
+    if(n <= 0) return -1;
+    off += n;
+  }
+  return 0;
+}
+
 static int
 ftp_leggi_file(const char *ip, const char *file, char *out, int outsz)
 {
@@ -251,7 +267,8 @@ ftp_leggi_file(const char *ip, const char *file, char *out, int outsz)
   int n;
 
   if(c < 0) return -1;
-  ftp_cmd(c, "PASV\r\n", buf, sizeof(buf));
+  memset(buf, 0, sizeof(buf));
+  if(ftp_cmd(c, "PASV\r\n", buf, sizeof(buf))) goto ko;
   {
     char *p = strchr(buf, '(');
     unsigned h1, h2, h3, h4, p1, p2;
@@ -292,7 +309,8 @@ ftp_manda_file(const char *ip, const char *remoto, const unsigned char *d,
   char buf[4096];
 
   if(c < 0) return -1;
-  ftp_cmd(c, "PASV\r\n", buf, sizeof(buf));
+  memset(buf, 0, sizeof(buf));
+  if(ftp_cmd(c, "PASV\r\n", buf, sizeof(buf))) goto ko;
   {
     char *p = strchr(buf, '(');
     unsigned h1, h2, h3, h4, p1, p2;
@@ -310,7 +328,7 @@ ftp_manda_file(const char *ip, const char *remoto, const unsigned char *d,
     if(recv((SOCKET)c, buf, sizeof(buf) - 1, 0) <= 0 || buf[0] != '1')
       goto ko;
   }
-  if(send((SOCKET)ds, (const char *)d, len, 0) != len) goto ko;
+  if(send_all(ds, (const char *)d, len)) goto ko;
   closesocket((SOCKET)ds);
   ds = -1;
   recv((SOCKET)c, buf, sizeof(buf) - 1, 0);
@@ -575,7 +593,12 @@ lavoro_deploy(LPVOID p)
     free(elf);
     return 1;
   }
-  send((SOCKET)s, (const char *)elf, len, 0);
+  if(send_all(s, (const char *)elf, len)) {
+    logUI("ERRORE: invio payload all'elfldr incompleto");
+    closesocket((SOCKET)s);
+    free(elf);
+    return 1;
+  }
   /* 3) leggi lo stream di log per qualche secondo */
   {
     DWORD t0 = GetTickCount();