Create credential helper trampoline, send stdin

Co-Authored-By: Sergio Padrino <1083228+sergiou87@users.noreply.github.com>

binding.gyp

@@ -55,6 +55,24 @@
           }]
         ]
       },
+      {
+        'target_name': 'desktop-credential-helper-trampoline',
+        'type': 'executable',
+        'defines': [
+          'CREDENTIAL_HELPER'
+        ],
+        'sources': [
+          'src/desktop-trampoline.c',
+          'src/socket.c'
+        ],
+        'conditions': [
+          ['OS=="win"', {
+            'link_settings': {
+              'libraries': [ 'Ws2_32.lib' ]
+            }
+          }]
+        ]
+      },
       {
         'target_name': 'ssh-wrapper',
         'type': 'executable',

src/desktop-trampoline.c

@@ -102,7 +102,15 @@ int runTrampolineClient(SOCKET *outSocket, int argc, char **argv, char **envp) {
     WRITE_STRING_OR_EXIT("environment variable", validEnvVars[idx]);
   }
 
-  // TODO: send stdin stuff?
+  char stdinBuffer[BUFFER_LENGTH + 1];
+  int stdinBytes = 0;
+
+  #ifdef CREDENTIAL_HELPER
+    stdinBytes = fread(stdinBuffer, sizeof(char), BUFFER_LENGTH, stdin);
+  #endif
+
+  stdinBuffer[stdinBytes] = '\0';
+  WRITE_STRING_OR_EXIT("stdin", stdinBuffer);
 
   char buffer[BUFFER_LENGTH + 1];
   size_t totalBytesRead = 0;
@@ -129,6 +137,13 @@ int runTrampolineClient(SOCKET *outSocket, int argc, char **argv, char **envp) {
 }
 
 int main(int argc, char **argv, char **envp) {
+
+  #ifdef CREDENTIAL_HELPER
+    setenv("DESKTOP_TRAMPOLINE_IDENTIFIER", "CREDENTIALHELPER");
+  #elif
+    setenv("DESKTOP_TRAMPOLINE_IDENTIFIER", "ASKPASS");
+  #endif
+
   if (initializeNetwork() != 0) {
     return 1;
   }