Clean up default value for X509 parameters

Let's avoid making this too complex and force every user to know about
magical functions.

common/os/os.cxx

 	*dirp = dir;
 	return 0;
 }
-
-int fileexists(char *file)
-{
-#ifdef WIN32
-  return (GetFileAttributes(file) == INVALID_FILE_ATTRIBUTES) ? -1 : 0;
-#else
-  return access(file, R_OK);
-#endif
-}
-
-

common/os/os.h

  */
 int getvnchomedir(char **dirp);
 
-/*
- * Check if the file exists
- *
- * Returns:
- * 0 - Success
- * -1 - Failure
- */
-int fileexists(char *file);
-
 #endif /* OS_OS_H */

common/rfb/CSecurityTLS.cxx

 
 using namespace rfb;
 
-StringParameter CSecurityTLS::X509CA("X509CA", "X509 CA certificate", "", ConfViewer);
-StringParameter CSecurityTLS::X509CRL("X509CRL", "X509 CRL file", "", ConfViewer);
+static const char* homedirfn(const char* fn);
+
+StringParameter CSecurityTLS::X509CA("X509CA", "X509 CA certificate",
+                                     homedirfn("x509_ca.pem"),
+                                     ConfViewer);
+StringParameter CSecurityTLS::X509CRL("X509CRL", "X509 CRL file",
+                                     homedirfn("x509_crl.pem"),
+                                     ConfViewer);
 
 static LogWriter vlog("TLS");
 
+static const char* homedirfn(const char* fn)
+{
+  static char full_path[PATH_MAX];
+  char* homedir = NULL;
+
+  if (getvnchomedir(&homedir) == -1)
+    return "";
+
+  snprintf(full_path, sizeof(full_path), "%s%s", homedir, fn);
+
+  delete [] homedir;
+
+  return full_path;
+}
+
 CSecurityTLS::CSecurityTLS(CConnection* cc, bool _anon)
   : CSecurity(cc), session(NULL), anon_cred(NULL), cert_cred(NULL),
     anon(_anon), tlsis(NULL), tlsos(NULL), rawis(NULL), rawos(NULL)
     throw AuthFailureException("gnutls_global_init failed");
 }
 
-void CSecurityTLS::setDefaults()
-{
-  char* homeDir = NULL;
-
-  if (getvnchomedir(&homeDir) == -1) {
-    vlog.error("Could not obtain VNC home directory path");
-    return;
-  }
-
-  int len = strlen(homeDir) + 1;
-  CharArray caDefault(len + 11);
-  CharArray crlDefault(len + 12);
-  sprintf(caDefault.buf, "%sx509_ca.pem", homeDir);
-  sprintf(crlDefault.buf, "%s509_crl.pem", homeDir);
-  delete [] homeDir;
-
- if (!fileexists(caDefault.buf))
-   X509CA.setDefaultStr(caDefault.buf);
- if (!fileexists(crlDefault.buf))
-   X509CRL.setDefaultStr(crlDefault.buf);
-}
-
 void CSecurityTLS::shutdown()
 {
   if (session) {

common/rfb/CSecurityTLS.h

     virtual const char* description() const
       { return anon ? "TLS Encryption without VncAuth" : "X509 Encryption without VncAuth"; }
     virtual bool isSecure() const { return !anon; }
-    static void setDefaults();
 
     static StringParameter X509CA;
     static StringParameter X509CRL;

common/rfb/Configuration.cxx

   strFree(def_value);
 }
 
-void StringParameter::setDefaultStr(const char* v) {
-  strFree(def_value);
-  def_value = strDup(v);
-  strFree(value);
-  value = strDup(v);
-}
-
 bool StringParameter::setParam(const char* v) {
   LOCK_CONFIG;
   if (immutable) return true;

common/rfb/Configuration.h

     virtual bool setParam(const char* value);
     virtual char* getDefaultStr() const;
     virtual char* getValueStr() const;
-    void setDefaultStr(const char* v);
     operator const char*() const;
 
     // getData() returns a copy of the data - it must be delete[]d by the

common/rfb/SecurityClient.cxx

 bail:
   throw Exception("Security type not supported");
 }
-
-void SecurityClient::setDefaults()
-{
-#ifdef HAVE_GNUTLS
-    CSecurityTLS::setDefaults();
-#endif
-}

common/rfb/SecurityClient.h

     /* Create client side CSecurity class instance */
     CSecurity* GetCSecurity(CConnection* cc, rdr::U32 secType);
 
-    static void setDefaults(void);
-
     static StringParameter secTypes;
   };
 

vncviewer/vncviewer.cxx

 #endif
 
 #include <rfb/Logger_stdio.h>
-#include <rfb/SecurityClient.h>
-#include <rfb/Security.h>
 #ifdef HAVE_GNUTLS
 #include <rfb/CSecurityTLS.h>
 #endif
   bindtextdomain(PACKAGE_NAME, CMAKE_INSTALL_FULL_LOCALEDIR);
   textdomain(PACKAGE_NAME);
 
-  rfb::SecurityClient::setDefaults();
-
   // Write about text to console, still using normal locale codeset
   fprintf(stderr,"\n%s\n", about_text());
 

vncviewer/vncviewer.man

 .B \-X509CA \fIpath\fP
 Path to CA certificate to use when authenticating remote servers using any
 of the X509 security schemes (X509None, X509Vnc, etc.). Must be in PEM
-format. Default is \fB$HOME/.vnc/x509_ca.pem\fP, if it exists.
+format. Default is \fB$HOME/.vnc/x509_ca.pem\fP.
 .
 .TP
 .B \-X509CRL \fIpath\fP
 Path to certificate revocation list to use in conjunction with
 \fB-X509CA\fP. Must also be in PEM format. Default is
-\fB$HOME/.vnc/x509_crl.pem\fP, if it exists.
+\fB$HOME/.vnc/x509_crl.pem\fP.
 .
 .TP
 .B \-Shared