Add UltraVNC Repeater support in libvncclient

[jes: adjusted coding style, made sure port is initialized correctly]

Signed-off-by: Vic Lee <llyzs@163.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

3 files changed, 76 insertions, 1 deletions

diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 83cfbf9..8aa6348 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -415,6 +415,51 @@ ConnectToRFBServer(rfbClient* client,const char *hostname, int port)
   return SetNonBlocking(client->sock);
 }
 
+/*
+ * ConnectToRFBRepeater.
+ */
+
+rfbBool ConnectToRFBRepeater(rfbClient* client,const char *repeaterHost, int repeaterPort, const char *destHost, int destPort)
+{
+  unsigned int host;
+  rfbProtocolVersionMsg pv;
+  int major,minor;
+  char tmphost[250];
+
+  if (!StringToIPAddr(repeaterHost, &host)) {
+    rfbClientLog("Couldn't convert '%s' to host address\n", repeaterHost);
+    return FALSE;
+  }
+
+  client->sock = ConnectClientToTcpAddr(host, repeaterPort);
+
+  if (client->sock < 0) {
+    rfbClientLog("Unable to connect to VNC repeater\n");
+    return FALSE;
+  }
+
+  if (!SetNonBlocking(client->sock))
+    return FALSE;
+
+  if (!ReadFromRFBServer(client, pv, sz_rfbProtocolVersionMsg))
+    return FALSE;
+  pv[sz_rfbProtocolVersionMsg] = 0;
+
+  /* UltraVNC repeater always report version 000.000 to identify itself */
+  if (sscanf(pv,rfbProtocolVersionFormat,&major,&minor) != 2 || major != 0 || minor != 0) {
+    rfbClientLog("Not a valid VNC repeater (%s)\n",pv);
+    return FALSE;
+  }
+
+  rfbClientLog("Connected to VNC repeater, using protocol version %d.%d\n", major, minor);
+
+  snprintf(tmphost, sizeof(tmphost), "%s:%d", destHost, destPort);
+  if (!WriteToRFBServer(client, tmphost, sizeof(tmphost)))
+    return FALSE;
+
+  return TRUE;
+}
+
 extern void rfbClientEncryptBytes(unsigned char* bytes, char* passwd);
 extern void rfbClientEncryptBytes2(unsigned char *where, const int length, unsigned char *key);
 
diff --git a/libvncclient/vncviewer.c b/libvncclient/vncviewer.c
index 111a7f6..fa150cd 100644
--- a/libvncclient/vncviewer.c
+++ b/libvncclient/vncviewer.c
@@ -119,6 +119,9 @@ rfbClient* rfbGetClient(int bitsPerSample,int samplesPerPixel,
   client->programName="";
   client->serverHost=strdup("");
   client->serverPort=5900;
+
+  client->destHost = NULL;
+  client->destPort = 5900;
   
   client->CurrentKeyboardLedState = 0;
   client->HandleKeyboardLedState = (HandleKeyboardLedStateProc)DummyPoint;
@@ -202,8 +205,15 @@ static rfbBool rfbInitConnection(rfbClient* client)
      given VNC server */
 
   if (!client->listenSpecified) {
-    if (!client->serverHost || !ConnectToRFBServer(client,client->serverHost,client->serverPort))
+    if (!client->serverHost)
       return FALSE;
+    if (client->destHost) {
+      if (!ConnectToRFBRepeater(client,client->serverHost,client->serverPort,client->destHost,client->destPort))
+        return FALSE;
+    } else {
+      if (!ConnectToRFBServer(client,client->serverHost,client->serverPort))
+        return FALSE;
+    }
   }
 
   /* Initialise the VNC connection, including reading the password */
@@ -278,6 +288,19 @@ rfbBool rfbInitClient(rfbClient* client,int* argc,char** argv) {
       } else if (i+1<*argc && strcmp(argv[i], "-scale") == 0) {
         client->appData.scaleSetting = atoi(argv[i+1]);
         j+=2;
+      } else if (i+1<*argc && strcmp(argv[i], "-repeaterdest") == 0) {
+	char* colon=strchr(argv[i+1],':');
+
+	if(client->destHost)
+	  free(client->destHost);
+        client->destPort = 5900;
+
+	client->destHost = strdup(argv[i+1]);
+	if(colon) {
+	  client->destHost[(int)(colon-argv[i+1])] = '\0';
+	  client->destPort = atoi(colon+1);
+	}
+        j+=2;
       } else {
 	char* colon=strchr(argv[i],':');
 
@@ -342,6 +365,8 @@ void rfbClientCleanup(rfbClient* client) {
     close(client->listenSock);
   free(client->desktopName);
   free(client->serverHost);
+  if (client->destHost)
+    free(client->destHost);
   if (client->clientAuthSchemes)
     free(client->clientAuthSchemes);
   free(client);
diff --git a/rfb/rfbclient.h b/rfb/rfbclient.h
index a82ea22..bc4ec14 100644
--- a/rfb/rfbclient.h
+++ b/rfb/rfbclient.h
@@ -309,6 +309,10 @@ typedef struct _rfbClient {
 	/* The 0-terminated security types supported by the client.
 	 * Set by function SetClientAuthSchemes() */
 	uint32_t *clientAuthSchemes;
+
+	/* When the server is a repeater, this specifies the final destination */
+	char *destHost;
+	int destPort;
 } rfbClient;
 
 /* cursor.c */
@@ -326,6 +330,7 @@ extern rfbBool rfbEnableClientLogging;
 typedef void (*rfbClientLogProc)(const char *format, ...);
 extern rfbClientLogProc rfbClientLog,rfbClientErr;
 extern rfbBool ConnectToRFBServer(rfbClient* client,const char *hostname, int port);
+extern rfbBool ConnectToRFBRepeater(rfbClient* client,const char *repeaterHost, int repeaterPort, const char *destHost, int destPort);
 extern void SetClientAuthSchemes(rfbClient* client,const uint32_t *authSchemes, int size);
 extern rfbBool InitialiseRFBConnection(rfbClient* client);
 extern rfbBool SetFormatAndEncodings(rfbClient* client);