allow using local config file for server

wvnc.c

@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include <rfb/rfbclient.h>
 #include <pthread.h>
 #ifdef USE_ZLIB
@@ -422,24 +423,64 @@ static char *get_password(rfbClient *client)
 
 void open_session(void *data, const char *addr)
 {
-    // main loop
     int argc = 2;
     char *argv[2];
     argv[0] = "-listennofork";
-    argv[1] = (char *)addr;
+    int len = 0;
+    FILE *fp = NULL;
+    char *buffer = NULL;
+    char c;
     wvnc_user_data_t *user_data = get_user_data(data);
+    if (access(addr, F_OK) != -1)
+    {
+        //open the file
+        fp = fopen(addr, "r");
+        if (fp == NULL)
+        {
+            vnc_fatal(data, "Unable to read server file");
+            return;
+        }
+
+        // find length of first line
+        // lines end in "\n", but some malformed text files may not have this char at all
+        // and whole file contents will be considered as the first line
+        while ((c = fgetc(fp)) != EOF)
+        {
+            if (c == '\n')
+            {
+                break;
+            }
+            len++;
+        }
+
+        // allocate memory for size of first line (len)
+        buffer = (char *)malloc(sizeof(char) * len);
+
+        // seek to beginning of file
+        fseek(fp, 0, SEEK_SET);
+
+        fread(buffer, sizeof(char), len, fp);
+        fclose(fp);
+        argv[1] = buffer;
+    }
+    else
+    {
+        argv[1] = (char *)addr;
+    }
     LOG("client.BBP: %d\n", user_data->bbp);
     LOG("client.flag: %d\n", user_data->flag);
     LOG("client.JPEG.quality: %d\n", user_data->quality);
-    LOG("Server: %s\n", addr);
+    LOG("Server: %s\n", argv[1]);
     //LOG("Rate is %d\n", user_data->rate);
     if (!rfbInitClient(user_data->vncl, &argc, argv))
     {
         user_data->vncl = NULL; /* rfbInitClient has already freed the client struct */
         //cleanup(vncl);
         vnc_fatal(user_data, "Cannot connect to the server");
+        if(buffer) free(buffer);
         return;
     }
+    if(buffer) free(buffer);
     while (1)
     {
         if (!user_data->status)