Subj : Re: Still unsolved problem
To   : netscape.public.mozilla.jseng
From : "Stu" <stu.email@emailme.com>
Date : Thu Jun 05 2003 11:57 am


> What is proxy_dns_resolve?
Heres the Code

/* Resolves a DNS name, and returns the IP address string.
 *
 * Maintains a private cache for the last resolved address (so this
 * function can be called multiple times with the same host argument
 * without doing actual DNS queries every time). */
static char *proxy_dns_resolve(const char *host)
{
    //static char *cache_host = NULL;
    //static char *cache_ip = NULL;
  static char cache_host[512] = {'\0'};
  static char cache_ip[512] = {'\0'};

  static int m_finished;    /* finished flag */
  int result;
  int status;
  host_info_t info;

    if (host)
  {
   const char *p;
      char *safe = NULL;
      int is_numeric_ip = 1;

      for(p=host; *p; p++)
   {
    if (!isdigit(*p) && *p != '.')
    {
     is_numeric_ip = 0;
     break;
    }
      }

   if (is_numeric_ip) {
         return strdup(host);
      }

      if ( (strlen(cache_host) >0) && (strlen(cache_ip) >0) &&
!strcmp(cache_host, host)) {
          return strdup(cache_ip);
      }

   safe = strdup(host);

   if (safe)
   {
        if (strlen(safe) > 64)
             safe[64] = '\0';

    /* clear finished flag */
    m_finished = 0;

    CMxLookup m_MxLookUp;

    m_MxLookUp.add_server(DEFAULT_DNS);

    result = m_MxLookUp.start_ip_lookup(safe);

    if (result < 0)
    {
     printf("DNS lookup failed to start.
Result(%s).\n",m_MxLookUp.error_string(result));
     return(NULL);
    }

    /* loop until finished */
    do
    {
     /* get the status of the lookup */
     status = m_MxLookUp.get_status(&info);

     /* check results */
     if (status == BTOMX_LOOKUP_STILL_ACTIVE)
     {
     }
     else if (status == BTOMX_LOOKUP_DONE_AND_FOUND)
     {
      /* read out the complete list of servers */
      while (info.valid)
      {
       printf("%-16s : %s : %s\n",info.ipaddr_str,info.canonical_name,
       info.orig_request_name);
       status = m_MxLookUp.get_status(&info);
      }

      m_finished = 1;
     }
     else
     {
      printf("DNS lookup completed.
Result(%s).\n",m_MxLookUp.error_string(status));
      m_finished = 1;
     }

     /* sleep for a bit */
     Sleep(100);

     /* call the timer event */
     m_MxLookUp.timer_event();

    } while (m_finished == 0);

        free(safe);
      }

   if (info.ipaddr)
   {
         char* cache_host_ptr =NULL;
     char* cache_ip_ptr = NULL;

     StrAllocCopy(&cache_host_ptr, host);
         StrAllocCopy(&cache_ip_ptr, info.ipaddr_str);

     strcpy(cache_host, cache_host_ptr);
     strcpy(cache_ip, cache_ip_ptr);
         return strdup(info.ipaddr_str);
      }
    }

    return NULL;
}

> When you say error, is this a JS exception? How is it getting reported?
I think its just an error, would the message say exception if it was one?
Its getting written to the screen by my ErrorReporter function.

> Also I see proxy_dnsResolve and proxy_dns_resove, I assume the latter is
the implementation called by both proxy_isInNet and proxy_dnsResolve? If
that's the case you might want to simplify your test and trying to just
invoke the dnsResolve and see what happens.

No proxy_dnsResolve is at the bottom layer proxy function, i've included
that code above.

> I'd start by seeing what the value of host is in FindProxyForURL then
check ipstr and ip in proxy_isInNet. You could dump this to a file fairly
easily if you don't want to go to the trouble of building a release with
symbols. (It's not that hard, though) I do the following:
>
im printf to screen with a sleep statement / a breakpoint. And the ipstr and
ip are not being written as the ReferenceError occurs before during the
function call. CallFunctionName then return false and my prog drops out.

Can u confirm that I should be able to use the release JS32.dll with a debug
build of my C++ project, cos that what i've been doing.

Thanks for the responses,
Stu.

.