Cannot print to Xerox Phaser 8200 via IPP

[michaelrsweet]

Version: 1.1.20
CUPS.org User: twaugh.redhat

See https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=122352.

The Xerox Phaser 8200 IPP implementation uses Spyglass_MicroServer/2.01FC1, which has odd (but compliant) behaviour regarding HTTP/1.1 100 Continue result codes. You can see a libpcap-style traffic capture log at the Bugzilla report showing this in detail.

A 100 result code is always sent by this IPP implementation after it has received the HTTP headers, but slowly enough that it is not received until after the first write from the job file.

The code (cups/util.c:cupsDoFileRequest) goes:

    rewind(file);

    while ((bytes = fread(buffer, 1, sizeof(buffer), file)) > 0)
    {
      if (httpCheck(http))
        break;

      if (httpWrite(http, buffer, bytes) < bytes)
        break;
    }

[...]

while ((status = httpUpdate(http)) == HTTP_CONTINUE);

Since there is no final result code to read we end up stuck in recv().

Here is a patch to handle mid-request Continue result codes.

[michaelrsweet]

CUPS.org User: mike

Please try the attached patch instead, which avoids using goto...

[michaelrsweet]

CUPS.org User: mike

Fixed in CVS - the anonymous CVS repository will be updated at midnight EST.

[michaelrsweet]

"cups-continue.patch":

--- cups-1.1.20/cups/util.c.continue 2004-05-11 17:52:08.000000000 +0100
+++ cups-1.1.20/cups/util.c 2004-05-11 17:57:48.000000000 +0100
@@ -293,7 +293,11 @@
while ((bytes = fread(buffer, 1, sizeof(buffer), file)) > 0)
{
if (httpCheck(http))

•   break;
  

• {
  

•   status = httpUpdate (http);
  

•   if (status != HTTP_CONTINUE)
  

•     goto check_status;
  

• }
  

  if (httpWrite(http, buffer, bytes) < bytes)
  break;
  @@ -308,6 +312,7 @@

  while ((status = httpUpdate(http)) == HTTP_CONTINUE);

• check_status:
  DEBUG_printf(("cupsDoFileRequest: status = %d\n", status));

  if (status == HTTP_UNAUTHORIZED)

[michaelrsweet]

"str716.patch":

Index: util.c

RCS file: /development/cvs/cups/cups/util.c,v
retrieving revision 1.117
diff -u -r1.117 util.c
--- util.c 25 Feb 2004 20:14:51 -0000 1.117
+++ util.c 13 May 2004 13:45:25 -0000
@@ -278,6 +278,8 @@
DEBUG_puts("cupsDoFileRequest: ipp write...");

 request->state = IPP_IDLE;

• status = HTTP_CONTINUE;

if (ippWrite(http, request) != IPP_ERROR)
if (filename != NULL)
{
@@ -292,7 +294,10 @@
while ((bytes = fread(buffer, 1, sizeof(buffer), file)) > 0)
{
if (httpCheck(http))

•   break;
  

• {
  

•   if ((status = httpUpdate(http)) != HTTP_CONTINUE)
  

•     break;
  

•      }
  

  if (httpWrite(http, buffer, bytes) < bytes)
  break;
  @@ -305,7 +310,8 @@

  DEBUG_puts("cupsDoFileRequest: update...");

• while ((status = httpUpdate(http)) == HTTP_CONTINUE);

• while (status == HTTP_CONTINUE)

•  status = httpUpdate(http);
  

  DEBUG_printf(("cupsDoFileRequest: status = %d\n", status));