Bug 1287585

Description of problem:

lpoptions -l should show the available printer options. Instead it fails with 'lpoptions: Unable to get PPD file for Printername: Not Found'. Tracing the network traffic shows that the client tries to fetch the PPD file directly from the printer instead of the print server. Of course the printer does not provide the PPD file so the request fails.


Version-Release number of selected component (if applicable):

cups-client-2.0.3-1.fc22.x86_64


How reproducible:

always.


Steps to Reproduce:
1. Set up printer server using IPP to access the network printer (i.e.: ipp://X.X.X.X/ipp)
2. Set up the client /etc/cups/client.conf to access 'ServerName printerserver'. Disable local printer server on the client.
3. Run lpoptions -l on the client.


Actual results:

[hawk@iconia ~]$ lpoptions -l
lpoptions: Unable to get PPD file for Canon_PS: Not Found


Expected results:

[hawk@denobula ~]$ lpoptions -l
Opt2CF/Cassette Feeding Unit: False *True
...


Additional info:

The problem does not seem to be new. This (old) Debian bug report describes the same problem and shows when the problematic code was introduced:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=729713

The conclusion from the mentioned report is that due to the use of IPP cups thinks there is another cups server. Of course this works if you run a local cups daemon that needs to fetch the PPD from the 'real' server. In this case it mistakenly thinks it needs to fetch the PPD directly from the printer.

Removing the mentioned code element from cups/util.c makes lpoptions work as expected but I guess will break fetching the right PPD if a local server is running.

Here is the root cause from cups/util.c

    if (device_uri &&
        (!strncmp(device_uri, "ipp://", 6) ||
         !strncmp(device_uri, "ipps://", 7) ||
         ((strstr(device_uri, "._ipp.") != NULL ||
           strstr(device_uri, "._ipps.") != NULL) &&
          !strcmp(device_uri + strlen(device_uri) - 5, "/cups"))))
    {
     /*
      * Statically-configured shared printer.
      */

      httpSeparateURI(HTTP_URI_CODING_ALL, _httpResolveURI(device_uri, uri, sizeof(uri), _HTTP_RESOLVE_DEFAULT, NULL, NULL), scheme, sizeof(scheme), username, sizeof(username), host, hostsize, port, resource, resourcesize);
      ippDelete(response);

      DEBUG_printf(("5cups_get_printer_uri: Resolved to host=\"%s\", port=%d, resource=\"%s\"", host, *port, resource));
      return (1);
    }
    else