** Changed in: cups (Ubuntu) Assignee: (unassigned) => Till Kamppeter (till-kamppeter)
** Changed in: cups (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1544571 Title: Unable to get PPD file for ...: Moved Permanently Status in cups package in Ubuntu: New Bug description: 1) lsb_release -rd Description: Ubuntu 14.04.3 LTS Release: 14.04 2) apt-cache policy cups-client cups-client: Installed: 1.7.2-0ubuntu1.7 Candidate: 1.7.2-0ubuntu1.7 Version table: *** 1.7.2-0ubuntu1.7 0 500 http://de.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages 500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages 100 /var/lib/dpkg/status 1.7.2-0ubuntu1 0 500 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages My problem: *What I expected to happen: In our environment we have a cups print server delivering different print queues, e.g. elbe_transparency. For all queues I get the same faulty result running lpoptions, e.g. for lpoptions -l -d elbe_transparency I get lpoptions: Unable to get PPD file for elbe_transparency: Moved Permanently. And also GUI apps like Evince have problems due to this bug. * What I did so far: (a) I used wireshark to capture the ipp protocol and found that lpoptions tries to retrieve the PPD for the printer elbe with device-uri "ipp://elbe.tnt.ifn.et.tu-dresden.de:631" from that device URI instead of the cups server with printer-uri-supported "ipp://192.168.3.5:631/printers/elbe_transparency". This makes sense when the device URI is actually another CUPS server, but not when, as in our case, it is a network-attached printer that "talks" IPP natively. It will not have the PPD at the CUPS-specific URL. (b) I used "strace -s1000 lpoptions -p elbe_transparency -l 2>lpoptions.txt" to get ... sendto(9, "GET /.ppd HTTP/1.1\r\nHost: elbe.tnt.ifn.et.tu-dresden.de:631\r\nUser-Agent: CUPS/1.7.2 (Linux 3.16.0-60-generic; x86_64) IPP/2.0\r\n\r\n", 129, 0, NULL, 0) = 129 poll([{fd=9, events=POLLIN}], 1, 60000) = 1 ([{fd=9, revents=POLLIN}]) recvfrom(9, "HTTP/1.1 301 Moved Permanently\r\nServer: Virata-EmWeb/R6_2_1\r\nLocation: https://elbe.tnt.ifn.et.tu-dresden.de/.ppd\r\nContent-Type: text/html\r\nContent-Length: 110\r\n\r\n<HEAD><TITLE>Moved</TITLE></HEAD><BODY><A HREF=\"https://elbe.tnt.ifn.et.tu-dresden.de/.ppd\">Moved</A></BODY>\r\n", 2048, 0, NULL, NULL) = 273 ... which shows the same problem as described above. * Where does the problem come from The actual problem can be found in cups/util.c (1.7.2) within function cups_get_printer_uri() starting at line 1623. At line 1719 one finds 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")))){...} else if ((attr = ippFindAttribute(response, "member-uris", IPP_TAG_URI)) != NULL) {...} else if ((attr = ippFindAttribute(response, "printer-uri-supported", IPP_TAG_URI)) != NULL){...} The problem is that always the statement of the first if block is executed as our printer has device-uri "ipp://elbe.tnt.ifn.et.tu- dresden.de:631. However, it should execute the third block with printer-uri-supported. This problem was discussed several times before, e.g. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=729713. In later versions of cups this was fixed by if (device_uri && (((!strncmp(device_uri, "ipp://", 6) || !strncmp(device_uri, "ipps://", 7)) && (strstr(device_uri, "/printers/") != NULL || strstr(device_uri, "/classes/") != NULL)) || ((strstr(device_uri, "._ipp.") != NULL || strstr(device_uri, "._ipps.") != NULL) && !strcmp(device_uri + strlen(device_uri) - 5, "/cups")))) to ensure the device URI is actually another CUPS server. Please, could you fix this asap. We have many Ubuntu machines in our environment and this bug is really annoying. Many thanks for your help in advance. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1544571/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp