NSS: Add InvalidateGroupById handler There are some situations where, from the backend, the NSS responder will have to be notified to invalidate a group. In order to achieve this in a clean way, let's add the InvalidateGroupById handler and make use of it later in this very same series. Related: https://pagure.io/SSSD/sssd/issue/2653 Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

Fix minor spelling mistakes in responder/* Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

NSS: Fix "-Wold-style-definition" caught by GCC Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

NSS: Fix typo inigroups -> initgroups Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

NSS: Fix invalidating memory cache for subdomain users get_next_domain() was called without any special flags, meaning it only iterates over main domains. We need to instead use the SSS_GND_DESCEND flag to make sure sudomains are taken into account, too. Reviewed-by: Michal Židek <mzidek@redhat.com>

NSS: Rename the interface to invalidate memory cache initgroup records for consistency Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

NSS: Add sbus interface to clear memory cache Adds three new NSS interface sbus methods to disable memory caches of users, groups and initgroups. It's enough to add this interface to the NSS responder because the NSS responder is the only writer to the memory cache. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

nss: rewrite nss responder so it uses cache_req Given the size of the current nss responder it was quite impossible to simply switch into using the cache_req interface, especially because most of the code was duplication of cache lookups. This patch completely rewrites the responder from scratch. The amount of code was reduced to less than a half lines of code with no code duplication, better documentation and better maintainability and readability. All functionality should be intact. *Code organization* All protocol (parsing input message and send a reply) is placed in nss_protocol.c. Functions that deals with creating a reply packet are placed into their specific nss_protocol_$object.c files. All supported commands are placed into nss_cmd.c. Functions that deals with cache req are in nss_get_object.c and nss_enum.c. *Code flow for non-enumeration* An nss_getby_$input-type is called for each non-enumeration command. This function parses the input message, creates a cache_req_data structure and issues nss_get_object that calls cache_req. When this request is done nss_getby_done make sure a reply is sent to the client. *Comments on enumeration* I made some effort to make sure enumeration shares the same code for users, groups, services and netgroups. Netgroups now uses nss negative cache instead of implementing its own. Resolves: https://fedorahosted.org/sssd/ticket/3151 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

DP: Remove old data provider interface Reverse data provider interface is moved to a better location in NSS responder. All responders now can have an sbus interface defined per data provider connection. The unused old data provider interface is removed. Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>