nss: Fix invalid enum nss_status return values. The upstream glibc test nss/bug17079 covers several cases where the NSS infrastructure passes invalid pointers to NSS plugins. The plugins should return correct results for the invalid values e.g. ERANGE, but it should do so by setting *errnop to the error and returning NSS_STATUS_TRYAGAIN. This commit fixes the group, netgroup, passwd and service handling code to correctly return ERANGE in *errnop and NSS_TATUS_TRYAGAIN in the case of invalid buffer (NULL) or zero sized buffer length. This fixes the nss/bug17079 regression test when run in a test configuration with sss enabled for any of the above mentioned services. Upstream glibc bug: Bug 22530 - FAIL: nss/bug17079 due to _nss_sss_getpwuid_r https://sourceware.org/bugzilla/show_bug.cgi?id=22530 Merges: https://pagure.io/SSSD/sssd/pull-request/3561 Signed-off-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Florian Weimer <fweimer@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

Suppress safealign warnings with DISCARD_ALIGN. These warnings were all false positives. fixes: https://fedorahosted.org/sssd/ticket/1359 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

Properly align buffer when storing pointers. Properly align buffer address to sizeof(char *) when storing pointers to strings. resolves: https://fedorahosted.org/sssd/ticket/1359

sss_client: Use SAFEALIGN_COPY_<type> macros where appropriate. resolves: https://fedorahosted.org/sssd/ticket/1359

Revert the client packet length, too, after reverting the packet protocol

NSS: Restore original protocol for getservbyport When fixing an endianness bug, we changed the protocol unnecessarily.

Send 16bit protocol numbers from the sss_client https://fedorahosted.org/sssd/ticket/1348

NSS: Add client support for [set|get|end]servent()

NSS: Add client support for services (non-enumeration)