/* -1 == not found 0 == function found 1 == finished */ int __nss_lookup (service_user **ni, const char *fct_name, void **fctp) { *fctp = __nss_lookup_function (*ni, fct_name); while (*fctp == NULL && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE && (*ni)->next != NULL) { *ni = (*ni)->next; *fctp = __nss_lookup_function (*ni, fct_name); } return *fctp != NULL ? 0 : (*ni)->next == NULL ? 1 : -1; }
/* -1 == not found 0 == adjusted for next function 1 == finished */ int __nss_next2 (service_user **ni, const char *fct_name, const char *fct2_name, void **fctp, int status, int all_values) { if (all_values) { if (nss_next_action (*ni, NSS_STATUS_TRYAGAIN) == NSS_ACTION_RETURN && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_RETURN && nss_next_action (*ni, NSS_STATUS_NOTFOUND) == NSS_ACTION_RETURN && nss_next_action (*ni, NSS_STATUS_SUCCESS) == NSS_ACTION_RETURN) return 1; } else { /* This is really only for debugging. */ if (__builtin_expect (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN, 0)) __libc_fatal ("illegal status in __nss_next"); if (nss_next_action (*ni, status) == NSS_ACTION_RETURN) return 1; } if ((*ni)->next == NULL) return -1; do { *ni = (*ni)->next; *fctp = __nss_lookup_function (*ni, fct_name); if (*fctp == NULL && fct2_name != NULL) *fctp = __nss_lookup_function (*ni, fct2_name); } while (*fctp == NULL && nss_next_action (*ni, NSS_STATUS_UNAVAIL) == NSS_ACTION_CONTINUE && (*ni)->next != NULL); return *fctp != NULL ? 0 : -1; }
static int internal_getgrouplist (const char *user, gid_t group, long int *size, gid_t **groupsp, long int limit) { #ifdef USE_NSCD if (__nss_not_use_nscd_group > 0 && ++__nss_not_use_nscd_group > NSS_NSCD_RETRY) __nss_not_use_nscd_group = 0; if (!__nss_not_use_nscd_group && !__nss_database_custom[NSS_DBSIDX_group]) { int n = __nscd_getgrouplist (user, group, size, groupsp, limit); if (n >= 0) return n; /* nscd is not usable. */ __nss_not_use_nscd_group = 1; } #endif enum nss_status status = NSS_STATUS_UNAVAIL; int no_more = 0; /* Never store more than the starting *SIZE number of elements. */ assert (*size > 0); (*groupsp)[0] = group; /* Start is one, because we have the first group as parameter. */ long int start = 1; if (__nss_initgroups_database == NULL) { if (__nss_database_lookup ("initgroups", NULL, "", &__nss_initgroups_database) < 0) { if (__nss_group_database == NULL) no_more = __nss_database_lookup ("group", NULL, "compat files", &__nss_group_database); __nss_initgroups_database = __nss_group_database; } else use_initgroups_entry = true; } else /* __nss_initgroups_database might have been set through __nss_configure_lookup in which case use_initgroups_entry was not set here. */ use_initgroups_entry = __nss_initgroups_database != __nss_group_database; service_user *nip = __nss_initgroups_database; while (! no_more) { long int prev_start = start; initgroups_dyn_function fct = __nss_lookup_function (nip, "initgroups_dyn"); if (fct == NULL) status = compat_call (nip, user, group, &start, size, groupsp, limit, &errno); else status = DL_CALL_FCT (fct, (user, group, &start, size, groupsp, limit, &errno)); /* Remove duplicates. */ long int cnt = prev_start; while (cnt < start) { long int inner; for (inner = 0; inner < prev_start; ++inner) if ((*groupsp)[inner] == (*groupsp)[cnt]) break; if (inner < prev_start) (*groupsp)[cnt] = (*groupsp)[--start]; else ++cnt; } /* This is really only for debugging. */ if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN) __libc_fatal ("illegal status in internal_getgrouplist"); /* For compatibility reason we will continue to look for more entries using the next service even though data has already been found if the nsswitch.conf file contained only a 'groups' line and no 'initgroups' line. If the latter is available we always respect the status. This means that the default for successful lookups is to return. */ if ((use_initgroups_entry || status != NSS_STATUS_SUCCESS) && nss_next_action (nip, status) == NSS_ACTION_RETURN) break; if (nip->next == NULL) no_more = -1; else nip = nip->next; } return start; }