AD: Move storing sdap_domain for subdomain to generic LDAP code

Makes creating the sdap_domain structure for a subdomain reusable
outside AD subdomain code where it was created initially.

Subtask of:
    https://fedorahosted.org/sssd/ticket/1962

3 files changed, 78 insertions, 65 deletions

diff --git a/src/providers/ad/ad_subdomains.c b/src/providers/ad/ad_subdomains.c
index 724d0736..be4781cc 100644
--- a/src/providers/ad/ad_subdomains.c
+++ b/src/providers/ad/ad_subdomains.c
@@ -89,71 +89,7 @@ static errno_t
 ads_store_sdap_subdom(struct ad_subdomains_ctx *ctx,
                       struct sss_domain_info *parent)
 {
-    struct sss_domain_info *dom;
-    struct sdap_domain *sdom, *sditer;
-    char *basedn;
-    errno_t ret;
-
-    for (dom = get_next_domain(parent, true);
-         dom && IS_SUBDOMAIN(dom); /* if we get back to a parent, stop */
-         dom = get_next_domain(dom, false)) {
-
-        DLIST_FOR_EACH(sditer, ctx->sdom) {
-            if (sditer->dom == dom) {
-                break;
-            }
-        }
-
-        if (sditer == NULL) {
-            /* New sdap domain */
-            DEBUG(SSSDBG_TRACE_FUNC, ("subdomain %s is a new one, will "
-                  "create a new sdap domain object\n", dom->name));
-
-            ret = sdap_domain_add(ctx->sdap_id_ctx->opts, dom, &sdom);
-            if (ret != EOK) {
-                DEBUG(SSSDBG_OP_FAILURE,
-                    ("Cannot add new sdap domain for domain %s [%d]: %s\n",
-                    parent->name, ret, strerror(ret)));
-                return ret;
-            }
-            sditer = sdom;
-        }
-
-        /* Convert the domain name into search base */
-        ret = domain_to_basedn(sditer, sditer->dom->name, &basedn);
-        if (ret != EOK) {
-            DEBUG(SSSDBG_OP_FAILURE,
-                ("Cannot convert domain name [%s] to base DN [%d]: %s\n",
-                dom->name, ret, strerror(ret)));
-            talloc_free(basedn);
-            return ret;
-        }
-
-        /* Update search bases */
-        talloc_zfree(sdom->search_bases);
-        sdom->search_bases = talloc_array(sdom, struct sdap_search_base *, 2);
-        if (sdom->search_bases == NULL) {
-            return ret;
-        }
-        sdom->search_bases[1] = NULL;
-
-        ret = sdap_create_search_base(sdom, basedn, LDAP_SCOPE_SUBTREE, NULL,
-                                      &sdom->search_bases[0]);
-        talloc_free(basedn);
-        if (ret) {
-            DEBUG(SSSDBG_OP_FAILURE, ("Cannot create new sdap search base\n"));
-            return ret;
-        }
-
-        sdom->user_search_bases = sdom->search_bases;
-        sdom->group_search_bases = sdom->search_bases;
-        sdom->netgroup_search_bases = sdom->search_bases;
-        sdom->sudo_search_bases = sdom->search_bases;
-        sdom->service_search_bases = sdom->search_bases;
-        sdom->autofs_search_bases = sdom->search_bases;
-    }
-
-    return EOK;
+    return sdap_domain_subdom_add(ctx->sdap_id_ctx, ctx->sdom, parent);
 }
 
 static errno_t
diff --git a/src/providers/ldap/ldap_common.c b/src/providers/ldap/ldap_common.c
index 96edd336..9aa98173 100644
--- a/src/providers/ldap/ldap_common.c
+++ b/src/providers/ldap/ldap_common.c
@@ -94,6 +94,79 @@ sdap_domain_add(struct sdap_options *opts,
     return EOK;
 }
 
+errno_t
+sdap_domain_subdom_add(struct sdap_id_ctx *sdap_id_ctx,
+                       struct sdap_domain *sdom_list,
+                       struct sss_domain_info *parent)
+{
+    struct sss_domain_info *dom;
+    struct sdap_domain *sdom, *sditer;
+    char *basedn;
+    errno_t ret;
+
+    for (dom = get_next_domain(parent, true);
+         dom && IS_SUBDOMAIN(dom); /* if we get back to a parent, stop */
+         dom = get_next_domain(dom, false)) {
+
+        DLIST_FOR_EACH(sditer, sdom_list) {
+            if (sditer->dom == dom) {
+                break;
+            }
+        }
+
+        if (sditer == NULL) {
+            /* New sdap domain */
+            DEBUG(SSSDBG_TRACE_FUNC, ("subdomain %s is a new one, will "
+                  "create a new sdap domain object\n", dom->name));
+
+            ret = sdap_domain_add(sdap_id_ctx->opts, dom, &sdom);
+            if (ret != EOK) {
+                DEBUG(SSSDBG_OP_FAILURE,
+                    ("Cannot add new sdap domain for domain %s [%d]: %s\n",
+                    parent->name, ret, strerror(ret)));
+                return ret;
+            }
+        } else {
+            sdom = sditer;
+        }
+
+        /* Convert the domain name into search base */
+        ret = domain_to_basedn(sdom, sdom->dom->name, &basedn);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE,
+                ("Cannot convert domain name [%s] to base DN [%d]: %s\n",
+                dom->name, ret, strerror(ret)));
+            talloc_free(basedn);
+            return ret;
+        }
+
+        /* Update search bases */
+        talloc_zfree(sdom->search_bases);
+        sdom->search_bases = talloc_array(sdom, struct sdap_search_base *, 2);
+        if (sdom->search_bases == NULL) {
+            return ret;
+        }
+        sdom->search_bases[1] = NULL;
+
+        ret = sdap_create_search_base(sdom, basedn, LDAP_SCOPE_SUBTREE, NULL,
+                                      &sdom->search_bases[0]);
+        talloc_free(basedn);
+        if (ret) {
+            DEBUG(SSSDBG_OP_FAILURE, ("Cannot create new sdap search base\n"));
+            return ret;
+        }
+
+        sdom->user_search_bases = sdom->search_bases;
+        sdom->group_search_bases = sdom->search_bases;
+        sdom->netgroup_search_bases = sdom->search_bases;
+        sdom->sudo_search_bases = sdom->search_bases;
+        sdom->service_search_bases = sdom->search_bases;
+        sdom->autofs_search_bases = sdom->search_bases;
+    }
+
+    return EOK;
+}
+
 void
 sdap_domain_remove(struct sdap_options *opts,
                    struct sss_domain_info *dom)
diff --git a/src/providers/ldap/ldap_common.h b/src/providers/ldap/ldap_common.h
index 7a708301..db2466ad 100644
--- a/src/providers/ldap/ldap_common.h
+++ b/src/providers/ldap/ldap_common.h
@@ -240,6 +240,10 @@ errno_t msgs2attrs_array(TALLOC_CTX *mem_ctx, size_t count,
 errno_t sdap_domain_add(struct sdap_options *opts,
                         struct sss_domain_info *dom,
                         struct sdap_domain **_sdom);
+errno_t
+sdap_domain_subdom_add(struct sdap_id_ctx *sdap_id_ctx,
+                       struct sdap_domain *sdom_list,
+                       struct sss_domain_info *parent);
 
 void
 sdap_domain_remove(struct sdap_options *opts,