LDAP: Split out a request to search for a user w/o saving

Related:
https://fedorahosted.org/sssd/ticket/2077

Certain situations require that a user entry is downloaded for further
inpection, but not saved to the sysdb right away. This patch splits the
previously monolithic request into one that just downloads the data and
one that uses the new one to download and save the user.

2 files changed, 147 insertions, 33 deletions

diff --git a/src/providers/ldap/sdap_async.h b/src/providers/ldap/sdap_async.h
index c8031c9a9..dbf572cdc 100644
--- a/src/providers/ldap/sdap_async.h
+++ b/src/providers/ldap/sdap_async.h
@@ -58,6 +58,22 @@ errno_t sdap_connect_host_recv(TALLOC_CTX *mem_ctx,
                                struct tevent_req *req,
                                struct sdap_handle **_sh);
 
+/* Search users in LDAP, return them as attrs */
+struct tevent_req *sdap_search_user_send(TALLOC_CTX *memctx,
+                                         struct tevent_context *ev,
+                                         struct sss_domain_info *dom,
+                                         struct sdap_options *opts,
+                                         struct sdap_search_base **search_bases,
+                                         struct sdap_handle *sh,
+                                         const char **attrs,
+                                         const char *filter,
+                                         int timeout,
+                                         bool enumeration);
+int sdap_search_user_recv(TALLOC_CTX *memctx, struct tevent_req *req,
+                          char **higher_usn, struct sysdb_attrs ***users,
+                          size_t *count);
+
+/* Search users in LDAP using the request above, save them to cache */
 struct tevent_req *sdap_get_users_send(TALLOC_CTX *memctx,
                                        struct tevent_context *ev,
                                        struct sss_domain_info *dom,
diff --git a/src/providers/ldap/sdap_async_users.c b/src/providers/ldap/sdap_async_users.c
index 9cfe21748..7f0b2eea0 100644
--- a/src/providers/ldap/sdap_async_users.c
+++ b/src/providers/ldap/sdap_async_users.c
@@ -579,15 +579,15 @@ done:
 
 /* ==Search-Users-with-filter============================================= */
 
-struct sdap_get_users_state {
+struct sdap_search_user_state {
     struct tevent_context *ev;
     struct sdap_options *opts;
     struct sdap_handle *sh;
     struct sss_domain_info *dom;
-    struct sysdb_ctx *sysdb;
+
     const char **attrs;
     const char *base_filter;
-    char *filter;
+    const char *filter;
     int timeout;
     bool enumeration;
 
@@ -599,33 +599,31 @@ struct sdap_get_users_state {
     struct sdap_search_base **search_bases;
 };
 
-static errno_t sdap_get_users_next_base(struct tevent_req *req);
-static void sdap_get_users_process(struct tevent_req *subreq);
-
-struct tevent_req *sdap_get_users_send(TALLOC_CTX *memctx,
-                                       struct tevent_context *ev,
-                                       struct sss_domain_info *dom,
-                                       struct sysdb_ctx *sysdb,
-                                       struct sdap_options *opts,
-                                       struct sdap_search_base **search_bases,
-                                       struct sdap_handle *sh,
-                                       const char **attrs,
-                                       const char *filter,
-                                       int timeout,
-                                       bool enumeration)
+static errno_t sdap_search_user_next_base(struct tevent_req *req);
+static void sdap_search_user_process(struct tevent_req *subreq);
+
+struct tevent_req *sdap_search_user_send(TALLOC_CTX *memctx,
+                                         struct tevent_context *ev,
+                                         struct sss_domain_info *dom,
+                                         struct sdap_options *opts,
+                                         struct sdap_search_base **search_bases,
+                                         struct sdap_handle *sh,
+                                         const char **attrs,
+                                         const char *filter,
+                                         int timeout,
+                                         bool enumeration)
 {
     errno_t ret;
     struct tevent_req *req;
-    struct sdap_get_users_state *state;
+    struct sdap_search_user_state *state;
 
-    req = tevent_req_create(memctx, &state, struct sdap_get_users_state);
-    if (!req) return NULL;
+    req = tevent_req_create(memctx, &state, struct sdap_search_user_state);
+    if (req == NULL) return NULL;
 
     state->ev = ev;
     state->opts = opts;
     state->dom = dom;
     state->sh = sh;
-    state->sysdb = sysdb;
     state->attrs = attrs;
     state->higher_usn = NULL;
     state->users =  NULL;
@@ -643,7 +641,7 @@ struct tevent_req *sdap_get_users_send(TALLOC_CTX *memctx,
         goto done;
     }
 
-    ret = sdap_get_users_next_base(req);
+    ret = sdap_search_user_next_base(req);
 
 done:
     if (ret != EOK) {
@@ -654,18 +652,18 @@ done:
     return req;
 }
 
-static errno_t sdap_get_users_next_base(struct tevent_req *req)
+static errno_t sdap_search_user_next_base(struct tevent_req *req)
 {
     struct tevent_req *subreq;
-    struct sdap_get_users_state *state;
+    struct sdap_search_user_state *state;
 
-    state = tevent_req_data(req, struct sdap_get_users_state);
+    state = tevent_req_data(req, struct sdap_search_user_state);
 
     talloc_zfree(state->filter);
     state->filter = sdap_get_id_specific_filter(state,
                         state->base_filter,
                         state->search_bases[state->base_iter]->filter);
-    if (!state->filter) {
+    if (state->filter == NULL) {
         return ENOMEM;
     }
 
@@ -681,20 +679,20 @@ static errno_t sdap_get_users_next_base(struct tevent_req *req)
             state->opts->user_map, SDAP_OPTS_USER,
             state->timeout,
             state->enumeration); /* If we're enumerating, we need paging */
-    if (!subreq) {
+    if (subreq == NULL) {
         return ENOMEM;
     }
-    tevent_req_set_callback(subreq, sdap_get_users_process, req);
+    tevent_req_set_callback(subreq, sdap_search_user_process, req);
 
     return EOK;
 }
 
-static void sdap_get_users_process(struct tevent_req *subreq)
+static void sdap_search_user_process(struct tevent_req *subreq)
 {
     struct tevent_req *req = tevent_req_callback_data(subreq,
                                                       struct tevent_req);
-    struct sdap_get_users_state *state = tevent_req_data(req,
-                                            struct sdap_get_users_state);
+    struct sdap_search_user_state *state = tevent_req_data(req,
+                                            struct sdap_search_user_state);
     int ret;
     size_t count, i;
     struct sysdb_attrs **users;
@@ -744,7 +742,7 @@ static void sdap_get_users_process(struct tevent_req *subreq)
         state->base_iter++;
         if (state->search_bases[state->base_iter]) {
             /* There are more search bases to try */
-            ret = sdap_get_users_next_base(req);
+            ret = sdap_search_user_next_base(req);
             if (ret != EOK) {
                 tevent_req_error(req, ret);
             }
@@ -760,12 +758,112 @@ static void sdap_get_users_process(struct tevent_req *subreq)
         return;
     }
 
+    DEBUG(SSSDBG_TRACE_ALL, ("Retrieved total %zu users\n", state->count));
+    tevent_req_done(req);
+}
+
+
+int sdap_search_user_recv(TALLOC_CTX *memctx, struct tevent_req *req,
+                          char **higher_usn, struct sysdb_attrs ***users,
+                          size_t *count)
+{
+    struct sdap_search_user_state *state = tevent_req_data(req,
+                                            struct sdap_search_user_state);
+
+    if (higher_usn) {
+        *higher_usn = talloc_steal(memctx, state->higher_usn);
+    }
+
+    if (users) {
+        *users = talloc_steal(memctx, state->users);
+    }
+
+    if (count) {
+        *count = state->count;
+    }
+
+    TEVENT_REQ_RETURN_ON_ERROR(req);
+
+    return EOK;
+}
+
+/* ==Search-And-Save-Users-with-filter============================================= */
+struct sdap_get_users_state {
+    struct sysdb_ctx *sysdb;
+    struct sdap_options *opts;
+    struct sss_domain_info *dom;
+
+    char *higher_usn;
+    struct sysdb_attrs **users;
+    size_t count;
+};
+
+static void sdap_get_users_done(struct tevent_req *subreq);
+
+struct tevent_req *sdap_get_users_send(TALLOC_CTX *memctx,
+                                       struct tevent_context *ev,
+                                       struct sss_domain_info *dom,
+                                       struct sysdb_ctx *sysdb,
+                                       struct sdap_options *opts,
+                                       struct sdap_search_base **search_bases,
+                                       struct sdap_handle *sh,
+                                       const char **attrs,
+                                       const char *filter,
+                                       int timeout,
+                                       bool enumeration)
+{
+    errno_t ret;
+    struct tevent_req *req;
+    struct tevent_req *subreq;
+    struct sdap_get_users_state *state;
+
+    req = tevent_req_create(memctx, &state, struct sdap_get_users_state);
+    if (!req) return NULL;
+
+    state->sysdb = sysdb;
+    state->opts = opts;
+    state->dom = dom;
+
+    subreq = sdap_search_user_send(state, ev, dom, opts, search_bases,
+                                   sh, attrs, filter, timeout, enumeration);
+    if (subreq == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+    tevent_req_set_callback(subreq, sdap_get_users_done, req);
+
+    ret = EOK;
+done:
+    if (ret != EOK) {
+        tevent_req_error(req, ret);
+        tevent_req_post(req, ev);
+    }
+
+    return req;
+}
+
+static void sdap_get_users_done(struct tevent_req *subreq)
+{
+    struct tevent_req *req = tevent_req_callback_data(subreq,
+                                                      struct tevent_req);
+    struct sdap_get_users_state *state = tevent_req_data(req,
+                                            struct sdap_get_users_state);
+    int ret;
+
+    ret = sdap_search_user_recv(state, subreq, &state->higher_usn,
+                                &state->users, &state->count);
+    if (ret) {
+        DEBUG(SSSDBG_OP_FAILURE, ("Failed to retrieve users\n"));
+        tevent_req_error(req, ret);
+        return;
+    }
+
     ret = sdap_save_users(state, state->sysdb,
                           state->dom, state->opts,
                           state->users, state->count,
                           &state->higher_usn);
     if (ret) {
-        DEBUG(2, ("Failed to store users.\n"));
+        DEBUG(SSSDBG_OP_FAILURE, ("Failed to store users.\n"));
         tevent_req_error(req, ret);
         return;
     }