RESPONDERS: Add a new request sss_parse_inp_send

The responders were copying code to parse input and on encountering an
uknown domain, send the discover subdomain request. This patch adds a
reusable request that can always be called in responders and in case the
name can be parsed, just shortcut.

Reviewed-by: Pavel Březina <pbrezina@redhat.com>

2 files changed, 128 insertions, 0 deletions

diff --git a/src/responder/common/responder.h b/src/responder/common/responder.h
index 479cd4c5e..167f45cb1 100644
--- a/src/responder/common/responder.h
+++ b/src/responder/common/responder.h
@@ -313,4 +313,11 @@ errno_t csv_string_to_uid_array(TALLOC_CTX *mem_ctx, const char *cvs_string,
 
 errno_t check_allowed_uids(uid_t uid, size_t allowed_uids_count,
                            uid_t *allowed_uids);
+
+struct tevent_req *
+sss_parse_inp_send(TALLOC_CTX *mem_ctx, struct resp_ctx *rctx,
+                   const char *rawinp);
+errno_t sss_parse_inp_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+                           char **_name, char **_domname);
+
 #endif /* __SSS_RESPONDER_H__ */
diff --git a/src/responder/common/responder_get_domains.c b/src/responder/common/responder_get_domains.c
index e86767f7c..1dbb9ea81 100644
--- a/src/responder/common/responder_get_domains.c
+++ b/src/responder/common/responder_get_domains.c
@@ -411,3 +411,124 @@ errno_t schedule_get_domains_task(TALLOC_CTX *mem_ctx,
 
     return EOK;
 }
+
+struct sss_parse_inp_state {
+    struct resp_ctx *rctx;
+    const char *rawinp;
+
+    char *name;
+    char *domname;
+};
+
+static void sss_parse_inp_done(struct tevent_req *subreq);
+
+struct tevent_req *
+sss_parse_inp_send(TALLOC_CTX *mem_ctx, struct resp_ctx *rctx,
+                   const char *rawinp)
+{
+    errno_t ret;
+    struct tevent_req *req;
+    struct tevent_req *subreq;
+    struct sss_parse_inp_state *state;
+
+    req = tevent_req_create(mem_ctx, &state, struct sss_parse_inp_state);
+    if (req == NULL) {
+         return NULL;
+    }
+    state->rawinp = rawinp;
+    state->rctx = rctx;
+
+    /* If the subdomains haven't been checked yet, we need to always
+     * attach to the post-startup subdomain request and only then parse
+     * the input. Otherwise, we might not be able to parse input with a
+     * flat domain name specifier */
+    if (rctx->get_domains_last_call.tv_sec > 0) {
+        ret = sss_parse_name_for_domains(state, rctx->domains,
+                                         rctx->default_domain, rawinp,
+                                         &state->domname, &state->name);
+        if (ret == EOK) {
+            /* Was able to use cached domains */
+            goto done;
+        } else if (ret != EAGAIN) {
+            DEBUG(SSSDBG_OP_FAILURE, "Invalid name received [%s]\n", rawinp);
+            ret = ERR_INPUT_PARSE;
+            goto done;
+        }
+    }
+
+    /* EAGAIN - check the DP for subdomains */
+
+    DEBUG(SSSDBG_FUNC_DATA, "Requesting info for [%s] from [%s]\n",
+          state->name, state->domname ? state->domname : "<ALL>");
+
+    /* We explicitly use force=false here. This request should decide itself
+     * if it's time to re-use the cached subdomain list or refresh. If the
+     * caller needs to specify the 'force' parameter, they should use the
+     * sss_dp_get_domains_send() request itself
+     */
+    subreq = sss_dp_get_domains_send(state, rctx, false, state->domname);
+    if (subreq == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+    tevent_req_set_callback(subreq, sss_parse_inp_done, req);
+    return req;
+
+done:
+    if (ret == EOK) {
+        tevent_req_done(req);
+    } else {
+        tevent_req_error(req, ret);
+    }
+    tevent_req_post(req, rctx->ev);
+    return req;
+}
+
+static void sss_parse_inp_done(struct tevent_req *subreq)
+{
+    errno_t ret;
+    struct tevent_req *req = tevent_req_callback_data(subreq,
+                                                      struct tevent_req);
+    struct sss_parse_inp_state *state = tevent_req_data(req,
+                                                struct sss_parse_inp_state);
+
+    ret = sss_dp_get_domains_recv(subreq);
+    talloc_free(subreq);
+    if (ret != EOK) {
+        tevent_req_error(req, ret);
+        return;
+    }
+
+    ret = sss_parse_name_for_domains(state, state->rctx->domains,
+                                     state->rctx->default_domain,
+                                     state->rawinp,
+                                     &state->domname, &state->name);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE,
+              "Invalid name received [%s]\n", state->rawinp);
+        tevent_req_error(req, ERR_INPUT_PARSE);
+        return;
+    }
+
+    /* Was able to parse the name now */
+    tevent_req_done(req);
+}
+
+errno_t sss_parse_inp_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+                           char **_name, char **_domname)
+{
+    struct sss_parse_inp_state *state = tevent_req_data(req,
+                                                struct sss_parse_inp_state);
+
+    TEVENT_REQ_RETURN_ON_ERROR(req);
+
+    if (_name) {
+        *_name = talloc_steal(mem_ctx, state->name);
+    }
+
+    if (_domname) {
+        *_domname = talloc_steal(mem_ctx, state->domname);
+    }
+
+    return EOK;
+}