Convert IPA-specific options to be back-end agnostic

This patch introduces new options for dynamic DNS updates that are not
specific to any back end. The current ipa dyndns options are still
usable, just with a deprecation warning.

7 files changed, 204 insertions, 28 deletions

diff --git a/src/providers/dp_dyndns.c b/src/providers/dp_dyndns.c
index 7e5cc690..81228d5c 100644
--- a/src/providers/dp_dyndns.c
+++ b/src/providers/dp_dyndns.c
@@ -878,3 +878,60 @@ be_nsupdate_recv(struct tevent_req *req, int *child_status)
 
     return EOK;
 }
+
+errno_t
+be_nsupdate_check(void)
+{
+    errno_t ret;
+    struct stat stat_buf;
+
+    /* Ensure that nsupdate exists */
+    errno = 0;
+    ret = stat(NSUPDATE_PATH, &stat_buf);
+    if (ret == -1) {
+        ret = errno;
+        if (ret == ENOENT) {
+            DEBUG(SSSDBG_MINOR_FAILURE,
+                  ("%s does not exist. Dynamic DNS updates disabled\n",
+                  NSUPDATE_PATH));
+        } else {
+            DEBUG(SSSDBG_OP_FAILURE,
+                  ("Could not set up dynamic DNS updates: [%d][%s]\n",
+                  ret, strerror(ret)));
+        }
+    }
+
+    return ret;
+}
+
+static struct dp_option default_dyndns_opts[] = {
+    { "dyndns_update", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE },
+    { "dyndns_iface", DP_OPT_STRING, NULL_STRING, NULL_STRING },
+    { "dyndns_ttl", DP_OPT_NUMBER, { .number = 1200 }, NULL_NUMBER },
+
+    DP_OPTION_TERMINATOR
+};
+
+errno_t
+be_nsupdate_init(TALLOC_CTX *mem_ctx, struct be_ctx *be_ctx,
+                 struct dp_option *defopts, struct be_nsupdate_ctx **_ctx)
+{
+    errno_t ret;
+    struct dp_option *src_opts;
+    struct be_nsupdate_ctx *ctx;
+
+    ctx = talloc(mem_ctx, struct be_nsupdate_ctx);
+    if (ctx == NULL) return ENOMEM;
+
+    src_opts = defopts ? defopts : default_dyndns_opts;
+
+    ret = dp_get_options(ctx, be_ctx->cdb, be_ctx->conf_path,
+                         src_opts, DP_OPT_DYNDNS, &ctx->opts);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, ("Cannot retrieve dynamic DNS options\n"));
+        return ret;
+    }
+
+    *_ctx = ctx;
+    return EOK;
+}
diff --git a/src/providers/dp_dyndns.h b/src/providers/dp_dyndns.h
index b0020560..95403a3a 100644
--- a/src/providers/dp_dyndns.h
+++ b/src/providers/dp_dyndns.h
@@ -22,12 +22,34 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+
+#ifndef DP_DYNDNS_H_
+#define DP_DYNDNS_H_
+
 /* dynamic dns helpers */
 struct sss_iface_addr;
 
+struct be_nsupdate_ctx {
+    struct dp_option *opts;
+};
+
+enum dp_dyndns_opts {
+    DP_OPT_DYNDNS_UPDATE,
+    DP_OPT_DYNDNS_IFACE,
+    DP_OPT_DYNDNS_TTL,
+
+    DP_OPT_DYNDNS /* attrs counter */
+};
+
 #define DYNDNS_REMOVE_A     0x1
 #define DYNDNS_REMOVE_AAAA  0x2
 
+errno_t be_nsupdate_check(void);
+
+errno_t
+be_nsupdate_init(TALLOC_CTX *mem_ctx, struct be_ctx *be_ctx,
+                 struct dp_option *defopts, struct be_nsupdate_ctx **ctx);
+
 errno_t
 sss_iface_addr_list_get(TALLOC_CTX *mem_ctx, const char *ifname,
                         struct sss_iface_addr **_addrlist);
@@ -66,3 +88,5 @@ struct tevent_req * nsupdate_get_addrs_send(TALLOC_CTX *mem_ctx,
 errno_t nsupdate_get_addrs_recv(struct tevent_req *req,
                                 TALLOC_CTX *mem_ctx,
                                 char ***_addrlist);
+
+#endif /* DP_DYNDNS_H_ */
diff --git a/src/providers/ipa/ipa_common.c b/src/providers/ipa/ipa_common.c
index be1bd1d2..51750b2a 100644
--- a/src/providers/ipa/ipa_common.c
+++ b/src/providers/ipa/ipa_common.c
@@ -29,6 +29,7 @@
 #include "db/sysdb_selinux.h"
 #include "providers/ipa/ipa_common.h"
 #include "providers/ldap/sdap_async_private.h"
+#include "providers/dp_dyndns.h"
 #include "util/sss_krb5.h"
 #include "db/sysdb_services.h"
 #include "db/sysdb_autofs.h"
@@ -1008,3 +1009,98 @@ done:
     talloc_free(tmp_ctx);
     return ret;
 }
+
+errno_t ipa_get_dyndns_options(struct be_ctx *be_ctx,
+                               struct ipa_options *ctx)
+{
+    errno_t ret;
+    char *val;
+    bool update;
+    int ttl;
+
+    ret = be_nsupdate_init(ctx, be_ctx, ipa_dyndns_opts, &ctx->dyndns_ctx);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE,
+              ("Cannot initialize IPA dyndns opts [%d]: %s\n",
+               ret, sss_strerror(ret)));
+        return ret;
+    }
+
+    if (ctx->basic == NULL) {
+        DEBUG(SSSDBG_MINOR_FAILURE, ("IPA basic options not (yet) "
+              "initialized, cannot copy legacy options\n"));
+        return EOK;
+    }
+
+    /* Reuse legacy option values */
+    ret = confdb_get_string(be_ctx->cdb, ctx, be_ctx->conf_path,
+                            "ipa_dyndns_update", NULL, &val);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, ("Cannot get the value of %s\n",
+              "ipa_dyndns_update"));
+        /* Not fatal */
+    } else if (ret == EOK && val) {
+        if (strcasecmp(val, "FALSE") == 0) {
+            update = false;
+        } else if (strcasecmp(val, "TRUE") == 0) {
+            update = true;
+        } else {
+            DEBUG(SSSDBG_MINOR_FAILURE,
+                  ("ipa_dyndns_update value is not a boolean!\n"));
+            talloc_free(val);
+            return EINVAL;
+        }
+
+        DEBUG(SSSDBG_MINOR_FAILURE, ("Deprecation warning: The option %s is "
+              "deprecated and should not be used in favor of %s\n",
+              "ipa_dyndns_update", "dyndns_update"));
+
+        ret = dp_opt_set_bool(ctx->dyndns_ctx->opts,
+                              DP_OPT_DYNDNS_UPDATE, update);
+        talloc_free(val);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE, ("Cannot set option value\n"));
+            return ret;
+        }
+    }
+
+    ret = confdb_get_int(be_ctx->cdb, be_ctx->conf_path,
+                         "ipa_dyndns_ttl", -1, &ttl);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, ("Cannot get the value of %s\n",
+              "ipa_dyndns_ttl"));
+        /* Not fatal */
+    } else if (ret == EOK && ttl != -1) {
+        DEBUG(SSSDBG_MINOR_FAILURE, ("Deprecation warning: The option %s is "
+              "deprecated and should not be used in favor of %s\n",
+              "ipa_dyndns_ttl", "dyndns_ttl"));
+
+        ret = dp_opt_set_int(ctx->dyndns_ctx->opts, DP_OPT_DYNDNS_TTL, ttl);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE, ("Cannot set option value\n"));
+            return ret;
+        }
+    }
+
+    /* Reuse legacy option values */
+    ret = confdb_get_string(be_ctx->cdb, ctx, be_ctx->conf_path,
+                            "ipa_dyndns_iface", NULL, &val);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_OP_FAILURE, ("Cannot get the value of %s\n",
+              "ipa_dyndns_iface"));
+        /* Not fatal */
+    } else if (ret == EOK && val) {
+        DEBUG(SSSDBG_MINOR_FAILURE, ("Deprecation warning: The option %s is "
+              "deprecated and should not be used in favor of %s\n",
+              "ipa_dyndns_iface", "dyndns_iface"));
+
+        ret = dp_opt_set_string(ctx->dyndns_ctx->opts,
+                                DP_OPT_DYNDNS_IFACE, val);
+        if (ret != EOK) {
+            DEBUG(SSSDBG_OP_FAILURE, ("Cannot set option value\n"));
+            return ret;
+        }
+    }
+
+    return EOK;
+}
diff --git a/src/providers/ipa/ipa_common.h b/src/providers/ipa/ipa_common.h
index 6e77c997..a32867dd 100644
--- a/src/providers/ipa/ipa_common.h
+++ b/src/providers/ipa/ipa_common.h
@@ -37,9 +37,6 @@ enum ipa_basic_opt {
     IPA_SERVER,
     IPA_BACKUP_SERVER,
     IPA_HOSTNAME,
-    IPA_DYNDNS_UPDATE,
-    IPA_DYNDNS_TTL,
-    IPA_DYNDNS_IFACE,
     IPA_HBAC_SEARCH_BASE,
     IPA_HOST_SEARCH_BASE,
     IPA_SELINUX_SEARCH_BASE,
@@ -139,6 +136,7 @@ struct ipa_options {
     struct sdap_options *id;
     struct ipa_id_ctx *id_ctx;
     struct be_resolv_ctx *be_res;
+    struct be_nsupdate_ctx *dyndns_ctx;
 
     /* auth and chpass provider */
     struct dp_option *auth;
@@ -169,6 +167,9 @@ int ipa_get_autofs_options(struct ipa_options *ipa_opts,
                            const char *conf_path,
                            struct sdap_options **_opts);
 
+errno_t ipa_get_dyndns_options(struct be_ctx *be_ctx,
+                               struct ipa_options *ctx);
+
 int ipa_autofs_init(struct be_ctx *be_ctx,
                     struct ipa_id_ctx *id_ctx,
                     struct bet_ops **ops,
diff --git a/src/providers/ipa/ipa_dyndns.c b/src/providers/ipa/ipa_dyndns.c
index 79918a26..8023b533 100644
--- a/src/providers/ipa/ipa_dyndns.c
+++ b/src/providers/ipa/ipa_dyndns.c
@@ -28,6 +28,7 @@
 #include "providers/ipa/ipa_common.h"
 #include "providers/ipa/ipa_dyndns.h"
 #include "providers/data_provider.h"
+#include "providers/dp_dyndns.h"
 
 void ipa_dyndns_update(void *pvt);
 
@@ -135,16 +136,16 @@ ipa_dyndns_update_send(struct ipa_options *ctx)
 
     subreq = sdap_dyndns_update_send(state, sdap_ctx->be->ev,
                                      sdap_ctx->be, sdap_ctx,
-                                     dp_opt_get_string(ctx->basic,
-                                                       IPA_DYNDNS_IFACE),
+                                     dp_opt_get_string(ctx->dyndns_ctx->opts,
+                                                       DP_OPT_DYNDNS_IFACE),
                                      dp_opt_get_string(ctx->basic,
                                                        IPA_HOSTNAME),
                                      dns_zone,
                                      dp_opt_get_string(ctx->basic,
                                                        IPA_KRB5_REALM),
                                      servername,
-                                     dp_opt_get_int(ctx->basic,
-                                                    IPA_DYNDNS_TTL),
+                                     dp_opt_get_int(ctx->dyndns_ctx->opts,
+                                                    DP_OPT_DYNDNS_TTL),
                                      true);
     if (!subreq) {
         ret = EIO;
diff --git a/src/providers/ipa/ipa_init.c b/src/providers/ipa/ipa_init.c
index 0e9fe0dd..5192bc81 100644
--- a/src/providers/ipa/ipa_init.c
+++ b/src/providers/ipa/ipa_init.c
@@ -40,6 +40,7 @@
 #include "providers/ldap/sdap_access.h"
 #include "providers/ipa/ipa_subdomains.h"
 #include "providers/ipa/ipa_srv.h"
+#include "providers/dp_dyndns.h"
 
 struct ipa_options *ipa_options = NULL;
 
@@ -110,11 +111,9 @@ int sssm_ipa_id_init(struct be_ctx *bectx,
 {
     struct ipa_id_ctx *ipa_ctx;
     struct sdap_id_ctx *sdap_ctx;
-    struct stat stat_buf;
     const char *hostname;
     const char *ipa_domain;
     struct ipa_srv_plugin_ctx *srv_ctx;
-    errno_t err;
     int ret;
 
     if (!ipa_options) {
@@ -153,7 +152,12 @@ int sssm_ipa_id_init(struct be_ctx *bectx,
         goto done;
     }
 
-    if(dp_opt_get_bool(ipa_options->basic, IPA_DYNDNS_UPDATE)) {
+    ret = ipa_get_dyndns_options(bectx, ipa_options);
+    if (ret != EOK) {
+        goto done;
+    }
+
+    if (dp_opt_get_bool(ipa_options->dyndns_ctx->opts, DP_OPT_DYNDNS_UPDATE)) {
         /* Perform automatic DNS updates when the
          * IP address changes.
          * Register a callback for successful LDAP
@@ -161,21 +165,10 @@ int sssm_ipa_id_init(struct be_ctx *bectx,
          * identify that we have gone online.
          */
 
-        /* Ensure that nsupdate exists */
-        errno = 0;
-        ret = stat(NSUPDATE_PATH, &stat_buf);
-        if (ret == -1) {
-            err = errno;
-            if (err == ENOENT) {
-                DEBUG(0, ("%s does not exist. Dynamic DNS updates disabled\n",
-                          NSUPDATE_PATH));
-            }
-            else {
-                DEBUG(0, ("Could not set up dynamic DNS updates: [%d][%s]\n",
-                          err, strerror(err)));
-            }
-        }
-        else {
+        DEBUG(SSSDBG_CONF_SETTINGS,
+              ("Dynamic DNS updates are on. Checking for nsupdate..\n"));
+        ret = be_nsupdate_check();
+        if (ret == EOK) {
             /* nsupdate is available. Dynamic updates
              * are supported
              */
diff --git a/src/providers/ipa/ipa_opts.h b/src/providers/ipa/ipa_opts.h
index 6adbdd96..392fcd86 100644
--- a/src/providers/ipa/ipa_opts.h
+++ b/src/providers/ipa/ipa_opts.h
@@ -35,9 +35,6 @@ struct dp_option ipa_basic_opts[] = {
     { "ipa_server", DP_OPT_STRING, NULL_STRING, NULL_STRING },
     { "ipa_backup_server", DP_OPT_STRING, NULL_STRING, NULL_STRING },
     { "ipa_hostname", DP_OPT_STRING, NULL_STRING, NULL_STRING },
-    { "ipa_dyndns_update", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE },
-    { "ipa_dyndns_ttl", DP_OPT_NUMBER, { .number = 1200}, NULL_NUMBER},
-    { "ipa_dyndns_iface", DP_OPT_STRING, NULL_STRING, NULL_STRING},
     { "ipa_hbac_search_base", DP_OPT_STRING, NULL_STRING, NULL_STRING},
     { "ipa_host_search_base", DP_OPT_STRING, NULL_STRING, NULL_STRING },
     { "ipa_selinux_search_base", DP_OPT_STRING, NULL_STRING, NULL_STRING },
@@ -54,6 +51,13 @@ struct dp_option ipa_basic_opts[] = {
     DP_OPTION_TERMINATOR
 };
 
+struct dp_option ipa_dyndns_opts[] = {
+    { "dyndns_update", DP_OPT_BOOL, BOOL_FALSE, BOOL_FALSE },
+    { "dyndns_iface", DP_OPT_STRING, NULL_STRING, NULL_STRING },
+    { "dyndns_ttl", DP_OPT_NUMBER, { .number = 1200 }, NULL_NUMBER },
+    DP_OPTION_TERMINATOR
+};
+
 struct dp_option ipa_def_ldap_opts[] = {
     { "ldap_uri", DP_OPT_STRING, NULL_STRING, NULL_STRING },
     { "ldap_backup_uri", DP_OPT_STRING, NULL_STRING, NULL_STRING },