DNS sites support - use SRV DNS lookup plugin in all providers

https://fedorahosted.org/sssd/ticket/1032

We set a plugin during an initialization of ID provider, which
is an authoritative provider for a plugin choice. The plugin is
set only once. When other provider is initalized (e.g. id = IPA,
sudo = LDAP), we do not overwrite the plugin.

Since sssm_*_id_init() is called from all module constructors,
this patch relies on the fact, that ID provider is initialized
before all other providers.

3 files changed, 29 insertions, 0 deletions

diff --git a/src/providers/ad/ad_init.c b/src/providers/ad/ad_init.c
index 2add74a20..087ec3c45 100644
--- a/src/providers/ad/ad_init.c
+++ b/src/providers/ad/ad_init.c
@@ -107,6 +107,7 @@ sssm_ad_id_init(struct be_ctx *bectx,
     errno_t ret;
     struct ad_id_ctx *ad_ctx;
     struct sdap_id_ctx *sdap_ctx;
+    const char *hostname;
 
     if (!ad_options) {
         ret = common_ad_init(bectx);
@@ -175,6 +176,15 @@ sssm_ad_id_init(struct be_ctx *bectx,
         goto done;
     }
 
+    /* setup SRV lookup plugin */
+    hostname = dp_opt_get_string(ad_options->basic, AD_HOSTNAME);
+    ret = be_fo_set_dns_srv_lookup_plugin(bectx, hostname);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to set SRV lookup plugin "
+                                    "[%d]: %s\n", ret, strerror(ret)));
+        goto done;
+    }
+
     *ops = &ad_id_ops;
     *pvt_data = ad_ctx;
 
diff --git a/src/providers/ipa/ipa_init.c b/src/providers/ipa/ipa_init.c
index a6c32be2a..cdca706da 100644
--- a/src/providers/ipa/ipa_init.c
+++ b/src/providers/ipa/ipa_init.c
@@ -110,6 +110,7 @@ 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;
     errno_t err;
     int ret;
 
@@ -207,6 +208,15 @@ int sssm_ipa_id_init(struct be_ctx *bectx,
         goto done;
     }
 
+    /* setup SRV lookup plugin */
+    hostname = dp_opt_get_string(ipa_options->basic, IPA_HOSTNAME);
+    ret = be_fo_set_dns_srv_lookup_plugin(bectx, hostname);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to set SRV lookup plugin "
+                                    "[%d]: %s\n", ret, strerror(ret)));
+        goto done;
+    }
+
     *ops = &ipa_id_ops;
     *pvt_data = ipa_ctx;
     ret = EOK;
diff --git a/src/providers/ldap/ldap_init.c b/src/providers/ldap/ldap_init.c
index fa888ba7d..2e30c37ed 100644
--- a/src/providers/ldap/ldap_init.c
+++ b/src/providers/ldap/ldap_init.c
@@ -29,6 +29,7 @@
 #include "providers/ldap/sdap_sudo.h"
 #include "providers/ldap/sdap_autofs.h"
 #include "providers/ldap/sdap_idmap.h"
+#include "providers/fail_over_srv.h"
 
 static void sdap_shutdown(struct be_req *req);
 
@@ -172,6 +173,14 @@ int sssm_ldap_id_init(struct be_ctx *bectx,
         goto done;
     }
 
+    /* setup SRV lookup plugin */
+    ret = be_fo_set_dns_srv_lookup_plugin(bectx, NULL);
+    if (ret != EOK) {
+        DEBUG(SSSDBG_CRIT_FAILURE, ("Unable to set SRV lookup plugin "
+                                    "[%d]: %s\n", ret, strerror(ret)));
+        goto done;
+    }
+
     *ops = &sdap_id_ops;
     *pvt_data = ctx;
     ret = EOK;