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authorPavel Březina <pbrezina@redhat.com>2013-04-08 11:42:56 +0200
committerJakub Hrozek <jhrozek@redhat.com>2013-04-10 15:36:55 +0200
commite26a019fbac96b7697c180124fe1d4894962e3a0 (patch)
tree313b2fd80a2afdd1a0ec3ccf4481c4366aa62bdf /src
parentc65f009dac1f8ca935e572a0812711b91cfbf9bf (diff)
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DNS sites support - replace SRV lookup code with a plugin call
https://fedorahosted.org/sssd/ticket/1032 Removes hard coded SRV lookup code with a plugin call. This patch breaks SRV lookups as there is currently no plugin in use. It is fixed in next patch.
Diffstat (limited to 'src')
-rw-r--r--src/providers/fail_over.c331
1 files changed, 73 insertions, 258 deletions
diff --git a/src/providers/fail_over.c b/src/providers/fail_over.c
index 98040ff0..c30ead2b 100644
--- a/src/providers/fail_over.c
+++ b/src/providers/fail_over.c
@@ -215,21 +215,6 @@ int fo_is_srv_lookup(struct fo_server *s)
return s && s->srv_data;
}
-static char *
-get_srv_query(TALLOC_CTX *mem_ctx, struct fo_server *server)
-{
- char *query;
-
- if (!fo_is_srv_lookup(server)) {
- return NULL;
- }
-
- query = talloc_asprintf(mem_ctx, "_%s._%s.%s", server->srv_data->srv,
- server->srv_data->proto,
- server->srv_data->dns_domain);
- return query;
-}
-
static struct fo_server *
collapse_srv_lookup(struct fo_server *server)
{
@@ -1148,17 +1133,6 @@ fo_resolve_service_recv(struct tevent_req *req, struct fo_server **server)
*******************************************************************/
static void resolve_srv_done(struct tevent_req *subreq);
-static void resolve_srv_cont(struct tevent_req *req);
-
-struct tevent_req *resolve_get_domain_send(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev,
- struct fo_ctx *foctx,
- struct resolv_ctx *resolv);
-
-static void resolve_getsrv_domain_done(struct tevent_req *req);
-int resolve_get_domain_recv(struct tevent_req *req,
- TALLOC_CTX *mem_ctx,
- char **dns_domain);
struct resolve_srv_state {
struct fo_server *meta;
@@ -1203,26 +1177,19 @@ resolve_srv_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
* query collapsed
* */
case SRV_NEUTRAL: /* Request SRV lookup */
- if (state->meta->srv_data->dns_domain == NULL) {
- /* we need to look up our DNS domain first */
- DEBUG(SSSDBG_TRACE_FUNC,
- ("SRV resolution of service '%s'. "
- "dns_discovery_domain not specified. Need to look it up.\n",
- server->service->name));
- subreq = resolve_get_domain_send(state, ev, ctx, resolv);
- if (subreq == NULL) {
- ret = ENOMEM;
- goto done;
- }
- tevent_req_set_callback(subreq, resolve_getsrv_domain_done, req);
- break;
+ if (ctx->srv_send_fn == NULL || ctx->srv_recv_fn == NULL) {
+ DEBUG(SSSDBG_OP_FAILURE, ("No SRV lookup plugin is set\n"));
+ ret = ENOTSUP;
+ goto done;
}
- /* we know the DNS domain, just do the lookup */
- DEBUG(SSSDBG_TRACE_FUNC,
- ("SRV resolution of service '%s'. "
- "Will use DNS discovery domain '%s'\n",
- server->service->name, state->meta->srv_data->dns_domain));
- resolve_srv_cont(req);
+
+ subreq = ctx->srv_send_fn(state, ev,
+ server->srv_data->srv,
+ server->srv_data->proto,
+ server->srv_data->discovery_domain,
+ ctx->srv_pvt);
+
+ tevent_req_set_callback(subreq, resolve_srv_done, req);
break;
case SRV_RESOLVE_ERROR: /* query could not be resolved but don't retry yet */
ret = EIO;
@@ -1248,149 +1215,92 @@ done:
}
static void
-resolve_getsrv_domain_done(struct tevent_req *subreq)
-{
- struct tevent_req *req = tevent_req_callback_data(subreq,
- struct tevent_req);
- struct resolve_srv_state *state = tevent_req_data(req,
- struct resolve_srv_state);
- int ret;
-
- ret = resolve_get_domain_recv(subreq, state->meta->srv_data,
- &state->meta->srv_data->dns_domain);
- talloc_zfree(subreq);
- if (ret) {
- tevent_req_error(req, ret);
- return;
- }
-
- resolve_srv_cont(req);
-}
-
-static void
-resolve_srv_cont(struct tevent_req *req)
-{
- struct resolve_srv_state *state = tevent_req_data(req,
- struct resolve_srv_state);
- char *query;
- struct tevent_req *subreq;
-
- query = get_srv_query(state, state->meta);
- if (!query) {
- tevent_req_error(req, ENOMEM);
- return;
- }
- DEBUG(4, ("Searching for servers via SRV query '%s'\n", query));
-
- subreq = resolv_getsrv_send(state, state->ev, state->resolv, query);
- if (subreq == NULL) {
- tevent_req_error(req, ENOMEM);
- return;
- }
- tevent_req_set_callback(subreq, resolve_srv_done, req);
-}
-
-static void
resolve_srv_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(subreq,
struct tevent_req);
struct resolve_srv_state *state = tevent_req_data(req,
struct resolve_srv_state);
- struct ares_srv_reply *reply_list;
- struct ares_srv_reply *reply;
- struct fo_server *server = NULL;
- struct fo_server *srv_list = NULL;
+ struct fo_server *last_server = NULL;
+ struct fo_server_info *primary_servers = NULL;
+ struct fo_server_info *backup_servers = NULL;
+ size_t num_primary_servers = 0;
+ size_t num_backup_servers = 0;
+ char *dns_domain = NULL;
int ret;
- int resolv_status;
- ret = resolv_getsrv_recv(state, subreq,
- &resolv_status, NULL, &reply_list);
+ ret = state->fo_ctx->srv_recv_fn(state, subreq, &dns_domain,
+ &primary_servers, &num_primary_servers,
+ &backup_servers, &num_backup_servers);
talloc_free(subreq);
- if (ret != EOK) {
- DEBUG(1, ("SRV query failed: [%s]\n",
- resolv_strerror(resolv_status)));
- if (resolv_status == ARES_ENOTFOUND &&
- state->meta->srv_data->dns_domain !=
- state->meta->srv_data->discovery_domain &&
- state->meta->srv_data->dns_domain !=
- state->meta->srv_data->sssd_domain) {
- /* The domain name could not be identified
- * If the domain wasn't specified in the config
- * file, also check whether the SSSD domain
- * works.
- *
- * Programming note: It is safe to compare
- * pointers here, because we're not copying
- * the data, we're just reassigning the pointer
- * for the active domain.
- */
- talloc_free(state->meta->srv_data->dns_domain);
- state->meta->srv_data->dns_domain =
- state->meta->srv_data->sssd_domain;
- resolve_srv_cont(req);
- return;
+ switch (ret) {
+ case EOK:
+ if ((num_primary_servers == 0 || primary_servers == NULL)
+ && (num_backup_servers == 0 || backup_servers == NULL)) {
+ DEBUG(SSSDBG_CRIT_FAILURE, ("SRV lookup plugin returned EOK but "
+ "no servers\n"));
+ ret = EFAULT;
+ goto done;
}
- /* We need to make sure we reset this to NULL
- * so that if we go online later, we re-check
- * the DNS domain
- */
- if (!state->meta->srv_data->discovery_domain) {
- state->meta->srv_data->dns_domain = NULL;
- }
+ talloc_zfree(state->meta->srv_data->dns_domain);
+ state->meta->srv_data->dns_domain = talloc_steal(state->meta->srv_data,
+ dns_domain);
- fo_set_port_status(state->meta, PORT_NOT_WORKING);
- goto fail;
- }
+ last_server = state->meta;
- ret = resolv_sort_srv_reply(state, &reply_list);
- if (ret != EOK) {
- DEBUG(1, ("Could not sort the answers from DNS [%d]: %s\n",
- ret, strerror(ret)));
- fo_set_port_status(state->meta, PORT_NOT_WORKING);
- goto fail;
- }
-
- for (reply = reply_list; reply; reply = reply->next) {
- server = create_fo_server(state->service, reply->host,
- reply->port, state->meta->user_data,
- true);
- if (!server) {
- ret = ENOMEM;
- goto fail;
+ if (primary_servers != NULL) {
+ ret = fo_add_server_list(state->service, last_server,
+ primary_servers, num_primary_servers,
+ state->meta->srv_data,
+ state->meta->user_data,
+ true, &last_server);
+ if (ret != EOK) {
+ goto done;
+ }
}
- server->srv_data = state->meta->srv_data;
- DLIST_ADD_END(srv_list, server, struct fo_server *);
- DEBUG(6, ("Inserted server '%s:%d' for service %s\n",
- server->common->name,
- server->port,
- state->service->name));
- }
+ if (backup_servers != NULL) {
+ ret = fo_add_server_list(state->service, last_server,
+ backup_servers, num_backup_servers,
+ state->meta->srv_data,
+ state->meta->user_data,
+ false, NULL);
+ if (ret != EOK) {
+ goto done;
+ }
+ }
- if (srv_list) {
- DLIST_ADD_LIST_AFTER(state->service->server_list, state->meta,
- srv_list, struct fo_server *);
+ state->out = state->meta->next;
DLIST_REMOVE(state->service->server_list, state->meta);
if (state->service->last_tried_server == state->meta) {
- state->service->last_tried_server = srv_list;
+ state->service->last_tried_server = state->out;
}
- state->out = srv_list;
set_srv_data_status(state->meta->srv_data, SRV_RESOLVED);
- tevent_req_done(req);
+
+ ret = EOK;
+ break;
+ case ERR_SRV_NOT_FOUND:
+ /* fall through */
+ case ERR_SRV_LOOKUP_ERROR:
+ fo_set_port_status(state->meta, PORT_NOT_WORKING);
+ /* fall through */
+ default:
+ DEBUG(SSSDBG_OP_FAILURE, ("Unable to resolve SRV [%d]: %s\n",
+ ret, sss_strerror(ret)));
+ }
+
+done:
+ if (ret != EOK) {
+ state->out = state->meta;
+ set_srv_data_status(state->meta->srv_data, SRV_RESOLVE_ERROR);
+ tevent_req_error(req, ret);
return;
- } else {
- ret = EIO;
- goto fail;
}
-fail:
- state->out = state->meta;
- set_srv_data_status(state->meta->srv_data, SRV_RESOLVE_ERROR);
- tevent_req_error(req, ret);
+ tevent_req_done(req);
}
static int
@@ -1418,101 +1328,6 @@ struct resolve_get_domain_state {
char hostname[HOST_NAME_MAX];
};
-static void resolve_get_domain_done(struct tevent_req *subreq);
-
-struct tevent_req *
-resolve_get_domain_send(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev,
- struct fo_ctx *foctx,
- struct resolv_ctx *resolv)
-{
- int ret;
- struct resolve_get_domain_state *state;
- struct tevent_req *req, *subreq;
-
- req = tevent_req_create(mem_ctx, &state, struct resolve_get_domain_state);
- if (!req) {
- return NULL;
- }
-
- ret = gethostname(state->hostname, HOST_NAME_MAX);
- if (ret) {
- ret = errno;
- DEBUG(2, ("gethostname() failed: [%d]: %s\n",ret, strerror(ret)));
- return NULL;
- }
- state->hostname[HOST_NAME_MAX-1] = '\0';
- DEBUG(7, ("Host name is: %s\n", state->hostname));
-
- subreq = resolv_gethostbyname_send(state, ev, resolv,
- state->hostname,
- foctx->opts->family_order,
- default_host_dbs);
- if (!subreq) {
- talloc_zfree(req);
- return NULL;
- }
- tevent_req_set_callback(subreq, resolve_get_domain_done, req);
-
- return req;
-}
-
-static void resolve_get_domain_done(struct tevent_req *subreq)
-{
- struct tevent_req *req = tevent_req_callback_data(subreq,
- struct tevent_req);
- struct resolve_get_domain_state *state = tevent_req_data(req,
- struct resolve_get_domain_state);
- struct resolv_hostent *rhostent;
- int ret;
- int resolv_status;
-
- ret = resolv_gethostbyname_recv(subreq, req, &resolv_status,
- NULL, &rhostent);
- talloc_zfree(subreq);
- if (ret) {
- DEBUG(SSSDBG_OP_FAILURE,
- ("Could not get fully qualified name for host name %s "
- "error [%d]: %s, resolver returned: [%d]: %s\n",
- state->hostname, ret, strerror(ret), resolv_status,
- resolv_strerror(resolv_status)));
- /* We'll proceed with hostname in this case */
- } else {
- DEBUG(SSSDBG_TRACE_LIBS, ("The full FQDN is: %s\n", rhostent->name));
- state->fqdn = rhostent->name;
- }
- tevent_req_done(req);
-}
-
-int resolve_get_domain_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
- char **dns_domain)
-{
- struct resolve_get_domain_state *state = tevent_req_data(req,
- struct resolve_get_domain_state);
- char *fqdn;
- char *domptr;
-
- TEVENT_REQ_RETURN_ON_ERROR(req);
-
- fqdn = state->fqdn ? state->fqdn : state->hostname;
- domptr = strchr(fqdn, '.');
-
- if (!domptr || (*(domptr+1) == '\0')) {
- /* If the FQDN did not contain a dot or the dot was the last character
- * (broken DNS server perhaps */
- *dns_domain = talloc_strdup(mem_ctx, fqdn);
- } else {
- domptr++;
- *dns_domain = talloc_strdup(mem_ctx, domptr);
- }
-
- if (*dns_domain == NULL) {
- return ENOMEM;
- }
-
- return EOK;
-}
-
static void
set_server_common_status(struct server_common *common,
enum server_status status)