diff options
Diffstat (limited to 'src/providers/ipa/ipa_srv.c')
| -rw-r--r-- | src/providers/ipa/ipa_srv.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/src/providers/ipa/ipa_srv.c b/src/providers/ipa/ipa_srv.c new file mode 100644 index 0000000..7477711 --- /dev/null +++ b/src/providers/ipa/ipa_srv.c @@ -0,0 +1,224 @@ +/* + Authors: + Pavel Březina <pbrezina@redhat.com> + + Copyright (C) 2013 Red Hat + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <string.h> +#include <talloc.h> +#include <tevent.h> + +#include "util/util.h" +#include "resolv/async_resolv.h" +#include "providers/fail_over_srv.h" +#include "providers/ipa/ipa_srv.h" + +#define IPA_DNS_LOCATION "_location" + +struct ipa_srv_plugin_ctx { + struct resolv_ctx *resolv_ctx; + const char *hostname; + const char *ipa_domain; +}; + +struct ipa_srv_plugin_ctx * +ipa_srv_plugin_ctx_init(TALLOC_CTX *mem_ctx, + struct resolv_ctx *resolv_ctx, + const char *hostname, + const char *ipa_domain) +{ + struct ipa_srv_plugin_ctx *ctx = NULL; + + ctx = talloc_zero(mem_ctx, struct ipa_srv_plugin_ctx); + if (ctx == NULL) { + return NULL; + } + + ctx->resolv_ctx = resolv_ctx; + + ctx->hostname = talloc_strdup(ctx, hostname); + if (ctx->hostname == NULL) { + goto fail; + } + + ctx->ipa_domain = talloc_strdup(ctx, ipa_domain); + if (ctx->ipa_domain == NULL) { + goto fail; + } + + return ctx; + +fail: + talloc_free(ctx); + return NULL; +} + +struct ipa_srv_plugin_state { + char *dns_domain; + uint32_t ttl; + struct fo_server_info *primary_servers; + size_t num_primary_servers; + struct fo_server_info *backup_servers; + size_t num_backup_servers; +}; + +static void ipa_srv_plugin_done(struct tevent_req *subreq); + +/* If IPA server supports sites, we will use + * _locations.hostname.discovery_domain for primary servers and + * discovery_domain for backup servers. If the server does not support sites or + * client's SRV record is not found, we will use the latter for primary + * servers, setting backup servers to NULL */ +struct tevent_req *ipa_srv_plugin_send(TALLOC_CTX *mem_ctx, + struct tevent_context *ev, + const char *service, + const char *protocol, + const char *discovery_domain, + void *pvt) +{ + struct ipa_srv_plugin_state *state = NULL; + struct ipa_srv_plugin_ctx *ctx = NULL; + struct tevent_req *req = NULL; + struct tevent_req *subreq = NULL; + const char *primary_domain = NULL; + const char *backup_domain = NULL; + errno_t ret; + + req = tevent_req_create(mem_ctx, &state, + struct ipa_srv_plugin_state); + if (req == NULL) { + DEBUG(SSSDBG_CRIT_FAILURE, "tevent_req_create() failed\n"); + return NULL; + } + + ctx = talloc_get_type(pvt, struct ipa_srv_plugin_ctx); + if (ctx == NULL) { + ret = EINVAL; + goto immediately; + } + + if (discovery_domain != NULL) { + backup_domain = talloc_strdup(state, discovery_domain); + } else { + backup_domain = talloc_strdup(state, ctx->ipa_domain); + } + if (backup_domain == NULL) { + ret = ENOMEM; + goto immediately; + } + + if (strchr(ctx->hostname, '.') == NULL) { + /* not FQDN, append domain name */ + primary_domain = talloc_asprintf(state, IPA_DNS_LOCATION ".%s.%s", + ctx->hostname, backup_domain); + } else { + primary_domain = talloc_asprintf(state, IPA_DNS_LOCATION ".%s", + ctx->hostname); + } + if (primary_domain == NULL) { + ret = ENOMEM; + goto immediately; + } + + DEBUG(SSSDBG_TRACE_FUNC, "About to discover primary and " + "backup servers\n"); + + subreq = fo_discover_servers_send(state, ev, ctx->resolv_ctx, service, + protocol, primary_domain, backup_domain); + if (subreq == NULL) { + ret = ENOMEM; + goto immediately; + } + + tevent_req_set_callback(subreq, ipa_srv_plugin_done, req); + + return req; + +immediately: + tevent_req_error(req, ret); + tevent_req_post(req, ev); + + return req; +} + +static void ipa_srv_plugin_done(struct tevent_req *subreq) +{ + struct ipa_srv_plugin_state *state = NULL; + struct tevent_req *req = NULL; + errno_t ret; + + req = tevent_req_callback_data(subreq, struct tevent_req); + state = tevent_req_data(req, struct ipa_srv_plugin_state); + + ret = fo_discover_servers_recv(state, subreq, &state->dns_domain, + &state->ttl, + &state->primary_servers, + &state->num_primary_servers, + &state->backup_servers, + &state->num_backup_servers); + talloc_zfree(subreq); + if (ret != EOK) { + tevent_req_error(req, ret); + return; + } + + DEBUG(SSSDBG_TRACE_FUNC, "Got %zu primary and %zu backup servers\n", + state->num_primary_servers, state->num_backup_servers); + + tevent_req_done(req); +} + +errno_t ipa_srv_plugin_recv(TALLOC_CTX *mem_ctx, + struct tevent_req *req, + char **_dns_domain, + uint32_t *_ttl, + struct fo_server_info **_primary_servers, + size_t *_num_primary_servers, + struct fo_server_info **_backup_servers, + size_t *_num_backup_servers) +{ + struct ipa_srv_plugin_state *state = NULL; + state = tevent_req_data(req, struct ipa_srv_plugin_state); + + TEVENT_REQ_RETURN_ON_ERROR(req); + + if (_primary_servers) { + *_primary_servers = talloc_steal(mem_ctx, state->primary_servers); + } + + if (_num_primary_servers) { + *_num_primary_servers = state->num_primary_servers; + } + + if (_backup_servers) { + *_backup_servers = talloc_steal(mem_ctx, state->backup_servers); + } + + if (_num_backup_servers) { + *_num_backup_servers = state->num_backup_servers; + } + + if (_dns_domain) { + *_dns_domain = talloc_steal(mem_ctx, state->dns_domain); + } + + if (_ttl) { + *_ttl = state->ttl; + } + + return EOK; +} |