xref: /netbsd-src/external/bsd/openldap/dist/servers/slapd/back-asyncmeta/delete.c (revision 549b59ed3ccf0d36d3097190a0db27b770f3a839)
1 /*	$NetBSD: delete.c,v 1.2 2021/08/14 16:14:59 christos Exp $	*/
2 
3 /* delete.c - delete request handler for back-asyncmeta */
4 /* $OpenLDAP$ */
5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
6  *
7  * Copyright 2016-2021 The OpenLDAP Foundation.
8  * Portions Copyright 2016 Symas Corporation.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted only as authorized by the OpenLDAP
13  * Public License.
14  *
15  * A copy of this license is available in the file LICENSE in the
16  * top-level directory of the distribution or, alternatively, at
17  * <http://www.OpenLDAP.org/license.html>.
18  */
19 
20 /* ACKNOWLEDGEMENTS:
21 + * This work was developed by Symas Corporation
22 + * based on back-meta module for inclusion in OpenLDAP Software.
23 + * This work was sponsored by Ericsson. */
24 
25 #include <sys/cdefs.h>
26 __RCSID("$NetBSD: delete.c,v 1.2 2021/08/14 16:14:59 christos Exp $");
27 
28 #include "portable.h"
29 
30 #include <stdio.h>
31 #include <ac/string.h>
32 #include <ac/socket.h>
33 #include "slap.h"
34 #include "../../../libraries/liblber/lber-int.h"
35 #include "../../../libraries/libldap/ldap-int.h"
36 #include "../back-ldap/back-ldap.h"
37 #include "back-asyncmeta.h"
38 
39 meta_search_candidate_t
asyncmeta_back_delete_start(Operation * op,SlapReply * rs,a_metaconn_t * mc,bm_context_t * bc,int candidate,int do_lock)40 asyncmeta_back_delete_start(Operation *op,
41 			    SlapReply *rs,
42 			    a_metaconn_t *mc,
43 			    bm_context_t *bc,
44 			    int candidate,
45 			    int do_lock)
46 {
47 	a_metainfo_t	*mi = mc->mc_info;
48 	a_metatarget_t	*mt = mi->mi_targets[ candidate ];
49 	struct berval	mdn = BER_BVNULL;
50 	a_dncookie	dc;
51 	int rc = 0;
52 	LDAPControl	**ctrls = NULL;
53 	meta_search_candidate_t retcode = META_SEARCH_CANDIDATE;
54 	BerElement *ber = NULL;
55 	a_metasingleconn_t	*msc = &mc->mc_conns[ candidate ];
56 	SlapReply		*candidates = bc->candidates;
57 	ber_int_t	msgid;
58 
59 	dc.op = op;
60 	dc.target = mt;
61 	dc.memctx = op->o_tmpmemctx;
62 	dc.to_from = MASSAGE_REQ;
63 
64 	asyncmeta_dn_massage( &dc, &op->o_req_dn, &mdn );
65 
66 	asyncmeta_set_msc_time(msc);
67 	ctrls = op->o_ctrls;
68 	if ( asyncmeta_controls_add( op, rs, mc, candidate, bc->is_root, &ctrls ) != LDAP_SUCCESS )
69 	{
70 		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
71 		retcode = META_SEARCH_ERR;
72 		goto done;
73 	}
74 	/* someone might have reset the connection */
75 	if (!( LDAP_BACK_CONN_ISBOUND( msc )
76 	       || LDAP_BACK_CONN_ISANON( msc )) || msc->msc_ld == NULL ) {
77 		Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
78 		goto error_unavailable;
79 	}
80 	ber = ldap_build_delete_req( msc->msc_ld, mdn.bv_val, ctrls, NULL, &msgid);
81 
82 	if (!ber) {
83 		Debug( asyncmeta_debug, "%s asyncmeta_back_delete_start: Operation encoding failed with errno %d\n",
84 		       op->o_log_prefix, msc->msc_ld->ld_errno );
85 		rs->sr_err = LDAP_OPERATIONS_ERROR;
86 		rs->sr_text = "Failed to encode proxied request";
87 		retcode = META_SEARCH_ERR;
88 		goto done;
89 	}
90 
91 	if (ber) {
92 		struct timeval tv = {0, mt->mt_network_timeout*1000};
93 		ber_socket_t s;
94 		if (!( LDAP_BACK_CONN_ISBOUND( msc )
95 		       || LDAP_BACK_CONN_ISANON( msc )) || msc->msc_ld == NULL ) {
96 			Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
97 			goto error_unavailable;
98 		}
99 
100 		ldap_get_option( msc->msc_ld, LDAP_OPT_DESC, &s );
101 		if (s < 0) {
102 			Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
103 			goto error_unavailable;
104 		}
105 
106 		rc = ldap_int_poll( msc->msc_ld, s, &tv, 1);
107 		if (rc < 0) {
108 			Debug( asyncmeta_debug, "msc %p not writable within network timeout %s:%d\n", msc, __FILE__, __LINE__ );
109 			if ((msc->msc_result_time + META_BACK_RESULT_INTERVAL) < slap_get_time()) {
110 				rc = LDAP_SERVER_DOWN;
111 			} else {
112 				goto error_unavailable;
113 			}
114 		} else {
115 			candidates[ candidate ].sr_msgid = msgid;
116 			rc = ldap_send_initial_request( msc->msc_ld, LDAP_REQ_DELETE,
117 							mdn.bv_val, ber, msgid );
118 			if (rc == msgid)
119 				rc = LDAP_SUCCESS;
120 			else
121 				rc = LDAP_SERVER_DOWN;
122 			ber = NULL;
123 		}
124 
125 		switch ( rc ) {
126 		case LDAP_SUCCESS:
127 			retcode = META_SEARCH_CANDIDATE;
128 			asyncmeta_set_msc_time(msc);
129 			goto done;
130 
131 		case LDAP_SERVER_DOWN:
132 			/* do not lock if called from asyncmeta_handle_bind_result. Also do not reset the connection */
133 			if (do_lock > 0) {
134 				ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
135 				asyncmeta_reset_msc(NULL, mc, candidate, 0, __FUNCTION__);
136 				ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
137 			}
138 			/* fall though*/
139 		default:
140 			Debug( asyncmeta_debug, "msc %p ldap_send_initial_request failed. %s:%d\n", msc, __FILE__, __LINE__ );
141 			goto error_unavailable;
142 		}
143 	}
144 
145 error_unavailable:
146 	if (ber)
147 		ber_free(ber, 1);
148 	switch (bc->nretries[candidate]) {
149 	case -1: /* nretries = forever */
150 		retcode = META_SEARCH_NEED_BIND;
151 		ldap_pvt_thread_yield();
152 		break;
153 	case 0: /* no retries left */
154 		candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
155 		rs->sr_err = LDAP_UNAVAILABLE;
156 		rs->sr_text = "Unable to send delete request to target";
157 		retcode = META_SEARCH_ERR;
158 		break;
159 	default: /* more retries left - try to rebind and go again */
160 		retcode = META_SEARCH_NEED_BIND;
161 		bc->nretries[candidate]--;
162 		ldap_pvt_thread_yield();
163 		break;
164 	}
165 done:
166 	(void)mi->mi_ldap_extra->controls_free( op, rs, &ctrls );
167 
168 	if ( mdn.bv_val != op->o_req_dn.bv_val ) {
169 		op->o_tmpfree( mdn.bv_val, op->o_tmpmemctx );
170 	}
171 
172 	Debug( LDAP_DEBUG_TRACE, "%s <<< asyncmeta_back_delete_start[%p]=%d\n", op->o_log_prefix, msc, candidates[candidate].sr_msgid );
173 	return retcode;
174 }
175 
176 int
asyncmeta_back_delete(Operation * op,SlapReply * rs)177 asyncmeta_back_delete( Operation *op, SlapReply *rs )
178 {
179 	a_metainfo_t	*mi = ( a_metainfo_t * )op->o_bd->be_private;
180 	a_metatarget_t	*mt;
181 	a_metaconn_t	*mc;
182 	int		rc, candidate = -1;
183 	void *thrctx = op->o_threadctx;
184 	bm_context_t *bc;
185 	SlapReply *candidates;
186 	time_t current_time = slap_get_time();
187 
188 	int max_pending_ops = (mi->mi_max_pending_ops == 0) ? META_BACK_CFG_MAX_PENDING_OPS : mi->mi_max_pending_ops;
189 
190 	Debug(LDAP_DEBUG_TRACE, "==> asyncmeta_back_delete: %s\n",
191 	      op->o_req_dn.bv_val );
192 
193 	if (current_time > op->o_time) {
194 		Debug(asyncmeta_debug, "==> asyncmeta_back_delete[%s]: o_time:[%ld], current time: [%ld]\n",
195 		      op->o_log_prefix, op->o_time, current_time );
196 	}
197 
198 	asyncmeta_new_bm_context(op, rs, &bc, mi->mi_ntargets, mi );
199 	if (bc == NULL) {
200 		rs->sr_err = LDAP_OTHER;
201 		send_ldap_result(op, rs);
202 		return rs->sr_err;
203 	}
204 
205 	candidates = bc->candidates;
206 	mc = asyncmeta_getconn( op, rs, candidates, &candidate, LDAP_BACK_DONTSEND, 0);
207 	if ( !mc || rs->sr_err != LDAP_SUCCESS) {
208 		send_ldap_result(op, rs);
209 		return rs->sr_err;
210 	}
211 
212 	mt = mi->mi_targets[ candidate ];
213 	bc->timeout = mt->mt_timeout[ SLAP_OP_DELETE ];
214 	bc->retrying = LDAP_BACK_RETRYING;
215 	bc->sendok = ( LDAP_BACK_SENDRESULT | bc->retrying );
216 	bc->stoptime = op->o_time + bc->timeout;
217 	bc->bc_active = 1;
218 
219 	if (mc->pending_ops >= max_pending_ops) {
220 		rs->sr_err = LDAP_BUSY;
221 		rs->sr_text = "Maximum pending ops limit exceeded";
222 		send_ldap_result(op, rs);
223 		return rs->sr_err;
224 	}
225 
226 	ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
227 	rc = asyncmeta_add_message_queue(mc, bc);
228 	mc->mc_conns[candidate].msc_active++;
229 	ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
230 
231 	if (rc != LDAP_SUCCESS) {
232 		rs->sr_err = LDAP_BUSY;
233 		rs->sr_text = "Maximum pending ops limit exceeded";
234 		send_ldap_result(op, rs);
235 		ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
236 		mc->mc_conns[candidate].msc_active--;
237 		ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
238 		goto finish;
239 	}
240 
241 retry:
242 	if (bc->timeout && bc->stoptime < slap_get_time()) {
243 		int		timeout_err;
244 		timeout_err = op->o_protocol >= LDAP_VERSION3 ?
245 			LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
246 		rs->sr_err = timeout_err;
247 		rs->sr_text = "Operation timed out before it was sent to target";
248 		asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
249 		goto finish;
250 	}
251 
252 	rc = asyncmeta_dobind_init_with_retry(op, rs, bc, mc, candidate);
253 	switch (rc)
254 	{
255 	case META_SEARCH_CANDIDATE:
256 		/* target is already bound, just send the request */
257 		Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_delete:  "
258 		       "cnd=\"%d\"\n", op->o_log_prefix, candidate );
259 
260 		rc = asyncmeta_back_delete_start( op, rs, mc, bc, candidate, 1);
261 		if (rc == META_SEARCH_ERR) {
262 			asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
263 			goto finish;
264 
265 		} else if (rc == META_SEARCH_NEED_BIND) {
266 			goto retry;
267 		}
268 		break;
269 	case META_SEARCH_NOT_CANDIDATE:
270 		Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_delete: NOT_CANDIDATE "
271 		       "cnd=\"%d\"\n", op->o_log_prefix, candidate );
272 		asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
273 		goto finish;
274 
275 	case META_SEARCH_NEED_BIND:
276 	case META_SEARCH_BINDING:
277 			Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_delete: BINDING "
278 			       "cnd=\"%d\" %p\n", op->o_log_prefix, candidate , &mc->mc_conns[candidate]);
279 			/* Todo add the context to the message queue but do not send the request
280 			   the receiver must send this when we are done binding */
281 			/* question - how would do receiver know to which targets??? */
282 			break;
283 
284 	case META_SEARCH_ERR:
285 			Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_delete: ERR "
286 			       "cnd=\"%d\"\n", op->o_log_prefix, candidate );
287 			asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
288 			goto finish;
289 		default:
290 			assert( 0 );
291 			break;
292 		}
293 
294 	ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
295 	mc->mc_conns[candidate].msc_active--;
296 	asyncmeta_start_one_listener(mc, candidates, bc, candidate);
297 	bc->bc_active--;
298 	ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
299 	rs->sr_err = SLAPD_ASYNCOP;
300 finish:
301 	return rs->sr_err;
302 }
303