1/*
2 * RADIUS client
3 * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#include "includes.h"
16
17#include "common.h"
18#include "radius.h"
19#include "radius_client.h"
20#include "eloop.h"
21
22/* Defaults for RADIUS retransmit values (exponential backoff) */
23
24/**
25 * RADIUS_CLIENT_FIRST_WAIT - RADIUS client timeout for first retry in seconds
26 */
27#define RADIUS_CLIENT_FIRST_WAIT 3
28
29/**
30 * RADIUS_CLIENT_MAX_WAIT - RADIUS client maximum retry timeout in seconds
31 */
32#define RADIUS_CLIENT_MAX_WAIT 120
33
34/**
35 * RADIUS_CLIENT_MAX_RETRIES - RADIUS client maximum retries
36 *
37 * Maximum number of retransmit attempts before the entry is removed from
38 * retransmit list.
39 */
40#define RADIUS_CLIENT_MAX_RETRIES 10
41
42/**
43 * RADIUS_CLIENT_MAX_ENTRIES - RADIUS client maximum pending messages
44 *
45 * Maximum number of entries in retransmit list (oldest entries will be
46 * removed, if this limit is exceeded).
47 */
48#define RADIUS_CLIENT_MAX_ENTRIES 30
49
50/**
51 * RADIUS_CLIENT_NUM_FAILOVER - RADIUS client failover point
52 *
53 * The number of failed retry attempts after which the RADIUS server will be
54 * changed (if one of more backup servers are configured).
55 */
56#define RADIUS_CLIENT_NUM_FAILOVER 4
57
58
59/**
60 * struct radius_rx_handler - RADIUS client RX handler
61 *
62 * This data structure is used internally inside the RADIUS client module to
63 * store registered RX handlers. These handlers are registered by calls to
64 * radius_client_register() and unregistered when the RADIUS client is
65 * deinitialized with a call to radius_client_deinit().
66 */
67struct radius_rx_handler {
68	/**
69	 * handler - Received RADIUS message handler
70	 */
71	RadiusRxResult (*handler)(struct radius_msg *msg,
72				  struct radius_msg *req,
73				  const u8 *shared_secret,
74				  size_t shared_secret_len,
75				  void *data);
76
77	/**
78	 * data - Context data for the handler
79	 */
80	void *data;
81};
82
83
84/**
85 * struct radius_msg_list - RADIUS client message retransmit list
86 *
87 * This data structure is used internally inside the RADIUS client module to
88 * store pending RADIUS requests that may still need to be retransmitted.
89 */
90struct radius_msg_list {
91	/**
92	 * addr - STA/client address
93	 *
94	 * This is used to find RADIUS messages for the same STA.
95	 */
96	u8 addr[ETH_ALEN];
97
98	/**
99	 * msg - RADIUS message
100	 */
101	struct radius_msg *msg;
102
103	/**
104	 * msg_type - Message type
105	 */
106	RadiusType msg_type;
107
108	/**
109	 * first_try - Time of the first transmission attempt
110	 */
111	os_time_t first_try;
112
113	/**
114	 * next_try - Time for the next transmission attempt
115	 */
116	os_time_t next_try;
117
118	/**
119	 * attempts - Number of transmission attempts
120	 */
121	int attempts;
122
123	/**
124	 * next_wait - Next retransmission wait time in seconds
125	 */
126	int next_wait;
127
128	/**
129	 * last_attempt - Time of the last transmission attempt
130	 */
131	struct os_time last_attempt;
132
133	/**
134	 * shared_secret - Shared secret with the target RADIUS server
135	 */
136	const u8 *shared_secret;
137
138	/**
139	 * shared_secret_len - shared_secret length in octets
140	 */
141	size_t shared_secret_len;
142
143	/* TODO: server config with failover to backup server(s) */
144
145	/**
146	 * next - Next message in the list
147	 */
148	struct radius_msg_list *next;
149};
150
151
152/**
153 * struct radius_client_data - Internal RADIUS client data
154 *
155 * This data structure is used internally inside the RADIUS client module.
156 * External users allocate this by calling radius_client_init() and free it by
157 * calling radius_client_deinit(). The pointer to this opaque data is used in
158 * calls to other functions as an identifier for the RADIUS client instance.
159 */
160struct radius_client_data {
161	/**
162	 * ctx - Context pointer for hostapd_logger() callbacks
163	 */
164	void *ctx;
165
166	/**
167	 * conf - RADIUS client configuration (list of RADIUS servers to use)
168	 */
169	struct hostapd_radius_servers *conf;
170
171	/**
172	 * auth_serv_sock - IPv4 socket for RADIUS authentication messages
173	 */
174	int auth_serv_sock;
175
176	/**
177	 * acct_serv_sock - IPv4 socket for RADIUS accounting messages
178	 */
179	int acct_serv_sock;
180
181	/**
182	 * auth_serv_sock6 - IPv6 socket for RADIUS authentication messages
183	 */
184	int auth_serv_sock6;
185
186	/**
187	 * acct_serv_sock6 - IPv6 socket for RADIUS accounting messages
188	 */
189	int acct_serv_sock6;
190
191	/**
192	 * auth_sock - Currently used socket for RADIUS authentication server
193	 */
194	int auth_sock;
195
196	/**
197	 * acct_sock - Currently used socket for RADIUS accounting server
198	 */
199	int acct_sock;
200
201	/**
202	 * auth_handlers - Authentication message handlers
203	 */
204	struct radius_rx_handler *auth_handlers;
205
206	/**
207	 * num_auth_handlers - Number of handlers in auth_handlers
208	 */
209	size_t num_auth_handlers;
210
211	/**
212	 * acct_handlers - Accounting message handlers
213	 */
214	struct radius_rx_handler *acct_handlers;
215
216	/**
217	 * num_acct_handlers - Number of handlers in acct_handlers
218	 */
219	size_t num_acct_handlers;
220
221	/**
222	 * msgs - Pending outgoing RADIUS messages
223	 */
224	struct radius_msg_list *msgs;
225
226	/**
227	 * num_msgs - Number of pending messages in the msgs list
228	 */
229	size_t num_msgs;
230
231	/**
232	 * next_radius_identifier - Next RADIUS message identifier to use
233	 */
234	u8 next_radius_identifier;
235};
236
237
238static int
239radius_change_server(struct radius_client_data *radius,
240		     struct hostapd_radius_server *nserv,
241		     struct hostapd_radius_server *oserv,
242		     int sock, int sock6, int auth);
243static int radius_client_init_acct(struct radius_client_data *radius);
244static int radius_client_init_auth(struct radius_client_data *radius);
245
246
247static void radius_client_msg_free(struct radius_msg_list *req)
248{
249	radius_msg_free(req->msg);
250	os_free(req);
251}
252
253
254/**
255 * radius_client_register - Register a RADIUS client RX handler
256 * @radius: RADIUS client context from radius_client_init()
257 * @msg_type: RADIUS client type (RADIUS_AUTH or RADIUS_ACCT)
258 * @handler: Handler for received RADIUS messages
259 * @data: Context pointer for handler callbacks
260 * Returns: 0 on success, -1 on failure
261 *
262 * This function is used to register a handler for processing received RADIUS
263 * authentication and accounting messages. The handler() callback function will
264 * be called whenever a RADIUS message is received from the active server.
265 *
266 * There can be multiple registered RADIUS message handlers. The handlers will
267 * be called in order until one of them indicates that it has processed or
268 * queued the message.
269 */
270int radius_client_register(struct radius_client_data *radius,
271			   RadiusType msg_type,
272			   RadiusRxResult (*handler)(struct radius_msg *msg,
273						     struct radius_msg *req,
274						     const u8 *shared_secret,
275						     size_t shared_secret_len,
276						     void *data),
277			   void *data)
278{
279	struct radius_rx_handler **handlers, *newh;
280	size_t *num;
281
282	if (msg_type == RADIUS_ACCT) {
283		handlers = &radius->acct_handlers;
284		num = &radius->num_acct_handlers;
285	} else {
286		handlers = &radius->auth_handlers;
287		num = &radius->num_auth_handlers;
288	}
289
290	newh = os_realloc(*handlers,
291			  (*num + 1) * sizeof(struct radius_rx_handler));
292	if (newh == NULL)
293		return -1;
294
295	newh[*num].handler = handler;
296	newh[*num].data = data;
297	(*num)++;
298	*handlers = newh;
299
300	return 0;
301}
302
303
304static void radius_client_handle_send_error(struct radius_client_data *radius,
305					    int s, RadiusType msg_type)
306{
307#ifndef CONFIG_NATIVE_WINDOWS
308	int _errno = errno;
309	perror("send[RADIUS]");
310	if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL ||
311	    _errno == EBADF) {
312		hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
313			       HOSTAPD_LEVEL_INFO,
314			       "Send failed - maybe interface status changed -"
315			       " try to connect again");
316		eloop_unregister_read_sock(s);
317		close(s);
318		if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM)
319			radius_client_init_acct(radius);
320		else
321			radius_client_init_auth(radius);
322	}
323#endif /* CONFIG_NATIVE_WINDOWS */
324}
325
326
327static int radius_client_retransmit(struct radius_client_data *radius,
328				    struct radius_msg_list *entry,
329				    os_time_t now)
330{
331	struct hostapd_radius_servers *conf = radius->conf;
332	int s;
333	struct wpabuf *buf;
334
335	if (entry->msg_type == RADIUS_ACCT ||
336	    entry->msg_type == RADIUS_ACCT_INTERIM) {
337		s = radius->acct_sock;
338		if (entry->attempts == 0)
339			conf->acct_server->requests++;
340		else {
341			conf->acct_server->timeouts++;
342			conf->acct_server->retransmissions++;
343		}
344	} else {
345		s = radius->auth_sock;
346		if (entry->attempts == 0)
347			conf->auth_server->requests++;
348		else {
349			conf->auth_server->timeouts++;
350			conf->auth_server->retransmissions++;
351		}
352	}
353
354	/* retransmit; remove entry if too many attempts */
355	entry->attempts++;
356	hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS,
357		       HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)",
358		       radius_msg_get_hdr(entry->msg)->identifier);
359
360	os_get_time(&entry->last_attempt);
361	buf = radius_msg_get_buf(entry->msg);
362	if (send(s, wpabuf_head(buf), wpabuf_len(buf), 0) < 0)
363		radius_client_handle_send_error(radius, s, entry->msg_type);
364
365	entry->next_try = now + entry->next_wait;
366	entry->next_wait *= 2;
367	if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT)
368		entry->next_wait = RADIUS_CLIENT_MAX_WAIT;
369	if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) {
370		printf("Removing un-ACKed RADIUS message due to too many "
371		       "failed retransmit attempts\n");
372		return 1;
373	}
374
375	return 0;
376}
377
378
379static void radius_client_timer(void *eloop_ctx, void *timeout_ctx)
380{
381	struct radius_client_data *radius = eloop_ctx;
382	struct hostapd_radius_servers *conf = radius->conf;
383	struct os_time now;
384	os_time_t first;
385	struct radius_msg_list *entry, *prev, *tmp;
386	int auth_failover = 0, acct_failover = 0;
387	char abuf[50];
388
389	entry = radius->msgs;
390	if (!entry)
391		return;
392
393	os_get_time(&now);
394	first = 0;
395
396	prev = NULL;
397	while (entry) {
398		if (now.sec >= entry->next_try &&
399		    radius_client_retransmit(radius, entry, now.sec)) {
400			if (prev)
401				prev->next = entry->next;
402			else
403				radius->msgs = entry->next;
404
405			tmp = entry;
406			entry = entry->next;
407			radius_client_msg_free(tmp);
408			radius->num_msgs--;
409			continue;
410		}
411
412		if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) {
413			if (entry->msg_type == RADIUS_ACCT ||
414			    entry->msg_type == RADIUS_ACCT_INTERIM)
415				acct_failover++;
416			else
417				auth_failover++;
418		}
419
420		if (first == 0 || entry->next_try < first)
421			first = entry->next_try;
422
423		prev = entry;
424		entry = entry->next;
425	}
426
427	if (radius->msgs) {
428		if (first < now.sec)
429			first = now.sec;
430		eloop_register_timeout(first - now.sec, 0,
431				       radius_client_timer, radius, NULL);
432		hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
433			       HOSTAPD_LEVEL_DEBUG, "Next RADIUS client "
434			       "retransmit in %ld seconds",
435			       (long int) (first - now.sec));
436	}
437
438	if (auth_failover && conf->num_auth_servers > 1) {
439		struct hostapd_radius_server *next, *old;
440		old = conf->auth_server;
441		hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
442			       HOSTAPD_LEVEL_NOTICE,
443			       "No response from Authentication server "
444			       "%s:%d - failover",
445			       hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
446			       old->port);
447
448		for (entry = radius->msgs; entry; entry = entry->next) {
449			if (entry->msg_type == RADIUS_AUTH)
450				old->timeouts++;
451		}
452
453		next = old + 1;
454		if (next > &(conf->auth_servers[conf->num_auth_servers - 1]))
455			next = conf->auth_servers;
456		conf->auth_server = next;
457		radius_change_server(radius, next, old,
458				     radius->auth_serv_sock,
459				     radius->auth_serv_sock6, 1);
460	}
461
462	if (acct_failover && conf->num_acct_servers > 1) {
463		struct hostapd_radius_server *next, *old;
464		old = conf->acct_server;
465		hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
466			       HOSTAPD_LEVEL_NOTICE,
467			       "No response from Accounting server "
468			       "%s:%d - failover",
469			       hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)),
470			       old->port);
471
472		for (entry = radius->msgs; entry; entry = entry->next) {
473			if (entry->msg_type == RADIUS_ACCT ||
474			    entry->msg_type == RADIUS_ACCT_INTERIM)
475				old->timeouts++;
476		}
477
478		next = old + 1;
479		if (next > &conf->acct_servers[conf->num_acct_servers - 1])
480			next = conf->acct_servers;
481		conf->acct_server = next;
482		radius_change_server(radius, next, old,
483				     radius->acct_serv_sock,
484				     radius->acct_serv_sock6, 0);
485	}
486}
487
488
489static void radius_client_update_timeout(struct radius_client_data *radius)
490{
491	struct os_time now;
492	os_time_t first;
493	struct radius_msg_list *entry;
494
495	eloop_cancel_timeout(radius_client_timer, radius, NULL);
496
497	if (radius->msgs == NULL) {
498		return;
499	}
500
501	first = 0;
502	for (entry = radius->msgs; entry; entry = entry->next) {
503		if (first == 0 || entry->next_try < first)
504			first = entry->next_try;
505	}
506
507	os_get_time(&now);
508	if (first < now.sec)
509		first = now.sec;
510	eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius,
511			       NULL);
512	hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
513		       HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in"
514		       " %ld seconds\n", (long int) (first - now.sec));
515}
516
517
518static void radius_client_list_add(struct radius_client_data *radius,
519				   struct radius_msg *msg,
520				   RadiusType msg_type,
521				   const u8 *shared_secret,
522				   size_t shared_secret_len, const u8 *addr)
523{
524	struct radius_msg_list *entry, *prev;
525
526	if (eloop_terminated()) {
527		/* No point in adding entries to retransmit queue since event
528		 * loop has already been terminated. */
529		radius_msg_free(msg);
530		return;
531	}
532
533	entry = os_zalloc(sizeof(*entry));
534	if (entry == NULL) {
535		printf("Failed to add RADIUS packet into retransmit list\n");
536		radius_msg_free(msg);
537		return;
538	}
539
540	if (addr)
541		os_memcpy(entry->addr, addr, ETH_ALEN);
542	entry->msg = msg;
543	entry->msg_type = msg_type;
544	entry->shared_secret = shared_secret;
545	entry->shared_secret_len = shared_secret_len;
546	os_get_time(&entry->last_attempt);
547	entry->first_try = entry->last_attempt.sec;
548	entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
549	entry->attempts = 1;
550	entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
551	entry->next = radius->msgs;
552	radius->msgs = entry;
553	radius_client_update_timeout(radius);
554
555	if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) {
556		printf("Removing the oldest un-ACKed RADIUS packet due to "
557		       "retransmit list limits.\n");
558		prev = NULL;
559		while (entry->next) {
560			prev = entry;
561			entry = entry->next;
562		}
563		if (prev) {
564			prev->next = NULL;
565			radius_client_msg_free(entry);
566		}
567	} else
568		radius->num_msgs++;
569}
570
571
572static void radius_client_list_del(struct radius_client_data *radius,
573				   RadiusType msg_type, const u8 *addr)
574{
575	struct radius_msg_list *entry, *prev, *tmp;
576
577	if (addr == NULL)
578		return;
579
580	entry = radius->msgs;
581	prev = NULL;
582	while (entry) {
583		if (entry->msg_type == msg_type &&
584		    os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
585			if (prev)
586				prev->next = entry->next;
587			else
588				radius->msgs = entry->next;
589			tmp = entry;
590			entry = entry->next;
591			hostapd_logger(radius->ctx, addr,
592				       HOSTAPD_MODULE_RADIUS,
593				       HOSTAPD_LEVEL_DEBUG,
594				       "Removing matching RADIUS message");
595			radius_client_msg_free(tmp);
596			radius->num_msgs--;
597			continue;
598		}
599		prev = entry;
600		entry = entry->next;
601	}
602}
603
604
605/**
606 * radius_client_send - Send a RADIUS request
607 * @radius: RADIUS client context from radius_client_init()
608 * @msg: RADIUS message to be sent
609 * @msg_type: Message type (RADIUS_AUTH, RADIUS_ACCT, RADIUS_ACCT_INTERIM)
610 * @addr: MAC address of the device related to this message or %NULL
611 * Returns: 0 on success, -1 on failure
612 *
613 * This function is used to transmit a RADIUS authentication (RADIUS_AUTH) or
614 * accounting request (RADIUS_ACCT or RADIUS_ACCT_INTERIM). The only difference
615 * between accounting and interim accounting messages is that the interim
616 * message will override any pending interim accounting updates while a new
617 * accounting message does not remove any pending messages.
618 *
619 * The message is added on the retransmission queue and will be retransmitted
620 * automatically until a response is received or maximum number of retries
621 * (RADIUS_CLIENT_MAX_RETRIES) is reached.
622 *
623 * The related device MAC address can be used to identify pending messages that
624 * can be removed with radius_client_flush_auth() or with interim accounting
625 * updates.
626 */
627int radius_client_send(struct radius_client_data *radius,
628		       struct radius_msg *msg, RadiusType msg_type,
629		       const u8 *addr)
630{
631	struct hostapd_radius_servers *conf = radius->conf;
632	const u8 *shared_secret;
633	size_t shared_secret_len;
634	char *name;
635	int s, res;
636	struct wpabuf *buf;
637
638	if (msg_type == RADIUS_ACCT_INTERIM) {
639		/* Remove any pending interim acct update for the same STA. */
640		radius_client_list_del(radius, msg_type, addr);
641	}
642
643	if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) {
644		if (conf->acct_server == NULL) {
645			hostapd_logger(radius->ctx, NULL,
646				       HOSTAPD_MODULE_RADIUS,
647				       HOSTAPD_LEVEL_INFO,
648				       "No accounting server configured");
649			return -1;
650		}
651		shared_secret = conf->acct_server->shared_secret;
652		shared_secret_len = conf->acct_server->shared_secret_len;
653		radius_msg_finish_acct(msg, shared_secret, shared_secret_len);
654		name = "accounting";
655		s = radius->acct_sock;
656		conf->acct_server->requests++;
657	} else {
658		if (conf->auth_server == NULL) {
659			hostapd_logger(radius->ctx, NULL,
660				       HOSTAPD_MODULE_RADIUS,
661				       HOSTAPD_LEVEL_INFO,
662				       "No authentication server configured");
663			return -1;
664		}
665		shared_secret = conf->auth_server->shared_secret;
666		shared_secret_len = conf->auth_server->shared_secret_len;
667		radius_msg_finish(msg, shared_secret, shared_secret_len);
668		name = "authentication";
669		s = radius->auth_sock;
670		conf->auth_server->requests++;
671	}
672
673	hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
674		       HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s "
675		       "server", name);
676	if (conf->msg_dumps)
677		radius_msg_dump(msg);
678
679	buf = radius_msg_get_buf(msg);
680	res = send(s, wpabuf_head(buf), wpabuf_len(buf), 0);
681	if (res < 0)
682		radius_client_handle_send_error(radius, s, msg_type);
683
684	radius_client_list_add(radius, msg, msg_type, shared_secret,
685			       shared_secret_len, addr);
686
687	return res;
688}
689
690
691static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx)
692{
693	struct radius_client_data *radius = eloop_ctx;
694	struct hostapd_radius_servers *conf = radius->conf;
695	RadiusType msg_type = (RadiusType) sock_ctx;
696	int len, roundtrip;
697	unsigned char buf[3000];
698	struct radius_msg *msg;
699	struct radius_hdr *hdr;
700	struct radius_rx_handler *handlers;
701	size_t num_handlers, i;
702	struct radius_msg_list *req, *prev_req;
703	struct os_time now;
704	struct hostapd_radius_server *rconf;
705	int invalid_authenticator = 0;
706
707	if (msg_type == RADIUS_ACCT) {
708		handlers = radius->acct_handlers;
709		num_handlers = radius->num_acct_handlers;
710		rconf = conf->acct_server;
711	} else {
712		handlers = radius->auth_handlers;
713		num_handlers = radius->num_auth_handlers;
714		rconf = conf->auth_server;
715	}
716
717	len = recv(sock, buf, sizeof(buf), MSG_DONTWAIT);
718	if (len < 0) {
719		perror("recv[RADIUS]");
720		return;
721	}
722	hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
723		       HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS "
724		       "server", len);
725	if (len == sizeof(buf)) {
726		printf("Possibly too long UDP frame for our buffer - "
727		       "dropping it\n");
728		return;
729	}
730
731	msg = radius_msg_parse(buf, len);
732	if (msg == NULL) {
733		printf("Parsing incoming RADIUS frame failed\n");
734		rconf->malformed_responses++;
735		return;
736	}
737	hdr = radius_msg_get_hdr(msg);
738
739	hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
740		       HOSTAPD_LEVEL_DEBUG, "Received RADIUS message");
741	if (conf->msg_dumps)
742		radius_msg_dump(msg);
743
744	switch (hdr->code) {
745	case RADIUS_CODE_ACCESS_ACCEPT:
746		rconf->access_accepts++;
747		break;
748	case RADIUS_CODE_ACCESS_REJECT:
749		rconf->access_rejects++;
750		break;
751	case RADIUS_CODE_ACCESS_CHALLENGE:
752		rconf->access_challenges++;
753		break;
754	case RADIUS_CODE_ACCOUNTING_RESPONSE:
755		rconf->responses++;
756		break;
757	}
758
759	prev_req = NULL;
760	req = radius->msgs;
761	while (req) {
762		/* TODO: also match by src addr:port of the packet when using
763		 * alternative RADIUS servers (?) */
764		if ((req->msg_type == msg_type ||
765		     (req->msg_type == RADIUS_ACCT_INTERIM &&
766		      msg_type == RADIUS_ACCT)) &&
767		    radius_msg_get_hdr(req->msg)->identifier ==
768		    hdr->identifier)
769			break;
770
771		prev_req = req;
772		req = req->next;
773	}
774
775	if (req == NULL) {
776		hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
777			       HOSTAPD_LEVEL_DEBUG,
778			       "No matching RADIUS request found (type=%d "
779			       "id=%d) - dropping packet",
780			       msg_type, hdr->identifier);
781		goto fail;
782	}
783
784	os_get_time(&now);
785	roundtrip = (now.sec - req->last_attempt.sec) * 100 +
786		(now.usec - req->last_attempt.usec) / 10000;
787	hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
788		       HOSTAPD_LEVEL_DEBUG,
789		       "Received RADIUS packet matched with a pending "
790		       "request, round trip time %d.%02d sec",
791		       roundtrip / 100, roundtrip % 100);
792	rconf->round_trip_time = roundtrip;
793
794	/* Remove ACKed RADIUS packet from retransmit list */
795	if (prev_req)
796		prev_req->next = req->next;
797	else
798		radius->msgs = req->next;
799	radius->num_msgs--;
800
801	for (i = 0; i < num_handlers; i++) {
802		RadiusRxResult res;
803		res = handlers[i].handler(msg, req->msg, req->shared_secret,
804					  req->shared_secret_len,
805					  handlers[i].data);
806		switch (res) {
807		case RADIUS_RX_PROCESSED:
808			radius_msg_free(msg);
809			/* continue */
810		case RADIUS_RX_QUEUED:
811			radius_client_msg_free(req);
812			return;
813		case RADIUS_RX_INVALID_AUTHENTICATOR:
814			invalid_authenticator++;
815			/* continue */
816		case RADIUS_RX_UNKNOWN:
817			/* continue with next handler */
818			break;
819		}
820	}
821
822	if (invalid_authenticator)
823		rconf->bad_authenticators++;
824	else
825		rconf->unknown_types++;
826	hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS,
827		       HOSTAPD_LEVEL_DEBUG, "No RADIUS RX handler found "
828		       "(type=%d code=%d id=%d)%s - dropping packet",
829		       msg_type, hdr->code, hdr->identifier,
830		       invalid_authenticator ? " [INVALID AUTHENTICATOR]" :
831		       "");
832	radius_client_msg_free(req);
833
834 fail:
835	radius_msg_free(msg);
836}
837
838
839/**
840 * radius_client_get_id - Get an identifier for a new RADIUS message
841 * @radius: RADIUS client context from radius_client_init()
842 * Returns: Allocated identifier
843 *
844 * This function is used to fetch a unique (among pending requests) identifier
845 * for a new RADIUS message.
846 */
847u8 radius_client_get_id(struct radius_client_data *radius)
848{
849	struct radius_msg_list *entry, *prev, *_remove;
850	u8 id = radius->next_radius_identifier++;
851
852	/* remove entries with matching id from retransmit list to avoid
853	 * using new reply from the RADIUS server with an old request */
854	entry = radius->msgs;
855	prev = NULL;
856	while (entry) {
857		if (radius_msg_get_hdr(entry->msg)->identifier == id) {
858			hostapd_logger(radius->ctx, entry->addr,
859				       HOSTAPD_MODULE_RADIUS,
860				       HOSTAPD_LEVEL_DEBUG,
861				       "Removing pending RADIUS message, "
862				       "since its id (%d) is reused", id);
863			if (prev)
864				prev->next = entry->next;
865			else
866				radius->msgs = entry->next;
867			_remove = entry;
868		} else {
869			_remove = NULL;
870			prev = entry;
871		}
872		entry = entry->next;
873
874		if (_remove)
875			radius_client_msg_free(_remove);
876	}
877
878	return id;
879}
880
881
882/**
883 * radius_client_flush - Flush all pending RADIUS client messages
884 * @radius: RADIUS client context from radius_client_init()
885 * @only_auth: Whether only authentication messages are removed
886 */
887void radius_client_flush(struct radius_client_data *radius, int only_auth)
888{
889	struct radius_msg_list *entry, *prev, *tmp;
890
891	if (!radius)
892		return;
893
894	prev = NULL;
895	entry = radius->msgs;
896
897	while (entry) {
898		if (!only_auth || entry->msg_type == RADIUS_AUTH) {
899			if (prev)
900				prev->next = entry->next;
901			else
902				radius->msgs = entry->next;
903
904			tmp = entry;
905			entry = entry->next;
906			radius_client_msg_free(tmp);
907			radius->num_msgs--;
908		} else {
909			prev = entry;
910			entry = entry->next;
911		}
912	}
913
914	if (radius->msgs == NULL)
915		eloop_cancel_timeout(radius_client_timer, radius, NULL);
916}
917
918
919static void radius_client_update_acct_msgs(struct radius_client_data *radius,
920					   const u8 *shared_secret,
921					   size_t shared_secret_len)
922{
923	struct radius_msg_list *entry;
924
925	if (!radius)
926		return;
927
928	for (entry = radius->msgs; entry; entry = entry->next) {
929		if (entry->msg_type == RADIUS_ACCT) {
930			entry->shared_secret = shared_secret;
931			entry->shared_secret_len = shared_secret_len;
932			radius_msg_finish_acct(entry->msg, shared_secret,
933					       shared_secret_len);
934		}
935	}
936}
937
938
939static int
940radius_change_server(struct radius_client_data *radius,
941		     struct hostapd_radius_server *nserv,
942		     struct hostapd_radius_server *oserv,
943		     int sock, int sock6, int auth)
944{
945	struct sockaddr_in serv, claddr;
946#ifdef CONFIG_IPV6
947	struct sockaddr_in6 serv6, claddr6;
948#endif /* CONFIG_IPV6 */
949	struct sockaddr *addr, *cl_addr;
950	socklen_t addrlen, claddrlen;
951	char abuf[50];
952	int sel_sock;
953	struct radius_msg_list *entry;
954	struct hostapd_radius_servers *conf = radius->conf;
955
956	hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS,
957		       HOSTAPD_LEVEL_INFO,
958		       "%s server %s:%d",
959		       auth ? "Authentication" : "Accounting",
960		       hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)),
961		       nserv->port);
962
963	if (!oserv || nserv->shared_secret_len != oserv->shared_secret_len ||
964	    os_memcmp(nserv->shared_secret, oserv->shared_secret,
965		      nserv->shared_secret_len) != 0) {
966		/* Pending RADIUS packets used different shared secret, so
967		 * they need to be modified. Update accounting message
968		 * authenticators here. Authentication messages are removed
969		 * since they would require more changes and the new RADIUS
970		 * server may not be prepared to receive them anyway due to
971		 * missing state information. Client will likely retry
972		 * authentication, so this should not be an issue. */
973		if (auth)
974			radius_client_flush(radius, 1);
975		else {
976			radius_client_update_acct_msgs(
977				radius, nserv->shared_secret,
978				nserv->shared_secret_len);
979		}
980	}
981
982	/* Reset retry counters for the new server */
983	for (entry = radius->msgs; entry; entry = entry->next) {
984		if ((auth && entry->msg_type != RADIUS_AUTH) ||
985		    (!auth && entry->msg_type != RADIUS_ACCT))
986			continue;
987		entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT;
988		entry->attempts = 0;
989		entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2;
990	}
991
992	if (radius->msgs) {
993		eloop_cancel_timeout(radius_client_timer, radius, NULL);
994		eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0,
995				       radius_client_timer, radius, NULL);
996	}
997
998	switch (nserv->addr.af) {
999	case AF_INET:
1000		os_memset(&serv, 0, sizeof(serv));
1001		serv.sin_family = AF_INET;
1002		serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr;
1003		serv.sin_port = htons(nserv->port);
1004		addr = (struct sockaddr *) &serv;
1005		addrlen = sizeof(serv);
1006		sel_sock = sock;
1007		break;
1008#ifdef CONFIG_IPV6
1009	case AF_INET6:
1010		os_memset(&serv6, 0, sizeof(serv6));
1011		serv6.sin6_family = AF_INET6;
1012		os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6,
1013			  sizeof(struct in6_addr));
1014		serv6.sin6_port = htons(nserv->port);
1015		addr = (struct sockaddr *) &serv6;
1016		addrlen = sizeof(serv6);
1017		sel_sock = sock6;
1018		break;
1019#endif /* CONFIG_IPV6 */
1020	default:
1021		return -1;
1022	}
1023
1024	if (conf->force_client_addr) {
1025		switch (conf->client_addr.af) {
1026		case AF_INET:
1027			os_memset(&claddr, 0, sizeof(claddr));
1028			claddr.sin_family = AF_INET;
1029			claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr;
1030			claddr.sin_port = htons(0);
1031			cl_addr = (struct sockaddr *) &claddr;
1032			claddrlen = sizeof(claddr);
1033			break;
1034#ifdef CONFIG_IPV6
1035		case AF_INET6:
1036			os_memset(&claddr6, 0, sizeof(claddr6));
1037			claddr6.sin6_family = AF_INET6;
1038			os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6,
1039				  sizeof(struct in6_addr));
1040			claddr6.sin6_port = htons(0);
1041			cl_addr = (struct sockaddr *) &claddr6;
1042			claddrlen = sizeof(claddr6);
1043			break;
1044#endif /* CONFIG_IPV6 */
1045		default:
1046			return -1;
1047		}
1048
1049		if (bind(sel_sock, cl_addr, claddrlen) < 0) {
1050			perror("bind[radius]");
1051			return -1;
1052		}
1053	}
1054
1055	if (connect(sel_sock, addr, addrlen) < 0) {
1056		perror("connect[radius]");
1057		return -1;
1058	}
1059
1060#ifndef CONFIG_NATIVE_WINDOWS
1061	switch (nserv->addr.af) {
1062	case AF_INET:
1063		claddrlen = sizeof(claddr);
1064		getsockname(sel_sock, (struct sockaddr *) &claddr, &claddrlen);
1065		wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1066			   inet_ntoa(claddr.sin_addr), ntohs(claddr.sin_port));
1067		break;
1068#ifdef CONFIG_IPV6
1069	case AF_INET6: {
1070		claddrlen = sizeof(claddr6);
1071		getsockname(sel_sock, (struct sockaddr *) &claddr6,
1072			    &claddrlen);
1073		wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u",
1074			   inet_ntop(AF_INET6, &claddr6.sin6_addr,
1075				     abuf, sizeof(abuf)),
1076			   ntohs(claddr6.sin6_port));
1077		break;
1078	}
1079#endif /* CONFIG_IPV6 */
1080	}
1081#endif /* CONFIG_NATIVE_WINDOWS */
1082
1083	if (auth)
1084		radius->auth_sock = sel_sock;
1085	else
1086		radius->acct_sock = sel_sock;
1087
1088	return 0;
1089}
1090
1091
1092static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx)
1093{
1094	struct radius_client_data *radius = eloop_ctx;
1095	struct hostapd_radius_servers *conf = radius->conf;
1096	struct hostapd_radius_server *oserv;
1097
1098	if (radius->auth_sock >= 0 && conf->auth_servers &&
1099	    conf->auth_server != conf->auth_servers) {
1100		oserv = conf->auth_server;
1101		conf->auth_server = conf->auth_servers;
1102		radius_change_server(radius, conf->auth_server, oserv,
1103				     radius->auth_serv_sock,
1104				     radius->auth_serv_sock6, 1);
1105	}
1106
1107	if (radius->acct_sock >= 0 && conf->acct_servers &&
1108	    conf->acct_server != conf->acct_servers) {
1109		oserv = conf->acct_server;
1110		conf->acct_server = conf->acct_servers;
1111		radius_change_server(radius, conf->acct_server, oserv,
1112				     radius->acct_serv_sock,
1113				     radius->acct_serv_sock6, 0);
1114	}
1115
1116	if (conf->retry_primary_interval)
1117		eloop_register_timeout(conf->retry_primary_interval, 0,
1118				       radius_retry_primary_timer, radius,
1119				       NULL);
1120}
1121
1122
1123static int radius_client_disable_pmtu_discovery(int s)
1124{
1125	int r = -1;
1126#if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
1127	/* Turn off Path MTU discovery on IPv4/UDP sockets. */
1128	int action = IP_PMTUDISC_DONT;
1129	r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
1130		       sizeof(action));
1131	if (r == -1)
1132		wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: "
1133			   "%s", strerror(errno));
1134#endif
1135	return r;
1136}
1137
1138
1139static int radius_client_init_auth(struct radius_client_data *radius)
1140{
1141	struct hostapd_radius_servers *conf = radius->conf;
1142	int ok = 0;
1143
1144	radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1145	if (radius->auth_serv_sock < 0)
1146		perror("socket[PF_INET,SOCK_DGRAM]");
1147	else {
1148		radius_client_disable_pmtu_discovery(radius->auth_serv_sock);
1149		ok++;
1150	}
1151
1152#ifdef CONFIG_IPV6
1153	radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1154	if (radius->auth_serv_sock6 < 0)
1155		perror("socket[PF_INET6,SOCK_DGRAM]");
1156	else
1157		ok++;
1158#endif /* CONFIG_IPV6 */
1159
1160	if (ok == 0)
1161		return -1;
1162
1163	radius_change_server(radius, conf->auth_server, NULL,
1164			     radius->auth_serv_sock, radius->auth_serv_sock6,
1165			     1);
1166
1167	if (radius->auth_serv_sock >= 0 &&
1168	    eloop_register_read_sock(radius->auth_serv_sock,
1169				     radius_client_receive, radius,
1170				     (void *) RADIUS_AUTH)) {
1171		printf("Could not register read socket for authentication "
1172		       "server\n");
1173		return -1;
1174	}
1175
1176#ifdef CONFIG_IPV6
1177	if (radius->auth_serv_sock6 >= 0 &&
1178	    eloop_register_read_sock(radius->auth_serv_sock6,
1179				     radius_client_receive, radius,
1180				     (void *) RADIUS_AUTH)) {
1181		printf("Could not register read socket for authentication "
1182		       "server\n");
1183		return -1;
1184	}
1185#endif /* CONFIG_IPV6 */
1186
1187	return 0;
1188}
1189
1190
1191static int radius_client_init_acct(struct radius_client_data *radius)
1192{
1193	struct hostapd_radius_servers *conf = radius->conf;
1194	int ok = 0;
1195
1196	radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0);
1197	if (radius->acct_serv_sock < 0)
1198		perror("socket[PF_INET,SOCK_DGRAM]");
1199	else {
1200		radius_client_disable_pmtu_discovery(radius->acct_serv_sock);
1201		ok++;
1202	}
1203
1204#ifdef CONFIG_IPV6
1205	radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0);
1206	if (radius->acct_serv_sock6 < 0)
1207		perror("socket[PF_INET6,SOCK_DGRAM]");
1208	else
1209		ok++;
1210#endif /* CONFIG_IPV6 */
1211
1212	if (ok == 0)
1213		return -1;
1214
1215	radius_change_server(radius, conf->acct_server, NULL,
1216			     radius->acct_serv_sock, radius->acct_serv_sock6,
1217			     0);
1218
1219	if (radius->acct_serv_sock >= 0 &&
1220	    eloop_register_read_sock(radius->acct_serv_sock,
1221				     radius_client_receive, radius,
1222				     (void *) RADIUS_ACCT)) {
1223		printf("Could not register read socket for accounting "
1224		       "server\n");
1225		return -1;
1226	}
1227
1228#ifdef CONFIG_IPV6
1229	if (radius->acct_serv_sock6 >= 0 &&
1230	    eloop_register_read_sock(radius->acct_serv_sock6,
1231				     radius_client_receive, radius,
1232				     (void *) RADIUS_ACCT)) {
1233		printf("Could not register read socket for accounting "
1234		       "server\n");
1235		return -1;
1236	}
1237#endif /* CONFIG_IPV6 */
1238
1239	return 0;
1240}
1241
1242
1243/**
1244 * radius_client_init - Initialize RADIUS client
1245 * @ctx: Callback context to be used in hostapd_logger() calls
1246 * @conf: RADIUS client configuration (RADIUS servers)
1247 * Returns: Pointer to private RADIUS client context or %NULL on failure
1248 *
1249 * The caller is responsible for keeping the configuration data available for
1250 * the lifetime of the RADIUS client, i.e., until radius_client_deinit() is
1251 * called for the returned context pointer.
1252 */
1253struct radius_client_data *
1254radius_client_init(void *ctx, struct hostapd_radius_servers *conf)
1255{
1256	struct radius_client_data *radius;
1257
1258	radius = os_zalloc(sizeof(struct radius_client_data));
1259	if (radius == NULL)
1260		return NULL;
1261
1262	radius->ctx = ctx;
1263	radius->conf = conf;
1264	radius->auth_serv_sock = radius->acct_serv_sock =
1265		radius->auth_serv_sock6 = radius->acct_serv_sock6 =
1266		radius->auth_sock = radius->acct_sock = -1;
1267
1268	if (conf->auth_server && radius_client_init_auth(radius)) {
1269		radius_client_deinit(radius);
1270		return NULL;
1271	}
1272
1273	if (conf->acct_server && radius_client_init_acct(radius)) {
1274		radius_client_deinit(radius);
1275		return NULL;
1276	}
1277
1278	if (conf->retry_primary_interval)
1279		eloop_register_timeout(conf->retry_primary_interval, 0,
1280				       radius_retry_primary_timer, radius,
1281				       NULL);
1282
1283	return radius;
1284}
1285
1286
1287/**
1288 * radius_client_deinit - Deinitialize RADIUS client
1289 * @radius: RADIUS client context from radius_client_init()
1290 */
1291void radius_client_deinit(struct radius_client_data *radius)
1292{
1293	if (!radius)
1294		return;
1295
1296	if (radius->auth_serv_sock >= 0)
1297		eloop_unregister_read_sock(radius->auth_serv_sock);
1298	if (radius->acct_serv_sock >= 0)
1299		eloop_unregister_read_sock(radius->acct_serv_sock);
1300#ifdef CONFIG_IPV6
1301	if (radius->auth_serv_sock6 >= 0)
1302		eloop_unregister_read_sock(radius->auth_serv_sock6);
1303	if (radius->acct_serv_sock6 >= 0)
1304		eloop_unregister_read_sock(radius->acct_serv_sock6);
1305#endif /* CONFIG_IPV6 */
1306
1307	eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL);
1308
1309	radius_client_flush(radius, 0);
1310	os_free(radius->auth_handlers);
1311	os_free(radius->acct_handlers);
1312	os_free(radius);
1313}
1314
1315
1316/**
1317 * radius_client_flush_auth - Flush pending RADIUS messages for an address
1318 * @radius: RADIUS client context from radius_client_init()
1319 * @addr: MAC address of the related device
1320 *
1321 * This function can be used to remove pending RADIUS authentication messages
1322 * that are related to a specific device. The addr parameter is matched with
1323 * the one used in radius_client_send() call that was used to transmit the
1324 * authentication request.
1325 */
1326void radius_client_flush_auth(struct radius_client_data *radius,
1327			      const u8 *addr)
1328{
1329	struct radius_msg_list *entry, *prev, *tmp;
1330
1331	prev = NULL;
1332	entry = radius->msgs;
1333	while (entry) {
1334		if (entry->msg_type == RADIUS_AUTH &&
1335		    os_memcmp(entry->addr, addr, ETH_ALEN) == 0) {
1336			hostapd_logger(radius->ctx, addr,
1337				       HOSTAPD_MODULE_RADIUS,
1338				       HOSTAPD_LEVEL_DEBUG,
1339				       "Removing pending RADIUS authentication"
1340				       " message for removed client");
1341
1342			if (prev)
1343				prev->next = entry->next;
1344			else
1345				radius->msgs = entry->next;
1346
1347			tmp = entry;
1348			entry = entry->next;
1349			radius_client_msg_free(tmp);
1350			radius->num_msgs--;
1351			continue;
1352		}
1353
1354		prev = entry;
1355		entry = entry->next;
1356	}
1357}
1358
1359
1360static int radius_client_dump_auth_server(char *buf, size_t buflen,
1361					  struct hostapd_radius_server *serv,
1362					  struct radius_client_data *cli)
1363{
1364	int pending = 0;
1365	struct radius_msg_list *msg;
1366	char abuf[50];
1367
1368	if (cli) {
1369		for (msg = cli->msgs; msg; msg = msg->next) {
1370			if (msg->msg_type == RADIUS_AUTH)
1371				pending++;
1372		}
1373	}
1374
1375	return os_snprintf(buf, buflen,
1376			   "radiusAuthServerIndex=%d\n"
1377			   "radiusAuthServerAddress=%s\n"
1378			   "radiusAuthClientServerPortNumber=%d\n"
1379			   "radiusAuthClientRoundTripTime=%d\n"
1380			   "radiusAuthClientAccessRequests=%u\n"
1381			   "radiusAuthClientAccessRetransmissions=%u\n"
1382			   "radiusAuthClientAccessAccepts=%u\n"
1383			   "radiusAuthClientAccessRejects=%u\n"
1384			   "radiusAuthClientAccessChallenges=%u\n"
1385			   "radiusAuthClientMalformedAccessResponses=%u\n"
1386			   "radiusAuthClientBadAuthenticators=%u\n"
1387			   "radiusAuthClientPendingRequests=%u\n"
1388			   "radiusAuthClientTimeouts=%u\n"
1389			   "radiusAuthClientUnknownTypes=%u\n"
1390			   "radiusAuthClientPacketsDropped=%u\n",
1391			   serv->index,
1392			   hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1393			   serv->port,
1394			   serv->round_trip_time,
1395			   serv->requests,
1396			   serv->retransmissions,
1397			   serv->access_accepts,
1398			   serv->access_rejects,
1399			   serv->access_challenges,
1400			   serv->malformed_responses,
1401			   serv->bad_authenticators,
1402			   pending,
1403			   serv->timeouts,
1404			   serv->unknown_types,
1405			   serv->packets_dropped);
1406}
1407
1408
1409static int radius_client_dump_acct_server(char *buf, size_t buflen,
1410					  struct hostapd_radius_server *serv,
1411					  struct radius_client_data *cli)
1412{
1413	int pending = 0;
1414	struct radius_msg_list *msg;
1415	char abuf[50];
1416
1417	if (cli) {
1418		for (msg = cli->msgs; msg; msg = msg->next) {
1419			if (msg->msg_type == RADIUS_ACCT ||
1420			    msg->msg_type == RADIUS_ACCT_INTERIM)
1421				pending++;
1422		}
1423	}
1424
1425	return os_snprintf(buf, buflen,
1426			   "radiusAccServerIndex=%d\n"
1427			   "radiusAccServerAddress=%s\n"
1428			   "radiusAccClientServerPortNumber=%d\n"
1429			   "radiusAccClientRoundTripTime=%d\n"
1430			   "radiusAccClientRequests=%u\n"
1431			   "radiusAccClientRetransmissions=%u\n"
1432			   "radiusAccClientResponses=%u\n"
1433			   "radiusAccClientMalformedResponses=%u\n"
1434			   "radiusAccClientBadAuthenticators=%u\n"
1435			   "radiusAccClientPendingRequests=%u\n"
1436			   "radiusAccClientTimeouts=%u\n"
1437			   "radiusAccClientUnknownTypes=%u\n"
1438			   "radiusAccClientPacketsDropped=%u\n",
1439			   serv->index,
1440			   hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)),
1441			   serv->port,
1442			   serv->round_trip_time,
1443			   serv->requests,
1444			   serv->retransmissions,
1445			   serv->responses,
1446			   serv->malformed_responses,
1447			   serv->bad_authenticators,
1448			   pending,
1449			   serv->timeouts,
1450			   serv->unknown_types,
1451			   serv->packets_dropped);
1452}
1453
1454
1455/**
1456 * radius_client_get_mib - Get RADIUS client MIB information
1457 * @radius: RADIUS client context from radius_client_init()
1458 * @buf: Buffer for returning MIB data in text format
1459 * @buflen: Maximum buf length in octets
1460 * Returns: Number of octets written into the buffer
1461 */
1462int radius_client_get_mib(struct radius_client_data *radius, char *buf,
1463			  size_t buflen)
1464{
1465	struct hostapd_radius_servers *conf = radius->conf;
1466	int i;
1467	struct hostapd_radius_server *serv;
1468	int count = 0;
1469
1470	if (conf->auth_servers) {
1471		for (i = 0; i < conf->num_auth_servers; i++) {
1472			serv = &conf->auth_servers[i];
1473			count += radius_client_dump_auth_server(
1474				buf + count, buflen - count, serv,
1475				serv == conf->auth_server ?
1476				radius : NULL);
1477		}
1478	}
1479
1480	if (conf->acct_servers) {
1481		for (i = 0; i < conf->num_acct_servers; i++) {
1482			serv = &conf->acct_servers[i];
1483			count += radius_client_dump_acct_server(
1484				buf + count, buflen - count, serv,
1485				serv == conf->acct_server ?
1486				radius : NULL);
1487		}
1488	}
1489
1490	return count;
1491}
1492