ctrl_iface_unix.c revision ad266fb3da6083126e7619e525153839b918aa44 
1/*
2 * WPA Supplicant / UNIX domain socket -based control interface
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "includes.h"
10#include <sys/un.h>
11#include <sys/stat.h>
12#include <grp.h>
13#include <stddef.h>
14#ifdef ANDROID
15#include <cutils/sockets.h>
16#endif /* ANDROID */
17
18#include "utils/common.h"
19#include "utils/eloop.h"
20#include "utils/list.h"
21#include "eapol_supp/eapol_supp_sm.h"
22#include "config.h"
23#include "wpa_supplicant_i.h"
24#include "ctrl_iface.h"
25
26/* Per-interface ctrl_iface */
27
28/**
29 * struct wpa_ctrl_dst - Internal data structure of control interface monitors
30 *
31 * This structure is used to store information about registered control
32 * interface monitors into struct wpa_supplicant. This data is private to
33 * ctrl_iface_unix.c and should not be touched directly from other files.
34 */
35struct wpa_ctrl_dst {
36	struct dl_list list;
37	struct sockaddr_un addr;
38	socklen_t addrlen;
39	int debug_level;
40	int errors;
41};
42
43
44struct ctrl_iface_priv {
45	struct wpa_supplicant *wpa_s;
46	int sock;
47	struct dl_list ctrl_dst;
48};
49
50
51static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
52					   int level, const char *buf,
53					   size_t len);
54
55
56static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
57					    struct sockaddr_un *from,
58					    socklen_t fromlen)
59{
60	struct wpa_ctrl_dst *dst;
61
62	dst = os_zalloc(sizeof(*dst));
63	if (dst == NULL)
64		return -1;
65	os_memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
66	dst->addrlen = fromlen;
67	dst->debug_level = MSG_INFO;
68	dl_list_add(&priv->ctrl_dst, &dst->list);
69	wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
70		    (u8 *) from->sun_path,
71		    fromlen - offsetof(struct sockaddr_un, sun_path));
72	return 0;
73}
74
75
76static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
77					    struct sockaddr_un *from,
78					    socklen_t fromlen)
79{
80	struct wpa_ctrl_dst *dst;
81
82	dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
83		if (fromlen == dst->addrlen &&
84		    os_memcmp(from->sun_path, dst->addr.sun_path,
85			      fromlen - offsetof(struct sockaddr_un, sun_path))
86		    == 0) {
87			dl_list_del(&dst->list);
88			os_free(dst);
89			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
90				    (u8 *) from->sun_path,
91				    fromlen -
92				    offsetof(struct sockaddr_un, sun_path));
93			return 0;
94		}
95	}
96	return -1;
97}
98
99
100static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
101					   struct sockaddr_un *from,
102					   socklen_t fromlen,
103					   char *level)
104{
105	struct wpa_ctrl_dst *dst;
106
107	wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
108
109	dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
110		if (fromlen == dst->addrlen &&
111		    os_memcmp(from->sun_path, dst->addr.sun_path,
112			      fromlen - offsetof(struct sockaddr_un, sun_path))
113		    == 0) {
114			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
115				    "level", (u8 *) from->sun_path,
116				    fromlen -
117				    offsetof(struct sockaddr_un, sun_path));
118			dst->debug_level = atoi(level);
119			return 0;
120		}
121	}
122
123	return -1;
124}
125
126
127static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
128					      void *sock_ctx)
129{
130	struct wpa_supplicant *wpa_s = eloop_ctx;
131	struct ctrl_iface_priv *priv = sock_ctx;
132	char buf[4096];
133	int res;
134	struct sockaddr_un from;
135	socklen_t fromlen = sizeof(from);
136	char *reply = NULL;
137	size_t reply_len = 0;
138	int new_attached = 0;
139
140	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
141		       (struct sockaddr *) &from, &fromlen);
142	if (res < 0) {
143		perror("recvfrom(ctrl_iface)");
144		return;
145	}
146	buf[res] = '\0';
147
148	if (os_strcmp(buf, "ATTACH") == 0) {
149		if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
150			reply_len = 1;
151		else {
152			new_attached = 1;
153			reply_len = 2;
154		}
155	} else if (os_strcmp(buf, "DETACH") == 0) {
156		if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
157			reply_len = 1;
158		else
159			reply_len = 2;
160	} else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
161		if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
162						    buf + 6))
163			reply_len = 1;
164		else
165			reply_len = 2;
166	} else {
167#if defined(CONFIG_P2P) && defined(ANDROID_P2P)
168		char *ifname, *ifend;
169
170		ifname = os_strstr(buf, "interface=");
171		if (ifname != NULL) {
172			ifend = os_strchr(ifname + 10, ' ');
173			if (ifend != NULL)
174				*ifend++ = '\0';
175			else
176				ifend = "";
177			wpa_printf(MSG_DEBUG, "Found %s", ifname);
178			for (wpa_s = wpa_s->global->ifaces; wpa_s; wpa_s = wpa_s->next) {
179				if (os_strcmp(wpa_s->ifname, ifname + 10) == 0)
180					break;
181			}
182			if (wpa_s == NULL) {
183				wpa_printf(MSG_ERROR, "P2P: %s does not exist", ifname);
184				wpa_s = eloop_ctx;
185			}
186			os_memmove(ifname, ifend, strlen(ifend) + 1);
187		}
188		wpa_printf(MSG_INFO, "wpa_s %p cmd %s", wpa_s, buf);
189#endif /* defined CONFIG_P2P && defined ANDROID_P2P */
190		reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
191							  &reply_len);
192	}
193
194	if (reply) {
195		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
196		       fromlen);
197		os_free(reply);
198	} else if (reply_len == 1) {
199		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
200		       fromlen);
201	} else if (reply_len == 2) {
202		sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
203		       fromlen);
204	}
205
206	if (new_attached)
207		eapol_sm_notify_ctrl_attached(wpa_s->eapol);
208}
209
210
211static char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
212{
213	char *buf;
214	size_t len;
215	char *pbuf, *dir = NULL, *gid_str = NULL;
216	int res;
217
218	if (wpa_s->conf->ctrl_interface == NULL)
219		return NULL;
220
221	pbuf = os_strdup(wpa_s->conf->ctrl_interface);
222	if (pbuf == NULL)
223		return NULL;
224	if (os_strncmp(pbuf, "DIR=", 4) == 0) {
225		dir = pbuf + 4;
226		gid_str = os_strstr(dir, " GROUP=");
227		if (gid_str) {
228			*gid_str = '\0';
229			gid_str += 7;
230		}
231	} else
232		dir = pbuf;
233
234	len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
235	buf = os_malloc(len);
236	if (buf == NULL) {
237		os_free(pbuf);
238		return NULL;
239	}
240
241	res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
242	if (res < 0 || (size_t) res >= len) {
243		os_free(pbuf);
244		os_free(buf);
245		return NULL;
246	}
247#ifdef __CYGWIN__
248	{
249		/* Windows/WinPcap uses interface names that are not suitable
250		 * as a file name - convert invalid chars to underscores */
251		char *pos = buf;
252		while (*pos) {
253			if (*pos == '\\')
254				*pos = '_';
255			pos++;
256		}
257	}
258#endif /* __CYGWIN__ */
259	os_free(pbuf);
260	return buf;
261}
262
263
264static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
265					     const char *txt, size_t len)
266{
267	struct wpa_supplicant *wpa_s = ctx;
268	if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
269		return;
270	wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
271}
272
273
274struct ctrl_iface_priv *
275wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
276{
277	struct ctrl_iface_priv *priv;
278	struct sockaddr_un addr;
279	char *fname = NULL;
280	gid_t gid = 0;
281	int gid_set = 0;
282	char *buf, *dir = NULL, *gid_str = NULL;
283	struct group *grp;
284	char *endp;
285
286	priv = os_zalloc(sizeof(*priv));
287	if (priv == NULL)
288		return NULL;
289	dl_list_init(&priv->ctrl_dst);
290	priv->wpa_s = wpa_s;
291	priv->sock = -1;
292
293	if (wpa_s->conf->ctrl_interface == NULL)
294		return priv;
295
296	buf = os_strdup(wpa_s->conf->ctrl_interface);
297	if (buf == NULL)
298		goto fail;
299#ifdef ANDROID
300	os_snprintf(addr.sun_path, sizeof(addr.sun_path), "wpa_%s",
301		    wpa_s->conf->ctrl_interface);
302	priv->sock = android_get_control_socket(addr.sun_path);
303	if (priv->sock >= 0)
304		goto havesock;
305#endif /* ANDROID */
306	if (os_strncmp(buf, "DIR=", 4) == 0) {
307		dir = buf + 4;
308		gid_str = os_strstr(dir, " GROUP=");
309		if (gid_str) {
310			*gid_str = '\0';
311			gid_str += 7;
312		}
313	} else {
314		dir = buf;
315		gid_str = wpa_s->conf->ctrl_interface_group;
316	}
317
318	if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
319		if (errno == EEXIST) {
320			wpa_printf(MSG_DEBUG, "Using existing control "
321				   "interface directory.");
322		} else {
323			perror("mkdir[ctrl_interface]");
324			goto fail;
325		}
326	}
327
328	if (gid_str) {
329		grp = getgrnam(gid_str);
330		if (grp) {
331			gid = grp->gr_gid;
332			gid_set = 1;
333			wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
334				   " (from group name '%s')",
335				   (int) gid, gid_str);
336		} else {
337			/* Group name not found - try to parse this as gid */
338			gid = strtol(gid_str, &endp, 10);
339			if (*gid_str == '\0' || *endp != '\0') {
340				wpa_printf(MSG_ERROR, "CTRL: Invalid group "
341					   "'%s'", gid_str);
342				goto fail;
343			}
344			gid_set = 1;
345			wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
346				   (int) gid);
347		}
348	}
349
350	if (gid_set && chown(dir, -1, gid) < 0) {
351		perror("chown[ctrl_interface]");
352		goto fail;
353	}
354
355	/* Make sure the group can enter and read the directory */
356	if (gid_set &&
357	    chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
358		wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
359			   strerror(errno));
360		goto fail;
361	}
362
363	if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
364	    sizeof(addr.sun_path)) {
365		wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
366		goto fail;
367	}
368
369	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
370	if (priv->sock < 0) {
371		perror("socket(PF_UNIX)");
372		goto fail;
373	}
374
375	os_memset(&addr, 0, sizeof(addr));
376#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
377	addr.sun_len = sizeof(addr);
378#endif /* __FreeBSD__ */
379	addr.sun_family = AF_UNIX;
380	fname = wpa_supplicant_ctrl_iface_path(wpa_s);
381	if (fname == NULL)
382		goto fail;
383	os_strlcpy(addr.sun_path, fname, sizeof(addr.sun_path));
384	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
385		wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
386			   strerror(errno));
387		if (connect(priv->sock, (struct sockaddr *) &addr,
388			    sizeof(addr)) < 0) {
389			wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
390				   " allow connections - assuming it was left"
391				   "over from forced program termination");
392			if (unlink(fname) < 0) {
393				perror("unlink[ctrl_iface]");
394				wpa_printf(MSG_ERROR, "Could not unlink "
395					   "existing ctrl_iface socket '%s'",
396					   fname);
397				goto fail;
398			}
399			if (bind(priv->sock, (struct sockaddr *) &addr,
400				 sizeof(addr)) < 0) {
401				perror("supp-ctrl-iface-init: bind(PF_UNIX)");
402				goto fail;
403			}
404			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
405				   "ctrl_iface socket '%s'", fname);
406		} else {
407			wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
408				   "be in use - cannot override it");
409			wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
410				   "not used anymore", fname);
411			os_free(fname);
412			fname = NULL;
413			goto fail;
414		}
415	}
416
417	if (gid_set && chown(fname, -1, gid) < 0) {
418		perror("chown[ctrl_interface/ifname]");
419		goto fail;
420	}
421
422	if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
423		perror("chmod[ctrl_interface/ifname]");
424		goto fail;
425	}
426	os_free(fname);
427
428#ifdef ANDROID
429havesock:
430#endif /* ANDROID */
431	eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
432				 wpa_s, priv);
433	wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
434
435	os_free(buf);
436	return priv;
437
438fail:
439	if (priv->sock >= 0)
440		close(priv->sock);
441	os_free(priv);
442	if (fname) {
443		unlink(fname);
444		os_free(fname);
445	}
446	os_free(buf);
447	return NULL;
448}
449
450
451void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
452{
453	struct wpa_ctrl_dst *dst, *prev;
454
455	if (priv->sock > -1) {
456		char *fname;
457		char *buf, *dir = NULL, *gid_str = NULL;
458		eloop_unregister_read_sock(priv->sock);
459		if (!dl_list_empty(&priv->ctrl_dst)) {
460			/*
461			 * Wait a second before closing the control socket if
462			 * there are any attached monitors in order to allow
463			 * them to receive any pending messages.
464			 */
465			wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
466				   "monitors to receive messages");
467			os_sleep(1, 0);
468		}
469		close(priv->sock);
470		priv->sock = -1;
471		fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
472		if (fname) {
473			unlink(fname);
474			os_free(fname);
475		}
476
477		buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
478		if (buf == NULL)
479			goto free_dst;
480		if (os_strncmp(buf, "DIR=", 4) == 0) {
481			dir = buf + 4;
482			gid_str = os_strstr(dir, " GROUP=");
483			if (gid_str) {
484				*gid_str = '\0';
485				gid_str += 7;
486			}
487		} else
488			dir = buf;
489
490		if (rmdir(dir) < 0) {
491			if (errno == ENOTEMPTY) {
492				wpa_printf(MSG_DEBUG, "Control interface "
493					   "directory not empty - leaving it "
494					   "behind");
495			} else {
496				perror("rmdir[ctrl_interface]");
497			}
498		}
499		os_free(buf);
500	}
501
502free_dst:
503	dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
504			      list)
505		os_free(dst);
506	os_free(priv);
507}
508
509
510/**
511 * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
512 * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
513 * @level: Priority level of the message
514 * @buf: Message data
515 * @len: Message length
516 *
517 * Send a packet to all monitor programs attached to the control interface.
518 */
519static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
520					   int level, const char *buf,
521					   size_t len)
522{
523	struct wpa_ctrl_dst *dst, *next;
524	char levelstr[10];
525	int idx, res;
526	struct msghdr msg;
527	struct iovec io[2];
528
529	if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
530		return;
531
532	res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
533	if (res < 0 || (size_t) res >= sizeof(levelstr))
534		return;
535	io[0].iov_base = levelstr;
536	io[0].iov_len = os_strlen(levelstr);
537	io[1].iov_base = (char *) buf;
538	io[1].iov_len = len;
539	os_memset(&msg, 0, sizeof(msg));
540	msg.msg_iov = io;
541	msg.msg_iovlen = 2;
542
543	idx = 0;
544	dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
545			      list) {
546		if (level >= dst->debug_level) {
547			wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
548				    (u8 *) dst->addr.sun_path, dst->addrlen -
549				    offsetof(struct sockaddr_un, sun_path));
550			msg.msg_name = (void *) &dst->addr;
551			msg.msg_namelen = dst->addrlen;
552			if (sendmsg(priv->sock, &msg, 0) < 0) {
553				int _errno = errno;
554				wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
555					   "%d - %s",
556					   idx, errno, strerror(errno));
557				dst->errors++;
558				if (dst->errors > 1000 ||
559				    (_errno != ENOBUFS && dst->errors > 10) ||
560				    _errno == ENOENT) {
561					wpa_supplicant_ctrl_iface_detach(
562						priv, &dst->addr,
563						dst->addrlen);
564				}
565			} else
566				dst->errors = 0;
567		}
568		idx++;
569	}
570}
571
572
573void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
574{
575	char buf[256];
576	int res;
577	struct sockaddr_un from;
578	socklen_t fromlen = sizeof(from);
579
580	for (;;) {
581		wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
582			   "attach", priv->wpa_s->ifname);
583		eloop_wait_for_read_sock(priv->sock);
584
585		res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
586			       (struct sockaddr *) &from, &fromlen);
587		if (res < 0) {
588			perror("recvfrom(ctrl_iface)");
589			continue;
590		}
591		buf[res] = '\0';
592
593		if (os_strcmp(buf, "ATTACH") == 0) {
594			/* handle ATTACH signal of first monitor interface */
595			if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
596							      fromlen)) {
597				sendto(priv->sock, "OK\n", 3, 0,
598				       (struct sockaddr *) &from, fromlen);
599				/* OK to continue */
600				return;
601			} else {
602				sendto(priv->sock, "FAIL\n", 5, 0,
603				       (struct sockaddr *) &from, fromlen);
604			}
605		} else {
606			/* return FAIL for all other signals */
607			sendto(priv->sock, "FAIL\n", 5, 0,
608			       (struct sockaddr *) &from, fromlen);
609		}
610	}
611}
612
613
614/* Global ctrl_iface */
615
616struct ctrl_iface_global_priv {
617	struct wpa_global *global;
618	int sock;
619};
620
621
622static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
623						     void *sock_ctx)
624{
625	struct wpa_global *global = eloop_ctx;
626	char buf[256];
627	int res;
628	struct sockaddr_un from;
629	socklen_t fromlen = sizeof(from);
630	char *reply;
631	size_t reply_len;
632
633	res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
634		       (struct sockaddr *) &from, &fromlen);
635	if (res < 0) {
636		perror("recvfrom(ctrl_iface)");
637		return;
638	}
639	buf[res] = '\0';
640
641	reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
642							 &reply_len);
643
644	if (reply) {
645		sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
646		       fromlen);
647		os_free(reply);
648	} else if (reply_len) {
649		sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
650		       fromlen);
651	}
652}
653
654
655struct ctrl_iface_global_priv *
656wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
657{
658	struct ctrl_iface_global_priv *priv;
659	struct sockaddr_un addr;
660
661	priv = os_zalloc(sizeof(*priv));
662	if (priv == NULL)
663		return NULL;
664	priv->global = global;
665	priv->sock = -1;
666
667	if (global->params.ctrl_interface == NULL)
668		return priv;
669
670#ifdef ANDROID
671	priv->sock = android_get_control_socket(global->params.ctrl_interface);
672	if (priv->sock >= 0)
673		goto havesock;
674#endif /* ANDROID */
675
676	wpa_printf(MSG_DEBUG, "Global control interface '%s'",
677		   global->params.ctrl_interface);
678
679	priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
680	if (priv->sock < 0) {
681		perror("socket(PF_UNIX)");
682		goto fail;
683	}
684
685	os_memset(&addr, 0, sizeof(addr));
686#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
687	addr.sun_len = sizeof(addr);
688#endif /* __FreeBSD__ */
689	addr.sun_family = AF_UNIX;
690	os_strlcpy(addr.sun_path, global->params.ctrl_interface,
691		   sizeof(addr.sun_path));
692	if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
693		perror("supp-global-ctrl-iface-init (will try fixup): "
694		       "bind(PF_UNIX)");
695		if (connect(priv->sock, (struct sockaddr *) &addr,
696			    sizeof(addr)) < 0) {
697			wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
698				   " allow connections - assuming it was left"
699				   "over from forced program termination");
700			if (unlink(global->params.ctrl_interface) < 0) {
701				perror("unlink[ctrl_iface]");
702				wpa_printf(MSG_ERROR, "Could not unlink "
703					   "existing ctrl_iface socket '%s'",
704					   global->params.ctrl_interface);
705				goto fail;
706			}
707			if (bind(priv->sock, (struct sockaddr *) &addr,
708				 sizeof(addr)) < 0) {
709				perror("supp-glb-iface-init: bind(PF_UNIX)");
710				goto fail;
711			}
712			wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
713				   "ctrl_iface socket '%s'",
714				   global->params.ctrl_interface);
715		} else {
716			wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
717				   "be in use - cannot override it");
718			wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
719				   "not used anymore",
720				   global->params.ctrl_interface);
721			goto fail;
722		}
723	}
724
725#ifdef ANDROID
726havesock:
727#endif /* ANDROID */
728	eloop_register_read_sock(priv->sock,
729				 wpa_supplicant_global_ctrl_iface_receive,
730				 global, NULL);
731
732	return priv;
733
734fail:
735	if (priv->sock >= 0)
736		close(priv->sock);
737	os_free(priv);
738	return NULL;
739}
740
741
742void
743wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
744{
745	if (priv->sock >= 0) {
746		eloop_unregister_read_sock(priv->sock);
747		close(priv->sock);
748	}
749	if (priv->global->params.ctrl_interface)
750		unlink(priv->global->params.ctrl_interface);
751	os_free(priv);
752}
753