summaryrefslogtreecommitdiffstats
path: root/wifi/wifi.c
blob: 87be8d8594be941a80f95554384f93f52ab3b5a0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
/*
 * Copyright 2008, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/socket.h>
#include <unistd.h>
#include <poll.h>

#include "hardware_legacy/wifi.h"
#ifdef LIBWPA_CLIENT_EXISTS
#include "libwpa_client/wpa_ctrl.h"
#endif

#define LOG_TAG "WifiHW"
#include "cutils/log.h"
#include "cutils/memory.h"
#include "cutils/misc.h"
#include "cutils/properties.h"
#include "private/android_filesystem_config.h"
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#endif

extern int do_dhcp();
extern int ifc_init();
extern void ifc_close();
extern char *dhcp_lasterror();
extern void get_dhcp_info();
extern int init_module(void *, unsigned long, const char *);
extern int delete_module(const char *, unsigned int);
void wifi_close_sockets();

#ifndef LIBWPA_CLIENT_EXISTS
#define WPA_EVENT_TERMINATING "CTRL-EVENT-TERMINATING "
struct wpa_ctrl {};
void wpa_ctrl_cleanup(void) {}
struct wpa_ctrl *wpa_ctrl_open(const char *ctrl_path) { return NULL; }
void wpa_ctrl_close(struct wpa_ctrl *ctrl) {}
int wpa_ctrl_request(struct wpa_ctrl *ctrl, const char *cmd, size_t cmd_len,
	char *reply, size_t *reply_len, void (*msg_cb)(char *msg, size_t len))
	{ return 0; }
int wpa_ctrl_attach(struct wpa_ctrl *ctrl) { return 0; }
int wpa_ctrl_detach(struct wpa_ctrl *ctrl) { return 0; }
int wpa_ctrl_recv(struct wpa_ctrl *ctrl, char *reply, size_t *reply_len)
	{ return 0; }
int wpa_ctrl_get_fd(struct wpa_ctrl *ctrl) { return 0; }
#endif

static struct wpa_ctrl *ctrl_conn;
static struct wpa_ctrl *monitor_conn;

/* socket pair used to exit from a blocking read */
static int exit_sockets[2];

static char primary_iface[PROPERTY_VALUE_MAX];
// TODO: use new ANDROID_SOCKET mechanism, once support for multiple
// sockets is in

#ifndef WIFI_DRIVER_MODULE_ARG
#define WIFI_DRIVER_MODULE_ARG          ""
#endif
#ifndef WIFI_FIRMWARE_LOADER
#define WIFI_FIRMWARE_LOADER		""
#endif
#define WIFI_TEST_INTERFACE		"sta"

#ifndef WIFI_DRIVER_FW_PATH_STA
#define WIFI_DRIVER_FW_PATH_STA		NULL
#endif
#ifndef WIFI_DRIVER_FW_PATH_AP
#define WIFI_DRIVER_FW_PATH_AP		NULL
#endif
#ifndef WIFI_DRIVER_FW_PATH_P2P
#define WIFI_DRIVER_FW_PATH_P2P		NULL
#endif

#ifndef WIFI_DRIVER_FW_PATH_PARAM
#define WIFI_DRIVER_FW_PATH_PARAM	"/sys/module/wlan/parameters/fwpath"
#endif

#define WIFI_DRIVER_LOADER_DELAY	1000000

static const char IFACE_DIR[]           = "/data/system/wpa_supplicant";
#ifdef WIFI_DRIVER_MODULE_PATH
static const char DRIVER_MODULE_NAME[]  = WIFI_DRIVER_MODULE_NAME;
static const char DRIVER_MODULE_TAG[]   = WIFI_DRIVER_MODULE_NAME " ";
static const char DRIVER_MODULE_PATH[]  = WIFI_DRIVER_MODULE_PATH;
static const char DRIVER_MODULE_ARG[]   = WIFI_DRIVER_MODULE_ARG;
#endif
static const char FIRMWARE_LOADER[]     = WIFI_FIRMWARE_LOADER;
static const char DRIVER_PROP_NAME[]    = "wlan.driver.status";
static const char SUPPLICANT_NAME[]     = "wpa_supplicant";
static const char SUPP_PROP_NAME[]      = "init.svc.wpa_supplicant";
static const char P2P_SUPPLICANT_NAME[] = "p2p_supplicant";
static const char P2P_PROP_NAME[]       = "init.svc.p2p_supplicant";
static const char SUPP_CONFIG_TEMPLATE[]= "/system/etc/wifi/wpa_supplicant.conf";
static const char SUPP_CONFIG_FILE[]    = "/data/misc/wifi/wpa_supplicant.conf";
static const char P2P_CONFIG_FILE[]     = "/data/misc/wifi/p2p_supplicant.conf";
static const char CONTROL_IFACE_PATH[]  = "/data/misc/wifi/sockets";
static const char MODULE_FILE[]         = "/proc/modules";

static const char IFNAME[]              = "IFNAME=";
#define IFNAMELEN			(sizeof(IFNAME) - 1)
static const char WPA_EVENT_IGNORE[]    = "CTRL-EVENT-IGNORE ";

static const char SUPP_ENTROPY_FILE[]   = WIFI_ENTROPY_FILE;
static unsigned char dummy_key[21] = { 0x02, 0x11, 0xbe, 0x33, 0x43, 0x35,
                                       0x68, 0x47, 0x84, 0x99, 0xa9, 0x2b,
                                       0x1c, 0xd3, 0xee, 0xff, 0xf1, 0xe2,
                                       0xf3, 0xf4, 0xf5 };

/* Is either SUPPLICANT_NAME or P2P_SUPPLICANT_NAME */
static char supplicant_name[PROPERTY_VALUE_MAX];
/* Is either SUPP_PROP_NAME or P2P_PROP_NAME */
static char supplicant_prop_name[PROPERTY_KEY_MAX];

static int insmod(const char *filename, const char *args)
{
    void *module;
    unsigned int size;
    int ret;

    module = load_file(filename, &size);
    if (!module)
        return -1;

    ret = init_module(module, size, args);

    free(module);

    return ret;
}

static int rmmod(const char *modname)
{
    int ret = -1;
    int maxtry = 10;

    while (maxtry-- > 0) {
        ret = delete_module(modname, O_NONBLOCK | O_EXCL);
        if (ret < 0 && errno == EAGAIN)
            usleep(500000);
        else
            break;
    }

    if (ret != 0)
        ALOGD("Unable to unload driver module \"%s\": %s\n",
             modname, strerror(errno));
    return ret;
}

int do_dhcp_request(int *ipaddr, int *gateway, int *mask,
                    int *dns1, int *dns2, int *server, int *lease) {
    /* For test driver, always report success */
    if (strcmp(primary_iface, WIFI_TEST_INTERFACE) == 0)
        return 0;

    if (ifc_init() < 0)
        return -1;

    if (do_dhcp(primary_iface) < 0) {
        ifc_close();
        return -1;
    }
    ifc_close();
    get_dhcp_info(ipaddr, gateway, mask, dns1, dns2, server, lease);
    return 0;
}

const char *get_dhcp_error_string() {
    return dhcp_lasterror();
}

int is_wifi_driver_loaded() {
    char driver_status[PROPERTY_VALUE_MAX];
#ifdef WIFI_DRIVER_MODULE_PATH
    FILE *proc;
    char line[sizeof(DRIVER_MODULE_TAG)+10];
#endif

    if (!property_get(DRIVER_PROP_NAME, driver_status, NULL)
            || strcmp(driver_status, "ok") != 0) {
        return 0;  /* driver not loaded */
    }
#ifdef WIFI_DRIVER_MODULE_PATH
    /*
     * If the property says the driver is loaded, check to
     * make sure that the property setting isn't just left
     * over from a previous manual shutdown or a runtime
     * crash.
     */
    if ((proc = fopen(MODULE_FILE, "r")) == NULL) {
        ALOGW("Could not open %s: %s", MODULE_FILE, strerror(errno));
        property_set(DRIVER_PROP_NAME, "unloaded");
        return 0;
    }
    while ((fgets(line, sizeof(line), proc)) != NULL) {
        if (strncmp(line, DRIVER_MODULE_TAG, strlen(DRIVER_MODULE_TAG)) == 0) {
            fclose(proc);
            return 1;
        }
    }
    fclose(proc);
    property_set(DRIVER_PROP_NAME, "unloaded");
    return 0;
#else
    return 1;
#endif
}

int wifi_load_driver()
{
#ifdef WIFI_DRIVER_MODULE_PATH
    char driver_status[PROPERTY_VALUE_MAX];
    int count = 100; /* wait at most 20 seconds for completion */

    if (is_wifi_driver_loaded()) {
        return 0;
    }

    if (insmod(DRIVER_MODULE_PATH, DRIVER_MODULE_ARG) < 0)
        return -1;

    if (strcmp(FIRMWARE_LOADER,"") == 0) {
        /* usleep(WIFI_DRIVER_LOADER_DELAY); */
        property_set(DRIVER_PROP_NAME, "ok");
    }
    else {
        property_set("ctl.start", FIRMWARE_LOADER);
    }
    sched_yield();
    while (count-- > 0) {
        if (property_get(DRIVER_PROP_NAME, driver_status, NULL)) {
            if (strcmp(driver_status, "ok") == 0)
                return 0;
            else if (strcmp(DRIVER_PROP_NAME, "failed") == 0) {
                wifi_unload_driver();
                return -1;
            }
        }
        usleep(200000);
    }
    property_set(DRIVER_PROP_NAME, "timeout");
    wifi_unload_driver();
    return -1;
#else
    property_set(DRIVER_PROP_NAME, "ok");
    return 0;
#endif
}

int wifi_unload_driver()
{
    usleep(200000); /* allow to finish interface down */
#ifdef WIFI_DRIVER_MODULE_PATH
    if (rmmod(DRIVER_MODULE_NAME) == 0) {
        int count = 20; /* wait at most 10 seconds for completion */
        while (count-- > 0) {
            if (!is_wifi_driver_loaded())
                break;
            usleep(500000);
        }
        usleep(500000); /* allow card removal */
        if (count) {
            return 0;
        }
        return -1;
    } else
        return -1;
#else
    property_set(DRIVER_PROP_NAME, "unloaded");
    return 0;
#endif
}

int ensure_entropy_file_exists()
{
    int ret;
    int destfd;

    ret = access(SUPP_ENTROPY_FILE, R_OK|W_OK);
    if ((ret == 0) || (errno == EACCES)) {
        if ((ret != 0) &&
            (chmod(SUPP_ENTROPY_FILE, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) {
            ALOGE("Cannot set RW to \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
            return -1;
        }
        return 0;
    }
    destfd = TEMP_FAILURE_RETRY(open(SUPP_ENTROPY_FILE, O_CREAT|O_RDWR, 0660));
    if (destfd < 0) {
        ALOGE("Cannot create \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
        return -1;
    }

    if (TEMP_FAILURE_RETRY(write(destfd, dummy_key, sizeof(dummy_key))) != sizeof(dummy_key)) {
        ALOGE("Error writing \"%s\": %s", SUPP_ENTROPY_FILE, strerror(errno));
        close(destfd);
        return -1;
    }
    close(destfd);

    /* chmod is needed because open() didn't set permisions properly */
    if (chmod(SUPP_ENTROPY_FILE, 0660) < 0) {
        ALOGE("Error changing permissions of %s to 0660: %s",
             SUPP_ENTROPY_FILE, strerror(errno));
        unlink(SUPP_ENTROPY_FILE);
        return -1;
    }

    if (chown(SUPP_ENTROPY_FILE, AID_SYSTEM, AID_WIFI) < 0) {
        ALOGE("Error changing group ownership of %s to %d: %s",
             SUPP_ENTROPY_FILE, AID_WIFI, strerror(errno));
        unlink(SUPP_ENTROPY_FILE);
        return -1;
    }
    return 0;
}

int ensure_config_file_exists(const char *config_file)
{
    char buf[2048];
    int srcfd, destfd;
    struct stat sb;
    int nread;
    int ret;

    ret = access(config_file, R_OK|W_OK);
    if ((ret == 0) || (errno == EACCES)) {
        if ((ret != 0) &&
            (chmod(config_file, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) != 0)) {
            ALOGE("Cannot set RW to \"%s\": %s", config_file, strerror(errno));
            return -1;
        }
        return 0;
    } else if (errno != ENOENT) {
        ALOGE("Cannot access \"%s\": %s", config_file, strerror(errno));
        return -1;
    }

    srcfd = TEMP_FAILURE_RETRY(open(SUPP_CONFIG_TEMPLATE, O_RDONLY));
    if (srcfd < 0) {
        ALOGE("Cannot open \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
        return -1;
    }

    destfd = TEMP_FAILURE_RETRY(open(config_file, O_CREAT|O_RDWR, 0660));
    if (destfd < 0) {
        close(srcfd);
        ALOGE("Cannot create \"%s\": %s", config_file, strerror(errno));
        return -1;
    }

    while ((nread = TEMP_FAILURE_RETRY(read(srcfd, buf, sizeof(buf)))) != 0) {
        if (nread < 0) {
            ALOGE("Error reading \"%s\": %s", SUPP_CONFIG_TEMPLATE, strerror(errno));
            close(srcfd);
            close(destfd);
            unlink(config_file);
            return -1;
        }
        TEMP_FAILURE_RETRY(write(destfd, buf, nread));
    }

    close(destfd);
    close(srcfd);

    /* chmod is needed because open() didn't set permisions properly */
    if (chmod(config_file, 0660) < 0) {
        ALOGE("Error changing permissions of %s to 0660: %s",
             config_file, strerror(errno));
        unlink(config_file);
        return -1;
    }

    if (chown(config_file, AID_SYSTEM, AID_WIFI) < 0) {
        ALOGE("Error changing group ownership of %s to %d: %s",
             config_file, AID_WIFI, strerror(errno));
        unlink(config_file);
        return -1;
    }
    return 0;
}

int wifi_start_supplicant(int p2p_supported)
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
    int count = 200; /* wait at most 20 seconds for completion */
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
    const prop_info *pi;
    unsigned serial = 0, i;
#endif

    if (p2p_supported) {
        strcpy(supplicant_name, P2P_SUPPLICANT_NAME);
        strcpy(supplicant_prop_name, P2P_PROP_NAME);

        /* Ensure p2p config file is created */
        if (ensure_config_file_exists(P2P_CONFIG_FILE) < 0) {
            ALOGE("Failed to create a p2p config file");
            return -1;
        }

    } else {
        strcpy(supplicant_name, SUPPLICANT_NAME);
        strcpy(supplicant_prop_name, SUPP_PROP_NAME);
    }

    /* Check whether already running */
    if (property_get(supplicant_prop_name, supp_status, NULL)
            && strcmp(supp_status, "running") == 0) {
        return 0;
    }

    /* Before starting the daemon, make sure its config file exists */
    if (ensure_config_file_exists(SUPP_CONFIG_FILE) < 0) {
        ALOGE("Wi-Fi will not be enabled");
        return -1;
    }

    if (ensure_entropy_file_exists() < 0) {
        ALOGE("Wi-Fi entropy file was not created");
    }

    /* Clear out any stale socket files that might be left over. */
    wpa_ctrl_cleanup();

    /* Reset sockets used for exiting from hung state */
    exit_sockets[0] = exit_sockets[1] = -1;

#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
    /*
     * Get a reference to the status property, so we can distinguish
     * the case where it goes stopped => running => stopped (i.e.,
     * it start up, but fails right away) from the case in which
     * it starts in the stopped state and never manages to start
     * running at all.
     */
    pi = __system_property_find(supplicant_prop_name);
    if (pi != NULL) {
        serial = __system_property_serial(pi);
    }
#endif
    property_get("wifi.interface", primary_iface, WIFI_TEST_INTERFACE);

    property_set("ctl.start", supplicant_name);
    sched_yield();

    while (count-- > 0) {
#ifdef HAVE_LIBC_SYSTEM_PROPERTIES
        if (pi == NULL) {
            pi = __system_property_find(supplicant_prop_name);
        }
        if (pi != NULL) {
            /*
             * property serial updated means that init process is scheduled
             * after we sched_yield, further property status checking is based on this */
            if (__system_property_serial(pi) != serial) {
                __system_property_read(pi, NULL, supp_status);
                if (strcmp(supp_status, "running") == 0) {
                    return 0;
                } else if (strcmp(supp_status, "stopped") == 0) {
                    return -1;
                }
            }
        }
#else
        if (property_get(supplicant_prop_name, supp_status, NULL)) {
            if (strcmp(supp_status, "running") == 0)
                return 0;
        }
#endif
        usleep(100000);
    }
    return -1;
}

int wifi_stop_supplicant(int p2p_supported)
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
    int count = 50; /* wait at most 5 seconds for completion */

    if (p2p_supported) {
        strcpy(supplicant_name, P2P_SUPPLICANT_NAME);
        strcpy(supplicant_prop_name, P2P_PROP_NAME);
    } else {
        strcpy(supplicant_name, SUPPLICANT_NAME);
        strcpy(supplicant_prop_name, SUPP_PROP_NAME);
    }

    /* Check whether supplicant already stopped */
    if (property_get(supplicant_prop_name, supp_status, NULL)
        && strcmp(supp_status, "stopped") == 0) {
        return 0;
    }

    property_set("ctl.stop", supplicant_name);
    sched_yield();

    while (count-- > 0) {
        if (property_get(supplicant_prop_name, supp_status, NULL)) {
            if (strcmp(supp_status, "stopped") == 0)
                return 0;
        }
        usleep(100000);
    }
    ALOGE("Failed to stop supplicant");
    return -1;
}

int wifi_connect_on_socket_path(const char *path)
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};

    /* Make sure supplicant is running */
    if (!property_get(supplicant_prop_name, supp_status, NULL)
            || strcmp(supp_status, "running") != 0) {
        ALOGE("Supplicant not running, cannot connect");
        return -1;
    }

    ctrl_conn = wpa_ctrl_open(path);
    if (ctrl_conn == NULL) {
        ALOGE("Unable to open connection to supplicant on \"%s\": %s",
             path, strerror(errno));
        return -1;
    }
    monitor_conn = wpa_ctrl_open(path);
    if (monitor_conn == NULL) {
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = NULL;
        return -1;
    }
    if (wpa_ctrl_attach(monitor_conn) != 0) {
        wpa_ctrl_close(monitor_conn);
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = monitor_conn = NULL;
        return -1;
    }

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, exit_sockets) == -1) {
        wpa_ctrl_close(monitor_conn);
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = monitor_conn = NULL;
        return -1;
    }

    return 0;
}

/* Establishes the control and monitor socket connections on the interface */
int wifi_connect_to_supplicant()
{
    static char path[PATH_MAX];

    if (access(IFACE_DIR, F_OK) == 0) {
        snprintf(path, sizeof(path), "%s/%s", IFACE_DIR, primary_iface);
    } else {
        snprintf(path, sizeof(path), "@android:wpa_%s", primary_iface);
    }
    return wifi_connect_on_socket_path(path);
}

int wifi_send_command(const char *cmd, char *reply, size_t *reply_len)
{
    int ret;
    if (ctrl_conn == NULL) {
        ALOGV("Not connected to wpa_supplicant - \"%s\" command dropped.\n", cmd);
        return -1;
    }
    ret = wpa_ctrl_request(ctrl_conn, cmd, strlen(cmd), reply, reply_len, NULL);
    if (ret == -2) {
        ALOGD("'%s' command timed out.\n", cmd);
        /* unblocks the monitor receive socket for termination */
        TEMP_FAILURE_RETRY(write(exit_sockets[0], "T", 1));
        return -2;
    } else if (ret < 0 || strncmp(reply, "FAIL", 4) == 0) {
        return -1;
    }
    if (strncmp(cmd, "PING", 4) == 0) {
        reply[*reply_len] = '\0';
    }
    return 0;
}

int wifi_supplicant_connection_active()
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};

    if (property_get(supplicant_prop_name, supp_status, NULL)) {
        if (strcmp(supp_status, "stopped") == 0)
            return -1;
    }

    return 0;
}

int wifi_ctrl_recv(char *reply, size_t *reply_len)
{
    int res;
    int ctrlfd = wpa_ctrl_get_fd(monitor_conn);
    struct pollfd rfds[2];

    memset(rfds, 0, 2 * sizeof(struct pollfd));
    rfds[0].fd = ctrlfd;
    rfds[0].events |= POLLIN;
    rfds[1].fd = exit_sockets[1];
    rfds[1].events |= POLLIN;
    do {
        res = TEMP_FAILURE_RETRY(poll(rfds, 2, 30000));
        if (res < 0) {
            ALOGE("Error poll = %d", res);
            return res;
        } else if (res == 0) {
            /* timed out, check if supplicant is active
             * or not ..
             */
            res = wifi_supplicant_connection_active();
            if (res < 0)
                return -2;
        }
    } while (res == 0);

    if (rfds[0].revents & POLLIN) {
        return wpa_ctrl_recv(monitor_conn, reply, reply_len);
    }

    /* it is not rfds[0], then it must be rfts[1] (i.e. the exit socket)
     * or we timed out. In either case, this call has failed ..
     */
    return -2;
}

int wifi_wait_on_socket(char *buf, size_t buflen)
{
    size_t nread = buflen - 1;
    int result;
    char *match, *match2;

    if (monitor_conn == NULL) {
        return snprintf(buf, buflen, "IFNAME=%s %s - connection closed",
                        primary_iface, WPA_EVENT_TERMINATING);
    }

    result = wifi_ctrl_recv(buf, &nread);

    /* Terminate reception on exit socket */
    if (result == -2) {
        return snprintf(buf, buflen, "IFNAME=%s %s - connection closed",
                        primary_iface, WPA_EVENT_TERMINATING);
    }

    if (result < 0) {
        ALOGD("wifi_ctrl_recv failed: %s\n", strerror(errno));
        return snprintf(buf, buflen, "IFNAME=%s %s - recv error",
                        primary_iface, WPA_EVENT_TERMINATING);
    }
    buf[nread] = '\0';
    /* Check for EOF on the socket */
    if (result == 0 && nread == 0) {
        /* Fabricate an event to pass up */
        ALOGD("Received EOF on supplicant socket\n");
        return snprintf(buf, buflen, "IFNAME=%s %s - signal 0 received",
                        primary_iface, WPA_EVENT_TERMINATING);
    }
    /*
     * Events strings are in the format
     *
     *     IFNAME=iface <N>CTRL-EVENT-XXX 
     *        or
     *     <N>CTRL-EVENT-XXX 
     *
     * where N is the message level in numerical form (0=VERBOSE, 1=DEBUG,
     * etc.) and XXX is the event name. The level information is not useful
     * to us, so strip it off.
     */

    if (strncmp(buf, IFNAME, IFNAMELEN) == 0) {
        match = strchr(buf, ' ');
        if (match != NULL) {
            if (match[1] == '<') {
                match2 = strchr(match + 2, '>');
                if (match2 != NULL) {
                    nread -= (match2 - match);
                    memmove(match + 1, match2 + 1, nread - (match - buf) + 1);
                }
            }
        } else {
            return snprintf(buf, buflen, "%s", WPA_EVENT_IGNORE);
        }
    } else if (buf[0] == '<') {
        match = strchr(buf, '>');
        if (match != NULL) {
            nread -= (match + 1 - buf);
            memmove(buf, match + 1, nread + 1);
            ALOGV("supplicant generated event without interface - %s\n", buf);
        }
    } else {
        /* let the event go as is! */
        ALOGW("supplicant generated event without interface and without message level - %s\n", buf);
    }

    return nread;
}

int wifi_wait_for_event(char *buf, size_t buflen)
{
    return wifi_wait_on_socket(buf, buflen);
}

void wifi_close_sockets()
{
    if (ctrl_conn != NULL) {
        wpa_ctrl_close(ctrl_conn);
        ctrl_conn = NULL;
    }

    if (monitor_conn != NULL) {
        wpa_ctrl_close(monitor_conn);
        monitor_conn = NULL;
    }

    if (exit_sockets[0] >= 0) {
        close(exit_sockets[0]);
        exit_sockets[0] = -1;
    }

    if (exit_sockets[1] >= 0) {
        close(exit_sockets[1]);
        exit_sockets[1] = -1;
    }
}

void wifi_close_supplicant_connection()
{
    char supp_status[PROPERTY_VALUE_MAX] = {'\0'};
    int count = 50; /* wait at most 5 seconds to ensure init has stopped stupplicant */

    wifi_close_sockets();

    while (count-- > 0) {
        if (property_get(supplicant_prop_name, supp_status, NULL)) {
            if (strcmp(supp_status, "stopped") == 0)
                return;
        }
        usleep(100000);
    }
}

int wifi_command(const char *command, char *reply, size_t *reply_len)
{
    return wifi_send_command(command, reply, reply_len);
}

const char *wifi_get_fw_path(int fw_type)
{
    switch (fw_type) {
    case WIFI_GET_FW_PATH_STA:
        return WIFI_DRIVER_FW_PATH_STA;
    case WIFI_GET_FW_PATH_AP:
        return WIFI_DRIVER_FW_PATH_AP;
    case WIFI_GET_FW_PATH_P2P:
        return WIFI_DRIVER_FW_PATH_P2P;
    }
    return NULL;
}

int wifi_change_fw_path(const char *fwpath)
{
    int len;
    int fd;
    int ret = 0;

    if (!fwpath)
        return ret;
    fd = TEMP_FAILURE_RETRY(open(WIFI_DRIVER_FW_PATH_PARAM, O_WRONLY));
    if (fd < 0) {
        ALOGE("Failed to open wlan fw path param (%s)", strerror(errno));
        return -1;
    }
    len = strlen(fwpath) + 1;
    if (TEMP_FAILURE_RETRY(write(fd, fwpath, len)) != len) {
        ALOGE("Failed to write wlan fw path param (%s)", strerror(errno));
        ret = -1;
    }
    close(fd);
    return ret;
}