Use a merge sort from Simon Tatham to sort wireless scans into
[dhcpcd-ui] / src / libdhcpcd / wpa.c
1 /*
2  * libdhcpcd
3  * Copyright 2009-2014 Roy Marples <roy@marples.name>
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26
27 #include <sys/socket.h>
28 #include <sys/stat.h>
29 #include <sys/un.h>
30
31 #include <assert.h>
32 #include <ctype.h>
33 #include <errno.h>
34 #include <limits.h>
35 #include <poll.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <unistd.h>
40
41 #define IN_LIBDHCPCD
42 #include "config.h"
43 #include "dhcpcd.h"
44
45 #ifndef SUN_LEN
46 #define SUN_LEN(su) \
47         (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
48 #endif
49
50 #define CLAMP(x, low, high) \
51         (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
52
53 static int
54 wpa_open(const char *ifname, char **path)
55 {
56         static int counter;
57         int fd;
58         socklen_t len;
59         struct sockaddr_un sun;
60
61         if ((fd = socket(AF_UNIX,
62             SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0)) == -1)
63                 return -1;
64         memset(&sun, 0, sizeof(sun));
65         sun.sun_family = AF_UNIX;
66         snprintf(sun.sun_path, sizeof(sun.sun_path),
67             "/tmp/libdhcpcd-wpa-%d.%d", getpid(), counter++);
68         *path = strdup(sun.sun_path);
69         len = (socklen_t)SUN_LEN(&sun);
70         if (bind(fd, (struct sockaddr *)&sun, len) == -1) {
71                 close(fd);
72                 unlink(*path);
73                 free(*path);
74                 *path = NULL;
75                 return -1;
76         }
77         snprintf(sun.sun_path, sizeof(sun.sun_path),
78             WPA_CTRL_DIR "/%s", ifname);
79         len = (socklen_t)SUN_LEN(&sun);
80         if (connect(fd, (struct sockaddr *)&sun, len) == -1) {
81                 close(fd);
82                 unlink(*path);
83                 free(*path);
84                 *path = NULL;
85                 return -1;
86         }
87
88         return fd;
89 }
90
91 static ssize_t
92 wpa_cmd(int fd, const char *cmd, char *buffer, size_t len)
93 {
94         int retval;
95         ssize_t bytes;
96         struct pollfd pfd;
97
98         if (buffer)
99                 *buffer = '\0';
100         bytes = write(fd, cmd, strlen(cmd));
101         if (bytes == -1 || bytes == 0)
102                 return -1;
103         if (buffer == NULL || len == 0)
104                 return 0;
105         pfd.fd = fd;
106         pfd.events = POLLIN | POLLHUP;
107         pfd.revents = 0;
108         retval = poll(&pfd, 1, 2000);
109         if (retval == -1)
110                 return -1;
111         if (retval == 0 || !(pfd.revents & (POLLIN | POLLHUP)))
112                 return -1;
113
114         bytes = read(fd, buffer, len == 1 ? 1 : len - 1);
115         if (bytes != -1)
116                 buffer[bytes] = '\0';
117         return bytes;
118 }
119
120 bool
121 dhcpcd_wpa_command(DHCPCD_WPA *wpa, const char *cmd)
122 {
123         char buf[10];
124         ssize_t bytes;
125
126         bytes = wpa_cmd(wpa->command_fd, cmd, buf, sizeof(buf));
127         return (bytes == -1 || bytes == 0 ||
128             strcmp(buf, "OK\n")) ? false : true;
129 }
130
131 bool
132 dhcpcd_wpa_command_arg(DHCPCD_WPA *wpa, const char *cmd, const char *arg)
133 {
134         size_t cmdlen, nlen;
135
136         cmdlen = strlen(cmd);
137         nlen = cmdlen + strlen(arg) + 2;
138         if (!dhcpcd_realloc(wpa->con, nlen))
139                 return -1;
140         strlcpy(wpa->con->buf, cmd, wpa->con->buflen);
141         wpa->con->buf[cmdlen] = ' ';
142         strlcpy(wpa->con->buf + cmdlen + 1, arg, wpa->con->buflen - 1 - cmdlen);
143         return dhcpcd_wpa_command(wpa, wpa->con->buf);
144 }
145
146 static bool
147 dhcpcd_attach_detach(DHCPCD_WPA *wpa, bool attach)
148 {
149         char buf[10];
150         ssize_t bytes;
151
152         if (wpa->attached == attach)
153                 return true;
154
155         bytes = wpa_cmd(wpa->listen_fd, attach > 0 ? "ATTACH" : "DETACH",
156             buf, sizeof(buf));
157         if (bytes == -1 || bytes == 0 || strcmp(buf, "OK\n"))
158                 return false;
159
160         wpa->attached = attach;
161         return true;
162 }
163
164 bool
165 dhcpcd_wpa_scan(DHCPCD_WPA *wpa)
166 {
167
168         return dhcpcd_wpa_command(wpa, "SCAN");
169 }
170
171 void
172 dhcpcd_wi_scans_free(DHCPCD_WI_SCAN *wis)
173 {
174         DHCPCD_WI_SCAN *n;
175
176         while (wis) {
177                 n = wis->next;
178                 free(wis);
179                 wis = n;
180         }
181 }
182
183 static void
184 dhcpcd_strtoi(int *val, const char *s)
185 {
186         long l;
187
188         l = strtol(s, NULL, 0);
189         if (l >= INT_MIN && l <= INT_MAX)
190                 *val = (int)l;
191         else
192                 errno = ERANGE;
193 }
194
195 static int
196 dhcpcd_wpa_hex2num(char c)
197 {
198
199         if (c >= '0' && c <= '9')
200                 return c - '0';
201         if (c >= 'a' && c <= 'f')
202                 return c - 'a' + 10;
203         if (c >= 'A' && c <= 'F')
204                 return c - 'A' + 10;
205         return -1;
206 }
207
208 static int
209 dhcpcd_wpa_hex2byte(const char *src)
210 {
211         int h, l;
212
213         if ((h = dhcpcd_wpa_hex2num(*src++)) == -1 ||
214             (l = dhcpcd_wpa_hex2num(*src)) == -1)
215                 return -1;
216         return (h << 4) | l;
217 }
218
219 static ssize_t
220 dhcpcd_wpa_decode_ssid(char *dst, size_t dlen, const char *src)
221 {
222         const char *start;
223         char c, esc;
224         int xb;
225
226         start = dst;
227         for (;;) {
228                 if (*src == '\0')
229                         break;
230                 if (--dlen == 0) {
231                         errno = ENOSPC;
232                         return -1;
233                 }
234                 c = *src++;
235                 switch (c) {
236                 case '\\':
237                         if (*src == '\0') {
238                                 errno = EINVAL;
239                                 return -1;
240                         }
241                         esc = *src++;
242                         switch (esc) {
243                         case '\\':
244                         case '"': *dst++ = esc; break;
245                         case 'n': *dst++ = '\n'; break;
246                         case 'r': *dst++ = '\r'; break;
247                         case 't': *dst++ = '\t'; break;
248                         case 'e': *dst++ = '\033'; break;
249                         case 'x':
250                                 if (src[0] == '\0' || src[1] == '\0') {
251                                         errno = EINVAL;
252                                         return -1;
253                                 }
254                                 if ((xb = dhcpcd_wpa_hex2byte(src)) == -1)
255                                         return -1;
256                                 *dst++ = (char)xb;
257                                 src += 2;
258                                 break;
259                         default: errno = EINVAL; return -1;
260                         }
261                 default: *dst++ = c; break;
262                 }
263         }
264         if (dlen == 0) {
265                 errno = ENOSPC;
266                 return -1;
267         }
268         *dst = '\0';
269         return dst - start;
270 }
271
272 static DHCPCD_WI_SCAN *
273 dhcpcd_wpa_scans_read(DHCPCD_WPA *wpa)
274 {
275         size_t i;
276         ssize_t bytes, dl;
277         DHCPCD_WI_SCAN *wis, *w, *l;
278         char *s, *p, buf[32];
279         char wssid[sizeof(w->ssid)];
280
281         if (!dhcpcd_realloc(wpa->con, 2048))
282                 return NULL;
283         wis = NULL;
284         for (i = 0; i < 1000; i++) {
285                 snprintf(buf, sizeof(buf), "BSS %zu", i);
286                 bytes = wpa_cmd(wpa->command_fd, buf,
287                     wpa->con->buf, wpa->con->buflen);
288                 if (bytes == 0 || bytes == -1 ||
289                     strncmp(wpa->con->buf, "FAIL", 4) == 0)
290                         break;
291                 p = wpa->con->buf;
292                 w = calloc(1, sizeof(*w));
293                 if (w == NULL)
294                         break;
295                 dl = 0;
296                 wssid[0] = '\0';
297                 while ((s = strsep(&p, "\n"))) {
298                         if (*s == '\0')
299                                 continue;
300                         if (strncmp(s, "bssid=", 6) == 0)
301                                 strlcpy(w->bssid, s + 6, sizeof(w->bssid));
302                         else if (strncmp(s, "freq=", 5) == 0)
303                                 dhcpcd_strtoi(&w->frequency, s + 5);
304 //                      else if (strncmp(s, "beacon_int=", 11) == 0)
305 //                              ;
306                         else if (strncmp(s, "qual=", 5) == 0)
307                                 dhcpcd_strtoi(&w->quality.value, s + 5);
308                         else if (strncmp(s, "noise=", 6) == 0)
309                                 dhcpcd_strtoi(&w->noise.value, s + 6);
310                         else if (strncmp(s, "level=", 6) == 0)
311                                 dhcpcd_strtoi(&w->level.value, s + 6);
312                         else if (strncmp(s, "flags=", 6) == 0)
313                                 strlcpy(w->flags, s + 6, sizeof(w->flags));
314                         else if (strncmp(s, "ssid=", 5) == 0) {
315                                 /* Decode it from \xNN to \NNN
316                                  * so we're consistent */
317                                 dl = dhcpcd_wpa_decode_ssid(wssid,
318                                     sizeof(wssid), s + 5);
319                                 if (dl == -1)
320                                         break;
321                                 dl = dhcpcd_encode_string_escape(w->ssid,
322                                     sizeof(w->ssid), wssid, (size_t)dl);
323                                 if (dl == -1)
324                                         break;
325                         }
326                 }
327                 if (dl == -1) {
328                         free(w);
329                         break;
330                 }
331
332                 if (wis == NULL)
333                         wis = w;
334                 else
335                         l->next = w;
336                 l = w;
337
338                 w->strength.value = w->level.value;
339                 if (w->strength.value > 110 && w->strength.value < 256)
340                         /* Convert WEXT level to dBm */
341                         w->strength.value -= 256;
342
343                 if (w->strength.value < 0) {
344                         /* Assume dBm */
345                         w->strength.value =
346                             abs(CLAMP(w->strength.value, -100, -40) + 40);
347                         w->strength.value =
348                             100 - ((100 * w->strength.value) / 60);
349                 } else {
350                         /* Assume quality percentage */
351                         w->strength.value = CLAMP(w->strength.value, 0, 100);
352                 }
353         }
354         return wis;
355 }
356
357 /*
358  * This function is copyright 2001 Simon Tatham.
359  *
360  * Permission is hereby granted, free of charge, to any person
361  * obtaining a copy of this software and associated documentation
362  * files (the "Software"), to deal in the Software without
363  * restriction, including without limitation the rights to use,
364  * copy, modify, merge, publish, distribute, sublicense, and/or
365  * sell copies of the Software, and to permit persons to whom the
366  * Software is furnished to do so, subject to the following
367  * conditions:
368  *
369  * The above copyright notice and this permission notice shall be
370  * included in all copies or substantial portions of the Software.
371  *
372  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
373  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
374  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
375  * NONINFRINGEMENT.  IN NO EVENT SHALL SIMON TATHAM BE LIABLE FOR
376  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
377  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
378  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
379  * SOFTWARE.
380  */
381 static DHCPCD_WI_SCAN *
382 dhcpcd_wi_scan_sort(DHCPCD_WI_SCAN *list)
383 {
384         DHCPCD_WI_SCAN *p, *q, *e, *tail;
385         size_t insize, nmerges, psize, qsize, i;
386
387         /* Silly special case: if `list' was passed in as NULL, return
388          * NULL immediately. */
389         if (!list)
390                 return NULL;
391
392         insize = 1;
393
394         for (;;) {
395                 p = list;
396                 list = tail = NULL;
397                 nmerges = 0;  /* count number of merges we do in this pass */
398
399                 while (p) {
400                         nmerges++;  /* there exists a merge to be done */
401                         /* step `insize' places along from p */
402                         q = p;
403                         psize = 0;
404                         for (i = 0; i < insize; i++) {
405                                 psize++;
406                                 q = q->next;
407                                 if (!q)
408                                         break;
409                         }
410
411                         /* if q hasn't fallen off end,
412                          * we have two lists to merge */
413                         qsize = insize;
414
415                         /* now we have two lists; merge them */
416                         while (psize > 0 || (qsize > 0 && q)) {
417                                 /* decide whether next element of merge comes
418                                  * from p or q */
419                                 if (psize == 0) {
420                                         /* p is empty; e must come from q. */
421                                         e = q; q = q->next; qsize--;
422                                 } else if (qsize == 0 || !q) {
423                                         /* q is empty; e must come from p. */
424                                         e = p; p = p->next; psize--;
425                                 } else if (strcasecmp(p->ssid,q->ssid) <= 0) {
426                                         /* First element of p is lower
427                                          * (or same); e must come from p. */
428                                         e = p; p = p->next; psize--;
429                                 } else {
430                                         /* First element of q is lower;
431                                          * e must come from q. */
432                                         e = q; q = q->next; qsize--;
433                                 }
434
435                                 /* add the next element to the merged list */
436                                 if (tail)
437                                         tail->next = e;
438                                 else
439                                         list = e;
440                                 tail = e;
441                         }
442
443                         /* now p has stepped `insize' places along,
444                          * and q has too */
445                         p = q;
446                 }
447                 tail->next = NULL;
448
449                 /* If we have done only one merge, we're finished. */
450                 if (nmerges <= 1)   /* allow for nmerges==0, the empty list */
451                         return list;
452
453                 /* Otherwise repeat, merging lists twice the size */
454                 insize *= 2;
455         }
456 }
457
458 DHCPCD_WI_SCAN *
459 dhcpcd_wi_scans(DHCPCD_IF *i)
460 {
461         DHCPCD_WPA *wpa;
462         DHCPCD_WI_SCAN *wis, *w;
463         int nh;
464         DHCPCD_WI_HIST *h, *hl;
465
466         wpa = dhcpcd_wpa_find(i->con, i->ifname);
467         if (wpa == NULL)
468                 return NULL;
469         wis = dhcpcd_wpa_scans_read(wpa);
470
471         /* Sort the resultant list alphabetically */
472         wis = dhcpcd_wi_scan_sort(wis);
473
474         for (w = wis; w; w = w->next) {
475                 nh = 1;
476                 hl = NULL;
477                 w->quality.average = w->quality.value;
478                 w->noise.average = w->noise.value;
479                 w->level.average = w->level.value;
480                 w->strength.average = w->strength.value;
481
482                 for (h = wpa->con->wi_history; h; h = h->next) {
483                         if (strcmp(h->ifname, i->ifname) == 0 &&
484                             strcmp(h->bssid, wis->bssid) == 0)
485                         {
486                                 w->quality.average += h->quality;
487                                 w->noise.average += h->noise;
488                                 w->level.average += h->level;
489                                 w->strength.average += h->strength;
490                                 if (++nh == DHCPCD_WI_HIST_MAX) {
491                                         hl->next = h->next;
492                                         free(h);
493                                         break;
494                                 }
495                         }
496                         hl = h;
497                 }
498
499                 if (nh != 1) {
500                         w->quality.average /= nh;
501                         w->noise.average /= nh;
502                         w->level.average /= nh;
503                         w->strength.average /= nh;
504                 }
505                 h = malloc(sizeof(*h));
506                 if (h) {
507                         strlcpy(h->ifname, i->ifname, sizeof(h->ifname));
508                         strlcpy(h->bssid, w->bssid, sizeof(h->bssid));
509                         h->quality = w->quality.value;
510                         h->noise = w->noise.value;
511                         h->level = w->level.value;
512                         h->strength = w->strength.value;
513                         h->next = wpa->con->wi_history;
514                         wpa->con->wi_history = h;
515                 }
516         }
517
518         return wis;
519 }
520
521 bool
522 dhcpcd_wpa_reassociate(DHCPCD_WPA *wpa)
523 {
524
525         return dhcpcd_wpa_command(wpa, "REASSOCIATE");
526 }
527
528 bool
529 dhcpcd_wpa_disconnect(DHCPCD_WPA *wpa)
530 {
531
532         return dhcpcd_wpa_command(wpa, "DISCONNECT");
533 }
534
535 bool
536 dhcpcd_wpa_config_write(DHCPCD_WPA *wpa)
537 {
538
539         return dhcpcd_wpa_command(wpa, "SAVE_CONFIG");
540 }
541
542 static bool
543 dhcpcd_wpa_network(DHCPCD_WPA *wpa, const char *cmd, int id)
544 {
545         size_t len;
546
547         len = strlen(cmd) + 32;
548         if (!dhcpcd_realloc(wpa->con, len))
549                 return false;
550         snprintf(wpa->con->buf, wpa->con->buflen, "%s %d", cmd, id);
551         return dhcpcd_wpa_command(wpa, wpa->con->buf);
552 }
553
554 bool
555 dhcpcd_wpa_network_disable(DHCPCD_WPA *wpa, int id)
556 {
557
558         return dhcpcd_wpa_network(wpa, "DISABLE_NETWORK", id);
559 }
560
561 bool
562 dhcpcd_wpa_network_enable(DHCPCD_WPA *wpa, int id)
563 {
564
565         return dhcpcd_wpa_network(wpa, "ENABLE_NETWORK", id);
566 }
567
568 bool
569 dhcpcd_wpa_network_remove(DHCPCD_WPA *wpa, int id)
570 {
571
572         return dhcpcd_wpa_network(wpa, "REMOVE_NETWORK", id);
573 }
574
575 char *
576 dhcpcd_wpa_network_get(DHCPCD_WPA *wpa, int id, const char *param)
577 {
578         ssize_t bytes;
579
580         if (!dhcpcd_realloc(wpa->con, 2048))
581                 return NULL;
582         snprintf(wpa->con->buf, wpa->con->buflen, "GET_NETWORK %d %s",
583             id, param);
584         bytes = wpa_cmd(wpa->command_fd, wpa->con->buf,
585             wpa->con->buf, wpa->con->buflen);
586         if (bytes == 0 || bytes == -1)
587                 return NULL;
588         if (strcmp(wpa->con->buf, "FAIL\n") == 0) {
589                 errno = EINVAL;
590                 return NULL;
591         }
592         return wpa->con->buf;
593 }
594
595 bool
596 dhcpcd_wpa_network_set(DHCPCD_WPA *wpa, int id,
597     const char *param, const char *value)
598 {
599         size_t len;
600
601         len = strlen("SET_NETWORK") + 32 + strlen(param) + strlen(value) + 3;
602         if (!dhcpcd_realloc(wpa->con, len))
603                 return false;
604         snprintf(wpa->con->buf, wpa->con->buflen, "SET_NETWORK %d %s %s",
605             id, param, value);
606         return dhcpcd_wpa_command(wpa, wpa->con->buf);
607 }
608
609 static int
610 dhcpcd_wpa_network_find(DHCPCD_WPA *wpa, const char *fssid)
611 {
612         ssize_t bytes, dl, tl;
613         size_t fl;
614         char *s, *t, *ssid, *bssid, *flags;
615         char dssid[IF_SSIDSIZE], tssid[IF_SSIDSIZE];
616         long l;
617
618         dhcpcd_realloc(wpa->con, 2048);
619         bytes = wpa_cmd(wpa->command_fd, "LIST_NETWORKS",
620             wpa->con->buf, wpa->con->buflen);
621         if (bytes == 0 || bytes == -1)
622                 return -1;
623
624         fl = strlen(fssid);
625
626         s = strchr(wpa->con->buf, '\n');
627         if (s == NULL)
628                 return -1;
629         while ((t = strsep(&s, "\b"))) {
630                 if (*t == '\0')
631                         continue;
632                 ssid = strchr(t, '\t');
633                 if (ssid == NULL)
634                         break;
635                 *ssid++ = '\0';
636                 bssid = strchr(ssid, '\t');
637                 if (bssid == NULL)
638                         break;
639                 *bssid++ = '\0';
640                 flags = strchr(bssid, '\t');
641                 if (flags == NULL)
642                         break;
643                 *flags++ = '\0';
644                 l = strtol(t, NULL, 0);
645                 if (l < 0 || l > INT_MAX) {
646                         errno = ERANGE;
647                         break;
648                 }
649
650                 /* Decode the wpa_supplicant SSID into raw chars and
651                  * then encode into our octal escaped string to
652                  * compare. */
653                 dl = dhcpcd_wpa_decode_ssid(dssid, sizeof(dssid), ssid);
654                 if (dl == -1)
655                         return -1;
656                 tl = dhcpcd_encode_string_escape(tssid,
657                     sizeof(tssid), dssid, (size_t)dl);
658                 if (tl == -1)
659                         return -1;
660                 if ((size_t)tl == fl && memcmp(tssid, fssid, (size_t)tl) == 0)
661                         return (int)l;
662         }
663         errno = ENOENT;
664         return -1;
665 }
666
667 static int
668 dhcpcd_wpa_network_new(DHCPCD_WPA *wpa)
669 {
670         ssize_t bytes;
671         long l;
672
673         dhcpcd_realloc(wpa->con, 32);
674         bytes = wpa_cmd(wpa->command_fd, "ADD_NETWORK",
675             wpa->con->buf, sizeof(wpa->con->buf));
676         if (bytes == 0 || bytes == -1)
677                 return -1;
678         l = strtol(wpa->con->buf, NULL, 0);
679         if (l < 0 || l > INT_MAX) {
680                 errno = ERANGE;
681                 return -1;
682         }
683         return (int)l;
684 }
685
686 static const char hexchrs[] = "0123456789abcdef";
687 int
688 dhcpcd_wpa_network_find_new(DHCPCD_WPA *wpa, const char *ssid)
689 {
690         int id;
691         char dssid[IF_SSIDSIZE], essid[IF_SSIDSIZE], *ep;
692         ssize_t dl, i;
693         char *dp;
694
695         id = dhcpcd_wpa_network_find(wpa, ssid);
696         if (id != -1)
697                 return id;
698
699         dl = dhcpcd_decode_string_escape(dssid, sizeof(dssid), ssid);
700         if (dl == -1)
701                 return -1;
702
703         for (i = 0; i < dl; i++) {
704                 if (!isascii((int)dssid[i]) && !isprint((int)dssid[i]))
705                         break;
706         }
707         dp = dssid;
708         ep = essid;
709         if (i < dl) {
710                 /* Non standard characters found! Encode as hex string */
711                 unsigned char c;
712
713                 for (; dl; dl--) {
714                         c = (unsigned char)*dp++;
715                         *ep++ = hexchrs[(c & 0xf0) >> 4];
716                         *ep++ = hexchrs[(c & 0x0f)];
717                 }
718         } else {
719                 *ep++ = '\"';
720                 do
721                         *ep++ = *dp;
722                 while (*++dp != '\0');
723                 *ep++ = '\"';
724         }
725         *ep = '\0';
726
727         id = dhcpcd_wpa_network_new(wpa);
728         if (id != -1)
729                 dhcpcd_wpa_network_set(wpa, id, "ssid", essid);
730         return id;
731 }
732
733 void
734 dhcpcd_wpa_close(DHCPCD_WPA *wpa)
735 {
736
737         assert(wpa);
738
739         if (wpa->command_fd == -1 || !wpa->open)
740                 return;
741
742         wpa->open = false;
743         dhcpcd_attach_detach(wpa, false);
744         shutdown(wpa->command_fd, SHUT_RDWR);
745         shutdown(wpa->listen_fd, SHUT_RDWR);
746
747         if (wpa->con->wpa_status_cb)
748                 wpa->con->wpa_status_cb(wpa, "down",
749                     wpa->con->wpa_status_context);
750
751         close(wpa->command_fd);
752         wpa->command_fd = -1;
753         close(wpa->listen_fd);
754         wpa->listen_fd = -1;
755         unlink(wpa->command_path);
756         free(wpa->command_path);
757         wpa->command_path = NULL;
758         unlink(wpa->listen_path);
759         free(wpa->listen_path);
760         wpa->listen_path = NULL;
761 }
762
763 DHCPCD_WPA *
764 dhcpcd_wpa_find(DHCPCD_CONNECTION *con, const char *ifname)
765 {
766         DHCPCD_WPA *wpa;
767
768         for (wpa = con->wpa; wpa; wpa = wpa->next) {
769                 if (strcmp(wpa->ifname, ifname) == 0)
770                         return wpa;
771         }
772         errno = ENOENT;
773         return NULL;
774 }
775
776 DHCPCD_WPA *
777 dhcpcd_wpa_new(DHCPCD_CONNECTION *con, const char *ifname)
778 {
779         DHCPCD_WPA *wpa;
780
781         wpa = dhcpcd_wpa_find(con, ifname);
782         if (wpa)
783                 return wpa;
784
785         wpa = malloc(sizeof(*wpa));
786         if (wpa == NULL)
787                 return NULL;
788
789         wpa->con = con;
790         strlcpy(wpa->ifname, ifname, sizeof(wpa->ifname));
791         wpa->command_fd = wpa->listen_fd = -1;
792         wpa->command_path = wpa->listen_path = NULL;
793         wpa->next = con->wpa;
794         con->wpa = wpa;
795         return wpa;
796 }
797
798 DHCPCD_CONNECTION *
799 dhcpcd_wpa_connection(DHCPCD_WPA *wpa)
800 {
801
802         assert(wpa);
803         return wpa->con;
804 }
805
806 DHCPCD_IF *
807 dhcpcd_wpa_if(DHCPCD_WPA *wpa)
808 {
809
810         return dhcpcd_get_if(wpa->con, wpa->ifname, "link");
811 }
812
813 int
814 dhcpcd_wpa_open(DHCPCD_WPA *wpa)
815 {
816         int cmd_fd, list_fd = -1;
817         char *cmd_path = NULL, *list_path = NULL;
818
819         if (wpa->listen_fd != -1) {
820                 if (!wpa->open) {
821                         errno = EISCONN;
822                         return -1;
823                 }
824                 return wpa->listen_fd;
825         }
826
827         cmd_fd = wpa_open(wpa->ifname, &cmd_path);
828         if (cmd_fd == -1)
829                 goto fail;
830
831         list_fd = wpa_open(wpa->ifname, &list_path);
832         if (list_fd == -1)
833                 goto fail;
834
835         wpa->open = true;
836         wpa->attached = false;
837         wpa->command_fd = cmd_fd;
838         wpa->command_path = cmd_path;
839         wpa->listen_fd = list_fd;
840         wpa->listen_path = list_path;
841         if (!dhcpcd_attach_detach(wpa, true)) {
842                 dhcpcd_wpa_close(wpa);
843                 return -1;
844         }
845
846         if (wpa->con->wi_scanresults_cb)
847                 wpa->con->wi_scanresults_cb(wpa,
848                     wpa->con->wi_scanresults_context);
849
850         return wpa->listen_fd;
851
852 fail:
853         if (cmd_fd != -1)
854                 close(cmd_fd);
855         if (list_fd != -1)
856                 close(list_fd);
857         if (cmd_path)
858                 unlink(cmd_path);
859         free(cmd_path);
860         if (list_path)
861                 free(list_path);
862         return -1;
863 }
864
865 int
866 dhcpcd_wpa_get_fd(DHCPCD_WPA *wpa)
867 {
868
869         assert(wpa);
870         return wpa->open ? wpa->listen_fd : -1;
871 }
872
873 void
874 dhcpcd_wpa_set_scan_callback(DHCPCD_CONNECTION *con,
875     void (*cb)(DHCPCD_WPA *, void *), void *context)
876 {
877
878         assert(con);
879         con->wi_scanresults_cb = cb;
880         con->wi_scanresults_context = context;
881 }
882
883
884 void dhcpcd_wpa_set_status_callback(DHCPCD_CONNECTION * con,
885     void (*cb)(DHCPCD_WPA *, const char *, void *), void *context)
886 {
887
888         assert(con);
889         con->wpa_status_cb = cb;
890         con->wpa_status_context = context;
891 }
892
893 void
894 dhcpcd_wpa_dispatch(DHCPCD_WPA *wpa)
895 {
896         char buffer[256], *p;
897         size_t bytes;
898
899         assert(wpa);
900         bytes = (size_t)read(wpa->listen_fd, buffer, sizeof(buffer));
901         if ((ssize_t)bytes == -1 || bytes == 0) {
902                 dhcpcd_wpa_close(wpa);
903                 return;
904         }
905
906         buffer[bytes] = '\0';
907         bytes = strlen(buffer);
908         if (buffer[bytes - 1] == ' ')
909                 buffer[--bytes] = '\0';
910         for (p = buffer + 1; *p != '\0'; p++)
911                 if (*p == '>') {
912                         p++;
913                         break;
914                 }
915         if (strcmp(p, "CTRL-EVENT-SCAN-RESULTS") == 0 &&
916             wpa->con->wi_scanresults_cb)
917                 wpa->con->wi_scanresults_cb(wpa,
918                     wpa->con->wi_scanresults_context);
919         return;
920 }
921
922 void
923 dhcpcd_wpa_if_event(DHCPCD_IF *i)
924 {
925         DHCPCD_WPA *wpa;
926
927         assert(i);
928         if (strcmp(i->type, "link") == 0) {
929                 if (strcmp(i->reason, "STOPPED") == 0 ||
930                     strcmp(i->reason, "DEPARTED") == 0)
931                 {
932                         wpa = dhcpcd_wpa_find(i->con, i->ifname);
933                         if (wpa)
934                                 dhcpcd_wpa_close(wpa);
935                 } else if (i->wireless && i->con->wpa_started) {
936                         wpa = dhcpcd_wpa_new(i->con, i->ifname);
937                         if (wpa && wpa->listen_fd == -1)
938                                 dhcpcd_wpa_open(wpa);
939                 }
940         }
941 }
942
943 void
944 dhcpcd_wpa_start(DHCPCD_CONNECTION *con)
945 {
946         DHCPCD_IF *i;
947
948         assert(con);
949         con->wpa_started = true;
950
951         for (i = con->interfaces; i; i = i->next)
952                 dhcpcd_wpa_if_event(i);
953 }
954
955 int
956 dhcpcd_wpa_configure_psk(DHCPCD_WPA *wpa, DHCPCD_WI_SCAN *s, const char *psk)
957 {
958         const char *mgmt, *var;
959         int id;
960         char *npsk;
961         size_t psk_len;
962         bool r;
963
964         assert(wpa);
965         assert(s);
966
967         id = dhcpcd_wpa_network_find_new(wpa, s->ssid);
968         if (id == -1)
969                 return DHCPCD_WPA_ERR;
970
971         if (strcmp(s->flags, "[WEP]") == 0) {
972                 mgmt = "NONE";
973                 var = "wep_key0";
974         } else {
975                 mgmt = "WPA-PSK";
976                 var = "psk";
977         }
978
979         if (!dhcpcd_wpa_network_set(wpa, id, "key_mgmt", mgmt))
980                 return DHCPCD_WPA_ERR_SET;
981
982         if (psk)
983                 psk_len = strlen(psk);
984         else
985                 psk_len = 0;
986         npsk = malloc(psk_len + 3);
987         if (npsk == NULL)
988                 return DHCPCD_WPA_ERR;
989         npsk[0] = '"';
990         if (psk_len)
991                 memcpy(npsk + 1, psk, psk_len);
992         npsk[psk_len + 1] = '"';
993         npsk[psk_len + 2] = '\0';
994         r = dhcpcd_wpa_network_set(wpa, id, var, npsk);
995         free(npsk);
996         if (!r)
997                 return DHCPCD_WPA_ERR_SET_PSK;
998
999         if (!dhcpcd_wpa_network_enable(wpa, id))
1000                 return DHCPCD_WPA_ERR_ENABLE;
1001         if (!dhcpcd_wpa_reassociate(wpa))
1002                 return DHCPCD_WPA_ERR_ASSOC;
1003         if (!dhcpcd_wpa_config_write(wpa))
1004                 return DHCPCD_WPA_ERR_WRITE;
1005         return DHCPCD_WPA_SUCCESS;
1006 }