c74f682514e774a1537df5e472f81586db31c1c2
[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 static int
358 dhcpcd_wi_scan_compare(DHCPCD_WI_SCAN *a, DHCPCD_WI_SCAN *b)
359 {
360         int cmp;
361
362         /* Fist sort non case sensitive, then case sensitive */
363         cmp = strcasecmp(a->ssid, b->ssid);
364         if (cmp == 0)
365                 cmp = strcmp(a->ssid, b->ssid);
366
367         /* If still the same, return strongest first */
368         if (cmp == 0)
369                 cmp = b->strength.value - a->strength.value;
370
371         return cmp;
372 }
373
374 /*
375  * This function is copyright 2001 Simon Tatham.
376  *
377  * Permission is hereby granted, free of charge, to any person
378  * obtaining a copy of this software and associated documentation
379  * files (the "Software"), to deal in the Software without
380  * restriction, including without limitation the rights to use,
381  * copy, modify, merge, publish, distribute, sublicense, and/or
382  * sell copies of the Software, and to permit persons to whom the
383  * Software is furnished to do so, subject to the following
384  * conditions:
385  *
386  * The above copyright notice and this permission notice shall be
387  * included in all copies or substantial portions of the Software.
388  *
389  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
390  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
391  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
392  * NONINFRINGEMENT.  IN NO EVENT SHALL SIMON TATHAM BE LIABLE FOR
393  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
394  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
395  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
396  * SOFTWARE.
397  */
398 static DHCPCD_WI_SCAN *
399 dhcpcd_wi_scans_sort(DHCPCD_WI_SCAN *list)
400 {
401         DHCPCD_WI_SCAN *p, *q, *e, *tail;
402         size_t insize, nmerges, psize, qsize, i;
403
404         /* Silly special case: if `list' was passed in as NULL, return
405          * NULL immediately. */
406         if (!list)
407                 return NULL;
408
409         insize = 1;
410
411         for (;;) {
412                 p = list;
413                 list = tail = NULL;
414                 nmerges = 0;  /* count number of merges we do in this pass */
415
416                 while (p) {
417                         nmerges++;  /* there exists a merge to be done */
418                         /* step `insize' places along from p */
419                         q = p;
420                         psize = 0;
421                         for (i = 0; i < insize; i++) {
422                                 psize++;
423                                 q = q->next;
424                                 if (!q)
425                                         break;
426                         }
427
428                         /* if q hasn't fallen off end,
429                          * we have two lists to merge */
430                         qsize = insize;
431
432                         /* now we have two lists; merge them */
433                         while (psize > 0 || (qsize > 0 && q)) {
434                                 /* decide whether next element of merge comes
435                                  * from p or q */
436                                 if (psize == 0) {
437                                         /* p is empty; e must come from q. */
438                                         e = q; q = q->next; qsize--;
439                                 } else if (qsize == 0 || !q) {
440                                         /* q is empty; e must come from p. */
441                                         e = p; p = p->next; psize--;
442                                 } else if (dhcpcd_wi_scan_compare(p, q) <= 0) {
443                                         /* First element of p is lower
444                                          * (or same); e must come from p. */
445                                         e = p; p = p->next; psize--;
446                                 } else {
447                                         /* First element of q is lower;
448                                          * e must come from q. */
449                                         e = q; q = q->next; qsize--;
450                                 }
451
452                                 /* add the next element to the merged list */
453                                 if (tail)
454                                         tail->next = e;
455                                 else
456                                         list = e;
457                                 tail = e;
458                         }
459
460                         /* now p has stepped `insize' places along,
461                          * and q has too */
462                         p = q;
463                 }
464                 tail->next = NULL;
465
466                 /* If we have done only one merge, we're finished. */
467                 if (nmerges <= 1)   /* allow for nmerges==0, the empty list */
468                         return list;
469
470                 /* Otherwise repeat, merging lists twice the size */
471                 insize *= 2;
472         }
473 }
474
475 DHCPCD_WI_SCAN *
476 dhcpcd_wi_scans(DHCPCD_IF *i)
477 {
478         DHCPCD_WPA *wpa;
479         DHCPCD_WI_SCAN *wis, *w, *n, *p;
480         int nh;
481         DHCPCD_WI_HIST *h, *hl;
482
483         wpa = dhcpcd_wpa_find(i->con, i->ifname);
484         if (wpa == NULL)
485                 return NULL;
486         wis = dhcpcd_wpa_scans_read(wpa);
487
488         /* Sort the resultant list alphabetically and then by strength */
489         wis = dhcpcd_wi_scans_sort(wis);
490
491         p = NULL;
492         for (w = wis; w && (n = w->next, 1); w = n) {
493                 /* Currently we don't support non SSID broadcasting APs */
494                 if (*w->ssid == '\0') {
495                         if (p == NULL)
496                                 wis = n;
497                         else
498                                 p->next = n;
499                         free(w);
500                         continue;
501                 }
502                 /* Strip duplicated SSIDs, only show the strongest */
503                 if (p && strcmp(p->ssid, w->ssid) == 0) {
504                         p->next = n;
505                         free(w);
506                         continue;
507                 }
508                 /* Remember this as the previos next time */
509                 p = w;
510
511                 nh = 1;
512                 hl = NULL;
513                 w->quality.average = w->quality.value;
514                 w->noise.average = w->noise.value;
515                 w->level.average = w->level.value;
516                 w->strength.average = w->strength.value;
517
518                 for (h = wpa->con->wi_history; h; h = h->next) {
519                         if (strcmp(h->ifname, i->ifname) == 0 &&
520                             strcmp(h->bssid, wis->bssid) == 0)
521                         {
522                                 w->quality.average += h->quality;
523                                 w->noise.average += h->noise;
524                                 w->level.average += h->level;
525                                 w->strength.average += h->strength;
526                                 if (++nh == DHCPCD_WI_HIST_MAX) {
527                                         hl->next = h->next;
528                                         free(h);
529                                         break;
530                                 }
531                         }
532                         hl = h;
533                 }
534
535                 if (nh != 1) {
536                         w->quality.average /= nh;
537                         w->noise.average /= nh;
538                         w->level.average /= nh;
539                         w->strength.average /= nh;
540                 }
541                 h = malloc(sizeof(*h));
542                 if (h) {
543                         strlcpy(h->ifname, i->ifname, sizeof(h->ifname));
544                         strlcpy(h->bssid, w->bssid, sizeof(h->bssid));
545                         h->quality = w->quality.value;
546                         h->noise = w->noise.value;
547                         h->level = w->level.value;
548                         h->strength = w->strength.value;
549                         h->next = wpa->con->wi_history;
550                         wpa->con->wi_history = h;
551                 }
552         }
553
554         return wis;
555 }
556
557 bool
558 dhcpcd_wpa_reassociate(DHCPCD_WPA *wpa)
559 {
560
561         return dhcpcd_wpa_command(wpa, "REASSOCIATE");
562 }
563
564 bool
565 dhcpcd_wpa_disconnect(DHCPCD_WPA *wpa)
566 {
567
568         return dhcpcd_wpa_command(wpa, "DISCONNECT");
569 }
570
571 bool
572 dhcpcd_wpa_config_write(DHCPCD_WPA *wpa)
573 {
574
575         return dhcpcd_wpa_command(wpa, "SAVE_CONFIG");
576 }
577
578 static bool
579 dhcpcd_wpa_network(DHCPCD_WPA *wpa, const char *cmd, int id)
580 {
581         size_t len;
582
583         len = strlen(cmd) + 32;
584         if (!dhcpcd_realloc(wpa->con, len))
585                 return false;
586         snprintf(wpa->con->buf, wpa->con->buflen, "%s %d", cmd, id);
587         return dhcpcd_wpa_command(wpa, wpa->con->buf);
588 }
589
590 bool
591 dhcpcd_wpa_network_disable(DHCPCD_WPA *wpa, int id)
592 {
593
594         return dhcpcd_wpa_network(wpa, "DISABLE_NETWORK", id);
595 }
596
597 bool
598 dhcpcd_wpa_network_enable(DHCPCD_WPA *wpa, int id)
599 {
600
601         return dhcpcd_wpa_network(wpa, "ENABLE_NETWORK", id);
602 }
603
604 bool
605 dhcpcd_wpa_network_remove(DHCPCD_WPA *wpa, int id)
606 {
607
608         return dhcpcd_wpa_network(wpa, "REMOVE_NETWORK", id);
609 }
610
611 char *
612 dhcpcd_wpa_network_get(DHCPCD_WPA *wpa, int id, const char *param)
613 {
614         ssize_t bytes;
615
616         if (!dhcpcd_realloc(wpa->con, 2048))
617                 return NULL;
618         snprintf(wpa->con->buf, wpa->con->buflen, "GET_NETWORK %d %s",
619             id, param);
620         bytes = wpa_cmd(wpa->command_fd, wpa->con->buf,
621             wpa->con->buf, wpa->con->buflen);
622         if (bytes == 0 || bytes == -1)
623                 return NULL;
624         if (strcmp(wpa->con->buf, "FAIL\n") == 0) {
625                 errno = EINVAL;
626                 return NULL;
627         }
628         return wpa->con->buf;
629 }
630
631 bool
632 dhcpcd_wpa_network_set(DHCPCD_WPA *wpa, int id,
633     const char *param, const char *value)
634 {
635         size_t len;
636
637         len = strlen("SET_NETWORK") + 32 + strlen(param) + strlen(value) + 3;
638         if (!dhcpcd_realloc(wpa->con, len))
639                 return false;
640         snprintf(wpa->con->buf, wpa->con->buflen, "SET_NETWORK %d %s %s",
641             id, param, value);
642         return dhcpcd_wpa_command(wpa, wpa->con->buf);
643 }
644
645 static int
646 dhcpcd_wpa_network_find(DHCPCD_WPA *wpa, const char *fssid)
647 {
648         ssize_t bytes, dl, tl;
649         size_t fl;
650         char *s, *t, *ssid, *bssid, *flags;
651         char dssid[IF_SSIDSIZE], tssid[IF_SSIDSIZE];
652         long l;
653
654         dhcpcd_realloc(wpa->con, 2048);
655         bytes = wpa_cmd(wpa->command_fd, "LIST_NETWORKS",
656             wpa->con->buf, wpa->con->buflen);
657         if (bytes == 0 || bytes == -1)
658                 return -1;
659
660         fl = strlen(fssid);
661
662         s = strchr(wpa->con->buf, '\n');
663         if (s == NULL)
664                 return -1;
665         while ((t = strsep(&s, "\b"))) {
666                 if (*t == '\0')
667                         continue;
668                 ssid = strchr(t, '\t');
669                 if (ssid == NULL)
670                         break;
671                 *ssid++ = '\0';
672                 bssid = strchr(ssid, '\t');
673                 if (bssid == NULL)
674                         break;
675                 *bssid++ = '\0';
676                 flags = strchr(bssid, '\t');
677                 if (flags == NULL)
678                         break;
679                 *flags++ = '\0';
680                 l = strtol(t, NULL, 0);
681                 if (l < 0 || l > INT_MAX) {
682                         errno = ERANGE;
683                         break;
684                 }
685
686                 /* Decode the wpa_supplicant SSID into raw chars and
687                  * then encode into our octal escaped string to
688                  * compare. */
689                 dl = dhcpcd_wpa_decode_ssid(dssid, sizeof(dssid), ssid);
690                 if (dl == -1)
691                         return -1;
692                 tl = dhcpcd_encode_string_escape(tssid,
693                     sizeof(tssid), dssid, (size_t)dl);
694                 if (tl == -1)
695                         return -1;
696                 if ((size_t)tl == fl && memcmp(tssid, fssid, (size_t)tl) == 0)
697                         return (int)l;
698         }
699         errno = ENOENT;
700         return -1;
701 }
702
703 static int
704 dhcpcd_wpa_network_new(DHCPCD_WPA *wpa)
705 {
706         ssize_t bytes;
707         long l;
708
709         dhcpcd_realloc(wpa->con, 32);
710         bytes = wpa_cmd(wpa->command_fd, "ADD_NETWORK",
711             wpa->con->buf, sizeof(wpa->con->buf));
712         if (bytes == 0 || bytes == -1)
713                 return -1;
714         l = strtol(wpa->con->buf, NULL, 0);
715         if (l < 0 || l > INT_MAX) {
716                 errno = ERANGE;
717                 return -1;
718         }
719         return (int)l;
720 }
721
722 static const char hexchrs[] = "0123456789abcdef";
723 int
724 dhcpcd_wpa_network_find_new(DHCPCD_WPA *wpa, const char *ssid)
725 {
726         int id;
727         char dssid[IF_SSIDSIZE], essid[IF_SSIDSIZE], *ep;
728         ssize_t dl, i;
729         char *dp;
730
731         id = dhcpcd_wpa_network_find(wpa, ssid);
732         if (id != -1)
733                 return id;
734
735         dl = dhcpcd_decode_string_escape(dssid, sizeof(dssid), ssid);
736         if (dl == -1)
737                 return -1;
738
739         for (i = 0; i < dl; i++) {
740                 if (!isascii((int)dssid[i]) && !isprint((int)dssid[i]))
741                         break;
742         }
743         dp = dssid;
744         ep = essid;
745         if (i < dl) {
746                 /* Non standard characters found! Encode as hex string */
747                 unsigned char c;
748
749                 for (; dl; dl--) {
750                         c = (unsigned char)*dp++;
751                         *ep++ = hexchrs[(c & 0xf0) >> 4];
752                         *ep++ = hexchrs[(c & 0x0f)];
753                 }
754         } else {
755                 *ep++ = '\"';
756                 do
757                         *ep++ = *dp;
758                 while (*++dp != '\0');
759                 *ep++ = '\"';
760         }
761         *ep = '\0';
762
763         id = dhcpcd_wpa_network_new(wpa);
764         if (id != -1)
765                 dhcpcd_wpa_network_set(wpa, id, "ssid", essid);
766         return id;
767 }
768
769 void
770 dhcpcd_wpa_close(DHCPCD_WPA *wpa)
771 {
772
773         assert(wpa);
774
775         if (wpa->command_fd == -1 || !wpa->open)
776                 return;
777
778         wpa->open = false;
779         dhcpcd_attach_detach(wpa, false);
780         shutdown(wpa->command_fd, SHUT_RDWR);
781         shutdown(wpa->listen_fd, SHUT_RDWR);
782
783         if (wpa->con->wpa_status_cb)
784                 wpa->con->wpa_status_cb(wpa, "down",
785                     wpa->con->wpa_status_context);
786
787         close(wpa->command_fd);
788         wpa->command_fd = -1;
789         close(wpa->listen_fd);
790         wpa->listen_fd = -1;
791         unlink(wpa->command_path);
792         free(wpa->command_path);
793         wpa->command_path = NULL;
794         unlink(wpa->listen_path);
795         free(wpa->listen_path);
796         wpa->listen_path = NULL;
797 }
798
799 DHCPCD_WPA *
800 dhcpcd_wpa_find(DHCPCD_CONNECTION *con, const char *ifname)
801 {
802         DHCPCD_WPA *wpa;
803
804         for (wpa = con->wpa; wpa; wpa = wpa->next) {
805                 if (strcmp(wpa->ifname, ifname) == 0)
806                         return wpa;
807         }
808         errno = ENOENT;
809         return NULL;
810 }
811
812 DHCPCD_WPA *
813 dhcpcd_wpa_new(DHCPCD_CONNECTION *con, const char *ifname)
814 {
815         DHCPCD_WPA *wpa;
816
817         wpa = dhcpcd_wpa_find(con, ifname);
818         if (wpa)
819                 return wpa;
820
821         wpa = malloc(sizeof(*wpa));
822         if (wpa == NULL)
823                 return NULL;
824
825         wpa->con = con;
826         strlcpy(wpa->ifname, ifname, sizeof(wpa->ifname));
827         wpa->command_fd = wpa->listen_fd = -1;
828         wpa->command_path = wpa->listen_path = NULL;
829         wpa->next = con->wpa;
830         con->wpa = wpa;
831         return wpa;
832 }
833
834 DHCPCD_CONNECTION *
835 dhcpcd_wpa_connection(DHCPCD_WPA *wpa)
836 {
837
838         assert(wpa);
839         return wpa->con;
840 }
841
842 DHCPCD_IF *
843 dhcpcd_wpa_if(DHCPCD_WPA *wpa)
844 {
845
846         return dhcpcd_get_if(wpa->con, wpa->ifname, "link");
847 }
848
849 int
850 dhcpcd_wpa_open(DHCPCD_WPA *wpa)
851 {
852         int cmd_fd, list_fd = -1;
853         char *cmd_path = NULL, *list_path = NULL;
854
855         if (wpa->listen_fd != -1) {
856                 if (!wpa->open) {
857                         errno = EISCONN;
858                         return -1;
859                 }
860                 return wpa->listen_fd;
861         }
862
863         cmd_fd = wpa_open(wpa->ifname, &cmd_path);
864         if (cmd_fd == -1)
865                 goto fail;
866
867         list_fd = wpa_open(wpa->ifname, &list_path);
868         if (list_fd == -1)
869                 goto fail;
870
871         wpa->open = true;
872         wpa->attached = false;
873         wpa->command_fd = cmd_fd;
874         wpa->command_path = cmd_path;
875         wpa->listen_fd = list_fd;
876         wpa->listen_path = list_path;
877         if (!dhcpcd_attach_detach(wpa, true)) {
878                 dhcpcd_wpa_close(wpa);
879                 return -1;
880         }
881
882         if (wpa->con->wi_scanresults_cb)
883                 wpa->con->wi_scanresults_cb(wpa,
884                     wpa->con->wi_scanresults_context);
885
886         return wpa->listen_fd;
887
888 fail:
889         if (cmd_fd != -1)
890                 close(cmd_fd);
891         if (list_fd != -1)
892                 close(list_fd);
893         if (cmd_path)
894                 unlink(cmd_path);
895         free(cmd_path);
896         if (list_path)
897                 free(list_path);
898         return -1;
899 }
900
901 int
902 dhcpcd_wpa_get_fd(DHCPCD_WPA *wpa)
903 {
904
905         assert(wpa);
906         return wpa->open ? wpa->listen_fd : -1;
907 }
908
909 void
910 dhcpcd_wpa_set_scan_callback(DHCPCD_CONNECTION *con,
911     void (*cb)(DHCPCD_WPA *, void *), void *context)
912 {
913
914         assert(con);
915         con->wi_scanresults_cb = cb;
916         con->wi_scanresults_context = context;
917 }
918
919
920 void dhcpcd_wpa_set_status_callback(DHCPCD_CONNECTION * con,
921     void (*cb)(DHCPCD_WPA *, const char *, void *), void *context)
922 {
923
924         assert(con);
925         con->wpa_status_cb = cb;
926         con->wpa_status_context = context;
927 }
928
929 void
930 dhcpcd_wpa_dispatch(DHCPCD_WPA *wpa)
931 {
932         char buffer[256], *p;
933         size_t bytes;
934
935         assert(wpa);
936         bytes = (size_t)read(wpa->listen_fd, buffer, sizeof(buffer));
937         if ((ssize_t)bytes == -1 || bytes == 0) {
938                 dhcpcd_wpa_close(wpa);
939                 return;
940         }
941
942         buffer[bytes] = '\0';
943         bytes = strlen(buffer);
944         if (buffer[bytes - 1] == ' ')
945                 buffer[--bytes] = '\0';
946         for (p = buffer + 1; *p != '\0'; p++)
947                 if (*p == '>') {
948                         p++;
949                         break;
950                 }
951         if (strcmp(p, "CTRL-EVENT-SCAN-RESULTS") == 0 &&
952             wpa->con->wi_scanresults_cb)
953                 wpa->con->wi_scanresults_cb(wpa,
954                     wpa->con->wi_scanresults_context);
955         return;
956 }
957
958 void
959 dhcpcd_wpa_if_event(DHCPCD_IF *i)
960 {
961         DHCPCD_WPA *wpa;
962
963         assert(i);
964         if (strcmp(i->type, "link") == 0) {
965                 if (strcmp(i->reason, "STOPPED") == 0 ||
966                     strcmp(i->reason, "DEPARTED") == 0)
967                 {
968                         wpa = dhcpcd_wpa_find(i->con, i->ifname);
969                         if (wpa)
970                                 dhcpcd_wpa_close(wpa);
971                 } else if (i->wireless && i->con->wpa_started) {
972                         wpa = dhcpcd_wpa_new(i->con, i->ifname);
973                         if (wpa && wpa->listen_fd == -1)
974                                 dhcpcd_wpa_open(wpa);
975                 }
976         }
977 }
978
979 void
980 dhcpcd_wpa_start(DHCPCD_CONNECTION *con)
981 {
982         DHCPCD_IF *i;
983
984         assert(con);
985         con->wpa_started = true;
986
987         for (i = con->interfaces; i; i = i->next)
988                 dhcpcd_wpa_if_event(i);
989 }
990
991 int
992 dhcpcd_wpa_configure_psk(DHCPCD_WPA *wpa, DHCPCD_WI_SCAN *s, const char *psk)
993 {
994         const char *mgmt, *var;
995         int id;
996         char *npsk;
997         size_t psk_len;
998         bool r;
999
1000         assert(wpa);
1001         assert(s);
1002
1003         id = dhcpcd_wpa_network_find_new(wpa, s->ssid);
1004         if (id == -1)
1005                 return DHCPCD_WPA_ERR;
1006
1007         if (strcmp(s->flags, "[WEP]") == 0) {
1008                 mgmt = "NONE";
1009                 var = "wep_key0";
1010         } else {
1011                 mgmt = "WPA-PSK";
1012                 var = "psk";
1013         }
1014
1015         if (!dhcpcd_wpa_network_set(wpa, id, "key_mgmt", mgmt))
1016                 return DHCPCD_WPA_ERR_SET;
1017
1018         if (psk)
1019                 psk_len = strlen(psk);
1020         else
1021                 psk_len = 0;
1022         npsk = malloc(psk_len + 3);
1023         if (npsk == NULL)
1024                 return DHCPCD_WPA_ERR;
1025         npsk[0] = '"';
1026         if (psk_len)
1027                 memcpy(npsk + 1, psk, psk_len);
1028         npsk[psk_len + 1] = '"';
1029         npsk[psk_len + 2] = '\0';
1030         r = dhcpcd_wpa_network_set(wpa, id, var, npsk);
1031         free(npsk);
1032         if (!r)
1033                 return DHCPCD_WPA_ERR_SET_PSK;
1034
1035         if (!dhcpcd_wpa_network_enable(wpa, id))
1036                 return DHCPCD_WPA_ERR_ENABLE;
1037         if (!dhcpcd_wpa_reassociate(wpa))
1038                 return DHCPCD_WPA_ERR_ASSOC;
1039         if (!dhcpcd_wpa_config_write(wpa))
1040                 return DHCPCD_WPA_ERR_WRITE;
1041         return DHCPCD_WPA_SUCCESS;
1042 }