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