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 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 }