package/wprobe/src/user/wprobe-lib.c

   1 /*
   2  * wprobe.c: Wireless probe user space library
   3  * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #define _ISOC99_SOURCE
  17 #define _BSD_SOURCE
  18 #include <sys/types.h>
  19 #include <sys/socket.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24 #include <getopt.h>
  25 #include <unistd.h>
  26 #include <stdbool.h>
  27 #include <math.h>
  28 #include <linux/wprobe.h>
  29 #include <netlink/netlink.h>
  30 #include <netlink/attr.h>
  31 #include <netlink/genl/genl.h>
  32 #ifndef NO_LOCAL_ACCESS
  33 #include <netlink/genl/ctrl.h>
  34 #include <netlink/genl/family.h>
  35 #include <endian.h>
  36 #endif
  37 #include "wprobe.h"
  38
  39 #define DEBUG 1
  40 #ifdef DEBUG
  41 #define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
  42 #else
  43 #define DPRINTF(fmt, ...) do {} while (0)
  44 #endif
  45
  46 #if defined(BYTE_ORDER) && !defined(__BYTE_ORDER)
  47 #define __LITTLE_ENDIAN LITTLE_ENDIAN
  48 #define __BIG_ENDIAN BIG_ENDIAN
  49 #define __BYTE_ORDER BYTE_ORDER
  50 #endif
  51
  52 #ifndef __BYTE_ORDER
  53 #error Unknown endian type
  54 #endif
  55
  56 #define WPROBE_MAX_MSGLEN       65536
  57
  58 static inline __u16 __swab16(__u16 x)
  59 {
  60         return x<<8 | x>>8;
  61 }
  62
  63 static inline __u32 __swab32(__u32 x)
  64 {
  65         return x<<24 | x>>24 |
  66                 (x & (__u32)0x0000ff00UL)<<8 |
  67                 (x & (__u32)0x00ff0000UL)>>8;
  68 }
  69
  70 static inline __u64 __swab64(__u64 x)
  71 {
  72         return x<<56 | x>>56 |
  73                 (x & (__u64)0x000000000000ff00ULL)<<40 |
  74                 (x & (__u64)0x0000000000ff0000ULL)<<24 |
  75                 (x & (__u64)0x00000000ff000000ULL)<< 8 |
  76                 (x & (__u64)0x000000ff00000000ULL)>> 8 |
  77                 (x & (__u64)0x0000ff0000000000ULL)>>24 |
  78                 (x & (__u64)0x00ff000000000000ULL)>>40;
  79 }
  80
  81
  82 #if __BYTE_ORDER == __LITTLE_ENDIAN
  83 #define SWAP16(var) var = __swab16(var)
  84 #define SWAP32(var) var = __swab32(var)
  85 #define SWAP64(var) var = __swab64(var)
  86 #else
  87 #define SWAP16(var) do {} while(0)
  88 #define SWAP32(var) do {} while(0)
  89 #define SWAP64(var) do {} while(0)
  90 #endif
  91
  92 int wprobe_port = 17990;
  93 static struct nlattr *tb[WPROBE_ATTR_LAST+1];
  94 static struct nla_policy attribute_policy[WPROBE_ATTR_LAST+1] = {
  95         [WPROBE_ATTR_ID] = { .type = NLA_U32 },
  96         [WPROBE_ATTR_MAC] = { .type = NLA_UNSPEC, .minlen = 6, .maxlen = 6 },
  97         [WPROBE_ATTR_NAME] = { .type = NLA_STRING },
  98         [WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
  99         [WPROBE_ATTR_TYPE] = { .type = NLA_U8 },
 100         [WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
 101         [WPROBE_VAL_S8] = { .type = NLA_U8 },
 102         [WPROBE_VAL_S16] = { .type = NLA_U16 },
 103         [WPROBE_VAL_S32] = { .type = NLA_U32 },
 104         [WPROBE_VAL_S64] = { .type = NLA_U64 },
 105         [WPROBE_VAL_U8] = { .type = NLA_U8 },
 106         [WPROBE_VAL_U16] = { .type = NLA_U16 },
 107         [WPROBE_VAL_U32] = { .type = NLA_U32 },
 108         [WPROBE_VAL_U64] = { .type = NLA_U64 },
 109         [WPROBE_VAL_SUM] = { .type = NLA_U64 },
 110         [WPROBE_VAL_SUM_SQ] = { .type = NLA_U64 },
 111         [WPROBE_VAL_SAMPLES] = { .type = NLA_U32 },
 112         [WPROBE_VAL_SCALE_TIME] = { .type = NLA_U64 },
 113         [WPROBE_ATTR_INTERVAL] = { .type = NLA_U64 },
 114         [WPROBE_ATTR_SAMPLES_MIN] = { .type = NLA_U32 },
 115         [WPROBE_ATTR_SAMPLES_MAX] = { .type = NLA_U32 },
 116         [WPROBE_ATTR_SAMPLES_SCALE_M] = { .type = NLA_U32 },
 117         [WPROBE_ATTR_SAMPLES_SCALE_D] = { .type = NLA_U32 },
 118         [WPROBE_ATTR_FILTER_GROUP] = { .type = NLA_NESTED },
 119         [WPROBE_ATTR_RXCOUNT] = { .type = NLA_U64 },
 120         [WPROBE_ATTR_TXCOUNT] = { .type = NLA_U64 },
 121 };
 122
 123 typedef int (*wprobe_cb_t)(struct nl_msg *, void *);
 124
 125 struct wprobe_iface_ops {
 126         int (*send_msg)(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t cb, void *arg);
 127         void (*free)(struct wprobe_iface *dev);
 128 };
 129
 130 struct wprobe_attr_cb {
 131         struct list_head *list;
 132         char *addr;
 133 };
 134
 135 #define WPROBE_MAGIC_STR "WPROBE"
 136 struct wprobe_init_hdr {
 137         struct {
 138                 char magic[sizeof(WPROBE_MAGIC_STR)];
 139
 140                 /* protocol version */
 141                 uint8_t version;
 142
 143                 /* extra header length (unused for now) */
 144                 uint16_t extra;
 145         } pre __attribute__((packed));
 146         union {
 147                 struct {
 148                         uint16_t genl_family;
 149                 } v0 __attribute__((packed));
 150         };
 151 } __attribute__((packed));
 152
 153 struct wprobe_msg_hdr {
 154         __u16 status;
 155         __u16 error;
 156         __u32 len;
 157 };
 158
 159 enum wprobe_resp_status {
 160         WPROBE_MSG_DONE = 0,
 161         WPROBE_MSG_DATA = 1,
 162 };
 163
 164 static inline void
 165 wprobe_swap_msg_hdr(struct wprobe_msg_hdr *mhdr)
 166 {
 167         SWAP16(mhdr->status);
 168         SWAP16(mhdr->error);
 169         SWAP32(mhdr->len);
 170 }
 171
 172 static int
 173 save_attribute_handler(struct nl_msg *msg, void *arg)
 174 {
 175         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 176         const char *name = "N/A";
 177         struct wprobe_attribute *attr;
 178         int type = 0;
 179         struct wprobe_attr_cb *cb = arg;
 180
 181         nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
 182                         genlmsg_attrlen(gnlh, 0), attribute_policy);
 183
 184         if (tb[WPROBE_ATTR_NAME])
 185                 name = nla_data(tb[WPROBE_ATTR_NAME]);
 186
 187         attr = malloc(sizeof(struct wprobe_attribute) + strlen(name) + 1);
 188         if (!attr)
 189                 return -1;
 190
 191         memset(attr, 0, sizeof(struct wprobe_attribute));
 192
 193         if (tb[WPROBE_ATTR_ID])
 194                 attr->id = nla_get_u32(tb[WPROBE_ATTR_ID]);
 195
 196         if (tb[WPROBE_ATTR_MAC] && cb->addr)
 197                 memcpy(cb->addr, nla_data(tb[WPROBE_ATTR_MAC]), 6);
 198
 199         if (tb[WPROBE_ATTR_FLAGS])
 200                 attr->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
 201
 202         if (tb[WPROBE_ATTR_TYPE])
 203                 type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
 204
 205         if ((type < WPROBE_VAL_STRING) ||
 206                 (type > WPROBE_VAL_U64))
 207                 type = 0;
 208
 209         attr->type = type;
 210         strcpy(attr->name, name);
 211         INIT_LIST_HEAD(&attr->list);
 212         list_add(&attr->list, cb->list);
 213         return 0;
 214 }
 215
 216 static struct nl_msg *
 217 wprobe_new_msg(struct wprobe_iface *dev, int cmd, bool dump)
 218 {
 219         struct nl_msg *msg;
 220         uint32_t flags = 0;
 221
 222         msg = nlmsg_alloc_size(65536);
 223         if (!msg)
 224                 return NULL;
 225
 226         if (dump)
 227                 flags |= NLM_F_DUMP;
 228
 229         genlmsg_put(msg, 0, 0, dev->genl_family,
 230                         0, flags, cmd, 0);
 231
 232         NLA_PUT_STRING(msg, WPROBE_ATTR_INTERFACE, dev->ifname);
 233 nla_put_failure:
 234         return msg;
 235 }
 236
 237
 238 static int
 239 dump_attributes(struct wprobe_iface *dev, bool link, struct list_head *list, char *addr)
 240 {
 241         struct nl_msg *msg;
 242         struct wprobe_attr_cb cb;
 243
 244         cb.list = list;
 245         cb.addr = addr;
 246         msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LIST, true);
 247         if (!msg)
 248                 return -ENOMEM;
 249
 250         if (link)
 251                 NLA_PUT(msg, WPROBE_ATTR_MAC, 6, "\x00\x00\x00\x00\x00\x00");
 252
 253         return dev->ops->send_msg(dev, msg, save_attribute_handler, &cb);
 254
 255 nla_put_failure:
 256         nlmsg_free(msg);
 257         return -EINVAL;
 258 }
 259
 260 static struct wprobe_iface *
 261 wprobe_alloc_dev(void)
 262 {
 263         struct wprobe_iface *dev;
 264
 265         dev = malloc(sizeof(struct wprobe_iface));
 266         if (!dev)
 267                 return NULL;
 268
 269         memset(dev, 0, sizeof(struct wprobe_iface));
 270
 271         dev->interval = -1;
 272         dev->scale_min = -1;
 273         dev->scale_max = -1;
 274         dev->scale_m = -1;
 275         dev->scale_d = -1;
 276         dev->sockfd = -1;
 277
 278         INIT_LIST_HEAD(&dev->global_attr);
 279         INIT_LIST_HEAD(&dev->link_attr);
 280         INIT_LIST_HEAD(&dev->links);
 281         return dev;
 282 }
 283
 284 static int
 285 wprobe_init_dev(struct wprobe_iface *dev)
 286 {
 287         dump_attributes(dev, false, &dev->global_attr, NULL);
 288         dump_attributes(dev, true, &dev->link_attr, NULL);
 289         return 0;
 290 }
 291
 292 #ifndef NO_LOCAL_ACCESS
 293 static int n_devs = 0;
 294 static struct nl_sock *handle = NULL;
 295 static struct nl_cache *cache = NULL;
 296 static struct genl_family *family = NULL;
 297
 298 static int
 299 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 300 {
 301         int *ret = arg;
 302         *ret = err->error;
 303         return NL_STOP;
 304 }
 305
 306 static int
 307 finish_handler(struct nl_msg *msg, void *arg)
 308 {
 309         int *ret = arg;
 310         *ret = 0;
 311         return NL_SKIP;
 312 }
 313
 314 static int
 315 ack_handler(struct nl_msg *msg, void *arg)
 316 {
 317         int *ret = arg;
 318         *ret = 0;
 319         return NL_STOP;
 320 }
 321
 322 static void
 323 wprobe_local_free(struct wprobe_iface *dev)
 324 {
 325         /* should not happen */
 326         if (n_devs == 0)
 327                 return;
 328
 329         if (--n_devs != 0)
 330                 return;
 331
 332         if (cache)
 333                 nl_cache_free(cache);
 334         if (handle)
 335                 nl_socket_free(handle);
 336         handle = NULL;
 337         cache = NULL;
 338 }
 339
 340 static int
 341 wprobe_local_init(void)
 342 {
 343         int ret;
 344
 345         if (n_devs++ > 0)
 346                 return 0;
 347
 348         handle = nl_socket_alloc();
 349         if (!handle) {
 350                 DPRINTF("Failed to create handle\n");
 351                 goto err;
 352         }
 353
 354         if (genl_connect(handle)) {
 355                 DPRINTF("Failed to connect to generic netlink\n");
 356                 goto err;
 357         }
 358
 359         ret = genl_ctrl_alloc_cache(handle, &cache);
 360         if (ret < 0) {
 361                 DPRINTF("Failed to allocate netlink cache\n");
 362                 goto err;
 363         }
 364
 365         family = genl_ctrl_search_by_name(cache, "wprobe");
 366         if (!family) {
 367                 DPRINTF("wprobe API not present\n");
 368                 goto err;
 369         }
 370         return 0;
 371
 372 err:
 373         wprobe_local_free(NULL);
 374         return -EINVAL;
 375 }
 376
 377
 378 static int
 379 wprobe_local_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
 380 {
 381         struct nl_cb *cb;
 382         int err = 0;
 383
 384         cb = nl_cb_alloc(NL_CB_DEFAULT);
 385         if (!cb)
 386                 goto out_no_cb;
 387
 388         if (callback)
 389                 nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback, arg);
 390
 391         err = nl_send_auto_complete(handle, msg);
 392         if (err < 0)
 393                 goto out;
 394
 395         err = 1;
 396
 397         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
 398         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
 399         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
 400
 401         while (err > 0)
 402                 nl_recvmsgs(handle, cb);
 403
 404 out:
 405         nl_cb_put(cb);
 406 out_no_cb:
 407         nlmsg_free(msg);
 408         return err;
 409 }
 410
 411 static const struct wprobe_iface_ops wprobe_local_ops = {
 412         .send_msg = wprobe_local_send_msg,
 413         .free = wprobe_local_free,
 414 };
 415
 416 struct wprobe_iface *
 417 wprobe_get_dev(const char *ifname)
 418 {
 419         struct wprobe_iface *dev;
 420
 421         if (wprobe_local_init() != 0)
 422                 return NULL;
 423
 424         dev = wprobe_alloc_dev();
 425         if (!dev)
 426                 goto error_alloc;
 427
 428         dev->ifname = strdup(ifname);
 429         dev->ops = &wprobe_local_ops;
 430         dev->genl_family = genl_family_get_id(family);
 431
 432         if (wprobe_init_dev(dev) < 0)
 433                 goto error;
 434
 435         return dev;
 436
 437 error:
 438         free(dev);
 439 error_alloc:
 440         wprobe_local_free(NULL);
 441         return NULL;
 442 }
 443
 444 #endif
 445
 446 static void swap_nlmsghdr(struct nlmsghdr *nlh)
 447 {
 448         SWAP32(nlh->nlmsg_len);
 449         SWAP16(nlh->nlmsg_type);
 450         SWAP16(nlh->nlmsg_flags);
 451         SWAP32(nlh->nlmsg_seq);
 452         SWAP32(nlh->nlmsg_pid);
 453 }
 454
 455 static void swap_genlmsghdr(struct genlmsghdr *gnlh)
 456 {
 457 #if 0 /* probably unnecessary */
 458         SWAP16(gnlh->reserved);
 459 #endif
 460 }
 461
 462 static void
 463 wprobe_swap_nested(void *data, int len, bool outgoing)
 464 {
 465         void *end = data + len;
 466
 467         while (data < end) {
 468                 struct nlattr *nla = data;
 469                 unsigned int type, len;
 470
 471                 if (!outgoing) {
 472                         SWAP16(nla->nla_len);
 473                         SWAP16(nla->nla_type);
 474
 475                         /* required for further sanity checks */
 476                         if (data + nla->nla_len > end)
 477                                 nla->nla_len = end - data;
 478                 }
 479
 480                 len = NLA_ALIGN(nla->nla_len);
 481                 type = nla->nla_type & NLA_TYPE_MASK;
 482
 483                 if (type <= WPROBE_ATTR_LAST) {
 484 #if __BYTE_ORDER == __LITTLE_ENDIAN
 485                         switch(attribute_policy[type].type) {
 486                         case NLA_U16:
 487                                 SWAP16(*(__u16 *)nla_data(nla));
 488                                 break;
 489                         case NLA_U32:
 490                                 SWAP32(*(__u32 *)nla_data(nla));
 491                                 break;
 492                         case NLA_U64:
 493                                 SWAP64(*(__u64 *)nla_data(nla));
 494                                 break;
 495                         case NLA_NESTED:
 496                                 wprobe_swap_nested(nla_data(nla), nla_len(nla), outgoing);
 497                                 break;
 498                         }
 499 #endif
 500                 }
 501                 data += len;
 502
 503                 if (outgoing) {
 504                         SWAP16(nla->nla_len);
 505                         SWAP16(nla->nla_type);
 506                 }
 507                 if (!nla->nla_len)
 508                         break;
 509         }
 510 }
 511
 512 static struct nl_msg *
 513 wprobe_msg_from_network(int socket, int len)
 514 {
 515         struct genlmsghdr *gnlh;
 516         struct nlmsghdr *nlh;
 517         struct nl_msg *msg;
 518         void *data;
 519
 520         msg = nlmsg_alloc_size(len + 32);
 521         if (!msg)
 522                 return NULL;
 523
 524         nlh = nlmsg_hdr(msg);
 525         if (read(socket, nlh, len) != len)
 526                 goto free;
 527
 528         swap_nlmsghdr(nlh);
 529         if (nlh->nlmsg_len > len)
 530                 goto free;
 531
 532         gnlh = nlmsg_data(nlh);
 533         swap_genlmsghdr(gnlh);
 534
 535         data = genlmsg_data(gnlh);
 536         wprobe_swap_nested(data, genlmsg_len(gnlh), false);
 537
 538         return msg;
 539 free:
 540         nlmsg_free(msg);
 541         return NULL;
 542 }
 543
 544 static int
 545 wprobe_msg_to_network(int socket, struct nl_msg *msg)
 546 {
 547         struct nlmsghdr *nlh = nlmsg_hdr(msg);
 548         struct wprobe_msg_hdr mhdr;
 549         struct genlmsghdr *gnlh;
 550         void *buf, *data;
 551         int buflen, datalen;
 552         int ret;
 553
 554         buflen = nlh->nlmsg_len;
 555         buf = malloc(buflen);
 556         if (!buf)
 557                 return -ENOMEM;
 558
 559         memset(&mhdr, 0, sizeof(mhdr));
 560         mhdr.status = WPROBE_MSG_DATA;
 561         mhdr.len = buflen;
 562         wprobe_swap_msg_hdr(&mhdr);
 563         write(socket, &mhdr, sizeof(mhdr));
 564
 565         memcpy(buf, nlh, buflen);
 566         nlh = buf;
 567         gnlh = nlmsg_data(nlh);
 568         data = genlmsg_data(gnlh);
 569         datalen = genlmsg_len(gnlh);
 570
 571         wprobe_swap_nested(data, datalen, true);
 572         swap_genlmsghdr(gnlh);
 573         swap_nlmsghdr(nlh);
 574         ret = write(socket, buf, buflen);
 575         free(buf);
 576
 577         return ret;
 578 }
 579
 580 static int
 581 wprobe_remote_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
 582 {
 583         struct wprobe_msg_hdr mhdr;
 584         int msgs = 0;
 585
 586         wprobe_msg_to_network(dev->sockfd, msg);
 587         nlmsg_free(msg);
 588         do {
 589                 if (read(dev->sockfd, &mhdr, sizeof(mhdr)) != sizeof(mhdr)) {
 590                         DPRINTF("Failed to read response header\n");
 591                         return -1;
 592                 }
 593                 wprobe_swap_msg_hdr(&mhdr);
 594
 595                 switch(mhdr.status) {
 596                 case WPROBE_MSG_DATA:
 597                         if (mhdr.len > WPROBE_MAX_MSGLEN) {
 598                                 fprintf(stderr, "Invalid length in received response message.\n");
 599                                 exit(1);
 600                         }
 601
 602                         msg = wprobe_msg_from_network(dev->sockfd, mhdr.len);
 603                         if (!msg)
 604                                 return -EINVAL;
 605
 606                         msgs++;
 607                         callback(msg, arg);
 608                         nlmsg_free(msg);
 609                         break;
 610                 }
 611         } while (mhdr.status != WPROBE_MSG_DONE);
 612
 613         if (mhdr.error)
 614                 return -mhdr.error;
 615         else
 616                 return msgs;
 617 }
 618
 619
 620 static void
 621 wprobe_socket_dev_free(struct wprobe_iface *dev)
 622 {
 623         if (dev->sockfd >= 0)
 624                 close(dev->sockfd);
 625 }
 626
 627 static const struct wprobe_iface_ops wprobe_remote_ops = {
 628         .send_msg = wprobe_remote_send_msg,
 629         .free = wprobe_socket_dev_free,
 630 };
 631
 632
 633 #ifndef NO_LOCAL_ACCESS
 634 int
 635 wprobe_server_init(int socket)
 636 {
 637         struct wprobe_init_hdr hdr;
 638         int ret;
 639
 640         ret = wprobe_local_init();
 641         if (ret != 0)
 642                 return ret;
 643
 644         memset(&hdr, 0, sizeof(hdr));
 645         memcpy(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(WPROBE_MAGIC_STR));
 646         hdr.pre.version = 0;
 647         hdr.v0.genl_family = genl_family_get_id(family);
 648         SWAP16(hdr.v0.genl_family);
 649         write(socket, (unsigned char *)&hdr, sizeof(hdr));
 650
 651         return 0;
 652 }
 653
 654 static int
 655 wprobe_server_cb(struct nl_msg *msg, void *arg)
 656 {
 657         int *socket = arg;
 658         int ret;
 659
 660         ret = wprobe_msg_to_network(*socket, msg);
 661         if (ret > 0)
 662                 ret = 0;
 663
 664         return ret;
 665 }
 666
 667
 668 int
 669 wprobe_server_handle(int socket)
 670 {
 671         struct wprobe_msg_hdr mhdr;
 672         struct nl_msg *msg;
 673         int ret;
 674
 675         ret = read(socket, &mhdr, sizeof(mhdr));
 676         if (ret != sizeof(mhdr)) {
 677                 if (ret <= 0)
 678                         return -1;
 679
 680                 DPRINTF("Failed to read request header\n");
 681                 return -EINVAL;
 682         }
 683         wprobe_swap_msg_hdr(&mhdr);
 684
 685         switch(mhdr.status) {
 686         case WPROBE_MSG_DATA:
 687                 if (mhdr.len > WPROBE_MAX_MSGLEN) {
 688                         DPRINTF("Invalid length in received response message.\n");
 689                         return -EINVAL;
 690                 }
 691                 msg = wprobe_msg_from_network(socket, mhdr.len);
 692                 break;
 693         default:
 694                 DPRINTF("Invalid request header type\n");
 695                 return -ENOENT;
 696         }
 697
 698         if (!msg) {
 699                 DPRINTF("Failed to get message\n");
 700                 return -EINVAL;
 701         }
 702
 703         ret = wprobe_local_send_msg(NULL, msg, wprobe_server_cb, &socket);
 704
 705         memset(&mhdr, 0, sizeof(mhdr));
 706         mhdr.status = WPROBE_MSG_DONE;
 707         if (ret < 0)
 708                 mhdr.error = (uint16_t) -ret;
 709
 710         ret = write(socket, (unsigned char *)&mhdr, sizeof(mhdr));
 711         if (ret > 0)
 712                 ret = 0;
 713
 714         return ret;
 715 }
 716
 717 void
 718 wprobe_server_done(void)
 719 {
 720         wprobe_local_free(NULL);
 721 }
 722 #endif
 723
 724 struct wprobe_iface *
 725 wprobe_get_from_socket(int socket, const char *name)
 726 {
 727         struct wprobe_iface *dev;
 728         struct wprobe_init_hdr hdr;
 729
 730         dev = wprobe_alloc_dev();
 731         if (!dev)
 732                 goto out;
 733
 734         dev->ops = &wprobe_remote_ops;
 735         dev->sockfd = socket;
 736         dev->ifname = strdup(name);
 737
 738         /* read version and header length */
 739         if (read(socket, &hdr.pre, sizeof(hdr.pre)) != sizeof(hdr.pre)) {
 740                 DPRINTF("Could not read header\n");
 741                 goto error;
 742         }
 743
 744         /* magic not found */
 745         if (memcmp(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(hdr.pre.magic)) != 0) {
 746                 DPRINTF("Magic does not match\n");
 747                 goto error;
 748         }
 749
 750         /* unsupported version */
 751         if (hdr.pre.version != 0) {
 752                 DPRINTF("Protocol version does not match\n");
 753                 goto error;
 754         }
 755
 756         if (read(socket, &hdr.v0, sizeof(hdr.v0)) != sizeof(hdr.v0)) {
 757                 DPRINTF("Could not read header data\n");
 758                 goto error;
 759         }
 760
 761         SWAP16(hdr.pre.extra);
 762         SWAP16(hdr.v0.genl_family);
 763         dev->genl_family = hdr.v0.genl_family;
 764
 765         if (wprobe_init_dev(dev) < 0) {
 766                 DPRINTF("Could not initialize device\n");
 767                 goto error;
 768         }
 769
 770 out:
 771         return dev;
 772
 773 error:
 774         wprobe_free_dev(dev);
 775         return NULL;
 776 }
 777
 778 struct wprobe_iface *
 779 wprobe_get_auto(const char *arg, char **err)
 780 {
 781         static struct sockaddr_in sa;
 782         static char errbuf[512];
 783
 784         struct wprobe_iface *dev = NULL;
 785         struct hostent *h;
 786         char *devstr = strdup(arg);
 787         char *sep = NULL;
 788         int sock = -1;
 789         int len;
 790
 791         if (err)
 792                 *err = NULL;
 793
 794         sep = strchr(devstr, ':');
 795         if (!sep) {
 796 #ifndef NO_LOCAL_ACCESS
 797                 free(devstr);
 798                 return wprobe_get_dev(arg);
 799 #else
 800                 if (err)
 801                         *err = "Invalid argument";
 802                 goto out;
 803 #endif
 804         }
 805
 806         *sep = 0;
 807         sep++;
 808
 809         sock = socket(AF_INET, SOCK_STREAM, 0);
 810         if (sock < 0)
 811                 goto syserr;
 812
 813         h = gethostbyname(devstr);
 814         if (!h) {
 815                 sprintf(errbuf, "Host not found");
 816                 goto out_err;
 817         }
 818
 819         memcpy(&sa.sin_addr, h->h_addr, h->h_length);
 820         sa.sin_family = AF_INET;
 821         sa.sin_port = htons(wprobe_port);
 822         if (connect(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0)
 823                 goto syserr;
 824
 825         dev = wprobe_get_from_socket(sock, sep);
 826         if (!dev) {
 827                 sprintf(errbuf, "wprobe connection initialization failed");
 828                 goto out_err;
 829         }
 830         goto out;
 831
 832 syserr:
 833         if (err) {
 834                 strcpy(errbuf, "Connection failed: ");
 835                 len = strlen(errbuf);
 836                 strerror_r(errno, errbuf + len, sizeof(errbuf) - len - 1);
 837         }
 838 out_err:
 839         if (err)
 840                 *err = errbuf;
 841         if (sock >= 0)
 842                 close(sock);
 843 out:
 844         if (devstr)
 845                 free(devstr);
 846         return dev;
 847 }
 848
 849 static void
 850 free_attr_list(struct list_head *list)
 851 {
 852         struct wprobe_attribute *attr, *tmp;
 853
 854         list_for_each_entry_safe(attr, tmp, list, list) {
 855                 list_del(&attr->list);
 856                 free(attr);
 857         }
 858 }
 859
 860 void
 861 wprobe_free_dev(struct wprobe_iface *dev)
 862 {
 863         if (dev->ops->free)
 864                 dev->ops->free(dev);
 865         free_attr_list(&dev->global_attr);
 866         free_attr_list(&dev->link_attr);
 867         free((void *)dev->ifname);
 868         free(dev);
 869 }
 870
 871 static struct wprobe_link *
 872 get_link(struct list_head *list, const char *addr)
 873 {
 874         struct wprobe_link *l;
 875
 876         list_for_each_entry(l, list, list) {
 877                 if (!memcmp(l->addr, addr, 6)) {
 878                         list_del_init(&l->list);
 879                         goto out;
 880                 }
 881         }
 882
 883         /* no previous link found, allocate a new one */
 884         l = malloc(sizeof(struct wprobe_link));
 885         if (!l)
 886                 goto out;
 887
 888         memset(l, 0, sizeof(struct wprobe_link));
 889         memcpy(l->addr, addr, sizeof(l->addr));
 890         INIT_LIST_HEAD(&l->list);
 891
 892 out:
 893         return l;
 894 }
 895
 896 struct wprobe_save_cb {
 897         struct list_head *list;
 898         struct list_head old_list;
 899 };
 900
 901 static int
 902 save_link_handler(struct nl_msg *msg, void *arg)
 903 {
 904         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 905         struct wprobe_link *link;
 906         struct wprobe_save_cb *cb = arg;
 907         const char *addr;
 908
 909         nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
 910                         genlmsg_attrlen(gnlh, 0), attribute_policy);
 911
 912         if (!tb[WPROBE_ATTR_MAC] || (nla_len(tb[WPROBE_ATTR_MAC]) != 6))
 913                 return -1;
 914
 915         addr = nla_data(tb[WPROBE_ATTR_MAC]);
 916         link = get_link(&cb->old_list, addr);
 917         if (!link)
 918                 return -1;
 919
 920         if (tb[WPROBE_ATTR_FLAGS])
 921                 link->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
 922
 923         list_add_tail(&link->list, cb->list);
 924         return 0;
 925 }
 926
 927
 928 int
 929 wprobe_update_links(struct wprobe_iface *dev)
 930 {
 931         struct wprobe_link *l, *tmp;
 932         struct nl_msg *msg;
 933         struct wprobe_save_cb cb;
 934         int err;
 935
 936         INIT_LIST_HEAD(&cb.old_list);
 937         list_splice_init(&dev->links, &cb.old_list);
 938         cb.list = &dev->links;
 939
 940         msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LINKS, true);
 941         if (!msg)
 942                 return -ENOMEM;
 943
 944         err = dev->ops->send_msg(dev, msg, save_link_handler, &cb);
 945         if (err < 0)
 946                 return err;
 947
 948         list_for_each_entry_safe(l, tmp, &cb.old_list, list) {
 949                 list_del(&l->list);
 950                 free(l);
 951         }
 952
 953         return 0;
 954 }
 955
 956
 957 struct wprobe_filter_data
 958 {
 959         wprobe_filter_cb cb;
 960         void *arg;
 961         struct wprobe_filter_item *buf;
 962         int buflen;
 963 };
 964
 965 static int
 966 dump_filter_handler(struct nl_msg *msg, void *arg)
 967 {
 968         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
 969         struct wprobe_filter_data *data = arg;
 970         struct nlattr *p;
 971         const char *name;
 972         int count = 0;
 973         int len;
 974
 975         nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
 976                         genlmsg_attrlen(gnlh, 0), attribute_policy);
 977
 978         if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_FILTER_GROUP])
 979                 return -1;
 980
 981         name = nla_data(tb[WPROBE_ATTR_NAME]);
 982         nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
 983                 count++;
 984         }
 985
 986         if (data->buflen < count) {
 987                 if (data->buf)
 988                         free(data->buf);
 989                 data->buflen = count;
 990                 data->buf = malloc(sizeof(struct wprobe_filter_item) * count);
 991                 memset(data->buf, 0, sizeof(struct wprobe_filter_item) * count);
 992         }
 993
 994         count = 0;
 995         nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
 996                 struct wprobe_filter_item *fi;
 997
 998                 nla_parse(tb, WPROBE_ATTR_LAST, nla_data(p),
 999                                 nla_len(p), attribute_policy);
1000
1001                 if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_RXCOUNT]
1002                                 || !tb[WPROBE_ATTR_TXCOUNT])
1003                         continue;
1004
1005                 fi = &data->buf[count++];
1006                 strncpy(fi->name, nla_data(tb[WPROBE_ATTR_NAME]), sizeof(fi->name) - 1);
1007                 fi->name[sizeof(fi->name) - 1] = 0;
1008                 fi->rx = nla_get_u64(tb[WPROBE_ATTR_RXCOUNT]);
1009                 fi->tx = nla_get_u64(tb[WPROBE_ATTR_TXCOUNT]);
1010         }
1011         data->cb(data->arg, name, data->buf, count);
1012
1013         return 0;
1014 }
1015
1016 int
1017 wprobe_dump_filters(struct wprobe_iface *dev, wprobe_filter_cb cb, void *arg)
1018 {
1019         struct wprobe_filter_data data;
1020         struct nl_msg *msg;
1021         int err;
1022
1023         data.buf = 0;
1024         data.buflen = 0;
1025         data.cb = cb;
1026         data.arg = arg;
1027
1028         msg = wprobe_new_msg(dev, WPROBE_CMD_GET_FILTER, true);
1029         if (!msg)
1030                 return -ENOMEM;
1031
1032         err = dev->ops->send_msg(dev, msg, dump_filter_handler, &data);
1033         if (err < 0)
1034                 return err;
1035
1036         return 0;
1037 }
1038
1039 int
1040 wprobe_apply_config(struct wprobe_iface *dev)
1041 {
1042         struct nl_msg *msg;
1043
1044         msg = wprobe_new_msg(dev, WPROBE_CMD_CONFIG, false);
1045         if (!msg)
1046                 return -ENOMEM;
1047
1048         if (dev->interval >= 0)
1049                 NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
1050
1051         if (dev->filter_len < 0) {
1052                 NLA_PUT(msg, WPROBE_ATTR_FILTER, 0, NULL);
1053                 dev->filter_len = 0;
1054         } else if (dev->filter && dev->filter_len > 0) {
1055                 NLA_PUT(msg, WPROBE_ATTR_FILTER, dev->filter_len, dev->filter);
1056         }
1057         dev->filter = NULL;
1058
1059         dev->ops->send_msg(dev, msg, NULL, NULL);
1060         return 0;
1061
1062 nla_put_failure:
1063         nlmsg_free(msg);
1064         return -ENOMEM;
1065 }
1066
1067 int
1068 wprobe_measure(struct wprobe_iface *dev)
1069 {
1070         struct nl_msg *msg;
1071
1072         msg = wprobe_new_msg(dev, WPROBE_CMD_MEASURE, false);
1073         if (!msg)
1074                 return -ENOMEM;
1075
1076         dev->ops->send_msg(dev, msg, NULL, NULL);
1077         return 0;
1078 }
1079
1080 struct wprobe_request_cb {
1081         struct list_head *list;
1082         struct list_head old_list;
1083         char *addr;
1084 };
1085
1086 static int
1087 save_attrdata_handler(struct nl_msg *msg, void *arg)
1088 {
1089         struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
1090         struct wprobe_request_cb *cb = arg;
1091         struct wprobe_attribute *attr;
1092         int type, id;
1093
1094         nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
1095                         genlmsg_attrlen(gnlh, 0), attribute_policy);
1096
1097         if (!tb[WPROBE_ATTR_ID])
1098                 return -1;
1099
1100         if (!tb[WPROBE_ATTR_TYPE])
1101                 return -1;
1102
1103         id = nla_get_u32(tb[WPROBE_ATTR_ID]);
1104         list_for_each_entry(attr, &cb->old_list, list) {
1105                 if (attr->id == id)
1106                         goto found;
1107         }
1108         /* not found */
1109         return -1;
1110
1111 found:
1112         list_del_init(&attr->list);
1113
1114         type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
1115         if (type != attr->type) {
1116                 DPRINTF("WARNING: type mismatch for %s attribute '%s' (%d != %d)\n",
1117                         (cb->addr ? "link" : "global"),
1118                         attr->name,
1119                         type, attr->type);
1120                 goto out;
1121         }
1122
1123         if ((type < WPROBE_VAL_STRING) ||
1124                 (type > WPROBE_VAL_U64))
1125                 goto out;
1126
1127         memset(&attr->val, 0, sizeof(attr->val));
1128
1129 #define HANDLE_INT_TYPE(_idx, _type) \
1130         case WPROBE_VAL_S##_type: \
1131         case WPROBE_VAL_U##_type: \
1132                 attr->val.U##_type = nla_get_u##_type(tb[_idx]); \
1133                 break
1134
1135         switch(type) {
1136                 HANDLE_INT_TYPE(type, 8);
1137                 HANDLE_INT_TYPE(type, 16);
1138                 HANDLE_INT_TYPE(type, 32);
1139                 HANDLE_INT_TYPE(type, 64);
1140                 case WPROBE_VAL_STRING:
1141                         /* unimplemented */
1142                         break;
1143         }
1144 #undef HANDLE_TYPE
1145
1146         if (attr->flags & WPROBE_F_KEEPSTAT) {
1147                 if (tb[WPROBE_VAL_SUM])
1148                         attr->val.s = nla_get_u64(tb[WPROBE_VAL_SUM]);
1149
1150                 if (tb[WPROBE_VAL_SUM_SQ])
1151                         attr->val.ss = nla_get_u64(tb[WPROBE_VAL_SUM_SQ]);
1152
1153                 if (tb[WPROBE_VAL_SAMPLES])
1154                         attr->val.n = nla_get_u32(tb[WPROBE_VAL_SAMPLES]);
1155
1156                 if (attr->val.n > 0) {
1157                         float avg = ((float) attr->val.s) / attr->val.n;
1158                         float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
1159                         if (isnan(stdev))
1160                                 stdev = 0.0f;
1161                         if (isnan(avg))
1162                                 avg = 0.0f;
1163                         attr->val.avg = avg;
1164                         attr->val.stdev = stdev;
1165                 }
1166         }
1167
1168 out:
1169         list_add_tail(&attr->list, cb->list);
1170         return 0;
1171 }
1172
1173
1174 int
1175 wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
1176 {
1177         struct wprobe_request_cb cb;
1178         struct list_head *attrs;
1179         struct nl_msg *msg;
1180         int err;
1181
1182         msg = wprobe_new_msg(dev, WPROBE_CMD_GET_INFO, true);
1183         if (!msg)
1184                 return -ENOMEM;
1185
1186         if (addr) {
1187                 attrs = &dev->link_attr;
1188                 NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
1189         } else {
1190                 attrs = &dev->global_attr;
1191         }
1192
1193         INIT_LIST_HEAD(&cb.old_list);
1194         list_splice_init(attrs, &cb.old_list);
1195         cb.list = attrs;
1196
1197         err = dev->ops->send_msg(dev, msg, save_attrdata_handler, &cb);
1198         list_splice(&cb.old_list, attrs->prev);
1199         return err;
1200
1201 nla_put_failure:
1202         nlmsg_free(msg);
1203         return -ENOMEM;
1204 }
1205
1206