capture-wpcap.c

   1 /* capture-wpcap.c
   2  * WinPcap-specific interfaces for capturing.  We load WinPcap at run
   3  * time, so that we only need one Wireshark binary and one TShark binary
   4  * for Windows, regardless of whether WinPcap is installed or not.
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 2001 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 #include "config.h"
  28
  29 #include <stdio.h>
  30 #include <glib.h>
  31 #include <gmodule.h>
  32
  33 #include <epan/strutil.h>
  34
  35 #include "capture_ifinfo.h"
  36 #include "capture-pcap-util.h"
  37 #include "capture-pcap-util-int.h"
  38 #include "capture-wpcap.h"
  39
  40 #include <wsutil/file_util.h>
  41
  42 /* XXX - yes, I know, I should move cppmagic.h to a generic location. */
  43 #include "tools/lemon/cppmagic.h"
  44
  45 #define MAX_WIN_IF_NAME_LEN 511
  46
  47
  48 gboolean has_wpcap = FALSE;
  49
  50 #ifdef HAVE_LIBPCAP
  51
  52 /*
  53  * XXX - should we require at least WinPcap 3.1 both for building an
  54  * for using Wireshark?
  55  */
  56
  57 static char*   (*p_pcap_lookupdev) (char *);
  58 static void    (*p_pcap_close) (pcap_t *);
  59 static int     (*p_pcap_stats) (pcap_t *, struct pcap_stat *);
  60 static int     (*p_pcap_dispatch) (pcap_t *, int, pcap_handler, guchar *);
  61 static int     (*p_pcap_snapshot) (pcap_t *);
  62 static int     (*p_pcap_datalink) (pcap_t *);
  63 static int     (*p_pcap_setfilter) (pcap_t *, struct bpf_program *);
  64 static char*   (*p_pcap_geterr) (pcap_t *);
  65 static int     (*p_pcap_compile) (pcap_t *, struct bpf_program *, const char *, int,
  66                         bpf_u_int32);
  67 static int     (*p_pcap_compile_nopcap) (int, int, struct bpf_program *, const char *, int,
  68                         bpf_u_int32);
  69 static int     (*p_pcap_lookupnet) (const char *, bpf_u_int32 *, bpf_u_int32 *,
  70                         char *);
  71 static pcap_t* (*p_pcap_open_live) (const char *, int, int, int, char *);
  72 static int     (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);
  73 #ifdef HAVE_PCAP_OPEN_DEAD
  74 static pcap_t* (*p_pcap_open_dead) (int, int);
  75 #endif
  76 static void    (*p_pcap_freecode) (struct bpf_program *);
  77 #ifdef HAVE_PCAP_FINDALLDEVS
  78 static int     (*p_pcap_findalldevs) (pcap_if_t **, char *);
  79 static void    (*p_pcap_freealldevs) (pcap_if_t *);
  80 #endif
  81 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
  82 static int (*p_pcap_datalink_name_to_val) (const char *);
  83 #endif
  84 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
  85 static const char *(*p_pcap_datalink_val_to_name) (int);
  86 #endif
  87 #ifdef HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION
  88 static const char *(*p_pcap_datalink_val_to_description) (int);
  89 #endif
  90 #ifdef HAVE_PCAP_BREAKLOOP
  91 static void    (*p_pcap_breakloop) (pcap_t *);
  92 #endif
  93 static const char *(*p_pcap_lib_version) (void);
  94 static int     (*p_pcap_setbuff) (pcap_t *, int dim);
  95 static int     (*p_pcap_next_ex) (pcap_t *, struct pcap_pkthdr **pkt_header, const u_char **pkt_data);
  96 #ifdef HAVE_PCAP_REMOTE
  97 static pcap_t* (*p_pcap_open) (const char *, int, int, int,
  98                                struct pcap_rmtauth *, char *);
  99 static int     (*p_pcap_findalldevs_ex) (char *, struct pcap_rmtauth *,
 100                                          pcap_if_t **, char *);
 101 static int     (*p_pcap_createsrcstr) (char *, int, const char *, const char *,
 102                                        const char *, char *);
 103 #endif
 104 #ifdef HAVE_PCAP_SETSAMPLING
 105 static struct pcap_samp* (*p_pcap_setsampling)(pcap_t *);
 106 #endif
 107
 108 #ifdef HAVE_PCAP_LIST_DATALINKS
 109 static int      (*p_pcap_list_datalinks)(pcap_t *, int **);
 110 #endif
 111
 112 #ifdef HAVE_PCAP_SET_DATALINK
 113 static int      (*p_pcap_set_datalink)(pcap_t *, int);
 114 #endif
 115
 116 #ifdef HAVE_PCAP_FREE_DATALINKS
 117 static int      (*p_pcap_free_datalinks)(int *);
 118 #endif
 119
 120 #ifdef HAVE_BPF_IMAGE
 121 static char     *(*p_bpf_image) (const struct bpf_insn *, int);
 122 #endif
 123
 124 typedef struct {
 125         const char      *name;
 126         gpointer        *ptr;
 127         gboolean        optional;
 128 } symbol_table_t;
 129
 130 #define SYM(x, y)       { G_STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }
 131
 132 void
 133 load_wpcap(void)
 134 {
 135
 136         /* These are the symbols I need or want from Wpcap */
 137         static const symbol_table_t     symbols[] = {
 138                 SYM(pcap_lookupdev, FALSE),
 139                 SYM(pcap_close, FALSE),
 140                 SYM(pcap_stats, FALSE),
 141                 SYM(pcap_dispatch, FALSE),
 142                 SYM(pcap_snapshot, FALSE),
 143                 SYM(pcap_datalink, FALSE),
 144                 SYM(pcap_setfilter, FALSE),
 145                 SYM(pcap_geterr, FALSE),
 146                 SYM(pcap_compile, FALSE),
 147                 SYM(pcap_compile_nopcap, FALSE),
 148                 SYM(pcap_lookupnet, FALSE),
 149 #ifdef HAVE_PCAP_REMOTE
 150                 SYM(pcap_open, FALSE),
 151                 SYM(pcap_findalldevs_ex, FALSE),
 152                 SYM(pcap_createsrcstr, FALSE),
 153 #endif
 154                 SYM(pcap_open_live, FALSE),
 155 #ifdef HAVE_PCAP_OPEN_DEAD
 156                 SYM(pcap_open_dead, FALSE),
 157 #endif
 158 #ifdef HAVE_PCAP_SETSAMPLING
 159                 SYM(pcap_setsampling, TRUE),
 160 #endif
 161                 SYM(pcap_loop, FALSE),
 162                 SYM(pcap_freecode, TRUE),
 163 #ifdef HAVE_PCAP_FINDALLDEVS
 164                 SYM(pcap_findalldevs, TRUE),
 165                 SYM(pcap_freealldevs, TRUE),
 166 #endif
 167 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
 168                 SYM(pcap_datalink_name_to_val, TRUE),
 169 #endif
 170 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
 171                 SYM(pcap_datalink_val_to_name, TRUE),
 172 #endif
 173 #ifdef HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION
 174                 SYM(pcap_datalink_val_to_description, TRUE),
 175 #endif
 176 #ifdef HAVE_PCAP_BREAKLOOP
 177                 /*
 178                  * We don't try to work around the lack of this at
 179                  * run time; it's present in WinPcap 3.1, which is
 180                  * the version we build with and ship with.
 181                  */
 182                 SYM(pcap_breakloop, FALSE),
 183 #endif
 184                 SYM(pcap_lib_version, TRUE),
 185                 SYM(pcap_setbuff, TRUE),
 186                 SYM(pcap_next_ex, TRUE),
 187 #ifdef HAVE_PCAP_LIST_DATALINKS
 188                 SYM(pcap_list_datalinks, FALSE),
 189 #endif
 190 #ifdef HAVE_PCAP_SET_DATALINK
 191                 SYM(pcap_set_datalink, FALSE),
 192 #endif
 193 #ifdef HAVE_PCAP_FREE_DATALINKS
 194                 SYM(pcap_free_datalinks, TRUE),
 195 #endif
 196 #ifdef HAVE_BPF_IMAGE
 197                 SYM(bpf_image, FALSE),
 198 #endif
 199                 { NULL, NULL, FALSE }
 200         };
 201
 202         GModule         *wh; /* wpcap handle */
 203         const symbol_table_t    *sym;
 204
 205         wh = ws_module_open("wpcap.dll", 0);
 206
 207         if (!wh) {
 208                 return;
 209         }
 210
 211         sym = symbols;
 212         while (sym->name) {
 213                 if (!g_module_symbol(wh, sym->name, sym->ptr)) {
 214                         if (sym->optional) {
 215                                 /*
 216                                  * We don't care if it's missing; we just
 217                                  * don't use it.
 218                                  */
 219                                 *sym->ptr = NULL;
 220                         } else {
 221                                 /*
 222                                  * We require this symbol.
 223                                  */
 224                                 return;
 225                         }
 226                 }
 227                 sym++;
 228         }
 229
 230
 231         has_wpcap = TRUE;
 232 }
 233
 234 /*
 235  * The official list of WinPcap mirrors is at
 236  * http://www.winpcap.org/misc/mirrors.htm
 237  */
 238 char *
 239 cant_load_winpcap_err(const char *app_name)
 240 {
 241         return g_strdup_printf(
 242 "Unable to load WinPcap (wpcap.dll); %s will not be able to capture\n"
 243 "packets.\n"
 244 "\n"
 245 "In order to capture packets, WinPcap must be installed; see\n"
 246 "\n"
 247 "        http://www.winpcap.org/\n"
 248 "\n"
 249 "or the mirror at\n"
 250 "\n"
 251 "        http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"
 252 "\n"
 253 "or the mirror at\n"
 254 "\n"
 255 "        http://winpcap.cs.pu.edu.tw/\n"
 256 "\n"
 257 "for a downloadable version of WinPcap and for instructions on how to install\n"
 258 "WinPcap.",
 259             app_name);
 260 }
 261
 262 char*
 263 pcap_lookupdev (char *a)
 264 {
 265         if (!has_wpcap) {
 266                 return NULL;
 267         }
 268         return p_pcap_lookupdev(a);
 269 }
 270
 271 void
 272 pcap_close(pcap_t *a)
 273 {
 274         g_assert(has_wpcap);
 275         p_pcap_close(a);
 276 }
 277
 278 int
 279 pcap_stats(pcap_t *a, struct pcap_stat *b)
 280 {
 281         g_assert(has_wpcap);
 282         return p_pcap_stats(a, b);
 283 }
 284
 285 int
 286 pcap_dispatch(pcap_t *a, int b, pcap_handler c, guchar *d)
 287 {
 288         g_assert(has_wpcap);
 289         return p_pcap_dispatch(a, b, c, d);
 290 }
 291
 292 int
 293 pcap_snapshot(pcap_t *a)
 294 {
 295         g_assert(has_wpcap);
 296         return p_pcap_snapshot(a);
 297 }
 298
 299 int
 300 pcap_datalink(pcap_t *a)
 301 {
 302         g_assert(has_wpcap);
 303         return p_pcap_datalink(a);
 304 }
 305
 306 #ifdef HAVE_PCAP_SET_DATALINK
 307 int
 308 pcap_set_datalink(pcap_t *p, int dlt)
 309 {
 310         g_assert(has_wpcap);
 311         return p_pcap_set_datalink(p, dlt);
 312 }
 313 #endif
 314
 315 int
 316 pcap_setfilter(pcap_t *a, struct bpf_program *b)
 317 {
 318         g_assert(has_wpcap);
 319         return p_pcap_setfilter(a, b);
 320 }
 321
 322 char*
 323 pcap_geterr(pcap_t *a)
 324 {
 325         g_assert(has_wpcap);
 326         return p_pcap_geterr(a);
 327 }
 328
 329 int
 330 pcap_compile(pcap_t *a, struct bpf_program *b, const char *c, int d,
 331             bpf_u_int32 e)
 332 {
 333         g_assert(has_wpcap);
 334         return p_pcap_compile(a, b, c, d, e);
 335 }
 336
 337 int
 338 pcap_compile_nopcap(int a, int b, struct bpf_program *c, const char *d, int e,
 339             bpf_u_int32 f)
 340 {
 341         g_assert(has_wpcap);
 342         return p_pcap_compile_nopcap(a, b, c, d, e, f);
 343 }
 344
 345 int
 346 pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
 347 {
 348         g_assert(has_wpcap);
 349         return p_pcap_lookupnet(a, b, c, d);
 350 }
 351
 352 pcap_t*
 353 pcap_open_live(const char *a, int b, int c, int d, char *e)
 354 {
 355     if (!has_wpcap) {
 356         g_snprintf(e, PCAP_ERRBUF_SIZE,
 357                    "unable to load WinPcap (wpcap.dll); can't open %s to capture",
 358                    a);
 359         return NULL;
 360     }
 361     return p_pcap_open_live(a, b, c, d, e);
 362 }
 363
 364 #ifdef HAVE_PCAP_OPEN_DEAD
 365 pcap_t*
 366 pcap_open_dead(int a, int b)
 367 {
 368     if (!has_wpcap) {
 369         return NULL;
 370     }
 371     return p_pcap_open_dead(a, b);
 372 }
 373 #endif
 374
 375 #ifdef HAVE_BPF_IMAGE
 376 char *
 377 bpf_image(const struct bpf_insn *a, int b)
 378 {
 379     if (!has_wpcap) {
 380         return NULL;
 381     }
 382     return p_bpf_image(a, b);
 383 }
 384 #endif
 385
 386 #ifdef HAVE_PCAP_REMOTE
 387 pcap_t*
 388 pcap_open(const char *a, int b, int c, int d, struct pcap_rmtauth *e, char *f)
 389 {
 390     if (!has_wpcap) {
 391         g_snprintf(f, PCAP_ERRBUF_SIZE,
 392                    "unable to load WinPcap (wpcap.dll); can't open %s to capture",
 393                    a);
 394         return NULL;
 395     }
 396     return p_pcap_open(a, b, c, d, e, f);
 397 }
 398
 399 int
 400 pcap_findalldevs_ex(char *a, struct pcap_rmtauth *b, pcap_if_t **c, char *d)
 401 {
 402     g_assert(has_wpcap);
 403     return p_pcap_findalldevs_ex(a, b, c, d);
 404 }
 405
 406 int
 407 pcap_createsrcstr(char *a, int b, const char *c, const char *d, const char *e,
 408                   char *f)
 409 {
 410     g_assert(has_wpcap);
 411     return p_pcap_createsrcstr(a, b, c, d, e, f);
 412 }
 413 #endif
 414
 415 #ifdef HAVE_PCAP_SETSAMPLING
 416 struct pcap_samp *
 417 pcap_setsampling(pcap_t *a)
 418 {
 419     g_assert(has_wpcap);
 420     if (p_pcap_setsampling != NULL) {
 421         return p_pcap_setsampling(a);
 422     }
 423     return NULL;
 424 }
 425 #endif
 426
 427 int
 428 pcap_loop(pcap_t *a, int b, pcap_handler c, guchar *d)
 429 {
 430         g_assert(has_wpcap);
 431         return p_pcap_loop(a, b, c, d);
 432 }
 433
 434 void
 435 pcap_freecode(struct bpf_program *a)
 436 {
 437         g_assert(has_wpcap);
 438     if(p_pcap_freecode) {
 439             p_pcap_freecode(a);
 440     }
 441 }
 442
 443 #ifdef HAVE_PCAP_FINDALLDEVS
 444 int
 445 pcap_findalldevs(pcap_if_t **a, char *b)
 446 {
 447         g_assert(has_wpcap && p_pcap_findalldevs != NULL);
 448         return p_pcap_findalldevs(a, b);
 449 }
 450
 451 void
 452 pcap_freealldevs(pcap_if_t *a)
 453 {
 454         g_assert(has_wpcap && p_pcap_freealldevs != NULL);
 455         p_pcap_freealldevs(a);
 456 }
 457 #endif
 458
 459 #if defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
 460 /*
 461  * Table of DLT_ types, names, and descriptions, for use if the version
 462  * of WinPcap we have installed lacks "pcap_datalink_name_to_val()"
 463  * or "pcap_datalink_val_to_name()".
 464  */
 465 struct dlt_choice {
 466         const char *name;
 467         const char *description;
 468         int     dlt;
 469 };
 470
 471 #define DLT_CHOICE(code, description) { #code, description, code }
 472 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
 473
 474 static struct dlt_choice dlt_choices[] = {
 475         DLT_CHOICE(DLT_NULL, "BSD loopback"),
 476         DLT_CHOICE(DLT_EN10MB, "Ethernet"),
 477         DLT_CHOICE(DLT_IEEE802, "Token ring"),
 478         DLT_CHOICE(DLT_ARCNET, "ARCNET"),
 479         DLT_CHOICE(DLT_SLIP, "SLIP"),
 480         DLT_CHOICE(DLT_PPP, "PPP"),
 481         DLT_CHOICE(DLT_FDDI, "FDDI"),
 482         DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
 483         DLT_CHOICE(DLT_RAW, "Raw IP"),
 484 #ifdef DLT_SLIP_BSDOS
 485         DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
 486 #endif
 487 #ifdef DLT_PPP_BSDOS
 488         DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
 489 #endif
 490 #ifdef DLT_ATM_CLIP
 491         DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
 492 #endif
 493 #ifdef DLT_PPP_SERIAL
 494         DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
 495 #endif
 496 #ifdef DLT_PPP_ETHER
 497         DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
 498 #endif
 499 #ifdef DLT_C_HDLC
 500         DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
 501 #endif
 502 #ifdef DLT_IEEE802_11
 503         DLT_CHOICE(DLT_IEEE802_11, "802.11"),
 504 #endif
 505 #ifdef DLT_FRELAY
 506         DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
 507 #endif
 508 #ifdef DLT_LOOP
 509         DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
 510 #endif
 511 #ifdef DLT_ENC
 512         DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
 513 #endif
 514 #ifdef DLT_LINUX_SLL
 515         DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
 516 #endif
 517 #ifdef DLT_LTALK
 518         DLT_CHOICE(DLT_LTALK, "Localtalk"),
 519 #endif
 520 #ifdef DLT_PFLOG
 521         DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
 522 #endif
 523 #ifdef DLT_PRISM_HEADER
 524         DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
 525 #endif
 526 #ifdef DLT_IP_OVER_FC
 527         DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
 528 #endif
 529 #ifdef DLT_SUNATM
 530         DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
 531 #endif
 532 #ifdef DLT_IEEE802_11_RADIO
 533         DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radio information header"),
 534 #endif
 535 #ifdef DLT_ARCNET_LINUX
 536         DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
 537 #endif
 538 #ifdef DLT_LINUX_IRDA
 539         DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
 540 #endif
 541 #ifdef DLT_LINUX_LAPD
 542         DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
 543 #endif
 544 #ifdef DLT_LANE8023
 545         DLT_CHOICE(DLT_LANE8023, "Linux 802.3 LANE"),
 546 #endif
 547 #ifdef DLT_CIP
 548         DLT_CHOICE(DLT_CIP, "Linux Classical IP-over-ATM"),
 549 #endif
 550 #ifdef DLT_HDLC
 551         DLT_CHOICE(DLT_HDLC, "Cisco HDLC"),
 552 #endif
 553 #ifdef DLT_PPI
 554         DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
 555 #endif
 556         DLT_CHOICE_SENTINEL
 557 };
 558 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION */
 559
 560 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
 561 int
 562 pcap_datalink_name_to_val(const char *name)
 563 {
 564         int i;
 565
 566         g_assert(has_wpcap);
 567
 568         if (p_pcap_datalink_name_to_val != NULL)
 569                 return p_pcap_datalink_name_to_val(name);
 570         else {
 571                 /*
 572                  * We don't have it in WinPcap; do it ourselves.
 573                  */
 574                 for (i = 0; dlt_choices[i].name != NULL; i++) {
 575                         if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
 576                             name) == 0)
 577                                 return dlt_choices[i].dlt;
 578                 }
 579                 return -1;
 580         }
 581 }
 582 #endif
 583
 584 #ifdef HAVE_PCAP_LIST_DATALINKS
 585 int
 586 pcap_list_datalinks(pcap_t *p, int **ddlt)
 587 {
 588         g_assert(has_wpcap);
 589         return p_pcap_list_datalinks(p, ddlt);
 590 }
 591 #endif
 592
 593 #ifdef HAVE_PCAP_FREE_DATALINKS
 594 void
 595 pcap_free_datalinks(int *ddlt)
 596 {
 597         g_assert(has_wpcap);
 598
 599         /*
 600          * If we don't have pcap_free_datalinks() in WinPcap,
 601          * we don't free the memory - we can't use free(), as
 602          * we might not have been built with the same version
 603          * of the C runtime library as WinPcap was, and, if we're
 604          * not, free() isn't guaranteed to work on something
 605          * allocated by WinPcap.
 606          */
 607         if (p_pcap_free_datalinks != NULL)
 608                 p_pcap_free_datalinks(ddlt);
 609 }
 610 #endif
 611
 612 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
 613 const char *
 614 pcap_datalink_val_to_name(int dlt)
 615 {
 616         int i;
 617
 618         g_assert(has_wpcap);
 619
 620         if (p_pcap_datalink_val_to_name != NULL)
 621                 return p_pcap_datalink_val_to_name(dlt);
 622         else {
 623                 /*
 624                  * We don't have it in WinPcap; do it ourselves.
 625                  */
 626                 for (i = 0; dlt_choices[i].name != NULL; i++) {
 627                         if (dlt_choices[i].dlt == dlt)
 628                                 return dlt_choices[i].name + sizeof("DLT_") - 1;
 629                 }
 630                 return NULL;
 631         }
 632 }
 633 #endif
 634
 635 #ifdef HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION
 636 const char *
 637 pcap_datalink_val_to_description(int dlt)
 638 {
 639         int i;
 640
 641         g_assert(has_wpcap);
 642
 643         if (p_pcap_datalink_val_to_description != NULL)
 644                 return p_pcap_datalink_val_to_description(dlt);
 645         else {
 646                 /*
 647                  * We don't have it in WinPcap; do it ourselves.
 648                  */
 649                 for (i = 0; dlt_choices[i].name != NULL; i++) {
 650                         if (dlt_choices[i].dlt == dlt)
 651                                 return (dlt_choices[i].description);
 652                 }
 653                 return NULL;
 654         }
 655 }
 656 #endif
 657
 658 #ifdef HAVE_PCAP_BREAKLOOP
 659 void pcap_breakloop(pcap_t *a)
 660 {
 661         p_pcap_breakloop(a);
 662 }
 663 #endif
 664
 665 /* setbuff is win32 specific! */
 666 int pcap_setbuff(pcap_t *a, int b)
 667 {
 668         g_assert(has_wpcap);
 669         return p_pcap_setbuff(a, b);
 670 }
 671
 672 /* pcap_next_ex is available since libpcap 0.8 / WinPcap 3.0! */
 673 /* (if you get a declaration warning here, try to update to at least WinPcap 3.1b4 develpack) */
 674 int pcap_next_ex (pcap_t *a, struct pcap_pkthdr **b, const u_char **c)
 675 {
 676         g_assert(has_wpcap);
 677         return p_pcap_next_ex(a, b, c);
 678 }
 679
 680 #ifdef HAVE_PCAP_REMOTE
 681 GList *
 682 get_remote_interface_list(const char *hostname, const char *port,
 683                           int auth_type, const char *username,
 684                           const char *passwd, int *err, char **err_str)
 685 {
 686     struct pcap_rmtauth auth;
 687     char source[PCAP_BUF_SIZE];
 688     char errbuf[PCAP_ERRBUF_SIZE];
 689     GList *result;
 690
 691     if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
 692                           NULL, errbuf) == -1) {
 693         *err = CANT_GET_INTERFACE_LIST;
 694         if (err_str != NULL)
 695             *err_str = cant_get_if_list_error_message(errbuf);
 696         return NULL;
 697     }
 698
 699     auth.type = auth_type;
 700     auth.username = g_strdup(username);
 701     auth.password = g_strdup(passwd);
 702
 703     result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
 704     g_free(auth.username);
 705     g_free(auth.password);
 706
 707     return result;
 708 }
 709 #endif
 710
 711 /*
 712  * This will use "pcap_findalldevs()" if we have it, otherwise it'll
 713  * fall back on "pcap_lookupdev()".
 714  */
 715 GList *
 716 get_interface_list(int *err, char **err_str)
 717 {
 718         GList  *il = NULL;
 719         wchar_t *names;
 720         char *win95names;
 721         char ascii_name[MAX_WIN_IF_NAME_LEN + 1];
 722         char ascii_desc[MAX_WIN_IF_NAME_LEN + 1];
 723         int i, j;
 724         char errbuf[PCAP_ERRBUF_SIZE];
 725
 726         if (!has_wpcap) {
 727                 /*
 728                  * We don't have WinPcap, so we can't get a list of
 729                  * interfaces.
 730                  */
 731                 *err = DONT_HAVE_PCAP;
 732                 *err_str = cant_load_winpcap_err("you");
 733                 return NULL;
 734         }
 735
 736 #ifdef HAVE_PCAP_FINDALLDEVS
 737         if (p_pcap_findalldevs != NULL)
 738                 return get_interface_list_findalldevs(err, err_str);
 739 #endif
 740
 741         /*
 742          * In WinPcap, pcap_lookupdev is implemented by calling
 743          * PacketGetAdapterNames.  According to the documentation
 744          * I could find:
 745          *
 746          *      http://www.winpcap.org/docs/man/html/Packet32_8c.html#a43
 747          *
 748          * this means that:
 749          *
 750          * On Windows OT (95, 98, Me), pcap_lookupdev returns a sequence
 751          * of bytes consisting of:
 752          *
 753          *      a sequence of null-terminated ASCII strings (i.e., each
 754          *      one is terminated by a single 0 byte), giving the names
 755          *      of the interfaces;
 756          *
 757          *      an empty ASCII string (i.e., a single 0 byte);
 758          *
 759          *      a sequence of null-terminated ASCII strings, giving the
 760          *      descriptions of the interfaces;
 761          *
 762          *      an empty ASCII string.
 763          *
 764          * On Windows NT (NT 4.0, W2K, WXP, W2K3, etc.), pcap_lookupdev
 765          * returns a sequence of bytes consisting of:
 766          *
 767          *      a sequence of null-terminated double-byte Unicode strings
 768          *      (i.e., each one consits of a sequence of double-byte
 769          *      characters, terminated by a double-byte 0), giving the
 770          *      names of the interfaces;
 771          *
 772          *      an empty Unicode string (i.e., a double 0 byte);
 773          *
 774          *      a sequence of null-terminated ASCII strings, giving the
 775          *      descriptions of the interfaces;
 776          *
 777          *      an empty ASCII string.
 778          *
 779          * The Nth string in the first sequence is the name of the Nth
 780          * adapter; the Nth string in the second sequence is the
 781          * description of the Nth adapter.
 782          */
 783
 784         names = (wchar_t *)pcap_lookupdev(errbuf);
 785         i = 0;
 786
 787         if (names) {
 788                 char* desc = 0;
 789                 int desc_pos = 0;
 790
 791                 if (names[0]<256) {
 792                         /*
 793                          * If names[0] is less than 256 it means the first
 794                          * byte is 0.  This implies that we are using Unicode
 795                          * characters.
 796                          */
 797                         while (*(names+desc_pos) || *(names+desc_pos-1))
 798                                 desc_pos++;
 799                         desc_pos++;     /* Step over the extra '\0' */
 800                         desc = (char*)(names + desc_pos); /* cast *after* addition */
 801
 802                         while (names[i] != 0) {
 803                                 /*
 804                                  * Copy the Unicode description to an ASCII
 805                                  * string.
 806                                  */
 807                                 j = 0;
 808                                 while (*desc != 0) {
 809                                         if (j < MAX_WIN_IF_NAME_LEN)
 810                                                 ascii_desc[j++] = *desc;
 811                                         desc++;
 812                                 }
 813                                 ascii_desc[j] = '\0';
 814                                 desc++;
 815
 816                                 /*
 817                                  * Copy the Unicode name to an ASCII string.
 818                                  */
 819                                 j = 0;
 820                                 while (names[i] != 0) {
 821                                         if (j < MAX_WIN_IF_NAME_LEN)
 822                                                 ascii_name[j++] = (char) names[i++];
 823                                 }
 824                                 ascii_name[j] = '\0';
 825                                 i++;
 826                                 il = g_list_append(il,
 827                                     if_info_new(ascii_name, ascii_desc, FALSE));
 828                         }
 829                 } else {
 830                         /*
 831                          * Otherwise we are in Windows 95/98 and using ASCII
 832                          * (8-bit) characters.
 833                          */
 834                         win95names=(char *)names;
 835                         while (*(win95names+desc_pos) || *(win95names+desc_pos-1))
 836                                 desc_pos++;
 837                         desc_pos++;     /* Step over the extra '\0' */
 838                         desc = win95names + desc_pos;
 839
 840                         while (win95names[i] != '\0') {
 841                                 /*
 842                                  * "&win95names[i]" points to the current
 843                                  * interface name, and "desc" points to
 844                                  * that interface's description.
 845                                  */
 846                                 il = g_list_append(il,
 847                                     if_info_new(&win95names[i], desc, FALSE));
 848
 849                                 /*
 850                                  * Skip to the next description.
 851                                  */
 852                                 while (*desc != 0)
 853                                         desc++;
 854                                 desc++;
 855
 856                                 /*
 857                                  * Skip to the next name.
 858                                  */
 859                                 while (win95names[i] != 0)
 860                                         i++;
 861                                 i++;
 862                         }
 863                 }
 864         }
 865
 866         if (il == NULL) {
 867                 /*
 868                  * No interfaces found.
 869                  */
 870                 *err = NO_INTERFACES_FOUND;
 871                 if (err_str != NULL)
 872                         *err_str = NULL;
 873         }
 874
 875         return il;
 876 }
 877
 878 /*
 879  * Get an error message string for a CANT_GET_INTERFACE_LIST error from
 880  * "get_interface_list()".
 881  */
 882 gchar *
 883 cant_get_if_list_error_message(const char *err_str)
 884 {
 885         /*
 886          * If the error message includes "Not enough storage is available
 887          * to process this command" or "The operation completed successfully",
 888          * suggest that they install a WinPcap version later than 3.0.
 889          */
 890         if (strstr(err_str, "Not enough storage is available to process this command") != NULL ||
 891             strstr(err_str, "The operation completed successfully") != NULL) {
 892                 return g_strdup_printf("Can't get list of interfaces: %s\n"
 893 "This might be a problem with WinPcap 3.0; you should try updating to\n"
 894 "a later version of WinPcap - see the WinPcap site at www.winpcap.org",
 895                     err_str);
 896         }
 897         return g_strdup_printf("Can't get list of interfaces: %s", err_str);
 898 }
 899
 900 /*
 901  * Append the version of WinPcap with which we were compiled to a GString.
 902  */
 903 void
 904 get_compiled_pcap_version(GString *str)
 905 {
 906         g_string_append(str, "with WinPcap (" G_STRINGIFY(PCAP_VERSION) ")");
 907 }
 908
 909 /*
 910  * Append the version of WinPcap with which we we're running to a GString.
 911  */
 912 void
 913 get_runtime_pcap_version(GString *str)
 914 {
 915         /*
 916          * On Windows, we might have been compiled with WinPcap but
 917          * might not have it loaded; indicate whether we have it or
 918          * not and, if we have it and we have "pcap_lib_version()",
 919          * what version we have.
 920          */
 921         GModule *handle;                /* handle returned by ws_module_open */
 922         static gchar *packetVer;
 923         gchar *blankp;
 924
 925         if (has_wpcap) {
 926                 g_string_append_printf(str, "with ");
 927                 if (p_pcap_lib_version != NULL)
 928                         g_string_append_printf(str, p_pcap_lib_version());
 929                 else {
 930                         /*
 931                          * An alternative method of obtaining the version
 932                          * number, by using the PacketLibraryVersion
 933                          * string from packet.dll.
 934                          *
 935                          * Unfortunately, in WinPcap 3.0, it returns
 936                          * "3.0 alpha3", even in the final version of
 937                          * WinPcap 3.0, so if there's a blank in the
 938                          * string, we strip it and everything after
 939                          * it from the string, so we don't misleadingly
 940                          * report that 3.0 alpha3 is being used when
 941                          * the final version is being used.
 942                          */
 943                         if (packetVer == NULL) {
 944                                 packetVer = "version unknown";
 945                                 handle = ws_module_open("packet.dll", 0);
 946                                 if (handle != NULL) {
 947                                         if (g_module_symbol(handle,
 948                                             "PacketLibraryVersion",
 949                                             (gpointer*)&packetVer)) {
 950                                                 packetVer = g_strdup(packetVer);
 951                                                 blankp = strchr(packetVer, ' ');
 952                                                 if (blankp != NULL)
 953                                                         *blankp = '\0';
 954                                         } else {
 955                                                 packetVer = "version unknown";
 956                                         }
 957                                         g_module_close(handle);
 958                                 }
 959                         }
 960                         g_string_append_printf(str, "WinPcap (%s)", packetVer);
 961                 }
 962         } else
 963                 g_string_append(str, "without WinPcap");
 964 }
 965
 966 #else /* HAVE_LIBPCAP */
 967
 968 void
 969 load_wpcap(void)
 970 {
 971         return;
 972 }
 973
 974 /*
 975  * Append an indication that we were not compiled with WinPcap
 976  * to a GString.
 977  */
 978 void
 979 get_compiled_pcap_version(GString *str)
 980 {
 981         g_string_append(str, "without WinPcap");
 982 }
 983
 984 /*
 985  * Don't append anything, as we weren't even compiled to use WinPcap.
 986  */
 987 void
 988 get_runtime_pcap_version(GString *str _U_)
 989 {
 990 }
 991
 992 #endif /* HAVE_LIBPCAP */