capture-pcap-util.c

   1 /* capture-pcap-util.c
   2  * Utility routines for packet capture
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #ifdef HAVE_LIBPCAP
  28
  29 #include <glib.h>
  30
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <limits.h>
  34 #include <string.h>
  35
  36 #ifdef HAVE_SYS_TYPES_H
  37 # include <sys/types.h>
  38 #endif
  39
  40 #ifdef HAVE_SYS_SOCKET_H
  41 #include <sys/socket.h>
  42 #endif
  43
  44 #include <wtap.h>
  45 #include <libpcap.h>
  46
  47 #include "capture_ifinfo.h"
  48 #include "capture-pcap-util.h"
  49 #include "capture-pcap-util-int.h"
  50
  51 #include "wsutil/file_util.h"
  52
  53 #ifndef _WIN32
  54 #include <netinet/in.h>
  55 #endif
  56
  57 #ifdef _WIN32
  58 #include "capture_win_ifnames.h" /* windows friendly interface names */
  59 #endif
  60
  61 /*
  62  * Given an interface name, find the "friendly name" and interface
  63  * type for the interface.
  64  */
  65
  66 #if defined(__APPLE__)
  67
  68 #include <CoreFoundation/CoreFoundation.h>
  69 #include <SystemConfiguration/SystemConfiguration.h>
  70
  71 #include "cfutils.h"
  72
  73 /*
  74  * On OS X, we get the "friendly name" and interface type for the interface
  75  * from the System Configuration framework.
  76  *
  77  * To find the System Configuration framework information for the
  78  * interface, we get all the interfaces that the System Configuration
  79  * framework knows about and look for the one with a "BSD name" matching
  80  * the interface name.
  81  *
  82  * If we find it, we use its "localized display name", if it has one, as
  83  * the "friendly name".
  84  *
  85  * As for the interface type:
  86  *
  87  * Yes, fetching all the network addresses for an interface gets you an
  88  * AF_LINK address, of type "struct sockaddr_dl", and, yes, that includes
  89  * an SNMP MIB-II ifType value.
  90  *
  91  * However, it's IFT_ETHER, i.e. Ethernet, for AirPort interfaces,
  92  * not IFT_IEEE80211 (which isn't defined in OS X in any case).
  93  *
  94  * Perhaps some other BSD-flavored OSes won't make this mistake;
  95  * however, FreeBSD 7.0 and OpenBSD 4.2, at least, appear to have
  96  * made the same mistake, at least for my Belkin ZyDAS stick.
  97  *
  98  * SCNetworkInterfaceGetInterfaceType() will get the interface
  99  * type.  The interface type is a CFString, and:
 100  *
 101  *    kSCNetworkInterfaceTypeIEEE80211 means IF_WIRELESS;
 102  *    kSCNetworkInterfaceTypeBluetooth means IF_BLUETOOTH;
 103  *    kSCNetworkInterfaceTypeModem or
 104  *    kSCNetworkInterfaceTypePPP or
 105  *    maybe kSCNetworkInterfaceTypeWWAN means IF_DIALUP
 106  */
 107 static void
 108 add_unix_interface_ifinfo(if_info_t *if_info, const char *name,
 109     const char *description _U_)
 110 {
 111         CFStringRef name_CFString;
 112         CFArrayRef interfaces;
 113         CFIndex num_interfaces;
 114         CFIndex i;
 115         SCNetworkInterfaceRef interface;
 116         CFStringRef bsdname_CFString;
 117         CFStringRef friendly_name_CFString;
 118         CFStringRef interface_type_CFString;
 119
 120         interfaces = SCNetworkInterfaceCopyAll();
 121         if (interfaces == NULL) {
 122                 /*
 123                  * Couldn't get a list of interfaces.
 124                  */
 125                 return;
 126         }
 127
 128         name_CFString = CFStringCreateWithCString(kCFAllocatorDefault,
 129             name, kCFStringEncodingUTF8);
 130         if (name_CFString == NULL) {
 131                 /*
 132                  * Couldn't convert the interface name to a CFString.
 133                  */
 134                 CFRelease(interfaces);
 135                 return;
 136         }
 137
 138         num_interfaces = CFArrayGetCount(interfaces);
 139         for (i = 0; i < num_interfaces; i++) {
 140                 interface = (SCNetworkInterfaceRef)CFArrayGetValueAtIndex(interfaces, i);
 141                 bsdname_CFString = SCNetworkInterfaceGetBSDName(interface);
 142                 if (bsdname_CFString == NULL) {
 143                         /*
 144                          * This interface has no BSD name, so it's not
 145                          * a regular network interface.
 146                          */
 147                         continue;
 148                 }
 149                 if (CFStringCompare(name_CFString, bsdname_CFString, 0) == 0) {
 150                         /*
 151                          * This is the interface.
 152                          * First, get the friendly name.
 153                          */
 154                         friendly_name_CFString = SCNetworkInterfaceGetLocalizedDisplayName(interface);
 155                         if (friendly_name_CFString != NULL)
 156                                 if_info->friendly_name = CFString_to_C_string(friendly_name_CFString);
 157
 158                         /*
 159                          * Now get the interface type.
 160                          */
 161                         interface_type_CFString = SCNetworkInterfaceGetInterfaceType(interface);
 162                         if (CFStringCompare(interface_type_CFString,
 163                             kSCNetworkInterfaceTypeIEEE80211, 0) == kCFCompareEqualTo)
 164                                 if_info->type = IF_WIRELESS;
 165                         else if (CFStringCompare(interface_type_CFString,
 166                             kSCNetworkInterfaceTypeBluetooth, 0) == kCFCompareEqualTo)
 167                                 if_info->type = IF_BLUETOOTH;
 168                         else if (CFStringCompare(interface_type_CFString,
 169                             kSCNetworkInterfaceTypeModem, 0) == kCFCompareEqualTo)
 170                                 if_info->type = IF_DIALUP;
 171                         else if (CFStringCompare(interface_type_CFString,
 172                             kSCNetworkInterfaceTypePPP, 0) == kCFCompareEqualTo)
 173                                 if_info->type = IF_DIALUP;
 174                         else if (CFStringCompare(interface_type_CFString,
 175                             kSCNetworkInterfaceTypeWWAN, 0) == kCFCompareEqualTo)
 176                                 if_info->type = IF_DIALUP;
 177                         else
 178                                 if_info->type = IF_WIRED;
 179                         break;
 180                 }
 181         }
 182
 183         CFRelease(interfaces);
 184 }
 185 #elif defined(__linux__)
 186 /*
 187  * Linux doesn't offer any form of "friendly name", but you can
 188  * determine an interface type to some degree.
 189  */
 190 static void
 191 add_unix_interface_ifinfo(if_info_t *if_info, const char *name,
 192     const char *description _U_)
 193 {
 194         char *wireless_path;
 195         ws_statb64 statb;
 196
 197         /*
 198          * Look for /sys/class/net/{device}/wireless.  If it exists,
 199          * it's a wireless interface.
 200          */
 201         wireless_path = g_strdup_printf("/sys/class/net/%s/wireless", name);
 202         if (wireless_path != NULL) {
 203                 if (ws_stat64(wireless_path, &statb) == 0)
 204                         if_info->type = IF_WIRELESS;
 205                 g_free(wireless_path);
 206         }
 207         if (if_info->type == IF_WIRED) {
 208                 /*
 209                  * We still don't know what it is.  Check for
 210                  * Bluetooth and USB devices.
 211                  */
 212                 if (strstr(name, "bluetooth") != NULL) {
 213                         /*
 214                          * XXX - this is for raw Bluetooth capture; what
 215                          * about IP-over-Bluetooth devices?
 216                          */
 217                         if_info->type = IF_BLUETOOTH;
 218                 } else if (strstr(name, "usbmon") != NULL)
 219                         if_info->type = IF_USB;
 220         }
 221 }
 222 #else
 223 /*
 224  * On other UN*Xes, if there is a description, it's a friendly
 225  * name, and there is no vendor description.  ("Other UN*Xes"
 226  * currently means "FreeBSD and OpenBSD".)
 227  */
 228 void
 229 add_unix_interface_ifinfo(if_info_t *if_info, const char *name _U_,
 230     const char *description)
 231 {
 232         if_info->friendly_name = g_strdup(description);
 233 }
 234 #endif
 235
 236 if_info_t *
 237 if_info_new(const char *name, const char *description, gboolean loopback)
 238 {
 239         if_info_t *if_info;
 240 #ifdef _WIN32
 241         const char *guid_text;
 242         GUID guid;
 243 #endif
 244
 245         if_info = (if_info_t *)g_malloc(sizeof (if_info_t));
 246         if_info->name = g_strdup(name);
 247         if_info->friendly_name = NULL;  /* default - unknown */
 248         if_info->vendor_description = NULL;
 249         if_info->type = IF_WIRED;       /* default */
 250 #ifdef _WIN32
 251         /*
 252          * Get the interface type.
 253          *
 254          * Much digging failed to reveal any obvious way to get something
 255          * such as the SNMP MIB-II ifType value for an interface:
 256          *
 257          *    http://www.iana.org/assignments/ianaiftype-mib
 258          *
 259          * by making some NDIS request.  And even if there were such
 260          * a way, there's no guarantee that the ifType reflects an
 261          * interface type that a user would view as correct (for
 262          * example, some systems report Wi-Fi interfaces as
 263          * Ethernet interfaces).
 264          *
 265          * So we look for keywords in the vendor's interface
 266          * description.
 267          */
 268         if (description && (strstr(description, "generic dialup") != NULL ||
 269             strstr(description, "PPP/SLIP") != NULL)) {
 270                 if_info->type = IF_DIALUP;
 271         } else if (description && (strstr(description, "Wireless") != NULL ||
 272             strstr(description,"802.11") != NULL)) {
 273                 if_info->type = IF_WIRELESS;
 274         } else if (description && strstr(description, "AirPcap") != NULL ||
 275             strstr(name, "airpcap") != NULL) {
 276                 if_info->type = IF_AIRPCAP;
 277         } else if (description && strstr(description, "Bluetooth") != NULL ) {
 278                 if_info->type = IF_BLUETOOTH;
 279         } else if (description && strstr(description, "VMware") != NULL) {
 280                 /*
 281                  * Bridge, NAT, or host-only interface on a VMware host.
 282                  *
 283                  * XXX - what about guest interfaces?
 284                  */
 285                 if_info->type = IF_VIRTUAL;
 286         }
 287
 288         /*
 289          * On Windows, the "description" is a vendor description,
 290          * and the friendly name isn't returned by WinPcap.
 291          * Fetch it ourselves.
 292          */
 293
 294         /*
 295          * Skip over the "\Device\NPF_" prefix in the device name,
 296          * if present.
 297          */
 298         if (strncmp("\\Device\\NPF_", name, 12) == 0)
 299                 guid_text = name + 12;
 300         else
 301                 guid_text = name;
 302
 303         /* Now try to parse what remains as a GUID. */
 304         if (parse_as_guid(guid_text, &guid)) {
 305                 /*
 306                  * Success. Try to get a friendly name using the GUID.
 307                  * As this is a regular interface, the description is a
 308                  * vendor description.
 309                  */
 310                 if_info->friendly_name = get_interface_friendly_name_from_device_guid(&guid);
 311                 if_info->vendor_description = g_strdup(description);
 312         } else {
 313                 /*
 314                  * This is probably not a regular interface; we only
 315                  * support NT 5 (W2K) and later, so all regular interfaces
 316                  * should have GUIDs at the end of the name.  Therefore,
 317                  * the description, if supplied, is a friendly name
 318                  * provided by WinPcap, and there is no vendor
 319                  * description.
 320                  */
 321                 if_info->friendly_name = g_strdup(description);
 322                 if_info->vendor_description = NULL;
 323         }
 324 #else
 325         /*
 326          * On UN*X, if there is a description, it's a friendly
 327          * name, and there is no vendor description.
 328          *
 329          * Try the platform's way of getting a friendly name and
 330          * interface type first.
 331          *
 332          * If that fails, then, for a loopback interface, give it the
 333          * friendly name "Loopback" and, for VMware interfaces,
 334          * give them the type IF_VIRTUAL.
 335          */
 336         add_unix_interface_ifinfo(if_info, name, description);
 337         if (if_info->type == IF_WIRED) {
 338                 /*
 339                  * This is the default interface type.
 340                  *
 341                  * Bridge, NAT, or host-only interfaces on VMWare hosts
 342                  * have the name vmnet[0-9]+. Guests might use a native
 343                  * (LANCE or E1000) driver or the vmxnet driver.  Check
 344                  * the name.
 345                  */
 346                 if (g_ascii_strncasecmp(name, "vmnet", 5) == 0)
 347                         if_info->type = IF_VIRTUAL;
 348                 else if (g_ascii_strncasecmp(name, "vmxnet", 6) == 0)
 349                         if_info->type = IF_VIRTUAL;
 350         }
 351         if (if_info->friendly_name == NULL) {
 352                 /*
 353                  * We couldn't get interface information using platform-
 354                  * dependent calls.
 355                  *
 356                  * If this is a loopback interface, give it a
 357                  * "friendly name" of "Loopback".
 358                  */
 359                 if (loopback)
 360                         if_info->friendly_name = g_strdup("Loopback");
 361         }
 362         if_info->vendor_description = NULL;
 363 #endif
 364         if_info->loopback = loopback;
 365         if_info->addrs = NULL;
 366         return if_info;
 367 }
 368
 369 void
 370 if_info_add_address(if_info_t *if_info, struct sockaddr *addr)
 371 {
 372         if_addr_t *if_addr;
 373         struct sockaddr_in *ai;
 374 #ifdef INET6
 375         struct sockaddr_in6 *ai6;
 376 #endif
 377
 378         switch (addr->sa_family) {
 379
 380         case AF_INET:
 381                 ai = (struct sockaddr_in *)(void *)addr;
 382                 if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
 383                 if_addr->ifat_type = IF_AT_IPv4;
 384                 if_addr->addr.ip4_addr =
 385                     *((guint32 *)&(ai->sin_addr.s_addr));
 386                 if_info->addrs = g_slist_append(if_info->addrs, if_addr);
 387                 break;
 388
 389 #ifdef INET6
 390         case AF_INET6:
 391                 ai6 = (struct sockaddr_in6 *)(void *)addr;
 392                 if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
 393                 if_addr->ifat_type = IF_AT_IPv6;
 394                 memcpy((void *)&if_addr->addr.ip6_addr,
 395                     (void *)&ai6->sin6_addr.s6_addr,
 396                     sizeof if_addr->addr.ip6_addr);
 397                 if_info->addrs = g_slist_append(if_info->addrs, if_addr);
 398                 break;
 399 #endif
 400         }
 401 }
 402
 403 #ifdef HAVE_PCAP_FINDALLDEVS
 404 /*
 405  * Get all IP address information for the given interface.
 406  */
 407 static void
 408 if_info_ip(if_info_t *if_info, pcap_if_t *d)
 409 {
 410         pcap_addr_t *a;
 411
 412         /* All addresses */
 413         for (a = d->addresses; a != NULL; a = a->next) {
 414                 if (a->addr != NULL)
 415                         if_info_add_address(if_info, a->addr);
 416         }
 417 }
 418
 419 #ifdef HAVE_PCAP_REMOTE
 420 GList *
 421 get_interface_list_findalldevs_ex(const char *source,
 422                                   struct pcap_rmtauth *auth,
 423                                   int *err, char **err_str)
 424 {
 425         GList  *il = NULL;
 426         pcap_if_t *alldevs, *dev;
 427         if_info_t *if_info;
 428         char errbuf[PCAP_ERRBUF_SIZE];
 429
 430         if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
 431                 *err = CANT_GET_INTERFACE_LIST;
 432                 if (err_str != NULL)
 433                         *err_str = cant_get_if_list_error_message(errbuf);
 434                 return NULL;
 435         }
 436
 437         if (alldevs == NULL) {
 438                 /*
 439                  * No interfaces found.
 440                  */
 441                 *err = NO_INTERFACES_FOUND;
 442                 if (err_str != NULL)
 443                         *err_str = NULL;
 444                 return NULL;
 445         }
 446
 447         for (dev = alldevs; dev != NULL; dev = dev->next) {
 448                 if_info = if_info_new(dev->name, dev->description,
 449                     (dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
 450                 il = g_list_append(il, if_info);
 451                 if_info_ip(if_info, dev);
 452         }
 453         pcap_freealldevs(alldevs);
 454
 455         return il;
 456 }
 457 #endif
 458
 459 GList *
 460 get_interface_list_findalldevs(int *err, char **err_str)
 461 {
 462         GList  *il = NULL;
 463         pcap_if_t *alldevs, *dev;
 464         if_info_t *if_info;
 465         char errbuf[PCAP_ERRBUF_SIZE];
 466
 467         if (pcap_findalldevs(&alldevs, errbuf) == -1) {
 468                 *err = CANT_GET_INTERFACE_LIST;
 469                 if (err_str != NULL)
 470                         *err_str = cant_get_if_list_error_message(errbuf);
 471                 return NULL;
 472         }
 473
 474         if (alldevs == NULL) {
 475                 /*
 476                  * No interfaces found.
 477                  */
 478                 *err = NO_INTERFACES_FOUND;
 479                 if (err_str != NULL)
 480                         *err_str = NULL;
 481                 return NULL;
 482         }
 483
 484         for (dev = alldevs; dev != NULL; dev = dev->next) {
 485                 if_info = if_info_new(dev->name, dev->description,
 486                     (dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
 487                 il = g_list_append(il, if_info);
 488                 if_info_ip(if_info, dev);
 489         }
 490         pcap_freealldevs(alldevs);
 491
 492         return il;
 493 }
 494 #endif /* HAVE_PCAP_FINDALLDEVS */
 495
 496 static void
 497 free_if_info_addr_cb(gpointer addr, gpointer user_data _U_)
 498 {
 499         g_free(addr);
 500 }
 501
 502 static void
 503 free_if_cb(gpointer data, gpointer user_data _U_)
 504 {
 505         if_info_t *if_info = (if_info_t *)data;
 506
 507         g_free(if_info->name);
 508         g_free(if_info->friendly_name);
 509         g_free(if_info->vendor_description);
 510
 511         g_slist_foreach(if_info->addrs, free_if_info_addr_cb, NULL);
 512         g_slist_free(if_info->addrs);
 513         g_free(if_info);
 514 }
 515
 516 void
 517 free_interface_list(GList *if_list)
 518 {
 519         g_list_foreach(if_list, free_if_cb, NULL);
 520         g_list_free(if_list);
 521 }
 522
 523 #if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
 524 struct dlt_choice {
 525         const char *name;
 526         const char *description;
 527         int     dlt;
 528 };
 529
 530 #define DLT_CHOICE(code, description) { #code, description, code }
 531 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
 532
 533 static struct dlt_choice dlt_choices[] = {
 534         DLT_CHOICE(DLT_NULL, "BSD loopback"),
 535         DLT_CHOICE(DLT_EN10MB, "Ethernet"),
 536         DLT_CHOICE(DLT_IEEE802, "Token ring"),
 537         DLT_CHOICE(DLT_ARCNET, "ARCNET"),
 538         DLT_CHOICE(DLT_SLIP, "SLIP"),
 539         DLT_CHOICE(DLT_PPP, "PPP"),
 540         DLT_CHOICE(DLT_FDDI, "FDDI"),
 541         DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
 542         DLT_CHOICE(DLT_RAW, "Raw IP"),
 543         DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
 544         DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
 545         DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
 546         DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
 547         DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
 548         DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
 549         DLT_CHOICE(DLT_IEEE802_11, "802.11"),
 550         DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
 551         DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
 552         DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
 553         DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
 554         DLT_CHOICE(DLT_LTALK, "Localtalk"),
 555         DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
 556         DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
 557         DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
 558         DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
 559         DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus BSD radio information header"),
 560         DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
 561         DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
 562         DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
 563         DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
 564         DLT_CHOICE_SENTINEL
 565 };
 566
 567 #if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL)
 568 static int
 569 pcap_datalink_name_to_val(const char *name)
 570 {
 571         int i;
 572
 573         for (i = 0; dlt_choices[i].name != NULL; i++) {
 574                 if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
 575                     name) == 0)
 576                         return (dlt_choices[i].dlt);
 577         }
 578         return (-1);
 579 }
 580 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) */
 581
 582 #if !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
 583 static const char *
 584 pcap_datalink_val_to_name(int dlt)
 585 {
 586         int i;
 587
 588         for (i = 0; dlt_choices[i].name != NULL; i++) {
 589                 if (dlt_choices[i].dlt == dlt)
 590                         return (dlt_choices[i].name + sizeof("DLT_") - 1);
 591         }
 592         return (NULL);
 593 }
 594 #endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
 595
 596 #if !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
 597 const char *
 598 pcap_datalink_val_to_description(int dlt)
 599 {
 600         int i;
 601
 602         for (i = 0; dlt_choices[i].name != NULL; i++) {
 603                 if (dlt_choices[i].dlt == dlt)
 604                         return (dlt_choices[i].description);
 605         }
 606         return (NULL);
 607 }
 608 #endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
 609
 610 #endif /* !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
 611
 612 static void
 613 free_linktype_cb(gpointer data, gpointer user_data _U_)
 614 {
 615         data_link_info_t *linktype_info = (data_link_info_t *)data;
 616
 617         g_free(linktype_info->name);
 618         g_free(linktype_info->description);
 619 }
 620
 621 void
 622 free_if_capabilities(if_capabilities_t *caps)
 623 {
 624         g_list_foreach(caps->data_link_types, free_linktype_cb, NULL);
 625         g_list_free(caps->data_link_types);
 626         g_free(caps);
 627 }
 628
 629 const char *
 630 linktype_val_to_name(int dlt)
 631 {
 632     return pcap_datalink_val_to_name(dlt);
 633 }
 634
 635 int linktype_name_to_val(const char *linktype)
 636 {
 637     return pcap_datalink_name_to_val(linktype);
 638 }
 639
 640 #endif /* HAVE_LIBPCAP */