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         CFRelease(name_CFString);
 185 }
 186 #elif defined(__linux__)
 187 /*
 188  * Linux doesn't offer any form of "friendly name", but you can
 189  * determine an interface type to some degree.
 190  */
 191 static void
 192 add_unix_interface_ifinfo(if_info_t *if_info, const char *name,
 193     const char *description _U_)
 194 {
 195         char *wireless_path;
 196         ws_statb64 statb;
 197
 198         /*
 199          * Look for /sys/class/net/{device}/wireless.  If it exists,
 200          * it's a wireless interface.
 201          */
 202         wireless_path = g_strdup_printf("/sys/class/net/%s/wireless", name);
 203         if (wireless_path != NULL) {
 204                 if (ws_stat64(wireless_path, &statb) == 0)
 205                         if_info->type = IF_WIRELESS;
 206                 g_free(wireless_path);
 207         }
 208         if (if_info->type == IF_WIRED) {
 209                 /*
 210                  * We still don't know what it is.  Check for
 211                  * Bluetooth and USB devices.
 212                  */
 213                 if (strstr(name, "bluetooth") != NULL) {
 214                         /*
 215                          * XXX - this is for raw Bluetooth capture; what
 216                          * about IP-over-Bluetooth devices?
 217                          */
 218                         if_info->type = IF_BLUETOOTH;
 219                 } else if (strstr(name, "usbmon") != NULL)
 220                         if_info->type = IF_USB;
 221         }
 222 }
 223 #else
 224 /*
 225  * On other UN*Xes, if there is a description, it's a friendly
 226  * name, and there is no vendor description.  ("Other UN*Xes"
 227  * currently means "FreeBSD and OpenBSD".)
 228  */
 229 void
 230 add_unix_interface_ifinfo(if_info_t *if_info, const char *name _U_,
 231     const char *description)
 232 {
 233         if_info->friendly_name = g_strdup(description);
 234 }
 235 #endif
 236
 237 if_info_t *
 238 if_info_new(const char *name, const char *description, gboolean loopback)
 239 {
 240         if_info_t *if_info;
 241 #ifdef _WIN32
 242         const char *guid_text;
 243         GUID guid;
 244 #endif
 245
 246         if_info = (if_info_t *)g_malloc(sizeof (if_info_t));
 247         if_info->name = g_strdup(name);
 248         if_info->friendly_name = NULL;  /* default - unknown */
 249         if_info->vendor_description = NULL;
 250         if_info->type = IF_WIRED;       /* default */
 251 #ifdef _WIN32
 252         /*
 253          * Get the interface type.
 254          *
 255          * Much digging failed to reveal any obvious way to get something
 256          * such as the SNMP MIB-II ifType value for an interface:
 257          *
 258          *    http://www.iana.org/assignments/ianaiftype-mib
 259          *
 260          * by making some NDIS request.  And even if there were such
 261          * a way, there's no guarantee that the ifType reflects an
 262          * interface type that a user would view as correct (for
 263          * example, some systems report Wi-Fi interfaces as
 264          * Ethernet interfaces).
 265          *
 266          * So we look for keywords in the vendor's interface
 267          * description.
 268          */
 269         if (description && (strstr(description, "generic dialup") != NULL ||
 270             strstr(description, "PPP/SLIP") != NULL)) {
 271                 if_info->type = IF_DIALUP;
 272         } else if (description && (strstr(description, "Wireless") != NULL ||
 273             strstr(description,"802.11") != NULL)) {
 274                 if_info->type = IF_WIRELESS;
 275         } else if (description && strstr(description, "AirPcap") != NULL ||
 276             strstr(name, "airpcap") != NULL) {
 277                 if_info->type = IF_AIRPCAP;
 278         } else if (description && strstr(description, "Bluetooth") != NULL ) {
 279                 if_info->type = IF_BLUETOOTH;
 280         } else if (description && strstr(description, "VMware") != NULL) {
 281                 /*
 282                  * Bridge, NAT, or host-only interface on a VMware host.
 283                  *
 284                  * XXX - what about guest interfaces?
 285                  */
 286                 if_info->type = IF_VIRTUAL;
 287         }
 288
 289         /*
 290          * On Windows, the "description" is a vendor description,
 291          * and the friendly name isn't returned by WinPcap.
 292          * Fetch it ourselves.
 293          */
 294
 295         /*
 296          * Skip over the "\Device\NPF_" prefix in the device name,
 297          * if present.
 298          */
 299         if (strncmp("\\Device\\NPF_", name, 12) == 0)
 300                 guid_text = name + 12;
 301         else
 302                 guid_text = name;
 303
 304         /* Now try to parse what remains as a GUID. */
 305         if (parse_as_guid(guid_text, &guid)) {
 306                 /*
 307                  * Success. Try to get a friendly name using the GUID.
 308                  * As this is a regular interface, the description is a
 309                  * vendor description.
 310                  */
 311                 if_info->friendly_name = get_interface_friendly_name_from_device_guid(&guid);
 312                 if_info->vendor_description = g_strdup(description);
 313         } else {
 314                 /*
 315                  * This is probably not a regular interface; we only
 316                  * support NT 5 (W2K) and later, so all regular interfaces
 317                  * should have GUIDs at the end of the name.  Therefore,
 318                  * the description, if supplied, is a friendly name
 319                  * provided by WinPcap, and there is no vendor
 320                  * description.
 321                  */
 322                 if_info->friendly_name = g_strdup(description);
 323                 if_info->vendor_description = NULL;
 324         }
 325 #else
 326         /*
 327          * On UN*X, if there is a description, it's a friendly
 328          * name, and there is no vendor description.
 329          *
 330          * Try the platform's way of getting a friendly name and
 331          * interface type first.
 332          *
 333          * If that fails, then, for a loopback interface, give it the
 334          * friendly name "Loopback" and, for VMware interfaces,
 335          * give them the type IF_VIRTUAL.
 336          */
 337         add_unix_interface_ifinfo(if_info, name, description);
 338         if (if_info->type == IF_WIRED) {
 339                 /*
 340                  * This is the default interface type.
 341                  *
 342                  * Bridge, NAT, or host-only interfaces on VMWare hosts
 343                  * have the name vmnet[0-9]+. Guests might use a native
 344                  * (LANCE or E1000) driver or the vmxnet driver.  Check
 345                  * the name.
 346                  */
 347                 if (g_ascii_strncasecmp(name, "vmnet", 5) == 0)
 348                         if_info->type = IF_VIRTUAL;
 349                 else if (g_ascii_strncasecmp(name, "vmxnet", 6) == 0)
 350                         if_info->type = IF_VIRTUAL;
 351         }
 352         if (if_info->friendly_name == NULL) {
 353                 /*
 354                  * We couldn't get interface information using platform-
 355                  * dependent calls.
 356                  *
 357                  * If this is a loopback interface, give it a
 358                  * "friendly name" of "Loopback".
 359                  */
 360                 if (loopback)
 361                         if_info->friendly_name = g_strdup("Loopback");
 362         }
 363         if_info->vendor_description = NULL;
 364 #endif
 365         if_info->loopback = loopback;
 366         if_info->addrs = NULL;
 367         return if_info;
 368 }
 369
 370 void
 371 if_info_add_address(if_info_t *if_info, struct sockaddr *addr)
 372 {
 373         if_addr_t *if_addr;
 374         struct sockaddr_in *ai;
 375 #ifdef INET6
 376         struct sockaddr_in6 *ai6;
 377 #endif
 378
 379         switch (addr->sa_family) {
 380
 381         case AF_INET:
 382                 ai = (struct sockaddr_in *)(void *)addr;
 383                 if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
 384                 if_addr->ifat_type = IF_AT_IPv4;
 385                 if_addr->addr.ip4_addr =
 386                     *((guint32 *)&(ai->sin_addr.s_addr));
 387                 if_info->addrs = g_slist_append(if_info->addrs, if_addr);
 388                 break;
 389
 390 #ifdef INET6
 391         case AF_INET6:
 392                 ai6 = (struct sockaddr_in6 *)(void *)addr;
 393                 if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
 394                 if_addr->ifat_type = IF_AT_IPv6;
 395                 memcpy((void *)&if_addr->addr.ip6_addr,
 396                     (void *)&ai6->sin6_addr.s6_addr,
 397                     sizeof if_addr->addr.ip6_addr);
 398                 if_info->addrs = g_slist_append(if_info->addrs, if_addr);
 399                 break;
 400 #endif
 401         }
 402 }
 403
 404 #ifdef HAVE_PCAP_FINDALLDEVS
 405 /*
 406  * Get all IP address information for the given interface.
 407  */
 408 static void
 409 if_info_ip(if_info_t *if_info, pcap_if_t *d)
 410 {
 411         pcap_addr_t *a;
 412
 413         /* All addresses */
 414         for (a = d->addresses; a != NULL; a = a->next) {
 415                 if (a->addr != NULL)
 416                         if_info_add_address(if_info, a->addr);
 417         }
 418 }
 419
 420 #ifdef HAVE_PCAP_REMOTE
 421 GList *
 422 get_interface_list_findalldevs_ex(const char *source,
 423                                   struct pcap_rmtauth *auth,
 424                                   int *err, char **err_str)
 425 {
 426         GList  *il = NULL;
 427         pcap_if_t *alldevs, *dev;
 428         if_info_t *if_info;
 429         char errbuf[PCAP_ERRBUF_SIZE];
 430
 431         if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
 432                 *err = CANT_GET_INTERFACE_LIST;
 433                 if (err_str != NULL)
 434                         *err_str = cant_get_if_list_error_message(errbuf);
 435                 return NULL;
 436         }
 437
 438         if (alldevs == NULL) {
 439                 /*
 440                  * No interfaces found.
 441                  */
 442                 *err = NO_INTERFACES_FOUND;
 443                 if (err_str != NULL)
 444                         *err_str = NULL;
 445                 return NULL;
 446         }
 447
 448         for (dev = alldevs; dev != NULL; dev = dev->next) {
 449                 if_info = if_info_new(dev->name, dev->description,
 450                     (dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
 451                 il = g_list_append(il, if_info);
 452                 if_info_ip(if_info, dev);
 453         }
 454         pcap_freealldevs(alldevs);
 455
 456         return il;
 457 }
 458 #endif
 459
 460 GList *
 461 get_interface_list_findalldevs(int *err, char **err_str)
 462 {
 463         GList  *il = NULL;
 464         pcap_if_t *alldevs, *dev;
 465         if_info_t *if_info;
 466         char errbuf[PCAP_ERRBUF_SIZE];
 467
 468         if (pcap_findalldevs(&alldevs, errbuf) == -1) {
 469                 *err = CANT_GET_INTERFACE_LIST;
 470                 if (err_str != NULL)
 471                         *err_str = cant_get_if_list_error_message(errbuf);
 472                 return NULL;
 473         }
 474
 475         if (alldevs == NULL) {
 476                 /*
 477                  * No interfaces found.
 478                  */
 479                 *err = NO_INTERFACES_FOUND;
 480                 if (err_str != NULL)
 481                         *err_str = NULL;
 482                 return NULL;
 483         }
 484
 485         for (dev = alldevs; dev != NULL; dev = dev->next) {
 486                 if_info = if_info_new(dev->name, dev->description,
 487                     (dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
 488                 il = g_list_append(il, if_info);
 489                 if_info_ip(if_info, dev);
 490         }
 491         pcap_freealldevs(alldevs);
 492
 493         return il;
 494 }
 495 #endif /* HAVE_PCAP_FINDALLDEVS */
 496
 497 static void
 498 free_if_info_addr_cb(gpointer addr, gpointer user_data _U_)
 499 {
 500         g_free(addr);
 501 }
 502
 503 static void
 504 free_if_cb(gpointer data, gpointer user_data _U_)
 505 {
 506         if_info_t *if_info = (if_info_t *)data;
 507
 508         g_free(if_info->name);
 509         g_free(if_info->friendly_name);
 510         g_free(if_info->vendor_description);
 511
 512         g_slist_foreach(if_info->addrs, free_if_info_addr_cb, NULL);
 513         g_slist_free(if_info->addrs);
 514         g_free(if_info);
 515 }
 516
 517 void
 518 free_interface_list(GList *if_list)
 519 {
 520         g_list_foreach(if_list, free_if_cb, NULL);
 521         g_list_free(if_list);
 522 }
 523
 524 #if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
 525 struct dlt_choice {
 526         const char *name;
 527         const char *description;
 528         int     dlt;
 529 };
 530
 531 #define DLT_CHOICE(code, description) { #code, description, code }
 532 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
 533
 534 static struct dlt_choice dlt_choices[] = {
 535         DLT_CHOICE(DLT_NULL, "BSD loopback"),
 536         DLT_CHOICE(DLT_EN10MB, "Ethernet"),
 537         DLT_CHOICE(DLT_IEEE802, "Token ring"),
 538         DLT_CHOICE(DLT_ARCNET, "ARCNET"),
 539         DLT_CHOICE(DLT_SLIP, "SLIP"),
 540         DLT_CHOICE(DLT_PPP, "PPP"),
 541         DLT_CHOICE(DLT_FDDI, "FDDI"),
 542         DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
 543         DLT_CHOICE(DLT_RAW, "Raw IP"),
 544         DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
 545         DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
 546         DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
 547         DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
 548         DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
 549         DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
 550         DLT_CHOICE(DLT_IEEE802_11, "802.11"),
 551         DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
 552         DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
 553         DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
 554         DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
 555         DLT_CHOICE(DLT_LTALK, "Localtalk"),
 556         DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
 557         DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
 558         DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
 559         DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
 560         DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus BSD radio information header"),
 561         DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
 562         DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
 563         DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
 564         DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
 565         DLT_CHOICE_SENTINEL
 566 };
 567
 568 #if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL)
 569 static int
 570 pcap_datalink_name_to_val(const char *name)
 571 {
 572         int i;
 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 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) */
 582
 583 #if !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
 584 static const char *
 585 pcap_datalink_val_to_name(int dlt)
 586 {
 587         int i;
 588
 589         for (i = 0; dlt_choices[i].name != NULL; i++) {
 590                 if (dlt_choices[i].dlt == dlt)
 591                         return (dlt_choices[i].name + sizeof("DLT_") - 1);
 592         }
 593         return (NULL);
 594 }
 595 #endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
 596
 597 #if !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
 598 const char *
 599 pcap_datalink_val_to_description(int dlt)
 600 {
 601         int i;
 602
 603         for (i = 0; dlt_choices[i].name != NULL; i++) {
 604                 if (dlt_choices[i].dlt == dlt)
 605                         return (dlt_choices[i].description);
 606         }
 607         return (NULL);
 608 }
 609 #endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
 610
 611 #endif /* !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
 612
 613 static void
 614 free_linktype_cb(gpointer data, gpointer user_data _U_)
 615 {
 616         data_link_info_t *linktype_info = (data_link_info_t *)data;
 617
 618         g_free(linktype_info->name);
 619         g_free(linktype_info->description);
 620 }
 621
 622 void
 623 free_if_capabilities(if_capabilities_t *caps)
 624 {
 625         g_list_foreach(caps->data_link_types, free_linktype_cb, NULL);
 626         g_list_free(caps->data_link_types);
 627         g_free(caps);
 628 }
 629
 630 const char *
 631 linktype_val_to_name(int dlt)
 632 {
 633     return pcap_datalink_val_to_name(dlt);
 634 }
 635
 636 int linktype_name_to_val(const char *linktype)
 637 {
 638     return pcap_datalink_name_to_val(linktype);
 639 }
 640
 641 #endif /* HAVE_LIBPCAP */