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capture-wpcap.c

/* capture-wpcap.c
 * WinPcap-specific interfaces for capturing.  We load WinPcap at run
 * time, so that we only need one Wireshark binary and one TShark binary
 * for Windows, regardless of whether WinPcap is installed or not.
 *
 * $Id: capture-wpcap.c 28065 2009-04-16 04:05:39Z gerald $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 2001 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>
#include <glib.h>
#include <gmodule.h>

#ifdef HAVE_LIBPCAP
#include <pcap.h>
#endif

#include "capture-pcap-util.h"
#include "capture-pcap-util-int.h"

/* XXX - yes, I know, I should move cppmagic.h to a generic location. */
#include "tools/lemon/cppmagic.h"

#define MAX_WIN_IF_NAME_LEN 511


gboolean has_wpcap = FALSE;

#ifdef HAVE_LIBPCAP

/*
 * XXX - should we require at least WinPcap 3.1 both for building an
 * for using Wireshark?
 */

static char*   (*p_pcap_lookupdev) (char *);
static void    (*p_pcap_close) (pcap_t *);
static int     (*p_pcap_stats) (pcap_t *, struct pcap_stat *);
static int     (*p_pcap_dispatch) (pcap_t *, int, pcap_handler, guchar *);
static int     (*p_pcap_snapshot) (pcap_t *);
static int     (*p_pcap_datalink) (pcap_t *);
static int     (*p_pcap_setfilter) (pcap_t *, struct bpf_program *);
static char*   (*p_pcap_geterr) (pcap_t *);
static int     (*p_pcap_compile) (pcap_t *, struct bpf_program *, const char *, int,
                  bpf_u_int32);
#ifdef WPCAP_CONSTIFIED
static int     (*p_pcap_lookupnet) (const char *, bpf_u_int32 *, bpf_u_int32 *,
                  char *);
static pcap_t* (*p_pcap_open_live) (const char *, int, int, int, char *);
#else
static int     (*p_pcap_lookupnet) (char *, bpf_u_int32 *, bpf_u_int32 *,
                  char *);
static pcap_t* (*p_pcap_open_live) (char *, int, int, int, char *);
#endif
static int     (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);
static void    (*p_pcap_freecode) (struct bpf_program *);
#ifdef HAVE_PCAP_FINDALLDEVS
static int     (*p_pcap_findalldevs) (pcap_if_t **, char *);
static void    (*p_pcap_freealldevs) (pcap_if_t *);
#endif
#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
static int (*p_pcap_datalink_name_to_val) (const char *);
#endif
#ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
static const char *(*p_pcap_datalink_val_to_name) (int);
#endif
#ifdef HAVE_PCAP_BREAKLOOP
static void    (*p_pcap_breakloop) (pcap_t *);
#endif
static const char *(*p_pcap_lib_version) (void);
static int     (*p_pcap_setbuff) (pcap_t *, int dim);
static int     (*p_pcap_next_ex) (pcap_t *, struct pcap_pkthdr **pkt_header, const u_char **pkt_data);
#ifdef HAVE_PCAP_REMOTE
static pcap_t* (*p_pcap_open) (const char *, int, int, int,
                               struct pcap_rmtauth *, char *);
static int     (*p_pcap_findalldevs_ex) (char *, struct pcap_rmtauth *,
                                         pcap_if_t **, char *);
static int     (*p_pcap_createsrcstr) (char *, int, const char *, const char *,
                                       const char *, char *);
#endif
#ifdef HAVE_PCAP_SETSAMPLING
static struct pcap_samp* (*p_pcap_setsampling)(pcap_t *);
#endif

#ifdef HAVE_PCAP_LIST_DATALINKS
static int  (*p_pcap_list_datalinks)(pcap_t *, int **);
#endif

#ifdef HAVE_PCAP_SET_DATALINK
static int  (*p_pcap_set_datalink)(pcap_t *, int);
#endif

#ifdef HAVE_FREE_DATALINKS
static int  (*p_pcap_free_datalinks)(int *);
#endif

typedef struct {
      const char  *name;
      gpointer    *ptr;
      gboolean    optional;
} symbol_table_t;

#define SYM(x, y) { STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }

void
load_wpcap(void)
{

      /* These are the symbols I need or want from Wpcap */
      static const symbol_table_t   symbols[] = {
            SYM(pcap_lookupdev, FALSE),
            SYM(pcap_close, FALSE),
            SYM(pcap_stats, FALSE),
            SYM(pcap_dispatch, FALSE),
            SYM(pcap_snapshot, FALSE),
            SYM(pcap_datalink, FALSE),
            SYM(pcap_setfilter, FALSE),
            SYM(pcap_geterr, FALSE),
            SYM(pcap_compile, FALSE),
            SYM(pcap_lookupnet, FALSE),
#ifdef HAVE_PCAP_REMOTE
            SYM(pcap_open, FALSE),
            SYM(pcap_findalldevs_ex, FALSE),
            SYM(pcap_createsrcstr, FALSE),
#else
            SYM(pcap_open_live, FALSE),
#endif
#ifdef HAVE_PCAP_SETSAMPLING
            SYM(pcap_setsampling, TRUE),
#endif
            SYM(pcap_loop, FALSE),
            SYM(pcap_freecode, TRUE),
#ifdef HAVE_PCAP_FINDALLDEVS
            SYM(pcap_findalldevs, TRUE),
            SYM(pcap_freealldevs, TRUE),
#endif
#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
            SYM(pcap_datalink_name_to_val, TRUE),
#endif
#ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
            SYM(pcap_datalink_val_to_name, TRUE),
#endif
#ifdef HAVE_PCAP_BREAKLOOP
            /*
             * We don't try to work around the lack of this at
             * run time; it's present in WinPcap 3.1, which is
             * the version we build with and ship with.
             */
            SYM(pcap_breakloop, FALSE),
#endif
            SYM(pcap_lib_version, TRUE),
            SYM(pcap_setbuff, TRUE),
            SYM(pcap_next_ex, TRUE),
#ifdef HAVE_PCAP_LIST_DATALINKS
            SYM(pcap_list_datalinks, FALSE),
#endif
#ifdef HAVE_PCAP_SET_DATALINK
            SYM(pcap_set_datalink, FALSE),
#endif
#ifdef HAVE_PCAP_FREE_DATALINKS
            SYM(pcap_free_datalinks, TRUE),
#endif
            { NULL, NULL, FALSE }
      };

      GModule           *wh; /* wpcap handle */
      const symbol_table_t    *sym;

      wh = g_module_open("wpcap", 0);

      if (!wh) {
            return;
      }

      sym = symbols;
      while (sym->name) {
            if (!g_module_symbol(wh, sym->name, sym->ptr)) {
                  if (sym->optional) {
                        /*
                         * We don't care if it's missing; we just
                         * don't use it.
                         */
                        *sym->ptr = NULL;
                  } else {
                        /*
                         * We require this symbol.
                         */
                        return;
                  }
            }
            sym++;
      }


      has_wpcap = TRUE;
}

char*
pcap_lookupdev (char *a)
{
      g_assert(has_wpcap);
      return p_pcap_lookupdev(a);
}

void
pcap_close(pcap_t *a)
{
      g_assert(has_wpcap);
      p_pcap_close(a);
}

int
pcap_stats(pcap_t *a, struct pcap_stat *b)
{
      g_assert(has_wpcap);
      return p_pcap_stats(a, b);
}

int
pcap_dispatch(pcap_t *a, int b, pcap_handler c, guchar *d)
{
      g_assert(has_wpcap);
      return p_pcap_dispatch(a, b, c, d);
}

int
pcap_snapshot(pcap_t *a)
{
      g_assert(has_wpcap);
      return p_pcap_snapshot(a);
}

int
pcap_datalink(pcap_t *a)
{
      g_assert(has_wpcap);
      return p_pcap_datalink(a);
}

#ifdef HAVE_PCAP_SET_DATALINK
int
pcap_set_datalink(pcap_t *p, int dlt)
{
      g_assert(has_wpcap);
      return p_pcap_set_datalink(p, dlt);
}
#endif

int
pcap_setfilter(pcap_t *a, struct bpf_program *b)
{
      g_assert(has_wpcap);
      return p_pcap_setfilter(a, b);
}

char*
pcap_geterr(pcap_t *a)
{
      g_assert(has_wpcap);
      return p_pcap_geterr(a);
}

int
pcap_compile(pcap_t *a, struct bpf_program *b, const char *c, int d,
            bpf_u_int32 e)
{
      g_assert(has_wpcap);
      return p_pcap_compile(a, b, c, d, e);
}

int
#ifdef WPCAP_CONSTIFIED
pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
#else
pcap_lookupnet(char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
#endif
{
      g_assert(has_wpcap);
      return p_pcap_lookupnet(a, b, c, d);
}

pcap_t*
#ifdef WPCAP_CONSTIFIED
pcap_open_live(const char *a, int b, int c, int d, char *e)
#else
pcap_open_live(char *a, int b, int c, int d, char *e)
#endif
{
      g_assert(has_wpcap);
      return p_pcap_open_live(a, b, c, d, e);
}

#ifdef HAVE_PCAP_REMOTE
pcap_t*
pcap_open(const char *a, int b, int c, int d, struct pcap_rmtauth *e, char *f)
{
    g_assert(has_wpcap);
    return p_pcap_open(a, b, c, d, e, f);
}

int
pcap_findalldevs_ex(char *a, struct pcap_rmtauth *b, pcap_if_t **c, char *d)
{
    g_assert(has_wpcap);
    return p_pcap_findalldevs_ex(a, b, c, d);
}

int
pcap_createsrcstr(char *a, int b, const char *c, const char *d, const char *e,
                  char *f)
{
    g_assert(has_wpcap);
    return p_pcap_createsrcstr(a, b, c, d, e, f);
}
#endif

#ifdef HAVE_PCAP_SETSAMPLING
struct pcap_samp *
pcap_setsampling(pcap_t *a)
{
    g_assert(has_wpcap);
    if (p_pcap_setsampling != NULL) {
        return p_pcap_setsampling(a);
    }
    return NULL;
}
#endif

int
pcap_loop(pcap_t *a, int b, pcap_handler c, guchar *d)
{
      g_assert(has_wpcap);
      return p_pcap_loop(a, b, c, d);
}

void
pcap_freecode(struct bpf_program *a)
{
      g_assert(has_wpcap);
    if(p_pcap_freecode) {
          p_pcap_freecode(a);
    }
}

#ifdef HAVE_PCAP_FINDALLDEVS
int
pcap_findalldevs(pcap_if_t **a, char *b)
{
      g_assert(has_wpcap && p_pcap_findalldevs != NULL);
      return p_pcap_findalldevs(a, b);
}

void
pcap_freealldevs(pcap_if_t *a)
{
      g_assert(has_wpcap && p_pcap_freealldevs != NULL);
      p_pcap_freealldevs(a);
}
#endif

#if defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
/*
 * Table of DLT_ types, names, and descriptions, for use if the version
 * of WinPcap we have installed lacks "pcap_datalink_name_to_val()"
 * or "pcap_datalink_val_to_name()".
 */
struct dlt_choice {
      const char *name;
      const char *description;
      int   dlt;
};

#define DLT_CHOICE(code, description) { #code, description, code }
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }

static struct dlt_choice dlt_choices[] = {
      DLT_CHOICE(DLT_NULL, "BSD loopback"),
      DLT_CHOICE(DLT_EN10MB, "Ethernet"),
      DLT_CHOICE(DLT_IEEE802, "Token ring"),
      DLT_CHOICE(DLT_ARCNET, "ARCNET"),
      DLT_CHOICE(DLT_SLIP, "SLIP"),
      DLT_CHOICE(DLT_PPP, "PPP"),
      DLT_CHOICE(DLT_FDDI, "FDDI"),
      DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
      DLT_CHOICE(DLT_RAW, "Raw IP"),
#ifdef DLT_SLIP_BSDOS
      DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
#endif
#ifdef DLT_PPP_BSDOS
      DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
#endif
#ifdef DLT_ATM_CLIP
      DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
#endif
#ifdef DLT_PPP_SERIAL
      DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
#endif
#ifdef DLT_PPP_ETHER
      DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
#endif
#ifdef DLT_C_HDLC
      DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
#endif
#ifdef DLT_IEEE802_11
      DLT_CHOICE(DLT_IEEE802_11, "802.11"),
#endif
#ifdef DLT_FRELAY
      DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
#endif
#ifdef DLT_LOOP
      DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
#endif
#ifdef DLT_ENC
      DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
#endif
#ifdef DLT_LINUX_SLL
      DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
#endif
#ifdef DLT_LTALK
      DLT_CHOICE(DLT_LTALK, "Localtalk"),
#endif
#ifdef DLT_PFLOG
      DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
#endif
#ifdef DLT_PRISM_HEADER
      DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
#endif
#ifdef DLT_IP_OVER_FC
      DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
#endif
#ifdef DLT_SUNATM
      DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
#endif
#ifdef DLT_IEEE802_11_RADIO
      DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radio information header"),
#endif
#ifdef DLT_ARCNET_LINUX
      DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
#endif
#ifdef DLT_LINUX_IRDA
      DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
#endif
#ifdef DLT_LINUX_LAPD
      DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
#endif
#ifdef DLT_LANE8023
      DLT_CHOICE(DLT_LANE8023, "Linux 802.3 LANE"),
#endif
#ifdef DLT_CIP
      DLT_CHOICE(DLT_CIP, "Linux Classical IP-over-ATM"),
#endif
#ifdef DLT_HDLC
      DLT_CHOICE(DLT_HDLC, "Cisco HDLC"),
#endif
      DLT_CHOICE_SENTINEL
};
#endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */

#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
int
pcap_datalink_name_to_val(const char *name)
{
      int i;

      g_assert(has_wpcap);

      if (p_pcap_datalink_name_to_val != NULL)
            return p_pcap_datalink_name_to_val(name);
      else {
            /*
             * We don't have it in WinPcap; do it ourselves.
             */
            for (i = 0; dlt_choices[i].name != NULL; i++) {
                  if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
                      name) == 0)
                        return dlt_choices[i].dlt;
            }
            return -1;
      }
}
#endif

#ifdef HAVE_PCAP_LIST_DATALINKS
int
pcap_list_datalinks(pcap_t *p, int **ddlt)
{
      g_assert(has_wpcap);
      return p_pcap_list_datalinks(p, ddlt);
}
#endif

#ifdef HAVE_PCAP_FREE_DATALINKS
void
pcap_free_datalinks(int *ddlt)
{
      g_assert(has_wpcap);

      /*
       * If we don't have pcap_free_datalinks() in WinPcap,
       * we don't free the memory - we can't use free(), as
       * we might not have been built with the same version
       * of the C runtime library as WinPcap was, and, if we're
       * not, free() isn't guaranteed to work on something
       * allocated by WinPcap.
       */
      if (p_pcap_free_datalinks != NULL)
            p_pcap_free_datalinks(ddlt);
}
#endif

#ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
const char *
pcap_datalink_val_to_name(int dlt)
{
      int i;

      g_assert(has_wpcap);

      if (p_pcap_datalink_val_to_name != NULL)
            return p_pcap_datalink_val_to_name(dlt);
      else {
            /*
             * We don't have it in WinPcap; do it ourselves.
             */
            for (i = 0; dlt_choices[i].name != NULL; i++) {
                  if (dlt_choices[i].dlt == dlt)
                        return dlt_choices[i].name + sizeof("DLT_") - 1;
            }
            return NULL;
      }
}
#endif

#ifdef HAVE_PCAP_BREAKLOOP
void pcap_breakloop(pcap_t *a)
{
      p_pcap_breakloop(a);
}
#endif

/* setbuff is win32 specific! */
int pcap_setbuff(pcap_t *a, int b)
{
      g_assert(has_wpcap);
      return p_pcap_setbuff(a, b);
}

/* pcap_next_ex is available since libpcap 0.8 / WinPcap 3.0! */
/* (if you get a declaration warning here, try to update to at least WinPcap 3.1b4 develpack) */
int pcap_next_ex (pcap_t *a, struct pcap_pkthdr **b, const u_char **c)
{
      g_assert(has_wpcap);
      return p_pcap_next_ex(a, b, c);
}

#ifdef HAVE_PCAP_REMOTE
GList *
get_remote_interface_list(const char *hostname, const char *port,
                          int auth_type, const char *username,
                          const char *passwd, int *err, char **err_str)
{
    struct pcap_rmtauth auth;
    char source[PCAP_BUF_SIZE];
    char errbuf[PCAP_ERRBUF_SIZE];
    GList *result;

    if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
                          NULL, errbuf) == -1) {
        *err = CANT_GET_INTERFACE_LIST;
        if (err_str != NULL)
            *err_str = cant_get_if_list_error_message(errbuf);
        return NULL;
    }

    auth.type = auth_type;
    auth.username = g_strdup(username);
    auth.password = g_strdup(passwd);

    result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
    g_free(auth.username);
    g_free(auth.password);

    return result;
}
#endif

/*
 * This will use "pcap_findalldevs()" if we have it, otherwise it'll
 * fall back on "pcap_lookupdev()".
 */
GList *
get_interface_list(int *err, char **err_str)
{
      GList  *il = NULL;
      wchar_t *names;
      char *win95names;
      char ascii_name[MAX_WIN_IF_NAME_LEN + 1];
      char ascii_desc[MAX_WIN_IF_NAME_LEN + 1];
      int i, j;
      char errbuf[PCAP_ERRBUF_SIZE];

#ifdef HAVE_PCAP_FINDALLDEVS
      if (p_pcap_findalldevs != NULL)
            return get_interface_list_findalldevs(err, err_str);
#endif

      /*
       * In WinPcap, pcap_lookupdev is implemented by calling
       * PacketGetAdapterNames.  According to the documentation
       * I could find:
       *
       *    http://www.winpcap.org/docs/man/html/Packet32_8c.html#a43
       *
       * this means that:
       *
       * On Windows OT (95, 98, Me), pcap_lookupdev returns a sequence
       * of bytes consisting of:
       *
       *    a sequence of null-terminated ASCII strings (i.e., each
       *    one is terminated by a single 0 byte), giving the names
       *    of the interfaces;
       *
       *    an empty ASCII string (i.e., a single 0 byte);
       *
       *    a sequence of null-terminated ASCII strings, giving the
       *    descriptions of the interfaces;
       *
       *    an empty ASCII string.
       *
       * On Windows NT (NT 4.0, W2K, WXP, W2K3, etc.), pcap_lookupdev
       * returns a sequence of bytes consisting of:
       *
       *    a sequence of null-terminated double-byte Unicode strings
       *    (i.e., each one consits of a sequence of double-byte
       *    characters, terminated by a double-byte 0), giving the
       *    names of the interfaces;
       *
       *    an empty Unicode string (i.e., a double 0 byte);
       *
       *    a sequence of null-terminated ASCII strings, giving the
       *    descriptions of the interfaces;
       *
       *    an empty ASCII string.
       *
       * The Nth string in the first sequence is the name of the Nth
       * adapter; the Nth string in the second sequence is the
       * description of the Nth adapter.
       */

      names = (wchar_t *)pcap_lookupdev(errbuf);
      i = 0;

      if (names) {
            char* desc = 0;
            int desc_pos = 0;

            if (names[0]<256) {
                  /*
                   * If names[0] is less than 256 it means the first
                   * byte is 0.  This implies that we are using Unicode
                   * characters.
                   */
                  while (*(names+desc_pos) || *(names+desc_pos-1))
                        desc_pos++;
                  desc_pos++; /* Step over the extra '\0' */
                  desc = (char*)(names + desc_pos); /* cast *after* addition */

                  while (names[i] != 0) {
                        /*
                         * Copy the Unicode description to an ASCII
                         * string.
                         */
                        j = 0;
                        while (*desc != 0) {
                              if (j < MAX_WIN_IF_NAME_LEN)
                                    ascii_desc[j++] = *desc;
                              desc++;
                        }
                        ascii_desc[j] = '\0';
                        desc++;

                        /*
                         * Copy the Unicode name to an ASCII string.
                         */
                        j = 0;
                        while (names[i] != 0) {
                              if (j < MAX_WIN_IF_NAME_LEN)
                              ascii_name[j++] = (char) names[i++];
                        }
                        ascii_name[j] = '\0';
                        i++;
                        il = g_list_append(il,
                            if_info_new(ascii_name, ascii_desc));
                  }
            } else {
                  /*
                   * Otherwise we are in Windows 95/98 and using ASCII
                   * (8-bit) characters.
                   */
                  win95names=(char *)names;
                  while (*(win95names+desc_pos) || *(win95names+desc_pos-1))
                        desc_pos++;
                  desc_pos++; /* Step over the extra '\0' */
                  desc = win95names + desc_pos;

                  while (win95names[i] != '\0') {
                        /*
                         * "&win95names[i]" points to the current
                         * interface name, and "desc" points to
                         * that interface's description.
                         */
                        il = g_list_append(il,
                            if_info_new(&win95names[i], desc));

                        /*
                         * Skip to the next description.
                         */
                        while (*desc != 0)
                              desc++;
                        desc++;

                        /*
                         * Skip to the next name.
                         */
                        while (win95names[i] != 0)
                              i++;
                        i++;
                  }
            }
      }

      if (il == NULL) {
            /*
             * No interfaces found.
             */
            *err = NO_INTERFACES_FOUND;
            if (err_str != NULL)
                  *err_str = NULL;
      }

      return il;
}

/*
 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
 * "get_interface_list()".
 */
gchar *
cant_get_if_list_error_message(const char *err_str)
{
      /*
       * If the error message includes "Not enough storage is available
       * to process this command" or "The operation completed successfully",
       * suggest that they install a WinPcap version later than 3.0.
       */
      if (strstr(err_str, "Not enough storage is available to process this command") != NULL ||
          strstr(err_str, "The operation completed successfully") != NULL) {
            return g_strdup_printf("Can't get list of interfaces: %s\n"
"This might be a problem with WinPcap 3.0; you should try updating to\n"
"a later version of WinPcap - see the WinPcap site at www.winpcap.org",
                err_str);
      }
      return g_strdup_printf("Can't get list of interfaces: %s", err_str);
}

/*
 * Append the version of WinPcap with which we were compiled to a GString.
 */
void
get_compiled_pcap_version(GString *str)
{
      g_string_append(str, "with WinPcap (version unknown)");
}

/*
 * Append the version of WinPcap with which we we're running to a GString.
 */
void
get_runtime_pcap_version(GString *str)
{
      /*
       * On Windows, we might have been compiled with WinPcap but
       * might not have it loaded; indicate whether we have it or
       * not and, if we have it and we have "pcap_lib_version()",
       * what version we have.
       */
      GModule *handle;        /* handle returned by dlopen */
      static gchar *packetVer;
      gchar *blankp;

      if (has_wpcap) {
            g_string_append_printf(str, "with ");
            if (p_pcap_lib_version != NULL)
                  g_string_append_printf(str, p_pcap_lib_version());
            else {
                  /*
                   * An alternative method of obtaining the version
                   * number, by using the PacketLibraryVersion
                   * string from packet.dll.
                   *
                   * Unfortunately, in WinPcap 3.0, it returns
                   * "3.0 alpha3", even in the final version of
                   * WinPcap 3.0, so if there's a blank in the
                   * string, we strip it and everything after
                   * it from the string, so we don't misleadingly
                   * report that 3.0 alpha3 is being used when
                   * the final version is being used.
                   */
                  if (packetVer == NULL) {
                        packetVer = "version unknown";
                        handle = g_module_open("Packet.dll", 0);
                        if (handle != NULL) {
                              if (g_module_symbol(handle,
                                  "PacketLibraryVersion",
                                  (gpointer*)&packetVer)) {
                                    packetVer = g_strdup(packetVer);
                                    blankp = strchr(packetVer, ' ');
                                    if (blankp != NULL)
                                          *blankp = '\0';
                              } else {
                                    packetVer = "version unknown";
                              }
                              g_module_close(handle);
                        }
                  }
                  g_string_append_printf(str, "WinPcap (%s)", packetVer);
            }
      } else
            g_string_append(str, "without WinPcap");
}

#else /* HAVE_LIBPCAP */

void
load_wpcap(void)
{
      return;
}

/*
 * Append an indication that we were not compiled with WinPcap
 * to a GString.
 */
void
get_compiled_pcap_version(GString *str)
{
      g_string_append(str, "without WinPcap");
}

/*
 * Don't append anything, as we weren't even compiled to use WinPcap.
 */
void
get_runtime_pcap_version(GString *str _U_)
{
}

#endif /* HAVE_LIBPCAP */

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