/* 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.

*

* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#include "config.h"

#include <stdio.h>

#include <glib.h>

#include <gmodule.h>

#include <epan/strutil.h>

#include "capture_ifinfo.h"

#include "capture-pcap-util.h"

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

#include "capture-wpcap.h"

#include <wsutil/file_util.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);

static int (*p_pcap_compile_nopcap) (int, int, struct bpf_program *, const char *, int,

bpf_u_int32);

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 *);

static int (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);

#ifdef HAVE_PCAP_OPEN_DEAD

static pcap_t* (*p_pcap_open_dead) (int, int);

#endif

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_DATALINK_VAL_TO_DESCRIPTION

static const char *(*p_pcap_datalink_val_to_description) (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_PCAP_FREE_DATALINKS

static int (*p_pcap_free_datalinks)(int *);

#endif

#ifdef HAVE_BPF_IMAGE

static char *(*p_bpf_image) (const struct bpf_insn *, int);

#endif

typedef struct {

const char *name;

gpointer *ptr;

gboolean optional;

} symbol_table_t;

#define SYM(x, y) { G_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_compile_nopcap, FALSE),

SYM(pcap_lookupnet, FALSE),

#ifdef HAVE_PCAP_REMOTE

SYM(pcap_open, FALSE),

SYM(pcap_findalldevs_ex, FALSE),

SYM(pcap_createsrcstr, FALSE),

#endif

SYM(pcap_open_live, FALSE),

#ifdef HAVE_PCAP_OPEN_DEAD

SYM(pcap_open_dead, 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_DATALINK_VAL_TO_DESCRIPTION

SYM(pcap_datalink_val_to_description, 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

#ifdef HAVE_BPF_IMAGE

SYM(bpf_image, FALSE),

#endif

{ NULL, NULL, FALSE }

};

GModule *wh; /* wpcap handle */

const symbol_table_t *sym;

wh = ws_module_open("wpcap.dll", 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;

}

/*

* The official list of WinPcap mirrors is at

* http://www.winpcap.org/misc/mirrors.htm

*/

char *

cant_load_winpcap_err(const char *app_name)

{

return g_strdup_printf(

"Unable to load WinPcap (wpcap.dll); %s will not be able to capture\n"

"packets.\n"

"\n"

"In order to capture packets, WinPcap must be installed; see\n"

"\n"

" http://www.winpcap.org/\n"

"\n"

"or the mirror at\n"

"\n"

" http://www.mirrors.wiretapped.net/security/packet-capture/winpcap/\n"

"\n"

"or the mirror at\n"

"\n"

" http://winpcap.cs.pu.edu.tw/\n"

"\n"

"for a downloadable version of WinPcap and for instructions on how to install\n"

"WinPcap.",

app_name);

}

char*

pcap_lookupdev (char *a)

{

if (!has_wpcap) {

return NULL;

}

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

pcap_compile_nopcap(int a, int b, struct bpf_program *c, const char *d, int e,

bpf_u_int32 f)

{

g_assert(has_wpcap);

return p_pcap_compile_nopcap(a, b, c, d, e, f);

}

int

pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)

{

g_assert(has_wpcap);

return p_pcap_lookupnet(a, b, c, d);

}

pcap_t*

pcap_open_live(const char *a, int b, int c, int d, char *e)

{

if (!has_wpcap) {

g_snprintf(e, PCAP_ERRBUF_SIZE,

"unable to load WinPcap (wpcap.dll); can't open %s to capture",

a);

return NULL;

}

return p_pcap_open_live(a, b, c, d, e);

}

#ifdef HAVE_PCAP_OPEN_DEAD

pcap_t*

pcap_open_dead(int a, int b)

{

if (!has_wpcap) {

return NULL;

}

return p_pcap_open_dead(a, b);

}

#endif

#ifdef HAVE_BPF_IMAGE

char *

bpf_image(const struct bpf_insn *a, int b)

{

if (!has_wpcap) {

return NULL;

}

return p_bpf_image(a, b);

}

#endif

#ifdef HAVE_PCAP_REMOTE

pcap_t*

pcap_open(const char *a, int b, int c, int d, struct pcap_rmtauth *e, char *f)

{

if (!has_wpcap) {

g_snprintf(f, PCAP_ERRBUF_SIZE,

"unable to load WinPcap (wpcap.dll); can't open %s to capture",

a);

return NULL;

}

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) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)

/*

* 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 {

};

#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

#ifdef DLT_PPI

DLT_CHOICE(DLT_PPI, "Per-Packet Information"),

#endif

DLT_CHOICE_SENTINEL

};

#endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION */

#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_DATALINK_VAL_TO_DESCRIPTION

const char *

pcap_datalink_val_to_description(int dlt)

{

int i;

g_assert(has_wpcap);

if (p_pcap_datalink_val_to_description != NULL)

return p_pcap_datalink_val_to_description(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].description);

}

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];

if (!has_wpcap) {

/*

* We don't have WinPcap, so we can't get a list of

* interfaces.

*/

*err = DONT_HAVE_PCAP;

*err_str = cant_load_winpcap_err("you");

return NULL;

}

#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, FALSE));

}

} 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, FALSE));

/*

* 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 (" G_STRINGIFY(WINPCAP_VERSION) ")");

}

/*

* 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 ws_module_open */

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 = ws_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 */