/capture-wpcap.c
C | 992 lines | 703 code | 96 blank | 193 comment | 89 complexity | c96569531d3385a3236fda3aefb9e852 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause
- /* 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.
- *
- * $Id$
- *
- * 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) { 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 {
- 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
- #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 (" STRINGIFY(PCAP_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 */