diff options
author | Guy Harris <guy@alum.mit.edu> | 2014-07-04 00:24:02 -0700 |
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committer | Guy Harris <guy@alum.mit.edu> | 2014-07-04 07:25:26 +0000 |
commit | 9e6487f24751d1c1a047ee82e158077ac67c9c68 (patch) | |
tree | 3cc4a8524062948f4951914dc9af489e0d7c4572 /caputils/capture-wpcap.c | |
parent | c5643a3d257909ed3e8752cd729b9192ae719683 (diff) |
Move utility routines for capturing into a libcaputils static library.
Some of those routines are used only in dumpcap; others are used in
TShark and Wireshark as well.
Change-Id: I9d92483f2fcff57a7d8b6bf6bdf2870505d19fb7
Reviewed-on: https://code.wireshark.org/review/2841
Reviewed-by: Guy Harris <guy@alum.mit.edu>
Diffstat (limited to 'caputils/capture-wpcap.c')
-rw-r--r-- | caputils/capture-wpcap.c | 990 |
1 files changed, 990 insertions, 0 deletions
diff --git a/caputils/capture-wpcap.c b/caputils/capture-wpcap.c new file mode 100644 index 0000000000..f4f9d61c25 --- /dev/null +++ b/caputils/capture-wpcap.c @@ -0,0 +1,990 @@ +/* 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 "caputils/capture_ifinfo.h" +#include "caputils/capture-pcap-util.h" +#include "caputils/capture-pcap-util-int.h" +#include "caputils/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 { + 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 (" 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 */ |