2 * WinPcap-specific interfaces for capturing. We load WinPcap at run
3 * time, so that we only need one Ethereal binary and one Tethereal binary
4 * for Windows, regardless of whether WinPcap is installed or not.
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
10 * Copyright 2001 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 #include "pcap-util.h"
39 #include "pcap-util-int.h"
41 /* XXX - yes, I know, I should move cppmagic.h to a generic location. */
42 #include "tools/lemon/cppmagic.h"
44 gboolean has_wpcap = FALSE;
48 static char* (*p_pcap_lookupdev) (char *);
49 static void (*p_pcap_close) (pcap_t *);
50 static int (*p_pcap_stats) (pcap_t *, struct pcap_stat *);
51 static int (*p_pcap_dispatch) (pcap_t *, int, pcap_handler, guchar *);
52 static int (*p_pcap_snapshot) (pcap_t *);
53 static int (*p_pcap_datalink) (pcap_t *);
54 static int (*p_pcap_setfilter) (pcap_t *, struct bpf_program *);
55 static char* (*p_pcap_geterr) (pcap_t *);
56 static int (*p_pcap_compile) (pcap_t *, struct bpf_program *, char *, int,
58 #ifdef WPCAP_CONSTIFIED
59 static int (*p_pcap_lookupnet) (const char *, bpf_u_int32 *, bpf_u_int32 *,
61 static pcap_t* (*p_pcap_open_live) (const char *, int, int, int, char *);
63 static int (*p_pcap_lookupnet) (char *, bpf_u_int32 *, bpf_u_int32 *,
65 static pcap_t* (*p_pcap_open_live) (char *, int, int, int, char *);
67 static int (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);
68 static void (*p_pcap_freecode) (struct bpf_program *);
69 #ifdef HAVE_PCAP_FINDALLDEVS
70 static int (*p_pcap_findalldevs) (pcap_if_t **, char *);
71 static void (*p_pcap_freealldevs) (pcap_if_t *);
73 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
74 static int (*p_pcap_datalink_name_to_val) (const char *);
76 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
77 static const char *(*p_pcap_datalink_val_to_name) (int);
79 static const char *(*p_pcap_lib_version) (void);
80 static int (*p_pcap_setbuff) (pcap_t *, int dim);
88 #define SYM(x, y) { STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }
94 /* These are the symbols I need or want from Wpcap */
95 static const symbol_table_t symbols[] = {
96 SYM(pcap_lookupdev, FALSE),
97 SYM(pcap_close, FALSE),
98 SYM(pcap_stats, FALSE),
99 SYM(pcap_dispatch, FALSE),
100 SYM(pcap_snapshot, FALSE),
101 SYM(pcap_datalink, FALSE),
102 SYM(pcap_setfilter, FALSE),
103 SYM(pcap_geterr, FALSE),
104 SYM(pcap_compile, FALSE),
105 SYM(pcap_lookupnet, FALSE),
106 SYM(pcap_open_live, FALSE),
107 SYM(pcap_loop, FALSE),
108 SYM(pcap_freecode, FALSE),
109 #ifdef HAVE_PCAP_FINDALLDEVS
110 SYM(pcap_findalldevs, TRUE),
111 SYM(pcap_freealldevs, TRUE),
113 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
114 SYM(pcap_datalink_name_to_val, TRUE),
116 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
117 SYM(pcap_datalink_val_to_name, TRUE),
119 SYM(pcap_lib_version, TRUE),
120 SYM(pcap_setbuff, TRUE),
121 { NULL, NULL, FALSE }
124 GModule *wh; /* wpcap handle */
125 const symbol_table_t *sym;
127 wh = g_module_open("wpcap", 0);
135 if (!g_module_symbol(wh, sym->name, sym->ptr)) {
138 * We don't care if it's missing; we just
144 * We require this symbol.
157 pcap_lookupdev (char *a)
160 return p_pcap_lookupdev(a);
164 pcap_close(pcap_t *a)
171 pcap_stats(pcap_t *a, struct pcap_stat *b)
174 return p_pcap_stats(a, b);
178 pcap_dispatch(pcap_t *a, int b, pcap_handler c, guchar *d)
181 return p_pcap_dispatch(a, b, c, d);
185 pcap_snapshot(pcap_t *a)
188 return p_pcap_snapshot(a);
192 pcap_datalink(pcap_t *a)
195 return p_pcap_datalink(a);
199 pcap_setfilter(pcap_t *a, struct bpf_program *b)
202 return p_pcap_setfilter(a, b);
206 pcap_geterr(pcap_t *a)
209 return p_pcap_geterr(a);
213 pcap_compile(pcap_t *a, struct bpf_program *b, char *c, int d,
217 return p_pcap_compile(a, b, c, d, e);
221 #ifdef WPCAP_CONSTIFIED
222 pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
224 pcap_lookupnet(char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
228 return p_pcap_lookupnet(a, b, c, d);
232 #ifdef WPCAP_CONSTIFIED
233 pcap_open_live(const char *a, int b, int c, int d, char *e)
235 pcap_open_live(char *a, int b, int c, int d, char *e)
239 return p_pcap_open_live(a, b, c, d, e);
243 pcap_loop(pcap_t *a, int b, pcap_handler c, guchar *d)
246 return p_pcap_loop(a, b, c, d);
250 pcap_freecode(struct bpf_program *a)
256 #ifdef HAVE_PCAP_FINDALLDEVS
258 pcap_findalldevs(pcap_if_t **a, char *b)
260 g_assert(has_wpcap && p_pcap_findalldevs != NULL);
261 return p_pcap_findalldevs(a, b);
265 pcap_freealldevs(pcap_if_t *a)
267 g_assert(has_wpcap && p_pcap_freealldevs != NULL);
268 p_pcap_freealldevs(a);
272 #if defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
274 * Table of DLT_ types, names, and descriptions, for use if the version
275 * of WinPcap we have installed lacks "pcap_datalink_name_to_val()"
276 * or "pcap_datalink_val_to_name()".
280 const char *description;
284 #define DLT_CHOICE(code, description) { #code, description, code }
285 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
287 static struct dlt_choice dlt_choices[] = {
288 DLT_CHOICE(DLT_NULL, "BSD loopback"),
289 DLT_CHOICE(DLT_EN10MB, "Ethernet"),
290 DLT_CHOICE(DLT_IEEE802, "Token ring"),
291 DLT_CHOICE(DLT_ARCNET, "ARCNET"),
292 DLT_CHOICE(DLT_SLIP, "SLIP"),
293 DLT_CHOICE(DLT_PPP, "PPP"),
294 DLT_CHOICE(DLT_FDDI, "FDDI"),
295 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
296 DLT_CHOICE(DLT_RAW, "Raw IP"),
297 #ifdef DLT_SLIP_BSDOS
298 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
301 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
304 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
306 #ifdef DLT_PPP_SERIAL
307 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
310 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
313 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
315 #ifdef DLT_IEEE802_11
316 DLT_CHOICE(DLT_IEEE802_11, "802.11"),
319 DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
322 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
325 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
328 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
331 DLT_CHOICE(DLT_LTALK, "Localtalk"),
334 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
336 #ifdef DLT_PRISM_HEADER
337 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
339 #ifdef DLT_IP_OVER_FC
340 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
343 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
345 #ifdef DLT_IEEE802_11_RADIO
346 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radio information header"),
348 #ifdef DLT_ARCNET_LINUX
349 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
351 #ifdef DLT_LINUX_IRDA
352 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
355 DLT_CHOICE(DLT_LANE8023, "Linux 802.3 LANE"),
358 DLT_CHOICE(DLT_CIP, "Linux Classical IP-over-ATM"),
361 DLT_CHOICE(DLT_HDLC, "Cisco HDLC"),
365 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
367 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
369 pcap_datalink_name_to_val(const char *name)
375 if (p_pcap_datalink_name_to_val != NULL)
376 return p_pcap_datalink_name_to_val(name);
379 * We don't have it in WinPcap; do it ourselves.
381 for (i = 0; dlt_choices[i].name != NULL; i++) {
382 if (strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
384 return dlt_choices[i].dlt;
391 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
393 pcap_datalink_val_to_name(int dlt)
399 if (p_pcap_datalink_val_to_name != NULL)
400 return p_pcap_datalink_val_to_name(dlt);
403 * We don't have it in WinPcap; do it ourselves.
405 for (i = 0; dlt_choices[i].name != NULL; i++) {
406 if (dlt_choices[i].dlt == dlt)
407 return dlt_choices[i].name + sizeof("DLT_") - 1;
414 /* setbuff is win32 specific! */
415 int pcap_setbuff(pcap_t *a, int b)
418 return p_pcap_setbuff(a, b);
422 * This will use "pcap_findalldevs()" if we have it, otherwise it'll
423 * fall back on "pcap_lookupdev()".
426 get_interface_list(int *err, char *err_str)
431 char ascii_name[MAX_WIN_IF_NAME_LEN + 1];
432 char ascii_desc[MAX_WIN_IF_NAME_LEN + 1];
435 #ifdef HAVE_PCAP_FINDALLDEVS
436 if (p_pcap_findalldevs != NULL)
437 return get_interface_list_findalldevs(err, err_str);
441 * In WinPcap, pcap_lookupdev is implemented by calling
442 * PacketGetAdapterNames. According to the documentation
445 * http://winpcap.polito.it/docs/man/html/Packet32_8c.html#a43
449 * On Windows OT (95, 98, Me), pcap_lookupdev returns a sequence
450 * of bytes consisting of:
452 * a sequence of null-terminated ASCII strings (i.e., each
453 * one is terminated by a single 0 byte), giving the names
456 * an empty ASCII string (i.e., a single 0 byte);
458 * a sequence of null-terminated ASCII strings, giving the
459 * descriptions of the interfaces;
461 * an empty ASCII string.
463 * On Windows NT (NT 4.0, W2K, WXP, W2K3, etc.), pcap_lookupdev
464 * returns a sequence of bytes consisting of:
466 * a sequence of null-terminated double-byte Unicode strings
467 * (i.e., each one consits of a sequence of double-byte
468 * characters, terminated by a double-byte 0), giving the
469 * names of the interfaces;
471 * an empty Unicode string (i.e., a double 0 byte);
473 * a sequence of null-terminated ASCII strings, giving the
474 * descriptions of the interfaces;
476 * an empty ASCII string.
478 * The Nth string in the first sequence is the name of the Nth
479 * adapter; the Nth string in the second sequence is the
480 * description of the Nth adapter.
483 names = (wchar_t *)pcap_lookupdev(err_str);
492 * If names[0] is less than 256 it means the first
493 * byte is 0. This implies that we are using Unicode
496 while (*(names+desc_pos) || *(names+desc_pos-1))
498 desc_pos++; /* Step over the extra '\0' */
499 desc = (char*)(names + desc_pos); /* cast *after* addition */
501 while (names[i] != 0) {
503 * Copy the Unicode description to an ASCII
508 if (j < MAX_WIN_IF_NAME_LEN)
509 ascii_desc[j++] = *desc;
512 ascii_desc[j] = '\0';
516 * Copy the Unicode name to an ASCII string.
519 while (names[i] != 0) {
520 if (j < MAX_WIN_IF_NAME_LEN)
521 ascii_name[j++] = (char) names[i++];
523 ascii_name[j] = '\0';
525 il = g_list_append(il,
526 if_info_new(ascii_name, ascii_desc));
530 * Otherwise we are in Windows 95/98 and using ASCII
531 * (8-bit) characters.
533 win95names=(char *)names;
534 while (*(win95names+desc_pos) || *(win95names+desc_pos-1))
536 desc_pos++; /* Step over the extra '\0' */
537 desc = win95names + desc_pos;
539 while (win95names[i] != '\0') {
541 * "&win95names[i]" points to the current
542 * interface name, and "desc" points to
543 * that interface's description.
545 il = g_list_append(il,
546 if_info_new(&win95names[i], desc));
549 * Skip to the next description.
556 * Skip to the next name.
558 while (win95names[i] != 0)
567 * No interfaces found.
569 *err = NO_INTERFACES_FOUND;
576 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
577 * "get_interface_list()".
580 cant_get_if_list_error_message(const char *err_str)
583 * If the error message includes "Not enough storage is available
584 * to process this command" or "The operation completed successfully",
585 * suggest that they install a WinPcap version later than 3.0.
587 if (strstr(err_str, "Not enough storage is available to process this command") != NULL ||
588 strstr(err_str, "The operation completed successfully") != NULL) {
589 return g_strdup_printf("Can't get list of interfaces: %s\n"
590 "This might be a problem with WinPcap 3.0; you should try updating to\n"
591 "a later version of WinPcap - see the WinPcap site at winpcap.polito.it",
594 return g_strdup_printf("Can't get list of interfaces: %s", err_str);
598 * Append the version of WinPcap with which we were compiled to a GString.
601 get_compiled_pcap_version(GString *str)
603 g_string_append(str, "with WinPcap (version unknown)");
607 * Append the version of WinPcap with which we we're running to a GString.
610 get_runtime_pcap_version(GString *str)
613 * On Windows, we might have been compiled with WinPcap but
614 * might not have it loaded; indicate whether we have it or
615 * not and, if we have it and we have "pcap_lib_version()",
616 * what version we have.
618 GModule *handle; /* handle returned by dlopen */
619 static gchar *packetVer;
623 g_string_sprintfa(str, "with ");
624 if (p_pcap_lib_version != NULL)
625 g_string_sprintfa(str, p_pcap_lib_version());
628 * An alternative method of obtaining the version
629 * number, by using the PacketLibraryVersion"
630 * string from packet.dll.
632 * Unfortunately, in WinPcap 3.0, it returns
633 * "3.0 alpha3", even in the final version of
634 * WinPcap 3.0, so if there's a blank in the
635 * string, we strip it and everything after
636 * it from the string, so we don't misleadingly
637 * report that 3.0 alpha3 is being used when
638 * the final version is being used.
640 if (packetVer == NULL) {
641 packetVer = "version unknown";
642 handle = g_module_open("Packet.dll", 0);
643 if (handle != NULL) {
644 if (g_module_symbol(handle,
645 "PacketLibraryVersion",
646 (gpointer*)&packetVer)) {
647 packetVer = g_strdup(packetVer);
648 blankp = strchr(packetVer, ' ');
652 g_module_close(handle);
655 g_string_sprintfa(str, "WinPcap (%s)", packetVer);
658 g_string_append(str, "without WinPcap");
659 g_string_append(str, " ");
662 #else /* HAVE_LIBPCAP */
671 * Append an indication that we were not compiled with WinPcap
675 get_compiled_pcap_version(GString *str)
677 g_string_append(str, "without WinPcap");
681 * Don't append anything, as we weren't even compiled to use WinPcap.
684 get_runtime_pcap_version(GString *str _U_)
688 #endif /* HAVE_LIBPCAP */