2 * WinPcap-specific interfaces for capturing. We load WinPcap at run
3 * time, so that we only need one Wireshark binary and one TShark binary
4 * for Windows, regardless of whether WinPcap is installed or not.
8 * Wireshark - Network traffic analyzer
9 * By Gerald Combs <gerald@wireshark.org>
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.
39 #include "capture-pcap-util.h"
40 #include "capture-pcap-util-int.h"
42 /* XXX - yes, I know, I should move cppmagic.h to a generic location. */
43 #include "tools/lemon/cppmagic.h"
45 #define MAX_WIN_IF_NAME_LEN 511
48 gboolean has_wpcap = FALSE;
53 * XXX - should we require at least WinPcap 3.1 both for building an
54 * for using Wireshark?
57 static char* (*p_pcap_lookupdev) (char *);
58 static void (*p_pcap_close) (pcap_t *);
59 static int (*p_pcap_stats) (pcap_t *, struct pcap_stat *);
60 static int (*p_pcap_dispatch) (pcap_t *, int, pcap_handler, guchar *);
61 static int (*p_pcap_snapshot) (pcap_t *);
62 static int (*p_pcap_datalink) (pcap_t *);
63 static int (*p_pcap_setfilter) (pcap_t *, struct bpf_program *);
64 static char* (*p_pcap_geterr) (pcap_t *);
65 static int (*p_pcap_compile) (pcap_t *, struct bpf_program *, const char *, int,
67 static int (*p_pcap_lookupnet) (const char *, bpf_u_int32 *, bpf_u_int32 *,
69 static pcap_t* (*p_pcap_open_live) (const char *, int, int, int, char *);
70 static int (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);
71 static void (*p_pcap_freecode) (struct bpf_program *);
72 #ifdef HAVE_PCAP_FINDALLDEVS
73 static int (*p_pcap_findalldevs) (pcap_if_t **, char *);
74 static void (*p_pcap_freealldevs) (pcap_if_t *);
76 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
77 static int (*p_pcap_datalink_name_to_val) (const char *);
79 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
80 static const char *(*p_pcap_datalink_val_to_name) (int);
82 #ifdef HAVE_PCAP_BREAKLOOP
83 static void (*p_pcap_breakloop) (pcap_t *);
85 static const char *(*p_pcap_lib_version) (void);
86 static int (*p_pcap_setbuff) (pcap_t *, int dim);
87 static int (*p_pcap_next_ex) (pcap_t *, struct pcap_pkthdr **pkt_header, const u_char **pkt_data);
88 #ifdef HAVE_PCAP_REMOTE
89 static pcap_t* (*p_pcap_open) (const char *, int, int, int,
90 struct pcap_rmtauth *, char *);
91 static int (*p_pcap_findalldevs_ex) (char *, struct pcap_rmtauth *,
92 pcap_if_t **, char *);
93 static int (*p_pcap_createsrcstr) (char *, int, const char *, const char *,
94 const char *, char *);
96 #ifdef HAVE_PCAP_SETSAMPLING
97 static struct pcap_samp* (*p_pcap_setsampling)(pcap_t *);
100 #ifdef HAVE_PCAP_LIST_DATALINKS
101 static int (*p_pcap_list_datalinks)(pcap_t *, int **);
104 #ifdef HAVE_PCAP_SET_DATALINK
105 static int (*p_pcap_set_datalink)(pcap_t *, int);
108 #ifdef HAVE_FREE_DATALINKS
109 static int (*p_pcap_free_datalinks)(int *);
118 #define SYM(x, y) { STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }
124 /* These are the symbols I need or want from Wpcap */
125 static const symbol_table_t symbols[] = {
126 SYM(pcap_lookupdev, FALSE),
127 SYM(pcap_close, FALSE),
128 SYM(pcap_stats, FALSE),
129 SYM(pcap_dispatch, FALSE),
130 SYM(pcap_snapshot, FALSE),
131 SYM(pcap_datalink, FALSE),
132 SYM(pcap_setfilter, FALSE),
133 SYM(pcap_geterr, FALSE),
134 SYM(pcap_compile, FALSE),
135 SYM(pcap_lookupnet, FALSE),
136 #ifdef HAVE_PCAP_REMOTE
137 SYM(pcap_open, FALSE),
138 SYM(pcap_findalldevs_ex, FALSE),
139 SYM(pcap_createsrcstr, FALSE),
141 SYM(pcap_open_live, FALSE),
143 #ifdef HAVE_PCAP_SETSAMPLING
144 SYM(pcap_setsampling, TRUE),
146 SYM(pcap_loop, FALSE),
147 SYM(pcap_freecode, TRUE),
148 #ifdef HAVE_PCAP_FINDALLDEVS
149 SYM(pcap_findalldevs, TRUE),
150 SYM(pcap_freealldevs, TRUE),
152 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
153 SYM(pcap_datalink_name_to_val, TRUE),
155 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
156 SYM(pcap_datalink_val_to_name, TRUE),
158 #ifdef HAVE_PCAP_BREAKLOOP
160 * We don't try to work around the lack of this at
161 * run time; it's present in WinPcap 3.1, which is
162 * the version we build with and ship with.
164 SYM(pcap_breakloop, FALSE),
166 SYM(pcap_lib_version, TRUE),
167 SYM(pcap_setbuff, TRUE),
168 SYM(pcap_next_ex, TRUE),
169 #ifdef HAVE_PCAP_LIST_DATALINKS
170 SYM(pcap_list_datalinks, FALSE),
172 #ifdef HAVE_PCAP_SET_DATALINK
173 SYM(pcap_set_datalink, FALSE),
175 #ifdef HAVE_PCAP_FREE_DATALINKS
176 SYM(pcap_free_datalinks, TRUE),
178 { NULL, NULL, FALSE }
181 GModule *wh; /* wpcap handle */
182 const symbol_table_t *sym;
184 wh = g_module_open("wpcap", 0);
192 if (!g_module_symbol(wh, sym->name, sym->ptr)) {
195 * We don't care if it's missing; we just
201 * We require this symbol.
214 pcap_lookupdev (char *a)
217 return p_pcap_lookupdev(a);
221 pcap_close(pcap_t *a)
228 pcap_stats(pcap_t *a, struct pcap_stat *b)
231 return p_pcap_stats(a, b);
235 pcap_dispatch(pcap_t *a, int b, pcap_handler c, guchar *d)
238 return p_pcap_dispatch(a, b, c, d);
242 pcap_snapshot(pcap_t *a)
245 return p_pcap_snapshot(a);
249 pcap_datalink(pcap_t *a)
252 return p_pcap_datalink(a);
255 #ifdef HAVE_PCAP_SET_DATALINK
257 pcap_set_datalink(pcap_t *p, int dlt)
260 return p_pcap_set_datalink(p, dlt);
265 pcap_setfilter(pcap_t *a, struct bpf_program *b)
268 return p_pcap_setfilter(a, b);
272 pcap_geterr(pcap_t *a)
275 return p_pcap_geterr(a);
279 pcap_compile(pcap_t *a, struct bpf_program *b, const char *c, int d,
283 return p_pcap_compile(a, b, c, d, e);
287 pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
290 return p_pcap_lookupnet(a, b, c, d);
294 pcap_open_live(const char *a, int b, int c, int d, char *e)
297 return p_pcap_open_live(a, b, c, d, e);
300 #ifdef HAVE_PCAP_REMOTE
302 pcap_open(const char *a, int b, int c, int d, struct pcap_rmtauth *e, char *f)
305 return p_pcap_open(a, b, c, d, e, f);
309 pcap_findalldevs_ex(char *a, struct pcap_rmtauth *b, pcap_if_t **c, char *d)
312 return p_pcap_findalldevs_ex(a, b, c, d);
316 pcap_createsrcstr(char *a, int b, const char *c, const char *d, const char *e,
320 return p_pcap_createsrcstr(a, b, c, d, e, f);
324 #ifdef HAVE_PCAP_SETSAMPLING
326 pcap_setsampling(pcap_t *a)
329 if (p_pcap_setsampling != NULL) {
330 return p_pcap_setsampling(a);
337 pcap_loop(pcap_t *a, int b, pcap_handler c, guchar *d)
340 return p_pcap_loop(a, b, c, d);
344 pcap_freecode(struct bpf_program *a)
347 if(p_pcap_freecode) {
352 #ifdef HAVE_PCAP_FINDALLDEVS
354 pcap_findalldevs(pcap_if_t **a, char *b)
356 g_assert(has_wpcap && p_pcap_findalldevs != NULL);
357 return p_pcap_findalldevs(a, b);
361 pcap_freealldevs(pcap_if_t *a)
363 g_assert(has_wpcap && p_pcap_freealldevs != NULL);
364 p_pcap_freealldevs(a);
368 #if defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
370 * Table of DLT_ types, names, and descriptions, for use if the version
371 * of WinPcap we have installed lacks "pcap_datalink_name_to_val()"
372 * or "pcap_datalink_val_to_name()".
376 const char *description;
380 #define DLT_CHOICE(code, description) { #code, description, code }
381 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
383 static struct dlt_choice dlt_choices[] = {
384 DLT_CHOICE(DLT_NULL, "BSD loopback"),
385 DLT_CHOICE(DLT_EN10MB, "Ethernet"),
386 DLT_CHOICE(DLT_IEEE802, "Token ring"),
387 DLT_CHOICE(DLT_ARCNET, "ARCNET"),
388 DLT_CHOICE(DLT_SLIP, "SLIP"),
389 DLT_CHOICE(DLT_PPP, "PPP"),
390 DLT_CHOICE(DLT_FDDI, "FDDI"),
391 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
392 DLT_CHOICE(DLT_RAW, "Raw IP"),
393 #ifdef DLT_SLIP_BSDOS
394 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
397 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
400 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
402 #ifdef DLT_PPP_SERIAL
403 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
406 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
409 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
411 #ifdef DLT_IEEE802_11
412 DLT_CHOICE(DLT_IEEE802_11, "802.11"),
415 DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
418 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
421 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
424 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
427 DLT_CHOICE(DLT_LTALK, "Localtalk"),
430 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
432 #ifdef DLT_PRISM_HEADER
433 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
435 #ifdef DLT_IP_OVER_FC
436 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
439 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
441 #ifdef DLT_IEEE802_11_RADIO
442 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radio information header"),
444 #ifdef DLT_ARCNET_LINUX
445 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
447 #ifdef DLT_LINUX_IRDA
448 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
450 #ifdef DLT_LINUX_LAPD
451 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
454 DLT_CHOICE(DLT_LANE8023, "Linux 802.3 LANE"),
457 DLT_CHOICE(DLT_CIP, "Linux Classical IP-over-ATM"),
460 DLT_CHOICE(DLT_HDLC, "Cisco HDLC"),
464 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
466 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
468 pcap_datalink_name_to_val(const char *name)
474 if (p_pcap_datalink_name_to_val != NULL)
475 return p_pcap_datalink_name_to_val(name);
478 * We don't have it in WinPcap; do it ourselves.
480 for (i = 0; dlt_choices[i].name != NULL; i++) {
481 if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
483 return dlt_choices[i].dlt;
490 #ifdef HAVE_PCAP_LIST_DATALINKS
492 pcap_list_datalinks(pcap_t *p, int **ddlt)
495 return p_pcap_list_datalinks(p, ddlt);
499 #ifdef HAVE_PCAP_FREE_DATALINKS
501 pcap_free_datalinks(int *ddlt)
506 * If we don't have pcap_free_datalinks() in WinPcap,
507 * we don't free the memory - we can't use free(), as
508 * we might not have been built with the same version
509 * of the C runtime library as WinPcap was, and, if we're
510 * not, free() isn't guaranteed to work on something
511 * allocated by WinPcap.
513 if (p_pcap_free_datalinks != NULL)
514 p_pcap_free_datalinks(ddlt);
518 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
520 pcap_datalink_val_to_name(int dlt)
526 if (p_pcap_datalink_val_to_name != NULL)
527 return p_pcap_datalink_val_to_name(dlt);
530 * We don't have it in WinPcap; do it ourselves.
532 for (i = 0; dlt_choices[i].name != NULL; i++) {
533 if (dlt_choices[i].dlt == dlt)
534 return dlt_choices[i].name + sizeof("DLT_") - 1;
541 #ifdef HAVE_PCAP_BREAKLOOP
542 void pcap_breakloop(pcap_t *a)
548 /* setbuff is win32 specific! */
549 int pcap_setbuff(pcap_t *a, int b)
552 return p_pcap_setbuff(a, b);
555 /* pcap_next_ex is available since libpcap 0.8 / WinPcap 3.0! */
556 /* (if you get a declaration warning here, try to update to at least WinPcap 3.1b4 develpack) */
557 int pcap_next_ex (pcap_t *a, struct pcap_pkthdr **b, const u_char **c)
560 return p_pcap_next_ex(a, b, c);
563 #ifdef HAVE_PCAP_REMOTE
565 get_remote_interface_list(const char *hostname, const char *port,
566 int auth_type, const char *username,
567 const char *passwd, int *err, char **err_str)
569 struct pcap_rmtauth auth;
570 char source[PCAP_BUF_SIZE];
571 char errbuf[PCAP_ERRBUF_SIZE];
574 if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
575 NULL, errbuf) == -1) {
576 *err = CANT_GET_INTERFACE_LIST;
578 *err_str = cant_get_if_list_error_message(errbuf);
582 auth.type = auth_type;
583 auth.username = g_strdup(username);
584 auth.password = g_strdup(passwd);
586 result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
587 g_free(auth.username);
588 g_free(auth.password);
595 * This will use "pcap_findalldevs()" if we have it, otherwise it'll
596 * fall back on "pcap_lookupdev()".
599 get_interface_list(int *err, char **err_str)
604 char ascii_name[MAX_WIN_IF_NAME_LEN + 1];
605 char ascii_desc[MAX_WIN_IF_NAME_LEN + 1];
607 char errbuf[PCAP_ERRBUF_SIZE];
609 #ifdef HAVE_PCAP_FINDALLDEVS
610 if (p_pcap_findalldevs != NULL)
611 return get_interface_list_findalldevs(err, err_str);
615 * In WinPcap, pcap_lookupdev is implemented by calling
616 * PacketGetAdapterNames. According to the documentation
619 * http://www.winpcap.org/docs/man/html/Packet32_8c.html#a43
623 * On Windows OT (95, 98, Me), pcap_lookupdev returns a sequence
624 * of bytes consisting of:
626 * a sequence of null-terminated ASCII strings (i.e., each
627 * one is terminated by a single 0 byte), giving the names
630 * an empty ASCII string (i.e., a single 0 byte);
632 * a sequence of null-terminated ASCII strings, giving the
633 * descriptions of the interfaces;
635 * an empty ASCII string.
637 * On Windows NT (NT 4.0, W2K, WXP, W2K3, etc.), pcap_lookupdev
638 * returns a sequence of bytes consisting of:
640 * a sequence of null-terminated double-byte Unicode strings
641 * (i.e., each one consits of a sequence of double-byte
642 * characters, terminated by a double-byte 0), giving the
643 * names of the interfaces;
645 * an empty Unicode string (i.e., a double 0 byte);
647 * a sequence of null-terminated ASCII strings, giving the
648 * descriptions of the interfaces;
650 * an empty ASCII string.
652 * The Nth string in the first sequence is the name of the Nth
653 * adapter; the Nth string in the second sequence is the
654 * description of the Nth adapter.
657 names = (wchar_t *)pcap_lookupdev(errbuf);
666 * If names[0] is less than 256 it means the first
667 * byte is 0. This implies that we are using Unicode
670 while (*(names+desc_pos) || *(names+desc_pos-1))
672 desc_pos++; /* Step over the extra '\0' */
673 desc = (char*)(names + desc_pos); /* cast *after* addition */
675 while (names[i] != 0) {
677 * Copy the Unicode description to an ASCII
682 if (j < MAX_WIN_IF_NAME_LEN)
683 ascii_desc[j++] = *desc;
686 ascii_desc[j] = '\0';
690 * Copy the Unicode name to an ASCII string.
693 while (names[i] != 0) {
694 if (j < MAX_WIN_IF_NAME_LEN)
695 ascii_name[j++] = (char) names[i++];
697 ascii_name[j] = '\0';
699 il = g_list_append(il,
700 if_info_new(ascii_name, ascii_desc));
704 * Otherwise we are in Windows 95/98 and using ASCII
705 * (8-bit) characters.
707 win95names=(char *)names;
708 while (*(win95names+desc_pos) || *(win95names+desc_pos-1))
710 desc_pos++; /* Step over the extra '\0' */
711 desc = win95names + desc_pos;
713 while (win95names[i] != '\0') {
715 * "&win95names[i]" points to the current
716 * interface name, and "desc" points to
717 * that interface's description.
719 il = g_list_append(il,
720 if_info_new(&win95names[i], desc));
723 * Skip to the next description.
730 * Skip to the next name.
732 while (win95names[i] != 0)
741 * No interfaces found.
743 *err = NO_INTERFACES_FOUND;
752 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
753 * "get_interface_list()".
756 cant_get_if_list_error_message(const char *err_str)
759 * If the error message includes "Not enough storage is available
760 * to process this command" or "The operation completed successfully",
761 * suggest that they install a WinPcap version later than 3.0.
763 if (strstr(err_str, "Not enough storage is available to process this command") != NULL ||
764 strstr(err_str, "The operation completed successfully") != NULL) {
765 return g_strdup_printf("Can't get list of interfaces: %s\n"
766 "This might be a problem with WinPcap 3.0; you should try updating to\n"
767 "a later version of WinPcap - see the WinPcap site at www.winpcap.org",
770 return g_strdup_printf("Can't get list of interfaces: %s", err_str);
774 * Append the version of WinPcap with which we were compiled to a GString.
777 get_compiled_pcap_version(GString *str)
779 g_string_append(str, "with WinPcap (version unknown)");
783 * Append the version of WinPcap with which we we're running to a GString.
786 get_runtime_pcap_version(GString *str)
789 * On Windows, we might have been compiled with WinPcap but
790 * might not have it loaded; indicate whether we have it or
791 * not and, if we have it and we have "pcap_lib_version()",
792 * what version we have.
794 GModule *handle; /* handle returned by dlopen */
795 static gchar *packetVer;
799 g_string_append_printf(str, "with ");
800 if (p_pcap_lib_version != NULL)
801 g_string_append_printf(str, p_pcap_lib_version());
804 * An alternative method of obtaining the version
805 * number, by using the PacketLibraryVersion
806 * string from packet.dll.
808 * Unfortunately, in WinPcap 3.0, it returns
809 * "3.0 alpha3", even in the final version of
810 * WinPcap 3.0, so if there's a blank in the
811 * string, we strip it and everything after
812 * it from the string, so we don't misleadingly
813 * report that 3.0 alpha3 is being used when
814 * the final version is being used.
816 if (packetVer == NULL) {
817 packetVer = "version unknown";
818 handle = g_module_open("Packet.dll", 0);
819 if (handle != NULL) {
820 if (g_module_symbol(handle,
821 "PacketLibraryVersion",
822 (gpointer*)&packetVer)) {
823 packetVer = g_strdup(packetVer);
824 blankp = strchr(packetVer, ' ');
828 packetVer = "version unknown";
830 g_module_close(handle);
833 g_string_append_printf(str, "WinPcap (%s)", packetVer);
836 g_string_append(str, "without WinPcap");
839 #else /* HAVE_LIBPCAP */
848 * Append an indication that we were not compiled with WinPcap
852 get_compiled_pcap_version(GString *str)
854 g_string_append(str, "without WinPcap");
858 * Don't append anything, as we weren't even compiled to use WinPcap.
861 get_runtime_pcap_version(GString *str _U_)
865 #endif /* HAVE_LIBPCAP */