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_DATALINK_VAL_TO_DESCRIPTION
83 static const char *(*p_pcap_datalink_val_to_description) (int);
85 #ifdef HAVE_PCAP_BREAKLOOP
86 static void (*p_pcap_breakloop) (pcap_t *);
88 static const char *(*p_pcap_lib_version) (void);
89 static int (*p_pcap_setbuff) (pcap_t *, int dim);
90 static int (*p_pcap_next_ex) (pcap_t *, struct pcap_pkthdr **pkt_header, const u_char **pkt_data);
91 #ifdef HAVE_PCAP_REMOTE
92 static pcap_t* (*p_pcap_open) (const char *, int, int, int,
93 struct pcap_rmtauth *, char *);
94 static int (*p_pcap_findalldevs_ex) (char *, struct pcap_rmtauth *,
95 pcap_if_t **, char *);
96 static int (*p_pcap_createsrcstr) (char *, int, const char *, const char *,
97 const char *, char *);
99 #ifdef HAVE_PCAP_SETSAMPLING
100 static struct pcap_samp* (*p_pcap_setsampling)(pcap_t *);
103 #ifdef HAVE_PCAP_LIST_DATALINKS
104 static int (*p_pcap_list_datalinks)(pcap_t *, int **);
107 #ifdef HAVE_PCAP_SET_DATALINK
108 static int (*p_pcap_set_datalink)(pcap_t *, int);
111 #ifdef HAVE_FREE_DATALINKS
112 static int (*p_pcap_free_datalinks)(int *);
121 #define SYM(x, y) { STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }
127 /* These are the symbols I need or want from Wpcap */
128 static const symbol_table_t symbols[] = {
129 SYM(pcap_lookupdev, FALSE),
130 SYM(pcap_close, FALSE),
131 SYM(pcap_stats, FALSE),
132 SYM(pcap_dispatch, FALSE),
133 SYM(pcap_snapshot, FALSE),
134 SYM(pcap_datalink, FALSE),
135 SYM(pcap_setfilter, FALSE),
136 SYM(pcap_geterr, FALSE),
137 SYM(pcap_compile, FALSE),
138 SYM(pcap_lookupnet, FALSE),
139 #ifdef HAVE_PCAP_REMOTE
140 SYM(pcap_open, FALSE),
141 SYM(pcap_findalldevs_ex, FALSE),
142 SYM(pcap_createsrcstr, FALSE),
144 SYM(pcap_open_live, FALSE),
146 #ifdef HAVE_PCAP_SETSAMPLING
147 SYM(pcap_setsampling, TRUE),
149 SYM(pcap_loop, FALSE),
150 SYM(pcap_freecode, TRUE),
151 #ifdef HAVE_PCAP_FINDALLDEVS
152 SYM(pcap_findalldevs, TRUE),
153 SYM(pcap_freealldevs, TRUE),
155 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
156 SYM(pcap_datalink_name_to_val, TRUE),
158 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
159 SYM(pcap_datalink_val_to_name, TRUE),
161 #ifdef HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION
162 SYM(pcap_datalink_val_to_description, TRUE),
164 #ifdef HAVE_PCAP_BREAKLOOP
166 * We don't try to work around the lack of this at
167 * run time; it's present in WinPcap 3.1, which is
168 * the version we build with and ship with.
170 SYM(pcap_breakloop, FALSE),
172 SYM(pcap_lib_version, TRUE),
173 SYM(pcap_setbuff, TRUE),
174 SYM(pcap_next_ex, TRUE),
175 #ifdef HAVE_PCAP_LIST_DATALINKS
176 SYM(pcap_list_datalinks, FALSE),
178 #ifdef HAVE_PCAP_SET_DATALINK
179 SYM(pcap_set_datalink, FALSE),
181 #ifdef HAVE_PCAP_FREE_DATALINKS
182 SYM(pcap_free_datalinks, TRUE),
184 { NULL, NULL, FALSE }
187 GModule *wh; /* wpcap handle */
188 const symbol_table_t *sym;
190 wh = g_module_open("wpcap", 0);
198 if (!g_module_symbol(wh, sym->name, sym->ptr)) {
201 * We don't care if it's missing; we just
207 * We require this symbol.
220 pcap_lookupdev (char *a)
225 return p_pcap_lookupdev(a);
229 pcap_close(pcap_t *a)
236 pcap_stats(pcap_t *a, struct pcap_stat *b)
239 return p_pcap_stats(a, b);
243 pcap_dispatch(pcap_t *a, int b, pcap_handler c, guchar *d)
246 return p_pcap_dispatch(a, b, c, d);
250 pcap_snapshot(pcap_t *a)
253 return p_pcap_snapshot(a);
257 pcap_datalink(pcap_t *a)
260 return p_pcap_datalink(a);
263 #ifdef HAVE_PCAP_SET_DATALINK
265 pcap_set_datalink(pcap_t *p, int dlt)
268 return p_pcap_set_datalink(p, dlt);
273 pcap_setfilter(pcap_t *a, struct bpf_program *b)
276 return p_pcap_setfilter(a, b);
280 pcap_geterr(pcap_t *a)
283 return p_pcap_geterr(a);
287 pcap_compile(pcap_t *a, struct bpf_program *b, const char *c, int d,
291 return p_pcap_compile(a, b, c, d, e);
295 pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
298 return p_pcap_lookupnet(a, b, c, d);
302 pcap_open_live(const char *a, int b, int c, int d, char *e)
307 return p_pcap_open_live(a, b, c, d, e);
310 #ifdef HAVE_PCAP_REMOTE
312 pcap_open(const char *a, int b, int c, int d, struct pcap_rmtauth *e, char *f)
317 return p_pcap_open(a, b, c, d, e, f);
321 pcap_findalldevs_ex(char *a, struct pcap_rmtauth *b, pcap_if_t **c, char *d)
324 return p_pcap_findalldevs_ex(a, b, c, d);
328 pcap_createsrcstr(char *a, int b, const char *c, const char *d, const char *e,
332 return p_pcap_createsrcstr(a, b, c, d, e, f);
336 #ifdef HAVE_PCAP_SETSAMPLING
338 pcap_setsampling(pcap_t *a)
341 if (p_pcap_setsampling != NULL) {
342 return p_pcap_setsampling(a);
349 pcap_loop(pcap_t *a, int b, pcap_handler c, guchar *d)
352 return p_pcap_loop(a, b, c, d);
356 pcap_freecode(struct bpf_program *a)
359 if(p_pcap_freecode) {
364 #ifdef HAVE_PCAP_FINDALLDEVS
366 pcap_findalldevs(pcap_if_t **a, char *b)
368 g_assert(has_wpcap && p_pcap_findalldevs != NULL);
369 return p_pcap_findalldevs(a, b);
373 pcap_freealldevs(pcap_if_t *a)
375 g_assert(has_wpcap && p_pcap_freealldevs != NULL);
376 p_pcap_freealldevs(a);
380 #if defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
382 * Table of DLT_ types, names, and descriptions, for use if the version
383 * of WinPcap we have installed lacks "pcap_datalink_name_to_val()"
384 * or "pcap_datalink_val_to_name()".
388 const char *description;
392 #define DLT_CHOICE(code, description) { #code, description, code }
393 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
395 static struct dlt_choice dlt_choices[] = {
396 DLT_CHOICE(DLT_NULL, "BSD loopback"),
397 DLT_CHOICE(DLT_EN10MB, "Ethernet"),
398 DLT_CHOICE(DLT_IEEE802, "Token ring"),
399 DLT_CHOICE(DLT_ARCNET, "ARCNET"),
400 DLT_CHOICE(DLT_SLIP, "SLIP"),
401 DLT_CHOICE(DLT_PPP, "PPP"),
402 DLT_CHOICE(DLT_FDDI, "FDDI"),
403 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
404 DLT_CHOICE(DLT_RAW, "Raw IP"),
405 #ifdef DLT_SLIP_BSDOS
406 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
409 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
412 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
414 #ifdef DLT_PPP_SERIAL
415 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
418 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
421 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
423 #ifdef DLT_IEEE802_11
424 DLT_CHOICE(DLT_IEEE802_11, "802.11"),
427 DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
430 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
433 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
436 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
439 DLT_CHOICE(DLT_LTALK, "Localtalk"),
442 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
444 #ifdef DLT_PRISM_HEADER
445 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
447 #ifdef DLT_IP_OVER_FC
448 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
451 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
453 #ifdef DLT_IEEE802_11_RADIO
454 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radio information header"),
456 #ifdef DLT_ARCNET_LINUX
457 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
459 #ifdef DLT_LINUX_IRDA
460 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
462 #ifdef DLT_LINUX_LAPD
463 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
466 DLT_CHOICE(DLT_LANE8023, "Linux 802.3 LANE"),
469 DLT_CHOICE(DLT_CIP, "Linux Classical IP-over-ATM"),
472 DLT_CHOICE(DLT_HDLC, "Cisco HDLC"),
475 DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
479 #endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION */
481 #ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
483 pcap_datalink_name_to_val(const char *name)
489 if (p_pcap_datalink_name_to_val != NULL)
490 return p_pcap_datalink_name_to_val(name);
493 * We don't have it in WinPcap; do it ourselves.
495 for (i = 0; dlt_choices[i].name != NULL; i++) {
496 if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
498 return dlt_choices[i].dlt;
505 #ifdef HAVE_PCAP_LIST_DATALINKS
507 pcap_list_datalinks(pcap_t *p, int **ddlt)
510 return p_pcap_list_datalinks(p, ddlt);
514 #ifdef HAVE_PCAP_FREE_DATALINKS
516 pcap_free_datalinks(int *ddlt)
521 * If we don't have pcap_free_datalinks() in WinPcap,
522 * we don't free the memory - we can't use free(), as
523 * we might not have been built with the same version
524 * of the C runtime library as WinPcap was, and, if we're
525 * not, free() isn't guaranteed to work on something
526 * allocated by WinPcap.
528 if (p_pcap_free_datalinks != NULL)
529 p_pcap_free_datalinks(ddlt);
533 #ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
535 pcap_datalink_val_to_name(int dlt)
541 if (p_pcap_datalink_val_to_name != NULL)
542 return p_pcap_datalink_val_to_name(dlt);
545 * We don't have it in WinPcap; do it ourselves.
547 for (i = 0; dlt_choices[i].name != NULL; i++) {
548 if (dlt_choices[i].dlt == dlt)
549 return dlt_choices[i].name + sizeof("DLT_") - 1;
556 #ifdef HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION
558 pcap_datalink_val_to_description(int dlt)
564 if (p_pcap_datalink_val_to_description != NULL)
565 return p_pcap_datalink_val_to_description(dlt);
568 * We don't have it in WinPcap; do it ourselves.
570 for (i = 0; dlt_choices[i].name != NULL; i++) {
571 if (dlt_choices[i].dlt == dlt)
572 return (dlt_choices[i].description);
579 #ifdef HAVE_PCAP_BREAKLOOP
580 void pcap_breakloop(pcap_t *a)
586 /* setbuff is win32 specific! */
587 int pcap_setbuff(pcap_t *a, int b)
590 return p_pcap_setbuff(a, b);
593 /* pcap_next_ex is available since libpcap 0.8 / WinPcap 3.0! */
594 /* (if you get a declaration warning here, try to update to at least WinPcap 3.1b4 develpack) */
595 int pcap_next_ex (pcap_t *a, struct pcap_pkthdr **b, const u_char **c)
598 return p_pcap_next_ex(a, b, c);
601 #ifdef HAVE_PCAP_REMOTE
603 get_remote_interface_list(const char *hostname, const char *port,
604 int auth_type, const char *username,
605 const char *passwd, int *err, char **err_str)
607 struct pcap_rmtauth auth;
608 char source[PCAP_BUF_SIZE];
609 char errbuf[PCAP_ERRBUF_SIZE];
612 if (pcap_createsrcstr(source, PCAP_SRC_IFREMOTE, hostname, port,
613 NULL, errbuf) == -1) {
614 *err = CANT_GET_INTERFACE_LIST;
616 *err_str = cant_get_if_list_error_message(errbuf);
620 auth.type = auth_type;
621 auth.username = g_strdup(username);
622 auth.password = g_strdup(passwd);
624 result = get_interface_list_findalldevs_ex(source, &auth, err, err_str);
625 g_free(auth.username);
626 g_free(auth.password);
633 * This will use "pcap_findalldevs()" if we have it, otherwise it'll
634 * fall back on "pcap_lookupdev()".
637 get_interface_list(int *err, char **err_str)
642 char ascii_name[MAX_WIN_IF_NAME_LEN + 1];
643 char ascii_desc[MAX_WIN_IF_NAME_LEN + 1];
645 char errbuf[PCAP_ERRBUF_SIZE];
647 #ifdef HAVE_PCAP_FINDALLDEVS
648 if (p_pcap_findalldevs != NULL)
649 return get_interface_list_findalldevs(err, err_str);
653 * In WinPcap, pcap_lookupdev is implemented by calling
654 * PacketGetAdapterNames. According to the documentation
657 * http://www.winpcap.org/docs/man/html/Packet32_8c.html#a43
661 * On Windows OT (95, 98, Me), pcap_lookupdev returns a sequence
662 * of bytes consisting of:
664 * a sequence of null-terminated ASCII strings (i.e., each
665 * one is terminated by a single 0 byte), giving the names
668 * an empty ASCII string (i.e., a single 0 byte);
670 * a sequence of null-terminated ASCII strings, giving the
671 * descriptions of the interfaces;
673 * an empty ASCII string.
675 * On Windows NT (NT 4.0, W2K, WXP, W2K3, etc.), pcap_lookupdev
676 * returns a sequence of bytes consisting of:
678 * a sequence of null-terminated double-byte Unicode strings
679 * (i.e., each one consits of a sequence of double-byte
680 * characters, terminated by a double-byte 0), giving the
681 * names of the interfaces;
683 * an empty Unicode string (i.e., a double 0 byte);
685 * a sequence of null-terminated ASCII strings, giving the
686 * descriptions of the interfaces;
688 * an empty ASCII string.
690 * The Nth string in the first sequence is the name of the Nth
691 * adapter; the Nth string in the second sequence is the
692 * description of the Nth adapter.
695 names = (wchar_t *)pcap_lookupdev(errbuf);
704 * If names[0] is less than 256 it means the first
705 * byte is 0. This implies that we are using Unicode
708 while (*(names+desc_pos) || *(names+desc_pos-1))
710 desc_pos++; /* Step over the extra '\0' */
711 desc = (char*)(names + desc_pos); /* cast *after* addition */
713 while (names[i] != 0) {
715 * Copy the Unicode description to an ASCII
720 if (j < MAX_WIN_IF_NAME_LEN)
721 ascii_desc[j++] = *desc;
724 ascii_desc[j] = '\0';
728 * Copy the Unicode name to an ASCII string.
731 while (names[i] != 0) {
732 if (j < MAX_WIN_IF_NAME_LEN)
733 ascii_name[j++] = (char) names[i++];
735 ascii_name[j] = '\0';
737 il = g_list_append(il,
738 if_info_new(ascii_name, ascii_desc));
742 * Otherwise we are in Windows 95/98 and using ASCII
743 * (8-bit) characters.
745 win95names=(char *)names;
746 while (*(win95names+desc_pos) || *(win95names+desc_pos-1))
748 desc_pos++; /* Step over the extra '\0' */
749 desc = win95names + desc_pos;
751 while (win95names[i] != '\0') {
753 * "&win95names[i]" points to the current
754 * interface name, and "desc" points to
755 * that interface's description.
757 il = g_list_append(il,
758 if_info_new(&win95names[i], desc));
761 * Skip to the next description.
768 * Skip to the next name.
770 while (win95names[i] != 0)
779 * No interfaces found.
781 *err = NO_INTERFACES_FOUND;
790 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
791 * "get_interface_list()".
794 cant_get_if_list_error_message(const char *err_str)
797 * If the error message includes "Not enough storage is available
798 * to process this command" or "The operation completed successfully",
799 * suggest that they install a WinPcap version later than 3.0.
801 if (strstr(err_str, "Not enough storage is available to process this command") != NULL ||
802 strstr(err_str, "The operation completed successfully") != NULL) {
803 return g_strdup_printf("Can't get list of interfaces: %s\n"
804 "This might be a problem with WinPcap 3.0; you should try updating to\n"
805 "a later version of WinPcap - see the WinPcap site at www.winpcap.org",
808 return g_strdup_printf("Can't get list of interfaces: %s", err_str);
812 * Append the version of WinPcap with which we were compiled to a GString.
815 get_compiled_pcap_version(GString *str)
817 g_string_append(str, "with WinPcap (version unknown)");
821 * Append the version of WinPcap with which we we're running to a GString.
824 get_runtime_pcap_version(GString *str)
827 * On Windows, we might have been compiled with WinPcap but
828 * might not have it loaded; indicate whether we have it or
829 * not and, if we have it and we have "pcap_lib_version()",
830 * what version we have.
832 GModule *handle; /* handle returned by dlopen */
833 static gchar *packetVer;
837 g_string_append_printf(str, "with ");
838 if (p_pcap_lib_version != NULL)
839 g_string_append_printf(str, p_pcap_lib_version());
842 * An alternative method of obtaining the version
843 * number, by using the PacketLibraryVersion
844 * string from packet.dll.
846 * Unfortunately, in WinPcap 3.0, it returns
847 * "3.0 alpha3", even in the final version of
848 * WinPcap 3.0, so if there's a blank in the
849 * string, we strip it and everything after
850 * it from the string, so we don't misleadingly
851 * report that 3.0 alpha3 is being used when
852 * the final version is being used.
854 if (packetVer == NULL) {
855 packetVer = "version unknown";
856 handle = g_module_open("Packet.dll", 0);
857 if (handle != NULL) {
858 if (g_module_symbol(handle,
859 "PacketLibraryVersion",
860 (gpointer*)&packetVer)) {
861 packetVer = g_strdup(packetVer);
862 blankp = strchr(packetVer, ' ');
866 packetVer = "version unknown";
868 g_module_close(handle);
871 g_string_append_printf(str, "WinPcap (%s)", packetVer);
874 g_string_append(str, "without WinPcap");
877 #else /* HAVE_LIBPCAP */
886 * Append an indication that we were not compiled with WinPcap
890 get_compiled_pcap_version(GString *str)
892 g_string_append(str, "without WinPcap");
896 * Don't append anything, as we weren't even compiled to use WinPcap.
899 get_runtime_pcap_version(GString *str _U_)
903 #endif /* HAVE_LIBPCAP */