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wireshark/capture-wpcap.c
Guy Harris aa1e053ce6 If we have pcap_breakloop(), at least on UN*X we can stop the capture 
with a pcap_breakloop() call - we don't need to call select() before
calling pcap_dispatch().

Even if we do need to call select(), we don't need to supply it with a
timeout - it's OK if we block indefinitely, as the signal will interrupt
select().

That also means we can pass -1 as the count to pcap_dispatch(), as
pcap_breakloop() will terminate the loop in pcap_dispatch().

Use sigaction() to catch SIGUSR1, so we can make sure that the signal
handler doesn't get reset when the signal is delivered, and that system
calls don't restart when we return from the signal handler.

svn path=/trunk/; revision=18201
2006-05-21 21:32:04 +00:00

733 lines
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/* capture-wpcap.c
* WinPcap-specific interfaces for capturing. We load WinPcap at run
* time, so that we only need one Ethereal binary and one Tethereal 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_LIBPCAP
#include <pcap.h>
#endif
#include <glib.h>
#include <gmodule.h>
#include "capture-pcap-util.h"
#include "capture-pcap-util-int.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 *, char *, int,
bpf_u_int32);
#ifdef WPCAP_CONSTIFIED
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 *);
#else
static int (*p_pcap_lookupnet) (char *, bpf_u_int32 *, bpf_u_int32 *,
char *);
static pcap_t* (*p_pcap_open_live) (char *, int, int, int, char *);
#endif
static int (*p_pcap_loop) (pcap_t *, int, pcap_handler, guchar *);
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_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);
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_lookupnet, FALSE),
SYM(pcap_open_live, FALSE),
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_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),
{ NULL, NULL, FALSE }
};
GModule *wh; /* wpcap handle */
const symbol_table_t *sym;
wh = g_module_open("wpcap", 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;
}
char*
pcap_lookupdev (char *a)
{
g_assert(has_wpcap);
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);
}
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, char *c, int d,
bpf_u_int32 e)
{
g_assert(has_wpcap);
return p_pcap_compile(a, b, c, d, e);
}
int
#ifdef WPCAP_CONSTIFIED
pcap_lookupnet(const char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
#else
pcap_lookupnet(char *a, bpf_u_int32 *b, bpf_u_int32 *c, char *d)
#endif
{
g_assert(has_wpcap);
return p_pcap_lookupnet(a, b, c, d);
}
pcap_t*
#ifdef WPCAP_CONSTIFIED
pcap_open_live(const char *a, int b, int c, int d, char *e)
#else
pcap_open_live(char *a, int b, int c, int d, char *e)
#endif
{
g_assert(has_wpcap);
return p_pcap_open_live(a, b, c, d, e);
}
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)
/*
* 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
DLT_CHOICE_SENTINEL
};
#endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
#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 (strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
name) == 0)
return dlt_choices[i].dlt;
}
return -1;
}
}
#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_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);
}
/*
* 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;
#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(err_str);
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));
}
} 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));
/*
* 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;
}
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 (version unknown)");
}
/*
* 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 dlopen */
static gchar *packetVer;
gchar *blankp;
if (has_wpcap) {
g_string_sprintfa(str, "with ");
if (p_pcap_lib_version != NULL)
g_string_sprintfa(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 = g_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_sprintfa(str, "WinPcap (%s)", packetVer);
}
} else
g_string_append(str, "without WinPcap");
g_string_append(str, " ");
}
#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 */
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