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wireshark/ui/capture_ui_utils.c

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/* capture_ui_utils.c
* Utilities for capture user interfaces
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#ifdef HAVE_LIBPCAP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "epan/prefs.h"
#include "epan/ex-opt.h"
#include "capture/capture_ifinfo.h"
#include "ui/capture_ui_utils.h"
#include "ui/capture_globals.h"
#include "wiretap/wtap.h"
#include "epan/to_str.h"
#include "wsutil/strtoi.h"
/*
* In a list of interface information, in the form of a comma-separated
* list of {name}({property}) items, find the entry for a particular
* interface, and return a pointer a g_malloced string containing
* the property.
*/
static char *
capture_dev_get_if_property(const gchar *pref, const gchar *if_name)
{
gchar **if_tokens;
gchar *property = NULL;
int i;
if (if_name == NULL || strlen(if_name) < 1) {
return NULL;
}
if (pref == NULL || strlen(pref) < 1) {
/* There is no interface information list. */
return NULL;
}
/*
* Split the list into a sequence of items.
*
* XXX - this relies on the items not themselves containing commas.
*/
if_tokens = g_strsplit(pref, ",", -1);
for (i = 0; if_tokens[i] != NULL; i++) {
gchar *opening_parenp, *closing_parenp;
/*
* Separate this item into name and property.
* The first opening parenthesis and the last closing parenthesis
* surround the property. Any other parentheses are part of
* the property.
*/
opening_parenp = strchr(if_tokens[i], '(');
if (opening_parenp == NULL) {
/* No opening parenthesis. Give up. */
break;
}
closing_parenp = strrchr(if_tokens[i], ')');
if (closing_parenp == NULL || closing_parenp <= opening_parenp) {
/* No closing parenthesis or invalid input. Give up. */
break;
}
*opening_parenp = '\0'; /* Split {name} from what follows */
*closing_parenp = '\0'; /* Terminate {property} */
if (strcmp(if_tokens[i], if_name) == 0) {
if (strlen(opening_parenp + 1) > 0) {
property = g_strdup(opening_parenp + 1);
}
break;
}
}
g_strfreev(if_tokens);
return property;
}
/*
* Find a property that should be an integral value, and return the
* value or, if it's not found or not a valid integral value, -1.
*/
static gint
capture_dev_get_if_int_property(const gchar *pref, const gchar *if_name)
{
gchar *property_string;
gint property;
property_string = capture_dev_get_if_property(pref, if_name);
if (property_string == NULL) {
/* No property found for this interface. */
return -1;
}
if (!ws_strtoi(property_string, NULL, &property)) {
/* Syntax error or range error */
g_free(property_string);
return -1;
}
g_free(property_string);
return property;
}
/*
* Find user-specified capture device description that matches interface
* name, if any.
*/
char *
capture_dev_user_descr_find(const gchar *if_name)
{
return capture_dev_get_if_property(prefs.capture_devices_descr, if_name);
}
gint
capture_dev_user_linktype_find(const gchar *if_name)
{
return capture_dev_get_if_int_property(prefs.capture_devices_linktypes, if_name);
}
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
gint
capture_dev_user_buffersize_find(const gchar *if_name)
{
return capture_dev_get_if_int_property(prefs.capture_devices_buffersize, if_name);
}
#endif
gboolean
capture_dev_user_snaplen_find(const gchar *if_name, gboolean *hassnap, int *snaplen)
{
gboolean found = FALSE;
gchar **if_tokens;
int i;
if (if_name == NULL || strlen(if_name) < 1) {
return FALSE;
}
if ((prefs.capture_devices_snaplen == NULL) ||
(*prefs.capture_devices_snaplen == '\0')) {
/* There are no snap lengths defined */
return FALSE;
}
/*
* Split the list into a sequence of items.
*
* XXX - this relies on the items not themselves containing commas.
*/
if_tokens = g_strsplit(prefs.capture_devices_snaplen, ",", -1);
for (i = 0; if_tokens[i] != NULL; i++) {
gchar *colonp;
const gchar *next;
gint value;
/*
* This one's a bit ugly.
* The syntax of the item is {name}:{hassnap}({snaplen}),
* where {hassnap} is 0 if the interface shouldn't have a snapshot
* length and 1 if it should, and {snaplen} is the maximum snapshot
* length if {hassnap} is 0 and the specified snapshot length if
* {hassnap} is 1.
*
* Sadly, : was a bad choice of separator, given that, on some OSes,
* an interface can have a colon in its name.
*
* So we look for the *last* colon in the string.
*/
colonp = strrchr(if_tokens[i], ':');
if (colonp == NULL) {
/* No separating colon. Give up. */
break;
}
*colonp = '\0'; /* Split {name} from what follows */
if (strcmp(if_tokens[i], if_name) == 0) {
/* OK, this matches. */
if (*(colonp + 1) == '0') {
/* {hassnap} is false, so just set the snaplen to WTAP_MAX_PACKET_SIZE_STANDARD. */
found = TRUE;
*hassnap = FALSE;
*snaplen = WTAP_MAX_PACKET_SIZE_STANDARD;
} else if (*(colonp + 1) == '1') {
/* {hassnap} is true, so extract {snaplen} */
if (*(colonp + 2) != '(') {
/* Not followed by a parenthesis. Give up. */
break;
}
if (!ws_strtoi(colonp + 3, &next, &value) ||
next == colonp + 3 || *next != ')' || value < 0) {
/* Syntax error or range error. Give up. */
break;
}
found = TRUE;
*hassnap = TRUE;
*snaplen = value;
} else {
/* Bad {hassnap}. Give up. */
break;
}
break;
}
}
g_strfreev(if_tokens);
return found;
}
gboolean
capture_dev_user_pmode_find(const gchar *if_name, gboolean *pmode)
{
int value;
value = capture_dev_get_if_int_property(prefs.capture_devices_pmode, if_name);
if (value == -1) {
/* Not found or bad. */
return FALSE;
}
*pmode = (value != 0);
return TRUE;
}
gchar*
capture_dev_user_cfilter_find(const gchar *if_name)
{
return capture_dev_get_if_property(prefs.capture_devices_filter, if_name);
}
/*
* Return as descriptive a name for an interface as we can get.
* If the user has specified a comment, use that. Otherwise,
* if capture_interface_list() supplies a description, use that,
* otherwise use the interface name.
*
* The result must be g_free()'d when you're done with it.
*
* Note: given that this calls capture_interface_list(), which attempts to
* open all adapters it finds in order to check whether they can be
* captured on, this is an expensive routine to call, so don't call it
* frequently.
*/
char *
get_interface_descriptive_name(const char *if_name)
{
char *descr;
GList *if_list;
GList *if_entry;
if_info_t *if_info;
int err;
/* Do we have a user-supplied description? */
descr = capture_dev_user_descr_find(if_name);
if (descr == NULL) {
/* No; try to construct a descriptive name. */
if (strcmp(if_name, "-") == 0) {
/*
* Strictly speaking, -X (extension) options are for modules, e.g. Lua
* and using one here stretches that definition. However, this doesn't
* waste a single-letter option on something that might be rarely used
* and is backward-compatible to 1.0.
*/
descr = g_strdup(ex_opt_get_nth("stdin_descr", 0));
if (!descr) {
descr = g_strdup("Standard input");
}
} else {
/* No, we don't have a user-supplied description; did we get
one from the OS or libpcap? */
if_list = capture_interface_list(&err, NULL, NULL);
if (if_list != NULL) {
if_entry = if_list;
do {
if_info = (if_info_t *)if_entry->data;
if (strcmp(if_info->name, if_name) == 0) {
if (if_info->friendly_name != NULL) {
/* We have a "friendly name"; return a copy of that
as the description - when we free the interface
list, that'll also free up the strings to which
it refers. */
descr = g_strdup(if_info->friendly_name);
} else if (if_info->vendor_description != NULL) {
/* We have no "friendly name", but we have a vendor
description; return a copy of that - when we free
the interface list, that'll also free up the strings
to which it refers. */
descr = g_strdup(if_info->vendor_description);
}
break;
}
} while ((if_entry = g_list_next(if_entry)) != NULL);
}
free_interface_list(if_list);
if (descr == NULL) {
/* The interface name is all we have, so just return a copy of that. */
descr = g_strdup(if_name);
}
}
}
return descr;
}
GList *
build_capture_combo_list(GList *if_list, gboolean do_hide)
{
GList *combo_list;
GList *if_entry;
if_info_t *if_info;
char *if_string;
gchar *descr;
combo_list = NULL;
if (if_list != NULL) {
/* Scan through the list and build a list of strings to display. */
for (if_entry = if_list; if_entry != NULL;
if_entry = g_list_next(if_entry)) {
if_info = (if_info_t *)if_entry->data;
/* Is this interface hidden and, if so, should we include it
anyway? */
if (!prefs_is_capture_device_hidden(if_info->name) || !do_hide) {
/* It's not hidden, or it is but we should include it in the list. */
/* Do we have a user-supplied description? */
descr = capture_dev_user_descr_find(if_info->name);
if (descr != NULL) {
/* Yes, we have a user-supplied description; use it. */
if_string = ws_strdup_printf("%s: %s", descr, if_info->name);
g_free(descr);
} else {
/* No, we don't have a user-supplied description; did we get
one from the OS or libpcap? */
if (if_info->vendor_description != NULL) {
/* Yes - use it. */
if_string = ws_strdup_printf("%s: %s",
if_info->vendor_description,
if_info->name);
} else {
/* No. */
if_string = g_strdup(if_info->name);
}
}
combo_list = g_list_prepend(combo_list, if_string);
}
}/*for*/
if(combo_list){
combo_list = g_list_reverse(combo_list);
}
}
return combo_list;
}
static void
free_if_string(gpointer data, gpointer user_data _U_)
{
g_free(data);
}
void
free_capture_combo_list(GList *combo_list)
{
if (combo_list != NULL) {
g_list_foreach(combo_list, free_if_string, NULL);
g_list_free(combo_list);
}
}
/*
* Given text that contains an interface name possibly prefixed by an
* interface description, extract the interface name.
*/
const char *
get_if_name(const char *if_text)
{
const char *if_name;
#ifdef _WIN32
/*
* We cannot assume that the interface name doesn't contain a space;
* some names on Windows OT do.
*
* We also can't assume it begins with "\Device\", either, as, on
* Windows OT, WinPcap doesn't put "\Device\" in front of the name.
*
* XXX - we don't support Windows OT any more; do we need to worry
* about this?
*
* As I remember, we can't assume that the interface description
* doesn't contain a colon, either; I think some do.
*
* We can probably assume that the interface *name* doesn't contain
* a colon, however; if any interface name does contain a colon on
* Windows, it'll be time to just get rid of the damn interface
* descriptions in the drop-down list, have just the names in the
* drop-down list, and have a "Browse..." button to browse for interfaces,
* with names, descriptions, IP addresses, blah blah blah available when
* possible.
*
* So we search backwards for a colon. If we don't find it, just
* return the entire string; otherwise, skip the colon and any blanks
* after it, and return that string.
*/
if_name = if_text + strlen(if_text);
for (;;) {
if (if_name == if_text) {
/* We're at the beginning of the string; return it. */
break;
}
if_name--;
if (*if_name == ':') {
/*
* We've found a colon.
* Unfortunately, a colon is used in the string "rpcap://",
* which is used in case of a remote capture.
* So we'll check to make sure the colon isn't followed by "//";
* it'll be followed by a blank if it separates the description
* and the interface name. (We don't wire in "rpcap", in case we
* support other protocols in the same syntax.)
* Unfortunately, another colon can be used in "rpcap://host:port/"
* before port. Check if colon is followed by digit.
*/
if ((strncmp(if_name, "://", 3) != 0) && !g_ascii_isdigit(if_name[1])) {
/*
* OK, we've found a colon followed neither by "//" nor by digit.
* Skip blanks following it.
*/
if_name++;
while (*if_name == ' ')
if_name++;
break;
}
}
/* Keep looking for a colon not followed by "//". */
}
#else
/*
* There's a space between the interface description and name, and
* the interface name shouldn't have a space in it (it doesn't, on
* UNIX systems); look backwards in the string for a space.
*
* (An interface name might, however, contain a colon in it, which
* is why we don't use the colon search on UNIX.)
*/
if_name = strrchr(if_text, ' ');
if (if_name == NULL) {
if_name = if_text;
} else {
if_name++;
}
#endif
return if_name;
}
/*
* Set the active DLT for a device appropriately.
*/
void
set_active_dlt(interface_t *device, int global_default_dlt)
{
GList *list;
gboolean found_active_dlt;
link_row *link;
/*
* If there's a preference for the link-layer header type for
* this interface, use it. If not, use the all-interface
* default; if that's not set on the command line, that will
* be -1, meaning "use per-interface defaults", otherwise
* we'll fail if it's not one of the types the interface
* supports.
*/
if ((device->active_dlt = capture_dev_user_linktype_find(device->name)) == -1) {
device->active_dlt = global_default_dlt;
}
/*
* Is that one of the supported link-layer header types?
* If not, set it to -1, so we'll fall back on the first supported
* link-layer header type.
*/
found_active_dlt = FALSE;
for (list = device->links; list != NULL; list = g_list_next(list)) {
link = (link_row *)(list->data);
if (link->dlt != -1 && link->dlt == device->active_dlt) {
found_active_dlt = TRUE;
break;
}
}
if (!found_active_dlt) {
device->active_dlt = -1;
}
if (device->active_dlt == -1) {
/* Fall back on the first supported DLT, if we have one. */
for (list = device->links; list != NULL; list = g_list_next(list)) {
link = (link_row *)(list->data);
if (link->dlt != -1) {
device->active_dlt = link->dlt;
break;
}
}
}
}
GString *
get_iface_list_string(capture_options *capture_opts, guint32 style)
{
GString *iface_list_string = g_string_new("");
guint i;
/*
* If we have a descriptive name for the interface, show that,
* rather than its raw name. On NT 5.x (2K/XP/Server2K3), the
* interface name is something like "\Device\NPF_{242423..."
* which is pretty useless to the normal user. On other platforms,
* it might be less cryptic, but if a more descriptive name is
* available, we should still use that.
*/
#ifdef _WIN32
if (capture_opts->ifaces->len < 2) {
#else
if (capture_opts->ifaces->len < 4) {
#endif
for (i = 0; i < capture_opts->ifaces->len; i++) {
if (i > 0) {
if (capture_opts->ifaces->len > 2) {
g_string_append_printf(iface_list_string, ",");
}
g_string_append_printf(iface_list_string, " ");
if (i == capture_opts->ifaces->len - 1) {
g_string_append_printf(iface_list_string, "and ");
}
}
interface_options *interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i);
if (style & IFLIST_QUOTE_IF_DESCRIPTION)
g_string_append_printf(iface_list_string, "'");
if (interface_opts->display_name == NULL) {
/*
* We don't have a display name; generate one.
*/
if (interface_opts->descr == NULL) {
if (interface_opts->name != NULL)
interface_opts->descr = get_interface_descriptive_name(interface_opts->name);
else
interface_opts->descr = g_strdup("(Unknown)");
}
interface_opts->display_name = g_strdup(interface_opts->descr);
}
g_string_append_printf(iface_list_string, "%s", interface_opts->display_name);
if (style & IFLIST_QUOTE_IF_DESCRIPTION)
g_string_append_printf(iface_list_string, "'");
if (style & IFLIST_SHOW_FILTER) {
if (interface_opts->cfilter != NULL &&
strlen(interface_opts->cfilter) > 0) {
g_string_append_printf(iface_list_string, " (%s)", interface_opts->cfilter);
}
}
}
} else {
g_string_append_printf(iface_list_string, "%u interfaces", capture_opts->ifaces->len);
}
return iface_list_string;
}
#endif /* HAVE_LIBPCAP */
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