/* color_filters.c

* Routines for color filters

*

* $Id: color_filters.c 53769 2013-12-03 22:16:49Z darkjames $

*

* Wireshark - Network traffic analyzer

* By Gerald Combs <gerald@wireshark.org>

* Copyright 1998 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

/*

* Updated 1 Dec 10 jjm

*/

#include "config.h"

#include <glib.h>

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <string.h>

#include <wsutil/filesystem.h>

#include <wsutil/file_util.h>

#include <epan/packet.h>

#include "color.h"

#include "color_filters.h"

#include "file.h"

#include <epan/dfilter/dfilter.h>

#include <epan/prefs.h>

#include "ui/simple_dialog.h"

#include "ui/ui_util.h"

#define RED_COMPONENT(x) (guint16) (((((x) >> 16) & 0xff) * 65535 / 255))

#define GREEN_COMPONENT(x) (guint16) (((((x) >> 8) & 0xff) * 65535 / 255))

#define BLUE_COMPONENT(x) (guint16) ( (((x) & 0xff) * 65535 / 255))

static gboolean read_users_filters(GSList **cfl);

/* the currently active filters */

static GSList *color_filter_list = NULL;

/* keep "old" deleted filters in this list until

* the dissection no longer needs them (e.g. file is closed) */

static GSList *color_filter_deleted_list = NULL;

static GSList *color_filter_valid_list = NULL;

/* Color Filters can en-/disabled. */

static gboolean filters_enabled = TRUE;

/* Remember if there are temporary coloring filters set to

* add sensitivity to the "Reset Coloring 1-10" menu item

*/

static gboolean tmp_colors_set = FALSE;

/* Create a new filter */

color_filter_t *

color_filter_new(const gchar *name, /* The name of the filter to create */

gboolean disabled) /* Is the filter disabled? */

{

color_filter_t *colorf;

colorf = (color_filter_t *)g_malloc(sizeof (color_filter_t));

colorf->filter_name = g_strdup(name);

colorf->filter_text = g_strdup(filter_string);

colorf->bg_color = *bg_color;

colorf->fg_color = *fg_color;

colorf->disabled = disabled;

colorf->c_colorfilter = NULL;

colorf->color_edit_dlg_info = NULL;

colorf->selected = FALSE;

return colorf;

}

/* Add ten empty (temporary) colorfilters for easy coloring */

static void

color_filters_add_tmp(GSList **cfl)

{

gchar *name = NULL;

guint32 i;

gchar** bg_colors;

gchar** fg_colors;

gulong cval;

color_t bg_color, fg_color;

color_filter_t *colorf;

g_assert(strlen(prefs.gui_colorized_fg)==69);

g_assert(strlen(prefs.gui_colorized_bg)==69);

fg_colors = g_strsplit(prefs.gui_colorized_fg, ",", -1);

bg_colors = g_strsplit(prefs.gui_colorized_bg, ",", -1);

for ( i=1 ; i<=10 ; i++ ) {

name = g_strdup_printf("%s%02d",CONVERSATION_COLOR_PREFIX,i);

/* retrieve background and foreground colors */

cval = strtoul(fg_colors[i-1], NULL, 16);

initialize_color(&fg_color, RED_COMPONENT(cval),

GREEN_COMPONENT(cval),

BLUE_COMPONENT(cval) );

cval = strtoul(bg_colors[i-1], NULL, 16);

initialize_color(&bg_color, RED_COMPONENT(cval),

GREEN_COMPONENT(cval),

BLUE_COMPONENT(cval) );

colorf = color_filter_new(name, NULL, &bg_color, &fg_color, TRUE);

colorf->filter_text = g_strdup("frame");

colorf->c_colorfilter = NULL;

*cfl = g_slist_append(*cfl, colorf);

g_free(name);

}

g_strfreev(fg_colors);

g_strfreev(bg_colors);

return;

}

static gint

color_filters_find_by_name_cb(gconstpointer arg1, gconstpointer arg2)

{

const color_filter_t *colorf = (const color_filter_t *)arg1;

const gchar *name = (const gchar *)arg2;

return (strstr(colorf->filter_name, name)==NULL) ? -1 : 0 ;

}

/* Set the filter off a temporary colorfilters and enable it */

void

color_filters_set_tmp(guint8 filt_nr, gchar *filter, gboolean disabled)

{

gchar *name = NULL;

const gchar *tmpfilter = NULL;

GSList *cfl;

color_filter_t *colorf;

dfilter_t *compiled_filter;

guint8 i;

/* Go through the tomporary filters and look for the same filter string.

* If found, clear it so that a filter can be "moved" up and down the list

*/

for ( i=1 ; i<=10 ; i++ ) {

/* If we need to reset the temporary filter (filter==NULL), don't look

* for other rules with the same filter string

*/

if( i!=filt_nr && filter==NULL )

continue;

name = g_strdup_printf("%s%02d",CONVERSATION_COLOR_PREFIX,i);

cfl = g_slist_find_custom(color_filter_list, name, color_filters_find_by_name_cb);

colorf = (color_filter_t *)cfl->data;

/* Only change the filter rule if this is the rule to change or if

* a matching filter string has been found

*/

if(colorf && ( (i==filt_nr) || (strstr(filter,colorf->filter_text)!=NULL) ) ) {

/* set filter string to "frame" if we are resetting the rules

* or if we found a matching filter string which need to be cleared

*/

tmpfilter = ( (filter==NULL) || (i!=filt_nr) ) ? "frame" : filter;

if (!dfilter_compile(tmpfilter, &compiled_filter)) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not compile color filter name: \"%s\""

" text: \"%s\".\n%s", name, filter, dfilter_error_msg);

} else {

if (colorf->filter_text != NULL)

g_free(colorf->filter_text);

if (colorf->c_colorfilter != NULL)

dfilter_free(colorf->c_colorfilter);

colorf->filter_text = g_strdup(tmpfilter);

colorf->c_colorfilter = compiled_filter;

colorf->disabled = ((i!=filt_nr) ? TRUE : disabled);

/* Remember that there are now temporary coloring filters set */

if( filter )

tmp_colors_set = TRUE;

}

}

g_free(name);

}

return;

}

/* Reset the temporary colorfilters */

void

color_filters_reset_tmp(void)

{

guint8 i;

for ( i=1 ; i<=10 ; i++ ) {

color_filters_set_tmp(i, NULL, TRUE);

}

/* Remember that there are now *no* temporary coloring filters set */

tmp_colors_set = FALSE;

return;

}

/* delete the specified filter */

void

color_filter_delete(color_filter_t *colorf)

{

if (colorf->filter_name != NULL)

g_free(colorf->filter_name);

if (colorf->filter_text != NULL)

g_free(colorf->filter_text);

if (colorf->c_colorfilter != NULL)

dfilter_free(colorf->c_colorfilter);

g_free(colorf);

}

/* delete the specified filter (called from g_slist_foreach) */

static void

color_filter_delete_cb(gpointer filter_arg, gpointer unused _U_)

{

color_filter_t *colorf = (color_filter_t *)filter_arg;

color_filter_delete(colorf);

}

/* delete the specified list */

void

color_filter_list_delete(GSList **cfl)

{

g_slist_foreach(*cfl, color_filter_delete_cb, NULL);

g_slist_free(*cfl);

*cfl = NULL;

}

/* clone a single list entries from normal to edit list */

static color_filter_t *

color_filter_clone(color_filter_t *colorf)

{

color_filter_t *new_colorf;

new_colorf = (color_filter_t *)g_malloc(sizeof (color_filter_t));

new_colorf->filter_name = g_strdup(colorf->filter_name);

new_colorf->filter_text = g_strdup(colorf->filter_text);

new_colorf->bg_color = colorf->bg_color;

new_colorf->fg_color = colorf->fg_color;

new_colorf->disabled = colorf->disabled;

new_colorf->c_colorfilter = NULL;

new_colorf->color_edit_dlg_info = NULL;

new_colorf->selected = FALSE;

return new_colorf;

}

static void

color_filter_list_clone_cb(gpointer filter_arg, gpointer cfl_arg)

{

GSList **cfl = (GSList **)cfl_arg;

color_filter_t *new_colorf;

new_colorf = color_filter_clone((color_filter_t *)filter_arg);

*cfl = g_slist_append(*cfl, new_colorf);

}

/* clone the specified list */

static GSList *

color_filter_list_clone(GSList *cfl)

{

GSList *new_list = NULL;

g_slist_foreach(cfl, color_filter_list_clone_cb, &new_list);

return new_list;

}

/* Initialize the filter structures (reading from file) for general running, including app startup */

void

color_filters_init(void)

{

/* delete all currently existing filters */

color_filter_list_delete(&color_filter_list);

/* start the list with the temporary colorizing rules */

color_filters_add_tmp(&color_filter_list);

/* try to read the users filters */

if (!read_users_filters(&color_filter_list))

/* if that failed, try to read the global filters */

color_filters_read_globals(&color_filter_list);

}

void

color_filters_reload(void)

{

/* "move" old entries to the deleted list

* we must keep them until the dissection no longer needs them */

color_filter_deleted_list = g_slist_concat(color_filter_deleted_list, color_filter_list);

color_filter_list = NULL;

/* start the list with the temporary colorizing rules */

color_filters_add_tmp(&color_filter_list);

/* try to read the users filters */

if (!read_users_filters(&color_filter_list))

/* if that failed, try to read the global filters */

color_filters_read_globals(&color_filter_list);

}

void

color_filters_cleanup(void)

{

/* delete the previously deleted filters */

color_filter_list_delete(&color_filter_deleted_list);

}

static void

color_filters_clone_cb(gpointer filter_arg, gpointer user_data)

{

color_filter_t * new_colorf = color_filter_clone((color_filter_t *)filter_arg);

color_filter_add_cb (new_colorf, user_data);

}

void

color_filters_clone(gpointer user_data)

{

g_slist_foreach(color_filter_list, color_filters_clone_cb, user_data);

}

static void

color_filter_compile_cb(gpointer filter_arg, gpointer unused _U_)

{

color_filter_t *colorf = (color_filter_t *)filter_arg;

g_assert(colorf->c_colorfilter == NULL);

if (!dfilter_compile(colorf->filter_text, &colorf->c_colorfilter)) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not compile color filter name: \"%s\" text: \"%s\".\n%s",

colorf->filter_name, colorf->filter_text, dfilter_error_msg);

/* this filter was compilable before, so this should never happen */

/* except if the OK button of the parent window has been clicked */

/* so don't use g_assert_not_reached() but check the filters again */

}

}

static void

color_filter_validate_cb(gpointer filter_arg, gpointer unused _U_)

{

color_filter_t *colorf = (color_filter_t *)filter_arg;

g_assert(colorf->c_colorfilter == NULL);

if (!dfilter_compile(colorf->filter_text, &colorf->c_colorfilter)) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Removing color filter name: \"%s\" text: \"%s\".\n%s",

colorf->filter_name, colorf->filter_text, dfilter_error_msg);

/* Delete the color filter from the list of color filters. */

color_filter_valid_list = g_slist_remove(color_filter_valid_list, colorf);

color_filter_delete(colorf);

}

}

/* apply changes from the edit list */

void

color_filters_apply(GSList *tmp_cfl, GSList *edit_cfl)

{

/* "move" old entries to the deleted list

* we must keep them until the dissection no longer needs them */

color_filter_deleted_list = g_slist_concat(color_filter_deleted_list, color_filter_list);

color_filter_list = NULL;

/* clone all list entries from tmp/edit to normal list */

color_filter_valid_list = NULL;

color_filter_valid_list = color_filter_list_clone(tmp_cfl);

color_filter_valid_list = g_slist_concat(color_filter_valid_list,

color_filter_list_clone(edit_cfl) );

/* compile all filter */

g_slist_foreach(color_filter_valid_list, color_filter_validate_cb, NULL);

/* clone all list entries from tmp/edit to normal list */

color_filter_list = color_filter_list_clone(color_filter_valid_list);

/* compile all filter */

g_slist_foreach(color_filter_list, color_filter_compile_cb, NULL);

}

gboolean

color_filters_used(void)

{

return color_filter_list != NULL && filters_enabled;

}

gboolean

tmp_color_filters_used(void)

{

return tmp_colors_set;

}

void

color_filters_enable(gboolean enable)

{

packet_list_enable_color(enable);

}

/* prepare the epan_dissect_t for the filter */

static void

prime_edt(gpointer data, gpointer user_data)

{

color_filter_t *colorf = (color_filter_t *)data;

epan_dissect_t *edt = (epan_dissect_t *)user_data;

if (colorf->c_colorfilter != NULL)

epan_dissect_prime_dfilter(edt, colorf->c_colorfilter);

}

/* Prime the epan_dissect_t with all the compiler

* color filters in 'color_filter_list'. */

void

color_filters_prime_edt(epan_dissect_t *edt)

{

if (color_filters_used())

g_slist_foreach(color_filter_list, prime_edt, edt);

}

/* * Return the color_t for later use */

const color_filter_t *

color_filters_colorize_packet(epan_dissect_t *edt)

{

GSList *curr;

color_filter_t *colorf;

/* If we have color filters, "search" for the matching one. */

if (color_filters_used()) {

curr = color_filter_list;

while(curr != NULL) {

colorf = (color_filter_t *)curr->data;

if ( (!colorf->disabled) &&

(colorf->c_colorfilter != NULL) &&

dfilter_apply_edt(colorf->c_colorfilter, edt)) {

return colorf;

}

curr = g_slist_next(curr);

}

}

return NULL;

}

/* read filters from the given file */

/* XXX - Would it make more sense to use GStrings here instead of reallocing

our buffers? */

static gboolean

read_filters_file(FILE *f, gpointer user_data)

{

#define INIT_BUF_SIZE 128

gchar *name = NULL;

gchar *filter_exp = NULL;

guint32 name_len = INIT_BUF_SIZE;

guint32 filter_exp_len = INIT_BUF_SIZE;

guint32 i = 0;

gint32 c;

guint16 fg_r, fg_g, fg_b, bg_r, bg_g, bg_b;

gboolean disabled = FALSE;

gboolean skip_end_of_line = FALSE;

name = (gchar *)g_malloc(name_len + 1);

filter_exp = (gchar *)g_malloc(filter_exp_len + 1);

while (1) {

if (skip_end_of_line) {

do {

c = getc(f);

} while (c != EOF && c != '\n');

if (c == EOF)

break;

disabled = FALSE;

skip_end_of_line = FALSE;

}

while ((c = getc(f)) != EOF && isspace(c)) {

if (c == '\n') {

continue;

}

}

if (c == EOF)

break;

if (c == '!') {

disabled = TRUE;

continue;

}

/* skip # comments and invalid lines */

if (c != '@') {

skip_end_of_line = TRUE;

continue;

}

/* we get the @ delimiter.

* Format is:

* @name@filter expression@[background r,g,b][foreground r,g,b]

*/

/* retrieve name */

i = 0;

while (1) {

c = getc(f);

if (c == EOF || c == '@')

break;

if (i >= name_len) {

/* buffer isn't long enough; double its length.*/

name_len *= 2;

name = (gchar *)g_realloc(name, name_len + 1);

}

name[i++] = c;

}

name[i] = '\0';

if (c == EOF) {

break;

} else if (i == 0) {

skip_end_of_line = TRUE;

continue;

}

/* retrieve filter expression */

i = 0;

while (1) {

c = getc(f);

if (c == EOF || c == '@')

break;

if (i >= filter_exp_len) {

/* buffer isn't long enough; double its length.*/

filter_exp_len *= 2;

filter_exp = (gchar *)g_realloc(filter_exp, filter_exp_len + 1);

}

filter_exp[i++] = c;

}

filter_exp[i] = '\0';

if (c == EOF) {

break;

} else if (i == 0) {

skip_end_of_line = TRUE;

continue;

}

/* retrieve background and foreground colors */

if (fscanf(f,"[%hu,%hu,%hu][%hu,%hu,%hu]",

&bg_r, &bg_g, &bg_b, &fg_r, &fg_g, &fg_b) == 6) {

/* we got a complete color filter */

color_t bg_color, fg_color;

color_filter_t *colorf;

dfilter_t *temp_dfilter;

if (!dfilter_compile(filter_exp, &temp_dfilter)) {

g_warning("Could not compile \"%s\" in colorfilters file.\n%s",

name, dfilter_error_msg);

prefs.unknown_colorfilters = TRUE;

skip_end_of_line = TRUE;

continue;

}

if (!initialize_color(&fg_color, fg_r, fg_g, fg_b)) {

/* oops */

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not allocate foreground color "

"specified in input file for %s.", name);

dfilter_free(temp_dfilter);

skip_end_of_line = TRUE;

continue;

}

if (!initialize_color(&bg_color, bg_r, bg_g, bg_b)) {

/* oops */

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not allocate background color "

"specified in input file for %s.", name);

dfilter_free(temp_dfilter);

skip_end_of_line = TRUE;

continue;

}

colorf = color_filter_new(name, filter_exp, &bg_color,

&fg_color, disabled);

if(user_data == &color_filter_list) {

GSList **cfl = (GSList **)user_data;

/* internal call */

colorf->c_colorfilter = temp_dfilter;

*cfl = g_slist_append(*cfl, colorf);

} else {

/* external call */

/* just editing, don't need the compiled filter */

dfilter_free(temp_dfilter);

color_filter_add_cb (colorf, user_data);

}

} /* if sscanf */

skip_end_of_line = TRUE;

}

g_free(name);

g_free(filter_exp);

return TRUE;

}

/* read filters from the user's filter file */

static gboolean

read_users_filters(GSList **cfl)

{

gchar *path;

FILE *f;

gboolean ret;

/* decide what file to open (from dfilter code) */

path = get_persconffile_path("colorfilters", TRUE);

if ((f = ws_fopen(path, "r")) == NULL) {

if (errno != ENOENT) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not open filter file\n\"%s\": %s.", path,

g_strerror(errno));

}

g_free(path);

return FALSE;

}

g_free(path);

path = NULL;

ret = read_filters_file(f, cfl);

fclose(f);

return ret;

}

/* read filters from the filter file */

gboolean

color_filters_read_globals(gpointer user_data)

{

gchar *path;

FILE *f;

gboolean ret;

/* decide what file to open (from dfilter code) */

path = get_datafile_path("colorfilters");

if ((f = ws_fopen(path, "r")) == NULL) {

if (errno != ENOENT) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not open global filter file\n\"%s\": %s.", path,

g_strerror(errno));

}

g_free(path);

return FALSE;

}

g_free(path);

path = NULL;

ret = read_filters_file(f, user_data);

fclose(f);

return ret;

}

/* read filters from some other filter file (import) */

gboolean

color_filters_import(gchar *path, gpointer user_data)

{

FILE *f;

gboolean ret;

if ((f = ws_fopen(path, "r")) == NULL) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not open\n%s\nfor reading: %s.",

path, g_strerror(errno));

return FALSE;

}

ret = read_filters_file(f, user_data);

fclose(f);

return ret;

}

struct write_filter_data

};

/* save a single filter */

static void

write_filter(gpointer filter_arg, gpointer data_arg)

{

struct write_filter_data *data = (struct write_filter_data *)data_arg;

color_filter_t *colorf = (color_filter_t *)filter_arg;

FILE *f = data->f;

if ( (colorf->selected || !data->only_selected) &&

(strstr(colorf->filter_name,CONVERSATION_COLOR_PREFIX)==NULL) ) {

fprintf(f,"%s@%s@%s@[%d,%d,%d][%d,%d,%d]\n",

colorf->disabled ? "!" : "",

colorf->filter_name,

colorf->filter_text,

colorf->bg_color.red,

colorf->bg_color.green,

colorf->bg_color.blue,

colorf->fg_color.red,

colorf->fg_color.green,

colorf->fg_color.blue);

}

}

/* save filters in a filter file */

static gboolean

write_filters_file(GSList *cfl, FILE *f, gboolean only_selected)

{

struct write_filter_data data;

data.f = f;

data.only_selected = only_selected;

fprintf(f,"# DO NOT EDIT THIS FILE! It was created by Wireshark\n");

g_slist_foreach(cfl, write_filter, &data);

return TRUE;

}

/* save filters in users filter file */

gboolean

color_filters_write(GSList *cfl)

{

gchar *pf_dir_path;

gchar *path;

FILE *f;

/* Create the directory that holds personal configuration files,

if necessary. */

if (create_persconffile_dir(&pf_dir_path) == -1) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Can't create directory\n\"%s\"\nfor color files: %s.",

pf_dir_path, g_strerror(errno));

g_free(pf_dir_path);

return FALSE;

}

path = get_persconffile_path("colorfilters", TRUE);

if ((f = ws_fopen(path, "w+")) == NULL) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not open\n%s\nfor writing: %s.",

path, g_strerror(errno));

g_free(path);

return FALSE;

}

g_free(path);

write_filters_file(cfl, f, FALSE);

fclose(f);

return TRUE;

}

/* save filters in some other filter file (export) */

gboolean

color_filters_export(gchar *path, GSList *cfl, gboolean only_marked)

{

FILE *f;

if ((f = ws_fopen(path, "w+")) == NULL) {

simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,

"Could not open\n%s\nfor writing: %s.",

path, g_strerror(errno));

return FALSE;

}

write_filters_file(cfl, f, only_marked);

fclose(f);

return TRUE;

}

/*

* Editor modelines - http://www.wireshark.org/tools/modelines.html

*

* Local variables:

* c-basic-offset: 4

* tab-width: 8

* indent-tabs-mode: nil

* End:

*

* vi: set shiftwidth=4 tabstop=8 expandtab:

* :indentSize=4:tabSize=8:noTabs=true:

*/