forked from osmocom/wireshark
386 lines
8.9 KiB
C
386 lines
8.9 KiB
C
/* filters.c
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* Code for reading and writing the filters file.
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*
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* $Id: filters.c,v 1.4 2001/01/28 22:28:31 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_DIRECT_H
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#include <direct.h> /* to declare "mkdir()" on Windows */
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#endif
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#include <glib.h>
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#include <epan.h>
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#include "filters.h"
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#include "util.h"
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/*
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* Old filter file name.
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*/
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#define FILTER_FILE_NAME "filters"
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/*
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* Capture filter file name.
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*/
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#define CFILTER_FILE_NAME "cfilters"
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/*
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* Display filter file name.
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*/
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#define DFILTER_FILE_NAME "dfilters"
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#define FILTER_LINE_SIZE 2048
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/*
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* List of capture filters.
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*/
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static GList *capture_filters = NULL;
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/*
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* List of display filters.
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*/
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static GList *display_filters = NULL;
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/*
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* Read in a list of filters.
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*
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* On success, "*pref_path_return" is set to NULL.
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* On error, "*pref_path_return" is set to point to the pathname of
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* the file we tried to read - it should be freed by our caller -
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* and "*errno_return" is set to the error.
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*/
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void
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read_filter_list(filter_list_type_t list, char **pref_path_return,
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int *errno_return)
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{
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char *ff_path, *ff_dir = PF_DIR, *ff_name;
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FILE *ff;
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GList **flp;
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GList *fl_ent;
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filter_def *filt;
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char f_buf[FILTER_LINE_SIZE];
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char *name_begin, *name_end, *filt_begin;
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int len, line = 0;
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*pref_path_return = NULL; /* assume no error */
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switch (list) {
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case CFILTER_LIST:
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ff_name = CFILTER_FILE_NAME;
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flp = &capture_filters;
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break;
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case DFILTER_LIST:
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ff_name = DFILTER_FILE_NAME;
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flp = &display_filters;
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break;
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default:
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g_assert_not_reached();
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return;
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}
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/* To do: generalize this */
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ff_path = (gchar *) g_malloc(strlen(get_home_dir()) + strlen(ff_dir) +
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strlen(ff_name) + 4);
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sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, ff_name);
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if ((ff = fopen(ff_path, "r")) == NULL) {
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/*
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* Did that fail because we the file didn't exist?
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*/
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if (errno != ENOENT) {
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/*
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* No. Just give up.
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*/
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*pref_path_return = ff_path;
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*errno_return = errno;
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return;
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}
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/*
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* Yes. See if there's a "filters" file; if so, read it.
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* This means that a user will start out with their capture and
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* display filter lists being identical; each list may contain
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* filters that don't belong in that list. The user can edit
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* the filter lists, and delete the ones that don't belong in
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* a particular list.
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*/
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sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, FILTER_FILE_NAME);
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if ((ff = fopen(ff_path, "r")) == NULL) {
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/*
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* Well, that didn't work, either. Just give up.
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* Return an error if the file existed but we couldn't open it.
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*/
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if (errno != ENOENT) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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}
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return;
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}
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}
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/* If we already have a list of filters, discard it. */
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if (*flp != NULL) {
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fl_ent = g_list_first(*flp);
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while (fl_ent != NULL) {
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filt = (filter_def *) fl_ent->data;
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g_free(filt->name);
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g_free(filt->strval);
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g_free(filt);
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fl_ent = fl_ent->next;
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}
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g_list_free(*flp);
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*flp = NULL;
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}
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while (fgets(f_buf, FILTER_LINE_SIZE, ff)) {
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line++;
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len = strlen(f_buf);
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if (f_buf[len - 1] == '\n') {
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len--;
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f_buf[len] = '\0';
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}
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name_begin = strchr(f_buf, '"');
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/* Empty line */
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if (name_begin == NULL)
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continue;
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name_end = strchr(name_begin + 1, '"');
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/* No terminating quote */
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if (name_end == NULL) {
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g_warning("Malformed filter in '%s' line %d.", ff_path, line);
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continue;
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}
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name_begin++;
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name_end[0] = '\0';
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filt_begin = name_end + 1;
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while(isspace((guchar)filt_begin[0])) filt_begin++;
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/* No filter string */
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if (filt_begin[0] == '\0') {
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g_warning("Malformed filter in '%s' line %d.", ff_path, line);
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continue;
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}
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filt = (filter_def *) g_malloc(sizeof(filter_def));
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filt->name = g_strdup(name_begin);
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filt->strval = g_strdup(filt_begin);
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*flp = g_list_append(*flp, filt);
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}
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if (ferror(ff)) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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} else
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g_free(ff_path);
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fclose(ff);
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}
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/*
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* Get a pointer to a list of filters.
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*/
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static GList **
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get_filter_list(filter_list_type_t list)
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{
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GList **flp;
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switch (list) {
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case CFILTER_LIST:
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flp = &capture_filters;
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break;
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case DFILTER_LIST:
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flp = &display_filters;
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break;
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default:
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g_assert_not_reached();
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flp = NULL;
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}
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return flp;
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}
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/*
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* Get a pointer to the first entry in a filter list.
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*/
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GList *
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get_filter_list_first(filter_list_type_t list)
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{
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GList **flp;
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flp = get_filter_list(list);
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return g_list_first(*flp);
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}
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/*
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* Add a new filter to the end of a list.
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* Returns a pointer to the newly-added entry.
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*/
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GList *
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add_to_filter_list(filter_list_type_t list, char *name, char *expression)
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{
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GList **flp;
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filter_def *filt;
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flp = get_filter_list(list);
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filt = (filter_def *) g_malloc(sizeof(filter_def));
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filt->name = g_strdup(name);
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filt->strval = g_strdup(expression);
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*flp = g_list_append(*flp, filt);
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return g_list_last(*flp);
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}
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/*
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* Remove a filter from a list.
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*/
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void
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remove_from_filter_list(filter_list_type_t list, GList *fl_entry)
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{
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GList **flp;
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filter_def *filt;
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flp = get_filter_list(list);
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filt = (filter_def *) fl_entry->data;
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g_free(filt->name);
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g_free(filt->strval);
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g_free(filt);
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*flp = g_list_remove_link(*flp, fl_entry);
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}
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/*
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* Write out a list of filters.
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*
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* On success, "*pref_path_return" is set to NULL.
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* On error, "*pref_path_return" is set to point to the pathname of
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* the file we tried to read - it should be freed by our caller -
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* and "*errno_return" is set to the error.
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*/
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void
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save_filter_list(filter_list_type_t list, char **pref_path_return,
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int *errno_return)
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{
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gchar *ff_path, *ff_path_new, *ff_dir = PF_DIR, *ff_name;
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int path_length;
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GList *fl;
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GList *flp;
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filter_def *filt;
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FILE *ff;
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struct stat s_buf;
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*pref_path_return = NULL; /* assume no error */
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switch (list) {
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case CFILTER_LIST:
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ff_name = CFILTER_FILE_NAME;
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fl = capture_filters;
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break;
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case DFILTER_LIST:
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ff_name = DFILTER_FILE_NAME;
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fl = display_filters;
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break;
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default:
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g_assert_not_reached();
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return;
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}
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path_length = strlen(get_home_dir()) + strlen(ff_dir) + strlen(ff_name)
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+ 4 + 4;
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ff_path = (gchar *) g_malloc(path_length);
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sprintf(ff_path, "%s/%s", get_home_dir(), ff_dir);
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if (stat(ff_path, &s_buf) != 0)
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#ifdef WIN32
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mkdir(ff_path);
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#else
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mkdir(ff_path, 0755);
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#endif
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sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, ff_name);
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/* Write to "XXX.new", and rename if that succeeds.
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That means we don't trash the file if we fail to write it out
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completely. */
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ff_path_new = (gchar *) g_malloc(path_length);
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sprintf(ff_path_new, "%s/%s/%s.new", get_home_dir(), ff_dir, ff_name);
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if ((ff = fopen(ff_path_new, "w")) == NULL) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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g_free(ff_path_new);
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return;
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}
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flp = g_list_first(fl);
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while (flp) {
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filt = (filter_def *) flp->data;
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fprintf(ff, "\"%s\" %s\n", filt->name, filt->strval);
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if (ferror(ff)) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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fclose(ff);
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unlink(ff_path_new);
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g_free(ff_path_new);
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return;
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}
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flp = flp->next;
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}
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if (fclose(ff) == EOF) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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unlink(ff_path_new);
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g_free(ff_path_new);
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return;
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}
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/* XXX - does "rename()" exist on Win32? If so, does it remove the
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target first? If so, does that mean it's not atomic? */
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if (rename(ff_path_new, ff_path) < 0) {
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*pref_path_return = ff_path;
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*errno_return = errno;
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unlink(ff_path_new);
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g_free(ff_path);
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g_free(ff_path_new);
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return;
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}
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g_free(ff_path_new);
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g_free(ff_path);
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}
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