/* filters.c
* Code for reading and writing the filters file.
*
- * $Id: filters.c,v 1.1 2001/01/28 04:43:24 guy Exp $
+ * $Id$
*
* Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@zing.org>
+ * By Gerald Combs <gerald@ethereal.com>
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include <stdio.h>
#include <string.h>
#include <ctype.h>
-
-#ifdef HAVE_SYS_STAT_H
-#include <sys/stat.h>
-#endif
+#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#include <glib.h>
-#include <epan.h>
+#include <epan/filesystem.h>
#include "filters.h"
-#include "util.h"
-#define FILTER_LINE_SIZE 2048
+/*
+ * Old filter file name.
+ */
+#define FILTER_FILE_NAME "filters"
+
+/*
+ * Capture filter file name.
+ */
+#define CFILTER_FILE_NAME "cfilters"
+
+/*
+ * Display filter file name.
+ */
+#define DFILTER_FILE_NAME "dfilters"
+
+/*
+ * List of capture filters.
+ */
+static GList *capture_filters = NULL;
/*
- * List of filters.
+ * List of display filters.
*/
-GList *fl = NULL;
+static GList *display_filters = NULL;
+
+/*
+ * Read in a list of filters.
+ *
+ * On success, "*pref_path_return" is set to NULL.
+ * On error, "*pref_path_return" is set to point to the pathname of
+ * the file we tried to read - it should be freed by our caller -
+ * and "*errno_return" is set to the error.
+ */
+
+#define INIT_BUF_SIZE 128
void
-get_filter_list(void)
+read_filter_list(filter_list_type_t list, char **pref_path_return,
+ int *errno_return)
{
- filter_def *filt;
+ char *ff_path, *ff_name;
FILE *ff;
- gchar *ff_path, *ff_name = PF_DIR "/filters", f_buf[FILTER_LINE_SIZE];
- gchar *name_begin, *name_end, *filt_begin;
- int len, line = 0;
+ GList **flp;
+ GList *fl_ent;
+ filter_def *filt;
+ int c;
+ char *filt_name, *filt_expr;
+ int filt_name_len, filt_expr_len;
+ int filt_name_index, filt_expr_index;
+ int line = 1;
- if (fl) return;
-
- /* To do: generalize this */
- ff_path = (gchar *) g_malloc(strlen(get_home_dir()) + strlen(ff_name) + 4);
- sprintf(ff_path, "%s/%s", get_home_dir(), ff_name);
+ *pref_path_return = NULL; /* assume no error */
+
+ switch (list) {
+ case CFILTER_LIST:
+ ff_name = CFILTER_FILE_NAME;
+ flp = &capture_filters;
+ break;
+
+ case DFILTER_LIST:
+ ff_name = DFILTER_FILE_NAME;
+ flp = &display_filters;
+ break;
+
+ default:
+ g_assert_not_reached();
+ return;
+ }
+
+ /* To do: generalize this */
+ ff_path = get_persconffile_path(ff_name, FALSE);
if ((ff = fopen(ff_path, "r")) == NULL) {
+ /*
+ * Did that fail because we the file didn't exist?
+ */
+ if (errno != ENOENT) {
+ /*
+ * No. Just give up.
+ */
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ return;
+ }
+
+ /*
+ * Yes. See if there's a "filters" file; if so, read it.
+ * This means that a user will start out with their capture and
+ * display filter lists being identical; each list may contain
+ * filters that don't belong in that list. The user can edit
+ * the filter lists, and delete the ones that don't belong in
+ * a particular list.
+ */
g_free(ff_path);
- return;
+ ff_path = get_persconffile_path(FILTER_FILE_NAME, FALSE);
+ if ((ff = fopen(ff_path, "r")) == NULL) {
+ /*
+ * Well, that didn't work, either. Just give up.
+ * Return an error if the file existed but we couldn't open it.
+ */
+ if (errno != ENOENT) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ }
+ return;
+ }
+ }
+
+ /* If we already have a list of filters, discard it. */
+ if (*flp != NULL) {
+ fl_ent = g_list_first(*flp);
+ while (fl_ent != NULL) {
+ filt = (filter_def *) fl_ent->data;
+ g_free(filt->name);
+ g_free(filt->strval);
+ g_free(filt);
+ fl_ent = fl_ent->next;
+ }
+ g_list_free(*flp);
+ *flp = NULL;
}
- while (fgets(f_buf, FILTER_LINE_SIZE, ff)) {
- line++;
- len = strlen(f_buf);
- if (f_buf[len - 1] == '\n') {
- len--;
- f_buf[len] = '\0';
+ /* Allocate the filter name buffer. */
+ filt_name_len = INIT_BUF_SIZE;
+ filt_name = g_malloc(filt_name_len + 1);
+ filt_expr_len = INIT_BUF_SIZE;
+ filt_expr = g_malloc(filt_expr_len + 1);
+
+ for (line = 1; ; line++) {
+ /* Lines in a filter file are of the form
+
+ "name" expression
+
+ where "name" is a name, in quotes - backslashes in the name
+ escape the next character, so quotes and backslashes can appear
+ in the name - and "expression" is a filter expression, not in
+ quotes, running to the end of the line. */
+
+ /* Skip over leading white space, if any. */
+ while ((c = getc(ff)) != EOF && isspace(c)) {
+ if (c == '\n') {
+ /* Blank line. */
+ continue;
+ }
}
- name_begin = strchr(f_buf, '"');
- /* Empty line */
- if (name_begin == NULL)
+
+ if (c == EOF)
+ break; /* Nothing more to read */
+
+ /* "c" is the first non-white-space character.
+ If it's not a quote, it's an error. */
+ if (c != '"') {
+ g_warning("'%s' line %d doesn't have a quoted filter name.", ff_path,
+ line);
+ while (c != '\n')
+ c = getc(ff); /* skip to the end of the line */
continue;
- name_end = strchr(name_begin + 1, '"');
- /* No terminating quote */
- if (name_end == NULL) {
- g_warning("Malformed filter in '%s' line %d.", ff_path, line);
+ }
+
+ /* Get the name of the filter. */
+ filt_name_index = 0;
+ for (;;) {
+ c = getc(ff);
+ if (c == EOF || c == '\n')
+ break; /* End of line - or end of file */
+ if (c == '"') {
+ /* Closing quote. */
+ if (filt_name_index >= filt_name_len) {
+ /* Filter name buffer isn't long enough; double its length. */
+ filt_name_len *= 2;
+ filt_name = g_realloc(filt_name, filt_name_len + 1);
+ }
+ filt_name[filt_name_index] = '\0';
+ break;
+ }
+ if (c == '\\') {
+ /* Next character is escaped */
+ c = getc(ff);
+ if (c == EOF || c == '\n')
+ break; /* End of line - or end of file */
+ }
+ /* Add this character to the filter name string. */
+ if (filt_name_index >= filt_name_len) {
+ /* Filter name buffer isn't long enough; double its length. */
+ filt_name_len *= 2;
+ filt_name = g_realloc(filt_name, filt_name_len + 1);
+ }
+ filt_name[filt_name_index] = c;
+ filt_name_index++;
+ }
+
+ if (c == EOF) {
+ if (!ferror(ff)) {
+ /* EOF, not error; no newline seen before EOF */
+ g_warning("'%s' line %d doesn't have a newline.", ff_path,
+ line);
+ }
+ break; /* nothing more to read */
+ }
+
+ if (c != '"') {
+ /* No newline seen before end-of-line */
+ g_warning("'%s' line %d doesn't have a closing quote.", ff_path,
+ line);
continue;
}
- name_begin++;
- name_end[0] = '\0';
- filt_begin = name_end + 1;
- while(isspace((guchar)filt_begin[0])) filt_begin++;
- /* No filter string */
- if (filt_begin[0] == '\0') {
- g_warning("Malformed filter in '%s' line %d.", ff_path, line);
+
+ /* Skip over separating white space, if any. */
+ while ((c = getc(ff)) != EOF && isspace(c)) {
+ if (c == '\n')
+ break;
+ }
+
+ if (c == EOF) {
+ if (!ferror(ff)) {
+ /* EOF, not error; no newline seen before EOF */
+ g_warning("'%s' line %d doesn't have a newline.", ff_path,
+ line);
+ }
+ break; /* nothing more to read */
+ }
+
+ if (c == '\n') {
+ /* No filter expression */
+ g_warning("'%s' line %d doesn't have a filter expression.", ff_path,
+ line);
continue;
}
+
+ /* "c" is the first non-white-space character; it's the first
+ character of the filter expression. */
+ filt_expr_index = 0;
+ for (;;) {
+ /* Add this character to the filter expression string. */
+ if (filt_expr_index >= filt_expr_len) {
+ /* Filter expressioin buffer isn't long enough; double its length. */
+ filt_expr_len *= 2;
+ filt_expr = g_realloc(filt_expr, filt_expr_len + 1);
+ }
+ filt_expr[filt_expr_index] = c;
+ filt_expr_index++;
+
+ /* Get the next character. */
+ c = getc(ff);
+ if (c == EOF || c == '\n')
+ break;
+ }
+
+ if (c == EOF) {
+ if (!ferror(ff)) {
+ /* EOF, not error; no newline seen before EOF */
+ g_warning("'%s' line %d doesn't have a newline.", ff_path,
+ line);
+ }
+ break; /* nothing more to read */
+ }
+
+ /* We saw the ending newline; terminate the filter expression string */
+ if (filt_expr_index >= filt_expr_len) {
+ /* Filter expressioin buffer isn't long enough; double its length. */
+ filt_expr_len *= 2;
+ filt_expr = g_realloc(filt_expr, filt_expr_len + 1);
+ }
+ filt_expr[filt_expr_index] = '\0';
+
+ /* Add the new filter to the list of filters */
filt = (filter_def *) g_malloc(sizeof(filter_def));
- filt->name = g_strdup(name_begin);
- filt->strval = g_strdup(filt_begin);
- fl = g_list_append(fl, filt);
+ filt->name = g_strdup(filt_name);
+ filt->strval = g_strdup(filt_expr);
+ *flp = g_list_append(*flp, filt);
}
+ if (ferror(ff)) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ } else
+ g_free(ff_path);
fclose(ff);
- g_free(ff_path);
+ g_free(filt_name);
+ g_free(filt_expr);
+}
+
+/*
+ * Get a pointer to a list of filters.
+ */
+static GList **
+get_filter_list(filter_list_type_t list)
+{
+ GList **flp;
+
+ switch (list) {
+
+ case CFILTER_LIST:
+ flp = &capture_filters;
+ break;
+
+ case DFILTER_LIST:
+ flp = &display_filters;
+ break;
+
+ default:
+ g_assert_not_reached();
+ flp = NULL;
+ }
+ return flp;
}
+/*
+ * Get a pointer to the first entry in a filter list.
+ */
+GList *
+get_filter_list_first(filter_list_type_t list)
+{
+ GList **flp;
+
+ flp = get_filter_list(list);
+ return g_list_first(*flp);
+}
+
+/*
+ * Add a new filter to the end of a list.
+ * Returns a pointer to the newly-added entry.
+ */
+GList *
+add_to_filter_list(filter_list_type_t list, const char *name,
+ const char *expression)
+{
+ GList **flp;
+ filter_def *filt;
+
+ flp = get_filter_list(list);
+ filt = (filter_def *) g_malloc(sizeof(filter_def));
+ filt->name = g_strdup(name);
+ filt->strval = g_strdup(expression);
+ *flp = g_list_append(*flp, filt);
+ return g_list_last(*flp);
+}
+
+/*
+ * Remove a filter from a list.
+ */
void
-save_filter_list(void)
+remove_from_filter_list(filter_list_type_t list, GList *fl_entry)
{
- GList *flp;
- filter_def *filt;
- gchar *ff_path, *ff_dir = PF_DIR, *ff_name = "filters";
- FILE *ff;
- struct stat s_buf;
-
- ff_path = (gchar *) g_malloc(strlen(get_home_dir()) + strlen(ff_dir) +
- strlen(ff_name) + 4);
- sprintf(ff_path, "%s/%s", get_home_dir(), ff_dir);
-
- if (stat(ff_path, &s_buf) != 0)
-#ifdef WIN32
- mkdir(ff_path);
-#else
- mkdir(ff_path, 0755);
-#endif
-
- sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, ff_name);
+ GList **flp;
+ filter_def *filt;
+
+ flp = get_filter_list(list);
+ filt = (filter_def *) fl_entry->data;
+ g_free(filt->name);
+ g_free(filt->strval);
+ g_free(filt);
+ *flp = g_list_remove_link(*flp, fl_entry);
+}
- if ((ff = fopen(ff_path, "w")) != NULL) {
- flp = g_list_first(fl);
- while (flp) {
- filt = (filter_def *) flp->data;
- fprintf(ff, "\"%s\" %s\n", filt->name, filt->strval);
- flp = flp->next;
+/*
+ * Write out a list of filters.
+ *
+ * On success, "*pref_path_return" is set to NULL.
+ * On error, "*pref_path_return" is set to point to the pathname of
+ * the file we tried to read - it should be freed by our caller -
+ * and "*errno_return" is set to the error.
+ */
+void
+save_filter_list(filter_list_type_t list, char **pref_path_return,
+ int *errno_return)
+{
+ gchar *ff_path, *ff_path_new, *ff_name;
+ GList *fl;
+ GList *flp;
+ filter_def *filt;
+ FILE *ff;
+ guchar *p, c;
+
+ *pref_path_return = NULL; /* assume no error */
+
+ switch (list) {
+
+ case CFILTER_LIST:
+ ff_name = CFILTER_FILE_NAME;
+ fl = capture_filters;
+ break;
+
+ case DFILTER_LIST:
+ ff_name = DFILTER_FILE_NAME;
+ fl = display_filters;
+ break;
+
+ default:
+ g_assert_not_reached();
+ return;
+ }
+
+ ff_path = get_persconffile_path(ff_name, TRUE);
+
+ /* Write to "XXX.new", and rename if that succeeds.
+ That means we don't trash the file if we fail to write it out
+ completely. */
+ ff_path_new = (gchar *) g_malloc(strlen(ff_path) + 5);
+ sprintf(ff_path_new, "%s.new", ff_path);
+
+ if ((ff = fopen(ff_path_new, "w")) == NULL) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ g_free(ff_path_new);
+ return;
+ }
+ flp = g_list_first(fl);
+ while (flp) {
+ filt = (filter_def *) flp->data;
+
+ /* Write out the filter name as a quoted string; escape any quotes
+ or backslashes. */
+ putc('"', ff);
+ for (p = (guchar *)filt->name; (c = *p) != '\0'; p++) {
+ if (c == '"' || c == '\\')
+ putc('\\', ff);
+ putc(c, ff);
}
- fclose(ff);
+ putc('"', ff);
+
+ /* Separate the filter name and value with a space. */
+ putc(' ', ff);
+
+ /* Write out the filter expression and a newline. */
+ fprintf(ff, "%s\n", filt->strval);
+ if (ferror(ff)) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ fclose(ff);
+ unlink(ff_path_new);
+ g_free(ff_path_new);
+ return;
+ }
+ flp = flp->next;
+ }
+ if (fclose(ff) == EOF) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ unlink(ff_path_new);
+ g_free(ff_path_new);
+ return;
}
+#ifdef _WIN32
+ /* ANSI C doesn't say whether "rename()" removes the target if it
+ exists; the Win32 call to rename files doesn't do so, which I
+ infer is the reason why the MSVC++ "rename()" doesn't do so.
+ We must therefore remove the target file first, on Windows. */
+ if (remove(ff_path) < 0 && errno != ENOENT) {
+ /* It failed for some reason other than "it's not there"; if
+ it's not there, we don't need to remove it, so we just
+ drive on. */
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ unlink(ff_path_new);
+ g_free(ff_path_new);
+ return;
+ }
+#endif
+
+ if (rename(ff_path_new, ff_path) < 0) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ unlink(ff_path_new);
+ g_free(ff_path_new);
+ return;
+ }
+ g_free(ff_path_new);
g_free(ff_path);
}
git.samba.org / obnox / wireshark / wip.git / blobdiff