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-rw-r--r--filters.c298
1 files changed, 261 insertions, 37 deletions
diff --git a/filters.c b/filters.c
index 682a37c9c7..2aeacbf1d6 100644
--- a/filters.c
+++ b/filters.c
@@ -1,7 +1,7 @@
/* filters.c
* Code for reading and writing the filters file.
*
- * $Id: filters.c,v 1.2 2001/01/28 04:52:28 guy Exp $
+ * $Id: filters.c,v 1.3 2001/01/28 09:13:07 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@@ -30,6 +30,7 @@
#include <stdio.h>
#include <string.h>
#include <ctype.h>
+#include <errno.h>
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
@@ -46,44 +47,125 @@
#include "filters.h"
#include "util.h"
+/*
+ * 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"
+
#define FILTER_LINE_SIZE 2048
/*
- * List of filters.
+ * List of capture filters.
+ */
+static GList *capture_filters = NULL;
+
+/*
+ * 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.
+ */
void
-get_filter_list(void)
+read_filter_list(filter_list_type_t list, char **pref_path_return,
+ int *errno_return)
{
- GList *flp;
- filter_def *filt;
+ char *ff_path, *ff_dir = PF_DIR, *ff_name;
FILE *ff;
- gchar *ff_path, *ff_name = PF_DIR "/filters", f_buf[FILTER_LINE_SIZE];
- gchar *name_begin, *name_end, *filt_begin;
+ GList **flp;
+ GList *fl_ent;
+ filter_def *filt;
+ char f_buf[FILTER_LINE_SIZE];
+ char *name_begin, *name_end, *filt_begin;
int len, line = 0;
- /* If we already have a list of filters, discard it. */
- if (fl != NULL) {
- flp = g_list_first(fl);
- while (flp) {
- filt = (filter_def *) flp->data;
- g_free(filt->name);
- g_free(filt->strval);
- g_free(filt);
- flp = flp->next;
- }
- g_list_free(fl);
- fl = NULL;
+ *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 = (gchar *) g_malloc(strlen(get_home_dir()) + strlen(ff_name) + 4);
- sprintf(ff_path, "%s/%s", get_home_dir(), ff_name);
+ ff_path = (gchar *) g_malloc(strlen(get_home_dir()) + strlen(ff_dir) +
+ strlen(ff_name) + 4);
+ sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, ff_name);
if ((ff = fopen(ff_path, "r")) == NULL) {
- g_free(ff_path);
- return;
+ /*
+ * 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.
+ */
+ sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, FILTER_FILE_NAME);
+ 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)) {
@@ -115,23 +197,130 @@ get_filter_list(void)
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);
+ *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);
}
+/*
+ * 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, char *name, 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
+remove_from_filter_list(filter_list_type_t list, GList *fl_entry)
+{
+ 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);
+}
+
+/*
+ * 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(void)
+save_filter_list(filter_list_type_t list, char **pref_path_return,
+ int *errno_return)
{
+ gchar *ff_path, *ff_path_new, *ff_dir = PF_DIR, *ff_name;
+ int path_length;
+ GList *fl;
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);
+ *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;
+ }
+
+ path_length = strlen(get_home_dir()) + strlen(ff_dir) + strlen(ff_name)
+ + 4 + 4;
+ ff_path = (gchar *) g_malloc(path_length);
sprintf(ff_path, "%s/%s", get_home_dir(), ff_dir);
if (stat(ff_path, &s_buf) != 0)
@@ -143,15 +332,50 @@ save_filter_list(void)
sprintf(ff_path, "%s/%s/%s", get_home_dir(), ff_dir, ff_name);
- 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 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(path_length);
+ sprintf(ff_path_new, "%s/%s/%s.new", get_home_dir(), ff_dir, ff_name);
+
+ 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;
+ fprintf(ff, "\"%s\" %s\n", filt->name, 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;
}
- fclose(ff);
+ 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;
}
+ /* XXX - does "rename()" exist on Win32? If so, does it remove the
+ target first? If so, does that mean it's not atomic? */
+ if (rename(ff_path_new, ff_path) < 0) {
+ *pref_path_return = ff_path;
+ *errno_return = errno;
+ unlink(ff_path_new);
+ g_free(ff_path);
+ g_free(ff_path_new);
+ return;
+ }
+ g_free(ff_path_new);
g_free(ff_path);
}
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