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/*
* Copyright (c) 2009, Rambler media
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY Rambler media ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Rambler BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/***MODULE:chartable
* rspamd module that make marks based on symbol chains
*
* Allowed options:
* - symbol (string): symbol to insert (default: 'R_BAD_CHARSET')
* - threshold (double): value that would be used as threshold in expression characters_changed / total_characters
* (e.g. if threshold is 0.1 than charset change should occure more often than in 10 symbols), default: 0.1
*/
#include "../config.h"
#include "../main.h"
#include "../message.h"
#include "../modules.h"
#include "../cfg_file.h"
#include "../expressions.h"
#include "../view.h"
#define DEFAULT_SYMBOL "R_CHARSET_MIXED"
#define DEFAULT_THRESHOLD 0.1
struct chartable_ctx {
int (*filter) (struct worker_task * task);
char *symbol;
double threshold;
memory_pool_t *chartable_pool;
};
static struct chartable_ctx *chartable_module_ctx = NULL;
static int chartable_mime_filter (struct worker_task *task);
static void chartable_symbol_callback (struct worker_task *task, void *unused);
int
chartable_module_init (struct config_file *cfg, struct module_ctx **ctx)
{
chartable_module_ctx = g_malloc (sizeof (struct chartable_ctx));
chartable_module_ctx->filter = chartable_mime_filter;
chartable_module_ctx->chartable_pool = memory_pool_new (memory_pool_get_size ());
*ctx = (struct module_ctx *)chartable_module_ctx;
return 0;
}
int
chartable_module_config (struct config_file *cfg)
{
char *value;
int res = TRUE;
if ((value = get_module_opt (cfg, "chartable", "threshold")) != NULL) {
errno = 0;
chartable_module_ctx->threshold = strtod (value, NULL);
if (errno != 0) {
msg_warn ("invalid numeric value '%s': %s", value, strerror (errno));
chartable_module_ctx->threshold = DEFAULT_THRESHOLD;
}
}
else {
chartable_module_ctx->threshold = DEFAULT_THRESHOLD;
}
register_symbol (&cfg->cache, chartable_module_ctx->symbol, 1, chartable_symbol_callback, NULL);
return res;
}
int
chartable_module_reconfig (struct config_file *cfg)
{
memory_pool_delete (chartable_module_ctx->chartable_pool);
chartable_module_ctx->chartable_pool = memory_pool_new (1024);
return chartable_module_config (cfg);
}
static gboolean
check_part (struct mime_text_part *part, gboolean raw_mode)
{
unsigned char *p, *p1;
gunichar c, t;
GUnicodeScript scc, sct;
uint32_t mark = 0, total = 0;
uint32_t remain = part->content->len;
p = part->content->data;
if (part->is_raw || raw_mode) {
while (remain > 1) {
if ((g_ascii_isalpha (*p) && (*(p + 1) & 0x80)) || ((*p & 0x80) && g_ascii_isalpha (*(p + 1)))) {
mark++;
total++;
}
/* Current and next symbols are of one class */
else if (((*p & 0x80) && (*(p + 1) & 0x80)) || (g_ascii_isalpha (*p) && g_ascii_isalpha (*(p + 1)))) {
total++;
}
p++;
remain--;
}
}
else {
while (remain > 0) {
c = g_utf8_get_char_validated (p, remain);
if (c == (gunichar) - 2 || c == (gunichar) - 1) {
/* Invalid characters detected, stop processing */
return FALSE;
}
scc = g_unichar_get_script (c);
p1 = g_utf8_next_char (p);
remain -= p1 - p;
p = p1;
if (remain > 0) {
t = g_utf8_get_char_validated (p, remain);
if (c == (gunichar) - 2 || c == (gunichar) - 1) {
/* Invalid characters detected, stop processing */
return FALSE;
}
sct = g_unichar_get_script (t);
if (g_unichar_isalnum (c) && g_unichar_isalnum (t)) {
/* We have two unicode alphanumeric characters, so we can check its script */
if (sct != scc) {
mark++;
}
total++;
}
p1 = g_utf8_next_char (p);
remain -= p1 - p;
p = p1;
}
}
}
return ((double)mark / (double)total) > chartable_module_ctx->threshold;
}
static void
chartable_symbol_callback (struct worker_task *task, void *unused)
{
GList *cur;
struct mime_text_part *part;
if (check_view (task->cfg->views, chartable_module_ctx->symbol, task)) {
cur = g_list_first (task->text_parts);
while (cur) {
part = cur->data;
if (!part->is_empty && check_part (part, task->cfg->raw_mode)) {
insert_result (task, chartable_module_ctx->symbol, 1, NULL);
}
cur = g_list_next (cur);
}
}
}
static int
chartable_mime_filter (struct worker_task *task)
{
/* XXX: remove it */
return 0;
}
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