forked from Mirrors/freeswitch
ftmod_libpri: Add MSN/DDI filter for incoming calls.
This feature allows ftmod_libpri to ignore calls with non-matching destination number.
You may want to use this on BRI PTMP lines (Point-to-MultiPoint),
to avoid conflicts between your FreeSWITCH server and other devices connected to the line.
The filter is disabled by default (all calls will be accepted),
setting one (or more) "local-number" parameters on the span configuration enables it.
Example configuration snippet:
<libpri_spans>
<span name="example01">
<!-- ... other span settings omitted ... -->
<param name="local-number" value="123456"/>
<param name="local-number" value="654321"/>
</span>
</libpri_spans>
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>
This commit is contained in:
Stefan Knoblich
parent
1ae88d51d0
commit
c92a55d3f1
@ -38,6 +38,11 @@
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#define MIN(x,y) (((x) < (y)) ? (x) : (y))
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#endif
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static ftdm_status_t ftdm_libpri_start(ftdm_span_t *span);
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static ftdm_io_interface_t ftdm_libpri_interface;
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static void _ftdm_channel_set_state_force(ftdm_channel_t *chan, const ftdm_channel_state_t state)
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{
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assert(chan);
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@ -258,8 +263,145 @@ out:
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return 0;
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}
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static ftdm_status_t ftdm_libpri_start(ftdm_span_t *span);
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static ftdm_io_interface_t ftdm_libpri_interface;
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/***************************************************************
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* MSN filter
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***************************************************************/
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static int msn_filter_init(ftdm_libpri_data_t *isdn_data)
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{
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if (!isdn_data)
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return FTDM_FAIL;
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isdn_data->msn_hash = create_hashtable(16, ftdm_hash_hashfromstring, ftdm_hash_equalkeys);
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if (!isdn_data->msn_hash)
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return FTDM_FAIL;
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if (ftdm_mutex_create(&isdn_data->msn_mutex)) {
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hashtable_destroy(isdn_data->msn_hash);
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return FTDM_FAIL;
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}
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return FTDM_SUCCESS;
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}
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static int msn_filter_destroy(ftdm_libpri_data_t *isdn_data)
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{
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if (!isdn_data)
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return FTDM_FAIL;
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if (isdn_data->msn_hash)
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hashtable_destroy(isdn_data->msn_hash);
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if (isdn_data->msn_mutex)
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ftdm_mutex_destroy(&isdn_data->msn_mutex);
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return FTDM_SUCCESS;
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}
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static int msn_filter_verify(const char *str)
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{
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if (ftdm_strlen_zero(str) || strlen(str) >= FTDM_DIGITS_LIMIT)
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return FTDM_FALSE;
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if (ftdm_is_number(str) != FTDM_SUCCESS)
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return FTDM_FALSE;
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return FTDM_TRUE;
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}
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static int msn_filter_add(ftdm_libpri_data_t *isdn_data, const char *msn)
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{
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static const int value = 0xdeadbeef;
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char *key = NULL;
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int ret = FTDM_SUCCESS;
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if (!isdn_data || !msn_filter_verify(msn))
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return FTDM_FAIL;
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ftdm_mutex_lock(isdn_data->msn_mutex);
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/* check for duplicates (ignore if already in set) */
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if (hashtable_search(isdn_data->msn_hash, (void *)msn)) {
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ret = FTDM_SUCCESS;
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goto out;
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}
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/* Copy MSN (transient string), hashtable will free it in hashtable_destroy() */
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key = ftdm_strdup(msn);
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if (!key) {
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ret = FTDM_FAIL;
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goto out;
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}
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/* add MSN to list/hash */
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if (!hashtable_insert(isdn_data->msn_hash, (void *)key, (void *)&value, HASHTABLE_FLAG_FREE_KEY)) {
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ftdm_safe_free(key);
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ret = FTDM_FAIL;
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}
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out:
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ftdm_mutex_unlock(isdn_data->msn_mutex);
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return ret;
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}
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/**
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*
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*/
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static int msn_filter_match(ftdm_libpri_data_t *isdn_data, const char *msn)
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{
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int ret = FTDM_FALSE;
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if (!isdn_data)
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return FTDM_FAIL;
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/* No number? return match found */
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if (ftdm_strlen_zero(msn))
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return FTDM_TRUE;
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ftdm_mutex_lock(isdn_data->msn_mutex);
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/* No MSN configured? */
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if (hashtable_count(isdn_data->msn_hash) <= 0) {
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ret = FTDM_TRUE;
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goto out;
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}
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/* Search for a matching MSN */
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if (hashtable_search(isdn_data->msn_hash, (void *)msn))
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ret = FTDM_TRUE;
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out:
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ftdm_mutex_unlock(isdn_data->msn_mutex);
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return ret;
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}
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static int msn_filter_foreach(ftdm_libpri_data_t *isdn_data, int (* func)(const char *, void *), void *data)
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{
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ftdm_hash_iterator_t *iter = NULL;
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int ret = FTDM_SUCCESS;
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if (!isdn_data || !func)
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return FTDM_FAIL;
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/* iterate over MSNs */
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ftdm_mutex_lock(isdn_data->msn_mutex);
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for (iter = hashtable_first(isdn_data->msn_hash); iter; iter = hashtable_next(iter)) {
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const char *msn = NULL;
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hashtable_this(iter, (const void **)&msn, NULL, NULL);
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if (ftdm_strlen_zero(msn))
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break;
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if ((ret = func(msn, data)) != FTDM_SUCCESS)
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break;
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}
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ftdm_mutex_unlock(isdn_data->msn_mutex);
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return ret;
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}
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/***************************************************************
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* Module API (CLI) interface
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***************************************************************/
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static const char *ftdm_libpri_usage =
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"Usage:\n"
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@ -268,6 +410,7 @@ static const char *ftdm_libpri_usage =
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"libpri restart <span> <channel/all>\n"
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"libpri maintenance <span> <channel/all> <in/maint/out>\n"
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"libpri debug <span> [all|none|flag,...flagN]\n"
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"libpri msn <span>\n"
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"\n"
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"Possible debug flags:\n"
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"\tq921_raw - Q.921 Raw messages\n"
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@ -287,6 +430,29 @@ static const char *ftdm_libpri_usage =
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"\tnone - Disable debugging\n"
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"\tall - Enable all debug options\n";
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/**
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* Custom data handle for list iterator functions
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*/
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struct msn_list_cb_private {
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ftdm_stream_handle_t *stream;
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unsigned int count;
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};
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static int msn_list_cb(const char *msn, void *priv)
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{
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struct msn_list_cb_private *data = priv;
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ftdm_stream_handle_t *stream = data->stream;
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if (!stream || ftdm_strlen_zero(msn))
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return FTDM_FAIL;
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stream->write_function(stream, "\t%s\n", msn);
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data->count++;
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return FTDM_SUCCESS;
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}
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/**
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* \brief API function to kill or debug a libpri span
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* \param stream API stream handler
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@ -331,6 +497,40 @@ static FIO_API_FUNCTION(ftdm_libpri_api)
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goto done;
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}
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}
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if (!strcasecmp(argv[0], "msn")) {
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ftdm_span_t *span = NULL;
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struct msn_list_cb_private data;
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data.stream = stream;
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data.count = 0;
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if (ftdm_span_find_by_name(argv[1], &span) != FTDM_SUCCESS) {
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stream->write_function(stream, "%s: -ERR span '%s' not found.\n",
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__FILE__, argv[1]);
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goto done;
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}
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if (span->start != ftdm_libpri_start) {
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stream->write_function(stream, "%s: -ERR '%s' is not a libpri span.\n",
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__FILE__, ftdm_span_get_name(span));
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goto done;
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}
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/* header */
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stream->write_function(stream, "------------------------------------------------------------------------------\n");
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if (msn_filter_foreach(span->signal_data, msn_list_cb, &data)) {
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stream->write_function(stream, "-ERR: Failed to list MSN(s)\n");
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goto done;
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}
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if (data.count == 0) {
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stream->write_function(stream, "\t\t\t -- no entries --\n");
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}
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/* footer */
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stream->write_function(stream, "---------------------------------------------------------------[ %02d MSN(s) ]--\n",
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data.count);
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stream->write_function(stream, "+OK");
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goto done;
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}
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} else if (argc >= 2) {
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if (!strcasecmp(argv[0], "debug")) {
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ftdm_span_t *span = NULL;
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@ -1309,12 +1509,30 @@ static int on_ring(lpwrap_pri_t *spri, lpwrap_pri_event_t event_type, pri_event
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{
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ftdm_span_t *span = spri->span;
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ftdm_libpri_data_t *isdn_data = span->signal_data;
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ftdm_channel_t *chan = ftdm_span_get_channel(span, pevent->ring.channel);
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ftdm_channel_t *chan = NULL;
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ftdm_caller_data_t *caller_data = NULL;
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int ret = 0;
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if (pevent->ring.channel == -1) {
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ftdm_log(FTDM_LOG_ERROR, "-- New call without channel on span '%s' [NOTE: Initial SETUP w/o channel selection is not supported by FreeTDM]\n",
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ftdm_span_get_name(span));
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pri_destroycall(spri->pri, pevent->ring.call);
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return ret;
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}
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chan = ftdm_span_get_channel(span, pevent->ring.channel);
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if (!chan) {
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ftdm_log(FTDM_LOG_ERROR, "-- Unable to get channel %d:%d\n", ftdm_span_get_id(span), pevent->ring.channel);
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ftdm_log(FTDM_LOG_ERROR, "-- Unable to get channel %d:%d\n",
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ftdm_span_get_id(span), pevent->ring.channel);
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pri_hangup(spri->pri, pevent->ring.call, PRI_CAUSE_DESTINATION_OUT_OF_ORDER);
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return ret;
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}
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/* check MSN filter */
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if (!msn_filter_match(isdn_data, pevent->ring.callednum)) {
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ftdm_log(FTDM_LOG_INFO, "-- MSN filter not matching incoming DNIS '%s', ignoring call\n",
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pevent->ring.callednum);
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pri_destroycall(spri->pri, pevent->ring.call);
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return ret;
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}
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@ -2216,7 +2434,7 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_libpri_configure_span)
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#ifndef HAVE_LIBPRI_BRI
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ftdm_log(FTDM_LOG_ERROR, "Unsupported trunk type: '%s', libpri too old\n", ftdm_span_get_trunk_type_str(span));
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snprintf(span->last_error, sizeof(span->last_error), "Unsupported trunk type [%s], libpri too old", ftdm_span_get_trunk_type_str(span));
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return FTDM_FAIL;
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goto error;
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#endif
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case FTDM_TRUNK_E1:
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ftdm_log(FTDM_LOG_NOTICE, "Setting default Layer 1 to ALAW since this is an E1/BRI/BRI PTMP trunk\n");
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@ -2232,7 +2450,16 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_libpri_configure_span)
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default:
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ftdm_log(FTDM_LOG_ERROR, "Invalid trunk type: '%s'\n", ftdm_span_get_trunk_type_str(span));
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snprintf(span->last_error, sizeof(span->last_error), "Invalid trunk type [%s]", ftdm_span_get_trunk_type_str(span));
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return FTDM_FAIL;
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goto error;
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}
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/*
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* Init MSN filter
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*/
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if (msn_filter_init(isdn_data) != FTDM_SUCCESS) {
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ftdm_log(FTDM_LOG_ERROR, "Failed to init MSN filter\n");
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snprintf(span->last_error, sizeof(span->last_error), "Failed to init MSN filter");
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goto error;
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}
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for (i = 0; ftdm_parameters[i].var; i++) {
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@ -2247,7 +2474,7 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_libpri_configure_span)
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if (ftdm_strlen_zero(val)) {
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ftdm_log(FTDM_LOG_ERROR, "Parameter '%s' has no value\n", var);
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snprintf(span->last_error, sizeof(span->last_error), "Parameter [%s] has no value", var);
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return FTDM_FAIL;
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goto error;
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}
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if (!strcasecmp(var, "node") || !strcasecmp(var, "mode")) {
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@ -2285,10 +2512,17 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_libpri_configure_span)
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isdn_data->service_message_support = 1;
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}
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}
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else if (!strcasecmp(var, "local-number") || !strcasecmp(var, "msn")) {
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if (msn_filter_add(isdn_data, val) != FTDM_SUCCESS) {
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ftdm_log(FTDM_LOG_ERROR, "Invalid MSN/DDI(s) '%s' specified\n", val);
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snprintf(span->last_error, sizeof(span->last_error), "Invalid MSN/DDI(s) '%s' specified!", val);
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goto error;
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}
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}
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else {
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ftdm_log(FTDM_LOG_ERROR, "Unknown parameter '%s', aborting configuration\n", var);
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snprintf(span->last_error, sizeof(span->last_error), "Unknown parameter [%s]", var);
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return FTDM_FAIL;
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goto error;
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}
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}
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@ -2315,6 +2549,10 @@ static FIO_CONFIGURE_SPAN_SIGNALING_FUNCTION(ftdm_libpri_configure_span)
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}
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return FTDM_SUCCESS;
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error:
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msn_filter_destroy(isdn_data);
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ftdm_safe_free(isdn_data);
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return FTDM_FAIL;
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}
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/**
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@ -76,6 +76,10 @@ struct ftdm_libpri_data {
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unsigned int service_message_support;
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lpwrap_pri_t spri;
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/* MSN filter */
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ftdm_hash_t *msn_hash;
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ftdm_mutex_t *msn_mutex;
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};
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typedef struct ftdm_libpri_data ftdm_libpri_data_t;
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