freetdm: add configuration option for DTMF debug directory

libs/freetdm/conf/freetdm.conf

@@ -20,6 +20,9 @@ cpu_reset_alarm_threshold => 70
 ; cpu_alarm_action => warn,reject
 cpu_alarm_action => warn
 
+; Where to dump DTMF debug files (see per span debugdtmf=yes option)
+debugdtmf_directory=/full/path/to/dtmf/directory
+
 ; spans are defined with [span <span type> <span name>]
 ; the span type can either be zt, wanpipe or pika
 ; the span name can be any unique string

libs/freetdm/src/ftdm_io.c

@@ -244,6 +244,7 @@ static struct {
 	ftdm_caller_data_t *call_ids[MAX_CALLIDS+1];
 	ftdm_mutex_t *call_id_mutex;
 	uint32_t last_call_id;
+	char dtmfdebug_directory[1024];
 } globals;
 
 enum ftdm_enum_cpu_alarm_action_flags
@@ -3469,7 +3470,7 @@ FT_DECLARE(ftdm_status_t) ftdm_channel_queue_dtmf(ftdm_channel_t *ftdmchan, cons
 	if (!ftdmchan->dtmfdbg.file) {
 		struct tm currtime;
 		time_t currsec;
-		char dfile[512];
+		char dfile[1024];
 
 		currsec = time(NULL);
 
@@ -3480,10 +3481,18 @@ FT_DECLARE(ftdm_status_t) ftdm_channel_queue_dtmf(ftdm_channel_t *ftdmchan, cons
 		localtime_r(&currsec, &currtime);
 #endif
 
-		snprintf(dfile, sizeof(dfile), "dtmf-s%dc%d-20%d-%d-%d-%d:%d:%d.%s", 
-				ftdmchan->span_id, ftdmchan->chan_id, 
-				currtime.tm_year-100, currtime.tm_mon+1, currtime.tm_mday,
-				currtime.tm_hour, currtime.tm_min, currtime.tm_sec, ftdmchan->native_codec == FTDM_CODEC_ULAW ? "ulaw" : ftdmchan->native_codec == FTDM_CODEC_ALAW ? "alaw" : "sln");
+		if (ftdm_strlen_zero(globals.dtmfdebug_directory)) {
+			snprintf(dfile, sizeof(dfile), "dtmf-s%dc%d-20%d-%d-%d-%d:%d:%d.%s", 
+					ftdmchan->span_id, ftdmchan->chan_id, 
+					currtime.tm_year-100, currtime.tm_mon+1, currtime.tm_mday,
+					currtime.tm_hour, currtime.tm_min, currtime.tm_sec, ftdmchan->native_codec == FTDM_CODEC_ULAW ? "ulaw" : ftdmchan->native_codec == FTDM_CODEC_ALAW ? "alaw" : "sln");
+		} else {
+			snprintf(dfile, sizeof(dfile), "%s/dtmf-s%dc%d-20%d-%d-%d-%d:%d:%d.%s", 
+					globals.dtmfdebug_directory,
+					ftdmchan->span_id, ftdmchan->chan_id, 
+					currtime.tm_year-100, currtime.tm_mon+1, currtime.tm_mday,
+					currtime.tm_hour, currtime.tm_min, currtime.tm_sec, ftdmchan->native_codec == FTDM_CODEC_ULAW ? "ulaw" : ftdmchan->native_codec == FTDM_CODEC_ALAW ? "alaw" : "sln");
+		}
 		ftdmchan->dtmfdbg.file = fopen(dfile, "wb");	
 		if (!ftdmchan->dtmfdbg.file) {
 			ftdm_log_chan(ftdmchan, FTDM_LOG_ERROR, "failed to open debug dtmf file %s\n", dfile);
@@ -4697,6 +4706,9 @@ static ftdm_status_t load_config(void)
 						globals.cpu_monitor.alarm_action_flags |= FTDM_CPU_ALARM_ACTION_WARN;
 					}
 				}
+			} else if (!strncasecmp(var, "debugdtmf_directory", sizeof("debugdtmf_directory")-1)) {
+				ftdm_set_string(globals.dtmfdebug_directory, val);
+				ftdm_log(FTDM_LOG_DEBUG, "Debug DTMF directory set to '%s'\n", globals.dtmfdebug_directory);
 			} else if (!strncasecmp(var, "cpu_monitoring_interval", sizeof("cpu_monitoring_interval")-1)) {
 				if (atoi(val) > 0) {
 					globals.cpu_monitor.interval = atoi(val);