dialog PRACK: Add a couple knobs/settings for UAC-side control

    * auto_prack_hangup_on_failure (default: 0) -> enable strict UAC
    * auto_prack_fr_timeout (default: 2 sec) -> related to above

Author: liviuchircu

modules/dialog/dialog.c

@@ -78,6 +78,8 @@ int dlg_del_delay = 0;               /* in seconds, default off */
 str dlg_extra_hdrs = {NULL,0};
 int race_condition_timeout = 5; /* seconds until call termination is triggered,
 					after 200OK -> CANCEL race detection */
+int auto_prack_hangup_on_failure = 0;
+int auto_prack_fr_timeout = 3;
 
 /* statistic variables */
 int dlg_enable_stats = 1;
@@ -305,6 +307,8 @@ static const param_export_t mod_params[]={
 	{ "delete_delay",          INT_PARAM, &dlg_del_delay            },
 	{ "dlg_extra_hdrs",        STR_PARAM, &dlg_extra_hdrs.s         },
 	{ "dlg_match_mode",        INT_PARAM, &seq_match_mode           },
+	{ "auto_prack_hangup_on_failure", INT_PARAM, &auto_prack_hangup_on_failure },
+	{ "auto_prack_fr_timeout", INT_PARAM, &auto_prack_fr_timeout },
 	{ "db_url",                STR_PARAM, &db_url.s                 },
 	{ "db_mode",               INT_PARAM, &dlg_db_mode              },
 	{ "table_name",            STR_PARAM, &dialog_table_name        },

modules/dialog/dlg_req_within.c

@@ -45,7 +45,6 @@
 
 extern str dlg_extra_hdrs;
 
-#define DLG_AUTO_PRACK_FR_TIMEOUT 2
 #define DLG_TM_TID_LEN ((sizeof(int) * 2) + 1 + (sizeof(int) * 2))
 
 struct dlg_auto_prack_ctx {
@@ -66,6 +65,12 @@ static void dlg_auto_prack_reply_failure(struct dlg_auto_prack_ctx *ctx)
 	struct cell *invite_t;
 	int rc;
 
+	if (!auto_prack_hangup_on_failure) {
+		LM_DBG("auto PRACK failure observed for correlated INVITE transaction <%.*s>, but auto_prack_hangup_on_failure is disabled\n",
+			ctx->invite_tid.len, ctx->invite_tid.s);
+		return;
+	}
+
 	rc = d_tmb.t_lookup_ident(&invite_t, ctx->invite_hash_index,
 			ctx->invite_label);
 	if (rc < 0) {
@@ -157,7 +162,7 @@ static void dlg_auto_prack_t_created(struct cell *t, void *param)
 	str prack_tid = STR_NULL;
 	struct dlg_auto_prack_ctx *ctx = param;
 
-	t->fr_timeout = DLG_AUTO_PRACK_FR_TIMEOUT;
+	t->fr_timeout = auto_prack_fr_timeout;
 
 	if (dlg_format_trans_id(t->hash_index, t->label, &prack_tid, prack_tid_buf,
 			sizeof(prack_tid_buf)) < 0) {

modules/dialog/dlg_req_within.h

@@ -43,6 +43,8 @@
 #define DLG_PING_FAIL     2
 
 extern struct tm_binds d_tmb;
+extern int auto_prack_hangup_on_failure;
+extern int auto_prack_fr_timeout;
 
 typedef void (dlg_request_callback)(struct cell *t,int type,
 					struct tmcb_params* ps);