From 7a36d0beac6c5e1253076a2b42d778fd389695e6 Mon Sep 17 00:00:00 2001
From: Nanang Izzuddin <nanang@teluu.com>
Date: Tue, 19 Mar 2013 07:39:25 +0000
Subject: Close #1645: Added run-time setting 'pjsip_cfg()->req_has_via_alias'
 and compile-time setting 'PJSIP_REQ_HAS_VIA_ALIAS', the default value is
 PJ_TRUE.

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@4442 74dad513-b988-da41-8d7b-12977e46ad98
---
 pjsip/include/pjsip/sip_config.h | 22 ++++++++++++++++++++++
 pjsip/src/pjsip/sip_config.c     |  3 ++-
 pjsip/src/pjsip/sip_util.c       | 22 ++++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/pjsip/include/pjsip/sip_config.h b/pjsip/include/pjsip/sip_config.h
index b72c6d02..bc895c59 100644
--- a/pjsip/include/pjsip/sip_config.h
+++ b/pjsip/include/pjsip/sip_config.h
@@ -120,6 +120,14 @@ typedef struct pjsip_cfg_t
 	 */
 	pj_bool_t follow_early_media_fork;
 
+	/**
+	 * Specify whether "alias" param should be added to the Via header
+	 * in any outgoing request with connection oriented transport.
+	 *
+	 * Default is PJSIP_REQ_HAS_VIA_ALIAS.
+	 */
+	pj_bool_t req_has_via_alias;
+
     } endpt;
 
     /** Transaction layer settings. */
@@ -315,6 +323,20 @@ PJ_INLINE(pjsip_cfg_t*) pjsip_cfg(void)
 #endif
 
 
+/**
+ * Specify whether "alias" param should be added to the Via header
+ * in any outgoing request with connection oriented transport.
+ *
+ * This option can also be controlled at run-time by the
+ * \a req_has_via_alias setting in pjsip_cfg_t.
+ *
+ * Default is PJ_TRUE.
+ */
+#ifndef PJSIP_REQ_HAS_VIA_ALIAS
+#   define PJSIP_REQ_HAS_VIA_ALIAS		    PJ_TRUE
+#endif
+
+
 /**
  * Accept call replace in early state when invite is not initiated
  * by the user agent. RFC 3891 Section 3 disallows this, however,
diff --git a/pjsip/src/pjsip/sip_config.c b/pjsip/src/pjsip/sip_config.c
index 8c0dac1d..dacc2f82 100644
--- a/pjsip/src/pjsip/sip_config.c
+++ b/pjsip/src/pjsip/sip_config.c
@@ -30,7 +30,8 @@ pjsip_cfg_t pjsip_sip_cfg_var =
        0,
        0,
        PJSIP_DONT_SWITCH_TO_TCP,
-       PJSIP_FOLLOW_EARLY_MEDIA_FORK
+       PJSIP_FOLLOW_EARLY_MEDIA_FORK,
+       PJSIP_REQ_HAS_VIA_ALIAS
     },
 
     /* Transaction settings */
diff --git a/pjsip/src/pjsip/sip_util.c b/pjsip/src/pjsip/sip_util.c
index ed4fd9c0..411251d0 100644
--- a/pjsip/src/pjsip/sip_util.c
+++ b/pjsip/src/pjsip/sip_util.c
@@ -1201,6 +1201,28 @@ static void stateless_send_transport_cb( void *token,
         }
 	via->rport_param = pjsip_cfg()->endpt.disable_rport ? -1 : 0;
 
+	/* Add/remove "alias" param to/from Via header on connection 
+	 * oriented/less transport, if configured.
+	 */
+	if (pjsip_cfg()->endpt.req_has_via_alias &&
+	    tdata->msg->type == PJSIP_REQUEST_MSG)
+	{
+	    const pj_str_t ALIAS_STR = {"alias", 5};
+	    pjsip_param *alias_param;
+	    pj_bool_t is_datagram;
+
+	    alias_param = pjsip_param_find(&via->other_param, &ALIAS_STR);
+	    is_datagram = (stateless_data->cur_transport->flag & 
+			   PJSIP_TRANSPORT_DATAGRAM);
+	    if (!is_datagram && !alias_param) {
+		alias_param = PJ_POOL_ZALLOC_T(tdata->pool, pjsip_param);
+		alias_param->name = ALIAS_STR;
+		pj_list_push_back(&via->other_param, alias_param);
+	    } else if (is_datagram && alias_param) {
+		pj_list_erase(alias_param);
+	    }
+	}
+
 	pjsip_tx_data_invalidate_msg(tdata);
 
 	/* Send message using this transport. */
-- 
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