[Asterisk-code-review] res/res pjsip: Fix localnet checks in pjsip, part 2. (asterisk[master])

[Joshua Colp]

Joshua Colp has submitted this change and it was merged. ( https://gerrit.asterisk.org/6471 )

Change subject: res/res_pjsip: Fix localnet checks in pjsip, part 2.
......................................................................

res/res_pjsip: Fix localnet checks in pjsip, part 2.

In 45744fc53, I mistakenly broke SDP media address rewriting by
misinterpreting which address was checked in the localnet comparison.

Instead of checking the remote peer address to decide whether we need
media address rewriting, we check our local media address: if it's
local, then we rewrite. This feels awkward, but works and even made
directmedia work properly if you set local_net. (For the record: for
local peers, the SDP media rewrite code is not called, so the
comparison does no harm there.)

ASTERISK-27248 #close

Change-Id: I566be1c33f4d0a689567d451ed46bab9c3861d4f
---
M res/res_pjsip_sdp_rtp.c
M res/res_pjsip_session.c
M res/res_pjsip_t38.c
3 files changed, 21 insertions(+), 11 deletions(-)

Approvals:
  Jenkins2: Verified
  Joshua Colp: Looks good to me, approved; Approved for Submit



diff --git a/res/res_pjsip_sdp_rtp.c b/res/res_pjsip_sdp_rtp.c
index 9110a1c..e095f06 100644
--- a/res/res_pjsip_sdp_rtp.c
+++ b/res/res_pjsip_sdp_rtp.c
@@ -1807,7 +1807,7 @@
 {
 	RAII_VAR(struct ast_sip_transport_state *, transport_state, ast_sip_get_transport_state(ast_sorcery_object_get_id(transport)), ao2_cleanup);
 	char host[NI_MAXHOST];
-	struct ast_sockaddr addr = { { 0, } };
+	struct ast_sockaddr our_sdp_addr = { { 0, } };
 
 	/* If the stream has been rejected there will be no connection line */
 	if (!stream->conn || !transport_state) {
@@ -1815,10 +1815,13 @@
 	}
 
 	ast_copy_pj_str(host, &stream->conn->addr, sizeof(host));
-	ast_sockaddr_parse(&addr, host, PARSE_PORT_FORBID);
+	ast_sockaddr_parse(&our_sdp_addr, host, PARSE_PORT_FORBID);
 
-	/* Is the address within the SDP inside the same network? */
-	if (ast_sip_transport_is_local(transport_state, &addr)) {
+	/* Reversed check here. We don't check the remote endpoint being
+	 * in our local net, but whether our outgoing session IP is
+	 * local. If it is not, we won't do rewriting. No localnet
+	 * configured? Always rewrite. */
+	if (ast_sip_transport_is_nonlocal(transport_state, &our_sdp_addr) && transport_state->localnet) {
 		return;
 	}
 	ast_debug(5, "Setting media address to %s\n", ast_sockaddr_stringify_host(&transport_state->external_media_address));
diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index b997024..64416a0 100644
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -3976,12 +3976,16 @@
 
 	if (sdp->conn) {
 		char host[NI_MAXHOST];
-		struct ast_sockaddr addr = { { 0, } };
+		struct ast_sockaddr our_sdp_addr = { { 0, } };
 
 		ast_copy_pj_str(host, &sdp->conn->addr, sizeof(host));
-		ast_sockaddr_parse(&addr, host, PARSE_PORT_FORBID);
+		ast_sockaddr_parse(&our_sdp_addr, host, PARSE_PORT_FORBID);
 
-		if (ast_sip_transport_is_nonlocal(transport_state, &addr)) {
+		/* Reversed check here. We don't check the remote
+		 * endpoint being in our local net, but whether our
+		 * outgoing session IP is local. If it is, we'll do
+		 * rewriting. No localnet configured? Always rewrite. */
+		if (ast_sip_transport_is_local(transport_state, &our_sdp_addr) || !transport_state->localnet) {
 			ast_debug(5, "Setting external media address to %s\n", ast_sockaddr_stringify_host(&transport_state->external_media_address));
 			pj_strdup2(tdata->pool, &sdp->conn->addr, ast_sockaddr_stringify_host(&transport_state->external_media_address));
 		}
diff --git a/res/res_pjsip_t38.c b/res/res_pjsip_t38.c
index 6dec6ef..48cbab3 100644
--- a/res/res_pjsip_t38.c
+++ b/res/res_pjsip_t38.c
@@ -952,7 +952,7 @@
 {
 	RAII_VAR(struct ast_sip_transport_state *, transport_state, ast_sip_get_transport_state(ast_sorcery_object_get_id(transport)), ao2_cleanup);
 	char host[NI_MAXHOST];
-	struct ast_sockaddr addr = { { 0, } };
+	struct ast_sockaddr our_sdp_addr = { { 0, } };
 
 	/* If the stream has been rejected there will be no connection line */
 	if (!stream->conn || !transport_state) {
@@ -960,10 +960,13 @@
 	}
 
 	ast_copy_pj_str(host, &stream->conn->addr, sizeof(host));
-	ast_sockaddr_parse(&addr, host, PARSE_PORT_FORBID);
+	ast_sockaddr_parse(&our_sdp_addr, host, PARSE_PORT_FORBID);
 
-	/* Is the address within the SDP inside the same network? */
-	if (ast_sip_transport_is_local(transport_state, &addr)) {
+	/* Reversed check here. We don't check the remote endpoint being
+	 * in our local net, but whether our outgoing session IP is
+	 * local. If it is not, we won't do rewriting. No localnet
+	 * configured? Always rewrite. */
+	if (ast_sip_transport_is_nonlocal(transport_state, &our_sdp_addr) && transport_state->localnet) {
 		return;
 	}
 	ast_debug(5, "Setting media address to %s\n", ast_sockaddr_stringify_host(&transport_state->external_media_address));

-- 
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Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I566be1c33f4d0a689567d451ed46bab9c3861d4f
Gerrit-Change-Number: 6471
Gerrit-PatchSet: 1
Gerrit-Owner: Walter Doekes <walter+asterisk at wjd.nu>
Gerrit-Reviewer: Jenkins2
Gerrit-Reviewer: Joshua Colp <jcolp at digium.com>
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