MT#55283 honour offerer_pref for RTP<>SRTP

Run the SDES reordering routine also when the opposite side is plain
RTP. Add a matching test case.

Ref: https://groups.google.com/g/rtpengine/c/pG6NB24G-BY
Change-Id: I7844290e85e44c1bba2c7665202b6259aead1028

daemon/call.c

@@ -1588,6 +1588,8 @@ static void __generate_crypto(const sdp_ng_flags *flags, struct call_media *this
 
 	if (!this->protocol || !this->protocol->srtp || MEDIA_ISSET(this, PASSTHRU)) {
 		crypto_params_sdes_queue_clear(cpq);
+		// reorder received SDES suites towards offerer based on preference
+		reorder_sdes_preferences(offered_cpq, offered_order);
 		/* clear crypto for the this leg b/c we are in passthrough mode */
 		MEDIA_CLEAR(this, DTLS);
 		MEDIA_CLEAR(this, SDES);

t/auto-daemon-tests.pl

@@ -17372,6 +17372,54 @@ SDP
 
 new_call;
 
+offer('SDES offerer preferences <> RTP', { ICE => 'remove', SDES => [ 'offerer_pref:AES_256_CM_HMAC_SHA1_32;AES_256_CM_HMAC_SHA1_80' ], 'transport-protocol' => 'RTP/AVP' }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio 2000 RTP/SAVP 0
+c=IN IP4 198.51.100.1
+a=sendrecv
+a=crypto:1 AEAD_AES_256_GCM inline:53P5CsePy3hFUcuqsizkCnTE+4OKa1cOGa2WXHjoN19ifpweerTLaj+9vxc
+a=crypto:2 AES_CM_128_HMAC_SHA1_80 inline:cJOJ7kxQjhFBp2fP6AYjs3vKw7CeBdWZCj0isbJv
+a=crypto:3 AES_CM_128_HMAC_SHA1_32 inline:VAzLKvoE3jG9cdH/AZsl/ZqWNXrUzyM4Gw6chrFr
+a=crypto:4 AES_256_CM_HMAC_SHA1_80 inline:8AbZePWwsKhLGX3GlXA+yHYPQ3cgraer/9DkFJYCOPZZy3o9wC0NIbIFYZfyHw==
+a=crypto:5 AES_256_CM_HMAC_SHA1_32 inline:2GLk3p/csdno4KlGO1TxCVaEt+bifmDlQ5NjnCb5cJYPURiGRSTBEtEq37db8g==
+----------------------------------
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.1
+s=tester
+t=0 0
+m=audio PORT RTP/AVP 0
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=sendrecv
+a=rtcp:PORT
+SDP
+
+answer('SDES offerer preferences <> RTP', { ICE => 'remove' }, <<SDP);
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.3
+s=tester
+t=0 0
+m=audio 2002 RTP/AVP 0
+c=IN IP4 198.51.100.3
+a=sendrecv
+--------------------------------------
+v=0
+o=- 1545997027 1 IN IP4 198.51.100.3
+s=tester
+t=0 0
+m=audio PORT RTP/SAVP 0
+c=IN IP4 203.0.113.1
+a=rtpmap:0 PCMU/8000
+a=sendrecv
+a=rtcp:PORT
+a=crypto:5 AES_256_CM_HMAC_SHA1_32 inline:CRYPTO256
+SDP
+
+new_call;
+
 offer('SDES offerer preferences, but one taken by recipient, nor in the offer, nor in preferences', { ICE => 'remove', DTLS => 'off', SDES => [ 'offerer_pref:AES_256_CM_HMAC_SHA1_32;AES_256_CM_HMAC_SHA1_80' ] }, <<SDP);
 v=0
 o=- 1545997027 1 IN IP4 198.51.100.1