Fix various in the udptl implementation. It could return empty modem frames, have an incorrect sequence number on packets, and display the wrong sequence number in the debug messages.

(closes issue #11228)
Reported by: Cache
Patches:
      udptl-4.patch uploaded by dimas (license 88)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@91450 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/udptl.c

@@ -98,7 +98,6 @@ struct ast_udptl {
 	struct sockaddr_in us;
 	struct sockaddr_in them;
 	int *ioid;
-	uint16_t seqno;
 	struct sched_context *sched;
 	struct io_context *io;
 	void *data;
@@ -336,7 +335,7 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 					s->f[ifp_no].subclass = AST_MODEM_T38;
 
 					s->f[ifp_no].mallocd = 0;
-					//s->f[ifp_no].???seq_no = seq_no - i;
+					s->f[ifp_no].seqno = seq_no - i;
 					s->f[ifp_no].datalen = lengths[i - 1];
 					s->f[ifp_no].data = (uint8_t *) bufs[i - 1];
 					s->f[ifp_no].offset = 0;
@@ -348,23 +347,6 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 				}
 			}
 		}
-		/* If packets are received out of sequence, we may have already processed this packet from the error
-		   recovery information in a packet already received. */
-		if (seq_no >= s->rx_seq_no) {
-			/* Decode the primary IFP packet */
-			s->f[ifp_no].frametype = AST_FRAME_MODEM;
-			s->f[ifp_no].subclass = AST_MODEM_T38;
-			
-			s->f[ifp_no].mallocd = 0;
-			//s->f[ifp_no].???seq_no = seq_no;
-			s->f[ifp_no].datalen = ifp_len;
-			s->f[ifp_no].data = (uint8_t *) ifp;
-			s->f[ifp_no].offset = 0;
-			s->f[ifp_no].src = "UDPTL";
-			if (ifp_no > 0)
-				AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
-			AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
-		}
 	}
 	else
 	{
@@ -455,7 +437,7 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 				s->f[ifp_no].subclass = AST_MODEM_T38;
 			
 				s->f[ifp_no].mallocd = 0;
-				//s->f[ifp_no].???seq_no = j;
+				s->f[ifp_no].seqno = j;
 				s->f[ifp_no].datalen = s->rx[l].buf_len;
 				s->f[ifp_no].data = s->rx[l].buf;
 				s->f[ifp_no].offset = 0;
@@ -466,12 +448,17 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 				ifp_no++;
 			}
 		}
+	}
+
+	/* If packets are received out of sequence, we may have already processed this packet from the error
+	   recovery information in a packet already received. */
+	if (seq_no >= s->rx_seq_no) {
 		/* Decode the primary IFP packet */
 		s->f[ifp_no].frametype = AST_FRAME_MODEM;
 		s->f[ifp_no].subclass = AST_MODEM_T38;
-			
+		
 		s->f[ifp_no].mallocd = 0;
-		//s->f[ifp_no].???seq_no = j;
+		s->f[ifp_no].seqno = seq_no;
 		s->f[ifp_no].datalen = ifp_len;
 		s->f[ifp_no].data = (uint8_t *) ifp;
 		s->f[ifp_no].offset = 0;
@@ -479,10 +466,12 @@ static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 		if (ifp_no > 0)
 			AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 		AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
+
+		ifp_no++;
 	}
 
 	s->rx_seq_no = seq_no + 1;
-	return 0;
+	return ifp_no;
 }
 /*- End of function --------------------------------------------------------*/
 
@@ -675,7 +664,8 @@ struct ast_frame *ast_udptl_read(struct ast_udptl *udptl)
 #if 0
 	printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res);
 #endif
-	udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res);
+	if (udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res) < 1)
+		return &ast_null_frame;
 
 	return &udptl->f[0];
 }
@@ -784,7 +774,6 @@ struct ast_udptl *ast_udptl_new_with_bindaddr(struct sched_context *sched, struc
 		udptl->tx[i].buf_len = -1;
 	}
 
-	udptl->seqno = ast_random() & 0xffff;
 	udptl->them.sin_family = AF_INET;
 	udptl->us.sin_family = AF_INET;
 
@@ -882,6 +871,7 @@ void ast_udptl_destroy(struct ast_udptl *udptl)
 
 int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
 {
+	int seq;
 	int len;
 	int res;
 	uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
@@ -899,6 +889,9 @@ int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
 		return -1;
 	}
 
+	/* Save seq_no for debug output because udptl_build_packet increments it */
+	seq = s->tx_seq_no & 0xFFFF;
+
 	/* Cook up the UDPTL packet, with the relevant EC info. */
 	len = udptl_build_packet(s, buf, f->data, f->datalen);
 
@@ -911,7 +904,7 @@ int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
 		if (udptl_debug_test_addr(&s->them))
 			ast_verbose("Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
 					ast_inet_ntoa(s->them.sin_addr),
-					ntohs(s->them.sin_port), 0, s->seqno, len);
+					ntohs(s->them.sin_port), 0, seq, len);
 	}
 		
 	return 0;