Index: netcat.c
===================================================================
--- netcat.c	(revision 253450)
+++ netcat.c	(working copy)
@@ -73,6 +73,7 @@
 #define UNIX_DG_TMP_SOCKET_SIZE	19
 
 /* Command Line Options */
+int Cflag;					/* SCTP - Default to TCP */
 int	dflag;					/* detached, no stdin */
 unsigned int iflag;				/* Interval Flag */
 int	kflag;					/* More than one connect */
@@ -154,7 +155,7 @@
 	sv = NULL;
 
 	while ((ch = getopt_long(argc, argv,
-	    "46DdEe:hI:i:klNnoO:P:p:rSs:tT:UuV:vw:X:x:z",
+	    "46CDdEe:hI:i:klNnoO:P:p:rSs:tT:UuV:vw:X:x:z",
 	    longopts, NULL)) != -1) {
 		switch (ch) {
 		case '4':
@@ -176,6 +177,9 @@
 			else
 				errx(1, "unsupported proxy protocol");
 			break;
+		case 'C':
+			Cflag = 1;
+			break;
 		case 'd':
 			dflag = 1;
 			break;
@@ -316,6 +320,8 @@
 	} else
 		usage(1);
 
+	if (Cflag && uflag)
+		errx(1, "cannot use -C and -u");
 	if (lflag && sflag)
 		errx(1, "cannot use -s and -l");
 	if (lflag && pflag)
@@ -342,8 +348,13 @@
 	if (family != AF_UNIX) {
 		memset(&hints, 0, sizeof(struct addrinfo));
 		hints.ai_family = family;
-		hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
-		hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
+		hints.ai_socktype = (Cflag || !uflag) ? SOCK_STREAM : SOCK_DGRAM;
+		if(uflag)
+			hints.ai_protocol = IPPROTO_UDP;
+		else if(Cflag)
+			hints.ai_protocol = IPPROTO_SCTP;
+		else
+			hints.ai_protocol = IPPROTO_TCP;
 		if (nflag)
 			hints.ai_flags |= AI_NUMERICHOST;
 	}
@@ -412,7 +423,7 @@
 				len = sizeof(z);
 				plen = 2048;
 				rv = recvfrom(s, buf, plen, MSG_PEEK,
-				    (struct sockaddr *)&z, &len);
+						(struct sockaddr *)&z, &len);
 				if (rv < 0)
 					err(1, "recvfrom");
 
@@ -427,10 +438,10 @@
 			} else {
 				len = sizeof(cliaddr);
 				connfd = accept(s, (struct sockaddr *)&cliaddr,
-				    &len);
+						&len);
 				if (connfd == -1) {
 					/* For now, all errnos are fatal */
-   					err(1, "accept");
+					err(1, "accept");
 				}
 				if (vflag)
 					report_connect((struct sockaddr *)&cliaddr, len);
@@ -646,8 +657,13 @@
 			setsockopt(s, IPPROTO_IP, IP_BINDANY, &on, sizeof(on));
 			memset(&ahints, 0, sizeof(struct addrinfo));
 			ahints.ai_family = res0->ai_family;
-			ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
-			ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
+			ahints.ai_socktype = (Cflag || !uflag) ? SOCK_STREAM : SOCK_DGRAM;
+			if(uflag)
+				ahints.ai_protocol = IPPROTO_UDP;
+			else if(Cflag)
+				ahints.ai_protocol = IPPROTO_SCTP;
+			else
+				ahints.ai_protocol = IPPROTO_TCP;
 			ahints.ai_flags = AI_PASSIVE;
 			if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
 				errx(1, "getaddrinfo: %s", gai_strerror(error));
@@ -1080,6 +1096,7 @@
 	fprintf(stderr, "\tCommand Summary:\n\
 	\t-4		Use IPv4\n\
 	\t-6		Use IPv6\n\
+	\t-C		SCTP mode\n\
 	\t-D		Enable the debug socket option\n\
 	\t-d		Detach from stdin\n");
 #ifdef IPSEC
@@ -1146,9 +1163,9 @@
 {
 	fprintf(stderr,
 #ifdef IPSEC
-	    "usage: nc [-46DdEhklNnrStUuvz] [-e policy] [-I length] [-i interval] [-O length]\n"
+	    "usage: nc [-46CDdEhklNnrStUuvz] [-e policy] [-I length] [-i interval] [-O length]\n"
 #else
-	    "usage: nc [-46DdhklNnrStUuvz] [-I length] [-i interval] [-O length]\n"
+	    "usage: nc [-46CDdhklNnrStUuvz] [-I length] [-i interval] [-O length]\n"
 #endif
 	    "\t  [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n"
 	    "\t  [-V rtable] [-w timeout] [-X proxy_protocol]\n"