Merge branch 'feature/establish-an-upstream-relationship-with-ics-openvpn-codebase-#5381' into develop

1 files changed, 1051 insertions, 22 deletions

diff --git a/app/openssl/crypto/bio/bss_dgram.c b/app/openssl/crypto/bio/bss_dgram.c
index 71ebe987..54c012c4 100644
--- a/app/openssl/crypto/bio/bss_dgram.c
+++ b/app/openssl/crypto/bio/bss_dgram.c
@@ -70,10 +70,27 @@
 #include <sys/timeb.h>
 #endif
 
-#ifdef OPENSSL_SYS_LINUX
+#ifndef OPENSSL_NO_SCTP
+#include <netinet/sctp.h>
+#include <fcntl.h>
+#define OPENSSL_SCTP_DATA_CHUNK_TYPE            0x00
+#define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
+#endif
+
+#if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
 #define IP_MTU      14 /* linux is lame */
 #endif
 
+#if defined(__FreeBSD__) && defined(IN6_IS_ADDR_V4MAPPED)
+/* Standard definition causes type-punning problems. */
+#undef IN6_IS_ADDR_V4MAPPED
+#define s6_addr32 __u6_addr.__u6_addr32
+#define IN6_IS_ADDR_V4MAPPED(a)               \
+        (((a)->s6_addr32[0] == 0) &&          \
+         ((a)->s6_addr32[1] == 0) &&          \
+         ((a)->s6_addr32[2] == htonl(0x0000ffff)))
+#endif
+
 #ifdef WATT32
 #define sock_write SockWrite  /* Watt-32 uses same names */
 #define sock_read  SockRead
@@ -88,6 +105,18 @@ static int dgram_new(BIO *h);
 static int dgram_free(BIO *data);
 static int dgram_clear(BIO *bio);
 
+#ifndef OPENSSL_NO_SCTP
+static int dgram_sctp_write(BIO *h, const char *buf, int num);
+static int dgram_sctp_read(BIO *h, char *buf, int size);
+static int dgram_sctp_puts(BIO *h, const char *str);
+static long dgram_sctp_ctrl(BIO *h, int cmd, long arg1, void *arg2);
+static int dgram_sctp_new(BIO *h);
+static int dgram_sctp_free(BIO *data);
+#ifdef SCTP_AUTHENTICATION_EVENT
+static void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp);
+#endif
+#endif
+
 static int BIO_dgram_should_retry(int s);
 
 static void get_current_time(struct timeval *t);
@@ -106,6 +135,22 @@ static BIO_METHOD methods_dgramp=
 	NULL,
 	};
 
+#ifndef OPENSSL_NO_SCTP
+static BIO_METHOD methods_dgramp_sctp=
+	{
+	BIO_TYPE_DGRAM_SCTP,
+	"datagram sctp socket",
+	dgram_sctp_write,
+	dgram_sctp_read,
+	dgram_sctp_puts,
+	NULL, /* dgram_gets, */
+	dgram_sctp_ctrl,
+	dgram_sctp_new,
+	dgram_sctp_free,
+	NULL,
+	};
+#endif
+
 typedef struct bio_dgram_data_st
 	{
 	union {
@@ -122,6 +167,40 @@ typedef struct bio_dgram_data_st
 	struct timeval socket_timeout;
 	} bio_dgram_data;
 
+#ifndef OPENSSL_NO_SCTP
+typedef struct bio_dgram_sctp_save_message_st
+	{
+        BIO *bio;
+        char *data;
+        int length;
+	} bio_dgram_sctp_save_message;
+
+typedef struct bio_dgram_sctp_data_st
+	{
+	union {
+		struct sockaddr sa;
+		struct sockaddr_in sa_in;
+#if OPENSSL_USE_IPV6
+		struct sockaddr_in6 sa_in6;
+#endif
+	} peer;
+	unsigned int connected;
+	unsigned int _errno;
+	unsigned int mtu;
+	struct bio_dgram_sctp_sndinfo sndinfo;
+	struct bio_dgram_sctp_rcvinfo rcvinfo;
+	struct bio_dgram_sctp_prinfo prinfo;
+	void (*handle_notifications)(BIO *bio, void *context, void *buf);
+	void* notification_context;
+	int in_handshake;
+	int ccs_rcvd;
+	int ccs_sent;
+	int save_shutdown;
+	int peer_auth_tested;
+	bio_dgram_sctp_save_message saved_message;
+	} bio_dgram_sctp_data;
+#endif
+
 BIO_METHOD *BIO_s_datagram(void)
 	{
 	return(&methods_dgramp);
@@ -186,7 +265,7 @@ static void dgram_adjust_rcv_timeout(BIO *b)
 	{
 #if defined(SO_RCVTIMEO)
 	bio_dgram_data *data = (bio_dgram_data *)b->ptr;
-	int sz = sizeof(int);
+	union { size_t s; int i; } sz = {0};
 
 	/* Is a timer active? */
 	if (data->next_timeout.tv_sec > 0 || data->next_timeout.tv_usec > 0)
@@ -196,8 +275,10 @@ static void dgram_adjust_rcv_timeout(BIO *b)
 		/* Read current socket timeout */
 #ifdef OPENSSL_SYS_WINDOWS
 		int timeout;
+
+		sz.i = sizeof(timeout);
 		if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
-					   (void*)&timeout, &sz) < 0)
+					   (void*)&timeout, &sz.i) < 0)
 			{ perror("getsockopt"); }
 		else
 			{
@@ -205,9 +286,12 @@ static void dgram_adjust_rcv_timeout(BIO *b)
 			data->socket_timeout.tv_usec = (timeout % 1000) * 1000;
 			}
 #else
+		sz.i = sizeof(data->socket_timeout);
 		if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 
 						&(data->socket_timeout), (void *)&sz) < 0)
 			{ perror("getsockopt"); }
+		else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
+			OPENSSL_assert(sz.s<=sizeof(data->socket_timeout));
 #endif
 
 		/* Get current time */
@@ -376,11 +460,10 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 	int *ip;
 	struct sockaddr *to = NULL;
 	bio_dgram_data *data = NULL;
-#if defined(IP_MTU_DISCOVER) || defined(IP_MTU)
-	long sockopt_val = 0;
-	unsigned int sockopt_len = 0;
-#endif
-#ifdef OPENSSL_SYS_LINUX
+#if defined(OPENSSL_SYS_LINUX) && (defined(IP_MTU_DISCOVER) || defined(IP_MTU))
+	int sockopt_val = 0;
+	socklen_t sockopt_len;	/* assume that system supporting IP_MTU is
+				 * modern enough to define socklen_t */
 	socklen_t addr_len;
 	union	{
 		struct sockaddr	sa;
@@ -462,7 +545,7 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 		break;
 		/* (Linux)kernel sets DF bit on outgoing IP packets */
 	case BIO_CTRL_DGRAM_MTU_DISCOVER:
-#ifdef OPENSSL_SYS_LINUX
+#if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
 		addr_len = (socklen_t)sizeof(addr);
 		memset((void *)&addr, 0, sizeof(addr));
 		if (getsockname(b->num, &addr.sa, &addr_len) < 0)
@@ -470,7 +553,6 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 			ret = 0;
 			break;
 			}
-		sockopt_len = sizeof(sockopt_val);
 		switch (addr.sa.sa_family)
 			{
 		case AF_INET:
@@ -479,7 +561,7 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 				&sockopt_val, sizeof(sockopt_val))) < 0)
 				perror("setsockopt");
 			break;
-#if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER)
+#if OPENSSL_USE_IPV6 && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
 		case AF_INET6:
 			sockopt_val = IPV6_PMTUDISC_DO;
 			if ((ret = setsockopt(b->num, IPPROTO_IPV6, IPV6_MTU_DISCOVER,
@@ -496,7 +578,7 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 		break;
 #endif
 	case BIO_CTRL_DGRAM_QUERY_MTU:
-#ifdef OPENSSL_SYS_LINUX
+#if defined(OPENSSL_SYS_LINUX) && defined(IP_MTU)
 		addr_len = (socklen_t)sizeof(addr);
 		memset((void *)&addr, 0, sizeof(addr));
 		if (getsockname(b->num, &addr.sa, &addr_len) < 0)
@@ -547,6 +629,27 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 		ret = 0;
 #endif
 		break;
+	case BIO_CTRL_DGRAM_GET_FALLBACK_MTU:
+		switch (data->peer.sa.sa_family)
+			{
+			case AF_INET:
+				ret = 576 - 20 - 8;
+				break;
+#if OPENSSL_USE_IPV6
+			case AF_INET6:
+#ifdef IN6_IS_ADDR_V4MAPPED
+				if (IN6_IS_ADDR_V4MAPPED(&data->peer.sa_in6.sin6_addr))
+					ret = 576 - 20 - 8;
+				else
+#endif
+					ret = 1280 - 40 - 8;
+				break;
+#endif
+			default:
+				ret = 576 - 20 - 8;
+				break;
+			}
+		break;
 	case BIO_CTRL_DGRAM_GET_MTU:
 		return data->mtu;
 		break;
@@ -637,12 +740,15 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 #endif
 		break;
 	case BIO_CTRL_DGRAM_GET_RECV_TIMEOUT:
-#ifdef OPENSSL_SYS_WINDOWS
 		{
-		int timeout, sz = sizeof(timeout);
+		union { size_t s; int i; } sz = {0};
+#ifdef OPENSSL_SYS_WINDOWS
+		int timeout;
 		struct timeval *tv = (struct timeval *)ptr;
+
+		sz.i = sizeof(timeout);
 		if (getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO,
-			(void*)&timeout, &sz) < 0)
+			(void*)&timeout, &sz.i) < 0)
 			{ perror("getsockopt"); ret = -1; }
 		else
 			{
@@ -650,12 +756,20 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 			tv->tv_usec = (timeout % 1000) * 1000;
 			ret = sizeof(*tv);
 			}
-		}
 #else
+		sz.i = sizeof(struct timeval);
 		if ( getsockopt(b->num, SOL_SOCKET, SO_RCVTIMEO, 
-			ptr, (void *)&ret) < 0)
+			ptr, (void *)&sz) < 0)
 			{ perror("getsockopt"); ret = -1; }
+		else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
+			{
+			OPENSSL_assert(sz.s<=sizeof(struct timeval));
+			ret = (int)sz.s;
+			}
+		else
+			ret = sz.i;
 #endif
+		}
 		break;
 #endif
 #if defined(SO_SNDTIMEO)
@@ -675,12 +789,15 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 #endif
 		break;
 	case BIO_CTRL_DGRAM_GET_SEND_TIMEOUT:
-#ifdef OPENSSL_SYS_WINDOWS
 		{
-		int timeout, sz = sizeof(timeout);
+		union { size_t s; int i; } sz = {0};
+#ifdef OPENSSL_SYS_WINDOWS
+		int timeout;
 		struct timeval *tv = (struct timeval *)ptr;
+
+		sz.i = sizeof(timeout);
 		if (getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO,
-			(void*)&timeout, &sz) < 0)
+			(void*)&timeout, &sz.i) < 0)
 			{ perror("getsockopt"); ret = -1; }
 		else
 			{
@@ -688,12 +805,20 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 			tv->tv_usec = (timeout % 1000) * 1000;
 			ret = sizeof(*tv);
 			}
-		}
 #else
+		sz.i = sizeof(struct timeval);
 		if ( getsockopt(b->num, SOL_SOCKET, SO_SNDTIMEO, 
-			ptr, (void *)&ret) < 0)
+			ptr, (void *)&sz) < 0)
 			{ perror("getsockopt"); ret = -1; }
+		else if (sizeof(sz.s)!=sizeof(sz.i) && sz.i==0)
+			{
+			OPENSSL_assert(sz.s<=sizeof(struct timeval));
+			ret = (int)sz.s;
+			}
+		else
+			ret = sz.i;
 #endif
+		}
 		break;
 #endif
 	case BIO_CTRL_DGRAM_GET_SEND_TIMER_EXP:
@@ -738,6 +863,910 @@ static int dgram_puts(BIO *bp, const char *str)
 	return(ret);
 	}
 
+#ifndef OPENSSL_NO_SCTP
+BIO_METHOD *BIO_s_datagram_sctp(void)
+	{
+	return(&methods_dgramp_sctp);
+	}
+
+BIO *BIO_new_dgram_sctp(int fd, int close_flag)
+	{
+	BIO *bio;
+	int ret, optval = 20000;
+	int auth_data = 0, auth_forward = 0;
+	unsigned char *p;
+	struct sctp_authchunk auth;
+	struct sctp_authchunks *authchunks;
+	socklen_t sockopt_len;
+#ifdef SCTP_AUTHENTICATION_EVENT
+#ifdef SCTP_EVENT
+	struct sctp_event event;
+#else
+	struct sctp_event_subscribe event;
+#endif
+#endif
+
+	bio=BIO_new(BIO_s_datagram_sctp());
+	if (bio == NULL) return(NULL);
+	BIO_set_fd(bio,fd,close_flag);
+
+	/* Activate SCTP-AUTH for DATA and FORWARD-TSN chunks */
+	auth.sauth_chunk = OPENSSL_SCTP_DATA_CHUNK_TYPE;
+	ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
+	OPENSSL_assert(ret >= 0);
+	auth.sauth_chunk = OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE;
+	ret = setsockopt(fd, IPPROTO_SCTP, SCTP_AUTH_CHUNK, &auth, sizeof(struct sctp_authchunk));
+	OPENSSL_assert(ret >= 0);
+
+	/* Test if activation was successful. When using accept(),
+	 * SCTP-AUTH has to be activated for the listening socket
+	 * already, otherwise the connected socket won't use it. */
+	sockopt_len = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
+	authchunks = OPENSSL_malloc(sockopt_len);
+	memset(authchunks, 0, sizeof(sockopt_len));
+	ret = getsockopt(fd, IPPROTO_SCTP, SCTP_LOCAL_AUTH_CHUNKS, authchunks, &sockopt_len);
+	OPENSSL_assert(ret >= 0);
+
+	for (p = (unsigned char*) authchunks->gauth_chunks;
+	     p < (unsigned char*) authchunks + sockopt_len;
+	     p += sizeof(uint8_t))
+		{
+		if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
+		if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
+		}
+		
+	OPENSSL_free(authchunks);
+
+	OPENSSL_assert(auth_data);
+	OPENSSL_assert(auth_forward);
+
+#ifdef SCTP_AUTHENTICATION_EVENT
+#ifdef SCTP_EVENT
+	memset(&event, 0, sizeof(struct sctp_event));
+	event.se_assoc_id = 0;
+	event.se_type = SCTP_AUTHENTICATION_EVENT;
+	event.se_on = 1;
+	ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
+	OPENSSL_assert(ret >= 0);
+#else
+	sockopt_len = (socklen_t) sizeof(struct sctp_event_subscribe);
+	ret = getsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, &sockopt_len);
+	OPENSSL_assert(ret >= 0);
+
+	event.sctp_authentication_event = 1;
+
+	ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
+	OPENSSL_assert(ret >= 0);
+#endif
+#endif
+
+	/* Disable partial delivery by setting the min size
+	 * larger than the max record size of 2^14 + 2048 + 13
+	 */
+	ret = setsockopt(fd, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT, &optval, sizeof(optval));
+	OPENSSL_assert(ret >= 0);
+
+	return(bio);
+	}
+
+int BIO_dgram_is_sctp(BIO *bio)
+	{
+	return (BIO_method_type(bio) == BIO_TYPE_DGRAM_SCTP);
+	}
+
+static int dgram_sctp_new(BIO *bi)
+	{
+	bio_dgram_sctp_data *data = NULL;
+
+	bi->init=0;
+	bi->num=0;
+	data = OPENSSL_malloc(sizeof(bio_dgram_sctp_data));
+	if (data == NULL)
+		return 0;
+	memset(data, 0x00, sizeof(bio_dgram_sctp_data));
+#ifdef SCTP_PR_SCTP_NONE
+	data->prinfo.pr_policy = SCTP_PR_SCTP_NONE;
+#endif
+    bi->ptr = data;
+
+	bi->flags=0;
+	return(1);
+	}
+
+static int dgram_sctp_free(BIO *a)
+	{
+	bio_dgram_sctp_data *data;
+
+	if (a == NULL) return(0);
+	if ( ! dgram_clear(a))
+		return 0;
+
+	data = (bio_dgram_sctp_data *)a->ptr;
+	if(data != NULL) OPENSSL_free(data);
+
+	return(1);
+	}
+
+#ifdef SCTP_AUTHENTICATION_EVENT
+void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
+	{
+	int ret;
+	struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
+
+	if (authkeyevent->auth_indication == SCTP_AUTH_FREE_KEY)
+		{
+		struct sctp_authkeyid authkeyid;
+
+		/* delete key */
+		authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
+		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
+		      &authkeyid, sizeof(struct sctp_authkeyid));
+		}
+	}
+#endif
+
+static int dgram_sctp_read(BIO *b, char *out, int outl)
+	{
+	int ret = 0, n = 0, i, optval;
+	socklen_t optlen;
+	bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
+	union sctp_notification *snp;
+	struct msghdr msg;
+	struct iovec iov;
+	struct cmsghdr *cmsg;
+	char cmsgbuf[512];
+
+	if (out != NULL)
+		{
+		clear_socket_error();
+
+		do
+			{
+			memset(&data->rcvinfo, 0x00, sizeof(struct bio_dgram_sctp_rcvinfo));
+			iov.iov_base = out;
+			iov.iov_len = outl;
+			msg.msg_name = NULL;
+			msg.msg_namelen = 0;
+			msg.msg_iov = &iov;
+			msg.msg_iovlen = 1;
+			msg.msg_control = cmsgbuf;
+			msg.msg_controllen = 512;
+			msg.msg_flags = 0;
+			n = recvmsg(b->num, &msg, 0);
+
+			if (msg.msg_controllen > 0)
+				{
+				for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg))
+					{
+					if (cmsg->cmsg_level != IPPROTO_SCTP)
+						continue;
+#ifdef SCTP_RCVINFO
+					if (cmsg->cmsg_type == SCTP_RCVINFO)
+						{
+						struct sctp_rcvinfo *rcvinfo;
+
+						rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmsg);
+						data->rcvinfo.rcv_sid = rcvinfo->rcv_sid;
+						data->rcvinfo.rcv_ssn = rcvinfo->rcv_ssn;
+						data->rcvinfo.rcv_flags = rcvinfo->rcv_flags;
+						data->rcvinfo.rcv_ppid = rcvinfo->rcv_ppid;
+						data->rcvinfo.rcv_tsn = rcvinfo->rcv_tsn;
+						data->rcvinfo.rcv_cumtsn = rcvinfo->rcv_cumtsn;
+						data->rcvinfo.rcv_context = rcvinfo->rcv_context;
+						}
+#endif
+#ifdef SCTP_SNDRCV
+					if (cmsg->cmsg_type == SCTP_SNDRCV)
+						{
+						struct sctp_sndrcvinfo *sndrcvinfo;
+
+						sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+						data->rcvinfo.rcv_sid = sndrcvinfo->sinfo_stream;
+						data->rcvinfo.rcv_ssn = sndrcvinfo->sinfo_ssn;
+						data->rcvinfo.rcv_flags = sndrcvinfo->sinfo_flags;
+						data->rcvinfo.rcv_ppid = sndrcvinfo->sinfo_ppid;
+						data->rcvinfo.rcv_tsn = sndrcvinfo->sinfo_tsn;
+						data->rcvinfo.rcv_cumtsn = sndrcvinfo->sinfo_cumtsn;
+						data->rcvinfo.rcv_context = sndrcvinfo->sinfo_context;
+						}
+#endif
+					}
+				}
+
+			if (n <= 0)
+				{
+				if (n < 0)
+					ret = n;
+				break;
+				}
+
+			if (msg.msg_flags & MSG_NOTIFICATION)
+				{
+				snp = (union sctp_notification*) out;
+				if (snp->sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
+					{
+#ifdef SCTP_EVENT
+					struct sctp_event event;
+#else
+					struct sctp_event_subscribe event;
+					socklen_t eventsize;
+#endif
+					/* If a message has been delayed until the socket
+					 * is dry, it can be sent now.
+					 */
+					if (data->saved_message.length > 0)
+						{
+						dgram_sctp_write(data->saved_message.bio, data->saved_message.data,
+						                 data->saved_message.length);
+						OPENSSL_free(data->saved_message.data);
+						data->saved_message.length = 0;
+						}
+
+					/* disable sender dry event */
+#ifdef SCTP_EVENT
+					memset(&event, 0, sizeof(struct sctp_event));
+					event.se_assoc_id = 0;
+					event.se_type = SCTP_SENDER_DRY_EVENT;
+					event.se_on = 0;
+					i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
+					OPENSSL_assert(i >= 0);
+#else
+					eventsize = sizeof(struct sctp_event_subscribe);
+					i = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
+					OPENSSL_assert(i >= 0);
+
+					event.sctp_sender_dry_event = 0;
+
+					i = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
+					OPENSSL_assert(i >= 0);
+#endif
+					}
+
+#ifdef SCTP_AUTHENTICATION_EVENT
+				if (snp->sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
+					dgram_sctp_handle_auth_free_key_event(b, snp);
+#endif
+
+				if (data->handle_notifications != NULL)
+					data->handle_notifications(b, data->notification_context, (void*) out);
+
+				memset(out, 0, outl);
+				}
+			else
+				ret += n;
+			}
+		while ((msg.msg_flags & MSG_NOTIFICATION) && (msg.msg_flags & MSG_EOR) && (ret < outl));
+
+		if (ret > 0 && !(msg.msg_flags & MSG_EOR))
+			{
+			/* Partial message read, this should never happen! */
+
+			/* The buffer was too small, this means the peer sent
+			 * a message that was larger than allowed. */
+			if (ret == outl)
+				return -1;
+
+			/* Test if socket buffer can handle max record
+			 * size (2^14 + 2048 + 13)
+			 */
+			optlen = (socklen_t) sizeof(int);
+			ret = getsockopt(b->num, SOL_SOCKET, SO_RCVBUF, &optval, &optlen);
+			OPENSSL_assert(ret >= 0);
+			OPENSSL_assert(optval >= 18445);
+
+			/* Test if SCTP doesn't partially deliver below
+			 * max record size (2^14 + 2048 + 13)
+			 */
+			optlen = (socklen_t) sizeof(int);
+			ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_PARTIAL_DELIVERY_POINT,
+			                 &optval, &optlen);
+			OPENSSL_assert(ret >= 0);
+			OPENSSL_assert(optval >= 18445);
+
+			/* Partially delivered notification??? Probably a bug.... */
+			OPENSSL_assert(!(msg.msg_flags & MSG_NOTIFICATION));
+
+			/* Everything seems ok till now, so it's most likely
+			 * a message dropped by PR-SCTP.
+			 */
+			memset(out, 0, outl);
+			BIO_set_retry_read(b);
+			return -1;
+			}
+
+		BIO_clear_retry_flags(b);
+		if (ret < 0)
+			{
+			if (BIO_dgram_should_retry(ret))
+				{
+				BIO_set_retry_read(b);
+				data->_errno = get_last_socket_error();
+				}
+			}
+
+		/* Test if peer uses SCTP-AUTH before continuing */
+		if (!data->peer_auth_tested)
+			{
+			int ii, auth_data = 0, auth_forward = 0;
+			unsigned char *p;
+			struct sctp_authchunks *authchunks;
+
+			optlen = (socklen_t)(sizeof(sctp_assoc_t) + 256 * sizeof(uint8_t));
+			authchunks = OPENSSL_malloc(optlen);
+			memset(authchunks, 0, sizeof(optlen));
+			ii = getsockopt(b->num, IPPROTO_SCTP, SCTP_PEER_AUTH_CHUNKS, authchunks, &optlen);
+			OPENSSL_assert(ii >= 0);
+
+			for (p = (unsigned char*) authchunks->gauth_chunks;
+				 p < (unsigned char*) authchunks + optlen;
+				 p += sizeof(uint8_t))
+				{
+				if (*p == OPENSSL_SCTP_DATA_CHUNK_TYPE) auth_data = 1;
+				if (*p == OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE) auth_forward = 1;
+				}
+
+			OPENSSL_free(authchunks);
+
+			if (!auth_data || !auth_forward)
+				{
+				BIOerr(BIO_F_DGRAM_SCTP_READ,BIO_R_CONNECT_ERROR);
+				return -1;
+				}
+
+			data->peer_auth_tested = 1;
+			}
+		}
+	return(ret);
+	}
+
+static int dgram_sctp_write(BIO *b, const char *in, int inl)
+	{
+	int ret;
+	bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
+	struct bio_dgram_sctp_sndinfo *sinfo = &(data->sndinfo);
+	struct bio_dgram_sctp_prinfo *pinfo = &(data->prinfo);
+	struct bio_dgram_sctp_sndinfo handshake_sinfo;
+	struct iovec iov[1];
+	struct msghdr msg;
+	struct cmsghdr *cmsg;
+#if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
+	char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo)) + CMSG_SPACE(sizeof(struct sctp_prinfo))];
+	struct sctp_sndinfo *sndinfo;
+	struct sctp_prinfo *prinfo;
+#else
+	char cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
+	struct sctp_sndrcvinfo *sndrcvinfo;
+#endif
+
+	clear_socket_error();
+
+	/* If we're send anything else than application data,
+	 * disable all user parameters and flags.
+	 */
+	if (in[0] != 23) {
+		memset(&handshake_sinfo, 0x00, sizeof(struct bio_dgram_sctp_sndinfo));
+#ifdef SCTP_SACK_IMMEDIATELY
+		handshake_sinfo.snd_flags = SCTP_SACK_IMMEDIATELY;
+#endif
+		sinfo = &handshake_sinfo;
+	}
+
+	/* If we have to send a shutdown alert message and the
+	 * socket is not dry yet, we have to save it and send it
+	 * as soon as the socket gets dry.
+	 */
+	if (data->save_shutdown && !BIO_dgram_sctp_wait_for_dry(b))
+	{
+		data->saved_message.bio = b;
+		data->saved_message.length = inl;
+		data->saved_message.data = OPENSSL_malloc(inl);
+		memcpy(data->saved_message.data, in, inl);
+		return inl;
+	}
+
+	iov[0].iov_base = (char *)in;
+	iov[0].iov_len = inl;
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_iov = iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = (caddr_t)cmsgbuf;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+#if defined(SCTP_SNDINFO) && defined(SCTP_PRINFO)
+	cmsg = (struct cmsghdr *)cmsgbuf;
+	cmsg->cmsg_level = IPPROTO_SCTP;
+	cmsg->cmsg_type = SCTP_SNDINFO;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndinfo));
+	sndinfo = (struct sctp_sndinfo *)CMSG_DATA(cmsg);
+	memset(sndinfo, 0, sizeof(struct sctp_sndinfo));
+	sndinfo->snd_sid = sinfo->snd_sid;
+	sndinfo->snd_flags = sinfo->snd_flags;
+	sndinfo->snd_ppid = sinfo->snd_ppid;
+	sndinfo->snd_context = sinfo->snd_context;
+	msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndinfo));
+
+	cmsg = (struct cmsghdr *)&cmsgbuf[CMSG_SPACE(sizeof(struct sctp_sndinfo))];
+	cmsg->cmsg_level = IPPROTO_SCTP;
+	cmsg->cmsg_type = SCTP_PRINFO;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_prinfo));
+	prinfo = (struct sctp_prinfo *)CMSG_DATA(cmsg);
+	memset(prinfo, 0, sizeof(struct sctp_prinfo));
+	prinfo->pr_policy = pinfo->pr_policy;
+	prinfo->pr_value = pinfo->pr_value;
+	msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_prinfo));
+#else
+	cmsg = (struct cmsghdr *)cmsgbuf;
+	cmsg->cmsg_level = IPPROTO_SCTP;
+	cmsg->cmsg_type = SCTP_SNDRCV;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
+	sndrcvinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+	memset(sndrcvinfo, 0, sizeof(struct sctp_sndrcvinfo));
+	sndrcvinfo->sinfo_stream = sinfo->snd_sid;
+	sndrcvinfo->sinfo_flags = sinfo->snd_flags;
+#ifdef __FreeBSD__
+	sndrcvinfo->sinfo_flags |= pinfo->pr_policy;
+#endif
+	sndrcvinfo->sinfo_ppid = sinfo->snd_ppid;
+	sndrcvinfo->sinfo_context = sinfo->snd_context;
+	sndrcvinfo->sinfo_timetolive = pinfo->pr_value;
+	msg.msg_controllen += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
+#endif
+
+	ret = sendmsg(b->num, &msg, 0);
+
+	BIO_clear_retry_flags(b);
+	if (ret <= 0)
+		{
+		if (BIO_dgram_should_retry(ret))
+			{
+			BIO_set_retry_write(b);  
+			data->_errno = get_last_socket_error();
+			}
+		}
+	return(ret);
+	}
+
+static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
+	{
+	long ret=1;
+	bio_dgram_sctp_data *data = NULL;
+	socklen_t sockopt_len = 0;
+	struct sctp_authkeyid authkeyid;
+	struct sctp_authkey *authkey;
+
+	data = (bio_dgram_sctp_data *)b->ptr;
+
+	switch (cmd)
+		{
+	case BIO_CTRL_DGRAM_QUERY_MTU:
+		/* Set to maximum (2^14)
+		 * and ignore user input to enable transport
+		 * protocol fragmentation.
+		 * Returns always 2^14.
+		 */
+		data->mtu = 16384;
+		ret = data->mtu;
+		break;
+	case BIO_CTRL_DGRAM_SET_MTU:
+		/* Set to maximum (2^14)
+		 * and ignore input to enable transport
+		 * protocol fragmentation.
+		 * Returns always 2^14.
+		 */
+		data->mtu = 16384;
+		ret = data->mtu;
+		break;
+	case BIO_CTRL_DGRAM_SET_CONNECTED:
+	case BIO_CTRL_DGRAM_CONNECT:
+		/* Returns always -1. */
+		ret = -1;
+		break;
+	case BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT:
+		/* SCTP doesn't need the DTLS timer
+		 * Returns always 1.
+		 */
+		break;
+	case BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE:
+		if (num > 0)
+			data->in_handshake = 1;
+		else
+			data->in_handshake = 0;
+
+		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_NODELAY, &data->in_handshake, sizeof(int));
+		break;
+	case BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY:
+		/* New shared key for SCTP AUTH.
+		 * Returns 0 on success, -1 otherwise.
+		 */
+
+		/* Get active key */
+		sockopt_len = sizeof(struct sctp_authkeyid);
+		ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
+		if (ret < 0) break;
+
+		/* Add new key */
+		sockopt_len = sizeof(struct sctp_authkey) + 64 * sizeof(uint8_t);
+		authkey = OPENSSL_malloc(sockopt_len);
+		memset(authkey, 0x00, sockopt_len);
+		authkey->sca_keynumber = authkeyid.scact_keynumber + 1;
+#ifndef __FreeBSD__
+		/* This field is missing in FreeBSD 8.2 and earlier,
+		 * and FreeBSD 8.3 and higher work without it.
+		 */
+		authkey->sca_keylength = 64;
+#endif
+		memcpy(&authkey->sca_key[0], ptr, 64 * sizeof(uint8_t));
+
+		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_KEY, authkey, sockopt_len);
+		if (ret < 0) break;
+
+		/* Reset active key */
+		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
+		      &authkeyid, sizeof(struct sctp_authkeyid));
+		if (ret < 0) break;
+
+		break;
+	case BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY:
+		/* Returns 0 on success, -1 otherwise. */
+
+		/* Get active key */
+		sockopt_len = sizeof(struct sctp_authkeyid);
+		ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
+		if (ret < 0) break;
+
+		/* Set active key */
+		authkeyid.scact_keynumber = authkeyid.scact_keynumber + 1;
+		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY,
+		      &authkeyid, sizeof(struct sctp_authkeyid));
+		if (ret < 0) break;
+
+		/* CCS has been sent, so remember that and fall through
+		 * to check if we need to deactivate an old key
+		 */
+		data->ccs_sent = 1;
+
+	case BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD:
+		/* Returns 0 on success, -1 otherwise. */
+
+		/* Has this command really been called or is this just a fall-through? */
+		if (cmd == BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD)
+			data->ccs_rcvd = 1;
+
+		/* CSS has been both, received and sent, so deactivate an old key */
+		if (data->ccs_rcvd == 1 && data->ccs_sent == 1)
+			{
+			/* Get active key */
+			sockopt_len = sizeof(struct sctp_authkeyid);
+			ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_ACTIVE_KEY, &authkeyid, &sockopt_len);
+			if (ret < 0) break;
+
+			/* Deactivate key or delete second last key if
+			 * SCTP_AUTHENTICATION_EVENT is not available.
+			 */
+			authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
+#ifdef SCTP_AUTH_DEACTIVATE_KEY
+			sockopt_len = sizeof(struct sctp_authkeyid);
+			ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DEACTIVATE_KEY,
+			      &authkeyid, sockopt_len);
+			if (ret < 0) break;
+#endif
+#ifndef SCTP_AUTHENTICATION_EVENT
+			if (authkeyid.scact_keynumber > 0)
+				{
+				authkeyid.scact_keynumber = authkeyid.scact_keynumber - 1;
+				ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
+					  &authkeyid, sizeof(struct sctp_authkeyid));
+				if (ret < 0) break;
+				}
+#endif
+
+			data->ccs_rcvd = 0;
+			data->ccs_sent = 0;
+			}
+		break;
+	case BIO_CTRL_DGRAM_SCTP_GET_SNDINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
+			num = sizeof(struct bio_dgram_sctp_sndinfo);
+
+		memcpy(ptr, &(data->sndinfo), num);
+		ret = num;
+		break;
+	case BIO_CTRL_DGRAM_SCTP_SET_SNDINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_sndinfo))
+			num = sizeof(struct bio_dgram_sctp_sndinfo);
+
+		memcpy(&(data->sndinfo), ptr, num);
+		break;
+	case BIO_CTRL_DGRAM_SCTP_GET_RCVINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
+			num = sizeof(struct bio_dgram_sctp_rcvinfo);
+
+		memcpy(ptr, &data->rcvinfo, num);
+
+		ret = num;
+		break;
+	case BIO_CTRL_DGRAM_SCTP_SET_RCVINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_rcvinfo))
+			num = sizeof(struct bio_dgram_sctp_rcvinfo);
+
+		memcpy(&(data->rcvinfo), ptr, num);
+		break;
+	case BIO_CTRL_DGRAM_SCTP_GET_PRINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
+			num = sizeof(struct bio_dgram_sctp_prinfo);
+
+		memcpy(ptr, &(data->prinfo), num);
+		ret = num;
+		break;
+	case BIO_CTRL_DGRAM_SCTP_SET_PRINFO:
+		/* Returns the size of the copied struct. */
+		if (num > (long) sizeof(struct bio_dgram_sctp_prinfo))
+			num = sizeof(struct bio_dgram_sctp_prinfo);
+
+		memcpy(&(data->prinfo), ptr, num);
+		break;
+	case BIO_CTRL_DGRAM_SCTP_SAVE_SHUTDOWN:
+		/* Returns always 1. */
+		if (num > 0)
+			data->save_shutdown = 1;
+		else
+			data->save_shutdown = 0;
+		break;
+
+	default:
+		/* Pass to default ctrl function to
+		 * process SCTP unspecific commands
+		 */
+		ret=dgram_ctrl(b, cmd, num, ptr);
+		break;
+		}
+	return(ret);
+	}
+
+int BIO_dgram_sctp_notification_cb(BIO *b,
+                                   void (*handle_notifications)(BIO *bio, void *context, void *buf),
+                                   void *context)
+	{
+	bio_dgram_sctp_data *data = (bio_dgram_sctp_data *) b->ptr;
+
+	if (handle_notifications != NULL)
+		{
+		data->handle_notifications = handle_notifications;
+		data->notification_context = context;
+		}
+	else
+		return -1;
+
+	return 0;
+	}
+
+int BIO_dgram_sctp_wait_for_dry(BIO *b)
+{
+	int is_dry = 0;
+	int n, sockflags, ret;
+	union sctp_notification snp;
+	struct msghdr msg;
+	struct iovec iov;
+#ifdef SCTP_EVENT
+	struct sctp_event event;
+#else
+	struct sctp_event_subscribe event;
+	socklen_t eventsize;
+#endif
+	bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
+
+	/* set sender dry event */
+#ifdef SCTP_EVENT
+	memset(&event, 0, sizeof(struct sctp_event));
+	event.se_assoc_id = 0;
+	event.se_type = SCTP_SENDER_DRY_EVENT;
+	event.se_on = 1;
+	ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
+#else
+	eventsize = sizeof(struct sctp_event_subscribe);
+	ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
+	if (ret < 0)
+		return -1;
+	
+	event.sctp_sender_dry_event = 1;
+	
+	ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
+#endif
+	if (ret < 0)
+		return -1;
+
+	/* peek for notification */
+	memset(&snp, 0x00, sizeof(union sctp_notification));
+	iov.iov_base = (char *)&snp;
+	iov.iov_len = sizeof(union sctp_notification);
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = NULL;
+	msg.msg_controllen = 0;
+	msg.msg_flags = 0;
+
+	n = recvmsg(b->num, &msg, MSG_PEEK);
+	if (n <= 0)
+		{
+		if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
+			return -1;
+		else
+			return 0;
+		}
+
+	/* if we find a notification, process it and try again if necessary */
+	while (msg.msg_flags & MSG_NOTIFICATION)
+		{
+		memset(&snp, 0x00, sizeof(union sctp_notification));
+		iov.iov_base = (char *)&snp;
+		iov.iov_len = sizeof(union sctp_notification);
+		msg.msg_name = NULL;
+		msg.msg_namelen = 0;
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+		msg.msg_control = NULL;
+		msg.msg_controllen = 0;
+		msg.msg_flags = 0;
+
+		n = recvmsg(b->num, &msg, 0);
+		if (n <= 0)
+			{
+			if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
+				return -1;
+			else
+				return is_dry;
+			}
+		
+		if (snp.sn_header.sn_type == SCTP_SENDER_DRY_EVENT)
+			{
+			is_dry = 1;
+
+			/* disable sender dry event */
+#ifdef SCTP_EVENT
+			memset(&event, 0, sizeof(struct sctp_event));
+			event.se_assoc_id = 0;
+			event.se_type = SCTP_SENDER_DRY_EVENT;
+			event.se_on = 0;
+			ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENT, &event, sizeof(struct sctp_event));
+#else
+			eventsize = (socklen_t) sizeof(struct sctp_event_subscribe);
+			ret = getsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, &eventsize);
+			if (ret < 0)
+				return -1;
+
+			event.sctp_sender_dry_event = 0;
+
+			ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_EVENTS, &event, sizeof(struct sctp_event_subscribe));
+#endif
+			if (ret < 0)
+				return -1;
+			}
+
+#ifdef SCTP_AUTHENTICATION_EVENT
+		if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
+			dgram_sctp_handle_auth_free_key_event(b, &snp);
+#endif
+
+		if (data->handle_notifications != NULL)
+			data->handle_notifications(b, data->notification_context, (void*) &snp);
+
+		/* found notification, peek again */
+		memset(&snp, 0x00, sizeof(union sctp_notification));
+		iov.iov_base = (char *)&snp;
+		iov.iov_len = sizeof(union sctp_notification);
+		msg.msg_name = NULL;
+		msg.msg_namelen = 0;
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+		msg.msg_control = NULL;
+		msg.msg_controllen = 0;
+		msg.msg_flags = 0;
+
+		/* if we have seen the dry already, don't wait */
+		if (is_dry)
+			{
+			sockflags = fcntl(b->num, F_GETFL, 0);
+			fcntl(b->num, F_SETFL, O_NONBLOCK);
+			}
+
+		n = recvmsg(b->num, &msg, MSG_PEEK);
+
+		if (is_dry)
+			{
+			fcntl(b->num, F_SETFL, sockflags);
+			}
+
+		if (n <= 0)
+			{
+			if ((n < 0) && (get_last_socket_error() != EAGAIN) && (get_last_socket_error() != EWOULDBLOCK))
+				return -1;
+			else
+				return is_dry;
+			}
+		}
+
+	/* read anything else */
+	return is_dry;
+}
+
+int BIO_dgram_sctp_msg_waiting(BIO *b)
+	{
+	int n, sockflags;
+	union sctp_notification snp;
+	struct msghdr msg;
+	struct iovec iov;
+	bio_dgram_sctp_data *data = (bio_dgram_sctp_data *)b->ptr;
+
+	/* Check if there are any messages waiting to be read */
+	do
+		{
+		memset(&snp, 0x00, sizeof(union sctp_notification));
+		iov.iov_base = (char *)&snp;
+		iov.iov_len = sizeof(union sctp_notification);
+		msg.msg_name = NULL;
+		msg.msg_namelen = 0;
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+		msg.msg_control = NULL;
+		msg.msg_controllen = 0;
+		msg.msg_flags = 0;
+
+		sockflags = fcntl(b->num, F_GETFL, 0);
+		fcntl(b->num, F_SETFL, O_NONBLOCK);
+		n = recvmsg(b->num, &msg, MSG_PEEK);
+		fcntl(b->num, F_SETFL, sockflags);
+
+		/* if notification, process and try again */
+		if (n > 0 && (msg.msg_flags & MSG_NOTIFICATION))
+			{
+#ifdef SCTP_AUTHENTICATION_EVENT
+			if (snp.sn_header.sn_type == SCTP_AUTHENTICATION_EVENT)
+				dgram_sctp_handle_auth_free_key_event(b, &snp);
+#endif
+
+			memset(&snp, 0x00, sizeof(union sctp_notification));
+			iov.iov_base = (char *)&snp;
+			iov.iov_len = sizeof(union sctp_notification);
+			msg.msg_name = NULL;
+			msg.msg_namelen = 0;
+			msg.msg_iov = &iov;
+			msg.msg_iovlen = 1;
+			msg.msg_control = NULL;
+			msg.msg_controllen = 0;
+			msg.msg_flags = 0;
+			n = recvmsg(b->num, &msg, 0);
+
+			if (data->handle_notifications != NULL)
+				data->handle_notifications(b, data->notification_context, (void*) &snp);
+			}
+
+		} while (n > 0 && (msg.msg_flags & MSG_NOTIFICATION));
+
+	/* Return 1 if there is a message to be read, return 0 otherwise. */
+	if (n > 0)
+		return 1;
+	else
+		return 0;
+	}
+
+static int dgram_sctp_puts(BIO *bp, const char *str)
+	{
+	int n,ret;
+
+	n=strlen(str);
+	ret=dgram_sctp_write(bp,str,n);
+	return(ret);
+	}
+#endif
+
 static int BIO_dgram_should_retry(int i)
 	{
 	int err;