bss_dgram.c: make getsockopt work in cases when optlen is 64-bit value.

crypto/bio/bss_dgram.c

@@ -77,11 +77,11 @@
 #define OPENSSL_SCTP_FORWARD_CUM_TSN_CHUNK_TYPE 0xc0
 #endif
 
-#ifdef OPENSSL_SYS_LINUX
+#if defined(OPENSSL_SYS_LINUX) && !defined(IP_MTU)
 #define IP_MTU      14 /* linux is lame */
 #endif
 
-#ifdef __FreeBSD__
+#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
@@ -265,7 +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)
@@ -275,6 +275,8 @@ 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)
 			{ perror("getsockopt"); }
@@ -284,9 +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 */
@@ -455,11 +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;
@@ -541,7 +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)
@@ -549,7 +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:
@@ -558,7 +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,
@@ -575,7 +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)
@@ -737,10 +740,13 @@ 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)
 			{ perror("getsockopt"); ret = -1; }
@@ -750,12 +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)
@@ -775,10 +789,13 @@ 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)
 			{ perror("getsockopt"); ret = -1; }
@@ -790,10 +807,19 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
 			}
 		}
 #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:
@@ -965,7 +991,6 @@ static int dgram_sctp_free(BIO *a)
 #ifdef SCTP_AUTHENTICATION_EVENT
 void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
 	{
-	unsigned int sockopt_len = 0;
 	int ret;
 	struct sctp_authkey_event* authkeyevent = &snp->sn_auth_event;
 
@@ -975,9 +1000,8 @@ void dgram_sctp_handle_auth_free_key_event(BIO *b, union sctp_notification *snp)
 
 		/* delete key */
 		authkeyid.scact_keynumber = authkeyevent->auth_keynumber;
-		sockopt_len = sizeof(struct sctp_authkeyid);
 		ret = setsockopt(b->num, IPPROTO_SCTP, SCTP_AUTH_DELETE_KEY,
-		      &authkeyid, sockopt_len);
+		      &authkeyid, sizeof(struct sctp_authkeyid));
 		}
 	}
 #endif
@@ -1308,7 +1332,7 @@ static long dgram_sctp_ctrl(BIO *b, int cmd, long num, void *ptr)
 	{
 	long ret=1;
 	bio_dgram_sctp_data *data = NULL;
-	unsigned int sockopt_len = 0;
+	socklen_t sockopt_len = 0;
 	struct sctp_authkeyid authkeyid;
 	struct sctp_authkey *authkey;