OpenSolaris Launch

1 files changed, 127 insertions, 0 deletions

diff --git a/usr/src/lib/libsocket/inet/bindresvport.c b/usr/src/lib/libsocket/inet/bindresvport.c
new file mode 100644
index 0000000000..d3cc2f5b8a
--- /dev/null
+++ b/usr/src/lib/libsocket/inet/bindresvport.c
@@ -0,0 +1,127 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+/*
+ * Portions of this source code were derived from Berkeley 4.3 BSD
+ * under license from the Regents of the University of California.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <errno.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef SYSV
+#define	bzero(s, len)	(void) memset((s), 0, (len))
+#endif
+
+
+/*
+ * Bind a socket to a privileged IP port
+ */
+int
+bindresvport(int sd, struct sockaddr_in *sin)
+{
+	struct sockaddr_in myaddr;
+	struct sockaddr_in *bindaddr;
+	int level, optname;
+	int optval, len;
+	int ret;
+
+	bindaddr = sin;
+	if (bindaddr == (struct sockaddr_in *)0) {
+		bindaddr = &myaddr;
+		bzero(bindaddr, sizeof (*bindaddr));
+		bindaddr->sin_family = AF_INET;
+	} else if (bindaddr->sin_family != AF_INET) {
+		errno = EPFNOSUPPORT;
+		return (-1);
+	}
+
+	len = sizeof (optval);
+	if (getsockopt(sd, SOL_SOCKET, SO_TYPE, &optval, &len) < 0) {
+		return (-1);
+	}
+	/*
+	 * Use *_ANONPRIVBIND to ask the kernel to pick a port in the
+	 * priviledged range for us.
+	 */
+	if (optval == SOCK_STREAM) {
+		level = IPPROTO_TCP;
+		optname = TCP_ANONPRIVBIND;
+	} else if (optval == SOCK_DGRAM) {
+		level = IPPROTO_UDP;
+		optname = UDP_ANONPRIVBIND;
+	} else {
+		errno = EPROTONOSUPPORT;
+		return (-1);
+	}
+
+	optval = 1;
+	if (setsockopt(sd, level, optname, &optval, sizeof (optval)) < 0) {
+		return (-1);
+	}
+
+	bindaddr->sin_port = 0;
+	ret = bind(sd, (struct sockaddr *)bindaddr,
+	    sizeof (struct sockaddr_in));
+
+	/*
+	 * Always turn off the option when we are done.  Note that by doing
+	 * this, if the caller has set this option before calling
+	 * bindresvport(), it will be unset.  But this should never happen...
+	 */
+	optval = 0;
+	(void) setsockopt(sd, level, optname, &optval, sizeof (optval));
+
+	if (ret >= 0 && sin != NULL) {
+		/*
+		 * Historical note:
+		 *
+		 * Past versions of this bindresvport() code have
+		 * returned with the reserved port number bound
+		 * filled in its "sin" parameter (if passed in), perhaps
+		 * "accidently" because of the structure of historical code.
+		 *
+		 * This is not documented but the behavior is
+		 * explicitly retained here for compatibility to minimize
+		 * risk to applications, even though it is not clear if this
+		 * was a design intent.
+		 */
+		len = sizeof (struct sockaddr_in);
+		(void) getsockname(sd, (struct sockaddr *)bindaddr, &len);
+	}
+	return (ret);
+}