1 files changed, 114 insertions, 0 deletions
diff --git a/lib/libc/net/rresvport.c b/lib/libc/net/rresvport.c
new file mode 100644
index 00000000000..97a901ae0c8
--- /dev/null
+++ b/lib/libc/net/rresvport.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
+ * Copyright (c) 1983, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ *	This product includes software developed by Theo de Raadt.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: rresvport.c,v 1.1 1999/12/16 21:30:34 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <signal.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <netgroup.h>
+
+int
+rresvport(alport)
+	int *alport;
+{
+	return rresvport_af(alport, AF_INET);
+}
+
+
+int
+rresvport_af(alport, af)
+	int *alport;
+	int af;
+{
+	struct sockaddr_storage ss;
+	struct sockaddr *sa;
+	u_int16_t *portp;
+	int s;
+
+	bzero(&ss, sizeof ss);
+	sa = (struct sockaddr *)&ss;
+
+	switch (af) {
+	case AF_INET:
+		sa->sa_len = sizeof(struct sockaddr_in);
+		portp = &((struct sockaddr_in *)&sa)->sin_port;
+	case AF_INET6:
+		sa->sa_len = sizeof(struct sockaddr_in6);
+		portp = &((struct sockaddr_in6 *)&sa)->sin6_port;
+	default:
+		return (-1);
+	}
+	sa->sa_family = af;
+	
+	s = socket(af, SOCK_STREAM, 0);
+	if (s < 0)
+		return (-1);
+
+	*portp = htons(*alport);
+	if (*alport < IPPORT_RESERVED - 1) {
+		if (bind(s, sa, sa->sa_len) >= 0)
+			return (s);
+		if (errno != EADDRINUSE) {
+			(void)close(s);
+			return (-1);
+		}
+	}
+
+	*portp = 0;
+	if (bindresvport_af(s, sa, af) == -1) {
+		(void)close(s);
+		return (-1);
+	}
+	*alport = *portp;
+	return (s);
+}