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-rw-r--r--openbsd-compat/bindresvport.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/openbsd-compat/bindresvport.c b/openbsd-compat/bindresvport.c
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+/* This file has be substantially modified from the original OpenBSD source */
+
+/* $OpenBSD: bindresvport.c,v 1.17 2005/12/21 01:40:22 millert Exp $ */
+
+/*
+ * Copyright 1996, Jason Downs. All rights reserved.
+ * Copyright 1998, Theo de Raadt. All rights reserved.
+ * Copyright 2000, Damien Miller. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/rpc/bindresvport.c */
+
+#include "includes.h"
+
+#ifndef HAVE_BINDRESVPORT_SA
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <string.h>
+
+#define STARTPORT 600
+#define ENDPORT (IPPORT_RESERVED - 1)
+#define NPORTS (ENDPORT - STARTPORT + 1)
+
+/*
+ * Bind a socket to a privileged IP port
+ */
+int
+bindresvport_sa(int sd, struct sockaddr *sa)
+{
+ int error, af;
+ struct sockaddr_storage myaddr;
+ struct sockaddr_in *in;
+ struct sockaddr_in6 *in6;
+ u_int16_t *portp;
+ u_int16_t port;
+ socklen_t salen;
+ int i;
+
+ if (sa == NULL) {
+ memset(&myaddr, 0, sizeof(myaddr));
+ sa = (struct sockaddr *)&myaddr;
+ salen = sizeof(myaddr);
+
+ if (getsockname(sd, sa, &salen) == -1)
+ return -1; /* errno is correctly set */
+
+ af = sa->sa_family;
+ memset(&myaddr, 0, salen);
+ } else
+ af = sa->sa_family;
+
+ if (af == AF_INET) {
+ in = (struct sockaddr_in *)sa;
+ salen = sizeof(struct sockaddr_in);
+ portp = &in->sin_port;
+ } else if (af == AF_INET6) {
+ in6 = (struct sockaddr_in6 *)sa;
+ salen = sizeof(struct sockaddr_in6);
+ portp = &in6->sin6_port;
+ } else {
+ errno = EPFNOSUPPORT;
+ return (-1);
+ }
+ sa->sa_family = af;
+
+ port = ntohs(*portp);
+ if (port == 0)
+ port = arc4random_uniform(NPORTS) + STARTPORT;
+
+ /* Avoid warning */
+ error = -1;
+
+ for(i = 0; i < NPORTS; i++) {
+ *portp = htons(port);
+
+ error = bind(sd, sa, salen);
+
+ /* Terminate on success */
+ if (error == 0)
+ break;
+
+ /* Terminate on errors, except "address already in use" */
+ if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
+ break;
+
+ port++;
+ if (port > ENDPORT)
+ port = STARTPORT;
+ }
+
+ return (error);
+}
+
+#endif /* HAVE_BINDRESVPORT_SA */