d4af9e693f
I have worked hard to reduce diffs against the vendor branch. One notable change in that respect is that we no longer prefer DSA over RSA - the reasons for doing so went away years ago. This may cause some surprises, as ssh will warn about unknown host keys even for hosts whose keys haven't changed. MFC after: 6 weeks
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
/* This file has be substantially modified from the original OpenBSD source */
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/* $OpenBSD: bindresvport.c,v 1.17 2005/12/21 01:40:22 millert Exp $ */
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/*
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* Copyright 1996, Jason Downs. All rights reserved.
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* Copyright 1998, Theo de Raadt. All rights reserved.
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* Copyright 2000, Damien Miller. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* OPENBSD ORIGINAL: lib/libc/rpc/bindresvport.c */
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#include "includes.h"
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#ifndef HAVE_BINDRESVPORT_SA
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <string.h>
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#define STARTPORT 600
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#define ENDPORT (IPPORT_RESERVED - 1)
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#define NPORTS (ENDPORT - STARTPORT + 1)
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/*
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* Bind a socket to a privileged IP port
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*/
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int
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bindresvport_sa(int sd, struct sockaddr *sa)
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{
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int error, af;
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struct sockaddr_storage myaddr;
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struct sockaddr_in *in;
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struct sockaddr_in6 *in6;
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u_int16_t *portp;
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u_int16_t port;
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socklen_t salen;
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int i;
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if (sa == NULL) {
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memset(&myaddr, 0, sizeof(myaddr));
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sa = (struct sockaddr *)&myaddr;
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if (getsockname(sd, sa, &salen) == -1)
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return -1; /* errno is correctly set */
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af = sa->sa_family;
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memset(&myaddr, 0, salen);
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} else
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af = sa->sa_family;
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if (af == AF_INET) {
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in = (struct sockaddr_in *)sa;
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salen = sizeof(struct sockaddr_in);
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portp = &in->sin_port;
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} else if (af == AF_INET6) {
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in6 = (struct sockaddr_in6 *)sa;
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salen = sizeof(struct sockaddr_in6);
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portp = &in6->sin6_port;
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} else {
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errno = EPFNOSUPPORT;
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return (-1);
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}
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sa->sa_family = af;
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port = ntohs(*portp);
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if (port == 0)
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port = (arc4random() % NPORTS) + STARTPORT;
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/* Avoid warning */
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error = -1;
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for(i = 0; i < NPORTS; i++) {
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*portp = htons(port);
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error = bind(sd, sa, salen);
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/* Terminate on success */
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if (error == 0)
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break;
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/* Terminate on errors, except "address already in use" */
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if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL)))
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break;
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port++;
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if (port > ENDPORT)
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port = STARTPORT;
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}
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return (error);
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}
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#endif /* HAVE_BINDRESVPORT_SA */
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