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119 lines
3.2 KiB
119 lines
3.2 KiB
/* 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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salen = sizeof(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_uniform(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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