source: rtems/cpukit/librpc/src/rpc/bindresvport.c @ e5c8049

/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 *
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 *
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 *
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 *
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 *
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)bindresvport.c 1.8 88/02/08 SMI";*/
/*static char *sccsid = "from: @(#)bindresvport.c       2.2 88/07/29 4.0 RPCSRC";*/
/*from: OpenBSD: bindresvport.c,v 1.7 1996/07/30 16:25:47 downsj Exp */
static char *rcsid = "$FreeBSD: src/lib/libc/rpc/bindresvport.c,v 1.12 2000/01/26 09:02:42 shin Exp $";
#endif

/*
 * Copyright (c) 1987 by Sun Microsystems, Inc.
 *
 * Portions Copyright(C) 1996, Jason Downs.  All rights reserved.
 */

#include <sys/types.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <string.h>

/*
 * Bind a socket to a privileged port for whatever protocol.
 */
int
bindresvport_sa(sd, sa)
        int sd;
        struct sockaddr *sa;
{
        int old, error, af;
        struct sockaddr myaddr;
        struct sockaddr_in *sin;
#if (defined(AF_INET6) && defined(IPPROTO_IPV6))
        struct sockaddr_in6 *sin6;
#endif
        int proto, portrange, portlow;
        u_int16_t port;
        int salen;

        if (sa == NULL) {
                salen = sizeof(myaddr);
                sa = (struct sockaddr *)&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) {
                proto = IPPROTO_IP;
                portrange = IP_PORTRANGE;
                portlow = IP_PORTRANGE_LOW;
                sin = (struct sockaddr_in *)sa;
                salen = sizeof(struct sockaddr_in);
                port = sin->sin_port;
#if (defined(AF_INET6) && defined(IPPROTO_IPV6))
        } else if (af == AF_INET6) {
                proto = IPPROTO_IPV6;
                portrange = IPV6_PORTRANGE;
                portlow = IPV6_PORTRANGE_LOW;
                sin6 = (struct sockaddr_in6 *)sa;
                salen = sizeof(struct sockaddr_in6);
                port = sin6->sin6_port;
#endif
        } else {
                errno = EPFNOSUPPORT;
                return (-1);
        }
        sa->sa_family = af;
        sa->sa_len = salen;

        if (port == 0) {
                int oldlen = sizeof(old);

                error = getsockopt(sd, proto, portrange, &old, &oldlen);
                if (error < 0)
                        return (error);

                error = setsockopt(sd, proto, portrange, &portlow,
                    sizeof(portlow));
                if (error < 0)
                        return (error);
        }

        error = bind(sd, sa, salen);

        if (port == 0) {
                int saved_errno = errno;

                if (error) {
                        if (setsockopt(sd, proto, portrange, &old,
                            sizeof(old)) < 0)
                                errno = saved_errno;
                        return (error);
                }

                if (sa != (struct sockaddr *)&myaddr) {
                        /* Hmm, what did the kernel assign... */
                        if (getsockname(sd, sa, &salen) < 0)
                                errno = saved_errno;
                        return (error);
                }
        }
        return (error);
}

/*
 * Bind a socket to a privileged IP port
 */
int
bindresvport(sd, sin)
        int sd;
        struct sockaddr_in *sin;
{
        return bindresvport_sa(sd, (struct sockaddr *)sin);
}