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/* lib/rpc/bindresvport.c */
/*
* Copyright (c) 2010, Oracle America, Inc.
* Copyright (c) 2014, Andreas Schneider <asn@samba.org>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDER 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.
*/
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <gssrpc/rpc.h>
#include <errno.h>
#include "socket-utils.h"
/*
* Bind a socket to a privileged IP port
*/
int
bindresvport_sa(int sd, struct sockaddr *sa)
{
int res;
static short port;
struct sockaddr_storage myaddr;
socklen_t salen;
int i;
#define STARTPORT 600
#define ENDPORT (IPPORT_RESERVED - 1)
#define NPORTS (ENDPORT - STARTPORT + 1)
if (sa == NULL) {
salen = sizeof(myaddr);
sa = ss2sa(&myaddr);
res = getsockname(sd, sa, &salen);
if (res < 0)
return (-1);
}
if (!sa_is_inet(sa)) {
errno = EPFNOSUPPORT;
return (-1);
}
if (port == 0) {
port = (getpid() % NPORTS) + STARTPORT;
}
res = -1;
errno = EADDRINUSE;
for (i = 0; i < NPORTS && res < 0 && errno == EADDRINUSE; i++) {
sa_setport(sa, htons(port++));
if (port > ENDPORT) {
port = STARTPORT;
}
res = bind(sd, sa, socklen(sa));
}
return (res);
}
int
bindresvport(int sd, struct sockaddr_in *sockin)
{
return (bindresvport_sa(sd, (struct sockaddr *)sockin));
}
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