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/*
* Copyright (c) 2012, Intel Corporation
*
* 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 Intel Corporation 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
* OWNER 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 <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <murphy/common/macros.h>
static int reject_fd = -1;
static inline int reserve_reject_fd(void)
{
if (reject_fd < 0)
reject_fd = open("/dev/null", O_RDONLY);
return reject_fd;
}
static void MRP_INIT reserve_reject(void)
{
reserve_reject_fd();
}
int mrp_reject_connection(int sock, struct sockaddr *addr, socklen_t *alen)
{
struct sockaddr *a, buf;
socklen_t *l, len;
int fd;
if (addr != NULL) {
a = addr;
l = alen;
}
else {
len = sizeof(buf);
a = &buf;
l = &len;
}
fd = accept(sock, a, l);
if (fd >= 0) {
close(fd);
return 0;
}
if (errno != EMFILE)
return -1;
if (reject_fd < 0) {
errno = ENOENT;
return -1;
}
close(reject_fd);
reject_fd = -1;
fd = accept(sock, a, l);
if (fd >= 0)
close(fd);
reserve_reject_fd();
return (fd >= 0 ? 0 : -1);
}
MRP_EXIT static void mrp_close_reserved_fd()
{
if (reject_fd > 0)
close(reject_fd);
}
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