Differential D7529 Diff 19687 lib/libifc/libifc_internal.c

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lib/libifc/libifc_internal.c

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				/*
				* Copyright (c) 2016, Marie Helene Kvello-Aune
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without modification,
				* are permitted provided that the following conditions are met:
				*
				* 1. Redistributions of source code must retain the above copyright notice,
				* thislist of conditions and the following disclaimer.
				*
				* 2. 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.
				*
				* 3. Neither the name of the copyright holder 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.
				*
				* $FreeBSD$
				*/


				#include <net/if.h>

				#include <errno.h>
				#include <stdio.h>
				#include <stdlib.h>
				#include <sys/ioctl.h>
				#include <unistd.h>


				#include "libifc.h" // Needed for libifc_errstate
				#include "libifc_internal.h"

				int
				libifc_ioctlwrap_ret(libifc_handle_t *h, unsigned long request, int rcode)
				{
				if (rcode != 0) {
				h->error.errtype = IOCTL;
				h->error.ioctl_request = request;
				h->error.errcode = errno;
				}
				return (rcode);
				}


				int
				libifc_ioctlwrap(libifc_handle_t *h, const int addressfamily,
				unsigned long request, struct ifreq *ifr)
				{
				int s;

				if (libifc_socket(h, addressfamily, &s) != 0) {
				return (-1);
				}

				int rcode = ioctl(s, request, ifr);
				return (libifc_ioctlwrap_ret(h, request, rcode));
				}


				/*
				* Function to get socket for the specified address family.
				* If the socket doesn't already exist, attempt to create it.
				*/
				int libifc_socket(libifc_handle_t h, const int addressfamily, int s)
				{
				if (addressfamily > AF_MAX) {
				h->error.errtype = SOCKET;
				h->error.errcode = EINVAL;
				return (-1);
				}

				if (h->sockets[addressfamily] != -1) {
				*s = h->sockets[addressfamily];
				return (0);
				}

				/* We don't have a socket of that type available. Create one. */
				h->sockets[addressfamily] = socket(addressfamily, SOCK_DGRAM, 0);
				if (h->sockets[addressfamily] == -1) {
				h->error.errtype = SOCKET;
				h->error.errcode = errno;
				return (-1);
				}

				*s = h->sockets[addressfamily];
				return (0);
				}