freebsd-dev/lib/libifconfig/libifconfig_internal.c

/*
 * Copyright (c) 2016-2017, 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.
 *
 * 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 <sys/ioctl.h>

#include <net/if.h>

#include <errno.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "libifconfig.h" // Needed for ifconfig_errstate
#include "libifconfig_internal.h"

int
ifconfig_getifaddrs(ifconfig_handle_t *h)
{
	int ret;

	if (h->ifap == NULL) {
		ret = getifaddrs(&h->ifap);
		return (ret);
	} else {
		return (0);
	}
}

int
ifconfig_ioctlwrap(ifconfig_handle_t *h, const int addressfamily,
    unsigned long request, void *data)
{
	int s;

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

	if (ioctl(s, request, data) != 0) {
		h->error.errtype = IOCTL;
		h->error.ioctl_request = request;
		h->error.errcode = errno;
		return (-1);
	}

	return (0);
}

/*
 * Function to get socket for the specified address family.
 * If the socket doesn't already exist, attempt to create it.
 */
int
ifconfig_socket(ifconfig_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);
}