ec21434933
this library. Sticking to 'libifconfig' (and 'ifconfig_' as function prefix) should reduce chances of namespace collisions, make it more clear what the library does, and be more in line with existing libraries. Submitted by: Marie Helene Kvello-Aune <marieheleneka@gmail.com> Differential Revision: https://reviews.freebsd.org/D7742 Reviewed by: cem, kp
95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/*
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* Copyright (c) 2016, Marie Helene Kvello-Aune
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* thislist of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <err.h>
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#include <errno.h>
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#include <net/if.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libifconfig.h>
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int main(int argc, char *argv[])
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{
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if (argc != 3) {
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errx(EINVAL, "Invalid number of arguments."
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" First argument should be interface name, second argument"
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" should be the MTU to set.");
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}
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char *ifname, *ptr;
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int mtu;
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/* We have a static number of arguments. Therefore we can do it simple. */
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ifname = strdup(argv[1]);
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mtu = (int)strtol(argv[2], &ptr, 10);
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printf("Interface name: %s\n", ifname);
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printf("New MTU: %d", mtu);
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ifconfig_handle_t *lifh = ifconfig_open();
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if (ifconfig_set_mtu(lifh, ifname, mtu) == 0) {
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printf("Successfully changed MTU of %s to %d\n", ifname, mtu);
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ifconfig_close(lifh);
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lifh = NULL;
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free(ifname);
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return (0);
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} else {
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switch (ifconfig_err_errtype(lifh)) {
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case SOCKET:
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warnx("couldn't create socket. This shouldn't happen.\n");
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break;
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case IOCTL:
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if (ifconfig_err_ioctlreq(lifh) == SIOCSIFMTU) {
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warnx("Failed to set MTU (SIOCSIFMTU)\n");
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} else {
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warnx(
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"Failed to set MTU due to error in unexpected ioctl() call %lu. Error code: %i.\n",
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ifconfig_err_ioctlreq(lifh),
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ifconfig_err_errno(lifh));
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}
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break;
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default:
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warnx(
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"Should basically never end up here in this example.\n");
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break;
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}
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ifconfig_close(lifh);
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lifh = NULL;
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free(ifname);
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return (-1);
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}
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}
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