Differential D7529 Diff 19347 lib/libifconfig/examples/setmtu.c

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lib/libifconfig/examples/setmtu.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.
				*/

				#include <err.h>
				#include <errno.h>
				#include <net/if.h>
				#include <sys/ioctl.h>
				#include <stdio.h>
				#include <stdlib.h>
				#include <string.h>
				#include <libifconfig.h>


				int main(int argc, char *argv[])
				{
				if (argc != 3) {
				errx(EINVAL, "Invalid number of arguments."
				" First argument should be interface name, second argument"
				" should be the MTU to set.");
				}

				char ifname, ptr;
				int mtu;

				/* We have a static number of arguments. Therefore we can do it simple. */
				bcrUnsubmitted Done Inline Actions Superfluous space after "do". bcr: Superfluous space after "do".
				ifname = strdup(argv[1]);
				mtu = (int)strtol(argv[2], &ptr, 10);

				printf("Interface name: %s\n", ifname);
				printf("New MTU: %d", mtu);

				libifc_handle_t *lifh = libifc_open();
				if (libifc_set_mtu(lifh, ifname, mtu) == 0) {
				printf("Successfully changed MTU of %s to %d\n", ifname, mtu);
				libifc_close(lifh);
				lifh = NULL;
				free(ifname);
				return (0);
				} else {
				switch (libifc_err_errtype(lifh)) {
				case SOCKET:
				warnx("couldn't create socket. This shouldn't happen.\n");
				break;
				case IOCTL:
				if (libifc_err_ioctlreq(lifh) == SIOCSIFMTU) {
				warnx("Failed to set MTU (SIOCSIFMTU)\n");
				} else {
				warnx(
				"Failed to set MTU due to error in unexpected ioctl() call %lu. Error code: %i.\n",
				libifc_err_ioctlreq(lifh),
				libifc_err_errno(lifh));
				}
				break;
				default:
				warnx(
				"Should basically never end up here in this example.\n");
				break;
				}

				libifc_close(lifh);
				lifh = NULL;
				free(ifname);
				return (-1);
				}
				}