1 /* 2 * Copyright (c) 2017, Marie Helene Kvello-Aune 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * thislist of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation and/or 13 * other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 17 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <err.h> 28 #include <errno.h> 29 #include <net/if.h> 30 #include <sys/ioctl.h> 31 #include <limits.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <libifconfig.h> 36 37 #include <net/if_vlan_var.h> 38 39 int 40 main(int argc, char *argv[]) 41 { 42 char *ifname, *parentif; 43 unsigned short vlantag; 44 const char *errstr; 45 ifconfig_handle_t *lifh; 46 47 if (argc != 4) { 48 errx(EINVAL, "Invalid number of arguments." 49 " Should provide exactly three arguments: " 50 "INTERFACE, PARENT_INTERFACE and VLAN_TAG."); 51 } 52 53 /* We have a static number of arguments. Therefore we can do it simple. */ 54 ifname = strdup(argv[1]); 55 parentif = strdup(argv[2]); 56 vlantag = strtonum(argv[3], 0, USHRT_MAX, &errstr); 57 58 if (errstr != NULL) { 59 errx(1, "VLAN_TAG must be between 0 and %i.\n", USHRT_MAX); 60 } 61 62 printf("Interface: %s\nNew VLAN tag: %i\n", ifname, vlantag); 63 64 lifh = ifconfig_open(); 65 if (lifh == NULL) { 66 errx(ENOMEM, "Failed to open libifconfig handle."); 67 return (-1); 68 } 69 70 if (ifconfig_set_vlantag(lifh, ifname, parentif, vlantag) == 0) { 71 printf("Successfully changed vlan tag.\n"); 72 ifconfig_close(lifh); 73 lifh = NULL; 74 free(ifname); 75 free(parentif); 76 return (0); 77 } 78 79 switch (ifconfig_err_errtype(lifh)) { 80 case SOCKET: 81 warnx("couldn't create socket. This shouldn't happen.\n"); 82 break; 83 case IOCTL: 84 if (ifconfig_err_ioctlreq(lifh) == SIOCGETVLAN) { 85 warnx("Target interface isn't a VLAN interface.\n"); 86 } 87 if (ifconfig_err_ioctlreq(lifh) == SIOCSETVLAN) { 88 warnx( 89 "Couldn't change VLAN properties of interface.\n"); 90 } 91 break; 92 default: 93 warnx( 94 "This is a thorough example accommodating for temporary" 95 " 'not implemented yet' errors. That's likely what happened" 96 " now. If not, your guess is as good as mine. ;)" 97 " Error code: %d\n", ifconfig_err_errno( 98 lifh)); 99 break; 100 } 101 102 ifconfig_close(lifh); 103 lifh = NULL; 104 free(ifname); 105 free(parentif); 106 return (-1); 107 } 108