11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * All rights reserved. 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions of source code must retain the above copyright 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * * Redistributions in binary form must reproduce the above copyright 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * the documentation and/or other materials provided with the 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * distribution. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <string.h> 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <unistd.h> 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <linux/sockios.h> 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <net/if.h> 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/socket.h> 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <sys/ioctl.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <errno.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Map an interface index into its name. 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Returns NULL on error. 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectchar* 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectif_indextoname(unsigned ifindex, char *ifname) 431dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project int ctl_sock; 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project struct ifreq ifr; 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project char* ret = NULL; 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project memset(&ifr, 0, sizeof(struct ifreq)); 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project ifr.ifr_ifindex = ifindex; 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((ctl_sock = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) { 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (ioctl(ctl_sock, SIOCGIFNAME, &ifr) >= 0) { 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project ret = strncpy (ifname, ifr.ifr_name, IFNAMSIZ); 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* Posix requires ENXIO */ 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (errno == ENODEV) 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project errno = ENXIO; 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project close(ctl_sock); 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return ret; 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 63