ioctl을 이용한 정보수집

ioctl은

#include <sys/ioctl.h> int ioctl(int d, int request, ...);

이런 모양인데, int d는 descriptor로 socket을 통해 받아와야 한다.
그리고 request는 /usr/include/bits/ioctls.h 파일에 정의된 내용을 사용하면 된다.

/* Copyright (C) 1996, 1997, 1998, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _SYS_IOCTL_H
# error "Never use  directly; include  instead."
#endif

/* Use the definitions from the kernel header files.  */
#include "asm/ioctls.h"

/* Routing table calls.  */
#define SIOCADDRT       0x890B          /* add routing table entry      */
#define SIOCDELRT       0x890C          /* delete routing table entry   */
#define SIOCRTMSG       0x890D          /* call to routing system       */

/* Socket configuration controls. */
#define SIOCGIFNAME     0x8910          /* get iface name               */
#define SIOCSIFLINK     0x8911          /* set iface channel            */
#define SIOCGIFCONF     0x8912          /* get iface list               */
#define SIOCGIFFLAGS    0x8913          /* get flags                    */
#define SIOCSIFFLAGS    0x8914          /* set flags                    */
#define SIOCGIFADDR     0x8915          /* get PA address               */
#define SIOCSIFADDR     0x8916          /* set PA address               */
#define SIOCGIFDSTADDR  0x8917          /* get remote PA address        */
#define SIOCSIFDSTADDR  0x8918          /* set remote PA address        */
#define SIOCGIFBRDADDR  0x8919          /* get broadcast PA address     */
#define SIOCSIFBRDADDR  0x891a          /* set broadcast PA address     */
#define SIOCGIFNETMASK  0x891b          /* get network PA mask          */
#define SIOCSIFNETMASK  0x891c          /* set network PA mask          */
#define SIOCGIFMETRIC   0x891d          /* get metric                   */
#define SIOCSIFMETRIC   0x891e          /* set metric                   */
#define SIOCGIFMEM      0x891f          /* get memory address (BSD)     */
#define SIOCSIFMEM      0x8920          /* set memory address (BSD)     */
#define SIOCGIFMTU      0x8921          /* get MTU size                 */
#define SIOCSIFMTU      0x8922          /* set MTU size                 */
#define SIOCSIFNAME     0x8923          /* set interface name           */
#define SIOCSIFHWADDR   0x8924          /* set hardware address         */
#define SIOCGIFENCAP    0x8925          /* get/set encapsulations       */
#define SIOCSIFENCAP    0x8926
#define SIOCGIFHWADDR   0x8927          /* Get hardware address         */
#define SIOCGIFSLAVE    0x8929          /* Driver slaving support       */
#define SIOCSIFSLAVE    0x8930
#define SIOCADDMULTI    0x8931          /* Multicast address lists      */
#define SIOCDELMULTI    0x8932
#define SIOCGIFINDEX    0x8933          /* name -> if_index mapping     */
#define SIOGIFINDEX     SIOCGIFINDEX    /* misprint compatibility :-)   */
#define SIOCSIFPFLAGS   0x8934          /* set/get extended flags set   */
#define SIOCGIFPFLAGS   0x8935
#define SIOCDIFADDR     0x8936          /* delete PA address            */
#define SIOCSIFHWBROADCAST      0x8937  /* set hardware broadcast addr  */
#define SIOCGIFCOUNT    0x8938          /* get number of devices */

#define SIOCGIFBR       0x8940          /* Bridging support             */
#define SIOCSIFBR       0x8941          /* Set bridging options         */

#define SIOCGIFTXQLEN   0x8942          /* Get the tx queue length      */
#define SIOCSIFTXQLEN   0x8943          /* Set the tx queue length      */


/* ARP cache control calls. */
                    /*  0x8950 - 0x8952  * obsolete calls, don't re-use */
#define SIOCDARP        0x8953          /* delete ARP table entry       */
#define SIOCGARP        0x8954          /* get ARP table entry          */
#define SIOCSARP        0x8955          /* set ARP table entry          */

/* RARP cache control calls. */
#define SIOCDRARP       0x8960          /* delete RARP table entry      */
#define SIOCGRARP       0x8961          /* get RARP table entry         */
#define SIOCSRARP       0x8962          /* set RARP table entry         */

/* Driver configuration calls */

#define SIOCGIFMAP      0x8970          /* Get device parameters        */
#define SIOCSIFMAP      0x8971          /* Set device parameters        */

/* DLCI configuration calls */

#define SIOCADDDLCI     0x8980          /* Create new DLCI device       */
#define SIOCDELDLCI     0x8981          /* Delete DLCI device           */

/* Device private ioctl calls.  */

/* These 16 ioctls are available to devices via the do_ioctl() device
   vector.  Each device should include this file and redefine these
   names as their own. Because these are device dependent it is a good
   idea _NOT_ to issue them to random objects and hope.  */

#define SIOCDEVPRIVATE          0x89F0  /* to 89FF */

/*
 *      These 16 ioctl calls are protocol private
 */

#define SIOCPROTOPRIVATE 0x89E0 /* to 89EF */

잠시 socket을 소개하자면

#include <sys/socket.h> int socket(int domain, int type, int protocol); domain     Name                Purpose                          Man page     PF_UNIX, PF_LOCAL   Local communication              unix(7)     PF_INET             IPv4 Internet protocols          ip(7)     PF_INET6            IPv6 Internet protocols     PF_IPX              IPX - Novell protocols     PF_NETLINK          Kernel user interface device     netlink(7)     PF_X25              ITU-T X.25 / ISO-8208 protocol   x25(7)     PF_AX25             Amateur radio AX.25 protocol     PF_ATMPVC           Access to raw ATM PVCs     PF_APPLETALK        Appletalk                        ddp(7)     PF_PACKET           Low level packet interface       packet(7) type    SOCK_STREAM           Provides sequenced, reliable, two-way, connection-based byte streams.  An  out-of-band  data  transmission           mechanism may be supported.    SOCK_DGRAM           Supports datagrams (connectionless, unreliable messages of a fixed maximum length).    SOCK_SEQPACKET(is not implemented for AF_INET)           Provides  a  sequenced,  reliable,  two-way connection-based data transmission path for datagrams of fixed           maximum length; a consumer is required to read an entire packet with each read system call.    SOCK_RAW           Provides raw network protocol access.    SOCK_RDM           Provides a reliable datagram layer that does not guarantee ordering.    SOCK_PACKET           Obsolete and should not be used in new programs; see packet(7). protocol     Normally only a single protocol exists to support a particular socket type within a given protocol family, in which case protocol can be specified as 0.

값들을 필요로 한다.

[링크 : http://www.joinc.co.kr/modules/moniwiki/wiki.php/article/network_information#s-2.2]