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4fb0b51703
by ifconfig that someone had submitted. It fixes 1 bug, gets rid of the excessive bloating of a structure that is used in a static const array, and removes the implicit struct copys by keeping only the int type needed. It also turns this into a configurable feature (off by default).
493 lines
13 KiB
C
493 lines
13 KiB
C
/* ifconfig
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*
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* Similar to the standard Unix ifconfig, but with only the necessary
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* parts for AF_INET, and without any printing of if info (for now).
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*
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* Bjorn Wesen, Axis Communications AB
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*
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*
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* Authors of the original ifconfig was:
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* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* $Id: ifconfig.c,v 1.12 2001/08/10 06:02:23 mjn3 Exp $
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*
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*/
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/*
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* Heavily modified by Manuel Novoa III Mar 6, 2001
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*
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* From initial port to busybox, removed most of the redundancy by
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* converting to a table-driven approach. Added several (optional)
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* args missing from initial port.
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*
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* Still missing: media, tunnel.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h> // strcmp and friends
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#include <ctype.h> // isdigit and friends
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#include <stddef.h> /* offsetof */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <linux/if_ether.h>
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#include "busybox.h"
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#ifdef BB_FEATURE_IFCONFIG_SLIP
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#include <linux/if_slip.h>
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#endif
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/* I don't know if this is needed for busybox or not. Anyone? */
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#define QUESTIONABLE_ALIAS_CASE
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/* Defines for glibc2.0 users. */
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#ifndef SIOCSIFTXQLEN
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#define SIOCSIFTXQLEN 0x8943
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#define SIOCGIFTXQLEN 0x8942
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#endif
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/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
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#ifndef ifr_qlen
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#define ifr_qlen ifr_ifru.ifru_mtu
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#endif
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#ifndef IFF_DYNAMIC
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#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
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#endif
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/*
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* Here are the bit masks for the "flags" member of struct options below.
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* N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
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* CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
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*/
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#define N_CLR 0x01
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#define M_CLR 0x02
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#define N_SET 0x04
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#define M_SET 0x08
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#define N_ARG 0x10
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#define M_ARG 0x20
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#define M_MASK (M_CLR | M_SET | M_ARG)
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#define N_MASK (N_CLR | N_SET | N_ARG)
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#define SET_MASK (N_SET | M_SET)
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#define CLR_MASK (N_CLR | M_CLR)
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#define SET_CLR_MASK (SET_MASK | CLR_MASK)
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#define ARG_MASK (M_ARG | N_ARG)
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/*
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* Here are the bit masks for the "arg_flags" member of struct options below.
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*/
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/*
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* cast type:
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* 00 int
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* 01 char *
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* 02 HOST_COPY in_ether
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* 03 HOST_COPY INET_resolve
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*/
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#define A_CAST_TYPE 0x03
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/*
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* map type:
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* 00 not a map type (mem_start, io_addr, irq)
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* 04 memstart (unsigned long)
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* 08 io_addr (unsigned short)
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* 0C irq (unsigned char)
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*/
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#define A_MAP_TYPE 0x0C
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#define A_ARG_REQ 0x10 /* Set if an arg is required. */
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#define A_NETMASK 0x20 /* Set if netmask (check for multiple sets). */
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#define A_SET_AFTER 0x40 /* Set a flag at the end. */
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#define A_COLON_CHK 0x80 /* Is this needed? See below. */
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/*
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* These defines are for dealing with the A_CAST_TYPE field.
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*/
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#define A_CAST_CHAR_PTR 0x01
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#define A_CAST_RESOLVE 0x01
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#define A_CAST_HOST_COPY 0x02
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#define A_CAST_HOST_COPY_IN_ETHER A_CAST_HOST_COPY
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#define A_CAST_HOST_COPY_RESOLVE (A_CAST_HOST_COPY | A_CAST_RESOLVE)
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/*
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* These defines are for dealing with the A_MAP_TYPE field.
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*/
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#define A_MAP_ULONG 0x04 /* memstart */
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#define A_MAP_USHORT 0x08 /* io_addr */
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#define A_MAP_UCHAR 0x0C /* irq */
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/*
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* Define the bit masks signifying which operations to perform for each arg.
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*/
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#define ARG_METRIC (A_ARG_REQ /*| A_CAST_INT*/)
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#define ARG_MTU (A_ARG_REQ /*| A_CAST_INT*/)
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#define ARG_TXQUEUELEN (A_ARG_REQ /*| A_CAST_INT*/)
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#define ARG_MEM_START (A_ARG_REQ | A_MAP_ULONG)
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#define ARG_IO_ADDR (A_ARG_REQ | A_MAP_USHORT)
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#define ARG_IRQ (A_ARG_REQ | A_MAP_UCHAR)
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#define ARG_DSTADDR (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
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#define ARG_NETMASK (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
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#define ARG_BROADCAST (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
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#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
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#define ARG_POINTOPOINT (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
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#define ARG_KEEPALIVE (A_ARG_REQ | A_CAST_CHAR_PTR)
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#define ARG_OUTFILL (A_ARG_REQ | A_CAST_CHAR_PTR)
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#define ARG_HOSTNAME (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK)
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/*
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* Set up the tables. Warning! They must have corresponding order!
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*/
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struct arg1opt {
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const char *name;
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unsigned short selector;
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unsigned short ifr_offset;
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};
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struct options {
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const char *name;
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const unsigned char flags;
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const unsigned char arg_flags;
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const unsigned short selector;
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};
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#define ifreq_offsetof(x) offsetof(struct ifreq, x)
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static const struct arg1opt Arg1Opt[] = {
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{"SIOCSIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric)},
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{"SIOCSIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu)},
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{"SIOCSIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen)},
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{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
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{"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
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{"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
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#ifdef BB_FEATURE_IFCONFIG_HW
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{"SIOCSIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr)},
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#endif
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{"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
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#ifdef SIOCSKEEPALIVE
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{"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
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#endif
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#ifdef SIOCSOUTFILL
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{"SIOCSOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data)},
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#endif
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#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
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{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start)},
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{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr)},
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{"SIOCSIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.irq)},
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#endif
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/* Last entry if for unmatched (possibly hostname) arg. */
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{"SIOCSIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr)},
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};
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static const struct options OptArray[] = {
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{"metric", N_ARG, ARG_METRIC, 0},
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{"mtu", N_ARG, ARG_MTU, 0},
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{"txqueuelen", N_ARG, ARG_TXQUEUELEN, 0},
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{"dstaddr", N_ARG, ARG_DSTADDR, 0},
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{"netmask", N_ARG, ARG_NETMASK, 0},
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{"broadcast", N_ARG | M_CLR, ARG_BROADCAST, IFF_BROADCAST},
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#ifdef BB_FEATURE_IFCONFIG_HW
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{"hw", N_ARG, ARG_HW, 0},
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#endif
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{"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
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#ifdef SIOCSKEEPALIVE
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{"keepalive", N_ARG, ARG_KEEPALIVE, 0},
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#endif
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#ifdef SIOCSOUTFILL
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{"outfill", N_ARG, ARG_OUTFILL, 0},
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#endif
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#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
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{"mem_start", N_ARG, ARG_MEM_START, 0},
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{"io_addr", N_ARG, ARG_IO_ADDR, 0},
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{"irq", N_ARG, ARG_IRQ, 0},
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#endif
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{"arp", N_CLR | M_SET, 0, IFF_NOARP},
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{"trailers", N_CLR | M_SET, 0, IFF_NOTRAILERS},
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{"promisc", N_SET | M_CLR, 0, IFF_PROMISC},
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{"multicast", N_SET | M_CLR, 0, IFF_MULTICAST},
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{"allmulti", N_SET | M_CLR, 0, IFF_ALLMULTI},
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{"dynamic", N_SET | M_CLR, 0, IFF_DYNAMIC},
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{"up", N_SET , 0, (IFF_UP | IFF_RUNNING)},
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{"down", N_CLR , 0, IFF_UP},
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{ NULL, 0, ARG_HOSTNAME, (IFF_UP | IFF_RUNNING)}
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};
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/*
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* A couple of prototypes.
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*/
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#ifdef BB_FEATURE_IFCONFIG_HW
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static int in_ether(char *bufp, struct sockaddr *sap);
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#endif
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#ifdef BB_FEATURE_IFCONFIG_STATUS
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extern int interface_opt_a;
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extern int display_interfaces(char *ifname);
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#endif
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/*
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* Our main function.
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*/
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int ifconfig_main(int argc, char **argv)
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{
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struct ifreq ifr;
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struct sockaddr_in sai;
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#ifdef BB_FEATURE_IFCONFIG_HW
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struct sockaddr sa;
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#endif
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const struct arg1opt *a1op;
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const struct options *op;
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int sockfd; /* socket fd we use to manipulate stuff with */
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int goterr;
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int selector;
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char *p;
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char host[128];
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unsigned char mask;
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unsigned char did_flags;
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goterr = 0;
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did_flags = 0;
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/* skip argv[0] */
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++argv;
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--argc;
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#ifdef BB_FEATURE_IFCONFIG_STATUS
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if ((argc > 0) && (strcmp(*argv,"-a") == 0)) {
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interface_opt_a = 1;
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--argc;
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++argv;
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}
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#endif
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if(argc <= 1) {
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#ifdef BB_FEATURE_IFCONFIG_STATUS
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return display_interfaces(argc ? *argv : NULL);
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#else
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error_msg_and_die( "ifconfig was not compiled with interface status display support.");
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#endif
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}
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/* Create a channel to the NET kernel. */
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror_msg_and_die("socket");
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}
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/* get interface name */
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safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
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/* Process the remaining arguments. */
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while (*++argv != (char *) NULL) {
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p = *argv;
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mask = N_MASK;
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if (*p == '-') { /* If the arg starts with '-'... */
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++p; /* advance past it and */
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mask = M_MASK; /* set the appropriate mask. */
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}
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for (op = OptArray ; op->name ; op++) { /* Find table entry. */
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if (strcmp(p,op->name) == 0) { /* If name matches... */
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if ((mask &= op->flags)) { /* set the mask and go. */
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goto FOUND_ARG;;
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}
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/* If we get here, there was a valid arg with an */
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/* invalid '-' prefix. */
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++goterr;
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goto LOOP;
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}
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}
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/* We fell through, so treat as possible hostname. */
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a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
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mask = op->arg_flags;
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goto HOSTNAME;
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FOUND_ARG:
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if (mask & ARG_MASK) {
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mask = op->arg_flags;
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a1op = Arg1Opt + (op - OptArray);
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if (mask & A_NETMASK & did_flags) {
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show_usage();
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}
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if (*++argv == NULL) {
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if (mask & A_ARG_REQ) {
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show_usage();
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} else {
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--argv;
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mask &= A_SET_AFTER; /* just for broadcast */
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}
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} else { /* got an arg so process it */
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HOSTNAME:
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did_flags |= (mask & A_NETMASK);
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if (mask & A_CAST_HOST_COPY) {
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#ifdef BB_FEATURE_IFCONFIG_HW
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if (mask & A_CAST_RESOLVE) {
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#endif
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safe_strncpy(host, *argv, (sizeof host));
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sai.sin_family = AF_INET;
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sai.sin_port = 0;
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if (!strcmp(host, "default")) {
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/* Default is special, meaning 0.0.0.0. */
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sai.sin_addr.s_addr = INADDR_ANY;
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} else if (inet_aton(host, &sai.sin_addr) == 0) {
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/* It's not a dotted quad. */
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++goterr;
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continue;
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}
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p = (char *) &sai;
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#ifdef BB_FEATURE_IFCONFIG_HW
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} else { /* A_CAST_HOST_COPY_IN_ETHER */
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/* This is the "hw" arg case. */
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if (strcmp("ether", *argv) || (*++argv == NULL)) {
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show_usage();
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}
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safe_strncpy(host, *argv, (sizeof host));
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if (in_ether(host, &sa)) {
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fprintf(stderr, "invalid hw-addr %s\n", host);
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++goterr;
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continue;
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}
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p = (char *) &sa;
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}
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#endif
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memcpy((((char *)(&ifr)) + a1op->ifr_offset),
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p, sizeof(struct sockaddr));
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} else {
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unsigned int i = strtoul(*argv,NULL,0);
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p = ((char *)(&ifr)) + a1op->ifr_offset;
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#ifdef BB_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
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if (mask & A_MAP_TYPE) {
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if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
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++goterr;
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continue;
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}
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if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
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*((unsigned char *) p) = i;
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} else if (mask & A_MAP_USHORT) {
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*((unsigned short *) p) = i;
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} else {
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*((unsigned long *) p) = i;
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}
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} else
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#endif
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if (mask & A_CAST_CHAR_PTR) {
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*((caddr_t *) p) = (caddr_t) i;
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} else { /* A_CAST_INT */
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*((int *) p) = i;
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}
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}
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if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
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perror(a1op->name);
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++goterr;
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continue;
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}
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#ifdef QUESTIONABLE_ALIAS_CASE
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if (mask & A_COLON_CHK) {
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/*
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* Don't do the set_flag() if the address is an alias with
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* a - at the end, since it's deleted already! - Roman
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*
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* Should really use regex.h here, not sure though how well
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* it'll go with the cross-platform support etc.
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*/
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char *ptr;
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short int found_colon = 0;
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for (ptr = ifr.ifr_name; *ptr; ptr++ ) {
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if (*ptr == ':') {
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found_colon++;
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}
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}
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if (found_colon && *(ptr - 1) == '-') {
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continue;
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}
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}
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#endif
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}
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if (!(mask & A_SET_AFTER)) {
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continue;
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}
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mask = N_SET;
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}
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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perror("SIOCGIFFLAGS");
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++goterr;
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} else {
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selector = op->selector;
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if (mask & SET_MASK) {
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ifr.ifr_flags |= selector;
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} else {
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ifr.ifr_flags &= ~selector;
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}
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if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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perror("SIOCSIFFLAGS");
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++goterr;
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}
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}
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LOOP:
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} /* end of while-loop */
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return goterr;
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}
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#ifdef BB_FEATURE_IFCONFIG_HW
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/* Input an Ethernet address and convert to binary. */
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static int
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in_ether(char *bufp, struct sockaddr *sap)
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{
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unsigned char *ptr;
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int i, j;
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unsigned char val;
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unsigned char c;
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sap->sa_family = ARPHRD_ETHER;
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ptr = sap->sa_data;
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for (i = 0 ; i < ETH_ALEN ; i++) {
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val = 0;
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/* We might get a semicolon here - not required. */
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if (i && (*bufp == ':')) {
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bufp++;
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}
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for (j=0 ; j<2 ; j++) {
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c = *bufp;
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if (c >= '0' && c <= '9') {
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c -= '0';
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} else if (c >= 'a' && c <= 'f') {
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c -= ('a' - 10);
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|
} else if (c >= 'A' && c <= 'F') {
|
|
c -= ('A' - 10);
|
|
} else if (j && (c == ':' || c == 0)) {
|
|
break;
|
|
} else {
|
|
return -1;
|
|
}
|
|
++bufp;
|
|
val <<= 4;
|
|
val += c;
|
|
}
|
|
*ptr++ = val;
|
|
}
|
|
|
|
return (int) (*bufp); /* Error if we don't end at end of string. */
|
|
}
|
|
#endif
|