541 lines
16 KiB
C
541 lines
16 KiB
C
/* vi: set sw=4 ts=4: */
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/* 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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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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* 2002-04-20
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* IPV6 support added by Bart Visscher <magick@linux-fan.com>
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*/
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
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#include <netpacket/packet.h>
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#include <net/ethernet.h>
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#else
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#include <sys/types.h>
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#include <netinet/if_ether.h>
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#endif
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#include "inet_common.h"
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#include "libbb.h"
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#if ENABLE_FEATURE_IFCONFIG_SLIP
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# include <net/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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#if ENABLE_FEATURE_IPV6
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struct in6_ifreq {
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struct in6_addr ifr6_addr;
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uint32_t ifr6_prefixlen;
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int ifr6_ifindex;
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};
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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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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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#define A_HOSTNAME 0x100 /* Set if it is ip addr. */
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#define A_BROADCAST 0x200 /* Set if it is broadcast addr. */
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#else
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#define A_HOSTNAME 0
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#define A_BROADCAST 0
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#endif
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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_ULONG)
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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 | A_BROADCAST)
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#define ARG_HW (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
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#define ARG_POINTOPOINT (A_ARG_REQ | 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 | A_HOSTNAME)
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#define ARG_ADD_DEL (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
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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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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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const unsigned int flags:6;
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const unsigned int arg_flags:10;
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#else
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const unsigned char flags;
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const unsigned char arg_flags;
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#endif
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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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{ "SIFMETRIC", SIOCSIFMETRIC, ifreq_offsetof(ifr_metric) },
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{ "SIFMTU", SIOCSIFMTU, ifreq_offsetof(ifr_mtu) },
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{ "SIFTXQLEN", SIOCSIFTXQLEN, ifreq_offsetof(ifr_qlen) },
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{ "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
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{ "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
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{ "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
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#if ENABLE_FEATURE_IFCONFIG_HW
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{ "SIFHWADDR", SIOCSIFHWADDR, ifreq_offsetof(ifr_hwaddr) },
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#endif
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{ "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
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#ifdef SIOCSKEEPALIVE
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{ "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
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#endif
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#ifdef SIOCSOUTFILL
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{ "SOUTFILL", SIOCSOUTFILL, ifreq_offsetof(ifr_data) },
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#endif
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#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
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{ "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.mem_start) },
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{ "SIFMAP", SIOCSIFMAP, ifreq_offsetof(ifr_map.base_addr) },
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{ "SIFMAP", 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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#if ENABLE_FEATURE_IPV6
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{ "SIFADDR", SIOCSIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
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{ "DIFADDR", SIOCDIFADDR, ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
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#endif
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{ "SIFADDR", 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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#if ENABLE_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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#if ENABLE_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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#if ENABLE_FEATURE_IPV6
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{ "add", N_ARG, ARG_ADD_DEL, 0 },
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{ "del", N_ARG, ARG_ADD_DEL, 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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#if ENABLE_FEATURE_IFCONFIG_HW
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static int in_ether(const char *bufp, struct sockaddr *sap);
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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) MAIN_EXTERNALLY_VISIBLE;
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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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#if ENABLE_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 selector;
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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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unsigned int mask;
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unsigned int did_flags;
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unsigned int sai_hostname, sai_netmask;
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#else
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unsigned char mask;
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unsigned char did_flags;
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#endif
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char *p;
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/*char host[128];*/
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const char *host = NULL; /* make gcc happy */
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did_flags = 0;
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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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sai_hostname = 0;
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sai_netmask = 0;
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#endif
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/* skip argv[0] */
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++argv;
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--argc;
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#if ENABLE_FEATURE_IFCONFIG_STATUS
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if (argc > 0 && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
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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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#if ENABLE_FEATURE_IFCONFIG_STATUS
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return display_interfaces(argc ? *argv : NULL);
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#else
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bb_error_msg_and_die("no support for status display");
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#endif
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}
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/* Create a channel to the NET kernel. */
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sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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/* get interface name */
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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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mask &= op->flags;
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if (mask) /* set the mask and go. */
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goto FOUND_ARG;
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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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bb_error_msg_and_die("bad: '%s'", p-1);
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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 + ARRAY_SIZE(Arg1Opt) - 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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bb_show_usage();
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if (*++argv == NULL) {
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if (mask & A_ARG_REQ)
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bb_show_usage();
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--argv;
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mask &= A_SET_AFTER; /* just for broadcast */
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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|A_HOSTNAME));
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if (mask & A_CAST_HOST_COPY) {
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#if ENABLE_FEATURE_IFCONFIG_HW
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if (mask & A_CAST_RESOLVE) {
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#endif
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#if ENABLE_FEATURE_IPV6
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char *prefix;
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int prefix_len = 0;
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#endif
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/*safe_strncpy(host, *argv, (sizeof host));*/
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host = *argv;
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#if ENABLE_FEATURE_IPV6
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prefix = strchr(host, '/');
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if (prefix) {
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prefix_len = xatou_range(prefix + 1, 0, 128);
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*prefix = '\0';
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}
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#endif
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sai.sin_family = AF_INET;
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sai.sin_port = 0;
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if (!strcmp(host, bb_str_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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}
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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
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&& (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
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) {
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/* + is special, meaning broadcast is derived. */
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sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
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}
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#endif
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else {
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len_and_sockaddr *lsa;
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if (strcmp(host, "inet") == 0)
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continue; /* compat stuff */
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lsa = xhost2sockaddr(host, 0);
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#if ENABLE_FEATURE_IPV6
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if (lsa->u.sa.sa_family == AF_INET6) {
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int sockfd6;
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struct in6_ifreq ifr6;
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memcpy((char *) &ifr6.ifr6_addr,
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(char *) &(lsa->u.sin6.sin6_addr),
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sizeof(struct in6_addr));
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/* Create a channel to the NET kernel. */
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sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
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xioctl(sockfd6, SIOGIFINDEX, &ifr);
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ifr6.ifr6_ifindex = ifr.ifr_ifindex;
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ifr6.ifr6_prefixlen = prefix_len;
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ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(lsa);
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continue;
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}
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#endif
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sai.sin_addr = lsa->u.sin.sin_addr;
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if (ENABLE_FEATURE_CLEAN_UP)
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free(lsa);
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}
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#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
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if (mask & A_HOSTNAME)
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sai_hostname = sai.sin_addr.s_addr;
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if (mask & A_NETMASK)
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sai_netmask = sai.sin_addr.s_addr;
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#endif
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p = (char *) &sai;
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#if ENABLE_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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smalluint hw_class= index_in_substrings("ether\0"
|
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USE_FEATURE_HWIB("infiniband\0"), *argv) + 1;
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if (!hw_class || !*++argv)
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bb_show_usage();
|
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/*safe_strncpy(host, *argv, sizeof(host));*/
|
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host = *argv;
|
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if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
|
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bb_error_msg_and_die("invalid hw-addr %s", host);
|
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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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/* FIXME: error check?? */
|
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unsigned long i = strtoul(*argv, NULL, 0);
|
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p = ((char *)&ifr) + a1op->ifr_offset;
|
|
#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
|
|
if (mask & A_MAP_TYPE) {
|
|
xioctl(sockfd, SIOCGIFMAP, &ifr);
|
|
if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
|
|
*((unsigned char *) p) = i;
|
|
else if (mask & A_MAP_USHORT)
|
|
*((unsigned short *) p) = i;
|
|
else
|
|
*((unsigned long *) p) = i;
|
|
} else
|
|
#endif
|
|
if (mask & A_CAST_CHAR_PTR)
|
|
*((caddr_t *) p) = (caddr_t) i;
|
|
else /* A_CAST_INT */
|
|
*((int *) p) = i;
|
|
}
|
|
|
|
ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
|
|
#ifdef QUESTIONABLE_ALIAS_CASE
|
|
if (mask & A_COLON_CHK) {
|
|
/*
|
|
* Don't do the set_flag() if the address is an alias with
|
|
* a '-' at the end, since it's deleted already! - Roman
|
|
*
|
|
* Should really use regex.h here, not sure though how well
|
|
* it'll go with the cross-platform support etc.
|
|
*/
|
|
char *ptr;
|
|
short int found_colon = 0;
|
|
for (ptr = ifr.ifr_name; *ptr; ptr++)
|
|
if (*ptr == ':')
|
|
found_colon++;
|
|
if (found_colon && ptr[-1] == '-')
|
|
continue;
|
|
}
|
|
#endif
|
|
}
|
|
if (!(mask & A_SET_AFTER))
|
|
continue;
|
|
mask = N_SET;
|
|
}
|
|
|
|
xioctl(sockfd, SIOCGIFFLAGS, &ifr);
|
|
selector = op->selector;
|
|
if (mask & SET_MASK)
|
|
ifr.ifr_flags |= selector;
|
|
else
|
|
ifr.ifr_flags &= ~selector;
|
|
xioctl(sockfd, SIOCSIFFLAGS, &ifr);
|
|
} /* while () */
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
close(sockfd);
|
|
return 0;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_IFCONFIG_HW
|
|
/* Input an Ethernet address and convert to binary. */
|
|
static int in_ether(const char *bufp, struct sockaddr *sap)
|
|
{
|
|
char *ptr;
|
|
int i, j;
|
|
unsigned char val;
|
|
unsigned char c;
|
|
|
|
sap->sa_family = ARPHRD_ETHER;
|
|
ptr = (char *) sap->sa_data;
|
|
|
|
i = 0;
|
|
do {
|
|
j = val = 0;
|
|
|
|
/* We might get a semicolon here - not required. */
|
|
if (i && (*bufp == ':')) {
|
|
bufp++;
|
|
}
|
|
|
|
do {
|
|
c = *bufp;
|
|
if (((unsigned char)(c - '0')) <= 9) {
|
|
c -= '0';
|
|
} else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
|
|
c = (c|0x20) - ('a'-10);
|
|
} else if (j && (c == ':' || c == 0)) {
|
|
break;
|
|
} else {
|
|
return -1;
|
|
}
|
|
++bufp;
|
|
val <<= 4;
|
|
val += c;
|
|
} while (++j < 2);
|
|
*ptr++ = val;
|
|
} while (++i < ETH_ALEN);
|
|
|
|
return *bufp; /* Error if we don't end at end of string. */
|
|
}
|
|
#endif
|