Interface datalink layer configuration and statistics viewer for BSD

ifconfig.sysctl.c

/*	sysctl(3)-based ifconfig(8) implementation
	Copyright 2015-2020 Rivoreo

	This Source Code Form is subject to the terms of the Mozilla Public
	License, v. 2.0. If a copy of the MPL was not distributed with this
	file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/

#include <sys/param.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <net/route.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <string.h>
#include <stdio.h>

#if defined __FreeBSD__ && !defined __FreeBSD_kernel__
#define __FreeBSD_kernel__ 1
#endif

#ifndef IFF_SMART
#define IFF_SMART 0x20
#endif

#ifndef IFF_DRV_RUNNING
#ifdef IFF_RUNNING
#define IFF_DRV_RUNNING IFF_RUNNING
#else
#define IFF_DRV_RUNNING 0x40
#endif
#endif

#ifndef IFF_DRV_OACTIVE
#ifdef IFF_OACTIVE
#define IFF_DRV_OACTIVE IFF_OACTIVE
#else
#define IFF_DRV_OACTIVE 0x400
#endif
#endif

#if defined __FreeBSD_kernel__ && __FreeBSD_version >= 1100070
#ifndef IFT_1822
#define IFT_1822 IFT_1822
#endif
#ifndef IFT_HDH1822
#define IFT_HDH1822 IFT_HDH1822
#endif
#ifndef IFT_X25DDN
#define IFT_X25DDN IFT_X25DDN
#endif
#ifndef IFT_X25
#define IFT_X25 IFT_X25
#endif
#ifndef IFT_ETHER
#define IFT_ETHER IFT_ETHER
#endif
#ifndef IFT_ISO88023
#define IFT_ISO88023 IFT_ISO88023
#endif
#ifndef IFT_ISO88024
#define IFT_ISO88024 IFT_ISO88024
#endif
#ifndef IFT_ISO88025
#define IFT_ISO88025 IFT_ISO88025
#endif
#ifndef IFT_ISO88026
#define IFT_ISO88026 IFT_ISO88026
#endif
#ifndef IFT_STARLAN
#define IFT_STARLAN IFT_STARLAN
#endif
#ifndef IFT_P10
#define IFT_P10 IFT_P10
#endif
#ifndef IFT_P80
#define IFT_P80 IFT_P80
#endif
#ifndef IFT_HY
#define IFT_HY IFT_HY
#endif
#ifndef IFT_FDDI
#define IFT_FDDI IFT_FDDI
#endif
#ifndef IFT_LAPB
#define IFT_LAPB IFT_LAPB
#endif
#ifndef IFT_SDLC
#define IFT_SDLC IFT_SDLC
#endif
#ifndef IFT_T1
#define IFT_T1 IFT_T1
#endif
#ifndef IFT_CEPT
#define IFT_CEPT IFT_CEPT
#endif
#ifndef IFT_ISDNBASIC
#define IFT_ISDNBASIC IFT_ISDNBASIC
#endif
#ifndef IFT_ISDNPRIMARY
#define IFT_ISDNPRIMARY IFT_ISDNPRIMARY
#endif
#ifndef IFT_PTPSERIAL
#define IFT_PTPSERIAL IFT_PTPSERIAL
#endif
#ifndef IFT_PPP
#define IFT_PPP IFT_PPP
#endif
#ifndef IFT_LOOP
#define IFT_LOOP IFT_LOOP
#endif
#ifndef IFT_EON
#define IFT_EON IFT_EON
#endif
#ifndef IFT_XETHER
#define IFT_XETHER IFT_XETHER
#endif
#ifndef IFT_NSIP
#define IFT_NSIP IFT_NSIP
#endif
#ifndef IFT_SLIP
#define IFT_SLIP IFT_SLIP
#endif
#ifndef IFT_ULTRA
#define IFT_ULTRA IFT_ULTRA
#endif
#ifndef IFT_DS3
#define IFT_DS3 IFT_DS3
#endif
#ifndef IFT_SIP
#define IFT_SIP IFT_SIP
#endif
#ifndef IFT_FRELAY
#define IFT_FRELAY IFT_FRELAY
#endif
#ifndef IFT_RS232
#define IFT_RS232 IFT_RS232
#endif
#ifndef IFT_PARA
#define IFT_PARA IFT_PARA
#endif
#ifndef IFT_ARCNET
#define IFT_ARCNET IFT_ARCNET
#endif
#ifndef IFT_ARCNETPLUS
#define IFT_ARCNETPLUS IFT_ARCNETPLUS
#endif
#ifndef IFT_ATM
#define IFT_ATM IFT_ATM
#endif
#ifndef IFT_MIOX25
#define IFT_MIOX25 IFT_MIOX25
#endif
#ifndef IFT_SONET
#define IFT_SONET IFT_SONET
#endif
#ifndef IFT_X25PLE
#define IFT_X25PLE IFT_X25PLE
#endif
#ifndef IFT_ISO88022LLC
#define IFT_ISO88022LLC IFT_ISO88022LLC
#endif
#ifndef IFT_LOCALTALK
#define IFT_LOCALTALK IFT_LOCALTALK
#endif
#ifndef IFT_SMDSDXI
#define IFT_SMDSDXI IFT_SMDSDXI
#endif
#ifndef IFT_FRELAYDCE
#define IFT_FRELAYDCE IFT_FRELAYDCE
#endif
#ifndef IFT_V35
#define IFT_V35 IFT_V35
#endif
#ifndef IFT_HSSI
#define IFT_HSSI IFT_HSSI
#endif
#ifndef IFT_HIPPI
#define IFT_HIPPI IFT_HIPPI
#endif
#ifndef IFT_MODEM
#define IFT_MODEM IFT_MODEM
#endif
#ifndef IFT_AAL5
#define IFT_AAL5 IFT_AAL5
#endif
#ifndef IFT_SONETPATH
#define IFT_SONETPATH IFT_SONETPATH
#endif
#ifndef IFT_SONETVT
#define IFT_SONETVT IFT_SONETVT
#endif
#ifndef IFT_SMDSICIP
#define IFT_SMDSICIP IFT_SMDSICIP
#endif
#ifndef IFT_PROPVIRTUAL
#define IFT_PROPVIRTUAL IFT_PROPVIRTUAL
#endif
#ifndef IFT_PROPMUX
#define IFT_PROPMUX IFT_PROPMUX
#endif
#ifndef IFT_IEEE80212
#define IFT_IEEE80212 IFT_IEEE80212
#endif
#ifndef IFT_FIBRECHANNEL
#define IFT_FIBRECHANNEL IFT_FIBRECHANNEL
#endif
#ifndef IFT_HIPPIINTERFACE
#define IFT_HIPPIINTERFACE IFT_HIPPIINTERFACE
#endif
#ifndef IFT_FRAMERELAYINTERCONNECT
#define IFT_FRAMERELAYINTERCONNECT IFT_FRAMERELAYINTERCONNECT
#endif
#ifndef IFT_AFLANE8023
#define IFT_AFLANE8023 IFT_AFLANE8023
#endif
#ifndef IFT_AFLANE8025
#define IFT_AFLANE8025 IFT_AFLANE8025
#endif
#ifndef IFT_CCTEMUL
#define IFT_CCTEMUL IFT_CCTEMUL
#endif
#ifndef IFT_FASTETHER
#define IFT_FASTETHER IFT_FASTETHER
#endif
#ifndef IFT_ISDN
#define IFT_ISDN IFT_ISDN
#endif
#ifndef IFT_V11
#define IFT_V11 IFT_V11
#endif
#ifndef IFT_V36
#define IFT_V36 IFT_V36
#endif
#ifndef IFT_G703AT64K
#define IFT_G703AT64K IFT_G703AT64K
#endif
#ifndef IFT_G703AT2MB
#define IFT_G703AT2MB IFT_G703AT2MB
#endif
#ifndef IFT_QLLC
#define IFT_QLLC IFT_QLLC
#endif
#ifndef IFT_FASTETHERFX
#define IFT_FASTETHERFX IFT_FASTETHERFX
#endif
#ifndef IFT_CHANNEL
#define IFT_CHANNEL IFT_CHANNEL
#endif
#ifndef IFT_IEEE80211
#define IFT_IEEE80211 IFT_IEEE80211
#endif
#ifndef IFT_IBM370PARCHAN
#define IFT_IBM370PARCHAN IFT_IBM370PARCHAN
#endif
#ifndef IFT_ESCON
#define IFT_ESCON IFT_ESCON
#endif
#ifndef IFT_DLSW
#define IFT_DLSW IFT_DLSW
#endif
#ifndef IFT_ISDNS
#define IFT_ISDNS IFT_ISDNS
#endif
#ifndef IFT_ISDNU
#define IFT_ISDNU IFT_ISDNU
#endif
#ifndef IFT_LAPD
#define IFT_LAPD IFT_LAPD
#endif
#ifndef IFT_IPSWITCH
#define IFT_IPSWITCH IFT_IPSWITCH
#endif
#ifndef IFT_RSRB
#define IFT_RSRB IFT_RSRB
#endif
#ifndef IFT_ATMLOGICAL
#define IFT_ATMLOGICAL IFT_ATMLOGICAL
#endif
#ifndef IFT_DS0
#define IFT_DS0 IFT_DS0
#endif
#ifndef IFT_DS0BUNDLE
#define IFT_DS0BUNDLE IFT_DS0BUNDLE
#endif
#ifndef IFT_BSC
#define IFT_BSC IFT_BSC
#endif
#ifndef IFT_ASYNC
#define IFT_ASYNC IFT_ASYNC
#endif
#ifndef IFT_CNR
#define IFT_CNR IFT_CNR
#endif
#ifndef IFT_ISO88025DTR
#define IFT_ISO88025DTR IFT_ISO88025DTR
#endif
#ifndef IFT_EPLRS
#define IFT_EPLRS IFT_EPLRS
#endif
#ifndef IFT_ARAP
#define IFT_ARAP IFT_ARAP
#endif
#ifndef IFT_PROPCNLS
#define IFT_PROPCNLS IFT_PROPCNLS
#endif
#ifndef IFT_HOSTPAD
#define IFT_HOSTPAD IFT_HOSTPAD
#endif
#ifndef IFT_TERMPAD
#define IFT_TERMPAD IFT_TERMPAD
#endif
#ifndef IFT_FRAMERELAYMPI
#define IFT_FRAMERELAYMPI IFT_FRAMERELAYMPI
#endif
#ifndef IFT_X213
#define IFT_X213 IFT_X213
#endif
#ifndef IFT_ADSL
#define IFT_ADSL IFT_ADSL
#endif
#ifndef IFT_RADSL
#define IFT_RADSL IFT_RADSL
#endif
#ifndef IFT_SDSL
#define IFT_SDSL IFT_SDSL
#endif
#ifndef IFT_VDSL
#define IFT_VDSL IFT_VDSL
#endif
#ifndef IFT_ISO88025CRFPINT
#define IFT_ISO88025CRFPINT IFT_ISO88025CRFPINT
#endif
#ifndef IFT_MYRINET
#define IFT_MYRINET IFT_MYRINET
#endif
#ifndef IFT_VOICEEM
#define IFT_VOICEEM IFT_VOICEEM
#endif
#ifndef IFT_VOICEFXO
#define IFT_VOICEFXO IFT_VOICEFXO
#endif
#ifndef IFT_VOICEFXS
#define IFT_VOICEFXS IFT_VOICEFXS
#endif
#ifndef IFT_VOICEENCAP
#define IFT_VOICEENCAP IFT_VOICEENCAP
#endif
#ifndef IFT_VOICEOVERIP
#define IFT_VOICEOVERIP IFT_VOICEOVERIP
#endif
#ifndef IFT_ATMDXI
#define IFT_ATMDXI IFT_ATMDXI
#endif
#ifndef IFT_ATMFUNI
#define IFT_ATMFUNI IFT_ATMFUNI
#endif
#ifndef IFT_ATMIMA
#define IFT_ATMIMA IFT_ATMIMA
#endif
#ifndef IFT_PPPMULTILINKBUNDLE
#define IFT_PPPMULTILINKBUNDLE IFT_PPPMULTILINKBUNDLE
#endif
#ifndef IFT_IPOVERCDLC
#define IFT_IPOVERCDLC IFT_IPOVERCDLC
#endif
#ifndef IFT_IPOVERCLAW
#define IFT_IPOVERCLAW IFT_IPOVERCLAW
#endif
#ifndef IFT_STACKTOSTACK
#define IFT_STACKTOSTACK IFT_STACKTOSTACK
#endif
#ifndef IFT_VIRTUALIPADDRESS
#define IFT_VIRTUALIPADDRESS IFT_VIRTUALIPADDRESS
#endif
#ifndef IFT_MPC
#define IFT_MPC IFT_MPC
#endif
#ifndef IFT_IPOVERATM
#define IFT_IPOVERATM IFT_IPOVERATM
#endif
#ifndef IFT_ISO88025FIBER
#define IFT_ISO88025FIBER IFT_ISO88025FIBER
#endif
#ifndef IFT_TDLC
#define IFT_TDLC IFT_TDLC
#endif
#ifndef IFT_GIGABITETHERNET
#define IFT_GIGABITETHERNET IFT_GIGABITETHERNET
#endif
#ifndef IFT_HDLC
#define IFT_HDLC IFT_HDLC
#endif
#ifndef IFT_LAPF
#define IFT_LAPF IFT_LAPF
#endif
#ifndef IFT_V37
#define IFT_V37 IFT_V37
#endif
#ifndef IFT_X25MLP
#define IFT_X25MLP IFT_X25MLP
#endif
#ifndef IFT_X25HUNTGROUP
#define IFT_X25HUNTGROUP IFT_X25HUNTGROUP
#endif
#ifndef IFT_TRANSPHDLC
#define IFT_TRANSPHDLC IFT_TRANSPHDLC
#endif
#ifndef IFT_INTERLEAVE
#define IFT_INTERLEAVE IFT_INTERLEAVE
#endif
#ifndef IFT_FAST
#define IFT_FAST IFT_FAST
#endif
#ifndef IFT_IP
#define IFT_IP IFT_IP
#endif
#ifndef IFT_DOCSCABLEMACLAYER
#define IFT_DOCSCABLEMACLAYER IFT_DOCSCABLEMACLAYER
#endif
#ifndef IFT_DOCSCABLEDOWNSTREAM
#define IFT_DOCSCABLEDOWNSTREAM IFT_DOCSCABLEDOWNSTREAM
#endif
#ifndef IFT_DOCSCABLEUPSTREAM
#define IFT_DOCSCABLEUPSTREAM IFT_DOCSCABLEUPSTREAM
#endif
#ifndef IFT_A12MPPSWITCH
#define IFT_A12MPPSWITCH IFT_A12MPPSWITCH
#endif
#ifndef IFT_TUNNEL
#define IFT_TUNNEL IFT_TUNNEL
#endif
#ifndef IFT_COFFEE
#define IFT_COFFEE IFT_COFFEE
#endif
#ifndef IFT_CES
#define IFT_CES IFT_CES
#endif
#ifndef IFT_ATMSUBINTERFACE
#define IFT_ATMSUBINTERFACE IFT_ATMSUBINTERFACE
#endif
#ifndef IFT_L2VLAN
#define IFT_L2VLAN IFT_L2VLAN
#endif
#ifndef IFT_L3IPVLAN
#define IFT_L3IPVLAN IFT_L3IPVLAN
#endif
#ifndef IFT_L3IPXVLAN
#define IFT_L3IPXVLAN IFT_L3IPXVLAN
#endif
#ifndef IFT_DIGITALPOWERLINE
#define IFT_DIGITALPOWERLINE IFT_DIGITALPOWERLINE
#endif
#ifndef IFT_MEDIAMAILOVERIP
#define IFT_MEDIAMAILOVERIP IFT_MEDIAMAILOVERIP
#endif
#ifndef IFT_DTM
#define IFT_DTM IFT_DTM
#endif
#ifndef IFT_DCN
#define IFT_DCN IFT_DCN
#endif
#ifndef IFT_IPFORWARD
#define IFT_IPFORWARD IFT_IPFORWARD
#endif
#ifndef IFT_MSDSL
#define IFT_MSDSL IFT_MSDSL
#endif
#ifndef IFT_IEEE1394
#define IFT_IEEE1394 IFT_IEEE1394
#endif
#ifndef IFT_IFGSN
#define IFT_IFGSN IFT_IFGSN
#endif
#ifndef IFT_DVBRCCMACLAYER
#define IFT_DVBRCCMACLAYER IFT_DVBRCCMACLAYER
#endif
#ifndef IFT_DVBRCCDOWNSTREAM
#define IFT_DVBRCCDOWNSTREAM IFT_DVBRCCDOWNSTREAM
#endif
#ifndef IFT_DVBRCCUPSTREAM
#define IFT_DVBRCCUPSTREAM IFT_DVBRCCUPSTREAM
#endif
#ifndef IFT_ATMVIRTUAL
#define IFT_ATMVIRTUAL IFT_ATMVIRTUAL
#endif
#ifndef IFT_MPLSTUNNEL
#define IFT_MPLSTUNNEL IFT_MPLSTUNNEL
#endif
#ifndef IFT_SRP
#define IFT_SRP IFT_SRP
#endif
#ifndef IFT_VOICEOVERATM
#define IFT_VOICEOVERATM IFT_VOICEOVERATM
#endif
#ifndef IFT_VOICEOVERFRAMERELAY
#define IFT_VOICEOVERFRAMERELAY IFT_VOICEOVERFRAMERELAY
#endif
#ifndef IFT_IDSL
#define IFT_IDSL IFT_IDSL
#endif
#ifndef IFT_COMPOSITELINK
#define IFT_COMPOSITELINK IFT_COMPOSITELINK
#endif
#ifndef IFT_SS7SIGLINK
#define IFT_SS7SIGLINK IFT_SS7SIGLINK
#endif
#ifndef IFT_PROPWIRELESSP2P
#define IFT_PROPWIRELESSP2P IFT_PROPWIRELESSP2P
#endif
#ifndef IFT_FRFORWARD
#define IFT_FRFORWARD IFT_FRFORWARD
#endif
#ifndef IFT_RFC1483
#define IFT_RFC1483 IFT_RFC1483
#endif
#ifndef IFT_USB
#define IFT_USB IFT_USB
#endif
#ifndef IFT_IEEE8023ADLAG
#define IFT_IEEE8023ADLAG IFT_IEEE8023ADLAG
#endif
#ifndef IFT_BGPPOLICYACCOUNTING
#define IFT_BGPPOLICYACCOUNTING IFT_BGPPOLICYACCOUNTING
#endif
#ifndef IFT_FRF16MFRBUNDLE
#define IFT_FRF16MFRBUNDLE IFT_FRF16MFRBUNDLE
#endif
#ifndef IFT_H323GATEKEEPER
#define IFT_H323GATEKEEPER IFT_H323GATEKEEPER
#endif
#ifndef IFT_H323PROXY
#define IFT_H323PROXY IFT_H323PROXY
#endif
#ifndef IFT_MPLS
#define IFT_MPLS IFT_MPLS
#endif
#ifndef IFT_MFSIGLINK
#define IFT_MFSIGLINK IFT_MFSIGLINK
#endif
#ifndef IFT_HDSL2
#define IFT_HDSL2 IFT_HDSL2
#endif
#ifndef IFT_SHDSL
#define IFT_SHDSL IFT_SHDSL
#endif
#ifndef IFT_DS1FDL
#define IFT_DS1FDL IFT_DS1FDL
#endif
#ifndef IFT_POS
#define IFT_POS IFT_POS
#endif
#ifndef IFT_DVBASILN
#define IFT_DVBASILN IFT_DVBASILN
#endif
#ifndef IFT_DVBASIOUT
#define IFT_DVBASIOUT IFT_DVBASIOUT
#endif
#ifndef IFT_PLC
#define IFT_PLC IFT_PLC
#endif
#ifndef IFT_NFAS
#define IFT_NFAS IFT_NFAS
#endif
#ifndef IFT_TR008
#define IFT_TR008 IFT_TR008
#endif
#ifndef IFT_GR303RDT
#define IFT_GR303RDT IFT_GR303RDT
#endif
#ifndef IFT_GR303IDT
#define IFT_GR303IDT IFT_GR303IDT
#endif
#ifndef IFT_ISUP
#define IFT_ISUP IFT_ISUP
#endif
#ifndef IFT_PROPDOCSWIRELESSMACLAYER
#define IFT_PROPDOCSWIRELESSMACLAYER IFT_PROPDOCSWIRELESSMACLAYER
#endif
#ifndef IFT_PROPDOCSWIRELESSDOWNSTREAM
#define IFT_PROPDOCSWIRELESSDOWNSTREAM IFT_PROPDOCSWIRELESSDOWNSTREAM
#endif
#ifndef IFT_PROPDOCSWIRELESSUPSTREAM
#define IFT_PROPDOCSWIRELESSUPSTREAM IFT_PROPDOCSWIRELESSUPSTREAM
#endif
#ifndef IFT_HIPERLAN2
#define IFT_HIPERLAN2 IFT_HIPERLAN2
#endif
#ifndef IFT_PROPBWAP2MP
#define IFT_PROPBWAP2MP IFT_PROPBWAP2MP
#endif
#ifndef IFT_SONETOVERHEADCHANNEL
#define IFT_SONETOVERHEADCHANNEL IFT_SONETOVERHEADCHANNEL
#endif
#ifndef IFT_DIGITALWRAPPEROVERHEADCHANNEL
#define IFT_DIGITALWRAPPEROVERHEADCHANNEL IFT_DIGITALWRAPPEROVERHEADCHANNEL
#endif
#ifndef IFT_AAL2
#define IFT_AAL2 IFT_AAL2
#endif
#ifndef IFT_RADIOMAC
#define IFT_RADIOMAC IFT_RADIOMAC
#endif
#ifndef IFT_ATMRADIO
#define IFT_ATMRADIO IFT_ATMRADIO
#endif
#ifndef IFT_IMT
#define IFT_IMT IFT_IMT
#endif
#ifndef IFT_MVL
#define IFT_MVL IFT_MVL
#endif
#ifndef IFT_REACHDSL
#define IFT_REACHDSL IFT_REACHDSL
#endif
#ifndef IFT_FRDLCIENDPT
#define IFT_FRDLCIENDPT IFT_FRDLCIENDPT
#endif
#ifndef IFT_ATMVCIENDPT
#define IFT_ATMVCIENDPT IFT_ATMVCIENDPT
#endif
#ifndef IFT_OPTICALCHANNEL
#define IFT_OPTICALCHANNEL IFT_OPTICALCHANNEL
#endif
#ifndef IFT_OPTICALTRANSPORT
#define IFT_OPTICALTRANSPORT IFT_OPTICALTRANSPORT
#endif
#ifndef IFT_INFINIBAND
#define IFT_INFINIBAND IFT_INFINIBAND
#endif
#ifndef IFT_BRIDGE
#define IFT_BRIDGE IFT_BRIDGE
#endif
#ifndef IFT_STF
#define IFT_STF IFT_STF
#endif
#ifndef IFT_GIF
#define IFT_GIF IFT_GIF
#endif
#ifndef IFT_PVC
#define IFT_PVC IFT_PVC
#endif
#ifndef IFT_FAITH
#define IFT_FAITH IFT_FAITH
#endif
#ifndef IFT_ENC
#define IFT_ENC IFT_ENC
#endif
#ifndef IFT_PFLOG
#define IFT_PFLOG IFT_PFLOG
#endif
#ifndef IFT_PFSYNC
#define IFT_PFSYNC IFT_PFSYNC
#endif
#ifndef IFT_IPXIP
#define IFT_IPXIP IFT_IPXIP
#endif
#endif

static void print_usage(const char *name) {
	fprintf(stderr, "Usage: %s { -a | <interface> }\n", name);
}

static void print_interface_flags(unsigned int flags) {
	static const struct {
		unsigned int flag;
		const char *name;
	} flag_names[] = {
		{ IFF_UP, "UP" },
		{ IFF_BROADCAST, "BROADCAST" },
		{ IFF_DEBUG, "DEBUG" },
		{ IFF_LOOPBACK, "LOOPBACK" },
		{ IFF_POINTOPOINT, "POINTOPOINT" },
		{ IFF_SMART, "SMART" },
		{ IFF_DRV_RUNNING, "RUNNING" },
		{ IFF_NOARP, "NOARP" },
		{ IFF_PROMISC, "PROMISC" },
		{ IFF_ALLMULTI, "ALLMULTI" },
		{ IFF_DRV_OACTIVE, "OACTIVE" },
		{ IFF_SIMPLEX, "SIMPLEX" },
		{ IFF_LINK0, "LINK0" },
		{ IFF_LINK1, "LINK1" },
		{ IFF_LINK2, "LINK2" },
		{ IFF_ALTPHYS, "ALTPHYS" },
		{ IFF_MULTICAST, "MULTICAST" },
#ifdef IFF_CANTCONFIG
		{ IFF_CANTCONFIG, "CANTCONFIG" },
#endif
#ifdef IFF_PPROMISC
		{ IFF_PPROMISC, "PPROMISC" },
#endif
#ifdef IFF_MONITOR
		{ IFF_MONITOR, "MONITOR" },
#endif
#ifdef IFF_STATICARP
		{ IFF_STATICARP, "STATICARP" },
#endif
	};
	int more = 0;
	unsigned int i = 0;
	do {
		if(!(flags & flag_names[i].flag)) continue;
		if(more) putchar(',');
		fputs(flag_names[i].name, stdout);
		more = 1;
	} while(++i < sizeof flag_names / sizeof *flag_names);
}

static void print_datalink_name_and_address(const struct sockaddr_dl *sdl) {
	putchar('	');
	switch(sdl->sdl_type) {
#ifdef IFT_1822
		case IFT_1822:
			fputs("1822", stdout);
			break;
#endif
#ifdef IFT_HDH1822
		case IFT_HDH1822:
			fputs("hdh1822", stdout);
			break;
#endif
#ifdef IFT_X25DDN
		case IFT_X25DDN:
			fputs("x25ddn", stdout);
			break;
#endif
#ifdef IFT_X25
		case IFT_X25:
			fputs("x25", stdout);
			break;
#endif
#ifdef IFT_ETHER
		case IFT_ETHER:
			fputs("ether", stdout);
			break;
#endif
#ifdef IFT_ISO88023
		case IFT_ISO88023:
			fputs("iso88023", stdout);
			break;
#endif
#ifdef IFT_ISO88024
		case IFT_ISO88024:
			fputs("iso88024", stdout);
			break;
#endif
#ifdef IFT_ISO88025
		case IFT_ISO88025:
			fputs("iso88025", stdout);
			break;
#endif
#ifdef IFT_ISO88026
		case IFT_ISO88026:
			fputs("iso88026", stdout);
			break;
#endif
#ifdef IFT_STARLAN
		case IFT_STARLAN:
			fputs("starlan", stdout);
			break;
#endif
#ifdef IFT_P10
		case IFT_P10:
			fputs("p10", stdout);
			break;
#endif
#ifdef IFT_P80
		case IFT_P80:
			fputs("p80", stdout);
			break;
#endif
#ifdef IFT_HY
		case IFT_HY:
			fputs("hy", stdout);
			break;
#endif
#ifdef IFT_FDDI
		case IFT_FDDI:
			fputs("fddi", stdout);
			break;
#endif
#ifdef IFT_LAPB
		case IFT_LAPB:
			fputs("lapb", stdout);
			break;
#endif
#ifdef IFT_SDLC
		case IFT_SDLC:
			fputs("sdlc", stdout);
			break;
#endif
#ifdef IFT_T1
		case IFT_T1:
			fputs("t1", stdout);
			break;
#endif
#ifdef IFT_CEPT
		case IFT_CEPT:
			fputs("cept", stdout);
			break;
#endif
#ifdef IFT_ISDNBASIC
		case IFT_ISDNBASIC:
			fputs("isdnbasic", stdout);
			break;
#endif
#ifdef IFT_ISDNPRIMARY
		case IFT_ISDNPRIMARY:
			fputs("isdnprimary", stdout);
			break;
#endif
#ifdef IFT_PTPSERIAL
		case IFT_PTPSERIAL:
			fputs("ptpserial", stdout);
			break;
#endif
#ifdef IFT_PPP
		case IFT_PPP:
			fputs("ppp", stdout);
			break;
#endif
#ifdef IFT_LOOP
		case IFT_LOOP:
			fputs("loop", stdout);
			break;
#endif
#ifdef IFT_EON
		case IFT_EON:
			fputs("eon", stdout);
			break;
#endif
#ifdef IFT_XETHER
		case IFT_XETHER:
			fputs("xether", stdout);
			break;
#endif
#ifdef IFT_NSIP
		case IFT_NSIP:
			fputs("nsip", stdout);
			break;
#endif
#ifdef IFT_SLIP
		case IFT_SLIP:
			fputs("slip", stdout);
			break;
#endif
#ifdef IFT_ULTRA
		case IFT_ULTRA:
			fputs("ultra", stdout);
			break;
#endif
#ifdef IFT_DS3
		case IFT_DS3:
			fputs("ds3", stdout);
			break;
#endif
#ifdef IFT_SIP
		case IFT_SIP:
			fputs("sip", stdout);
			break;
#endif
#ifdef IFT_FRELAY
		case IFT_FRELAY:
			fputs("frelay", stdout);
			break;
#endif
#ifdef IFT_RS232
		case IFT_RS232:
			fputs("rs232", stdout);
			break;
#endif
#ifdef IFT_PARA
		case IFT_PARA:
			fputs("para", stdout);
			break;
#endif
#ifdef IFT_ARCNET
		case IFT_ARCNET:
			fputs("arcnet", stdout);
			break;
#endif
#ifdef IFT_ARCNETPLUS
		case IFT_ARCNETPLUS:
			fputs("arcnetplus", stdout);
			break;
#endif
#ifdef IFT_ATM
		case IFT_ATM:
			fputs("atm", stdout);
			break;
#endif
#ifdef IFT_MIOX25
		case IFT_MIOX25:
			fputs("miox25", stdout);
			break;
#endif
#ifdef IFT_SONET
		case IFT_SONET:
			fputs("sonet", stdout);
			break;
#endif
#ifdef IFT_X25PLE
		case IFT_X25PLE:
			fputs("x25ple", stdout);
			break;
#endif
#ifdef IFT_ISO88022LLC
		case IFT_ISO88022LLC:
			fputs("iso88022llc", stdout);
			break;
#endif
#ifdef IFT_LOCALTALK
		case IFT_LOCALTALK:
			fputs("localtalk", stdout);
			break;
#endif
#ifdef IFT_SMDSDXI
		case IFT_SMDSDXI:
			fputs("smdsdxi", stdout);
			break;
#endif
#ifdef IFT_FRELAYDCE
		case IFT_FRELAYDCE:
			fputs("frelaydce", stdout);
			break;
#endif
#ifdef IFT_V35
		case IFT_V35:
			fputs("v35", stdout);
			break;
#endif
#ifdef IFT_HSSI
		case IFT_HSSI:
			fputs("hssi", stdout);
			break;
#endif
#ifdef IFT_HIPPI
		case IFT_HIPPI:
			fputs("hippi", stdout);
			break;
#endif
#ifdef IFT_MODEM
		case IFT_MODEM:
			fputs("modem", stdout);
			break;
#endif
#ifdef IFT_AAL5
		case IFT_AAL5:
			fputs("aal5", stdout);
			break;
#endif
#ifdef IFT_SONETPATH
		case IFT_SONETPATH:
			fputs("sonetpath", stdout);
			break;
#endif
#ifdef IFT_SONETVT
		case IFT_SONETVT:
			fputs("sonetvt", stdout);
			break;
#endif
#ifdef IFT_SMDSICIP
		case IFT_SMDSICIP:
			fputs("smdsicip", stdout);
			break;
#endif
#ifdef IFT_PROPVIRTUAL
		case IFT_PROPVIRTUAL:
			fputs("propvirtual", stdout);
			break;
#endif
#ifdef IFT_PROPMUX
		case IFT_PROPMUX:
			fputs("propmux", stdout);
			break;
#endif
#ifdef IFT_IEEE80212
		case IFT_IEEE80212:
			fputs("ieee80212", stdout);
			break;
#endif
#ifdef IFT_FIBRECHANNEL
		case IFT_FIBRECHANNEL:
			fputs("fibrechannel", stdout);
			break;
#endif
#ifdef IFT_HIPPIINTERFACE
		case IFT_HIPPIINTERFACE:
			fputs("hippiinterface", stdout);
			break;
#endif
#ifdef IFT_FRAMERELAYINTERCONNECT
		case IFT_FRAMERELAYINTERCONNECT:
			fputs("framerelayinterconnect", stdout);
			break;
#endif
#ifdef IFT_AFLANE8023
		case IFT_AFLANE8023:
			fputs("aflane8023", stdout);
			break;
#endif
#ifdef IFT_AFLANE8025
		case IFT_AFLANE8025:
			fputs("aflane8025", stdout);
			break;
#endif
#ifdef IFT_CCTEMUL
		case IFT_CCTEMUL:
			fputs("cctemul", stdout);
			break;
#endif
#ifdef IFT_FASTETHER
		case IFT_FASTETHER:
			fputs("fastether", stdout);
			break;
#endif
#ifdef IFT_ISDN
		case IFT_ISDN:
			fputs("isdn", stdout);
			break;
#endif
#ifdef IFT_V11
		case IFT_V11:
			fputs("v11", stdout);
			break;
#endif
#ifdef IFT_V36
		case IFT_V36:
			fputs("v36", stdout);
			break;
#endif
#ifdef IFT_G703AT64K
		case IFT_G703AT64K:
			fputs("g703at64k", stdout);
			break;
#endif
#ifdef IFT_G703AT2MB
		case IFT_G703AT2MB:
			fputs("g703at2mb", stdout);
			break;
#endif
#ifdef IFT_QLLC
		case IFT_QLLC:
			fputs("qllc", stdout);
			break;
#endif
#ifdef IFT_FASTETHERFX
		case IFT_FASTETHERFX:
			fputs("fastetherfx", stdout);
			break;
#endif
#ifdef IFT_CHANNEL
		case IFT_CHANNEL:
			fputs("channel", stdout);
			break;
#endif
#ifdef IFT_IEEE80211
		case IFT_IEEE80211:
			fputs("ieee80211", stdout);
			break;
#endif
#ifdef IFT_IBM370PARCHAN
		case IFT_IBM370PARCHAN:
			fputs("ibm370parchan", stdout);
			break;
#endif
#ifdef IFT_ESCON
		case IFT_ESCON:
			fputs("escon", stdout);
			break;
#endif
#ifdef IFT_DLSW
		case IFT_DLSW:
			fputs("dlsw", stdout);
			break;
#endif
#ifdef IFT_ISDNS
		case IFT_ISDNS:
			fputs("isdns", stdout);
			break;
#endif
#ifdef IFT_ISDNU
		case IFT_ISDNU:
			fputs("isdnu", stdout);
			break;
#endif
#ifdef IFT_LAPD
		case IFT_LAPD:
			fputs("lapd", stdout);
			break;
#endif
#ifdef IFT_IPSWITCH
		case IFT_IPSWITCH:
			fputs("ipswitch", stdout);
			break;
#endif
#ifdef IFT_RSRB
		case IFT_RSRB:
			fputs("rsrb", stdout);
			break;
#endif
#ifdef IFT_ATMLOGICAL
		case IFT_ATMLOGICAL:
			fputs("atmlogical", stdout);
			break;
#endif
#ifdef IFT_DS0
		case IFT_DS0:
			fputs("ds0", stdout);
			break;
#endif
#ifdef IFT_DS0BUNDLE
		case IFT_DS0BUNDLE:
			fputs("ds0bundle", stdout);
			break;
#endif
#ifdef IFT_BSC
		case IFT_BSC:
			fputs("bsc", stdout);
			break;
#endif
#ifdef IFT_ASYNC
		case IFT_ASYNC:
			fputs("async", stdout);
			break;
#endif
#ifdef IFT_CNR
		case IFT_CNR:
			fputs("cnr", stdout);
			break;
#endif
#ifdef IFT_ISO88025DTR
		case IFT_ISO88025DTR:
			fputs("iso88025dtr", stdout);
			break;
#endif
#ifdef IFT_EPLRS
		case IFT_EPLRS:
			fputs("eplrs", stdout);
			break;
#endif
#ifdef IFT_ARAP
		case IFT_ARAP:
			fputs("arap", stdout);
			break;
#endif
#ifdef IFT_PROPCNLS
		case IFT_PROPCNLS:
			fputs("propcnls", stdout);
			break;
#endif
#ifdef IFT_HOSTPAD
		case IFT_HOSTPAD:
			fputs("hostpad", stdout);
			break;
#endif
#ifdef IFT_TERMPAD
		case IFT_TERMPAD:
			fputs("termpad", stdout);
			break;
#endif
#ifdef IFT_FRAMERELAYMPI
		case IFT_FRAMERELAYMPI:
			fputs("framerelaympi", stdout);
			break;
#endif
#ifdef IFT_X213
		case IFT_X213:
			fputs("x213", stdout);
			break;
#endif
#ifdef IFT_ADSL
		case IFT_ADSL:
			fputs("adsl", stdout);
			break;
#endif
#ifdef IFT_RADSL
		case IFT_RADSL:
			fputs("radsl", stdout);
			break;
#endif
#ifdef IFT_SDSL
		case IFT_SDSL:
			fputs("sdsl", stdout);
			break;
#endif
#ifdef IFT_VDSL
		case IFT_VDSL:
			fputs("vdsl", stdout);
			break;
#endif
#ifdef IFT_ISO88025CRFPINT
		case IFT_ISO88025CRFPINT:
			fputs("iso88025crfpint", stdout);
			break;
#endif
#ifdef IFT_MYRINET
		case IFT_MYRINET:
			fputs("myrinet", stdout);
			break;
#endif
#ifdef IFT_VOICEEM
		case IFT_VOICEEM:
			fputs("voiceem", stdout);
			break;
#endif
#ifdef IFT_VOICEFXO
		case IFT_VOICEFXO:
			fputs("voicefxo", stdout);
			break;
#endif
#ifdef IFT_VOICEFXS
		case IFT_VOICEFXS:
			fputs("voicefxs", stdout);
			break;
#endif
#ifdef IFT_VOICEENCAP
		case IFT_VOICEENCAP:
			fputs("voiceencap", stdout);
			break;
#endif
#ifdef IFT_VOICEOVERIP
		case IFT_VOICEOVERIP:
			fputs("voiceoverip", stdout);
			break;
#endif
#ifdef IFT_ATMDXI
		case IFT_ATMDXI:
			fputs("atmdxi", stdout);
			break;
#endif
#ifdef IFT_ATMFUNI
		case IFT_ATMFUNI:
			fputs("atmfuni", stdout);
			break;
#endif
#ifdef IFT_ATMIMA
		case IFT_ATMIMA:
			fputs("atmima", stdout);
			break;
#endif
#ifdef IFT_PPPMULTILINKBUNDLE
		case IFT_PPPMULTILINKBUNDLE:
			fputs("pppmultilinkbundle", stdout);
			break;
#endif
#ifdef IFT_IPOVERCDLC
		case IFT_IPOVERCDLC:
			fputs("ipovercdlc", stdout);
			break;
#endif
#ifdef IFT_IPOVERCLAW
		case IFT_IPOVERCLAW:
			fputs("ipoverclaw", stdout);
			break;
#endif
#ifdef IFT_STACKTOSTACK
		case IFT_STACKTOSTACK:
			fputs("stacktostack", stdout);
			break;
#endif
#ifdef IFT_VIRTUALIPADDRESS
		case IFT_VIRTUALIPADDRESS:
			fputs("virtualipaddress", stdout);
			break;
#endif
#ifdef IFT_MPC
		case IFT_MPC:
			fputs("mpc", stdout);
			break;
#endif
#ifdef IFT_IPOVERATM
		case IFT_IPOVERATM:
			fputs("ipoveratm", stdout);
			break;
#endif
#ifdef IFT_ISO88025FIBER
		case IFT_ISO88025FIBER:
			fputs("iso88025fiber", stdout);
			break;
#endif
#ifdef IFT_TDLC
		case IFT_TDLC:
			fputs("tdlc", stdout);
			break;
#endif
#ifdef IFT_GIGABITETHERNET
		case IFT_GIGABITETHERNET:
			fputs("gigabitethernet", stdout);
			break;
#endif
#ifdef IFT_HDLC
		case IFT_HDLC:
			fputs("hdlc", stdout);
			break;
#endif
#ifdef IFT_LAPF
		case IFT_LAPF:
			fputs("lapf", stdout);
			break;
#endif
#ifdef IFT_V37
		case IFT_V37:
			fputs("v37", stdout);
			break;
#endif
#ifdef IFT_X25MLP
		case IFT_X25MLP:
			fputs("x25mlp", stdout);
			break;
#endif
#ifdef IFT_X25HUNTGROUP
		case IFT_X25HUNTGROUP:
			fputs("x25huntgroup", stdout);
			break;
#endif
#ifdef IFT_TRANSPHDLC
		case IFT_TRANSPHDLC:
			fputs("transphdlc", stdout);
			break;
#endif
#ifdef IFT_INTERLEAVE
		case IFT_INTERLEAVE:
			fputs("interleave", stdout);
			break;
#endif
#ifdef IFT_FAST
		case IFT_FAST:
			fputs("fast", stdout);
			break;
#endif
#ifdef IFT_IP
		case IFT_IP:
			fputs("ip", stdout);
			break;
#endif
#ifdef IFT_DOCSCABLEMACLAYER
		case IFT_DOCSCABLEMACLAYER:
			fputs("docscablemaclayer", stdout);
			break;
#endif
#ifdef IFT_DOCSCABLEDOWNSTREAM
		case IFT_DOCSCABLEDOWNSTREAM:
			fputs("docscabledownstream", stdout);
			break;
#endif
#ifdef IFT_DOCSCABLEUPSTREAM
		case IFT_DOCSCABLEUPSTREAM:
			fputs("docscableupstream", stdout);
			break;
#endif
#ifdef IFT_A12MPPSWITCH
		case IFT_A12MPPSWITCH:
			fputs("a12mppswitch", stdout);
			break;
#endif
#ifdef IFT_TUNNEL
		case IFT_TUNNEL:
			fputs("tunnel", stdout);
			break;
#endif
#ifdef IFT_COFFEE
		case IFT_COFFEE:
			fputs("coffee", stdout);
			break;
#endif
#ifdef IFT_CES
		case IFT_CES:
			fputs("ces", stdout);
			break;
#endif
#ifdef IFT_ATMSUBINTERFACE
		case IFT_ATMSUBINTERFACE:
			fputs("atmsubinterface", stdout);
			break;
#endif
#ifdef IFT_L2VLAN
		case IFT_L2VLAN:
			fputs("l2vlan", stdout);
			break;
#endif
#ifdef IFT_L3IPVLAN
		case IFT_L3IPVLAN:
			fputs("l3ipvlan", stdout);
			break;
#endif
#ifdef IFT_L3IPXVLAN
		case IFT_L3IPXVLAN:
			fputs("l3ipxvlan", stdout);
			break;
#endif
#ifdef IFT_DIGITALPOWERLINE
		case IFT_DIGITALPOWERLINE:
			fputs("digitalpowerline", stdout);
			break;
#endif
#ifdef IFT_MEDIAMAILOVERIP
		case IFT_MEDIAMAILOVERIP:
			fputs("mediamailoverip", stdout);
			break;
#endif
#ifdef IFT_DTM
		case IFT_DTM:
			fputs("dtm", stdout);
			break;
#endif
#ifdef IFT_DCN
		case IFT_DCN:
			fputs("dcn", stdout);
			break;
#endif
#ifdef IFT_IPFORWARD
		case IFT_IPFORWARD:
			fputs("ipforward", stdout);
			break;
#endif
#ifdef IFT_MSDSL
		case IFT_MSDSL:
			fputs("msdsl", stdout);
			break;
#endif
#ifdef IFT_IEEE1394
		case IFT_IEEE1394:
			fputs("ieee1394", stdout);
			break;
#endif
#ifdef IFT_IFGSN
		case IFT_IFGSN:
			fputs("ifgsn", stdout);
			break;
#endif
#ifdef IFT_DVBRCCMACLAYER
		case IFT_DVBRCCMACLAYER:
			fputs("dvbrccmaclayer", stdout);
			break;
#endif
#ifdef IFT_DVBRCCDOWNSTREAM
		case IFT_DVBRCCDOWNSTREAM:
			fputs("dvbrccdownstream", stdout);
			break;
#endif
#ifdef IFT_DVBRCCUPSTREAM
		case IFT_DVBRCCUPSTREAM:
			fputs("dvbrccupstream", stdout);
			break;
#endif
#ifdef IFT_ATMVIRTUAL
		case IFT_ATMVIRTUAL:
			fputs("atmvirtual", stdout);
			break;
#endif
#ifdef IFT_MPLSTUNNEL
		case IFT_MPLSTUNNEL:
			fputs("mplstunnel", stdout);
			break;
#endif
#ifdef IFT_SRP
		case IFT_SRP:
			fputs("srp", stdout);
			break;
#endif
#ifdef IFT_VOICEOVERATM
		case IFT_VOICEOVERATM:
			fputs("voiceoveratm", stdout);
			break;
#endif
#ifdef IFT_VOICEOVERFRAMERELAY
		case IFT_VOICEOVERFRAMERELAY:
			fputs("voiceoverframerelay", stdout);
			break;
#endif
#ifdef IFT_IDSL
		case IFT_IDSL:
			fputs("idsl", stdout);
			break;
#endif
#ifdef IFT_COMPOSITELINK
		case IFT_COMPOSITELINK:
			fputs("compositelink", stdout);
			break;
#endif
#ifdef IFT_SS7SIGLINK
		case IFT_SS7SIGLINK:
			fputs("ss7siglink", stdout);
			break;
#endif
#ifdef IFT_PROPWIRELESSP2P
		case IFT_PROPWIRELESSP2P:
			fputs("propwirelessp2p", stdout);
			break;
#endif
#ifdef IFT_FRFORWARD
		case IFT_FRFORWARD:
			fputs("frforward", stdout);
			break;
#endif
#ifdef IFT_RFC1483
		case IFT_RFC1483:
			fputs("rfc1483", stdout);
			break;
#endif
#ifdef IFT_USB
		case IFT_USB:
			fputs("usb", stdout);
			break;
#endif
#ifdef IFT_IEEE8023ADLAG
		case IFT_IEEE8023ADLAG:
			fputs("ieee8023adlag", stdout);
			break;
#endif
#ifdef IFT_BGPPOLICYACCOUNTING
		case IFT_BGPPOLICYACCOUNTING:
			fputs("bgppolicyaccounting", stdout);
			break;
#endif
#ifdef IFT_FRF16MFRBUNDLE
		case IFT_FRF16MFRBUNDLE:
			fputs("frf16mfrbundle", stdout);
			break;
#endif
#ifdef IFT_H323GATEKEEPER
		case IFT_H323GATEKEEPER:
			fputs("h323gatekeeper", stdout);
			break;
#endif
#ifdef IFT_H323PROXY
		case IFT_H323PROXY:
			fputs("h323proxy", stdout);
			break;
#endif
#ifdef IFT_MPLS
		case IFT_MPLS:
			fputs("mpls", stdout);
			break;
#endif
#ifdef IFT_MFSIGLINK
		case IFT_MFSIGLINK:
			fputs("mfsiglink", stdout);
			break;
#endif
#ifdef IFT_HDSL2
		case IFT_HDSL2:
			fputs("hdsl2", stdout);
			break;
#endif
#ifdef IFT_SHDSL
		case IFT_SHDSL:
			fputs("shdsl", stdout);
			break;
#endif
#ifdef IFT_DS1FDL
		case IFT_DS1FDL:
			fputs("ds1fdl", stdout);
			break;
#endif
#ifdef IFT_POS
		case IFT_POS:
			fputs("pos", stdout);
			break;
#endif
#ifdef IFT_DVBASILN
		case IFT_DVBASILN:
			fputs("dvbasiln", stdout);
			break;
#endif
#ifdef IFT_DVBASIOUT
		case IFT_DVBASIOUT:
			fputs("dvbasiout", stdout);
			break;
#endif
#ifdef IFT_PLC
		case IFT_PLC:
			fputs("plc", stdout);
			break;
#endif
#ifdef IFT_NFAS
		case IFT_NFAS:
			fputs("nfas", stdout);
			break;
#endif
#ifdef IFT_TR008
		case IFT_TR008:
			fputs("tr008", stdout);
			break;
#endif
#ifdef IFT_GR303RDT
		case IFT_GR303RDT:
			fputs("gr303rdt", stdout);
			break;
#endif
#ifdef IFT_GR303IDT
		case IFT_GR303IDT:
			fputs("gr303idt", stdout);
			break;
#endif
#ifdef IFT_ISUP
		case IFT_ISUP:
			fputs("isup", stdout);
			break;
#endif
#ifdef IFT_PROPDOCSWIRELESSMACLAYER
		case IFT_PROPDOCSWIRELESSMACLAYER:
			fputs("propdocswirelessmaclayer", stdout);
			break;
#endif
#ifdef IFT_PROPDOCSWIRELESSDOWNSTREAM
		case IFT_PROPDOCSWIRELESSDOWNSTREAM:
			fputs("propdocswirelessdownstream", stdout);
			break;
#endif
#ifdef IFT_PROPDOCSWIRELESSUPSTREAM
		case IFT_PROPDOCSWIRELESSUPSTREAM:
			fputs("propdocswirelessupstream", stdout);
			break;
#endif
#ifdef IFT_HIPERLAN2
		case IFT_HIPERLAN2:
			fputs("hiperlan2", stdout);
			break;
#endif
#ifdef IFT_PROPBWAP2MP
		case IFT_PROPBWAP2MP:
			fputs("propbwap2mp", stdout);
			break;
#endif
#ifdef IFT_SONETOVERHEADCHANNEL
		case IFT_SONETOVERHEADCHANNEL:
			fputs("sonetoverheadchannel", stdout);
			break;
#endif
#ifdef IFT_DIGITALWRAPPEROVERHEADCHANNEL
		case IFT_DIGITALWRAPPEROVERHEADCHANNEL:
			fputs("digitalwrapperoverheadchannel", stdout);
			break;
#endif
#ifdef IFT_AAL2
		case IFT_AAL2:
			fputs("aal2", stdout);
			break;
#endif
#ifdef IFT_RADIOMAC
		case IFT_RADIOMAC:
			fputs("radiomac", stdout);
			break;
#endif
#ifdef IFT_ATMRADIO
		case IFT_ATMRADIO:
			fputs("atmradio", stdout);
			break;
#endif
#ifdef IFT_IMT
		case IFT_IMT:
			fputs("imt", stdout);
			break;
#endif
#ifdef IFT_MVL
		case IFT_MVL:
			fputs("mvl", stdout);
			break;
#endif
#ifdef IFT_REACHDSL
		case IFT_REACHDSL:
			fputs("reachdsl", stdout);
			break;
#endif
#ifdef IFT_FRDLCIENDPT
		case IFT_FRDLCIENDPT:
			fputs("frdlciendpt", stdout);
			break;
#endif
#ifdef IFT_ATMVCIENDPT
		case IFT_ATMVCIENDPT:
			fputs("atmvciendpt", stdout);
			break;
#endif
#ifdef IFT_OPTICALCHANNEL
		case IFT_OPTICALCHANNEL:
			fputs("opticalchannel", stdout);
			break;
#endif
#ifdef IFT_OPTICALTRANSPORT
		case IFT_OPTICALTRANSPORT:
			fputs("opticaltransport", stdout);
			break;
#endif
#ifdef IFT_INFINIBAND
		case IFT_INFINIBAND:
			fputs("infiniband", stdout);
			break;
#endif
#ifdef IFT_BRIDGE
		case IFT_BRIDGE:
			fputs("bridge", stdout);
			break;
#endif
#ifdef IFT_STF
		case IFT_STF:
			fputs("stf", stdout);
			break;
#endif
		default:
			fputs("unknown", stdout);
			break;
	}
	if(sdl->sdl_alen) {
		putchar(' ');
		const char *p = sdl->sdl_data + sdl->sdl_nlen;
		unsigned int i = 0;
		do {
			if(i) putchar(':');
			printf("%02hhx", p[i]);
		} while(++i < sdl->sdl_alen);
	}
	putchar('\n');
}

static long int human_readable_binary(unsigned long int n, int *unit, unsigned int scale) {
	if(!unit) return -1;
	if(scale < 1) return -1;
	switch(*unit) {
		case 0:
			if(n < 1024 * scale) return n;
			n /= 1024;
			*unit = 'K';
		case 'K':
			if(n < 1024 * scale) return n;
			n /= 1024;
			*unit = 'M';
		case 'M':
			if(n < 1024 * scale) return n;
			n /= 1024;
			*unit = 'G';
		case 'G':
			if(n < 1024 * scale) return n;
			n /= 1024;
			*unit = 'T';
		case 'T':
			if(n < 1024 * scale) return n;
			n /= 1024;
			*unit = 'P';
			return n;
		default:
			return -1;
	}
}

static void print_human_readable_binary_value(unsigned long int value) {
	unsigned int scale = 10;
	unsigned long int n = value * 10;
	if(n < value) {
		scale = 1;
		n = value;
	}
	int unit_prefix = 0;
	n = human_readable_binary(n, &unit_prefix, scale);
	if(scale == 1) printf("%lu ", n);
	else printf("%lu.%u ", n / 10, (unsigned int)(n % 10));
	if(unit_prefix) printf("%ci", unit_prefix);
}

static void print_statistics(const struct if_data *data) {
	printf("	RX packets %lu bytes %lu (",
		(unsigned long int)data->ifi_ipackets, (unsigned long int)data->ifi_ibytes);
	print_human_readable_binary_value(data->ifi_ibytes);
	fputs("B)\n", stdout);
	printf("	RX errors %lu dropped %lu\n",
		(unsigned long int)data->ifi_ierrors, (unsigned long int)data->ifi_iqdrops);
	printf("	TX packets %lu bytes %lu (",
		(unsigned long int)data->ifi_opackets, (unsigned long int)data->ifi_obytes);
	print_human_readable_binary_value(data->ifi_obytes);
	fputs("B)\n", stdout);
	printf("	TX errors %lu", (unsigned long int)data->ifi_oerrors);
#ifdef _IFI_OQDROPS
	printf(" dropped %lu", (unsigned long int)data->ifi_oqdrops);
#endif
	printf(" collisions %lu\n", (unsigned long int)data->ifi_collisions);
}

static int print_config(const char *interface) {
	int mib[] = {CTL_NET, PF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
	size_t len;
	if(sysctl(mib, sizeof mib / sizeof(int), NULL, &len, NULL, 0) < 0) return -1;
	char buffer[len];
	if(sysctl(mib, sizeof mib / sizeof(int), buffer, &len, NULL, 0) < 0) return -1;
	int i = 0;
	struct if_msghdr *ifm;
	while(i < len) {
		ifm = (struct if_msghdr *)(buffer + i);
		if(ifm->ifm_type == RTM_IFINFO) {
/*
			printf("ifm_data.ifi_type = %hhu, ifm_data.ifi_physical = %hhu, ifm_data.ifi_addrlen = %hhu, ifm_data.ifi_link_state = %hhu, ifm_data.ifi_datalen = %hhu, ifm_data.ifi_mtu = %lu, ifm_data.ifi_metric = %lu, ifm_data.ifi_baudrate = %lu, ifm_data.ifi_ipackets = %lu, ifm_data.ifi_ierrors = %lu, ifm_data.ifi_opackets = %lu, ifm_data.ifi_oerrors = %lu, ifm_data.ifi_collisions = %lu, ifm_data.ifi_ibytes = %lu, ifm_data.ifi_obytes = %lu, ifm_data.ifi_imcasts = %lu, ifm_data.ifi_omcasts = %lu, ifm_data.ifi_iqdrops = %lu, ifm_data.ifi_noproto = %lu, ifm_data.ifi_hwassist = 0x%llx, ifm_data.ifi_epoch = %llu\n",
				ifm->ifm_data.ifi_type,
				ifm->ifm_data.ifi_physical,
				ifm->ifm_data.ifi_addrlen,
				ifm->ifm_data.ifi_link_state,
				ifm->ifm_data.ifi_datalen,
				ifm->ifm_data.ifi_mtu,
				ifm->ifm_data.ifi_metric,
				ifm->ifm_data.ifi_baudrate,
				ifm->ifm_data.ifi_ipackets,
				ifm->ifm_data.ifi_ierrors,
				ifm->ifm_data.ifi_opackets,
				ifm->ifm_data.ifi_oerrors,
				ifm->ifm_data.ifi_collisions,
				ifm->ifm_data.ifi_ibytes,
				ifm->ifm_data.ifi_obytes,
				ifm->ifm_data.ifi_imcasts,
				ifm->ifm_data.ifi_omcasts,
				ifm->ifm_data.ifi_iqdrops,
				ifm->ifm_data.ifi_noproto,
				(unsigned long long int)ifm->ifm_data.ifi_hwassist,
				(unsigned long long int)ifm->ifm_data.ifi_epoch);
*/
			if(ifm->ifm_msglen - sizeof(struct if_msghdr) >= sizeof(struct sockaddr_dl)) {
				struct sockaddr_dl *sdl = (struct sockaddr_dl *)(ifm + 1);
				if(sdl->sdl_family == AF_LINK) {
/*
					printf("sdl_type = %hhu, sdl_nlen = %hhu, sdl_alen = %hhu, sdl_slen = %hhu, interface name: ",
						sdl->sdl_type,
						sdl->sdl_nlen,
						sdl->sdl_alen,
						sdl->sdl_slen);
*/
					char name[sdl->sdl_nlen + 1];
					memcpy(name, sdl->sdl_data, sdl->sdl_nlen);
					name[sdl->sdl_nlen] = 0;
//					puts(name);

					if(!interface || strcmp(interface, name) == 0) {
						printf("%s: flags=%x<", name, ifm->ifm_flags);
						print_interface_flags(ifm->ifm_flags);
						printf("> metric %lu mtu %lu index %hu\n",
							(unsigned long int)ifm->ifm_data.ifi_metric,
							(unsigned long int)ifm->ifm_data.ifi_mtu, ifm->ifm_index);
						print_datalink_name_and_address(sdl);
						print_statistics(&ifm->ifm_data);
						if(interface) return 0;
					}
				}
			}
		}
		i += ifm->ifm_msglen;
	}
	if(interface) {
		fprintf(stderr, "ifconfig: interface %s doesn't exist\n", interface);
		return -1;
	}
	return 0;
}

int main(int argc, char **argv) {
	int print_all = 0;
	char **v = argv + 1;
	while(*v && **v == '-') {
		const char *o = *v++ + 1;
		if(o[0] == '-' && !o[1]) break;
		switch(*o) {
			case 'a':
				print_all = 1;
				break;
			case 'h':
				print_usage(argv[0]);
				return 0;
			default:
				fprintf(stderr, "%s: Unknown option '-%c'\n", argv[0], *o);
				return -1;
		}
	}

	if(!print_all) {
		if(!*v) {
			print_usage(argv[0]);
			return -1;
		}
		if(v[1]) {
			fprintf(stderr, "%s: Changing configuration is not supported\n", argv[0]);
			return 1;
		}
	}
	return print_config(print_all ? NULL : *v) == 0 ? 0 : 1;
}