iwinfo: move wext_ops to iwinfo_wext.c, make functions static

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 40810
This commit is contained in:
Felix Fietkau 2014-05-21 12:33:15 +00:00
parent 2d06acd6ac
commit 6e27ecbac7
10 changed files with 146 additions and 173 deletions

View file

@ -183,7 +183,7 @@ const char * iwinfo_type(const char *ifname);
const struct iwinfo_ops * iwinfo_backend(const char *ifname);
void iwinfo_finish(void);
#include "iwinfo/wext.h"
extern const struct iwinfo_ops wext_ops;
#ifdef USE_WL
#include "iwinfo/wl.h"

View file

@ -24,7 +24,6 @@
#include <lauxlib.h>
#include "iwinfo.h"
#include "iwinfo/wext_scan.h"
#define IWINFO_META "iwinfo"
@ -58,6 +57,18 @@
return 1; \
}
#define LUA_WRAP_INT_OP(type,op) \
static int iwinfo_L_##type##_##op(lua_State *L) \
{ \
const char *ifname = luaL_checkstring(L, 1); \
int rv; \
if( !type##_ops.op(ifname, &rv) ) \
lua_pushnumber(L, rv); \
else \
lua_pushnil(L); \
return 1; \
}
#define LUA_WRAP_STRING(type,op) \
static int iwinfo_L_##type##_##op(lua_State *L) \
{ \
@ -71,10 +82,29 @@
return 1; \
}
#define LUA_WRAP_STRING_OP(type,op) \
static int iwinfo_L_##type##_##op(lua_State *L) \
{ \
const char *ifname = luaL_checkstring(L, 1); \
char rv[IWINFO_BUFSIZE]; \
memset(rv, 0, IWINFO_BUFSIZE); \
if( !type##_ops.op(ifname, rv) ) \
lua_pushstring(L, rv); \
else \
lua_pushnil(L); \
return 1; \
}
#define LUA_WRAP_STRUCT(type,op) \
static int iwinfo_L_##type##_##op(lua_State *L) \
{ \
return iwinfo_L_##op(L, type##_get_##op); \
}
#define LUA_WRAP_STRUCT_OP(type,op) \
static int iwinfo_L_##type##_##op(lua_State *L) \
{ \
return iwinfo_L_##op(L, type##_ops.op); \
}
#endif

View file

@ -1,88 +0,0 @@
/*
* iwinfo - Wireless Information Library - Linux Wireless Extension Headers
*
* Copyright (C) 2009-2010 Jo-Philipp Wich <xm@subsignal.org>
*
* The iwinfo library is free software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* The iwinfo library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the iwinfo library. If not, see http://www.gnu.org/licenses/.
*/
#ifndef __IWINFO_WEXT_H_
#define __IWINFO_WEXT_H_
#include <fcntl.h>
#include "iwinfo.h"
#include "iwinfo/utils.h"
#include "iwinfo/api/wext.h"
int wext_probe(const char *ifname);
int wext_get_mode(const char *ifname, int *buf);
int wext_get_ssid(const char *ifname, char *buf);
int wext_get_bssid(const char *ifname, char *buf);
int wext_get_country(const char *ifname, char *buf);
int wext_get_channel(const char *ifname, int *buf);
int wext_get_frequency(const char *ifname, int *buf);
int wext_get_frequency_offset(const char *ifname, int *buf);
int wext_get_txpower(const char *ifname, int *buf);
int wext_get_txpower_offset(const char *ifname, int *buf);
int wext_get_bitrate(const char *ifname, int *buf);
int wext_get_signal(const char *ifname, int *buf);
int wext_get_noise(const char *ifname, int *buf);
int wext_get_quality(const char *ifname, int *buf);
int wext_get_quality_max(const char *ifname, int *buf);
int wext_get_encryption(const char *ifname, char *buf);
int wext_get_phyname(const char *ifname, char *buf);
int wext_get_assoclist(const char *ifname, char *buf, int *len);
int wext_get_txpwrlist(const char *ifname, char *buf, int *len);
int wext_get_scanlist(const char *ifname, char *buf, int *len);
int wext_get_freqlist(const char *ifname, char *buf, int *len);
int wext_get_countrylist(const char *ifname, char *buf, int *len);
int wext_get_hwmodelist(const char *ifname, int *buf);
int wext_get_mbssid_support(const char *ifname, int *buf);
int wext_get_hardware_id(const char *ifname, char *buf);
int wext_get_hardware_name(const char *ifname, char *buf);
void wext_close(void);
static const struct iwinfo_ops wext_ops = {
.name = "wext",
.probe = wext_probe,
.channel = wext_get_channel,
.frequency = wext_get_frequency,
.frequency_offset = wext_get_frequency_offset,
.txpower = wext_get_txpower,
.txpower_offset = wext_get_txpower_offset,
.bitrate = wext_get_bitrate,
.signal = wext_get_signal,
.noise = wext_get_noise,
.quality = wext_get_quality,
.quality_max = wext_get_quality_max,
.mbssid_support = wext_get_mbssid_support,
.hwmodelist = wext_get_hwmodelist,
.mode = wext_get_mode,
.ssid = wext_get_ssid,
.bssid = wext_get_bssid,
.country = wext_get_country,
.hardware_id = wext_get_hardware_id,
.hardware_name = wext_get_hardware_name,
.encryption = wext_get_encryption,
.phyname = wext_get_phyname,
.assoclist = wext_get_assoclist,
.txpwrlist = wext_get_txpwrlist,
.scanlist = wext_get_scanlist,
.freqlist = wext_get_freqlist,
.countrylist = wext_get_countrylist,
.close = wext_close
};
#endif

View file

@ -697,31 +697,31 @@ LUA_WRAP_STRUCT(nl80211,hardware_id)
#endif
/* Wext */
LUA_WRAP_INT(wext,channel)
LUA_WRAP_INT(wext,frequency)
LUA_WRAP_INT(wext,frequency_offset)
LUA_WRAP_INT(wext,txpower)
LUA_WRAP_INT(wext,txpower_offset)
LUA_WRAP_INT(wext,bitrate)
LUA_WRAP_INT(wext,signal)
LUA_WRAP_INT(wext,noise)
LUA_WRAP_INT(wext,quality)
LUA_WRAP_INT(wext,quality_max)
LUA_WRAP_STRING(wext,ssid)
LUA_WRAP_STRING(wext,bssid)
LUA_WRAP_STRING(wext,country)
LUA_WRAP_STRING(wext,hardware_name)
LUA_WRAP_STRING(wext,phyname)
LUA_WRAP_STRUCT(wext,mode)
LUA_WRAP_STRUCT(wext,assoclist)
LUA_WRAP_STRUCT(wext,txpwrlist)
LUA_WRAP_STRUCT(wext,scanlist)
LUA_WRAP_STRUCT(wext,freqlist)
LUA_WRAP_STRUCT(wext,countrylist)
LUA_WRAP_STRUCT(wext,hwmodelist)
LUA_WRAP_STRUCT(wext,encryption)
LUA_WRAP_STRUCT(wext,mbssid_support)
LUA_WRAP_STRUCT(wext,hardware_id)
LUA_WRAP_INT_OP(wext,channel)
LUA_WRAP_INT_OP(wext,frequency)
LUA_WRAP_INT_OP(wext,frequency_offset)
LUA_WRAP_INT_OP(wext,txpower)
LUA_WRAP_INT_OP(wext,txpower_offset)
LUA_WRAP_INT_OP(wext,bitrate)
LUA_WRAP_INT_OP(wext,signal)
LUA_WRAP_INT_OP(wext,noise)
LUA_WRAP_INT_OP(wext,quality)
LUA_WRAP_INT_OP(wext,quality_max)
LUA_WRAP_STRING_OP(wext,ssid)
LUA_WRAP_STRING_OP(wext,bssid)
LUA_WRAP_STRING_OP(wext,country)
LUA_WRAP_STRING_OP(wext,hardware_name)
LUA_WRAP_STRING_OP(wext,phyname)
LUA_WRAP_STRUCT_OP(wext,mode)
LUA_WRAP_STRUCT_OP(wext,assoclist)
LUA_WRAP_STRUCT_OP(wext,txpwrlist)
LUA_WRAP_STRUCT_OP(wext,scanlist)
LUA_WRAP_STRUCT_OP(wext,freqlist)
LUA_WRAP_STRUCT_OP(wext,countrylist)
LUA_WRAP_STRUCT_OP(wext,hwmodelist)
LUA_WRAP_STRUCT_OP(wext,encryption)
LUA_WRAP_STRUCT_OP(wext,mbssid_support)
LUA_WRAP_STRUCT_OP(wext,hardware_id)
#ifdef USE_WL
/* Broadcom table */

View file

@ -21,7 +21,7 @@
*/
#include "iwinfo/madwifi.h"
#include "iwinfo/wext.h"
#include "iwinfo_wext.h"
/*
@ -349,17 +349,17 @@ void madwifi_close(void)
int madwifi_get_mode(const char *ifname, int *buf)
{
return wext_get_mode(ifname, buf);
return wext_ops.mode(ifname, buf);
}
int madwifi_get_ssid(const char *ifname, char *buf)
{
return wext_get_ssid(ifname, buf);
return wext_ops.ssid(ifname, buf);
}
int madwifi_get_bssid(const char *ifname, char *buf)
{
return wext_get_bssid(ifname, buf);
return wext_ops.bssid(ifname, buf);
}
int madwifi_get_channel(const char *ifname, int *buf)
@ -409,7 +409,7 @@ int madwifi_get_frequency(const char *ifname, int *buf)
int madwifi_get_txpower(const char *ifname, int *buf)
{
return wext_get_txpower(ifname, buf);
return wext_ops.txpower(ifname, buf);
}
int madwifi_get_bitrate(const char *ifname, int *buf)
@ -452,7 +452,7 @@ int madwifi_get_bitrate(const char *ifname, int *buf)
}
/* Return whatever wext tells us ... */
return wext_get_bitrate(ifname, buf);
return wext_ops.bitrate(ifname, buf);
}
return -1;
@ -498,7 +498,7 @@ int madwifi_get_signal(const char *ifname, int *buf)
}
/* Return whatever wext tells us ... */
return wext_get_signal(ifname, buf);
return wext_ops.signal(ifname, buf);
}
return -1;
@ -506,7 +506,7 @@ int madwifi_get_signal(const char *ifname, int *buf)
int madwifi_get_noise(const char *ifname, int *buf)
{
return wext_get_noise(ifname, buf);
return wext_ops.noise(ifname, buf);
}
int madwifi_get_quality(const char *ifname, int *buf)
@ -549,7 +549,7 @@ int madwifi_get_quality(const char *ifname, int *buf)
}
/* Return whatever wext tells us ... */
return wext_get_quality(ifname, buf);
return wext_ops.quality(ifname, buf);
}
return -1;
@ -557,7 +557,7 @@ int madwifi_get_quality(const char *ifname, int *buf)
int madwifi_get_quality_max(const char *ifname, int *buf)
{
return wext_get_quality_max(ifname, buf);
return wext_ops.quality_max(ifname, buf);
}
int madwifi_get_encryption(const char *ifname, char *buf)
@ -807,7 +807,7 @@ int madwifi_get_txpwrlist(const char *ifname, char *buf, int *len)
{
if( (res = madwifi_ifadd(ifname)) != NULL )
{
rc = wext_get_txpwrlist(res, buf, len);
rc = wext_ops.txpwrlist(res, buf, len);
madwifi_ifdel(res);
}
}
@ -815,7 +815,7 @@ int madwifi_get_txpwrlist(const char *ifname, char *buf, int *len)
/* Its an athX ... */
else if( !!madwifi_isvap(ifname, NULL) )
{
rc = wext_get_txpwrlist(ifname, buf, len);
rc = wext_ops.txpwrlist(ifname, buf, len);
}
return rc;
@ -841,7 +841,7 @@ int madwifi_get_scanlist(const char *ifname, char *buf, int *len)
{
if( iwinfo_ifup(e->d_name) )
{
ret = wext_get_scanlist(e->d_name, buf, len);
ret = wext_ops.scanlist(e->d_name, buf, len);
break;
}
}
@ -857,13 +857,13 @@ int madwifi_get_scanlist(const char *ifname, char *buf, int *len)
{
if( iwinfo_ifup(res) )
{
wext_get_scanlist(res, buf, len);
wext_ops.scanlist(res, buf, len);
sleep(1);
wext_get_scanlist(res, buf, len);
wext_ops.scanlist(res, buf, len);
sleep(1);
ret = wext_get_scanlist(res, buf, len);
ret = wext_ops.scanlist(res, buf, len);
}
iwinfo_ifdown(res);
@ -875,7 +875,7 @@ int madwifi_get_scanlist(const char *ifname, char *buf, int *len)
/* Got athX device? */
else if( !!madwifi_isvap(ifname, NULL) )
{
ret = wext_get_scanlist(ifname, buf, len);
ret = wext_ops.scanlist(ifname, buf, len);
}
return ret;
@ -1050,7 +1050,7 @@ int madwifi_get_hardware_id(const char *ifname, char *buf)
struct iwinfo_hardware_entry *e;
const char *phy = madwifi_phyname(ifname);
if (wext_get_hardware_id(phy, buf))
if (wext_ops.hardware_id(phy, buf))
return iwinfo_hardware_id_from_mtd((struct iwinfo_hardware_id *)buf);
return 0;

View file

@ -23,7 +23,6 @@
*/
#include "iwinfo/nl80211.h"
#include "iwinfo/wext.h"
#define min(x, y) ((x) < (y)) ? (x) : (y)
@ -1032,7 +1031,7 @@ int nl80211_get_txpower(const char *ifname, int *buf)
return 0;
#endif
return wext_get_txpower(ifname, buf);
return wext_ops.txpower(ifname, buf);
}
@ -2295,19 +2294,19 @@ int nl80211_get_hardware_id(const char *ifname, char *buf)
/* Reuse existing interface */
if ((res = nl80211_phy2ifname(ifname)) != NULL)
{
rv = wext_get_hardware_id(res, buf);
rv = wext_ops.hardware_id(res, buf);
}
/* Need to spawn a temporary iface for finding IDs */
else if ((res = nl80211_ifadd(ifname)) != NULL)
{
rv = wext_get_hardware_id(res, buf);
rv = wext_ops.hardware_id(res, buf);
nl80211_ifdel(res);
}
}
else
{
rv = wext_get_hardware_id(ifname, buf);
rv = wext_ops.hardware_id(ifname, buf);
}
/* Failed to obtain hardware IDs, search board config */

View file

@ -20,7 +20,7 @@
*/
#include "iwinfo.h"
#include "iwinfo/wext.h"
#include "iwinfo_wext.h"
static double wext_freq2float(const struct iw_freq *in)
{
@ -55,7 +55,7 @@ static inline int wext_ioctl(const char *ifname, int cmd, struct iwreq *wrq)
}
int wext_probe(const char *ifname)
static int wext_probe(const char *ifname)
{
struct iwreq wrq;
@ -65,12 +65,12 @@ int wext_probe(const char *ifname)
return 0;
}
void wext_close(void)
static void wext_close(void)
{
/* Nop */
}
int wext_get_mode(const char *ifname, int *buf)
static int wext_get_mode(const char *ifname, int *buf)
{
struct iwreq wrq;
@ -105,7 +105,7 @@ int wext_get_mode(const char *ifname, int *buf)
return -1;
}
int wext_get_ssid(const char *ifname, char *buf)
static int wext_get_ssid(const char *ifname, char *buf)
{
struct iwreq wrq;
@ -119,7 +119,7 @@ int wext_get_ssid(const char *ifname, char *buf)
return -1;
}
int wext_get_bssid(const char *ifname, char *buf)
static int wext_get_bssid(const char *ifname, char *buf)
{
struct iwreq wrq;
@ -136,7 +136,7 @@ int wext_get_bssid(const char *ifname, char *buf)
return -1;
}
int wext_get_bitrate(const char *ifname, int *buf)
static int wext_get_bitrate(const char *ifname, int *buf)
{
struct iwreq wrq;
@ -149,7 +149,7 @@ int wext_get_bitrate(const char *ifname, int *buf)
return -1;
}
int wext_get_channel(const char *ifname, int *buf)
static int wext_get_channel(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_range range;
@ -187,7 +187,7 @@ int wext_get_channel(const char *ifname, int *buf)
return -1;
}
int wext_get_frequency(const char *ifname, int *buf)
static int wext_get_frequency(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_range range;
@ -225,7 +225,7 @@ int wext_get_frequency(const char *ifname, int *buf)
return -1;
}
int wext_get_txpower(const char *ifname, int *buf)
static int wext_get_txpower(const char *ifname, int *buf)
{
struct iwreq wrq;
@ -244,7 +244,7 @@ int wext_get_txpower(const char *ifname, int *buf)
return -1;
}
int wext_get_signal(const char *ifname, int *buf)
static int wext_get_signal(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_statistics stats;
@ -264,7 +264,7 @@ int wext_get_signal(const char *ifname, int *buf)
return -1;
}
int wext_get_noise(const char *ifname, int *buf)
static int wext_get_noise(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_statistics stats;
@ -284,7 +284,7 @@ int wext_get_noise(const char *ifname, int *buf)
return -1;
}
int wext_get_quality(const char *ifname, int *buf)
static int wext_get_quality(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_statistics stats;
@ -302,7 +302,7 @@ int wext_get_quality(const char *ifname, int *buf)
return -1;
}
int wext_get_quality_max(const char *ifname, int *buf)
static int wext_get_quality_max(const char *ifname, int *buf)
{
struct iwreq wrq;
struct iw_range range;
@ -320,13 +320,13 @@ int wext_get_quality_max(const char *ifname, int *buf)
return -1;
}
int wext_get_assoclist(const char *ifname, char *buf, int *len)
static int wext_get_assoclist(const char *ifname, char *buf, int *len)
{
/* Stub */
return -1;
}
int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
static int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
{
struct iwreq wrq;
struct iw_range range;
@ -367,7 +367,7 @@ int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
return -1;
}
int wext_get_freqlist(const char *ifname, char *buf, int *len)
static int wext_get_freqlist(const char *ifname, char *buf, int *len)
{
struct iwreq wrq;
struct iw_range range;
@ -399,19 +399,19 @@ int wext_get_freqlist(const char *ifname, char *buf, int *len)
return -1;
}
int wext_get_country(const char *ifname, char *buf)
static int wext_get_country(const char *ifname, char *buf)
{
sprintf(buf, "00");
return 0;
}
int wext_get_countrylist(const char *ifname, char *buf, int *len)
static int wext_get_countrylist(const char *ifname, char *buf, int *len)
{
/* Stub */
return -1;
}
int wext_get_hwmodelist(const char *ifname, int *buf)
static int wext_get_hwmodelist(const char *ifname, int *buf)
{
char chans[IWINFO_BUFSIZE] = { 0 };
struct iwinfo_freqlist_entry *e = NULL;
@ -440,20 +440,20 @@ int wext_get_hwmodelist(const char *ifname, int *buf)
return -1;
}
int wext_get_encryption(const char *ifname, char *buf)
static int wext_get_encryption(const char *ifname, char *buf)
{
/* No reliable crypto info in wext */
return -1;
}
int wext_get_phyname(const char *ifname, char *buf)
static int wext_get_phyname(const char *ifname, char *buf)
{
/* No suitable api in wext */
strcpy(buf, ifname);
return 0;
}
int wext_get_mbssid_support(const char *ifname, int *buf)
static int wext_get_mbssid_support(const char *ifname, int *buf)
{
/* No multi bssid support atm */
return -1;
@ -480,7 +480,7 @@ static char * wext_sysfs_ifname_file(const char *ifname, const char *path)
return rv;
}
int wext_get_hardware_id(const char *ifname, char *buf)
static int wext_get_hardware_id(const char *ifname, char *buf)
{
char *data;
struct iwinfo_hardware_id *id = (struct iwinfo_hardware_id *)buf;
@ -506,22 +506,53 @@ int wext_get_hardware_id(const char *ifname, char *buf)
return (id->vendor_id > 0 && id->device_id > 0) ? 0 : -1;
}
int wext_get_hardware_name(const char *ifname, char *buf)
static int wext_get_hardware_name(const char *ifname, char *buf)
{
sprintf(buf, "Generic WEXT");
return 0;
}
int wext_get_txpower_offset(const char *ifname, int *buf)
static int wext_get_txpower_offset(const char *ifname, int *buf)
{
/* Stub */
*buf = 0;
return -1;
}
int wext_get_frequency_offset(const char *ifname, int *buf)
static int wext_get_frequency_offset(const char *ifname, int *buf)
{
/* Stub */
*buf = 0;
return -1;
}
const struct iwinfo_ops wext_ops = {
.name = "wext",
.probe = wext_probe,
.channel = wext_get_channel,
.frequency = wext_get_frequency,
.frequency_offset = wext_get_frequency_offset,
.txpower = wext_get_txpower,
.txpower_offset = wext_get_txpower_offset,
.bitrate = wext_get_bitrate,
.signal = wext_get_signal,
.noise = wext_get_noise,
.quality = wext_get_quality,
.quality_max = wext_get_quality_max,
.mbssid_support = wext_get_mbssid_support,
.hwmodelist = wext_get_hwmodelist,
.mode = wext_get_mode,
.ssid = wext_get_ssid,
.bssid = wext_get_bssid,
.country = wext_get_country,
.hardware_id = wext_get_hardware_id,
.hardware_name = wext_get_hardware_name,
.encryption = wext_get_encryption,
.phyname = wext_get_phyname,
.assoclist = wext_get_assoclist,
.txpwrlist = wext_get_txpwrlist,
.scanlist = wext_get_scanlist,
.freqlist = wext_get_freqlist,
.countrylist = wext_get_countrylist,
.close = wext_close
};

View file

@ -377,4 +377,6 @@ static const unsigned int standard_event_num =
#define IW_IE_CYPHER_NUM 8
#define IW_IE_KEY_MGMT_NUM 3
int wext_get_scanlist(const char *ifname, char *buf, int *len);
#endif

View file

@ -20,7 +20,7 @@
*/
#include "iwinfo.h"
#include "iwinfo/wext_scan.h"
#include "iwinfo_wext.h"
static int wext_ioctl(const char *ifname, int cmd, struct iwreq *wrq)

View file

@ -19,7 +19,6 @@
*/
#include "iwinfo/wl.h"
#include "iwinfo/wext.h"
static int wl_ioctl(const char *name, int cmd, void *buf, int len)
{
@ -143,13 +142,13 @@ int wl_get_channel(const char *ifname, int *buf)
int wl_get_frequency(const char *ifname, int *buf)
{
return wext_get_frequency(ifname, buf);
return wext_ops.frequency(ifname, buf);
}
int wl_get_txpower(const char *ifname, int *buf)
{
/* WLC_GET_VAR "qtxpower" */
return wext_get_txpower(ifname, buf);
return wext_ops.txpower(ifname, buf);
}
int wl_get_bitrate(const char *ifname, int *buf)
@ -235,12 +234,12 @@ int wl_get_noise(const char *ifname, int *buf)
int wl_get_quality(const char *ifname, int *buf)
{
return wext_get_quality(ifname, buf);
return wext_ops.quality(ifname, buf);
}
int wl_get_quality_max(const char *ifname, int *buf)
{
return wext_get_quality_max(ifname, buf);
return wext_ops.quality_max(ifname, buf);
}
int wl_get_encryption(const char *ifname, char *buf)
@ -521,12 +520,12 @@ int wl_get_txpwrlist(const char *ifname, char *buf, int *len)
int wl_get_scanlist(const char *ifname, char *buf, int *len)
{
return wext_get_scanlist(ifname, buf, len);
return wext_ops.scanlist(ifname, buf, len);
}
int wl_get_freqlist(const char *ifname, char *buf, int *len)
{
return wext_get_freqlist(ifname, buf, len);
return wext_ops.freqlist(ifname, buf, len);
}
int wl_get_country(const char *ifname, char *buf)