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/*
* wavemon - a wireless network monitoring aplication
*
* Copyright (c) 2001-2002 Jan Morgenstern <jan@jm-music.de>
*
* wavemon is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2, or (at your option) any later
* version.
*
* wavemon 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 wavemon; see the file COPYING. If not, write to the Free Software
* Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "iw_if.h"
/* Determine the artificial spreading of random samples (best: 1..10) */
#define WAVE_RAND_SPREAD 1
/* Fallback maximum quality level when using random samples. */
#define WAVE_RAND_QUAL_MAX 100
/*
* Obtain network device information
*/
static int if_get_flags(int skfd, const char *ifname)
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(struct ifreq));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
err_sys("can not get interface flags for %s", ifname);
return ifr.ifr_flags;
}
/* Return true if @ifname is known to be up. */
bool if_is_up(const char *ifname)
{
int ret, skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
ret = if_get_flags(skfd, ifname) & IFF_UP;
close(skfd);
return ret;
}
/** Change the up/down state of @ifname according to @up. */
static int if_set_up_or_down(const char *ifname, bool up)
{
struct ifreq ifr;
int ret, skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
ifr.ifr_flags = if_get_flags(skfd, ifname);
if (up) {
ifr.ifr_flags |= IFF_UP;
} else {
ifr.ifr_flags &= ~IFF_UP;
}
ret = ioctl(skfd, SIOCSIFFLAGS, &ifr);
close(skfd);
return ret;
}
/** Bring @ifname up. */
int if_set_up(const char *ifname)
{
return if_set_up_or_down(ifname, true);
}
/** Set @ifname down. */
int if_set_down(const char *ifname)
{
return if_set_up_or_down(ifname, false);
}
/** Exit handler to restore interface 'down' state on exit via atexit(3). */
void if_set_down_on_exit(void)
{
const char *ifname = conf_ifname();
if (ifname && if_set_down(ifname) < 0) {
err_msg("unable to restore %s interface state - set down manually", ifname);
}
}
/* Interface information */
void if_getinf(const char *ifname, struct if_info *info)
{
struct ifreq ifr;
int skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
memset(&ifr, 0, sizeof(struct ifreq));
memset(info, 0, sizeof(struct if_info));
info->flags = if_get_flags(skfd, ifname);
strncpy(ifr.ifr_name, ifname, IFNAMSIZ-1);
if (ioctl(skfd, SIOCGIFMTU, &ifr) == 0)
info->mtu = ifr.ifr_mtu;
if (ioctl(skfd, SIOCGIFTXQLEN, &ifr) >= 0)
info->txqlen = ifr.ifr_qlen;
/* Copy the 6 byte Ethernet address and the 4 byte struct in_addrs */
if (ioctl(skfd, SIOCGIFHWADDR, &ifr) >= 0)
memcpy(&info->hwaddr, &ifr.ifr_hwaddr.sa_data, 6);
if (ioctl(skfd, SIOCGIFADDR, &ifr) >= 0)
memcpy(&info->addr, &ifr.ifr_addr.sa_data[2], 4);
if (ioctl(skfd, SIOCGIFNETMASK, &ifr) >= 0)
memcpy(&info->netmask, &ifr.ifr_netmask.sa_data[2], 4);
if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) >= 0)
memcpy(&info->bcast, &ifr.ifr_broadaddr.sa_data[2], 4);
close(skfd);
}
/**
* iw_get_interface_list - fill if_list with NULL-terminated array of WiFi
* interfaces.
* Use the safe route of checking /proc/net/dev/ for wireless interfaces:
* - SIOCGIFCONF only returns running interfaces that have an IP address;
* - /proc/net/wireless may exist, but may not list all wireless interfaces.
*/
void iw_get_interface_list(char** if_list, size_t max_entries)
{
char *p, tmp[BUFSIZ];
int nifs = 1; /* if_list[nifs-1] = NULL */
struct iwreq wrq;
FILE *fp;
int skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
fp = fopen("/proc/net/dev", "r");
if (fp == NULL)
err_sys("can not open /proc/net/dev");
while (fgets(tmp, sizeof(tmp), fp)) {
if ((p = strchr(tmp, ':'))) {
for (*p = '\0', p = tmp; isspace(*p); )
p++;
/*
* Use SIOCGIWNAME as indicator: if interface does not
* support this ioctl, it has no wireless extensions.
*/
snprintf(wrq.ifr_name, IFNAMSIZ, "%s", p);
if (ioctl(skfd, SIOCGIWNAME, &wrq) < 0)
continue;
if(nifs >= max_entries) break;
if_list[nifs-1] = strdup(p);
if_list[nifs++] = NULL;
}
}
close(skfd);
fclose(fp);
}
/**
* iw_dyn_info_get - populate dynamic information
* @info: information to populate
* @ifname: interface name
* @if: range information to use (number of encryption keys)
*/
void dyn_info_get(struct iw_dyn_info *info, const char *ifname)
{
struct iwreq iwr;
int skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
memset(info, 0, sizeof(*info));
strncpy(iwr.ifr_name, ifname, IFNAMSIZ-1);
if (ioctl(skfd, SIOCGIWNAME, &iwr) < 0)
err_sys("can not open device '%s'", ifname);
strncpy(info->name, iwr.u.name, IFNAMSIZ);
iwr.u.essid.pointer = (caddr_t) info->essid;
iwr.u.essid.length = sizeof(info->essid);
iwr.u.essid.flags = 0;
if (ioctl(skfd, SIOCGIWESSID, &iwr) >= 0) {
info->cap_essid = 1;
/* Convert potential ESSID index to count > 0 */
info->essid_ct = iwr.u.essid.flags & IW_ENCODE_INDEX ? : 1;
info->essid[iwr.u.essid.length] = '\0';
}
iwr.u.essid.pointer = (caddr_t) info->nickname;
iwr.u.essid.length = sizeof(info->nickname);
iwr.u.essid.flags = 0;
if (ioctl(skfd, SIOCGIWNICKN, &iwr) >= 0 &&
iwr.u.data.length > 1)
info->cap_nickname = 1;
if (ioctl(skfd, SIOCGIWFREQ, &iwr) >= 0) {
info->cap_freq = 1;
info->freq = freq_to_hz(&iwr.u.freq);
}
if (ioctl(skfd, SIOCGIWSENS, &iwr) >= 0) {
info->cap_sens = 1;
info->sens = iwr.u.sens.value;
}
if (ioctl(skfd, SIOCGIWRATE, &iwr) >= 0)
info->bitrate = iwr.u.bitrate.value;
if (ioctl(skfd, SIOCGIWTXPOW, &iwr) >= 0) {
info->cap_txpower = 1;
memcpy(&info->txpower, &iwr.u.txpower, sizeof(info->txpower));
}
if (ioctl(skfd, SIOCGIWPOWER, &iwr) >= 0) {
info->cap_power = 1;
memcpy(&info->power, &iwr.u.power, sizeof(info->power));
}
if (ioctl(skfd, SIOCGIWRETRY, &iwr) >= 0) {
info->cap_retry = 1;
memcpy(&info->retry, &iwr.u.retry, sizeof(info->retry));
}
if (ioctl(skfd, SIOCGIWRTS, &iwr) >= 0) {
info->cap_rts = 1;
memcpy(&info->rts, &iwr.u.rts, sizeof(info->rts));
}
if (ioctl(skfd, SIOCGIWFRAG, &iwr) >= 0) {
info->cap_frag = 1;
memcpy(&info->frag, &iwr.u.frag, sizeof(info->frag));
}
if (ioctl(skfd, SIOCGIWMODE, &iwr) >= 0) {
info->cap_mode = 1;
info->mode = iwr.u.mode;
}
if (ioctl(skfd, SIOCGIWAP, &iwr) >= 0) {
info->cap_ap = 1;
memcpy(&info->ap_addr, &iwr.u.ap_addr, sizeof(struct sockaddr));
}
close(skfd);
}
/*
* Request range information for a given wireless interface.
* @ifname: name of the wireless argument
* @range: storage location to populate with range information.
*/
void iw_getinf_range(const char *ifname, struct iw_range *range)
{
struct iwreq iwr;
int skfd = socket(AF_INET, SOCK_DGRAM, 0);
if (skfd < 0)
err_sys("%s: can not open socket", __func__);
memset(range, 0, sizeof(struct iw_range));
strncpy(iwr.ifr_name, ifname, IFNAMSIZ-1);
iwr.u.data.pointer = (caddr_t) range;
iwr.u.data.length = sizeof(struct iw_range);
iwr.u.data.flags = 0;
if (ioctl(skfd, SIOCGIWRANGE, &iwr) < 0)
err_sys("can not get range information");
close(skfd);
}
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